1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_solaris.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_solaris.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "prims/jniFastGetField.hpp"
41 #include "prims/jvm.h"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/extendedPC.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/interfaceSupport.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/objectMonitor.hpp"
51 #include "runtime/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"
68
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>
110
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>
113
114 #define MAX_PATH (2 * K)
115
116 // for timer info max values which include all bits
117 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
118
119
120 // Here are some liblgrp types from sys/lgrp_user.h to be able to
121 // compile on older systems without this header file.
122
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
129
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
136
137 // see thr_setprio(3T) for the basis of these numbers
138 #define MinimumPriority 0
139 #define NormalPriority 64
140 #define MaximumPriority 127
141
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 };
146
147 // System parameters used internally
148 static clock_t clock_tics_per_sec = 100;
149
150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
151 static bool enabled_extended_FILE_stdio = false;
152
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;
157
158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
160
161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
162
163
164 // "default" initializers for missing libc APIs
165 extern "C" {
166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
168
169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
170 static int lwp_cond_destroy(cond_t *cv) { return 0; }
171 }
172
173 // "default" initializers for pthread-based synchronization
174 extern "C" {
175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
177 }
178
179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
180
181 static inline size_t adjust_stack_size(address base, size_t size) {
182 if ((ssize_t)size < 0) {
183 // 4759953: Compensate for ridiculous stack size.
184 size = max_intx;
185 }
186 if (size > (size_t)base) {
187 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
188 size = (size_t)base;
189 }
190 return size;
191 }
192
193 static inline stack_t get_stack_info() {
194 stack_t st;
195 int retval = thr_stksegment(&st);
196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
197 assert(retval == 0, "incorrect return value from thr_stksegment");
198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
200 return st;
201 }
202
203 bool os::is_primordial_thread(void) {
204 int r = thr_main() ;
205 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
206 return r == 1;
207 }
208
209 address os::current_stack_base() {
210 bool _is_primordial_thread = is_primordial_thread();
211
212 // Workaround 4352906, avoid calls to thr_stksegment by
213 // thr_main after the first one (it looks like we trash
214 // some data, causing the value for ss_sp to be incorrect).
215 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
216 stack_t st = get_stack_info();
217 if (_is_primordial_thread) {
218 // cache initial value of stack base
219 os::Solaris::_main_stack_base = (address)st.ss_sp;
220 }
221 return (address)st.ss_sp;
222 } else {
223 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
224 return os::Solaris::_main_stack_base;
225 }
226 }
227
228 size_t os::current_stack_size() {
229 size_t size;
230
231 if (!is_primordial_thread()) {
232 size = get_stack_info().ss_size;
233 } else {
234 struct rlimit limits;
235 getrlimit(RLIMIT_STACK, &limits);
236 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
237 }
238 // base may not be page aligned
239 address base = current_stack_base();
240 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
241 return (size_t)(base - bottom);
242 }
243
244 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
245 return localtime_r(clock, res);
246 }
247
248 // interruptible infrastructure
249
250 // setup_interruptible saves the thread state before going into an
251 // interruptible system call.
252 // The saved state is used to restore the thread to
253 // its former state whether or not an interrupt is received.
254 // Used by classloader os::read
255 // os::restartable_read calls skip this layer and stay in _thread_in_native
256
257 void os::Solaris::setup_interruptible(JavaThread* thread) {
258
259 JavaThreadState thread_state = thread->thread_state();
260
261 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
262 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
263 OSThread* osthread = thread->osthread();
264 osthread->set_saved_interrupt_thread_state(thread_state);
265 thread->frame_anchor()->make_walkable(thread);
266 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
267 }
268
269 // Version of setup_interruptible() for threads that are already in
270 // _thread_blocked. Used by os_sleep().
271 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
272 thread->frame_anchor()->make_walkable(thread);
273 }
274
275 JavaThread* os::Solaris::setup_interruptible() {
276 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
277 setup_interruptible(thread);
278 return thread;
279 }
280
281 void os::Solaris::try_enable_extended_io() {
282 typedef int (*enable_extended_FILE_stdio_t)(int, int);
283
284 if (!UseExtendedFileIO) {
285 return;
286 }
287
288 enable_extended_FILE_stdio_t enabler =
289 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
290 "enable_extended_FILE_stdio");
291 if (enabler) {
292 enabler(-1, -1);
293 }
294 }
295
296
297 #ifdef ASSERT
298
299 JavaThread* os::Solaris::setup_interruptible_native() {
300 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
301 JavaThreadState thread_state = thread->thread_state();
302 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
303 return thread;
304 }
305
306 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
307 JavaThreadState thread_state = thread->thread_state();
308 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
309 }
310 #endif
311
312 // cleanup_interruptible reverses the effects of setup_interruptible
313 // setup_interruptible_already_blocked() does not need any cleanup.
314
315 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
316 OSThread* osthread = thread->osthread();
317
318 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
319 }
320
321 // I/O interruption related counters called in _INTERRUPTIBLE
322
323 void os::Solaris::bump_interrupted_before_count() {
324 RuntimeService::record_interrupted_before_count();
325 }
326
327 void os::Solaris::bump_interrupted_during_count() {
328 RuntimeService::record_interrupted_during_count();
329 }
330
331 static int _processors_online = 0;
332
333 jint os::Solaris::_os_thread_limit = 0;
334 volatile jint os::Solaris::_os_thread_count = 0;
335
336 julong os::available_memory() {
337 return Solaris::available_memory();
338 }
339
340 julong os::Solaris::available_memory() {
341 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
342 }
343
344 julong os::Solaris::_physical_memory = 0;
345
346 julong os::physical_memory() {
347 return Solaris::physical_memory();
348 }
349
350 static hrtime_t first_hrtime = 0;
351 static const hrtime_t hrtime_hz = 1000*1000*1000;
352 static volatile hrtime_t max_hrtime = 0;
353
354
355 void os::Solaris::initialize_system_info() {
356 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
357 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
358 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
359 }
360
361 int os::active_processor_count() {
362 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
363 pid_t pid = getpid();
364 psetid_t pset = PS_NONE;
365 // Are we running in a processor set or is there any processor set around?
366 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
367 uint_t pset_cpus;
368 // Query the number of cpus available to us.
369 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
370 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
371 _processors_online = pset_cpus;
372 return pset_cpus;
373 }
374 }
375 // Otherwise return number of online cpus
376 return online_cpus;
377 }
378
379 static bool find_processors_in_pset(psetid_t pset,
380 processorid_t** id_array,
381 uint_t* id_length) {
382 bool result = false;
383 // Find the number of processors in the processor set.
384 if (pset_info(pset, NULL, id_length, NULL) == 0) {
385 // Make up an array to hold their ids.
386 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
387 // Fill in the array with their processor ids.
388 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
389 result = true;
390 }
391 }
392 return result;
393 }
394
395 // Callers of find_processors_online() must tolerate imprecise results --
396 // the system configuration can change asynchronously because of DR
397 // or explicit psradm operations.
398 //
399 // We also need to take care that the loop (below) terminates as the
400 // number of processors online can change between the _SC_NPROCESSORS_ONLN
401 // request and the loop that builds the list of processor ids. Unfortunately
402 // there's no reliable way to determine the maximum valid processor id,
403 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
404 // man pages, which claim the processor id set is "sparse, but
405 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
406 // exit the loop.
407 //
408 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
409 // not available on S8.0.
410
411 static bool find_processors_online(processorid_t** id_array,
412 uint* id_length) {
413 const processorid_t MAX_PROCESSOR_ID = 100000 ;
414 // Find the number of processors online.
415 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
416 // Make up an array to hold their ids.
417 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
418 // Processors need not be numbered consecutively.
419 long found = 0;
420 processorid_t next = 0;
421 while (found < *id_length && next < MAX_PROCESSOR_ID) {
422 processor_info_t info;
423 if (processor_info(next, &info) == 0) {
424 // NB, PI_NOINTR processors are effectively online ...
425 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
426 (*id_array)[found] = next;
427 found += 1;
428 }
429 }
430 next += 1;
431 }
432 if (found < *id_length) {
433 // The loop above didn't identify the expected number of processors.
434 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
435 // and re-running the loop, above, but there's no guarantee of progress
436 // if the system configuration is in flux. Instead, we just return what
437 // we've got. Note that in the worst case find_processors_online() could
438 // return an empty set. (As a fall-back in the case of the empty set we
439 // could just return the ID of the current processor).
440 *id_length = found ;
441 }
442
443 return true;
444 }
445
446 static bool assign_distribution(processorid_t* id_array,
447 uint id_length,
448 uint* distribution,
449 uint distribution_length) {
450 // We assume we can assign processorid_t's to uint's.
451 assert(sizeof(processorid_t) == sizeof(uint),
452 "can't convert processorid_t to uint");
453 // Quick check to see if we won't succeed.
454 if (id_length < distribution_length) {
455 return false;
456 }
457 // Assign processor ids to the distribution.
458 // Try to shuffle processors to distribute work across boards,
459 // assuming 4 processors per board.
460 const uint processors_per_board = ProcessDistributionStride;
461 // Find the maximum processor id.
462 processorid_t max_id = 0;
463 for (uint m = 0; m < id_length; m += 1) {
464 max_id = MAX2(max_id, id_array[m]);
465 }
466 // The next id, to limit loops.
467 const processorid_t limit_id = max_id + 1;
468 // Make up markers for available processors.
469 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
470 for (uint c = 0; c < limit_id; c += 1) {
471 available_id[c] = false;
472 }
473 for (uint a = 0; a < id_length; a += 1) {
474 available_id[id_array[a]] = true;
475 }
476 // Step by "boards", then by "slot", copying to "assigned".
477 // NEEDS_CLEANUP: The assignment of processors should be stateful,
478 // remembering which processors have been assigned by
479 // previous calls, etc., so as to distribute several
480 // independent calls of this method. What we'd like is
481 // It would be nice to have an API that let us ask
482 // how many processes are bound to a processor,
483 // but we don't have that, either.
484 // In the short term, "board" is static so that
485 // subsequent distributions don't all start at board 0.
486 static uint board = 0;
487 uint assigned = 0;
488 // Until we've found enough processors ....
489 while (assigned < distribution_length) {
490 // ... find the next available processor in the board.
491 for (uint slot = 0; slot < processors_per_board; slot += 1) {
492 uint try_id = board * processors_per_board + slot;
493 if ((try_id < limit_id) && (available_id[try_id] == true)) {
494 distribution[assigned] = try_id;
495 available_id[try_id] = false;
496 assigned += 1;
497 break;
498 }
499 }
500 board += 1;
501 if (board * processors_per_board + 0 >= limit_id) {
502 board = 0;
503 }
504 }
505 if (available_id != NULL) {
506 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
507 }
508 return true;
509 }
510
511 void os::set_native_thread_name(const char *name) {
512 // Not yet implemented.
513 return;
514 }
515
516 bool os::distribute_processes(uint length, uint* distribution) {
517 bool result = false;
518 // Find the processor id's of all the available CPUs.
519 processorid_t* id_array = NULL;
520 uint id_length = 0;
521 // There are some races between querying information and using it,
522 // since processor sets can change dynamically.
523 psetid_t pset = PS_NONE;
524 // Are we running in a processor set?
525 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
526 result = find_processors_in_pset(pset, &id_array, &id_length);
527 } else {
528 result = find_processors_online(&id_array, &id_length);
529 }
530 if (result == true) {
531 if (id_length >= length) {
532 result = assign_distribution(id_array, id_length, distribution, length);
533 } else {
534 result = false;
535 }
536 }
537 if (id_array != NULL) {
538 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
539 }
540 return result;
541 }
542
543 bool os::bind_to_processor(uint processor_id) {
544 // We assume that a processorid_t can be stored in a uint.
545 assert(sizeof(uint) == sizeof(processorid_t),
546 "can't convert uint to processorid_t");
547 int bind_result =
548 processor_bind(P_LWPID, // bind LWP.
549 P_MYID, // bind current LWP.
550 (processorid_t) processor_id, // id.
551 NULL); // don't return old binding.
552 return (bind_result == 0);
553 }
554
555 bool os::getenv(const char* name, char* buffer, int len) {
556 char* val = ::getenv( name );
557 if ( val == NULL
558 || strlen(val) + 1 > len ) {
559 if (len > 0) buffer[0] = 0; // return a null string
560 return false;
561 }
562 strcpy( buffer, val );
563 return true;
564 }
565
566
567 // Return true if user is running as root.
568
569 bool os::have_special_privileges() {
570 static bool init = false;
571 static bool privileges = false;
572 if (!init) {
573 privileges = (getuid() != geteuid()) || (getgid() != getegid());
574 init = true;
575 }
576 return privileges;
577 }
578
579
580 void os::init_system_properties_values() {
581 // The next steps are taken in the product version:
582 //
583 // Obtain the JAVA_HOME value from the location of libjvm.so.
584 // This library should be located at:
585 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
586 //
587 // If "/jre/lib/" appears at the right place in the path, then we
588 // assume libjvm.so is installed in a JDK and we use this path.
589 //
590 // Otherwise exit with message: "Could not create the Java virtual machine."
591 //
592 // The following extra steps are taken in the debugging version:
593 //
594 // If "/jre/lib/" does NOT appear at the right place in the path
595 // instead of exit check for $JAVA_HOME environment variable.
596 //
597 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
598 // then we append a fake suffix "hotspot/libjvm.so" to this path so
599 // it looks like libjvm.so is installed there
600 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
601 //
602 // Otherwise exit.
603 //
604 // Important note: if the location of libjvm.so changes this
605 // code needs to be changed accordingly.
606
607 // Base path of extensions installed on the system.
608 #define SYS_EXT_DIR "/usr/jdk/packages"
609 #define EXTENSIONS_DIR "/lib/ext"
610 #define ENDORSED_DIR "/lib/endorsed"
611
612 char cpu_arch[12];
613 // Buffer that fits several sprintfs.
614 // Note that the space for the colon and the trailing null are provided
615 // by the nulls included by the sizeof operator.
616 const size_t bufsize =
617 MAX4((size_t)MAXPATHLEN, // For dll_dir & friends.
618 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
619 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
620 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
621 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
622
623 // sysclasspath, java_home, dll_dir
624 {
625 char *pslash;
626 os::jvm_path(buf, bufsize);
627
628 // Found the full path to libjvm.so.
629 // Now cut the path to <java_home>/jre if we can.
630 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
631 pslash = strrchr(buf, '/');
632 if (pslash != NULL) {
633 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
634 }
635 Arguments::set_dll_dir(buf);
636
637 if (pslash != NULL) {
638 pslash = strrchr(buf, '/');
639 if (pslash != NULL) {
640 *pslash = '\0'; // Get rid of /<arch>.
641 pslash = strrchr(buf, '/');
642 if (pslash != NULL) {
643 *pslash = '\0'; // Get rid of /lib.
644 }
645 }
646 }
647 Arguments::set_java_home(buf);
648 set_boot_path('/', ':');
649 }
650
651 // Where to look for native libraries.
652 {
653 // Use dlinfo() to determine the correct java.library.path.
654 //
655 // If we're launched by the Java launcher, and the user
656 // does not set java.library.path explicitly on the commandline,
657 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
658 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
659 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
660 // /usr/lib), which is exactly what we want.
661 //
662 // If the user does set java.library.path, it completely
663 // overwrites this setting, and always has.
664 //
665 // If we're not launched by the Java launcher, we may
666 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
667 // settings. Again, dlinfo does exactly what we want.
668
669 Dl_serinfo info_sz, *info = &info_sz;
670 Dl_serpath *path;
671 char *library_path;
672 char *common_path = buf;
673
674 // Determine search path count and required buffer size.
675 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
676 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
677 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
678 }
679
680 // Allocate new buffer and initialize.
681 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
682 info->dls_size = info_sz.dls_size;
683 info->dls_cnt = info_sz.dls_cnt;
684
685 // Obtain search path information.
686 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
687 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
688 FREE_C_HEAP_ARRAY(char, info, mtInternal);
689 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
690 }
691
692 path = &info->dls_serpath[0];
693
694 // Note: Due to a legacy implementation, most of the library path
695 // is set in the launcher. This was to accomodate linking restrictions
696 // on legacy Solaris implementations (which are no longer supported).
697 // Eventually, all the library path setting will be done here.
698 //
699 // However, to prevent the proliferation of improperly built native
700 // libraries, the new path component /usr/jdk/packages is added here.
701
702 // Determine the actual CPU architecture.
703 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
704 #ifdef _LP64
705 // If we are a 64-bit vm, perform the following translations:
706 // sparc -> sparcv9
707 // i386 -> amd64
708 if (strcmp(cpu_arch, "sparc") == 0) {
709 strcat(cpu_arch, "v9");
710 } else if (strcmp(cpu_arch, "i386") == 0) {
711 strcpy(cpu_arch, "amd64");
712 }
713 #endif
714
715 // Construct the invariant part of ld_library_path.
716 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
717
718 // Struct size is more than sufficient for the path components obtained
719 // through the dlinfo() call, so only add additional space for the path
720 // components explicitly added here.
721 size_t library_path_size = info->dls_size + strlen(common_path);
722 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
723 library_path[0] = '\0';
724
725 // Construct the desired Java library path from the linker's library
726 // search path.
727 //
728 // For compatibility, it is optimal that we insert the additional path
729 // components specific to the Java VM after those components specified
730 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
731 // infrastructure.
732 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
733 strcpy(library_path, common_path);
734 } else {
735 int inserted = 0;
736 int i;
737 for (i = 0; i < info->dls_cnt; i++, path++) {
738 uint_t flags = path->dls_flags & LA_SER_MASK;
739 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
740 strcat(library_path, common_path);
741 strcat(library_path, os::path_separator());
742 inserted = 1;
743 }
744 strcat(library_path, path->dls_name);
745 strcat(library_path, os::path_separator());
746 }
747 // Eliminate trailing path separator.
748 library_path[strlen(library_path)-1] = '\0';
749 }
750
751 // happens before argument parsing - can't use a trace flag
752 // tty->print_raw("init_system_properties_values: native lib path: ");
753 // tty->print_raw_cr(library_path);
754
755 // Callee copies into its own buffer.
756 Arguments::set_library_path(library_path);
757
758 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
759 FREE_C_HEAP_ARRAY(char, info, mtInternal);
760 }
761
762 // Extensions directories.
763 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
764 Arguments::set_ext_dirs(buf);
765
766 // Endorsed standards default directory.
767 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
768 Arguments::set_endorsed_dirs(buf);
769
770 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
771
772 #undef SYS_EXT_DIR
773 #undef EXTENSIONS_DIR
774 #undef ENDORSED_DIR
775 }
776
777 void os::breakpoint() {
778 BREAKPOINT;
779 }
780
781 bool os::obsolete_option(const JavaVMOption *option)
782 {
783 if (!strncmp(option->optionString, "-Xt", 3)) {
784 return true;
785 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
786 return true;
787 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
788 return true;
789 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
790 return true;
791 }
792 return false;
793 }
794
795 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
796 address stackStart = (address)thread->stack_base();
797 address stackEnd = (address)(stackStart - (address)thread->stack_size());
798 if (sp < stackStart && sp >= stackEnd ) return true;
799 return false;
800 }
801
802 extern "C" void breakpoint() {
803 // use debugger to set breakpoint here
804 }
805
806 static thread_t main_thread;
807
808 // Thread start routine for all new Java threads
809 extern "C" void* java_start(void* thread_addr) {
810 // Try to randomize the cache line index of hot stack frames.
811 // This helps when threads of the same stack traces evict each other's
812 // cache lines. The threads can be either from the same JVM instance, or
813 // from different JVM instances. The benefit is especially true for
814 // processors with hyperthreading technology.
815 static int counter = 0;
816 int pid = os::current_process_id();
817 alloca(((pid ^ counter++) & 7) * 128);
818
819 int prio;
820 Thread* thread = (Thread*)thread_addr;
821 OSThread* osthr = thread->osthread();
822
823 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
824 thread->_schedctl = (void *) schedctl_init () ;
825
826 if (UseNUMA) {
827 int lgrp_id = os::numa_get_group_id();
828 if (lgrp_id != -1) {
829 thread->set_lgrp_id(lgrp_id);
830 }
831 }
832
833 // If the creator called set priority before we started,
834 // we need to call set_native_priority now that we have an lwp.
835 // We used to get the priority from thr_getprio (we called
836 // thr_setprio way back in create_thread) and pass it to
837 // set_native_priority, but Solaris scales the priority
838 // in java_to_os_priority, so when we read it back here,
839 // we pass trash to set_native_priority instead of what's
840 // in java_to_os_priority. So we save the native priority
841 // in the osThread and recall it here.
842
843 if ( osthr->thread_id() != -1 ) {
844 if ( UseThreadPriorities ) {
845 int prio = osthr->native_priority();
846 if (ThreadPriorityVerbose) {
847 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
848 INTPTR_FORMAT ", setting priority: %d\n",
849 osthr->thread_id(), osthr->lwp_id(), prio);
850 }
851 os::set_native_priority(thread, prio);
852 }
853 } else if (ThreadPriorityVerbose) {
854 warning("Can't set priority in _start routine, thread id hasn't been set\n");
855 }
856
857 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
858
859 // initialize signal mask for this thread
860 os::Solaris::hotspot_sigmask(thread);
861
862 thread->run();
863
864 // One less thread is executing
865 // When the VMThread gets here, the main thread may have already exited
866 // which frees the CodeHeap containing the Atomic::dec code
867 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
868 Atomic::dec(&os::Solaris::_os_thread_count);
869 }
870
871 if (UseDetachedThreads) {
872 thr_exit(NULL);
873 ShouldNotReachHere();
874 }
875 return NULL;
876 }
877
878 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
879 // Allocate the OSThread object
880 OSThread* osthread = new OSThread(NULL, NULL);
881 if (osthread == NULL) return NULL;
882
883 // Store info on the Solaris thread into the OSThread
884 osthread->set_thread_id(thread_id);
885 osthread->set_lwp_id(_lwp_self());
886 thread->_schedctl = (void *) schedctl_init () ;
887
888 if (UseNUMA) {
889 int lgrp_id = os::numa_get_group_id();
890 if (lgrp_id != -1) {
891 thread->set_lgrp_id(lgrp_id);
892 }
893 }
894
895 if ( ThreadPriorityVerbose ) {
896 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
897 osthread->thread_id(), osthread->lwp_id() );
898 }
899
900 // Initial thread state is INITIALIZED, not SUSPENDED
901 osthread->set_state(INITIALIZED);
902
903 return osthread;
904 }
905
906 void os::Solaris::hotspot_sigmask(Thread* thread) {
907
908 //Save caller's signal mask
909 sigset_t sigmask;
910 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
911 OSThread *osthread = thread->osthread();
912 osthread->set_caller_sigmask(sigmask);
913
914 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
915 if (!ReduceSignalUsage) {
916 if (thread->is_VM_thread()) {
917 // Only the VM thread handles BREAK_SIGNAL ...
918 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
919 } else {
920 // ... all other threads block BREAK_SIGNAL
921 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
922 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
923 }
924 }
925 }
926
927 bool os::create_attached_thread(JavaThread* thread) {
928 #ifdef ASSERT
929 thread->verify_not_published();
930 #endif
931 OSThread* osthread = create_os_thread(thread, thr_self());
932 if (osthread == NULL) {
933 return false;
934 }
935
936 // Initial thread state is RUNNABLE
937 osthread->set_state(RUNNABLE);
938 thread->set_osthread(osthread);
939
940 // initialize signal mask for this thread
941 // and save the caller's signal mask
942 os::Solaris::hotspot_sigmask(thread);
943
944 return true;
945 }
946
947 bool os::create_main_thread(JavaThread* thread) {
948 #ifdef ASSERT
949 thread->verify_not_published();
950 #endif
951 if (_starting_thread == NULL) {
952 _starting_thread = create_os_thread(thread, main_thread);
953 if (_starting_thread == NULL) {
954 return false;
955 }
956 }
957
958 // The primodial thread is runnable from the start
959 _starting_thread->set_state(RUNNABLE);
960
961 thread->set_osthread(_starting_thread);
962
963 // initialize signal mask for this thread
964 // and save the caller's signal mask
965 os::Solaris::hotspot_sigmask(thread);
966
967 return true;
968 }
969
970 // _T2_libthread is true if we believe we are running with the newer
971 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
972 bool os::Solaris::_T2_libthread = false;
973
974 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
975 // Allocate the OSThread object
976 OSThread* osthread = new OSThread(NULL, NULL);
977 if (osthread == NULL) {
978 return false;
979 }
980
981 if ( ThreadPriorityVerbose ) {
982 char *thrtyp;
983 switch ( thr_type ) {
984 case vm_thread:
985 thrtyp = (char *)"vm";
986 break;
987 case cgc_thread:
988 thrtyp = (char *)"cgc";
989 break;
990 case pgc_thread:
991 thrtyp = (char *)"pgc";
992 break;
993 case java_thread:
994 thrtyp = (char *)"java";
995 break;
996 case compiler_thread:
997 thrtyp = (char *)"compiler";
998 break;
999 case watcher_thread:
1000 thrtyp = (char *)"watcher";
1001 break;
1002 default:
1003 thrtyp = (char *)"unknown";
1004 break;
1005 }
1006 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1007 }
1008
1009 // Calculate stack size if it's not specified by caller.
1010 if (stack_size == 0) {
1011 // The default stack size 1M (2M for LP64).
1012 stack_size = (BytesPerWord >> 2) * K * K;
1013
1014 switch (thr_type) {
1015 case os::java_thread:
1016 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1017 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1018 break;
1019 case os::compiler_thread:
1020 if (CompilerThreadStackSize > 0) {
1021 stack_size = (size_t)(CompilerThreadStackSize * K);
1022 break;
1023 } // else fall through:
1024 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1025 case os::vm_thread:
1026 case os::pgc_thread:
1027 case os::cgc_thread:
1028 case os::watcher_thread:
1029 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1030 break;
1031 }
1032 }
1033 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1034
1035 // Initial state is ALLOCATED but not INITIALIZED
1036 osthread->set_state(ALLOCATED);
1037
1038 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1039 // We got lots of threads. Check if we still have some address space left.
1040 // Need to be at least 5Mb of unreserved address space. We do check by
1041 // trying to reserve some.
1042 const size_t VirtualMemoryBangSize = 20*K*K;
1043 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1044 if (mem == NULL) {
1045 delete osthread;
1046 return false;
1047 } else {
1048 // Release the memory again
1049 os::release_memory(mem, VirtualMemoryBangSize);
1050 }
1051 }
1052
1053 // Setup osthread because the child thread may need it.
1054 thread->set_osthread(osthread);
1055
1056 // Create the Solaris thread
1057 // explicit THR_BOUND for T2_libthread case in case
1058 // that assumption is not accurate, but our alternate signal stack
1059 // handling is based on it which must have bound threads
1060 thread_t tid = 0;
1061 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1062 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1063 (thr_type == vm_thread) ||
1064 (thr_type == cgc_thread) ||
1065 (thr_type == pgc_thread) ||
1066 (thr_type == compiler_thread && BackgroundCompilation)) ?
1067 THR_BOUND : 0);
1068 int status;
1069
1070 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1071 //
1072 // On multiprocessors systems, libthread sometimes under-provisions our
1073 // process with LWPs. On a 30-way systems, for instance, we could have
1074 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1075 // to our process. This can result in under utilization of PEs.
1076 // I suspect the problem is related to libthread's LWP
1077 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1078 // upcall policy.
1079 //
1080 // The following code is palliative -- it attempts to ensure that our
1081 // process has sufficient LWPs to take advantage of multiple PEs.
1082 // Proper long-term cures include using user-level threads bound to LWPs
1083 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1084 // slight timing window with respect to sampling _os_thread_count, but
1085 // the race is benign. Also, we should periodically recompute
1086 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1087 // the number of PEs in our partition. You might be tempted to use
1088 // THR_NEW_LWP here, but I'd recommend against it as that could
1089 // result in undesirable growth of the libthread's LWP pool.
1090 // The fix below isn't sufficient; for instance, it doesn't take into count
1091 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1092 //
1093 // Some pathologies this scheme doesn't handle:
1094 // * Threads can block, releasing the LWPs. The LWPs can age out.
1095 // When a large number of threads become ready again there aren't
1096 // enough LWPs available to service them. This can occur when the
1097 // number of ready threads oscillates.
1098 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1099 //
1100 // Finally, we should call thr_setconcurrency() periodically to refresh
1101 // the LWP pool and thwart the LWP age-out mechanism.
1102 // The "+3" term provides a little slop -- we want to slightly overprovision.
1103
1104 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1105 if (!(flags & THR_BOUND)) {
1106 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1107 }
1108 }
1109 // Although this doesn't hurt, we should warn of undefined behavior
1110 // when using unbound T1 threads with schedctl(). This should never
1111 // happen, as the compiler and VM threads are always created bound
1112 DEBUG_ONLY(
1113 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1114 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1115 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1116 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1117 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1118 }
1119 );
1120
1121
1122 // Mark that we don't have an lwp or thread id yet.
1123 // In case we attempt to set the priority before the thread starts.
1124 osthread->set_lwp_id(-1);
1125 osthread->set_thread_id(-1);
1126
1127 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1128 if (status != 0) {
1129 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1130 perror("os::create_thread");
1131 }
1132 thread->set_osthread(NULL);
1133 // Need to clean up stuff we've allocated so far
1134 delete osthread;
1135 return false;
1136 }
1137
1138 Atomic::inc(&os::Solaris::_os_thread_count);
1139
1140 // Store info on the Solaris thread into the OSThread
1141 osthread->set_thread_id(tid);
1142
1143 // Remember that we created this thread so we can set priority on it
1144 osthread->set_vm_created();
1145
1146 // Set the default thread priority. If using bound threads, setting
1147 // lwp priority will be delayed until thread start.
1148 set_native_priority(thread,
1149 DefaultThreadPriority == -1 ?
1150 java_to_os_priority[NormPriority] :
1151 DefaultThreadPriority);
1152
1153 // Initial thread state is INITIALIZED, not SUSPENDED
1154 osthread->set_state(INITIALIZED);
1155
1156 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1157 return true;
1158 }
1159
1160 /* defined for >= Solaris 10. This allows builds on earlier versions
1161 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1162 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1163 * and -XX:+UseAltSigs does nothing since these should have no conflict
1164 */
1165 #if !defined(SIGJVM1)
1166 #define SIGJVM1 39
1167 #define SIGJVM2 40
1168 #endif
1169
1170 debug_only(static bool signal_sets_initialized = false);
1171 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1172 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1173 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1174
1175 bool os::Solaris::is_sig_ignored(int sig) {
1176 struct sigaction oact;
1177 sigaction(sig, (struct sigaction*)NULL, &oact);
1178 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1179 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1180 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1181 return true;
1182 else
1183 return false;
1184 }
1185
1186 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1187 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1188 static bool isJVM1available() {
1189 return SIGJVM1 < SIGRTMIN;
1190 }
1191
1192 void os::Solaris::signal_sets_init() {
1193 // Should also have an assertion stating we are still single-threaded.
1194 assert(!signal_sets_initialized, "Already initialized");
1195 // Fill in signals that are necessarily unblocked for all threads in
1196 // the VM. Currently, we unblock the following signals:
1197 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1198 // by -Xrs (=ReduceSignalUsage));
1199 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1200 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1201 // the dispositions or masks wrt these signals.
1202 // Programs embedding the VM that want to use the above signals for their
1203 // own purposes must, at this time, use the "-Xrs" option to prevent
1204 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1205 // (See bug 4345157, and other related bugs).
1206 // In reality, though, unblocking these signals is really a nop, since
1207 // these signals are not blocked by default.
1208 sigemptyset(&unblocked_sigs);
1209 sigemptyset(&allowdebug_blocked_sigs);
1210 sigaddset(&unblocked_sigs, SIGILL);
1211 sigaddset(&unblocked_sigs, SIGSEGV);
1212 sigaddset(&unblocked_sigs, SIGBUS);
1213 sigaddset(&unblocked_sigs, SIGFPE);
1214
1215 if (isJVM1available) {
1216 os::Solaris::set_SIGinterrupt(SIGJVM1);
1217 os::Solaris::set_SIGasync(SIGJVM2);
1218 } else if (UseAltSigs) {
1219 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1220 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1221 } else {
1222 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1223 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1224 }
1225
1226 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1227 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1228
1229 if (!ReduceSignalUsage) {
1230 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1231 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1232 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1233 }
1234 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1235 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1236 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1237 }
1238 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1239 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1240 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1241 }
1242 }
1243 // Fill in signals that are blocked by all but the VM thread.
1244 sigemptyset(&vm_sigs);
1245 if (!ReduceSignalUsage)
1246 sigaddset(&vm_sigs, BREAK_SIGNAL);
1247 debug_only(signal_sets_initialized = true);
1248
1249 // For diagnostics only used in run_periodic_checks
1250 sigemptyset(&check_signal_done);
1251 }
1252
1253 // These are signals that are unblocked while a thread is running Java.
1254 // (For some reason, they get blocked by default.)
1255 sigset_t* os::Solaris::unblocked_signals() {
1256 assert(signal_sets_initialized, "Not initialized");
1257 return &unblocked_sigs;
1258 }
1259
1260 // These are the signals that are blocked while a (non-VM) thread is
1261 // running Java. Only the VM thread handles these signals.
1262 sigset_t* os::Solaris::vm_signals() {
1263 assert(signal_sets_initialized, "Not initialized");
1264 return &vm_sigs;
1265 }
1266
1267 // These are signals that are blocked during cond_wait to allow debugger in
1268 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1269 assert(signal_sets_initialized, "Not initialized");
1270 return &allowdebug_blocked_sigs;
1271 }
1272
1273
1274 void _handle_uncaught_cxx_exception() {
1275 VMError err("An uncaught C++ exception");
1276 err.report_and_die();
1277 }
1278
1279
1280 // First crack at OS-specific initialization, from inside the new thread.
1281 void os::initialize_thread(Thread* thr) {
1282 if (is_primordial_thread()) {
1283 JavaThread* jt = (JavaThread *)thr;
1284 assert(jt != NULL,"Sanity check");
1285 size_t stack_size;
1286 address base = jt->stack_base();
1287 if (Arguments::created_by_java_launcher()) {
1288 // Use 2MB to allow for Solaris 7 64 bit mode.
1289 stack_size = JavaThread::stack_size_at_create() == 0
1290 ? 2048*K : JavaThread::stack_size_at_create();
1291
1292 // There are rare cases when we may have already used more than
1293 // the basic stack size allotment before this method is invoked.
1294 // Attempt to allow for a normally sized java_stack.
1295 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1296 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1297 } else {
1298 // 6269555: If we were not created by a Java launcher, i.e. if we are
1299 // running embedded in a native application, treat the primordial thread
1300 // as much like a native attached thread as possible. This means using
1301 // the current stack size from thr_stksegment(), unless it is too large
1302 // to reliably setup guard pages. A reasonable max size is 8MB.
1303 size_t current_size = current_stack_size();
1304 // This should never happen, but just in case....
1305 if (current_size == 0) current_size = 2 * K * K;
1306 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1307 }
1308 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1309 stack_size = (size_t)(base - bottom);
1310
1311 assert(stack_size > 0, "Stack size calculation problem");
1312
1313 if (stack_size > jt->stack_size()) {
1314 NOT_PRODUCT(
1315 struct rlimit limits;
1316 getrlimit(RLIMIT_STACK, &limits);
1317 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1318 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1319 )
1320 tty->print_cr(
1321 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1322 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1323 "See limit(1) to increase the stack size limit.",
1324 stack_size / K, jt->stack_size() / K);
1325 vm_exit(1);
1326 }
1327 assert(jt->stack_size() >= stack_size,
1328 "Attempt to map more stack than was allocated");
1329 jt->set_stack_size(stack_size);
1330 }
1331
1332 // 5/22/01: Right now alternate signal stacks do not handle
1333 // throwing stack overflow exceptions, see bug 4463178
1334 // Until a fix is found for this, T2 will NOT imply alternate signal
1335 // stacks.
1336 // If using T2 libthread threads, install an alternate signal stack.
1337 // Because alternate stacks associate with LWPs on Solaris,
1338 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads
1339 // we prefer to explicitly stack bang.
1340 // If not using T2 libthread, but using UseBoundThreads any threads
1341 // (primordial thread, jni_attachCurrentThread) we do not create,
1342 // probably are not bound, therefore they can not have an alternate
1343 // signal stack. Since our stack banging code is generated and
1344 // is shared across threads, all threads must be bound to allow
1345 // using alternate signal stacks. The alternative is to interpose
1346 // on _lwp_create to associate an alt sig stack with each LWP,
1347 // and this could be a problem when the JVM is embedded.
1348 // We would prefer to use alternate signal stacks with T2
1349 // Since there is currently no accurate way to detect T2
1350 // we do not. Assuming T2 when running T1 causes sig 11s or assertions
1351 // on installing alternate signal stacks
1352
1353
1354 // 05/09/03: removed alternate signal stack support for Solaris
1355 // The alternate signal stack mechanism is no longer needed to
1356 // handle stack overflow. This is now handled by allocating
1357 // guard pages (red zone) and stackbanging.
1358 // Initially the alternate signal stack mechanism was removed because
1359 // it did not work with T1 llibthread. Alternate
1360 // signal stacks MUST have all threads bound to lwps. Applications
1361 // can create their own threads and attach them without their being
1362 // bound under T1. This is frequently the case for the primordial thread.
1363 // If we were ever to reenable this mechanism we would need to
1364 // use the dynamic check for T2 libthread.
1365
1366 os::Solaris::init_thread_fpu_state();
1367 std::set_terminate(_handle_uncaught_cxx_exception);
1368 }
1369
1370
1371
1372 // Free Solaris resources related to the OSThread
1373 void os::free_thread(OSThread* osthread) {
1374 assert(osthread != NULL, "os::free_thread but osthread not set");
1375
1376
1377 // We are told to free resources of the argument thread,
1378 // but we can only really operate on the current thread.
1379 // The main thread must take the VMThread down synchronously
1380 // before the main thread exits and frees up CodeHeap
1381 guarantee((Thread::current()->osthread() == osthread
1382 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1383 if (Thread::current()->osthread() == osthread) {
1384 // Restore caller's signal mask
1385 sigset_t sigmask = osthread->caller_sigmask();
1386 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1387 }
1388 delete osthread;
1389 }
1390
1391 void os::pd_start_thread(Thread* thread) {
1392 int status = thr_continue(thread->osthread()->thread_id());
1393 assert_status(status == 0, status, "thr_continue failed");
1394 }
1395
1396
1397 intx os::current_thread_id() {
1398 return (intx)thr_self();
1399 }
1400
1401 static pid_t _initial_pid = 0;
1402
1403 int os::current_process_id() {
1404 return (int)(_initial_pid ? _initial_pid : getpid());
1405 }
1406
1407 // gethrtime() should be monotonic according to the documentation,
1408 // but some virtualized platforms are known to break this guarantee.
1409 // getTimeNanos() must be guaranteed not to move backwards, so we
1410 // are forced to add a check here.
1411 inline hrtime_t getTimeNanos() {
1412 const hrtime_t now = gethrtime();
1413 const hrtime_t prev = max_hrtime;
1414 if (now <= prev) {
1415 return prev; // same or retrograde time;
1416 }
1417 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1418 assert(obsv >= prev, "invariant"); // Monotonicity
1419 // If the CAS succeeded then we're done and return "now".
1420 // If the CAS failed and the observed value "obsv" is >= now then
1421 // we should return "obsv". If the CAS failed and now > obsv > prv then
1422 // some other thread raced this thread and installed a new value, in which case
1423 // we could either (a) retry the entire operation, (b) retry trying to install now
1424 // or (c) just return obsv. We use (c). No loop is required although in some cases
1425 // we might discard a higher "now" value in deference to a slightly lower but freshly
1426 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1427 // to (a) or (b) -- and greatly reduces coherence traffic.
1428 // We might also condition (c) on the magnitude of the delta between obsv and now.
1429 // Avoiding excessive CAS operations to hot RW locations is critical.
1430 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1431 return (prev == obsv) ? now : obsv;
1432 }
1433
1434 // Time since start-up in seconds to a fine granularity.
1435 // Used by VMSelfDestructTimer and the MemProfiler.
1436 double os::elapsedTime() {
1437 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1438 }
1439
1440 jlong os::elapsed_counter() {
1441 return (jlong)(getTimeNanos() - first_hrtime);
1442 }
1443
1444 jlong os::elapsed_frequency() {
1445 return hrtime_hz;
1446 }
1447
1448 // Return the real, user, and system times in seconds from an
1449 // arbitrary fixed point in the past.
1450 bool os::getTimesSecs(double* process_real_time,
1451 double* process_user_time,
1452 double* process_system_time) {
1453 struct tms ticks;
1454 clock_t real_ticks = times(&ticks);
1455
1456 if (real_ticks == (clock_t) (-1)) {
1457 return false;
1458 } else {
1459 double ticks_per_second = (double) clock_tics_per_sec;
1460 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1461 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1462 // For consistency return the real time from getTimeNanos()
1463 // converted to seconds.
1464 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1465
1466 return true;
1467 }
1468 }
1469
1470 bool os::supports_vtime() { return true; }
1471
1472 bool os::enable_vtime() {
1473 int fd = ::open("/proc/self/ctl", O_WRONLY);
1474 if (fd == -1)
1475 return false;
1476
1477 long cmd[] = { PCSET, PR_MSACCT };
1478 int res = ::write(fd, cmd, sizeof(long) * 2);
1479 ::close(fd);
1480 if (res != sizeof(long) * 2)
1481 return false;
1482
1483 return true;
1484 }
1485
1486 bool os::vtime_enabled() {
1487 int fd = ::open("/proc/self/status", O_RDONLY);
1488 if (fd == -1)
1489 return false;
1490
1491 pstatus_t status;
1492 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1493 ::close(fd);
1494 if (res != sizeof(pstatus_t))
1495 return false;
1496
1497 return status.pr_flags & PR_MSACCT;
1498 }
1499
1500 double os::elapsedVTime() {
1501 return (double)gethrvtime() / (double)hrtime_hz;
1502 }
1503
1504 // Used internally for comparisons only
1505 // getTimeMillis guaranteed to not move backwards on Solaris
1506 jlong getTimeMillis() {
1507 jlong nanotime = getTimeNanos();
1508 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1509 }
1510
1511 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1512 jlong os::javaTimeMillis() {
1513 timeval t;
1514 if (gettimeofday( &t, NULL) == -1)
1515 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1516 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1517 }
1518
1519 jlong os::javaTimeNanos() {
1520 return (jlong)getTimeNanos();
1521 }
1522
1523 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1524 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1525 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1526 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1527 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1528 }
1529
1530 char * os::local_time_string(char *buf, size_t buflen) {
1531 struct tm t;
1532 time_t long_time;
1533 time(&long_time);
1534 localtime_r(&long_time, &t);
1535 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1536 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1537 t.tm_hour, t.tm_min, t.tm_sec);
1538 return buf;
1539 }
1540
1541 // Note: os::shutdown() might be called very early during initialization, or
1542 // called from signal handler. Before adding something to os::shutdown(), make
1543 // sure it is async-safe and can handle partially initialized VM.
1544 void os::shutdown() {
1545
1546 // allow PerfMemory to attempt cleanup of any persistent resources
1547 perfMemory_exit();
1548
1549 // needs to remove object in file system
1550 AttachListener::abort();
1551
1552 // flush buffered output, finish log files
1553 ostream_abort();
1554
1555 // Check for abort hook
1556 abort_hook_t abort_hook = Arguments::abort_hook();
1557 if (abort_hook != NULL) {
1558 abort_hook();
1559 }
1560 }
1561
1562 // Note: os::abort() might be called very early during initialization, or
1563 // called from signal handler. Before adding something to os::abort(), make
1564 // sure it is async-safe and can handle partially initialized VM.
1565 void os::abort(bool dump_core) {
1566 os::shutdown();
1567 if (dump_core) {
1568 #ifndef PRODUCT
1569 fdStream out(defaultStream::output_fd());
1570 out.print_raw("Current thread is ");
1571 char buf[16];
1572 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1573 out.print_raw_cr(buf);
1574 out.print_raw_cr("Dumping core ...");
1575 #endif
1576 ::abort(); // dump core (for debugging)
1577 }
1578
1579 ::exit(1);
1580 }
1581
1582 // Die immediately, no exit hook, no abort hook, no cleanup.
1583 void os::die() {
1584 ::abort(); // dump core (for debugging)
1585 }
1586
1587 // DLL functions
1588
1589 const char* os::dll_file_extension() { return ".so"; }
1590
1591 // This must be hard coded because it's the system's temporary
1592 // directory not the java application's temp directory, ala java.io.tmpdir.
1593 const char* os::get_temp_directory() { return "/tmp"; }
1594
1595 static bool file_exists(const char* filename) {
1596 struct stat statbuf;
1597 if (filename == NULL || strlen(filename) == 0) {
1598 return false;
1599 }
1600 return os::stat(filename, &statbuf) == 0;
1601 }
1602
1603 bool os::dll_build_name(char* buffer, size_t buflen,
1604 const char* pname, const char* fname) {
1605 bool retval = false;
1606 const size_t pnamelen = pname ? strlen(pname) : 0;
1607
1608 // Return error on buffer overflow.
1609 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1610 return retval;
1611 }
1612
1613 if (pnamelen == 0) {
1614 snprintf(buffer, buflen, "lib%s.so", fname);
1615 retval = true;
1616 } else if (strchr(pname, *os::path_separator()) != NULL) {
1617 int n;
1618 char** pelements = split_path(pname, &n);
1619 if (pelements == NULL) {
1620 return false;
1621 }
1622 for (int i = 0 ; i < n ; i++) {
1623 // really shouldn't be NULL but what the heck, check can't hurt
1624 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1625 continue; // skip the empty path values
1626 }
1627 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1628 if (file_exists(buffer)) {
1629 retval = true;
1630 break;
1631 }
1632 }
1633 // release the storage
1634 for (int i = 0 ; i < n ; i++) {
1635 if (pelements[i] != NULL) {
1636 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1637 }
1638 }
1639 if (pelements != NULL) {
1640 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1641 }
1642 } else {
1643 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1644 retval = true;
1645 }
1646 return retval;
1647 }
1648
1649 // check if addr is inside libjvm.so
1650 bool os::address_is_in_vm(address addr) {
1651 static address libjvm_base_addr;
1652 Dl_info dlinfo;
1653
1654 if (libjvm_base_addr == NULL) {
1655 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1656 libjvm_base_addr = (address)dlinfo.dli_fbase;
1657 }
1658 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1659 }
1660
1661 if (dladdr((void *)addr, &dlinfo) != 0) {
1662 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1663 }
1664
1665 return false;
1666 }
1667
1668 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1669 static dladdr1_func_type dladdr1_func = NULL;
1670
1671 bool os::dll_address_to_function_name(address addr, char *buf,
1672 int buflen, int * offset) {
1673 // buf is not optional, but offset is optional
1674 assert(buf != NULL, "sanity check");
1675
1676 Dl_info dlinfo;
1677
1678 // dladdr1_func was initialized in os::init()
1679 if (dladdr1_func != NULL) {
1680 // yes, we have dladdr1
1681
1682 // Support for dladdr1 is checked at runtime; it may be
1683 // available even if the vm is built on a machine that does
1684 // not have dladdr1 support. Make sure there is a value for
1685 // RTLD_DL_SYMENT.
1686 #ifndef RTLD_DL_SYMENT
1687 #define RTLD_DL_SYMENT 1
1688 #endif
1689 #ifdef _LP64
1690 Elf64_Sym * info;
1691 #else
1692 Elf32_Sym * info;
1693 #endif
1694 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1695 RTLD_DL_SYMENT) != 0) {
1696 // see if we have a matching symbol that covers our address
1697 if (dlinfo.dli_saddr != NULL &&
1698 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1699 if (dlinfo.dli_sname != NULL) {
1700 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1701 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1702 }
1703 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1704 return true;
1705 }
1706 }
1707 // no matching symbol so try for just file info
1708 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1709 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1710 buf, buflen, offset, dlinfo.dli_fname)) {
1711 return true;
1712 }
1713 }
1714 }
1715 buf[0] = '\0';
1716 if (offset != NULL) *offset = -1;
1717 return false;
1718 }
1719
1720 // no, only dladdr is available
1721 if (dladdr((void *)addr, &dlinfo) != 0) {
1722 // see if we have a matching symbol
1723 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1724 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1725 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1726 }
1727 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1728 return true;
1729 }
1730 // no matching symbol so try for just file info
1731 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1732 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1733 buf, buflen, offset, dlinfo.dli_fname)) {
1734 return true;
1735 }
1736 }
1737 }
1738 buf[0] = '\0';
1739 if (offset != NULL) *offset = -1;
1740 return false;
1741 }
1742
1743 bool os::dll_address_to_library_name(address addr, char* buf,
1744 int buflen, int* offset) {
1745 // buf is not optional, but offset is optional
1746 assert(buf != NULL, "sanity check");
1747
1748 Dl_info dlinfo;
1749
1750 if (dladdr((void*)addr, &dlinfo) != 0) {
1751 if (dlinfo.dli_fname != NULL) {
1752 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1753 }
1754 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1755 *offset = addr - (address)dlinfo.dli_fbase;
1756 }
1757 return true;
1758 }
1759
1760 buf[0] = '\0';
1761 if (offset) *offset = -1;
1762 return false;
1763 }
1764
1765 // Prints the names and full paths of all opened dynamic libraries
1766 // for current process
1767 void os::print_dll_info(outputStream * st) {
1768 Dl_info dli;
1769 void *handle;
1770 Link_map *map;
1771 Link_map *p;
1772
1773 st->print_cr("Dynamic libraries:"); st->flush();
1774
1775 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1776 dli.dli_fname == NULL) {
1777 st->print_cr("Error: Cannot print dynamic libraries.");
1778 return;
1779 }
1780 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1781 if (handle == NULL) {
1782 st->print_cr("Error: Cannot print dynamic libraries.");
1783 return;
1784 }
1785 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1786 if (map == NULL) {
1787 st->print_cr("Error: Cannot print dynamic libraries.");
1788 return;
1789 }
1790
1791 while (map->l_prev != NULL)
1792 map = map->l_prev;
1793
1794 while (map != NULL) {
1795 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1796 map = map->l_next;
1797 }
1798
1799 dlclose(handle);
1800 }
1801
1802 // Loads .dll/.so and
1803 // in case of error it checks if .dll/.so was built for the
1804 // same architecture as Hotspot is running on
1805
1806 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1807 {
1808 void * result= ::dlopen(filename, RTLD_LAZY);
1809 if (result != NULL) {
1810 // Successful loading
1811 return result;
1812 }
1813
1814 Elf32_Ehdr elf_head;
1815
1816 // Read system error message into ebuf
1817 // It may or may not be overwritten below
1818 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1819 ebuf[ebuflen-1]='\0';
1820 int diag_msg_max_length=ebuflen-strlen(ebuf);
1821 char* diag_msg_buf=ebuf+strlen(ebuf);
1822
1823 if (diag_msg_max_length==0) {
1824 // No more space in ebuf for additional diagnostics message
1825 return NULL;
1826 }
1827
1828
1829 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1830
1831 if (file_descriptor < 0) {
1832 // Can't open library, report dlerror() message
1833 return NULL;
1834 }
1835
1836 bool failed_to_read_elf_head=
1837 (sizeof(elf_head)!=
1838 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
1839
1840 ::close(file_descriptor);
1841 if (failed_to_read_elf_head) {
1842 // file i/o error - report dlerror() msg
1843 return NULL;
1844 }
1845
1846 typedef struct {
1847 Elf32_Half code; // Actual value as defined in elf.h
1848 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1849 char elf_class; // 32 or 64 bit
1850 char endianess; // MSB or LSB
1851 char* name; // String representation
1852 } arch_t;
1853
1854 static const arch_t arch_array[]={
1855 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1856 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1857 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1858 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1859 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1860 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1861 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1862 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1863 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1864 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1865 };
1866
1867 #if (defined IA32)
1868 static Elf32_Half running_arch_code=EM_386;
1869 #elif (defined AMD64)
1870 static Elf32_Half running_arch_code=EM_X86_64;
1871 #elif (defined IA64)
1872 static Elf32_Half running_arch_code=EM_IA_64;
1873 #elif (defined __sparc) && (defined _LP64)
1874 static Elf32_Half running_arch_code=EM_SPARCV9;
1875 #elif (defined __sparc) && (!defined _LP64)
1876 static Elf32_Half running_arch_code=EM_SPARC;
1877 #elif (defined __powerpc64__)
1878 static Elf32_Half running_arch_code=EM_PPC64;
1879 #elif (defined __powerpc__)
1880 static Elf32_Half running_arch_code=EM_PPC;
1881 #elif (defined ARM)
1882 static Elf32_Half running_arch_code=EM_ARM;
1883 #else
1884 #error Method os::dll_load requires that one of following is defined:\
1885 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1886 #endif
1887
1888 // Identify compatability class for VM's architecture and library's architecture
1889 // Obtain string descriptions for architectures
1890
1891 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1892 int running_arch_index=-1;
1893
1894 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
1895 if (running_arch_code == arch_array[i].code) {
1896 running_arch_index = i;
1897 }
1898 if (lib_arch.code == arch_array[i].code) {
1899 lib_arch.compat_class = arch_array[i].compat_class;
1900 lib_arch.name = arch_array[i].name;
1901 }
1902 }
1903
1904 assert(running_arch_index != -1,
1905 "Didn't find running architecture code (running_arch_code) in arch_array");
1906 if (running_arch_index == -1) {
1907 // Even though running architecture detection failed
1908 // we may still continue with reporting dlerror() message
1909 return NULL;
1910 }
1911
1912 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1913 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1914 return NULL;
1915 }
1916
1917 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1918 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1919 return NULL;
1920 }
1921
1922 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1923 if ( lib_arch.name!=NULL ) {
1924 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1925 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1926 lib_arch.name, arch_array[running_arch_index].name);
1927 } else {
1928 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1929 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1930 lib_arch.code,
1931 arch_array[running_arch_index].name);
1932 }
1933 }
1934
1935 return NULL;
1936 }
1937
1938 void* os::dll_lookup(void* handle, const char* name) {
1939 return dlsym(handle, name);
1940 }
1941
1942 void* os::get_default_process_handle() {
1943 return (void*)::dlopen(NULL, RTLD_LAZY);
1944 }
1945
1946 int os::stat(const char *path, struct stat *sbuf) {
1947 char pathbuf[MAX_PATH];
1948 if (strlen(path) > MAX_PATH - 1) {
1949 errno = ENAMETOOLONG;
1950 return -1;
1951 }
1952 os::native_path(strcpy(pathbuf, path));
1953 return ::stat(pathbuf, sbuf);
1954 }
1955
1956 static bool _print_ascii_file(const char* filename, outputStream* st) {
1957 int fd = ::open(filename, O_RDONLY);
1958 if (fd == -1) {
1959 return false;
1960 }
1961
1962 char buf[32];
1963 int bytes;
1964 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1965 st->print_raw(buf, bytes);
1966 }
1967
1968 ::close(fd);
1969
1970 return true;
1971 }
1972
1973 void os::print_os_info_brief(outputStream* st) {
1974 os::Solaris::print_distro_info(st);
1975
1976 os::Posix::print_uname_info(st);
1977
1978 os::Solaris::print_libversion_info(st);
1979 }
1980
1981 void os::print_os_info(outputStream* st) {
1982 st->print("OS:");
1983
1984 os::Solaris::print_distro_info(st);
1985
1986 os::Posix::print_uname_info(st);
1987
1988 os::Solaris::print_libversion_info(st);
1989
1990 os::Posix::print_rlimit_info(st);
1991
1992 os::Posix::print_load_average(st);
1993 }
1994
1995 void os::Solaris::print_distro_info(outputStream* st) {
1996 if (!_print_ascii_file("/etc/release", st)) {
1997 st->print("Solaris");
1998 }
1999 st->cr();
2000 }
2001
2002 void os::Solaris::print_libversion_info(outputStream* st) {
2003 if (os::Solaris::T2_libthread()) {
2004 st->print(" (T2 libthread)");
2005 }
2006 else {
2007 st->print(" (T1 libthread)");
2008 }
2009 st->cr();
2010 }
2011
2012 static bool check_addr0(outputStream* st) {
2013 jboolean status = false;
2014 int fd = ::open("/proc/self/map",O_RDONLY);
2015 if (fd >= 0) {
2016 prmap_t p;
2017 while(::read(fd, &p, sizeof(p)) > 0) {
2018 if (p.pr_vaddr == 0x0) {
2019 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
2020 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
2021 st->print("Access:");
2022 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
2023 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
2024 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
2025 st->cr();
2026 status = true;
2027 }
2028 }
2029 ::close(fd);
2030 }
2031 return status;
2032 }
2033
2034 void os::pd_print_cpu_info(outputStream* st) {
2035 // Nothing to do for now.
2036 }
2037
2038 void os::print_memory_info(outputStream* st) {
2039 st->print("Memory:");
2040 st->print(" %dk page", os::vm_page_size()>>10);
2041 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2042 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2043 st->cr();
2044 if (VMError::fatal_error_in_progress()) {
2045 (void) check_addr0(st);
2046 }
2047 }
2048
2049 void os::print_siginfo(outputStream* st, void* siginfo) {
2050 const siginfo_t* si = (const siginfo_t*)siginfo;
2051
2052 os::Posix::print_siginfo_brief(st, si);
2053
2054 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2055 UseSharedSpaces) {
2056 FileMapInfo* mapinfo = FileMapInfo::current_info();
2057 if (mapinfo->is_in_shared_space(si->si_addr)) {
2058 st->print("\n\nError accessing class data sharing archive." \
2059 " Mapped file inaccessible during execution, " \
2060 " possible disk/network problem.");
2061 }
2062 }
2063 st->cr();
2064 }
2065
2066 // Moved from whole group, because we need them here for diagnostic
2067 // prints.
2068 #define OLDMAXSIGNUM 32
2069 static int Maxsignum = 0;
2070 static int *ourSigFlags = NULL;
2071
2072 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2073
2074 int os::Solaris::get_our_sigflags(int sig) {
2075 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2076 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2077 return ourSigFlags[sig];
2078 }
2079
2080 void os::Solaris::set_our_sigflags(int sig, int flags) {
2081 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2082 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2083 ourSigFlags[sig] = flags;
2084 }
2085
2086
2087 static const char* get_signal_handler_name(address handler,
2088 char* buf, int buflen) {
2089 int offset;
2090 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2091 if (found) {
2092 // skip directory names
2093 const char *p1, *p2;
2094 p1 = buf;
2095 size_t len = strlen(os::file_separator());
2096 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2097 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2098 } else {
2099 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2100 }
2101 return buf;
2102 }
2103
2104 static void print_signal_handler(outputStream* st, int sig,
2105 char* buf, size_t buflen) {
2106 struct sigaction sa;
2107
2108 sigaction(sig, NULL, &sa);
2109
2110 st->print("%s: ", os::exception_name(sig, buf, buflen));
2111
2112 address handler = (sa.sa_flags & SA_SIGINFO)
2113 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2114 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2115
2116 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2117 st->print("SIG_DFL");
2118 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2119 st->print("SIG_IGN");
2120 } else {
2121 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2122 }
2123
2124 st->print(", sa_mask[0]=");
2125 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2126
2127 address rh = VMError::get_resetted_sighandler(sig);
2128 // May be, handler was resetted by VMError?
2129 if(rh != NULL) {
2130 handler = rh;
2131 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2132 }
2133
2134 st->print(", sa_flags=");
2135 os::Posix::print_sa_flags(st, sa.sa_flags);
2136
2137 // Check: is it our handler?
2138 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2139 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2140 // It is our signal handler
2141 // check for flags
2142 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2143 st->print(
2144 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2145 os::Solaris::get_our_sigflags(sig));
2146 }
2147 }
2148 st->cr();
2149 }
2150
2151 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2152 st->print_cr("Signal Handlers:");
2153 print_signal_handler(st, SIGSEGV, buf, buflen);
2154 print_signal_handler(st, SIGBUS , buf, buflen);
2155 print_signal_handler(st, SIGFPE , buf, buflen);
2156 print_signal_handler(st, SIGPIPE, buf, buflen);
2157 print_signal_handler(st, SIGXFSZ, buf, buflen);
2158 print_signal_handler(st, SIGILL , buf, buflen);
2159 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2160 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2161 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2162 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2163 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2164 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2165 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2166 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2167 }
2168
2169 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2170
2171 // Find the full path to the current module, libjvm.so
2172 void os::jvm_path(char *buf, jint buflen) {
2173 // Error checking.
2174 if (buflen < MAXPATHLEN) {
2175 assert(false, "must use a large-enough buffer");
2176 buf[0] = '\0';
2177 return;
2178 }
2179 // Lazy resolve the path to current module.
2180 if (saved_jvm_path[0] != 0) {
2181 strcpy(buf, saved_jvm_path);
2182 return;
2183 }
2184
2185 Dl_info dlinfo;
2186 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2187 assert(ret != 0, "cannot locate libjvm");
2188 if (ret != 0 && dlinfo.dli_fname != NULL) {
2189 realpath((char *)dlinfo.dli_fname, buf);
2190 } else {
2191 buf[0] = '\0';
2192 return;
2193 }
2194
2195 if (Arguments::created_by_gamma_launcher()) {
2196 // Support for the gamma launcher. Typical value for buf is
2197 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2198 // the right place in the string, then assume we are installed in a JDK and
2199 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2200 // up the path so it looks like libjvm.so is installed there (append a
2201 // fake suffix hotspot/libjvm.so).
2202 const char *p = buf + strlen(buf) - 1;
2203 for (int count = 0; p > buf && count < 5; ++count) {
2204 for (--p; p > buf && *p != '/'; --p)
2205 /* empty */ ;
2206 }
2207
2208 if (strncmp(p, "/jre/lib/", 9) != 0) {
2209 // Look for JAVA_HOME in the environment.
2210 char* java_home_var = ::getenv("JAVA_HOME");
2211 if (java_home_var != NULL && java_home_var[0] != 0) {
2212 char cpu_arch[12];
2213 char* jrelib_p;
2214 int len;
2215 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2216 #ifdef _LP64
2217 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2218 if (strcmp(cpu_arch, "sparc") == 0) {
2219 strcat(cpu_arch, "v9");
2220 } else if (strcmp(cpu_arch, "i386") == 0) {
2221 strcpy(cpu_arch, "amd64");
2222 }
2223 #endif
2224 // Check the current module name "libjvm.so".
2225 p = strrchr(buf, '/');
2226 assert(strstr(p, "/libjvm") == p, "invalid library name");
2227
2228 realpath(java_home_var, buf);
2229 // determine if this is a legacy image or modules image
2230 // modules image doesn't have "jre" subdirectory
2231 len = strlen(buf);
2232 assert(len < buflen, "Ran out of buffer space");
2233 jrelib_p = buf + len;
2234 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2235 if (0 != access(buf, F_OK)) {
2236 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2237 }
2238
2239 if (0 == access(buf, F_OK)) {
2240 // Use current module name "libjvm.so"
2241 len = strlen(buf);
2242 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2243 } else {
2244 // Go back to path of .so
2245 realpath((char *)dlinfo.dli_fname, buf);
2246 }
2247 }
2248 }
2249 }
2250
2251 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2252 }
2253
2254
2255 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2256 // no prefix required, not even "_"
2257 }
2258
2259
2260 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2261 // no suffix required
2262 }
2263
2264 // This method is a copy of JDK's sysGetLastErrorString
2265 // from src/solaris/hpi/src/system_md.c
2266
2267 size_t os::lasterror(char *buf, size_t len) {
2268
2269 if (errno == 0) return 0;
2270
2271 const char *s = ::strerror(errno);
2272 size_t n = ::strlen(s);
2273 if (n >= len) {
2274 n = len - 1;
2275 }
2276 ::strncpy(buf, s, n);
2277 buf[n] = '\0';
2278 return n;
2279 }
2280
2281
2282 // sun.misc.Signal
2283
2284 extern "C" {
2285 static void UserHandler(int sig, void *siginfo, void *context) {
2286 // Ctrl-C is pressed during error reporting, likely because the error
2287 // handler fails to abort. Let VM die immediately.
2288 if (sig == SIGINT && is_error_reported()) {
2289 os::die();
2290 }
2291
2292 os::signal_notify(sig);
2293 // We do not need to reinstate the signal handler each time...
2294 }
2295 }
2296
2297 void* os::user_handler() {
2298 return CAST_FROM_FN_PTR(void*, UserHandler);
2299 }
2300
2301 class Semaphore : public StackObj {
2302 public:
2303 Semaphore();
2304 ~Semaphore();
2305 void signal();
2306 void wait();
2307 bool trywait();
2308 bool timedwait(unsigned int sec, int nsec);
2309 private:
2310 sema_t _semaphore;
2311 };
2312
2313
2314 Semaphore::Semaphore() {
2315 sema_init(&_semaphore, 0, NULL, NULL);
2316 }
2317
2318 Semaphore::~Semaphore() {
2319 sema_destroy(&_semaphore);
2320 }
2321
2322 void Semaphore::signal() {
2323 sema_post(&_semaphore);
2324 }
2325
2326 void Semaphore::wait() {
2327 sema_wait(&_semaphore);
2328 }
2329
2330 bool Semaphore::trywait() {
2331 return sema_trywait(&_semaphore) == 0;
2332 }
2333
2334 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2335 struct timespec ts;
2336 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2337
2338 while (1) {
2339 int result = sema_timedwait(&_semaphore, &ts);
2340 if (result == 0) {
2341 return true;
2342 } else if (errno == EINTR) {
2343 continue;
2344 } else if (errno == ETIME) {
2345 return false;
2346 } else {
2347 return false;
2348 }
2349 }
2350 }
2351
2352 extern "C" {
2353 typedef void (*sa_handler_t)(int);
2354 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2355 }
2356
2357 void* os::signal(int signal_number, void* handler) {
2358 struct sigaction sigAct, oldSigAct;
2359 sigfillset(&(sigAct.sa_mask));
2360 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2361 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2362
2363 if (sigaction(signal_number, &sigAct, &oldSigAct))
2364 // -1 means registration failed
2365 return (void *)-1;
2366
2367 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2368 }
2369
2370 void os::signal_raise(int signal_number) {
2371 raise(signal_number);
2372 }
2373
2374 /*
2375 * The following code is moved from os.cpp for making this
2376 * code platform specific, which it is by its very nature.
2377 */
2378
2379 // a counter for each possible signal value
2380 static int Sigexit = 0;
2381 static int Maxlibjsigsigs;
2382 static jint *pending_signals = NULL;
2383 static int *preinstalled_sigs = NULL;
2384 static struct sigaction *chainedsigactions = NULL;
2385 static sema_t sig_sem;
2386 typedef int (*version_getting_t)();
2387 version_getting_t os::Solaris::get_libjsig_version = NULL;
2388 static int libjsigversion = NULL;
2389
2390 int os::sigexitnum_pd() {
2391 assert(Sigexit > 0, "signal memory not yet initialized");
2392 return Sigexit;
2393 }
2394
2395 void os::Solaris::init_signal_mem() {
2396 // Initialize signal structures
2397 Maxsignum = SIGRTMAX;
2398 Sigexit = Maxsignum+1;
2399 assert(Maxsignum >0, "Unable to obtain max signal number");
2400
2401 Maxlibjsigsigs = Maxsignum;
2402
2403 // pending_signals has one int per signal
2404 // The additional signal is for SIGEXIT - exit signal to signal_thread
2405 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2406 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2407
2408 if (UseSignalChaining) {
2409 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2410 * (Maxsignum + 1), mtInternal);
2411 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2412 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2413 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2414 }
2415 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2416 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2417 }
2418
2419 void os::signal_init_pd() {
2420 int ret;
2421
2422 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2423 assert(ret == 0, "sema_init() failed");
2424 }
2425
2426 void os::signal_notify(int signal_number) {
2427 int ret;
2428
2429 Atomic::inc(&pending_signals[signal_number]);
2430 ret = ::sema_post(&sig_sem);
2431 assert(ret == 0, "sema_post() failed");
2432 }
2433
2434 static int check_pending_signals(bool wait_for_signal) {
2435 int ret;
2436 while (true) {
2437 for (int i = 0; i < Sigexit + 1; i++) {
2438 jint n = pending_signals[i];
2439 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2440 return i;
2441 }
2442 }
2443 if (!wait_for_signal) {
2444 return -1;
2445 }
2446 JavaThread *thread = JavaThread::current();
2447 ThreadBlockInVM tbivm(thread);
2448
2449 bool threadIsSuspended;
2450 do {
2451 thread->set_suspend_equivalent();
2452 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2453 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2454 ;
2455 assert(ret == 0, "sema_wait() failed");
2456
2457 // were we externally suspended while we were waiting?
2458 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2459 if (threadIsSuspended) {
2460 //
2461 // The semaphore has been incremented, but while we were waiting
2462 // another thread suspended us. We don't want to continue running
2463 // while suspended because that would surprise the thread that
2464 // suspended us.
2465 //
2466 ret = ::sema_post(&sig_sem);
2467 assert(ret == 0, "sema_post() failed");
2468
2469 thread->java_suspend_self();
2470 }
2471 } while (threadIsSuspended);
2472 }
2473 }
2474
2475 int os::signal_lookup() {
2476 return check_pending_signals(false);
2477 }
2478
2479 int os::signal_wait() {
2480 return check_pending_signals(true);
2481 }
2482
2483 ////////////////////////////////////////////////////////////////////////////////
2484 // Virtual Memory
2485
2486 static int page_size = -1;
2487
2488 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2489 // clear this var if support is not available.
2490 static bool has_map_align = true;
2491
2492 int os::vm_page_size() {
2493 assert(page_size != -1, "must call os::init");
2494 return page_size;
2495 }
2496
2497 // Solaris allocates memory by pages.
2498 int os::vm_allocation_granularity() {
2499 assert(page_size != -1, "must call os::init");
2500 return page_size;
2501 }
2502
2503 static bool recoverable_mmap_error(int err) {
2504 // See if the error is one we can let the caller handle. This
2505 // list of errno values comes from the Solaris mmap(2) man page.
2506 switch (err) {
2507 case EBADF:
2508 case EINVAL:
2509 case ENOTSUP:
2510 // let the caller deal with these errors
2511 return true;
2512
2513 default:
2514 // Any remaining errors on this OS can cause our reserved mapping
2515 // to be lost. That can cause confusion where different data
2516 // structures think they have the same memory mapped. The worst
2517 // scenario is if both the VM and a library think they have the
2518 // same memory mapped.
2519 return false;
2520 }
2521 }
2522
2523 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2524 int err) {
2525 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2526 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2527 strerror(err), err);
2528 }
2529
2530 static void warn_fail_commit_memory(char* addr, size_t bytes,
2531 size_t alignment_hint, bool exec,
2532 int err) {
2533 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2534 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2535 alignment_hint, exec, strerror(err), err);
2536 }
2537
2538 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2539 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2540 size_t size = bytes;
2541 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2542 if (res != NULL) {
2543 if (UseNUMAInterleaving) {
2544 numa_make_global(addr, bytes);
2545 }
2546 return 0;
2547 }
2548
2549 int err = errno; // save errno from mmap() call in mmap_chunk()
2550
2551 if (!recoverable_mmap_error(err)) {
2552 warn_fail_commit_memory(addr, bytes, exec, err);
2553 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2554 }
2555
2556 return err;
2557 }
2558
2559 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2560 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2561 }
2562
2563 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2564 const char* mesg) {
2565 assert(mesg != NULL, "mesg must be specified");
2566 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2567 if (err != 0) {
2568 // the caller wants all commit errors to exit with the specified mesg:
2569 warn_fail_commit_memory(addr, bytes, exec, err);
2570 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2571 }
2572 }
2573
2574 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2575 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2576 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2577 alignment, (size_t) vm_page_size()));
2578
2579 for (int i = 0; _page_sizes[i] != 0; i++) {
2580 if (is_size_aligned(alignment, _page_sizes[i])) {
2581 return _page_sizes[i];
2582 }
2583 }
2584
2585 return (size_t) vm_page_size();
2586 }
2587
2588 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2589 size_t alignment_hint, bool exec) {
2590 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2591 if (err == 0 && UseLargePages && alignment_hint > 0) {
2592 assert(is_size_aligned(bytes, alignment_hint),
2593 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint));
2594
2595 // The syscall memcntl requires an exact page size (see man memcntl for details).
2596 size_t page_size = page_size_for_alignment(alignment_hint);
2597 if (page_size > (size_t) vm_page_size()) {
2598 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2599 }
2600 }
2601 return err;
2602 }
2603
2604 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2605 bool exec) {
2606 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2607 }
2608
2609 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2610 size_t alignment_hint, bool exec,
2611 const char* mesg) {
2612 assert(mesg != NULL, "mesg must be specified");
2613 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2614 if (err != 0) {
2615 // the caller wants all commit errors to exit with the specified mesg:
2616 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2617 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2618 }
2619 }
2620
2621 // Uncommit the pages in a specified region.
2622 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2623 if (madvise(addr, bytes, MADV_FREE) < 0) {
2624 debug_only(warning("MADV_FREE failed."));
2625 return;
2626 }
2627 }
2628
2629 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2630 return os::commit_memory(addr, size, !ExecMem);
2631 }
2632
2633 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2634 return os::uncommit_memory(addr, size);
2635 }
2636
2637 // Change the page size in a given range.
2638 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2639 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2640 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2641 if (UseLargePages) {
2642 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2643 }
2644 }
2645
2646 // Tell the OS to make the range local to the first-touching LWP
2647 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2648 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2649 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2650 debug_only(warning("MADV_ACCESS_LWP failed."));
2651 }
2652 }
2653
2654 // Tell the OS that this range would be accessed from different LWPs.
2655 void os::numa_make_global(char *addr, size_t bytes) {
2656 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2657 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2658 debug_only(warning("MADV_ACCESS_MANY failed."));
2659 }
2660 }
2661
2662 // Get the number of the locality groups.
2663 size_t os::numa_get_groups_num() {
2664 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2665 return n != -1 ? n : 1;
2666 }
2667
2668 // Get a list of leaf locality groups. A leaf lgroup is group that
2669 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2670 // board. An LWP is assigned to one of these groups upon creation.
2671 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2672 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2673 ids[0] = 0;
2674 return 1;
2675 }
2676 int result_size = 0, top = 1, bottom = 0, cur = 0;
2677 for (int k = 0; k < size; k++) {
2678 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2679 (Solaris::lgrp_id_t*)&ids[top], size - top);
2680 if (r == -1) {
2681 ids[0] = 0;
2682 return 1;
2683 }
2684 if (!r) {
2685 // That's a leaf node.
2686 assert (bottom <= cur, "Sanity check");
2687 // Check if the node has memory
2688 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2689 NULL, 0, LGRP_RSRC_MEM) > 0) {
2690 ids[bottom++] = ids[cur];
2691 }
2692 }
2693 top += r;
2694 cur++;
2695 }
2696 if (bottom == 0) {
2697 // Handle a situation, when the OS reports no memory available.
2698 // Assume UMA architecture.
2699 ids[0] = 0;
2700 return 1;
2701 }
2702 return bottom;
2703 }
2704
2705 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2706 bool os::numa_topology_changed() {
2707 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2708 if (is_stale != -1 && is_stale) {
2709 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2710 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2711 assert(c != 0, "Failure to initialize LGRP API");
2712 Solaris::set_lgrp_cookie(c);
2713 return true;
2714 }
2715 return false;
2716 }
2717
2718 // Get the group id of the current LWP.
2719 int os::numa_get_group_id() {
2720 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2721 if (lgrp_id == -1) {
2722 return 0;
2723 }
2724 const int size = os::numa_get_groups_num();
2725 int *ids = (int*)alloca(size * sizeof(int));
2726
2727 // Get the ids of all lgroups with memory; r is the count.
2728 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2729 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2730 if (r <= 0) {
2731 return 0;
2732 }
2733 return ids[os::random() % r];
2734 }
2735
2736 // Request information about the page.
2737 bool os::get_page_info(char *start, page_info* info) {
2738 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2739 uint64_t addr = (uintptr_t)start;
2740 uint64_t outdata[2];
2741 uint_t validity = 0;
2742
2743 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2744 return false;
2745 }
2746
2747 info->size = 0;
2748 info->lgrp_id = -1;
2749
2750 if ((validity & 1) != 0) {
2751 if ((validity & 2) != 0) {
2752 info->lgrp_id = outdata[0];
2753 }
2754 if ((validity & 4) != 0) {
2755 info->size = outdata[1];
2756 }
2757 return true;
2758 }
2759 return false;
2760 }
2761
2762 // Scan the pages from start to end until a page different than
2763 // the one described in the info parameter is encountered.
2764 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2765 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2766 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2767 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2768 uint_t validity[MAX_MEMINFO_CNT];
2769
2770 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2771 uint64_t p = (uint64_t)start;
2772 while (p < (uint64_t)end) {
2773 addrs[0] = p;
2774 size_t addrs_count = 1;
2775 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2776 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2777 addrs_count++;
2778 }
2779
2780 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2781 return NULL;
2782 }
2783
2784 size_t i = 0;
2785 for (; i < addrs_count; i++) {
2786 if ((validity[i] & 1) != 0) {
2787 if ((validity[i] & 4) != 0) {
2788 if (outdata[types * i + 1] != page_expected->size) {
2789 break;
2790 }
2791 } else
2792 if (page_expected->size != 0) {
2793 break;
2794 }
2795
2796 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2797 if (outdata[types * i] != page_expected->lgrp_id) {
2798 break;
2799 }
2800 }
2801 } else {
2802 return NULL;
2803 }
2804 }
2805
2806 if (i < addrs_count) {
2807 if ((validity[i] & 2) != 0) {
2808 page_found->lgrp_id = outdata[types * i];
2809 } else {
2810 page_found->lgrp_id = -1;
2811 }
2812 if ((validity[i] & 4) != 0) {
2813 page_found->size = outdata[types * i + 1];
2814 } else {
2815 page_found->size = 0;
2816 }
2817 return (char*)addrs[i];
2818 }
2819
2820 p = addrs[addrs_count - 1] + page_size;
2821 }
2822 return end;
2823 }
2824
2825 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2826 size_t size = bytes;
2827 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2828 // uncommitted page. Otherwise, the read/write might succeed if we
2829 // have enough swap space to back the physical page.
2830 return
2831 NULL != Solaris::mmap_chunk(addr, size,
2832 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2833 PROT_NONE);
2834 }
2835
2836 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2837 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2838
2839 if (b == MAP_FAILED) {
2840 return NULL;
2841 }
2842 return b;
2843 }
2844
2845 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2846 char* addr = requested_addr;
2847 int flags = MAP_PRIVATE | MAP_NORESERVE;
2848
2849 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2850
2851 if (fixed) {
2852 flags |= MAP_FIXED;
2853 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2854 flags |= MAP_ALIGN;
2855 addr = (char*) alignment_hint;
2856 }
2857
2858 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2859 // uncommitted page. Otherwise, the read/write might succeed if we
2860 // have enough swap space to back the physical page.
2861 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2862 }
2863
2864 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2865 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2866
2867 guarantee(requested_addr == NULL || requested_addr == addr,
2868 "OS failed to return requested mmap address.");
2869 return addr;
2870 }
2871
2872 // Reserve memory at an arbitrary address, only if that area is
2873 // available (and not reserved for something else).
2874
2875 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2876 const int max_tries = 10;
2877 char* base[max_tries];
2878 size_t size[max_tries];
2879
2880 // Solaris adds a gap between mmap'ed regions. The size of the gap
2881 // is dependent on the requested size and the MMU. Our initial gap
2882 // value here is just a guess and will be corrected later.
2883 bool had_top_overlap = false;
2884 bool have_adjusted_gap = false;
2885 size_t gap = 0x400000;
2886
2887 // Assert only that the size is a multiple of the page size, since
2888 // that's all that mmap requires, and since that's all we really know
2889 // about at this low abstraction level. If we need higher alignment,
2890 // we can either pass an alignment to this method or verify alignment
2891 // in one of the methods further up the call chain. See bug 5044738.
2892 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2893
2894 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2895 // Give it a try, if the kernel honors the hint we can return immediately.
2896 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2897
2898 volatile int err = errno;
2899 if (addr == requested_addr) {
2900 return addr;
2901 } else if (addr != NULL) {
2902 pd_unmap_memory(addr, bytes);
2903 }
2904
2905 if (PrintMiscellaneous && Verbose) {
2906 char buf[256];
2907 buf[0] = '\0';
2908 if (addr == NULL) {
2909 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2910 }
2911 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2912 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2913 "%s", bytes, requested_addr, addr, buf);
2914 }
2915
2916 // Address hint method didn't work. Fall back to the old method.
2917 // In theory, once SNV becomes our oldest supported platform, this
2918 // code will no longer be needed.
2919 //
2920 // Repeatedly allocate blocks until the block is allocated at the
2921 // right spot. Give up after max_tries.
2922 int i;
2923 for (i = 0; i < max_tries; ++i) {
2924 base[i] = reserve_memory(bytes);
2925
2926 if (base[i] != NULL) {
2927 // Is this the block we wanted?
2928 if (base[i] == requested_addr) {
2929 size[i] = bytes;
2930 break;
2931 }
2932
2933 // check that the gap value is right
2934 if (had_top_overlap && !have_adjusted_gap) {
2935 size_t actual_gap = base[i-1] - base[i] - bytes;
2936 if (gap != actual_gap) {
2937 // adjust the gap value and retry the last 2 allocations
2938 assert(i > 0, "gap adjustment code problem");
2939 have_adjusted_gap = true; // adjust the gap only once, just in case
2940 gap = actual_gap;
2941 if (PrintMiscellaneous && Verbose) {
2942 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2943 }
2944 unmap_memory(base[i], bytes);
2945 unmap_memory(base[i-1], size[i-1]);
2946 i-=2;
2947 continue;
2948 }
2949 }
2950
2951 // Does this overlap the block we wanted? Give back the overlapped
2952 // parts and try again.
2953 //
2954 // There is still a bug in this code: if top_overlap == bytes,
2955 // the overlap is offset from requested region by the value of gap.
2956 // In this case giving back the overlapped part will not work,
2957 // because we'll give back the entire block at base[i] and
2958 // therefore the subsequent allocation will not generate a new gap.
2959 // This could be fixed with a new algorithm that used larger
2960 // or variable size chunks to find the requested region -
2961 // but such a change would introduce additional complications.
2962 // It's rare enough that the planets align for this bug,
2963 // so we'll just wait for a fix for 6204603/5003415 which
2964 // will provide a mmap flag to allow us to avoid this business.
2965
2966 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2967 if (top_overlap >= 0 && top_overlap < bytes) {
2968 had_top_overlap = true;
2969 unmap_memory(base[i], top_overlap);
2970 base[i] += top_overlap;
2971 size[i] = bytes - top_overlap;
2972 } else {
2973 size_t bottom_overlap = base[i] + bytes - requested_addr;
2974 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2975 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2976 warning("attempt_reserve_memory_at: possible alignment bug");
2977 }
2978 unmap_memory(requested_addr, bottom_overlap);
2979 size[i] = bytes - bottom_overlap;
2980 } else {
2981 size[i] = bytes;
2982 }
2983 }
2984 }
2985 }
2986
2987 // Give back the unused reserved pieces.
2988
2989 for (int j = 0; j < i; ++j) {
2990 if (base[j] != NULL) {
2991 unmap_memory(base[j], size[j]);
2992 }
2993 }
2994
2995 return (i < max_tries) ? requested_addr : NULL;
2996 }
2997
2998 bool os::pd_release_memory(char* addr, size_t bytes) {
2999 size_t size = bytes;
3000 return munmap(addr, size) == 0;
3001 }
3002
3003 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3004 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3005 "addr must be page aligned");
3006 int retVal = mprotect(addr, bytes, prot);
3007 return retVal == 0;
3008 }
3009
3010 // Protect memory (Used to pass readonly pages through
3011 // JNI GetArray<type>Elements with empty arrays.)
3012 // Also, used for serialization page and for compressed oops null pointer
3013 // checking.
3014 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3015 bool is_committed) {
3016 unsigned int p = 0;
3017 switch (prot) {
3018 case MEM_PROT_NONE: p = PROT_NONE; break;
3019 case MEM_PROT_READ: p = PROT_READ; break;
3020 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3021 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3022 default:
3023 ShouldNotReachHere();
3024 }
3025 // is_committed is unused.
3026 return solaris_mprotect(addr, bytes, p);
3027 }
3028
3029 // guard_memory and unguard_memory only happens within stack guard pages.
3030 // Since ISM pertains only to the heap, guard and unguard memory should not
3031 /// happen with an ISM region.
3032 bool os::guard_memory(char* addr, size_t bytes) {
3033 return solaris_mprotect(addr, bytes, PROT_NONE);
3034 }
3035
3036 bool os::unguard_memory(char* addr, size_t bytes) {
3037 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3038 }
3039
3040 // Large page support
3041 static size_t _large_page_size = 0;
3042
3043 // Insertion sort for small arrays (descending order).
3044 static void insertion_sort_descending(size_t* array, int len) {
3045 for (int i = 0; i < len; i++) {
3046 size_t val = array[i];
3047 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3048 size_t tmp = array[key];
3049 array[key] = array[key - 1];
3050 array[key - 1] = tmp;
3051 }
3052 }
3053 }
3054
3055 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3056 const unsigned int usable_count = VM_Version::page_size_count();
3057 if (usable_count == 1) {
3058 return false;
3059 }
3060
3061 // Find the right getpagesizes interface. When solaris 11 is the minimum
3062 // build platform, getpagesizes() (without the '2') can be called directly.
3063 typedef int (*gps_t)(size_t[], int);
3064 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3065 if (gps_func == NULL) {
3066 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3067 if (gps_func == NULL) {
3068 if (warn) {
3069 warning("MPSS is not supported by the operating system.");
3070 }
3071 return false;
3072 }
3073 }
3074
3075 // Fill the array of page sizes.
3076 int n = (*gps_func)(_page_sizes, page_sizes_max);
3077 assert(n > 0, "Solaris bug?");
3078
3079 if (n == page_sizes_max) {
3080 // Add a sentinel value (necessary only if the array was completely filled
3081 // since it is static (zeroed at initialization)).
3082 _page_sizes[--n] = 0;
3083 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3084 }
3085 assert(_page_sizes[n] == 0, "missing sentinel");
3086 trace_page_sizes("available page sizes", _page_sizes, n);
3087
3088 if (n == 1) return false; // Only one page size available.
3089
3090 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3091 // select up to usable_count elements. First sort the array, find the first
3092 // acceptable value, then copy the usable sizes to the top of the array and
3093 // trim the rest. Make sure to include the default page size :-).
3094 //
3095 // A better policy could get rid of the 4M limit by taking the sizes of the
3096 // important VM memory regions (java heap and possibly the code cache) into
3097 // account.
3098 insertion_sort_descending(_page_sizes, n);
3099 const size_t size_limit =
3100 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3101 int beg;
3102 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3103 const int end = MIN2((int)usable_count, n) - 1;
3104 for (int cur = 0; cur < end; ++cur, ++beg) {
3105 _page_sizes[cur] = _page_sizes[beg];
3106 }
3107 _page_sizes[end] = vm_page_size();
3108 _page_sizes[end + 1] = 0;
3109
3110 if (_page_sizes[end] > _page_sizes[end - 1]) {
3111 // Default page size is not the smallest; sort again.
3112 insertion_sort_descending(_page_sizes, end + 1);
3113 }
3114 *page_size = _page_sizes[0];
3115
3116 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3117 return true;
3118 }
3119
3120 void os::large_page_init() {
3121 if (UseLargePages) {
3122 // print a warning if any large page related flag is specified on command line
3123 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3124 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3125
3126 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3127 }
3128 }
3129
3130 bool os::Solaris::is_valid_page_size(size_t bytes) {
3131 for (int i = 0; _page_sizes[i] != 0; i++) {
3132 if (_page_sizes[i] == bytes) {
3133 return true;
3134 }
3135 }
3136 return false;
3137 }
3138
3139 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3140 assert(is_valid_page_size(align), err_msg(SIZE_FORMAT " is not a valid page size", align));
3141 assert(is_ptr_aligned((void*) start, align),
3142 err_msg(PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align));
3143 assert(is_size_aligned(bytes, align),
3144 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align));
3145
3146 // Signal to OS that we want large pages for addresses
3147 // from addr, addr + bytes
3148 struct memcntl_mha mpss_struct;
3149 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3150 mpss_struct.mha_pagesize = align;
3151 mpss_struct.mha_flags = 0;
3152 // Upon successful completion, memcntl() returns 0
3153 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3154 debug_only(warning("Attempt to use MPSS failed."));
3155 return false;
3156 }
3157 return true;
3158 }
3159
3160 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3161 fatal("os::reserve_memory_special should not be called on Solaris.");
3162 return NULL;
3163 }
3164
3165 bool os::release_memory_special(char* base, size_t bytes) {
3166 fatal("os::release_memory_special should not be called on Solaris.");
3167 return false;
3168 }
3169
3170 size_t os::large_page_size() {
3171 return _large_page_size;
3172 }
3173
3174 // MPSS allows application to commit large page memory on demand; with ISM
3175 // the entire memory region must be allocated as shared memory.
3176 bool os::can_commit_large_page_memory() {
3177 return true;
3178 }
3179
3180 bool os::can_execute_large_page_memory() {
3181 return true;
3182 }
3183
3184 static int os_sleep(jlong millis, bool interruptible) {
3185 const jlong limit = INT_MAX;
3186 jlong prevtime;
3187 int res;
3188
3189 while (millis > limit) {
3190 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3191 return res;
3192 millis -= limit;
3193 }
3194
3195 // Restart interrupted polls with new parameters until the proper delay
3196 // has been completed.
3197
3198 prevtime = getTimeMillis();
3199
3200 while (millis > 0) {
3201 jlong newtime;
3202
3203 if (!interruptible) {
3204 // Following assert fails for os::yield_all:
3205 // assert(!thread->is_Java_thread(), "must not be java thread");
3206 res = poll(NULL, 0, millis);
3207 } else {
3208 JavaThread *jt = JavaThread::current();
3209
3210 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3211 os::Solaris::clear_interrupted);
3212 }
3213
3214 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3215 // thread.Interrupt.
3216
3217 // See c/r 6751923. Poll can return 0 before time
3218 // has elapsed if time is set via clock_settime (as NTP does).
3219 // res == 0 if poll timed out (see man poll RETURN VALUES)
3220 // using the logic below checks that we really did
3221 // sleep at least "millis" if not we'll sleep again.
3222 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3223 newtime = getTimeMillis();
3224 assert(newtime >= prevtime, "time moving backwards");
3225 /* Doing prevtime and newtime in microseconds doesn't help precision,
3226 and trying to round up to avoid lost milliseconds can result in a
3227 too-short delay. */
3228 millis -= newtime - prevtime;
3229 if(millis <= 0)
3230 return OS_OK;
3231 prevtime = newtime;
3232 } else
3233 return res;
3234 }
3235
3236 return OS_OK;
3237 }
3238
3239 // Read calls from inside the vm need to perform state transitions
3240 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3241 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3242 }
3243
3244 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3245 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3246 }
3247
3248 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3249 assert(thread == Thread::current(), "thread consistency check");
3250
3251 // TODO-FIXME: this should be removed.
3252 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3253 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3254 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3255 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3256 // is fooled into believing that the system is making progress. In the code below we block the
3257 // the watcher thread while safepoint is in progress so that it would not appear as though the
3258 // system is making progress.
3259 if (!Solaris::T2_libthread() &&
3260 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3261 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3262 // the entire safepoint, the watcher thread will line up here during the safepoint.
3263 Threads_lock->lock_without_safepoint_check();
3264 Threads_lock->unlock();
3265 }
3266
3267 if (thread->is_Java_thread()) {
3268 // This is a JavaThread so we honor the _thread_blocked protocol
3269 // even for sleeps of 0 milliseconds. This was originally done
3270 // as a workaround for bug 4338139. However, now we also do it
3271 // to honor the suspend-equivalent protocol.
3272
3273 JavaThread *jt = (JavaThread *) thread;
3274 ThreadBlockInVM tbivm(jt);
3275
3276 jt->set_suspend_equivalent();
3277 // cleared by handle_special_suspend_equivalent_condition() or
3278 // java_suspend_self() via check_and_wait_while_suspended()
3279
3280 int ret_code;
3281 if (millis <= 0) {
3282 thr_yield();
3283 ret_code = 0;
3284 } else {
3285 // The original sleep() implementation did not create an
3286 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3287 // I'm preserving that decision for now.
3288 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3289
3290 ret_code = os_sleep(millis, interruptible);
3291 }
3292
3293 // were we externally suspended while we were waiting?
3294 jt->check_and_wait_while_suspended();
3295
3296 return ret_code;
3297 }
3298
3299 // non-JavaThread from this point on:
3300
3301 if (millis <= 0) {
3302 thr_yield();
3303 return 0;
3304 }
3305
3306 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3307
3308 return os_sleep(millis, interruptible);
3309 }
3310
3311 void os::naked_short_sleep(jlong ms) {
3312 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3313
3314 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3315 // Solaris requires -lrt for this.
3316 usleep((ms * 1000));
3317
3318 return;
3319 }
3320
3321 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3322 void os::infinite_sleep() {
3323 while (true) { // sleep forever ...
3324 ::sleep(100); // ... 100 seconds at a time
3325 }
3326 }
3327
3328 // Used to convert frequent JVM_Yield() to nops
3329 bool os::dont_yield() {
3330 if (DontYieldALot) {
3331 static hrtime_t last_time = 0;
3332 hrtime_t diff = getTimeNanos() - last_time;
3333
3334 if (diff < DontYieldALotInterval * 1000000)
3335 return true;
3336
3337 last_time += diff;
3338
3339 return false;
3340 }
3341 else {
3342 return false;
3343 }
3344 }
3345
3346 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3347 // the linux and win32 implementations do not. This should be checked.
3348
3349 void os::yield() {
3350 // Yields to all threads with same or greater priority
3351 os::sleep(Thread::current(), 0, false);
3352 }
3353
3354 // Note that yield semantics are defined by the scheduling class to which
3355 // the thread currently belongs. Typically, yield will _not yield to
3356 // other equal or higher priority threads that reside on the dispatch queues
3357 // of other CPUs.
3358
3359 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3360
3361
3362 // On Solaris we found that yield_all doesn't always yield to all other threads.
3363 // There have been cases where there is a thread ready to execute but it doesn't
3364 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3365 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3366 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3367 // number of times yield_all is called in the one loop and increase the sleep
3368 // time after 8 attempts. If this fails too we increase the concurrency level
3369 // so that the starving thread would get an lwp
3370
3371 void os::yield_all(int attempts) {
3372 // Yields to all threads, including threads with lower priorities
3373 if (attempts == 0) {
3374 os::sleep(Thread::current(), 1, false);
3375 } else {
3376 int iterations = attempts % 30;
3377 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3378 // thr_setconcurrency and _getconcurrency make sense only under T1.
3379 int noofLWPS = thr_getconcurrency();
3380 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3381 thr_setconcurrency(thr_getconcurrency() + 1);
3382 }
3383 } else if (iterations < 25) {
3384 os::sleep(Thread::current(), 1, false);
3385 } else {
3386 os::sleep(Thread::current(), 10, false);
3387 }
3388 }
3389 }
3390
3391 // Called from the tight loops to possibly influence time-sharing heuristics
3392 void os::loop_breaker(int attempts) {
3393 os::yield_all(attempts);
3394 }
3395
3396
3397 // Interface for setting lwp priorities. If we are using T2 libthread,
3398 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3399 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3400 // function is meaningless in this mode so we must adjust the real lwp's priority
3401 // The routines below implement the getting and setting of lwp priorities.
3402 //
3403 // Note: There are three priority scales used on Solaris. Java priotities
3404 // which range from 1 to 10, libthread "thr_setprio" scale which range
3405 // from 0 to 127, and the current scheduling class of the process we
3406 // are running in. This is typically from -60 to +60.
3407 // The setting of the lwp priorities in done after a call to thr_setprio
3408 // so Java priorities are mapped to libthread priorities and we map from
3409 // the latter to lwp priorities. We don't keep priorities stored in
3410 // Java priorities since some of our worker threads want to set priorities
3411 // higher than all Java threads.
3412 //
3413 // For related information:
3414 // (1) man -s 2 priocntl
3415 // (2) man -s 4 priocntl
3416 // (3) man dispadmin
3417 // = librt.so
3418 // = libthread/common/rtsched.c - thrp_setlwpprio().
3419 // = ps -cL <pid> ... to validate priority.
3420 // = sched_get_priority_min and _max
3421 // pthread_create
3422 // sched_setparam
3423 // pthread_setschedparam
3424 //
3425 // Assumptions:
3426 // + We assume that all threads in the process belong to the same
3427 // scheduling class. IE. an homogenous process.
3428 // + Must be root or in IA group to change change "interactive" attribute.
3429 // Priocntl() will fail silently. The only indication of failure is when
3430 // we read-back the value and notice that it hasn't changed.
3431 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3432 // + For RT, change timeslice as well. Invariant:
3433 // constant "priority integral"
3434 // Konst == TimeSlice * (60-Priority)
3435 // Given a priority, compute appropriate timeslice.
3436 // + Higher numerical values have higher priority.
3437
3438 // sched class attributes
3439 typedef struct {
3440 int schedPolicy; // classID
3441 int maxPrio;
3442 int minPrio;
3443 } SchedInfo;
3444
3445
3446 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3447
3448 #ifdef ASSERT
3449 static int ReadBackValidate = 1;
3450 #endif
3451 static int myClass = 0;
3452 static int myMin = 0;
3453 static int myMax = 0;
3454 static int myCur = 0;
3455 static bool priocntl_enable = false;
3456
3457 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3458 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3459
3460
3461 // lwp_priocntl_init
3462 //
3463 // Try to determine the priority scale for our process.
3464 //
3465 // Return errno or 0 if OK.
3466 //
3467 static int lwp_priocntl_init () {
3468 int rslt;
3469 pcinfo_t ClassInfo;
3470 pcparms_t ParmInfo;
3471 int i;
3472
3473 if (!UseThreadPriorities) return 0;
3474
3475 // We are using Bound threads, we need to determine our priority ranges
3476 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3477 // If ThreadPriorityPolicy is 1, switch tables
3478 if (ThreadPriorityPolicy == 1) {
3479 for (i = 0 ; i < CriticalPriority+1; i++)
3480 os::java_to_os_priority[i] = prio_policy1[i];
3481 }
3482 if (UseCriticalJavaThreadPriority) {
3483 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3484 // See set_native_priority() and set_lwp_class_and_priority().
3485 // Save original MaxPriority mapping in case attempt to
3486 // use critical priority fails.
3487 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3488 // Set negative to distinguish from other priorities
3489 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3490 }
3491 }
3492 // Not using Bound Threads, set to ThreadPolicy 1
3493 else {
3494 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3495 os::java_to_os_priority[i] = prio_policy1[i];
3496 }
3497 return 0;
3498 }
3499
3500 // Get IDs for a set of well-known scheduling classes.
3501 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3502 // the system. We should have a loop that iterates over the
3503 // classID values, which are known to be "small" integers.
3504
3505 strcpy(ClassInfo.pc_clname, "TS");
3506 ClassInfo.pc_cid = -1;
3507 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3508 if (rslt < 0) return errno;
3509 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3510 tsLimits.schedPolicy = ClassInfo.pc_cid;
3511 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3512 tsLimits.minPrio = -tsLimits.maxPrio;
3513
3514 strcpy(ClassInfo.pc_clname, "IA");
3515 ClassInfo.pc_cid = -1;
3516 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3517 if (rslt < 0) return errno;
3518 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3519 iaLimits.schedPolicy = ClassInfo.pc_cid;
3520 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3521 iaLimits.minPrio = -iaLimits.maxPrio;
3522
3523 strcpy(ClassInfo.pc_clname, "RT");
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 RT class is -1");
3528 rtLimits.schedPolicy = ClassInfo.pc_cid;
3529 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3530 rtLimits.minPrio = 0;
3531
3532 strcpy(ClassInfo.pc_clname, "FX");
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 FX class is -1");
3537 fxLimits.schedPolicy = ClassInfo.pc_cid;
3538 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3539 fxLimits.minPrio = 0;
3540
3541 // Query our "current" scheduling class.
3542 // This will normally be IA, TS or, rarely, FX or RT.
3543 memset(&ParmInfo, 0, sizeof(ParmInfo));
3544 ParmInfo.pc_cid = PC_CLNULL;
3545 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3546 if (rslt < 0) return errno;
3547 myClass = ParmInfo.pc_cid;
3548
3549 // We now know our scheduling classId, get specific information
3550 // about the class.
3551 ClassInfo.pc_cid = myClass;
3552 ClassInfo.pc_clname[0] = 0;
3553 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3554 if (rslt < 0) return errno;
3555
3556 if (ThreadPriorityVerbose) {
3557 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3558 }
3559
3560 memset(&ParmInfo, 0, sizeof(pcparms_t));
3561 ParmInfo.pc_cid = PC_CLNULL;
3562 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3563 if (rslt < 0) return errno;
3564
3565 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3566 myMin = rtLimits.minPrio;
3567 myMax = rtLimits.maxPrio;
3568 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3569 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3570 myMin = iaLimits.minPrio;
3571 myMax = iaLimits.maxPrio;
3572 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3573 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3574 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3575 myMin = tsLimits.minPrio;
3576 myMax = tsLimits.maxPrio;
3577 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3578 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3579 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3580 myMin = fxLimits.minPrio;
3581 myMax = fxLimits.maxPrio;
3582 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3583 } else {
3584 // No clue - punt
3585 if (ThreadPriorityVerbose)
3586 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3587 return EINVAL; // no clue, punt
3588 }
3589
3590 if (ThreadPriorityVerbose) {
3591 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3592 }
3593
3594 priocntl_enable = true; // Enable changing priorities
3595 return 0;
3596 }
3597
3598 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3599 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3600 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3601 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3602
3603
3604 // scale_to_lwp_priority
3605 //
3606 // Convert from the libthread "thr_setprio" scale to our current
3607 // lwp scheduling class scale.
3608 //
3609 static
3610 int scale_to_lwp_priority (int rMin, int rMax, int x)
3611 {
3612 int v;
3613
3614 if (x == 127) return rMax; // avoid round-down
3615 v = (((x*(rMax-rMin)))/128)+rMin;
3616 return v;
3617 }
3618
3619
3620 // set_lwp_class_and_priority
3621 //
3622 // Set the class and priority of the lwp. This call should only
3623 // be made when using bound threads (T2 threads are bound by default).
3624 //
3625 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3626 int newPrio, int new_class, bool scale) {
3627 int rslt;
3628 int Actual, Expected, prv;
3629 pcparms_t ParmInfo; // for GET-SET
3630 #ifdef ASSERT
3631 pcparms_t ReadBack; // for readback
3632 #endif
3633
3634 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3635 // Query current values.
3636 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3637 // Cache "pcparms_t" in global ParmCache.
3638 // TODO: elide set-to-same-value
3639
3640 // If something went wrong on init, don't change priorities.
3641 if ( !priocntl_enable ) {
3642 if (ThreadPriorityVerbose)
3643 tty->print_cr("Trying to set priority but init failed, ignoring");
3644 return EINVAL;
3645 }
3646
3647 // If lwp hasn't started yet, just return
3648 // the _start routine will call us again.
3649 if ( lwpid <= 0 ) {
3650 if (ThreadPriorityVerbose) {
3651 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3652 INTPTR_FORMAT " to %d, lwpid not set",
3653 ThreadID, newPrio);
3654 }
3655 return 0;
3656 }
3657
3658 if (ThreadPriorityVerbose) {
3659 tty->print_cr ("set_lwp_class_and_priority("
3660 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3661 ThreadID, lwpid, newPrio);
3662 }
3663
3664 memset(&ParmInfo, 0, sizeof(pcparms_t));
3665 ParmInfo.pc_cid = PC_CLNULL;
3666 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3667 if (rslt < 0) return errno;
3668
3669 int cur_class = ParmInfo.pc_cid;
3670 ParmInfo.pc_cid = (id_t)new_class;
3671
3672 if (new_class == rtLimits.schedPolicy) {
3673 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3674 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3675 rtLimits.maxPrio, newPrio)
3676 : newPrio;
3677 rtInfo->rt_tqsecs = RT_NOCHANGE;
3678 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3679 if (ThreadPriorityVerbose) {
3680 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3681 }
3682 } else if (new_class == iaLimits.schedPolicy) {
3683 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3684 int maxClamped = MIN2(iaLimits.maxPrio,
3685 cur_class == new_class
3686 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3687 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3688 maxClamped, newPrio)
3689 : newPrio;
3690 iaInfo->ia_uprilim = cur_class == new_class
3691 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3692 iaInfo->ia_mode = IA_NOCHANGE;
3693 if (ThreadPriorityVerbose) {
3694 tty->print_cr("IA: [%d...%d] %d->%d\n",
3695 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3696 }
3697 } else if (new_class == tsLimits.schedPolicy) {
3698 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3699 int maxClamped = MIN2(tsLimits.maxPrio,
3700 cur_class == new_class
3701 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3702 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3703 maxClamped, newPrio)
3704 : newPrio;
3705 tsInfo->ts_uprilim = cur_class == new_class
3706 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3707 if (ThreadPriorityVerbose) {
3708 tty->print_cr("TS: [%d...%d] %d->%d\n",
3709 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3710 }
3711 } else if (new_class == fxLimits.schedPolicy) {
3712 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3713 int maxClamped = MIN2(fxLimits.maxPrio,
3714 cur_class == new_class
3715 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3716 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3717 maxClamped, newPrio)
3718 : newPrio;
3719 fxInfo->fx_uprilim = cur_class == new_class
3720 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3721 fxInfo->fx_tqsecs = FX_NOCHANGE;
3722 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3723 if (ThreadPriorityVerbose) {
3724 tty->print_cr("FX: [%d...%d] %d->%d\n",
3725 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3726 }
3727 } else {
3728 if (ThreadPriorityVerbose) {
3729 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3730 }
3731 return EINVAL; // no clue, punt
3732 }
3733
3734 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3735 if (ThreadPriorityVerbose && rslt) {
3736 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3737 }
3738 if (rslt < 0) return errno;
3739
3740 #ifdef ASSERT
3741 // Sanity check: read back what we just attempted to set.
3742 // In theory it could have changed in the interim ...
3743 //
3744 // The priocntl system call is tricky.
3745 // Sometimes it'll validate the priority value argument and
3746 // return EINVAL if unhappy. At other times it fails silently.
3747 // Readbacks are prudent.
3748
3749 if (!ReadBackValidate) return 0;
3750
3751 memset(&ReadBack, 0, sizeof(pcparms_t));
3752 ReadBack.pc_cid = PC_CLNULL;
3753 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3754 assert(rslt >= 0, "priocntl failed");
3755 Actual = Expected = 0xBAD;
3756 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3757 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3758 Actual = RTPRI(ReadBack)->rt_pri;
3759 Expected = RTPRI(ParmInfo)->rt_pri;
3760 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3761 Actual = IAPRI(ReadBack)->ia_upri;
3762 Expected = IAPRI(ParmInfo)->ia_upri;
3763 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3764 Actual = TSPRI(ReadBack)->ts_upri;
3765 Expected = TSPRI(ParmInfo)->ts_upri;
3766 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3767 Actual = FXPRI(ReadBack)->fx_upri;
3768 Expected = FXPRI(ParmInfo)->fx_upri;
3769 } else {
3770 if (ThreadPriorityVerbose) {
3771 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3772 ParmInfo.pc_cid);
3773 }
3774 }
3775
3776 if (Actual != Expected) {
3777 if (ThreadPriorityVerbose) {
3778 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3779 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3780 }
3781 }
3782 #endif
3783
3784 return 0;
3785 }
3786
3787 // Solaris only gives access to 128 real priorities at a time,
3788 // so we expand Java's ten to fill this range. This would be better
3789 // if we dynamically adjusted relative priorities.
3790 //
3791 // The ThreadPriorityPolicy option allows us to select 2 different
3792 // priority scales.
3793 //
3794 // ThreadPriorityPolicy=0
3795 // Since the Solaris' default priority is MaximumPriority, we do not
3796 // set a priority lower than Max unless a priority lower than
3797 // NormPriority is requested.
3798 //
3799 // ThreadPriorityPolicy=1
3800 // This mode causes the priority table to get filled with
3801 // linear values. NormPriority get's mapped to 50% of the
3802 // Maximum priority an so on. This will cause VM threads
3803 // to get unfair treatment against other Solaris processes
3804 // which do not explicitly alter their thread priorities.
3805 //
3806
3807 int os::java_to_os_priority[CriticalPriority + 1] = {
3808 -99999, // 0 Entry should never be used
3809
3810 0, // 1 MinPriority
3811 32, // 2
3812 64, // 3
3813
3814 96, // 4
3815 127, // 5 NormPriority
3816 127, // 6
3817
3818 127, // 7
3819 127, // 8
3820 127, // 9 NearMaxPriority
3821
3822 127, // 10 MaxPriority
3823
3824 -criticalPrio // 11 CriticalPriority
3825 };
3826
3827 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3828 OSThread* osthread = thread->osthread();
3829
3830 // Save requested priority in case the thread hasn't been started
3831 osthread->set_native_priority(newpri);
3832
3833 // Check for critical priority request
3834 bool fxcritical = false;
3835 if (newpri == -criticalPrio) {
3836 fxcritical = true;
3837 newpri = criticalPrio;
3838 }
3839
3840 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3841 if (!UseThreadPriorities) return OS_OK;
3842
3843 int status = 0;
3844
3845 if (!fxcritical) {
3846 // Use thr_setprio only if we have a priority that thr_setprio understands
3847 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3848 }
3849
3850 if (os::Solaris::T2_libthread() ||
3851 (UseBoundThreads && osthread->is_vm_created())) {
3852 int lwp_status =
3853 set_lwp_class_and_priority(osthread->thread_id(),
3854 osthread->lwp_id(),
3855 newpri,
3856 fxcritical ? fxLimits.schedPolicy : myClass,
3857 !fxcritical);
3858 if (lwp_status != 0 && fxcritical) {
3859 // Try again, this time without changing the scheduling class
3860 newpri = java_MaxPriority_to_os_priority;
3861 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3862 osthread->lwp_id(),
3863 newpri, myClass, false);
3864 }
3865 status |= lwp_status;
3866 }
3867 return (status == 0) ? OS_OK : OS_ERR;
3868 }
3869
3870
3871 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3872 int p;
3873 if ( !UseThreadPriorities ) {
3874 *priority_ptr = NormalPriority;
3875 return OS_OK;
3876 }
3877 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3878 if (status != 0) {
3879 return OS_ERR;
3880 }
3881 *priority_ptr = p;
3882 return OS_OK;
3883 }
3884
3885
3886 // Hint to the underlying OS that a task switch would not be good.
3887 // Void return because it's a hint and can fail.
3888 void os::hint_no_preempt() {
3889 schedctl_start(schedctl_init());
3890 }
3891
3892 static void resume_clear_context(OSThread *osthread) {
3893 osthread->set_ucontext(NULL);
3894 }
3895
3896 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3897 osthread->set_ucontext(context);
3898 }
3899
3900 static Semaphore sr_semaphore;
3901
3902 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3903 // Save and restore errno to avoid confusing native code with EINTR
3904 // after sigsuspend.
3905 int old_errno = errno;
3906
3907 OSThread* osthread = thread->osthread();
3908 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3909
3910 os::SuspendResume::State current = osthread->sr.state();
3911 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3912 suspend_save_context(osthread, uc);
3913
3914 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3915 os::SuspendResume::State state = osthread->sr.suspended();
3916 if (state == os::SuspendResume::SR_SUSPENDED) {
3917 sigset_t suspend_set; // signals for sigsuspend()
3918
3919 // get current set of blocked signals and unblock resume signal
3920 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3921 sigdelset(&suspend_set, os::Solaris::SIGasync());
3922
3923 sr_semaphore.signal();
3924 // wait here until we are resumed
3925 while (1) {
3926 sigsuspend(&suspend_set);
3927
3928 os::SuspendResume::State result = osthread->sr.running();
3929 if (result == os::SuspendResume::SR_RUNNING) {
3930 sr_semaphore.signal();
3931 break;
3932 }
3933 }
3934
3935 } else if (state == os::SuspendResume::SR_RUNNING) {
3936 // request was cancelled, continue
3937 } else {
3938 ShouldNotReachHere();
3939 }
3940
3941 resume_clear_context(osthread);
3942 } else if (current == os::SuspendResume::SR_RUNNING) {
3943 // request was cancelled, continue
3944 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3945 // ignore
3946 } else {
3947 // ignore
3948 }
3949
3950 errno = old_errno;
3951 }
3952
3953
3954 void os::interrupt(Thread* thread) {
3955 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3956
3957 OSThread* osthread = thread->osthread();
3958
3959 int isInterrupted = osthread->interrupted();
3960 if (!isInterrupted) {
3961 osthread->set_interrupted(true);
3962 OrderAccess::fence();
3963 // os::sleep() is implemented with either poll (NULL,0,timeout) or
3964 // by parking on _SleepEvent. If the former, thr_kill will unwedge
3965 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
3966 ParkEvent * const slp = thread->_SleepEvent ;
3967 if (slp != NULL) slp->unpark() ;
3968 }
3969
3970 // For JSR166: unpark after setting status but before thr_kill -dl
3971 if (thread->is_Java_thread()) {
3972 ((JavaThread*)thread)->parker()->unpark();
3973 }
3974
3975 // Handle interruptible wait() ...
3976 ParkEvent * const ev = thread->_ParkEvent ;
3977 if (ev != NULL) ev->unpark() ;
3978
3979 // When events are used everywhere for os::sleep, then this thr_kill
3980 // will only be needed if UseVMInterruptibleIO is true.
3981
3982 if (!isInterrupted) {
3983 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
3984 assert_status(status == 0, status, "thr_kill");
3985
3986 // Bump thread interruption counter
3987 RuntimeService::record_thread_interrupt_signaled_count();
3988 }
3989 }
3990
3991
3992 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3993 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3994
3995 OSThread* osthread = thread->osthread();
3996
3997 bool res = osthread->interrupted();
3998
3999 // NOTE that since there is no "lock" around these two operations,
4000 // there is the possibility that the interrupted flag will be
4001 // "false" but that the interrupt event will be set. This is
4002 // intentional. The effect of this is that Object.wait() will appear
4003 // to have a spurious wakeup, which is not harmful, and the
4004 // possibility is so rare that it is not worth the added complexity
4005 // to add yet another lock. It has also been recommended not to put
4006 // the interrupted flag into the os::Solaris::Event structure,
4007 // because it hides the issue.
4008 if (res && clear_interrupted) {
4009 osthread->set_interrupted(false);
4010 }
4011 return res;
4012 }
4013
4014
4015 void os::print_statistics() {
4016 }
4017
4018 int os::message_box(const char* title, const char* message) {
4019 int i;
4020 fdStream err(defaultStream::error_fd());
4021 for (i = 0; i < 78; i++) err.print_raw("=");
4022 err.cr();
4023 err.print_raw_cr(title);
4024 for (i = 0; i < 78; i++) err.print_raw("-");
4025 err.cr();
4026 err.print_raw_cr(message);
4027 for (i = 0; i < 78; i++) err.print_raw("=");
4028 err.cr();
4029
4030 char buf[16];
4031 // Prevent process from exiting upon "read error" without consuming all CPU
4032 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4033
4034 return buf[0] == 'y' || buf[0] == 'Y';
4035 }
4036
4037 static int sr_notify(OSThread* osthread) {
4038 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4039 assert_status(status == 0, status, "thr_kill");
4040 return status;
4041 }
4042
4043 // "Randomly" selected value for how long we want to spin
4044 // before bailing out on suspending a thread, also how often
4045 // we send a signal to a thread we want to resume
4046 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4047 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4048
4049 static bool do_suspend(OSThread* osthread) {
4050 assert(osthread->sr.is_running(), "thread should be running");
4051 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4052
4053 // mark as suspended and send signal
4054 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4055 // failed to switch, state wasn't running?
4056 ShouldNotReachHere();
4057 return false;
4058 }
4059
4060 if (sr_notify(osthread) != 0) {
4061 ShouldNotReachHere();
4062 }
4063
4064 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4065 while (true) {
4066 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4067 break;
4068 } else {
4069 // timeout
4070 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4071 if (cancelled == os::SuspendResume::SR_RUNNING) {
4072 return false;
4073 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4074 // make sure that we consume the signal on the semaphore as well
4075 sr_semaphore.wait();
4076 break;
4077 } else {
4078 ShouldNotReachHere();
4079 return false;
4080 }
4081 }
4082 }
4083
4084 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4085 return true;
4086 }
4087
4088 static void do_resume(OSThread* osthread) {
4089 assert(osthread->sr.is_suspended(), "thread should be suspended");
4090 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4091
4092 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4093 // failed to switch to WAKEUP_REQUEST
4094 ShouldNotReachHere();
4095 return;
4096 }
4097
4098 while (true) {
4099 if (sr_notify(osthread) == 0) {
4100 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4101 if (osthread->sr.is_running()) {
4102 return;
4103 }
4104 }
4105 } else {
4106 ShouldNotReachHere();
4107 }
4108 }
4109
4110 guarantee(osthread->sr.is_running(), "Must be running!");
4111 }
4112
4113 void os::SuspendedThreadTask::internal_do_task() {
4114 if (do_suspend(_thread->osthread())) {
4115 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4116 do_task(context);
4117 do_resume(_thread->osthread());
4118 }
4119 }
4120
4121 class PcFetcher : public os::SuspendedThreadTask {
4122 public:
4123 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4124 ExtendedPC result();
4125 protected:
4126 void do_task(const os::SuspendedThreadTaskContext& context);
4127 private:
4128 ExtendedPC _epc;
4129 };
4130
4131 ExtendedPC PcFetcher::result() {
4132 guarantee(is_done(), "task is not done yet.");
4133 return _epc;
4134 }
4135
4136 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4137 Thread* thread = context.thread();
4138 OSThread* osthread = thread->osthread();
4139 if (osthread->ucontext() != NULL) {
4140 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4141 } else {
4142 // NULL context is unexpected, double-check this is the VMThread
4143 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4144 }
4145 }
4146
4147 // A lightweight implementation that does not suspend the target thread and
4148 // thus returns only a hint. Used for profiling only!
4149 ExtendedPC os::get_thread_pc(Thread* thread) {
4150 // Make sure that it is called by the watcher and the Threads lock is owned.
4151 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4152 // For now, is only used to profile the VM Thread
4153 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4154 PcFetcher fetcher(thread);
4155 fetcher.run();
4156 return fetcher.result();
4157 }
4158
4159
4160 // This does not do anything on Solaris. This is basically a hook for being
4161 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4162 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4163 f(value, method, args, thread);
4164 }
4165
4166 // This routine may be used by user applications as a "hook" to catch signals.
4167 // The user-defined signal handler must pass unrecognized signals to this
4168 // routine, and if it returns true (non-zero), then the signal handler must
4169 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4170 // routine will never retun false (zero), but instead will execute a VM panic
4171 // routine kill the process.
4172 //
4173 // If this routine returns false, it is OK to call it again. This allows
4174 // the user-defined signal handler to perform checks either before or after
4175 // the VM performs its own checks. Naturally, the user code would be making
4176 // a serious error if it tried to handle an exception (such as a null check
4177 // or breakpoint) that the VM was generating for its own correct operation.
4178 //
4179 // This routine may recognize any of the following kinds of signals:
4180 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4181 // os::Solaris::SIGasync
4182 // It should be consulted by handlers for any of those signals.
4183 // It explicitly does not recognize os::Solaris::SIGinterrupt
4184 //
4185 // The caller of this routine must pass in the three arguments supplied
4186 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4187 // field of the structure passed to sigaction(). This routine assumes that
4188 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4189 //
4190 // Note that the VM will print warnings if it detects conflicting signal
4191 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4192 //
4193 extern "C" JNIEXPORT int
4194 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4195 int abort_if_unrecognized);
4196
4197
4198 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4199 int orig_errno = errno; // Preserve errno value over signal handler.
4200 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4201 errno = orig_errno;
4202 }
4203
4204 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4205 is needed to provoke threads blocked on IO to return an EINTR
4206 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4207 does NOT participate in signal chaining due to requirement for
4208 NOT setting SA_RESTART to make EINTR work. */
4209 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4210 if (UseSignalChaining) {
4211 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4212 if (actp && actp->sa_handler) {
4213 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4214 }
4215 }
4216 }
4217
4218 // This boolean allows users to forward their own non-matching signals
4219 // to JVM_handle_solaris_signal, harmlessly.
4220 bool os::Solaris::signal_handlers_are_installed = false;
4221
4222 // For signal-chaining
4223 bool os::Solaris::libjsig_is_loaded = false;
4224 typedef struct sigaction *(*get_signal_t)(int);
4225 get_signal_t os::Solaris::get_signal_action = NULL;
4226
4227 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4228 struct sigaction *actp = NULL;
4229
4230 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4231 // Retrieve the old signal handler from libjsig
4232 actp = (*get_signal_action)(sig);
4233 }
4234 if (actp == NULL) {
4235 // Retrieve the preinstalled signal handler from jvm
4236 actp = get_preinstalled_handler(sig);
4237 }
4238
4239 return actp;
4240 }
4241
4242 static bool call_chained_handler(struct sigaction *actp, int sig,
4243 siginfo_t *siginfo, void *context) {
4244 // Call the old signal handler
4245 if (actp->sa_handler == SIG_DFL) {
4246 // It's more reasonable to let jvm treat it as an unexpected exception
4247 // instead of taking the default action.
4248 return false;
4249 } else if (actp->sa_handler != SIG_IGN) {
4250 if ((actp->sa_flags & SA_NODEFER) == 0) {
4251 // automaticlly block the signal
4252 sigaddset(&(actp->sa_mask), sig);
4253 }
4254
4255 sa_handler_t hand;
4256 sa_sigaction_t sa;
4257 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4258 // retrieve the chained handler
4259 if (siginfo_flag_set) {
4260 sa = actp->sa_sigaction;
4261 } else {
4262 hand = actp->sa_handler;
4263 }
4264
4265 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4266 actp->sa_handler = SIG_DFL;
4267 }
4268
4269 // try to honor the signal mask
4270 sigset_t oset;
4271 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4272
4273 // call into the chained handler
4274 if (siginfo_flag_set) {
4275 (*sa)(sig, siginfo, context);
4276 } else {
4277 (*hand)(sig);
4278 }
4279
4280 // restore the signal mask
4281 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4282 }
4283 // Tell jvm's signal handler the signal is taken care of.
4284 return true;
4285 }
4286
4287 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4288 bool chained = false;
4289 // signal-chaining
4290 if (UseSignalChaining) {
4291 struct sigaction *actp = get_chained_signal_action(sig);
4292 if (actp != NULL) {
4293 chained = call_chained_handler(actp, sig, siginfo, context);
4294 }
4295 }
4296 return chained;
4297 }
4298
4299 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4300 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4301 if (preinstalled_sigs[sig] != 0) {
4302 return &chainedsigactions[sig];
4303 }
4304 return NULL;
4305 }
4306
4307 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4308
4309 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4310 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4311 chainedsigactions[sig] = oldAct;
4312 preinstalled_sigs[sig] = 1;
4313 }
4314
4315 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4316 // Check for overwrite.
4317 struct sigaction oldAct;
4318 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4319 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4320 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4321 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4322 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4323 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4324 if (AllowUserSignalHandlers || !set_installed) {
4325 // Do not overwrite; user takes responsibility to forward to us.
4326 return;
4327 } else if (UseSignalChaining) {
4328 if (oktochain) {
4329 // save the old handler in jvm
4330 save_preinstalled_handler(sig, oldAct);
4331 } else {
4332 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4333 }
4334 // libjsig also interposes the sigaction() call below and saves the
4335 // old sigaction on it own.
4336 } else {
4337 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4338 "%#lx for signal %d.", (long)oldhand, sig));
4339 }
4340 }
4341
4342 struct sigaction sigAct;
4343 sigfillset(&(sigAct.sa_mask));
4344 sigAct.sa_handler = SIG_DFL;
4345
4346 sigAct.sa_sigaction = signalHandler;
4347 // Handle SIGSEGV on alternate signal stack if
4348 // not using stack banging
4349 if (!UseStackBanging && sig == SIGSEGV) {
4350 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4351 // Interruptible i/o requires SA_RESTART cleared so EINTR
4352 // is returned instead of restarting system calls
4353 } else if (sig == os::Solaris::SIGinterrupt()) {
4354 sigemptyset(&sigAct.sa_mask);
4355 sigAct.sa_handler = NULL;
4356 sigAct.sa_flags = SA_SIGINFO;
4357 sigAct.sa_sigaction = sigINTRHandler;
4358 } else {
4359 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4360 }
4361 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4362
4363 sigaction(sig, &sigAct, &oldAct);
4364
4365 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4366 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4367 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4368 }
4369
4370
4371 #define DO_SIGNAL_CHECK(sig) \
4372 if (!sigismember(&check_signal_done, sig)) \
4373 os::Solaris::check_signal_handler(sig)
4374
4375 // This method is a periodic task to check for misbehaving JNI applications
4376 // under CheckJNI, we can add any periodic checks here
4377
4378 void os::run_periodic_checks() {
4379 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4380 // thereby preventing a NULL checks.
4381 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4382
4383 if (check_signals == false) return;
4384
4385 // SEGV and BUS if overridden could potentially prevent
4386 // generation of hs*.log in the event of a crash, debugging
4387 // such a case can be very challenging, so we absolutely
4388 // check for the following for a good measure:
4389 DO_SIGNAL_CHECK(SIGSEGV);
4390 DO_SIGNAL_CHECK(SIGILL);
4391 DO_SIGNAL_CHECK(SIGFPE);
4392 DO_SIGNAL_CHECK(SIGBUS);
4393 DO_SIGNAL_CHECK(SIGPIPE);
4394 DO_SIGNAL_CHECK(SIGXFSZ);
4395
4396 // ReduceSignalUsage allows the user to override these handlers
4397 // see comments at the very top and jvm_solaris.h
4398 if (!ReduceSignalUsage) {
4399 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4400 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4401 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4402 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4403 }
4404
4405 // See comments above for using JVM1/JVM2 and UseAltSigs
4406 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4407 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4408
4409 }
4410
4411 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4412
4413 static os_sigaction_t os_sigaction = NULL;
4414
4415 void os::Solaris::check_signal_handler(int sig) {
4416 char buf[O_BUFLEN];
4417 address jvmHandler = NULL;
4418
4419 struct sigaction act;
4420 if (os_sigaction == NULL) {
4421 // only trust the default sigaction, in case it has been interposed
4422 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4423 if (os_sigaction == NULL) return;
4424 }
4425
4426 os_sigaction(sig, (struct sigaction*)NULL, &act);
4427
4428 address thisHandler = (act.sa_flags & SA_SIGINFO)
4429 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4430 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4431
4432
4433 switch(sig) {
4434 case SIGSEGV:
4435 case SIGBUS:
4436 case SIGFPE:
4437 case SIGPIPE:
4438 case SIGXFSZ:
4439 case SIGILL:
4440 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4441 break;
4442
4443 case SHUTDOWN1_SIGNAL:
4444 case SHUTDOWN2_SIGNAL:
4445 case SHUTDOWN3_SIGNAL:
4446 case BREAK_SIGNAL:
4447 jvmHandler = (address)user_handler();
4448 break;
4449
4450 default:
4451 int intrsig = os::Solaris::SIGinterrupt();
4452 int asynsig = os::Solaris::SIGasync();
4453
4454 if (sig == intrsig) {
4455 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4456 } else if (sig == asynsig) {
4457 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4458 } else {
4459 return;
4460 }
4461 break;
4462 }
4463
4464
4465 if (thisHandler != jvmHandler) {
4466 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4467 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4468 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4469 // No need to check this sig any longer
4470 sigaddset(&check_signal_done, sig);
4471 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4472 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4473 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4474 exception_name(sig, buf, O_BUFLEN));
4475 }
4476 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4477 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4478 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4479 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4480 // No need to check this sig any longer
4481 sigaddset(&check_signal_done, sig);
4482 }
4483
4484 // Print all the signal handler state
4485 if (sigismember(&check_signal_done, sig)) {
4486 print_signal_handlers(tty, buf, O_BUFLEN);
4487 }
4488
4489 }
4490
4491 void os::Solaris::install_signal_handlers() {
4492 bool libjsigdone = false;
4493 signal_handlers_are_installed = true;
4494
4495 // signal-chaining
4496 typedef void (*signal_setting_t)();
4497 signal_setting_t begin_signal_setting = NULL;
4498 signal_setting_t end_signal_setting = NULL;
4499 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4500 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4501 if (begin_signal_setting != NULL) {
4502 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4503 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4504 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4505 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4506 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4507 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4508 libjsig_is_loaded = true;
4509 if (os::Solaris::get_libjsig_version != NULL) {
4510 libjsigversion = (*os::Solaris::get_libjsig_version)();
4511 }
4512 assert(UseSignalChaining, "should enable signal-chaining");
4513 }
4514 if (libjsig_is_loaded) {
4515 // Tell libjsig jvm is setting signal handlers
4516 (*begin_signal_setting)();
4517 }
4518
4519 set_signal_handler(SIGSEGV, true, true);
4520 set_signal_handler(SIGPIPE, true, true);
4521 set_signal_handler(SIGXFSZ, true, true);
4522 set_signal_handler(SIGBUS, true, true);
4523 set_signal_handler(SIGILL, true, true);
4524 set_signal_handler(SIGFPE, true, true);
4525
4526
4527 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4528
4529 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4530 // can not register overridable signals which might be > 32
4531 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4532 // Tell libjsig jvm has finished setting signal handlers
4533 (*end_signal_setting)();
4534 libjsigdone = true;
4535 }
4536 }
4537
4538 // Never ok to chain our SIGinterrupt
4539 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4540 set_signal_handler(os::Solaris::SIGasync(), true, true);
4541
4542 if (libjsig_is_loaded && !libjsigdone) {
4543 // Tell libjsig jvm finishes setting signal handlers
4544 (*end_signal_setting)();
4545 }
4546
4547 // We don't activate signal checker if libjsig is in place, we trust ourselves
4548 // and if UserSignalHandler is installed all bets are off.
4549 // Log that signal checking is off only if -verbose:jni is specified.
4550 if (CheckJNICalls) {
4551 if (libjsig_is_loaded) {
4552 if (PrintJNIResolving) {
4553 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4554 }
4555 check_signals = false;
4556 }
4557 if (AllowUserSignalHandlers) {
4558 if (PrintJNIResolving) {
4559 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4560 }
4561 check_signals = false;
4562 }
4563 }
4564 }
4565
4566
4567 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4568
4569 const char * signames[] = {
4570 "SIG0",
4571 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4572 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4573 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4574 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4575 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4576 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4577 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4578 "SIGCANCEL", "SIGLOST"
4579 };
4580
4581 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4582 if (0 < exception_code && exception_code <= SIGRTMAX) {
4583 // signal
4584 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4585 jio_snprintf(buf, size, "%s", signames[exception_code]);
4586 } else {
4587 jio_snprintf(buf, size, "SIG%d", exception_code);
4588 }
4589 return buf;
4590 } else {
4591 return NULL;
4592 }
4593 }
4594
4595 // (Static) wrappers for the new libthread API
4596 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4597 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4598 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4599 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4600 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4601
4602 // (Static) wrapper for getisax(2) call.
4603 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4604
4605 // (Static) wrappers for the liblgrp API
4606 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4607 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4608 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4609 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4610 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4611 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4612 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4613 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4614 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4615
4616 // (Static) wrapper for meminfo() call.
4617 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4618
4619 static address resolve_symbol_lazy(const char* name) {
4620 address addr = (address) dlsym(RTLD_DEFAULT, name);
4621 if(addr == NULL) {
4622 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4623 addr = (address) dlsym(RTLD_NEXT, name);
4624 }
4625 return addr;
4626 }
4627
4628 static address resolve_symbol(const char* name) {
4629 address addr = resolve_symbol_lazy(name);
4630 if(addr == NULL) {
4631 fatal(dlerror());
4632 }
4633 return addr;
4634 }
4635
4636
4637
4638 // isT2_libthread()
4639 //
4640 // Routine to determine if we are currently using the new T2 libthread.
4641 //
4642 // We determine if we are using T2 by reading /proc/self/lstatus and
4643 // looking for a thread with the ASLWP bit set. If we find this status
4644 // bit set, we must assume that we are NOT using T2. The T2 team
4645 // has approved this algorithm.
4646 //
4647 // We need to determine if we are running with the new T2 libthread
4648 // since setting native thread priorities is handled differently
4649 // when using this library. All threads created using T2 are bound
4650 // threads. Calling thr_setprio is meaningless in this case.
4651 //
4652 bool isT2_libthread() {
4653 static prheader_t * lwpArray = NULL;
4654 static int lwpSize = 0;
4655 static int lwpFile = -1;
4656 lwpstatus_t * that;
4657 char lwpName [128];
4658 bool isT2 = false;
4659
4660 #define ADR(x) ((uintptr_t)(x))
4661 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4662
4663 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4664 if (lwpFile < 0) {
4665 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4666 return false;
4667 }
4668 lwpSize = 16*1024;
4669 for (;;) {
4670 ::lseek64 (lwpFile, 0, SEEK_SET);
4671 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4672 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4673 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4674 break;
4675 }
4676 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4677 // We got a good snapshot - now iterate over the list.
4678 int aslwpcount = 0;
4679 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4680 that = LWPINDEX(lwpArray,i);
4681 if (that->pr_flags & PR_ASLWP) {
4682 aslwpcount++;
4683 }
4684 }
4685 if (aslwpcount == 0) isT2 = true;
4686 break;
4687 }
4688 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4689 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4690 }
4691
4692 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4693 ::close (lwpFile);
4694 if (ThreadPriorityVerbose) {
4695 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4696 else tty->print_cr("We are not running with a T2 libthread\n");
4697 }
4698 return isT2;
4699 }
4700
4701
4702 void os::Solaris::libthread_init() {
4703 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4704
4705 // Determine if we are running with the new T2 libthread
4706 os::Solaris::set_T2_libthread(isT2_libthread());
4707
4708 lwp_priocntl_init();
4709
4710 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4711 if(func == NULL) {
4712 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4713 // Guarantee that this VM is running on an new enough OS (5.6 or
4714 // later) that it will have a new enough libthread.so.
4715 guarantee(func != NULL, "libthread.so is too old.");
4716 }
4717
4718 // Initialize the new libthread getstate API wrappers
4719 func = resolve_symbol("thr_getstate");
4720 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4721
4722 func = resolve_symbol("thr_setstate");
4723 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4724
4725 func = resolve_symbol("thr_setmutator");
4726 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4727
4728 func = resolve_symbol("thr_suspend_mutator");
4729 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4730
4731 func = resolve_symbol("thr_continue_mutator");
4732 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4733
4734 int size;
4735 void (*handler_info_func)(address *, int *);
4736 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4737 handler_info_func(&handler_start, &size);
4738 handler_end = handler_start + size;
4739 }
4740
4741
4742 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4743 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4744 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4745 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4746 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4747 int os::Solaris::_mutex_scope = USYNC_THREAD;
4748
4749 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4750 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4751 int_fnP_cond_tP os::Solaris::_cond_signal;
4752 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4753 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4754 int_fnP_cond_tP os::Solaris::_cond_destroy;
4755 int os::Solaris::_cond_scope = USYNC_THREAD;
4756
4757 void os::Solaris::synchronization_init() {
4758 if(UseLWPSynchronization) {
4759 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4760 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4761 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4762 os::Solaris::set_mutex_init(lwp_mutex_init);
4763 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4764 os::Solaris::set_mutex_scope(USYNC_THREAD);
4765
4766 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4767 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4768 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4769 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4770 os::Solaris::set_cond_init(lwp_cond_init);
4771 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4772 os::Solaris::set_cond_scope(USYNC_THREAD);
4773 }
4774 else {
4775 os::Solaris::set_mutex_scope(USYNC_THREAD);
4776 os::Solaris::set_cond_scope(USYNC_THREAD);
4777
4778 if(UsePthreads) {
4779 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4780 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4781 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4782 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4783 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4784
4785 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4786 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4787 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4788 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4789 os::Solaris::set_cond_init(pthread_cond_default_init);
4790 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4791 }
4792 else {
4793 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4794 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4795 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4796 os::Solaris::set_mutex_init(::mutex_init);
4797 os::Solaris::set_mutex_destroy(::mutex_destroy);
4798
4799 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4800 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4801 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4802 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4803 os::Solaris::set_cond_init(::cond_init);
4804 os::Solaris::set_cond_destroy(::cond_destroy);
4805 }
4806 }
4807 }
4808
4809 bool os::Solaris::liblgrp_init() {
4810 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4811 if (handle != NULL) {
4812 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4813 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4814 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4815 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4816 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4817 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4818 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4819 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4820 dlsym(handle, "lgrp_cookie_stale")));
4821
4822 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4823 set_lgrp_cookie(c);
4824 return true;
4825 }
4826 return false;
4827 }
4828
4829 void os::Solaris::misc_sym_init() {
4830 address func;
4831
4832 // getisax
4833 func = resolve_symbol_lazy("getisax");
4834 if (func != NULL) {
4835 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4836 }
4837
4838 // meminfo
4839 func = resolve_symbol_lazy("meminfo");
4840 if (func != NULL) {
4841 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4842 }
4843 }
4844
4845 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4846 assert(_getisax != NULL, "_getisax not set");
4847 return _getisax(array, n);
4848 }
4849
4850 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4851 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4852 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4853
4854 void init_pset_getloadavg_ptr(void) {
4855 pset_getloadavg_ptr =
4856 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4857 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4858 warning("pset_getloadavg function not found");
4859 }
4860 }
4861
4862 int os::Solaris::_dev_zero_fd = -1;
4863
4864 // this is called _before_ the global arguments have been parsed
4865 void os::init(void) {
4866 _initial_pid = getpid();
4867
4868 max_hrtime = first_hrtime = gethrtime();
4869
4870 init_random(1234567);
4871
4872 page_size = sysconf(_SC_PAGESIZE);
4873 if (page_size == -1)
4874 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4875 strerror(errno)));
4876 init_page_sizes((size_t) page_size);
4877
4878 Solaris::initialize_system_info();
4879
4880 // Initialize misc. symbols as soon as possible, so we can use them
4881 // if we need them.
4882 Solaris::misc_sym_init();
4883
4884 int fd = ::open("/dev/zero", O_RDWR);
4885 if (fd < 0) {
4886 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4887 } else {
4888 Solaris::set_dev_zero_fd(fd);
4889
4890 // Close on exec, child won't inherit.
4891 fcntl(fd, F_SETFD, FD_CLOEXEC);
4892 }
4893
4894 clock_tics_per_sec = CLK_TCK;
4895
4896 // check if dladdr1() exists; dladdr1 can provide more information than
4897 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4898 // and is available on linker patches for 5.7 and 5.8.
4899 // libdl.so must have been loaded, this call is just an entry lookup
4900 void * hdl = dlopen("libdl.so", RTLD_NOW);
4901 if (hdl)
4902 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4903
4904 // (Solaris only) this switches to calls that actually do locking.
4905 ThreadCritical::initialize();
4906
4907 // main_thread points to the thread that created/loaded the JVM.
4908 main_thread = thr_self();
4909
4910 // Constant minimum stack size allowed. It must be at least
4911 // the minimum of what the OS supports (thr_min_stack()), and
4912 // enough to allow the thread to get to user bytecode execution.
4913 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4914 // If the pagesize of the VM is greater than 8K determine the appropriate
4915 // number of initial guard pages. The user can change this with the
4916 // command line arguments, if needed.
4917 if (vm_page_size() > 8*K) {
4918 StackYellowPages = 1;
4919 StackRedPages = 1;
4920 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4921 }
4922 }
4923
4924 // To install functions for atexit system call
4925 extern "C" {
4926 static void perfMemory_exit_helper() {
4927 perfMemory_exit();
4928 }
4929 }
4930
4931 // this is called _after_ the global arguments have been parsed
4932 jint os::init_2(void) {
4933 // try to enable extended file IO ASAP, see 6431278
4934 os::Solaris::try_enable_extended_io();
4935
4936 // Allocate a single page and mark it as readable for safepoint polling. Also
4937 // use this first mmap call to check support for MAP_ALIGN.
4938 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4939 page_size,
4940 MAP_PRIVATE | MAP_ALIGN,
4941 PROT_READ);
4942 if (polling_page == NULL) {
4943 has_map_align = false;
4944 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4945 PROT_READ);
4946 }
4947
4948 os::set_polling_page(polling_page);
4949
4950 #ifndef PRODUCT
4951 if( Verbose && PrintMiscellaneous )
4952 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4953 #endif
4954
4955 if (!UseMembar) {
4956 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4957 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4958 os::set_memory_serialize_page( mem_serialize_page );
4959
4960 #ifndef PRODUCT
4961 if(Verbose && PrintMiscellaneous)
4962 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4963 #endif
4964 }
4965
4966 // Check minimum allowable stack size for thread creation and to initialize
4967 // the java system classes, including StackOverflowError - depends on page
4968 // size. Add a page for compiler2 recursion in main thread.
4969 // Add in 2*BytesPerWord times page size to account for VM stack during
4970 // class initialization depending on 32 or 64 bit VM.
4971 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4972 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4973 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4974
4975 size_t threadStackSizeInBytes = ThreadStackSize * K;
4976 if (threadStackSizeInBytes != 0 &&
4977 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4978 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4979 os::Solaris::min_stack_allowed/K);
4980 return JNI_ERR;
4981 }
4982
4983 // For 64kbps there will be a 64kb page size, which makes
4984 // the usable default stack size quite a bit less. Increase the
4985 // stack for 64kb (or any > than 8kb) pages, this increases
4986 // virtual memory fragmentation (since we're not creating the
4987 // stack on a power of 2 boundary. The real fix for this
4988 // should be to fix the guard page mechanism.
4989
4990 if (vm_page_size() > 8*K) {
4991 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4992 ? threadStackSizeInBytes +
4993 ((StackYellowPages + StackRedPages) * vm_page_size())
4994 : 0;
4995 ThreadStackSize = threadStackSizeInBytes/K;
4996 }
4997
4998 // Make the stack size a multiple of the page size so that
4999 // the yellow/red zones can be guarded.
5000 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
5001 vm_page_size()));
5002
5003 Solaris::libthread_init();
5004
5005 if (UseNUMA) {
5006 if (!Solaris::liblgrp_init()) {
5007 UseNUMA = false;
5008 } else {
5009 size_t lgrp_limit = os::numa_get_groups_num();
5010 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5011 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5012 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5013 if (lgrp_num < 2) {
5014 // There's only one locality group, disable NUMA.
5015 UseNUMA = false;
5016 }
5017 }
5018 if (!UseNUMA && ForceNUMA) {
5019 UseNUMA = true;
5020 }
5021 }
5022
5023 Solaris::signal_sets_init();
5024 Solaris::init_signal_mem();
5025 Solaris::install_signal_handlers();
5026
5027 if (libjsigversion < JSIG_VERSION_1_4_1) {
5028 Maxlibjsigsigs = OLDMAXSIGNUM;
5029 }
5030
5031 // initialize synchronization primitives to use either thread or
5032 // lwp synchronization (controlled by UseLWPSynchronization)
5033 Solaris::synchronization_init();
5034
5035 if (MaxFDLimit) {
5036 // set the number of file descriptors to max. print out error
5037 // if getrlimit/setrlimit fails but continue regardless.
5038 struct rlimit nbr_files;
5039 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5040 if (status != 0) {
5041 if (PrintMiscellaneous && (Verbose || WizardMode))
5042 perror("os::init_2 getrlimit failed");
5043 } else {
5044 nbr_files.rlim_cur = nbr_files.rlim_max;
5045 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5046 if (status != 0) {
5047 if (PrintMiscellaneous && (Verbose || WizardMode))
5048 perror("os::init_2 setrlimit failed");
5049 }
5050 }
5051 }
5052
5053 // Calculate theoretical max. size of Threads to guard gainst
5054 // artifical out-of-memory situations, where all available address-
5055 // space has been reserved by thread stacks. Default stack size is 1Mb.
5056 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5057 JavaThread::stack_size_at_create() : (1*K*K);
5058 assert(pre_thread_stack_size != 0, "Must have a stack");
5059 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5060 // we should start doing Virtual Memory banging. Currently when the threads will
5061 // have used all but 200Mb of space.
5062 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5063 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5064
5065 // at-exit methods are called in the reverse order of their registration.
5066 // In Solaris 7 and earlier, atexit functions are called on return from
5067 // main or as a result of a call to exit(3C). There can be only 32 of
5068 // these functions registered and atexit() does not set errno. In Solaris
5069 // 8 and later, there is no limit to the number of functions registered
5070 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5071 // functions are called upon dlclose(3DL) in addition to return from main
5072 // and exit(3C).
5073
5074 if (PerfAllowAtExitRegistration) {
5075 // only register atexit functions if PerfAllowAtExitRegistration is set.
5076 // atexit functions can be delayed until process exit time, which
5077 // can be problematic for embedded VM situations. Embedded VMs should
5078 // call DestroyJavaVM() to assure that VM resources are released.
5079
5080 // note: perfMemory_exit_helper atexit function may be removed in
5081 // the future if the appropriate cleanup code can be added to the
5082 // VM_Exit VMOperation's doit method.
5083 if (atexit(perfMemory_exit_helper) != 0) {
5084 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5085 }
5086 }
5087
5088 // Init pset_loadavg function pointer
5089 init_pset_getloadavg_ptr();
5090
5091 return JNI_OK;
5092 }
5093
5094 // Mark the polling page as unreadable
5095 void os::make_polling_page_unreadable(void) {
5096 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5097 fatal("Could not disable polling page");
5098 };
5099
5100 // Mark the polling page as readable
5101 void os::make_polling_page_readable(void) {
5102 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5103 fatal("Could not enable polling page");
5104 };
5105
5106 // OS interface.
5107
5108 bool os::check_heap(bool force) { return true; }
5109
5110 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5111 static vsnprintf_t sol_vsnprintf = NULL;
5112
5113 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5114 if (!sol_vsnprintf) {
5115 //search for the named symbol in the objects that were loaded after libjvm
5116 void* where = RTLD_NEXT;
5117 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5118 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5119 if (!sol_vsnprintf){
5120 //search for the named symbol in the objects that were loaded before libjvm
5121 where = RTLD_DEFAULT;
5122 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5123 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5124 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5125 }
5126 }
5127 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5128 }
5129
5130
5131 // Is a (classpath) directory empty?
5132 bool os::dir_is_empty(const char* path) {
5133 DIR *dir = NULL;
5134 struct dirent *ptr;
5135
5136 dir = opendir(path);
5137 if (dir == NULL) return true;
5138
5139 /* Scan the directory */
5140 bool result = true;
5141 char buf[sizeof(struct dirent) + MAX_PATH];
5142 struct dirent *dbuf = (struct dirent *) buf;
5143 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5144 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5145 result = false;
5146 }
5147 }
5148 closedir(dir);
5149 return result;
5150 }
5151
5152 // This code originates from JDK's sysOpen and open64_w
5153 // from src/solaris/hpi/src/system_md.c
5154
5155 #ifndef O_DELETE
5156 #define O_DELETE 0x10000
5157 #endif
5158
5159 // Open a file. Unlink the file immediately after open returns
5160 // if the specified oflag has the O_DELETE flag set.
5161 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5162
5163 int os::open(const char *path, int oflag, int mode) {
5164 if (strlen(path) > MAX_PATH - 1) {
5165 errno = ENAMETOOLONG;
5166 return -1;
5167 }
5168 int fd;
5169 int o_delete = (oflag & O_DELETE);
5170 oflag = oflag & ~O_DELETE;
5171
5172 fd = ::open64(path, oflag, mode);
5173 if (fd == -1) return -1;
5174
5175 //If the open succeeded, the file might still be a directory
5176 {
5177 struct stat64 buf64;
5178 int ret = ::fstat64(fd, &buf64);
5179 int st_mode = buf64.st_mode;
5180
5181 if (ret != -1) {
5182 if ((st_mode & S_IFMT) == S_IFDIR) {
5183 errno = EISDIR;
5184 ::close(fd);
5185 return -1;
5186 }
5187 } else {
5188 ::close(fd);
5189 return -1;
5190 }
5191 }
5192 /*
5193 * 32-bit Solaris systems suffer from:
5194 *
5195 * - an historical default soft limit of 256 per-process file
5196 * descriptors that is too low for many Java programs.
5197 *
5198 * - a design flaw where file descriptors created using stdio
5199 * fopen must be less than 256, _even_ when the first limit above
5200 * has been raised. This can cause calls to fopen (but not calls to
5201 * open, for example) to fail mysteriously, perhaps in 3rd party
5202 * native code (although the JDK itself uses fopen). One can hardly
5203 * criticize them for using this most standard of all functions.
5204 *
5205 * We attempt to make everything work anyways by:
5206 *
5207 * - raising the soft limit on per-process file descriptors beyond
5208 * 256
5209 *
5210 * - As of Solaris 10u4, we can request that Solaris raise the 256
5211 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5212 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5213 *
5214 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5215 * workaround the bug by remapping non-stdio file descriptors below
5216 * 256 to ones beyond 256, which is done below.
5217 *
5218 * See:
5219 * 1085341: 32-bit stdio routines should support file descriptors >255
5220 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5221 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5222 * enable_extended_FILE_stdio() in VM initialisation
5223 * Giri Mandalika's blog
5224 * http://technopark02.blogspot.com/2005_05_01_archive.html
5225 */
5226 #ifndef _LP64
5227 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5228 int newfd = ::fcntl(fd, F_DUPFD, 256);
5229 if (newfd != -1) {
5230 ::close(fd);
5231 fd = newfd;
5232 }
5233 }
5234 #endif // 32-bit Solaris
5235 /*
5236 * All file descriptors that are opened in the JVM and not
5237 * specifically destined for a subprocess should have the
5238 * close-on-exec flag set. If we don't set it, then careless 3rd
5239 * party native code might fork and exec without closing all
5240 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5241 * UNIXProcess.c), and this in turn might:
5242 *
5243 * - cause end-of-file to fail to be detected on some file
5244 * descriptors, resulting in mysterious hangs, or
5245 *
5246 * - might cause an fopen in the subprocess to fail on a system
5247 * suffering from bug 1085341.
5248 *
5249 * (Yes, the default setting of the close-on-exec flag is a Unix
5250 * design flaw)
5251 *
5252 * See:
5253 * 1085341: 32-bit stdio routines should support file descriptors >255
5254 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5255 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5256 */
5257 #ifdef FD_CLOEXEC
5258 {
5259 int flags = ::fcntl(fd, F_GETFD);
5260 if (flags != -1)
5261 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5262 }
5263 #endif
5264
5265 if (o_delete != 0) {
5266 ::unlink(path);
5267 }
5268 return fd;
5269 }
5270
5271 // create binary file, rewriting existing file if required
5272 int os::create_binary_file(const char* path, bool rewrite_existing) {
5273 int oflags = O_WRONLY | O_CREAT;
5274 if (!rewrite_existing) {
5275 oflags |= O_EXCL;
5276 }
5277 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5278 }
5279
5280 // return current position of file pointer
5281 jlong os::current_file_offset(int fd) {
5282 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5283 }
5284
5285 // move file pointer to the specified offset
5286 jlong os::seek_to_file_offset(int fd, jlong offset) {
5287 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5288 }
5289
5290 jlong os::lseek(int fd, jlong offset, int whence) {
5291 return (jlong) ::lseek64(fd, offset, whence);
5292 }
5293
5294 char * os::native_path(char *path) {
5295 return path;
5296 }
5297
5298 int os::ftruncate(int fd, jlong length) {
5299 return ::ftruncate64(fd, length);
5300 }
5301
5302 int os::fsync(int fd) {
5303 RESTARTABLE_RETURN_INT(::fsync(fd));
5304 }
5305
5306 int os::available(int fd, jlong *bytes) {
5307 jlong cur, end;
5308 int mode;
5309 struct stat64 buf64;
5310
5311 if (::fstat64(fd, &buf64) >= 0) {
5312 mode = buf64.st_mode;
5313 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5314 /*
5315 * XXX: is the following call interruptible? If so, this might
5316 * need to go through the INTERRUPT_IO() wrapper as for other
5317 * blocking, interruptible calls in this file.
5318 */
5319 int n,ioctl_return;
5320
5321 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5322 if (ioctl_return>= 0) {
5323 *bytes = n;
5324 return 1;
5325 }
5326 }
5327 }
5328 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5329 return 0;
5330 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5331 return 0;
5332 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5333 return 0;
5334 }
5335 *bytes = end - cur;
5336 return 1;
5337 }
5338
5339 // Map a block of memory.
5340 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5341 char *addr, size_t bytes, bool read_only,
5342 bool allow_exec) {
5343 int prot;
5344 int flags;
5345
5346 if (read_only) {
5347 prot = PROT_READ;
5348 flags = MAP_SHARED;
5349 } else {
5350 prot = PROT_READ | PROT_WRITE;
5351 flags = MAP_PRIVATE;
5352 }
5353
5354 if (allow_exec) {
5355 prot |= PROT_EXEC;
5356 }
5357
5358 if (addr != NULL) {
5359 flags |= MAP_FIXED;
5360 }
5361
5362 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5363 fd, file_offset);
5364 if (mapped_address == MAP_FAILED) {
5365 return NULL;
5366 }
5367 return mapped_address;
5368 }
5369
5370
5371 // Remap a block of memory.
5372 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5373 char *addr, size_t bytes, bool read_only,
5374 bool allow_exec) {
5375 // same as map_memory() on this OS
5376 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5377 allow_exec);
5378 }
5379
5380
5381 // Unmap a block of memory.
5382 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5383 return munmap(addr, bytes) == 0;
5384 }
5385
5386 void os::pause() {
5387 char filename[MAX_PATH];
5388 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5389 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5390 } else {
5391 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5392 }
5393
5394 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5395 if (fd != -1) {
5396 struct stat buf;
5397 ::close(fd);
5398 while (::stat(filename, &buf) == 0) {
5399 (void)::poll(NULL, 0, 100);
5400 }
5401 } else {
5402 jio_fprintf(stderr,
5403 "Could not open pause file '%s', continuing immediately.\n", filename);
5404 }
5405 }
5406
5407 #ifndef PRODUCT
5408 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5409 // Turn this on if you need to trace synch operations.
5410 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5411 // and call record_synch_enable and record_synch_disable
5412 // around the computation of interest.
5413
5414 void record_synch(char* name, bool returning); // defined below
5415
5416 class RecordSynch {
5417 char* _name;
5418 public:
5419 RecordSynch(char* name) :_name(name)
5420 { record_synch(_name, false); }
5421 ~RecordSynch() { record_synch(_name, true); }
5422 };
5423
5424 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5425 extern "C" ret name params { \
5426 typedef ret name##_t params; \
5427 static name##_t* implem = NULL; \
5428 static int callcount = 0; \
5429 if (implem == NULL) { \
5430 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5431 if (implem == NULL) fatal(dlerror()); \
5432 } \
5433 ++callcount; \
5434 RecordSynch _rs(#name); \
5435 inner; \
5436 return implem args; \
5437 }
5438 // in dbx, examine callcounts this way:
5439 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5440
5441 #define CHECK_POINTER_OK(p) \
5442 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5443 #define CHECK_MU \
5444 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5445 #define CHECK_CV \
5446 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5447 #define CHECK_P(p) \
5448 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5449
5450 #define CHECK_MUTEX(mutex_op) \
5451 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5452
5453 CHECK_MUTEX( mutex_lock)
5454 CHECK_MUTEX( _mutex_lock)
5455 CHECK_MUTEX( mutex_unlock)
5456 CHECK_MUTEX(_mutex_unlock)
5457 CHECK_MUTEX( mutex_trylock)
5458 CHECK_MUTEX(_mutex_trylock)
5459
5460 #define CHECK_COND(cond_op) \
5461 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5462
5463 CHECK_COND( cond_wait);
5464 CHECK_COND(_cond_wait);
5465 CHECK_COND(_cond_wait_cancel);
5466
5467 #define CHECK_COND2(cond_op) \
5468 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5469
5470 CHECK_COND2( cond_timedwait);
5471 CHECK_COND2(_cond_timedwait);
5472 CHECK_COND2(_cond_timedwait_cancel);
5473
5474 // do the _lwp_* versions too
5475 #define mutex_t lwp_mutex_t
5476 #define cond_t lwp_cond_t
5477 CHECK_MUTEX( _lwp_mutex_lock)
5478 CHECK_MUTEX( _lwp_mutex_unlock)
5479 CHECK_MUTEX( _lwp_mutex_trylock)
5480 CHECK_MUTEX( __lwp_mutex_lock)
5481 CHECK_MUTEX( __lwp_mutex_unlock)
5482 CHECK_MUTEX( __lwp_mutex_trylock)
5483 CHECK_MUTEX(___lwp_mutex_lock)
5484 CHECK_MUTEX(___lwp_mutex_unlock)
5485
5486 CHECK_COND( _lwp_cond_wait);
5487 CHECK_COND( __lwp_cond_wait);
5488 CHECK_COND(___lwp_cond_wait);
5489
5490 CHECK_COND2( _lwp_cond_timedwait);
5491 CHECK_COND2( __lwp_cond_timedwait);
5492 #undef mutex_t
5493 #undef cond_t
5494
5495 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5496 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5497 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5498 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5499 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5500 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5501 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5502 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5503
5504
5505 // recording machinery:
5506
5507 enum { RECORD_SYNCH_LIMIT = 200 };
5508 char* record_synch_name[RECORD_SYNCH_LIMIT];
5509 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5510 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5511 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5512 int record_synch_count = 0;
5513 bool record_synch_enabled = false;
5514
5515 // in dbx, examine recorded data this way:
5516 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5517
5518 void record_synch(char* name, bool returning) {
5519 if (record_synch_enabled) {
5520 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5521 record_synch_name[record_synch_count] = name;
5522 record_synch_returning[record_synch_count] = returning;
5523 record_synch_thread[record_synch_count] = thr_self();
5524 record_synch_arg0ptr[record_synch_count] = &name;
5525 record_synch_count++;
5526 }
5527 // put more checking code here:
5528 // ...
5529 }
5530 }
5531
5532 void record_synch_enable() {
5533 // start collecting trace data, if not already doing so
5534 if (!record_synch_enabled) record_synch_count = 0;
5535 record_synch_enabled = true;
5536 }
5537
5538 void record_synch_disable() {
5539 // stop collecting trace data
5540 record_synch_enabled = false;
5541 }
5542
5543 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5544 #endif // PRODUCT
5545
5546 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5547 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5548 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5549
5550
5551 // JVMTI & JVM monitoring and management support
5552 // The thread_cpu_time() and current_thread_cpu_time() are only
5553 // supported if is_thread_cpu_time_supported() returns true.
5554 // They are not supported on Solaris T1.
5555
5556 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5557 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5558 // of a thread.
5559 //
5560 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5561 // returns the fast estimate available on the platform.
5562
5563 // hrtime_t gethrvtime() return value includes
5564 // user time but does not include system time
5565 jlong os::current_thread_cpu_time() {
5566 return (jlong) gethrvtime();
5567 }
5568
5569 jlong os::thread_cpu_time(Thread *thread) {
5570 // return user level CPU time only to be consistent with
5571 // what current_thread_cpu_time returns.
5572 // thread_cpu_time_info() must be changed if this changes
5573 return os::thread_cpu_time(thread, false /* user time only */);
5574 }
5575
5576 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5577 if (user_sys_cpu_time) {
5578 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5579 } else {
5580 return os::current_thread_cpu_time();
5581 }
5582 }
5583
5584 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5585 char proc_name[64];
5586 int count;
5587 prusage_t prusage;
5588 jlong lwp_time;
5589 int fd;
5590
5591 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5592 getpid(),
5593 thread->osthread()->lwp_id());
5594 fd = ::open(proc_name, O_RDONLY);
5595 if ( fd == -1 ) return -1;
5596
5597 do {
5598 count = ::pread(fd,
5599 (void *)&prusage.pr_utime,
5600 thr_time_size,
5601 thr_time_off);
5602 } while (count < 0 && errno == EINTR);
5603 ::close(fd);
5604 if ( count < 0 ) return -1;
5605
5606 if (user_sys_cpu_time) {
5607 // user + system CPU time
5608 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5609 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5610 (jlong)prusage.pr_stime.tv_nsec +
5611 (jlong)prusage.pr_utime.tv_nsec;
5612 } else {
5613 // user level CPU time only
5614 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5615 (jlong)prusage.pr_utime.tv_nsec;
5616 }
5617
5618 return(lwp_time);
5619 }
5620
5621 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5622 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5623 info_ptr->may_skip_backward = false; // elapsed time not wall time
5624 info_ptr->may_skip_forward = false; // elapsed time not wall time
5625 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5626 }
5627
5628 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5629 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5630 info_ptr->may_skip_backward = false; // elapsed time not wall time
5631 info_ptr->may_skip_forward = false; // elapsed time not wall time
5632 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5633 }
5634
5635 bool os::is_thread_cpu_time_supported() {
5636 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5637 return true;
5638 } else {
5639 return false;
5640 }
5641 }
5642
5643 // System loadavg support. Returns -1 if load average cannot be obtained.
5644 // Return the load average for our processor set if the primitive exists
5645 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5646 int os::loadavg(double loadavg[], int nelem) {
5647 if (pset_getloadavg_ptr != NULL) {
5648 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5649 } else {
5650 return ::getloadavg(loadavg, nelem);
5651 }
5652 }
5653
5654 //---------------------------------------------------------------------------------
5655
5656 bool os::find(address addr, outputStream* st) {
5657 Dl_info dlinfo;
5658 memset(&dlinfo, 0, sizeof(dlinfo));
5659 if (dladdr(addr, &dlinfo) != 0) {
5660 st->print(PTR_FORMAT ": ", addr);
5661 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5662 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5663 } else if (dlinfo.dli_fbase != NULL)
5664 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5665 else
5666 st->print("<absolute address>");
5667 if (dlinfo.dli_fname != NULL) {
5668 st->print(" in %s", dlinfo.dli_fname);
5669 }
5670 if (dlinfo.dli_fbase != NULL) {
5671 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5672 }
5673 st->cr();
5674
5675 if (Verbose) {
5676 // decode some bytes around the PC
5677 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5678 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5679 address lowest = (address) dlinfo.dli_sname;
5680 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5681 if (begin < lowest) begin = lowest;
5682 Dl_info dlinfo2;
5683 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5684 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5685 end = (address) dlinfo2.dli_saddr;
5686 Disassembler::decode(begin, end, st);
5687 }
5688 return true;
5689 }
5690 return false;
5691 }
5692
5693 // Following function has been added to support HotSparc's libjvm.so running
5694 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5695 // src/solaris/hpi/native_threads in the EVM codebase.
5696 //
5697 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5698 // libraries and should thus be removed. We will leave it behind for a while
5699 // until we no longer want to able to run on top of 1.3.0 Solaris production
5700 // JDK. See 4341971.
5701
5702 #define STACK_SLACK 0x800
5703
5704 extern "C" {
5705 intptr_t sysThreadAvailableStackWithSlack() {
5706 stack_t st;
5707 intptr_t retval, stack_top;
5708 retval = thr_stksegment(&st);
5709 assert(retval == 0, "incorrect return value from thr_stksegment");
5710 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5711 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5712 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5713 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5714 }
5715 }
5716
5717 // ObjectMonitor park-unpark infrastructure ...
5718 //
5719 // We implement Solaris and Linux PlatformEvents with the
5720 // obvious condvar-mutex-flag triple.
5721 // Another alternative that works quite well is pipes:
5722 // Each PlatformEvent consists of a pipe-pair.
5723 // The thread associated with the PlatformEvent
5724 // calls park(), which reads from the input end of the pipe.
5725 // Unpark() writes into the other end of the pipe.
5726 // The write-side of the pipe must be set NDELAY.
5727 // Unfortunately pipes consume a large # of handles.
5728 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5729 // Using pipes for the 1st few threads might be workable, however.
5730 //
5731 // park() is permitted to return spuriously.
5732 // Callers of park() should wrap the call to park() in
5733 // an appropriate loop. A litmus test for the correct
5734 // usage of park is the following: if park() were modified
5735 // to immediately return 0 your code should still work,
5736 // albeit degenerating to a spin loop.
5737 //
5738 // An interesting optimization for park() is to use a trylock()
5739 // to attempt to acquire the mutex. If the trylock() fails
5740 // then we know that a concurrent unpark() operation is in-progress.
5741 // in that case the park() code could simply set _count to 0
5742 // and return immediately. The subsequent park() operation *might*
5743 // return immediately. That's harmless as the caller of park() is
5744 // expected to loop. By using trylock() we will have avoided a
5745 // avoided a context switch caused by contention on the per-thread mutex.
5746 //
5747 // TODO-FIXME:
5748 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5749 // objectmonitor implementation.
5750 // 2. Collapse the JSR166 parker event, and the
5751 // objectmonitor ParkEvent into a single "Event" construct.
5752 // 3. In park() and unpark() add:
5753 // assert (Thread::current() == AssociatedWith).
5754 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5755 // 1-out-of-N park() operations will return immediately.
5756 //
5757 // _Event transitions in park()
5758 // -1 => -1 : illegal
5759 // 1 => 0 : pass - return immediately
5760 // 0 => -1 : block
5761 //
5762 // _Event serves as a restricted-range semaphore.
5763 //
5764 // Another possible encoding of _Event would be with
5765 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5766 //
5767 // TODO-FIXME: add DTRACE probes for:
5768 // 1. Tx parks
5769 // 2. Ty unparks Tx
5770 // 3. Tx resumes from park
5771
5772
5773 // value determined through experimentation
5774 #define ROUNDINGFIX 11
5775
5776 // utility to compute the abstime argument to timedwait.
5777 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5778
5779 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5780 // millis is the relative timeout time
5781 // abstime will be the absolute timeout time
5782 if (millis < 0) millis = 0;
5783 struct timeval now;
5784 int status = gettimeofday(&now, NULL);
5785 assert(status == 0, "gettimeofday");
5786 jlong seconds = millis / 1000;
5787 jlong max_wait_period;
5788
5789 if (UseLWPSynchronization) {
5790 // forward port of fix for 4275818 (not sleeping long enough)
5791 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5792 // _lwp_cond_timedwait() used a round_down algorithm rather
5793 // than a round_up. For millis less than our roundfactor
5794 // it rounded down to 0 which doesn't meet the spec.
5795 // For millis > roundfactor we may return a bit sooner, but
5796 // since we can not accurately identify the patch level and
5797 // this has already been fixed in Solaris 9 and 8 we will
5798 // leave it alone rather than always rounding down.
5799
5800 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5801 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5802 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5803 max_wait_period = 21000000;
5804 } else {
5805 max_wait_period = 50000000;
5806 }
5807 millis %= 1000;
5808 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5809 seconds = max_wait_period;
5810 }
5811 abstime->tv_sec = now.tv_sec + seconds;
5812 long usec = now.tv_usec + millis * 1000;
5813 if (usec >= 1000000) {
5814 abstime->tv_sec += 1;
5815 usec -= 1000000;
5816 }
5817 abstime->tv_nsec = usec * 1000;
5818 return abstime;
5819 }
5820
5821 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5822 // Conceptually TryPark() should be equivalent to park(0).
5823
5824 int os::PlatformEvent::TryPark() {
5825 for (;;) {
5826 const int v = _Event ;
5827 guarantee ((v == 0) || (v == 1), "invariant") ;
5828 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5829 }
5830 }
5831
5832 void os::PlatformEvent::park() { // AKA: down()
5833 // Invariant: Only the thread associated with the Event/PlatformEvent
5834 // may call park().
5835 int v ;
5836 for (;;) {
5837 v = _Event ;
5838 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5839 }
5840 guarantee (v >= 0, "invariant") ;
5841 if (v == 0) {
5842 // Do this the hard way by blocking ...
5843 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5844 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5845 // Only for SPARC >= V8PlusA
5846 #if defined(__sparc) && defined(COMPILER2)
5847 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5848 #endif
5849 int status = os::Solaris::mutex_lock(_mutex);
5850 assert_status(status == 0, status, "mutex_lock");
5851 guarantee (_nParked == 0, "invariant") ;
5852 ++ _nParked ;
5853 while (_Event < 0) {
5854 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5855 // Treat this the same as if the wait was interrupted
5856 // With usr/lib/lwp going to kernel, always handle ETIME
5857 status = os::Solaris::cond_wait(_cond, _mutex);
5858 if (status == ETIME) status = EINTR ;
5859 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5860 }
5861 -- _nParked ;
5862 _Event = 0 ;
5863 status = os::Solaris::mutex_unlock(_mutex);
5864 assert_status(status == 0, status, "mutex_unlock");
5865 // Paranoia to ensure our locked and lock-free paths interact
5866 // correctly with each other.
5867 OrderAccess::fence();
5868 }
5869 }
5870
5871 int os::PlatformEvent::park(jlong millis) {
5872 guarantee (_nParked == 0, "invariant") ;
5873 int v ;
5874 for (;;) {
5875 v = _Event ;
5876 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5877 }
5878 guarantee (v >= 0, "invariant") ;
5879 if (v != 0) return OS_OK ;
5880
5881 int ret = OS_TIMEOUT;
5882 timestruc_t abst;
5883 compute_abstime (&abst, millis);
5884
5885 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5886 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5887 // Only for SPARC >= V8PlusA
5888 #if defined(__sparc) && defined(COMPILER2)
5889 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5890 #endif
5891 int status = os::Solaris::mutex_lock(_mutex);
5892 assert_status(status == 0, status, "mutex_lock");
5893 guarantee (_nParked == 0, "invariant") ;
5894 ++ _nParked ;
5895 while (_Event < 0) {
5896 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5897 assert_status(status == 0 || status == EINTR ||
5898 status == ETIME || status == ETIMEDOUT,
5899 status, "cond_timedwait");
5900 if (!FilterSpuriousWakeups) break ; // previous semantics
5901 if (status == ETIME || status == ETIMEDOUT) break ;
5902 // We consume and ignore EINTR and spurious wakeups.
5903 }
5904 -- _nParked ;
5905 if (_Event >= 0) ret = OS_OK ;
5906 _Event = 0 ;
5907 status = os::Solaris::mutex_unlock(_mutex);
5908 assert_status(status == 0, status, "mutex_unlock");
5909 // Paranoia to ensure our locked and lock-free paths interact
5910 // correctly with each other.
5911 OrderAccess::fence();
5912 return ret;
5913 }
5914
5915 void os::PlatformEvent::unpark() {
5916 // Transitions for _Event:
5917 // 0 :=> 1
5918 // 1 :=> 1
5919 // -1 :=> either 0 or 1; must signal target thread
5920 // That is, we can safely transition _Event from -1 to either
5921 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
5922 // unpark() calls.
5923 // See also: "Semaphores in Plan 9" by Mullender & Cox
5924 //
5925 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5926 // that it will take two back-to-back park() calls for the owning
5927 // thread to block. This has the benefit of forcing a spurious return
5928 // from the first park() call after an unpark() call which will help
5929 // shake out uses of park() and unpark() without condition variables.
5930
5931 if (Atomic::xchg(1, &_Event) >= 0) return;
5932
5933 // If the thread associated with the event was parked, wake it.
5934 // Wait for the thread assoc with the PlatformEvent to vacate.
5935 int status = os::Solaris::mutex_lock(_mutex);
5936 assert_status(status == 0, status, "mutex_lock");
5937 int AnyWaiters = _nParked;
5938 status = os::Solaris::mutex_unlock(_mutex);
5939 assert_status(status == 0, status, "mutex_unlock");
5940 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5941 if (AnyWaiters != 0) {
5942 // We intentional signal *after* dropping the lock
5943 // to avoid a common class of futile wakeups.
5944 status = os::Solaris::cond_signal(_cond);
5945 assert_status(status == 0, status, "cond_signal");
5946 }
5947 }
5948
5949 // JSR166
5950 // -------------------------------------------------------
5951
5952 /*
5953 * The solaris and linux implementations of park/unpark are fairly
5954 * conservative for now, but can be improved. They currently use a
5955 * mutex/condvar pair, plus _counter.
5956 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5957 * sets count to 1 and signals condvar. Only one thread ever waits
5958 * on the condvar. Contention seen when trying to park implies that someone
5959 * is unparking you, so don't wait. And spurious returns are fine, so there
5960 * is no need to track notifications.
5961 */
5962
5963 #define MAX_SECS 100000000
5964 /*
5965 * This code is common to linux and solaris and will be moved to a
5966 * common place in dolphin.
5967 *
5968 * The passed in time value is either a relative time in nanoseconds
5969 * or an absolute time in milliseconds. Either way it has to be unpacked
5970 * into suitable seconds and nanoseconds components and stored in the
5971 * given timespec structure.
5972 * Given time is a 64-bit value and the time_t used in the timespec is only
5973 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5974 * overflow if times way in the future are given. Further on Solaris versions
5975 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5976 * number of seconds, in abstime, is less than current_time + 100,000,000.
5977 * As it will be 28 years before "now + 100000000" will overflow we can
5978 * ignore overflow and just impose a hard-limit on seconds using the value
5979 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5980 * years from "now".
5981 */
5982 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5983 assert (time > 0, "convertTime");
5984
5985 struct timeval now;
5986 int status = gettimeofday(&now, NULL);
5987 assert(status == 0, "gettimeofday");
5988
5989 time_t max_secs = now.tv_sec + MAX_SECS;
5990
5991 if (isAbsolute) {
5992 jlong secs = time / 1000;
5993 if (secs > max_secs) {
5994 absTime->tv_sec = max_secs;
5995 }
5996 else {
5997 absTime->tv_sec = secs;
5998 }
5999 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
6000 }
6001 else {
6002 jlong secs = time / NANOSECS_PER_SEC;
6003 if (secs >= MAX_SECS) {
6004 absTime->tv_sec = max_secs;
6005 absTime->tv_nsec = 0;
6006 }
6007 else {
6008 absTime->tv_sec = now.tv_sec + secs;
6009 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6010 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6011 absTime->tv_nsec -= NANOSECS_PER_SEC;
6012 ++absTime->tv_sec; // note: this must be <= max_secs
6013 }
6014 }
6015 }
6016 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6017 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6018 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6019 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6020 }
6021
6022 void Parker::park(bool isAbsolute, jlong time) {
6023 // Ideally we'd do something useful while spinning, such
6024 // as calling unpackTime().
6025
6026 // Optional fast-path check:
6027 // Return immediately if a permit is available.
6028 // We depend on Atomic::xchg() having full barrier semantics
6029 // since we are doing a lock-free update to _counter.
6030 if (Atomic::xchg(0, &_counter) > 0) return;
6031
6032 // Optional fast-exit: Check interrupt before trying to wait
6033 Thread* thread = Thread::current();
6034 assert(thread->is_Java_thread(), "Must be JavaThread");
6035 JavaThread *jt = (JavaThread *)thread;
6036 if (Thread::is_interrupted(thread, false)) {
6037 return;
6038 }
6039
6040 // First, demultiplex/decode time arguments
6041 timespec absTime;
6042 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6043 return;
6044 }
6045 if (time > 0) {
6046 // Warning: this code might be exposed to the old Solaris time
6047 // round-down bugs. Grep "roundingFix" for details.
6048 unpackTime(&absTime, isAbsolute, time);
6049 }
6050
6051 // Enter safepoint region
6052 // Beware of deadlocks such as 6317397.
6053 // The per-thread Parker:: _mutex is a classic leaf-lock.
6054 // In particular a thread must never block on the Threads_lock while
6055 // holding the Parker:: mutex. If safepoints are pending both the
6056 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6057 ThreadBlockInVM tbivm(jt);
6058
6059 // Don't wait if cannot get lock since interference arises from
6060 // unblocking. Also. check interrupt before trying wait
6061 if (Thread::is_interrupted(thread, false) ||
6062 os::Solaris::mutex_trylock(_mutex) != 0) {
6063 return;
6064 }
6065
6066 int status ;
6067
6068 if (_counter > 0) { // no wait needed
6069 _counter = 0;
6070 status = os::Solaris::mutex_unlock(_mutex);
6071 assert (status == 0, "invariant") ;
6072 // Paranoia to ensure our locked and lock-free paths interact
6073 // correctly with each other and Java-level accesses.
6074 OrderAccess::fence();
6075 return;
6076 }
6077
6078 #ifdef ASSERT
6079 // Don't catch signals while blocked; let the running threads have the signals.
6080 // (This allows a debugger to break into the running thread.)
6081 sigset_t oldsigs;
6082 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6083 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6084 #endif
6085
6086 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6087 jt->set_suspend_equivalent();
6088 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6089
6090 // Do this the hard way by blocking ...
6091 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6092 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6093 // Only for SPARC >= V8PlusA
6094 #if defined(__sparc) && defined(COMPILER2)
6095 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6096 #endif
6097
6098 if (time == 0) {
6099 status = os::Solaris::cond_wait (_cond, _mutex) ;
6100 } else {
6101 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6102 }
6103 // Note that an untimed cond_wait() can sometimes return ETIME on older
6104 // versions of the Solaris.
6105 assert_status(status == 0 || status == EINTR ||
6106 status == ETIME || status == ETIMEDOUT,
6107 status, "cond_timedwait");
6108
6109 #ifdef ASSERT
6110 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6111 #endif
6112 _counter = 0 ;
6113 status = os::Solaris::mutex_unlock(_mutex);
6114 assert_status(status == 0, status, "mutex_unlock") ;
6115 // Paranoia to ensure our locked and lock-free paths interact
6116 // correctly with each other and Java-level accesses.
6117 OrderAccess::fence();
6118
6119 // If externally suspended while waiting, re-suspend
6120 if (jt->handle_special_suspend_equivalent_condition()) {
6121 jt->java_suspend_self();
6122 }
6123 }
6124
6125 void Parker::unpark() {
6126 int s, status ;
6127 status = os::Solaris::mutex_lock (_mutex) ;
6128 assert (status == 0, "invariant") ;
6129 s = _counter;
6130 _counter = 1;
6131 status = os::Solaris::mutex_unlock (_mutex) ;
6132 assert (status == 0, "invariant") ;
6133
6134 if (s < 1) {
6135 status = os::Solaris::cond_signal (_cond) ;
6136 assert (status == 0, "invariant") ;
6137 }
6138 }
6139
6140 extern char** environ;
6141
6142 // Run the specified command in a separate process. Return its exit value,
6143 // or -1 on failure (e.g. can't fork a new process).
6144 // Unlike system(), this function can be called from signal handler. It
6145 // doesn't block SIGINT et al.
6146 int os::fork_and_exec(char* cmd) {
6147 char * argv[4];
6148 argv[0] = (char *)"sh";
6149 argv[1] = (char *)"-c";
6150 argv[2] = cmd;
6151 argv[3] = NULL;
6152
6153 // fork is async-safe, fork1 is not so can't use in signal handler
6154 pid_t pid;
6155 Thread* t = ThreadLocalStorage::get_thread_slow();
6156 if (t != NULL && t->is_inside_signal_handler()) {
6157 pid = fork();
6158 } else {
6159 pid = fork1();
6160 }
6161
6162 if (pid < 0) {
6163 // fork failed
6164 warning("fork failed: %s", strerror(errno));
6165 return -1;
6166
6167 } else if (pid == 0) {
6168 // child process
6169
6170 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6171 execve("/usr/bin/sh", argv, environ);
6172
6173 // execve failed
6174 _exit(-1);
6175
6176 } else {
6177 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6178 // care about the actual exit code, for now.
6179
6180 int status;
6181
6182 // Wait for the child process to exit. This returns immediately if
6183 // the child has already exited. */
6184 while (waitpid(pid, &status, 0) < 0) {
6185 switch (errno) {
6186 case ECHILD: return 0;
6187 case EINTR: break;
6188 default: return -1;
6189 }
6190 }
6191
6192 if (WIFEXITED(status)) {
6193 // The child exited normally; get its exit code.
6194 return WEXITSTATUS(status);
6195 } else if (WIFSIGNALED(status)) {
6196 // The child exited because of a signal
6197 // The best value to return is 0x80 + signal number,
6198 // because that is what all Unix shells do, and because
6199 // it allows callers to distinguish between process exit and
6200 // process death by signal.
6201 return 0x80 + WTERMSIG(status);
6202 } else {
6203 // Unknown exit code; pass it through
6204 return status;
6205 }
6206 }
6207 }
6208
6209 // is_headless_jre()
6210 //
6211 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6212 // in order to report if we are running in a headless jre
6213 //
6214 // Since JDK8 xawt/libmawt.so was moved into the same directory
6215 // as libawt.so, and renamed libawt_xawt.so
6216 //
6217 bool os::is_headless_jre() {
6218 struct stat statbuf;
6219 char buf[MAXPATHLEN];
6220 char libmawtpath[MAXPATHLEN];
6221 const char *xawtstr = "/xawt/libmawt.so";
6222 const char *new_xawtstr = "/libawt_xawt.so";
6223 char *p;
6224
6225 // Get path to libjvm.so
6226 os::jvm_path(buf, sizeof(buf));
6227
6228 // Get rid of libjvm.so
6229 p = strrchr(buf, '/');
6230 if (p == NULL) return false;
6231 else *p = '\0';
6232
6233 // Get rid of client or server
6234 p = strrchr(buf, '/');
6235 if (p == NULL) return false;
6236 else *p = '\0';
6237
6238 // check xawt/libmawt.so
6239 strcpy(libmawtpath, buf);
6240 strcat(libmawtpath, xawtstr);
6241 if (::stat(libmawtpath, &statbuf) == 0) return false;
6242
6243 // check libawt_xawt.so
6244 strcpy(libmawtpath, buf);
6245 strcat(libmawtpath, new_xawtstr);
6246 if (::stat(libmawtpath, &statbuf) == 0) return false;
6247
6248 return true;
6249 }
6250
6251 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6252 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6253 }
6254
6255 int os::close(int fd) {
6256 return ::close(fd);
6257 }
6258
6259 int os::socket_close(int fd) {
6260 return ::close(fd);
6261 }
6262
6263 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6264 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6265 }
6266
6267 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6268 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6269 }
6270
6271 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6272 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6273 }
6274
6275 // As both poll and select can be interrupted by signals, we have to be
6276 // prepared to restart the system call after updating the timeout, unless
6277 // a poll() is done with timeout == -1, in which case we repeat with this
6278 // "wait forever" value.
6279
6280 int os::timeout(int fd, long timeout) {
6281 int res;
6282 struct timeval t;
6283 julong prevtime, newtime;
6284 static const char* aNull = 0;
6285 struct pollfd pfd;
6286 pfd.fd = fd;
6287 pfd.events = POLLIN;
6288
6289 gettimeofday(&t, &aNull);
6290 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6291
6292 for(;;) {
6293 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6294 if(res == OS_ERR && errno == EINTR) {
6295 if(timeout != -1) {
6296 gettimeofday(&t, &aNull);
6297 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6298 timeout -= newtime - prevtime;
6299 if(timeout <= 0)
6300 return OS_OK;
6301 prevtime = newtime;
6302 }
6303 } else return res;
6304 }
6305 }
6306
6307 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6308 int _result;
6309 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6310 os::Solaris::clear_interrupted);
6311
6312 // Depending on when thread interruption is reset, _result could be
6313 // one of two values when errno == EINTR
6314
6315 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6316 && (errno == EINTR)) {
6317 /* restarting a connect() changes its errno semantics */
6318 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6319 os::Solaris::clear_interrupted);
6320 /* undo these changes */
6321 if (_result == OS_ERR) {
6322 if (errno == EALREADY) {
6323 errno = EINPROGRESS; /* fall through */
6324 } else if (errno == EISCONN) {
6325 errno = 0;
6326 return OS_OK;
6327 }
6328 }
6329 }
6330 return _result;
6331 }
6332
6333 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6334 if (fd < 0) {
6335 return OS_ERR;
6336 }
6337 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6338 os::Solaris::clear_interrupted);
6339 }
6340
6341 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6342 sockaddr* from, socklen_t* fromlen) {
6343 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6344 os::Solaris::clear_interrupted);
6345 }
6346
6347 int os::sendto(int fd, char* buf, size_t len, uint flags,
6348 struct sockaddr* to, socklen_t tolen) {
6349 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6350 os::Solaris::clear_interrupted);
6351 }
6352
6353 int os::socket_available(int fd, jint *pbytes) {
6354 if (fd < 0) {
6355 return OS_OK;
6356 }
6357 int ret;
6358 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6359 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6360 // is expected to return 0 on failure and 1 on success to the jdk.
6361 return (ret == OS_ERR) ? 0 : 1;
6362 }
6363
6364 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6365 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6366 os::Solaris::clear_interrupted);
6367 }
6368
6369 // Get the default path to the core file
6370 // Returns the length of the string
6371 int os::get_core_path(char* buffer, size_t bufferSize) {
6372 const char* p = get_current_directory(buffer, bufferSize);
6373
6374 if (p == NULL) {
6375 assert(p != NULL, "failed to get current directory");
6376 return 0;
6377 }
6378
6379 return strlen(buffer);
6380 }
6381
6382 #ifndef PRODUCT
6383 void TestReserveMemorySpecial_test() {
6384 // No tests available for this platform
6385 }
6386 #endif