Fri, 07 Jan 2011 10:42:32 -0500
7003271: Hotspot should track cumulative Java heap bytes allocated on a per-thread basis
Summary: Track allocated bytes in Thread's, update on TLAB retirement and direct allocation in Eden and tenured, add JNI methods for ThreadMXBean.
Reviewed-by: coleenp, kvn, dholmes, ysr
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 const char* os::get_temp_directory() {
1888 const char *prop = Arguments::get_property("java.io.tmpdir");
1889 return prop == NULL ? "/tmp" : prop;
1890 }
1892 static bool file_exists(const char* filename) {
1893 struct stat statbuf;
1894 if (filename == NULL || strlen(filename) == 0) {
1895 return false;
1896 }
1897 return os::stat(filename, &statbuf) == 0;
1898 }
1900 void os::dll_build_name(char* buffer, size_t buflen,
1901 const char* pname, const char* fname) {
1902 const size_t pnamelen = pname ? strlen(pname) : 0;
1904 // Quietly truncate on buffer overflow. Should be an error.
1905 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1906 *buffer = '\0';
1907 return;
1908 }
1910 if (pnamelen == 0) {
1911 snprintf(buffer, buflen, "lib%s.so", fname);
1912 } else if (strchr(pname, *os::path_separator()) != NULL) {
1913 int n;
1914 char** pelements = split_path(pname, &n);
1915 for (int i = 0 ; i < n ; i++) {
1916 // really shouldn't be NULL but what the heck, check can't hurt
1917 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1918 continue; // skip the empty path values
1919 }
1920 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1921 if (file_exists(buffer)) {
1922 break;
1923 }
1924 }
1925 // release the storage
1926 for (int i = 0 ; i < n ; i++) {
1927 if (pelements[i] != NULL) {
1928 FREE_C_HEAP_ARRAY(char, pelements[i]);
1929 }
1930 }
1931 if (pelements != NULL) {
1932 FREE_C_HEAP_ARRAY(char*, pelements);
1933 }
1934 } else {
1935 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1936 }
1937 }
1939 const char* os::get_current_directory(char *buf, int buflen) {
1940 return getcwd(buf, buflen);
1941 }
1943 // check if addr is inside libjvm[_g].so
1944 bool os::address_is_in_vm(address addr) {
1945 static address libjvm_base_addr;
1946 Dl_info dlinfo;
1948 if (libjvm_base_addr == NULL) {
1949 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
1950 libjvm_base_addr = (address)dlinfo.dli_fbase;
1951 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1952 }
1954 if (dladdr((void *)addr, &dlinfo)) {
1955 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1956 }
1958 return false;
1959 }
1961 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1962 static dladdr1_func_type dladdr1_func = NULL;
1964 bool os::dll_address_to_function_name(address addr, char *buf,
1965 int buflen, int * offset) {
1966 Dl_info dlinfo;
1968 // dladdr1_func was initialized in os::init()
1969 if (dladdr1_func){
1970 // yes, we have dladdr1
1972 // Support for dladdr1 is checked at runtime; it may be
1973 // available even if the vm is built on a machine that does
1974 // not have dladdr1 support. Make sure there is a value for
1975 // RTLD_DL_SYMENT.
1976 #ifndef RTLD_DL_SYMENT
1977 #define RTLD_DL_SYMENT 1
1978 #endif
1979 Sym * info;
1980 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1981 RTLD_DL_SYMENT)) {
1982 if ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1983 if (buf != NULL) {
1984 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
1985 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1986 }
1987 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1988 return true;
1989 }
1990 }
1991 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
1992 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1993 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) {
1994 return true;
1995 }
1996 }
1997 if (buf != NULL) buf[0] = '\0';
1998 if (offset != NULL) *offset = -1;
1999 return false;
2000 } else {
2001 // no, only dladdr is available
2002 if (dladdr((void *)addr, &dlinfo)) {
2003 if (buf != NULL) {
2004 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen))
2005 jio_snprintf(buf, buflen, dlinfo.dli_sname);
2006 }
2007 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
2008 return true;
2009 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
2010 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
2011 dlinfo.dli_fname, buf, buflen, offset) == Decoder::no_error) {
2012 return true;
2013 }
2014 }
2015 if (buf != NULL) buf[0] = '\0';
2016 if (offset != NULL) *offset = -1;
2017 return false;
2018 }
2019 }
2021 bool os::dll_address_to_library_name(address addr, char* buf,
2022 int buflen, int* offset) {
2023 Dl_info dlinfo;
2025 if (dladdr((void*)addr, &dlinfo)){
2026 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
2027 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
2028 return true;
2029 } else {
2030 if (buf) buf[0] = '\0';
2031 if (offset) *offset = -1;
2032 return false;
2033 }
2034 }
2036 // Prints the names and full paths of all opened dynamic libraries
2037 // for current process
2038 void os::print_dll_info(outputStream * st) {
2039 Dl_info dli;
2040 void *handle;
2041 Link_map *map;
2042 Link_map *p;
2044 st->print_cr("Dynamic libraries:"); st->flush();
2046 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
2047 st->print_cr("Error: Cannot print dynamic libraries.");
2048 return;
2049 }
2050 handle = dlopen(dli.dli_fname, RTLD_LAZY);
2051 if (handle == NULL) {
2052 st->print_cr("Error: Cannot print dynamic libraries.");
2053 return;
2054 }
2055 dlinfo(handle, RTLD_DI_LINKMAP, &map);
2056 if (map == NULL) {
2057 st->print_cr("Error: Cannot print dynamic libraries.");
2058 return;
2059 }
2061 while (map->l_prev != NULL)
2062 map = map->l_prev;
2064 while (map != NULL) {
2065 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
2066 map = map->l_next;
2067 }
2069 dlclose(handle);
2070 }
2072 // Loads .dll/.so and
2073 // in case of error it checks if .dll/.so was built for the
2074 // same architecture as Hotspot is running on
2076 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
2077 {
2078 void * result= ::dlopen(filename, RTLD_LAZY);
2079 if (result != NULL) {
2080 // Successful loading
2081 return result;
2082 }
2084 Elf32_Ehdr elf_head;
2086 // Read system error message into ebuf
2087 // It may or may not be overwritten below
2088 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
2089 ebuf[ebuflen-1]='\0';
2090 int diag_msg_max_length=ebuflen-strlen(ebuf);
2091 char* diag_msg_buf=ebuf+strlen(ebuf);
2093 if (diag_msg_max_length==0) {
2094 // No more space in ebuf for additional diagnostics message
2095 return NULL;
2096 }
2099 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
2101 if (file_descriptor < 0) {
2102 // Can't open library, report dlerror() message
2103 return NULL;
2104 }
2106 bool failed_to_read_elf_head=
2107 (sizeof(elf_head)!=
2108 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
2110 ::close(file_descriptor);
2111 if (failed_to_read_elf_head) {
2112 // file i/o error - report dlerror() msg
2113 return NULL;
2114 }
2116 typedef struct {
2117 Elf32_Half code; // Actual value as defined in elf.h
2118 Elf32_Half compat_class; // Compatibility of archs at VM's sense
2119 char elf_class; // 32 or 64 bit
2120 char endianess; // MSB or LSB
2121 char* name; // String representation
2122 } arch_t;
2124 static const arch_t arch_array[]={
2125 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2126 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
2127 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
2128 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
2129 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2130 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
2131 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
2132 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
2133 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
2134 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
2135 };
2137 #if (defined IA32)
2138 static Elf32_Half running_arch_code=EM_386;
2139 #elif (defined AMD64)
2140 static Elf32_Half running_arch_code=EM_X86_64;
2141 #elif (defined IA64)
2142 static Elf32_Half running_arch_code=EM_IA_64;
2143 #elif (defined __sparc) && (defined _LP64)
2144 static Elf32_Half running_arch_code=EM_SPARCV9;
2145 #elif (defined __sparc) && (!defined _LP64)
2146 static Elf32_Half running_arch_code=EM_SPARC;
2147 #elif (defined __powerpc64__)
2148 static Elf32_Half running_arch_code=EM_PPC64;
2149 #elif (defined __powerpc__)
2150 static Elf32_Half running_arch_code=EM_PPC;
2151 #elif (defined ARM)
2152 static Elf32_Half running_arch_code=EM_ARM;
2153 #else
2154 #error Method os::dll_load requires that one of following is defined:\
2155 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
2156 #endif
2158 // Identify compatability class for VM's architecture and library's architecture
2159 // Obtain string descriptions for architectures
2161 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
2162 int running_arch_index=-1;
2164 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
2165 if (running_arch_code == arch_array[i].code) {
2166 running_arch_index = i;
2167 }
2168 if (lib_arch.code == arch_array[i].code) {
2169 lib_arch.compat_class = arch_array[i].compat_class;
2170 lib_arch.name = arch_array[i].name;
2171 }
2172 }
2174 assert(running_arch_index != -1,
2175 "Didn't find running architecture code (running_arch_code) in arch_array");
2176 if (running_arch_index == -1) {
2177 // Even though running architecture detection failed
2178 // we may still continue with reporting dlerror() message
2179 return NULL;
2180 }
2182 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
2183 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
2184 return NULL;
2185 }
2187 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
2188 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
2189 return NULL;
2190 }
2192 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
2193 if ( lib_arch.name!=NULL ) {
2194 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2195 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
2196 lib_arch.name, arch_array[running_arch_index].name);
2197 } else {
2198 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
2199 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
2200 lib_arch.code,
2201 arch_array[running_arch_index].name);
2202 }
2203 }
2205 return NULL;
2206 }
2208 void* os::dll_lookup(void* handle, const char* name) {
2209 return dlsym(handle, name);
2210 }
2212 int os::stat(const char *path, struct stat *sbuf) {
2213 char pathbuf[MAX_PATH];
2214 if (strlen(path) > MAX_PATH - 1) {
2215 errno = ENAMETOOLONG;
2216 return -1;
2217 }
2218 os::native_path(strcpy(pathbuf, path));
2219 return ::stat(pathbuf, sbuf);
2220 }
2222 static bool _print_ascii_file(const char* filename, outputStream* st) {
2223 int fd = ::open(filename, O_RDONLY);
2224 if (fd == -1) {
2225 return false;
2226 }
2228 char buf[32];
2229 int bytes;
2230 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
2231 st->print_raw(buf, bytes);
2232 }
2234 ::close(fd);
2236 return true;
2237 }
2239 void os::print_os_info(outputStream* st) {
2240 st->print("OS:");
2242 if (!_print_ascii_file("/etc/release", st)) {
2243 st->print("Solaris");
2244 }
2245 st->cr();
2247 // kernel
2248 st->print("uname:");
2249 struct utsname name;
2250 uname(&name);
2251 st->print(name.sysname); st->print(" ");
2252 st->print(name.release); st->print(" ");
2253 st->print(name.version); st->print(" ");
2254 st->print(name.machine);
2256 // libthread
2257 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)");
2258 else st->print(" (T1 libthread)");
2259 st->cr();
2261 // rlimit
2262 st->print("rlimit:");
2263 struct rlimit rlim;
2265 st->print(" STACK ");
2266 getrlimit(RLIMIT_STACK, &rlim);
2267 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2268 else st->print("%uk", rlim.rlim_cur >> 10);
2270 st->print(", CORE ");
2271 getrlimit(RLIMIT_CORE, &rlim);
2272 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2273 else st->print("%uk", rlim.rlim_cur >> 10);
2275 st->print(", NOFILE ");
2276 getrlimit(RLIMIT_NOFILE, &rlim);
2277 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2278 else st->print("%d", rlim.rlim_cur);
2280 st->print(", AS ");
2281 getrlimit(RLIMIT_AS, &rlim);
2282 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
2283 else st->print("%uk", rlim.rlim_cur >> 10);
2284 st->cr();
2286 // load average
2287 st->print("load average:");
2288 double loadavg[3];
2289 os::loadavg(loadavg, 3);
2290 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
2291 st->cr();
2292 }
2295 static bool check_addr0(outputStream* st) {
2296 jboolean status = false;
2297 int fd = ::open("/proc/self/map",O_RDONLY);
2298 if (fd >= 0) {
2299 prmap_t p;
2300 while(::read(fd, &p, sizeof(p)) > 0) {
2301 if (p.pr_vaddr == 0x0) {
2302 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2303 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2304 st->print("Access:");
2305 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2306 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2307 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2308 st->cr();
2309 status = true;
2310 }
2311 ::close(fd);
2312 }
2313 }
2314 return status;
2315 }
2317 void os::print_memory_info(outputStream* st) {
2318 st->print("Memory:");
2319 st->print(" %dk page", os::vm_page_size()>>10);
2320 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2321 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2322 st->cr();
2323 (void) check_addr0(st);
2324 }
2326 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific
2327 // but they're the same for all the solaris architectures that we support.
2328 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
2329 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
2330 "ILL_COPROC", "ILL_BADSTK" };
2332 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
2333 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
2334 "FPE_FLTINV", "FPE_FLTSUB" };
2336 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
2338 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
2340 void os::print_siginfo(outputStream* st, void* siginfo) {
2341 st->print("siginfo:");
2343 const int buflen = 100;
2344 char buf[buflen];
2345 siginfo_t *si = (siginfo_t*)siginfo;
2346 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
2347 char *err = strerror(si->si_errno);
2348 if (si->si_errno != 0 && err != NULL) {
2349 st->print("si_errno=%s", err);
2350 } else {
2351 st->print("si_errno=%d", si->si_errno);
2352 }
2353 const int c = si->si_code;
2354 assert(c > 0, "unexpected si_code");
2355 switch (si->si_signo) {
2356 case SIGILL:
2357 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
2358 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2359 break;
2360 case SIGFPE:
2361 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
2362 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2363 break;
2364 case SIGSEGV:
2365 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
2366 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2367 break;
2368 case SIGBUS:
2369 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
2370 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
2371 break;
2372 default:
2373 st->print(", si_code=%d", si->si_code);
2374 // no si_addr
2375 }
2377 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2378 UseSharedSpaces) {
2379 FileMapInfo* mapinfo = FileMapInfo::current_info();
2380 if (mapinfo->is_in_shared_space(si->si_addr)) {
2381 st->print("\n\nError accessing class data sharing archive." \
2382 " Mapped file inaccessible during execution, " \
2383 " possible disk/network problem.");
2384 }
2385 }
2386 st->cr();
2387 }
2389 // Moved from whole group, because we need them here for diagnostic
2390 // prints.
2391 #define OLDMAXSIGNUM 32
2392 static int Maxsignum = 0;
2393 static int *ourSigFlags = NULL;
2395 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2397 int os::Solaris::get_our_sigflags(int sig) {
2398 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2399 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2400 return ourSigFlags[sig];
2401 }
2403 void os::Solaris::set_our_sigflags(int sig, int flags) {
2404 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2405 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2406 ourSigFlags[sig] = flags;
2407 }
2410 static const char* get_signal_handler_name(address handler,
2411 char* buf, int buflen) {
2412 int offset;
2413 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2414 if (found) {
2415 // skip directory names
2416 const char *p1, *p2;
2417 p1 = buf;
2418 size_t len = strlen(os::file_separator());
2419 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2420 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2421 } else {
2422 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2423 }
2424 return buf;
2425 }
2427 static void print_signal_handler(outputStream* st, int sig,
2428 char* buf, size_t buflen) {
2429 struct sigaction sa;
2431 sigaction(sig, NULL, &sa);
2433 st->print("%s: ", os::exception_name(sig, buf, buflen));
2435 address handler = (sa.sa_flags & SA_SIGINFO)
2436 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2437 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2439 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2440 st->print("SIG_DFL");
2441 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2442 st->print("SIG_IGN");
2443 } else {
2444 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2445 }
2447 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask);
2449 address rh = VMError::get_resetted_sighandler(sig);
2450 // May be, handler was resetted by VMError?
2451 if(rh != NULL) {
2452 handler = rh;
2453 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2454 }
2456 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags);
2458 // Check: is it our handler?
2459 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2460 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2461 // It is our signal handler
2462 // check for flags
2463 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2464 st->print(
2465 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2466 os::Solaris::get_our_sigflags(sig));
2467 }
2468 }
2469 st->cr();
2470 }
2472 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2473 st->print_cr("Signal Handlers:");
2474 print_signal_handler(st, SIGSEGV, buf, buflen);
2475 print_signal_handler(st, SIGBUS , buf, buflen);
2476 print_signal_handler(st, SIGFPE , buf, buflen);
2477 print_signal_handler(st, SIGPIPE, buf, buflen);
2478 print_signal_handler(st, SIGXFSZ, buf, buflen);
2479 print_signal_handler(st, SIGILL , buf, buflen);
2480 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2481 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2482 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2483 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2484 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2485 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2486 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2487 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2488 }
2490 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2492 // Find the full path to the current module, libjvm.so or libjvm_g.so
2493 void os::jvm_path(char *buf, jint buflen) {
2494 // Error checking.
2495 if (buflen < MAXPATHLEN) {
2496 assert(false, "must use a large-enough buffer");
2497 buf[0] = '\0';
2498 return;
2499 }
2500 // Lazy resolve the path to current module.
2501 if (saved_jvm_path[0] != 0) {
2502 strcpy(buf, saved_jvm_path);
2503 return;
2504 }
2506 Dl_info dlinfo;
2507 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2508 assert(ret != 0, "cannot locate libjvm");
2509 realpath((char *)dlinfo.dli_fname, buf);
2511 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) {
2512 // Support for the gamma launcher. Typical value for buf is
2513 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2514 // the right place in the string, then assume we are installed in a JDK and
2515 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2516 // up the path so it looks like libjvm.so is installed there (append a
2517 // fake suffix hotspot/libjvm.so).
2518 const char *p = buf + strlen(buf) - 1;
2519 for (int count = 0; p > buf && count < 5; ++count) {
2520 for (--p; p > buf && *p != '/'; --p)
2521 /* empty */ ;
2522 }
2524 if (strncmp(p, "/jre/lib/", 9) != 0) {
2525 // Look for JAVA_HOME in the environment.
2526 char* java_home_var = ::getenv("JAVA_HOME");
2527 if (java_home_var != NULL && java_home_var[0] != 0) {
2528 char cpu_arch[12];
2529 char* jrelib_p;
2530 int len;
2531 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2532 #ifdef _LP64
2533 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2534 if (strcmp(cpu_arch, "sparc") == 0) {
2535 strcat(cpu_arch, "v9");
2536 } else if (strcmp(cpu_arch, "i386") == 0) {
2537 strcpy(cpu_arch, "amd64");
2538 }
2539 #endif
2540 // Check the current module name "libjvm.so" or "libjvm_g.so".
2541 p = strrchr(buf, '/');
2542 assert(strstr(p, "/libjvm") == p, "invalid library name");
2543 p = strstr(p, "_g") ? "_g" : "";
2545 realpath(java_home_var, buf);
2546 // determine if this is a legacy image or modules image
2547 // modules image doesn't have "jre" subdirectory
2548 len = strlen(buf);
2549 jrelib_p = buf + len;
2550 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2551 if (0 != access(buf, F_OK)) {
2552 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2553 }
2555 if (0 == access(buf, F_OK)) {
2556 // Use current module name "libjvm[_g].so" instead of
2557 // "libjvm"debug_only("_g")".so" since for fastdebug version
2558 // we should have "libjvm.so" but debug_only("_g") adds "_g"!
2559 len = strlen(buf);
2560 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p);
2561 } else {
2562 // Go back to path of .so
2563 realpath((char *)dlinfo.dli_fname, buf);
2564 }
2565 }
2566 }
2567 }
2569 strcpy(saved_jvm_path, buf);
2570 }
2573 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2574 // no prefix required, not even "_"
2575 }
2578 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2579 // no suffix required
2580 }
2582 // This method is a copy of JDK's sysGetLastErrorString
2583 // from src/solaris/hpi/src/system_md.c
2585 size_t os::lasterror(char *buf, size_t len) {
2587 if (errno == 0) return 0;
2589 const char *s = ::strerror(errno);
2590 size_t n = ::strlen(s);
2591 if (n >= len) {
2592 n = len - 1;
2593 }
2594 ::strncpy(buf, s, n);
2595 buf[n] = '\0';
2596 return n;
2597 }
2600 // sun.misc.Signal
2602 extern "C" {
2603 static void UserHandler(int sig, void *siginfo, void *context) {
2604 // Ctrl-C is pressed during error reporting, likely because the error
2605 // handler fails to abort. Let VM die immediately.
2606 if (sig == SIGINT && is_error_reported()) {
2607 os::die();
2608 }
2610 os::signal_notify(sig);
2611 // We do not need to reinstate the signal handler each time...
2612 }
2613 }
2615 void* os::user_handler() {
2616 return CAST_FROM_FN_PTR(void*, UserHandler);
2617 }
2619 extern "C" {
2620 typedef void (*sa_handler_t)(int);
2621 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2622 }
2624 void* os::signal(int signal_number, void* handler) {
2625 struct sigaction sigAct, oldSigAct;
2626 sigfillset(&(sigAct.sa_mask));
2627 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2628 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2630 if (sigaction(signal_number, &sigAct, &oldSigAct))
2631 // -1 means registration failed
2632 return (void *)-1;
2634 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2635 }
2637 void os::signal_raise(int signal_number) {
2638 raise(signal_number);
2639 }
2641 /*
2642 * The following code is moved from os.cpp for making this
2643 * code platform specific, which it is by its very nature.
2644 */
2646 // a counter for each possible signal value
2647 static int Sigexit = 0;
2648 static int Maxlibjsigsigs;
2649 static jint *pending_signals = NULL;
2650 static int *preinstalled_sigs = NULL;
2651 static struct sigaction *chainedsigactions = NULL;
2652 static sema_t sig_sem;
2653 typedef int (*version_getting_t)();
2654 version_getting_t os::Solaris::get_libjsig_version = NULL;
2655 static int libjsigversion = NULL;
2657 int os::sigexitnum_pd() {
2658 assert(Sigexit > 0, "signal memory not yet initialized");
2659 return Sigexit;
2660 }
2662 void os::Solaris::init_signal_mem() {
2663 // Initialize signal structures
2664 Maxsignum = SIGRTMAX;
2665 Sigexit = Maxsignum+1;
2666 assert(Maxsignum >0, "Unable to obtain max signal number");
2668 Maxlibjsigsigs = Maxsignum;
2670 // pending_signals has one int per signal
2671 // The additional signal is for SIGEXIT - exit signal to signal_thread
2672 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1));
2673 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2675 if (UseSignalChaining) {
2676 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2677 * (Maxsignum + 1));
2678 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2679 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1));
2680 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2681 }
2682 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ));
2683 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2684 }
2686 void os::signal_init_pd() {
2687 int ret;
2689 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2690 assert(ret == 0, "sema_init() failed");
2691 }
2693 void os::signal_notify(int signal_number) {
2694 int ret;
2696 Atomic::inc(&pending_signals[signal_number]);
2697 ret = ::sema_post(&sig_sem);
2698 assert(ret == 0, "sema_post() failed");
2699 }
2701 static int check_pending_signals(bool wait_for_signal) {
2702 int ret;
2703 while (true) {
2704 for (int i = 0; i < Sigexit + 1; i++) {
2705 jint n = pending_signals[i];
2706 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2707 return i;
2708 }
2709 }
2710 if (!wait_for_signal) {
2711 return -1;
2712 }
2713 JavaThread *thread = JavaThread::current();
2714 ThreadBlockInVM tbivm(thread);
2716 bool threadIsSuspended;
2717 do {
2718 thread->set_suspend_equivalent();
2719 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2720 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2721 ;
2722 assert(ret == 0, "sema_wait() failed");
2724 // were we externally suspended while we were waiting?
2725 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2726 if (threadIsSuspended) {
2727 //
2728 // The semaphore has been incremented, but while we were waiting
2729 // another thread suspended us. We don't want to continue running
2730 // while suspended because that would surprise the thread that
2731 // suspended us.
2732 //
2733 ret = ::sema_post(&sig_sem);
2734 assert(ret == 0, "sema_post() failed");
2736 thread->java_suspend_self();
2737 }
2738 } while (threadIsSuspended);
2739 }
2740 }
2742 int os::signal_lookup() {
2743 return check_pending_signals(false);
2744 }
2746 int os::signal_wait() {
2747 return check_pending_signals(true);
2748 }
2750 ////////////////////////////////////////////////////////////////////////////////
2751 // Virtual Memory
2753 static int page_size = -1;
2755 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2756 // clear this var if support is not available.
2757 static bool has_map_align = true;
2759 int os::vm_page_size() {
2760 assert(page_size != -1, "must call os::init");
2761 return page_size;
2762 }
2764 // Solaris allocates memory by pages.
2765 int os::vm_allocation_granularity() {
2766 assert(page_size != -1, "must call os::init");
2767 return page_size;
2768 }
2770 bool os::commit_memory(char* addr, size_t bytes, bool exec) {
2771 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2772 size_t size = bytes;
2773 return
2774 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2775 }
2777 bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2778 bool exec) {
2779 if (commit_memory(addr, bytes, exec)) {
2780 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
2781 // If the large page size has been set and the VM
2782 // is using large pages, use the large page size
2783 // if it is smaller than the alignment hint. This is
2784 // a case where the VM wants to use a larger alignment size
2785 // for its own reasons but still want to use large pages
2786 // (which is what matters to setting the mpss range.
2787 size_t page_size = 0;
2788 if (large_page_size() < alignment_hint) {
2789 assert(UseLargePages, "Expected to be here for large page use only");
2790 page_size = large_page_size();
2791 } else {
2792 // If the alignment hint is less than the large page
2793 // size, the VM wants a particular alignment (thus the hint)
2794 // for internal reasons. Try to set the mpss range using
2795 // the alignment_hint.
2796 page_size = alignment_hint;
2797 }
2798 // Since this is a hint, ignore any failures.
2799 (void)Solaris::set_mpss_range(addr, bytes, page_size);
2800 }
2801 return true;
2802 }
2803 return false;
2804 }
2806 // Uncommit the pages in a specified region.
2807 void os::free_memory(char* addr, size_t bytes) {
2808 if (madvise(addr, bytes, MADV_FREE) < 0) {
2809 debug_only(warning("MADV_FREE failed."));
2810 return;
2811 }
2812 }
2814 bool os::create_stack_guard_pages(char* addr, size_t size) {
2815 return os::commit_memory(addr, size);
2816 }
2818 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2819 return os::uncommit_memory(addr, size);
2820 }
2822 // Change the page size in a given range.
2823 void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2824 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2825 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2826 Solaris::set_mpss_range(addr, bytes, alignment_hint);
2827 }
2829 // Tell the OS to make the range local to the first-touching LWP
2830 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2831 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2832 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2833 debug_only(warning("MADV_ACCESS_LWP failed."));
2834 }
2835 }
2837 // Tell the OS that this range would be accessed from different LWPs.
2838 void os::numa_make_global(char *addr, size_t bytes) {
2839 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2840 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2841 debug_only(warning("MADV_ACCESS_MANY failed."));
2842 }
2843 }
2845 // Get the number of the locality groups.
2846 size_t os::numa_get_groups_num() {
2847 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2848 return n != -1 ? n : 1;
2849 }
2851 // Get a list of leaf locality groups. A leaf lgroup is group that
2852 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2853 // board. An LWP is assigned to one of these groups upon creation.
2854 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2855 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2856 ids[0] = 0;
2857 return 1;
2858 }
2859 int result_size = 0, top = 1, bottom = 0, cur = 0;
2860 for (int k = 0; k < size; k++) {
2861 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2862 (Solaris::lgrp_id_t*)&ids[top], size - top);
2863 if (r == -1) {
2864 ids[0] = 0;
2865 return 1;
2866 }
2867 if (!r) {
2868 // That's a leaf node.
2869 assert (bottom <= cur, "Sanity check");
2870 // Check if the node has memory
2871 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2872 NULL, 0, LGRP_RSRC_MEM) > 0) {
2873 ids[bottom++] = ids[cur];
2874 }
2875 }
2876 top += r;
2877 cur++;
2878 }
2879 if (bottom == 0) {
2880 // Handle a situation, when the OS reports no memory available.
2881 // Assume UMA architecture.
2882 ids[0] = 0;
2883 return 1;
2884 }
2885 return bottom;
2886 }
2888 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2889 bool os::numa_topology_changed() {
2890 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2891 if (is_stale != -1 && is_stale) {
2892 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2893 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2894 assert(c != 0, "Failure to initialize LGRP API");
2895 Solaris::set_lgrp_cookie(c);
2896 return true;
2897 }
2898 return false;
2899 }
2901 // Get the group id of the current LWP.
2902 int os::numa_get_group_id() {
2903 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2904 if (lgrp_id == -1) {
2905 return 0;
2906 }
2907 const int size = os::numa_get_groups_num();
2908 int *ids = (int*)alloca(size * sizeof(int));
2910 // Get the ids of all lgroups with memory; r is the count.
2911 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2912 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2913 if (r <= 0) {
2914 return 0;
2915 }
2916 return ids[os::random() % r];
2917 }
2919 // Request information about the page.
2920 bool os::get_page_info(char *start, page_info* info) {
2921 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2922 uint64_t addr = (uintptr_t)start;
2923 uint64_t outdata[2];
2924 uint_t validity = 0;
2926 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2927 return false;
2928 }
2930 info->size = 0;
2931 info->lgrp_id = -1;
2933 if ((validity & 1) != 0) {
2934 if ((validity & 2) != 0) {
2935 info->lgrp_id = outdata[0];
2936 }
2937 if ((validity & 4) != 0) {
2938 info->size = outdata[1];
2939 }
2940 return true;
2941 }
2942 return false;
2943 }
2945 // Scan the pages from start to end until a page different than
2946 // the one described in the info parameter is encountered.
2947 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2948 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2949 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2950 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT];
2951 uint_t validity[MAX_MEMINFO_CNT];
2953 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2954 uint64_t p = (uint64_t)start;
2955 while (p < (uint64_t)end) {
2956 addrs[0] = p;
2957 size_t addrs_count = 1;
2958 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) {
2959 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2960 addrs_count++;
2961 }
2963 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2964 return NULL;
2965 }
2967 size_t i = 0;
2968 for (; i < addrs_count; i++) {
2969 if ((validity[i] & 1) != 0) {
2970 if ((validity[i] & 4) != 0) {
2971 if (outdata[types * i + 1] != page_expected->size) {
2972 break;
2973 }
2974 } else
2975 if (page_expected->size != 0) {
2976 break;
2977 }
2979 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2980 if (outdata[types * i] != page_expected->lgrp_id) {
2981 break;
2982 }
2983 }
2984 } else {
2985 return NULL;
2986 }
2987 }
2989 if (i != addrs_count) {
2990 if ((validity[i] & 2) != 0) {
2991 page_found->lgrp_id = outdata[types * i];
2992 } else {
2993 page_found->lgrp_id = -1;
2994 }
2995 if ((validity[i] & 4) != 0) {
2996 page_found->size = outdata[types * i + 1];
2997 } else {
2998 page_found->size = 0;
2999 }
3000 return (char*)addrs[i];
3001 }
3003 p = addrs[addrs_count - 1] + page_size;
3004 }
3005 return end;
3006 }
3008 bool os::uncommit_memory(char* addr, size_t bytes) {
3009 size_t size = bytes;
3010 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3011 // uncommitted page. Otherwise, the read/write might succeed if we
3012 // have enough swap space to back the physical page.
3013 return
3014 NULL != Solaris::mmap_chunk(addr, size,
3015 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
3016 PROT_NONE);
3017 }
3019 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
3020 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
3022 if (b == MAP_FAILED) {
3023 return NULL;
3024 }
3025 return b;
3026 }
3028 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
3029 char* addr = requested_addr;
3030 int flags = MAP_PRIVATE | MAP_NORESERVE;
3032 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
3034 if (fixed) {
3035 flags |= MAP_FIXED;
3036 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
3037 flags |= MAP_ALIGN;
3038 addr = (char*) alignment_hint;
3039 }
3041 // Map uncommitted pages PROT_NONE so we fail early if we touch an
3042 // uncommitted page. Otherwise, the read/write might succeed if we
3043 // have enough swap space to back the physical page.
3044 return mmap_chunk(addr, bytes, flags, PROT_NONE);
3045 }
3047 char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
3048 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
3050 guarantee(requested_addr == NULL || requested_addr == addr,
3051 "OS failed to return requested mmap address.");
3052 return addr;
3053 }
3055 // Reserve memory at an arbitrary address, only if that area is
3056 // available (and not reserved for something else).
3058 char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
3059 const int max_tries = 10;
3060 char* base[max_tries];
3061 size_t size[max_tries];
3063 // Solaris adds a gap between mmap'ed regions. The size of the gap
3064 // is dependent on the requested size and the MMU. Our initial gap
3065 // value here is just a guess and will be corrected later.
3066 bool had_top_overlap = false;
3067 bool have_adjusted_gap = false;
3068 size_t gap = 0x400000;
3070 // Assert only that the size is a multiple of the page size, since
3071 // that's all that mmap requires, and since that's all we really know
3072 // about at this low abstraction level. If we need higher alignment,
3073 // we can either pass an alignment to this method or verify alignment
3074 // in one of the methods further up the call chain. See bug 5044738.
3075 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
3077 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
3078 // Give it a try, if the kernel honors the hint we can return immediately.
3079 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
3080 volatile int err = errno;
3081 if (addr == requested_addr) {
3082 return addr;
3083 } else if (addr != NULL) {
3084 unmap_memory(addr, bytes);
3085 }
3087 if (PrintMiscellaneous && Verbose) {
3088 char buf[256];
3089 buf[0] = '\0';
3090 if (addr == NULL) {
3091 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
3092 }
3093 warning("attempt_reserve_memory_at: couldn't reserve %d bytes at "
3094 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
3095 "%s", bytes, requested_addr, addr, buf);
3096 }
3098 // Address hint method didn't work. Fall back to the old method.
3099 // In theory, once SNV becomes our oldest supported platform, this
3100 // code will no longer be needed.
3101 //
3102 // Repeatedly allocate blocks until the block is allocated at the
3103 // right spot. Give up after max_tries.
3104 int i;
3105 for (i = 0; i < max_tries; ++i) {
3106 base[i] = reserve_memory(bytes);
3108 if (base[i] != NULL) {
3109 // Is this the block we wanted?
3110 if (base[i] == requested_addr) {
3111 size[i] = bytes;
3112 break;
3113 }
3115 // check that the gap value is right
3116 if (had_top_overlap && !have_adjusted_gap) {
3117 size_t actual_gap = base[i-1] - base[i] - bytes;
3118 if (gap != actual_gap) {
3119 // adjust the gap value and retry the last 2 allocations
3120 assert(i > 0, "gap adjustment code problem");
3121 have_adjusted_gap = true; // adjust the gap only once, just in case
3122 gap = actual_gap;
3123 if (PrintMiscellaneous && Verbose) {
3124 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
3125 }
3126 unmap_memory(base[i], bytes);
3127 unmap_memory(base[i-1], size[i-1]);
3128 i-=2;
3129 continue;
3130 }
3131 }
3133 // Does this overlap the block we wanted? Give back the overlapped
3134 // parts and try again.
3135 //
3136 // There is still a bug in this code: if top_overlap == bytes,
3137 // the overlap is offset from requested region by the value of gap.
3138 // In this case giving back the overlapped part will not work,
3139 // because we'll give back the entire block at base[i] and
3140 // therefore the subsequent allocation will not generate a new gap.
3141 // This could be fixed with a new algorithm that used larger
3142 // or variable size chunks to find the requested region -
3143 // but such a change would introduce additional complications.
3144 // It's rare enough that the planets align for this bug,
3145 // so we'll just wait for a fix for 6204603/5003415 which
3146 // will provide a mmap flag to allow us to avoid this business.
3148 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
3149 if (top_overlap >= 0 && top_overlap < bytes) {
3150 had_top_overlap = true;
3151 unmap_memory(base[i], top_overlap);
3152 base[i] += top_overlap;
3153 size[i] = bytes - top_overlap;
3154 } else {
3155 size_t bottom_overlap = base[i] + bytes - requested_addr;
3156 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
3157 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
3158 warning("attempt_reserve_memory_at: possible alignment bug");
3159 }
3160 unmap_memory(requested_addr, bottom_overlap);
3161 size[i] = bytes - bottom_overlap;
3162 } else {
3163 size[i] = bytes;
3164 }
3165 }
3166 }
3167 }
3169 // Give back the unused reserved pieces.
3171 for (int j = 0; j < i; ++j) {
3172 if (base[j] != NULL) {
3173 unmap_memory(base[j], size[j]);
3174 }
3175 }
3177 return (i < max_tries) ? requested_addr : NULL;
3178 }
3180 bool os::release_memory(char* addr, size_t bytes) {
3181 size_t size = bytes;
3182 return munmap(addr, size) == 0;
3183 }
3185 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3186 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3187 "addr must be page aligned");
3188 int retVal = mprotect(addr, bytes, prot);
3189 return retVal == 0;
3190 }
3192 // Protect memory (Used to pass readonly pages through
3193 // JNI GetArray<type>Elements with empty arrays.)
3194 // Also, used for serialization page and for compressed oops null pointer
3195 // checking.
3196 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3197 bool is_committed) {
3198 unsigned int p = 0;
3199 switch (prot) {
3200 case MEM_PROT_NONE: p = PROT_NONE; break;
3201 case MEM_PROT_READ: p = PROT_READ; break;
3202 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3203 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3204 default:
3205 ShouldNotReachHere();
3206 }
3207 // is_committed is unused.
3208 return solaris_mprotect(addr, bytes, p);
3209 }
3211 // guard_memory and unguard_memory only happens within stack guard pages.
3212 // Since ISM pertains only to the heap, guard and unguard memory should not
3213 /// happen with an ISM region.
3214 bool os::guard_memory(char* addr, size_t bytes) {
3215 return solaris_mprotect(addr, bytes, PROT_NONE);
3216 }
3218 bool os::unguard_memory(char* addr, size_t bytes) {
3219 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3220 }
3222 // Large page support
3224 // UseLargePages is the master flag to enable/disable large page memory.
3225 // UseMPSS and UseISM are supported for compatibility reasons. Their combined
3226 // effects can be described in the following table:
3227 //
3228 // UseLargePages UseMPSS UseISM
3229 // false * * => UseLargePages is the master switch, turning
3230 // it off will turn off both UseMPSS and
3231 // UseISM. VM will not use large page memory
3232 // regardless the settings of UseMPSS/UseISM.
3233 // true false false => Unless future Solaris provides other
3234 // mechanism to use large page memory, this
3235 // combination is equivalent to -UseLargePages,
3236 // VM will not use large page memory
3237 // true true false => JVM will use MPSS for large page memory.
3238 // This is the default behavior.
3239 // true false true => JVM will use ISM for large page memory.
3240 // true true true => JVM will use ISM if it is available.
3241 // Otherwise, JVM will fall back to MPSS.
3242 // Becaues ISM is now available on all
3243 // supported Solaris versions, this combination
3244 // is equivalent to +UseISM -UseMPSS.
3246 typedef int (*getpagesizes_func_type) (size_t[], int);
3247 static size_t _large_page_size = 0;
3249 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
3250 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address
3251 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc
3252 // can support multiple page sizes.
3254 // Don't bother to probe page size because getpagesizes() comes with MPSS.
3255 // ISM is only recommended on old Solaris where there is no MPSS support.
3256 // Simply choose a conservative value as default.
3257 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes :
3258 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M)
3259 ARM_ONLY(2 * M);
3261 // ISM is available on all supported Solaris versions
3262 return true;
3263 }
3265 // Insertion sort for small arrays (descending order).
3266 static void insertion_sort_descending(size_t* array, int len) {
3267 for (int i = 0; i < len; i++) {
3268 size_t val = array[i];
3269 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3270 size_t tmp = array[key];
3271 array[key] = array[key - 1];
3272 array[key - 1] = tmp;
3273 }
3274 }
3275 }
3277 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
3278 getpagesizes_func_type getpagesizes_func =
3279 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes"));
3280 if (getpagesizes_func == NULL) {
3281 if (warn) {
3282 warning("MPSS is not supported by the operating system.");
3283 }
3284 return false;
3285 }
3287 const unsigned int usable_count = VM_Version::page_size_count();
3288 if (usable_count == 1) {
3289 return false;
3290 }
3292 // Fill the array of page sizes.
3293 int n = getpagesizes_func(_page_sizes, page_sizes_max);
3294 assert(n > 0, "Solaris bug?");
3295 if (n == page_sizes_max) {
3296 // Add a sentinel value (necessary only if the array was completely filled
3297 // since it is static (zeroed at initialization)).
3298 _page_sizes[--n] = 0;
3299 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3300 }
3301 assert(_page_sizes[n] == 0, "missing sentinel");
3303 if (n == 1) return false; // Only one page size available.
3305 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3306 // select up to usable_count elements. First sort the array, find the first
3307 // acceptable value, then copy the usable sizes to the top of the array and
3308 // trim the rest. Make sure to include the default page size :-).
3309 //
3310 // A better policy could get rid of the 4M limit by taking the sizes of the
3311 // important VM memory regions (java heap and possibly the code cache) into
3312 // account.
3313 insertion_sort_descending(_page_sizes, n);
3314 const size_t size_limit =
3315 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3316 int beg;
3317 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3318 const int end = MIN2((int)usable_count, n) - 1;
3319 for (int cur = 0; cur < end; ++cur, ++beg) {
3320 _page_sizes[cur] = _page_sizes[beg];
3321 }
3322 _page_sizes[end] = vm_page_size();
3323 _page_sizes[end + 1] = 0;
3325 if (_page_sizes[end] > _page_sizes[end - 1]) {
3326 // Default page size is not the smallest; sort again.
3327 insertion_sort_descending(_page_sizes, end + 1);
3328 }
3329 *page_size = _page_sizes[0];
3331 return true;
3332 }
3334 bool os::large_page_init() {
3335 if (!UseLargePages) {
3336 UseISM = false;
3337 UseMPSS = false;
3338 return false;
3339 }
3341 // print a warning if any large page related flag is specified on command line
3342 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3343 !FLAG_IS_DEFAULT(UseISM) ||
3344 !FLAG_IS_DEFAULT(UseMPSS) ||
3345 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3346 UseISM = UseISM &&
3347 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size);
3348 if (UseISM) {
3349 // ISM disables MPSS to be compatible with old JDK behavior
3350 UseMPSS = false;
3351 _page_sizes[0] = _large_page_size;
3352 _page_sizes[1] = vm_page_size();
3353 }
3355 UseMPSS = UseMPSS &&
3356 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3358 UseLargePages = UseISM || UseMPSS;
3359 return UseLargePages;
3360 }
3362 bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
3363 // Signal to OS that we want large pages for addresses
3364 // from addr, addr + bytes
3365 struct memcntl_mha mpss_struct;
3366 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3367 mpss_struct.mha_pagesize = align;
3368 mpss_struct.mha_flags = 0;
3369 if (memcntl(start, bytes, MC_HAT_ADVISE,
3370 (caddr_t) &mpss_struct, 0, 0) < 0) {
3371 debug_only(warning("Attempt to use MPSS failed."));
3372 return false;
3373 }
3374 return true;
3375 }
3377 char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
3378 // "exec" is passed in but not used. Creating the shared image for
3379 // the code cache doesn't have an SHM_X executable permission to check.
3380 assert(UseLargePages && UseISM, "only for ISM large pages");
3382 size_t size = bytes;
3383 char* retAddr = NULL;
3384 int shmid;
3385 key_t ismKey;
3387 bool warn_on_failure = UseISM &&
3388 (!FLAG_IS_DEFAULT(UseLargePages) ||
3389 !FLAG_IS_DEFAULT(UseISM) ||
3390 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
3391 );
3392 char msg[128];
3394 ismKey = IPC_PRIVATE;
3396 // Create a large shared memory region to attach to based on size.
3397 // Currently, size is the total size of the heap
3398 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT);
3399 if (shmid == -1){
3400 if (warn_on_failure) {
3401 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
3402 warning(msg);
3403 }
3404 return NULL;
3405 }
3407 // Attach to the region
3408 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W);
3409 int err = errno;
3411 // Remove shmid. If shmat() is successful, the actual shared memory segment
3412 // will be deleted when it's detached by shmdt() or when the process
3413 // terminates. If shmat() is not successful this will remove the shared
3414 // segment immediately.
3415 shmctl(shmid, IPC_RMID, NULL);
3417 if (retAddr == (char *) -1) {
3418 if (warn_on_failure) {
3419 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
3420 warning(msg);
3421 }
3422 return NULL;
3423 }
3425 return retAddr;
3426 }
3428 bool os::release_memory_special(char* base, size_t bytes) {
3429 // detaching the SHM segment will also delete it, see reserve_memory_special()
3430 int rslt = shmdt(base);
3431 return rslt == 0;
3432 }
3434 size_t os::large_page_size() {
3435 return _large_page_size;
3436 }
3438 // MPSS allows application to commit large page memory on demand; with ISM
3439 // the entire memory region must be allocated as shared memory.
3440 bool os::can_commit_large_page_memory() {
3441 return UseISM ? false : true;
3442 }
3444 bool os::can_execute_large_page_memory() {
3445 return UseISM ? false : true;
3446 }
3448 static int os_sleep(jlong millis, bool interruptible) {
3449 const jlong limit = INT_MAX;
3450 jlong prevtime;
3451 int res;
3453 while (millis > limit) {
3454 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3455 return res;
3456 millis -= limit;
3457 }
3459 // Restart interrupted polls with new parameters until the proper delay
3460 // has been completed.
3462 prevtime = getTimeMillis();
3464 while (millis > 0) {
3465 jlong newtime;
3467 if (!interruptible) {
3468 // Following assert fails for os::yield_all:
3469 // assert(!thread->is_Java_thread(), "must not be java thread");
3470 res = poll(NULL, 0, millis);
3471 } else {
3472 JavaThread *jt = JavaThread::current();
3474 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3475 os::Solaris::clear_interrupted);
3476 }
3478 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3479 // thread.Interrupt.
3481 // See c/r 6751923. Poll can return 0 before time
3482 // has elapsed if time is set via clock_settime (as NTP does).
3483 // res == 0 if poll timed out (see man poll RETURN VALUES)
3484 // using the logic below checks that we really did
3485 // sleep at least "millis" if not we'll sleep again.
3486 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3487 newtime = getTimeMillis();
3488 assert(newtime >= prevtime, "time moving backwards");
3489 /* Doing prevtime and newtime in microseconds doesn't help precision,
3490 and trying to round up to avoid lost milliseconds can result in a
3491 too-short delay. */
3492 millis -= newtime - prevtime;
3493 if(millis <= 0)
3494 return OS_OK;
3495 prevtime = newtime;
3496 } else
3497 return res;
3498 }
3500 return OS_OK;
3501 }
3503 // Read calls from inside the vm need to perform state transitions
3504 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3505 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3506 }
3508 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3509 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3510 }
3512 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3513 assert(thread == Thread::current(), "thread consistency check");
3515 // TODO-FIXME: this should be removed.
3516 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3517 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3518 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3519 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3520 // is fooled into believing that the system is making progress. In the code below we block the
3521 // the watcher thread while safepoint is in progress so that it would not appear as though the
3522 // system is making progress.
3523 if (!Solaris::T2_libthread() &&
3524 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3525 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3526 // the entire safepoint, the watcher thread will line up here during the safepoint.
3527 Threads_lock->lock_without_safepoint_check();
3528 Threads_lock->unlock();
3529 }
3531 if (thread->is_Java_thread()) {
3532 // This is a JavaThread so we honor the _thread_blocked protocol
3533 // even for sleeps of 0 milliseconds. This was originally done
3534 // as a workaround for bug 4338139. However, now we also do it
3535 // to honor the suspend-equivalent protocol.
3537 JavaThread *jt = (JavaThread *) thread;
3538 ThreadBlockInVM tbivm(jt);
3540 jt->set_suspend_equivalent();
3541 // cleared by handle_special_suspend_equivalent_condition() or
3542 // java_suspend_self() via check_and_wait_while_suspended()
3544 int ret_code;
3545 if (millis <= 0) {
3546 thr_yield();
3547 ret_code = 0;
3548 } else {
3549 // The original sleep() implementation did not create an
3550 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3551 // I'm preserving that decision for now.
3552 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3554 ret_code = os_sleep(millis, interruptible);
3555 }
3557 // were we externally suspended while we were waiting?
3558 jt->check_and_wait_while_suspended();
3560 return ret_code;
3561 }
3563 // non-JavaThread from this point on:
3565 if (millis <= 0) {
3566 thr_yield();
3567 return 0;
3568 }
3570 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3572 return os_sleep(millis, interruptible);
3573 }
3575 int os::naked_sleep() {
3576 // %% make the sleep time an integer flag. for now use 1 millisec.
3577 return os_sleep(1, false);
3578 }
3580 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3581 void os::infinite_sleep() {
3582 while (true) { // sleep forever ...
3583 ::sleep(100); // ... 100 seconds at a time
3584 }
3585 }
3587 // Used to convert frequent JVM_Yield() to nops
3588 bool os::dont_yield() {
3589 if (DontYieldALot) {
3590 static hrtime_t last_time = 0;
3591 hrtime_t diff = getTimeNanos() - last_time;
3593 if (diff < DontYieldALotInterval * 1000000)
3594 return true;
3596 last_time += diff;
3598 return false;
3599 }
3600 else {
3601 return false;
3602 }
3603 }
3605 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3606 // the linux and win32 implementations do not. This should be checked.
3608 void os::yield() {
3609 // Yields to all threads with same or greater priority
3610 os::sleep(Thread::current(), 0, false);
3611 }
3613 // Note that yield semantics are defined by the scheduling class to which
3614 // the thread currently belongs. Typically, yield will _not yield to
3615 // other equal or higher priority threads that reside on the dispatch queues
3616 // of other CPUs.
3618 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3621 // On Solaris we found that yield_all doesn't always yield to all other threads.
3622 // There have been cases where there is a thread ready to execute but it doesn't
3623 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3624 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3625 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3626 // number of times yield_all is called in the one loop and increase the sleep
3627 // time after 8 attempts. If this fails too we increase the concurrency level
3628 // so that the starving thread would get an lwp
3630 void os::yield_all(int attempts) {
3631 // Yields to all threads, including threads with lower priorities
3632 if (attempts == 0) {
3633 os::sleep(Thread::current(), 1, false);
3634 } else {
3635 int iterations = attempts % 30;
3636 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3637 // thr_setconcurrency and _getconcurrency make sense only under T1.
3638 int noofLWPS = thr_getconcurrency();
3639 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3640 thr_setconcurrency(thr_getconcurrency() + 1);
3641 }
3642 } else if (iterations < 25) {
3643 os::sleep(Thread::current(), 1, false);
3644 } else {
3645 os::sleep(Thread::current(), 10, false);
3646 }
3647 }
3648 }
3650 // Called from the tight loops to possibly influence time-sharing heuristics
3651 void os::loop_breaker(int attempts) {
3652 os::yield_all(attempts);
3653 }
3656 // Interface for setting lwp priorities. If we are using T2 libthread,
3657 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3658 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3659 // function is meaningless in this mode so we must adjust the real lwp's priority
3660 // The routines below implement the getting and setting of lwp priorities.
3661 //
3662 // Note: There are three priority scales used on Solaris. Java priotities
3663 // which range from 1 to 10, libthread "thr_setprio" scale which range
3664 // from 0 to 127, and the current scheduling class of the process we
3665 // are running in. This is typically from -60 to +60.
3666 // The setting of the lwp priorities in done after a call to thr_setprio
3667 // so Java priorities are mapped to libthread priorities and we map from
3668 // the latter to lwp priorities. We don't keep priorities stored in
3669 // Java priorities since some of our worker threads want to set priorities
3670 // higher than all Java threads.
3671 //
3672 // For related information:
3673 // (1) man -s 2 priocntl
3674 // (2) man -s 4 priocntl
3675 // (3) man dispadmin
3676 // = librt.so
3677 // = libthread/common/rtsched.c - thrp_setlwpprio().
3678 // = ps -cL <pid> ... to validate priority.
3679 // = sched_get_priority_min and _max
3680 // pthread_create
3681 // sched_setparam
3682 // pthread_setschedparam
3683 //
3684 // Assumptions:
3685 // + We assume that all threads in the process belong to the same
3686 // scheduling class. IE. an homogenous process.
3687 // + Must be root or in IA group to change change "interactive" attribute.
3688 // Priocntl() will fail silently. The only indication of failure is when
3689 // we read-back the value and notice that it hasn't changed.
3690 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3691 // + For RT, change timeslice as well. Invariant:
3692 // constant "priority integral"
3693 // Konst == TimeSlice * (60-Priority)
3694 // Given a priority, compute appropriate timeslice.
3695 // + Higher numerical values have higher priority.
3697 // sched class attributes
3698 typedef struct {
3699 int schedPolicy; // classID
3700 int maxPrio;
3701 int minPrio;
3702 } SchedInfo;
3705 static SchedInfo tsLimits, iaLimits, rtLimits;
3707 #ifdef ASSERT
3708 static int ReadBackValidate = 1;
3709 #endif
3710 static int myClass = 0;
3711 static int myMin = 0;
3712 static int myMax = 0;
3713 static int myCur = 0;
3714 static bool priocntl_enable = false;
3717 // Call the version of priocntl suitable for all supported versions
3718 // of Solaris. We need to call through this wrapper so that we can
3719 // build on Solaris 9 and run on Solaris 8, 9 and 10.
3720 //
3721 // This code should be removed if we ever stop supporting Solaris 8
3722 // and earlier releases.
3724 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3725 typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg);
3726 static priocntl_type priocntl_ptr = priocntl_stub;
3728 // Stub to set the value of the real pointer, and then call the real
3729 // function.
3731 static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) {
3732 // Try Solaris 8- name only.
3733 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl");
3734 guarantee(tmp != NULL, "priocntl function not found.");
3735 priocntl_ptr = tmp;
3736 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg);
3737 }
3740 // lwp_priocntl_init
3741 //
3742 // Try to determine the priority scale for our process.
3743 //
3744 // Return errno or 0 if OK.
3745 //
3746 static
3747 int lwp_priocntl_init ()
3748 {
3749 int rslt;
3750 pcinfo_t ClassInfo;
3751 pcparms_t ParmInfo;
3752 int i;
3754 if (!UseThreadPriorities) return 0;
3756 // We are using Bound threads, we need to determine our priority ranges
3757 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3758 // If ThreadPriorityPolicy is 1, switch tables
3759 if (ThreadPriorityPolicy == 1) {
3760 for (i = 0 ; i < MaxPriority+1; i++)
3761 os::java_to_os_priority[i] = prio_policy1[i];
3762 }
3763 }
3764 // Not using Bound Threads, set to ThreadPolicy 1
3765 else {
3766 for ( i = 0 ; i < MaxPriority+1; i++ ) {
3767 os::java_to_os_priority[i] = prio_policy1[i];
3768 }
3769 return 0;
3770 }
3773 // Get IDs for a set of well-known scheduling classes.
3774 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3775 // the system. We should have a loop that iterates over the
3776 // classID values, which are known to be "small" integers.
3778 strcpy(ClassInfo.pc_clname, "TS");
3779 ClassInfo.pc_cid = -1;
3780 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3781 if (rslt < 0) return errno;
3782 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3783 tsLimits.schedPolicy = ClassInfo.pc_cid;
3784 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3785 tsLimits.minPrio = -tsLimits.maxPrio;
3787 strcpy(ClassInfo.pc_clname, "IA");
3788 ClassInfo.pc_cid = -1;
3789 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3790 if (rslt < 0) return errno;
3791 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3792 iaLimits.schedPolicy = ClassInfo.pc_cid;
3793 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3794 iaLimits.minPrio = -iaLimits.maxPrio;
3796 strcpy(ClassInfo.pc_clname, "RT");
3797 ClassInfo.pc_cid = -1;
3798 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3799 if (rslt < 0) return errno;
3800 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3801 rtLimits.schedPolicy = ClassInfo.pc_cid;
3802 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3803 rtLimits.minPrio = 0;
3806 // Query our "current" scheduling class.
3807 // This will normally be IA,TS or, rarely, RT.
3808 memset (&ParmInfo, 0, sizeof(ParmInfo));
3809 ParmInfo.pc_cid = PC_CLNULL;
3810 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo );
3811 if ( rslt < 0 ) return errno;
3812 myClass = ParmInfo.pc_cid;
3814 // We now know our scheduling classId, get specific information
3815 // the class.
3816 ClassInfo.pc_cid = myClass;
3817 ClassInfo.pc_clname[0] = 0;
3818 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo );
3819 if ( rslt < 0 ) return errno;
3821 if (ThreadPriorityVerbose)
3822 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3824 memset(&ParmInfo, 0, sizeof(pcparms_t));
3825 ParmInfo.pc_cid = PC_CLNULL;
3826 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3827 if (rslt < 0) return errno;
3829 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3830 myMin = rtLimits.minPrio;
3831 myMax = rtLimits.maxPrio;
3832 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3833 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3834 myMin = iaLimits.minPrio;
3835 myMax = iaLimits.maxPrio;
3836 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3837 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3838 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3839 myMin = tsLimits.minPrio;
3840 myMax = tsLimits.maxPrio;
3841 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3842 } else {
3843 // No clue - punt
3844 if (ThreadPriorityVerbose)
3845 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3846 return EINVAL; // no clue, punt
3847 }
3849 if (ThreadPriorityVerbose)
3850 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3852 priocntl_enable = true; // Enable changing priorities
3853 return 0;
3854 }
3856 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3857 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3858 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3861 // scale_to_lwp_priority
3862 //
3863 // Convert from the libthread "thr_setprio" scale to our current
3864 // lwp scheduling class scale.
3865 //
3866 static
3867 int scale_to_lwp_priority (int rMin, int rMax, int x)
3868 {
3869 int v;
3871 if (x == 127) return rMax; // avoid round-down
3872 v = (((x*(rMax-rMin)))/128)+rMin;
3873 return v;
3874 }
3877 // set_lwp_priority
3878 //
3879 // Set the priority of the lwp. This call should only be made
3880 // when using bound threads (T2 threads are bound by default).
3881 //
3882 int set_lwp_priority (int ThreadID, int lwpid, int newPrio )
3883 {
3884 int rslt;
3885 int Actual, Expected, prv;
3886 pcparms_t ParmInfo; // for GET-SET
3887 #ifdef ASSERT
3888 pcparms_t ReadBack; // for readback
3889 #endif
3891 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3892 // Query current values.
3893 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3894 // Cache "pcparms_t" in global ParmCache.
3895 // TODO: elide set-to-same-value
3897 // If something went wrong on init, don't change priorities.
3898 if ( !priocntl_enable ) {
3899 if (ThreadPriorityVerbose)
3900 tty->print_cr("Trying to set priority but init failed, ignoring");
3901 return EINVAL;
3902 }
3905 // If lwp hasn't started yet, just return
3906 // the _start routine will call us again.
3907 if ( lwpid <= 0 ) {
3908 if (ThreadPriorityVerbose) {
3909 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set",
3910 ThreadID, newPrio);
3911 }
3912 return 0;
3913 }
3915 if (ThreadPriorityVerbose) {
3916 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3917 ThreadID, lwpid, newPrio);
3918 }
3920 memset(&ParmInfo, 0, sizeof(pcparms_t));
3921 ParmInfo.pc_cid = PC_CLNULL;
3922 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3923 if (rslt < 0) return errno;
3925 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3926 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3927 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio);
3928 rtInfo->rt_tqsecs = RT_NOCHANGE;
3929 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3930 if (ThreadPriorityVerbose) {
3931 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3932 }
3933 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3934 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3935 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim);
3936 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio);
3937 iaInfo->ia_uprilim = IA_NOCHANGE;
3938 iaInfo->ia_mode = IA_NOCHANGE;
3939 if (ThreadPriorityVerbose) {
3940 tty->print_cr ("IA: [%d...%d] %d->%d\n",
3941 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3942 }
3943 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3944 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3945 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim);
3946 prv = tsInfo->ts_upri;
3947 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio);
3948 tsInfo->ts_uprilim = IA_NOCHANGE;
3949 if (ThreadPriorityVerbose) {
3950 tty->print_cr ("TS: %d [%d...%d] %d->%d\n",
3951 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3952 }
3953 if (prv == tsInfo->ts_upri) return 0;
3954 } else {
3955 if ( ThreadPriorityVerbose ) {
3956 tty->print_cr ("Unknown scheduling class\n");
3957 }
3958 return EINVAL; // no clue, punt
3959 }
3961 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3962 if (ThreadPriorityVerbose && rslt) {
3963 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3964 }
3965 if (rslt < 0) return errno;
3967 #ifdef ASSERT
3968 // Sanity check: read back what we just attempted to set.
3969 // In theory it could have changed in the interim ...
3970 //
3971 // The priocntl system call is tricky.
3972 // Sometimes it'll validate the priority value argument and
3973 // return EINVAL if unhappy. At other times it fails silently.
3974 // Readbacks are prudent.
3976 if (!ReadBackValidate) return 0;
3978 memset(&ReadBack, 0, sizeof(pcparms_t));
3979 ReadBack.pc_cid = PC_CLNULL;
3980 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3981 assert(rslt >= 0, "priocntl failed");
3982 Actual = Expected = 0xBAD;
3983 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3984 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3985 Actual = RTPRI(ReadBack)->rt_pri;
3986 Expected = RTPRI(ParmInfo)->rt_pri;
3987 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3988 Actual = IAPRI(ReadBack)->ia_upri;
3989 Expected = IAPRI(ParmInfo)->ia_upri;
3990 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3991 Actual = TSPRI(ReadBack)->ts_upri;
3992 Expected = TSPRI(ParmInfo)->ts_upri;
3993 } else {
3994 if ( ThreadPriorityVerbose ) {
3995 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid);
3996 }
3997 }
3999 if (Actual != Expected) {
4000 if ( ThreadPriorityVerbose ) {
4001 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
4002 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
4003 }
4004 }
4005 #endif
4007 return 0;
4008 }
4012 // Solaris only gives access to 128 real priorities at a time,
4013 // so we expand Java's ten to fill this range. This would be better
4014 // if we dynamically adjusted relative priorities.
4015 //
4016 // The ThreadPriorityPolicy option allows us to select 2 different
4017 // priority scales.
4018 //
4019 // ThreadPriorityPolicy=0
4020 // Since the Solaris' default priority is MaximumPriority, we do not
4021 // set a priority lower than Max unless a priority lower than
4022 // NormPriority is requested.
4023 //
4024 // ThreadPriorityPolicy=1
4025 // This mode causes the priority table to get filled with
4026 // linear values. NormPriority get's mapped to 50% of the
4027 // Maximum priority an so on. This will cause VM threads
4028 // to get unfair treatment against other Solaris processes
4029 // which do not explicitly alter their thread priorities.
4030 //
4033 int os::java_to_os_priority[MaxPriority + 1] = {
4034 -99999, // 0 Entry should never be used
4036 0, // 1 MinPriority
4037 32, // 2
4038 64, // 3
4040 96, // 4
4041 127, // 5 NormPriority
4042 127, // 6
4044 127, // 7
4045 127, // 8
4046 127, // 9 NearMaxPriority
4048 127 // 10 MaxPriority
4049 };
4052 OSReturn os::set_native_priority(Thread* thread, int newpri) {
4053 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
4054 if ( !UseThreadPriorities ) return OS_OK;
4055 int status = thr_setprio(thread->osthread()->thread_id(), newpri);
4056 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) )
4057 status |= (set_lwp_priority (thread->osthread()->thread_id(),
4058 thread->osthread()->lwp_id(), newpri ));
4059 return (status == 0) ? OS_OK : OS_ERR;
4060 }
4063 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
4064 int p;
4065 if ( !UseThreadPriorities ) {
4066 *priority_ptr = NormalPriority;
4067 return OS_OK;
4068 }
4069 int status = thr_getprio(thread->osthread()->thread_id(), &p);
4070 if (status != 0) {
4071 return OS_ERR;
4072 }
4073 *priority_ptr = p;
4074 return OS_OK;
4075 }
4078 // Hint to the underlying OS that a task switch would not be good.
4079 // Void return because it's a hint and can fail.
4080 void os::hint_no_preempt() {
4081 schedctl_start(schedctl_init());
4082 }
4084 void os::interrupt(Thread* thread) {
4085 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4087 OSThread* osthread = thread->osthread();
4089 int isInterrupted = osthread->interrupted();
4090 if (!isInterrupted) {
4091 osthread->set_interrupted(true);
4092 OrderAccess::fence();
4093 // os::sleep() is implemented with either poll (NULL,0,timeout) or
4094 // by parking on _SleepEvent. If the former, thr_kill will unwedge
4095 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
4096 ParkEvent * const slp = thread->_SleepEvent ;
4097 if (slp != NULL) slp->unpark() ;
4098 }
4100 // For JSR166: unpark after setting status but before thr_kill -dl
4101 if (thread->is_Java_thread()) {
4102 ((JavaThread*)thread)->parker()->unpark();
4103 }
4105 // Handle interruptible wait() ...
4106 ParkEvent * const ev = thread->_ParkEvent ;
4107 if (ev != NULL) ev->unpark() ;
4109 // When events are used everywhere for os::sleep, then this thr_kill
4110 // will only be needed if UseVMInterruptibleIO is true.
4112 if (!isInterrupted) {
4113 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4114 assert_status(status == 0, status, "thr_kill");
4116 // Bump thread interruption counter
4117 RuntimeService::record_thread_interrupt_signaled_count();
4118 }
4119 }
4122 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4123 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4125 OSThread* osthread = thread->osthread();
4127 bool res = osthread->interrupted();
4129 // NOTE that since there is no "lock" around these two operations,
4130 // there is the possibility that the interrupted flag will be
4131 // "false" but that the interrupt event will be set. This is
4132 // intentional. The effect of this is that Object.wait() will appear
4133 // to have a spurious wakeup, which is not harmful, and the
4134 // possibility is so rare that it is not worth the added complexity
4135 // to add yet another lock. It has also been recommended not to put
4136 // the interrupted flag into the os::Solaris::Event structure,
4137 // because it hides the issue.
4138 if (res && clear_interrupted) {
4139 osthread->set_interrupted(false);
4140 }
4141 return res;
4142 }
4145 void os::print_statistics() {
4146 }
4148 int os::message_box(const char* title, const char* message) {
4149 int i;
4150 fdStream err(defaultStream::error_fd());
4151 for (i = 0; i < 78; i++) err.print_raw("=");
4152 err.cr();
4153 err.print_raw_cr(title);
4154 for (i = 0; i < 78; i++) err.print_raw("-");
4155 err.cr();
4156 err.print_raw_cr(message);
4157 for (i = 0; i < 78; i++) err.print_raw("=");
4158 err.cr();
4160 char buf[16];
4161 // Prevent process from exiting upon "read error" without consuming all CPU
4162 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4164 return buf[0] == 'y' || buf[0] == 'Y';
4165 }
4167 // A lightweight implementation that does not suspend the target thread and
4168 // thus returns only a hint. Used for profiling only!
4169 ExtendedPC os::get_thread_pc(Thread* thread) {
4170 // Make sure that it is called by the watcher and the Threads lock is owned.
4171 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4172 // For now, is only used to profile the VM Thread
4173 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4174 ExtendedPC epc;
4176 GetThreadPC_Callback cb(ProfileVM_lock);
4177 OSThread *osthread = thread->osthread();
4178 const int time_to_wait = 400; // 400ms wait for initial response
4179 int status = cb.interrupt(thread, time_to_wait);
4181 if (cb.is_done() ) {
4182 epc = cb.addr();
4183 } else {
4184 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status",
4185 osthread->thread_id(), status););
4186 // epc is already NULL
4187 }
4188 return epc;
4189 }
4192 // This does not do anything on Solaris. This is basically a hook for being
4193 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4194 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4195 f(value, method, args, thread);
4196 }
4198 // This routine may be used by user applications as a "hook" to catch signals.
4199 // The user-defined signal handler must pass unrecognized signals to this
4200 // routine, and if it returns true (non-zero), then the signal handler must
4201 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4202 // routine will never retun false (zero), but instead will execute a VM panic
4203 // routine kill the process.
4204 //
4205 // If this routine returns false, it is OK to call it again. This allows
4206 // the user-defined signal handler to perform checks either before or after
4207 // the VM performs its own checks. Naturally, the user code would be making
4208 // a serious error if it tried to handle an exception (such as a null check
4209 // or breakpoint) that the VM was generating for its own correct operation.
4210 //
4211 // This routine may recognize any of the following kinds of signals:
4212 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4213 // os::Solaris::SIGasync
4214 // It should be consulted by handlers for any of those signals.
4215 // It explicitly does not recognize os::Solaris::SIGinterrupt
4216 //
4217 // The caller of this routine must pass in the three arguments supplied
4218 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4219 // field of the structure passed to sigaction(). This routine assumes that
4220 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4221 //
4222 // Note that the VM will print warnings if it detects conflicting signal
4223 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4224 //
4225 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
4228 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4229 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4230 }
4232 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4233 is needed to provoke threads blocked on IO to return an EINTR
4234 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4235 does NOT participate in signal chaining due to requirement for
4236 NOT setting SA_RESTART to make EINTR work. */
4237 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4238 if (UseSignalChaining) {
4239 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4240 if (actp && actp->sa_handler) {
4241 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4242 }
4243 }
4244 }
4246 // This boolean allows users to forward their own non-matching signals
4247 // to JVM_handle_solaris_signal, harmlessly.
4248 bool os::Solaris::signal_handlers_are_installed = false;
4250 // For signal-chaining
4251 bool os::Solaris::libjsig_is_loaded = false;
4252 typedef struct sigaction *(*get_signal_t)(int);
4253 get_signal_t os::Solaris::get_signal_action = NULL;
4255 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4256 struct sigaction *actp = NULL;
4258 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4259 // Retrieve the old signal handler from libjsig
4260 actp = (*get_signal_action)(sig);
4261 }
4262 if (actp == NULL) {
4263 // Retrieve the preinstalled signal handler from jvm
4264 actp = get_preinstalled_handler(sig);
4265 }
4267 return actp;
4268 }
4270 static bool call_chained_handler(struct sigaction *actp, int sig,
4271 siginfo_t *siginfo, void *context) {
4272 // Call the old signal handler
4273 if (actp->sa_handler == SIG_DFL) {
4274 // It's more reasonable to let jvm treat it as an unexpected exception
4275 // instead of taking the default action.
4276 return false;
4277 } else if (actp->sa_handler != SIG_IGN) {
4278 if ((actp->sa_flags & SA_NODEFER) == 0) {
4279 // automaticlly block the signal
4280 sigaddset(&(actp->sa_mask), sig);
4281 }
4283 sa_handler_t hand;
4284 sa_sigaction_t sa;
4285 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4286 // retrieve the chained handler
4287 if (siginfo_flag_set) {
4288 sa = actp->sa_sigaction;
4289 } else {
4290 hand = actp->sa_handler;
4291 }
4293 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4294 actp->sa_handler = SIG_DFL;
4295 }
4297 // try to honor the signal mask
4298 sigset_t oset;
4299 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4301 // call into the chained handler
4302 if (siginfo_flag_set) {
4303 (*sa)(sig, siginfo, context);
4304 } else {
4305 (*hand)(sig);
4306 }
4308 // restore the signal mask
4309 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4310 }
4311 // Tell jvm's signal handler the signal is taken care of.
4312 return true;
4313 }
4315 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4316 bool chained = false;
4317 // signal-chaining
4318 if (UseSignalChaining) {
4319 struct sigaction *actp = get_chained_signal_action(sig);
4320 if (actp != NULL) {
4321 chained = call_chained_handler(actp, sig, siginfo, context);
4322 }
4323 }
4324 return chained;
4325 }
4327 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4328 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4329 if (preinstalled_sigs[sig] != 0) {
4330 return &chainedsigactions[sig];
4331 }
4332 return NULL;
4333 }
4335 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4337 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4338 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4339 chainedsigactions[sig] = oldAct;
4340 preinstalled_sigs[sig] = 1;
4341 }
4343 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4344 // Check for overwrite.
4345 struct sigaction oldAct;
4346 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4347 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4348 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4349 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4350 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4351 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4352 if (AllowUserSignalHandlers || !set_installed) {
4353 // Do not overwrite; user takes responsibility to forward to us.
4354 return;
4355 } else if (UseSignalChaining) {
4356 if (oktochain) {
4357 // save the old handler in jvm
4358 save_preinstalled_handler(sig, oldAct);
4359 } else {
4360 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4361 }
4362 // libjsig also interposes the sigaction() call below and saves the
4363 // old sigaction on it own.
4364 } else {
4365 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4366 "%#lx for signal %d.", (long)oldhand, sig));
4367 }
4368 }
4370 struct sigaction sigAct;
4371 sigfillset(&(sigAct.sa_mask));
4372 sigAct.sa_handler = SIG_DFL;
4374 sigAct.sa_sigaction = signalHandler;
4375 // Handle SIGSEGV on alternate signal stack if
4376 // not using stack banging
4377 if (!UseStackBanging && sig == SIGSEGV) {
4378 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4379 // Interruptible i/o requires SA_RESTART cleared so EINTR
4380 // is returned instead of restarting system calls
4381 } else if (sig == os::Solaris::SIGinterrupt()) {
4382 sigemptyset(&sigAct.sa_mask);
4383 sigAct.sa_handler = NULL;
4384 sigAct.sa_flags = SA_SIGINFO;
4385 sigAct.sa_sigaction = sigINTRHandler;
4386 } else {
4387 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4388 }
4389 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4391 sigaction(sig, &sigAct, &oldAct);
4393 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4394 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4395 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4396 }
4399 #define DO_SIGNAL_CHECK(sig) \
4400 if (!sigismember(&check_signal_done, sig)) \
4401 os::Solaris::check_signal_handler(sig)
4403 // This method is a periodic task to check for misbehaving JNI applications
4404 // under CheckJNI, we can add any periodic checks here
4406 void os::run_periodic_checks() {
4407 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4408 // thereby preventing a NULL checks.
4409 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4411 if (check_signals == false) return;
4413 // SEGV and BUS if overridden could potentially prevent
4414 // generation of hs*.log in the event of a crash, debugging
4415 // such a case can be very challenging, so we absolutely
4416 // check for the following for a good measure:
4417 DO_SIGNAL_CHECK(SIGSEGV);
4418 DO_SIGNAL_CHECK(SIGILL);
4419 DO_SIGNAL_CHECK(SIGFPE);
4420 DO_SIGNAL_CHECK(SIGBUS);
4421 DO_SIGNAL_CHECK(SIGPIPE);
4422 DO_SIGNAL_CHECK(SIGXFSZ);
4424 // ReduceSignalUsage allows the user to override these handlers
4425 // see comments at the very top and jvm_solaris.h
4426 if (!ReduceSignalUsage) {
4427 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4428 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4429 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4430 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4431 }
4433 // See comments above for using JVM1/JVM2 and UseAltSigs
4434 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4435 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4437 }
4439 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4441 static os_sigaction_t os_sigaction = NULL;
4443 void os::Solaris::check_signal_handler(int sig) {
4444 char buf[O_BUFLEN];
4445 address jvmHandler = NULL;
4447 struct sigaction act;
4448 if (os_sigaction == NULL) {
4449 // only trust the default sigaction, in case it has been interposed
4450 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4451 if (os_sigaction == NULL) return;
4452 }
4454 os_sigaction(sig, (struct sigaction*)NULL, &act);
4456 address thisHandler = (act.sa_flags & SA_SIGINFO)
4457 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4458 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4461 switch(sig) {
4462 case SIGSEGV:
4463 case SIGBUS:
4464 case SIGFPE:
4465 case SIGPIPE:
4466 case SIGXFSZ:
4467 case SIGILL:
4468 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4469 break;
4471 case SHUTDOWN1_SIGNAL:
4472 case SHUTDOWN2_SIGNAL:
4473 case SHUTDOWN3_SIGNAL:
4474 case BREAK_SIGNAL:
4475 jvmHandler = (address)user_handler();
4476 break;
4478 default:
4479 int intrsig = os::Solaris::SIGinterrupt();
4480 int asynsig = os::Solaris::SIGasync();
4482 if (sig == intrsig) {
4483 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4484 } else if (sig == asynsig) {
4485 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4486 } else {
4487 return;
4488 }
4489 break;
4490 }
4493 if (thisHandler != jvmHandler) {
4494 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4495 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4496 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4497 // No need to check this sig any longer
4498 sigaddset(&check_signal_done, sig);
4499 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4500 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4501 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4502 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4503 // No need to check this sig any longer
4504 sigaddset(&check_signal_done, sig);
4505 }
4507 // Print all the signal handler state
4508 if (sigismember(&check_signal_done, sig)) {
4509 print_signal_handlers(tty, buf, O_BUFLEN);
4510 }
4512 }
4514 void os::Solaris::install_signal_handlers() {
4515 bool libjsigdone = false;
4516 signal_handlers_are_installed = true;
4518 // signal-chaining
4519 typedef void (*signal_setting_t)();
4520 signal_setting_t begin_signal_setting = NULL;
4521 signal_setting_t end_signal_setting = NULL;
4522 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4523 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4524 if (begin_signal_setting != NULL) {
4525 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4526 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4527 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4528 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4529 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4530 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4531 libjsig_is_loaded = true;
4532 if (os::Solaris::get_libjsig_version != NULL) {
4533 libjsigversion = (*os::Solaris::get_libjsig_version)();
4534 }
4535 assert(UseSignalChaining, "should enable signal-chaining");
4536 }
4537 if (libjsig_is_loaded) {
4538 // Tell libjsig jvm is setting signal handlers
4539 (*begin_signal_setting)();
4540 }
4542 set_signal_handler(SIGSEGV, true, true);
4543 set_signal_handler(SIGPIPE, true, true);
4544 set_signal_handler(SIGXFSZ, true, true);
4545 set_signal_handler(SIGBUS, true, true);
4546 set_signal_handler(SIGILL, true, true);
4547 set_signal_handler(SIGFPE, true, true);
4550 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4552 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4553 // can not register overridable signals which might be > 32
4554 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4555 // Tell libjsig jvm has finished setting signal handlers
4556 (*end_signal_setting)();
4557 libjsigdone = true;
4558 }
4559 }
4561 // Never ok to chain our SIGinterrupt
4562 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4563 set_signal_handler(os::Solaris::SIGasync(), true, true);
4565 if (libjsig_is_loaded && !libjsigdone) {
4566 // Tell libjsig jvm finishes setting signal handlers
4567 (*end_signal_setting)();
4568 }
4570 // We don't activate signal checker if libjsig is in place, we trust ourselves
4571 // and if UserSignalHandler is installed all bets are off
4572 if (CheckJNICalls) {
4573 if (libjsig_is_loaded) {
4574 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4575 check_signals = false;
4576 }
4577 if (AllowUserSignalHandlers) {
4578 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4579 check_signals = false;
4580 }
4581 }
4582 }
4585 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4587 const char * signames[] = {
4588 "SIG0",
4589 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4590 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4591 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4592 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4593 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4594 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4595 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4596 "SIGCANCEL", "SIGLOST"
4597 };
4599 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4600 if (0 < exception_code && exception_code <= SIGRTMAX) {
4601 // signal
4602 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4603 jio_snprintf(buf, size, "%s", signames[exception_code]);
4604 } else {
4605 jio_snprintf(buf, size, "SIG%d", exception_code);
4606 }
4607 return buf;
4608 } else {
4609 return NULL;
4610 }
4611 }
4613 // (Static) wrappers for the new libthread API
4614 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4615 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4616 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4617 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4618 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4620 // (Static) wrapper for getisax(2) call.
4621 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4623 // (Static) wrappers for the liblgrp API
4624 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4625 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4626 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4627 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4628 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4629 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4630 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4631 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4632 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4634 // (Static) wrapper for meminfo() call.
4635 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4637 static address resolve_symbol_lazy(const char* name) {
4638 address addr = (address) dlsym(RTLD_DEFAULT, name);
4639 if(addr == NULL) {
4640 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4641 addr = (address) dlsym(RTLD_NEXT, name);
4642 }
4643 return addr;
4644 }
4646 static address resolve_symbol(const char* name) {
4647 address addr = resolve_symbol_lazy(name);
4648 if(addr == NULL) {
4649 fatal(dlerror());
4650 }
4651 return addr;
4652 }
4656 // isT2_libthread()
4657 //
4658 // Routine to determine if we are currently using the new T2 libthread.
4659 //
4660 // We determine if we are using T2 by reading /proc/self/lstatus and
4661 // looking for a thread with the ASLWP bit set. If we find this status
4662 // bit set, we must assume that we are NOT using T2. The T2 team
4663 // has approved this algorithm.
4664 //
4665 // We need to determine if we are running with the new T2 libthread
4666 // since setting native thread priorities is handled differently
4667 // when using this library. All threads created using T2 are bound
4668 // threads. Calling thr_setprio is meaningless in this case.
4669 //
4670 bool isT2_libthread() {
4671 static prheader_t * lwpArray = NULL;
4672 static int lwpSize = 0;
4673 static int lwpFile = -1;
4674 lwpstatus_t * that;
4675 char lwpName [128];
4676 bool isT2 = false;
4678 #define ADR(x) ((uintptr_t)(x))
4679 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4681 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4682 if (lwpFile < 0) {
4683 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4684 return false;
4685 }
4686 lwpSize = 16*1024;
4687 for (;;) {
4688 ::lseek64 (lwpFile, 0, SEEK_SET);
4689 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize);
4690 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4691 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4692 break;
4693 }
4694 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4695 // We got a good snapshot - now iterate over the list.
4696 int aslwpcount = 0;
4697 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4698 that = LWPINDEX(lwpArray,i);
4699 if (that->pr_flags & PR_ASLWP) {
4700 aslwpcount++;
4701 }
4702 }
4703 if (aslwpcount == 0) isT2 = true;
4704 break;
4705 }
4706 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4707 FREE_C_HEAP_ARRAY(char, lwpArray); // retry.
4708 }
4710 FREE_C_HEAP_ARRAY(char, lwpArray);
4711 ::close (lwpFile);
4712 if (ThreadPriorityVerbose) {
4713 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4714 else tty->print_cr("We are not running with a T2 libthread\n");
4715 }
4716 return isT2;
4717 }
4720 void os::Solaris::libthread_init() {
4721 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4723 // Determine if we are running with the new T2 libthread
4724 os::Solaris::set_T2_libthread(isT2_libthread());
4726 lwp_priocntl_init();
4728 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4729 if(func == NULL) {
4730 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4731 // Guarantee that this VM is running on an new enough OS (5.6 or
4732 // later) that it will have a new enough libthread.so.
4733 guarantee(func != NULL, "libthread.so is too old.");
4734 }
4736 // Initialize the new libthread getstate API wrappers
4737 func = resolve_symbol("thr_getstate");
4738 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4740 func = resolve_symbol("thr_setstate");
4741 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4743 func = resolve_symbol("thr_setmutator");
4744 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4746 func = resolve_symbol("thr_suspend_mutator");
4747 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4749 func = resolve_symbol("thr_continue_mutator");
4750 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4752 int size;
4753 void (*handler_info_func)(address *, int *);
4754 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4755 handler_info_func(&handler_start, &size);
4756 handler_end = handler_start + size;
4757 }
4760 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4761 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4762 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4763 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4764 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4765 int os::Solaris::_mutex_scope = USYNC_THREAD;
4767 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4768 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4769 int_fnP_cond_tP os::Solaris::_cond_signal;
4770 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4771 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4772 int_fnP_cond_tP os::Solaris::_cond_destroy;
4773 int os::Solaris::_cond_scope = USYNC_THREAD;
4775 void os::Solaris::synchronization_init() {
4776 if(UseLWPSynchronization) {
4777 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4778 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4779 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4780 os::Solaris::set_mutex_init(lwp_mutex_init);
4781 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4782 os::Solaris::set_mutex_scope(USYNC_THREAD);
4784 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4785 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4786 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4787 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4788 os::Solaris::set_cond_init(lwp_cond_init);
4789 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4790 os::Solaris::set_cond_scope(USYNC_THREAD);
4791 }
4792 else {
4793 os::Solaris::set_mutex_scope(USYNC_THREAD);
4794 os::Solaris::set_cond_scope(USYNC_THREAD);
4796 if(UsePthreads) {
4797 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4798 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4799 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4800 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4801 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4803 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4804 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4805 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4806 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4807 os::Solaris::set_cond_init(pthread_cond_default_init);
4808 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4809 }
4810 else {
4811 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4812 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4813 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4814 os::Solaris::set_mutex_init(::mutex_init);
4815 os::Solaris::set_mutex_destroy(::mutex_destroy);
4817 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4818 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4819 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4820 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4821 os::Solaris::set_cond_init(::cond_init);
4822 os::Solaris::set_cond_destroy(::cond_destroy);
4823 }
4824 }
4825 }
4827 bool os::Solaris::liblgrp_init() {
4828 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4829 if (handle != NULL) {
4830 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4831 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4832 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4833 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4834 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4835 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4836 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4837 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4838 dlsym(handle, "lgrp_cookie_stale")));
4840 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4841 set_lgrp_cookie(c);
4842 return true;
4843 }
4844 return false;
4845 }
4847 void os::Solaris::misc_sym_init() {
4848 address func;
4850 // getisax
4851 func = resolve_symbol_lazy("getisax");
4852 if (func != NULL) {
4853 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4854 }
4856 // meminfo
4857 func = resolve_symbol_lazy("meminfo");
4858 if (func != NULL) {
4859 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4860 }
4861 }
4863 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4864 assert(_getisax != NULL, "_getisax not set");
4865 return _getisax(array, n);
4866 }
4868 // Symbol doesn't exist in Solaris 8 pset.h
4869 #ifndef PS_MYID
4870 #define PS_MYID -3
4871 #endif
4873 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4874 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4875 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4877 void init_pset_getloadavg_ptr(void) {
4878 pset_getloadavg_ptr =
4879 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4880 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4881 warning("pset_getloadavg function not found");
4882 }
4883 }
4885 int os::Solaris::_dev_zero_fd = -1;
4887 // this is called _before_ the global arguments have been parsed
4888 void os::init(void) {
4889 _initial_pid = getpid();
4891 max_hrtime = first_hrtime = gethrtime();
4893 init_random(1234567);
4895 page_size = sysconf(_SC_PAGESIZE);
4896 if (page_size == -1)
4897 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4898 strerror(errno)));
4899 init_page_sizes((size_t) page_size);
4901 Solaris::initialize_system_info();
4903 // Initialize misc. symbols as soon as possible, so we can use them
4904 // if we need them.
4905 Solaris::misc_sym_init();
4907 int fd = ::open("/dev/zero", O_RDWR);
4908 if (fd < 0) {
4909 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4910 } else {
4911 Solaris::set_dev_zero_fd(fd);
4913 // Close on exec, child won't inherit.
4914 fcntl(fd, F_SETFD, FD_CLOEXEC);
4915 }
4917 clock_tics_per_sec = CLK_TCK;
4919 // check if dladdr1() exists; dladdr1 can provide more information than
4920 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4921 // and is available on linker patches for 5.7 and 5.8.
4922 // libdl.so must have been loaded, this call is just an entry lookup
4923 void * hdl = dlopen("libdl.so", RTLD_NOW);
4924 if (hdl)
4925 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4927 // (Solaris only) this switches to calls that actually do locking.
4928 ThreadCritical::initialize();
4930 main_thread = thr_self();
4932 // Constant minimum stack size allowed. It must be at least
4933 // the minimum of what the OS supports (thr_min_stack()), and
4934 // enough to allow the thread to get to user bytecode execution.
4935 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4936 // If the pagesize of the VM is greater than 8K determine the appropriate
4937 // number of initial guard pages. The user can change this with the
4938 // command line arguments, if needed.
4939 if (vm_page_size() > 8*K) {
4940 StackYellowPages = 1;
4941 StackRedPages = 1;
4942 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4943 }
4944 }
4946 // To install functions for atexit system call
4947 extern "C" {
4948 static void perfMemory_exit_helper() {
4949 perfMemory_exit();
4950 }
4951 }
4953 // this is called _after_ the global arguments have been parsed
4954 jint os::init_2(void) {
4955 // try to enable extended file IO ASAP, see 6431278
4956 os::Solaris::try_enable_extended_io();
4958 // Allocate a single page and mark it as readable for safepoint polling. Also
4959 // use this first mmap call to check support for MAP_ALIGN.
4960 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4961 page_size,
4962 MAP_PRIVATE | MAP_ALIGN,
4963 PROT_READ);
4964 if (polling_page == NULL) {
4965 has_map_align = false;
4966 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4967 PROT_READ);
4968 }
4970 os::set_polling_page(polling_page);
4972 #ifndef PRODUCT
4973 if( Verbose && PrintMiscellaneous )
4974 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4975 #endif
4977 if (!UseMembar) {
4978 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4979 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4980 os::set_memory_serialize_page( mem_serialize_page );
4982 #ifndef PRODUCT
4983 if(Verbose && PrintMiscellaneous)
4984 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4985 #endif
4986 }
4988 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init());
4990 // Check minimum allowable stack size for thread creation and to initialize
4991 // the java system classes, including StackOverflowError - depends on page
4992 // size. Add a page for compiler2 recursion in main thread.
4993 // Add in 2*BytesPerWord times page size to account for VM stack during
4994 // class initialization depending on 32 or 64 bit VM.
4995 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4996 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4997 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4999 size_t threadStackSizeInBytes = ThreadStackSize * K;
5000 if (threadStackSizeInBytes != 0 &&
5001 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5002 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5003 os::Solaris::min_stack_allowed/K);
5004 return JNI_ERR;
5005 }
5007 // For 64kbps there will be a 64kb page size, which makes
5008 // the usable default stack size quite a bit less. Increase the
5009 // stack for 64kb (or any > than 8kb) pages, this increases
5010 // virtual memory fragmentation (since we're not creating the
5011 // stack on a power of 2 boundary. The real fix for this
5012 // should be to fix the guard page mechanism.
5014 if (vm_page_size() > 8*K) {
5015 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5016 ? threadStackSizeInBytes +
5017 ((StackYellowPages + StackRedPages) * vm_page_size())
5018 : 0;
5019 ThreadStackSize = threadStackSizeInBytes/K;
5020 }
5022 // Make the stack size a multiple of the page size so that
5023 // the yellow/red zones can be guarded.
5024 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5025 vm_page_size()));
5027 Solaris::libthread_init();
5029 if (UseNUMA) {
5030 if (!Solaris::liblgrp_init()) {
5031 UseNUMA = false;
5032 } else {
5033 size_t lgrp_limit = os::numa_get_groups_num();
5034 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit);
5035 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5036 FREE_C_HEAP_ARRAY(int, lgrp_ids);
5037 if (lgrp_num < 2) {
5038 // There's only one locality group, disable NUMA.
5039 UseNUMA = false;
5040 }
5041 }
5042 if (!UseNUMA && ForceNUMA) {
5043 UseNUMA = true;
5044 }
5045 }
5047 Solaris::signal_sets_init();
5048 Solaris::init_signal_mem();
5049 Solaris::install_signal_handlers();
5051 if (libjsigversion < JSIG_VERSION_1_4_1) {
5052 Maxlibjsigsigs = OLDMAXSIGNUM;
5053 }
5055 // initialize synchronization primitives to use either thread or
5056 // lwp synchronization (controlled by UseLWPSynchronization)
5057 Solaris::synchronization_init();
5059 if (MaxFDLimit) {
5060 // set the number of file descriptors to max. print out error
5061 // if getrlimit/setrlimit fails but continue regardless.
5062 struct rlimit nbr_files;
5063 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5064 if (status != 0) {
5065 if (PrintMiscellaneous && (Verbose || WizardMode))
5066 perror("os::init_2 getrlimit failed");
5067 } else {
5068 nbr_files.rlim_cur = nbr_files.rlim_max;
5069 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5070 if (status != 0) {
5071 if (PrintMiscellaneous && (Verbose || WizardMode))
5072 perror("os::init_2 setrlimit failed");
5073 }
5074 }
5075 }
5077 // Calculate theoretical max. size of Threads to guard gainst
5078 // artifical out-of-memory situations, where all available address-
5079 // space has been reserved by thread stacks. Default stack size is 1Mb.
5080 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5081 JavaThread::stack_size_at_create() : (1*K*K);
5082 assert(pre_thread_stack_size != 0, "Must have a stack");
5083 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5084 // we should start doing Virtual Memory banging. Currently when the threads will
5085 // have used all but 200Mb of space.
5086 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5087 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5089 // at-exit methods are called in the reverse order of their registration.
5090 // In Solaris 7 and earlier, atexit functions are called on return from
5091 // main or as a result of a call to exit(3C). There can be only 32 of
5092 // these functions registered and atexit() does not set errno. In Solaris
5093 // 8 and later, there is no limit to the number of functions registered
5094 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5095 // functions are called upon dlclose(3DL) in addition to return from main
5096 // and exit(3C).
5098 if (PerfAllowAtExitRegistration) {
5099 // only register atexit functions if PerfAllowAtExitRegistration is set.
5100 // atexit functions can be delayed until process exit time, which
5101 // can be problematic for embedded VM situations. Embedded VMs should
5102 // call DestroyJavaVM() to assure that VM resources are released.
5104 // note: perfMemory_exit_helper atexit function may be removed in
5105 // the future if the appropriate cleanup code can be added to the
5106 // VM_Exit VMOperation's doit method.
5107 if (atexit(perfMemory_exit_helper) != 0) {
5108 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5109 }
5110 }
5112 // Init pset_loadavg function pointer
5113 init_pset_getloadavg_ptr();
5115 return JNI_OK;
5116 }
5118 void os::init_3(void) {
5119 return;
5120 }
5122 // Mark the polling page as unreadable
5123 void os::make_polling_page_unreadable(void) {
5124 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5125 fatal("Could not disable polling page");
5126 };
5128 // Mark the polling page as readable
5129 void os::make_polling_page_readable(void) {
5130 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5131 fatal("Could not enable polling page");
5132 };
5134 // OS interface.
5136 bool os::check_heap(bool force) { return true; }
5138 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5139 static vsnprintf_t sol_vsnprintf = NULL;
5141 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5142 if (!sol_vsnprintf) {
5143 //search for the named symbol in the objects that were loaded after libjvm
5144 void* where = RTLD_NEXT;
5145 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5146 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5147 if (!sol_vsnprintf){
5148 //search for the named symbol in the objects that were loaded before libjvm
5149 where = RTLD_DEFAULT;
5150 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5151 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5152 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5153 }
5154 }
5155 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5156 }
5159 // Is a (classpath) directory empty?
5160 bool os::dir_is_empty(const char* path) {
5161 DIR *dir = NULL;
5162 struct dirent *ptr;
5164 dir = opendir(path);
5165 if (dir == NULL) return true;
5167 /* Scan the directory */
5168 bool result = true;
5169 char buf[sizeof(struct dirent) + MAX_PATH];
5170 struct dirent *dbuf = (struct dirent *) buf;
5171 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5172 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5173 result = false;
5174 }
5175 }
5176 closedir(dir);
5177 return result;
5178 }
5180 // This code originates from JDK's sysOpen and open64_w
5181 // from src/solaris/hpi/src/system_md.c
5183 #ifndef O_DELETE
5184 #define O_DELETE 0x10000
5185 #endif
5187 // Open a file. Unlink the file immediately after open returns
5188 // if the specified oflag has the O_DELETE flag set.
5189 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5191 int os::open(const char *path, int oflag, int mode) {
5192 if (strlen(path) > MAX_PATH - 1) {
5193 errno = ENAMETOOLONG;
5194 return -1;
5195 }
5196 int fd;
5197 int o_delete = (oflag & O_DELETE);
5198 oflag = oflag & ~O_DELETE;
5200 fd = ::open64(path, oflag, mode);
5201 if (fd == -1) return -1;
5203 //If the open succeeded, the file might still be a directory
5204 {
5205 struct stat64 buf64;
5206 int ret = ::fstat64(fd, &buf64);
5207 int st_mode = buf64.st_mode;
5209 if (ret != -1) {
5210 if ((st_mode & S_IFMT) == S_IFDIR) {
5211 errno = EISDIR;
5212 ::close(fd);
5213 return -1;
5214 }
5215 } else {
5216 ::close(fd);
5217 return -1;
5218 }
5219 }
5220 /*
5221 * 32-bit Solaris systems suffer from:
5222 *
5223 * - an historical default soft limit of 256 per-process file
5224 * descriptors that is too low for many Java programs.
5225 *
5226 * - a design flaw where file descriptors created using stdio
5227 * fopen must be less than 256, _even_ when the first limit above
5228 * has been raised. This can cause calls to fopen (but not calls to
5229 * open, for example) to fail mysteriously, perhaps in 3rd party
5230 * native code (although the JDK itself uses fopen). One can hardly
5231 * criticize them for using this most standard of all functions.
5232 *
5233 * We attempt to make everything work anyways by:
5234 *
5235 * - raising the soft limit on per-process file descriptors beyond
5236 * 256
5237 *
5238 * - As of Solaris 10u4, we can request that Solaris raise the 256
5239 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5240 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5241 *
5242 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5243 * workaround the bug by remapping non-stdio file descriptors below
5244 * 256 to ones beyond 256, which is done below.
5245 *
5246 * See:
5247 * 1085341: 32-bit stdio routines should support file descriptors >255
5248 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5249 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5250 * enable_extended_FILE_stdio() in VM initialisation
5251 * Giri Mandalika's blog
5252 * http://technopark02.blogspot.com/2005_05_01_archive.html
5253 */
5254 #ifndef _LP64
5255 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5256 int newfd = ::fcntl(fd, F_DUPFD, 256);
5257 if (newfd != -1) {
5258 ::close(fd);
5259 fd = newfd;
5260 }
5261 }
5262 #endif // 32-bit Solaris
5263 /*
5264 * All file descriptors that are opened in the JVM and not
5265 * specifically destined for a subprocess should have the
5266 * close-on-exec flag set. If we don't set it, then careless 3rd
5267 * party native code might fork and exec without closing all
5268 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5269 * UNIXProcess.c), and this in turn might:
5270 *
5271 * - cause end-of-file to fail to be detected on some file
5272 * descriptors, resulting in mysterious hangs, or
5273 *
5274 * - might cause an fopen in the subprocess to fail on a system
5275 * suffering from bug 1085341.
5276 *
5277 * (Yes, the default setting of the close-on-exec flag is a Unix
5278 * design flaw)
5279 *
5280 * See:
5281 * 1085341: 32-bit stdio routines should support file descriptors >255
5282 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5283 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5284 */
5285 #ifdef FD_CLOEXEC
5286 {
5287 int flags = ::fcntl(fd, F_GETFD);
5288 if (flags != -1)
5289 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5290 }
5291 #endif
5293 if (o_delete != 0) {
5294 ::unlink(path);
5295 }
5296 return fd;
5297 }
5299 // create binary file, rewriting existing file if required
5300 int os::create_binary_file(const char* path, bool rewrite_existing) {
5301 int oflags = O_WRONLY | O_CREAT;
5302 if (!rewrite_existing) {
5303 oflags |= O_EXCL;
5304 }
5305 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5306 }
5308 // return current position of file pointer
5309 jlong os::current_file_offset(int fd) {
5310 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5311 }
5313 // move file pointer to the specified offset
5314 jlong os::seek_to_file_offset(int fd, jlong offset) {
5315 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5316 }
5318 jlong os::lseek(int fd, jlong offset, int whence) {
5319 return (jlong) ::lseek64(fd, offset, whence);
5320 }
5322 char * os::native_path(char *path) {
5323 return path;
5324 }
5326 int os::ftruncate(int fd, jlong length) {
5327 return ::ftruncate64(fd, length);
5328 }
5330 int os::fsync(int fd) {
5331 RESTARTABLE_RETURN_INT(::fsync(fd));
5332 }
5334 int os::available(int fd, jlong *bytes) {
5335 jlong cur, end;
5336 int mode;
5337 struct stat64 buf64;
5339 if (::fstat64(fd, &buf64) >= 0) {
5340 mode = buf64.st_mode;
5341 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5342 /*
5343 * XXX: is the following call interruptible? If so, this might
5344 * need to go through the INTERRUPT_IO() wrapper as for other
5345 * blocking, interruptible calls in this file.
5346 */
5347 int n,ioctl_return;
5349 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5350 if (ioctl_return>= 0) {
5351 *bytes = n;
5352 return 1;
5353 }
5354 }
5355 }
5356 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5357 return 0;
5358 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5359 return 0;
5360 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5361 return 0;
5362 }
5363 *bytes = end - cur;
5364 return 1;
5365 }
5367 // Map a block of memory.
5368 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
5369 char *addr, size_t bytes, bool read_only,
5370 bool allow_exec) {
5371 int prot;
5372 int flags;
5374 if (read_only) {
5375 prot = PROT_READ;
5376 flags = MAP_SHARED;
5377 } else {
5378 prot = PROT_READ | PROT_WRITE;
5379 flags = MAP_PRIVATE;
5380 }
5382 if (allow_exec) {
5383 prot |= PROT_EXEC;
5384 }
5386 if (addr != NULL) {
5387 flags |= MAP_FIXED;
5388 }
5390 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5391 fd, file_offset);
5392 if (mapped_address == MAP_FAILED) {
5393 return NULL;
5394 }
5395 return mapped_address;
5396 }
5399 // Remap a block of memory.
5400 char* os::remap_memory(int fd, const char* file_name, size_t file_offset,
5401 char *addr, size_t bytes, bool read_only,
5402 bool allow_exec) {
5403 // same as map_memory() on this OS
5404 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5405 allow_exec);
5406 }
5409 // Unmap a block of memory.
5410 bool os::unmap_memory(char* addr, size_t bytes) {
5411 return munmap(addr, bytes) == 0;
5412 }
5414 void os::pause() {
5415 char filename[MAX_PATH];
5416 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5417 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5418 } else {
5419 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5420 }
5422 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5423 if (fd != -1) {
5424 struct stat buf;
5425 ::close(fd);
5426 while (::stat(filename, &buf) == 0) {
5427 (void)::poll(NULL, 0, 100);
5428 }
5429 } else {
5430 jio_fprintf(stderr,
5431 "Could not open pause file '%s', continuing immediately.\n", filename);
5432 }
5433 }
5435 #ifndef PRODUCT
5436 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5437 // Turn this on if you need to trace synch operations.
5438 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5439 // and call record_synch_enable and record_synch_disable
5440 // around the computation of interest.
5442 void record_synch(char* name, bool returning); // defined below
5444 class RecordSynch {
5445 char* _name;
5446 public:
5447 RecordSynch(char* name) :_name(name)
5448 { record_synch(_name, false); }
5449 ~RecordSynch() { record_synch(_name, true); }
5450 };
5452 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5453 extern "C" ret name params { \
5454 typedef ret name##_t params; \
5455 static name##_t* implem = NULL; \
5456 static int callcount = 0; \
5457 if (implem == NULL) { \
5458 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5459 if (implem == NULL) fatal(dlerror()); \
5460 } \
5461 ++callcount; \
5462 RecordSynch _rs(#name); \
5463 inner; \
5464 return implem args; \
5465 }
5466 // in dbx, examine callcounts this way:
5467 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5469 #define CHECK_POINTER_OK(p) \
5470 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p)))
5471 #define CHECK_MU \
5472 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5473 #define CHECK_CV \
5474 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5475 #define CHECK_P(p) \
5476 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5478 #define CHECK_MUTEX(mutex_op) \
5479 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5481 CHECK_MUTEX( mutex_lock)
5482 CHECK_MUTEX( _mutex_lock)
5483 CHECK_MUTEX( mutex_unlock)
5484 CHECK_MUTEX(_mutex_unlock)
5485 CHECK_MUTEX( mutex_trylock)
5486 CHECK_MUTEX(_mutex_trylock)
5488 #define CHECK_COND(cond_op) \
5489 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5491 CHECK_COND( cond_wait);
5492 CHECK_COND(_cond_wait);
5493 CHECK_COND(_cond_wait_cancel);
5495 #define CHECK_COND2(cond_op) \
5496 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5498 CHECK_COND2( cond_timedwait);
5499 CHECK_COND2(_cond_timedwait);
5500 CHECK_COND2(_cond_timedwait_cancel);
5502 // do the _lwp_* versions too
5503 #define mutex_t lwp_mutex_t
5504 #define cond_t lwp_cond_t
5505 CHECK_MUTEX( _lwp_mutex_lock)
5506 CHECK_MUTEX( _lwp_mutex_unlock)
5507 CHECK_MUTEX( _lwp_mutex_trylock)
5508 CHECK_MUTEX( __lwp_mutex_lock)
5509 CHECK_MUTEX( __lwp_mutex_unlock)
5510 CHECK_MUTEX( __lwp_mutex_trylock)
5511 CHECK_MUTEX(___lwp_mutex_lock)
5512 CHECK_MUTEX(___lwp_mutex_unlock)
5514 CHECK_COND( _lwp_cond_wait);
5515 CHECK_COND( __lwp_cond_wait);
5516 CHECK_COND(___lwp_cond_wait);
5518 CHECK_COND2( _lwp_cond_timedwait);
5519 CHECK_COND2( __lwp_cond_timedwait);
5520 #undef mutex_t
5521 #undef cond_t
5523 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5524 CHECK_SYNCH_OP(int,__lwp_suspend2, (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_kill, (int lwp, int n), (lwp, n), 0);
5527 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5528 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5529 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5530 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5533 // recording machinery:
5535 enum { RECORD_SYNCH_LIMIT = 200 };
5536 char* record_synch_name[RECORD_SYNCH_LIMIT];
5537 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5538 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5539 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5540 int record_synch_count = 0;
5541 bool record_synch_enabled = false;
5543 // in dbx, examine recorded data this way:
5544 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5546 void record_synch(char* name, bool returning) {
5547 if (record_synch_enabled) {
5548 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5549 record_synch_name[record_synch_count] = name;
5550 record_synch_returning[record_synch_count] = returning;
5551 record_synch_thread[record_synch_count] = thr_self();
5552 record_synch_arg0ptr[record_synch_count] = &name;
5553 record_synch_count++;
5554 }
5555 // put more checking code here:
5556 // ...
5557 }
5558 }
5560 void record_synch_enable() {
5561 // start collecting trace data, if not already doing so
5562 if (!record_synch_enabled) record_synch_count = 0;
5563 record_synch_enabled = true;
5564 }
5566 void record_synch_disable() {
5567 // stop collecting trace data
5568 record_synch_enabled = false;
5569 }
5571 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5572 #endif // PRODUCT
5574 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5575 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5576 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5579 // JVMTI & JVM monitoring and management support
5580 // The thread_cpu_time() and current_thread_cpu_time() are only
5581 // supported if is_thread_cpu_time_supported() returns true.
5582 // They are not supported on Solaris T1.
5584 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5585 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5586 // of a thread.
5587 //
5588 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5589 // returns the fast estimate available on the platform.
5591 // hrtime_t gethrvtime() return value includes
5592 // user time but does not include system time
5593 jlong os::current_thread_cpu_time() {
5594 return (jlong) gethrvtime();
5595 }
5597 jlong os::thread_cpu_time(Thread *thread) {
5598 // return user level CPU time only to be consistent with
5599 // what current_thread_cpu_time returns.
5600 // thread_cpu_time_info() must be changed if this changes
5601 return os::thread_cpu_time(thread, false /* user time only */);
5602 }
5604 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5605 if (user_sys_cpu_time) {
5606 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5607 } else {
5608 return os::current_thread_cpu_time();
5609 }
5610 }
5612 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5613 char proc_name[64];
5614 int count;
5615 prusage_t prusage;
5616 jlong lwp_time;
5617 int fd;
5619 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5620 getpid(),
5621 thread->osthread()->lwp_id());
5622 fd = ::open(proc_name, O_RDONLY);
5623 if ( fd == -1 ) return -1;
5625 do {
5626 count = ::pread(fd,
5627 (void *)&prusage.pr_utime,
5628 thr_time_size,
5629 thr_time_off);
5630 } while (count < 0 && errno == EINTR);
5631 ::close(fd);
5632 if ( count < 0 ) return -1;
5634 if (user_sys_cpu_time) {
5635 // user + system CPU time
5636 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5637 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5638 (jlong)prusage.pr_stime.tv_nsec +
5639 (jlong)prusage.pr_utime.tv_nsec;
5640 } else {
5641 // user level CPU time only
5642 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5643 (jlong)prusage.pr_utime.tv_nsec;
5644 }
5646 return(lwp_time);
5647 }
5649 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5650 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5651 info_ptr->may_skip_backward = false; // elapsed time not wall time
5652 info_ptr->may_skip_forward = false; // elapsed time not wall time
5653 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5654 }
5656 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5657 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5658 info_ptr->may_skip_backward = false; // elapsed time not wall time
5659 info_ptr->may_skip_forward = false; // elapsed time not wall time
5660 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5661 }
5663 bool os::is_thread_cpu_time_supported() {
5664 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5665 return true;
5666 } else {
5667 return false;
5668 }
5669 }
5671 // System loadavg support. Returns -1 if load average cannot be obtained.
5672 // Return the load average for our processor set if the primitive exists
5673 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5674 int os::loadavg(double loadavg[], int nelem) {
5675 if (pset_getloadavg_ptr != NULL) {
5676 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5677 } else {
5678 return ::getloadavg(loadavg, nelem);
5679 }
5680 }
5682 //---------------------------------------------------------------------------------
5684 static address same_page(address x, address y) {
5685 intptr_t page_bits = -os::vm_page_size();
5686 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
5687 return x;
5688 else if (x > y)
5689 return (address)(intptr_t(y) | ~page_bits) + 1;
5690 else
5691 return (address)(intptr_t(y) & page_bits);
5692 }
5694 bool os::find(address addr, outputStream* st) {
5695 Dl_info dlinfo;
5696 memset(&dlinfo, 0, sizeof(dlinfo));
5697 if (dladdr(addr, &dlinfo)) {
5698 #ifdef _LP64
5699 st->print("0x%016lx: ", addr);
5700 #else
5701 st->print("0x%08x: ", addr);
5702 #endif
5703 if (dlinfo.dli_sname != NULL)
5704 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5705 else if (dlinfo.dli_fname)
5706 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5707 else
5708 st->print("<absolute address>");
5709 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname);
5710 #ifdef _LP64
5711 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase);
5712 #else
5713 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase);
5714 #endif
5715 st->cr();
5717 if (Verbose) {
5718 // decode some bytes around the PC
5719 address begin = same_page(addr-40, addr);
5720 address end = same_page(addr+40, addr);
5721 address lowest = (address) dlinfo.dli_sname;
5722 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5723 if (begin < lowest) begin = lowest;
5724 Dl_info dlinfo2;
5725 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr
5726 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5727 end = (address) dlinfo2.dli_saddr;
5728 Disassembler::decode(begin, end, st);
5729 }
5730 return true;
5731 }
5732 return false;
5733 }
5735 // Following function has been added to support HotSparc's libjvm.so running
5736 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5737 // src/solaris/hpi/native_threads in the EVM codebase.
5738 //
5739 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5740 // libraries and should thus be removed. We will leave it behind for a while
5741 // until we no longer want to able to run on top of 1.3.0 Solaris production
5742 // JDK. See 4341971.
5744 #define STACK_SLACK 0x800
5746 extern "C" {
5747 intptr_t sysThreadAvailableStackWithSlack() {
5748 stack_t st;
5749 intptr_t retval, stack_top;
5750 retval = thr_stksegment(&st);
5751 assert(retval == 0, "incorrect return value from thr_stksegment");
5752 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5753 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5754 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5755 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5756 }
5757 }
5759 // Just to get the Kernel build to link on solaris for testing.
5761 extern "C" {
5762 class ASGCT_CallTrace;
5763 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext)
5764 KERNEL_RETURN;
5765 }
5768 // ObjectMonitor park-unpark infrastructure ...
5769 //
5770 // We implement Solaris and Linux PlatformEvents with the
5771 // obvious condvar-mutex-flag triple.
5772 // Another alternative that works quite well is pipes:
5773 // Each PlatformEvent consists of a pipe-pair.
5774 // The thread associated with the PlatformEvent
5775 // calls park(), which reads from the input end of the pipe.
5776 // Unpark() writes into the other end of the pipe.
5777 // The write-side of the pipe must be set NDELAY.
5778 // Unfortunately pipes consume a large # of handles.
5779 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5780 // Using pipes for the 1st few threads might be workable, however.
5781 //
5782 // park() is permitted to return spuriously.
5783 // Callers of park() should wrap the call to park() in
5784 // an appropriate loop. A litmus test for the correct
5785 // usage of park is the following: if park() were modified
5786 // to immediately return 0 your code should still work,
5787 // albeit degenerating to a spin loop.
5788 //
5789 // An interesting optimization for park() is to use a trylock()
5790 // to attempt to acquire the mutex. If the trylock() fails
5791 // then we know that a concurrent unpark() operation is in-progress.
5792 // in that case the park() code could simply set _count to 0
5793 // and return immediately. The subsequent park() operation *might*
5794 // return immediately. That's harmless as the caller of park() is
5795 // expected to loop. By using trylock() we will have avoided a
5796 // avoided a context switch caused by contention on the per-thread mutex.
5797 //
5798 // TODO-FIXME:
5799 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5800 // objectmonitor implementation.
5801 // 2. Collapse the JSR166 parker event, and the
5802 // objectmonitor ParkEvent into a single "Event" construct.
5803 // 3. In park() and unpark() add:
5804 // assert (Thread::current() == AssociatedWith).
5805 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5806 // 1-out-of-N park() operations will return immediately.
5807 //
5808 // _Event transitions in park()
5809 // -1 => -1 : illegal
5810 // 1 => 0 : pass - return immediately
5811 // 0 => -1 : block
5812 //
5813 // _Event serves as a restricted-range semaphore.
5814 //
5815 // Another possible encoding of _Event would be with
5816 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5817 //
5818 // TODO-FIXME: add DTRACE probes for:
5819 // 1. Tx parks
5820 // 2. Ty unparks Tx
5821 // 3. Tx resumes from park
5824 // value determined through experimentation
5825 #define ROUNDINGFIX 11
5827 // utility to compute the abstime argument to timedwait.
5828 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5830 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5831 // millis is the relative timeout time
5832 // abstime will be the absolute timeout time
5833 if (millis < 0) millis = 0;
5834 struct timeval now;
5835 int status = gettimeofday(&now, NULL);
5836 assert(status == 0, "gettimeofday");
5837 jlong seconds = millis / 1000;
5838 jlong max_wait_period;
5840 if (UseLWPSynchronization) {
5841 // forward port of fix for 4275818 (not sleeping long enough)
5842 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5843 // _lwp_cond_timedwait() used a round_down algorithm rather
5844 // than a round_up. For millis less than our roundfactor
5845 // it rounded down to 0 which doesn't meet the spec.
5846 // For millis > roundfactor we may return a bit sooner, but
5847 // since we can not accurately identify the patch level and
5848 // this has already been fixed in Solaris 9 and 8 we will
5849 // leave it alone rather than always rounding down.
5851 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5852 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5853 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5854 max_wait_period = 21000000;
5855 } else {
5856 max_wait_period = 50000000;
5857 }
5858 millis %= 1000;
5859 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5860 seconds = max_wait_period;
5861 }
5862 abstime->tv_sec = now.tv_sec + seconds;
5863 long usec = now.tv_usec + millis * 1000;
5864 if (usec >= 1000000) {
5865 abstime->tv_sec += 1;
5866 usec -= 1000000;
5867 }
5868 abstime->tv_nsec = usec * 1000;
5869 return abstime;
5870 }
5872 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5873 // Conceptually TryPark() should be equivalent to park(0).
5875 int os::PlatformEvent::TryPark() {
5876 for (;;) {
5877 const int v = _Event ;
5878 guarantee ((v == 0) || (v == 1), "invariant") ;
5879 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5880 }
5881 }
5883 void os::PlatformEvent::park() { // AKA: down()
5884 // Invariant: Only the thread associated with the Event/PlatformEvent
5885 // may call park().
5886 int v ;
5887 for (;;) {
5888 v = _Event ;
5889 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5890 }
5891 guarantee (v >= 0, "invariant") ;
5892 if (v == 0) {
5893 // Do this the hard way by blocking ...
5894 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5895 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5896 // Only for SPARC >= V8PlusA
5897 #if defined(__sparc) && defined(COMPILER2)
5898 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5899 #endif
5900 int status = os::Solaris::mutex_lock(_mutex);
5901 assert_status(status == 0, status, "mutex_lock");
5902 guarantee (_nParked == 0, "invariant") ;
5903 ++ _nParked ;
5904 while (_Event < 0) {
5905 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5906 // Treat this the same as if the wait was interrupted
5907 // With usr/lib/lwp going to kernel, always handle ETIME
5908 status = os::Solaris::cond_wait(_cond, _mutex);
5909 if (status == ETIME) status = EINTR ;
5910 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5911 }
5912 -- _nParked ;
5913 _Event = 0 ;
5914 status = os::Solaris::mutex_unlock(_mutex);
5915 assert_status(status == 0, status, "mutex_unlock");
5916 }
5917 }
5919 int os::PlatformEvent::park(jlong millis) {
5920 guarantee (_nParked == 0, "invariant") ;
5921 int v ;
5922 for (;;) {
5923 v = _Event ;
5924 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5925 }
5926 guarantee (v >= 0, "invariant") ;
5927 if (v != 0) return OS_OK ;
5929 int ret = OS_TIMEOUT;
5930 timestruc_t abst;
5931 compute_abstime (&abst, millis);
5933 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5934 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5935 // Only for SPARC >= V8PlusA
5936 #if defined(__sparc) && defined(COMPILER2)
5937 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5938 #endif
5939 int status = os::Solaris::mutex_lock(_mutex);
5940 assert_status(status == 0, status, "mutex_lock");
5941 guarantee (_nParked == 0, "invariant") ;
5942 ++ _nParked ;
5943 while (_Event < 0) {
5944 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5945 assert_status(status == 0 || status == EINTR ||
5946 status == ETIME || status == ETIMEDOUT,
5947 status, "cond_timedwait");
5948 if (!FilterSpuriousWakeups) break ; // previous semantics
5949 if (status == ETIME || status == ETIMEDOUT) break ;
5950 // We consume and ignore EINTR and spurious wakeups.
5951 }
5952 -- _nParked ;
5953 if (_Event >= 0) ret = OS_OK ;
5954 _Event = 0 ;
5955 status = os::Solaris::mutex_unlock(_mutex);
5956 assert_status(status == 0, status, "mutex_unlock");
5957 return ret;
5958 }
5960 void os::PlatformEvent::unpark() {
5961 int v, AnyWaiters;
5963 // Increment _Event.
5964 // Another acceptable implementation would be to simply swap 1
5965 // into _Event:
5966 // if (Swap (&_Event, 1) < 0) {
5967 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ;
5968 // if (AnyWaiters) cond_signal (_cond) ;
5969 // }
5971 for (;;) {
5972 v = _Event ;
5973 if (v > 0) {
5974 // The LD of _Event could have reordered or be satisfied
5975 // by a read-aside from this processor's write buffer.
5976 // To avoid problems execute a barrier and then
5977 // ratify the value. A degenerate CAS() would also work.
5978 // Viz., CAS (v+0, &_Event, v) == v).
5979 OrderAccess::fence() ;
5980 if (_Event == v) return ;
5981 continue ;
5982 }
5983 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ;
5984 }
5986 // If the thread associated with the event was parked, wake it.
5987 if (v < 0) {
5988 int status ;
5989 // Wait for the thread assoc with the PlatformEvent to vacate.
5990 status = os::Solaris::mutex_lock(_mutex);
5991 assert_status(status == 0, status, "mutex_lock");
5992 AnyWaiters = _nParked ;
5993 status = os::Solaris::mutex_unlock(_mutex);
5994 assert_status(status == 0, status, "mutex_unlock");
5995 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ;
5996 if (AnyWaiters != 0) {
5997 // We intentional signal *after* dropping the lock
5998 // to avoid a common class of futile wakeups.
5999 status = os::Solaris::cond_signal(_cond);
6000 assert_status(status == 0, status, "cond_signal");
6001 }
6002 }
6003 }
6005 // JSR166
6006 // -------------------------------------------------------
6008 /*
6009 * The solaris and linux implementations of park/unpark are fairly
6010 * conservative for now, but can be improved. They currently use a
6011 * mutex/condvar pair, plus _counter.
6012 * Park decrements _counter if > 0, else does a condvar wait. Unpark
6013 * sets count to 1 and signals condvar. Only one thread ever waits
6014 * on the condvar. Contention seen when trying to park implies that someone
6015 * is unparking you, so don't wait. And spurious returns are fine, so there
6016 * is no need to track notifications.
6017 */
6019 #define NANOSECS_PER_SEC 1000000000
6020 #define NANOSECS_PER_MILLISEC 1000000
6021 #define MAX_SECS 100000000
6023 /*
6024 * This code is common to linux and solaris and will be moved to a
6025 * common place in dolphin.
6026 *
6027 * The passed in time value is either a relative time in nanoseconds
6028 * or an absolute time in milliseconds. Either way it has to be unpacked
6029 * into suitable seconds and nanoseconds components and stored in the
6030 * given timespec structure.
6031 * Given time is a 64-bit value and the time_t used in the timespec is only
6032 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
6033 * overflow if times way in the future are given. Further on Solaris versions
6034 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6035 * number of seconds, in abstime, is less than current_time + 100,000,000.
6036 * As it will be 28 years before "now + 100000000" will overflow we can
6037 * ignore overflow and just impose a hard-limit on seconds using the value
6038 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6039 * years from "now".
6040 */
6041 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6042 assert (time > 0, "convertTime");
6044 struct timeval now;
6045 int status = gettimeofday(&now, NULL);
6046 assert(status == 0, "gettimeofday");
6048 time_t max_secs = now.tv_sec + MAX_SECS;
6050 if (isAbsolute) {
6051 jlong secs = time / 1000;
6052 if (secs > max_secs) {
6053 absTime->tv_sec = max_secs;
6054 }
6055 else {
6056 absTime->tv_sec = secs;
6057 }
6058 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6059 }
6060 else {
6061 jlong secs = time / NANOSECS_PER_SEC;
6062 if (secs >= MAX_SECS) {
6063 absTime->tv_sec = max_secs;
6064 absTime->tv_nsec = 0;
6065 }
6066 else {
6067 absTime->tv_sec = now.tv_sec + secs;
6068 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6069 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6070 absTime->tv_nsec -= NANOSECS_PER_SEC;
6071 ++absTime->tv_sec; // note: this must be <= max_secs
6072 }
6073 }
6074 }
6075 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6076 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6077 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6078 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6079 }
6081 void Parker::park(bool isAbsolute, jlong time) {
6083 // Optional fast-path check:
6084 // Return immediately if a permit is available.
6085 if (_counter > 0) {
6086 _counter = 0 ;
6087 OrderAccess::fence();
6088 return ;
6089 }
6091 // Optional fast-exit: Check interrupt before trying to wait
6092 Thread* thread = Thread::current();
6093 assert(thread->is_Java_thread(), "Must be JavaThread");
6094 JavaThread *jt = (JavaThread *)thread;
6095 if (Thread::is_interrupted(thread, false)) {
6096 return;
6097 }
6099 // First, demultiplex/decode time arguments
6100 timespec absTime;
6101 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6102 return;
6103 }
6104 if (time > 0) {
6105 // Warning: this code might be exposed to the old Solaris time
6106 // round-down bugs. Grep "roundingFix" for details.
6107 unpackTime(&absTime, isAbsolute, time);
6108 }
6110 // Enter safepoint region
6111 // Beware of deadlocks such as 6317397.
6112 // The per-thread Parker:: _mutex is a classic leaf-lock.
6113 // In particular a thread must never block on the Threads_lock while
6114 // holding the Parker:: mutex. If safepoints are pending both the
6115 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6116 ThreadBlockInVM tbivm(jt);
6118 // Don't wait if cannot get lock since interference arises from
6119 // unblocking. Also. check interrupt before trying wait
6120 if (Thread::is_interrupted(thread, false) ||
6121 os::Solaris::mutex_trylock(_mutex) != 0) {
6122 return;
6123 }
6125 int status ;
6127 if (_counter > 0) { // no wait needed
6128 _counter = 0;
6129 status = os::Solaris::mutex_unlock(_mutex);
6130 assert (status == 0, "invariant") ;
6131 OrderAccess::fence();
6132 return;
6133 }
6135 #ifdef ASSERT
6136 // Don't catch signals while blocked; let the running threads have the signals.
6137 // (This allows a debugger to break into the running thread.)
6138 sigset_t oldsigs;
6139 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6140 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6141 #endif
6143 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6144 jt->set_suspend_equivalent();
6145 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6147 // Do this the hard way by blocking ...
6148 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6149 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6150 // Only for SPARC >= V8PlusA
6151 #if defined(__sparc) && defined(COMPILER2)
6152 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6153 #endif
6155 if (time == 0) {
6156 status = os::Solaris::cond_wait (_cond, _mutex) ;
6157 } else {
6158 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6159 }
6160 // Note that an untimed cond_wait() can sometimes return ETIME on older
6161 // versions of the Solaris.
6162 assert_status(status == 0 || status == EINTR ||
6163 status == ETIME || status == ETIMEDOUT,
6164 status, "cond_timedwait");
6166 #ifdef ASSERT
6167 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6168 #endif
6169 _counter = 0 ;
6170 status = os::Solaris::mutex_unlock(_mutex);
6171 assert_status(status == 0, status, "mutex_unlock") ;
6173 // If externally suspended while waiting, re-suspend
6174 if (jt->handle_special_suspend_equivalent_condition()) {
6175 jt->java_suspend_self();
6176 }
6177 OrderAccess::fence();
6178 }
6180 void Parker::unpark() {
6181 int s, status ;
6182 status = os::Solaris::mutex_lock (_mutex) ;
6183 assert (status == 0, "invariant") ;
6184 s = _counter;
6185 _counter = 1;
6186 status = os::Solaris::mutex_unlock (_mutex) ;
6187 assert (status == 0, "invariant") ;
6189 if (s < 1) {
6190 status = os::Solaris::cond_signal (_cond) ;
6191 assert (status == 0, "invariant") ;
6192 }
6193 }
6195 extern char** environ;
6197 // Run the specified command in a separate process. Return its exit value,
6198 // or -1 on failure (e.g. can't fork a new process).
6199 // Unlike system(), this function can be called from signal handler. It
6200 // doesn't block SIGINT et al.
6201 int os::fork_and_exec(char* cmd) {
6202 char * argv[4];
6203 argv[0] = (char *)"sh";
6204 argv[1] = (char *)"-c";
6205 argv[2] = cmd;
6206 argv[3] = NULL;
6208 // fork is async-safe, fork1 is not so can't use in signal handler
6209 pid_t pid;
6210 Thread* t = ThreadLocalStorage::get_thread_slow();
6211 if (t != NULL && t->is_inside_signal_handler()) {
6212 pid = fork();
6213 } else {
6214 pid = fork1();
6215 }
6217 if (pid < 0) {
6218 // fork failed
6219 warning("fork failed: %s", strerror(errno));
6220 return -1;
6222 } else if (pid == 0) {
6223 // child process
6225 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6226 execve("/usr/bin/sh", argv, environ);
6228 // execve failed
6229 _exit(-1);
6231 } else {
6232 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6233 // care about the actual exit code, for now.
6235 int status;
6237 // Wait for the child process to exit. This returns immediately if
6238 // the child has already exited. */
6239 while (waitpid(pid, &status, 0) < 0) {
6240 switch (errno) {
6241 case ECHILD: return 0;
6242 case EINTR: break;
6243 default: return -1;
6244 }
6245 }
6247 if (WIFEXITED(status)) {
6248 // The child exited normally; get its exit code.
6249 return WEXITSTATUS(status);
6250 } else if (WIFSIGNALED(status)) {
6251 // The child exited because of a signal
6252 // The best value to return is 0x80 + signal number,
6253 // because that is what all Unix shells do, and because
6254 // it allows callers to distinguish between process exit and
6255 // process death by signal.
6256 return 0x80 + WTERMSIG(status);
6257 } else {
6258 // Unknown exit code; pass it through
6259 return status;
6260 }
6261 }
6262 }
6264 // is_headless_jre()
6265 //
6266 // Test for the existence of libmawt in motif21 or xawt directories
6267 // in order to report if we are running in a headless jre
6268 //
6269 bool os::is_headless_jre() {
6270 struct stat statbuf;
6271 char buf[MAXPATHLEN];
6272 char libmawtpath[MAXPATHLEN];
6273 const char *xawtstr = "/xawt/libmawt.so";
6274 const char *motifstr = "/motif21/libmawt.so";
6275 char *p;
6277 // Get path to libjvm.so
6278 os::jvm_path(buf, sizeof(buf));
6280 // Get rid of libjvm.so
6281 p = strrchr(buf, '/');
6282 if (p == NULL) return false;
6283 else *p = '\0';
6285 // Get rid of client or server
6286 p = strrchr(buf, '/');
6287 if (p == NULL) return false;
6288 else *p = '\0';
6290 // check xawt/libmawt.so
6291 strcpy(libmawtpath, buf);
6292 strcat(libmawtpath, xawtstr);
6293 if (::stat(libmawtpath, &statbuf) == 0) return false;
6295 // check motif21/libmawt.so
6296 strcpy(libmawtpath, buf);
6297 strcat(libmawtpath, motifstr);
6298 if (::stat(libmawtpath, &statbuf) == 0) return false;
6300 return true;
6301 }
6303 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6304 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6305 }
6307 int os::close(int fd) {
6308 RESTARTABLE_RETURN_INT(::close(fd));
6309 }
6311 int os::socket_close(int fd) {
6312 RESTARTABLE_RETURN_INT(::close(fd));
6313 }
6315 int os::recv(int fd, char *buf, int nBytes, int flags) {
6316 INTERRUPTIBLE_RETURN_INT(::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6317 }
6320 int os::send(int fd, char *buf, int nBytes, int flags) {
6321 INTERRUPTIBLE_RETURN_INT(::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6322 }
6324 int os::raw_send(int fd, char *buf, int nBytes, int flags) {
6325 RESTARTABLE_RETURN_INT(::send(fd, buf, nBytes, flags));
6326 }
6328 // As both poll and select can be interrupted by signals, we have to be
6329 // prepared to restart the system call after updating the timeout, unless
6330 // a poll() is done with timeout == -1, in which case we repeat with this
6331 // "wait forever" value.
6333 int os::timeout(int fd, long timeout) {
6334 int res;
6335 struct timeval t;
6336 julong prevtime, newtime;
6337 static const char* aNull = 0;
6338 struct pollfd pfd;
6339 pfd.fd = fd;
6340 pfd.events = POLLIN;
6342 gettimeofday(&t, &aNull);
6343 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6345 for(;;) {
6346 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6347 if(res == OS_ERR && errno == EINTR) {
6348 if(timeout != -1) {
6349 gettimeofday(&t, &aNull);
6350 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6351 timeout -= newtime - prevtime;
6352 if(timeout <= 0)
6353 return OS_OK;
6354 prevtime = newtime;
6355 }
6356 } else return res;
6357 }
6358 }
6360 int os::connect(int fd, struct sockaddr *him, int len) {
6361 int _result;
6362 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,
6363 os::Solaris::clear_interrupted);
6365 // Depending on when thread interruption is reset, _result could be
6366 // one of two values when errno == EINTR
6368 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6369 && (errno == EINTR)) {
6370 /* restarting a connect() changes its errno semantics */
6371 INTERRUPTIBLE(::connect(fd, him, len), _result,
6372 os::Solaris::clear_interrupted);
6373 /* undo these changes */
6374 if (_result == OS_ERR) {
6375 if (errno == EALREADY) {
6376 errno = EINPROGRESS; /* fall through */
6377 } else if (errno == EISCONN) {
6378 errno = 0;
6379 return OS_OK;
6380 }
6381 }
6382 }
6383 return _result;
6384 }
6386 int os::accept(int fd, struct sockaddr *him, int *len) {
6387 if (fd < 0)
6388 return OS_ERR;
6389 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him,\
6390 (socklen_t*) len), os::Solaris::clear_interrupted);
6391 }
6393 int os::recvfrom(int fd, char *buf, int nBytes, int flags,
6394 sockaddr *from, int *fromlen) {
6395 //%%note jvm_r11
6396 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes,\
6397 flags, from, fromlen), os::Solaris::clear_interrupted);
6398 }
6400 int os::sendto(int fd, char *buf, int len, int flags,
6401 struct sockaddr *to, int tolen) {
6402 //%%note jvm_r11
6403 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags,\
6404 to, tolen), os::Solaris::clear_interrupted);
6405 }
6407 int os::socket_available(int fd, jint *pbytes) {
6408 if (fd < 0)
6409 return OS_OK;
6411 int ret;
6413 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6415 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
6416 // is expected to return 0 on failure and 1 on success to the jdk.
6418 return (ret == OS_ERR) ? 0 : 1;
6419 }
6422 int os::bind(int fd, struct sockaddr *him, int len) {
6423 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6424 os::Solaris::clear_interrupted);
6425 }