Fri, 17 May 2019 18:13:25 +0100
8151322: Implement os::set_native_thread_name() on Solaris
Reviewed-by: sla, kbarrett, gziemski
1 /*
2 * Copyright (c) 1997, 2019, 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.
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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 "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_solaris.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_solaris.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "prims/jniFastGetField.hpp"
41 #include "prims/jvm.h"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/orderAccess.inline.hpp"
52 #include "runtime/osThread.hpp"
53 #include "runtime/perfMemory.hpp"
54 #include "runtime/sharedRuntime.hpp"
55 #include "runtime/statSampler.hpp"
56 #include "runtime/stubRoutines.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/threadCritical.hpp"
59 #include "runtime/timer.hpp"
60 #include "services/attachListener.hpp"
61 #include "services/memTracker.hpp"
62 #include "services/runtimeService.hpp"
63 #include "utilities/decoder.hpp"
64 #include "utilities/defaultStream.hpp"
65 #include "utilities/events.hpp"
66 #include "utilities/growableArray.hpp"
67 #include "utilities/vmError.hpp"
69 // put OS-includes here
70 # include <dlfcn.h>
71 # include <errno.h>
72 # include <exception>
73 # include <link.h>
74 # include <poll.h>
75 # include <pthread.h>
76 # include <pwd.h>
77 # include <schedctl.h>
78 # include <setjmp.h>
79 # include <signal.h>
80 # include <stdio.h>
81 # include <alloca.h>
82 # include <sys/filio.h>
83 # include <sys/ipc.h>
84 # include <sys/lwp.h>
85 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
86 # include <sys/mman.h>
87 # include <sys/processor.h>
88 # include <sys/procset.h>
89 # include <sys/pset.h>
90 # include <sys/resource.h>
91 # include <sys/shm.h>
92 # include <sys/socket.h>
93 # include <sys/stat.h>
94 # include <sys/systeminfo.h>
95 # include <sys/time.h>
96 # include <sys/times.h>
97 # include <sys/types.h>
98 # include <sys/wait.h>
99 # include <sys/utsname.h>
100 # include <thread.h>
101 # include <unistd.h>
102 # include <sys/priocntl.h>
103 # include <sys/rtpriocntl.h>
104 # include <sys/tspriocntl.h>
105 # include <sys/iapriocntl.h>
106 # include <sys/fxpriocntl.h>
107 # include <sys/loadavg.h>
108 # include <string.h>
109 # include <stdio.h>
111 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
112 # include <sys/procfs.h> // see comment in <sys/procfs.h>
114 #define MAX_PATH (2 * K)
116 // for timer info max values which include all bits
117 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
120 // Here are some liblgrp types from sys/lgrp_user.h to be able to
121 // compile on older systems without this header file.
123 #ifndef MADV_ACCESS_LWP
124 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
125 #endif
126 #ifndef MADV_ACCESS_MANY
127 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
128 #endif
130 #ifndef LGRP_RSRC_CPU
131 # define LGRP_RSRC_CPU 0 /* CPU resources */
132 #endif
133 #ifndef LGRP_RSRC_MEM
134 # define LGRP_RSRC_MEM 1 /* memory resources */
135 #endif
137 // see thr_setprio(3T) for the basis of these numbers
138 #define MinimumPriority 0
139 #define NormalPriority 64
140 #define MaximumPriority 127
142 // Values for ThreadPriorityPolicy == 1
143 int prio_policy1[CriticalPriority+1] = {
144 -99999, 0, 16, 32, 48, 64,
145 80, 96, 112, 124, 127, 127 };
147 // System parameters used internally
148 static clock_t clock_tics_per_sec = 100;
150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
151 static bool enabled_extended_FILE_stdio = false;
153 // For diagnostics to print a message once. see run_periodic_checks
154 static bool check_addr0_done = false;
155 static sigset_t check_signal_done;
156 static bool check_signals = true;
158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
165 // "default" initializers for missing libc APIs
166 extern "C" {
167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
171 static int lwp_cond_destroy(cond_t *cv) { return 0; }
172 }
174 // "default" initializers for pthread-based synchronization
175 extern "C" {
176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
178 }
180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
182 static inline size_t adjust_stack_size(address base, size_t size) {
183 if ((ssize_t)size < 0) {
184 // 4759953: Compensate for ridiculous stack size.
185 size = max_intx;
186 }
187 if (size > (size_t)base) {
188 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
189 size = (size_t)base;
190 }
191 return size;
192 }
194 static inline stack_t get_stack_info() {
195 stack_t st;
196 int retval = thr_stksegment(&st);
197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
198 assert(retval == 0, "incorrect return value from thr_stksegment");
199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
201 return st;
202 }
204 bool os::is_primordial_thread(void) {
205 int r = thr_main() ;
206 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
207 return r == 1;
208 }
210 address os::current_stack_base() {
211 bool _is_primordial_thread = is_primordial_thread();
213 // Workaround 4352906, avoid calls to thr_stksegment by
214 // thr_main after the first one (it looks like we trash
215 // some data, causing the value for ss_sp to be incorrect).
216 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
217 stack_t st = get_stack_info();
218 if (_is_primordial_thread) {
219 // cache initial value of stack base
220 os::Solaris::_main_stack_base = (address)st.ss_sp;
221 }
222 return (address)st.ss_sp;
223 } else {
224 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
225 return os::Solaris::_main_stack_base;
226 }
227 }
229 size_t os::current_stack_size() {
230 size_t size;
232 if (!is_primordial_thread()) {
233 size = get_stack_info().ss_size;
234 } else {
235 struct rlimit limits;
236 getrlimit(RLIMIT_STACK, &limits);
237 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
238 }
239 // base may not be page aligned
240 address base = current_stack_base();
241 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
242 return (size_t)(base - bottom);
243 }
245 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
246 return localtime_r(clock, res);
247 }
249 // interruptible infrastructure
251 // setup_interruptible saves the thread state before going into an
252 // interruptible system call.
253 // The saved state is used to restore the thread to
254 // its former state whether or not an interrupt is received.
255 // Used by classloader os::read
256 // os::restartable_read calls skip this layer and stay in _thread_in_native
258 void os::Solaris::setup_interruptible(JavaThread* thread) {
260 JavaThreadState thread_state = thread->thread_state();
262 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
263 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
264 OSThread* osthread = thread->osthread();
265 osthread->set_saved_interrupt_thread_state(thread_state);
266 thread->frame_anchor()->make_walkable(thread);
267 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
268 }
270 // Version of setup_interruptible() for threads that are already in
271 // _thread_blocked. Used by os_sleep().
272 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
273 thread->frame_anchor()->make_walkable(thread);
274 }
276 JavaThread* os::Solaris::setup_interruptible() {
277 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
278 setup_interruptible(thread);
279 return thread;
280 }
282 void os::Solaris::try_enable_extended_io() {
283 typedef int (*enable_extended_FILE_stdio_t)(int, int);
285 if (!UseExtendedFileIO) {
286 return;
287 }
289 enable_extended_FILE_stdio_t enabler =
290 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
291 "enable_extended_FILE_stdio");
292 if (enabler) {
293 enabler(-1, -1);
294 }
295 }
298 #ifdef ASSERT
300 JavaThread* os::Solaris::setup_interruptible_native() {
301 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
302 JavaThreadState thread_state = thread->thread_state();
303 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
304 return thread;
305 }
307 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
308 JavaThreadState thread_state = thread->thread_state();
309 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
310 }
311 #endif
313 // cleanup_interruptible reverses the effects of setup_interruptible
314 // setup_interruptible_already_blocked() does not need any cleanup.
316 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
317 OSThread* osthread = thread->osthread();
319 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
320 }
322 // I/O interruption related counters called in _INTERRUPTIBLE
324 void os::Solaris::bump_interrupted_before_count() {
325 RuntimeService::record_interrupted_before_count();
326 }
328 void os::Solaris::bump_interrupted_during_count() {
329 RuntimeService::record_interrupted_during_count();
330 }
332 static int _processors_online = 0;
334 jint os::Solaris::_os_thread_limit = 0;
335 volatile jint os::Solaris::_os_thread_count = 0;
337 julong os::available_memory() {
338 return Solaris::available_memory();
339 }
341 julong os::Solaris::available_memory() {
342 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
343 }
345 julong os::Solaris::_physical_memory = 0;
347 julong os::physical_memory() {
348 return Solaris::physical_memory();
349 }
351 static hrtime_t first_hrtime = 0;
352 static const hrtime_t hrtime_hz = 1000*1000*1000;
353 static volatile hrtime_t max_hrtime = 0;
356 void os::Solaris::initialize_system_info() {
357 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
358 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
359 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
360 }
362 int os::active_processor_count() {
363 // User has overridden the number of active processors
364 if (ActiveProcessorCount > 0) {
365 if (Verbose) {
366 tty->print_cr("active_processor_count: "
367 "active processor count set by user : %d",
368 ActiveProcessorCount);
369 }
370 return ActiveProcessorCount;
371 }
373 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
374 pid_t pid = getpid();
375 psetid_t pset = PS_NONE;
376 // Are we running in a processor set or is there any processor set around?
377 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
378 uint_t pset_cpus;
379 // Query the number of cpus available to us.
380 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
381 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
382 _processors_online = pset_cpus;
383 return pset_cpus;
384 }
385 }
386 // Otherwise return number of online cpus
387 return online_cpus;
388 }
390 static bool find_processors_in_pset(psetid_t pset,
391 processorid_t** id_array,
392 uint_t* id_length) {
393 bool result = false;
394 // Find the number of processors in the processor set.
395 if (pset_info(pset, NULL, id_length, NULL) == 0) {
396 // Make up an array to hold their ids.
397 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
398 // Fill in the array with their processor ids.
399 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
400 result = true;
401 }
402 }
403 return result;
404 }
406 // Callers of find_processors_online() must tolerate imprecise results --
407 // the system configuration can change asynchronously because of DR
408 // or explicit psradm operations.
409 //
410 // We also need to take care that the loop (below) terminates as the
411 // number of processors online can change between the _SC_NPROCESSORS_ONLN
412 // request and the loop that builds the list of processor ids. Unfortunately
413 // there's no reliable way to determine the maximum valid processor id,
414 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
415 // man pages, which claim the processor id set is "sparse, but
416 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
417 // exit the loop.
418 //
419 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
420 // not available on S8.0.
422 static bool find_processors_online(processorid_t** id_array,
423 uint* id_length) {
424 const processorid_t MAX_PROCESSOR_ID = 100000 ;
425 // Find the number of processors online.
426 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
427 // Make up an array to hold their ids.
428 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
429 // Processors need not be numbered consecutively.
430 long found = 0;
431 processorid_t next = 0;
432 while (found < *id_length && next < MAX_PROCESSOR_ID) {
433 processor_info_t info;
434 if (processor_info(next, &info) == 0) {
435 // NB, PI_NOINTR processors are effectively online ...
436 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
437 (*id_array)[found] = next;
438 found += 1;
439 }
440 }
441 next += 1;
442 }
443 if (found < *id_length) {
444 // The loop above didn't identify the expected number of processors.
445 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
446 // and re-running the loop, above, but there's no guarantee of progress
447 // if the system configuration is in flux. Instead, we just return what
448 // we've got. Note that in the worst case find_processors_online() could
449 // return an empty set. (As a fall-back in the case of the empty set we
450 // could just return the ID of the current processor).
451 *id_length = found ;
452 }
454 return true;
455 }
457 static bool assign_distribution(processorid_t* id_array,
458 uint id_length,
459 uint* distribution,
460 uint distribution_length) {
461 // We assume we can assign processorid_t's to uint's.
462 assert(sizeof(processorid_t) == sizeof(uint),
463 "can't convert processorid_t to uint");
464 // Quick check to see if we won't succeed.
465 if (id_length < distribution_length) {
466 return false;
467 }
468 // Assign processor ids to the distribution.
469 // Try to shuffle processors to distribute work across boards,
470 // assuming 4 processors per board.
471 const uint processors_per_board = ProcessDistributionStride;
472 // Find the maximum processor id.
473 processorid_t max_id = 0;
474 for (uint m = 0; m < id_length; m += 1) {
475 max_id = MAX2(max_id, id_array[m]);
476 }
477 // The next id, to limit loops.
478 const processorid_t limit_id = max_id + 1;
479 // Make up markers for available processors.
480 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
481 for (uint c = 0; c < limit_id; c += 1) {
482 available_id[c] = false;
483 }
484 for (uint a = 0; a < id_length; a += 1) {
485 available_id[id_array[a]] = true;
486 }
487 // Step by "boards", then by "slot", copying to "assigned".
488 // NEEDS_CLEANUP: The assignment of processors should be stateful,
489 // remembering which processors have been assigned by
490 // previous calls, etc., so as to distribute several
491 // independent calls of this method. What we'd like is
492 // It would be nice to have an API that let us ask
493 // how many processes are bound to a processor,
494 // but we don't have that, either.
495 // In the short term, "board" is static so that
496 // subsequent distributions don't all start at board 0.
497 static uint board = 0;
498 uint assigned = 0;
499 // Until we've found enough processors ....
500 while (assigned < distribution_length) {
501 // ... find the next available processor in the board.
502 for (uint slot = 0; slot < processors_per_board; slot += 1) {
503 uint try_id = board * processors_per_board + slot;
504 if ((try_id < limit_id) && (available_id[try_id] == true)) {
505 distribution[assigned] = try_id;
506 available_id[try_id] = false;
507 assigned += 1;
508 break;
509 }
510 }
511 board += 1;
512 if (board * processors_per_board + 0 >= limit_id) {
513 board = 0;
514 }
515 }
516 if (available_id != NULL) {
517 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
518 }
519 return true;
520 }
522 void os::set_native_thread_name(const char *name) {
523 if (Solaris::_pthread_setname_np != NULL) {
524 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
525 // but we explicitly copy into a size-limited buffer to avoid any
526 // possible overflow.
527 char buf[32];
528 snprintf(buf, sizeof(buf), "%s", name);
529 buf[sizeof(buf) - 1] = '\0';
530 Solaris::_pthread_setname_np(pthread_self(), buf);
531 }
532 }
534 bool os::distribute_processes(uint length, uint* distribution) {
535 bool result = false;
536 // Find the processor id's of all the available CPUs.
537 processorid_t* id_array = NULL;
538 uint id_length = 0;
539 // There are some races between querying information and using it,
540 // since processor sets can change dynamically.
541 psetid_t pset = PS_NONE;
542 // Are we running in a processor set?
543 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
544 result = find_processors_in_pset(pset, &id_array, &id_length);
545 } else {
546 result = find_processors_online(&id_array, &id_length);
547 }
548 if (result == true) {
549 if (id_length >= length) {
550 result = assign_distribution(id_array, id_length, distribution, length);
551 } else {
552 result = false;
553 }
554 }
555 if (id_array != NULL) {
556 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
557 }
558 return result;
559 }
561 bool os::bind_to_processor(uint processor_id) {
562 // We assume that a processorid_t can be stored in a uint.
563 assert(sizeof(uint) == sizeof(processorid_t),
564 "can't convert uint to processorid_t");
565 int bind_result =
566 processor_bind(P_LWPID, // bind LWP.
567 P_MYID, // bind current LWP.
568 (processorid_t) processor_id, // id.
569 NULL); // don't return old binding.
570 return (bind_result == 0);
571 }
573 bool os::getenv(const char* name, char* buffer, int len) {
574 char* val = ::getenv( name );
575 if ( val == NULL
576 || strlen(val) + 1 > len ) {
577 if (len > 0) buffer[0] = 0; // return a null string
578 return false;
579 }
580 strcpy( buffer, val );
581 return true;
582 }
585 // Return true if user is running as root.
587 bool os::have_special_privileges() {
588 static bool init = false;
589 static bool privileges = false;
590 if (!init) {
591 privileges = (getuid() != geteuid()) || (getgid() != getegid());
592 init = true;
593 }
594 return privileges;
595 }
598 void os::init_system_properties_values() {
599 // The next steps are taken in the product version:
600 //
601 // Obtain the JAVA_HOME value from the location of libjvm.so.
602 // This library should be located at:
603 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
604 //
605 // If "/jre/lib/" appears at the right place in the path, then we
606 // assume libjvm.so is installed in a JDK and we use this path.
607 //
608 // Otherwise exit with message: "Could not create the Java virtual machine."
609 //
610 // The following extra steps are taken in the debugging version:
611 //
612 // If "/jre/lib/" does NOT appear at the right place in the path
613 // instead of exit check for $JAVA_HOME environment variable.
614 //
615 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
616 // then we append a fake suffix "hotspot/libjvm.so" to this path so
617 // it looks like libjvm.so is installed there
618 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
619 //
620 // Otherwise exit.
621 //
622 // Important note: if the location of libjvm.so changes this
623 // code needs to be changed accordingly.
625 // Base path of extensions installed on the system.
626 #define SYS_EXT_DIR "/usr/jdk/packages"
627 #define EXTENSIONS_DIR "/lib/ext"
628 #define ENDORSED_DIR "/lib/endorsed"
630 char cpu_arch[12];
631 // Buffer that fits several sprintfs.
632 // Note that the space for the colon and the trailing null are provided
633 // by the nulls included by the sizeof operator.
634 const size_t bufsize =
635 MAX4((size_t)MAXPATHLEN, // For dll_dir & friends.
636 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
637 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
638 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
639 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
641 // sysclasspath, java_home, dll_dir
642 {
643 char *pslash;
644 os::jvm_path(buf, bufsize);
646 // Found the full path to libjvm.so.
647 // Now cut the path to <java_home>/jre if we can.
648 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
649 pslash = strrchr(buf, '/');
650 if (pslash != NULL) {
651 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
652 }
653 Arguments::set_dll_dir(buf);
655 if (pslash != NULL) {
656 pslash = strrchr(buf, '/');
657 if (pslash != NULL) {
658 *pslash = '\0'; // Get rid of /<arch>.
659 pslash = strrchr(buf, '/');
660 if (pslash != NULL) {
661 *pslash = '\0'; // Get rid of /lib.
662 }
663 }
664 }
665 Arguments::set_java_home(buf);
666 set_boot_path('/', ':');
667 }
669 // Where to look for native libraries.
670 {
671 // Use dlinfo() to determine the correct java.library.path.
672 //
673 // If we're launched by the Java launcher, and the user
674 // does not set java.library.path explicitly on the commandline,
675 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
676 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
677 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
678 // /usr/lib), which is exactly what we want.
679 //
680 // If the user does set java.library.path, it completely
681 // overwrites this setting, and always has.
682 //
683 // If we're not launched by the Java launcher, we may
684 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
685 // settings. Again, dlinfo does exactly what we want.
687 Dl_serinfo info_sz, *info = &info_sz;
688 Dl_serpath *path;
689 char *library_path;
690 char *common_path = buf;
692 // Determine search path count and required buffer size.
693 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
694 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
695 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
696 }
698 // Allocate new buffer and initialize.
699 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
700 info->dls_size = info_sz.dls_size;
701 info->dls_cnt = info_sz.dls_cnt;
703 // Obtain search path information.
704 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
705 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
706 FREE_C_HEAP_ARRAY(char, info, mtInternal);
707 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
708 }
710 path = &info->dls_serpath[0];
712 // Note: Due to a legacy implementation, most of the library path
713 // is set in the launcher. This was to accomodate linking restrictions
714 // on legacy Solaris implementations (which are no longer supported).
715 // Eventually, all the library path setting will be done here.
716 //
717 // However, to prevent the proliferation of improperly built native
718 // libraries, the new path component /usr/jdk/packages is added here.
720 // Determine the actual CPU architecture.
721 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
722 #ifdef _LP64
723 // If we are a 64-bit vm, perform the following translations:
724 // sparc -> sparcv9
725 // i386 -> amd64
726 if (strcmp(cpu_arch, "sparc") == 0) {
727 strcat(cpu_arch, "v9");
728 } else if (strcmp(cpu_arch, "i386") == 0) {
729 strcpy(cpu_arch, "amd64");
730 }
731 #endif
733 // Construct the invariant part of ld_library_path.
734 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
736 // Struct size is more than sufficient for the path components obtained
737 // through the dlinfo() call, so only add additional space for the path
738 // components explicitly added here.
739 size_t library_path_size = info->dls_size + strlen(common_path);
740 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
741 library_path[0] = '\0';
743 // Construct the desired Java library path from the linker's library
744 // search path.
745 //
746 // For compatibility, it is optimal that we insert the additional path
747 // components specific to the Java VM after those components specified
748 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
749 // infrastructure.
750 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
751 strcpy(library_path, common_path);
752 } else {
753 int inserted = 0;
754 int i;
755 for (i = 0; i < info->dls_cnt; i++, path++) {
756 uint_t flags = path->dls_flags & LA_SER_MASK;
757 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
758 strcat(library_path, common_path);
759 strcat(library_path, os::path_separator());
760 inserted = 1;
761 }
762 strcat(library_path, path->dls_name);
763 strcat(library_path, os::path_separator());
764 }
765 // Eliminate trailing path separator.
766 library_path[strlen(library_path)-1] = '\0';
767 }
769 // happens before argument parsing - can't use a trace flag
770 // tty->print_raw("init_system_properties_values: native lib path: ");
771 // tty->print_raw_cr(library_path);
773 // Callee copies into its own buffer.
774 Arguments::set_library_path(library_path);
776 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
777 FREE_C_HEAP_ARRAY(char, info, mtInternal);
778 }
780 // Extensions directories.
781 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
782 Arguments::set_ext_dirs(buf);
784 // Endorsed standards default directory.
785 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
786 Arguments::set_endorsed_dirs(buf);
788 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
790 #undef SYS_EXT_DIR
791 #undef EXTENSIONS_DIR
792 #undef ENDORSED_DIR
793 }
795 void os::breakpoint() {
796 BREAKPOINT;
797 }
799 bool os::obsolete_option(const JavaVMOption *option)
800 {
801 if (!strncmp(option->optionString, "-Xt", 3)) {
802 return true;
803 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
804 return true;
805 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
806 return true;
807 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
808 return true;
809 }
810 return false;
811 }
813 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
814 address stackStart = (address)thread->stack_base();
815 address stackEnd = (address)(stackStart - (address)thread->stack_size());
816 if (sp < stackStart && sp >= stackEnd ) return true;
817 return false;
818 }
820 extern "C" void breakpoint() {
821 // use debugger to set breakpoint here
822 }
824 static thread_t main_thread;
826 // Thread start routine for all new Java threads
827 extern "C" void* java_start(void* thread_addr) {
828 // Try to randomize the cache line index of hot stack frames.
829 // This helps when threads of the same stack traces evict each other's
830 // cache lines. The threads can be either from the same JVM instance, or
831 // from different JVM instances. The benefit is especially true for
832 // processors with hyperthreading technology.
833 static int counter = 0;
834 int pid = os::current_process_id();
835 alloca(((pid ^ counter++) & 7) * 128);
837 int prio;
838 Thread* thread = (Thread*)thread_addr;
839 OSThread* osthr = thread->osthread();
841 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
842 thread->_schedctl = (void *) schedctl_init () ;
844 if (UseNUMA) {
845 int lgrp_id = os::numa_get_group_id();
846 if (lgrp_id != -1) {
847 thread->set_lgrp_id(lgrp_id);
848 }
849 }
851 // If the creator called set priority before we started,
852 // we need to call set_native_priority now that we have an lwp.
853 // We used to get the priority from thr_getprio (we called
854 // thr_setprio way back in create_thread) and pass it to
855 // set_native_priority, but Solaris scales the priority
856 // in java_to_os_priority, so when we read it back here,
857 // we pass trash to set_native_priority instead of what's
858 // in java_to_os_priority. So we save the native priority
859 // in the osThread and recall it here.
861 if ( osthr->thread_id() != -1 ) {
862 if ( UseThreadPriorities ) {
863 int prio = osthr->native_priority();
864 if (ThreadPriorityVerbose) {
865 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
866 INTPTR_FORMAT ", setting priority: %d\n",
867 osthr->thread_id(), osthr->lwp_id(), prio);
868 }
869 os::set_native_priority(thread, prio);
870 }
871 } else if (ThreadPriorityVerbose) {
872 warning("Can't set priority in _start routine, thread id hasn't been set\n");
873 }
875 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
877 // initialize signal mask for this thread
878 os::Solaris::hotspot_sigmask(thread);
880 thread->run();
882 // One less thread is executing
883 // When the VMThread gets here, the main thread may have already exited
884 // which frees the CodeHeap containing the Atomic::dec code
885 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
886 Atomic::dec(&os::Solaris::_os_thread_count);
887 }
889 if (UseDetachedThreads) {
890 thr_exit(NULL);
891 ShouldNotReachHere();
892 }
893 return NULL;
894 }
896 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
897 // Allocate the OSThread object
898 OSThread* osthread = new OSThread(NULL, NULL);
899 if (osthread == NULL) return NULL;
901 // Store info on the Solaris thread into the OSThread
902 osthread->set_thread_id(thread_id);
903 osthread->set_lwp_id(_lwp_self());
904 thread->_schedctl = (void *) schedctl_init () ;
906 if (UseNUMA) {
907 int lgrp_id = os::numa_get_group_id();
908 if (lgrp_id != -1) {
909 thread->set_lgrp_id(lgrp_id);
910 }
911 }
913 if ( ThreadPriorityVerbose ) {
914 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
915 osthread->thread_id(), osthread->lwp_id() );
916 }
918 // Initial thread state is INITIALIZED, not SUSPENDED
919 osthread->set_state(INITIALIZED);
921 return osthread;
922 }
924 void os::Solaris::hotspot_sigmask(Thread* thread) {
926 //Save caller's signal mask
927 sigset_t sigmask;
928 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
929 OSThread *osthread = thread->osthread();
930 osthread->set_caller_sigmask(sigmask);
932 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
933 if (!ReduceSignalUsage) {
934 if (thread->is_VM_thread()) {
935 // Only the VM thread handles BREAK_SIGNAL ...
936 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
937 } else {
938 // ... all other threads block BREAK_SIGNAL
939 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
940 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
941 }
942 }
943 }
945 bool os::create_attached_thread(JavaThread* thread) {
946 #ifdef ASSERT
947 thread->verify_not_published();
948 #endif
949 OSThread* osthread = create_os_thread(thread, thr_self());
950 if (osthread == NULL) {
951 return false;
952 }
954 // Initial thread state is RUNNABLE
955 osthread->set_state(RUNNABLE);
956 thread->set_osthread(osthread);
958 // initialize signal mask for this thread
959 // and save the caller's signal mask
960 os::Solaris::hotspot_sigmask(thread);
962 return true;
963 }
965 bool os::create_main_thread(JavaThread* thread) {
966 #ifdef ASSERT
967 thread->verify_not_published();
968 #endif
969 if (_starting_thread == NULL) {
970 _starting_thread = create_os_thread(thread, main_thread);
971 if (_starting_thread == NULL) {
972 return false;
973 }
974 }
976 // The primodial thread is runnable from the start
977 _starting_thread->set_state(RUNNABLE);
979 thread->set_osthread(_starting_thread);
981 // initialize signal mask for this thread
982 // and save the caller's signal mask
983 os::Solaris::hotspot_sigmask(thread);
985 return true;
986 }
988 // _T2_libthread is true if we believe we are running with the newer
989 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
990 bool os::Solaris::_T2_libthread = false;
992 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
993 // Allocate the OSThread object
994 OSThread* osthread = new OSThread(NULL, NULL);
995 if (osthread == NULL) {
996 return false;
997 }
999 if ( ThreadPriorityVerbose ) {
1000 char *thrtyp;
1001 switch ( thr_type ) {
1002 case vm_thread:
1003 thrtyp = (char *)"vm";
1004 break;
1005 case cgc_thread:
1006 thrtyp = (char *)"cgc";
1007 break;
1008 case pgc_thread:
1009 thrtyp = (char *)"pgc";
1010 break;
1011 case java_thread:
1012 thrtyp = (char *)"java";
1013 break;
1014 case compiler_thread:
1015 thrtyp = (char *)"compiler";
1016 break;
1017 case watcher_thread:
1018 thrtyp = (char *)"watcher";
1019 break;
1020 default:
1021 thrtyp = (char *)"unknown";
1022 break;
1023 }
1024 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1025 }
1027 // Calculate stack size if it's not specified by caller.
1028 if (stack_size == 0) {
1029 // The default stack size 1M (2M for LP64).
1030 stack_size = (BytesPerWord >> 2) * K * K;
1032 switch (thr_type) {
1033 case os::java_thread:
1034 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1035 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1036 break;
1037 case os::compiler_thread:
1038 if (CompilerThreadStackSize > 0) {
1039 stack_size = (size_t)(CompilerThreadStackSize * K);
1040 break;
1041 } // else fall through:
1042 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1043 case os::vm_thread:
1044 case os::pgc_thread:
1045 case os::cgc_thread:
1046 case os::watcher_thread:
1047 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1048 break;
1049 }
1050 }
1051 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1053 // Initial state is ALLOCATED but not INITIALIZED
1054 osthread->set_state(ALLOCATED);
1056 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1057 // We got lots of threads. Check if we still have some address space left.
1058 // Need to be at least 5Mb of unreserved address space. We do check by
1059 // trying to reserve some.
1060 const size_t VirtualMemoryBangSize = 20*K*K;
1061 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1062 if (mem == NULL) {
1063 delete osthread;
1064 return false;
1065 } else {
1066 // Release the memory again
1067 os::release_memory(mem, VirtualMemoryBangSize);
1068 }
1069 }
1071 // Setup osthread because the child thread may need it.
1072 thread->set_osthread(osthread);
1074 // Create the Solaris thread
1075 // explicit THR_BOUND for T2_libthread case in case
1076 // that assumption is not accurate, but our alternate signal stack
1077 // handling is based on it which must have bound threads
1078 thread_t tid = 0;
1079 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1080 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1081 (thr_type == vm_thread) ||
1082 (thr_type == cgc_thread) ||
1083 (thr_type == pgc_thread) ||
1084 (thr_type == compiler_thread && BackgroundCompilation)) ?
1085 THR_BOUND : 0);
1086 int status;
1088 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1089 //
1090 // On multiprocessors systems, libthread sometimes under-provisions our
1091 // process with LWPs. On a 30-way systems, for instance, we could have
1092 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1093 // to our process. This can result in under utilization of PEs.
1094 // I suspect the problem is related to libthread's LWP
1095 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1096 // upcall policy.
1097 //
1098 // The following code is palliative -- it attempts to ensure that our
1099 // process has sufficient LWPs to take advantage of multiple PEs.
1100 // Proper long-term cures include using user-level threads bound to LWPs
1101 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1102 // slight timing window with respect to sampling _os_thread_count, but
1103 // the race is benign. Also, we should periodically recompute
1104 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1105 // the number of PEs in our partition. You might be tempted to use
1106 // THR_NEW_LWP here, but I'd recommend against it as that could
1107 // result in undesirable growth of the libthread's LWP pool.
1108 // The fix below isn't sufficient; for instance, it doesn't take into count
1109 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1110 //
1111 // Some pathologies this scheme doesn't handle:
1112 // * Threads can block, releasing the LWPs. The LWPs can age out.
1113 // When a large number of threads become ready again there aren't
1114 // enough LWPs available to service them. This can occur when the
1115 // number of ready threads oscillates.
1116 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1117 //
1118 // Finally, we should call thr_setconcurrency() periodically to refresh
1119 // the LWP pool and thwart the LWP age-out mechanism.
1120 // The "+3" term provides a little slop -- we want to slightly overprovision.
1122 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1123 if (!(flags & THR_BOUND)) {
1124 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1125 }
1126 }
1127 // Although this doesn't hurt, we should warn of undefined behavior
1128 // when using unbound T1 threads with schedctl(). This should never
1129 // happen, as the compiler and VM threads are always created bound
1130 DEBUG_ONLY(
1131 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1132 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1133 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1134 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1135 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1136 }
1137 );
1140 // Mark that we don't have an lwp or thread id yet.
1141 // In case we attempt to set the priority before the thread starts.
1142 osthread->set_lwp_id(-1);
1143 osthread->set_thread_id(-1);
1145 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1146 if (status != 0) {
1147 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1148 perror("os::create_thread");
1149 }
1150 thread->set_osthread(NULL);
1151 // Need to clean up stuff we've allocated so far
1152 delete osthread;
1153 return false;
1154 }
1156 Atomic::inc(&os::Solaris::_os_thread_count);
1158 // Store info on the Solaris thread into the OSThread
1159 osthread->set_thread_id(tid);
1161 // Remember that we created this thread so we can set priority on it
1162 osthread->set_vm_created();
1164 // Set the default thread priority. If using bound threads, setting
1165 // lwp priority will be delayed until thread start.
1166 set_native_priority(thread,
1167 DefaultThreadPriority == -1 ?
1168 java_to_os_priority[NormPriority] :
1169 DefaultThreadPriority);
1171 // Initial thread state is INITIALIZED, not SUSPENDED
1172 osthread->set_state(INITIALIZED);
1174 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1175 return true;
1176 }
1178 /* defined for >= Solaris 10. This allows builds on earlier versions
1179 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1180 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1181 * and -XX:+UseAltSigs does nothing since these should have no conflict
1182 */
1183 #if !defined(SIGJVM1)
1184 #define SIGJVM1 39
1185 #define SIGJVM2 40
1186 #endif
1188 debug_only(static bool signal_sets_initialized = false);
1189 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1190 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1191 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1193 bool os::Solaris::is_sig_ignored(int sig) {
1194 struct sigaction oact;
1195 sigaction(sig, (struct sigaction*)NULL, &oact);
1196 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1197 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1198 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1199 return true;
1200 else
1201 return false;
1202 }
1204 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1205 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1206 static bool isJVM1available() {
1207 return SIGJVM1 < SIGRTMIN;
1208 }
1210 void os::Solaris::signal_sets_init() {
1211 // Should also have an assertion stating we are still single-threaded.
1212 assert(!signal_sets_initialized, "Already initialized");
1213 // Fill in signals that are necessarily unblocked for all threads in
1214 // the VM. Currently, we unblock the following signals:
1215 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1216 // by -Xrs (=ReduceSignalUsage));
1217 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1218 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1219 // the dispositions or masks wrt these signals.
1220 // Programs embedding the VM that want to use the above signals for their
1221 // own purposes must, at this time, use the "-Xrs" option to prevent
1222 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1223 // (See bug 4345157, and other related bugs).
1224 // In reality, though, unblocking these signals is really a nop, since
1225 // these signals are not blocked by default.
1226 sigemptyset(&unblocked_sigs);
1227 sigemptyset(&allowdebug_blocked_sigs);
1228 sigaddset(&unblocked_sigs, SIGILL);
1229 sigaddset(&unblocked_sigs, SIGSEGV);
1230 sigaddset(&unblocked_sigs, SIGBUS);
1231 sigaddset(&unblocked_sigs, SIGFPE);
1233 if (isJVM1available) {
1234 os::Solaris::set_SIGinterrupt(SIGJVM1);
1235 os::Solaris::set_SIGasync(SIGJVM2);
1236 } else if (UseAltSigs) {
1237 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1238 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1239 } else {
1240 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1241 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1242 }
1244 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1245 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1247 if (!ReduceSignalUsage) {
1248 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1249 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1250 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1251 }
1252 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1253 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1254 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1255 }
1256 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1257 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1258 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1259 }
1260 }
1261 // Fill in signals that are blocked by all but the VM thread.
1262 sigemptyset(&vm_sigs);
1263 if (!ReduceSignalUsage)
1264 sigaddset(&vm_sigs, BREAK_SIGNAL);
1265 debug_only(signal_sets_initialized = true);
1267 // For diagnostics only used in run_periodic_checks
1268 sigemptyset(&check_signal_done);
1269 }
1271 // These are signals that are unblocked while a thread is running Java.
1272 // (For some reason, they get blocked by default.)
1273 sigset_t* os::Solaris::unblocked_signals() {
1274 assert(signal_sets_initialized, "Not initialized");
1275 return &unblocked_sigs;
1276 }
1278 // These are the signals that are blocked while a (non-VM) thread is
1279 // running Java. Only the VM thread handles these signals.
1280 sigset_t* os::Solaris::vm_signals() {
1281 assert(signal_sets_initialized, "Not initialized");
1282 return &vm_sigs;
1283 }
1285 // These are signals that are blocked during cond_wait to allow debugger in
1286 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1287 assert(signal_sets_initialized, "Not initialized");
1288 return &allowdebug_blocked_sigs;
1289 }
1292 void _handle_uncaught_cxx_exception() {
1293 VMError err("An uncaught C++ exception");
1294 err.report_and_die();
1295 }
1298 // First crack at OS-specific initialization, from inside the new thread.
1299 void os::initialize_thread(Thread* thr) {
1300 if (is_primordial_thread()) {
1301 JavaThread* jt = (JavaThread *)thr;
1302 assert(jt != NULL,"Sanity check");
1303 size_t stack_size;
1304 address base = jt->stack_base();
1305 if (Arguments::created_by_java_launcher()) {
1306 // Use 2MB to allow for Solaris 7 64 bit mode.
1307 stack_size = JavaThread::stack_size_at_create() == 0
1308 ? 2048*K : JavaThread::stack_size_at_create();
1310 // There are rare cases when we may have already used more than
1311 // the basic stack size allotment before this method is invoked.
1312 // Attempt to allow for a normally sized java_stack.
1313 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1314 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1315 } else {
1316 // 6269555: If we were not created by a Java launcher, i.e. if we are
1317 // running embedded in a native application, treat the primordial thread
1318 // as much like a native attached thread as possible. This means using
1319 // the current stack size from thr_stksegment(), unless it is too large
1320 // to reliably setup guard pages. A reasonable max size is 8MB.
1321 size_t current_size = current_stack_size();
1322 // This should never happen, but just in case....
1323 if (current_size == 0) current_size = 2 * K * K;
1324 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1325 }
1326 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1327 stack_size = (size_t)(base - bottom);
1329 assert(stack_size > 0, "Stack size calculation problem");
1331 if (stack_size > jt->stack_size()) {
1332 NOT_PRODUCT(
1333 struct rlimit limits;
1334 getrlimit(RLIMIT_STACK, &limits);
1335 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1336 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1337 )
1338 tty->print_cr(
1339 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1340 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1341 "See limit(1) to increase the stack size limit.",
1342 stack_size / K, jt->stack_size() / K);
1343 vm_exit(1);
1344 }
1345 assert(jt->stack_size() >= stack_size,
1346 "Attempt to map more stack than was allocated");
1347 jt->set_stack_size(stack_size);
1348 }
1350 // 5/22/01: Right now alternate signal stacks do not handle
1351 // throwing stack overflow exceptions, see bug 4463178
1352 // Until a fix is found for this, T2 will NOT imply alternate signal
1353 // stacks.
1354 // If using T2 libthread threads, install an alternate signal stack.
1355 // Because alternate stacks associate with LWPs on Solaris,
1356 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1357 // we prefer to explicitly stack bang.
1358 // If not using T2 libthread, but using UseBoundThreads any threads
1359 // (primordial thread, jni_attachCurrentThread) we do not create,
1360 // probably are not bound, therefore they can not have an alternate
1361 // signal stack. Since our stack banging code is generated and
1362 // is shared across threads, all threads must be bound to allow
1363 // using alternate signal stacks. The alternative is to interpose
1364 // on _lwp_create to associate an alt sig stack with each LWP,
1365 // and this could be a problem when the JVM is embedded.
1366 // We would prefer to use alternate signal stacks with T2
1367 // Since there is currently no accurate way to detect T2
1368 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1369 // on installing alternate signal stacks
1372 // 05/09/03: removed alternate signal stack support for Solaris
1373 // The alternate signal stack mechanism is no longer needed to
1374 // handle stack overflow. This is now handled by allocating
1375 // guard pages (red zone) and stackbanging.
1376 // Initially the alternate signal stack mechanism was removed because
1377 // it did not work with T1 llibthread. Alternate
1378 // signal stacks MUST have all threads bound to lwps. Applications
1379 // can create their own threads and attach them without their being
1380 // bound under T1. This is frequently the case for the primordial thread.
1381 // If we were ever to reenable this mechanism we would need to
1382 // use the dynamic check for T2 libthread.
1384 os::Solaris::init_thread_fpu_state();
1385 std::set_terminate(_handle_uncaught_cxx_exception);
1386 }
1390 // Free Solaris resources related to the OSThread
1391 void os::free_thread(OSThread* osthread) {
1392 assert(osthread != NULL, "os::free_thread but osthread not set");
1395 // We are told to free resources of the argument thread,
1396 // but we can only really operate on the current thread.
1397 // The main thread must take the VMThread down synchronously
1398 // before the main thread exits and frees up CodeHeap
1399 guarantee((Thread::current()->osthread() == osthread
1400 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1401 if (Thread::current()->osthread() == osthread) {
1402 // Restore caller's signal mask
1403 sigset_t sigmask = osthread->caller_sigmask();
1404 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1405 }
1406 delete osthread;
1407 }
1409 void os::pd_start_thread(Thread* thread) {
1410 int status = thr_continue(thread->osthread()->thread_id());
1411 assert_status(status == 0, status, "thr_continue failed");
1412 }
1415 intx os::current_thread_id() {
1416 return (intx)thr_self();
1417 }
1419 static pid_t _initial_pid = 0;
1421 int os::current_process_id() {
1422 return (int)(_initial_pid ? _initial_pid : getpid());
1423 }
1425 // gethrtime() should be monotonic according to the documentation,
1426 // but some virtualized platforms are known to break this guarantee.
1427 // getTimeNanos() must be guaranteed not to move backwards, so we
1428 // are forced to add a check here.
1429 inline hrtime_t getTimeNanos() {
1430 const hrtime_t now = gethrtime();
1431 const hrtime_t prev = max_hrtime;
1432 if (now <= prev) {
1433 return prev; // same or retrograde time;
1434 }
1435 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1436 assert(obsv >= prev, "invariant"); // Monotonicity
1437 // If the CAS succeeded then we're done and return "now".
1438 // If the CAS failed and the observed value "obsv" is >= now then
1439 // we should return "obsv". If the CAS failed and now > obsv > prv then
1440 // some other thread raced this thread and installed a new value, in which case
1441 // we could either (a) retry the entire operation, (b) retry trying to install now
1442 // or (c) just return obsv. We use (c). No loop is required although in some cases
1443 // we might discard a higher "now" value in deference to a slightly lower but freshly
1444 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1445 // to (a) or (b) -- and greatly reduces coherence traffic.
1446 // We might also condition (c) on the magnitude of the delta between obsv and now.
1447 // Avoiding excessive CAS operations to hot RW locations is critical.
1448 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1449 return (prev == obsv) ? now : obsv;
1450 }
1452 // Time since start-up in seconds to a fine granularity.
1453 // Used by VMSelfDestructTimer and the MemProfiler.
1454 double os::elapsedTime() {
1455 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1456 }
1458 jlong os::elapsed_counter() {
1459 return (jlong)(getTimeNanos() - first_hrtime);
1460 }
1462 jlong os::elapsed_frequency() {
1463 return hrtime_hz;
1464 }
1466 // Return the real, user, and system times in seconds from an
1467 // arbitrary fixed point in the past.
1468 bool os::getTimesSecs(double* process_real_time,
1469 double* process_user_time,
1470 double* process_system_time) {
1471 struct tms ticks;
1472 clock_t real_ticks = times(&ticks);
1474 if (real_ticks == (clock_t) (-1)) {
1475 return false;
1476 } else {
1477 double ticks_per_second = (double) clock_tics_per_sec;
1478 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1479 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1480 // For consistency return the real time from getTimeNanos()
1481 // converted to seconds.
1482 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1484 return true;
1485 }
1486 }
1488 bool os::supports_vtime() { return true; }
1490 bool os::enable_vtime() {
1491 int fd = ::open("/proc/self/ctl", O_WRONLY);
1492 if (fd == -1)
1493 return false;
1495 long cmd[] = { PCSET, PR_MSACCT };
1496 int res = ::write(fd, cmd, sizeof(long) * 2);
1497 ::close(fd);
1498 if (res != sizeof(long) * 2)
1499 return false;
1501 return true;
1502 }
1504 bool os::vtime_enabled() {
1505 int fd = ::open("/proc/self/status", O_RDONLY);
1506 if (fd == -1)
1507 return false;
1509 pstatus_t status;
1510 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1511 ::close(fd);
1512 if (res != sizeof(pstatus_t))
1513 return false;
1515 return status.pr_flags & PR_MSACCT;
1516 }
1518 double os::elapsedVTime() {
1519 return (double)gethrvtime() / (double)hrtime_hz;
1520 }
1522 // Used internally for comparisons only
1523 // getTimeMillis guaranteed to not move backwards on Solaris
1524 jlong getTimeMillis() {
1525 jlong nanotime = getTimeNanos();
1526 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1527 }
1529 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1530 jlong os::javaTimeMillis() {
1531 timeval t;
1532 if (gettimeofday( &t, NULL) == -1)
1533 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1534 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1535 }
1537 jlong os::javaTimeNanos() {
1538 return (jlong)getTimeNanos();
1539 }
1541 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1542 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1543 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1544 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1545 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1546 }
1548 char * os::local_time_string(char *buf, size_t buflen) {
1549 struct tm t;
1550 time_t long_time;
1551 time(&long_time);
1552 localtime_r(&long_time, &t);
1553 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1554 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1555 t.tm_hour, t.tm_min, t.tm_sec);
1556 return buf;
1557 }
1559 // Note: os::shutdown() might be called very early during initialization, or
1560 // called from signal handler. Before adding something to os::shutdown(), make
1561 // sure it is async-safe and can handle partially initialized VM.
1562 void os::shutdown() {
1564 // allow PerfMemory to attempt cleanup of any persistent resources
1565 perfMemory_exit();
1567 // needs to remove object in file system
1568 AttachListener::abort();
1570 // flush buffered output, finish log files
1571 ostream_abort();
1573 // Check for abort hook
1574 abort_hook_t abort_hook = Arguments::abort_hook();
1575 if (abort_hook != NULL) {
1576 abort_hook();
1577 }
1578 }
1580 // Note: os::abort() might be called very early during initialization, or
1581 // called from signal handler. Before adding something to os::abort(), make
1582 // sure it is async-safe and can handle partially initialized VM.
1583 void os::abort(bool dump_core) {
1584 os::shutdown();
1585 if (dump_core) {
1586 #ifndef PRODUCT
1587 fdStream out(defaultStream::output_fd());
1588 out.print_raw("Current thread is ");
1589 char buf[16];
1590 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1591 out.print_raw_cr(buf);
1592 out.print_raw_cr("Dumping core ...");
1593 #endif
1594 ::abort(); // dump core (for debugging)
1595 }
1597 ::exit(1);
1598 }
1600 // Die immediately, no exit hook, no abort hook, no cleanup.
1601 void os::die() {
1602 ::abort(); // dump core (for debugging)
1603 }
1605 // DLL functions
1607 const char* os::dll_file_extension() { return ".so"; }
1609 // This must be hard coded because it's the system's temporary
1610 // directory not the java application's temp directory, ala java.io.tmpdir.
1611 const char* os::get_temp_directory() { return "/tmp"; }
1613 static bool file_exists(const char* filename) {
1614 struct stat statbuf;
1615 if (filename == NULL || strlen(filename) == 0) {
1616 return false;
1617 }
1618 return os::stat(filename, &statbuf) == 0;
1619 }
1621 bool os::dll_build_name(char* buffer, size_t buflen,
1622 const char* pname, const char* fname) {
1623 bool retval = false;
1624 const size_t pnamelen = pname ? strlen(pname) : 0;
1626 // Return error on buffer overflow.
1627 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1628 return retval;
1629 }
1631 if (pnamelen == 0) {
1632 snprintf(buffer, buflen, "lib%s.so", fname);
1633 retval = true;
1634 } else if (strchr(pname, *os::path_separator()) != NULL) {
1635 int n;
1636 char** pelements = split_path(pname, &n);
1637 if (pelements == NULL) {
1638 return false;
1639 }
1640 for (int i = 0 ; i < n ; i++) {
1641 // really shouldn't be NULL but what the heck, check can't hurt
1642 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1643 continue; // skip the empty path values
1644 }
1645 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1646 if (file_exists(buffer)) {
1647 retval = true;
1648 break;
1649 }
1650 }
1651 // release the storage
1652 for (int i = 0 ; i < n ; i++) {
1653 if (pelements[i] != NULL) {
1654 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1655 }
1656 }
1657 if (pelements != NULL) {
1658 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1659 }
1660 } else {
1661 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1662 retval = true;
1663 }
1664 return retval;
1665 }
1667 // check if addr is inside libjvm.so
1668 bool os::address_is_in_vm(address addr) {
1669 static address libjvm_base_addr;
1670 Dl_info dlinfo;
1672 if (libjvm_base_addr == NULL) {
1673 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1674 libjvm_base_addr = (address)dlinfo.dli_fbase;
1675 }
1676 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1677 }
1679 if (dladdr((void *)addr, &dlinfo) != 0) {
1680 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1681 }
1683 return false;
1684 }
1686 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1687 static dladdr1_func_type dladdr1_func = NULL;
1689 bool os::dll_address_to_function_name(address addr, char *buf,
1690 int buflen, int * offset) {
1691 // buf is not optional, but offset is optional
1692 assert(buf != NULL, "sanity check");
1694 Dl_info dlinfo;
1696 // dladdr1_func was initialized in os::init()
1697 if (dladdr1_func != NULL) {
1698 // yes, we have dladdr1
1700 // Support for dladdr1 is checked at runtime; it may be
1701 // available even if the vm is built on a machine that does
1702 // not have dladdr1 support. Make sure there is a value for
1703 // RTLD_DL_SYMENT.
1704 #ifndef RTLD_DL_SYMENT
1705 #define RTLD_DL_SYMENT 1
1706 #endif
1707 #ifdef _LP64
1708 Elf64_Sym * info;
1709 #else
1710 Elf32_Sym * info;
1711 #endif
1712 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1713 RTLD_DL_SYMENT) != 0) {
1714 // see if we have a matching symbol that covers our address
1715 if (dlinfo.dli_saddr != NULL &&
1716 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1717 if (dlinfo.dli_sname != NULL) {
1718 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1719 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1720 }
1721 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1722 return true;
1723 }
1724 }
1725 // no matching symbol so try for just file info
1726 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1727 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1728 buf, buflen, offset, dlinfo.dli_fname)) {
1729 return true;
1730 }
1731 }
1732 }
1733 buf[0] = '\0';
1734 if (offset != NULL) *offset = -1;
1735 return false;
1736 }
1738 // no, only dladdr is available
1739 if (dladdr((void *)addr, &dlinfo) != 0) {
1740 // see if we have a matching symbol
1741 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1742 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1743 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1744 }
1745 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1746 return true;
1747 }
1748 // no matching symbol so try for just file info
1749 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1750 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1751 buf, buflen, offset, dlinfo.dli_fname)) {
1752 return true;
1753 }
1754 }
1755 }
1756 buf[0] = '\0';
1757 if (offset != NULL) *offset = -1;
1758 return false;
1759 }
1761 bool os::dll_address_to_library_name(address addr, char* buf,
1762 int buflen, int* offset) {
1763 // buf is not optional, but offset is optional
1764 assert(buf != NULL, "sanity check");
1766 Dl_info dlinfo;
1768 if (dladdr((void*)addr, &dlinfo) != 0) {
1769 if (dlinfo.dli_fname != NULL) {
1770 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1771 }
1772 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1773 *offset = addr - (address)dlinfo.dli_fbase;
1774 }
1775 return true;
1776 }
1778 buf[0] = '\0';
1779 if (offset) *offset = -1;
1780 return false;
1781 }
1783 // Prints the names and full paths of all opened dynamic libraries
1784 // for current process
1785 void os::print_dll_info(outputStream * st) {
1786 Dl_info dli;
1787 void *handle;
1788 Link_map *map;
1789 Link_map *p;
1791 st->print_cr("Dynamic libraries:"); st->flush();
1793 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1794 dli.dli_fname == NULL) {
1795 st->print_cr("Error: Cannot print dynamic libraries.");
1796 return;
1797 }
1798 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1799 if (handle == NULL) {
1800 st->print_cr("Error: Cannot print dynamic libraries.");
1801 return;
1802 }
1803 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1804 if (map == NULL) {
1805 st->print_cr("Error: Cannot print dynamic libraries.");
1806 return;
1807 }
1809 while (map->l_prev != NULL)
1810 map = map->l_prev;
1812 while (map != NULL) {
1813 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1814 map = map->l_next;
1815 }
1817 dlclose(handle);
1818 }
1820 // Loads .dll/.so and
1821 // in case of error it checks if .dll/.so was built for the
1822 // same architecture as Hotspot is running on
1824 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1825 {
1826 void * result= ::dlopen(filename, RTLD_LAZY);
1827 if (result != NULL) {
1828 // Successful loading
1829 return result;
1830 }
1832 Elf32_Ehdr elf_head;
1834 // Read system error message into ebuf
1835 // It may or may not be overwritten below
1836 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1837 ebuf[ebuflen-1]='\0';
1838 int diag_msg_max_length=ebuflen-strlen(ebuf);
1839 char* diag_msg_buf=ebuf+strlen(ebuf);
1841 if (diag_msg_max_length==0) {
1842 // No more space in ebuf for additional diagnostics message
1843 return NULL;
1844 }
1847 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1849 if (file_descriptor < 0) {
1850 // Can't open library, report dlerror() message
1851 return NULL;
1852 }
1854 bool failed_to_read_elf_head=
1855 (sizeof(elf_head)!=
1856 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1858 ::close(file_descriptor);
1859 if (failed_to_read_elf_head) {
1860 // file i/o error - report dlerror() msg
1861 return NULL;
1862 }
1864 typedef struct {
1865 Elf32_Half code; // Actual value as defined in elf.h
1866 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1867 char elf_class; // 32 or 64 bit
1868 char endianess; // MSB or LSB
1869 char* name; // String representation
1870 } arch_t;
1872 static const arch_t arch_array[]={
1873 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1874 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1875 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1876 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1877 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1878 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1879 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1880 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1881 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1882 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1883 };
1885 #if (defined IA32)
1886 static Elf32_Half running_arch_code=EM_386;
1887 #elif (defined AMD64)
1888 static Elf32_Half running_arch_code=EM_X86_64;
1889 #elif (defined IA64)
1890 static Elf32_Half running_arch_code=EM_IA_64;
1891 #elif (defined __sparc) && (defined _LP64)
1892 static Elf32_Half running_arch_code=EM_SPARCV9;
1893 #elif (defined __sparc) && (!defined _LP64)
1894 static Elf32_Half running_arch_code=EM_SPARC;
1895 #elif (defined __powerpc64__)
1896 static Elf32_Half running_arch_code=EM_PPC64;
1897 #elif (defined __powerpc__)
1898 static Elf32_Half running_arch_code=EM_PPC;
1899 #elif (defined ARM)
1900 static Elf32_Half running_arch_code=EM_ARM;
1901 #else
1902 #error Method os::dll_load requires that one of following is defined:\
1903 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1904 #endif
1906 // Identify compatability class for VM's architecture and library's architecture
1907 // Obtain string descriptions for architectures
1909 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1910 int running_arch_index=-1;
1912 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
1913 if (running_arch_code == arch_array[i].code) {
1914 running_arch_index = i;
1915 }
1916 if (lib_arch.code == arch_array[i].code) {
1917 lib_arch.compat_class = arch_array[i].compat_class;
1918 lib_arch.name = arch_array[i].name;
1919 }
1920 }
1922 assert(running_arch_index != -1,
1923 "Didn't find running architecture code (running_arch_code) in arch_array");
1924 if (running_arch_index == -1) {
1925 // Even though running architecture detection failed
1926 // we may still continue with reporting dlerror() message
1927 return NULL;
1928 }
1930 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1931 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1932 return NULL;
1933 }
1935 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1936 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1937 return NULL;
1938 }
1940 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1941 if ( lib_arch.name!=NULL ) {
1942 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1943 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1944 lib_arch.name, arch_array[running_arch_index].name);
1945 } else {
1946 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1947 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1948 lib_arch.code,
1949 arch_array[running_arch_index].name);
1950 }
1951 }
1953 return NULL;
1954 }
1956 void* os::dll_lookup(void* handle, const char* name) {
1957 return dlsym(handle, name);
1958 }
1960 void* os::get_default_process_handle() {
1961 return (void*)::dlopen(NULL, RTLD_LAZY);
1962 }
1964 int os::stat(const char *path, struct stat *sbuf) {
1965 char pathbuf[MAX_PATH];
1966 if (strlen(path) > MAX_PATH - 1) {
1967 errno = ENAMETOOLONG;
1968 return -1;
1969 }
1970 os::native_path(strcpy(pathbuf, path));
1971 return ::stat(pathbuf, sbuf);
1972 }
1974 static bool _print_ascii_file(const char* filename, outputStream* st) {
1975 int fd = ::open(filename, O_RDONLY);
1976 if (fd == -1) {
1977 return false;
1978 }
1980 char buf[32];
1981 int bytes;
1982 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1983 st->print_raw(buf, bytes);
1984 }
1986 ::close(fd);
1988 return true;
1989 }
1991 void os::print_os_info_brief(outputStream* st) {
1992 os::Solaris::print_distro_info(st);
1994 os::Posix::print_uname_info(st);
1996 os::Solaris::print_libversion_info(st);
1997 }
1999 void os::print_os_info(outputStream* st) {
2000 st->print("OS:");
2002 os::Solaris::print_distro_info(st);
2004 os::Posix::print_uname_info(st);
2006 os::Solaris::print_libversion_info(st);
2008 os::Posix::print_rlimit_info(st);
2010 os::Posix::print_load_average(st);
2011 }
2013 void os::Solaris::print_distro_info(outputStream* st) {
2014 if (!_print_ascii_file("/etc/release", st)) {
2015 st->print("Solaris");
2016 }
2017 st->cr();
2018 }
2020 void os::Solaris::print_libversion_info(outputStream* st) {
2021 if (os::Solaris::T2_libthread()) {
2022 st->print(" (T2 libthread)");
2023 }
2024 else {
2025 st->print(" (T1 libthread)");
2026 }
2027 st->cr();
2028 }
2030 static bool check_addr0(outputStream* st) {
2031 jboolean status = false;
2032 int fd = ::open("/proc/self/map",O_RDONLY);
2033 if (fd >= 0) {
2034 prmap_t p;
2035 while(::read(fd, &p, sizeof(p)) > 0) {
2036 if (p.pr_vaddr == 0x0) {
2037 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2038 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2039 st->print("Access:");
2040 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2041 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2042 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2043 st->cr();
2044 status = true;
2045 }
2046 }
2047 ::close(fd);
2048 }
2049 return status;
2050 }
2052 void os::pd_print_cpu_info(outputStream* st) {
2053 // Nothing to do for now.
2054 }
2056 void os::print_memory_info(outputStream* st) {
2057 st->print("Memory:");
2058 st->print(" %dk page", os::vm_page_size()>>10);
2059 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2060 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2061 st->cr();
2062 if (VMError::fatal_error_in_progress()) {
2063 (void) check_addr0(st);
2064 }
2065 }
2067 void os::print_siginfo(outputStream* st, void* siginfo) {
2068 const siginfo_t* si = (const siginfo_t*)siginfo;
2070 os::Posix::print_siginfo_brief(st, si);
2072 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2073 UseSharedSpaces) {
2074 FileMapInfo* mapinfo = FileMapInfo::current_info();
2075 if (mapinfo->is_in_shared_space(si->si_addr)) {
2076 st->print("\n\nError accessing class data sharing archive." \
2077 " Mapped file inaccessible during execution, " \
2078 " possible disk/network problem.");
2079 }
2080 }
2081 st->cr();
2082 }
2084 // Moved from whole group, because we need them here for diagnostic
2085 // prints.
2086 #define OLDMAXSIGNUM 32
2087 static int Maxsignum = 0;
2088 static int *ourSigFlags = NULL;
2090 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2092 int os::Solaris::get_our_sigflags(int sig) {
2093 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2094 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2095 return ourSigFlags[sig];
2096 }
2098 void os::Solaris::set_our_sigflags(int sig, int flags) {
2099 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2100 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2101 ourSigFlags[sig] = flags;
2102 }
2105 static const char* get_signal_handler_name(address handler,
2106 char* buf, int buflen) {
2107 int offset;
2108 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2109 if (found) {
2110 // skip directory names
2111 const char *p1, *p2;
2112 p1 = buf;
2113 size_t len = strlen(os::file_separator());
2114 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2115 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2116 } else {
2117 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2118 }
2119 return buf;
2120 }
2122 static void print_signal_handler(outputStream* st, int sig,
2123 char* buf, size_t buflen) {
2124 struct sigaction sa;
2126 sigaction(sig, NULL, &sa);
2128 st->print("%s: ", os::exception_name(sig, buf, buflen));
2130 address handler = (sa.sa_flags & SA_SIGINFO)
2131 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2132 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2134 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2135 st->print("SIG_DFL");
2136 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2137 st->print("SIG_IGN");
2138 } else {
2139 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2140 }
2142 st->print(", sa_mask[0]=");
2143 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2145 address rh = VMError::get_resetted_sighandler(sig);
2146 // May be, handler was resetted by VMError?
2147 if(rh != NULL) {
2148 handler = rh;
2149 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2150 }
2152 st->print(", sa_flags=");
2153 os::Posix::print_sa_flags(st, sa.sa_flags);
2155 // Check: is it our handler?
2156 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2157 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2158 // It is our signal handler
2159 // check for flags
2160 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2161 st->print(
2162 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2163 os::Solaris::get_our_sigflags(sig));
2164 }
2165 }
2166 st->cr();
2167 }
2169 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2170 st->print_cr("Signal Handlers:");
2171 print_signal_handler(st, SIGSEGV, buf, buflen);
2172 print_signal_handler(st, SIGBUS , buf, buflen);
2173 print_signal_handler(st, SIGFPE , buf, buflen);
2174 print_signal_handler(st, SIGPIPE, buf, buflen);
2175 print_signal_handler(st, SIGXFSZ, buf, buflen);
2176 print_signal_handler(st, SIGILL , buf, buflen);
2177 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2178 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2179 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2180 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2181 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2182 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2183 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2184 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2185 }
2187 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2189 // Find the full path to the current module, libjvm.so
2190 void os::jvm_path(char *buf, jint buflen) {
2191 // Error checking.
2192 if (buflen < MAXPATHLEN) {
2193 assert(false, "must use a large-enough buffer");
2194 buf[0] = '\0';
2195 return;
2196 }
2197 // Lazy resolve the path to current module.
2198 if (saved_jvm_path[0] != 0) {
2199 strcpy(buf, saved_jvm_path);
2200 return;
2201 }
2203 Dl_info dlinfo;
2204 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2205 assert(ret != 0, "cannot locate libjvm");
2206 if (ret != 0 && dlinfo.dli_fname != NULL) {
2207 realpath((char *)dlinfo.dli_fname, buf);
2208 } else {
2209 buf[0] = '\0';
2210 return;
2211 }
2213 if (Arguments::created_by_gamma_launcher()) {
2214 // Support for the gamma launcher. Typical value for buf is
2215 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2216 // the right place in the string, then assume we are installed in a JDK and
2217 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2218 // up the path so it looks like libjvm.so is installed there (append a
2219 // fake suffix hotspot/libjvm.so).
2220 const char *p = buf + strlen(buf) - 1;
2221 for (int count = 0; p > buf && count < 5; ++count) {
2222 for (--p; p > buf && *p != '/'; --p)
2223 /* empty */ ;
2224 }
2226 if (strncmp(p, "/jre/lib/", 9) != 0) {
2227 // Look for JAVA_HOME in the environment.
2228 char* java_home_var = ::getenv("JAVA_HOME");
2229 if (java_home_var != NULL && java_home_var[0] != 0) {
2230 char cpu_arch[12];
2231 char* jrelib_p;
2232 int len;
2233 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2234 #ifdef _LP64
2235 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2236 if (strcmp(cpu_arch, "sparc") == 0) {
2237 strcat(cpu_arch, "v9");
2238 } else if (strcmp(cpu_arch, "i386") == 0) {
2239 strcpy(cpu_arch, "amd64");
2240 }
2241 #endif
2242 // Check the current module name "libjvm.so".
2243 p = strrchr(buf, '/');
2244 assert(strstr(p, "/libjvm") == p, "invalid library name");
2246 realpath(java_home_var, buf);
2247 // determine if this is a legacy image or modules image
2248 // modules image doesn't have "jre" subdirectory
2249 len = strlen(buf);
2250 assert(len < buflen, "Ran out of buffer space");
2251 jrelib_p = buf + len;
2252 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2253 if (0 != access(buf, F_OK)) {
2254 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2255 }
2257 if (0 == access(buf, F_OK)) {
2258 // Use current module name "libjvm.so"
2259 len = strlen(buf);
2260 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2261 } else {
2262 // Go back to path of .so
2263 realpath((char *)dlinfo.dli_fname, buf);
2264 }
2265 }
2266 }
2267 }
2269 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2270 }
2273 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2274 // no prefix required, not even "_"
2275 }
2278 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2279 // no suffix required
2280 }
2282 // This method is a copy of JDK's sysGetLastErrorString
2283 // from src/solaris/hpi/src/system_md.c
2285 size_t os::lasterror(char *buf, size_t len) {
2287 if (errno == 0) return 0;
2289 const char *s = ::strerror(errno);
2290 size_t n = ::strlen(s);
2291 if (n >= len) {
2292 n = len - 1;
2293 }
2294 ::strncpy(buf, s, n);
2295 buf[n] = '\0';
2296 return n;
2297 }
2300 // sun.misc.Signal
2302 extern "C" {
2303 static void UserHandler(int sig, void *siginfo, void *context) {
2304 // Ctrl-C is pressed during error reporting, likely because the error
2305 // handler fails to abort. Let VM die immediately.
2306 if (sig == SIGINT && is_error_reported()) {
2307 os::die();
2308 }
2310 os::signal_notify(sig);
2311 // We do not need to reinstate the signal handler each time...
2312 }
2313 }
2315 void* os::user_handler() {
2316 return CAST_FROM_FN_PTR(void*, UserHandler);
2317 }
2319 class Semaphore : public StackObj {
2320 public:
2321 Semaphore();
2322 ~Semaphore();
2323 void signal();
2324 void wait();
2325 bool trywait();
2326 bool timedwait(unsigned int sec, int nsec);
2327 private:
2328 sema_t _semaphore;
2329 };
2332 Semaphore::Semaphore() {
2333 sema_init(&_semaphore, 0, NULL, NULL);
2334 }
2336 Semaphore::~Semaphore() {
2337 sema_destroy(&_semaphore);
2338 }
2340 void Semaphore::signal() {
2341 sema_post(&_semaphore);
2342 }
2344 void Semaphore::wait() {
2345 sema_wait(&_semaphore);
2346 }
2348 bool Semaphore::trywait() {
2349 return sema_trywait(&_semaphore) == 0;
2350 }
2352 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2353 struct timespec ts;
2354 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2356 while (1) {
2357 int result = sema_timedwait(&_semaphore, &ts);
2358 if (result == 0) {
2359 return true;
2360 } else if (errno == EINTR) {
2361 continue;
2362 } else if (errno == ETIME) {
2363 return false;
2364 } else {
2365 return false;
2366 }
2367 }
2368 }
2370 extern "C" {
2371 typedef void (*sa_handler_t)(int);
2372 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2373 }
2375 void* os::signal(int signal_number, void* handler) {
2376 struct sigaction sigAct, oldSigAct;
2377 sigfillset(&(sigAct.sa_mask));
2378 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2379 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2381 if (sigaction(signal_number, &sigAct, &oldSigAct))
2382 // -1 means registration failed
2383 return (void *)-1;
2385 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2386 }
2388 void os::signal_raise(int signal_number) {
2389 raise(signal_number);
2390 }
2392 /*
2393 * The following code is moved from os.cpp for making this
2394 * code platform specific, which it is by its very nature.
2395 */
2397 // a counter for each possible signal value
2398 static int Sigexit = 0;
2399 static int Maxlibjsigsigs;
2400 static jint *pending_signals = NULL;
2401 static int *preinstalled_sigs = NULL;
2402 static struct sigaction *chainedsigactions = NULL;
2403 static sema_t sig_sem;
2404 typedef int (*version_getting_t)();
2405 version_getting_t os::Solaris::get_libjsig_version = NULL;
2406 static int libjsigversion = NULL;
2408 int os::sigexitnum_pd() {
2409 assert(Sigexit > 0, "signal memory not yet initialized");
2410 return Sigexit;
2411 }
2413 void os::Solaris::init_signal_mem() {
2414 // Initialize signal structures
2415 Maxsignum = SIGRTMAX;
2416 Sigexit = Maxsignum+1;
2417 assert(Maxsignum >0, "Unable to obtain max signal number");
2419 Maxlibjsigsigs = Maxsignum;
2421 // pending_signals has one int per signal
2422 // The additional signal is for SIGEXIT - exit signal to signal_thread
2423 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2424 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2426 if (UseSignalChaining) {
2427 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2428 * (Maxsignum + 1), mtInternal);
2429 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2430 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2431 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2432 }
2433 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2434 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2435 }
2437 void os::signal_init_pd() {
2438 int ret;
2440 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2441 assert(ret == 0, "sema_init() failed");
2442 }
2444 void os::signal_notify(int signal_number) {
2445 int ret;
2447 Atomic::inc(&pending_signals[signal_number]);
2448 ret = ::sema_post(&sig_sem);
2449 assert(ret == 0, "sema_post() failed");
2450 }
2452 static int check_pending_signals(bool wait_for_signal) {
2453 int ret;
2454 while (true) {
2455 for (int i = 0; i < Sigexit + 1; i++) {
2456 jint n = pending_signals[i];
2457 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2458 return i;
2459 }
2460 }
2461 if (!wait_for_signal) {
2462 return -1;
2463 }
2464 JavaThread *thread = JavaThread::current();
2465 ThreadBlockInVM tbivm(thread);
2467 bool threadIsSuspended;
2468 do {
2469 thread->set_suspend_equivalent();
2470 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2471 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2472 ;
2473 assert(ret == 0, "sema_wait() failed");
2475 // were we externally suspended while we were waiting?
2476 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2477 if (threadIsSuspended) {
2478 //
2479 // The semaphore has been incremented, but while we were waiting
2480 // another thread suspended us. We don't want to continue running
2481 // while suspended because that would surprise the thread that
2482 // suspended us.
2483 //
2484 ret = ::sema_post(&sig_sem);
2485 assert(ret == 0, "sema_post() failed");
2487 thread->java_suspend_self();
2488 }
2489 } while (threadIsSuspended);
2490 }
2491 }
2493 int os::signal_lookup() {
2494 return check_pending_signals(false);
2495 }
2497 int os::signal_wait() {
2498 return check_pending_signals(true);
2499 }
2501 ////////////////////////////////////////////////////////////////////////////////
2502 // Virtual Memory
2504 static int page_size = -1;
2506 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2507 // clear this var if support is not available.
2508 static bool has_map_align = true;
2510 int os::vm_page_size() {
2511 assert(page_size != -1, "must call os::init");
2512 return page_size;
2513 }
2515 // Solaris allocates memory by pages.
2516 int os::vm_allocation_granularity() {
2517 assert(page_size != -1, "must call os::init");
2518 return page_size;
2519 }
2521 static bool recoverable_mmap_error(int err) {
2522 // See if the error is one we can let the caller handle. This
2523 // list of errno values comes from the Solaris mmap(2) man page.
2524 switch (err) {
2525 case EBADF:
2526 case EINVAL:
2527 case ENOTSUP:
2528 // let the caller deal with these errors
2529 return true;
2531 default:
2532 // Any remaining errors on this OS can cause our reserved mapping
2533 // to be lost. That can cause confusion where different data
2534 // structures think they have the same memory mapped. The worst
2535 // scenario is if both the VM and a library think they have the
2536 // same memory mapped.
2537 return false;
2538 }
2539 }
2541 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2542 int err) {
2543 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2544 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2545 strerror(err), err);
2546 }
2548 static void warn_fail_commit_memory(char* addr, size_t bytes,
2549 size_t alignment_hint, bool exec,
2550 int err) {
2551 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2552 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2553 alignment_hint, exec, strerror(err), err);
2554 }
2556 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2557 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2558 size_t size = bytes;
2559 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2560 if (res != NULL) {
2561 if (UseNUMAInterleaving) {
2562 numa_make_global(addr, bytes);
2563 }
2564 return 0;
2565 }
2567 int err = errno; // save errno from mmap() call in mmap_chunk()
2569 if (!recoverable_mmap_error(err)) {
2570 warn_fail_commit_memory(addr, bytes, exec, err);
2571 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2572 }
2574 return err;
2575 }
2577 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2578 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2579 }
2581 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2582 const char* mesg) {
2583 assert(mesg != NULL, "mesg must be specified");
2584 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2585 if (err != 0) {
2586 // the caller wants all commit errors to exit with the specified mesg:
2587 warn_fail_commit_memory(addr, bytes, exec, err);
2588 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2589 }
2590 }
2592 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2593 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2594 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2595 alignment, (size_t) vm_page_size()));
2597 for (int i = 0; _page_sizes[i] != 0; i++) {
2598 if (is_size_aligned(alignment, _page_sizes[i])) {
2599 return _page_sizes[i];
2600 }
2601 }
2603 return (size_t) vm_page_size();
2604 }
2606 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2607 size_t alignment_hint, bool exec) {
2608 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2609 if (err == 0 && UseLargePages && alignment_hint > 0) {
2610 assert(is_size_aligned(bytes, alignment_hint),
2611 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint));
2613 // The syscall memcntl requires an exact page size (see man memcntl for details).
2614 size_t page_size = page_size_for_alignment(alignment_hint);
2615 if (page_size > (size_t) vm_page_size()) {
2616 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2617 }
2618 }
2619 return err;
2620 }
2622 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2623 bool exec) {
2624 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2625 }
2627 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2628 size_t alignment_hint, bool exec,
2629 const char* mesg) {
2630 assert(mesg != NULL, "mesg must be specified");
2631 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2632 if (err != 0) {
2633 // the caller wants all commit errors to exit with the specified mesg:
2634 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2635 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2636 }
2637 }
2639 // Uncommit the pages in a specified region.
2640 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2641 if (madvise(addr, bytes, MADV_FREE) < 0) {
2642 debug_only(warning("MADV_FREE failed."));
2643 return;
2644 }
2645 }
2647 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2648 return os::commit_memory(addr, size, !ExecMem);
2649 }
2651 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2652 return os::uncommit_memory(addr, size);
2653 }
2655 // Change the page size in a given range.
2656 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2657 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2658 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2659 if (UseLargePages) {
2660 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2661 }
2662 }
2664 // Tell the OS to make the range local to the first-touching LWP
2665 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2666 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2667 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2668 debug_only(warning("MADV_ACCESS_LWP failed."));
2669 }
2670 }
2672 // Tell the OS that this range would be accessed from different LWPs.
2673 void os::numa_make_global(char *addr, size_t bytes) {
2674 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2675 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2676 debug_only(warning("MADV_ACCESS_MANY failed."));
2677 }
2678 }
2680 // Get the number of the locality groups.
2681 size_t os::numa_get_groups_num() {
2682 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2683 return n != -1 ? n : 1;
2684 }
2686 // Get a list of leaf locality groups. A leaf lgroup is group that
2687 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2688 // board. An LWP is assigned to one of these groups upon creation.
2689 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2690 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2691 ids[0] = 0;
2692 return 1;
2693 }
2694 int result_size = 0, top = 1, bottom = 0, cur = 0;
2695 for (int k = 0; k < size; k++) {
2696 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2697 (Solaris::lgrp_id_t*)&ids[top], size - top);
2698 if (r == -1) {
2699 ids[0] = 0;
2700 return 1;
2701 }
2702 if (!r) {
2703 // That's a leaf node.
2704 assert (bottom <= cur, "Sanity check");
2705 // Check if the node has memory
2706 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2707 NULL, 0, LGRP_RSRC_MEM) > 0) {
2708 ids[bottom++] = ids[cur];
2709 }
2710 }
2711 top += r;
2712 cur++;
2713 }
2714 if (bottom == 0) {
2715 // Handle a situation, when the OS reports no memory available.
2716 // Assume UMA architecture.
2717 ids[0] = 0;
2718 return 1;
2719 }
2720 return bottom;
2721 }
2723 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2724 bool os::numa_topology_changed() {
2725 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2726 if (is_stale != -1 && is_stale) {
2727 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2728 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2729 assert(c != 0, "Failure to initialize LGRP API");
2730 Solaris::set_lgrp_cookie(c);
2731 return true;
2732 }
2733 return false;
2734 }
2736 // Get the group id of the current LWP.
2737 int os::numa_get_group_id() {
2738 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2739 if (lgrp_id == -1) {
2740 return 0;
2741 }
2742 const int size = os::numa_get_groups_num();
2743 int *ids = (int*)alloca(size * sizeof(int));
2745 // Get the ids of all lgroups with memory; r is the count.
2746 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2747 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2748 if (r <= 0) {
2749 return 0;
2750 }
2751 return ids[os::random() % r];
2752 }
2754 // Request information about the page.
2755 bool os::get_page_info(char *start, page_info* info) {
2756 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2757 uint64_t addr = (uintptr_t)start;
2758 uint64_t outdata[2];
2759 uint_t validity = 0;
2761 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2762 return false;
2763 }
2765 info->size = 0;
2766 info->lgrp_id = -1;
2768 if ((validity & 1) != 0) {
2769 if ((validity & 2) != 0) {
2770 info->lgrp_id = outdata[0];
2771 }
2772 if ((validity & 4) != 0) {
2773 info->size = outdata[1];
2774 }
2775 return true;
2776 }
2777 return false;
2778 }
2780 // Scan the pages from start to end until a page different than
2781 // the one described in the info parameter is encountered.
2782 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2783 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2784 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2785 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2786 uint_t validity[MAX_MEMINFO_CNT];
2788 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2789 uint64_t p = (uint64_t)start;
2790 while (p < (uint64_t)end) {
2791 addrs[0] = p;
2792 size_t addrs_count = 1;
2793 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2794 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2795 addrs_count++;
2796 }
2798 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2799 return NULL;
2800 }
2802 size_t i = 0;
2803 for (; i < addrs_count; i++) {
2804 if ((validity[i] & 1) != 0) {
2805 if ((validity[i] & 4) != 0) {
2806 if (outdata[types * i + 1] != page_expected->size) {
2807 break;
2808 }
2809 } else
2810 if (page_expected->size != 0) {
2811 break;
2812 }
2814 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2815 if (outdata[types * i] != page_expected->lgrp_id) {
2816 break;
2817 }
2818 }
2819 } else {
2820 return NULL;
2821 }
2822 }
2824 if (i < addrs_count) {
2825 if ((validity[i] & 2) != 0) {
2826 page_found->lgrp_id = outdata[types * i];
2827 } else {
2828 page_found->lgrp_id = -1;
2829 }
2830 if ((validity[i] & 4) != 0) {
2831 page_found->size = outdata[types * i + 1];
2832 } else {
2833 page_found->size = 0;
2834 }
2835 return (char*)addrs[i];
2836 }
2838 p = addrs[addrs_count - 1] + page_size;
2839 }
2840 return end;
2841 }
2843 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2844 size_t size = bytes;
2845 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2846 // uncommitted page. Otherwise, the read/write might succeed if we
2847 // have enough swap space to back the physical page.
2848 return
2849 NULL != Solaris::mmap_chunk(addr, size,
2850 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2851 PROT_NONE);
2852 }
2854 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2855 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2857 if (b == MAP_FAILED) {
2858 return NULL;
2859 }
2860 return b;
2861 }
2863 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2864 char* addr = requested_addr;
2865 int flags = MAP_PRIVATE | MAP_NORESERVE;
2867 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2869 if (fixed) {
2870 flags |= MAP_FIXED;
2871 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2872 flags |= MAP_ALIGN;
2873 addr = (char*) alignment_hint;
2874 }
2876 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2877 // uncommitted page. Otherwise, the read/write might succeed if we
2878 // have enough swap space to back the physical page.
2879 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2880 }
2882 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2883 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2885 guarantee(requested_addr == NULL || requested_addr == addr,
2886 "OS failed to return requested mmap address.");
2887 return addr;
2888 }
2890 // Reserve memory at an arbitrary address, only if that area is
2891 // available (and not reserved for something else).
2893 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2894 const int max_tries = 10;
2895 char* base[max_tries];
2896 size_t size[max_tries];
2898 // Solaris adds a gap between mmap'ed regions. The size of the gap
2899 // is dependent on the requested size and the MMU. Our initial gap
2900 // value here is just a guess and will be corrected later.
2901 bool had_top_overlap = false;
2902 bool have_adjusted_gap = false;
2903 size_t gap = 0x400000;
2905 // Assert only that the size is a multiple of the page size, since
2906 // that's all that mmap requires, and since that's all we really know
2907 // about at this low abstraction level. If we need higher alignment,
2908 // we can either pass an alignment to this method or verify alignment
2909 // in one of the methods further up the call chain. See bug 5044738.
2910 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2912 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2913 // Give it a try, if the kernel honors the hint we can return immediately.
2914 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2916 volatile int err = errno;
2917 if (addr == requested_addr) {
2918 return addr;
2919 } else if (addr != NULL) {
2920 pd_unmap_memory(addr, bytes);
2921 }
2923 if (PrintMiscellaneous && Verbose) {
2924 char buf[256];
2925 buf[0] = '\0';
2926 if (addr == NULL) {
2927 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2928 }
2929 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2930 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2931 "%s", bytes, requested_addr, addr, buf);
2932 }
2934 // Address hint method didn't work. Fall back to the old method.
2935 // In theory, once SNV becomes our oldest supported platform, this
2936 // code will no longer be needed.
2937 //
2938 // Repeatedly allocate blocks until the block is allocated at the
2939 // right spot. Give up after max_tries.
2940 int i;
2941 for (i = 0; i < max_tries; ++i) {
2942 base[i] = reserve_memory(bytes);
2944 if (base[i] != NULL) {
2945 // Is this the block we wanted?
2946 if (base[i] == requested_addr) {
2947 size[i] = bytes;
2948 break;
2949 }
2951 // check that the gap value is right
2952 if (had_top_overlap && !have_adjusted_gap) {
2953 size_t actual_gap = base[i-1] - base[i] - bytes;
2954 if (gap != actual_gap) {
2955 // adjust the gap value and retry the last 2 allocations
2956 assert(i > 0, "gap adjustment code problem");
2957 have_adjusted_gap = true; // adjust the gap only once, just in case
2958 gap = actual_gap;
2959 if (PrintMiscellaneous && Verbose) {
2960 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2961 }
2962 unmap_memory(base[i], bytes);
2963 unmap_memory(base[i-1], size[i-1]);
2964 i-=2;
2965 continue;
2966 }
2967 }
2969 // Does this overlap the block we wanted? Give back the overlapped
2970 // parts and try again.
2971 //
2972 // There is still a bug in this code: if top_overlap == bytes,
2973 // the overlap is offset from requested region by the value of gap.
2974 // In this case giving back the overlapped part will not work,
2975 // because we'll give back the entire block at base[i] and
2976 // therefore the subsequent allocation will not generate a new gap.
2977 // This could be fixed with a new algorithm that used larger
2978 // or variable size chunks to find the requested region -
2979 // but such a change would introduce additional complications.
2980 // It's rare enough that the planets align for this bug,
2981 // so we'll just wait for a fix for 6204603/5003415 which
2982 // will provide a mmap flag to allow us to avoid this business.
2984 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2985 if (top_overlap >= 0 && top_overlap < bytes) {
2986 had_top_overlap = true;
2987 unmap_memory(base[i], top_overlap);
2988 base[i] += top_overlap;
2989 size[i] = bytes - top_overlap;
2990 } else {
2991 size_t bottom_overlap = base[i] + bytes - requested_addr;
2992 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2993 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2994 warning("attempt_reserve_memory_at: possible alignment bug");
2995 }
2996 unmap_memory(requested_addr, bottom_overlap);
2997 size[i] = bytes - bottom_overlap;
2998 } else {
2999 size[i] = bytes;
3000 }
3001 }
3002 }
3003 }
3005 // Give back the unused reserved pieces.
3007 for (int j = 0; j < i; ++j) {
3008 if (base[j] != NULL) {
3009 unmap_memory(base[j], size[j]);
3010 }
3011 }
3013 return (i < max_tries) ? requested_addr : NULL;
3014 }
3016 bool os::pd_release_memory(char* addr, size_t bytes) {
3017 size_t size = bytes;
3018 return munmap(addr, size) == 0;
3019 }
3021 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3022 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3023 "addr must be page aligned");
3024 int retVal = mprotect(addr, bytes, prot);
3025 return retVal == 0;
3026 }
3028 // Protect memory (Used to pass readonly pages through
3029 // JNI GetArray<type>Elements with empty arrays.)
3030 // Also, used for serialization page and for compressed oops null pointer
3031 // checking.
3032 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3033 bool is_committed) {
3034 unsigned int p = 0;
3035 switch (prot) {
3036 case MEM_PROT_NONE: p = PROT_NONE; break;
3037 case MEM_PROT_READ: p = PROT_READ; break;
3038 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3039 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3040 default:
3041 ShouldNotReachHere();
3042 }
3043 // is_committed is unused.
3044 return solaris_mprotect(addr, bytes, p);
3045 }
3047 // guard_memory and unguard_memory only happens within stack guard pages.
3048 // Since ISM pertains only to the heap, guard and unguard memory should not
3049 /// happen with an ISM region.
3050 bool os::guard_memory(char* addr, size_t bytes) {
3051 return solaris_mprotect(addr, bytes, PROT_NONE);
3052 }
3054 bool os::unguard_memory(char* addr, size_t bytes) {
3055 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3056 }
3058 // Large page support
3059 static size_t _large_page_size = 0;
3061 // Insertion sort for small arrays (descending order).
3062 static void insertion_sort_descending(size_t* array, int len) {
3063 for (int i = 0; i < len; i++) {
3064 size_t val = array[i];
3065 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3066 size_t tmp = array[key];
3067 array[key] = array[key - 1];
3068 array[key - 1] = tmp;
3069 }
3070 }
3071 }
3073 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3074 const unsigned int usable_count = VM_Version::page_size_count();
3075 if (usable_count == 1) {
3076 return false;
3077 }
3079 // Find the right getpagesizes interface. When solaris 11 is the minimum
3080 // build platform, getpagesizes() (without the '2') can be called directly.
3081 typedef int (*gps_t)(size_t[], int);
3082 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3083 if (gps_func == NULL) {
3084 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3085 if (gps_func == NULL) {
3086 if (warn) {
3087 warning("MPSS is not supported by the operating system.");
3088 }
3089 return false;
3090 }
3091 }
3093 // Fill the array of page sizes.
3094 int n = (*gps_func)(_page_sizes, page_sizes_max);
3095 assert(n > 0, "Solaris bug?");
3097 if (n == page_sizes_max) {
3098 // Add a sentinel value (necessary only if the array was completely filled
3099 // since it is static (zeroed at initialization)).
3100 _page_sizes[--n] = 0;
3101 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3102 }
3103 assert(_page_sizes[n] == 0, "missing sentinel");
3104 trace_page_sizes("available page sizes", _page_sizes, n);
3106 if (n == 1) return false; // Only one page size available.
3108 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3109 // select up to usable_count elements. First sort the array, find the first
3110 // acceptable value, then copy the usable sizes to the top of the array and
3111 // trim the rest. Make sure to include the default page size :-).
3112 //
3113 // A better policy could get rid of the 4M limit by taking the sizes of the
3114 // important VM memory regions (java heap and possibly the code cache) into
3115 // account.
3116 insertion_sort_descending(_page_sizes, n);
3117 const size_t size_limit =
3118 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3119 int beg;
3120 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3121 const int end = MIN2((int)usable_count, n) - 1;
3122 for (int cur = 0; cur < end; ++cur, ++beg) {
3123 _page_sizes[cur] = _page_sizes[beg];
3124 }
3125 _page_sizes[end] = vm_page_size();
3126 _page_sizes[end + 1] = 0;
3128 if (_page_sizes[end] > _page_sizes[end - 1]) {
3129 // Default page size is not the smallest; sort again.
3130 insertion_sort_descending(_page_sizes, end + 1);
3131 }
3132 *page_size = _page_sizes[0];
3134 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3135 return true;
3136 }
3138 void os::large_page_init() {
3139 if (UseLargePages) {
3140 // print a warning if any large page related flag is specified on command line
3141 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3142 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3144 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3145 }
3146 }
3148 bool os::Solaris::is_valid_page_size(size_t bytes) {
3149 for (int i = 0; _page_sizes[i] != 0; i++) {
3150 if (_page_sizes[i] == bytes) {
3151 return true;
3152 }
3153 }
3154 return false;
3155 }
3157 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3158 assert(is_valid_page_size(align), err_msg(SIZE_FORMAT " is not a valid page size", align));
3159 assert(is_ptr_aligned((void*) start, align),
3160 err_msg(PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align));
3161 assert(is_size_aligned(bytes, align),
3162 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align));
3164 // Signal to OS that we want large pages for addresses
3165 // from addr, addr + bytes
3166 struct memcntl_mha mpss_struct;
3167 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3168 mpss_struct.mha_pagesize = align;
3169 mpss_struct.mha_flags = 0;
3170 // Upon successful completion, memcntl() returns 0
3171 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3172 debug_only(warning("Attempt to use MPSS failed."));
3173 return false;
3174 }
3175 return true;
3176 }
3178 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3179 fatal("os::reserve_memory_special should not be called on Solaris.");
3180 return NULL;
3181 }
3183 bool os::release_memory_special(char* base, size_t bytes) {
3184 fatal("os::release_memory_special should not be called on Solaris.");
3185 return false;
3186 }
3188 size_t os::large_page_size() {
3189 return _large_page_size;
3190 }
3192 // MPSS allows application to commit large page memory on demand; with ISM
3193 // the entire memory region must be allocated as shared memory.
3194 bool os::can_commit_large_page_memory() {
3195 return true;
3196 }
3198 bool os::can_execute_large_page_memory() {
3199 return true;
3200 }
3202 static int os_sleep(jlong millis, bool interruptible) {
3203 const jlong limit = INT_MAX;
3204 jlong prevtime;
3205 int res;
3207 while (millis > limit) {
3208 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3209 return res;
3210 millis -= limit;
3211 }
3213 // Restart interrupted polls with new parameters until the proper delay
3214 // has been completed.
3216 prevtime = getTimeMillis();
3218 while (millis > 0) {
3219 jlong newtime;
3221 if (!interruptible) {
3222 // Following assert fails for os::yield_all:
3223 // assert(!thread->is_Java_thread(), "must not be java thread");
3224 res = poll(NULL, 0, millis);
3225 } else {
3226 JavaThread *jt = JavaThread::current();
3228 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3229 os::Solaris::clear_interrupted);
3230 }
3232 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3233 // thread.Interrupt.
3235 // See c/r 6751923. Poll can return 0 before time
3236 // has elapsed if time is set via clock_settime (as NTP does).
3237 // res == 0 if poll timed out (see man poll RETURN VALUES)
3238 // using the logic below checks that we really did
3239 // sleep at least "millis" if not we'll sleep again.
3240 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3241 newtime = getTimeMillis();
3242 assert(newtime >= prevtime, "time moving backwards");
3243 /* Doing prevtime and newtime in microseconds doesn't help precision,
3244 and trying to round up to avoid lost milliseconds can result in a
3245 too-short delay. */
3246 millis -= newtime - prevtime;
3247 if(millis <= 0)
3248 return OS_OK;
3249 prevtime = newtime;
3250 } else
3251 return res;
3252 }
3254 return OS_OK;
3255 }
3257 // Read calls from inside the vm need to perform state transitions
3258 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3259 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3260 }
3262 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3263 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3264 }
3266 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3267 assert(thread == Thread::current(), "thread consistency check");
3269 // TODO-FIXME: this should be removed.
3270 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3271 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3272 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3273 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3274 // is fooled into believing that the system is making progress. In the code below we block the
3275 // the watcher thread while safepoint is in progress so that it would not appear as though the
3276 // system is making progress.
3277 if (!Solaris::T2_libthread() &&
3278 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3279 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3280 // the entire safepoint, the watcher thread will line up here during the safepoint.
3281 Threads_lock->lock_without_safepoint_check();
3282 Threads_lock->unlock();
3283 }
3285 if (thread->is_Java_thread()) {
3286 // This is a JavaThread so we honor the _thread_blocked protocol
3287 // even for sleeps of 0 milliseconds. This was originally done
3288 // as a workaround for bug 4338139. However, now we also do it
3289 // to honor the suspend-equivalent protocol.
3291 JavaThread *jt = (JavaThread *) thread;
3292 ThreadBlockInVM tbivm(jt);
3294 jt->set_suspend_equivalent();
3295 // cleared by handle_special_suspend_equivalent_condition() or
3296 // java_suspend_self() via check_and_wait_while_suspended()
3298 int ret_code;
3299 if (millis <= 0) {
3300 thr_yield();
3301 ret_code = 0;
3302 } else {
3303 // The original sleep() implementation did not create an
3304 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3305 // I'm preserving that decision for now.
3306 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3308 ret_code = os_sleep(millis, interruptible);
3309 }
3311 // were we externally suspended while we were waiting?
3312 jt->check_and_wait_while_suspended();
3314 return ret_code;
3315 }
3317 // non-JavaThread from this point on:
3319 if (millis <= 0) {
3320 thr_yield();
3321 return 0;
3322 }
3324 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3326 return os_sleep(millis, interruptible);
3327 }
3329 void os::naked_short_sleep(jlong ms) {
3330 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3332 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3333 // Solaris requires -lrt for this.
3334 usleep((ms * 1000));
3336 return;
3337 }
3339 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3340 void os::infinite_sleep() {
3341 while (true) { // sleep forever ...
3342 ::sleep(100); // ... 100 seconds at a time
3343 }
3344 }
3346 // Used to convert frequent JVM_Yield() to nops
3347 bool os::dont_yield() {
3348 if (DontYieldALot) {
3349 static hrtime_t last_time = 0;
3350 hrtime_t diff = getTimeNanos() - last_time;
3352 if (diff < DontYieldALotInterval * 1000000)
3353 return true;
3355 last_time += diff;
3357 return false;
3358 }
3359 else {
3360 return false;
3361 }
3362 }
3364 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3365 // the linux and win32 implementations do not. This should be checked.
3367 void os::yield() {
3368 // Yields to all threads with same or greater priority
3369 os::sleep(Thread::current(), 0, false);
3370 }
3372 // Note that yield semantics are defined by the scheduling class to which
3373 // the thread currently belongs. Typically, yield will _not yield to
3374 // other equal or higher priority threads that reside on the dispatch queues
3375 // of other CPUs.
3377 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3380 // On Solaris we found that yield_all doesn't always yield to all other threads.
3381 // There have been cases where there is a thread ready to execute but it doesn't
3382 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3383 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3384 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3385 // number of times yield_all is called in the one loop and increase the sleep
3386 // time after 8 attempts. If this fails too we increase the concurrency level
3387 // so that the starving thread would get an lwp
3389 void os::yield_all(int attempts) {
3390 // Yields to all threads, including threads with lower priorities
3391 if (attempts == 0) {
3392 os::sleep(Thread::current(), 1, false);
3393 } else {
3394 int iterations = attempts % 30;
3395 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3396 // thr_setconcurrency and _getconcurrency make sense only under T1.
3397 int noofLWPS = thr_getconcurrency();
3398 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3399 thr_setconcurrency(thr_getconcurrency() + 1);
3400 }
3401 } else if (iterations < 25) {
3402 os::sleep(Thread::current(), 1, false);
3403 } else {
3404 os::sleep(Thread::current(), 10, false);
3405 }
3406 }
3407 }
3409 // Called from the tight loops to possibly influence time-sharing heuristics
3410 void os::loop_breaker(int attempts) {
3411 os::yield_all(attempts);
3412 }
3415 // Interface for setting lwp priorities. If we are using T2 libthread,
3416 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3417 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3418 // function is meaningless in this mode so we must adjust the real lwp's priority
3419 // The routines below implement the getting and setting of lwp priorities.
3420 //
3421 // Note: There are three priority scales used on Solaris. Java priotities
3422 // which range from 1 to 10, libthread "thr_setprio" scale which range
3423 // from 0 to 127, and the current scheduling class of the process we
3424 // are running in. This is typically from -60 to +60.
3425 // The setting of the lwp priorities in done after a call to thr_setprio
3426 // so Java priorities are mapped to libthread priorities and we map from
3427 // the latter to lwp priorities. We don't keep priorities stored in
3428 // Java priorities since some of our worker threads want to set priorities
3429 // higher than all Java threads.
3430 //
3431 // For related information:
3432 // (1) man -s 2 priocntl
3433 // (2) man -s 4 priocntl
3434 // (3) man dispadmin
3435 // = librt.so
3436 // = libthread/common/rtsched.c - thrp_setlwpprio().
3437 // = ps -cL <pid> ... to validate priority.
3438 // = sched_get_priority_min and _max
3439 // pthread_create
3440 // sched_setparam
3441 // pthread_setschedparam
3442 //
3443 // Assumptions:
3444 // + We assume that all threads in the process belong to the same
3445 // scheduling class. IE. an homogenous process.
3446 // + Must be root or in IA group to change change "interactive" attribute.
3447 // Priocntl() will fail silently. The only indication of failure is when
3448 // we read-back the value and notice that it hasn't changed.
3449 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3450 // + For RT, change timeslice as well. Invariant:
3451 // constant "priority integral"
3452 // Konst == TimeSlice * (60-Priority)
3453 // Given a priority, compute appropriate timeslice.
3454 // + Higher numerical values have higher priority.
3456 // sched class attributes
3457 typedef struct {
3458 int schedPolicy; // classID
3459 int maxPrio;
3460 int minPrio;
3461 } SchedInfo;
3464 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3466 #ifdef ASSERT
3467 static int ReadBackValidate = 1;
3468 #endif
3469 static int myClass = 0;
3470 static int myMin = 0;
3471 static int myMax = 0;
3472 static int myCur = 0;
3473 static bool priocntl_enable = false;
3475 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3476 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3479 // lwp_priocntl_init
3480 //
3481 // Try to determine the priority scale for our process.
3482 //
3483 // Return errno or 0 if OK.
3484 //
3485 static int lwp_priocntl_init () {
3486 int rslt;
3487 pcinfo_t ClassInfo;
3488 pcparms_t ParmInfo;
3489 int i;
3491 if (!UseThreadPriorities) return 0;
3493 // We are using Bound threads, we need to determine our priority ranges
3494 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3495 // If ThreadPriorityPolicy is 1, switch tables
3496 if (ThreadPriorityPolicy == 1) {
3497 for (i = 0 ; i < CriticalPriority+1; i++)
3498 os::java_to_os_priority[i] = prio_policy1[i];
3499 }
3500 if (UseCriticalJavaThreadPriority) {
3501 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3502 // See set_native_priority() and set_lwp_class_and_priority().
3503 // Save original MaxPriority mapping in case attempt to
3504 // use critical priority fails.
3505 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3506 // Set negative to distinguish from other priorities
3507 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3508 }
3509 }
3510 // Not using Bound Threads, set to ThreadPolicy 1
3511 else {
3512 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3513 os::java_to_os_priority[i] = prio_policy1[i];
3514 }
3515 return 0;
3516 }
3518 // Get IDs for a set of well-known scheduling classes.
3519 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3520 // the system. We should have a loop that iterates over the
3521 // classID values, which are known to be "small" integers.
3523 strcpy(ClassInfo.pc_clname, "TS");
3524 ClassInfo.pc_cid = -1;
3525 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3526 if (rslt < 0) return errno;
3527 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3528 tsLimits.schedPolicy = ClassInfo.pc_cid;
3529 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3530 tsLimits.minPrio = -tsLimits.maxPrio;
3532 strcpy(ClassInfo.pc_clname, "IA");
3533 ClassInfo.pc_cid = -1;
3534 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3535 if (rslt < 0) return errno;
3536 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3537 iaLimits.schedPolicy = ClassInfo.pc_cid;
3538 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3539 iaLimits.minPrio = -iaLimits.maxPrio;
3541 strcpy(ClassInfo.pc_clname, "RT");
3542 ClassInfo.pc_cid = -1;
3543 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3544 if (rslt < 0) return errno;
3545 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3546 rtLimits.schedPolicy = ClassInfo.pc_cid;
3547 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3548 rtLimits.minPrio = 0;
3550 strcpy(ClassInfo.pc_clname, "FX");
3551 ClassInfo.pc_cid = -1;
3552 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3553 if (rslt < 0) return errno;
3554 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3555 fxLimits.schedPolicy = ClassInfo.pc_cid;
3556 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3557 fxLimits.minPrio = 0;
3559 // Query our "current" scheduling class.
3560 // This will normally be IA, TS or, rarely, FX or RT.
3561 memset(&ParmInfo, 0, sizeof(ParmInfo));
3562 ParmInfo.pc_cid = PC_CLNULL;
3563 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3564 if (rslt < 0) return errno;
3565 myClass = ParmInfo.pc_cid;
3567 // We now know our scheduling classId, get specific information
3568 // about the class.
3569 ClassInfo.pc_cid = myClass;
3570 ClassInfo.pc_clname[0] = 0;
3571 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3572 if (rslt < 0) return errno;
3574 if (ThreadPriorityVerbose) {
3575 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3576 }
3578 memset(&ParmInfo, 0, sizeof(pcparms_t));
3579 ParmInfo.pc_cid = PC_CLNULL;
3580 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3581 if (rslt < 0) return errno;
3583 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3584 myMin = rtLimits.minPrio;
3585 myMax = rtLimits.maxPrio;
3586 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3587 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3588 myMin = iaLimits.minPrio;
3589 myMax = iaLimits.maxPrio;
3590 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3591 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3592 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3593 myMin = tsLimits.minPrio;
3594 myMax = tsLimits.maxPrio;
3595 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3596 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3597 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3598 myMin = fxLimits.minPrio;
3599 myMax = fxLimits.maxPrio;
3600 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3601 } else {
3602 // No clue - punt
3603 if (ThreadPriorityVerbose)
3604 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3605 return EINVAL; // no clue, punt
3606 }
3608 if (ThreadPriorityVerbose) {
3609 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3610 }
3612 priocntl_enable = true; // Enable changing priorities
3613 return 0;
3614 }
3616 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3617 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3618 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3619 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3622 // scale_to_lwp_priority
3623 //
3624 // Convert from the libthread "thr_setprio" scale to our current
3625 // lwp scheduling class scale.
3626 //
3627 static
3628 int scale_to_lwp_priority (int rMin, int rMax, int x)
3629 {
3630 int v;
3632 if (x == 127) return rMax; // avoid round-down
3633 v = (((x*(rMax-rMin)))/128)+rMin;
3634 return v;
3635 }
3638 // set_lwp_class_and_priority
3639 //
3640 // Set the class and priority of the lwp. This call should only
3641 // be made when using bound threads (T2 threads are bound by default).
3642 //
3643 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3644 int newPrio, int new_class, bool scale) {
3645 int rslt;
3646 int Actual, Expected, prv;
3647 pcparms_t ParmInfo; // for GET-SET
3648 #ifdef ASSERT
3649 pcparms_t ReadBack; // for readback
3650 #endif
3652 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3653 // Query current values.
3654 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3655 // Cache "pcparms_t" in global ParmCache.
3656 // TODO: elide set-to-same-value
3658 // If something went wrong on init, don't change priorities.
3659 if ( !priocntl_enable ) {
3660 if (ThreadPriorityVerbose)
3661 tty->print_cr("Trying to set priority but init failed, ignoring");
3662 return EINVAL;
3663 }
3665 // If lwp hasn't started yet, just return
3666 // the _start routine will call us again.
3667 if ( lwpid <= 0 ) {
3668 if (ThreadPriorityVerbose) {
3669 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3670 INTPTR_FORMAT " to %d, lwpid not set",
3671 ThreadID, newPrio);
3672 }
3673 return 0;
3674 }
3676 if (ThreadPriorityVerbose) {
3677 tty->print_cr ("set_lwp_class_and_priority("
3678 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3679 ThreadID, lwpid, newPrio);
3680 }
3682 memset(&ParmInfo, 0, sizeof(pcparms_t));
3683 ParmInfo.pc_cid = PC_CLNULL;
3684 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3685 if (rslt < 0) return errno;
3687 int cur_class = ParmInfo.pc_cid;
3688 ParmInfo.pc_cid = (id_t)new_class;
3690 if (new_class == rtLimits.schedPolicy) {
3691 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3692 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3693 rtLimits.maxPrio, newPrio)
3694 : newPrio;
3695 rtInfo->rt_tqsecs = RT_NOCHANGE;
3696 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3697 if (ThreadPriorityVerbose) {
3698 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3699 }
3700 } else if (new_class == iaLimits.schedPolicy) {
3701 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3702 int maxClamped = MIN2(iaLimits.maxPrio,
3703 cur_class == new_class
3704 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3705 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3706 maxClamped, newPrio)
3707 : newPrio;
3708 iaInfo->ia_uprilim = cur_class == new_class
3709 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3710 iaInfo->ia_mode = IA_NOCHANGE;
3711 if (ThreadPriorityVerbose) {
3712 tty->print_cr("IA: [%d...%d] %d->%d\n",
3713 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3714 }
3715 } else if (new_class == tsLimits.schedPolicy) {
3716 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3717 int maxClamped = MIN2(tsLimits.maxPrio,
3718 cur_class == new_class
3719 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3720 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3721 maxClamped, newPrio)
3722 : newPrio;
3723 tsInfo->ts_uprilim = cur_class == new_class
3724 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3725 if (ThreadPriorityVerbose) {
3726 tty->print_cr("TS: [%d...%d] %d->%d\n",
3727 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3728 }
3729 } else if (new_class == fxLimits.schedPolicy) {
3730 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3731 int maxClamped = MIN2(fxLimits.maxPrio,
3732 cur_class == new_class
3733 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3734 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3735 maxClamped, newPrio)
3736 : newPrio;
3737 fxInfo->fx_uprilim = cur_class == new_class
3738 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3739 fxInfo->fx_tqsecs = FX_NOCHANGE;
3740 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3741 if (ThreadPriorityVerbose) {
3742 tty->print_cr("FX: [%d...%d] %d->%d\n",
3743 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3744 }
3745 } else {
3746 if (ThreadPriorityVerbose) {
3747 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3748 }
3749 return EINVAL; // no clue, punt
3750 }
3752 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3753 if (ThreadPriorityVerbose && rslt) {
3754 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3755 }
3756 if (rslt < 0) return errno;
3758 #ifdef ASSERT
3759 // Sanity check: read back what we just attempted to set.
3760 // In theory it could have changed in the interim ...
3761 //
3762 // The priocntl system call is tricky.
3763 // Sometimes it'll validate the priority value argument and
3764 // return EINVAL if unhappy. At other times it fails silently.
3765 // Readbacks are prudent.
3767 if (!ReadBackValidate) return 0;
3769 memset(&ReadBack, 0, sizeof(pcparms_t));
3770 ReadBack.pc_cid = PC_CLNULL;
3771 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3772 assert(rslt >= 0, "priocntl failed");
3773 Actual = Expected = 0xBAD;
3774 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3775 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3776 Actual = RTPRI(ReadBack)->rt_pri;
3777 Expected = RTPRI(ParmInfo)->rt_pri;
3778 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3779 Actual = IAPRI(ReadBack)->ia_upri;
3780 Expected = IAPRI(ParmInfo)->ia_upri;
3781 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3782 Actual = TSPRI(ReadBack)->ts_upri;
3783 Expected = TSPRI(ParmInfo)->ts_upri;
3784 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3785 Actual = FXPRI(ReadBack)->fx_upri;
3786 Expected = FXPRI(ParmInfo)->fx_upri;
3787 } else {
3788 if (ThreadPriorityVerbose) {
3789 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3790 ParmInfo.pc_cid);
3791 }
3792 }
3794 if (Actual != Expected) {
3795 if (ThreadPriorityVerbose) {
3796 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3797 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3798 }
3799 }
3800 #endif
3802 return 0;
3803 }
3805 // Solaris only gives access to 128 real priorities at a time,
3806 // so we expand Java's ten to fill this range. This would be better
3807 // if we dynamically adjusted relative priorities.
3808 //
3809 // The ThreadPriorityPolicy option allows us to select 2 different
3810 // priority scales.
3811 //
3812 // ThreadPriorityPolicy=0
3813 // Since the Solaris' default priority is MaximumPriority, we do not
3814 // set a priority lower than Max unless a priority lower than
3815 // NormPriority is requested.
3816 //
3817 // ThreadPriorityPolicy=1
3818 // This mode causes the priority table to get filled with
3819 // linear values. NormPriority get's mapped to 50% of the
3820 // Maximum priority an so on. This will cause VM threads
3821 // to get unfair treatment against other Solaris processes
3822 // which do not explicitly alter their thread priorities.
3823 //
3825 int os::java_to_os_priority[CriticalPriority + 1] = {
3826 -99999, // 0 Entry should never be used
3828 0, // 1 MinPriority
3829 32, // 2
3830 64, // 3
3832 96, // 4
3833 127, // 5 NormPriority
3834 127, // 6
3836 127, // 7
3837 127, // 8
3838 127, // 9 NearMaxPriority
3840 127, // 10 MaxPriority
3842 -criticalPrio // 11 CriticalPriority
3843 };
3845 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3846 OSThread* osthread = thread->osthread();
3848 // Save requested priority in case the thread hasn't been started
3849 osthread->set_native_priority(newpri);
3851 // Check for critical priority request
3852 bool fxcritical = false;
3853 if (newpri == -criticalPrio) {
3854 fxcritical = true;
3855 newpri = criticalPrio;
3856 }
3858 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3859 if (!UseThreadPriorities) return OS_OK;
3861 int status = 0;
3863 if (!fxcritical) {
3864 // Use thr_setprio only if we have a priority that thr_setprio understands
3865 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3866 }
3868 if (os::Solaris::T2_libthread() ||
3869 (UseBoundThreads && osthread->is_vm_created())) {
3870 int lwp_status =
3871 set_lwp_class_and_priority(osthread->thread_id(),
3872 osthread->lwp_id(),
3873 newpri,
3874 fxcritical ? fxLimits.schedPolicy : myClass,
3875 !fxcritical);
3876 if (lwp_status != 0 && fxcritical) {
3877 // Try again, this time without changing the scheduling class
3878 newpri = java_MaxPriority_to_os_priority;
3879 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3880 osthread->lwp_id(),
3881 newpri, myClass, false);
3882 }
3883 status |= lwp_status;
3884 }
3885 return (status == 0) ? OS_OK : OS_ERR;
3886 }
3889 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3890 int p;
3891 if ( !UseThreadPriorities ) {
3892 *priority_ptr = NormalPriority;
3893 return OS_OK;
3894 }
3895 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3896 if (status != 0) {
3897 return OS_ERR;
3898 }
3899 *priority_ptr = p;
3900 return OS_OK;
3901 }
3904 // Hint to the underlying OS that a task switch would not be good.
3905 // Void return because it's a hint and can fail.
3906 void os::hint_no_preempt() {
3907 schedctl_start(schedctl_init());
3908 }
3910 static void resume_clear_context(OSThread *osthread) {
3911 osthread->set_ucontext(NULL);
3912 }
3914 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3915 osthread->set_ucontext(context);
3916 }
3918 static Semaphore sr_semaphore;
3920 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3921 // Save and restore errno to avoid confusing native code with EINTR
3922 // after sigsuspend.
3923 int old_errno = errno;
3925 OSThread* osthread = thread->osthread();
3926 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3928 os::SuspendResume::State current = osthread->sr.state();
3929 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3930 suspend_save_context(osthread, uc);
3932 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3933 os::SuspendResume::State state = osthread->sr.suspended();
3934 if (state == os::SuspendResume::SR_SUSPENDED) {
3935 sigset_t suspend_set; // signals for sigsuspend()
3937 // get current set of blocked signals and unblock resume signal
3938 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3939 sigdelset(&suspend_set, os::Solaris::SIGasync());
3941 sr_semaphore.signal();
3942 // wait here until we are resumed
3943 while (1) {
3944 sigsuspend(&suspend_set);
3946 os::SuspendResume::State result = osthread->sr.running();
3947 if (result == os::SuspendResume::SR_RUNNING) {
3948 sr_semaphore.signal();
3949 break;
3950 }
3951 }
3953 } else if (state == os::SuspendResume::SR_RUNNING) {
3954 // request was cancelled, continue
3955 } else {
3956 ShouldNotReachHere();
3957 }
3959 resume_clear_context(osthread);
3960 } else if (current == os::SuspendResume::SR_RUNNING) {
3961 // request was cancelled, continue
3962 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3963 // ignore
3964 } else {
3965 // ignore
3966 }
3968 errno = old_errno;
3969 }
3972 void os::interrupt(Thread* thread) {
3973 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3975 OSThread* osthread = thread->osthread();
3977 int isInterrupted = osthread->interrupted();
3978 if (!isInterrupted) {
3979 osthread->set_interrupted(true);
3980 OrderAccess::fence();
3981 // os::sleep() is implemented with either poll (NULL,0,timeout) or
3982 // by parking on _SleepEvent. If the former, thr_kill will unwedge
3983 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
3984 ParkEvent * const slp = thread->_SleepEvent ;
3985 if (slp != NULL) slp->unpark() ;
3986 }
3988 // For JSR166: unpark after setting status but before thr_kill -dl
3989 if (thread->is_Java_thread()) {
3990 ((JavaThread*)thread)->parker()->unpark();
3991 }
3993 // Handle interruptible wait() ...
3994 ParkEvent * const ev = thread->_ParkEvent ;
3995 if (ev != NULL) ev->unpark() ;
3997 // When events are used everywhere for os::sleep, then this thr_kill
3998 // will only be needed if UseVMInterruptibleIO is true.
4000 if (!isInterrupted) {
4001 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
4002 assert_status(status == 0, status, "thr_kill");
4004 // Bump thread interruption counter
4005 RuntimeService::record_thread_interrupt_signaled_count();
4006 }
4007 }
4010 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
4011 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
4013 OSThread* osthread = thread->osthread();
4015 bool res = osthread->interrupted();
4017 // NOTE that since there is no "lock" around these two operations,
4018 // there is the possibility that the interrupted flag will be
4019 // "false" but that the interrupt event will be set. This is
4020 // intentional. The effect of this is that Object.wait() will appear
4021 // to have a spurious wakeup, which is not harmful, and the
4022 // possibility is so rare that it is not worth the added complexity
4023 // to add yet another lock. It has also been recommended not to put
4024 // the interrupted flag into the os::Solaris::Event structure,
4025 // because it hides the issue.
4026 if (res && clear_interrupted) {
4027 osthread->set_interrupted(false);
4028 }
4029 return res;
4030 }
4033 void os::print_statistics() {
4034 }
4036 int os::message_box(const char* title, const char* message) {
4037 int i;
4038 fdStream err(defaultStream::error_fd());
4039 for (i = 0; i < 78; i++) err.print_raw("=");
4040 err.cr();
4041 err.print_raw_cr(title);
4042 for (i = 0; i < 78; i++) err.print_raw("-");
4043 err.cr();
4044 err.print_raw_cr(message);
4045 for (i = 0; i < 78; i++) err.print_raw("=");
4046 err.cr();
4048 char buf[16];
4049 // Prevent process from exiting upon "read error" without consuming all CPU
4050 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4052 return buf[0] == 'y' || buf[0] == 'Y';
4053 }
4055 static int sr_notify(OSThread* osthread) {
4056 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4057 assert_status(status == 0, status, "thr_kill");
4058 return status;
4059 }
4061 // "Randomly" selected value for how long we want to spin
4062 // before bailing out on suspending a thread, also how often
4063 // we send a signal to a thread we want to resume
4064 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4065 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4067 static bool do_suspend(OSThread* osthread) {
4068 assert(osthread->sr.is_running(), "thread should be running");
4069 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4071 // mark as suspended and send signal
4072 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4073 // failed to switch, state wasn't running?
4074 ShouldNotReachHere();
4075 return false;
4076 }
4078 if (sr_notify(osthread) != 0) {
4079 ShouldNotReachHere();
4080 }
4082 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4083 while (true) {
4084 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4085 break;
4086 } else {
4087 // timeout
4088 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4089 if (cancelled == os::SuspendResume::SR_RUNNING) {
4090 return false;
4091 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4092 // make sure that we consume the signal on the semaphore as well
4093 sr_semaphore.wait();
4094 break;
4095 } else {
4096 ShouldNotReachHere();
4097 return false;
4098 }
4099 }
4100 }
4102 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4103 return true;
4104 }
4106 static void do_resume(OSThread* osthread) {
4107 assert(osthread->sr.is_suspended(), "thread should be suspended");
4108 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4110 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4111 // failed to switch to WAKEUP_REQUEST
4112 ShouldNotReachHere();
4113 return;
4114 }
4116 while (true) {
4117 if (sr_notify(osthread) == 0) {
4118 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4119 if (osthread->sr.is_running()) {
4120 return;
4121 }
4122 }
4123 } else {
4124 ShouldNotReachHere();
4125 }
4126 }
4128 guarantee(osthread->sr.is_running(), "Must be running!");
4129 }
4131 void os::SuspendedThreadTask::internal_do_task() {
4132 if (do_suspend(_thread->osthread())) {
4133 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4134 do_task(context);
4135 do_resume(_thread->osthread());
4136 }
4137 }
4139 class PcFetcher : public os::SuspendedThreadTask {
4140 public:
4141 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4142 ExtendedPC result();
4143 protected:
4144 void do_task(const os::SuspendedThreadTaskContext& context);
4145 private:
4146 ExtendedPC _epc;
4147 };
4149 ExtendedPC PcFetcher::result() {
4150 guarantee(is_done(), "task is not done yet.");
4151 return _epc;
4152 }
4154 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4155 Thread* thread = context.thread();
4156 OSThread* osthread = thread->osthread();
4157 if (osthread->ucontext() != NULL) {
4158 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4159 } else {
4160 // NULL context is unexpected, double-check this is the VMThread
4161 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4162 }
4163 }
4165 // A lightweight implementation that does not suspend the target thread and
4166 // thus returns only a hint. Used for profiling only!
4167 ExtendedPC os::get_thread_pc(Thread* thread) {
4168 // Make sure that it is called by the watcher and the Threads lock is owned.
4169 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4170 // For now, is only used to profile the VM Thread
4171 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4172 PcFetcher fetcher(thread);
4173 fetcher.run();
4174 return fetcher.result();
4175 }
4178 // This does not do anything on Solaris. This is basically a hook for being
4179 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4180 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4181 f(value, method, args, thread);
4182 }
4184 // This routine may be used by user applications as a "hook" to catch signals.
4185 // The user-defined signal handler must pass unrecognized signals to this
4186 // routine, and if it returns true (non-zero), then the signal handler must
4187 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4188 // routine will never retun false (zero), but instead will execute a VM panic
4189 // routine kill the process.
4190 //
4191 // If this routine returns false, it is OK to call it again. This allows
4192 // the user-defined signal handler to perform checks either before or after
4193 // the VM performs its own checks. Naturally, the user code would be making
4194 // a serious error if it tried to handle an exception (such as a null check
4195 // or breakpoint) that the VM was generating for its own correct operation.
4196 //
4197 // This routine may recognize any of the following kinds of signals:
4198 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4199 // os::Solaris::SIGasync
4200 // It should be consulted by handlers for any of those signals.
4201 // It explicitly does not recognize os::Solaris::SIGinterrupt
4202 //
4203 // The caller of this routine must pass in the three arguments supplied
4204 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4205 // field of the structure passed to sigaction(). This routine assumes that
4206 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4207 //
4208 // Note that the VM will print warnings if it detects conflicting signal
4209 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4210 //
4211 extern "C" JNIEXPORT int
4212 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4213 int abort_if_unrecognized);
4216 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4217 int orig_errno = errno; // Preserve errno value over signal handler.
4218 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4219 errno = orig_errno;
4220 }
4222 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4223 is needed to provoke threads blocked on IO to return an EINTR
4224 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4225 does NOT participate in signal chaining due to requirement for
4226 NOT setting SA_RESTART to make EINTR work. */
4227 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4228 if (UseSignalChaining) {
4229 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4230 if (actp && actp->sa_handler) {
4231 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4232 }
4233 }
4234 }
4236 // This boolean allows users to forward their own non-matching signals
4237 // to JVM_handle_solaris_signal, harmlessly.
4238 bool os::Solaris::signal_handlers_are_installed = false;
4240 // For signal-chaining
4241 bool os::Solaris::libjsig_is_loaded = false;
4242 typedef struct sigaction *(*get_signal_t)(int);
4243 get_signal_t os::Solaris::get_signal_action = NULL;
4245 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4246 struct sigaction *actp = NULL;
4248 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4249 // Retrieve the old signal handler from libjsig
4250 actp = (*get_signal_action)(sig);
4251 }
4252 if (actp == NULL) {
4253 // Retrieve the preinstalled signal handler from jvm
4254 actp = get_preinstalled_handler(sig);
4255 }
4257 return actp;
4258 }
4260 static bool call_chained_handler(struct sigaction *actp, int sig,
4261 siginfo_t *siginfo, void *context) {
4262 // Call the old signal handler
4263 if (actp->sa_handler == SIG_DFL) {
4264 // It's more reasonable to let jvm treat it as an unexpected exception
4265 // instead of taking the default action.
4266 return false;
4267 } else if (actp->sa_handler != SIG_IGN) {
4268 if ((actp->sa_flags & SA_NODEFER) == 0) {
4269 // automaticlly block the signal
4270 sigaddset(&(actp->sa_mask), sig);
4271 }
4273 sa_handler_t hand;
4274 sa_sigaction_t sa;
4275 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4276 // retrieve the chained handler
4277 if (siginfo_flag_set) {
4278 sa = actp->sa_sigaction;
4279 } else {
4280 hand = actp->sa_handler;
4281 }
4283 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4284 actp->sa_handler = SIG_DFL;
4285 }
4287 // try to honor the signal mask
4288 sigset_t oset;
4289 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4291 // call into the chained handler
4292 if (siginfo_flag_set) {
4293 (*sa)(sig, siginfo, context);
4294 } else {
4295 (*hand)(sig);
4296 }
4298 // restore the signal mask
4299 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4300 }
4301 // Tell jvm's signal handler the signal is taken care of.
4302 return true;
4303 }
4305 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4306 bool chained = false;
4307 // signal-chaining
4308 if (UseSignalChaining) {
4309 struct sigaction *actp = get_chained_signal_action(sig);
4310 if (actp != NULL) {
4311 chained = call_chained_handler(actp, sig, siginfo, context);
4312 }
4313 }
4314 return chained;
4315 }
4317 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4318 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4319 if (preinstalled_sigs[sig] != 0) {
4320 return &chainedsigactions[sig];
4321 }
4322 return NULL;
4323 }
4325 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4327 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4328 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4329 chainedsigactions[sig] = oldAct;
4330 preinstalled_sigs[sig] = 1;
4331 }
4333 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4334 // Check for overwrite.
4335 struct sigaction oldAct;
4336 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4337 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4338 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4339 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4340 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4341 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4342 if (AllowUserSignalHandlers || !set_installed) {
4343 // Do not overwrite; user takes responsibility to forward to us.
4344 return;
4345 } else if (UseSignalChaining) {
4346 if (oktochain) {
4347 // save the old handler in jvm
4348 save_preinstalled_handler(sig, oldAct);
4349 } else {
4350 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4351 }
4352 // libjsig also interposes the sigaction() call below and saves the
4353 // old sigaction on it own.
4354 } else {
4355 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4356 "%#lx for signal %d.", (long)oldhand, sig));
4357 }
4358 }
4360 struct sigaction sigAct;
4361 sigfillset(&(sigAct.sa_mask));
4362 sigAct.sa_handler = SIG_DFL;
4364 sigAct.sa_sigaction = signalHandler;
4365 // Handle SIGSEGV on alternate signal stack if
4366 // not using stack banging
4367 if (!UseStackBanging && sig == SIGSEGV) {
4368 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4369 // Interruptible i/o requires SA_RESTART cleared so EINTR
4370 // is returned instead of restarting system calls
4371 } else if (sig == os::Solaris::SIGinterrupt()) {
4372 sigemptyset(&sigAct.sa_mask);
4373 sigAct.sa_handler = NULL;
4374 sigAct.sa_flags = SA_SIGINFO;
4375 sigAct.sa_sigaction = sigINTRHandler;
4376 } else {
4377 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4378 }
4379 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4381 sigaction(sig, &sigAct, &oldAct);
4383 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4384 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4385 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4386 }
4389 #define DO_SIGNAL_CHECK(sig) \
4390 if (!sigismember(&check_signal_done, sig)) \
4391 os::Solaris::check_signal_handler(sig)
4393 // This method is a periodic task to check for misbehaving JNI applications
4394 // under CheckJNI, we can add any periodic checks here
4396 void os::run_periodic_checks() {
4397 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4398 // thereby preventing a NULL checks.
4399 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4401 if (check_signals == false) return;
4403 // SEGV and BUS if overridden could potentially prevent
4404 // generation of hs*.log in the event of a crash, debugging
4405 // such a case can be very challenging, so we absolutely
4406 // check for the following for a good measure:
4407 DO_SIGNAL_CHECK(SIGSEGV);
4408 DO_SIGNAL_CHECK(SIGILL);
4409 DO_SIGNAL_CHECK(SIGFPE);
4410 DO_SIGNAL_CHECK(SIGBUS);
4411 DO_SIGNAL_CHECK(SIGPIPE);
4412 DO_SIGNAL_CHECK(SIGXFSZ);
4414 // ReduceSignalUsage allows the user to override these handlers
4415 // see comments at the very top and jvm_solaris.h
4416 if (!ReduceSignalUsage) {
4417 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4418 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4419 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4420 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4421 }
4423 // See comments above for using JVM1/JVM2 and UseAltSigs
4424 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4425 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4427 }
4429 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4431 static os_sigaction_t os_sigaction = NULL;
4433 void os::Solaris::check_signal_handler(int sig) {
4434 char buf[O_BUFLEN];
4435 address jvmHandler = NULL;
4437 struct sigaction act;
4438 if (os_sigaction == NULL) {
4439 // only trust the default sigaction, in case it has been interposed
4440 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4441 if (os_sigaction == NULL) return;
4442 }
4444 os_sigaction(sig, (struct sigaction*)NULL, &act);
4446 address thisHandler = (act.sa_flags & SA_SIGINFO)
4447 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4448 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4451 switch(sig) {
4452 case SIGSEGV:
4453 case SIGBUS:
4454 case SIGFPE:
4455 case SIGPIPE:
4456 case SIGXFSZ:
4457 case SIGILL:
4458 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4459 break;
4461 case SHUTDOWN1_SIGNAL:
4462 case SHUTDOWN2_SIGNAL:
4463 case SHUTDOWN3_SIGNAL:
4464 case BREAK_SIGNAL:
4465 jvmHandler = (address)user_handler();
4466 break;
4468 default:
4469 int intrsig = os::Solaris::SIGinterrupt();
4470 int asynsig = os::Solaris::SIGasync();
4472 if (sig == intrsig) {
4473 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4474 } else if (sig == asynsig) {
4475 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4476 } else {
4477 return;
4478 }
4479 break;
4480 }
4483 if (thisHandler != jvmHandler) {
4484 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4485 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4486 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4487 // No need to check this sig any longer
4488 sigaddset(&check_signal_done, sig);
4489 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4490 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4491 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4492 exception_name(sig, buf, O_BUFLEN));
4493 }
4494 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4495 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4496 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4497 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4498 // No need to check this sig any longer
4499 sigaddset(&check_signal_done, sig);
4500 }
4502 // Print all the signal handler state
4503 if (sigismember(&check_signal_done, sig)) {
4504 print_signal_handlers(tty, buf, O_BUFLEN);
4505 }
4507 }
4509 void os::Solaris::install_signal_handlers() {
4510 bool libjsigdone = false;
4511 signal_handlers_are_installed = true;
4513 // signal-chaining
4514 typedef void (*signal_setting_t)();
4515 signal_setting_t begin_signal_setting = NULL;
4516 signal_setting_t end_signal_setting = NULL;
4517 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4518 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4519 if (begin_signal_setting != NULL) {
4520 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4521 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4522 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4523 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4524 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4525 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4526 libjsig_is_loaded = true;
4527 if (os::Solaris::get_libjsig_version != NULL) {
4528 libjsigversion = (*os::Solaris::get_libjsig_version)();
4529 }
4530 assert(UseSignalChaining, "should enable signal-chaining");
4531 }
4532 if (libjsig_is_loaded) {
4533 // Tell libjsig jvm is setting signal handlers
4534 (*begin_signal_setting)();
4535 }
4537 set_signal_handler(SIGSEGV, true, true);
4538 set_signal_handler(SIGPIPE, true, true);
4539 set_signal_handler(SIGXFSZ, true, true);
4540 set_signal_handler(SIGBUS, true, true);
4541 set_signal_handler(SIGILL, true, true);
4542 set_signal_handler(SIGFPE, true, true);
4545 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4547 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4548 // can not register overridable signals which might be > 32
4549 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4550 // Tell libjsig jvm has finished setting signal handlers
4551 (*end_signal_setting)();
4552 libjsigdone = true;
4553 }
4554 }
4556 // Never ok to chain our SIGinterrupt
4557 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4558 set_signal_handler(os::Solaris::SIGasync(), true, true);
4560 if (libjsig_is_loaded && !libjsigdone) {
4561 // Tell libjsig jvm finishes setting signal handlers
4562 (*end_signal_setting)();
4563 }
4565 // We don't activate signal checker if libjsig is in place, we trust ourselves
4566 // and if UserSignalHandler is installed all bets are off.
4567 // Log that signal checking is off only if -verbose:jni is specified.
4568 if (CheckJNICalls) {
4569 if (libjsig_is_loaded) {
4570 if (PrintJNIResolving) {
4571 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4572 }
4573 check_signals = false;
4574 }
4575 if (AllowUserSignalHandlers) {
4576 if (PrintJNIResolving) {
4577 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4578 }
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, mtInternal);
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, mtInternal); // retry.
4708 }
4710 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
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 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4869 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4870 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4872 void init_pset_getloadavg_ptr(void) {
4873 pset_getloadavg_ptr =
4874 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4875 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4876 warning("pset_getloadavg function not found");
4877 }
4878 }
4880 int os::Solaris::_dev_zero_fd = -1;
4882 // this is called _before_ the global arguments have been parsed
4883 void os::init(void) {
4884 _initial_pid = getpid();
4886 max_hrtime = first_hrtime = gethrtime();
4888 init_random(1234567);
4890 page_size = sysconf(_SC_PAGESIZE);
4891 if (page_size == -1)
4892 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4893 strerror(errno)));
4894 init_page_sizes((size_t) page_size);
4896 Solaris::initialize_system_info();
4898 // Initialize misc. symbols as soon as possible, so we can use them
4899 // if we need them.
4900 Solaris::misc_sym_init();
4902 int fd = ::open("/dev/zero", O_RDWR);
4903 if (fd < 0) {
4904 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4905 } else {
4906 Solaris::set_dev_zero_fd(fd);
4908 // Close on exec, child won't inherit.
4909 fcntl(fd, F_SETFD, FD_CLOEXEC);
4910 }
4912 clock_tics_per_sec = CLK_TCK;
4914 // check if dladdr1() exists; dladdr1 can provide more information than
4915 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4916 // and is available on linker patches for 5.7 and 5.8.
4917 // libdl.so must have been loaded, this call is just an entry lookup
4918 void * hdl = dlopen("libdl.so", RTLD_NOW);
4919 if (hdl)
4920 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4922 // (Solaris only) this switches to calls that actually do locking.
4923 ThreadCritical::initialize();
4925 // main_thread points to the thread that created/loaded the JVM.
4926 main_thread = thr_self();
4928 // Constant minimum stack size allowed. It must be at least
4929 // the minimum of what the OS supports (thr_min_stack()), and
4930 // enough to allow the thread to get to user bytecode execution.
4931 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4933 // retrieve entry point for pthread_setname_np
4934 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4935 if (handle != NULL) {
4936 Solaris::_pthread_setname_np =
4937 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4938 }
4939 // If the pagesize of the VM is greater than 8K determine the appropriate
4940 // number of initial guard pages. The user can change this with the
4941 // command line arguments, if needed.
4942 if (vm_page_size() > 8*K) {
4943 StackYellowPages = 1;
4944 StackRedPages = 1;
4945 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4946 }
4947 }
4949 // To install functions for atexit system call
4950 extern "C" {
4951 static void perfMemory_exit_helper() {
4952 perfMemory_exit();
4953 }
4954 }
4956 // this is called _after_ the global arguments have been parsed
4957 jint os::init_2(void) {
4958 // try to enable extended file IO ASAP, see 6431278
4959 os::Solaris::try_enable_extended_io();
4961 // Allocate a single page and mark it as readable for safepoint polling. Also
4962 // use this first mmap call to check support for MAP_ALIGN.
4963 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4964 page_size,
4965 MAP_PRIVATE | MAP_ALIGN,
4966 PROT_READ);
4967 if (polling_page == NULL) {
4968 has_map_align = false;
4969 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4970 PROT_READ);
4971 }
4973 os::set_polling_page(polling_page);
4975 #ifndef PRODUCT
4976 if( Verbose && PrintMiscellaneous )
4977 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4978 #endif
4980 if (!UseMembar) {
4981 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4982 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4983 os::set_memory_serialize_page( mem_serialize_page );
4985 #ifndef PRODUCT
4986 if(Verbose && PrintMiscellaneous)
4987 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4988 #endif
4989 }
4991 // Check minimum allowable stack size for thread creation and to initialize
4992 // the java system classes, including StackOverflowError - depends on page
4993 // size. Add a page for compiler2 recursion in main thread.
4994 // Add in 2*BytesPerWord times page size to account for VM stack during
4995 // class initialization depending on 32 or 64 bit VM.
4996 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4997 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4998 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
5000 size_t threadStackSizeInBytes = ThreadStackSize * K;
5001 if (threadStackSizeInBytes != 0 &&
5002 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
5003 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
5004 os::Solaris::min_stack_allowed/K);
5005 return JNI_ERR;
5006 }
5008 // For 64kbps there will be a 64kb page size, which makes
5009 // the usable default stack size quite a bit less. Increase the
5010 // stack for 64kb (or any > than 8kb) pages, this increases
5011 // virtual memory fragmentation (since we're not creating the
5012 // stack on a power of 2 boundary. The real fix for this
5013 // should be to fix the guard page mechanism.
5015 if (vm_page_size() > 8*K) {
5016 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
5017 ? threadStackSizeInBytes +
5018 ((StackYellowPages + StackRedPages) * vm_page_size())
5019 : 0;
5020 ThreadStackSize = threadStackSizeInBytes/K;
5021 }
5023 // Make the stack size a multiple of the page size so that
5024 // the yellow/red zones can be guarded.
5025 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5026 vm_page_size()));
5028 Solaris::libthread_init();
5030 if (UseNUMA) {
5031 if (!Solaris::liblgrp_init()) {
5032 UseNUMA = false;
5033 } else {
5034 size_t lgrp_limit = os::numa_get_groups_num();
5035 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5036 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5037 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5038 if (lgrp_num < 2) {
5039 // There's only one locality group, disable NUMA.
5040 UseNUMA = false;
5041 }
5042 }
5043 if (!UseNUMA && ForceNUMA) {
5044 UseNUMA = true;
5045 }
5046 }
5048 Solaris::signal_sets_init();
5049 Solaris::init_signal_mem();
5050 Solaris::install_signal_handlers();
5052 if (libjsigversion < JSIG_VERSION_1_4_1) {
5053 Maxlibjsigsigs = OLDMAXSIGNUM;
5054 }
5056 // initialize synchronization primitives to use either thread or
5057 // lwp synchronization (controlled by UseLWPSynchronization)
5058 Solaris::synchronization_init();
5060 if (MaxFDLimit) {
5061 // set the number of file descriptors to max. print out error
5062 // if getrlimit/setrlimit fails but continue regardless.
5063 struct rlimit nbr_files;
5064 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5065 if (status != 0) {
5066 if (PrintMiscellaneous && (Verbose || WizardMode))
5067 perror("os::init_2 getrlimit failed");
5068 } else {
5069 nbr_files.rlim_cur = nbr_files.rlim_max;
5070 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5071 if (status != 0) {
5072 if (PrintMiscellaneous && (Verbose || WizardMode))
5073 perror("os::init_2 setrlimit failed");
5074 }
5075 }
5076 }
5078 // Calculate theoretical max. size of Threads to guard gainst
5079 // artifical out-of-memory situations, where all available address-
5080 // space has been reserved by thread stacks. Default stack size is 1Mb.
5081 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5082 JavaThread::stack_size_at_create() : (1*K*K);
5083 assert(pre_thread_stack_size != 0, "Must have a stack");
5084 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5085 // we should start doing Virtual Memory banging. Currently when the threads will
5086 // have used all but 200Mb of space.
5087 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5088 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5090 // at-exit methods are called in the reverse order of their registration.
5091 // In Solaris 7 and earlier, atexit functions are called on return from
5092 // main or as a result of a call to exit(3C). There can be only 32 of
5093 // these functions registered and atexit() does not set errno. In Solaris
5094 // 8 and later, there is no limit to the number of functions registered
5095 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5096 // functions are called upon dlclose(3DL) in addition to return from main
5097 // and exit(3C).
5099 if (PerfAllowAtExitRegistration) {
5100 // only register atexit functions if PerfAllowAtExitRegistration is set.
5101 // atexit functions can be delayed until process exit time, which
5102 // can be problematic for embedded VM situations. Embedded VMs should
5103 // call DestroyJavaVM() to assure that VM resources are released.
5105 // note: perfMemory_exit_helper atexit function may be removed in
5106 // the future if the appropriate cleanup code can be added to the
5107 // VM_Exit VMOperation's doit method.
5108 if (atexit(perfMemory_exit_helper) != 0) {
5109 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5110 }
5111 }
5113 // Init pset_loadavg function pointer
5114 init_pset_getloadavg_ptr();
5116 return JNI_OK;
5117 }
5119 // Mark the polling page as unreadable
5120 void os::make_polling_page_unreadable(void) {
5121 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5122 fatal("Could not disable polling page");
5123 };
5125 // Mark the polling page as readable
5126 void os::make_polling_page_readable(void) {
5127 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5128 fatal("Could not enable polling page");
5129 };
5131 // OS interface.
5133 bool os::check_heap(bool force) { return true; }
5135 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5136 static vsnprintf_t sol_vsnprintf = NULL;
5138 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5139 if (!sol_vsnprintf) {
5140 //search for the named symbol in the objects that were loaded after libjvm
5141 void* where = RTLD_NEXT;
5142 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5143 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5144 if (!sol_vsnprintf){
5145 //search for the named symbol in the objects that were loaded before libjvm
5146 where = RTLD_DEFAULT;
5147 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5148 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5149 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5150 }
5151 }
5152 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5153 }
5156 // Is a (classpath) directory empty?
5157 bool os::dir_is_empty(const char* path) {
5158 DIR *dir = NULL;
5159 struct dirent *ptr;
5161 dir = opendir(path);
5162 if (dir == NULL) return true;
5164 /* Scan the directory */
5165 bool result = true;
5166 char buf[sizeof(struct dirent) + MAX_PATH];
5167 struct dirent *dbuf = (struct dirent *) buf;
5168 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5169 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5170 result = false;
5171 }
5172 }
5173 closedir(dir);
5174 return result;
5175 }
5177 // This code originates from JDK's sysOpen and open64_w
5178 // from src/solaris/hpi/src/system_md.c
5180 #ifndef O_DELETE
5181 #define O_DELETE 0x10000
5182 #endif
5184 // Open a file. Unlink the file immediately after open returns
5185 // if the specified oflag has the O_DELETE flag set.
5186 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5188 int os::open(const char *path, int oflag, int mode) {
5189 if (strlen(path) > MAX_PATH - 1) {
5190 errno = ENAMETOOLONG;
5191 return -1;
5192 }
5193 int fd;
5194 int o_delete = (oflag & O_DELETE);
5195 oflag = oflag & ~O_DELETE;
5197 fd = ::open64(path, oflag, mode);
5198 if (fd == -1) return -1;
5200 //If the open succeeded, the file might still be a directory
5201 {
5202 struct stat64 buf64;
5203 int ret = ::fstat64(fd, &buf64);
5204 int st_mode = buf64.st_mode;
5206 if (ret != -1) {
5207 if ((st_mode & S_IFMT) == S_IFDIR) {
5208 errno = EISDIR;
5209 ::close(fd);
5210 return -1;
5211 }
5212 } else {
5213 ::close(fd);
5214 return -1;
5215 }
5216 }
5217 /*
5218 * 32-bit Solaris systems suffer from:
5219 *
5220 * - an historical default soft limit of 256 per-process file
5221 * descriptors that is too low for many Java programs.
5222 *
5223 * - a design flaw where file descriptors created using stdio
5224 * fopen must be less than 256, _even_ when the first limit above
5225 * has been raised. This can cause calls to fopen (but not calls to
5226 * open, for example) to fail mysteriously, perhaps in 3rd party
5227 * native code (although the JDK itself uses fopen). One can hardly
5228 * criticize them for using this most standard of all functions.
5229 *
5230 * We attempt to make everything work anyways by:
5231 *
5232 * - raising the soft limit on per-process file descriptors beyond
5233 * 256
5234 *
5235 * - As of Solaris 10u4, we can request that Solaris raise the 256
5236 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5237 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5238 *
5239 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5240 * workaround the bug by remapping non-stdio file descriptors below
5241 * 256 to ones beyond 256, which is done below.
5242 *
5243 * See:
5244 * 1085341: 32-bit stdio routines should support file descriptors >255
5245 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5246 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5247 * enable_extended_FILE_stdio() in VM initialisation
5248 * Giri Mandalika's blog
5249 * http://technopark02.blogspot.com/2005_05_01_archive.html
5250 */
5251 #ifndef _LP64
5252 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5253 int newfd = ::fcntl(fd, F_DUPFD, 256);
5254 if (newfd != -1) {
5255 ::close(fd);
5256 fd = newfd;
5257 }
5258 }
5259 #endif // 32-bit Solaris
5260 /*
5261 * All file descriptors that are opened in the JVM and not
5262 * specifically destined for a subprocess should have the
5263 * close-on-exec flag set. If we don't set it, then careless 3rd
5264 * party native code might fork and exec without closing all
5265 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5266 * UNIXProcess.c), and this in turn might:
5267 *
5268 * - cause end-of-file to fail to be detected on some file
5269 * descriptors, resulting in mysterious hangs, or
5270 *
5271 * - might cause an fopen in the subprocess to fail on a system
5272 * suffering from bug 1085341.
5273 *
5274 * (Yes, the default setting of the close-on-exec flag is a Unix
5275 * design flaw)
5276 *
5277 * See:
5278 * 1085341: 32-bit stdio routines should support file descriptors >255
5279 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5280 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5281 */
5282 #ifdef FD_CLOEXEC
5283 {
5284 int flags = ::fcntl(fd, F_GETFD);
5285 if (flags != -1)
5286 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5287 }
5288 #endif
5290 if (o_delete != 0) {
5291 ::unlink(path);
5292 }
5293 return fd;
5294 }
5296 // create binary file, rewriting existing file if required
5297 int os::create_binary_file(const char* path, bool rewrite_existing) {
5298 int oflags = O_WRONLY | O_CREAT;
5299 if (!rewrite_existing) {
5300 oflags |= O_EXCL;
5301 }
5302 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5303 }
5305 // return current position of file pointer
5306 jlong os::current_file_offset(int fd) {
5307 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5308 }
5310 // move file pointer to the specified offset
5311 jlong os::seek_to_file_offset(int fd, jlong offset) {
5312 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5313 }
5315 jlong os::lseek(int fd, jlong offset, int whence) {
5316 return (jlong) ::lseek64(fd, offset, whence);
5317 }
5319 char * os::native_path(char *path) {
5320 return path;
5321 }
5323 int os::ftruncate(int fd, jlong length) {
5324 return ::ftruncate64(fd, length);
5325 }
5327 int os::fsync(int fd) {
5328 RESTARTABLE_RETURN_INT(::fsync(fd));
5329 }
5331 int os::available(int fd, jlong *bytes) {
5332 jlong cur, end;
5333 int mode;
5334 struct stat64 buf64;
5336 if (::fstat64(fd, &buf64) >= 0) {
5337 mode = buf64.st_mode;
5338 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5339 /*
5340 * XXX: is the following call interruptible? If so, this might
5341 * need to go through the INTERRUPT_IO() wrapper as for other
5342 * blocking, interruptible calls in this file.
5343 */
5344 int n,ioctl_return;
5346 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5347 if (ioctl_return>= 0) {
5348 *bytes = n;
5349 return 1;
5350 }
5351 }
5352 }
5353 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5354 return 0;
5355 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5356 return 0;
5357 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5358 return 0;
5359 }
5360 *bytes = end - cur;
5361 return 1;
5362 }
5364 // Map a block of memory.
5365 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5366 char *addr, size_t bytes, bool read_only,
5367 bool allow_exec) {
5368 int prot;
5369 int flags;
5371 if (read_only) {
5372 prot = PROT_READ;
5373 flags = MAP_SHARED;
5374 } else {
5375 prot = PROT_READ | PROT_WRITE;
5376 flags = MAP_PRIVATE;
5377 }
5379 if (allow_exec) {
5380 prot |= PROT_EXEC;
5381 }
5383 if (addr != NULL) {
5384 flags |= MAP_FIXED;
5385 }
5387 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5388 fd, file_offset);
5389 if (mapped_address == MAP_FAILED) {
5390 return NULL;
5391 }
5392 return mapped_address;
5393 }
5396 // Remap a block of memory.
5397 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5398 char *addr, size_t bytes, bool read_only,
5399 bool allow_exec) {
5400 // same as map_memory() on this OS
5401 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5402 allow_exec);
5403 }
5406 // Unmap a block of memory.
5407 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5408 return munmap(addr, bytes) == 0;
5409 }
5411 void os::pause() {
5412 char filename[MAX_PATH];
5413 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5414 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5415 } else {
5416 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5417 }
5419 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5420 if (fd != -1) {
5421 struct stat buf;
5422 ::close(fd);
5423 while (::stat(filename, &buf) == 0) {
5424 (void)::poll(NULL, 0, 100);
5425 }
5426 } else {
5427 jio_fprintf(stderr,
5428 "Could not open pause file '%s', continuing immediately.\n", filename);
5429 }
5430 }
5432 #ifndef PRODUCT
5433 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5434 // Turn this on if you need to trace synch operations.
5435 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5436 // and call record_synch_enable and record_synch_disable
5437 // around the computation of interest.
5439 void record_synch(char* name, bool returning); // defined below
5441 class RecordSynch {
5442 char* _name;
5443 public:
5444 RecordSynch(char* name) :_name(name)
5445 { record_synch(_name, false); }
5446 ~RecordSynch() { record_synch(_name, true); }
5447 };
5449 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5450 extern "C" ret name params { \
5451 typedef ret name##_t params; \
5452 static name##_t* implem = NULL; \
5453 static int callcount = 0; \
5454 if (implem == NULL) { \
5455 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5456 if (implem == NULL) fatal(dlerror()); \
5457 } \
5458 ++callcount; \
5459 RecordSynch _rs(#name); \
5460 inner; \
5461 return implem args; \
5462 }
5463 // in dbx, examine callcounts this way:
5464 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5466 #define CHECK_POINTER_OK(p) \
5467 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5468 #define CHECK_MU \
5469 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5470 #define CHECK_CV \
5471 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5472 #define CHECK_P(p) \
5473 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5475 #define CHECK_MUTEX(mutex_op) \
5476 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5478 CHECK_MUTEX( mutex_lock)
5479 CHECK_MUTEX( _mutex_lock)
5480 CHECK_MUTEX( mutex_unlock)
5481 CHECK_MUTEX(_mutex_unlock)
5482 CHECK_MUTEX( mutex_trylock)
5483 CHECK_MUTEX(_mutex_trylock)
5485 #define CHECK_COND(cond_op) \
5486 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5488 CHECK_COND( cond_wait);
5489 CHECK_COND(_cond_wait);
5490 CHECK_COND(_cond_wait_cancel);
5492 #define CHECK_COND2(cond_op) \
5493 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5495 CHECK_COND2( cond_timedwait);
5496 CHECK_COND2(_cond_timedwait);
5497 CHECK_COND2(_cond_timedwait_cancel);
5499 // do the _lwp_* versions too
5500 #define mutex_t lwp_mutex_t
5501 #define cond_t lwp_cond_t
5502 CHECK_MUTEX( _lwp_mutex_lock)
5503 CHECK_MUTEX( _lwp_mutex_unlock)
5504 CHECK_MUTEX( _lwp_mutex_trylock)
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)
5511 CHECK_COND( _lwp_cond_wait);
5512 CHECK_COND( __lwp_cond_wait);
5513 CHECK_COND(___lwp_cond_wait);
5515 CHECK_COND2( _lwp_cond_timedwait);
5516 CHECK_COND2( __lwp_cond_timedwait);
5517 #undef mutex_t
5518 #undef cond_t
5520 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5521 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5522 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5523 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5524 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5525 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5526 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5527 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5530 // recording machinery:
5532 enum { RECORD_SYNCH_LIMIT = 200 };
5533 char* record_synch_name[RECORD_SYNCH_LIMIT];
5534 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5535 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5536 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5537 int record_synch_count = 0;
5538 bool record_synch_enabled = false;
5540 // in dbx, examine recorded data this way:
5541 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5543 void record_synch(char* name, bool returning) {
5544 if (record_synch_enabled) {
5545 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5546 record_synch_name[record_synch_count] = name;
5547 record_synch_returning[record_synch_count] = returning;
5548 record_synch_thread[record_synch_count] = thr_self();
5549 record_synch_arg0ptr[record_synch_count] = &name;
5550 record_synch_count++;
5551 }
5552 // put more checking code here:
5553 // ...
5554 }
5555 }
5557 void record_synch_enable() {
5558 // start collecting trace data, if not already doing so
5559 if (!record_synch_enabled) record_synch_count = 0;
5560 record_synch_enabled = true;
5561 }
5563 void record_synch_disable() {
5564 // stop collecting trace data
5565 record_synch_enabled = false;
5566 }
5568 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5569 #endif // PRODUCT
5571 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5572 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5573 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5576 // JVMTI & JVM monitoring and management support
5577 // The thread_cpu_time() and current_thread_cpu_time() are only
5578 // supported if is_thread_cpu_time_supported() returns true.
5579 // They are not supported on Solaris T1.
5581 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5582 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5583 // of a thread.
5584 //
5585 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5586 // returns the fast estimate available on the platform.
5588 // hrtime_t gethrvtime() return value includes
5589 // user time but does not include system time
5590 jlong os::current_thread_cpu_time() {
5591 return (jlong) gethrvtime();
5592 }
5594 jlong os::thread_cpu_time(Thread *thread) {
5595 // return user level CPU time only to be consistent with
5596 // what current_thread_cpu_time returns.
5597 // thread_cpu_time_info() must be changed if this changes
5598 return os::thread_cpu_time(thread, false /* user time only */);
5599 }
5601 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5602 if (user_sys_cpu_time) {
5603 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5604 } else {
5605 return os::current_thread_cpu_time();
5606 }
5607 }
5609 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5610 char proc_name[64];
5611 int count;
5612 prusage_t prusage;
5613 jlong lwp_time;
5614 int fd;
5616 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5617 getpid(),
5618 thread->osthread()->lwp_id());
5619 fd = ::open(proc_name, O_RDONLY);
5620 if ( fd == -1 ) return -1;
5622 do {
5623 count = ::pread(fd,
5624 (void *)&prusage.pr_utime,
5625 thr_time_size,
5626 thr_time_off);
5627 } while (count < 0 && errno == EINTR);
5628 ::close(fd);
5629 if ( count < 0 ) return -1;
5631 if (user_sys_cpu_time) {
5632 // user + system CPU time
5633 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5634 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5635 (jlong)prusage.pr_stime.tv_nsec +
5636 (jlong)prusage.pr_utime.tv_nsec;
5637 } else {
5638 // user level CPU time only
5639 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5640 (jlong)prusage.pr_utime.tv_nsec;
5641 }
5643 return(lwp_time);
5644 }
5646 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5647 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5648 info_ptr->may_skip_backward = false; // elapsed time not wall time
5649 info_ptr->may_skip_forward = false; // elapsed time not wall time
5650 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5651 }
5653 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5654 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5655 info_ptr->may_skip_backward = false; // elapsed time not wall time
5656 info_ptr->may_skip_forward = false; // elapsed time not wall time
5657 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5658 }
5660 bool os::is_thread_cpu_time_supported() {
5661 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5662 return true;
5663 } else {
5664 return false;
5665 }
5666 }
5668 // System loadavg support. Returns -1 if load average cannot be obtained.
5669 // Return the load average for our processor set if the primitive exists
5670 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5671 int os::loadavg(double loadavg[], int nelem) {
5672 if (pset_getloadavg_ptr != NULL) {
5673 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5674 } else {
5675 return ::getloadavg(loadavg, nelem);
5676 }
5677 }
5679 //---------------------------------------------------------------------------------
5681 bool os::find(address addr, outputStream* st) {
5682 Dl_info dlinfo;
5683 memset(&dlinfo, 0, sizeof(dlinfo));
5684 if (dladdr(addr, &dlinfo) != 0) {
5685 st->print(PTR_FORMAT ": ", addr);
5686 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5687 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5688 } else if (dlinfo.dli_fbase != NULL)
5689 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5690 else
5691 st->print("<absolute address>");
5692 if (dlinfo.dli_fname != NULL) {
5693 st->print(" in %s", dlinfo.dli_fname);
5694 }
5695 if (dlinfo.dli_fbase != NULL) {
5696 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5697 }
5698 st->cr();
5700 if (Verbose) {
5701 // decode some bytes around the PC
5702 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5703 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5704 address lowest = (address) dlinfo.dli_sname;
5705 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5706 if (begin < lowest) begin = lowest;
5707 Dl_info dlinfo2;
5708 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5709 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5710 end = (address) dlinfo2.dli_saddr;
5711 Disassembler::decode(begin, end, st);
5712 }
5713 return true;
5714 }
5715 return false;
5716 }
5718 // Following function has been added to support HotSparc's libjvm.so running
5719 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5720 // src/solaris/hpi/native_threads in the EVM codebase.
5721 //
5722 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5723 // libraries and should thus be removed. We will leave it behind for a while
5724 // until we no longer want to able to run on top of 1.3.0 Solaris production
5725 // JDK. See 4341971.
5727 #define STACK_SLACK 0x800
5729 extern "C" {
5730 intptr_t sysThreadAvailableStackWithSlack() {
5731 stack_t st;
5732 intptr_t retval, stack_top;
5733 retval = thr_stksegment(&st);
5734 assert(retval == 0, "incorrect return value from thr_stksegment");
5735 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5736 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5737 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5738 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5739 }
5740 }
5742 // ObjectMonitor park-unpark infrastructure ...
5743 //
5744 // We implement Solaris and Linux PlatformEvents with the
5745 // obvious condvar-mutex-flag triple.
5746 // Another alternative that works quite well is pipes:
5747 // Each PlatformEvent consists of a pipe-pair.
5748 // The thread associated with the PlatformEvent
5749 // calls park(), which reads from the input end of the pipe.
5750 // Unpark() writes into the other end of the pipe.
5751 // The write-side of the pipe must be set NDELAY.
5752 // Unfortunately pipes consume a large # of handles.
5753 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5754 // Using pipes for the 1st few threads might be workable, however.
5755 //
5756 // park() is permitted to return spuriously.
5757 // Callers of park() should wrap the call to park() in
5758 // an appropriate loop. A litmus test for the correct
5759 // usage of park is the following: if park() were modified
5760 // to immediately return 0 your code should still work,
5761 // albeit degenerating to a spin loop.
5762 //
5763 // An interesting optimization for park() is to use a trylock()
5764 // to attempt to acquire the mutex. If the trylock() fails
5765 // then we know that a concurrent unpark() operation is in-progress.
5766 // in that case the park() code could simply set _count to 0
5767 // and return immediately. The subsequent park() operation *might*
5768 // return immediately. That's harmless as the caller of park() is
5769 // expected to loop. By using trylock() we will have avoided a
5770 // avoided a context switch caused by contention on the per-thread mutex.
5771 //
5772 // TODO-FIXME:
5773 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5774 // objectmonitor implementation.
5775 // 2. Collapse the JSR166 parker event, and the
5776 // objectmonitor ParkEvent into a single "Event" construct.
5777 // 3. In park() and unpark() add:
5778 // assert (Thread::current() == AssociatedWith).
5779 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5780 // 1-out-of-N park() operations will return immediately.
5781 //
5782 // _Event transitions in park()
5783 // -1 => -1 : illegal
5784 // 1 => 0 : pass - return immediately
5785 // 0 => -1 : block
5786 //
5787 // _Event serves as a restricted-range semaphore.
5788 //
5789 // Another possible encoding of _Event would be with
5790 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5791 //
5792 // TODO-FIXME: add DTRACE probes for:
5793 // 1. Tx parks
5794 // 2. Ty unparks Tx
5795 // 3. Tx resumes from park
5798 // value determined through experimentation
5799 #define ROUNDINGFIX 11
5801 // utility to compute the abstime argument to timedwait.
5802 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5804 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5805 // millis is the relative timeout time
5806 // abstime will be the absolute timeout time
5807 if (millis < 0) millis = 0;
5808 struct timeval now;
5809 int status = gettimeofday(&now, NULL);
5810 assert(status == 0, "gettimeofday");
5811 jlong seconds = millis / 1000;
5812 jlong max_wait_period;
5814 if (UseLWPSynchronization) {
5815 // forward port of fix for 4275818 (not sleeping long enough)
5816 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5817 // _lwp_cond_timedwait() used a round_down algorithm rather
5818 // than a round_up. For millis less than our roundfactor
5819 // it rounded down to 0 which doesn't meet the spec.
5820 // For millis > roundfactor we may return a bit sooner, but
5821 // since we can not accurately identify the patch level and
5822 // this has already been fixed in Solaris 9 and 8 we will
5823 // leave it alone rather than always rounding down.
5825 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5826 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5827 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5828 max_wait_period = 21000000;
5829 } else {
5830 max_wait_period = 50000000;
5831 }
5832 millis %= 1000;
5833 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5834 seconds = max_wait_period;
5835 }
5836 abstime->tv_sec = now.tv_sec + seconds;
5837 long usec = now.tv_usec + millis * 1000;
5838 if (usec >= 1000000) {
5839 abstime->tv_sec += 1;
5840 usec -= 1000000;
5841 }
5842 abstime->tv_nsec = usec * 1000;
5843 return abstime;
5844 }
5846 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5847 // Conceptually TryPark() should be equivalent to park(0).
5849 int os::PlatformEvent::TryPark() {
5850 for (;;) {
5851 const int v = _Event ;
5852 guarantee ((v == 0) || (v == 1), "invariant") ;
5853 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5854 }
5855 }
5857 void os::PlatformEvent::park() { // AKA: down()
5858 // Invariant: Only the thread associated with the Event/PlatformEvent
5859 // may call park().
5860 int v ;
5861 for (;;) {
5862 v = _Event ;
5863 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5864 }
5865 guarantee (v >= 0, "invariant") ;
5866 if (v == 0) {
5867 // Do this the hard way by blocking ...
5868 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5869 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5870 // Only for SPARC >= V8PlusA
5871 #if defined(__sparc) && defined(COMPILER2)
5872 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5873 #endif
5874 int status = os::Solaris::mutex_lock(_mutex);
5875 assert_status(status == 0, status, "mutex_lock");
5876 guarantee (_nParked == 0, "invariant") ;
5877 ++ _nParked ;
5878 while (_Event < 0) {
5879 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5880 // Treat this the same as if the wait was interrupted
5881 // With usr/lib/lwp going to kernel, always handle ETIME
5882 status = os::Solaris::cond_wait(_cond, _mutex);
5883 if (status == ETIME) status = EINTR ;
5884 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5885 }
5886 -- _nParked ;
5887 _Event = 0 ;
5888 status = os::Solaris::mutex_unlock(_mutex);
5889 assert_status(status == 0, status, "mutex_unlock");
5890 // Paranoia to ensure our locked and lock-free paths interact
5891 // correctly with each other.
5892 OrderAccess::fence();
5893 }
5894 }
5896 int os::PlatformEvent::park(jlong millis) {
5897 guarantee (_nParked == 0, "invariant") ;
5898 int v ;
5899 for (;;) {
5900 v = _Event ;
5901 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5902 }
5903 guarantee (v >= 0, "invariant") ;
5904 if (v != 0) return OS_OK ;
5906 int ret = OS_TIMEOUT;
5907 timestruc_t abst;
5908 compute_abstime (&abst, millis);
5910 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5911 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5912 // Only for SPARC >= V8PlusA
5913 #if defined(__sparc) && defined(COMPILER2)
5914 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5915 #endif
5916 int status = os::Solaris::mutex_lock(_mutex);
5917 assert_status(status == 0, status, "mutex_lock");
5918 guarantee (_nParked == 0, "invariant") ;
5919 ++ _nParked ;
5920 while (_Event < 0) {
5921 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5922 assert_status(status == 0 || status == EINTR ||
5923 status == ETIME || status == ETIMEDOUT,
5924 status, "cond_timedwait");
5925 if (!FilterSpuriousWakeups) break ; // previous semantics
5926 if (status == ETIME || status == ETIMEDOUT) break ;
5927 // We consume and ignore EINTR and spurious wakeups.
5928 }
5929 -- _nParked ;
5930 if (_Event >= 0) ret = OS_OK ;
5931 _Event = 0 ;
5932 status = os::Solaris::mutex_unlock(_mutex);
5933 assert_status(status == 0, status, "mutex_unlock");
5934 // Paranoia to ensure our locked and lock-free paths interact
5935 // correctly with each other.
5936 OrderAccess::fence();
5937 return ret;
5938 }
5940 void os::PlatformEvent::unpark() {
5941 // Transitions for _Event:
5942 // 0 :=> 1
5943 // 1 :=> 1
5944 // -1 :=> either 0 or 1; must signal target thread
5945 // That is, we can safely transition _Event from -1 to either
5946 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
5947 // unpark() calls.
5948 // See also: "Semaphores in Plan 9" by Mullender & Cox
5949 //
5950 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5951 // that it will take two back-to-back park() calls for the owning
5952 // thread to block. This has the benefit of forcing a spurious return
5953 // from the first park() call after an unpark() call which will help
5954 // shake out uses of park() and unpark() without condition variables.
5956 if (Atomic::xchg(1, &_Event) >= 0) return;
5958 // If the thread associated with the event was parked, wake it.
5959 // Wait for the thread assoc with the PlatformEvent to vacate.
5960 int status = os::Solaris::mutex_lock(_mutex);
5961 assert_status(status == 0, status, "mutex_lock");
5962 int AnyWaiters = _nParked;
5963 status = os::Solaris::mutex_unlock(_mutex);
5964 assert_status(status == 0, status, "mutex_unlock");
5965 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5966 if (AnyWaiters != 0) {
5967 // We intentional signal *after* dropping the lock
5968 // to avoid a common class of futile wakeups.
5969 status = os::Solaris::cond_signal(_cond);
5970 assert_status(status == 0, status, "cond_signal");
5971 }
5972 }
5974 // JSR166
5975 // -------------------------------------------------------
5977 /*
5978 * The solaris and linux implementations of park/unpark are fairly
5979 * conservative for now, but can be improved. They currently use a
5980 * mutex/condvar pair, plus _counter.
5981 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5982 * sets count to 1 and signals condvar. Only one thread ever waits
5983 * on the condvar. Contention seen when trying to park implies that someone
5984 * is unparking you, so don't wait. And spurious returns are fine, so there
5985 * is no need to track notifications.
5986 */
5988 #define MAX_SECS 100000000
5989 /*
5990 * This code is common to linux and solaris and will be moved to a
5991 * common place in dolphin.
5992 *
5993 * The passed in time value is either a relative time in nanoseconds
5994 * or an absolute time in milliseconds. Either way it has to be unpacked
5995 * into suitable seconds and nanoseconds components and stored in the
5996 * given timespec structure.
5997 * Given time is a 64-bit value and the time_t used in the timespec is only
5998 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5999 * overflow if times way in the future are given. Further on Solaris versions
6000 * prior to 10 there is a restriction (see cond_timedwait) that the specified
6001 * number of seconds, in abstime, is less than current_time + 100,000,000.
6002 * As it will be 28 years before "now + 100000000" will overflow we can
6003 * ignore overflow and just impose a hard-limit on seconds using the value
6004 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
6005 * years from "now".
6006 */
6007 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
6008 assert (time > 0, "convertTime");
6010 struct timeval now;
6011 int status = gettimeofday(&now, NULL);
6012 assert(status == 0, "gettimeofday");
6014 time_t max_secs = now.tv_sec + MAX_SECS;
6016 if (isAbsolute) {
6017 jlong secs = time / 1000;
6018 if (secs > max_secs) {
6019 absTime->tv_sec = max_secs;
6020 }
6021 else {
6022 absTime->tv_sec = secs;
6023 }
6024 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6025 }
6026 else {
6027 jlong secs = time / NANOSECS_PER_SEC;
6028 if (secs >= MAX_SECS) {
6029 absTime->tv_sec = max_secs;
6030 absTime->tv_nsec = 0;
6031 }
6032 else {
6033 absTime->tv_sec = now.tv_sec + secs;
6034 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6035 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6036 absTime->tv_nsec -= NANOSECS_PER_SEC;
6037 ++absTime->tv_sec; // note: this must be <= max_secs
6038 }
6039 }
6040 }
6041 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6042 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6043 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6044 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6045 }
6047 void Parker::park(bool isAbsolute, jlong time) {
6048 // Ideally we'd do something useful while spinning, such
6049 // as calling unpackTime().
6051 // Optional fast-path check:
6052 // Return immediately if a permit is available.
6053 // We depend on Atomic::xchg() having full barrier semantics
6054 // since we are doing a lock-free update to _counter.
6055 if (Atomic::xchg(0, &_counter) > 0) return;
6057 // Optional fast-exit: Check interrupt before trying to wait
6058 Thread* thread = Thread::current();
6059 assert(thread->is_Java_thread(), "Must be JavaThread");
6060 JavaThread *jt = (JavaThread *)thread;
6061 if (Thread::is_interrupted(thread, false)) {
6062 return;
6063 }
6065 // First, demultiplex/decode time arguments
6066 timespec absTime;
6067 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6068 return;
6069 }
6070 if (time > 0) {
6071 // Warning: this code might be exposed to the old Solaris time
6072 // round-down bugs. Grep "roundingFix" for details.
6073 unpackTime(&absTime, isAbsolute, time);
6074 }
6076 // Enter safepoint region
6077 // Beware of deadlocks such as 6317397.
6078 // The per-thread Parker:: _mutex is a classic leaf-lock.
6079 // In particular a thread must never block on the Threads_lock while
6080 // holding the Parker:: mutex. If safepoints are pending both the
6081 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6082 ThreadBlockInVM tbivm(jt);
6084 // Don't wait if cannot get lock since interference arises from
6085 // unblocking. Also. check interrupt before trying wait
6086 if (Thread::is_interrupted(thread, false) ||
6087 os::Solaris::mutex_trylock(_mutex) != 0) {
6088 return;
6089 }
6091 int status ;
6093 if (_counter > 0) { // no wait needed
6094 _counter = 0;
6095 status = os::Solaris::mutex_unlock(_mutex);
6096 assert (status == 0, "invariant") ;
6097 // Paranoia to ensure our locked and lock-free paths interact
6098 // correctly with each other and Java-level accesses.
6099 OrderAccess::fence();
6100 return;
6101 }
6103 #ifdef ASSERT
6104 // Don't catch signals while blocked; let the running threads have the signals.
6105 // (This allows a debugger to break into the running thread.)
6106 sigset_t oldsigs;
6107 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6108 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6109 #endif
6111 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6112 jt->set_suspend_equivalent();
6113 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6115 // Do this the hard way by blocking ...
6116 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6117 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6118 // Only for SPARC >= V8PlusA
6119 #if defined(__sparc) && defined(COMPILER2)
6120 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6121 #endif
6123 if (time == 0) {
6124 status = os::Solaris::cond_wait (_cond, _mutex) ;
6125 } else {
6126 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6127 }
6128 // Note that an untimed cond_wait() can sometimes return ETIME on older
6129 // versions of the Solaris.
6130 assert_status(status == 0 || status == EINTR ||
6131 status == ETIME || status == ETIMEDOUT,
6132 status, "cond_timedwait");
6134 #ifdef ASSERT
6135 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6136 #endif
6137 _counter = 0 ;
6138 status = os::Solaris::mutex_unlock(_mutex);
6139 assert_status(status == 0, status, "mutex_unlock") ;
6140 // Paranoia to ensure our locked and lock-free paths interact
6141 // correctly with each other and Java-level accesses.
6142 OrderAccess::fence();
6144 // If externally suspended while waiting, re-suspend
6145 if (jt->handle_special_suspend_equivalent_condition()) {
6146 jt->java_suspend_self();
6147 }
6148 }
6150 void Parker::unpark() {
6151 int s, status ;
6152 status = os::Solaris::mutex_lock (_mutex) ;
6153 assert (status == 0, "invariant") ;
6154 s = _counter;
6155 _counter = 1;
6156 status = os::Solaris::mutex_unlock (_mutex) ;
6157 assert (status == 0, "invariant") ;
6159 if (s < 1) {
6160 status = os::Solaris::cond_signal (_cond) ;
6161 assert (status == 0, "invariant") ;
6162 }
6163 }
6165 extern char** environ;
6167 // Run the specified command in a separate process. Return its exit value,
6168 // or -1 on failure (e.g. can't fork a new process).
6169 // Unlike system(), this function can be called from signal handler. It
6170 // doesn't block SIGINT et al.
6171 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
6172 char * argv[4];
6173 argv[0] = (char *)"sh";
6174 argv[1] = (char *)"-c";
6175 argv[2] = cmd;
6176 argv[3] = NULL;
6178 // fork is async-safe, fork1 is not so can't use in signal handler
6179 pid_t pid;
6180 Thread* t = ThreadLocalStorage::get_thread_slow();
6181 if (t != NULL && t->is_inside_signal_handler()) {
6182 pid = fork();
6183 } else {
6184 pid = fork1();
6185 }
6187 if (pid < 0) {
6188 // fork failed
6189 warning("fork failed: %s", strerror(errno));
6190 return -1;
6192 } else if (pid == 0) {
6193 // child process
6195 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6196 execve("/usr/bin/sh", argv, environ);
6198 // execve failed
6199 _exit(-1);
6201 } else {
6202 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6203 // care about the actual exit code, for now.
6205 int status;
6207 // Wait for the child process to exit. This returns immediately if
6208 // the child has already exited. */
6209 while (waitpid(pid, &status, 0) < 0) {
6210 switch (errno) {
6211 case ECHILD: return 0;
6212 case EINTR: break;
6213 default: return -1;
6214 }
6215 }
6217 if (WIFEXITED(status)) {
6218 // The child exited normally; get its exit code.
6219 return WEXITSTATUS(status);
6220 } else if (WIFSIGNALED(status)) {
6221 // The child exited because of a signal
6222 // The best value to return is 0x80 + signal number,
6223 // because that is what all Unix shells do, and because
6224 // it allows callers to distinguish between process exit and
6225 // process death by signal.
6226 return 0x80 + WTERMSIG(status);
6227 } else {
6228 // Unknown exit code; pass it through
6229 return status;
6230 }
6231 }
6232 }
6234 // is_headless_jre()
6235 //
6236 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6237 // in order to report if we are running in a headless jre
6238 //
6239 // Since JDK8 xawt/libmawt.so was moved into the same directory
6240 // as libawt.so, and renamed libawt_xawt.so
6241 //
6242 bool os::is_headless_jre() {
6243 struct stat statbuf;
6244 char buf[MAXPATHLEN];
6245 char libmawtpath[MAXPATHLEN];
6246 const char *xawtstr = "/xawt/libmawt.so";
6247 const char *new_xawtstr = "/libawt_xawt.so";
6248 char *p;
6250 // Get path to libjvm.so
6251 os::jvm_path(buf, sizeof(buf));
6253 // Get rid of libjvm.so
6254 p = strrchr(buf, '/');
6255 if (p == NULL) return false;
6256 else *p = '\0';
6258 // Get rid of client or server
6259 p = strrchr(buf, '/');
6260 if (p == NULL) return false;
6261 else *p = '\0';
6263 // check xawt/libmawt.so
6264 strcpy(libmawtpath, buf);
6265 strcat(libmawtpath, xawtstr);
6266 if (::stat(libmawtpath, &statbuf) == 0) return false;
6268 // check libawt_xawt.so
6269 strcpy(libmawtpath, buf);
6270 strcat(libmawtpath, new_xawtstr);
6271 if (::stat(libmawtpath, &statbuf) == 0) return false;
6273 return true;
6274 }
6276 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6277 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6278 }
6280 int os::close(int fd) {
6281 return ::close(fd);
6282 }
6284 int os::socket_close(int fd) {
6285 return ::close(fd);
6286 }
6288 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6289 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6290 }
6292 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6293 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6294 }
6296 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6297 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6298 }
6300 // As both poll and select can be interrupted by signals, we have to be
6301 // prepared to restart the system call after updating the timeout, unless
6302 // a poll() is done with timeout == -1, in which case we repeat with this
6303 // "wait forever" value.
6305 int os::timeout(int fd, long timeout) {
6306 int res;
6307 struct timeval t;
6308 julong prevtime, newtime;
6309 static const char* aNull = 0;
6310 struct pollfd pfd;
6311 pfd.fd = fd;
6312 pfd.events = POLLIN;
6314 gettimeofday(&t, &aNull);
6315 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6317 for(;;) {
6318 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6319 if(res == OS_ERR && errno == EINTR) {
6320 if(timeout != -1) {
6321 gettimeofday(&t, &aNull);
6322 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6323 timeout -= newtime - prevtime;
6324 if(timeout <= 0)
6325 return OS_OK;
6326 prevtime = newtime;
6327 }
6328 } else return res;
6329 }
6330 }
6332 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6333 int _result;
6334 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6335 os::Solaris::clear_interrupted);
6337 // Depending on when thread interruption is reset, _result could be
6338 // one of two values when errno == EINTR
6340 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6341 && (errno == EINTR)) {
6342 /* restarting a connect() changes its errno semantics */
6343 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6344 os::Solaris::clear_interrupted);
6345 /* undo these changes */
6346 if (_result == OS_ERR) {
6347 if (errno == EALREADY) {
6348 errno = EINPROGRESS; /* fall through */
6349 } else if (errno == EISCONN) {
6350 errno = 0;
6351 return OS_OK;
6352 }
6353 }
6354 }
6355 return _result;
6356 }
6358 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6359 if (fd < 0) {
6360 return OS_ERR;
6361 }
6362 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6363 os::Solaris::clear_interrupted);
6364 }
6366 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6367 sockaddr* from, socklen_t* fromlen) {
6368 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6369 os::Solaris::clear_interrupted);
6370 }
6372 int os::sendto(int fd, char* buf, size_t len, uint flags,
6373 struct sockaddr* to, socklen_t tolen) {
6374 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6375 os::Solaris::clear_interrupted);
6376 }
6378 int os::socket_available(int fd, jint *pbytes) {
6379 if (fd < 0) {
6380 return OS_OK;
6381 }
6382 int ret;
6383 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6384 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6385 // is expected to return 0 on failure and 1 on success to the jdk.
6386 return (ret == OS_ERR) ? 0 : 1;
6387 }
6389 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6390 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6391 os::Solaris::clear_interrupted);
6392 }
6394 // Get the default path to the core file
6395 // Returns the length of the string
6396 int os::get_core_path(char* buffer, size_t bufferSize) {
6397 const char* p = get_current_directory(buffer, bufferSize);
6399 if (p == NULL) {
6400 assert(p != NULL, "failed to get current directory");
6401 return 0;
6402 }
6404 return strlen(buffer);
6405 }
6407 #ifndef PRODUCT
6408 void TestReserveMemorySpecial_test() {
6409 // No tests available for this platform
6410 }
6411 #endif