Mon, 14 Feb 2011 14:36:29 -0800
Merge
1 /*
2 * Copyright (c) 1997, 2011, 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 */
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 "interpreter/interpreter.hpp"
33 #include "jvm_solaris.h"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/filemap.hpp"
36 #include "mutex_solaris.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "os_share_solaris.hpp"
39 #include "prims/jniFastGetField.hpp"
40 #include "prims/jvm.h"
41 #include "prims/jvm_misc.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/extendedPC.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/interfaceSupport.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/mutexLocker.hpp"
49 #include "runtime/objectMonitor.hpp"
50 #include "runtime/osThread.hpp"
51 #include "runtime/perfMemory.hpp"
52 #include "runtime/sharedRuntime.hpp"
53 #include "runtime/statSampler.hpp"
54 #include "runtime/stubRoutines.hpp"
55 #include "runtime/threadCritical.hpp"
56 #include "runtime/timer.hpp"
57 #include "services/attachListener.hpp"
58 #include "services/runtimeService.hpp"
59 #include "thread_solaris.inline.hpp"
60 #include "utilities/decoder.hpp"
61 #include "utilities/defaultStream.hpp"
62 #include "utilities/events.hpp"
63 #include "utilities/growableArray.hpp"
64 #include "utilities/vmError.hpp"
65 #ifdef TARGET_ARCH_x86
66 # include "assembler_x86.inline.hpp"
67 # include "nativeInst_x86.hpp"
68 #endif
69 #ifdef TARGET_ARCH_sparc
70 # include "assembler_sparc.inline.hpp"
71 # include "nativeInst_sparc.hpp"
72 #endif
73 #ifdef COMPILER1
74 #include "c1/c1_Runtime1.hpp"
75 #endif
76 #ifdef COMPILER2
77 #include "opto/runtime.hpp"
78 #endif
80 // put OS-includes here
81 # include <dlfcn.h>
82 # include <errno.h>
83 # include <exception>
84 # include <link.h>
85 # include <poll.h>
86 # include <pthread.h>
87 # include <pwd.h>
88 # include <schedctl.h>
89 # include <setjmp.h>
90 # include <signal.h>
91 # include <stdio.h>
92 # include <alloca.h>
93 # include <sys/filio.h>
94 # include <sys/ipc.h>
95 # include <sys/lwp.h>
96 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
97 # include <sys/mman.h>
98 # include <sys/processor.h>
99 # include <sys/procset.h>
100 # include <sys/pset.h>
101 # include <sys/resource.h>
102 # include <sys/shm.h>
103 # include <sys/socket.h>
104 # include <sys/stat.h>
105 # include <sys/systeminfo.h>
106 # include <sys/time.h>
107 # include <sys/times.h>
108 # include <sys/types.h>
109 # include <sys/wait.h>
110 # include <sys/utsname.h>
111 # include <thread.h>
112 # include <unistd.h>
113 # include <sys/priocntl.h>
114 # include <sys/rtpriocntl.h>
115 # include <sys/tspriocntl.h>
116 # include <sys/iapriocntl.h>
117 # include <sys/loadavg.h>
118 # include <string.h>
119 # include <stdio.h>
121 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
122 # include <sys/procfs.h> // see comment in <sys/procfs.h>
124 #define MAX_PATH (2 * K)
126 // for timer info max values which include all bits
127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
129 #ifdef _GNU_SOURCE
130 // See bug #6514594
131 extern "C" int madvise(caddr_t, size_t, int);
132 extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg,
133 int attr, int mask);
134 #endif //_GNU_SOURCE
136 /*
137 MPSS Changes Start.
138 The JVM binary needs to be built and run on pre-Solaris 9
139 systems, but the constants needed by MPSS are only in Solaris 9
140 header files. They are textually replicated here to allow
141 building on earlier systems. Once building on Solaris 8 is
142 no longer a requirement, these #defines can be replaced by ordinary
143 system .h inclusion.
145 In earlier versions of the JDK and Solaris, we used ISM for large pages.
146 But ISM requires shared memory to achieve this and thus has many caveats.
147 MPSS is a fully transparent and is a cleaner way to get large pages.
148 Although we still require keeping ISM for backward compatiblitiy as well as
149 giving the opportunity to use large pages on older systems it is
150 recommended that MPSS be used for Solaris 9 and above.
152 */
154 #ifndef MC_HAT_ADVISE
156 struct memcntl_mha {
157 uint_t mha_cmd; /* command(s) */
158 uint_t mha_flags;
159 size_t mha_pagesize;
160 };
161 #define MC_HAT_ADVISE 7 /* advise hat map size */
162 #define MHA_MAPSIZE_VA 0x1 /* set preferred page size */
163 #define MAP_ALIGN 0x200 /* addr specifies alignment */
165 #endif
166 // MPSS Changes End.
169 // Here are some liblgrp types from sys/lgrp_user.h to be able to
170 // compile on older systems without this header file.
172 #ifndef MADV_ACCESS_LWP
173 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
174 #endif
175 #ifndef MADV_ACCESS_MANY
176 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
177 #endif
179 #ifndef LGRP_RSRC_CPU
180 # define LGRP_RSRC_CPU 0 /* CPU resources */
181 #endif
182 #ifndef LGRP_RSRC_MEM
183 # define LGRP_RSRC_MEM 1 /* memory resources */
184 #endif
186 // Some more macros from sys/mman.h that are not present in Solaris 8.
188 #ifndef MAX_MEMINFO_CNT
189 /*
190 * info_req request type definitions for meminfo
191 * request types starting with MEMINFO_V are used for Virtual addresses
192 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical
193 * addresses
194 */
195 # define MEMINFO_SHIFT 16
196 # define MEMINFO_MASK (0xFF << MEMINFO_SHIFT)
197 # define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */
198 # define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */
199 # define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */
200 # define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */
201 # define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */
202 # define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */
203 # define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */
205 /* maximum number of addresses meminfo() can process at a time */
206 # define MAX_MEMINFO_CNT 256
208 /* maximum number of request types */
209 # define MAX_MEMINFO_REQ 31
210 #endif
212 // see thr_setprio(3T) for the basis of these numbers
213 #define MinimumPriority 0
214 #define NormalPriority 64
215 #define MaximumPriority 127
217 // Values for ThreadPriorityPolicy == 1
218 int prio_policy1[MaxPriority+1] = { -99999, 0, 16, 32, 48, 64,
219 80, 96, 112, 124, 127 };
221 // System parameters used internally
222 static clock_t clock_tics_per_sec = 100;
224 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
225 static bool enabled_extended_FILE_stdio = false;
227 // For diagnostics to print a message once. see run_periodic_checks
228 static bool check_addr0_done = false;
229 static sigset_t check_signal_done;
230 static bool check_signals = true;
232 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
233 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
235 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
238 // "default" initializers for missing libc APIs
239 extern "C" {
240 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
241 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
243 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
244 static int lwp_cond_destroy(cond_t *cv) { return 0; }
245 }
247 // "default" initializers for pthread-based synchronization
248 extern "C" {
249 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
250 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
251 }
253 // Thread Local Storage
254 // This is common to all Solaris platforms so it is defined here,
255 // in this common file.
256 // The declarations are in the os_cpu threadLS*.hpp files.
257 //
258 // Static member initialization for TLS
259 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
261 #ifndef PRODUCT
262 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
264 int ThreadLocalStorage::_tcacheHit = 0;
265 int ThreadLocalStorage::_tcacheMiss = 0;
267 void ThreadLocalStorage::print_statistics() {
268 int total = _tcacheMiss+_tcacheHit;
269 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
270 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
271 }
272 #undef _PCT
273 #endif // PRODUCT
275 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
276 int index) {
277 Thread *thread = get_thread_slow();
278 if (thread != NULL) {
279 address sp = os::current_stack_pointer();
280 guarantee(thread->_stack_base == NULL ||
281 (sp <= thread->_stack_base &&
282 sp >= thread->_stack_base - thread->_stack_size) ||
283 is_error_reported(),
284 "sp must be inside of selected thread stack");
286 thread->set_self_raw_id(raw_id); // mark for quick retrieval
287 _get_thread_cache[ index ] = thread;
288 }
289 return thread;
290 }
293 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0};
294 #define NO_CACHED_THREAD ((Thread*)all_zero)
296 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
298 // Store the new value before updating the cache to prevent a race
299 // between get_thread_via_cache_slowly() and this store operation.
300 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
302 // Update thread cache with new thread if setting on thread create,
303 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
304 uintptr_t raw = pd_raw_thread_id();
305 int ix = pd_cache_index(raw);
306 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
307 }
309 void ThreadLocalStorage::pd_init() {
310 for (int i = 0; i < _pd_cache_size; i++) {
311 _get_thread_cache[i] = NO_CACHED_THREAD;
312 }
313 }
315 // Invalidate all the caches (happens to be the same as pd_init).
316 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
318 #undef NO_CACHED_THREAD
320 // END Thread Local Storage
322 static inline size_t adjust_stack_size(address base, size_t size) {
323 if ((ssize_t)size < 0) {
324 // 4759953: Compensate for ridiculous stack size.
325 size = max_intx;
326 }
327 if (size > (size_t)base) {
328 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
329 size = (size_t)base;
330 }
331 return size;
332 }
334 static inline stack_t get_stack_info() {
335 stack_t st;
336 int retval = thr_stksegment(&st);
337 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
338 assert(retval == 0, "incorrect return value from thr_stksegment");
339 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
340 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
341 return st;
342 }
344 address os::current_stack_base() {
345 int r = thr_main() ;
346 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
347 bool is_primordial_thread = r;
349 // Workaround 4352906, avoid calls to thr_stksegment by
350 // thr_main after the first one (it looks like we trash
351 // some data, causing the value for ss_sp to be incorrect).
352 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
353 stack_t st = get_stack_info();
354 if (is_primordial_thread) {
355 // cache initial value of stack base
356 os::Solaris::_main_stack_base = (address)st.ss_sp;
357 }
358 return (address)st.ss_sp;
359 } else {
360 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
361 return os::Solaris::_main_stack_base;
362 }
363 }
365 size_t os::current_stack_size() {
366 size_t size;
368 int r = thr_main() ;
369 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
370 if(!r) {
371 size = get_stack_info().ss_size;
372 } else {
373 struct rlimit limits;
374 getrlimit(RLIMIT_STACK, &limits);
375 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
376 }
377 // base may not be page aligned
378 address base = current_stack_base();
379 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
380 return (size_t)(base - bottom);
381 }
383 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
384 return localtime_r(clock, res);
385 }
387 // interruptible infrastructure
389 // setup_interruptible saves the thread state before going into an
390 // interruptible system call.
391 // The saved state is used to restore the thread to
392 // its former state whether or not an interrupt is received.
393 // Used by classloader os::read
394 // os::restartable_read calls skip this layer and stay in _thread_in_native
396 void os::Solaris::setup_interruptible(JavaThread* thread) {
398 JavaThreadState thread_state = thread->thread_state();
400 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
401 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
402 OSThread* osthread = thread->osthread();
403 osthread->set_saved_interrupt_thread_state(thread_state);
404 thread->frame_anchor()->make_walkable(thread);
405 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
406 }
408 // Version of setup_interruptible() for threads that are already in
409 // _thread_blocked. Used by os_sleep().
410 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
411 thread->frame_anchor()->make_walkable(thread);
412 }
414 JavaThread* os::Solaris::setup_interruptible() {
415 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
416 setup_interruptible(thread);
417 return thread;
418 }
420 void os::Solaris::try_enable_extended_io() {
421 typedef int (*enable_extended_FILE_stdio_t)(int, int);
423 if (!UseExtendedFileIO) {
424 return;
425 }
427 enable_extended_FILE_stdio_t enabler =
428 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
429 "enable_extended_FILE_stdio");
430 if (enabler) {
431 enabler(-1, -1);
432 }
433 }
436 #ifdef ASSERT
438 JavaThread* os::Solaris::setup_interruptible_native() {
439 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
440 JavaThreadState thread_state = thread->thread_state();
441 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
442 return thread;
443 }
445 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
446 JavaThreadState thread_state = thread->thread_state();
447 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
448 }
449 #endif
451 // cleanup_interruptible reverses the effects of setup_interruptible
452 // setup_interruptible_already_blocked() does not need any cleanup.
454 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
455 OSThread* osthread = thread->osthread();
457 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
458 }
460 // I/O interruption related counters called in _INTERRUPTIBLE
462 void os::Solaris::bump_interrupted_before_count() {
463 RuntimeService::record_interrupted_before_count();
464 }
466 void os::Solaris::bump_interrupted_during_count() {
467 RuntimeService::record_interrupted_during_count();
468 }
470 static int _processors_online = 0;
472 jint os::Solaris::_os_thread_limit = 0;
473 volatile jint os::Solaris::_os_thread_count = 0;
475 julong os::available_memory() {
476 return Solaris::available_memory();
477 }
479 julong os::Solaris::available_memory() {
480 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
481 }
483 julong os::Solaris::_physical_memory = 0;
485 julong os::physical_memory() {
486 return Solaris::physical_memory();
487 }
489 julong os::allocatable_physical_memory(julong size) {
490 #ifdef _LP64
491 return size;
492 #else
493 julong result = MIN2(size, (julong)3835*M);
494 if (!is_allocatable(result)) {
495 // Memory allocations will be aligned but the alignment
496 // is not known at this point. Alignments will
497 // be at most to LargePageSizeInBytes. Protect
498 // allocations from alignments up to illegal
499 // values. If at this point 2G is illegal.
500 julong reasonable_size = (julong)2*G - 2 * LargePageSizeInBytes;
501 result = MIN2(size, reasonable_size);
502 }
503 return result;
504 #endif
505 }
507 static hrtime_t first_hrtime = 0;
508 static const hrtime_t hrtime_hz = 1000*1000*1000;
509 const int LOCK_BUSY = 1;
510 const int LOCK_FREE = 0;
511 const int LOCK_INVALID = -1;
512 static volatile hrtime_t max_hrtime = 0;
513 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress
516 void os::Solaris::initialize_system_info() {
517 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
518 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
519 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
520 }
522 int os::active_processor_count() {
523 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
524 pid_t pid = getpid();
525 psetid_t pset = PS_NONE;
526 // Are we running in a processor set or is there any processor set around?
527 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
528 uint_t pset_cpus;
529 // Query the number of cpus available to us.
530 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
531 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
532 _processors_online = pset_cpus;
533 return pset_cpus;
534 }
535 }
536 // Otherwise return number of online cpus
537 return online_cpus;
538 }
540 static bool find_processors_in_pset(psetid_t pset,
541 processorid_t** id_array,
542 uint_t* id_length) {
543 bool result = false;
544 // Find the number of processors in the processor set.
545 if (pset_info(pset, NULL, id_length, NULL) == 0) {
546 // Make up an array to hold their ids.
547 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length);
548 // Fill in the array with their processor ids.
549 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
550 result = true;
551 }
552 }
553 return result;
554 }
556 // Callers of find_processors_online() must tolerate imprecise results --
557 // the system configuration can change asynchronously because of DR
558 // or explicit psradm operations.
559 //
560 // We also need to take care that the loop (below) terminates as the
561 // number of processors online can change between the _SC_NPROCESSORS_ONLN
562 // request and the loop that builds the list of processor ids. Unfortunately
563 // there's no reliable way to determine the maximum valid processor id,
564 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
565 // man pages, which claim the processor id set is "sparse, but
566 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
567 // exit the loop.
568 //
569 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
570 // not available on S8.0.
572 static bool find_processors_online(processorid_t** id_array,
573 uint* id_length) {
574 const processorid_t MAX_PROCESSOR_ID = 100000 ;
575 // Find the number of processors online.
576 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
577 // Make up an array to hold their ids.
578 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length);
579 // Processors need not be numbered consecutively.
580 long found = 0;
581 processorid_t next = 0;
582 while (found < *id_length && next < MAX_PROCESSOR_ID) {
583 processor_info_t info;
584 if (processor_info(next, &info) == 0) {
585 // NB, PI_NOINTR processors are effectively online ...
586 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
587 (*id_array)[found] = next;
588 found += 1;
589 }
590 }
591 next += 1;
592 }
593 if (found < *id_length) {
594 // The loop above didn't identify the expected number of processors.
595 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
596 // and re-running the loop, above, but there's no guarantee of progress
597 // if the system configuration is in flux. Instead, we just return what
598 // we've got. Note that in the worst case find_processors_online() could
599 // return an empty set. (As a fall-back in the case of the empty set we
600 // could just return the ID of the current processor).
601 *id_length = found ;
602 }
604 return true;
605 }
607 static bool assign_distribution(processorid_t* id_array,
608 uint id_length,
609 uint* distribution,
610 uint distribution_length) {
611 // We assume we can assign processorid_t's to uint's.
612 assert(sizeof(processorid_t) == sizeof(uint),
613 "can't convert processorid_t to uint");
614 // Quick check to see if we won't succeed.
615 if (id_length < distribution_length) {
616 return false;
617 }
618 // Assign processor ids to the distribution.
619 // Try to shuffle processors to distribute work across boards,
620 // assuming 4 processors per board.
621 const uint processors_per_board = ProcessDistributionStride;
622 // Find the maximum processor id.
623 processorid_t max_id = 0;
624 for (uint m = 0; m < id_length; m += 1) {
625 max_id = MAX2(max_id, id_array[m]);
626 }
627 // The next id, to limit loops.
628 const processorid_t limit_id = max_id + 1;
629 // Make up markers for available processors.
630 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id);
631 for (uint c = 0; c < limit_id; c += 1) {
632 available_id[c] = false;
633 }
634 for (uint a = 0; a < id_length; a += 1) {
635 available_id[id_array[a]] = true;
636 }
637 // Step by "boards", then by "slot", copying to "assigned".
638 // NEEDS_CLEANUP: The assignment of processors should be stateful,
639 // remembering which processors have been assigned by
640 // previous calls, etc., so as to distribute several
641 // independent calls of this method. What we'd like is
642 // It would be nice to have an API that let us ask
643 // how many processes are bound to a processor,
644 // but we don't have that, either.
645 // In the short term, "board" is static so that
646 // subsequent distributions don't all start at board 0.
647 static uint board = 0;
648 uint assigned = 0;
649 // Until we've found enough processors ....
650 while (assigned < distribution_length) {
651 // ... find the next available processor in the board.
652 for (uint slot = 0; slot < processors_per_board; slot += 1) {
653 uint try_id = board * processors_per_board + slot;
654 if ((try_id < limit_id) && (available_id[try_id] == true)) {
655 distribution[assigned] = try_id;
656 available_id[try_id] = false;
657 assigned += 1;
658 break;
659 }
660 }
661 board += 1;
662 if (board * processors_per_board + 0 >= limit_id) {
663 board = 0;
664 }
665 }
666 if (available_id != NULL) {
667 FREE_C_HEAP_ARRAY(bool, available_id);
668 }
669 return true;
670 }
672 bool os::distribute_processes(uint length, uint* distribution) {
673 bool result = false;
674 // Find the processor id's of all the available CPUs.
675 processorid_t* id_array = NULL;
676 uint id_length = 0;
677 // There are some races between querying information and using it,
678 // since processor sets can change dynamically.
679 psetid_t pset = PS_NONE;
680 // Are we running in a processor set?
681 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
682 result = find_processors_in_pset(pset, &id_array, &id_length);
683 } else {
684 result = find_processors_online(&id_array, &id_length);
685 }
686 if (result == true) {
687 if (id_length >= length) {
688 result = assign_distribution(id_array, id_length, distribution, length);
689 } else {
690 result = false;
691 }
692 }
693 if (id_array != NULL) {
694 FREE_C_HEAP_ARRAY(processorid_t, id_array);
695 }
696 return result;
697 }
699 bool os::bind_to_processor(uint processor_id) {
700 // We assume that a processorid_t can be stored in a uint.
701 assert(sizeof(uint) == sizeof(processorid_t),
702 "can't convert uint to processorid_t");
703 int bind_result =
704 processor_bind(P_LWPID, // bind LWP.
705 P_MYID, // bind current LWP.
706 (processorid_t) processor_id, // id.
707 NULL); // don't return old binding.
708 return (bind_result == 0);
709 }
711 bool os::getenv(const char* name, char* buffer, int len) {
712 char* val = ::getenv( name );
713 if ( val == NULL
714 || strlen(val) + 1 > len ) {
715 if (len > 0) buffer[0] = 0; // return a null string
716 return false;
717 }
718 strcpy( buffer, val );
719 return true;
720 }
723 // Return true if user is running as root.
725 bool os::have_special_privileges() {
726 static bool init = false;
727 static bool privileges = false;
728 if (!init) {
729 privileges = (getuid() != geteuid()) || (getgid() != getegid());
730 init = true;
731 }
732 return privileges;
733 }
736 void os::init_system_properties_values() {
737 char arch[12];
738 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
740 // The next steps are taken in the product version:
741 //
742 // Obtain the JAVA_HOME value from the location of libjvm[_g].so.
743 // This library should be located at:
744 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so.
745 //
746 // If "/jre/lib/" appears at the right place in the path, then we
747 // assume libjvm[_g].so is installed in a JDK and we use this path.
748 //
749 // Otherwise exit with message: "Could not create the Java virtual machine."
750 //
751 // The following extra steps are taken in the debugging version:
752 //
753 // If "/jre/lib/" does NOT appear at the right place in the path
754 // instead of exit check for $JAVA_HOME environment variable.
755 //
756 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
757 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so
758 // it looks like libjvm[_g].so is installed there
759 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so.
760 //
761 // Otherwise exit.
762 //
763 // Important note: if the location of libjvm.so changes this
764 // code needs to be changed accordingly.
766 // The next few definitions allow the code to be verbatim:
767 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n))
768 #define free(p) FREE_C_HEAP_ARRAY(char, p)
769 #define getenv(n) ::getenv(n)
771 #define EXTENSIONS_DIR "/lib/ext"
772 #define ENDORSED_DIR "/lib/endorsed"
773 #define COMMON_DIR "/usr/jdk/packages"
775 {
776 /* sysclasspath, java_home, dll_dir */
777 {
778 char *home_path;
779 char *dll_path;
780 char *pslash;
781 char buf[MAXPATHLEN];
782 os::jvm_path(buf, sizeof(buf));
784 // Found the full path to libjvm.so.
785 // Now cut the path to <java_home>/jre if we can.
786 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
787 pslash = strrchr(buf, '/');
788 if (pslash != NULL)
789 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
790 dll_path = malloc(strlen(buf) + 1);
791 if (dll_path == NULL)
792 return;
793 strcpy(dll_path, buf);
794 Arguments::set_dll_dir(dll_path);
796 if (pslash != NULL) {
797 pslash = strrchr(buf, '/');
798 if (pslash != NULL) {
799 *pslash = '\0'; /* get rid of /<arch> */
800 pslash = strrchr(buf, '/');
801 if (pslash != NULL)
802 *pslash = '\0'; /* get rid of /lib */
803 }
804 }
806 home_path = malloc(strlen(buf) + 1);
807 if (home_path == NULL)
808 return;
809 strcpy(home_path, buf);
810 Arguments::set_java_home(home_path);
812 if (!set_boot_path('/', ':'))
813 return;
814 }
816 /*
817 * Where to look for native libraries
818 */
819 {
820 // Use dlinfo() to determine the correct java.library.path.
821 //
822 // If we're launched by the Java launcher, and the user
823 // does not set java.library.path explicitly on the commandline,
824 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
825 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
826 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
827 // /usr/lib), which is exactly what we want.
828 //
829 // If the user does set java.library.path, it completely
830 // overwrites this setting, and always has.
831 //
832 // If we're not launched by the Java launcher, we may
833 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
834 // settings. Again, dlinfo does exactly what we want.
836 Dl_serinfo _info, *info = &_info;
837 Dl_serpath *path;
838 char* library_path;
839 char *common_path;
840 int i;
842 // determine search path count and required buffer size
843 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
844 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
845 }
847 // allocate new buffer and initialize
848 info = (Dl_serinfo*)malloc(_info.dls_size);
849 if (info == NULL) {
850 vm_exit_out_of_memory(_info.dls_size,
851 "init_system_properties_values info");
852 }
853 info->dls_size = _info.dls_size;
854 info->dls_cnt = _info.dls_cnt;
856 // obtain search path information
857 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
858 free(info);
859 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
860 }
862 path = &info->dls_serpath[0];
864 // Note: Due to a legacy implementation, most of the library path
865 // is set in the launcher. This was to accomodate linking restrictions
866 // on legacy Solaris implementations (which are no longer supported).
867 // Eventually, all the library path setting will be done here.
868 //
869 // However, to prevent the proliferation of improperly built native
870 // libraries, the new path component /usr/jdk/packages is added here.
872 // Determine the actual CPU architecture.
873 char cpu_arch[12];
874 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
875 #ifdef _LP64
876 // If we are a 64-bit vm, perform the following translations:
877 // sparc -> sparcv9
878 // i386 -> amd64
879 if (strcmp(cpu_arch, "sparc") == 0)
880 strcat(cpu_arch, "v9");
881 else if (strcmp(cpu_arch, "i386") == 0)
882 strcpy(cpu_arch, "amd64");
883 #endif
885 // Construct the invariant part of ld_library_path. Note that the
886 // space for the colon and the trailing null are provided by the
887 // nulls included by the sizeof operator.
888 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch);
889 common_path = malloc(bufsize);
890 if (common_path == NULL) {
891 free(info);
892 vm_exit_out_of_memory(bufsize,
893 "init_system_properties_values common_path");
894 }
895 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch);
897 // struct size is more than sufficient for the path components obtained
898 // through the dlinfo() call, so only add additional space for the path
899 // components explicitly added here.
900 bufsize = info->dls_size + strlen(common_path);
901 library_path = malloc(bufsize);
902 if (library_path == NULL) {
903 free(info);
904 free(common_path);
905 vm_exit_out_of_memory(bufsize,
906 "init_system_properties_values library_path");
907 }
908 library_path[0] = '\0';
910 // Construct the desired Java library path from the linker's library
911 // search path.
912 //
913 // For compatibility, it is optimal that we insert the additional path
914 // components specific to the Java VM after those components specified
915 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
916 // infrastructure.
917 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it
918 strcpy(library_path, common_path);
919 } else {
920 int inserted = 0;
921 for (i = 0; i < info->dls_cnt; i++, path++) {
922 uint_t flags = path->dls_flags & LA_SER_MASK;
923 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
924 strcat(library_path, common_path);
925 strcat(library_path, os::path_separator());
926 inserted = 1;
927 }
928 strcat(library_path, path->dls_name);
929 strcat(library_path, os::path_separator());
930 }
931 // eliminate trailing path separator
932 library_path[strlen(library_path)-1] = '\0';
933 }
935 // happens before argument parsing - can't use a trace flag
936 // tty->print_raw("init_system_properties_values: native lib path: ");
937 // tty->print_raw_cr(library_path);
939 // callee copies into its own buffer
940 Arguments::set_library_path(library_path);
942 free(common_path);
943 free(library_path);
944 free(info);
945 }
947 /*
948 * Extensions directories.
949 *
950 * Note that the space for the colon and the trailing null are provided
951 * by the nulls included by the sizeof operator (so actually one byte more
952 * than necessary is allocated).
953 */
954 {
955 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) +
956 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) +
957 sizeof(EXTENSIONS_DIR));
958 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR,
959 Arguments::get_java_home());
960 Arguments::set_ext_dirs(buf);
961 }
963 /* Endorsed standards default directory. */
964 {
965 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
966 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
967 Arguments::set_endorsed_dirs(buf);
968 }
969 }
971 #undef malloc
972 #undef free
973 #undef getenv
974 #undef EXTENSIONS_DIR
975 #undef ENDORSED_DIR
976 #undef COMMON_DIR
978 }
980 void os::breakpoint() {
981 BREAKPOINT;
982 }
984 bool os::obsolete_option(const JavaVMOption *option)
985 {
986 if (!strncmp(option->optionString, "-Xt", 3)) {
987 return true;
988 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
989 return true;
990 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
991 return true;
992 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
993 return true;
994 }
995 return false;
996 }
998 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
999 address stackStart = (address)thread->stack_base();
1000 address stackEnd = (address)(stackStart - (address)thread->stack_size());
1001 if (sp < stackStart && sp >= stackEnd ) return true;
1002 return false;
1003 }
1005 extern "C" void breakpoint() {
1006 // use debugger to set breakpoint here
1007 }
1009 // Returns an estimate of the current stack pointer. Result must be guaranteed to
1010 // point into the calling threads stack, and be no lower than the current stack
1011 // pointer.
1012 address os::current_stack_pointer() {
1013 volatile int dummy;
1014 address sp = (address)&dummy + 8; // %%%% need to confirm if this is right
1015 return sp;
1016 }
1018 static thread_t main_thread;
1020 // Thread start routine for all new Java threads
1021 extern "C" void* java_start(void* thread_addr) {
1022 // Try to randomize the cache line index of hot stack frames.
1023 // This helps when threads of the same stack traces evict each other's
1024 // cache lines. The threads can be either from the same JVM instance, or
1025 // from different JVM instances. The benefit is especially true for
1026 // processors with hyperthreading technology.
1027 static int counter = 0;
1028 int pid = os::current_process_id();
1029 alloca(((pid ^ counter++) & 7) * 128);
1031 int prio;
1032 Thread* thread = (Thread*)thread_addr;
1033 OSThread* osthr = thread->osthread();
1035 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
1036 thread->_schedctl = (void *) schedctl_init () ;
1038 if (UseNUMA) {
1039 int lgrp_id = os::numa_get_group_id();
1040 if (lgrp_id != -1) {
1041 thread->set_lgrp_id(lgrp_id);
1042 }
1043 }
1045 // If the creator called set priority before we started,
1046 // we need to call set priority now that we have an lwp.
1047 // Get the priority from libthread and set the priority
1048 // for the new Solaris lwp.
1049 if ( osthr->thread_id() != -1 ) {
1050 if ( UseThreadPriorities ) {
1051 thr_getprio(osthr->thread_id(), &prio);
1052 if (ThreadPriorityVerbose) {
1053 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT ", setting priority: %d\n",
1054 osthr->thread_id(), osthr->lwp_id(), prio );
1055 }
1056 os::set_native_priority(thread, prio);
1057 }
1058 } else if (ThreadPriorityVerbose) {
1059 warning("Can't set priority in _start routine, thread id hasn't been set\n");
1060 }
1062 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
1064 // initialize signal mask for this thread
1065 os::Solaris::hotspot_sigmask(thread);
1067 thread->run();
1069 // One less thread is executing
1070 // When the VMThread gets here, the main thread may have already exited
1071 // which frees the CodeHeap containing the Atomic::dec code
1072 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
1073 Atomic::dec(&os::Solaris::_os_thread_count);
1074 }
1076 if (UseDetachedThreads) {
1077 thr_exit(NULL);
1078 ShouldNotReachHere();
1079 }
1080 return NULL;
1081 }
1083 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
1084 // Allocate the OSThread object
1085 OSThread* osthread = new OSThread(NULL, NULL);
1086 if (osthread == NULL) return NULL;
1088 // Store info on the Solaris thread into the OSThread
1089 osthread->set_thread_id(thread_id);
1090 osthread->set_lwp_id(_lwp_self());
1091 thread->_schedctl = (void *) schedctl_init () ;
1093 if (UseNUMA) {
1094 int lgrp_id = os::numa_get_group_id();
1095 if (lgrp_id != -1) {
1096 thread->set_lgrp_id(lgrp_id);
1097 }
1098 }
1100 if ( ThreadPriorityVerbose ) {
1101 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
1102 osthread->thread_id(), osthread->lwp_id() );
1103 }
1105 // Initial thread state is INITIALIZED, not SUSPENDED
1106 osthread->set_state(INITIALIZED);
1108 return osthread;
1109 }
1111 void os::Solaris::hotspot_sigmask(Thread* thread) {
1113 //Save caller's signal mask
1114 sigset_t sigmask;
1115 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
1116 OSThread *osthread = thread->osthread();
1117 osthread->set_caller_sigmask(sigmask);
1119 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
1120 if (!ReduceSignalUsage) {
1121 if (thread->is_VM_thread()) {
1122 // Only the VM thread handles BREAK_SIGNAL ...
1123 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
1124 } else {
1125 // ... all other threads block BREAK_SIGNAL
1126 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
1127 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
1128 }
1129 }
1130 }
1132 bool os::create_attached_thread(JavaThread* thread) {
1133 #ifdef ASSERT
1134 thread->verify_not_published();
1135 #endif
1136 OSThread* osthread = create_os_thread(thread, thr_self());
1137 if (osthread == NULL) {
1138 return false;
1139 }
1141 // Initial thread state is RUNNABLE
1142 osthread->set_state(RUNNABLE);
1143 thread->set_osthread(osthread);
1145 // initialize signal mask for this thread
1146 // and save the caller's signal mask
1147 os::Solaris::hotspot_sigmask(thread);
1149 return true;
1150 }
1152 bool os::create_main_thread(JavaThread* thread) {
1153 #ifdef ASSERT
1154 thread->verify_not_published();
1155 #endif
1156 if (_starting_thread == NULL) {
1157 _starting_thread = create_os_thread(thread, main_thread);
1158 if (_starting_thread == NULL) {
1159 return false;
1160 }
1161 }
1163 // The primodial thread is runnable from the start
1164 _starting_thread->set_state(RUNNABLE);
1166 thread->set_osthread(_starting_thread);
1168 // initialize signal mask for this thread
1169 // and save the caller's signal mask
1170 os::Solaris::hotspot_sigmask(thread);
1172 return true;
1173 }
1175 // _T2_libthread is true if we believe we are running with the newer
1176 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
1177 bool os::Solaris::_T2_libthread = false;
1179 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
1180 // Allocate the OSThread object
1181 OSThread* osthread = new OSThread(NULL, NULL);
1182 if (osthread == NULL) {
1183 return false;
1184 }
1186 if ( ThreadPriorityVerbose ) {
1187 char *thrtyp;
1188 switch ( thr_type ) {
1189 case vm_thread:
1190 thrtyp = (char *)"vm";
1191 break;
1192 case cgc_thread:
1193 thrtyp = (char *)"cgc";
1194 break;
1195 case pgc_thread:
1196 thrtyp = (char *)"pgc";
1197 break;
1198 case java_thread:
1199 thrtyp = (char *)"java";
1200 break;
1201 case compiler_thread:
1202 thrtyp = (char *)"compiler";
1203 break;
1204 case watcher_thread:
1205 thrtyp = (char *)"watcher";
1206 break;
1207 default:
1208 thrtyp = (char *)"unknown";
1209 break;
1210 }
1211 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1212 }
1214 // Calculate stack size if it's not specified by caller.
1215 if (stack_size == 0) {
1216 // The default stack size 1M (2M for LP64).
1217 stack_size = (BytesPerWord >> 2) * K * K;
1219 switch (thr_type) {
1220 case os::java_thread:
1221 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1222 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1223 break;
1224 case os::compiler_thread:
1225 if (CompilerThreadStackSize > 0) {
1226 stack_size = (size_t)(CompilerThreadStackSize * K);
1227 break;
1228 } // else fall through:
1229 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1230 case os::vm_thread:
1231 case os::pgc_thread:
1232 case os::cgc_thread:
1233 case os::watcher_thread:
1234 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1235 break;
1236 }
1237 }
1238 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1240 // Initial state is ALLOCATED but not INITIALIZED
1241 osthread->set_state(ALLOCATED);
1243 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1244 // We got lots of threads. Check if we still have some address space left.
1245 // Need to be at least 5Mb of unreserved address space. We do check by
1246 // trying to reserve some.
1247 const size_t VirtualMemoryBangSize = 20*K*K;
1248 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1249 if (mem == NULL) {
1250 delete osthread;
1251 return false;
1252 } else {
1253 // Release the memory again
1254 os::release_memory(mem, VirtualMemoryBangSize);
1255 }
1256 }
1258 // Setup osthread because the child thread may need it.
1259 thread->set_osthread(osthread);
1261 // Create the Solaris thread
1262 // explicit THR_BOUND for T2_libthread case in case
1263 // that assumption is not accurate, but our alternate signal stack
1264 // handling is based on it which must have bound threads
1265 thread_t tid = 0;
1266 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1267 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1268 (thr_type == vm_thread) ||
1269 (thr_type == cgc_thread) ||
1270 (thr_type == pgc_thread) ||
1271 (thr_type == compiler_thread && BackgroundCompilation)) ?
1272 THR_BOUND : 0);
1273 int status;
1275 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1276 //
1277 // On multiprocessors systems, libthread sometimes under-provisions our
1278 // process with LWPs. On a 30-way systems, for instance, we could have
1279 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1280 // to our process. This can result in under utilization of PEs.
1281 // I suspect the problem is related to libthread's LWP
1282 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1283 // upcall policy.
1284 //
1285 // The following code is palliative -- it attempts to ensure that our
1286 // process has sufficient LWPs to take advantage of multiple PEs.
1287 // Proper long-term cures include using user-level threads bound to LWPs
1288 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1289 // slight timing window with respect to sampling _os_thread_count, but
1290 // the race is benign. Also, we should periodically recompute
1291 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1292 // the number of PEs in our partition. You might be tempted to use
1293 // THR_NEW_LWP here, but I'd recommend against it as that could
1294 // result in undesirable growth of the libthread's LWP pool.
1295 // The fix below isn't sufficient; for instance, it doesn't take into count
1296 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1297 //
1298 // Some pathologies this scheme doesn't handle:
1299 // * Threads can block, releasing the LWPs. The LWPs can age out.
1300 // When a large number of threads become ready again there aren't
1301 // enough LWPs available to service them. This can occur when the
1302 // number of ready threads oscillates.
1303 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1304 //
1305 // Finally, we should call thr_setconcurrency() periodically to refresh
1306 // the LWP pool and thwart the LWP age-out mechanism.
1307 // The "+3" term provides a little slop -- we want to slightly overprovision.
1309 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1310 if (!(flags & THR_BOUND)) {
1311 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1312 }
1313 }
1314 // Although this doesn't hurt, we should warn of undefined behavior
1315 // when using unbound T1 threads with schedctl(). This should never
1316 // happen, as the compiler and VM threads are always created bound
1317 DEBUG_ONLY(
1318 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1319 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1320 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1321 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1322 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1323 }
1324 );
1327 // Mark that we don't have an lwp or thread id yet.
1328 // In case we attempt to set the priority before the thread starts.
1329 osthread->set_lwp_id(-1);
1330 osthread->set_thread_id(-1);
1332 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1333 if (status != 0) {
1334 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1335 perror("os::create_thread");
1336 }
1337 thread->set_osthread(NULL);
1338 // Need to clean up stuff we've allocated so far
1339 delete osthread;
1340 return false;
1341 }
1343 Atomic::inc(&os::Solaris::_os_thread_count);
1345 // Store info on the Solaris thread into the OSThread
1346 osthread->set_thread_id(tid);
1348 // Remember that we created this thread so we can set priority on it
1349 osthread->set_vm_created();
1351 // Set the default thread priority otherwise use NormalPriority
1353 if ( UseThreadPriorities ) {
1354 thr_setprio(tid, (DefaultThreadPriority == -1) ?
1355 java_to_os_priority[NormPriority] :
1356 DefaultThreadPriority);
1357 }
1359 // Initial thread state is INITIALIZED, not SUSPENDED
1360 osthread->set_state(INITIALIZED);
1362 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1363 return true;
1364 }
1366 /* defined for >= Solaris 10. This allows builds on earlier versions
1367 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1368 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1369 * and -XX:+UseAltSigs does nothing since these should have no conflict
1370 */
1371 #if !defined(SIGJVM1)
1372 #define SIGJVM1 39
1373 #define SIGJVM2 40
1374 #endif
1376 debug_only(static bool signal_sets_initialized = false);
1377 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1378 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1379 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1381 bool os::Solaris::is_sig_ignored(int sig) {
1382 struct sigaction oact;
1383 sigaction(sig, (struct sigaction*)NULL, &oact);
1384 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1385 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1386 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1387 return true;
1388 else
1389 return false;
1390 }
1392 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1393 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1394 static bool isJVM1available() {
1395 return SIGJVM1 < SIGRTMIN;
1396 }
1398 void os::Solaris::signal_sets_init() {
1399 // Should also have an assertion stating we are still single-threaded.
1400 assert(!signal_sets_initialized, "Already initialized");
1401 // Fill in signals that are necessarily unblocked for all threads in
1402 // the VM. Currently, we unblock the following signals:
1403 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1404 // by -Xrs (=ReduceSignalUsage));
1405 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1406 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1407 // the dispositions or masks wrt these signals.
1408 // Programs embedding the VM that want to use the above signals for their
1409 // own purposes must, at this time, use the "-Xrs" option to prevent
1410 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1411 // (See bug 4345157, and other related bugs).
1412 // In reality, though, unblocking these signals is really a nop, since
1413 // these signals are not blocked by default.
1414 sigemptyset(&unblocked_sigs);
1415 sigemptyset(&allowdebug_blocked_sigs);
1416 sigaddset(&unblocked_sigs, SIGILL);
1417 sigaddset(&unblocked_sigs, SIGSEGV);
1418 sigaddset(&unblocked_sigs, SIGBUS);
1419 sigaddset(&unblocked_sigs, SIGFPE);
1421 if (isJVM1available) {
1422 os::Solaris::set_SIGinterrupt(SIGJVM1);
1423 os::Solaris::set_SIGasync(SIGJVM2);
1424 } else if (UseAltSigs) {
1425 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1426 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1427 } else {
1428 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1429 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1430 }
1432 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1433 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1435 if (!ReduceSignalUsage) {
1436 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1437 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1438 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1439 }
1440 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1441 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1442 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1443 }
1444 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1445 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1446 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1447 }
1448 }
1449 // Fill in signals that are blocked by all but the VM thread.
1450 sigemptyset(&vm_sigs);
1451 if (!ReduceSignalUsage)
1452 sigaddset(&vm_sigs, BREAK_SIGNAL);
1453 debug_only(signal_sets_initialized = true);
1455 // For diagnostics only used in run_periodic_checks
1456 sigemptyset(&check_signal_done);
1457 }
1459 // These are signals that are unblocked while a thread is running Java.
1460 // (For some reason, they get blocked by default.)
1461 sigset_t* os::Solaris::unblocked_signals() {
1462 assert(signal_sets_initialized, "Not initialized");
1463 return &unblocked_sigs;
1464 }
1466 // These are the signals that are blocked while a (non-VM) thread is
1467 // running Java. Only the VM thread handles these signals.
1468 sigset_t* os::Solaris::vm_signals() {
1469 assert(signal_sets_initialized, "Not initialized");
1470 return &vm_sigs;
1471 }
1473 // These are signals that are blocked during cond_wait to allow debugger in
1474 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1475 assert(signal_sets_initialized, "Not initialized");
1476 return &allowdebug_blocked_sigs;
1477 }
1480 void _handle_uncaught_cxx_exception() {
1481 VMError err("An uncaught C++ exception");
1482 err.report_and_die();
1483 }
1486 // First crack at OS-specific initialization, from inside the new thread.
1487 void os::initialize_thread() {
1488 int r = thr_main() ;
1489 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1490 if (r) {
1491 JavaThread* jt = (JavaThread *)Thread::current();
1492 assert(jt != NULL,"Sanity check");
1493 size_t stack_size;
1494 address base = jt->stack_base();
1495 if (Arguments::created_by_java_launcher()) {
1496 // Use 2MB to allow for Solaris 7 64 bit mode.
1497 stack_size = JavaThread::stack_size_at_create() == 0
1498 ? 2048*K : JavaThread::stack_size_at_create();
1500 // There are rare cases when we may have already used more than
1501 // the basic stack size allotment before this method is invoked.
1502 // Attempt to allow for a normally sized java_stack.
1503 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1504 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1505 } else {
1506 // 6269555: If we were not created by a Java launcher, i.e. if we are
1507 // running embedded in a native application, treat the primordial thread
1508 // as much like a native attached thread as possible. This means using
1509 // the current stack size from thr_stksegment(), unless it is too large
1510 // to reliably setup guard pages. A reasonable max size is 8MB.
1511 size_t current_size = current_stack_size();
1512 // This should never happen, but just in case....
1513 if (current_size == 0) current_size = 2 * K * K;
1514 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1515 }
1516 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1517 stack_size = (size_t)(base - bottom);
1519 assert(stack_size > 0, "Stack size calculation problem");
1521 if (stack_size > jt->stack_size()) {
1522 NOT_PRODUCT(
1523 struct rlimit limits;
1524 getrlimit(RLIMIT_STACK, &limits);
1525 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1526 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1527 )
1528 tty->print_cr(
1529 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1530 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1531 "See limit(1) to increase the stack size limit.",
1532 stack_size / K, jt->stack_size() / K);
1533 vm_exit(1);
1534 }
1535 assert(jt->stack_size() >= stack_size,
1536 "Attempt to map more stack than was allocated");
1537 jt->set_stack_size(stack_size);
1538 }
1540 // 5/22/01: Right now alternate signal stacks do not handle
1541 // throwing stack overflow exceptions, see bug 4463178
1542 // Until a fix is found for this, T2 will NOT imply alternate signal
1543 // stacks.
1544 // If using T2 libthread threads, install an alternate signal stack.
1545 // Because alternate stacks associate with LWPs on Solaris,
1546 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1547 // we prefer to explicitly stack bang.
1548 // If not using T2 libthread, but using UseBoundThreads any threads
1549 // (primordial thread, jni_attachCurrentThread) we do not create,
1550 // probably are not bound, therefore they can not have an alternate
1551 // signal stack. Since our stack banging code is generated and
1552 // is shared across threads, all threads must be bound to allow
1553 // using alternate signal stacks. The alternative is to interpose
1554 // on _lwp_create to associate an alt sig stack with each LWP,
1555 // and this could be a problem when the JVM is embedded.
1556 // We would prefer to use alternate signal stacks with T2
1557 // Since there is currently no accurate way to detect T2
1558 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1559 // on installing alternate signal stacks
1562 // 05/09/03: removed alternate signal stack support for Solaris
1563 // The alternate signal stack mechanism is no longer needed to
1564 // handle stack overflow. This is now handled by allocating
1565 // guard pages (red zone) and stackbanging.
1566 // Initially the alternate signal stack mechanism was removed because
1567 // it did not work with T1 llibthread. Alternate
1568 // signal stacks MUST have all threads bound to lwps. Applications
1569 // can create their own threads and attach them without their being
1570 // bound under T1. This is frequently the case for the primordial thread.
1571 // If we were ever to reenable this mechanism we would need to
1572 // use the dynamic check for T2 libthread.
1574 os::Solaris::init_thread_fpu_state();
1575 std::set_terminate(_handle_uncaught_cxx_exception);
1576 }
1580 // Free Solaris resources related to the OSThread
1581 void os::free_thread(OSThread* osthread) {
1582 assert(osthread != NULL, "os::free_thread but osthread not set");
1585 // We are told to free resources of the argument thread,
1586 // but we can only really operate on the current thread.
1587 // The main thread must take the VMThread down synchronously
1588 // before the main thread exits and frees up CodeHeap
1589 guarantee((Thread::current()->osthread() == osthread
1590 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1591 if (Thread::current()->osthread() == osthread) {
1592 // Restore caller's signal mask
1593 sigset_t sigmask = osthread->caller_sigmask();
1594 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1595 }
1596 delete osthread;
1597 }
1599 void os::pd_start_thread(Thread* thread) {
1600 int status = thr_continue(thread->osthread()->thread_id());
1601 assert_status(status == 0, status, "thr_continue failed");
1602 }
1605 intx os::current_thread_id() {
1606 return (intx)thr_self();
1607 }
1609 static pid_t _initial_pid = 0;
1611 int os::current_process_id() {
1612 return (int)(_initial_pid ? _initial_pid : getpid());
1613 }
1615 int os::allocate_thread_local_storage() {
1616 // %%% in Win32 this allocates a memory segment pointed to by a
1617 // register. Dan Stein can implement a similar feature in
1618 // Solaris. Alternatively, the VM can do the same thing
1619 // explicitly: malloc some storage and keep the pointer in a
1620 // register (which is part of the thread's context) (or keep it
1621 // in TLS).
1622 // %%% In current versions of Solaris, thr_self and TSD can
1623 // be accessed via short sequences of displaced indirections.
1624 // The value of thr_self is available as %g7(36).
1625 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1626 // assuming that the current thread already has a value bound to k.
1627 // It may be worth experimenting with such access patterns,
1628 // and later having the parameters formally exported from a Solaris
1629 // interface. I think, however, that it will be faster to
1630 // maintain the invariant that %g2 always contains the
1631 // JavaThread in Java code, and have stubs simply
1632 // treat %g2 as a caller-save register, preserving it in a %lN.
1633 thread_key_t tk;
1634 if (thr_keycreate( &tk, NULL ) )
1635 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1636 "(%s)", strerror(errno)));
1637 return int(tk);
1638 }
1640 void os::free_thread_local_storage(int index) {
1641 // %%% don't think we need anything here
1642 // if ( pthread_key_delete((pthread_key_t) tk) )
1643 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1644 }
1646 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1647 // small number - point is NO swap space available
1648 void os::thread_local_storage_at_put(int index, void* value) {
1649 // %%% this is used only in threadLocalStorage.cpp
1650 if (thr_setspecific((thread_key_t)index, value)) {
1651 if (errno == ENOMEM) {
1652 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space");
1653 } else {
1654 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1655 "(%s)", strerror(errno)));
1656 }
1657 } else {
1658 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ;
1659 }
1660 }
1662 // This function could be called before TLS is initialized, for example, when
1663 // VM receives an async signal or when VM causes a fatal error during
1664 // initialization. Return NULL if thr_getspecific() fails.
1665 void* os::thread_local_storage_at(int index) {
1666 // %%% this is used only in threadLocalStorage.cpp
1667 void* r = NULL;
1668 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1669 }
1672 const int NANOSECS_PER_MILLISECS = 1000000;
1673 // gethrtime can move backwards if read from one cpu and then a different cpu
1674 // getTimeNanos is guaranteed to not move backward on Solaris
1675 // local spinloop created as faster for a CAS on an int than
1676 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not
1677 // supported on sparc v8 or pre supports_cx8 intel boxes.
1678 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong
1679 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes
1680 inline hrtime_t oldgetTimeNanos() {
1681 int gotlock = LOCK_INVALID;
1682 hrtime_t newtime = gethrtime();
1684 for (;;) {
1685 // grab lock for max_hrtime
1686 int curlock = max_hrtime_lock;
1687 if (curlock & LOCK_BUSY) continue;
1688 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue;
1689 if (newtime > max_hrtime) {
1690 max_hrtime = newtime;
1691 } else {
1692 newtime = max_hrtime;
1693 }
1694 // release lock
1695 max_hrtime_lock = LOCK_FREE;
1696 return newtime;
1697 }
1698 }
1699 // gethrtime can move backwards if read from one cpu and then a different cpu
1700 // getTimeNanos is guaranteed to not move backward on Solaris
1701 inline hrtime_t getTimeNanos() {
1702 if (VM_Version::supports_cx8()) {
1703 const hrtime_t now = gethrtime();
1704 // Use atomic long load since 32-bit x86 uses 2 registers to keep long.
1705 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime);
1706 if (now <= prev) return prev; // same or retrograde time;
1707 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1708 assert(obsv >= prev, "invariant"); // Monotonicity
1709 // If the CAS succeeded then we're done and return "now".
1710 // If the CAS failed and the observed value "obs" is >= now then
1711 // we should return "obs". If the CAS failed and now > obs > prv then
1712 // some other thread raced this thread and installed a new value, in which case
1713 // we could either (a) retry the entire operation, (b) retry trying to install now
1714 // or (c) just return obs. We use (c). No loop is required although in some cases
1715 // we might discard a higher "now" value in deference to a slightly lower but freshly
1716 // installed obs value. That's entirely benign -- it admits no new orderings compared
1717 // to (a) or (b) -- and greatly reduces coherence traffic.
1718 // We might also condition (c) on the magnitude of the delta between obs and now.
1719 // Avoiding excessive CAS operations to hot RW locations is critical.
1720 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate
1721 return (prev == obsv) ? now : obsv ;
1722 } else {
1723 return oldgetTimeNanos();
1724 }
1725 }
1727 // Time since start-up in seconds to a fine granularity.
1728 // Used by VMSelfDestructTimer and the MemProfiler.
1729 double os::elapsedTime() {
1730 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1731 }
1733 jlong os::elapsed_counter() {
1734 return (jlong)(getTimeNanos() - first_hrtime);
1735 }
1737 jlong os::elapsed_frequency() {
1738 return hrtime_hz;
1739 }
1741 // Return the real, user, and system times in seconds from an
1742 // arbitrary fixed point in the past.
1743 bool os::getTimesSecs(double* process_real_time,
1744 double* process_user_time,
1745 double* process_system_time) {
1746 struct tms ticks;
1747 clock_t real_ticks = times(&ticks);
1749 if (real_ticks == (clock_t) (-1)) {
1750 return false;
1751 } else {
1752 double ticks_per_second = (double) clock_tics_per_sec;
1753 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1754 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1755 // For consistency return the real time from getTimeNanos()
1756 // converted to seconds.
1757 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1759 return true;
1760 }
1761 }
1763 bool os::supports_vtime() { return true; }
1765 bool os::enable_vtime() {
1766 int fd = ::open("/proc/self/ctl", O_WRONLY);
1767 if (fd == -1)
1768 return false;
1770 long cmd[] = { PCSET, PR_MSACCT };
1771 int res = ::write(fd, cmd, sizeof(long) * 2);
1772 ::close(fd);
1773 if (res != sizeof(long) * 2)
1774 return false;
1776 return true;
1777 }
1779 bool os::vtime_enabled() {
1780 int fd = ::open("/proc/self/status", O_RDONLY);
1781 if (fd == -1)
1782 return false;
1784 pstatus_t status;
1785 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1786 ::close(fd);
1787 if (res != sizeof(pstatus_t))
1788 return false;
1790 return status.pr_flags & PR_MSACCT;
1791 }
1793 double os::elapsedVTime() {
1794 return (double)gethrvtime() / (double)hrtime_hz;
1795 }
1797 // Used internally for comparisons only
1798 // getTimeMillis guaranteed to not move backwards on Solaris
1799 jlong getTimeMillis() {
1800 jlong nanotime = getTimeNanos();
1801 return (jlong)(nanotime / NANOSECS_PER_MILLISECS);
1802 }
1804 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1805 jlong os::javaTimeMillis() {
1806 timeval t;
1807 if (gettimeofday( &t, NULL) == -1)
1808 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1809 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1810 }
1812 jlong os::javaTimeNanos() {
1813 return (jlong)getTimeNanos();
1814 }
1816 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1817 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1818 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1819 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1820 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1821 }
1823 char * os::local_time_string(char *buf, size_t buflen) {
1824 struct tm t;
1825 time_t long_time;
1826 time(&long_time);
1827 localtime_r(&long_time, &t);
1828 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1829 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1830 t.tm_hour, t.tm_min, t.tm_sec);
1831 return buf;
1832 }
1834 // Note: os::shutdown() might be called very early during initialization, or
1835 // called from signal handler. Before adding something to os::shutdown(), make
1836 // sure it is async-safe and can handle partially initialized VM.
1837 void os::shutdown() {
1839 // allow PerfMemory to attempt cleanup of any persistent resources
1840 perfMemory_exit();
1842 // needs to remove object in file system
1843 AttachListener::abort();
1845 // flush buffered output, finish log files
1846 ostream_abort();
1848 // Check for abort hook
1849 abort_hook_t abort_hook = Arguments::abort_hook();
1850 if (abort_hook != NULL) {
1851 abort_hook();
1852 }
1853 }
1855 // Note: os::abort() might be called very early during initialization, or
1856 // called from signal handler. Before adding something to os::abort(), make
1857 // sure it is async-safe and can handle partially initialized VM.
1858 void os::abort(bool dump_core) {
1859 os::shutdown();
1860 if (dump_core) {
1861 #ifndef PRODUCT
1862 fdStream out(defaultStream::output_fd());
1863 out.print_raw("Current thread is ");
1864 char buf[16];
1865 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1866 out.print_raw_cr(buf);
1867 out.print_raw_cr("Dumping core ...");
1868 #endif
1869 ::abort(); // dump core (for debugging)
1870 }
1872 ::exit(1);
1873 }
1875 // Die immediately, no exit hook, no abort hook, no cleanup.
1876 void os::die() {
1877 _exit(-1);
1878 }
1880 // unused
1881 void os::set_error_file(const char *logfile) {}
1883 // DLL functions
1885 const char* os::dll_file_extension() { return ".so"; }
1887 // This must be hard coded because it's the system's temporary
1888 // directory not the java application's temp directory, ala java.io.tmpdir.
1889 const char* os::get_temp_directory() { return "/tmp"; }
1891 static bool file_exists(const char* filename) {
1892 struct stat statbuf;
1893 if (filename == NULL || strlen(filename) == 0) {
1894 return false;
1895 }
1896 return os::stat(filename, &statbuf) == 0;
1897 }
1899 void os::dll_build_name(char* buffer, size_t buflen,
1900 const char* pname, const char* fname) {
1901 const size_t pnamelen = pname ? strlen(pname) : 0;
1903 // Quietly truncate on buffer overflow. Should be an error.
1904 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1905 *buffer = '\0';
1906 return;
1907 }
1909 if (pnamelen == 0) {
1910 snprintf(buffer, buflen, "lib%s.so", fname);
1911 } else if (strchr(pname, *os::path_separator()) != NULL) {
1912 int n;
1913 char** pelements = split_path(pname, &n);
1914 for (int i = 0 ; i < n ; i++) {
1915 // really shouldn't be NULL but what the heck, check can't hurt
1916 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1917 continue; // skip the empty path values
1918 }
1919 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1920 if (file_exists(buffer)) {
1921 break;
1922 }
1923 }
1924 // release the storage
1925 for (int i = 0 ; i < n ; i++) {
1926 if (pelements[i] != NULL) {
1927 FREE_C_HEAP_ARRAY(char, pelements[i]);
1928 }
1929 }
1930 if (pelements != NULL) {
1931 FREE_C_HEAP_ARRAY(char*, pelements);
1932 }
1933 } else {
1934 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1935 }
1936 }
1938 const char* os::get_current_directory(char *buf, int buflen) {
1939 return getcwd(buf, buflen);
1940 }
1942 // check if addr is inside libjvm[_g].so
1943 bool os::address_is_in_vm(address addr) {
1944 static address libjvm_base_addr;
1945 Dl_info dlinfo;
1947 if (libjvm_base_addr == NULL) {
1948 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1949 libjvm_base_addr = (address)dlinfo.dli_fbase;
1950 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1951 }
1953 if (dladdr((void *)addr, &dlinfo)) {
1954 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1955 }
1957 return false;
1958 }
1960 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1961 static dladdr1_func_type dladdr1_func = NULL;
1963 bool os::dll_address_to_function_name(address addr, char *buf,
1964 int buflen, int * offset) {
1965 Dl_info dlinfo;
1967 // dladdr1_func was initialized in os::init()
1968 if (dladdr1_func){
1969 // yes, we have dladdr1
1971 // Support for dladdr1 is checked at runtime; it may be
1972 // available even if the vm is built on a machine that does
1973 // not have dladdr1 support. Make sure there is a value for
1974 // RTLD_DL_SYMENT.
1975 #ifndef RTLD_DL_SYMENT
1976 #define RTLD_DL_SYMENT 1
1977 #endif
1978 #ifdef _LP64
1979 Elf64_Sym * info;
1980 #else
1981 Elf32_Sym * info;
1982 #endif
1983 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1984 RTLD_DL_SYMENT)) {
1985 if ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1986 if (buf != NULL) {
1987 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
1988 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1989 }
1990 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1991 return true;
1992 }
1993 }
1994 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1995 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1996 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) {
1997 return true;
1998 }
1999 }
2000 if (buf != NULL) buf[0] = '\0';
2001 if (offset != NULL) *offset = -1;
2002 return false;
2003 } else {
2004 // no, only dladdr is available
2005 if (dladdr((void *)addr, &dlinfo)) {
2006 if (buf != NULL) {
2007 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
2008 jio_snprintf(buf, buflen, dlinfo.dli_sname);
2009 }
2010 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
2011 return true;
2012 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
2013 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
2014 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) {
2015 return true;
2016 }
2017 }
2018 if (buf != NULL) buf[0] = '\0';
2019 if (offset != NULL) *offset = -1;
2020 return false;
2021 }
2022 }
2024 bool os::dll_address_to_library_name(address addr, char* buf,
2025 int buflen, int* offset) {
2026 Dl_info dlinfo;
2028 if (dladdr((void*)addr, &dlinfo)){
2029 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
2030 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
2031 return true;
2032 } else {
2033 if (buf) buf[0] = '\0';
2034 if (offset) *offset = -1;
2035 return false;
2036 }
2037 }
2039 // Prints the names and full paths of all opened dynamic libraries
2040 // for current process
2041 void os::print_dll_info(outputStream * st) {
2042 Dl_info dli;
2043 void *handle;
2044 Link_map *map;
2045 Link_map *p;
2047 st->print_cr("Dynamic libraries:"); st->flush();
2049 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
2050 st->print_cr("Error: Cannot print dynamic libraries.");
2051 return;
2052 }
2053 handle = dlopen(dli.dli_fname, RTLD_LAZY);
2054 if (handle == NULL) {
2055 st->print_cr("Error: Cannot print dynamic libraries.");
2056 return;
2057 }
2058 dlinfo(handle, RTLD_DI_LINKMAP, &map);
2059 if (map == NULL) {
2060 st->print_cr("Error: Cannot print dynamic libraries.");
2061 return;
2062 }
2064 while (map->l_prev != NULL)
2065 map = map->l_prev;
2067 while (map != NULL) {
2068 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2069 map = map->l_next;
2070 }
2072 dlclose(handle);
2073 }
2075 // Loads .dll/.so and
2076 // in case of error it checks if .dll/.so was built for the
2077 // same architecture as Hotspot is running on
2079 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2080 {
2081 void * result= ::dlopen(filename, RTLD_LAZY);
2082 if (result != NULL) {
2083 // Successful loading
2084 return result;
2085 }
2087 Elf32_Ehdr elf_head;
2089 // Read system error message into ebuf
2090 // It may or may not be overwritten below
2091 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2092 ebuf[ebuflen-1]='\0';
2093 int diag_msg_max_length=ebuflen-strlen(ebuf);
2094 char* diag_msg_buf=ebuf+strlen(ebuf);
2096 if (diag_msg_max_length==0) {
2097 // No more space in ebuf for additional diagnostics message
2098 return NULL;
2099 }
2102 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2104 if (file_descriptor < 0) {
2105 // Can't open library, report dlerror() message
2106 return NULL;
2107 }
2109 bool failed_to_read_elf_head=
2110 (sizeof(elf_head)!=
2111 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2113 ::close(file_descriptor);
2114 if (failed_to_read_elf_head) {
2115 // file i/o error - report dlerror() msg
2116 return NULL;
2117 }
2119 typedef struct {
2120 Elf32_Half code; // Actual value as defined in elf.h
2121 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2122 char elf_class; // 32 or 64 bit
2123 char endianess; // MSB or LSB
2124 char* name; // String representation
2125 } arch_t;
2127 static const arch_t arch_array[]={
2128 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2129 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2130 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2131 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2132 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2133 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2134 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2135 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2136 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2137 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2138 };
2140 #if (defined IA32)
2141 static Elf32_Half running_arch_code=EM_386;
2142 #elif (defined AMD64)
2143 static Elf32_Half running_arch_code=EM_X86_64;
2144 #elif (defined IA64)
2145 static Elf32_Half running_arch_code=EM_IA_64;
2146 #elif (defined __sparc) && (defined _LP64)
2147 static Elf32_Half running_arch_code=EM_SPARCV9;
2148 #elif (defined __sparc) && (!defined _LP64)
2149 static Elf32_Half running_arch_code=EM_SPARC;
2150 #elif (defined __powerpc64__)
2151 static Elf32_Half running_arch_code=EM_PPC64;
2152 #elif (defined __powerpc__)
2153 static Elf32_Half running_arch_code=EM_PPC;
2154 #elif (defined ARM)
2155 static Elf32_Half running_arch_code=EM_ARM;
2156 #else
2157 #error Method os::dll_load requires that one of following is defined:\
2158 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2159 #endif
2161 // Identify compatability class for VM's architecture and library's architecture
2162 // Obtain string descriptions for architectures
2164 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2165 int running_arch_index=-1;
2167 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2168 if (running_arch_code == arch_array[i].code) {
2169 running_arch_index = i;
2170 }
2171 if (lib_arch.code == arch_array[i].code) {
2172 lib_arch.compat_class = arch_array[i].compat_class;
2173 lib_arch.name = arch_array[i].name;
2174 }
2175 }
2177 assert(running_arch_index != -1,
2178 "Didn't find running architecture code (running_arch_code) in arch_array");
2179 if (running_arch_index == -1) {
2180 // Even though running architecture detection failed
2181 // we may still continue with reporting dlerror() message
2182 return NULL;
2183 }
2185 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2186 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2187 return NULL;
2188 }
2190 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2191 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2192 return NULL;
2193 }
2195 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2196 if ( lib_arch.name!=NULL ) {
2197 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2198 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2199 lib_arch.name, arch_array[running_arch_index].name);
2200 } else {
2201 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2202 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2203 lib_arch.code,
2204 arch_array[running_arch_index].name);
2205 }
2206 }
2208 return NULL;
2209 }
2211 void* os::dll_lookup(void* handle, const char* name) {
2212 return dlsym(handle, name);
2213 }
2215 int os::stat(const char *path, struct stat *sbuf) {
2216 char pathbuf[MAX_PATH];
2217 if (strlen(path) > MAX_PATH - 1) {
2218 errno = ENAMETOOLONG;
2219 return -1;
2220 }
2221 os::native_path(strcpy(pathbuf, path));
2222 return ::stat(pathbuf, sbuf);
2223 }
2225 static bool _print_ascii_file(const char* filename, outputStream* st) {
2226 int fd = ::open(filename, O_RDONLY);
2227 if (fd == -1) {
2228 return false;
2229 }
2231 char buf[32];
2232 int bytes;
2233 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2234 st->print_raw(buf, bytes);
2235 }
2237 ::close(fd);
2239 return true;
2240 }
2242 void os::print_os_info(outputStream* st) {
2243 st->print("OS:");
2245 if (!_print_ascii_file("/etc/release", st)) {
2246 st->print("Solaris");
2247 }
2248 st->cr();
2250 // kernel
2251 st->print("uname:");
2252 struct utsname name;
2253 uname(&name);
2254 st->print(name.sysname); st->print(" ");
2255 st->print(name.release); st->print(" ");
2256 st->print(name.version); st->print(" ");
2257 st->print(name.machine);
2259 // libthread
2260 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)");
2261 else st->print(" (T1 libthread)");
2262 st->cr();
2264 // rlimit
2265 st->print("rlimit:");
2266 struct rlimit rlim;
2268 st->print(" STACK ");
2269 getrlimit(RLIMIT_STACK, &rlim);
2270 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2271 else st->print("%uk", rlim.rlim_cur >> 10);
2273 st->print(", CORE ");
2274 getrlimit(RLIMIT_CORE, &rlim);
2275 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2276 else st->print("%uk", rlim.rlim_cur >> 10);
2278 st->print(", NOFILE ");
2279 getrlimit(RLIMIT_NOFILE, &rlim);
2280 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2281 else st->print("%d", rlim.rlim_cur);
2283 st->print(", AS ");
2284 getrlimit(RLIMIT_AS, &rlim);
2285 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2286 else st->print("%uk", rlim.rlim_cur >> 10);
2287 st->cr();
2289 // load average
2290 st->print("load average:");
2291 double loadavg[3];
2292 os::loadavg(loadavg, 3);
2293 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
2294 st->cr();
2295 }
2298 static bool check_addr0(outputStream* st) {
2299 jboolean status = false;
2300 int fd = ::open("/proc/self/map",O_RDONLY);
2301 if (fd >= 0) {
2302 prmap_t p;
2303 while(::read(fd, &p, sizeof(p)) > 0) {
2304 if (p.pr_vaddr == 0x0) {
2305 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2306 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2307 st->print("Access:");
2308 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2309 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2310 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2311 st->cr();
2312 status = true;
2313 }
2314 ::close(fd);
2315 }
2316 }
2317 return status;
2318 }
2320 void os::print_memory_info(outputStream* st) {
2321 st->print("Memory:");
2322 st->print(" %dk page", os::vm_page_size()>>10);
2323 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2324 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2325 st->cr();
2326 (void) check_addr0(st);
2327 }
2329 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2330 // but they're the same for all the solaris architectures that we support.
2331 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2332 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2333 "ILL_COPROC", "ILL_BADSTK" };
2335 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2336 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2337 "FPE_FLTINV", "FPE_FLTSUB" };
2339 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2341 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2343 void os::print_siginfo(outputStream* st, void* siginfo) {
2344 st->print("siginfo:");
2346 const int buflen = 100;
2347 char buf[buflen];
2348 siginfo_t *si = (siginfo_t*)siginfo;
2349 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2350 char *err = strerror(si->si_errno);
2351 if (si->si_errno != 0 && err != NULL) {
2352 st->print("si_errno=%s", err);
2353 } else {
2354 st->print("si_errno=%d", si->si_errno);
2355 }
2356 const int c = si->si_code;
2357 assert(c > 0, "unexpected si_code");
2358 switch (si->si_signo) {
2359 case SIGILL:
2360 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2361 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2362 break;
2363 case SIGFPE:
2364 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2365 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2366 break;
2367 case SIGSEGV:
2368 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2369 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2370 break;
2371 case SIGBUS:
2372 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2373 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2374 break;
2375 default:
2376 st->print(", si_code=%d", si->si_code);
2377 // no si_addr
2378 }
2380 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2381 UseSharedSpaces) {
2382 FileMapInfo* mapinfo = FileMapInfo::current_info();
2383 if (mapinfo->is_in_shared_space(si->si_addr)) {
2384 st->print("\n\nError accessing class data sharing archive." \
2385 " Mapped file inaccessible during execution, " \
2386 " possible disk/network problem.");
2387 }
2388 }
2389 st->cr();
2390 }
2392 // Moved from whole group, because we need them here for diagnostic
2393 // prints.
2394 #define OLDMAXSIGNUM 32
2395 static int Maxsignum = 0;
2396 static int *ourSigFlags = NULL;
2398 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2400 int os::Solaris::get_our_sigflags(int sig) {
2401 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2402 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2403 return ourSigFlags[sig];
2404 }
2406 void os::Solaris::set_our_sigflags(int sig, int flags) {
2407 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2408 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2409 ourSigFlags[sig] = flags;
2410 }
2413 static const char* get_signal_handler_name(address handler,
2414 char* buf, int buflen) {
2415 int offset;
2416 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2417 if (found) {
2418 // skip directory names
2419 const char *p1, *p2;
2420 p1 = buf;
2421 size_t len = strlen(os::file_separator());
2422 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2423 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2424 } else {
2425 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2426 }
2427 return buf;
2428 }
2430 static void print_signal_handler(outputStream* st, int sig,
2431 char* buf, size_t buflen) {
2432 struct sigaction sa;
2434 sigaction(sig, NULL, &sa);
2436 st->print("%s: ", os::exception_name(sig, buf, buflen));
2438 address handler = (sa.sa_flags & SA_SIGINFO)
2439 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2440 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2442 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2443 st->print("SIG_DFL");
2444 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2445 st->print("SIG_IGN");
2446 } else {
2447 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2448 }
2450 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2452 address rh = VMError::get_resetted_sighandler(sig);
2453 // May be, handler was resetted by VMError?
2454 if(rh != NULL) {
2455 handler = rh;
2456 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2457 }
2459 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2461 // Check: is it our handler?
2462 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2463 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2464 // It is our signal handler
2465 // check for flags
2466 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2467 st->print(
2468 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2469 os::Solaris::get_our_sigflags(sig));
2470 }
2471 }
2472 st->cr();
2473 }
2475 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2476 st->print_cr("Signal Handlers:");
2477 print_signal_handler(st, SIGSEGV, buf, buflen);
2478 print_signal_handler(st, SIGBUS , buf, buflen);
2479 print_signal_handler(st, SIGFPE , buf, buflen);
2480 print_signal_handler(st, SIGPIPE, buf, buflen);
2481 print_signal_handler(st, SIGXFSZ, buf, buflen);
2482 print_signal_handler(st, SIGILL , buf, buflen);
2483 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2484 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2485 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2486 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2487 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2488 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2489 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2490 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2491 }
2493 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2495 // Find the full path to the current module, libjvm.so or libjvm_g.so
2496 void os::jvm_path(char *buf, jint buflen) {
2497 // Error checking.
2498 if (buflen < MAXPATHLEN) {
2499 assert(false, "must use a large-enough buffer");
2500 buf[0] = '\0';
2501 return;
2502 }
2503 // Lazy resolve the path to current module.
2504 if (saved_jvm_path[0] != 0) {
2505 strcpy(buf, saved_jvm_path);
2506 return;
2507 }
2509 Dl_info dlinfo;
2510 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2511 assert(ret != 0, "cannot locate libjvm");
2512 realpath((char *)dlinfo.dli_fname, buf);
2514 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) {
2515 // Support for the gamma launcher. Typical value for buf is
2516 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2517 // the right place in the string, then assume we are installed in a JDK and
2518 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2519 // up the path so it looks like libjvm.so is installed there (append a
2520 // fake suffix hotspot/libjvm.so).
2521 const char *p = buf + strlen(buf) - 1;
2522 for (int count = 0; p > buf && count < 5; ++count) {
2523 for (--p; p > buf && *p != '/'; --p)
2524 /* empty */ ;
2525 }
2527 if (strncmp(p, "/jre/lib/", 9) != 0) {
2528 // Look for JAVA_HOME in the environment.
2529 char* java_home_var = ::getenv("JAVA_HOME");
2530 if (java_home_var != NULL && java_home_var[0] != 0) {
2531 char cpu_arch[12];
2532 char* jrelib_p;
2533 int len;
2534 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2535 #ifdef _LP64
2536 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2537 if (strcmp(cpu_arch, "sparc") == 0) {
2538 strcat(cpu_arch, "v9");
2539 } else if (strcmp(cpu_arch, "i386") == 0) {
2540 strcpy(cpu_arch, "amd64");
2541 }
2542 #endif
2543 // Check the current module name "libjvm.so" or "libjvm_g.so".
2544 p = strrchr(buf, '/');
2545 assert(strstr(p, "/libjvm") == p, "invalid library name");
2546 p = strstr(p, "_g") ? "_g" : "";
2548 realpath(java_home_var, buf);
2549 // determine if this is a legacy image or modules image
2550 // modules image doesn't have "jre" subdirectory
2551 len = strlen(buf);
2552 jrelib_p = buf + len;
2553 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2554 if (0 != access(buf, F_OK)) {
2555 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2556 }
2558 if (0 == access(buf, F_OK)) {
2559 // Use current module name "libjvm[_g].so" instead of
2560 // "libjvm"debug_only("_g")".so" since for fastdebug version
2561 // we should have "libjvm.so" but debug_only("_g") adds "_g"!
2562 len = strlen(buf);
2563 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p);
2564 } else {
2565 // Go back to path of .so
2566 realpath((char *)dlinfo.dli_fname, buf);
2567 }
2568 }
2569 }
2570 }
2572 strcpy(saved_jvm_path, buf);
2573 }
2576 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2577 // no prefix required, not even "_"
2578 }
2581 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2582 // no suffix required
2583 }
2585 // This method is a copy of JDK's sysGetLastErrorString
2586 // from src/solaris/hpi/src/system_md.c
2588 size_t os::lasterror(char *buf, size_t len) {
2590 if (errno == 0) return 0;
2592 const char *s = ::strerror(errno);
2593 size_t n = ::strlen(s);
2594 if (n >= len) {
2595 n = len - 1;
2596 }
2597 ::strncpy(buf, s, n);
2598 buf[n] = '\0';
2599 return n;
2600 }
2603 // sun.misc.Signal
2605 extern "C" {
2606 static void UserHandler(int sig, void *siginfo, void *context) {
2607 // Ctrl-C is pressed during error reporting, likely because the error
2608 // handler fails to abort. Let VM die immediately.
2609 if (sig == SIGINT && is_error_reported()) {
2610 os::die();
2611 }
2613 os::signal_notify(sig);
2614 // We do not need to reinstate the signal handler each time...
2615 }
2616 }
2618 void* os::user_handler() {
2619 return CAST_FROM_FN_PTR(void*, UserHandler);
2620 }
2622 extern "C" {
2623 typedef void (*sa_handler_t)(int);
2624 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2625 }
2627 void* os::signal(int signal_number, void* handler) {
2628 struct sigaction sigAct, oldSigAct;
2629 sigfillset(&(sigAct.sa_mask));
2630 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2631 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2633 if (sigaction(signal_number, &sigAct, &oldSigAct))
2634 // -1 means registration failed
2635 return (void *)-1;
2637 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2638 }
2640 void os::signal_raise(int signal_number) {
2641 raise(signal_number);
2642 }
2644 /*
2645 * The following code is moved from os.cpp for making this
2646 * code platform specific, which it is by its very nature.
2647 */
2649 // a counter for each possible signal value
2650 static int Sigexit = 0;
2651 static int Maxlibjsigsigs;
2652 static jint *pending_signals = NULL;
2653 static int *preinstalled_sigs = NULL;
2654 static struct sigaction *chainedsigactions = NULL;
2655 static sema_t sig_sem;
2656 typedef int (*version_getting_t)();
2657 version_getting_t os::Solaris::get_libjsig_version = NULL;
2658 static int libjsigversion = NULL;
2660 int os::sigexitnum_pd() {
2661 assert(Sigexit > 0, "signal memory not yet initialized");
2662 return Sigexit;
2663 }
2665 void os::Solaris::init_signal_mem() {
2666 // Initialize signal structures
2667 Maxsignum = SIGRTMAX;
2668 Sigexit = Maxsignum+1;
2669 assert(Maxsignum >0, "Unable to obtain max signal number");
2671 Maxlibjsigsigs = Maxsignum;
2673 // pending_signals has one int per signal
2674 // The additional signal is for SIGEXIT - exit signal to signal_thread
2675 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1));
2676 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2678 if (UseSignalChaining) {
2679 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2680 * (Maxsignum + 1));
2681 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2682 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1));
2683 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2684 }
2685 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ));
2686 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2687 }
2689 void os::signal_init_pd() {
2690 int ret;
2692 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2693 assert(ret == 0, "sema_init() failed");
2694 }
2696 void os::signal_notify(int signal_number) {
2697 int ret;
2699 Atomic::inc(&pending_signals[signal_number]);
2700 ret = ::sema_post(&sig_sem);
2701 assert(ret == 0, "sema_post() failed");
2702 }
2704 static int check_pending_signals(bool wait_for_signal) {
2705 int ret;
2706 while (true) {
2707 for (int i = 0; i < Sigexit + 1; i++) {
2708 jint n = pending_signals[i];
2709 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2710 return i;
2711 }
2712 }
2713 if (!wait_for_signal) {
2714 return -1;
2715 }
2716 JavaThread *thread = JavaThread::current();
2717 ThreadBlockInVM tbivm(thread);
2719 bool threadIsSuspended;
2720 do {
2721 thread->set_suspend_equivalent();
2722 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2723 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2724 ;
2725 assert(ret == 0, "sema_wait() failed");
2727 // were we externally suspended while we were waiting?
2728 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2729 if (threadIsSuspended) {
2730 //
2731 // The semaphore has been incremented, but while we were waiting
2732 // another thread suspended us. We don't want to continue running
2733 // while suspended because that would surprise the thread that
2734 // suspended us.
2735 //
2736 ret = ::sema_post(&sig_sem);
2737 assert(ret == 0, "sema_post() failed");
2739 thread->java_suspend_self();
2740 }
2741 } while (threadIsSuspended);
2742 }
2743 }
2745 int os::signal_lookup() {
2746 return check_pending_signals(false);
2747 }
2749 int os::signal_wait() {
2750 return check_pending_signals(true);
2751 }
2753 ////////////////////////////////////////////////////////////////////////////////
2754 // Virtual Memory
2756 static int page_size = -1;
2758 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2759 // clear this var if support is not available.
2760 static bool has_map_align = true;
2762 int os::vm_page_size() {
2763 assert(page_size != -1, "must call os::init");
2764 return page_size;
2765 }
2767 // Solaris allocates memory by pages.
2768 int os::vm_allocation_granularity() {
2769 assert(page_size != -1, "must call os::init");
2770 return page_size;
2771 }
2773 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2774 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2775 size_t size = bytes;
2776 return
2777 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2778 }
2780 bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2781 bool exec) {
2782 if (commit_memory(addr, bytes, exec)) {
2783 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2784 // If the large page size has been set and the VM
2785 // is using large pages, use the large page size
2786 // if it is smaller than the alignment hint. This is
2787 // a case where the VM wants to use a larger alignment size
2788 // for its own reasons but still want to use large pages
2789 // (which is what matters to setting the mpss range.
2790 size_t page_size = 0;
2791 if (large_page_size() < alignment_hint) {
2792 assert(UseLargePages, "Expected to be here for large page use only");
2793 page_size = large_page_size();
2794 } else {
2795 // If the alignment hint is less than the large page
2796 // size, the VM wants a particular alignment (thus the hint)
2797 // for internal reasons. Try to set the mpss range using
2798 // the alignment_hint.
2799 page_size = alignment_hint;
2800 }
2801 // Since this is a hint, ignore any failures.
2802 (void)Solaris::set_mpss_range(addr, bytes, page_size);
2803 }
2804 return true;
2805 }
2806 return false;
2807 }
2809 // Uncommit the pages in a specified region.
2810 void os::free_memory(char* addr, size_t bytes) {
2811 if (madvise(addr, bytes, MADV_FREE) < 0) {
2812 debug_only(warning("MADV_FREE failed."));
2813 return;
2814 }
2815 }
2817 bool os::create_stack_guard_pages(char* addr, size_t size) {
2818 return os::commit_memory(addr, size);
2819 }
2821 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2822 return os::uncommit_memory(addr, size);
2823 }
2825 // Change the page size in a given range.
2826 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2827 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2828 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2829 Solaris::set_mpss_range(addr, bytes, alignment_hint);
2830 }
2832 // Tell the OS to make the range local to the first-touching LWP
2833 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2834 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2835 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2836 debug_only(warning("MADV_ACCESS_LWP failed."));
2837 }
2838 }
2840 // Tell the OS that this range would be accessed from different LWPs.
2841 void os::numa_make_global(char *addr, size_t bytes) {
2842 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2843 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2844 debug_only(warning("MADV_ACCESS_MANY failed."));
2845 }
2846 }
2848 // Get the number of the locality groups.
2849 size_t os::numa_get_groups_num() {
2850 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2851 return n != -1 ? n : 1;
2852 }
2854 // Get a list of leaf locality groups. A leaf lgroup is group that
2855 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2856 // board. An LWP is assigned to one of these groups upon creation.
2857 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2858 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2859 ids[0] = 0;
2860 return 1;
2861 }
2862 int result_size = 0, top = 1, bottom = 0, cur = 0;
2863 for (int k = 0; k < size; k++) {
2864 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2865 (Solaris::lgrp_id_t*)&ids[top], size - top);
2866 if (r == -1) {
2867 ids[0] = 0;
2868 return 1;
2869 }
2870 if (!r) {
2871 // That's a leaf node.
2872 assert (bottom <= cur, "Sanity check");
2873 // Check if the node has memory
2874 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2875 NULL, 0, LGRP_RSRC_MEM) > 0) {
2876 ids[bottom++] = ids[cur];
2877 }
2878 }
2879 top += r;
2880 cur++;
2881 }
2882 if (bottom == 0) {
2883 // Handle a situation, when the OS reports no memory available.
2884 // Assume UMA architecture.
2885 ids[0] = 0;
2886 return 1;
2887 }
2888 return bottom;
2889 }
2891 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2892 bool os::numa_topology_changed() {
2893 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2894 if (is_stale != -1 && is_stale) {
2895 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2896 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2897 assert(c != 0, "Failure to initialize LGRP API");
2898 Solaris::set_lgrp_cookie(c);
2899 return true;
2900 }
2901 return false;
2902 }
2904 // Get the group id of the current LWP.
2905 int os::numa_get_group_id() {
2906 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2907 if (lgrp_id == -1) {
2908 return 0;
2909 }
2910 const int size = os::numa_get_groups_num();
2911 int *ids = (int*)alloca(size * sizeof(int));
2913 // Get the ids of all lgroups with memory; r is the count.
2914 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2915 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2916 if (r <= 0) {
2917 return 0;
2918 }
2919 return ids[os::random() % r];
2920 }
2922 // Request information about the page.
2923 bool os::get_page_info(char *start, page_info* info) {
2924 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2925 uint64_t addr = (uintptr_t)start;
2926 uint64_t outdata[2];
2927 uint_t validity = 0;
2929 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2930 return false;
2931 }
2933 info->size = 0;
2934 info->lgrp_id = -1;
2936 if ((validity & 1) != 0) {
2937 if ((validity & 2) != 0) {
2938 info->lgrp_id = outdata[0];
2939 }
2940 if ((validity & 4) != 0) {
2941 info->size = outdata[1];
2942 }
2943 return true;
2944 }
2945 return false;
2946 }
2948 // Scan the pages from start to end until a page different than
2949 // the one described in the info parameter is encountered.
2950 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2951 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2952 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2953 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2954 uint_t validity[MAX_MEMINFO_CNT];
2956 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2957 uint64_t p = (uint64_t)start;
2958 while (p < (uint64_t)end) {
2959 addrs[0] = p;
2960 size_t addrs_count = 1;
2961 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) {
2962 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2963 addrs_count++;
2964 }
2966 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2967 return NULL;
2968 }
2970 size_t i = 0;
2971 for (; i < addrs_count; i++) {
2972 if ((validity[i] & 1) != 0) {
2973 if ((validity[i] & 4) != 0) {
2974 if (outdata[types * i + 1] != page_expected->size) {
2975 break;
2976 }
2977 } else
2978 if (page_expected->size != 0) {
2979 break;
2980 }
2982 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2983 if (outdata[types * i] != page_expected->lgrp_id) {
2984 break;
2985 }
2986 }
2987 } else {
2988 return NULL;
2989 }
2990 }
2992 if (i != addrs_count) {
2993 if ((validity[i] & 2) != 0) {
2994 page_found->lgrp_id = outdata[types * i];
2995 } else {
2996 page_found->lgrp_id = -1;
2997 }
2998 if ((validity[i] & 4) != 0) {
2999 page_found->size = outdata[types * i + 1];
3000 } else {
3001 page_found->size = 0;
3002 }
3003 return (char*)addrs[i];
3004 }
3006 p = addrs[addrs_count - 1] + page_size;
3007 }
3008 return end;
3009 }
3011 bool os::uncommit_memory(char* addr, size_t bytes) {
3012 size_t size = bytes;
3013 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3014 // uncommitted page. Otherwise, the read/write might succeed if we
3015 // have enough swap space to back the physical page.
3016 return
3017 NULL != Solaris::mmap_chunk(addr, size,
3018 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
3019 PROT_NONE);
3020 }
3022 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
3023 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
3025 if (b == MAP_FAILED) {
3026 return NULL;
3027 }
3028 return b;
3029 }
3031 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3032 char* addr = requested_addr;
3033 int flags = MAP_PRIVATE | MAP_NORESERVE;
3035 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3037 if (fixed) {
3038 flags |= MAP_FIXED;
3039 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3040 flags |= MAP_ALIGN;
3041 addr = (char*) alignment_hint;
3042 }
3044 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3045 // uncommitted page. Otherwise, the read/write might succeed if we
3046 // have enough swap space to back the physical page.
3047 return mmap_chunk(addr, bytes, flags, PROT_NONE);
3048 }
3050 char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3051 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3053 guarantee(requested_addr == NULL || requested_addr == addr,
3054 "OS failed to return requested mmap address.");
3055 return addr;
3056 }
3058 // Reserve memory at an arbitrary address, only if that area is
3059 // available (and not reserved for something else).
3061 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3062 const int max_tries = 10;
3063 char* base[max_tries];
3064 size_t size[max_tries];
3066 // Solaris adds a gap between mmap'ed regions. The size of the gap
3067 // is dependent on the requested size and the MMU. Our initial gap
3068 // value here is just a guess and will be corrected later.
3069 bool had_top_overlap = false;
3070 bool have_adjusted_gap = false;
3071 size_t gap = 0x400000;
3073 // Assert only that the size is a multiple of the page size, since
3074 // that's all that mmap requires, and since that's all we really know
3075 // about at this low abstraction level. If we need higher alignment,
3076 // we can either pass an alignment to this method or verify alignment
3077 // in one of the methods further up the call chain. See bug 5044738.
3078 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3080 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3081 // Give it a try, if the kernel honors the hint we can return immediately.
3082 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3083 volatile int err = errno;
3084 if (addr == requested_addr) {
3085 return addr;
3086 } else if (addr != NULL) {
3087 unmap_memory(addr, bytes);
3088 }
3090 if (PrintMiscellaneous && Verbose) {
3091 char buf[256];
3092 buf[0] = '\0';
3093 if (addr == NULL) {
3094 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3095 }
3096 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3097 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3098 "%s", bytes, requested_addr, addr, buf);
3099 }
3101 // Address hint method didn't work. Fall back to the old method.
3102 // In theory, once SNV becomes our oldest supported platform, this
3103 // code will no longer be needed.
3104 //
3105 // Repeatedly allocate blocks until the block is allocated at the
3106 // right spot. Give up after max_tries.
3107 int i;
3108 for (i = 0; i < max_tries; ++i) {
3109 base[i] = reserve_memory(bytes);
3111 if (base[i] != NULL) {
3112 // Is this the block we wanted?
3113 if (base[i] == requested_addr) {
3114 size[i] = bytes;
3115 break;
3116 }
3118 // check that the gap value is right
3119 if (had_top_overlap && !have_adjusted_gap) {
3120 size_t actual_gap = base[i-1] - base[i] - bytes;
3121 if (gap != actual_gap) {
3122 // adjust the gap value and retry the last 2 allocations
3123 assert(i > 0, "gap adjustment code problem");
3124 have_adjusted_gap = true; // adjust the gap only once, just in case
3125 gap = actual_gap;
3126 if (PrintMiscellaneous && Verbose) {
3127 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3128 }
3129 unmap_memory(base[i], bytes);
3130 unmap_memory(base[i-1], size[i-1]);
3131 i-=2;
3132 continue;
3133 }
3134 }
3136 // Does this overlap the block we wanted? Give back the overlapped
3137 // parts and try again.
3138 //
3139 // There is still a bug in this code: if top_overlap == bytes,
3140 // the overlap is offset from requested region by the value of gap.
3141 // In this case giving back the overlapped part will not work,
3142 // because we'll give back the entire block at base[i] and
3143 // therefore the subsequent allocation will not generate a new gap.
3144 // This could be fixed with a new algorithm that used larger
3145 // or variable size chunks to find the requested region -
3146 // but such a change would introduce additional complications.
3147 // It's rare enough that the planets align for this bug,
3148 // so we'll just wait for a fix for 6204603/5003415 which
3149 // will provide a mmap flag to allow us to avoid this business.
3151 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3152 if (top_overlap >= 0 && top_overlap < bytes) {
3153 had_top_overlap = true;
3154 unmap_memory(base[i], top_overlap);
3155 base[i] += top_overlap;
3156 size[i] = bytes - top_overlap;
3157 } else {
3158 size_t bottom_overlap = base[i] + bytes - requested_addr;
3159 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3160 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3161 warning("attempt_reserve_memory_at: possible alignment bug");
3162 }
3163 unmap_memory(requested_addr, bottom_overlap);
3164 size[i] = bytes - bottom_overlap;
3165 } else {
3166 size[i] = bytes;
3167 }
3168 }
3169 }
3170 }
3172 // Give back the unused reserved pieces.
3174 for (int j = 0; j < i; ++j) {
3175 if (base[j] != NULL) {
3176 unmap_memory(base[j], size[j]);
3177 }
3178 }
3180 return (i < max_tries) ? requested_addr : NULL;
3181 }
3183 bool os::release_memory(char* addr, size_t bytes) {
3184 size_t size = bytes;
3185 return munmap(addr, size) == 0;
3186 }
3188 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3189 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3190 "addr must be page aligned");
3191 int retVal = mprotect(addr, bytes, prot);
3192 return retVal == 0;
3193 }
3195 // Protect memory (Used to pass readonly pages through
3196 // JNI GetArray<type>Elements with empty arrays.)
3197 // Also, used for serialization page and for compressed oops null pointer
3198 // checking.
3199 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3200 bool is_committed) {
3201 unsigned int p = 0;
3202 switch (prot) {
3203 case MEM_PROT_NONE: p = PROT_NONE; break;
3204 case MEM_PROT_READ: p = PROT_READ; break;
3205 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3206 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3207 default:
3208 ShouldNotReachHere();
3209 }
3210 // is_committed is unused.
3211 return solaris_mprotect(addr, bytes, p);
3212 }
3214 // guard_memory and unguard_memory only happens within stack guard pages.
3215 // Since ISM pertains only to the heap, guard and unguard memory should not
3216 /// happen with an ISM region.
3217 bool os::guard_memory(char* addr, size_t bytes) {
3218 return solaris_mprotect(addr, bytes, PROT_NONE);
3219 }
3221 bool os::unguard_memory(char* addr, size_t bytes) {
3222 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3223 }
3225 // Large page support
3227 // UseLargePages is the master flag to enable/disable large page memory.
3228 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3229 // effects can be described in the following table:
3230 //
3231 // UseLargePages UseMPSS UseISM
3232 // false * * => UseLargePages is the master switch, turning
3233 // it off will turn off both UseMPSS and
3234 // UseISM. VM will not use large page memory
3235 // regardless the settings of UseMPSS/UseISM.
3236 // true false false => Unless future Solaris provides other
3237 // mechanism to use large page memory, this
3238 // combination is equivalent to -UseLargePages,
3239 // VM will not use large page memory
3240 // true true false => JVM will use MPSS for large page memory.
3241 // This is the default behavior.
3242 // true false true => JVM will use ISM for large page memory.
3243 // true true true => JVM will use ISM if it is available.
3244 // Otherwise, JVM will fall back to MPSS.
3245 // Becaues ISM is now available on all
3246 // supported Solaris versions, this combination
3247 // is equivalent to +UseISM -UseMPSS.
3249 typedef int (*getpagesizes_func_type) (size_t[], int);
3250 static size_t _large_page_size = 0;
3252 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3253 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3254 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3255 // can support multiple page sizes.
3257 // Don't bother to probe page size because getpagesizes() comes with MPSS.
3258 // ISM is only recommended on old Solaris where there is no MPSS support.
3259 // Simply choose a conservative value as default.
3260 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3261 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M)
3262 ARM_ONLY(2 * M);
3264 // ISM is available on all supported Solaris versions
3265 return true;
3266 }
3268 // Insertion sort for small arrays (descending order).
3269 static void insertion_sort_descending(size_t* array, int len) {
3270 for (int i = 0; i < len; i++) {
3271 size_t val = array[i];
3272 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3273 size_t tmp = array[key];
3274 array[key] = array[key - 1];
3275 array[key - 1] = tmp;
3276 }
3277 }
3278 }
3280 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3281 getpagesizes_func_type getpagesizes_func =
3282 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes"));
3283 if (getpagesizes_func == NULL) {
3284 if (warn) {
3285 warning("MPSS is not supported by the operating system.");
3286 }
3287 return false;
3288 }
3290 const unsigned int usable_count = VM_Version::page_size_count();
3291 if (usable_count == 1) {
3292 return false;
3293 }
3295 // Fill the array of page sizes.
3296 int n = getpagesizes_func(_page_sizes, page_sizes_max);
3297 assert(n > 0, "Solaris bug?");
3298 if (n == page_sizes_max) {
3299 // Add a sentinel value (necessary only if the array was completely filled
3300 // since it is static (zeroed at initialization)).
3301 _page_sizes[--n] = 0;
3302 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3303 }
3304 assert(_page_sizes[n] == 0, "missing sentinel");
3306 if (n == 1) return false; // Only one page size available.
3308 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3309 // select up to usable_count elements. First sort the array, find the first
3310 // acceptable value, then copy the usable sizes to the top of the array and
3311 // trim the rest. Make sure to include the default page size :-).
3312 //
3313 // A better policy could get rid of the 4M limit by taking the sizes of the
3314 // important VM memory regions (java heap and possibly the code cache) into
3315 // account.
3316 insertion_sort_descending(_page_sizes, n);
3317 const size_t size_limit =
3318 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3319 int beg;
3320 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3321 const int end = MIN2((int)usable_count, n) - 1;
3322 for (int cur = 0; cur < end; ++cur, ++beg) {
3323 _page_sizes[cur] = _page_sizes[beg];
3324 }
3325 _page_sizes[end] = vm_page_size();
3326 _page_sizes[end + 1] = 0;
3328 if (_page_sizes[end] > _page_sizes[end - 1]) {
3329 // Default page size is not the smallest; sort again.
3330 insertion_sort_descending(_page_sizes, end + 1);
3331 }
3332 *page_size = _page_sizes[0];
3334 return true;
3335 }
3337 bool os::large_page_init() {
3338 if (!UseLargePages) {
3339 UseISM = false;
3340 UseMPSS = false;
3341 return false;
3342 }
3344 // print a warning if any large page related flag is specified on command line
3345 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3346 !FLAG_IS_DEFAULT(UseISM) ||
3347 !FLAG_IS_DEFAULT(UseMPSS) ||
3348 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3349 UseISM = UseISM &&
3350 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3351 if (UseISM) {
3352 // ISM disables MPSS to be compatible with old JDK behavior
3353 UseMPSS = false;
3354 _page_sizes[0] = _large_page_size;
3355 _page_sizes[1] = vm_page_size();
3356 }
3358 UseMPSS = UseMPSS &&
3359 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3361 UseLargePages = UseISM || UseMPSS;
3362 return UseLargePages;
3363 }
3365 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3366 // Signal to OS that we want large pages for addresses
3367 // from addr, addr + bytes
3368 struct memcntl_mha mpss_struct;
3369 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3370 mpss_struct.mha_pagesize = align;
3371 mpss_struct.mha_flags = 0;
3372 if (memcntl(start, bytes, MC_HAT_ADVISE,
3373 (caddr_t) &mpss_struct, 0, 0) < 0) {
3374 debug_only(warning("Attempt to use MPSS failed."));
3375 return false;
3376 }
3377 return true;
3378 }
3380 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3381 // "exec" is passed in but not used. Creating the shared image for
3382 // the code cache doesn't have an SHM_X executable permission to check.
3383 assert(UseLargePages && UseISM, "only for ISM large pages");
3385 size_t size = bytes;
3386 char* retAddr = NULL;
3387 int shmid;
3388 key_t ismKey;
3390 bool warn_on_failure = UseISM &&
3391 (!FLAG_IS_DEFAULT(UseLargePages) ||
3392 !FLAG_IS_DEFAULT(UseISM) ||
3393 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3394 );
3395 char msg[128];
3397 ismKey = IPC_PRIVATE;
3399 // Create a large shared memory region to attach to based on size.
3400 // Currently, size is the total size of the heap
3401 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3402 if (shmid == -1){
3403 if (warn_on_failure) {
3404 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3405 warning(msg);
3406 }
3407 return NULL;
3408 }
3410 // Attach to the region
3411 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3412 int err = errno;
3414 // Remove shmid. If shmat() is successful, the actual shared memory segment
3415 // will be deleted when it's detached by shmdt() or when the process
3416 // terminates. If shmat() is not successful this will remove the shared
3417 // segment immediately.
3418 shmctl(shmid, IPC_RMID, NULL);
3420 if (retAddr == (char *) -1) {
3421 if (warn_on_failure) {
3422 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3423 warning(msg);
3424 }
3425 return NULL;
3426 }
3428 return retAddr;
3429 }
3431 bool os::release_memory_special(char* base, size_t bytes) {
3432 // detaching the SHM segment will also delete it, see reserve_memory_special()
3433 int rslt = shmdt(base);
3434 return rslt == 0;
3435 }
3437 size_t os::large_page_size() {
3438 return _large_page_size;
3439 }
3441 // MPSS allows application to commit large page memory on demand; with ISM
3442 // the entire memory region must be allocated as shared memory.
3443 bool os::can_commit_large_page_memory() {
3444 return UseISM ? false : true;
3445 }
3447 bool os::can_execute_large_page_memory() {
3448 return UseISM ? false : true;
3449 }
3451 static int os_sleep(jlong millis, bool interruptible) {
3452 const jlong limit = INT_MAX;
3453 jlong prevtime;
3454 int res;
3456 while (millis > limit) {
3457 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3458 return res;
3459 millis -= limit;
3460 }
3462 // Restart interrupted polls with new parameters until the proper delay
3463 // has been completed.
3465 prevtime = getTimeMillis();
3467 while (millis > 0) {
3468 jlong newtime;
3470 if (!interruptible) {
3471 // Following assert fails for os::yield_all:
3472 // assert(!thread->is_Java_thread(), "must not be java thread");
3473 res = poll(NULL, 0, millis);
3474 } else {
3475 JavaThread *jt = JavaThread::current();
3477 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3478 os::Solaris::clear_interrupted);
3479 }
3481 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3482 // thread.Interrupt.
3484 // See c/r 6751923. Poll can return 0 before time
3485 // has elapsed if time is set via clock_settime (as NTP does).
3486 // res == 0 if poll timed out (see man poll RETURN VALUES)
3487 // using the logic below checks that we really did
3488 // sleep at least "millis" if not we'll sleep again.
3489 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3490 newtime = getTimeMillis();
3491 assert(newtime >= prevtime, "time moving backwards");
3492 /* Doing prevtime and newtime in microseconds doesn't help precision,
3493 and trying to round up to avoid lost milliseconds can result in a
3494 too-short delay. */
3495 millis -= newtime - prevtime;
3496 if(millis <= 0)
3497 return OS_OK;
3498 prevtime = newtime;
3499 } else
3500 return res;
3501 }
3503 return OS_OK;
3504 }
3506 // Read calls from inside the vm need to perform state transitions
3507 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3508 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3509 }
3511 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3512 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3513 }
3515 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3516 assert(thread == Thread::current(), "thread consistency check");
3518 // TODO-FIXME: this should be removed.
3519 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3520 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3521 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3522 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3523 // is fooled into believing that the system is making progress. In the code below we block the
3524 // the watcher thread while safepoint is in progress so that it would not appear as though the
3525 // system is making progress.
3526 if (!Solaris::T2_libthread() &&
3527 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3528 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3529 // the entire safepoint, the watcher thread will line up here during the safepoint.
3530 Threads_lock->lock_without_safepoint_check();
3531 Threads_lock->unlock();
3532 }
3534 if (thread->is_Java_thread()) {
3535 // This is a JavaThread so we honor the _thread_blocked protocol
3536 // even for sleeps of 0 milliseconds. This was originally done
3537 // as a workaround for bug 4338139. However, now we also do it
3538 // to honor the suspend-equivalent protocol.
3540 JavaThread *jt = (JavaThread *) thread;
3541 ThreadBlockInVM tbivm(jt);
3543 jt->set_suspend_equivalent();
3544 // cleared by handle_special_suspend_equivalent_condition() or
3545 // java_suspend_self() via check_and_wait_while_suspended()
3547 int ret_code;
3548 if (millis <= 0) {
3549 thr_yield();
3550 ret_code = 0;
3551 } else {
3552 // The original sleep() implementation did not create an
3553 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3554 // I'm preserving that decision for now.
3555 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3557 ret_code = os_sleep(millis, interruptible);
3558 }
3560 // were we externally suspended while we were waiting?
3561 jt->check_and_wait_while_suspended();
3563 return ret_code;
3564 }
3566 // non-JavaThread from this point on:
3568 if (millis <= 0) {
3569 thr_yield();
3570 return 0;
3571 }
3573 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3575 return os_sleep(millis, interruptible);
3576 }
3578 int os::naked_sleep() {
3579 // %% make the sleep time an integer flag. for now use 1 millisec.
3580 return os_sleep(1, false);
3581 }
3583 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3584 void os::infinite_sleep() {
3585 while (true) { // sleep forever ...
3586 ::sleep(100); // ... 100 seconds at a time
3587 }
3588 }
3590 // Used to convert frequent JVM_Yield() to nops
3591 bool os::dont_yield() {
3592 if (DontYieldALot) {
3593 static hrtime_t last_time = 0;
3594 hrtime_t diff = getTimeNanos() - last_time;
3596 if (diff < DontYieldALotInterval * 1000000)
3597 return true;
3599 last_time += diff;
3601 return false;
3602 }
3603 else {
3604 return false;
3605 }
3606 }
3608 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3609 // the linux and win32 implementations do not. This should be checked.
3611 void os::yield() {
3612 // Yields to all threads with same or greater priority
3613 os::sleep(Thread::current(), 0, false);
3614 }
3616 // Note that yield semantics are defined by the scheduling class to which
3617 // the thread currently belongs. Typically, yield will _not yield to
3618 // other equal or higher priority threads that reside on the dispatch queues
3619 // of other CPUs.
3621 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3624 // On Solaris we found that yield_all doesn't always yield to all other threads.
3625 // There have been cases where there is a thread ready to execute but it doesn't
3626 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3627 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3628 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3629 // number of times yield_all is called in the one loop and increase the sleep
3630 // time after 8 attempts. If this fails too we increase the concurrency level
3631 // so that the starving thread would get an lwp
3633 void os::yield_all(int attempts) {
3634 // Yields to all threads, including threads with lower priorities
3635 if (attempts == 0) {
3636 os::sleep(Thread::current(), 1, false);
3637 } else {
3638 int iterations = attempts % 30;
3639 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3640 // thr_setconcurrency and _getconcurrency make sense only under T1.
3641 int noofLWPS = thr_getconcurrency();
3642 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3643 thr_setconcurrency(thr_getconcurrency() + 1);
3644 }
3645 } else if (iterations < 25) {
3646 os::sleep(Thread::current(), 1, false);
3647 } else {
3648 os::sleep(Thread::current(), 10, false);
3649 }
3650 }
3651 }
3653 // Called from the tight loops to possibly influence time-sharing heuristics
3654 void os::loop_breaker(int attempts) {
3655 os::yield_all(attempts);
3656 }
3659 // Interface for setting lwp priorities. If we are using T2 libthread,
3660 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3661 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3662 // function is meaningless in this mode so we must adjust the real lwp's priority
3663 // The routines below implement the getting and setting of lwp priorities.
3664 //
3665 // Note: There are three priority scales used on Solaris. Java priotities
3666 // which range from 1 to 10, libthread "thr_setprio" scale which range
3667 // from 0 to 127, and the current scheduling class of the process we
3668 // are running in. This is typically from -60 to +60.
3669 // The setting of the lwp priorities in done after a call to thr_setprio
3670 // so Java priorities are mapped to libthread priorities and we map from
3671 // the latter to lwp priorities. We don't keep priorities stored in
3672 // Java priorities since some of our worker threads want to set priorities
3673 // higher than all Java threads.
3674 //
3675 // For related information:
3676 // (1) man -s 2 priocntl
3677 // (2) man -s 4 priocntl
3678 // (3) man dispadmin
3679 // = librt.so
3680 // = libthread/common/rtsched.c - thrp_setlwpprio().
3681 // = ps -cL <pid> ... to validate priority.
3682 // = sched_get_priority_min and _max
3683 // pthread_create
3684 // sched_setparam
3685 // pthread_setschedparam
3686 //
3687 // Assumptions:
3688 // + We assume that all threads in the process belong to the same
3689 // scheduling class. IE. an homogenous process.
3690 // + Must be root or in IA group to change change "interactive" attribute.
3691 // Priocntl() will fail silently. The only indication of failure is when
3692 // we read-back the value and notice that it hasn't changed.
3693 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3694 // + For RT, change timeslice as well. Invariant:
3695 // constant "priority integral"
3696 // Konst == TimeSlice * (60-Priority)
3697 // Given a priority, compute appropriate timeslice.
3698 // + Higher numerical values have higher priority.
3700 // sched class attributes
3701 typedef struct {
3702 int schedPolicy; // classID
3703 int maxPrio;
3704 int minPrio;
3705 } SchedInfo;
3708 static SchedInfo tsLimits, iaLimits, rtLimits;
3710 #ifdef ASSERT
3711 static int ReadBackValidate = 1;
3712 #endif
3713 static int myClass = 0;
3714 static int myMin = 0;
3715 static int myMax = 0;
3716 static int myCur = 0;
3717 static bool priocntl_enable = false;
3720 // Call the version of priocntl suitable for all supported versions
3721 // of Solaris. We need to call through this wrapper so that we can
3722 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3723 //
3724 // This code should be removed if we ever stop supporting Solaris 8
3725 // and earlier releases.
3727 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3728 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3729 static priocntl_type priocntl_ptr = priocntl_stub;
3731 // Stub to set the value of the real pointer, and then call the real
3732 // function.
3734 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3735 // Try Solaris 8- name only.
3736 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3737 guarantee(tmp != NULL, "priocntl function not found.");
3738 priocntl_ptr = tmp;
3739 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3740 }
3743 // lwp_priocntl_init
3744 //
3745 // Try to determine the priority scale for our process.
3746 //
3747 // Return errno or 0 if OK.
3748 //
3749 static
3750 int lwp_priocntl_init ()
3751 {
3752 int rslt;
3753 pcinfo_t ClassInfo;
3754 pcparms_t ParmInfo;
3755 int i;
3757 if (!UseThreadPriorities) return 0;
3759 // We are using Bound threads, we need to determine our priority ranges
3760 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3761 // If ThreadPriorityPolicy is 1, switch tables
3762 if (ThreadPriorityPolicy == 1) {
3763 for (i = 0 ; i < MaxPriority+1; i++)
3764 os::java_to_os_priority[i] = prio_policy1[i];
3765 }
3766 }
3767 // Not using Bound Threads, set to ThreadPolicy 1
3768 else {
3769 for ( i = 0 ; i < MaxPriority+1; i++ ) {
3770 os::java_to_os_priority[i] = prio_policy1[i];
3771 }
3772 return 0;
3773 }
3776 // Get IDs for a set of well-known scheduling classes.
3777 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3778 // the system. We should have a loop that iterates over the
3779 // classID values, which are known to be "small" integers.
3781 strcpy(ClassInfo.pc_clname, "TS");
3782 ClassInfo.pc_cid = -1;
3783 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3784 if (rslt < 0) return errno;
3785 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3786 tsLimits.schedPolicy = ClassInfo.pc_cid;
3787 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3788 tsLimits.minPrio = -tsLimits.maxPrio;
3790 strcpy(ClassInfo.pc_clname, "IA");
3791 ClassInfo.pc_cid = -1;
3792 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3793 if (rslt < 0) return errno;
3794 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3795 iaLimits.schedPolicy = ClassInfo.pc_cid;
3796 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3797 iaLimits.minPrio = -iaLimits.maxPrio;
3799 strcpy(ClassInfo.pc_clname, "RT");
3800 ClassInfo.pc_cid = -1;
3801 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3802 if (rslt < 0) return errno;
3803 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3804 rtLimits.schedPolicy = ClassInfo.pc_cid;
3805 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3806 rtLimits.minPrio = 0;
3809 // Query our "current" scheduling class.
3810 // This will normally be IA,TS or, rarely, RT.
3811 memset (&ParmInfo, 0, sizeof(ParmInfo));
3812 ParmInfo.pc_cid = PC_CLNULL;
3813 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo );
3814 if ( rslt < 0 ) return errno;
3815 myClass = ParmInfo.pc_cid;
3817 // We now know our scheduling classId, get specific information
3818 // the class.
3819 ClassInfo.pc_cid = myClass;
3820 ClassInfo.pc_clname[0] = 0;
3821 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo );
3822 if ( rslt < 0 ) return errno;
3824 if (ThreadPriorityVerbose)
3825 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3827 memset(&ParmInfo, 0, sizeof(pcparms_t));
3828 ParmInfo.pc_cid = PC_CLNULL;
3829 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3830 if (rslt < 0) return errno;
3832 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3833 myMin = rtLimits.minPrio;
3834 myMax = rtLimits.maxPrio;
3835 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3836 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3837 myMin = iaLimits.minPrio;
3838 myMax = iaLimits.maxPrio;
3839 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3840 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3841 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3842 myMin = tsLimits.minPrio;
3843 myMax = tsLimits.maxPrio;
3844 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3845 } else {
3846 // No clue - punt
3847 if (ThreadPriorityVerbose)
3848 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3849 return EINVAL; // no clue, punt
3850 }
3852 if (ThreadPriorityVerbose)
3853 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3855 priocntl_enable = true; // Enable changing priorities
3856 return 0;
3857 }
3859 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3860 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3861 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3864 // scale_to_lwp_priority
3865 //
3866 // Convert from the libthread "thr_setprio" scale to our current
3867 // lwp scheduling class scale.
3868 //
3869 static
3870 int scale_to_lwp_priority (int rMin, int rMax, int x)
3871 {
3872 int v;
3874 if (x == 127) return rMax; // avoid round-down
3875 v = (((x*(rMax-rMin)))/128)+rMin;
3876 return v;
3877 }
3880 // set_lwp_priority
3881 //
3882 // Set the priority of the lwp. This call should only be made
3883 // when using bound threads (T2 threads are bound by default).
3884 //
3885 int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
3886 {
3887 int rslt;
3888 int Actual, Expected, prv;
3889 pcparms_t ParmInfo; // for GET-SET
3890 #ifdef ASSERT
3891 pcparms_t ReadBack; // for readback
3892 #endif
3894 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3895 // Query current values.
3896 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3897 // Cache "pcparms_t" in global ParmCache.
3898 // TODO: elide set-to-same-value
3900 // If something went wrong on init, don't change priorities.
3901 if ( !priocntl_enable ) {
3902 if (ThreadPriorityVerbose)
3903 tty->print_cr("Trying to set priority but init failed, ignoring");
3904 return EINVAL;
3905 }
3908 // If lwp hasn't started yet, just return
3909 // the _start routine will call us again.
3910 if ( lwpid <= 0 ) {
3911 if (ThreadPriorityVerbose) {
3912 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set",
3913 ThreadID, newPrio);
3914 }
3915 return 0;
3916 }
3918 if (ThreadPriorityVerbose) {
3919 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3920 ThreadID, lwpid, newPrio);
3921 }
3923 memset(&ParmInfo, 0, sizeof(pcparms_t));
3924 ParmInfo.pc_cid = PC_CLNULL;
3925 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3926 if (rslt < 0) return errno;
3928 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3929 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3930 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio);
3931 rtInfo->rt_tqsecs = RT_NOCHANGE;
3932 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3933 if (ThreadPriorityVerbose) {
3934 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3935 }
3936 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3937 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3938 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim);
3939 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio);
3940 iaInfo->ia_uprilim = IA_NOCHANGE;
3941 iaInfo->ia_mode = IA_NOCHANGE;
3942 if (ThreadPriorityVerbose) {
3943 tty->print_cr ("IA: [%d...%d] %d->%d\n",
3944 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3945 }
3946 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3947 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3948 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim);
3949 prv = tsInfo->ts_upri;
3950 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio);
3951 tsInfo->ts_uprilim = IA_NOCHANGE;
3952 if (ThreadPriorityVerbose) {
3953 tty->print_cr ("TS: %d [%d...%d] %d->%d\n",
3954 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3955 }
3956 if (prv == tsInfo->ts_upri) return 0;
3957 } else {
3958 if ( ThreadPriorityVerbose ) {
3959 tty->print_cr ("Unknown scheduling class\n");
3960 }
3961 return EINVAL; // no clue, punt
3962 }
3964 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3965 if (ThreadPriorityVerbose && rslt) {
3966 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3967 }
3968 if (rslt < 0) return errno;
3970 #ifdef ASSERT
3971 // Sanity check: read back what we just attempted to set.
3972 // In theory it could have changed in the interim ...
3973 //
3974 // The priocntl system call is tricky.
3975 // Sometimes it'll validate the priority value argument and
3976 // return EINVAL if unhappy. At other times it fails silently.
3977 // Readbacks are prudent.
3979 if (!ReadBackValidate) return 0;
3981 memset(&ReadBack, 0, sizeof(pcparms_t));
3982 ReadBack.pc_cid = PC_CLNULL;
3983 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3984 assert(rslt >= 0, "priocntl failed");
3985 Actual = Expected = 0xBAD;
3986 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3987 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3988 Actual = RTPRI(ReadBack)->rt_pri;
3989 Expected = RTPRI(ParmInfo)->rt_pri;
3990 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3991 Actual = IAPRI(ReadBack)->ia_upri;
3992 Expected = IAPRI(ParmInfo)->ia_upri;
3993 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3994 Actual = TSPRI(ReadBack)->ts_upri;
3995 Expected = TSPRI(ParmInfo)->ts_upri;
3996 } else {
3997 if ( ThreadPriorityVerbose ) {
3998 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid);
3999 }
4000 }
4002 if (Actual != Expected) {
4003 if ( ThreadPriorityVerbose ) {
4004 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
4005 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
4006 }
4007 }
4008 #endif
4010 return 0;
4011 }
4015 // Solaris only gives access to 128 real priorities at a time,
4016 // so we expand Java's ten to fill this range. This would be better
4017 // if we dynamically adjusted relative priorities.
4018 //
4019 // The ThreadPriorityPolicy option allows us to select 2 different
4020 // priority scales.
4021 //
4022 // ThreadPriorityPolicy=0
4023 // Since the Solaris' default priority is MaximumPriority, we do not
4024 // set a priority lower than Max unless a priority lower than
4025 // NormPriority is requested.
4026 //
4027 // ThreadPriorityPolicy=1
4028 // This mode causes the priority table to get filled with
4029 // linear values. NormPriority get's mapped to 50% of the
4030 // Maximum priority an so on. This will cause VM threads
4031 // to get unfair treatment against other Solaris processes
4032 // which do not explicitly alter their thread priorities.
4033 //
4036 int os::java_to_os_priority[MaxPriority + 1] = {
4037 -99999, // 0 Entry should never be used
4039 0, // 1 MinPriority
4040 32, // 2
4041 64, // 3
4043 96, // 4
4044 127, // 5 NormPriority
4045 127, // 6
4047 127, // 7
4048 127, // 8
4049 127, // 9 NearMaxPriority
4051 127 // 10 MaxPriority
4052 };
4055 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4056 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4057 if ( !UseThreadPriorities ) return OS_OK;
4058 int status = thr_setprio(thread->osthread()->thread_id(), newpri);
4059 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) )
4060 status |= (set_lwp_priority (thread->osthread()->thread_id(),
4061 thread->osthread()->lwp_id(), newpri ));
4062 return (status == 0) ? OS_OK : OS_ERR;
4063 }
4066 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4067 int p;
4068 if ( !UseThreadPriorities ) {
4069 *priority_ptr = NormalPriority;
4070 return OS_OK;
4071 }
4072 int status = thr_getprio(thread->osthread()->thread_id(), &p);
4073 if (status != 0) {
4074 return OS_ERR;
4075 }
4076 *priority_ptr = p;
4077 return OS_OK;
4078 }
4081 // Hint to the underlying OS that a task switch would not be good.
4082 // Void return because it's a hint and can fail.
4083 void os::hint_no_preempt() {
4084 schedctl_start(schedctl_init());
4085 }
4087 void os::interrupt(Thread* thread) {
4088 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4090 OSThread* osthread = thread->osthread();
4092 int isInterrupted = osthread->interrupted();
4093 if (!isInterrupted) {
4094 osthread->set_interrupted(true);
4095 OrderAccess::fence();
4096 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4097 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4098 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4099 ParkEvent * const slp = thread->_SleepEvent ;
4100 if (slp != NULL) slp->unpark() ;
4101 }
4103 // For JSR166: unpark after setting status but before thr_kill -dl
4104 if (thread->is_Java_thread()) {
4105 ((JavaThread*)thread)->parker()->unpark();
4106 }
4108 // Handle interruptible wait() ...
4109 ParkEvent * const ev = thread->_ParkEvent ;
4110 if (ev != NULL) ev->unpark() ;
4112 // When events are used everywhere for os::sleep, then this thr_kill
4113 // will only be needed if UseVMInterruptibleIO is true.
4115 if (!isInterrupted) {
4116 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4117 assert_status(status == 0, status, "thr_kill");
4119 // Bump thread interruption counter
4120 RuntimeService::record_thread_interrupt_signaled_count();
4121 }
4122 }
4125 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4126 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4128 OSThread* osthread = thread->osthread();
4130 bool res = osthread->interrupted();
4132 // NOTE that since there is no "lock" around these two operations,
4133 // there is the possibility that the interrupted flag will be
4134 // "false" but that the interrupt event will be set. This is
4135 // intentional. The effect of this is that Object.wait() will appear
4136 // to have a spurious wakeup, which is not harmful, and the
4137 // possibility is so rare that it is not worth the added complexity
4138 // to add yet another lock. It has also been recommended not to put
4139 // the interrupted flag into the os::Solaris::Event structure,
4140 // because it hides the issue.
4141 if (res && clear_interrupted) {
4142 osthread->set_interrupted(false);
4143 }
4144 return res;
4145 }
4148 void os::print_statistics() {
4149 }
4151 int os::message_box(const char* title, const char* message) {
4152 int i;
4153 fdStream err(defaultStream::error_fd());
4154 for (i = 0; i < 78; i++) err.print_raw("=");
4155 err.cr();
4156 err.print_raw_cr(title);
4157 for (i = 0; i < 78; i++) err.print_raw("-");
4158 err.cr();
4159 err.print_raw_cr(message);
4160 for (i = 0; i < 78; i++) err.print_raw("=");
4161 err.cr();
4163 char buf[16];
4164 // Prevent process from exiting upon "read error" without consuming all CPU
4165 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4167 return buf[0] == 'y' || buf[0] == 'Y';
4168 }
4170 // A lightweight implementation that does not suspend the target thread and
4171 // thus returns only a hint. Used for profiling only!
4172 ExtendedPC os::get_thread_pc(Thread* thread) {
4173 // Make sure that it is called by the watcher and the Threads lock is owned.
4174 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4175 // For now, is only used to profile the VM Thread
4176 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4177 ExtendedPC epc;
4179 GetThreadPC_Callback cb(ProfileVM_lock);
4180 OSThread *osthread = thread->osthread();
4181 const int time_to_wait = 400; // 400ms wait for initial response
4182 int status = cb.interrupt(thread, time_to_wait);
4184 if (cb.is_done() ) {
4185 epc = cb.addr();
4186 } else {
4187 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4188 osthread->thread_id(), status););
4189 // epc is already NULL
4190 }
4191 return epc;
4192 }
4195 // This does not do anything on Solaris. This is basically a hook for being
4196 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4197 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4198 f(value, method, args, thread);
4199 }
4201 // This routine may be used by user applications as a "hook" to catch signals.
4202 // The user-defined signal handler must pass unrecognized signals to this
4203 // routine, and if it returns true (non-zero), then the signal handler must
4204 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4205 // routine will never retun false (zero), but instead will execute a VM panic
4206 // routine kill the process.
4207 //
4208 // If this routine returns false, it is OK to call it again. This allows
4209 // the user-defined signal handler to perform checks either before or after
4210 // the VM performs its own checks. Naturally, the user code would be making
4211 // a serious error if it tried to handle an exception (such as a null check
4212 // or breakpoint) that the VM was generating for its own correct operation.
4213 //
4214 // This routine may recognize any of the following kinds of signals:
4215 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4216 // os::Solaris::SIGasync
4217 // It should be consulted by handlers for any of those signals.
4218 // It explicitly does not recognize os::Solaris::SIGinterrupt
4219 //
4220 // The caller of this routine must pass in the three arguments supplied
4221 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4222 // field of the structure passed to sigaction(). This routine assumes that
4223 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4224 //
4225 // Note that the VM will print warnings if it detects conflicting signal
4226 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4227 //
4228 extern "C" JNIEXPORT int
4229 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4230 int abort_if_unrecognized);
4233 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4234 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4235 }
4237 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4238 is needed to provoke threads blocked on IO to return an EINTR
4239 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4240 does NOT participate in signal chaining due to requirement for
4241 NOT setting SA_RESTART to make EINTR work. */
4242 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4243 if (UseSignalChaining) {
4244 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4245 if (actp && actp->sa_handler) {
4246 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4247 }
4248 }
4249 }
4251 // This boolean allows users to forward their own non-matching signals
4252 // to JVM_handle_solaris_signal, harmlessly.
4253 bool os::Solaris::signal_handlers_are_installed = false;
4255 // For signal-chaining
4256 bool os::Solaris::libjsig_is_loaded = false;
4257 typedef struct sigaction *(*get_signal_t)(int);
4258 get_signal_t os::Solaris::get_signal_action = NULL;
4260 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4261 struct sigaction *actp = NULL;
4263 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4264 // Retrieve the old signal handler from libjsig
4265 actp = (*get_signal_action)(sig);
4266 }
4267 if (actp == NULL) {
4268 // Retrieve the preinstalled signal handler from jvm
4269 actp = get_preinstalled_handler(sig);
4270 }
4272 return actp;
4273 }
4275 static bool call_chained_handler(struct sigaction *actp, int sig,
4276 siginfo_t *siginfo, void *context) {
4277 // Call the old signal handler
4278 if (actp->sa_handler == SIG_DFL) {
4279 // It's more reasonable to let jvm treat it as an unexpected exception
4280 // instead of taking the default action.
4281 return false;
4282 } else if (actp->sa_handler != SIG_IGN) {
4283 if ((actp->sa_flags & SA_NODEFER) == 0) {
4284 // automaticlly block the signal
4285 sigaddset(&(actp->sa_mask), sig);
4286 }
4288 sa_handler_t hand;
4289 sa_sigaction_t sa;
4290 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4291 // retrieve the chained handler
4292 if (siginfo_flag_set) {
4293 sa = actp->sa_sigaction;
4294 } else {
4295 hand = actp->sa_handler;
4296 }
4298 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4299 actp->sa_handler = SIG_DFL;
4300 }
4302 // try to honor the signal mask
4303 sigset_t oset;
4304 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4306 // call into the chained handler
4307 if (siginfo_flag_set) {
4308 (*sa)(sig, siginfo, context);
4309 } else {
4310 (*hand)(sig);
4311 }
4313 // restore the signal mask
4314 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4315 }
4316 // Tell jvm's signal handler the signal is taken care of.
4317 return true;
4318 }
4320 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4321 bool chained = false;
4322 // signal-chaining
4323 if (UseSignalChaining) {
4324 struct sigaction *actp = get_chained_signal_action(sig);
4325 if (actp != NULL) {
4326 chained = call_chained_handler(actp, sig, siginfo, context);
4327 }
4328 }
4329 return chained;
4330 }
4332 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4333 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4334 if (preinstalled_sigs[sig] != 0) {
4335 return &chainedsigactions[sig];
4336 }
4337 return NULL;
4338 }
4340 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4342 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4343 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4344 chainedsigactions[sig] = oldAct;
4345 preinstalled_sigs[sig] = 1;
4346 }
4348 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4349 // Check for overwrite.
4350 struct sigaction oldAct;
4351 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4352 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4353 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4354 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4355 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4356 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4357 if (AllowUserSignalHandlers || !set_installed) {
4358 // Do not overwrite; user takes responsibility to forward to us.
4359 return;
4360 } else if (UseSignalChaining) {
4361 if (oktochain) {
4362 // save the old handler in jvm
4363 save_preinstalled_handler(sig, oldAct);
4364 } else {
4365 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4366 }
4367 // libjsig also interposes the sigaction() call below and saves the
4368 // old sigaction on it own.
4369 } else {
4370 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4371 "%#lx for signal %d.", (long)oldhand, sig));
4372 }
4373 }
4375 struct sigaction sigAct;
4376 sigfillset(&(sigAct.sa_mask));
4377 sigAct.sa_handler = SIG_DFL;
4379 sigAct.sa_sigaction = signalHandler;
4380 // Handle SIGSEGV on alternate signal stack if
4381 // not using stack banging
4382 if (!UseStackBanging && sig == SIGSEGV) {
4383 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4384 // Interruptible i/o requires SA_RESTART cleared so EINTR
4385 // is returned instead of restarting system calls
4386 } else if (sig == os::Solaris::SIGinterrupt()) {
4387 sigemptyset(&sigAct.sa_mask);
4388 sigAct.sa_handler = NULL;
4389 sigAct.sa_flags = SA_SIGINFO;
4390 sigAct.sa_sigaction = sigINTRHandler;
4391 } else {
4392 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4393 }
4394 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4396 sigaction(sig, &sigAct, &oldAct);
4398 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4399 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4400 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4401 }
4404 #define DO_SIGNAL_CHECK(sig) \
4405 if (!sigismember(&check_signal_done, sig)) \
4406 os::Solaris::check_signal_handler(sig)
4408 // This method is a periodic task to check for misbehaving JNI applications
4409 // under CheckJNI, we can add any periodic checks here
4411 void os::run_periodic_checks() {
4412 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4413 // thereby preventing a NULL checks.
4414 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4416 if (check_signals == false) return;
4418 // SEGV and BUS if overridden could potentially prevent
4419 // generation of hs*.log in the event of a crash, debugging
4420 // such a case can be very challenging, so we absolutely
4421 // check for the following for a good measure:
4422 DO_SIGNAL_CHECK(SIGSEGV);
4423 DO_SIGNAL_CHECK(SIGILL);
4424 DO_SIGNAL_CHECK(SIGFPE);
4425 DO_SIGNAL_CHECK(SIGBUS);
4426 DO_SIGNAL_CHECK(SIGPIPE);
4427 DO_SIGNAL_CHECK(SIGXFSZ);
4429 // ReduceSignalUsage allows the user to override these handlers
4430 // see comments at the very top and jvm_solaris.h
4431 if (!ReduceSignalUsage) {
4432 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4433 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4434 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4435 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4436 }
4438 // See comments above for using JVM1/JVM2 and UseAltSigs
4439 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4440 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4442 }
4444 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4446 static os_sigaction_t os_sigaction = NULL;
4448 void os::Solaris::check_signal_handler(int sig) {
4449 char buf[O_BUFLEN];
4450 address jvmHandler = NULL;
4452 struct sigaction act;
4453 if (os_sigaction == NULL) {
4454 // only trust the default sigaction, in case it has been interposed
4455 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4456 if (os_sigaction == NULL) return;
4457 }
4459 os_sigaction(sig, (struct sigaction*)NULL, &act);
4461 address thisHandler = (act.sa_flags & SA_SIGINFO)
4462 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4463 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4466 switch(sig) {
4467 case SIGSEGV:
4468 case SIGBUS:
4469 case SIGFPE:
4470 case SIGPIPE:
4471 case SIGXFSZ:
4472 case SIGILL:
4473 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4474 break;
4476 case SHUTDOWN1_SIGNAL:
4477 case SHUTDOWN2_SIGNAL:
4478 case SHUTDOWN3_SIGNAL:
4479 case BREAK_SIGNAL:
4480 jvmHandler = (address)user_handler();
4481 break;
4483 default:
4484 int intrsig = os::Solaris::SIGinterrupt();
4485 int asynsig = os::Solaris::SIGasync();
4487 if (sig == intrsig) {
4488 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4489 } else if (sig == asynsig) {
4490 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4491 } else {
4492 return;
4493 }
4494 break;
4495 }
4498 if (thisHandler != jvmHandler) {
4499 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4500 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4501 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4502 // No need to check this sig any longer
4503 sigaddset(&check_signal_done, sig);
4504 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4505 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4506 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4507 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4508 // No need to check this sig any longer
4509 sigaddset(&check_signal_done, sig);
4510 }
4512 // Print all the signal handler state
4513 if (sigismember(&check_signal_done, sig)) {
4514 print_signal_handlers(tty, buf, O_BUFLEN);
4515 }
4517 }
4519 void os::Solaris::install_signal_handlers() {
4520 bool libjsigdone = false;
4521 signal_handlers_are_installed = true;
4523 // signal-chaining
4524 typedef void (*signal_setting_t)();
4525 signal_setting_t begin_signal_setting = NULL;
4526 signal_setting_t end_signal_setting = NULL;
4527 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4528 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4529 if (begin_signal_setting != NULL) {
4530 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4531 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4532 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4533 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4534 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4535 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4536 libjsig_is_loaded = true;
4537 if (os::Solaris::get_libjsig_version != NULL) {
4538 libjsigversion = (*os::Solaris::get_libjsig_version)();
4539 }
4540 assert(UseSignalChaining, "should enable signal-chaining");
4541 }
4542 if (libjsig_is_loaded) {
4543 // Tell libjsig jvm is setting signal handlers
4544 (*begin_signal_setting)();
4545 }
4547 set_signal_handler(SIGSEGV, true, true);
4548 set_signal_handler(SIGPIPE, true, true);
4549 set_signal_handler(SIGXFSZ, true, true);
4550 set_signal_handler(SIGBUS, true, true);
4551 set_signal_handler(SIGILL, true, true);
4552 set_signal_handler(SIGFPE, true, true);
4555 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4557 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4558 // can not register overridable signals which might be > 32
4559 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4560 // Tell libjsig jvm has finished setting signal handlers
4561 (*end_signal_setting)();
4562 libjsigdone = true;
4563 }
4564 }
4566 // Never ok to chain our SIGinterrupt
4567 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4568 set_signal_handler(os::Solaris::SIGasync(), true, true);
4570 if (libjsig_is_loaded && !libjsigdone) {
4571 // Tell libjsig jvm finishes setting signal handlers
4572 (*end_signal_setting)();
4573 }
4575 // We don't activate signal checker if libjsig is in place, we trust ourselves
4576 // and if UserSignalHandler is installed all bets are off
4577 if (CheckJNICalls) {
4578 if (libjsig_is_loaded) {
4579 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4580 check_signals = false;
4581 }
4582 if (AllowUserSignalHandlers) {
4583 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4584 check_signals = false;
4585 }
4586 }
4587 }
4590 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4592 const char * signames[] = {
4593 "SIG0",
4594 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4595 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4596 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4597 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4598 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4599 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4600 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4601 "SIGCANCEL", "SIGLOST"
4602 };
4604 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4605 if (0 < exception_code && exception_code <= SIGRTMAX) {
4606 // signal
4607 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4608 jio_snprintf(buf, size, "%s", signames[exception_code]);
4609 } else {
4610 jio_snprintf(buf, size, "SIG%d", exception_code);
4611 }
4612 return buf;
4613 } else {
4614 return NULL;
4615 }
4616 }
4618 // (Static) wrappers for the new libthread API
4619 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4620 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4621 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4622 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4623 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4625 // (Static) wrapper for getisax(2) call.
4626 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4628 // (Static) wrappers for the liblgrp API
4629 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4630 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4631 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4632 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4633 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4634 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4635 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4636 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4637 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4639 // (Static) wrapper for meminfo() call.
4640 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4642 static address resolve_symbol_lazy(const char* name) {
4643 address addr = (address) dlsym(RTLD_DEFAULT, name);
4644 if(addr == NULL) {
4645 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4646 addr = (address) dlsym(RTLD_NEXT, name);
4647 }
4648 return addr;
4649 }
4651 static address resolve_symbol(const char* name) {
4652 address addr = resolve_symbol_lazy(name);
4653 if(addr == NULL) {
4654 fatal(dlerror());
4655 }
4656 return addr;
4657 }
4661 // isT2_libthread()
4662 //
4663 // Routine to determine if we are currently using the new T2 libthread.
4664 //
4665 // We determine if we are using T2 by reading /proc/self/lstatus and
4666 // looking for a thread with the ASLWP bit set. If we find this status
4667 // bit set, we must assume that we are NOT using T2. The T2 team
4668 // has approved this algorithm.
4669 //
4670 // We need to determine if we are running with the new T2 libthread
4671 // since setting native thread priorities is handled differently
4672 // when using this library. All threads created using T2 are bound
4673 // threads. Calling thr_setprio is meaningless in this case.
4674 //
4675 bool isT2_libthread() {
4676 static prheader_t * lwpArray = NULL;
4677 static int lwpSize = 0;
4678 static int lwpFile = -1;
4679 lwpstatus_t * that;
4680 char lwpName [128];
4681 bool isT2 = false;
4683 #define ADR(x) ((uintptr_t)(x))
4684 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4686 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4687 if (lwpFile < 0) {
4688 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4689 return false;
4690 }
4691 lwpSize = 16*1024;
4692 for (;;) {
4693 ::lseek64 (lwpFile, 0, SEEK_SET);
4694 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize);
4695 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4696 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4697 break;
4698 }
4699 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4700 // We got a good snapshot - now iterate over the list.
4701 int aslwpcount = 0;
4702 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4703 that = LWPINDEX(lwpArray,i);
4704 if (that->pr_flags & PR_ASLWP) {
4705 aslwpcount++;
4706 }
4707 }
4708 if (aslwpcount == 0) isT2 = true;
4709 break;
4710 }
4711 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4712 FREE_C_HEAP_ARRAY(char, lwpArray); // retry.
4713 }
4715 FREE_C_HEAP_ARRAY(char, lwpArray);
4716 ::close (lwpFile);
4717 if (ThreadPriorityVerbose) {
4718 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4719 else tty->print_cr("We are not running with a T2 libthread\n");
4720 }
4721 return isT2;
4722 }
4725 void os::Solaris::libthread_init() {
4726 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4728 // Determine if we are running with the new T2 libthread
4729 os::Solaris::set_T2_libthread(isT2_libthread());
4731 lwp_priocntl_init();
4733 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4734 if(func == NULL) {
4735 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4736 // Guarantee that this VM is running on an new enough OS (5.6 or
4737 // later) that it will have a new enough libthread.so.
4738 guarantee(func != NULL, "libthread.so is too old.");
4739 }
4741 // Initialize the new libthread getstate API wrappers
4742 func = resolve_symbol("thr_getstate");
4743 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4745 func = resolve_symbol("thr_setstate");
4746 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4748 func = resolve_symbol("thr_setmutator");
4749 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4751 func = resolve_symbol("thr_suspend_mutator");
4752 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4754 func = resolve_symbol("thr_continue_mutator");
4755 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4757 int size;
4758 void (*handler_info_func)(address *, int *);
4759 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4760 handler_info_func(&handler_start, &size);
4761 handler_end = handler_start + size;
4762 }
4765 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4766 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4767 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4768 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4769 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4770 int os::Solaris::_mutex_scope = USYNC_THREAD;
4772 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4773 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4774 int_fnP_cond_tP os::Solaris::_cond_signal;
4775 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4776 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4777 int_fnP_cond_tP os::Solaris::_cond_destroy;
4778 int os::Solaris::_cond_scope = USYNC_THREAD;
4780 void os::Solaris::synchronization_init() {
4781 if(UseLWPSynchronization) {
4782 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4783 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4784 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4785 os::Solaris::set_mutex_init(lwp_mutex_init);
4786 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4787 os::Solaris::set_mutex_scope(USYNC_THREAD);
4789 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4790 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4791 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4792 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4793 os::Solaris::set_cond_init(lwp_cond_init);
4794 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4795 os::Solaris::set_cond_scope(USYNC_THREAD);
4796 }
4797 else {
4798 os::Solaris::set_mutex_scope(USYNC_THREAD);
4799 os::Solaris::set_cond_scope(USYNC_THREAD);
4801 if(UsePthreads) {
4802 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4803 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4804 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4805 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4806 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4808 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4809 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4810 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4811 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4812 os::Solaris::set_cond_init(pthread_cond_default_init);
4813 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4814 }
4815 else {
4816 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4817 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4818 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4819 os::Solaris::set_mutex_init(::mutex_init);
4820 os::Solaris::set_mutex_destroy(::mutex_destroy);
4822 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4823 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4824 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4825 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4826 os::Solaris::set_cond_init(::cond_init);
4827 os::Solaris::set_cond_destroy(::cond_destroy);
4828 }
4829 }
4830 }
4832 bool os::Solaris::liblgrp_init() {
4833 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4834 if (handle != NULL) {
4835 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4836 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4837 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4838 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4839 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4840 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4841 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4842 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4843 dlsym(handle, "lgrp_cookie_stale")));
4845 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4846 set_lgrp_cookie(c);
4847 return true;
4848 }
4849 return false;
4850 }
4852 void os::Solaris::misc_sym_init() {
4853 address func;
4855 // getisax
4856 func = resolve_symbol_lazy("getisax");
4857 if (func != NULL) {
4858 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4859 }
4861 // meminfo
4862 func = resolve_symbol_lazy("meminfo");
4863 if (func != NULL) {
4864 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4865 }
4866 }
4868 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4869 assert(_getisax != NULL, "_getisax not set");
4870 return _getisax(array, n);
4871 }
4873 // Symbol doesn't exist in Solaris 8 pset.h
4874 #ifndef PS_MYID
4875 #define PS_MYID -3
4876 #endif
4878 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4879 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4880 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4882 void init_pset_getloadavg_ptr(void) {
4883 pset_getloadavg_ptr =
4884 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4885 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4886 warning("pset_getloadavg function not found");
4887 }
4888 }
4890 int os::Solaris::_dev_zero_fd = -1;
4892 // this is called _before_ the global arguments have been parsed
4893 void os::init(void) {
4894 _initial_pid = getpid();
4896 max_hrtime = first_hrtime = gethrtime();
4898 init_random(1234567);
4900 page_size = sysconf(_SC_PAGESIZE);
4901 if (page_size == -1)
4902 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4903 strerror(errno)));
4904 init_page_sizes((size_t) page_size);
4906 Solaris::initialize_system_info();
4908 // Initialize misc. symbols as soon as possible, so we can use them
4909 // if we need them.
4910 Solaris::misc_sym_init();
4912 int fd = ::open("/dev/zero", O_RDWR);
4913 if (fd < 0) {
4914 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4915 } else {
4916 Solaris::set_dev_zero_fd(fd);
4918 // Close on exec, child won't inherit.
4919 fcntl(fd, F_SETFD, FD_CLOEXEC);
4920 }
4922 clock_tics_per_sec = CLK_TCK;
4924 // check if dladdr1() exists; dladdr1 can provide more information than
4925 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4926 // and is available on linker patches for 5.7 and 5.8.
4927 // libdl.so must have been loaded, this call is just an entry lookup
4928 void * hdl = dlopen("libdl.so", RTLD_NOW);
4929 if (hdl)
4930 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4932 // (Solaris only) this switches to calls that actually do locking.
4933 ThreadCritical::initialize();
4935 main_thread = thr_self();
4937 // Constant minimum stack size allowed. It must be at least
4938 // the minimum of what the OS supports (thr_min_stack()), and
4939 // enough to allow the thread to get to user bytecode execution.
4940 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4941 // If the pagesize of the VM is greater than 8K determine the appropriate
4942 // number of initial guard pages. The user can change this with the
4943 // command line arguments, if needed.
4944 if (vm_page_size() > 8*K) {
4945 StackYellowPages = 1;
4946 StackRedPages = 1;
4947 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4948 }
4949 }
4951 // To install functions for atexit system call
4952 extern "C" {
4953 static void perfMemory_exit_helper() {
4954 perfMemory_exit();
4955 }
4956 }
4958 // this is called _after_ the global arguments have been parsed
4959 jint os::init_2(void) {
4960 // try to enable extended file IO ASAP, see 6431278
4961 os::Solaris::try_enable_extended_io();
4963 // Allocate a single page and mark it as readable for safepoint polling. Also
4964 // use this first mmap call to check support for MAP_ALIGN.
4965 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4966 page_size,
4967 MAP_PRIVATE | MAP_ALIGN,
4968 PROT_READ);
4969 if (polling_page == NULL) {
4970 has_map_align = false;
4971 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4972 PROT_READ);
4973 }
4975 os::set_polling_page(polling_page);
4977 #ifndef PRODUCT
4978 if( Verbose && PrintMiscellaneous )
4979 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4980 #endif
4982 if (!UseMembar) {
4983 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4984 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4985 os::set_memory_serialize_page( mem_serialize_page );
4987 #ifndef PRODUCT
4988 if(Verbose && PrintMiscellaneous)
4989 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4990 #endif
4991 }
4993 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
4995 // Check minimum allowable stack size for thread creation and to initialize
4996 // the java system classes, including StackOverflowError - depends on page
4997 // size. Add a page for compiler2 recursion in main thread.
4998 // Add in 2*BytesPerWord times page size to account for VM stack during
4999 // class initialization depending on 32 or 64 bit VM.
5000 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
5001 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
5002 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5004 size_t threadStackSizeInBytes = ThreadStackSize * K;
5005 if (threadStackSizeInBytes != 0 &&
5006 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5007 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5008 os::Solaris::min_stack_allowed/K);
5009 return JNI_ERR;
5010 }
5012 // For 64kbps there will be a 64kb page size, which makes
5013 // the usable default stack size quite a bit less. Increase the
5014 // stack for 64kb (or any > than 8kb) pages, this increases
5015 // virtual memory fragmentation (since we're not creating the
5016 // stack on a power of 2 boundary. The real fix for this
5017 // should be to fix the guard page mechanism.
5019 if (vm_page_size() > 8*K) {
5020 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5021 ? threadStackSizeInBytes +
5022 ((StackYellowPages + StackRedPages) * vm_page_size())
5023 : 0;
5024 ThreadStackSize = threadStackSizeInBytes/K;
5025 }
5027 // Make the stack size a multiple of the page size so that
5028 // the yellow/red zones can be guarded.
5029 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5030 vm_page_size()));
5032 Solaris::libthread_init();
5034 if (UseNUMA) {
5035 if (!Solaris::liblgrp_init()) {
5036 UseNUMA = false;
5037 } else {
5038 size_t lgrp_limit = os::numa_get_groups_num();
5039 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit);
5040 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5041 FREE_C_HEAP_ARRAY(int, lgrp_ids);
5042 if (lgrp_num < 2) {
5043 // There's only one locality group, disable NUMA.
5044 UseNUMA = false;
5045 }
5046 }
5047 if (!UseNUMA && ForceNUMA) {
5048 UseNUMA = true;
5049 }
5050 }
5052 Solaris::signal_sets_init();
5053 Solaris::init_signal_mem();
5054 Solaris::install_signal_handlers();
5056 if (libjsigversion < JSIG_VERSION_1_4_1) {
5057 Maxlibjsigsigs = OLDMAXSIGNUM;
5058 }
5060 // initialize synchronization primitives to use either thread or
5061 // lwp synchronization (controlled by UseLWPSynchronization)
5062 Solaris::synchronization_init();
5064 if (MaxFDLimit) {
5065 // set the number of file descriptors to max. print out error
5066 // if getrlimit/setrlimit fails but continue regardless.
5067 struct rlimit nbr_files;
5068 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5069 if (status != 0) {
5070 if (PrintMiscellaneous && (Verbose || WizardMode))
5071 perror("os::init_2 getrlimit failed");
5072 } else {
5073 nbr_files.rlim_cur = nbr_files.rlim_max;
5074 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5075 if (status != 0) {
5076 if (PrintMiscellaneous && (Verbose || WizardMode))
5077 perror("os::init_2 setrlimit failed");
5078 }
5079 }
5080 }
5082 // Calculate theoretical max. size of Threads to guard gainst
5083 // artifical out-of-memory situations, where all available address-
5084 // space has been reserved by thread stacks. Default stack size is 1Mb.
5085 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5086 JavaThread::stack_size_at_create() : (1*K*K);
5087 assert(pre_thread_stack_size != 0, "Must have a stack");
5088 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5089 // we should start doing Virtual Memory banging. Currently when the threads will
5090 // have used all but 200Mb of space.
5091 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5092 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5094 // at-exit methods are called in the reverse order of their registration.
5095 // In Solaris 7 and earlier, atexit functions are called on return from
5096 // main or as a result of a call to exit(3C). There can be only 32 of
5097 // these functions registered and atexit() does not set errno. In Solaris
5098 // 8 and later, there is no limit to the number of functions registered
5099 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5100 // functions are called upon dlclose(3DL) in addition to return from main
5101 // and exit(3C).
5103 if (PerfAllowAtExitRegistration) {
5104 // only register atexit functions if PerfAllowAtExitRegistration is set.
5105 // atexit functions can be delayed until process exit time, which
5106 // can be problematic for embedded VM situations. Embedded VMs should
5107 // call DestroyJavaVM() to assure that VM resources are released.
5109 // note: perfMemory_exit_helper atexit function may be removed in
5110 // the future if the appropriate cleanup code can be added to the
5111 // VM_Exit VMOperation's doit method.
5112 if (atexit(perfMemory_exit_helper) != 0) {
5113 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5114 }
5115 }
5117 // Init pset_loadavg function pointer
5118 init_pset_getloadavg_ptr();
5120 return JNI_OK;
5121 }
5123 void os::init_3(void) {
5124 return;
5125 }
5127 // Mark the polling page as unreadable
5128 void os::make_polling_page_unreadable(void) {
5129 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5130 fatal("Could not disable polling page");
5131 };
5133 // Mark the polling page as readable
5134 void os::make_polling_page_readable(void) {
5135 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5136 fatal("Could not enable polling page");
5137 };
5139 // OS interface.
5141 bool os::check_heap(bool force) { return true; }
5143 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5144 static vsnprintf_t sol_vsnprintf = NULL;
5146 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5147 if (!sol_vsnprintf) {
5148 //search for the named symbol in the objects that were loaded after libjvm
5149 void* where = RTLD_NEXT;
5150 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5151 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5152 if (!sol_vsnprintf){
5153 //search for the named symbol in the objects that were loaded before libjvm
5154 where = RTLD_DEFAULT;
5155 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5156 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5157 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5158 }
5159 }
5160 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5161 }
5164 // Is a (classpath) directory empty?
5165 bool os::dir_is_empty(const char* path) {
5166 DIR *dir = NULL;
5167 struct dirent *ptr;
5169 dir = opendir(path);
5170 if (dir == NULL) return true;
5172 /* Scan the directory */
5173 bool result = true;
5174 char buf[sizeof(struct dirent) + MAX_PATH];
5175 struct dirent *dbuf = (struct dirent *) buf;
5176 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5177 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5178 result = false;
5179 }
5180 }
5181 closedir(dir);
5182 return result;
5183 }
5185 // This code originates from JDK's sysOpen and open64_w
5186 // from src/solaris/hpi/src/system_md.c
5188 #ifndef O_DELETE
5189 #define O_DELETE 0x10000
5190 #endif
5192 // Open a file. Unlink the file immediately after open returns
5193 // if the specified oflag has the O_DELETE flag set.
5194 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5196 int os::open(const char *path, int oflag, int mode) {
5197 if (strlen(path) > MAX_PATH - 1) {
5198 errno = ENAMETOOLONG;
5199 return -1;
5200 }
5201 int fd;
5202 int o_delete = (oflag & O_DELETE);
5203 oflag = oflag & ~O_DELETE;
5205 fd = ::open64(path, oflag, mode);
5206 if (fd == -1) return -1;
5208 //If the open succeeded, the file might still be a directory
5209 {
5210 struct stat64 buf64;
5211 int ret = ::fstat64(fd, &buf64);
5212 int st_mode = buf64.st_mode;
5214 if (ret != -1) {
5215 if ((st_mode & S_IFMT) == S_IFDIR) {
5216 errno = EISDIR;
5217 ::close(fd);
5218 return -1;
5219 }
5220 } else {
5221 ::close(fd);
5222 return -1;
5223 }
5224 }
5225 /*
5226 * 32-bit Solaris systems suffer from:
5227 *
5228 * - an historical default soft limit of 256 per-process file
5229 * descriptors that is too low for many Java programs.
5230 *
5231 * - a design flaw where file descriptors created using stdio
5232 * fopen must be less than 256, _even_ when the first limit above
5233 * has been raised. This can cause calls to fopen (but not calls to
5234 * open, for example) to fail mysteriously, perhaps in 3rd party
5235 * native code (although the JDK itself uses fopen). One can hardly
5236 * criticize them for using this most standard of all functions.
5237 *
5238 * We attempt to make everything work anyways by:
5239 *
5240 * - raising the soft limit on per-process file descriptors beyond
5241 * 256
5242 *
5243 * - As of Solaris 10u4, we can request that Solaris raise the 256
5244 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5245 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5246 *
5247 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5248 * workaround the bug by remapping non-stdio file descriptors below
5249 * 256 to ones beyond 256, which is done below.
5250 *
5251 * See:
5252 * 1085341: 32-bit stdio routines should support file descriptors >255
5253 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5254 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5255 * enable_extended_FILE_stdio() in VM initialisation
5256 * Giri Mandalika's blog
5257 * http://technopark02.blogspot.com/2005_05_01_archive.html
5258 */
5259 #ifndef _LP64
5260 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5261 int newfd = ::fcntl(fd, F_DUPFD, 256);
5262 if (newfd != -1) {
5263 ::close(fd);
5264 fd = newfd;
5265 }
5266 }
5267 #endif // 32-bit Solaris
5268 /*
5269 * All file descriptors that are opened in the JVM and not
5270 * specifically destined for a subprocess should have the
5271 * close-on-exec flag set. If we don't set it, then careless 3rd
5272 * party native code might fork and exec without closing all
5273 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5274 * UNIXProcess.c), and this in turn might:
5275 *
5276 * - cause end-of-file to fail to be detected on some file
5277 * descriptors, resulting in mysterious hangs, or
5278 *
5279 * - might cause an fopen in the subprocess to fail on a system
5280 * suffering from bug 1085341.
5281 *
5282 * (Yes, the default setting of the close-on-exec flag is a Unix
5283 * design flaw)
5284 *
5285 * See:
5286 * 1085341: 32-bit stdio routines should support file descriptors >255
5287 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5288 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5289 */
5290 #ifdef FD_CLOEXEC
5291 {
5292 int flags = ::fcntl(fd, F_GETFD);
5293 if (flags != -1)
5294 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5295 }
5296 #endif
5298 if (o_delete != 0) {
5299 ::unlink(path);
5300 }
5301 return fd;
5302 }
5304 // create binary file, rewriting existing file if required
5305 int os::create_binary_file(const char* path, bool rewrite_existing) {
5306 int oflags = O_WRONLY | O_CREAT;
5307 if (!rewrite_existing) {
5308 oflags |= O_EXCL;
5309 }
5310 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5311 }
5313 // return current position of file pointer
5314 jlong os::current_file_offset(int fd) {
5315 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5316 }
5318 // move file pointer to the specified offset
5319 jlong os::seek_to_file_offset(int fd, jlong offset) {
5320 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5321 }
5323 jlong os::lseek(int fd, jlong offset, int whence) {
5324 return (jlong) ::lseek64(fd, offset, whence);
5325 }
5327 char * os::native_path(char *path) {
5328 return path;
5329 }
5331 int os::ftruncate(int fd, jlong length) {
5332 return ::ftruncate64(fd, length);
5333 }
5335 int os::fsync(int fd) {
5336 RESTARTABLE_RETURN_INT(::fsync(fd));
5337 }
5339 int os::available(int fd, jlong *bytes) {
5340 jlong cur, end;
5341 int mode;
5342 struct stat64 buf64;
5344 if (::fstat64(fd, &buf64) >= 0) {
5345 mode = buf64.st_mode;
5346 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5347 /*
5348 * XXX: is the following call interruptible? If so, this might
5349 * need to go through the INTERRUPT_IO() wrapper as for other
5350 * blocking, interruptible calls in this file.
5351 */
5352 int n,ioctl_return;
5354 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5355 if (ioctl_return>= 0) {
5356 *bytes = n;
5357 return 1;
5358 }
5359 }
5360 }
5361 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5362 return 0;
5363 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5364 return 0;
5365 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5366 return 0;
5367 }
5368 *bytes = end - cur;
5369 return 1;
5370 }
5372 // Map a block of memory.
5373 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
5374 char *addr, size_t bytes, bool read_only,
5375 bool allow_exec) {
5376 int prot;
5377 int flags;
5379 if (read_only) {
5380 prot = PROT_READ;
5381 flags = MAP_SHARED;
5382 } else {
5383 prot = PROT_READ | PROT_WRITE;
5384 flags = MAP_PRIVATE;
5385 }
5387 if (allow_exec) {
5388 prot |= PROT_EXEC;
5389 }
5391 if (addr != NULL) {
5392 flags |= MAP_FIXED;
5393 }
5395 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5396 fd, file_offset);
5397 if (mapped_address == MAP_FAILED) {
5398 return NULL;
5399 }
5400 return mapped_address;
5401 }
5404 // Remap a block of memory.
5405 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
5406 char *addr, size_t bytes, bool read_only,
5407 bool allow_exec) {
5408 // same as map_memory() on this OS
5409 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5410 allow_exec);
5411 }
5414 // Unmap a block of memory.
5415 bool os::unmap_memory(char* addr, size_t bytes) {
5416 return munmap(addr, bytes) == 0;
5417 }
5419 void os::pause() {
5420 char filename[MAX_PATH];
5421 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5422 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5423 } else {
5424 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5425 }
5427 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5428 if (fd != -1) {
5429 struct stat buf;
5430 ::close(fd);
5431 while (::stat(filename, &buf) == 0) {
5432 (void)::poll(NULL, 0, 100);
5433 }
5434 } else {
5435 jio_fprintf(stderr,
5436 "Could not open pause file '%s', continuing immediately.\n", filename);
5437 }
5438 }
5440 #ifndef PRODUCT
5441 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5442 // Turn this on if you need to trace synch operations.
5443 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5444 // and call record_synch_enable and record_synch_disable
5445 // around the computation of interest.
5447 void record_synch(char* name, bool returning); // defined below
5449 class RecordSynch {
5450 char* _name;
5451 public:
5452 RecordSynch(char* name) :_name(name)
5453 { record_synch(_name, false); }
5454 ~RecordSynch() { record_synch(_name, true); }
5455 };
5457 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5458 extern "C" ret name params { \
5459 typedef ret name##_t params; \
5460 static name##_t* implem = NULL; \
5461 static int callcount = 0; \
5462 if (implem == NULL) { \
5463 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5464 if (implem == NULL) fatal(dlerror()); \
5465 } \
5466 ++callcount; \
5467 RecordSynch _rs(#name); \
5468 inner; \
5469 return implem args; \
5470 }
5471 // in dbx, examine callcounts this way:
5472 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5474 #define CHECK_POINTER_OK(p) \
5475 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p)))
5476 #define CHECK_MU \
5477 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5478 #define CHECK_CV \
5479 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5480 #define CHECK_P(p) \
5481 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5483 #define CHECK_MUTEX(mutex_op) \
5484 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5486 CHECK_MUTEX( mutex_lock)
5487 CHECK_MUTEX( _mutex_lock)
5488 CHECK_MUTEX( mutex_unlock)
5489 CHECK_MUTEX(_mutex_unlock)
5490 CHECK_MUTEX( mutex_trylock)
5491 CHECK_MUTEX(_mutex_trylock)
5493 #define CHECK_COND(cond_op) \
5494 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5496 CHECK_COND( cond_wait);
5497 CHECK_COND(_cond_wait);
5498 CHECK_COND(_cond_wait_cancel);
5500 #define CHECK_COND2(cond_op) \
5501 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5503 CHECK_COND2( cond_timedwait);
5504 CHECK_COND2(_cond_timedwait);
5505 CHECK_COND2(_cond_timedwait_cancel);
5507 // do the _lwp_* versions too
5508 #define mutex_t lwp_mutex_t
5509 #define cond_t lwp_cond_t
5510 CHECK_MUTEX( _lwp_mutex_lock)
5511 CHECK_MUTEX( _lwp_mutex_unlock)
5512 CHECK_MUTEX( _lwp_mutex_trylock)
5513 CHECK_MUTEX( __lwp_mutex_lock)
5514 CHECK_MUTEX( __lwp_mutex_unlock)
5515 CHECK_MUTEX( __lwp_mutex_trylock)
5516 CHECK_MUTEX(___lwp_mutex_lock)
5517 CHECK_MUTEX(___lwp_mutex_unlock)
5519 CHECK_COND( _lwp_cond_wait);
5520 CHECK_COND( __lwp_cond_wait);
5521 CHECK_COND(___lwp_cond_wait);
5523 CHECK_COND2( _lwp_cond_timedwait);
5524 CHECK_COND2( __lwp_cond_timedwait);
5525 #undef mutex_t
5526 #undef cond_t
5528 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5529 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5530 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5531 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5532 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5533 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5534 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5535 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5538 // recording machinery:
5540 enum { RECORD_SYNCH_LIMIT = 200 };
5541 char* record_synch_name[RECORD_SYNCH_LIMIT];
5542 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5543 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5544 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5545 int record_synch_count = 0;
5546 bool record_synch_enabled = false;
5548 // in dbx, examine recorded data this way:
5549 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5551 void record_synch(char* name, bool returning) {
5552 if (record_synch_enabled) {
5553 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5554 record_synch_name[record_synch_count] = name;
5555 record_synch_returning[record_synch_count] = returning;
5556 record_synch_thread[record_synch_count] = thr_self();
5557 record_synch_arg0ptr[record_synch_count] = &name;
5558 record_synch_count++;
5559 }
5560 // put more checking code here:
5561 // ...
5562 }
5563 }
5565 void record_synch_enable() {
5566 // start collecting trace data, if not already doing so
5567 if (!record_synch_enabled) record_synch_count = 0;
5568 record_synch_enabled = true;
5569 }
5571 void record_synch_disable() {
5572 // stop collecting trace data
5573 record_synch_enabled = false;
5574 }
5576 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5577 #endif // PRODUCT
5579 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5580 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5581 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5584 // JVMTI & JVM monitoring and management support
5585 // The thread_cpu_time() and current_thread_cpu_time() are only
5586 // supported if is_thread_cpu_time_supported() returns true.
5587 // They are not supported on Solaris T1.
5589 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5590 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5591 // of a thread.
5592 //
5593 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5594 // returns the fast estimate available on the platform.
5596 // hrtime_t gethrvtime() return value includes
5597 // user time but does not include system time
5598 jlong os::current_thread_cpu_time() {
5599 return (jlong) gethrvtime();
5600 }
5602 jlong os::thread_cpu_time(Thread *thread) {
5603 // return user level CPU time only to be consistent with
5604 // what current_thread_cpu_time returns.
5605 // thread_cpu_time_info() must be changed if this changes
5606 return os::thread_cpu_time(thread, false /* user time only */);
5607 }
5609 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5610 if (user_sys_cpu_time) {
5611 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5612 } else {
5613 return os::current_thread_cpu_time();
5614 }
5615 }
5617 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5618 char proc_name[64];
5619 int count;
5620 prusage_t prusage;
5621 jlong lwp_time;
5622 int fd;
5624 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5625 getpid(),
5626 thread->osthread()->lwp_id());
5627 fd = ::open(proc_name, O_RDONLY);
5628 if ( fd == -1 ) return -1;
5630 do {
5631 count = ::pread(fd,
5632 (void *)&prusage.pr_utime,
5633 thr_time_size,
5634 thr_time_off);
5635 } while (count < 0 && errno == EINTR);
5636 ::close(fd);
5637 if ( count < 0 ) return -1;
5639 if (user_sys_cpu_time) {
5640 // user + system CPU time
5641 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5642 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5643 (jlong)prusage.pr_stime.tv_nsec +
5644 (jlong)prusage.pr_utime.tv_nsec;
5645 } else {
5646 // user level CPU time only
5647 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5648 (jlong)prusage.pr_utime.tv_nsec;
5649 }
5651 return(lwp_time);
5652 }
5654 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5655 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5656 info_ptr->may_skip_backward = false; // elapsed time not wall time
5657 info_ptr->may_skip_forward = false; // elapsed time not wall time
5658 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5659 }
5661 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5662 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5663 info_ptr->may_skip_backward = false; // elapsed time not wall time
5664 info_ptr->may_skip_forward = false; // elapsed time not wall time
5665 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5666 }
5668 bool os::is_thread_cpu_time_supported() {
5669 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5670 return true;
5671 } else {
5672 return false;
5673 }
5674 }
5676 // System loadavg support. Returns -1 if load average cannot be obtained.
5677 // Return the load average for our processor set if the primitive exists
5678 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5679 int os::loadavg(double loadavg[], int nelem) {
5680 if (pset_getloadavg_ptr != NULL) {
5681 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5682 } else {
5683 return ::getloadavg(loadavg, nelem);
5684 }
5685 }
5687 //---------------------------------------------------------------------------------
5689 static address same_page(address x, address y) {
5690 intptr_t page_bits = -os::vm_page_size();
5691 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
5692 return x;
5693 else if (x > y)
5694 return (address)(intptr_t(y) | ~page_bits) + 1;
5695 else
5696 return (address)(intptr_t(y) & page_bits);
5697 }
5699 bool os::find(address addr, outputStream* st) {
5700 Dl_info dlinfo;
5701 memset(&dlinfo, 0, sizeof(dlinfo));
5702 if (dladdr(addr, &dlinfo)) {
5703 #ifdef _LP64
5704 st->print("0x%016lx: ", addr);
5705 #else
5706 st->print("0x%08x: ", addr);
5707 #endif
5708 if (dlinfo.dli_sname != NULL)
5709 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5710 else if (dlinfo.dli_fname)
5711 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5712 else
5713 st->print("<absolute address>");
5714 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname);
5715 #ifdef _LP64
5716 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase);
5717 #else
5718 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase);
5719 #endif
5720 st->cr();
5722 if (Verbose) {
5723 // decode some bytes around the PC
5724 address begin = same_page(addr-40, addr);
5725 address end = same_page(addr+40, addr);
5726 address lowest = (address) dlinfo.dli_sname;
5727 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5728 if (begin < lowest) begin = lowest;
5729 Dl_info dlinfo2;
5730 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5731 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5732 end = (address) dlinfo2.dli_saddr;
5733 Disassembler::decode(begin, end, st);
5734 }
5735 return true;
5736 }
5737 return false;
5738 }
5740 // Following function has been added to support HotSparc's libjvm.so running
5741 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5742 // src/solaris/hpi/native_threads in the EVM codebase.
5743 //
5744 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5745 // libraries and should thus be removed. We will leave it behind for a while
5746 // until we no longer want to able to run on top of 1.3.0 Solaris production
5747 // JDK. See 4341971.
5749 #define STACK_SLACK 0x800
5751 extern "C" {
5752 intptr_t sysThreadAvailableStackWithSlack() {
5753 stack_t st;
5754 intptr_t retval, stack_top;
5755 retval = thr_stksegment(&st);
5756 assert(retval == 0, "incorrect return value from thr_stksegment");
5757 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5758 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5759 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5760 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5761 }
5762 }
5764 // Just to get the Kernel build to link on solaris for testing.
5766 extern "C" {
5767 class ASGCT_CallTrace;
5768 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext)
5769 KERNEL_RETURN;
5770 }
5773 // ObjectMonitor park-unpark infrastructure ...
5774 //
5775 // We implement Solaris and Linux PlatformEvents with the
5776 // obvious condvar-mutex-flag triple.
5777 // Another alternative that works quite well is pipes:
5778 // Each PlatformEvent consists of a pipe-pair.
5779 // The thread associated with the PlatformEvent
5780 // calls park(), which reads from the input end of the pipe.
5781 // Unpark() writes into the other end of the pipe.
5782 // The write-side of the pipe must be set NDELAY.
5783 // Unfortunately pipes consume a large # of handles.
5784 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5785 // Using pipes for the 1st few threads might be workable, however.
5786 //
5787 // park() is permitted to return spuriously.
5788 // Callers of park() should wrap the call to park() in
5789 // an appropriate loop. A litmus test for the correct
5790 // usage of park is the following: if park() were modified
5791 // to immediately return 0 your code should still work,
5792 // albeit degenerating to a spin loop.
5793 //
5794 // An interesting optimization for park() is to use a trylock()
5795 // to attempt to acquire the mutex. If the trylock() fails
5796 // then we know that a concurrent unpark() operation is in-progress.
5797 // in that case the park() code could simply set _count to 0
5798 // and return immediately. The subsequent park() operation *might*
5799 // return immediately. That's harmless as the caller of park() is
5800 // expected to loop. By using trylock() we will have avoided a
5801 // avoided a context switch caused by contention on the per-thread mutex.
5802 //
5803 // TODO-FIXME:
5804 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5805 // objectmonitor implementation.
5806 // 2. Collapse the JSR166 parker event, and the
5807 // objectmonitor ParkEvent into a single "Event" construct.
5808 // 3. In park() and unpark() add:
5809 // assert (Thread::current() == AssociatedWith).
5810 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5811 // 1-out-of-N park() operations will return immediately.
5812 //
5813 // _Event transitions in park()
5814 // -1 => -1 : illegal
5815 // 1 => 0 : pass - return immediately
5816 // 0 => -1 : block
5817 //
5818 // _Event serves as a restricted-range semaphore.
5819 //
5820 // Another possible encoding of _Event would be with
5821 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5822 //
5823 // TODO-FIXME: add DTRACE probes for:
5824 // 1. Tx parks
5825 // 2. Ty unparks Tx
5826 // 3. Tx resumes from park
5829 // value determined through experimentation
5830 #define ROUNDINGFIX 11
5832 // utility to compute the abstime argument to timedwait.
5833 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5835 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5836 // millis is the relative timeout time
5837 // abstime will be the absolute timeout time
5838 if (millis < 0) millis = 0;
5839 struct timeval now;
5840 int status = gettimeofday(&now, NULL);
5841 assert(status == 0, "gettimeofday");
5842 jlong seconds = millis / 1000;
5843 jlong max_wait_period;
5845 if (UseLWPSynchronization) {
5846 // forward port of fix for 4275818 (not sleeping long enough)
5847 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5848 // _lwp_cond_timedwait() used a round_down algorithm rather
5849 // than a round_up. For millis less than our roundfactor
5850 // it rounded down to 0 which doesn't meet the spec.
5851 // For millis > roundfactor we may return a bit sooner, but
5852 // since we can not accurately identify the patch level and
5853 // this has already been fixed in Solaris 9 and 8 we will
5854 // leave it alone rather than always rounding down.
5856 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5857 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5858 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5859 max_wait_period = 21000000;
5860 } else {
5861 max_wait_period = 50000000;
5862 }
5863 millis %= 1000;
5864 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5865 seconds = max_wait_period;
5866 }
5867 abstime->tv_sec = now.tv_sec + seconds;
5868 long usec = now.tv_usec + millis * 1000;
5869 if (usec >= 1000000) {
5870 abstime->tv_sec += 1;
5871 usec -= 1000000;
5872 }
5873 abstime->tv_nsec = usec * 1000;
5874 return abstime;
5875 }
5877 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5878 // Conceptually TryPark() should be equivalent to park(0).
5880 int os::PlatformEvent::TryPark() {
5881 for (;;) {
5882 const int v = _Event ;
5883 guarantee ((v == 0) || (v == 1), "invariant") ;
5884 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5885 }
5886 }
5888 void os::PlatformEvent::park() { // AKA: down()
5889 // Invariant: Only the thread associated with the Event/PlatformEvent
5890 // may call park().
5891 int v ;
5892 for (;;) {
5893 v = _Event ;
5894 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5895 }
5896 guarantee (v >= 0, "invariant") ;
5897 if (v == 0) {
5898 // Do this the hard way by blocking ...
5899 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5900 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5901 // Only for SPARC >= V8PlusA
5902 #if defined(__sparc) && defined(COMPILER2)
5903 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5904 #endif
5905 int status = os::Solaris::mutex_lock(_mutex);
5906 assert_status(status == 0, status, "mutex_lock");
5907 guarantee (_nParked == 0, "invariant") ;
5908 ++ _nParked ;
5909 while (_Event < 0) {
5910 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5911 // Treat this the same as if the wait was interrupted
5912 // With usr/lib/lwp going to kernel, always handle ETIME
5913 status = os::Solaris::cond_wait(_cond, _mutex);
5914 if (status == ETIME) status = EINTR ;
5915 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5916 }
5917 -- _nParked ;
5918 _Event = 0 ;
5919 status = os::Solaris::mutex_unlock(_mutex);
5920 assert_status(status == 0, status, "mutex_unlock");
5921 }
5922 }
5924 int os::PlatformEvent::park(jlong millis) {
5925 guarantee (_nParked == 0, "invariant") ;
5926 int v ;
5927 for (;;) {
5928 v = _Event ;
5929 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5930 }
5931 guarantee (v >= 0, "invariant") ;
5932 if (v != 0) return OS_OK ;
5934 int ret = OS_TIMEOUT;
5935 timestruc_t abst;
5936 compute_abstime (&abst, millis);
5938 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5939 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5940 // Only for SPARC >= V8PlusA
5941 #if defined(__sparc) && defined(COMPILER2)
5942 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5943 #endif
5944 int status = os::Solaris::mutex_lock(_mutex);
5945 assert_status(status == 0, status, "mutex_lock");
5946 guarantee (_nParked == 0, "invariant") ;
5947 ++ _nParked ;
5948 while (_Event < 0) {
5949 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5950 assert_status(status == 0 || status == EINTR ||
5951 status == ETIME || status == ETIMEDOUT,
5952 status, "cond_timedwait");
5953 if (!FilterSpuriousWakeups) break ; // previous semantics
5954 if (status == ETIME || status == ETIMEDOUT) break ;
5955 // We consume and ignore EINTR and spurious wakeups.
5956 }
5957 -- _nParked ;
5958 if (_Event >= 0) ret = OS_OK ;
5959 _Event = 0 ;
5960 status = os::Solaris::mutex_unlock(_mutex);
5961 assert_status(status == 0, status, "mutex_unlock");
5962 return ret;
5963 }
5965 void os::PlatformEvent::unpark() {
5966 int v, AnyWaiters;
5968 // Increment _Event.
5969 // Another acceptable implementation would be to simply swap 1
5970 // into _Event:
5971 // if (Swap (&_Event, 1) < 0) {
5972 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ;
5973 // if (AnyWaiters) cond_signal (_cond) ;
5974 // }
5976 for (;;) {
5977 v = _Event ;
5978 if (v > 0) {
5979 // The LD of _Event could have reordered or be satisfied
5980 // by a read-aside from this processor's write buffer.
5981 // To avoid problems execute a barrier and then
5982 // ratify the value. A degenerate CAS() would also work.
5983 // Viz., CAS (v+0, &_Event, v) == v).
5984 OrderAccess::fence() ;
5985 if (_Event == v) return ;
5986 continue ;
5987 }
5988 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
5989 }
5991 // If the thread associated with the event was parked, wake it.
5992 if (v < 0) {
5993 int status ;
5994 // Wait for the thread assoc with the PlatformEvent to vacate.
5995 status = os::Solaris::mutex_lock(_mutex);
5996 assert_status(status == 0, status, "mutex_lock");
5997 AnyWaiters = _nParked ;
5998 status = os::Solaris::mutex_unlock(_mutex);
5999 assert_status(status == 0, status, "mutex_unlock");
6000 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
6001 if (AnyWaiters != 0) {
6002 // We intentional signal *after* dropping the lock
6003 // to avoid a common class of futile wakeups.
6004 status = os::Solaris::cond_signal(_cond);
6005 assert_status(status == 0, status, "cond_signal");
6006 }
6007 }
6008 }
6010 // JSR166
6011 // -------------------------------------------------------
6013 /*
6014 * The solaris and linux implementations of park/unpark are fairly
6015 * conservative for now, but can be improved. They currently use a
6016 * mutex/condvar pair, plus _counter.
6017 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6018 * sets count to 1 and signals condvar. Only one thread ever waits
6019 * on the condvar. Contention seen when trying to park implies that someone
6020 * is unparking you, so don't wait. And spurious returns are fine, so there
6021 * is no need to track notifications.
6022 */
6024 #define NANOSECS_PER_SEC 1000000000
6025 #define NANOSECS_PER_MILLISEC 1000000
6026 #define MAX_SECS 100000000
6028 /*
6029 * This code is common to linux and solaris and will be moved to a
6030 * common place in dolphin.
6031 *
6032 * The passed in time value is either a relative time in nanoseconds
6033 * or an absolute time in milliseconds. Either way it has to be unpacked
6034 * into suitable seconds and nanoseconds components and stored in the
6035 * given timespec structure.
6036 * Given time is a 64-bit value and the time_t used in the timespec is only
6037 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6038 * overflow if times way in the future are given. Further on Solaris versions
6039 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6040 * number of seconds, in abstime, is less than current_time + 100,000,000.
6041 * As it will be 28 years before "now + 100000000" will overflow we can
6042 * ignore overflow and just impose a hard-limit on seconds using the value
6043 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6044 * years from "now".
6045 */
6046 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6047 assert (time > 0, "convertTime");
6049 struct timeval now;
6050 int status = gettimeofday(&now, NULL);
6051 assert(status == 0, "gettimeofday");
6053 time_t max_secs = now.tv_sec + MAX_SECS;
6055 if (isAbsolute) {
6056 jlong secs = time / 1000;
6057 if (secs > max_secs) {
6058 absTime->tv_sec = max_secs;
6059 }
6060 else {
6061 absTime->tv_sec = secs;
6062 }
6063 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6064 }
6065 else {
6066 jlong secs = time / NANOSECS_PER_SEC;
6067 if (secs >= MAX_SECS) {
6068 absTime->tv_sec = max_secs;
6069 absTime->tv_nsec = 0;
6070 }
6071 else {
6072 absTime->tv_sec = now.tv_sec + secs;
6073 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6074 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6075 absTime->tv_nsec -= NANOSECS_PER_SEC;
6076 ++absTime->tv_sec; // note: this must be <= max_secs
6077 }
6078 }
6079 }
6080 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6081 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6082 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6083 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6084 }
6086 void Parker::park(bool isAbsolute, jlong time) {
6088 // Optional fast-path check:
6089 // Return immediately if a permit is available.
6090 if (_counter > 0) {
6091 _counter = 0 ;
6092 OrderAccess::fence();
6093 return ;
6094 }
6096 // Optional fast-exit: Check interrupt before trying to wait
6097 Thread* thread = Thread::current();
6098 assert(thread->is_Java_thread(), "Must be JavaThread");
6099 JavaThread *jt = (JavaThread *)thread;
6100 if (Thread::is_interrupted(thread, false)) {
6101 return;
6102 }
6104 // First, demultiplex/decode time arguments
6105 timespec absTime;
6106 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6107 return;
6108 }
6109 if (time > 0) {
6110 // Warning: this code might be exposed to the old Solaris time
6111 // round-down bugs. Grep "roundingFix" for details.
6112 unpackTime(&absTime, isAbsolute, time);
6113 }
6115 // Enter safepoint region
6116 // Beware of deadlocks such as 6317397.
6117 // The per-thread Parker:: _mutex is a classic leaf-lock.
6118 // In particular a thread must never block on the Threads_lock while
6119 // holding the Parker:: mutex. If safepoints are pending both the
6120 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6121 ThreadBlockInVM tbivm(jt);
6123 // Don't wait if cannot get lock since interference arises from
6124 // unblocking. Also. check interrupt before trying wait
6125 if (Thread::is_interrupted(thread, false) ||
6126 os::Solaris::mutex_trylock(_mutex) != 0) {
6127 return;
6128 }
6130 int status ;
6132 if (_counter > 0) { // no wait needed
6133 _counter = 0;
6134 status = os::Solaris::mutex_unlock(_mutex);
6135 assert (status == 0, "invariant") ;
6136 OrderAccess::fence();
6137 return;
6138 }
6140 #ifdef ASSERT
6141 // Don't catch signals while blocked; let the running threads have the signals.
6142 // (This allows a debugger to break into the running thread.)
6143 sigset_t oldsigs;
6144 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6145 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6146 #endif
6148 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6149 jt->set_suspend_equivalent();
6150 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6152 // Do this the hard way by blocking ...
6153 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6154 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6155 // Only for SPARC >= V8PlusA
6156 #if defined(__sparc) && defined(COMPILER2)
6157 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6158 #endif
6160 if (time == 0) {
6161 status = os::Solaris::cond_wait (_cond, _mutex) ;
6162 } else {
6163 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6164 }
6165 // Note that an untimed cond_wait() can sometimes return ETIME on older
6166 // versions of the Solaris.
6167 assert_status(status == 0 || status == EINTR ||
6168 status == ETIME || status == ETIMEDOUT,
6169 status, "cond_timedwait");
6171 #ifdef ASSERT
6172 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6173 #endif
6174 _counter = 0 ;
6175 status = os::Solaris::mutex_unlock(_mutex);
6176 assert_status(status == 0, status, "mutex_unlock") ;
6178 // If externally suspended while waiting, re-suspend
6179 if (jt->handle_special_suspend_equivalent_condition()) {
6180 jt->java_suspend_self();
6181 }
6182 OrderAccess::fence();
6183 }
6185 void Parker::unpark() {
6186 int s, status ;
6187 status = os::Solaris::mutex_lock (_mutex) ;
6188 assert (status == 0, "invariant") ;
6189 s = _counter;
6190 _counter = 1;
6191 status = os::Solaris::mutex_unlock (_mutex) ;
6192 assert (status == 0, "invariant") ;
6194 if (s < 1) {
6195 status = os::Solaris::cond_signal (_cond) ;
6196 assert (status == 0, "invariant") ;
6197 }
6198 }
6200 extern char** environ;
6202 // Run the specified command in a separate process. Return its exit value,
6203 // or -1 on failure (e.g. can't fork a new process).
6204 // Unlike system(), this function can be called from signal handler. It
6205 // doesn't block SIGINT et al.
6206 int os::fork_and_exec(char* cmd) {
6207 char * argv[4];
6208 argv[0] = (char *)"sh";
6209 argv[1] = (char *)"-c";
6210 argv[2] = cmd;
6211 argv[3] = NULL;
6213 // fork is async-safe, fork1 is not so can't use in signal handler
6214 pid_t pid;
6215 Thread* t = ThreadLocalStorage::get_thread_slow();
6216 if (t != NULL && t->is_inside_signal_handler()) {
6217 pid = fork();
6218 } else {
6219 pid = fork1();
6220 }
6222 if (pid < 0) {
6223 // fork failed
6224 warning("fork failed: %s", strerror(errno));
6225 return -1;
6227 } else if (pid == 0) {
6228 // child process
6230 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6231 execve("/usr/bin/sh", argv, environ);
6233 // execve failed
6234 _exit(-1);
6236 } else {
6237 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6238 // care about the actual exit code, for now.
6240 int status;
6242 // Wait for the child process to exit. This returns immediately if
6243 // the child has already exited. */
6244 while (waitpid(pid, &status, 0) < 0) {
6245 switch (errno) {
6246 case ECHILD: return 0;
6247 case EINTR: break;
6248 default: return -1;
6249 }
6250 }
6252 if (WIFEXITED(status)) {
6253 // The child exited normally; get its exit code.
6254 return WEXITSTATUS(status);
6255 } else if (WIFSIGNALED(status)) {
6256 // The child exited because of a signal
6257 // The best value to return is 0x80 + signal number,
6258 // because that is what all Unix shells do, and because
6259 // it allows callers to distinguish between process exit and
6260 // process death by signal.
6261 return 0x80 + WTERMSIG(status);
6262 } else {
6263 // Unknown exit code; pass it through
6264 return status;
6265 }
6266 }
6267 }
6269 // is_headless_jre()
6270 //
6271 // Test for the existence of libmawt in motif21 or xawt directories
6272 // in order to report if we are running in a headless jre
6273 //
6274 bool os::is_headless_jre() {
6275 struct stat statbuf;
6276 char buf[MAXPATHLEN];
6277 char libmawtpath[MAXPATHLEN];
6278 const char *xawtstr = "/xawt/libmawt.so";
6279 const char *motifstr = "/motif21/libmawt.so";
6280 char *p;
6282 // Get path to libjvm.so
6283 os::jvm_path(buf, sizeof(buf));
6285 // Get rid of libjvm.so
6286 p = strrchr(buf, '/');
6287 if (p == NULL) return false;
6288 else *p = '\0';
6290 // Get rid of client or server
6291 p = strrchr(buf, '/');
6292 if (p == NULL) return false;
6293 else *p = '\0';
6295 // check xawt/libmawt.so
6296 strcpy(libmawtpath, buf);
6297 strcat(libmawtpath, xawtstr);
6298 if (::stat(libmawtpath, &statbuf) == 0) return false;
6300 // check motif21/libmawt.so
6301 strcpy(libmawtpath, buf);
6302 strcat(libmawtpath, motifstr);
6303 if (::stat(libmawtpath, &statbuf) == 0) return false;
6305 return true;
6306 }
6308 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6309 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6310 }
6312 int os::close(int fd) {
6313 RESTARTABLE_RETURN_INT(::close(fd));
6314 }
6316 int os::socket_close(int fd) {
6317 RESTARTABLE_RETURN_INT(::close(fd));
6318 }
6320 int os::recv(int fd, char *buf, int nBytes, int flags) {
6321 INTERRUPTIBLE_RETURN_INT(::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6322 }
6325 int os::send(int fd, char *buf, int nBytes, int flags) {
6326 INTERRUPTIBLE_RETURN_INT(::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6327 }
6329 int os::raw_send(int fd, char *buf, int nBytes, int flags) {
6330 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
6331 }
6333 // As both poll and select can be interrupted by signals, we have to be
6334 // prepared to restart the system call after updating the timeout, unless
6335 // a poll() is done with timeout == -1, in which case we repeat with this
6336 // "wait forever" value.
6338 int os::timeout(int fd, long timeout) {
6339 int res;
6340 struct timeval t;
6341 julong prevtime, newtime;
6342 static const char* aNull = 0;
6343 struct pollfd pfd;
6344 pfd.fd = fd;
6345 pfd.events = POLLIN;
6347 gettimeofday(&t, &aNull);
6348 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6350 for(;;) {
6351 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6352 if(res == OS_ERR && errno == EINTR) {
6353 if(timeout != -1) {
6354 gettimeofday(&t, &aNull);
6355 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6356 timeout -= newtime - prevtime;
6357 if(timeout <= 0)
6358 return OS_OK;
6359 prevtime = newtime;
6360 }
6361 } else return res;
6362 }
6363 }
6365 int os::connect(int fd, struct sockaddr *him, int len) {
6366 int _result;
6367 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,
6368 os::Solaris::clear_interrupted);
6370 // Depending on when thread interruption is reset, _result could be
6371 // one of two values when errno == EINTR
6373 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6374 && (errno == EINTR)) {
6375 /* restarting a connect() changes its errno semantics */
6376 INTERRUPTIBLE(::connect(fd, him, len), _result,
6377 os::Solaris::clear_interrupted);
6378 /* undo these changes */
6379 if (_result == OS_ERR) {
6380 if (errno == EALREADY) {
6381 errno = EINPROGRESS; /* fall through */
6382 } else if (errno == EISCONN) {
6383 errno = 0;
6384 return OS_OK;
6385 }
6386 }
6387 }
6388 return _result;
6389 }
6391 int os::accept(int fd, struct sockaddr *him, int *len) {
6392 if (fd < 0)
6393 return OS_ERR;
6394 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him,\
6395 (socklen_t*) len), os::Solaris::clear_interrupted);
6396 }
6398 int os::recvfrom(int fd, char *buf, int nBytes, int flags,
6399 sockaddr *from, int *fromlen) {
6400 //%%note jvm_r11
6401 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes,\
6402 flags, from, fromlen), os::Solaris::clear_interrupted);
6403 }
6405 int os::sendto(int fd, char *buf, int len, int flags,
6406 struct sockaddr *to, int tolen) {
6407 //%%note jvm_r11
6408 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags,\
6409 to, tolen), os::Solaris::clear_interrupted);
6410 }
6412 int os::socket_available(int fd, jint *pbytes) {
6413 if (fd < 0)
6414 return OS_OK;
6416 int ret;
6418 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6420 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
6421 // is expected to return 0 on failure and 1 on success to the jdk.
6423 return (ret == OS_ERR) ? 0 : 1;
6424 }
6427 int os::bind(int fd, struct sockaddr *him, int len) {
6428 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6429 os::Solaris::clear_interrupted);
6430 }