Wed, 12 Jan 2011 13:59:18 -0800
7009828: Fix for 6938627 breaks visualvm monitoring when -Djava.io.tmpdir is defined
Summary: Change get_temp_directory() back to /tmp and %TEMP% like it always was and where the tools expect it to be.
Reviewed-by: phh, dcubed, kamg, alanb
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 Sym * info;
1979 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1980 RTLD_DL_SYMENT)) {
1981 if ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1982 if (buf != NULL) {
1983 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
1984 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1985 }
1986 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1987 return true;
1988 }
1989 }
1990 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1991 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1992 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) {
1993 return true;
1994 }
1995 }
1996 if (buf != NULL) buf[0] = '\0';
1997 if (offset != NULL) *offset = -1;
1998 return false;
1999 } else {
2000 // no, only dladdr is available
2001 if (dladdr((void *)addr, &dlinfo)) {
2002 if (buf != NULL) {
2003 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
2004 jio_snprintf(buf, buflen, dlinfo.dli_sname);
2005 }
2006 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
2007 return true;
2008 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
2009 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
2010 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) {
2011 return true;
2012 }
2013 }
2014 if (buf != NULL) buf[0] = '\0';
2015 if (offset != NULL) *offset = -1;
2016 return false;
2017 }
2018 }
2020 bool os::dll_address_to_library_name(address addr, char* buf,
2021 int buflen, int* offset) {
2022 Dl_info dlinfo;
2024 if (dladdr((void*)addr, &dlinfo)){
2025 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
2026 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
2027 return true;
2028 } else {
2029 if (buf) buf[0] = '\0';
2030 if (offset) *offset = -1;
2031 return false;
2032 }
2033 }
2035 // Prints the names and full paths of all opened dynamic libraries
2036 // for current process
2037 void os::print_dll_info(outputStream * st) {
2038 Dl_info dli;
2039 void *handle;
2040 Link_map *map;
2041 Link_map *p;
2043 st->print_cr("Dynamic libraries:"); st->flush();
2045 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
2046 st->print_cr("Error: Cannot print dynamic libraries.");
2047 return;
2048 }
2049 handle = dlopen(dli.dli_fname, RTLD_LAZY);
2050 if (handle == NULL) {
2051 st->print_cr("Error: Cannot print dynamic libraries.");
2052 return;
2053 }
2054 dlinfo(handle, RTLD_DI_LINKMAP, &map);
2055 if (map == NULL) {
2056 st->print_cr("Error: Cannot print dynamic libraries.");
2057 return;
2058 }
2060 while (map->l_prev != NULL)
2061 map = map->l_prev;
2063 while (map != NULL) {
2064 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2065 map = map->l_next;
2066 }
2068 dlclose(handle);
2069 }
2071 // Loads .dll/.so and
2072 // in case of error it checks if .dll/.so was built for the
2073 // same architecture as Hotspot is running on
2075 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2076 {
2077 void * result= ::dlopen(filename, RTLD_LAZY);
2078 if (result != NULL) {
2079 // Successful loading
2080 return result;
2081 }
2083 Elf32_Ehdr elf_head;
2085 // Read system error message into ebuf
2086 // It may or may not be overwritten below
2087 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2088 ebuf[ebuflen-1]='\0';
2089 int diag_msg_max_length=ebuflen-strlen(ebuf);
2090 char* diag_msg_buf=ebuf+strlen(ebuf);
2092 if (diag_msg_max_length==0) {
2093 // No more space in ebuf for additional diagnostics message
2094 return NULL;
2095 }
2098 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2100 if (file_descriptor < 0) {
2101 // Can't open library, report dlerror() message
2102 return NULL;
2103 }
2105 bool failed_to_read_elf_head=
2106 (sizeof(elf_head)!=
2107 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2109 ::close(file_descriptor);
2110 if (failed_to_read_elf_head) {
2111 // file i/o error - report dlerror() msg
2112 return NULL;
2113 }
2115 typedef struct {
2116 Elf32_Half code; // Actual value as defined in elf.h
2117 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2118 char elf_class; // 32 or 64 bit
2119 char endianess; // MSB or LSB
2120 char* name; // String representation
2121 } arch_t;
2123 static const arch_t arch_array[]={
2124 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2125 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2126 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2127 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2128 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2129 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2130 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2131 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2132 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2133 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2134 };
2136 #if (defined IA32)
2137 static Elf32_Half running_arch_code=EM_386;
2138 #elif (defined AMD64)
2139 static Elf32_Half running_arch_code=EM_X86_64;
2140 #elif (defined IA64)
2141 static Elf32_Half running_arch_code=EM_IA_64;
2142 #elif (defined __sparc) && (defined _LP64)
2143 static Elf32_Half running_arch_code=EM_SPARCV9;
2144 #elif (defined __sparc) && (!defined _LP64)
2145 static Elf32_Half running_arch_code=EM_SPARC;
2146 #elif (defined __powerpc64__)
2147 static Elf32_Half running_arch_code=EM_PPC64;
2148 #elif (defined __powerpc__)
2149 static Elf32_Half running_arch_code=EM_PPC;
2150 #elif (defined ARM)
2151 static Elf32_Half running_arch_code=EM_ARM;
2152 #else
2153 #error Method os::dll_load requires that one of following is defined:\
2154 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2155 #endif
2157 // Identify compatability class for VM's architecture and library's architecture
2158 // Obtain string descriptions for architectures
2160 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2161 int running_arch_index=-1;
2163 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2164 if (running_arch_code == arch_array[i].code) {
2165 running_arch_index = i;
2166 }
2167 if (lib_arch.code == arch_array[i].code) {
2168 lib_arch.compat_class = arch_array[i].compat_class;
2169 lib_arch.name = arch_array[i].name;
2170 }
2171 }
2173 assert(running_arch_index != -1,
2174 "Didn't find running architecture code (running_arch_code) in arch_array");
2175 if (running_arch_index == -1) {
2176 // Even though running architecture detection failed
2177 // we may still continue with reporting dlerror() message
2178 return NULL;
2179 }
2181 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2182 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2183 return NULL;
2184 }
2186 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2187 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2188 return NULL;
2189 }
2191 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2192 if ( lib_arch.name!=NULL ) {
2193 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2194 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2195 lib_arch.name, arch_array[running_arch_index].name);
2196 } else {
2197 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2198 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2199 lib_arch.code,
2200 arch_array[running_arch_index].name);
2201 }
2202 }
2204 return NULL;
2205 }
2207 void* os::dll_lookup(void* handle, const char* name) {
2208 return dlsym(handle, name);
2209 }
2211 int os::stat(const char *path, struct stat *sbuf) {
2212 char pathbuf[MAX_PATH];
2213 if (strlen(path) > MAX_PATH - 1) {
2214 errno = ENAMETOOLONG;
2215 return -1;
2216 }
2217 os::native_path(strcpy(pathbuf, path));
2218 return ::stat(pathbuf, sbuf);
2219 }
2221 static bool _print_ascii_file(const char* filename, outputStream* st) {
2222 int fd = ::open(filename, O_RDONLY);
2223 if (fd == -1) {
2224 return false;
2225 }
2227 char buf[32];
2228 int bytes;
2229 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2230 st->print_raw(buf, bytes);
2231 }
2233 ::close(fd);
2235 return true;
2236 }
2238 void os::print_os_info(outputStream* st) {
2239 st->print("OS:");
2241 if (!_print_ascii_file("/etc/release", st)) {
2242 st->print("Solaris");
2243 }
2244 st->cr();
2246 // kernel
2247 st->print("uname:");
2248 struct utsname name;
2249 uname(&name);
2250 st->print(name.sysname); st->print(" ");
2251 st->print(name.release); st->print(" ");
2252 st->print(name.version); st->print(" ");
2253 st->print(name.machine);
2255 // libthread
2256 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)");
2257 else st->print(" (T1 libthread)");
2258 st->cr();
2260 // rlimit
2261 st->print("rlimit:");
2262 struct rlimit rlim;
2264 st->print(" STACK ");
2265 getrlimit(RLIMIT_STACK, &rlim);
2266 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2267 else st->print("%uk", rlim.rlim_cur >> 10);
2269 st->print(", CORE ");
2270 getrlimit(RLIMIT_CORE, &rlim);
2271 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2272 else st->print("%uk", rlim.rlim_cur >> 10);
2274 st->print(", NOFILE ");
2275 getrlimit(RLIMIT_NOFILE, &rlim);
2276 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2277 else st->print("%d", rlim.rlim_cur);
2279 st->print(", AS ");
2280 getrlimit(RLIMIT_AS, &rlim);
2281 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2282 else st->print("%uk", rlim.rlim_cur >> 10);
2283 st->cr();
2285 // load average
2286 st->print("load average:");
2287 double loadavg[3];
2288 os::loadavg(loadavg, 3);
2289 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
2290 st->cr();
2291 }
2294 static bool check_addr0(outputStream* st) {
2295 jboolean status = false;
2296 int fd = ::open("/proc/self/map",O_RDONLY);
2297 if (fd >= 0) {
2298 prmap_t p;
2299 while(::read(fd, &p, sizeof(p)) > 0) {
2300 if (p.pr_vaddr == 0x0) {
2301 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2302 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2303 st->print("Access:");
2304 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2305 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2306 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2307 st->cr();
2308 status = true;
2309 }
2310 ::close(fd);
2311 }
2312 }
2313 return status;
2314 }
2316 void os::print_memory_info(outputStream* st) {
2317 st->print("Memory:");
2318 st->print(" %dk page", os::vm_page_size()>>10);
2319 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2320 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2321 st->cr();
2322 (void) check_addr0(st);
2323 }
2325 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2326 // but they're the same for all the solaris architectures that we support.
2327 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2328 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2329 "ILL_COPROC", "ILL_BADSTK" };
2331 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2332 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2333 "FPE_FLTINV", "FPE_FLTSUB" };
2335 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2337 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2339 void os::print_siginfo(outputStream* st, void* siginfo) {
2340 st->print("siginfo:");
2342 const int buflen = 100;
2343 char buf[buflen];
2344 siginfo_t *si = (siginfo_t*)siginfo;
2345 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2346 char *err = strerror(si->si_errno);
2347 if (si->si_errno != 0 && err != NULL) {
2348 st->print("si_errno=%s", err);
2349 } else {
2350 st->print("si_errno=%d", si->si_errno);
2351 }
2352 const int c = si->si_code;
2353 assert(c > 0, "unexpected si_code");
2354 switch (si->si_signo) {
2355 case SIGILL:
2356 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2357 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2358 break;
2359 case SIGFPE:
2360 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2361 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2362 break;
2363 case SIGSEGV:
2364 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2365 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2366 break;
2367 case SIGBUS:
2368 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2369 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2370 break;
2371 default:
2372 st->print(", si_code=%d", si->si_code);
2373 // no si_addr
2374 }
2376 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2377 UseSharedSpaces) {
2378 FileMapInfo* mapinfo = FileMapInfo::current_info();
2379 if (mapinfo->is_in_shared_space(si->si_addr)) {
2380 st->print("\n\nError accessing class data sharing archive." \
2381 " Mapped file inaccessible during execution, " \
2382 " possible disk/network problem.");
2383 }
2384 }
2385 st->cr();
2386 }
2388 // Moved from whole group, because we need them here for diagnostic
2389 // prints.
2390 #define OLDMAXSIGNUM 32
2391 static int Maxsignum = 0;
2392 static int *ourSigFlags = NULL;
2394 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2396 int os::Solaris::get_our_sigflags(int sig) {
2397 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2398 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2399 return ourSigFlags[sig];
2400 }
2402 void os::Solaris::set_our_sigflags(int sig, int flags) {
2403 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2404 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2405 ourSigFlags[sig] = flags;
2406 }
2409 static const char* get_signal_handler_name(address handler,
2410 char* buf, int buflen) {
2411 int offset;
2412 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2413 if (found) {
2414 // skip directory names
2415 const char *p1, *p2;
2416 p1 = buf;
2417 size_t len = strlen(os::file_separator());
2418 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2419 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2420 } else {
2421 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2422 }
2423 return buf;
2424 }
2426 static void print_signal_handler(outputStream* st, int sig,
2427 char* buf, size_t buflen) {
2428 struct sigaction sa;
2430 sigaction(sig, NULL, &sa);
2432 st->print("%s: ", os::exception_name(sig, buf, buflen));
2434 address handler = (sa.sa_flags & SA_SIGINFO)
2435 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2436 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2438 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2439 st->print("SIG_DFL");
2440 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2441 st->print("SIG_IGN");
2442 } else {
2443 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2444 }
2446 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2448 address rh = VMError::get_resetted_sighandler(sig);
2449 // May be, handler was resetted by VMError?
2450 if(rh != NULL) {
2451 handler = rh;
2452 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2453 }
2455 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2457 // Check: is it our handler?
2458 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2459 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2460 // It is our signal handler
2461 // check for flags
2462 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2463 st->print(
2464 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2465 os::Solaris::get_our_sigflags(sig));
2466 }
2467 }
2468 st->cr();
2469 }
2471 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2472 st->print_cr("Signal Handlers:");
2473 print_signal_handler(st, SIGSEGV, buf, buflen);
2474 print_signal_handler(st, SIGBUS , buf, buflen);
2475 print_signal_handler(st, SIGFPE , buf, buflen);
2476 print_signal_handler(st, SIGPIPE, buf, buflen);
2477 print_signal_handler(st, SIGXFSZ, buf, buflen);
2478 print_signal_handler(st, SIGILL , buf, buflen);
2479 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2480 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2481 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2482 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2483 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2484 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2485 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2486 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2487 }
2489 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2491 // Find the full path to the current module, libjvm.so or libjvm_g.so
2492 void os::jvm_path(char *buf, jint buflen) {
2493 // Error checking.
2494 if (buflen < MAXPATHLEN) {
2495 assert(false, "must use a large-enough buffer");
2496 buf[0] = '\0';
2497 return;
2498 }
2499 // Lazy resolve the path to current module.
2500 if (saved_jvm_path[0] != 0) {
2501 strcpy(buf, saved_jvm_path);
2502 return;
2503 }
2505 Dl_info dlinfo;
2506 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2507 assert(ret != 0, "cannot locate libjvm");
2508 realpath((char *)dlinfo.dli_fname, buf);
2510 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) {
2511 // Support for the gamma launcher. Typical value for buf is
2512 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2513 // the right place in the string, then assume we are installed in a JDK and
2514 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2515 // up the path so it looks like libjvm.so is installed there (append a
2516 // fake suffix hotspot/libjvm.so).
2517 const char *p = buf + strlen(buf) - 1;
2518 for (int count = 0; p > buf && count < 5; ++count) {
2519 for (--p; p > buf && *p != '/'; --p)
2520 /* empty */ ;
2521 }
2523 if (strncmp(p, "/jre/lib/", 9) != 0) {
2524 // Look for JAVA_HOME in the environment.
2525 char* java_home_var = ::getenv("JAVA_HOME");
2526 if (java_home_var != NULL && java_home_var[0] != 0) {
2527 char cpu_arch[12];
2528 char* jrelib_p;
2529 int len;
2530 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2531 #ifdef _LP64
2532 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2533 if (strcmp(cpu_arch, "sparc") == 0) {
2534 strcat(cpu_arch, "v9");
2535 } else if (strcmp(cpu_arch, "i386") == 0) {
2536 strcpy(cpu_arch, "amd64");
2537 }
2538 #endif
2539 // Check the current module name "libjvm.so" or "libjvm_g.so".
2540 p = strrchr(buf, '/');
2541 assert(strstr(p, "/libjvm") == p, "invalid library name");
2542 p = strstr(p, "_g") ? "_g" : "";
2544 realpath(java_home_var, buf);
2545 // determine if this is a legacy image or modules image
2546 // modules image doesn't have "jre" subdirectory
2547 len = strlen(buf);
2548 jrelib_p = buf + len;
2549 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2550 if (0 != access(buf, F_OK)) {
2551 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2552 }
2554 if (0 == access(buf, F_OK)) {
2555 // Use current module name "libjvm[_g].so" instead of
2556 // "libjvm"debug_only("_g")".so" since for fastdebug version
2557 // we should have "libjvm.so" but debug_only("_g") adds "_g"!
2558 len = strlen(buf);
2559 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p);
2560 } else {
2561 // Go back to path of .so
2562 realpath((char *)dlinfo.dli_fname, buf);
2563 }
2564 }
2565 }
2566 }
2568 strcpy(saved_jvm_path, buf);
2569 }
2572 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2573 // no prefix required, not even "_"
2574 }
2577 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2578 // no suffix required
2579 }
2581 // This method is a copy of JDK's sysGetLastErrorString
2582 // from src/solaris/hpi/src/system_md.c
2584 size_t os::lasterror(char *buf, size_t len) {
2586 if (errno == 0) return 0;
2588 const char *s = ::strerror(errno);
2589 size_t n = ::strlen(s);
2590 if (n >= len) {
2591 n = len - 1;
2592 }
2593 ::strncpy(buf, s, n);
2594 buf[n] = '\0';
2595 return n;
2596 }
2599 // sun.misc.Signal
2601 extern "C" {
2602 static void UserHandler(int sig, void *siginfo, void *context) {
2603 // Ctrl-C is pressed during error reporting, likely because the error
2604 // handler fails to abort. Let VM die immediately.
2605 if (sig == SIGINT && is_error_reported()) {
2606 os::die();
2607 }
2609 os::signal_notify(sig);
2610 // We do not need to reinstate the signal handler each time...
2611 }
2612 }
2614 void* os::user_handler() {
2615 return CAST_FROM_FN_PTR(void*, UserHandler);
2616 }
2618 extern "C" {
2619 typedef void (*sa_handler_t)(int);
2620 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2621 }
2623 void* os::signal(int signal_number, void* handler) {
2624 struct sigaction sigAct, oldSigAct;
2625 sigfillset(&(sigAct.sa_mask));
2626 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2627 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2629 if (sigaction(signal_number, &sigAct, &oldSigAct))
2630 // -1 means registration failed
2631 return (void *)-1;
2633 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2634 }
2636 void os::signal_raise(int signal_number) {
2637 raise(signal_number);
2638 }
2640 /*
2641 * The following code is moved from os.cpp for making this
2642 * code platform specific, which it is by its very nature.
2643 */
2645 // a counter for each possible signal value
2646 static int Sigexit = 0;
2647 static int Maxlibjsigsigs;
2648 static jint *pending_signals = NULL;
2649 static int *preinstalled_sigs = NULL;
2650 static struct sigaction *chainedsigactions = NULL;
2651 static sema_t sig_sem;
2652 typedef int (*version_getting_t)();
2653 version_getting_t os::Solaris::get_libjsig_version = NULL;
2654 static int libjsigversion = NULL;
2656 int os::sigexitnum_pd() {
2657 assert(Sigexit > 0, "signal memory not yet initialized");
2658 return Sigexit;
2659 }
2661 void os::Solaris::init_signal_mem() {
2662 // Initialize signal structures
2663 Maxsignum = SIGRTMAX;
2664 Sigexit = Maxsignum+1;
2665 assert(Maxsignum >0, "Unable to obtain max signal number");
2667 Maxlibjsigsigs = Maxsignum;
2669 // pending_signals has one int per signal
2670 // The additional signal is for SIGEXIT - exit signal to signal_thread
2671 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1));
2672 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2674 if (UseSignalChaining) {
2675 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2676 * (Maxsignum + 1));
2677 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2678 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1));
2679 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2680 }
2681 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ));
2682 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2683 }
2685 void os::signal_init_pd() {
2686 int ret;
2688 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2689 assert(ret == 0, "sema_init() failed");
2690 }
2692 void os::signal_notify(int signal_number) {
2693 int ret;
2695 Atomic::inc(&pending_signals[signal_number]);
2696 ret = ::sema_post(&sig_sem);
2697 assert(ret == 0, "sema_post() failed");
2698 }
2700 static int check_pending_signals(bool wait_for_signal) {
2701 int ret;
2702 while (true) {
2703 for (int i = 0; i < Sigexit + 1; i++) {
2704 jint n = pending_signals[i];
2705 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2706 return i;
2707 }
2708 }
2709 if (!wait_for_signal) {
2710 return -1;
2711 }
2712 JavaThread *thread = JavaThread::current();
2713 ThreadBlockInVM tbivm(thread);
2715 bool threadIsSuspended;
2716 do {
2717 thread->set_suspend_equivalent();
2718 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2719 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2720 ;
2721 assert(ret == 0, "sema_wait() failed");
2723 // were we externally suspended while we were waiting?
2724 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2725 if (threadIsSuspended) {
2726 //
2727 // The semaphore has been incremented, but while we were waiting
2728 // another thread suspended us. We don't want to continue running
2729 // while suspended because that would surprise the thread that
2730 // suspended us.
2731 //
2732 ret = ::sema_post(&sig_sem);
2733 assert(ret == 0, "sema_post() failed");
2735 thread->java_suspend_self();
2736 }
2737 } while (threadIsSuspended);
2738 }
2739 }
2741 int os::signal_lookup() {
2742 return check_pending_signals(false);
2743 }
2745 int os::signal_wait() {
2746 return check_pending_signals(true);
2747 }
2749 ////////////////////////////////////////////////////////////////////////////////
2750 // Virtual Memory
2752 static int page_size = -1;
2754 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2755 // clear this var if support is not available.
2756 static bool has_map_align = true;
2758 int os::vm_page_size() {
2759 assert(page_size != -1, "must call os::init");
2760 return page_size;
2761 }
2763 // Solaris allocates memory by pages.
2764 int os::vm_allocation_granularity() {
2765 assert(page_size != -1, "must call os::init");
2766 return page_size;
2767 }
2769 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2770 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2771 size_t size = bytes;
2772 return
2773 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2774 }
2776 bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2777 bool exec) {
2778 if (commit_memory(addr, bytes, exec)) {
2779 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2780 // If the large page size has been set and the VM
2781 // is using large pages, use the large page size
2782 // if it is smaller than the alignment hint. This is
2783 // a case where the VM wants to use a larger alignment size
2784 // for its own reasons but still want to use large pages
2785 // (which is what matters to setting the mpss range.
2786 size_t page_size = 0;
2787 if (large_page_size() < alignment_hint) {
2788 assert(UseLargePages, "Expected to be here for large page use only");
2789 page_size = large_page_size();
2790 } else {
2791 // If the alignment hint is less than the large page
2792 // size, the VM wants a particular alignment (thus the hint)
2793 // for internal reasons. Try to set the mpss range using
2794 // the alignment_hint.
2795 page_size = alignment_hint;
2796 }
2797 // Since this is a hint, ignore any failures.
2798 (void)Solaris::set_mpss_range(addr, bytes, page_size);
2799 }
2800 return true;
2801 }
2802 return false;
2803 }
2805 // Uncommit the pages in a specified region.
2806 void os::free_memory(char* addr, size_t bytes) {
2807 if (madvise(addr, bytes, MADV_FREE) < 0) {
2808 debug_only(warning("MADV_FREE failed."));
2809 return;
2810 }
2811 }
2813 bool os::create_stack_guard_pages(char* addr, size_t size) {
2814 return os::commit_memory(addr, size);
2815 }
2817 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2818 return os::uncommit_memory(addr, size);
2819 }
2821 // Change the page size in a given range.
2822 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2823 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2824 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2825 Solaris::set_mpss_range(addr, bytes, alignment_hint);
2826 }
2828 // Tell the OS to make the range local to the first-touching LWP
2829 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2830 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2831 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2832 debug_only(warning("MADV_ACCESS_LWP failed."));
2833 }
2834 }
2836 // Tell the OS that this range would be accessed from different LWPs.
2837 void os::numa_make_global(char *addr, size_t bytes) {
2838 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2839 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2840 debug_only(warning("MADV_ACCESS_MANY failed."));
2841 }
2842 }
2844 // Get the number of the locality groups.
2845 size_t os::numa_get_groups_num() {
2846 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2847 return n != -1 ? n : 1;
2848 }
2850 // Get a list of leaf locality groups. A leaf lgroup is group that
2851 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2852 // board. An LWP is assigned to one of these groups upon creation.
2853 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2854 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2855 ids[0] = 0;
2856 return 1;
2857 }
2858 int result_size = 0, top = 1, bottom = 0, cur = 0;
2859 for (int k = 0; k < size; k++) {
2860 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2861 (Solaris::lgrp_id_t*)&ids[top], size - top);
2862 if (r == -1) {
2863 ids[0] = 0;
2864 return 1;
2865 }
2866 if (!r) {
2867 // That's a leaf node.
2868 assert (bottom <= cur, "Sanity check");
2869 // Check if the node has memory
2870 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2871 NULL, 0, LGRP_RSRC_MEM) > 0) {
2872 ids[bottom++] = ids[cur];
2873 }
2874 }
2875 top += r;
2876 cur++;
2877 }
2878 if (bottom == 0) {
2879 // Handle a situation, when the OS reports no memory available.
2880 // Assume UMA architecture.
2881 ids[0] = 0;
2882 return 1;
2883 }
2884 return bottom;
2885 }
2887 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2888 bool os::numa_topology_changed() {
2889 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2890 if (is_stale != -1 && is_stale) {
2891 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2892 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2893 assert(c != 0, "Failure to initialize LGRP API");
2894 Solaris::set_lgrp_cookie(c);
2895 return true;
2896 }
2897 return false;
2898 }
2900 // Get the group id of the current LWP.
2901 int os::numa_get_group_id() {
2902 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2903 if (lgrp_id == -1) {
2904 return 0;
2905 }
2906 const int size = os::numa_get_groups_num();
2907 int *ids = (int*)alloca(size * sizeof(int));
2909 // Get the ids of all lgroups with memory; r is the count.
2910 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2911 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2912 if (r <= 0) {
2913 return 0;
2914 }
2915 return ids[os::random() % r];
2916 }
2918 // Request information about the page.
2919 bool os::get_page_info(char *start, page_info* info) {
2920 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2921 uint64_t addr = (uintptr_t)start;
2922 uint64_t outdata[2];
2923 uint_t validity = 0;
2925 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2926 return false;
2927 }
2929 info->size = 0;
2930 info->lgrp_id = -1;
2932 if ((validity & 1) != 0) {
2933 if ((validity & 2) != 0) {
2934 info->lgrp_id = outdata[0];
2935 }
2936 if ((validity & 4) != 0) {
2937 info->size = outdata[1];
2938 }
2939 return true;
2940 }
2941 return false;
2942 }
2944 // Scan the pages from start to end until a page different than
2945 // the one described in the info parameter is encountered.
2946 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2947 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2948 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2949 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2950 uint_t validity[MAX_MEMINFO_CNT];
2952 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2953 uint64_t p = (uint64_t)start;
2954 while (p < (uint64_t)end) {
2955 addrs[0] = p;
2956 size_t addrs_count = 1;
2957 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) {
2958 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2959 addrs_count++;
2960 }
2962 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2963 return NULL;
2964 }
2966 size_t i = 0;
2967 for (; i < addrs_count; i++) {
2968 if ((validity[i] & 1) != 0) {
2969 if ((validity[i] & 4) != 0) {
2970 if (outdata[types * i + 1] != page_expected->size) {
2971 break;
2972 }
2973 } else
2974 if (page_expected->size != 0) {
2975 break;
2976 }
2978 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2979 if (outdata[types * i] != page_expected->lgrp_id) {
2980 break;
2981 }
2982 }
2983 } else {
2984 return NULL;
2985 }
2986 }
2988 if (i != addrs_count) {
2989 if ((validity[i] & 2) != 0) {
2990 page_found->lgrp_id = outdata[types * i];
2991 } else {
2992 page_found->lgrp_id = -1;
2993 }
2994 if ((validity[i] & 4) != 0) {
2995 page_found->size = outdata[types * i + 1];
2996 } else {
2997 page_found->size = 0;
2998 }
2999 return (char*)addrs[i];
3000 }
3002 p = addrs[addrs_count - 1] + page_size;
3003 }
3004 return end;
3005 }
3007 bool os::uncommit_memory(char* addr, size_t bytes) {
3008 size_t size = bytes;
3009 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3010 // uncommitted page. Otherwise, the read/write might succeed if we
3011 // have enough swap space to back the physical page.
3012 return
3013 NULL != Solaris::mmap_chunk(addr, size,
3014 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
3015 PROT_NONE);
3016 }
3018 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
3019 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
3021 if (b == MAP_FAILED) {
3022 return NULL;
3023 }
3024 return b;
3025 }
3027 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3028 char* addr = requested_addr;
3029 int flags = MAP_PRIVATE | MAP_NORESERVE;
3031 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3033 if (fixed) {
3034 flags |= MAP_FIXED;
3035 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3036 flags |= MAP_ALIGN;
3037 addr = (char*) alignment_hint;
3038 }
3040 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3041 // uncommitted page. Otherwise, the read/write might succeed if we
3042 // have enough swap space to back the physical page.
3043 return mmap_chunk(addr, bytes, flags, PROT_NONE);
3044 }
3046 char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3047 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3049 guarantee(requested_addr == NULL || requested_addr == addr,
3050 "OS failed to return requested mmap address.");
3051 return addr;
3052 }
3054 // Reserve memory at an arbitrary address, only if that area is
3055 // available (and not reserved for something else).
3057 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3058 const int max_tries = 10;
3059 char* base[max_tries];
3060 size_t size[max_tries];
3062 // Solaris adds a gap between mmap'ed regions. The size of the gap
3063 // is dependent on the requested size and the MMU. Our initial gap
3064 // value here is just a guess and will be corrected later.
3065 bool had_top_overlap = false;
3066 bool have_adjusted_gap = false;
3067 size_t gap = 0x400000;
3069 // Assert only that the size is a multiple of the page size, since
3070 // that's all that mmap requires, and since that's all we really know
3071 // about at this low abstraction level. If we need higher alignment,
3072 // we can either pass an alignment to this method or verify alignment
3073 // in one of the methods further up the call chain. See bug 5044738.
3074 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3076 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3077 // Give it a try, if the kernel honors the hint we can return immediately.
3078 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3079 volatile int err = errno;
3080 if (addr == requested_addr) {
3081 return addr;
3082 } else if (addr != NULL) {
3083 unmap_memory(addr, bytes);
3084 }
3086 if (PrintMiscellaneous && Verbose) {
3087 char buf[256];
3088 buf[0] = '\0';
3089 if (addr == NULL) {
3090 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3091 }
3092 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
3093 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3094 "%s", bytes, requested_addr, addr, buf);
3095 }
3097 // Address hint method didn't work. Fall back to the old method.
3098 // In theory, once SNV becomes our oldest supported platform, this
3099 // code will no longer be needed.
3100 //
3101 // Repeatedly allocate blocks until the block is allocated at the
3102 // right spot. Give up after max_tries.
3103 int i;
3104 for (i = 0; i < max_tries; ++i) {
3105 base[i] = reserve_memory(bytes);
3107 if (base[i] != NULL) {
3108 // Is this the block we wanted?
3109 if (base[i] == requested_addr) {
3110 size[i] = bytes;
3111 break;
3112 }
3114 // check that the gap value is right
3115 if (had_top_overlap && !have_adjusted_gap) {
3116 size_t actual_gap = base[i-1] - base[i] - bytes;
3117 if (gap != actual_gap) {
3118 // adjust the gap value and retry the last 2 allocations
3119 assert(i > 0, "gap adjustment code problem");
3120 have_adjusted_gap = true; // adjust the gap only once, just in case
3121 gap = actual_gap;
3122 if (PrintMiscellaneous && Verbose) {
3123 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3124 }
3125 unmap_memory(base[i], bytes);
3126 unmap_memory(base[i-1], size[i-1]);
3127 i-=2;
3128 continue;
3129 }
3130 }
3132 // Does this overlap the block we wanted? Give back the overlapped
3133 // parts and try again.
3134 //
3135 // There is still a bug in this code: if top_overlap == bytes,
3136 // the overlap is offset from requested region by the value of gap.
3137 // In this case giving back the overlapped part will not work,
3138 // because we'll give back the entire block at base[i] and
3139 // therefore the subsequent allocation will not generate a new gap.
3140 // This could be fixed with a new algorithm that used larger
3141 // or variable size chunks to find the requested region -
3142 // but such a change would introduce additional complications.
3143 // It's rare enough that the planets align for this bug,
3144 // so we'll just wait for a fix for 6204603/5003415 which
3145 // will provide a mmap flag to allow us to avoid this business.
3147 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3148 if (top_overlap >= 0 && top_overlap < bytes) {
3149 had_top_overlap = true;
3150 unmap_memory(base[i], top_overlap);
3151 base[i] += top_overlap;
3152 size[i] = bytes - top_overlap;
3153 } else {
3154 size_t bottom_overlap = base[i] + bytes - requested_addr;
3155 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3156 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3157 warning("attempt_reserve_memory_at: possible alignment bug");
3158 }
3159 unmap_memory(requested_addr, bottom_overlap);
3160 size[i] = bytes - bottom_overlap;
3161 } else {
3162 size[i] = bytes;
3163 }
3164 }
3165 }
3166 }
3168 // Give back the unused reserved pieces.
3170 for (int j = 0; j < i; ++j) {
3171 if (base[j] != NULL) {
3172 unmap_memory(base[j], size[j]);
3173 }
3174 }
3176 return (i < max_tries) ? requested_addr : NULL;
3177 }
3179 bool os::release_memory(char* addr, size_t bytes) {
3180 size_t size = bytes;
3181 return munmap(addr, size) == 0;
3182 }
3184 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3185 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3186 "addr must be page aligned");
3187 int retVal = mprotect(addr, bytes, prot);
3188 return retVal == 0;
3189 }
3191 // Protect memory (Used to pass readonly pages through
3192 // JNI GetArray<type>Elements with empty arrays.)
3193 // Also, used for serialization page and for compressed oops null pointer
3194 // checking.
3195 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3196 bool is_committed) {
3197 unsigned int p = 0;
3198 switch (prot) {
3199 case MEM_PROT_NONE: p = PROT_NONE; break;
3200 case MEM_PROT_READ: p = PROT_READ; break;
3201 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3202 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3203 default:
3204 ShouldNotReachHere();
3205 }
3206 // is_committed is unused.
3207 return solaris_mprotect(addr, bytes, p);
3208 }
3210 // guard_memory and unguard_memory only happens within stack guard pages.
3211 // Since ISM pertains only to the heap, guard and unguard memory should not
3212 /// happen with an ISM region.
3213 bool os::guard_memory(char* addr, size_t bytes) {
3214 return solaris_mprotect(addr, bytes, PROT_NONE);
3215 }
3217 bool os::unguard_memory(char* addr, size_t bytes) {
3218 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3219 }
3221 // Large page support
3223 // UseLargePages is the master flag to enable/disable large page memory.
3224 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3225 // effects can be described in the following table:
3226 //
3227 // UseLargePages UseMPSS UseISM
3228 // false * * => UseLargePages is the master switch, turning
3229 // it off will turn off both UseMPSS and
3230 // UseISM. VM will not use large page memory
3231 // regardless the settings of UseMPSS/UseISM.
3232 // true false false => Unless future Solaris provides other
3233 // mechanism to use large page memory, this
3234 // combination is equivalent to -UseLargePages,
3235 // VM will not use large page memory
3236 // true true false => JVM will use MPSS for large page memory.
3237 // This is the default behavior.
3238 // true false true => JVM will use ISM for large page memory.
3239 // true true true => JVM will use ISM if it is available.
3240 // Otherwise, JVM will fall back to MPSS.
3241 // Becaues ISM is now available on all
3242 // supported Solaris versions, this combination
3243 // is equivalent to +UseISM -UseMPSS.
3245 typedef int (*getpagesizes_func_type) (size_t[], int);
3246 static size_t _large_page_size = 0;
3248 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3249 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3250 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3251 // can support multiple page sizes.
3253 // Don't bother to probe page size because getpagesizes() comes with MPSS.
3254 // ISM is only recommended on old Solaris where there is no MPSS support.
3255 // Simply choose a conservative value as default.
3256 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3257 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M)
3258 ARM_ONLY(2 * M);
3260 // ISM is available on all supported Solaris versions
3261 return true;
3262 }
3264 // Insertion sort for small arrays (descending order).
3265 static void insertion_sort_descending(size_t* array, int len) {
3266 for (int i = 0; i < len; i++) {
3267 size_t val = array[i];
3268 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3269 size_t tmp = array[key];
3270 array[key] = array[key - 1];
3271 array[key - 1] = tmp;
3272 }
3273 }
3274 }
3276 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3277 getpagesizes_func_type getpagesizes_func =
3278 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes"));
3279 if (getpagesizes_func == NULL) {
3280 if (warn) {
3281 warning("MPSS is not supported by the operating system.");
3282 }
3283 return false;
3284 }
3286 const unsigned int usable_count = VM_Version::page_size_count();
3287 if (usable_count == 1) {
3288 return false;
3289 }
3291 // Fill the array of page sizes.
3292 int n = getpagesizes_func(_page_sizes, page_sizes_max);
3293 assert(n > 0, "Solaris bug?");
3294 if (n == page_sizes_max) {
3295 // Add a sentinel value (necessary only if the array was completely filled
3296 // since it is static (zeroed at initialization)).
3297 _page_sizes[--n] = 0;
3298 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3299 }
3300 assert(_page_sizes[n] == 0, "missing sentinel");
3302 if (n == 1) return false; // Only one page size available.
3304 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3305 // select up to usable_count elements. First sort the array, find the first
3306 // acceptable value, then copy the usable sizes to the top of the array and
3307 // trim the rest. Make sure to include the default page size :-).
3308 //
3309 // A better policy could get rid of the 4M limit by taking the sizes of the
3310 // important VM memory regions (java heap and possibly the code cache) into
3311 // account.
3312 insertion_sort_descending(_page_sizes, n);
3313 const size_t size_limit =
3314 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3315 int beg;
3316 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3317 const int end = MIN2((int)usable_count, n) - 1;
3318 for (int cur = 0; cur < end; ++cur, ++beg) {
3319 _page_sizes[cur] = _page_sizes[beg];
3320 }
3321 _page_sizes[end] = vm_page_size();
3322 _page_sizes[end + 1] = 0;
3324 if (_page_sizes[end] > _page_sizes[end - 1]) {
3325 // Default page size is not the smallest; sort again.
3326 insertion_sort_descending(_page_sizes, end + 1);
3327 }
3328 *page_size = _page_sizes[0];
3330 return true;
3331 }
3333 bool os::large_page_init() {
3334 if (!UseLargePages) {
3335 UseISM = false;
3336 UseMPSS = false;
3337 return false;
3338 }
3340 // print a warning if any large page related flag is specified on command line
3341 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3342 !FLAG_IS_DEFAULT(UseISM) ||
3343 !FLAG_IS_DEFAULT(UseMPSS) ||
3344 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3345 UseISM = UseISM &&
3346 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3347 if (UseISM) {
3348 // ISM disables MPSS to be compatible with old JDK behavior
3349 UseMPSS = false;
3350 _page_sizes[0] = _large_page_size;
3351 _page_sizes[1] = vm_page_size();
3352 }
3354 UseMPSS = UseMPSS &&
3355 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3357 UseLargePages = UseISM || UseMPSS;
3358 return UseLargePages;
3359 }
3361 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3362 // Signal to OS that we want large pages for addresses
3363 // from addr, addr + bytes
3364 struct memcntl_mha mpss_struct;
3365 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3366 mpss_struct.mha_pagesize = align;
3367 mpss_struct.mha_flags = 0;
3368 if (memcntl(start, bytes, MC_HAT_ADVISE,
3369 (caddr_t) &mpss_struct, 0, 0) < 0) {
3370 debug_only(warning("Attempt to use MPSS failed."));
3371 return false;
3372 }
3373 return true;
3374 }
3376 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3377 // "exec" is passed in but not used. Creating the shared image for
3378 // the code cache doesn't have an SHM_X executable permission to check.
3379 assert(UseLargePages && UseISM, "only for ISM large pages");
3381 size_t size = bytes;
3382 char* retAddr = NULL;
3383 int shmid;
3384 key_t ismKey;
3386 bool warn_on_failure = UseISM &&
3387 (!FLAG_IS_DEFAULT(UseLargePages) ||
3388 !FLAG_IS_DEFAULT(UseISM) ||
3389 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3390 );
3391 char msg[128];
3393 ismKey = IPC_PRIVATE;
3395 // Create a large shared memory region to attach to based on size.
3396 // Currently, size is the total size of the heap
3397 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3398 if (shmid == -1){
3399 if (warn_on_failure) {
3400 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3401 warning(msg);
3402 }
3403 return NULL;
3404 }
3406 // Attach to the region
3407 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3408 int err = errno;
3410 // Remove shmid. If shmat() is successful, the actual shared memory segment
3411 // will be deleted when it's detached by shmdt() or when the process
3412 // terminates. If shmat() is not successful this will remove the shared
3413 // segment immediately.
3414 shmctl(shmid, IPC_RMID, NULL);
3416 if (retAddr == (char *) -1) {
3417 if (warn_on_failure) {
3418 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3419 warning(msg);
3420 }
3421 return NULL;
3422 }
3424 return retAddr;
3425 }
3427 bool os::release_memory_special(char* base, size_t bytes) {
3428 // detaching the SHM segment will also delete it, see reserve_memory_special()
3429 int rslt = shmdt(base);
3430 return rslt == 0;
3431 }
3433 size_t os::large_page_size() {
3434 return _large_page_size;
3435 }
3437 // MPSS allows application to commit large page memory on demand; with ISM
3438 // the entire memory region must be allocated as shared memory.
3439 bool os::can_commit_large_page_memory() {
3440 return UseISM ? false : true;
3441 }
3443 bool os::can_execute_large_page_memory() {
3444 return UseISM ? false : true;
3445 }
3447 static int os_sleep(jlong millis, bool interruptible) {
3448 const jlong limit = INT_MAX;
3449 jlong prevtime;
3450 int res;
3452 while (millis > limit) {
3453 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3454 return res;
3455 millis -= limit;
3456 }
3458 // Restart interrupted polls with new parameters until the proper delay
3459 // has been completed.
3461 prevtime = getTimeMillis();
3463 while (millis > 0) {
3464 jlong newtime;
3466 if (!interruptible) {
3467 // Following assert fails for os::yield_all:
3468 // assert(!thread->is_Java_thread(), "must not be java thread");
3469 res = poll(NULL, 0, millis);
3470 } else {
3471 JavaThread *jt = JavaThread::current();
3473 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3474 os::Solaris::clear_interrupted);
3475 }
3477 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3478 // thread.Interrupt.
3480 // See c/r 6751923. Poll can return 0 before time
3481 // has elapsed if time is set via clock_settime (as NTP does).
3482 // res == 0 if poll timed out (see man poll RETURN VALUES)
3483 // using the logic below checks that we really did
3484 // sleep at least "millis" if not we'll sleep again.
3485 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3486 newtime = getTimeMillis();
3487 assert(newtime >= prevtime, "time moving backwards");
3488 /* Doing prevtime and newtime in microseconds doesn't help precision,
3489 and trying to round up to avoid lost milliseconds can result in a
3490 too-short delay. */
3491 millis -= newtime - prevtime;
3492 if(millis <= 0)
3493 return OS_OK;
3494 prevtime = newtime;
3495 } else
3496 return res;
3497 }
3499 return OS_OK;
3500 }
3502 // Read calls from inside the vm need to perform state transitions
3503 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3504 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3505 }
3507 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3508 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3509 }
3511 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3512 assert(thread == Thread::current(), "thread consistency check");
3514 // TODO-FIXME: this should be removed.
3515 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3516 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3517 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3518 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3519 // is fooled into believing that the system is making progress. In the code below we block the
3520 // the watcher thread while safepoint is in progress so that it would not appear as though the
3521 // system is making progress.
3522 if (!Solaris::T2_libthread() &&
3523 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3524 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3525 // the entire safepoint, the watcher thread will line up here during the safepoint.
3526 Threads_lock->lock_without_safepoint_check();
3527 Threads_lock->unlock();
3528 }
3530 if (thread->is_Java_thread()) {
3531 // This is a JavaThread so we honor the _thread_blocked protocol
3532 // even for sleeps of 0 milliseconds. This was originally done
3533 // as a workaround for bug 4338139. However, now we also do it
3534 // to honor the suspend-equivalent protocol.
3536 JavaThread *jt = (JavaThread *) thread;
3537 ThreadBlockInVM tbivm(jt);
3539 jt->set_suspend_equivalent();
3540 // cleared by handle_special_suspend_equivalent_condition() or
3541 // java_suspend_self() via check_and_wait_while_suspended()
3543 int ret_code;
3544 if (millis <= 0) {
3545 thr_yield();
3546 ret_code = 0;
3547 } else {
3548 // The original sleep() implementation did not create an
3549 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3550 // I'm preserving that decision for now.
3551 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3553 ret_code = os_sleep(millis, interruptible);
3554 }
3556 // were we externally suspended while we were waiting?
3557 jt->check_and_wait_while_suspended();
3559 return ret_code;
3560 }
3562 // non-JavaThread from this point on:
3564 if (millis <= 0) {
3565 thr_yield();
3566 return 0;
3567 }
3569 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3571 return os_sleep(millis, interruptible);
3572 }
3574 int os::naked_sleep() {
3575 // %% make the sleep time an integer flag. for now use 1 millisec.
3576 return os_sleep(1, false);
3577 }
3579 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3580 void os::infinite_sleep() {
3581 while (true) { // sleep forever ...
3582 ::sleep(100); // ... 100 seconds at a time
3583 }
3584 }
3586 // Used to convert frequent JVM_Yield() to nops
3587 bool os::dont_yield() {
3588 if (DontYieldALot) {
3589 static hrtime_t last_time = 0;
3590 hrtime_t diff = getTimeNanos() - last_time;
3592 if (diff < DontYieldALotInterval * 1000000)
3593 return true;
3595 last_time += diff;
3597 return false;
3598 }
3599 else {
3600 return false;
3601 }
3602 }
3604 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3605 // the linux and win32 implementations do not. This should be checked.
3607 void os::yield() {
3608 // Yields to all threads with same or greater priority
3609 os::sleep(Thread::current(), 0, false);
3610 }
3612 // Note that yield semantics are defined by the scheduling class to which
3613 // the thread currently belongs. Typically, yield will _not yield to
3614 // other equal or higher priority threads that reside on the dispatch queues
3615 // of other CPUs.
3617 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3620 // On Solaris we found that yield_all doesn't always yield to all other threads.
3621 // There have been cases where there is a thread ready to execute but it doesn't
3622 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3623 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3624 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3625 // number of times yield_all is called in the one loop and increase the sleep
3626 // time after 8 attempts. If this fails too we increase the concurrency level
3627 // so that the starving thread would get an lwp
3629 void os::yield_all(int attempts) {
3630 // Yields to all threads, including threads with lower priorities
3631 if (attempts == 0) {
3632 os::sleep(Thread::current(), 1, false);
3633 } else {
3634 int iterations = attempts % 30;
3635 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3636 // thr_setconcurrency and _getconcurrency make sense only under T1.
3637 int noofLWPS = thr_getconcurrency();
3638 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3639 thr_setconcurrency(thr_getconcurrency() + 1);
3640 }
3641 } else if (iterations < 25) {
3642 os::sleep(Thread::current(), 1, false);
3643 } else {
3644 os::sleep(Thread::current(), 10, false);
3645 }
3646 }
3647 }
3649 // Called from the tight loops to possibly influence time-sharing heuristics
3650 void os::loop_breaker(int attempts) {
3651 os::yield_all(attempts);
3652 }
3655 // Interface for setting lwp priorities. If we are using T2 libthread,
3656 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3657 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3658 // function is meaningless in this mode so we must adjust the real lwp's priority
3659 // The routines below implement the getting and setting of lwp priorities.
3660 //
3661 // Note: There are three priority scales used on Solaris. Java priotities
3662 // which range from 1 to 10, libthread "thr_setprio" scale which range
3663 // from 0 to 127, and the current scheduling class of the process we
3664 // are running in. This is typically from -60 to +60.
3665 // The setting of the lwp priorities in done after a call to thr_setprio
3666 // so Java priorities are mapped to libthread priorities and we map from
3667 // the latter to lwp priorities. We don't keep priorities stored in
3668 // Java priorities since some of our worker threads want to set priorities
3669 // higher than all Java threads.
3670 //
3671 // For related information:
3672 // (1) man -s 2 priocntl
3673 // (2) man -s 4 priocntl
3674 // (3) man dispadmin
3675 // = librt.so
3676 // = libthread/common/rtsched.c - thrp_setlwpprio().
3677 // = ps -cL <pid> ... to validate priority.
3678 // = sched_get_priority_min and _max
3679 // pthread_create
3680 // sched_setparam
3681 // pthread_setschedparam
3682 //
3683 // Assumptions:
3684 // + We assume that all threads in the process belong to the same
3685 // scheduling class. IE. an homogenous process.
3686 // + Must be root or in IA group to change change "interactive" attribute.
3687 // Priocntl() will fail silently. The only indication of failure is when
3688 // we read-back the value and notice that it hasn't changed.
3689 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3690 // + For RT, change timeslice as well. Invariant:
3691 // constant "priority integral"
3692 // Konst == TimeSlice * (60-Priority)
3693 // Given a priority, compute appropriate timeslice.
3694 // + Higher numerical values have higher priority.
3696 // sched class attributes
3697 typedef struct {
3698 int schedPolicy; // classID
3699 int maxPrio;
3700 int minPrio;
3701 } SchedInfo;
3704 static SchedInfo tsLimits, iaLimits, rtLimits;
3706 #ifdef ASSERT
3707 static int ReadBackValidate = 1;
3708 #endif
3709 static int myClass = 0;
3710 static int myMin = 0;
3711 static int myMax = 0;
3712 static int myCur = 0;
3713 static bool priocntl_enable = false;
3716 // Call the version of priocntl suitable for all supported versions
3717 // of Solaris. We need to call through this wrapper so that we can
3718 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3719 //
3720 // This code should be removed if we ever stop supporting Solaris 8
3721 // and earlier releases.
3723 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3724 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3725 static priocntl_type priocntl_ptr = priocntl_stub;
3727 // Stub to set the value of the real pointer, and then call the real
3728 // function.
3730 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3731 // Try Solaris 8- name only.
3732 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3733 guarantee(tmp != NULL, "priocntl function not found.");
3734 priocntl_ptr = tmp;
3735 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3736 }
3739 // lwp_priocntl_init
3740 //
3741 // Try to determine the priority scale for our process.
3742 //
3743 // Return errno or 0 if OK.
3744 //
3745 static
3746 int lwp_priocntl_init ()
3747 {
3748 int rslt;
3749 pcinfo_t ClassInfo;
3750 pcparms_t ParmInfo;
3751 int i;
3753 if (!UseThreadPriorities) return 0;
3755 // We are using Bound threads, we need to determine our priority ranges
3756 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3757 // If ThreadPriorityPolicy is 1, switch tables
3758 if (ThreadPriorityPolicy == 1) {
3759 for (i = 0 ; i < MaxPriority+1; i++)
3760 os::java_to_os_priority[i] = prio_policy1[i];
3761 }
3762 }
3763 // Not using Bound Threads, set to ThreadPolicy 1
3764 else {
3765 for ( i = 0 ; i < MaxPriority+1; i++ ) {
3766 os::java_to_os_priority[i] = prio_policy1[i];
3767 }
3768 return 0;
3769 }
3772 // Get IDs for a set of well-known scheduling classes.
3773 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3774 // the system. We should have a loop that iterates over the
3775 // classID values, which are known to be "small" integers.
3777 strcpy(ClassInfo.pc_clname, "TS");
3778 ClassInfo.pc_cid = -1;
3779 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3780 if (rslt < 0) return errno;
3781 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3782 tsLimits.schedPolicy = ClassInfo.pc_cid;
3783 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3784 tsLimits.minPrio = -tsLimits.maxPrio;
3786 strcpy(ClassInfo.pc_clname, "IA");
3787 ClassInfo.pc_cid = -1;
3788 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3789 if (rslt < 0) return errno;
3790 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3791 iaLimits.schedPolicy = ClassInfo.pc_cid;
3792 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3793 iaLimits.minPrio = -iaLimits.maxPrio;
3795 strcpy(ClassInfo.pc_clname, "RT");
3796 ClassInfo.pc_cid = -1;
3797 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3798 if (rslt < 0) return errno;
3799 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3800 rtLimits.schedPolicy = ClassInfo.pc_cid;
3801 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3802 rtLimits.minPrio = 0;
3805 // Query our "current" scheduling class.
3806 // This will normally be IA,TS or, rarely, RT.
3807 memset (&ParmInfo, 0, sizeof(ParmInfo));
3808 ParmInfo.pc_cid = PC_CLNULL;
3809 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo );
3810 if ( rslt < 0 ) return errno;
3811 myClass = ParmInfo.pc_cid;
3813 // We now know our scheduling classId, get specific information
3814 // the class.
3815 ClassInfo.pc_cid = myClass;
3816 ClassInfo.pc_clname[0] = 0;
3817 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo );
3818 if ( rslt < 0 ) return errno;
3820 if (ThreadPriorityVerbose)
3821 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3823 memset(&ParmInfo, 0, sizeof(pcparms_t));
3824 ParmInfo.pc_cid = PC_CLNULL;
3825 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3826 if (rslt < 0) return errno;
3828 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3829 myMin = rtLimits.minPrio;
3830 myMax = rtLimits.maxPrio;
3831 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3832 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3833 myMin = iaLimits.minPrio;
3834 myMax = iaLimits.maxPrio;
3835 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3836 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3837 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3838 myMin = tsLimits.minPrio;
3839 myMax = tsLimits.maxPrio;
3840 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3841 } else {
3842 // No clue - punt
3843 if (ThreadPriorityVerbose)
3844 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3845 return EINVAL; // no clue, punt
3846 }
3848 if (ThreadPriorityVerbose)
3849 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3851 priocntl_enable = true; // Enable changing priorities
3852 return 0;
3853 }
3855 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3856 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3857 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3860 // scale_to_lwp_priority
3861 //
3862 // Convert from the libthread "thr_setprio" scale to our current
3863 // lwp scheduling class scale.
3864 //
3865 static
3866 int scale_to_lwp_priority (int rMin, int rMax, int x)
3867 {
3868 int v;
3870 if (x == 127) return rMax; // avoid round-down
3871 v = (((x*(rMax-rMin)))/128)+rMin;
3872 return v;
3873 }
3876 // set_lwp_priority
3877 //
3878 // Set the priority of the lwp. This call should only be made
3879 // when using bound threads (T2 threads are bound by default).
3880 //
3881 int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
3882 {
3883 int rslt;
3884 int Actual, Expected, prv;
3885 pcparms_t ParmInfo; // for GET-SET
3886 #ifdef ASSERT
3887 pcparms_t ReadBack; // for readback
3888 #endif
3890 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3891 // Query current values.
3892 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3893 // Cache "pcparms_t" in global ParmCache.
3894 // TODO: elide set-to-same-value
3896 // If something went wrong on init, don't change priorities.
3897 if ( !priocntl_enable ) {
3898 if (ThreadPriorityVerbose)
3899 tty->print_cr("Trying to set priority but init failed, ignoring");
3900 return EINVAL;
3901 }
3904 // If lwp hasn't started yet, just return
3905 // the _start routine will call us again.
3906 if ( lwpid <= 0 ) {
3907 if (ThreadPriorityVerbose) {
3908 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set",
3909 ThreadID, newPrio);
3910 }
3911 return 0;
3912 }
3914 if (ThreadPriorityVerbose) {
3915 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3916 ThreadID, lwpid, newPrio);
3917 }
3919 memset(&ParmInfo, 0, sizeof(pcparms_t));
3920 ParmInfo.pc_cid = PC_CLNULL;
3921 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3922 if (rslt < 0) return errno;
3924 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3925 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3926 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio);
3927 rtInfo->rt_tqsecs = RT_NOCHANGE;
3928 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3929 if (ThreadPriorityVerbose) {
3930 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3931 }
3932 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3933 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3934 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim);
3935 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio);
3936 iaInfo->ia_uprilim = IA_NOCHANGE;
3937 iaInfo->ia_mode = IA_NOCHANGE;
3938 if (ThreadPriorityVerbose) {
3939 tty->print_cr ("IA: [%d...%d] %d->%d\n",
3940 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3941 }
3942 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3943 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3944 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim);
3945 prv = tsInfo->ts_upri;
3946 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio);
3947 tsInfo->ts_uprilim = IA_NOCHANGE;
3948 if (ThreadPriorityVerbose) {
3949 tty->print_cr ("TS: %d [%d...%d] %d->%d\n",
3950 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3951 }
3952 if (prv == tsInfo->ts_upri) return 0;
3953 } else {
3954 if ( ThreadPriorityVerbose ) {
3955 tty->print_cr ("Unknown scheduling class\n");
3956 }
3957 return EINVAL; // no clue, punt
3958 }
3960 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3961 if (ThreadPriorityVerbose && rslt) {
3962 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3963 }
3964 if (rslt < 0) return errno;
3966 #ifdef ASSERT
3967 // Sanity check: read back what we just attempted to set.
3968 // In theory it could have changed in the interim ...
3969 //
3970 // The priocntl system call is tricky.
3971 // Sometimes it'll validate the priority value argument and
3972 // return EINVAL if unhappy. At other times it fails silently.
3973 // Readbacks are prudent.
3975 if (!ReadBackValidate) return 0;
3977 memset(&ReadBack, 0, sizeof(pcparms_t));
3978 ReadBack.pc_cid = PC_CLNULL;
3979 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3980 assert(rslt >= 0, "priocntl failed");
3981 Actual = Expected = 0xBAD;
3982 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3983 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3984 Actual = RTPRI(ReadBack)->rt_pri;
3985 Expected = RTPRI(ParmInfo)->rt_pri;
3986 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3987 Actual = IAPRI(ReadBack)->ia_upri;
3988 Expected = IAPRI(ParmInfo)->ia_upri;
3989 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3990 Actual = TSPRI(ReadBack)->ts_upri;
3991 Expected = TSPRI(ParmInfo)->ts_upri;
3992 } else {
3993 if ( ThreadPriorityVerbose ) {
3994 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid);
3995 }
3996 }
3998 if (Actual != Expected) {
3999 if ( ThreadPriorityVerbose ) {
4000 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
4001 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
4002 }
4003 }
4004 #endif
4006 return 0;
4007 }
4011 // Solaris only gives access to 128 real priorities at a time,
4012 // so we expand Java's ten to fill this range. This would be better
4013 // if we dynamically adjusted relative priorities.
4014 //
4015 // The ThreadPriorityPolicy option allows us to select 2 different
4016 // priority scales.
4017 //
4018 // ThreadPriorityPolicy=0
4019 // Since the Solaris' default priority is MaximumPriority, we do not
4020 // set a priority lower than Max unless a priority lower than
4021 // NormPriority is requested.
4022 //
4023 // ThreadPriorityPolicy=1
4024 // This mode causes the priority table to get filled with
4025 // linear values. NormPriority get's mapped to 50% of the
4026 // Maximum priority an so on. This will cause VM threads
4027 // to get unfair treatment against other Solaris processes
4028 // which do not explicitly alter their thread priorities.
4029 //
4032 int os::java_to_os_priority[MaxPriority + 1] = {
4033 -99999, // 0 Entry should never be used
4035 0, // 1 MinPriority
4036 32, // 2
4037 64, // 3
4039 96, // 4
4040 127, // 5 NormPriority
4041 127, // 6
4043 127, // 7
4044 127, // 8
4045 127, // 9 NearMaxPriority
4047 127 // 10 MaxPriority
4048 };
4051 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4052 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4053 if ( !UseThreadPriorities ) return OS_OK;
4054 int status = thr_setprio(thread->osthread()->thread_id(), newpri);
4055 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) )
4056 status |= (set_lwp_priority (thread->osthread()->thread_id(),
4057 thread->osthread()->lwp_id(), newpri ));
4058 return (status == 0) ? OS_OK : OS_ERR;
4059 }
4062 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4063 int p;
4064 if ( !UseThreadPriorities ) {
4065 *priority_ptr = NormalPriority;
4066 return OS_OK;
4067 }
4068 int status = thr_getprio(thread->osthread()->thread_id(), &p);
4069 if (status != 0) {
4070 return OS_ERR;
4071 }
4072 *priority_ptr = p;
4073 return OS_OK;
4074 }
4077 // Hint to the underlying OS that a task switch would not be good.
4078 // Void return because it's a hint and can fail.
4079 void os::hint_no_preempt() {
4080 schedctl_start(schedctl_init());
4081 }
4083 void os::interrupt(Thread* thread) {
4084 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4086 OSThread* osthread = thread->osthread();
4088 int isInterrupted = osthread->interrupted();
4089 if (!isInterrupted) {
4090 osthread->set_interrupted(true);
4091 OrderAccess::fence();
4092 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4093 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4094 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4095 ParkEvent * const slp = thread->_SleepEvent ;
4096 if (slp != NULL) slp->unpark() ;
4097 }
4099 // For JSR166: unpark after setting status but before thr_kill -dl
4100 if (thread->is_Java_thread()) {
4101 ((JavaThread*)thread)->parker()->unpark();
4102 }
4104 // Handle interruptible wait() ...
4105 ParkEvent * const ev = thread->_ParkEvent ;
4106 if (ev != NULL) ev->unpark() ;
4108 // When events are used everywhere for os::sleep, then this thr_kill
4109 // will only be needed if UseVMInterruptibleIO is true.
4111 if (!isInterrupted) {
4112 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4113 assert_status(status == 0, status, "thr_kill");
4115 // Bump thread interruption counter
4116 RuntimeService::record_thread_interrupt_signaled_count();
4117 }
4118 }
4121 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4122 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4124 OSThread* osthread = thread->osthread();
4126 bool res = osthread->interrupted();
4128 // NOTE that since there is no "lock" around these two operations,
4129 // there is the possibility that the interrupted flag will be
4130 // "false" but that the interrupt event will be set. This is
4131 // intentional. The effect of this is that Object.wait() will appear
4132 // to have a spurious wakeup, which is not harmful, and the
4133 // possibility is so rare that it is not worth the added complexity
4134 // to add yet another lock. It has also been recommended not to put
4135 // the interrupted flag into the os::Solaris::Event structure,
4136 // because it hides the issue.
4137 if (res && clear_interrupted) {
4138 osthread->set_interrupted(false);
4139 }
4140 return res;
4141 }
4144 void os::print_statistics() {
4145 }
4147 int os::message_box(const char* title, const char* message) {
4148 int i;
4149 fdStream err(defaultStream::error_fd());
4150 for (i = 0; i < 78; i++) err.print_raw("=");
4151 err.cr();
4152 err.print_raw_cr(title);
4153 for (i = 0; i < 78; i++) err.print_raw("-");
4154 err.cr();
4155 err.print_raw_cr(message);
4156 for (i = 0; i < 78; i++) err.print_raw("=");
4157 err.cr();
4159 char buf[16];
4160 // Prevent process from exiting upon "read error" without consuming all CPU
4161 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4163 return buf[0] == 'y' || buf[0] == 'Y';
4164 }
4166 // A lightweight implementation that does not suspend the target thread and
4167 // thus returns only a hint. Used for profiling only!
4168 ExtendedPC os::get_thread_pc(Thread* thread) {
4169 // Make sure that it is called by the watcher and the Threads lock is owned.
4170 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4171 // For now, is only used to profile the VM Thread
4172 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4173 ExtendedPC epc;
4175 GetThreadPC_Callback cb(ProfileVM_lock);
4176 OSThread *osthread = thread->osthread();
4177 const int time_to_wait = 400; // 400ms wait for initial response
4178 int status = cb.interrupt(thread, time_to_wait);
4180 if (cb.is_done() ) {
4181 epc = cb.addr();
4182 } else {
4183 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4184 osthread->thread_id(), status););
4185 // epc is already NULL
4186 }
4187 return epc;
4188 }
4191 // This does not do anything on Solaris. This is basically a hook for being
4192 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4193 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4194 f(value, method, args, thread);
4195 }
4197 // This routine may be used by user applications as a "hook" to catch signals.
4198 // The user-defined signal handler must pass unrecognized signals to this
4199 // routine, and if it returns true (non-zero), then the signal handler must
4200 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4201 // routine will never retun false (zero), but instead will execute a VM panic
4202 // routine kill the process.
4203 //
4204 // If this routine returns false, it is OK to call it again. This allows
4205 // the user-defined signal handler to perform checks either before or after
4206 // the VM performs its own checks. Naturally, the user code would be making
4207 // a serious error if it tried to handle an exception (such as a null check
4208 // or breakpoint) that the VM was generating for its own correct operation.
4209 //
4210 // This routine may recognize any of the following kinds of signals:
4211 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4212 // os::Solaris::SIGasync
4213 // It should be consulted by handlers for any of those signals.
4214 // It explicitly does not recognize os::Solaris::SIGinterrupt
4215 //
4216 // The caller of this routine must pass in the three arguments supplied
4217 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4218 // field of the structure passed to sigaction(). This routine assumes that
4219 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4220 //
4221 // Note that the VM will print warnings if it detects conflicting signal
4222 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4223 //
4224 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
4227 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4228 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4229 }
4231 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4232 is needed to provoke threads blocked on IO to return an EINTR
4233 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4234 does NOT participate in signal chaining due to requirement for
4235 NOT setting SA_RESTART to make EINTR work. */
4236 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4237 if (UseSignalChaining) {
4238 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4239 if (actp && actp->sa_handler) {
4240 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4241 }
4242 }
4243 }
4245 // This boolean allows users to forward their own non-matching signals
4246 // to JVM_handle_solaris_signal, harmlessly.
4247 bool os::Solaris::signal_handlers_are_installed = false;
4249 // For signal-chaining
4250 bool os::Solaris::libjsig_is_loaded = false;
4251 typedef struct sigaction *(*get_signal_t)(int);
4252 get_signal_t os::Solaris::get_signal_action = NULL;
4254 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4255 struct sigaction *actp = NULL;
4257 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4258 // Retrieve the old signal handler from libjsig
4259 actp = (*get_signal_action)(sig);
4260 }
4261 if (actp == NULL) {
4262 // Retrieve the preinstalled signal handler from jvm
4263 actp = get_preinstalled_handler(sig);
4264 }
4266 return actp;
4267 }
4269 static bool call_chained_handler(struct sigaction *actp, int sig,
4270 siginfo_t *siginfo, void *context) {
4271 // Call the old signal handler
4272 if (actp->sa_handler == SIG_DFL) {
4273 // It's more reasonable to let jvm treat it as an unexpected exception
4274 // instead of taking the default action.
4275 return false;
4276 } else if (actp->sa_handler != SIG_IGN) {
4277 if ((actp->sa_flags & SA_NODEFER) == 0) {
4278 // automaticlly block the signal
4279 sigaddset(&(actp->sa_mask), sig);
4280 }
4282 sa_handler_t hand;
4283 sa_sigaction_t sa;
4284 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4285 // retrieve the chained handler
4286 if (siginfo_flag_set) {
4287 sa = actp->sa_sigaction;
4288 } else {
4289 hand = actp->sa_handler;
4290 }
4292 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4293 actp->sa_handler = SIG_DFL;
4294 }
4296 // try to honor the signal mask
4297 sigset_t oset;
4298 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4300 // call into the chained handler
4301 if (siginfo_flag_set) {
4302 (*sa)(sig, siginfo, context);
4303 } else {
4304 (*hand)(sig);
4305 }
4307 // restore the signal mask
4308 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4309 }
4310 // Tell jvm's signal handler the signal is taken care of.
4311 return true;
4312 }
4314 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4315 bool chained = false;
4316 // signal-chaining
4317 if (UseSignalChaining) {
4318 struct sigaction *actp = get_chained_signal_action(sig);
4319 if (actp != NULL) {
4320 chained = call_chained_handler(actp, sig, siginfo, context);
4321 }
4322 }
4323 return chained;
4324 }
4326 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4327 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4328 if (preinstalled_sigs[sig] != 0) {
4329 return &chainedsigactions[sig];
4330 }
4331 return NULL;
4332 }
4334 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4336 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4337 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4338 chainedsigactions[sig] = oldAct;
4339 preinstalled_sigs[sig] = 1;
4340 }
4342 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4343 // Check for overwrite.
4344 struct sigaction oldAct;
4345 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4346 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4347 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4348 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4349 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4350 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4351 if (AllowUserSignalHandlers || !set_installed) {
4352 // Do not overwrite; user takes responsibility to forward to us.
4353 return;
4354 } else if (UseSignalChaining) {
4355 if (oktochain) {
4356 // save the old handler in jvm
4357 save_preinstalled_handler(sig, oldAct);
4358 } else {
4359 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4360 }
4361 // libjsig also interposes the sigaction() call below and saves the
4362 // old sigaction on it own.
4363 } else {
4364 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4365 "%#lx for signal %d.", (long)oldhand, sig));
4366 }
4367 }
4369 struct sigaction sigAct;
4370 sigfillset(&(sigAct.sa_mask));
4371 sigAct.sa_handler = SIG_DFL;
4373 sigAct.sa_sigaction = signalHandler;
4374 // Handle SIGSEGV on alternate signal stack if
4375 // not using stack banging
4376 if (!UseStackBanging && sig == SIGSEGV) {
4377 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4378 // Interruptible i/o requires SA_RESTART cleared so EINTR
4379 // is returned instead of restarting system calls
4380 } else if (sig == os::Solaris::SIGinterrupt()) {
4381 sigemptyset(&sigAct.sa_mask);
4382 sigAct.sa_handler = NULL;
4383 sigAct.sa_flags = SA_SIGINFO;
4384 sigAct.sa_sigaction = sigINTRHandler;
4385 } else {
4386 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4387 }
4388 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4390 sigaction(sig, &sigAct, &oldAct);
4392 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4393 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4394 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4395 }
4398 #define DO_SIGNAL_CHECK(sig) \
4399 if (!sigismember(&check_signal_done, sig)) \
4400 os::Solaris::check_signal_handler(sig)
4402 // This method is a periodic task to check for misbehaving JNI applications
4403 // under CheckJNI, we can add any periodic checks here
4405 void os::run_periodic_checks() {
4406 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4407 // thereby preventing a NULL checks.
4408 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4410 if (check_signals == false) return;
4412 // SEGV and BUS if overridden could potentially prevent
4413 // generation of hs*.log in the event of a crash, debugging
4414 // such a case can be very challenging, so we absolutely
4415 // check for the following for a good measure:
4416 DO_SIGNAL_CHECK(SIGSEGV);
4417 DO_SIGNAL_CHECK(SIGILL);
4418 DO_SIGNAL_CHECK(SIGFPE);
4419 DO_SIGNAL_CHECK(SIGBUS);
4420 DO_SIGNAL_CHECK(SIGPIPE);
4421 DO_SIGNAL_CHECK(SIGXFSZ);
4423 // ReduceSignalUsage allows the user to override these handlers
4424 // see comments at the very top and jvm_solaris.h
4425 if (!ReduceSignalUsage) {
4426 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4427 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4428 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4429 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4430 }
4432 // See comments above for using JVM1/JVM2 and UseAltSigs
4433 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4434 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4436 }
4438 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4440 static os_sigaction_t os_sigaction = NULL;
4442 void os::Solaris::check_signal_handler(int sig) {
4443 char buf[O_BUFLEN];
4444 address jvmHandler = NULL;
4446 struct sigaction act;
4447 if (os_sigaction == NULL) {
4448 // only trust the default sigaction, in case it has been interposed
4449 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4450 if (os_sigaction == NULL) return;
4451 }
4453 os_sigaction(sig, (struct sigaction*)NULL, &act);
4455 address thisHandler = (act.sa_flags & SA_SIGINFO)
4456 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4457 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4460 switch(sig) {
4461 case SIGSEGV:
4462 case SIGBUS:
4463 case SIGFPE:
4464 case SIGPIPE:
4465 case SIGXFSZ:
4466 case SIGILL:
4467 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4468 break;
4470 case SHUTDOWN1_SIGNAL:
4471 case SHUTDOWN2_SIGNAL:
4472 case SHUTDOWN3_SIGNAL:
4473 case BREAK_SIGNAL:
4474 jvmHandler = (address)user_handler();
4475 break;
4477 default:
4478 int intrsig = os::Solaris::SIGinterrupt();
4479 int asynsig = os::Solaris::SIGasync();
4481 if (sig == intrsig) {
4482 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4483 } else if (sig == asynsig) {
4484 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4485 } else {
4486 return;
4487 }
4488 break;
4489 }
4492 if (thisHandler != jvmHandler) {
4493 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4494 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4495 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4496 // No need to check this sig any longer
4497 sigaddset(&check_signal_done, sig);
4498 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4499 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4500 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4501 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4502 // No need to check this sig any longer
4503 sigaddset(&check_signal_done, sig);
4504 }
4506 // Print all the signal handler state
4507 if (sigismember(&check_signal_done, sig)) {
4508 print_signal_handlers(tty, buf, O_BUFLEN);
4509 }
4511 }
4513 void os::Solaris::install_signal_handlers() {
4514 bool libjsigdone = false;
4515 signal_handlers_are_installed = true;
4517 // signal-chaining
4518 typedef void (*signal_setting_t)();
4519 signal_setting_t begin_signal_setting = NULL;
4520 signal_setting_t end_signal_setting = NULL;
4521 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4522 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4523 if (begin_signal_setting != NULL) {
4524 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4525 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4526 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4527 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4528 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4529 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4530 libjsig_is_loaded = true;
4531 if (os::Solaris::get_libjsig_version != NULL) {
4532 libjsigversion = (*os::Solaris::get_libjsig_version)();
4533 }
4534 assert(UseSignalChaining, "should enable signal-chaining");
4535 }
4536 if (libjsig_is_loaded) {
4537 // Tell libjsig jvm is setting signal handlers
4538 (*begin_signal_setting)();
4539 }
4541 set_signal_handler(SIGSEGV, true, true);
4542 set_signal_handler(SIGPIPE, true, true);
4543 set_signal_handler(SIGXFSZ, true, true);
4544 set_signal_handler(SIGBUS, true, true);
4545 set_signal_handler(SIGILL, true, true);
4546 set_signal_handler(SIGFPE, true, true);
4549 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4551 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4552 // can not register overridable signals which might be > 32
4553 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4554 // Tell libjsig jvm has finished setting signal handlers
4555 (*end_signal_setting)();
4556 libjsigdone = true;
4557 }
4558 }
4560 // Never ok to chain our SIGinterrupt
4561 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4562 set_signal_handler(os::Solaris::SIGasync(), true, true);
4564 if (libjsig_is_loaded && !libjsigdone) {
4565 // Tell libjsig jvm finishes setting signal handlers
4566 (*end_signal_setting)();
4567 }
4569 // We don't activate signal checker if libjsig is in place, we trust ourselves
4570 // and if UserSignalHandler is installed all bets are off
4571 if (CheckJNICalls) {
4572 if (libjsig_is_loaded) {
4573 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4574 check_signals = false;
4575 }
4576 if (AllowUserSignalHandlers) {
4577 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4578 check_signals = false;
4579 }
4580 }
4581 }
4584 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4586 const char * signames[] = {
4587 "SIG0",
4588 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4589 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4590 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4591 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4592 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4593 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4594 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4595 "SIGCANCEL", "SIGLOST"
4596 };
4598 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4599 if (0 < exception_code && exception_code <= SIGRTMAX) {
4600 // signal
4601 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4602 jio_snprintf(buf, size, "%s", signames[exception_code]);
4603 } else {
4604 jio_snprintf(buf, size, "SIG%d", exception_code);
4605 }
4606 return buf;
4607 } else {
4608 return NULL;
4609 }
4610 }
4612 // (Static) wrappers for the new libthread API
4613 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4614 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4615 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4616 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4617 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4619 // (Static) wrapper for getisax(2) call.
4620 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4622 // (Static) wrappers for the liblgrp API
4623 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4624 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4625 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4626 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4627 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4628 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4629 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4630 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4631 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4633 // (Static) wrapper for meminfo() call.
4634 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4636 static address resolve_symbol_lazy(const char* name) {
4637 address addr = (address) dlsym(RTLD_DEFAULT, name);
4638 if(addr == NULL) {
4639 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4640 addr = (address) dlsym(RTLD_NEXT, name);
4641 }
4642 return addr;
4643 }
4645 static address resolve_symbol(const char* name) {
4646 address addr = resolve_symbol_lazy(name);
4647 if(addr == NULL) {
4648 fatal(dlerror());
4649 }
4650 return addr;
4651 }
4655 // isT2_libthread()
4656 //
4657 // Routine to determine if we are currently using the new T2 libthread.
4658 //
4659 // We determine if we are using T2 by reading /proc/self/lstatus and
4660 // looking for a thread with the ASLWP bit set. If we find this status
4661 // bit set, we must assume that we are NOT using T2. The T2 team
4662 // has approved this algorithm.
4663 //
4664 // We need to determine if we are running with the new T2 libthread
4665 // since setting native thread priorities is handled differently
4666 // when using this library. All threads created using T2 are bound
4667 // threads. Calling thr_setprio is meaningless in this case.
4668 //
4669 bool isT2_libthread() {
4670 static prheader_t * lwpArray = NULL;
4671 static int lwpSize = 0;
4672 static int lwpFile = -1;
4673 lwpstatus_t * that;
4674 char lwpName [128];
4675 bool isT2 = false;
4677 #define ADR(x) ((uintptr_t)(x))
4678 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4680 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4681 if (lwpFile < 0) {
4682 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4683 return false;
4684 }
4685 lwpSize = 16*1024;
4686 for (;;) {
4687 ::lseek64 (lwpFile, 0, SEEK_SET);
4688 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize);
4689 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4690 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4691 break;
4692 }
4693 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4694 // We got a good snapshot - now iterate over the list.
4695 int aslwpcount = 0;
4696 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4697 that = LWPINDEX(lwpArray,i);
4698 if (that->pr_flags & PR_ASLWP) {
4699 aslwpcount++;
4700 }
4701 }
4702 if (aslwpcount == 0) isT2 = true;
4703 break;
4704 }
4705 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4706 FREE_C_HEAP_ARRAY(char, lwpArray); // retry.
4707 }
4709 FREE_C_HEAP_ARRAY(char, lwpArray);
4710 ::close (lwpFile);
4711 if (ThreadPriorityVerbose) {
4712 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4713 else tty->print_cr("We are not running with a T2 libthread\n");
4714 }
4715 return isT2;
4716 }
4719 void os::Solaris::libthread_init() {
4720 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4722 // Determine if we are running with the new T2 libthread
4723 os::Solaris::set_T2_libthread(isT2_libthread());
4725 lwp_priocntl_init();
4727 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4728 if(func == NULL) {
4729 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4730 // Guarantee that this VM is running on an new enough OS (5.6 or
4731 // later) that it will have a new enough libthread.so.
4732 guarantee(func != NULL, "libthread.so is too old.");
4733 }
4735 // Initialize the new libthread getstate API wrappers
4736 func = resolve_symbol("thr_getstate");
4737 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4739 func = resolve_symbol("thr_setstate");
4740 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4742 func = resolve_symbol("thr_setmutator");
4743 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4745 func = resolve_symbol("thr_suspend_mutator");
4746 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4748 func = resolve_symbol("thr_continue_mutator");
4749 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4751 int size;
4752 void (*handler_info_func)(address *, int *);
4753 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4754 handler_info_func(&handler_start, &size);
4755 handler_end = handler_start + size;
4756 }
4759 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4760 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4761 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4762 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4763 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4764 int os::Solaris::_mutex_scope = USYNC_THREAD;
4766 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4767 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4768 int_fnP_cond_tP os::Solaris::_cond_signal;
4769 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4770 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4771 int_fnP_cond_tP os::Solaris::_cond_destroy;
4772 int os::Solaris::_cond_scope = USYNC_THREAD;
4774 void os::Solaris::synchronization_init() {
4775 if(UseLWPSynchronization) {
4776 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4777 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4778 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4779 os::Solaris::set_mutex_init(lwp_mutex_init);
4780 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4781 os::Solaris::set_mutex_scope(USYNC_THREAD);
4783 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4784 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4785 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4786 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4787 os::Solaris::set_cond_init(lwp_cond_init);
4788 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4789 os::Solaris::set_cond_scope(USYNC_THREAD);
4790 }
4791 else {
4792 os::Solaris::set_mutex_scope(USYNC_THREAD);
4793 os::Solaris::set_cond_scope(USYNC_THREAD);
4795 if(UsePthreads) {
4796 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4797 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4798 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4799 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4800 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4802 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4803 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4804 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4805 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4806 os::Solaris::set_cond_init(pthread_cond_default_init);
4807 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4808 }
4809 else {
4810 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4811 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4812 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4813 os::Solaris::set_mutex_init(::mutex_init);
4814 os::Solaris::set_mutex_destroy(::mutex_destroy);
4816 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4817 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4818 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4819 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4820 os::Solaris::set_cond_init(::cond_init);
4821 os::Solaris::set_cond_destroy(::cond_destroy);
4822 }
4823 }
4824 }
4826 bool os::Solaris::liblgrp_init() {
4827 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4828 if (handle != NULL) {
4829 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4830 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4831 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4832 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4833 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4834 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4835 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4836 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4837 dlsym(handle, "lgrp_cookie_stale")));
4839 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4840 set_lgrp_cookie(c);
4841 return true;
4842 }
4843 return false;
4844 }
4846 void os::Solaris::misc_sym_init() {
4847 address func;
4849 // getisax
4850 func = resolve_symbol_lazy("getisax");
4851 if (func != NULL) {
4852 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4853 }
4855 // meminfo
4856 func = resolve_symbol_lazy("meminfo");
4857 if (func != NULL) {
4858 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4859 }
4860 }
4862 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4863 assert(_getisax != NULL, "_getisax not set");
4864 return _getisax(array, n);
4865 }
4867 // Symbol doesn't exist in Solaris 8 pset.h
4868 #ifndef PS_MYID
4869 #define PS_MYID -3
4870 #endif
4872 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4873 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4874 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4876 void init_pset_getloadavg_ptr(void) {
4877 pset_getloadavg_ptr =
4878 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4879 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4880 warning("pset_getloadavg function not found");
4881 }
4882 }
4884 int os::Solaris::_dev_zero_fd = -1;
4886 // this is called _before_ the global arguments have been parsed
4887 void os::init(void) {
4888 _initial_pid = getpid();
4890 max_hrtime = first_hrtime = gethrtime();
4892 init_random(1234567);
4894 page_size = sysconf(_SC_PAGESIZE);
4895 if (page_size == -1)
4896 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4897 strerror(errno)));
4898 init_page_sizes((size_t) page_size);
4900 Solaris::initialize_system_info();
4902 // Initialize misc. symbols as soon as possible, so we can use them
4903 // if we need them.
4904 Solaris::misc_sym_init();
4906 int fd = ::open("/dev/zero", O_RDWR);
4907 if (fd < 0) {
4908 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4909 } else {
4910 Solaris::set_dev_zero_fd(fd);
4912 // Close on exec, child won't inherit.
4913 fcntl(fd, F_SETFD, FD_CLOEXEC);
4914 }
4916 clock_tics_per_sec = CLK_TCK;
4918 // check if dladdr1() exists; dladdr1 can provide more information than
4919 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4920 // and is available on linker patches for 5.7 and 5.8.
4921 // libdl.so must have been loaded, this call is just an entry lookup
4922 void * hdl = dlopen("libdl.so", RTLD_NOW);
4923 if (hdl)
4924 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4926 // (Solaris only) this switches to calls that actually do locking.
4927 ThreadCritical::initialize();
4929 main_thread = thr_self();
4931 // Constant minimum stack size allowed. It must be at least
4932 // the minimum of what the OS supports (thr_min_stack()), and
4933 // enough to allow the thread to get to user bytecode execution.
4934 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4935 // If the pagesize of the VM is greater than 8K determine the appropriate
4936 // number of initial guard pages. The user can change this with the
4937 // command line arguments, if needed.
4938 if (vm_page_size() > 8*K) {
4939 StackYellowPages = 1;
4940 StackRedPages = 1;
4941 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4942 }
4943 }
4945 // To install functions for atexit system call
4946 extern "C" {
4947 static void perfMemory_exit_helper() {
4948 perfMemory_exit();
4949 }
4950 }
4952 // this is called _after_ the global arguments have been parsed
4953 jint os::init_2(void) {
4954 // try to enable extended file IO ASAP, see 6431278
4955 os::Solaris::try_enable_extended_io();
4957 // Allocate a single page and mark it as readable for safepoint polling. Also
4958 // use this first mmap call to check support for MAP_ALIGN.
4959 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4960 page_size,
4961 MAP_PRIVATE | MAP_ALIGN,
4962 PROT_READ);
4963 if (polling_page == NULL) {
4964 has_map_align = false;
4965 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4966 PROT_READ);
4967 }
4969 os::set_polling_page(polling_page);
4971 #ifndef PRODUCT
4972 if( Verbose && PrintMiscellaneous )
4973 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4974 #endif
4976 if (!UseMembar) {
4977 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4978 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4979 os::set_memory_serialize_page( mem_serialize_page );
4981 #ifndef PRODUCT
4982 if(Verbose && PrintMiscellaneous)
4983 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4984 #endif
4985 }
4987 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
4989 // Check minimum allowable stack size for thread creation and to initialize
4990 // the java system classes, including StackOverflowError - depends on page
4991 // size. Add a page for compiler2 recursion in main thread.
4992 // Add in 2*BytesPerWord times page size to account for VM stack during
4993 // class initialization depending on 32 or 64 bit VM.
4994 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4995 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4996 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4998 size_t threadStackSizeInBytes = ThreadStackSize * K;
4999 if (threadStackSizeInBytes != 0 &&
5000 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5001 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5002 os::Solaris::min_stack_allowed/K);
5003 return JNI_ERR;
5004 }
5006 // For 64kbps there will be a 64kb page size, which makes
5007 // the usable default stack size quite a bit less. Increase the
5008 // stack for 64kb (or any > than 8kb) pages, this increases
5009 // virtual memory fragmentation (since we're not creating the
5010 // stack on a power of 2 boundary. The real fix for this
5011 // should be to fix the guard page mechanism.
5013 if (vm_page_size() > 8*K) {
5014 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5015 ? threadStackSizeInBytes +
5016 ((StackYellowPages + StackRedPages) * vm_page_size())
5017 : 0;
5018 ThreadStackSize = threadStackSizeInBytes/K;
5019 }
5021 // Make the stack size a multiple of the page size so that
5022 // the yellow/red zones can be guarded.
5023 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5024 vm_page_size()));
5026 Solaris::libthread_init();
5028 if (UseNUMA) {
5029 if (!Solaris::liblgrp_init()) {
5030 UseNUMA = false;
5031 } else {
5032 size_t lgrp_limit = os::numa_get_groups_num();
5033 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit);
5034 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5035 FREE_C_HEAP_ARRAY(int, lgrp_ids);
5036 if (lgrp_num < 2) {
5037 // There's only one locality group, disable NUMA.
5038 UseNUMA = false;
5039 }
5040 }
5041 if (!UseNUMA && ForceNUMA) {
5042 UseNUMA = true;
5043 }
5044 }
5046 Solaris::signal_sets_init();
5047 Solaris::init_signal_mem();
5048 Solaris::install_signal_handlers();
5050 if (libjsigversion < JSIG_VERSION_1_4_1) {
5051 Maxlibjsigsigs = OLDMAXSIGNUM;
5052 }
5054 // initialize synchronization primitives to use either thread or
5055 // lwp synchronization (controlled by UseLWPSynchronization)
5056 Solaris::synchronization_init();
5058 if (MaxFDLimit) {
5059 // set the number of file descriptors to max. print out error
5060 // if getrlimit/setrlimit fails but continue regardless.
5061 struct rlimit nbr_files;
5062 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5063 if (status != 0) {
5064 if (PrintMiscellaneous && (Verbose || WizardMode))
5065 perror("os::init_2 getrlimit failed");
5066 } else {
5067 nbr_files.rlim_cur = nbr_files.rlim_max;
5068 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5069 if (status != 0) {
5070 if (PrintMiscellaneous && (Verbose || WizardMode))
5071 perror("os::init_2 setrlimit failed");
5072 }
5073 }
5074 }
5076 // Calculate theoretical max. size of Threads to guard gainst
5077 // artifical out-of-memory situations, where all available address-
5078 // space has been reserved by thread stacks. Default stack size is 1Mb.
5079 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5080 JavaThread::stack_size_at_create() : (1*K*K);
5081 assert(pre_thread_stack_size != 0, "Must have a stack");
5082 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5083 // we should start doing Virtual Memory banging. Currently when the threads will
5084 // have used all but 200Mb of space.
5085 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5086 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5088 // at-exit methods are called in the reverse order of their registration.
5089 // In Solaris 7 and earlier, atexit functions are called on return from
5090 // main or as a result of a call to exit(3C). There can be only 32 of
5091 // these functions registered and atexit() does not set errno. In Solaris
5092 // 8 and later, there is no limit to the number of functions registered
5093 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5094 // functions are called upon dlclose(3DL) in addition to return from main
5095 // and exit(3C).
5097 if (PerfAllowAtExitRegistration) {
5098 // only register atexit functions if PerfAllowAtExitRegistration is set.
5099 // atexit functions can be delayed until process exit time, which
5100 // can be problematic for embedded VM situations. Embedded VMs should
5101 // call DestroyJavaVM() to assure that VM resources are released.
5103 // note: perfMemory_exit_helper atexit function may be removed in
5104 // the future if the appropriate cleanup code can be added to the
5105 // VM_Exit VMOperation's doit method.
5106 if (atexit(perfMemory_exit_helper) != 0) {
5107 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5108 }
5109 }
5111 // Init pset_loadavg function pointer
5112 init_pset_getloadavg_ptr();
5114 return JNI_OK;
5115 }
5117 void os::init_3(void) {
5118 return;
5119 }
5121 // Mark the polling page as unreadable
5122 void os::make_polling_page_unreadable(void) {
5123 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5124 fatal("Could not disable polling page");
5125 };
5127 // Mark the polling page as readable
5128 void os::make_polling_page_readable(void) {
5129 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5130 fatal("Could not enable polling page");
5131 };
5133 // OS interface.
5135 bool os::check_heap(bool force) { return true; }
5137 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5138 static vsnprintf_t sol_vsnprintf = NULL;
5140 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5141 if (!sol_vsnprintf) {
5142 //search for the named symbol in the objects that were loaded after libjvm
5143 void* where = RTLD_NEXT;
5144 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5145 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5146 if (!sol_vsnprintf){
5147 //search for the named symbol in the objects that were loaded before libjvm
5148 where = RTLD_DEFAULT;
5149 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5150 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5151 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5152 }
5153 }
5154 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5155 }
5158 // Is a (classpath) directory empty?
5159 bool os::dir_is_empty(const char* path) {
5160 DIR *dir = NULL;
5161 struct dirent *ptr;
5163 dir = opendir(path);
5164 if (dir == NULL) return true;
5166 /* Scan the directory */
5167 bool result = true;
5168 char buf[sizeof(struct dirent) + MAX_PATH];
5169 struct dirent *dbuf = (struct dirent *) buf;
5170 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5171 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5172 result = false;
5173 }
5174 }
5175 closedir(dir);
5176 return result;
5177 }
5179 // This code originates from JDK's sysOpen and open64_w
5180 // from src/solaris/hpi/src/system_md.c
5182 #ifndef O_DELETE
5183 #define O_DELETE 0x10000
5184 #endif
5186 // Open a file. Unlink the file immediately after open returns
5187 // if the specified oflag has the O_DELETE flag set.
5188 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5190 int os::open(const char *path, int oflag, int mode) {
5191 if (strlen(path) > MAX_PATH - 1) {
5192 errno = ENAMETOOLONG;
5193 return -1;
5194 }
5195 int fd;
5196 int o_delete = (oflag & O_DELETE);
5197 oflag = oflag & ~O_DELETE;
5199 fd = ::open64(path, oflag, mode);
5200 if (fd == -1) return -1;
5202 //If the open succeeded, the file might still be a directory
5203 {
5204 struct stat64 buf64;
5205 int ret = ::fstat64(fd, &buf64);
5206 int st_mode = buf64.st_mode;
5208 if (ret != -1) {
5209 if ((st_mode & S_IFMT) == S_IFDIR) {
5210 errno = EISDIR;
5211 ::close(fd);
5212 return -1;
5213 }
5214 } else {
5215 ::close(fd);
5216 return -1;
5217 }
5218 }
5219 /*
5220 * 32-bit Solaris systems suffer from:
5221 *
5222 * - an historical default soft limit of 256 per-process file
5223 * descriptors that is too low for many Java programs.
5224 *
5225 * - a design flaw where file descriptors created using stdio
5226 * fopen must be less than 256, _even_ when the first limit above
5227 * has been raised. This can cause calls to fopen (but not calls to
5228 * open, for example) to fail mysteriously, perhaps in 3rd party
5229 * native code (although the JDK itself uses fopen). One can hardly
5230 * criticize them for using this most standard of all functions.
5231 *
5232 * We attempt to make everything work anyways by:
5233 *
5234 * - raising the soft limit on per-process file descriptors beyond
5235 * 256
5236 *
5237 * - As of Solaris 10u4, we can request that Solaris raise the 256
5238 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5239 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5240 *
5241 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5242 * workaround the bug by remapping non-stdio file descriptors below
5243 * 256 to ones beyond 256, which is done below.
5244 *
5245 * See:
5246 * 1085341: 32-bit stdio routines should support file descriptors >255
5247 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5248 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5249 * enable_extended_FILE_stdio() in VM initialisation
5250 * Giri Mandalika's blog
5251 * http://technopark02.blogspot.com/2005_05_01_archive.html
5252 */
5253 #ifndef _LP64
5254 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5255 int newfd = ::fcntl(fd, F_DUPFD, 256);
5256 if (newfd != -1) {
5257 ::close(fd);
5258 fd = newfd;
5259 }
5260 }
5261 #endif // 32-bit Solaris
5262 /*
5263 * All file descriptors that are opened in the JVM and not
5264 * specifically destined for a subprocess should have the
5265 * close-on-exec flag set. If we don't set it, then careless 3rd
5266 * party native code might fork and exec without closing all
5267 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5268 * UNIXProcess.c), and this in turn might:
5269 *
5270 * - cause end-of-file to fail to be detected on some file
5271 * descriptors, resulting in mysterious hangs, or
5272 *
5273 * - might cause an fopen in the subprocess to fail on a system
5274 * suffering from bug 1085341.
5275 *
5276 * (Yes, the default setting of the close-on-exec flag is a Unix
5277 * design flaw)
5278 *
5279 * See:
5280 * 1085341: 32-bit stdio routines should support file descriptors >255
5281 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5282 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5283 */
5284 #ifdef FD_CLOEXEC
5285 {
5286 int flags = ::fcntl(fd, F_GETFD);
5287 if (flags != -1)
5288 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5289 }
5290 #endif
5292 if (o_delete != 0) {
5293 ::unlink(path);
5294 }
5295 return fd;
5296 }
5298 // create binary file, rewriting existing file if required
5299 int os::create_binary_file(const char* path, bool rewrite_existing) {
5300 int oflags = O_WRONLY | O_CREAT;
5301 if (!rewrite_existing) {
5302 oflags |= O_EXCL;
5303 }
5304 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5305 }
5307 // return current position of file pointer
5308 jlong os::current_file_offset(int fd) {
5309 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5310 }
5312 // move file pointer to the specified offset
5313 jlong os::seek_to_file_offset(int fd, jlong offset) {
5314 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5315 }
5317 jlong os::lseek(int fd, jlong offset, int whence) {
5318 return (jlong) ::lseek64(fd, offset, whence);
5319 }
5321 char * os::native_path(char *path) {
5322 return path;
5323 }
5325 int os::ftruncate(int fd, jlong length) {
5326 return ::ftruncate64(fd, length);
5327 }
5329 int os::fsync(int fd) {
5330 RESTARTABLE_RETURN_INT(::fsync(fd));
5331 }
5333 int os::available(int fd, jlong *bytes) {
5334 jlong cur, end;
5335 int mode;
5336 struct stat64 buf64;
5338 if (::fstat64(fd, &buf64) >= 0) {
5339 mode = buf64.st_mode;
5340 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5341 /*
5342 * XXX: is the following call interruptible? If so, this might
5343 * need to go through the INTERRUPT_IO() wrapper as for other
5344 * blocking, interruptible calls in this file.
5345 */
5346 int n,ioctl_return;
5348 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5349 if (ioctl_return>= 0) {
5350 *bytes = n;
5351 return 1;
5352 }
5353 }
5354 }
5355 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5356 return 0;
5357 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5358 return 0;
5359 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5360 return 0;
5361 }
5362 *bytes = end - cur;
5363 return 1;
5364 }
5366 // Map a block of memory.
5367 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
5368 char *addr, size_t bytes, bool read_only,
5369 bool allow_exec) {
5370 int prot;
5371 int flags;
5373 if (read_only) {
5374 prot = PROT_READ;
5375 flags = MAP_SHARED;
5376 } else {
5377 prot = PROT_READ | PROT_WRITE;
5378 flags = MAP_PRIVATE;
5379 }
5381 if (allow_exec) {
5382 prot |= PROT_EXEC;
5383 }
5385 if (addr != NULL) {
5386 flags |= MAP_FIXED;
5387 }
5389 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5390 fd, file_offset);
5391 if (mapped_address == MAP_FAILED) {
5392 return NULL;
5393 }
5394 return mapped_address;
5395 }
5398 // Remap a block of memory.
5399 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
5400 char *addr, size_t bytes, bool read_only,
5401 bool allow_exec) {
5402 // same as map_memory() on this OS
5403 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5404 allow_exec);
5405 }
5408 // Unmap a block of memory.
5409 bool os::unmap_memory(char* addr, size_t bytes) {
5410 return munmap(addr, bytes) == 0;
5411 }
5413 void os::pause() {
5414 char filename[MAX_PATH];
5415 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5416 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5417 } else {
5418 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5419 }
5421 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5422 if (fd != -1) {
5423 struct stat buf;
5424 ::close(fd);
5425 while (::stat(filename, &buf) == 0) {
5426 (void)::poll(NULL, 0, 100);
5427 }
5428 } else {
5429 jio_fprintf(stderr,
5430 "Could not open pause file '%s', continuing immediately.\n", filename);
5431 }
5432 }
5434 #ifndef PRODUCT
5435 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5436 // Turn this on if you need to trace synch operations.
5437 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5438 // and call record_synch_enable and record_synch_disable
5439 // around the computation of interest.
5441 void record_synch(char* name, bool returning); // defined below
5443 class RecordSynch {
5444 char* _name;
5445 public:
5446 RecordSynch(char* name) :_name(name)
5447 { record_synch(_name, false); }
5448 ~RecordSynch() { record_synch(_name, true); }
5449 };
5451 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5452 extern "C" ret name params { \
5453 typedef ret name##_t params; \
5454 static name##_t* implem = NULL; \
5455 static int callcount = 0; \
5456 if (implem == NULL) { \
5457 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5458 if (implem == NULL) fatal(dlerror()); \
5459 } \
5460 ++callcount; \
5461 RecordSynch _rs(#name); \
5462 inner; \
5463 return implem args; \
5464 }
5465 // in dbx, examine callcounts this way:
5466 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5468 #define CHECK_POINTER_OK(p) \
5469 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p)))
5470 #define CHECK_MU \
5471 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5472 #define CHECK_CV \
5473 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5474 #define CHECK_P(p) \
5475 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5477 #define CHECK_MUTEX(mutex_op) \
5478 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5480 CHECK_MUTEX( mutex_lock)
5481 CHECK_MUTEX( _mutex_lock)
5482 CHECK_MUTEX( mutex_unlock)
5483 CHECK_MUTEX(_mutex_unlock)
5484 CHECK_MUTEX( mutex_trylock)
5485 CHECK_MUTEX(_mutex_trylock)
5487 #define CHECK_COND(cond_op) \
5488 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5490 CHECK_COND( cond_wait);
5491 CHECK_COND(_cond_wait);
5492 CHECK_COND(_cond_wait_cancel);
5494 #define CHECK_COND2(cond_op) \
5495 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5497 CHECK_COND2( cond_timedwait);
5498 CHECK_COND2(_cond_timedwait);
5499 CHECK_COND2(_cond_timedwait_cancel);
5501 // do the _lwp_* versions too
5502 #define mutex_t lwp_mutex_t
5503 #define cond_t lwp_cond_t
5504 CHECK_MUTEX( _lwp_mutex_lock)
5505 CHECK_MUTEX( _lwp_mutex_unlock)
5506 CHECK_MUTEX( _lwp_mutex_trylock)
5507 CHECK_MUTEX( __lwp_mutex_lock)
5508 CHECK_MUTEX( __lwp_mutex_unlock)
5509 CHECK_MUTEX( __lwp_mutex_trylock)
5510 CHECK_MUTEX(___lwp_mutex_lock)
5511 CHECK_MUTEX(___lwp_mutex_unlock)
5513 CHECK_COND( _lwp_cond_wait);
5514 CHECK_COND( __lwp_cond_wait);
5515 CHECK_COND(___lwp_cond_wait);
5517 CHECK_COND2( _lwp_cond_timedwait);
5518 CHECK_COND2( __lwp_cond_timedwait);
5519 #undef mutex_t
5520 #undef cond_t
5522 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5523 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5524 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5525 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5526 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5527 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5528 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5529 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5532 // recording machinery:
5534 enum { RECORD_SYNCH_LIMIT = 200 };
5535 char* record_synch_name[RECORD_SYNCH_LIMIT];
5536 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5537 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5538 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5539 int record_synch_count = 0;
5540 bool record_synch_enabled = false;
5542 // in dbx, examine recorded data this way:
5543 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5545 void record_synch(char* name, bool returning) {
5546 if (record_synch_enabled) {
5547 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5548 record_synch_name[record_synch_count] = name;
5549 record_synch_returning[record_synch_count] = returning;
5550 record_synch_thread[record_synch_count] = thr_self();
5551 record_synch_arg0ptr[record_synch_count] = &name;
5552 record_synch_count++;
5553 }
5554 // put more checking code here:
5555 // ...
5556 }
5557 }
5559 void record_synch_enable() {
5560 // start collecting trace data, if not already doing so
5561 if (!record_synch_enabled) record_synch_count = 0;
5562 record_synch_enabled = true;
5563 }
5565 void record_synch_disable() {
5566 // stop collecting trace data
5567 record_synch_enabled = false;
5568 }
5570 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5571 #endif // PRODUCT
5573 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5574 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5575 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5578 // JVMTI & JVM monitoring and management support
5579 // The thread_cpu_time() and current_thread_cpu_time() are only
5580 // supported if is_thread_cpu_time_supported() returns true.
5581 // They are not supported on Solaris T1.
5583 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5584 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5585 // of a thread.
5586 //
5587 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5588 // returns the fast estimate available on the platform.
5590 // hrtime_t gethrvtime() return value includes
5591 // user time but does not include system time
5592 jlong os::current_thread_cpu_time() {
5593 return (jlong) gethrvtime();
5594 }
5596 jlong os::thread_cpu_time(Thread *thread) {
5597 // return user level CPU time only to be consistent with
5598 // what current_thread_cpu_time returns.
5599 // thread_cpu_time_info() must be changed if this changes
5600 return os::thread_cpu_time(thread, false /* user time only */);
5601 }
5603 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5604 if (user_sys_cpu_time) {
5605 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5606 } else {
5607 return os::current_thread_cpu_time();
5608 }
5609 }
5611 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5612 char proc_name[64];
5613 int count;
5614 prusage_t prusage;
5615 jlong lwp_time;
5616 int fd;
5618 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5619 getpid(),
5620 thread->osthread()->lwp_id());
5621 fd = ::open(proc_name, O_RDONLY);
5622 if ( fd == -1 ) return -1;
5624 do {
5625 count = ::pread(fd,
5626 (void *)&prusage.pr_utime,
5627 thr_time_size,
5628 thr_time_off);
5629 } while (count < 0 && errno == EINTR);
5630 ::close(fd);
5631 if ( count < 0 ) return -1;
5633 if (user_sys_cpu_time) {
5634 // user + system CPU time
5635 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5636 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5637 (jlong)prusage.pr_stime.tv_nsec +
5638 (jlong)prusage.pr_utime.tv_nsec;
5639 } else {
5640 // user level CPU time only
5641 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5642 (jlong)prusage.pr_utime.tv_nsec;
5643 }
5645 return(lwp_time);
5646 }
5648 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5649 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5650 info_ptr->may_skip_backward = false; // elapsed time not wall time
5651 info_ptr->may_skip_forward = false; // elapsed time not wall time
5652 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5653 }
5655 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5656 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5657 info_ptr->may_skip_backward = false; // elapsed time not wall time
5658 info_ptr->may_skip_forward = false; // elapsed time not wall time
5659 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5660 }
5662 bool os::is_thread_cpu_time_supported() {
5663 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5664 return true;
5665 } else {
5666 return false;
5667 }
5668 }
5670 // System loadavg support. Returns -1 if load average cannot be obtained.
5671 // Return the load average for our processor set if the primitive exists
5672 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5673 int os::loadavg(double loadavg[], int nelem) {
5674 if (pset_getloadavg_ptr != NULL) {
5675 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5676 } else {
5677 return ::getloadavg(loadavg, nelem);
5678 }
5679 }
5681 //---------------------------------------------------------------------------------
5683 static address same_page(address x, address y) {
5684 intptr_t page_bits = -os::vm_page_size();
5685 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
5686 return x;
5687 else if (x > y)
5688 return (address)(intptr_t(y) | ~page_bits) + 1;
5689 else
5690 return (address)(intptr_t(y) & page_bits);
5691 }
5693 bool os::find(address addr, outputStream* st) {
5694 Dl_info dlinfo;
5695 memset(&dlinfo, 0, sizeof(dlinfo));
5696 if (dladdr(addr, &dlinfo)) {
5697 #ifdef _LP64
5698 st->print("0x%016lx: ", addr);
5699 #else
5700 st->print("0x%08x: ", addr);
5701 #endif
5702 if (dlinfo.dli_sname != NULL)
5703 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5704 else if (dlinfo.dli_fname)
5705 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5706 else
5707 st->print("<absolute address>");
5708 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname);
5709 #ifdef _LP64
5710 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase);
5711 #else
5712 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase);
5713 #endif
5714 st->cr();
5716 if (Verbose) {
5717 // decode some bytes around the PC
5718 address begin = same_page(addr-40, addr);
5719 address end = same_page(addr+40, addr);
5720 address lowest = (address) dlinfo.dli_sname;
5721 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5722 if (begin < lowest) begin = lowest;
5723 Dl_info dlinfo2;
5724 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5725 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5726 end = (address) dlinfo2.dli_saddr;
5727 Disassembler::decode(begin, end, st);
5728 }
5729 return true;
5730 }
5731 return false;
5732 }
5734 // Following function has been added to support HotSparc's libjvm.so running
5735 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5736 // src/solaris/hpi/native_threads in the EVM codebase.
5737 //
5738 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5739 // libraries and should thus be removed. We will leave it behind for a while
5740 // until we no longer want to able to run on top of 1.3.0 Solaris production
5741 // JDK. See 4341971.
5743 #define STACK_SLACK 0x800
5745 extern "C" {
5746 intptr_t sysThreadAvailableStackWithSlack() {
5747 stack_t st;
5748 intptr_t retval, stack_top;
5749 retval = thr_stksegment(&st);
5750 assert(retval == 0, "incorrect return value from thr_stksegment");
5751 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5752 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5753 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5754 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5755 }
5756 }
5758 // Just to get the Kernel build to link on solaris for testing.
5760 extern "C" {
5761 class ASGCT_CallTrace;
5762 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext)
5763 KERNEL_RETURN;
5764 }
5767 // ObjectMonitor park-unpark infrastructure ...
5768 //
5769 // We implement Solaris and Linux PlatformEvents with the
5770 // obvious condvar-mutex-flag triple.
5771 // Another alternative that works quite well is pipes:
5772 // Each PlatformEvent consists of a pipe-pair.
5773 // The thread associated with the PlatformEvent
5774 // calls park(), which reads from the input end of the pipe.
5775 // Unpark() writes into the other end of the pipe.
5776 // The write-side of the pipe must be set NDELAY.
5777 // Unfortunately pipes consume a large # of handles.
5778 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5779 // Using pipes for the 1st few threads might be workable, however.
5780 //
5781 // park() is permitted to return spuriously.
5782 // Callers of park() should wrap the call to park() in
5783 // an appropriate loop. A litmus test for the correct
5784 // usage of park is the following: if park() were modified
5785 // to immediately return 0 your code should still work,
5786 // albeit degenerating to a spin loop.
5787 //
5788 // An interesting optimization for park() is to use a trylock()
5789 // to attempt to acquire the mutex. If the trylock() fails
5790 // then we know that a concurrent unpark() operation is in-progress.
5791 // in that case the park() code could simply set _count to 0
5792 // and return immediately. The subsequent park() operation *might*
5793 // return immediately. That's harmless as the caller of park() is
5794 // expected to loop. By using trylock() we will have avoided a
5795 // avoided a context switch caused by contention on the per-thread mutex.
5796 //
5797 // TODO-FIXME:
5798 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5799 // objectmonitor implementation.
5800 // 2. Collapse the JSR166 parker event, and the
5801 // objectmonitor ParkEvent into a single "Event" construct.
5802 // 3. In park() and unpark() add:
5803 // assert (Thread::current() == AssociatedWith).
5804 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5805 // 1-out-of-N park() operations will return immediately.
5806 //
5807 // _Event transitions in park()
5808 // -1 => -1 : illegal
5809 // 1 => 0 : pass - return immediately
5810 // 0 => -1 : block
5811 //
5812 // _Event serves as a restricted-range semaphore.
5813 //
5814 // Another possible encoding of _Event would be with
5815 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5816 //
5817 // TODO-FIXME: add DTRACE probes for:
5818 // 1. Tx parks
5819 // 2. Ty unparks Tx
5820 // 3. Tx resumes from park
5823 // value determined through experimentation
5824 #define ROUNDINGFIX 11
5826 // utility to compute the abstime argument to timedwait.
5827 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5829 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5830 // millis is the relative timeout time
5831 // abstime will be the absolute timeout time
5832 if (millis < 0) millis = 0;
5833 struct timeval now;
5834 int status = gettimeofday(&now, NULL);
5835 assert(status == 0, "gettimeofday");
5836 jlong seconds = millis / 1000;
5837 jlong max_wait_period;
5839 if (UseLWPSynchronization) {
5840 // forward port of fix for 4275818 (not sleeping long enough)
5841 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5842 // _lwp_cond_timedwait() used a round_down algorithm rather
5843 // than a round_up. For millis less than our roundfactor
5844 // it rounded down to 0 which doesn't meet the spec.
5845 // For millis > roundfactor we may return a bit sooner, but
5846 // since we can not accurately identify the patch level and
5847 // this has already been fixed in Solaris 9 and 8 we will
5848 // leave it alone rather than always rounding down.
5850 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5851 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5852 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5853 max_wait_period = 21000000;
5854 } else {
5855 max_wait_period = 50000000;
5856 }
5857 millis %= 1000;
5858 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5859 seconds = max_wait_period;
5860 }
5861 abstime->tv_sec = now.tv_sec + seconds;
5862 long usec = now.tv_usec + millis * 1000;
5863 if (usec >= 1000000) {
5864 abstime->tv_sec += 1;
5865 usec -= 1000000;
5866 }
5867 abstime->tv_nsec = usec * 1000;
5868 return abstime;
5869 }
5871 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5872 // Conceptually TryPark() should be equivalent to park(0).
5874 int os::PlatformEvent::TryPark() {
5875 for (;;) {
5876 const int v = _Event ;
5877 guarantee ((v == 0) || (v == 1), "invariant") ;
5878 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5879 }
5880 }
5882 void os::PlatformEvent::park() { // AKA: down()
5883 // Invariant: Only the thread associated with the Event/PlatformEvent
5884 // may call park().
5885 int v ;
5886 for (;;) {
5887 v = _Event ;
5888 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5889 }
5890 guarantee (v >= 0, "invariant") ;
5891 if (v == 0) {
5892 // Do this the hard way by blocking ...
5893 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5894 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5895 // Only for SPARC >= V8PlusA
5896 #if defined(__sparc) && defined(COMPILER2)
5897 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5898 #endif
5899 int status = os::Solaris::mutex_lock(_mutex);
5900 assert_status(status == 0, status, "mutex_lock");
5901 guarantee (_nParked == 0, "invariant") ;
5902 ++ _nParked ;
5903 while (_Event < 0) {
5904 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5905 // Treat this the same as if the wait was interrupted
5906 // With usr/lib/lwp going to kernel, always handle ETIME
5907 status = os::Solaris::cond_wait(_cond, _mutex);
5908 if (status == ETIME) status = EINTR ;
5909 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5910 }
5911 -- _nParked ;
5912 _Event = 0 ;
5913 status = os::Solaris::mutex_unlock(_mutex);
5914 assert_status(status == 0, status, "mutex_unlock");
5915 }
5916 }
5918 int os::PlatformEvent::park(jlong millis) {
5919 guarantee (_nParked == 0, "invariant") ;
5920 int v ;
5921 for (;;) {
5922 v = _Event ;
5923 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5924 }
5925 guarantee (v >= 0, "invariant") ;
5926 if (v != 0) return OS_OK ;
5928 int ret = OS_TIMEOUT;
5929 timestruc_t abst;
5930 compute_abstime (&abst, millis);
5932 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5933 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5934 // Only for SPARC >= V8PlusA
5935 #if defined(__sparc) && defined(COMPILER2)
5936 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5937 #endif
5938 int status = os::Solaris::mutex_lock(_mutex);
5939 assert_status(status == 0, status, "mutex_lock");
5940 guarantee (_nParked == 0, "invariant") ;
5941 ++ _nParked ;
5942 while (_Event < 0) {
5943 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5944 assert_status(status == 0 || status == EINTR ||
5945 status == ETIME || status == ETIMEDOUT,
5946 status, "cond_timedwait");
5947 if (!FilterSpuriousWakeups) break ; // previous semantics
5948 if (status == ETIME || status == ETIMEDOUT) break ;
5949 // We consume and ignore EINTR and spurious wakeups.
5950 }
5951 -- _nParked ;
5952 if (_Event >= 0) ret = OS_OK ;
5953 _Event = 0 ;
5954 status = os::Solaris::mutex_unlock(_mutex);
5955 assert_status(status == 0, status, "mutex_unlock");
5956 return ret;
5957 }
5959 void os::PlatformEvent::unpark() {
5960 int v, AnyWaiters;
5962 // Increment _Event.
5963 // Another acceptable implementation would be to simply swap 1
5964 // into _Event:
5965 // if (Swap (&_Event, 1) < 0) {
5966 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ;
5967 // if (AnyWaiters) cond_signal (_cond) ;
5968 // }
5970 for (;;) {
5971 v = _Event ;
5972 if (v > 0) {
5973 // The LD of _Event could have reordered or be satisfied
5974 // by a read-aside from this processor's write buffer.
5975 // To avoid problems execute a barrier and then
5976 // ratify the value. A degenerate CAS() would also work.
5977 // Viz., CAS (v+0, &_Event, v) == v).
5978 OrderAccess::fence() ;
5979 if (_Event == v) return ;
5980 continue ;
5981 }
5982 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
5983 }
5985 // If the thread associated with the event was parked, wake it.
5986 if (v < 0) {
5987 int status ;
5988 // Wait for the thread assoc with the PlatformEvent to vacate.
5989 status = os::Solaris::mutex_lock(_mutex);
5990 assert_status(status == 0, status, "mutex_lock");
5991 AnyWaiters = _nParked ;
5992 status = os::Solaris::mutex_unlock(_mutex);
5993 assert_status(status == 0, status, "mutex_unlock");
5994 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
5995 if (AnyWaiters != 0) {
5996 // We intentional signal *after* dropping the lock
5997 // to avoid a common class of futile wakeups.
5998 status = os::Solaris::cond_signal(_cond);
5999 assert_status(status == 0, status, "cond_signal");
6000 }
6001 }
6002 }
6004 // JSR166
6005 // -------------------------------------------------------
6007 /*
6008 * The solaris and linux implementations of park/unpark are fairly
6009 * conservative for now, but can be improved. They currently use a
6010 * mutex/condvar pair, plus _counter.
6011 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6012 * sets count to 1 and signals condvar. Only one thread ever waits
6013 * on the condvar. Contention seen when trying to park implies that someone
6014 * is unparking you, so don't wait. And spurious returns are fine, so there
6015 * is no need to track notifications.
6016 */
6018 #define NANOSECS_PER_SEC 1000000000
6019 #define NANOSECS_PER_MILLISEC 1000000
6020 #define MAX_SECS 100000000
6022 /*
6023 * This code is common to linux and solaris and will be moved to a
6024 * common place in dolphin.
6025 *
6026 * The passed in time value is either a relative time in nanoseconds
6027 * or an absolute time in milliseconds. Either way it has to be unpacked
6028 * into suitable seconds and nanoseconds components and stored in the
6029 * given timespec structure.
6030 * Given time is a 64-bit value and the time_t used in the timespec is only
6031 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6032 * overflow if times way in the future are given. Further on Solaris versions
6033 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6034 * number of seconds, in abstime, is less than current_time + 100,000,000.
6035 * As it will be 28 years before "now + 100000000" will overflow we can
6036 * ignore overflow and just impose a hard-limit on seconds using the value
6037 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6038 * years from "now".
6039 */
6040 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6041 assert (time > 0, "convertTime");
6043 struct timeval now;
6044 int status = gettimeofday(&now, NULL);
6045 assert(status == 0, "gettimeofday");
6047 time_t max_secs = now.tv_sec + MAX_SECS;
6049 if (isAbsolute) {
6050 jlong secs = time / 1000;
6051 if (secs > max_secs) {
6052 absTime->tv_sec = max_secs;
6053 }
6054 else {
6055 absTime->tv_sec = secs;
6056 }
6057 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6058 }
6059 else {
6060 jlong secs = time / NANOSECS_PER_SEC;
6061 if (secs >= MAX_SECS) {
6062 absTime->tv_sec = max_secs;
6063 absTime->tv_nsec = 0;
6064 }
6065 else {
6066 absTime->tv_sec = now.tv_sec + secs;
6067 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6068 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6069 absTime->tv_nsec -= NANOSECS_PER_SEC;
6070 ++absTime->tv_sec; // note: this must be <= max_secs
6071 }
6072 }
6073 }
6074 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6075 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6076 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6077 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6078 }
6080 void Parker::park(bool isAbsolute, jlong time) {
6082 // Optional fast-path check:
6083 // Return immediately if a permit is available.
6084 if (_counter > 0) {
6085 _counter = 0 ;
6086 OrderAccess::fence();
6087 return ;
6088 }
6090 // Optional fast-exit: Check interrupt before trying to wait
6091 Thread* thread = Thread::current();
6092 assert(thread->is_Java_thread(), "Must be JavaThread");
6093 JavaThread *jt = (JavaThread *)thread;
6094 if (Thread::is_interrupted(thread, false)) {
6095 return;
6096 }
6098 // First, demultiplex/decode time arguments
6099 timespec absTime;
6100 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6101 return;
6102 }
6103 if (time > 0) {
6104 // Warning: this code might be exposed to the old Solaris time
6105 // round-down bugs. Grep "roundingFix" for details.
6106 unpackTime(&absTime, isAbsolute, time);
6107 }
6109 // Enter safepoint region
6110 // Beware of deadlocks such as 6317397.
6111 // The per-thread Parker:: _mutex is a classic leaf-lock.
6112 // In particular a thread must never block on the Threads_lock while
6113 // holding the Parker:: mutex. If safepoints are pending both the
6114 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6115 ThreadBlockInVM tbivm(jt);
6117 // Don't wait if cannot get lock since interference arises from
6118 // unblocking. Also. check interrupt before trying wait
6119 if (Thread::is_interrupted(thread, false) ||
6120 os::Solaris::mutex_trylock(_mutex) != 0) {
6121 return;
6122 }
6124 int status ;
6126 if (_counter > 0) { // no wait needed
6127 _counter = 0;
6128 status = os::Solaris::mutex_unlock(_mutex);
6129 assert (status == 0, "invariant") ;
6130 OrderAccess::fence();
6131 return;
6132 }
6134 #ifdef ASSERT
6135 // Don't catch signals while blocked; let the running threads have the signals.
6136 // (This allows a debugger to break into the running thread.)
6137 sigset_t oldsigs;
6138 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6139 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6140 #endif
6142 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6143 jt->set_suspend_equivalent();
6144 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6146 // Do this the hard way by blocking ...
6147 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6148 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6149 // Only for SPARC >= V8PlusA
6150 #if defined(__sparc) && defined(COMPILER2)
6151 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6152 #endif
6154 if (time == 0) {
6155 status = os::Solaris::cond_wait (_cond, _mutex) ;
6156 } else {
6157 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6158 }
6159 // Note that an untimed cond_wait() can sometimes return ETIME on older
6160 // versions of the Solaris.
6161 assert_status(status == 0 || status == EINTR ||
6162 status == ETIME || status == ETIMEDOUT,
6163 status, "cond_timedwait");
6165 #ifdef ASSERT
6166 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6167 #endif
6168 _counter = 0 ;
6169 status = os::Solaris::mutex_unlock(_mutex);
6170 assert_status(status == 0, status, "mutex_unlock") ;
6172 // If externally suspended while waiting, re-suspend
6173 if (jt->handle_special_suspend_equivalent_condition()) {
6174 jt->java_suspend_self();
6175 }
6176 OrderAccess::fence();
6177 }
6179 void Parker::unpark() {
6180 int s, status ;
6181 status = os::Solaris::mutex_lock (_mutex) ;
6182 assert (status == 0, "invariant") ;
6183 s = _counter;
6184 _counter = 1;
6185 status = os::Solaris::mutex_unlock (_mutex) ;
6186 assert (status == 0, "invariant") ;
6188 if (s < 1) {
6189 status = os::Solaris::cond_signal (_cond) ;
6190 assert (status == 0, "invariant") ;
6191 }
6192 }
6194 extern char** environ;
6196 // Run the specified command in a separate process. Return its exit value,
6197 // or -1 on failure (e.g. can't fork a new process).
6198 // Unlike system(), this function can be called from signal handler. It
6199 // doesn't block SIGINT et al.
6200 int os::fork_and_exec(char* cmd) {
6201 char * argv[4];
6202 argv[0] = (char *)"sh";
6203 argv[1] = (char *)"-c";
6204 argv[2] = cmd;
6205 argv[3] = NULL;
6207 // fork is async-safe, fork1 is not so can't use in signal handler
6208 pid_t pid;
6209 Thread* t = ThreadLocalStorage::get_thread_slow();
6210 if (t != NULL && t->is_inside_signal_handler()) {
6211 pid = fork();
6212 } else {
6213 pid = fork1();
6214 }
6216 if (pid < 0) {
6217 // fork failed
6218 warning("fork failed: %s", strerror(errno));
6219 return -1;
6221 } else if (pid == 0) {
6222 // child process
6224 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6225 execve("/usr/bin/sh", argv, environ);
6227 // execve failed
6228 _exit(-1);
6230 } else {
6231 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6232 // care about the actual exit code, for now.
6234 int status;
6236 // Wait for the child process to exit. This returns immediately if
6237 // the child has already exited. */
6238 while (waitpid(pid, &status, 0) < 0) {
6239 switch (errno) {
6240 case ECHILD: return 0;
6241 case EINTR: break;
6242 default: return -1;
6243 }
6244 }
6246 if (WIFEXITED(status)) {
6247 // The child exited normally; get its exit code.
6248 return WEXITSTATUS(status);
6249 } else if (WIFSIGNALED(status)) {
6250 // The child exited because of a signal
6251 // The best value to return is 0x80 + signal number,
6252 // because that is what all Unix shells do, and because
6253 // it allows callers to distinguish between process exit and
6254 // process death by signal.
6255 return 0x80 + WTERMSIG(status);
6256 } else {
6257 // Unknown exit code; pass it through
6258 return status;
6259 }
6260 }
6261 }
6263 // is_headless_jre()
6264 //
6265 // Test for the existence of libmawt in motif21 or xawt directories
6266 // in order to report if we are running in a headless jre
6267 //
6268 bool os::is_headless_jre() {
6269 struct stat statbuf;
6270 char buf[MAXPATHLEN];
6271 char libmawtpath[MAXPATHLEN];
6272 const char *xawtstr = "/xawt/libmawt.so";
6273 const char *motifstr = "/motif21/libmawt.so";
6274 char *p;
6276 // Get path to libjvm.so
6277 os::jvm_path(buf, sizeof(buf));
6279 // Get rid of libjvm.so
6280 p = strrchr(buf, '/');
6281 if (p == NULL) return false;
6282 else *p = '\0';
6284 // Get rid of client or server
6285 p = strrchr(buf, '/');
6286 if (p == NULL) return false;
6287 else *p = '\0';
6289 // check xawt/libmawt.so
6290 strcpy(libmawtpath, buf);
6291 strcat(libmawtpath, xawtstr);
6292 if (::stat(libmawtpath, &statbuf) == 0) return false;
6294 // check motif21/libmawt.so
6295 strcpy(libmawtpath, buf);
6296 strcat(libmawtpath, motifstr);
6297 if (::stat(libmawtpath, &statbuf) == 0) return false;
6299 return true;
6300 }
6302 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6303 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6304 }
6306 int os::close(int fd) {
6307 RESTARTABLE_RETURN_INT(::close(fd));
6308 }
6310 int os::socket_close(int fd) {
6311 RESTARTABLE_RETURN_INT(::close(fd));
6312 }
6314 int os::recv(int fd, char *buf, int nBytes, int flags) {
6315 INTERRUPTIBLE_RETURN_INT(::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6316 }
6319 int os::send(int fd, char *buf, int nBytes, int flags) {
6320 INTERRUPTIBLE_RETURN_INT(::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6321 }
6323 int os::raw_send(int fd, char *buf, int nBytes, int flags) {
6324 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
6325 }
6327 // As both poll and select can be interrupted by signals, we have to be
6328 // prepared to restart the system call after updating the timeout, unless
6329 // a poll() is done with timeout == -1, in which case we repeat with this
6330 // "wait forever" value.
6332 int os::timeout(int fd, long timeout) {
6333 int res;
6334 struct timeval t;
6335 julong prevtime, newtime;
6336 static const char* aNull = 0;
6337 struct pollfd pfd;
6338 pfd.fd = fd;
6339 pfd.events = POLLIN;
6341 gettimeofday(&t, &aNull);
6342 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6344 for(;;) {
6345 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6346 if(res == OS_ERR && errno == EINTR) {
6347 if(timeout != -1) {
6348 gettimeofday(&t, &aNull);
6349 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6350 timeout -= newtime - prevtime;
6351 if(timeout <= 0)
6352 return OS_OK;
6353 prevtime = newtime;
6354 }
6355 } else return res;
6356 }
6357 }
6359 int os::connect(int fd, struct sockaddr *him, int len) {
6360 int _result;
6361 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,
6362 os::Solaris::clear_interrupted);
6364 // Depending on when thread interruption is reset, _result could be
6365 // one of two values when errno == EINTR
6367 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6368 && (errno == EINTR)) {
6369 /* restarting a connect() changes its errno semantics */
6370 INTERRUPTIBLE(::connect(fd, him, len), _result,
6371 os::Solaris::clear_interrupted);
6372 /* undo these changes */
6373 if (_result == OS_ERR) {
6374 if (errno == EALREADY) {
6375 errno = EINPROGRESS; /* fall through */
6376 } else if (errno == EISCONN) {
6377 errno = 0;
6378 return OS_OK;
6379 }
6380 }
6381 }
6382 return _result;
6383 }
6385 int os::accept(int fd, struct sockaddr *him, int *len) {
6386 if (fd < 0)
6387 return OS_ERR;
6388 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him,\
6389 (socklen_t*) len), os::Solaris::clear_interrupted);
6390 }
6392 int os::recvfrom(int fd, char *buf, int nBytes, int flags,
6393 sockaddr *from, int *fromlen) {
6394 //%%note jvm_r11
6395 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes,\
6396 flags, from, fromlen), os::Solaris::clear_interrupted);
6397 }
6399 int os::sendto(int fd, char *buf, int len, int flags,
6400 struct sockaddr *to, int tolen) {
6401 //%%note jvm_r11
6402 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags,\
6403 to, tolen), os::Solaris::clear_interrupted);
6404 }
6406 int os::socket_available(int fd, jint *pbytes) {
6407 if (fd < 0)
6408 return OS_OK;
6410 int ret;
6412 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6414 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
6415 // is expected to return 0 on failure and 1 on success to the jdk.
6417 return (ret == OS_ERR) ? 0 : 1;
6418 }
6421 int os::bind(int fd, struct sockaddr *him, int len) {
6422 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6423 os::Solaris::clear_interrupted);
6424 }