1 /*
2 * Copyright (c) 1997, 2015, 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 address os::current_stack_base() {
204 int r = thr_main() ;
205 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
206 bool is_primordial_thread = r;
207
208 // Workaround 4352906, avoid calls to thr_stksegment by
209 // thr_main after the first one (it looks like we trash
210 // some data, causing the value for ss_sp to be incorrect).
211 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
212 stack_t st = get_stack_info();
213 if (is_primordial_thread) {
214 // cache initial value of stack base
215 os::Solaris::_main_stack_base = (address)st.ss_sp;
216 }
217 return (address)st.ss_sp;
218 } else {
219 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
220 return os::Solaris::_main_stack_base;
221 }
222 }
223
224 size_t os::current_stack_size() {
225 size_t size;
226
227 int r = thr_main() ;
228 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
229 if(!r) {
230 size = get_stack_info().ss_size;
231 } else {
232 struct rlimit limits;
233 getrlimit(RLIMIT_STACK, &limits);
234 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
235 }
236 // base may not be page aligned
237 address base = current_stack_base();
238 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
239 return (size_t)(base - bottom);
240 }
241
242 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
243 return localtime_r(clock, res);
244 }
245
246 // interruptible infrastructure
247
248 // setup_interruptible saves the thread state before going into an
249 // interruptible system call.
250 // The saved state is used to restore the thread to
251 // its former state whether or not an interrupt is received.
252 // Used by classloader os::read
253 // os::restartable_read calls skip this layer and stay in _thread_in_native
254
255 void os::Solaris::setup_interruptible(JavaThread* thread) {
256
257 JavaThreadState thread_state = thread->thread_state();
258
259 assert(thread_state != _thread_blocked, "Coming from the wrong thread");
260 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible");
261 OSThread* osthread = thread->osthread();
262 osthread->set_saved_interrupt_thread_state(thread_state);
263 thread->frame_anchor()->make_walkable(thread);
264 ThreadStateTransition::transition(thread, thread_state, _thread_blocked);
265 }
266
267 // Version of setup_interruptible() for threads that are already in
268 // _thread_blocked. Used by os_sleep().
269 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) {
270 thread->frame_anchor()->make_walkable(thread);
271 }
272
273 JavaThread* os::Solaris::setup_interruptible() {
274 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
275 setup_interruptible(thread);
276 return thread;
277 }
278
279 void os::Solaris::try_enable_extended_io() {
280 typedef int (*enable_extended_FILE_stdio_t)(int, int);
281
282 if (!UseExtendedFileIO) {
283 return;
284 }
285
286 enable_extended_FILE_stdio_t enabler =
287 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
288 "enable_extended_FILE_stdio");
289 if (enabler) {
290 enabler(-1, -1);
291 }
292 }
293
294
295 #ifdef ASSERT
296
297 JavaThread* os::Solaris::setup_interruptible_native() {
298 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();
299 JavaThreadState thread_state = thread->thread_state();
300 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
301 return thread;
302 }
303
304 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) {
305 JavaThreadState thread_state = thread->thread_state();
306 assert(thread_state == _thread_in_native, "Assumed thread_in_native");
307 }
308 #endif
309
310 // cleanup_interruptible reverses the effects of setup_interruptible
311 // setup_interruptible_already_blocked() does not need any cleanup.
312
313 void os::Solaris::cleanup_interruptible(JavaThread* thread) {
314 OSThread* osthread = thread->osthread();
315
316 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state());
317 }
318
319 // I/O interruption related counters called in _INTERRUPTIBLE
320
321 void os::Solaris::bump_interrupted_before_count() {
322 RuntimeService::record_interrupted_before_count();
323 }
324
325 void os::Solaris::bump_interrupted_during_count() {
326 RuntimeService::record_interrupted_during_count();
327 }
328
329 static int _processors_online = 0;
330
331 jint os::Solaris::_os_thread_limit = 0;
332 volatile jint os::Solaris::_os_thread_count = 0;
333
334 julong os::available_memory() {
335 return Solaris::available_memory();
336 }
337
338 julong os::Solaris::available_memory() {
339 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
340 }
341
342 julong os::Solaris::_physical_memory = 0;
343
344 julong os::physical_memory() {
345 return Solaris::physical_memory();
346 }
347
348 static hrtime_t first_hrtime = 0;
349 static const hrtime_t hrtime_hz = 1000*1000*1000;
350 static volatile hrtime_t max_hrtime = 0;
351
352
353 void os::Solaris::initialize_system_info() {
354 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
355 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
356 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
357 }
358
359 int os::active_processor_count() {
360 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
361 pid_t pid = getpid();
362 psetid_t pset = PS_NONE;
363 // Are we running in a processor set or is there any processor set around?
364 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
365 uint_t pset_cpus;
366 // Query the number of cpus available to us.
367 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
368 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
369 _processors_online = pset_cpus;
370 return pset_cpus;
371 }
372 }
373 // Otherwise return number of online cpus
374 return online_cpus;
375 }
376
377 static bool find_processors_in_pset(psetid_t pset,
378 processorid_t** id_array,
379 uint_t* id_length) {
380 bool result = false;
381 // Find the number of processors in the processor set.
382 if (pset_info(pset, NULL, id_length, NULL) == 0) {
383 // Make up an array to hold their ids.
384 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
385 // Fill in the array with their processor ids.
386 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
387 result = true;
388 }
389 }
390 return result;
391 }
392
393 // Callers of find_processors_online() must tolerate imprecise results --
394 // the system configuration can change asynchronously because of DR
395 // or explicit psradm operations.
396 //
397 // We also need to take care that the loop (below) terminates as the
398 // number of processors online can change between the _SC_NPROCESSORS_ONLN
399 // request and the loop that builds the list of processor ids. Unfortunately
400 // there's no reliable way to determine the maximum valid processor id,
401 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
402 // man pages, which claim the processor id set is "sparse, but
403 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
404 // exit the loop.
405 //
406 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
407 // not available on S8.0.
408
409 static bool find_processors_online(processorid_t** id_array,
410 uint* id_length) {
411 const processorid_t MAX_PROCESSOR_ID = 100000 ;
412 // Find the number of processors online.
413 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
414 // Make up an array to hold their ids.
415 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
416 // Processors need not be numbered consecutively.
417 long found = 0;
418 processorid_t next = 0;
419 while (found < *id_length && next < MAX_PROCESSOR_ID) {
420 processor_info_t info;
421 if (processor_info(next, &info) == 0) {
422 // NB, PI_NOINTR processors are effectively online ...
423 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
424 (*id_array)[found] = next;
425 found += 1;
426 }
427 }
428 next += 1;
429 }
430 if (found < *id_length) {
431 // The loop above didn't identify the expected number of processors.
432 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
433 // and re-running the loop, above, but there's no guarantee of progress
434 // if the system configuration is in flux. Instead, we just return what
435 // we've got. Note that in the worst case find_processors_online() could
436 // return an empty set. (As a fall-back in the case of the empty set we
437 // could just return the ID of the current processor).
438 *id_length = found ;
439 }
440
441 return true;
442 }
443
444 static bool assign_distribution(processorid_t* id_array,
445 uint id_length,
446 uint* distribution,
447 uint distribution_length) {
448 // We assume we can assign processorid_t's to uint's.
449 assert(sizeof(processorid_t) == sizeof(uint),
450 "can't convert processorid_t to uint");
451 // Quick check to see if we won't succeed.
452 if (id_length < distribution_length) {
453 return false;
454 }
455 // Assign processor ids to the distribution.
456 // Try to shuffle processors to distribute work across boards,
457 // assuming 4 processors per board.
458 const uint processors_per_board = ProcessDistributionStride;
459 // Find the maximum processor id.
460 processorid_t max_id = 0;
461 for (uint m = 0; m < id_length; m += 1) {
462 max_id = MAX2(max_id, id_array[m]);
463 }
464 // The next id, to limit loops.
465 const processorid_t limit_id = max_id + 1;
466 // Make up markers for available processors.
467 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
468 for (uint c = 0; c < limit_id; c += 1) {
469 available_id[c] = false;
470 }
471 for (uint a = 0; a < id_length; a += 1) {
472 available_id[id_array[a]] = true;
473 }
474 // Step by "boards", then by "slot", copying to "assigned".
475 // NEEDS_CLEANUP: The assignment of processors should be stateful,
476 // remembering which processors have been assigned by
477 // previous calls, etc., so as to distribute several
478 // independent calls of this method. What we'd like is
479 // It would be nice to have an API that let us ask
480 // how many processes are bound to a processor,
481 // but we don't have that, either.
482 // In the short term, "board" is static so that
483 // subsequent distributions don't all start at board 0.
484 static uint board = 0;
485 uint assigned = 0;
486 // Until we've found enough processors ....
487 while (assigned < distribution_length) {
488 // ... find the next available processor in the board.
489 for (uint slot = 0; slot < processors_per_board; slot += 1) {
490 uint try_id = board * processors_per_board + slot;
491 if ((try_id < limit_id) && (available_id[try_id] == true)) {
492 distribution[assigned] = try_id;
493 available_id[try_id] = false;
494 assigned += 1;
495 break;
496 }
497 }
498 board += 1;
499 if (board * processors_per_board + 0 >= limit_id) {
500 board = 0;
501 }
502 }
503 if (available_id != NULL) {
504 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
505 }
506 return true;
507 }
508
509 void os::set_native_thread_name(const char *name) {
510 // Not yet implemented.
511 return;
512 }
513
514 bool os::distribute_processes(uint length, uint* distribution) {
515 bool result = false;
516 // Find the processor id's of all the available CPUs.
517 processorid_t* id_array = NULL;
518 uint id_length = 0;
519 // There are some races between querying information and using it,
520 // since processor sets can change dynamically.
521 psetid_t pset = PS_NONE;
522 // Are we running in a processor set?
523 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
524 result = find_processors_in_pset(pset, &id_array, &id_length);
525 } else {
526 result = find_processors_online(&id_array, &id_length);
527 }
528 if (result == true) {
529 if (id_length >= length) {
530 result = assign_distribution(id_array, id_length, distribution, length);
531 } else {
532 result = false;
533 }
534 }
535 if (id_array != NULL) {
536 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
537 }
538 return result;
539 }
540
541 bool os::bind_to_processor(uint processor_id) {
542 // We assume that a processorid_t can be stored in a uint.
543 assert(sizeof(uint) == sizeof(processorid_t),
544 "can't convert uint to processorid_t");
545 int bind_result =
546 processor_bind(P_LWPID, // bind LWP.
547 P_MYID, // bind current LWP.
548 (processorid_t) processor_id, // id.
549 NULL); // don't return old binding.
550 return (bind_result == 0);
551 }
552
553 bool os::getenv(const char* name, char* buffer, int len) {
554 char* val = ::getenv( name );
555 if ( val == NULL
556 || strlen(val) + 1 > len ) {
557 if (len > 0) buffer[0] = 0; // return a null string
558 return false;
559 }
560 strcpy( buffer, val );
561 return true;
562 }
563
564
565 // Return true if user is running as root.
566
567 bool os::have_special_privileges() {
568 static bool init = false;
569 static bool privileges = false;
570 if (!init) {
571 privileges = (getuid() != geteuid()) || (getgid() != getegid());
572 init = true;
573 }
574 return privileges;
575 }
576
577
578 void os::init_system_properties_values() {
579 // The next steps are taken in the product version:
580 //
581 // Obtain the JAVA_HOME value from the location of libjvm.so.
582 // This library should be located at:
583 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
584 //
585 // If "/jre/lib/" appears at the right place in the path, then we
586 // assume libjvm.so is installed in a JDK and we use this path.
587 //
588 // Otherwise exit with message: "Could not create the Java virtual machine."
589 //
590 // The following extra steps are taken in the debugging version:
591 //
592 // If "/jre/lib/" does NOT appear at the right place in the path
593 // instead of exit check for $JAVA_HOME environment variable.
594 //
595 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
596 // then we append a fake suffix "hotspot/libjvm.so" to this path so
597 // it looks like libjvm.so is installed there
598 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
599 //
600 // Otherwise exit.
601 //
602 // Important note: if the location of libjvm.so changes this
603 // code needs to be changed accordingly.
604
605 // Base path of extensions installed on the system.
606 #define SYS_EXT_DIR "/usr/jdk/packages"
607 #define EXTENSIONS_DIR "/lib/ext"
608 #define ENDORSED_DIR "/lib/endorsed"
609
610 char cpu_arch[12];
611 // Buffer that fits several sprintfs.
612 // Note that the space for the colon and the trailing null are provided
613 // by the nulls included by the sizeof operator.
614 const size_t bufsize =
615 MAX4((size_t)MAXPATHLEN, // For dll_dir & friends.
616 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
617 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
618 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
619 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
620
621 // sysclasspath, java_home, dll_dir
622 {
623 char *pslash;
624 os::jvm_path(buf, bufsize);
625
626 // Found the full path to libjvm.so.
627 // Now cut the path to <java_home>/jre if we can.
628 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
629 pslash = strrchr(buf, '/');
630 if (pslash != NULL) {
631 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
632 }
633 Arguments::set_dll_dir(buf);
634
635 if (pslash != NULL) {
636 pslash = strrchr(buf, '/');
637 if (pslash != NULL) {
638 *pslash = '\0'; // Get rid of /<arch>.
639 pslash = strrchr(buf, '/');
640 if (pslash != NULL) {
641 *pslash = '\0'; // Get rid of /lib.
642 }
643 }
644 }
645 Arguments::set_java_home(buf);
646 set_boot_path('/', ':');
647 }
648
649 // Where to look for native libraries.
650 {
651 // Use dlinfo() to determine the correct java.library.path.
652 //
653 // If we're launched by the Java launcher, and the user
654 // does not set java.library.path explicitly on the commandline,
655 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
656 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
657 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
658 // /usr/lib), which is exactly what we want.
659 //
660 // If the user does set java.library.path, it completely
661 // overwrites this setting, and always has.
662 //
663 // If we're not launched by the Java launcher, we may
664 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
665 // settings. Again, dlinfo does exactly what we want.
666
667 Dl_serinfo info_sz, *info = &info_sz;
668 Dl_serpath *path;
669 char *library_path;
670 char *common_path = buf;
671
672 // Determine search path count and required buffer size.
673 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
674 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
675 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
676 }
677
678 // Allocate new buffer and initialize.
679 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
680 info->dls_size = info_sz.dls_size;
681 info->dls_cnt = info_sz.dls_cnt;
682
683 // Obtain search path information.
684 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
685 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
686 FREE_C_HEAP_ARRAY(char, info, mtInternal);
687 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
688 }
689
690 path = &info->dls_serpath[0];
691
692 // Note: Due to a legacy implementation, most of the library path
693 // is set in the launcher. This was to accomodate linking restrictions
694 // on legacy Solaris implementations (which are no longer supported).
695 // Eventually, all the library path setting will be done here.
696 //
697 // However, to prevent the proliferation of improperly built native
698 // libraries, the new path component /usr/jdk/packages is added here.
699
700 // Determine the actual CPU architecture.
701 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
702 #ifdef _LP64
703 // If we are a 64-bit vm, perform the following translations:
704 // sparc -> sparcv9
705 // i386 -> amd64
706 if (strcmp(cpu_arch, "sparc") == 0) {
707 strcat(cpu_arch, "v9");
708 } else if (strcmp(cpu_arch, "i386") == 0) {
709 strcpy(cpu_arch, "amd64");
710 }
711 #endif
712
713 // Construct the invariant part of ld_library_path.
714 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
715
716 // Struct size is more than sufficient for the path components obtained
717 // through the dlinfo() call, so only add additional space for the path
718 // components explicitly added here.
719 size_t library_path_size = info->dls_size + strlen(common_path);
720 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
721 library_path[0] = '\0';
722
723 // Construct the desired Java library path from the linker's library
724 // search path.
725 //
726 // For compatibility, it is optimal that we insert the additional path
727 // components specific to the Java VM after those components specified
728 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
729 // infrastructure.
730 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
731 strcpy(library_path, common_path);
732 } else {
733 int inserted = 0;
734 int i;
735 for (i = 0; i < info->dls_cnt; i++, path++) {
736 uint_t flags = path->dls_flags & LA_SER_MASK;
737 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
738 strcat(library_path, common_path);
739 strcat(library_path, os::path_separator());
740 inserted = 1;
741 }
742 strcat(library_path, path->dls_name);
743 strcat(library_path, os::path_separator());
744 }
745 // Eliminate trailing path separator.
746 library_path[strlen(library_path)-1] = '\0';
747 }
748
749 // happens before argument parsing - can't use a trace flag
750 // tty->print_raw("init_system_properties_values: native lib path: ");
751 // tty->print_raw_cr(library_path);
752
753 // Callee copies into its own buffer.
754 Arguments::set_library_path(library_path);
755
756 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
757 FREE_C_HEAP_ARRAY(char, info, mtInternal);
758 }
759
760 // Extensions directories.
761 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
762 Arguments::set_ext_dirs(buf);
763
764 // Endorsed standards default directory.
765 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
766 Arguments::set_endorsed_dirs(buf);
767
768 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
769
770 #undef SYS_EXT_DIR
771 #undef EXTENSIONS_DIR
772 #undef ENDORSED_DIR
773 }
774
775 void os::breakpoint() {
776 BREAKPOINT;
777 }
778
779 bool os::obsolete_option(const JavaVMOption *option)
780 {
781 if (!strncmp(option->optionString, "-Xt", 3)) {
782 return true;
783 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
784 return true;
785 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
786 return true;
787 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
788 return true;
789 }
790 return false;
791 }
792
793 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
794 address stackStart = (address)thread->stack_base();
795 address stackEnd = (address)(stackStart - (address)thread->stack_size());
796 if (sp < stackStart && sp >= stackEnd ) return true;
797 return false;
798 }
799
800 extern "C" void breakpoint() {
801 // use debugger to set breakpoint here
802 }
803
804 static thread_t main_thread;
805
806 // Thread start routine for all new Java threads
807 extern "C" void* java_start(void* thread_addr) {
808 // Try to randomize the cache line index of hot stack frames.
809 // This helps when threads of the same stack traces evict each other's
810 // cache lines. The threads can be either from the same JVM instance, or
811 // from different JVM instances. The benefit is especially true for
812 // processors with hyperthreading technology.
813 static int counter = 0;
814 int pid = os::current_process_id();
815 alloca(((pid ^ counter++) & 7) * 128);
816
817 int prio;
818 Thread* thread = (Thread*)thread_addr;
819 OSThread* osthr = thread->osthread();
820
821 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound
822 thread->_schedctl = (void *) schedctl_init () ;
823
824 if (UseNUMA) {
825 int lgrp_id = os::numa_get_group_id();
826 if (lgrp_id != -1) {
827 thread->set_lgrp_id(lgrp_id);
828 }
829 }
830
831 // If the creator called set priority before we started,
832 // we need to call set_native_priority now that we have an lwp.
833 // We used to get the priority from thr_getprio (we called
834 // thr_setprio way back in create_thread) and pass it to
835 // set_native_priority, but Solaris scales the priority
836 // in java_to_os_priority, so when we read it back here,
837 // we pass trash to set_native_priority instead of what's
838 // in java_to_os_priority. So we save the native priority
839 // in the osThread and recall it here.
840
841 if ( osthr->thread_id() != -1 ) {
842 if ( UseThreadPriorities ) {
843 int prio = osthr->native_priority();
844 if (ThreadPriorityVerbose) {
845 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
846 INTPTR_FORMAT ", setting priority: %d\n",
847 osthr->thread_id(), osthr->lwp_id(), prio);
848 }
849 os::set_native_priority(thread, prio);
850 }
851 } else if (ThreadPriorityVerbose) {
852 warning("Can't set priority in _start routine, thread id hasn't been set\n");
853 }
854
855 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
856
857 // initialize signal mask for this thread
858 os::Solaris::hotspot_sigmask(thread);
859
860 thread->run();
861
862 // One less thread is executing
863 // When the VMThread gets here, the main thread may have already exited
864 // which frees the CodeHeap containing the Atomic::dec code
865 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
866 Atomic::dec(&os::Solaris::_os_thread_count);
867 }
868
869 if (UseDetachedThreads) {
870 thr_exit(NULL);
871 ShouldNotReachHere();
872 }
873 return NULL;
874 }
875
876 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
877 // Allocate the OSThread object
878 OSThread* osthread = new OSThread(NULL, NULL);
879 if (osthread == NULL) return NULL;
880
881 // Store info on the Solaris thread into the OSThread
882 osthread->set_thread_id(thread_id);
883 osthread->set_lwp_id(_lwp_self());
884 thread->_schedctl = (void *) schedctl_init () ;
885
886 if (UseNUMA) {
887 int lgrp_id = os::numa_get_group_id();
888 if (lgrp_id != -1) {
889 thread->set_lgrp_id(lgrp_id);
890 }
891 }
892
893 if ( ThreadPriorityVerbose ) {
894 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
895 osthread->thread_id(), osthread->lwp_id() );
896 }
897
898 // Initial thread state is INITIALIZED, not SUSPENDED
899 osthread->set_state(INITIALIZED);
900
901 return osthread;
902 }
903
904 void os::Solaris::hotspot_sigmask(Thread* thread) {
905
906 //Save caller's signal mask
907 sigset_t sigmask;
908 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
909 OSThread *osthread = thread->osthread();
910 osthread->set_caller_sigmask(sigmask);
911
912 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
913 if (!ReduceSignalUsage) {
914 if (thread->is_VM_thread()) {
915 // Only the VM thread handles BREAK_SIGNAL ...
916 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
917 } else {
918 // ... all other threads block BREAK_SIGNAL
919 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
920 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
921 }
922 }
923 }
924
925 bool os::create_attached_thread(JavaThread* thread) {
926 #ifdef ASSERT
927 thread->verify_not_published();
928 #endif
929 OSThread* osthread = create_os_thread(thread, thr_self());
930 if (osthread == NULL) {
931 return false;
932 }
933
934 // Initial thread state is RUNNABLE
935 osthread->set_state(RUNNABLE);
936 thread->set_osthread(osthread);
937
938 // initialize signal mask for this thread
939 // and save the caller's signal mask
940 os::Solaris::hotspot_sigmask(thread);
941
942 return true;
943 }
944
945 bool os::create_main_thread(JavaThread* thread) {
946 #ifdef ASSERT
947 thread->verify_not_published();
948 #endif
949 if (_starting_thread == NULL) {
950 _starting_thread = create_os_thread(thread, main_thread);
951 if (_starting_thread == NULL) {
952 return false;
953 }
954 }
955
956 // The primodial thread is runnable from the start
957 _starting_thread->set_state(RUNNABLE);
958
959 thread->set_osthread(_starting_thread);
960
961 // initialize signal mask for this thread
962 // and save the caller's signal mask
963 os::Solaris::hotspot_sigmask(thread);
964
965 return true;
966 }
967
968 // _T2_libthread is true if we believe we are running with the newer
969 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default)
970 bool os::Solaris::_T2_libthread = false;
971
972 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
973 // Allocate the OSThread object
974 OSThread* osthread = new OSThread(NULL, NULL);
975 if (osthread == NULL) {
976 return false;
977 }
978
979 if ( ThreadPriorityVerbose ) {
980 char *thrtyp;
981 switch ( thr_type ) {
982 case vm_thread:
983 thrtyp = (char *)"vm";
984 break;
985 case cgc_thread:
986 thrtyp = (char *)"cgc";
987 break;
988 case pgc_thread:
989 thrtyp = (char *)"pgc";
990 break;
991 case java_thread:
992 thrtyp = (char *)"java";
993 break;
994 case compiler_thread:
995 thrtyp = (char *)"compiler";
996 break;
997 case watcher_thread:
998 thrtyp = (char *)"watcher";
999 break;
1000 default:
1001 thrtyp = (char *)"unknown";
1002 break;
1003 }
1004 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1005 }
1006
1007 // Calculate stack size if it's not specified by caller.
1008 if (stack_size == 0) {
1009 // The default stack size 1M (2M for LP64).
1010 stack_size = (BytesPerWord >> 2) * K * K;
1011
1012 switch (thr_type) {
1013 case os::java_thread:
1014 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1015 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1016 break;
1017 case os::compiler_thread:
1018 if (CompilerThreadStackSize > 0) {
1019 stack_size = (size_t)(CompilerThreadStackSize * K);
1020 break;
1021 } // else fall through:
1022 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1023 case os::vm_thread:
1024 case os::pgc_thread:
1025 case os::cgc_thread:
1026 case os::watcher_thread:
1027 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1028 break;
1029 }
1030 }
1031 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1032
1033 // Initial state is ALLOCATED but not INITIALIZED
1034 osthread->set_state(ALLOCATED);
1035
1036 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1037 // We got lots of threads. Check if we still have some address space left.
1038 // Need to be at least 5Mb of unreserved address space. We do check by
1039 // trying to reserve some.
1040 const size_t VirtualMemoryBangSize = 20*K*K;
1041 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1042 if (mem == NULL) {
1043 delete osthread;
1044 return false;
1045 } else {
1046 // Release the memory again
1047 os::release_memory(mem, VirtualMemoryBangSize);
1048 }
1049 }
1050
1051 // Setup osthread because the child thread may need it.
1052 thread->set_osthread(osthread);
1053
1054 // Create the Solaris thread
1055 // explicit THR_BOUND for T2_libthread case in case
1056 // that assumption is not accurate, but our alternate signal stack
1057 // handling is based on it which must have bound threads
1058 thread_t tid = 0;
1059 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED
1060 | ((UseBoundThreads || os::Solaris::T2_libthread() ||
1061 (thr_type == vm_thread) ||
1062 (thr_type == cgc_thread) ||
1063 (thr_type == pgc_thread) ||
1064 (thr_type == compiler_thread && BackgroundCompilation)) ?
1065 THR_BOUND : 0);
1066 int status;
1067
1068 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs.
1069 //
1070 // On multiprocessors systems, libthread sometimes under-provisions our
1071 // process with LWPs. On a 30-way systems, for instance, we could have
1072 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned
1073 // to our process. This can result in under utilization of PEs.
1074 // I suspect the problem is related to libthread's LWP
1075 // pool management and to the kernel's SIGBLOCKING "last LWP parked"
1076 // upcall policy.
1077 //
1078 // The following code is palliative -- it attempts to ensure that our
1079 // process has sufficient LWPs to take advantage of multiple PEs.
1080 // Proper long-term cures include using user-level threads bound to LWPs
1081 // (THR_BOUND) or using LWP-based synchronization. Note that there is a
1082 // slight timing window with respect to sampling _os_thread_count, but
1083 // the race is benign. Also, we should periodically recompute
1084 // _processors_online as the min of SC_NPROCESSORS_ONLN and the
1085 // the number of PEs in our partition. You might be tempted to use
1086 // THR_NEW_LWP here, but I'd recommend against it as that could
1087 // result in undesirable growth of the libthread's LWP pool.
1088 // The fix below isn't sufficient; for instance, it doesn't take into count
1089 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks.
1090 //
1091 // Some pathologies this scheme doesn't handle:
1092 // * Threads can block, releasing the LWPs. The LWPs can age out.
1093 // When a large number of threads become ready again there aren't
1094 // enough LWPs available to service them. This can occur when the
1095 // number of ready threads oscillates.
1096 // * LWPs/Threads park on IO, thus taking the LWP out of circulation.
1097 //
1098 // Finally, we should call thr_setconcurrency() periodically to refresh
1099 // the LWP pool and thwart the LWP age-out mechanism.
1100 // The "+3" term provides a little slop -- we want to slightly overprovision.
1101
1102 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) {
1103 if (!(flags & THR_BOUND)) {
1104 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation
1105 }
1106 }
1107 // Although this doesn't hurt, we should warn of undefined behavior
1108 // when using unbound T1 threads with schedctl(). This should never
1109 // happen, as the compiler and VM threads are always created bound
1110 DEBUG_ONLY(
1111 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) &&
1112 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) &&
1113 ((thr_type == vm_thread) || (thr_type == cgc_thread) ||
1114 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) {
1115 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound");
1116 }
1117 );
1118
1119
1120 // Mark that we don't have an lwp or thread id yet.
1121 // In case we attempt to set the priority before the thread starts.
1122 osthread->set_lwp_id(-1);
1123 osthread->set_thread_id(-1);
1124
1125 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1126 if (status != 0) {
1127 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1128 perror("os::create_thread");
1129 }
1130 thread->set_osthread(NULL);
1131 // Need to clean up stuff we've allocated so far
1132 delete osthread;
1133 return false;
1134 }
1135
1136 Atomic::inc(&os::Solaris::_os_thread_count);
1137
1138 // Store info on the Solaris thread into the OSThread
1139 osthread->set_thread_id(tid);
1140
1141 // Remember that we created this thread so we can set priority on it
1142 osthread->set_vm_created();
1143
1144 // Set the default thread priority. If using bound threads, setting
1145 // lwp priority will be delayed until thread start.
1146 set_native_priority(thread,
1147 DefaultThreadPriority == -1 ?
1148 java_to_os_priority[NormPriority] :
1149 DefaultThreadPriority);
1150
1151 // Initial thread state is INITIALIZED, not SUSPENDED
1152 osthread->set_state(INITIALIZED);
1153
1154 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1155 return true;
1156 }
1157
1158 /* defined for >= Solaris 10. This allows builds on earlier versions
1159 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1160 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1161 * and -XX:+UseAltSigs does nothing since these should have no conflict
1162 */
1163 #if !defined(SIGJVM1)
1164 #define SIGJVM1 39
1165 #define SIGJVM2 40
1166 #endif
1167
1168 debug_only(static bool signal_sets_initialized = false);
1169 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1170 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1171 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1172
1173 bool os::Solaris::is_sig_ignored(int sig) {
1174 struct sigaction oact;
1175 sigaction(sig, (struct sigaction*)NULL, &oact);
1176 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1177 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1178 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1179 return true;
1180 else
1181 return false;
1182 }
1183
1184 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1185 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1186 static bool isJVM1available() {
1187 return SIGJVM1 < SIGRTMIN;
1188 }
1189
1190 void os::Solaris::signal_sets_init() {
1191 // Should also have an assertion stating we are still single-threaded.
1192 assert(!signal_sets_initialized, "Already initialized");
1193 // Fill in signals that are necessarily unblocked for all threads in
1194 // the VM. Currently, we unblock the following signals:
1195 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1196 // by -Xrs (=ReduceSignalUsage));
1197 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1198 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1199 // the dispositions or masks wrt these signals.
1200 // Programs embedding the VM that want to use the above signals for their
1201 // own purposes must, at this time, use the "-Xrs" option to prevent
1202 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1203 // (See bug 4345157, and other related bugs).
1204 // In reality, though, unblocking these signals is really a nop, since
1205 // these signals are not blocked by default.
1206 sigemptyset(&unblocked_sigs);
1207 sigemptyset(&allowdebug_blocked_sigs);
1208 sigaddset(&unblocked_sigs, SIGILL);
1209 sigaddset(&unblocked_sigs, SIGSEGV);
1210 sigaddset(&unblocked_sigs, SIGBUS);
1211 sigaddset(&unblocked_sigs, SIGFPE);
1212
1213 if (isJVM1available) {
1214 os::Solaris::set_SIGinterrupt(SIGJVM1);
1215 os::Solaris::set_SIGasync(SIGJVM2);
1216 } else if (UseAltSigs) {
1217 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1218 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1219 } else {
1220 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1221 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1222 }
1223
1224 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1225 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1226
1227 if (!ReduceSignalUsage) {
1228 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1229 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1230 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1231 }
1232 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1233 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1234 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1235 }
1236 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1237 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1238 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1239 }
1240 }
1241 // Fill in signals that are blocked by all but the VM thread.
1242 sigemptyset(&vm_sigs);
1243 if (!ReduceSignalUsage)
1244 sigaddset(&vm_sigs, BREAK_SIGNAL);
1245 debug_only(signal_sets_initialized = true);
1246
1247 // For diagnostics only used in run_periodic_checks
1248 sigemptyset(&check_signal_done);
1249 }
1250
1251 // These are signals that are unblocked while a thread is running Java.
1252 // (For some reason, they get blocked by default.)
1253 sigset_t* os::Solaris::unblocked_signals() {
1254 assert(signal_sets_initialized, "Not initialized");
1255 return &unblocked_sigs;
1256 }
1257
1258 // These are the signals that are blocked while a (non-VM) thread is
1259 // running Java. Only the VM thread handles these signals.
1260 sigset_t* os::Solaris::vm_signals() {
1261 assert(signal_sets_initialized, "Not initialized");
1262 return &vm_sigs;
1263 }
1264
1265 // These are signals that are blocked during cond_wait to allow debugger in
1266 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1267 assert(signal_sets_initialized, "Not initialized");
1268 return &allowdebug_blocked_sigs;
1269 }
1270
1271
1272 void _handle_uncaught_cxx_exception() {
1273 VMError err("An uncaught C++ exception");
1274 err.report_and_die();
1275 }
1276
1277
1278 // First crack at OS-specific initialization, from inside the new thread.
1279 void os::initialize_thread(Thread* thr) {
1280 int r = thr_main() ;
1281 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ;
1282 if (r) {
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 (void) check_addr0(st);
2045 }
2046
2047 void os::print_siginfo(outputStream* st, void* siginfo) {
2048 const siginfo_t* si = (const siginfo_t*)siginfo;
2049
2050 os::Posix::print_siginfo_brief(st, si);
2051
2052 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2053 UseSharedSpaces) {
2054 FileMapInfo* mapinfo = FileMapInfo::current_info();
2055 if (mapinfo->is_in_shared_space(si->si_addr)) {
2056 st->print("\n\nError accessing class data sharing archive." \
2057 " Mapped file inaccessible during execution, " \
2058 " possible disk/network problem.");
2059 }
2060 }
2061 st->cr();
2062 }
2063
2064 // Moved from whole group, because we need them here for diagnostic
2065 // prints.
2066 #define OLDMAXSIGNUM 32
2067 static int Maxsignum = 0;
2068 static int *ourSigFlags = NULL;
2069
2070 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2071
2072 int os::Solaris::get_our_sigflags(int sig) {
2073 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2074 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2075 return ourSigFlags[sig];
2076 }
2077
2078 void os::Solaris::set_our_sigflags(int sig, int flags) {
2079 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2080 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2081 ourSigFlags[sig] = flags;
2082 }
2083
2084
2085 static const char* get_signal_handler_name(address handler,
2086 char* buf, int buflen) {
2087 int offset;
2088 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2089 if (found) {
2090 // skip directory names
2091 const char *p1, *p2;
2092 p1 = buf;
2093 size_t len = strlen(os::file_separator());
2094 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2095 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2096 } else {
2097 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2098 }
2099 return buf;
2100 }
2101
2102 static void print_signal_handler(outputStream* st, int sig,
2103 char* buf, size_t buflen) {
2104 struct sigaction sa;
2105
2106 sigaction(sig, NULL, &sa);
2107
2108 st->print("%s: ", os::exception_name(sig, buf, buflen));
2109
2110 address handler = (sa.sa_flags & SA_SIGINFO)
2111 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2112 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2113
2114 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2115 st->print("SIG_DFL");
2116 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2117 st->print("SIG_IGN");
2118 } else {
2119 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2120 }
2121
2122 st->print(", sa_mask[0]=");
2123 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2124
2125 address rh = VMError::get_resetted_sighandler(sig);
2126 // May be, handler was resetted by VMError?
2127 if(rh != NULL) {
2128 handler = rh;
2129 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2130 }
2131
2132 st->print(", sa_flags=");
2133 os::Posix::print_sa_flags(st, sa.sa_flags);
2134
2135 // Check: is it our handler?
2136 if(handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2137 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2138 // It is our signal handler
2139 // check for flags
2140 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2141 st->print(
2142 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2143 os::Solaris::get_our_sigflags(sig));
2144 }
2145 }
2146 st->cr();
2147 }
2148
2149 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2150 st->print_cr("Signal Handlers:");
2151 print_signal_handler(st, SIGSEGV, buf, buflen);
2152 print_signal_handler(st, SIGBUS , buf, buflen);
2153 print_signal_handler(st, SIGFPE , buf, buflen);
2154 print_signal_handler(st, SIGPIPE, buf, buflen);
2155 print_signal_handler(st, SIGXFSZ, buf, buflen);
2156 print_signal_handler(st, SIGILL , buf, buflen);
2157 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2158 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2159 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2160 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2161 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2162 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2163 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2164 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2165 }
2166
2167 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2168
2169 // Find the full path to the current module, libjvm.so
2170 void os::jvm_path(char *buf, jint buflen) {
2171 // Error checking.
2172 if (buflen < MAXPATHLEN) {
2173 assert(false, "must use a large-enough buffer");
2174 buf[0] = '\0';
2175 return;
2176 }
2177 // Lazy resolve the path to current module.
2178 if (saved_jvm_path[0] != 0) {
2179 strcpy(buf, saved_jvm_path);
2180 return;
2181 }
2182
2183 Dl_info dlinfo;
2184 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2185 assert(ret != 0, "cannot locate libjvm");
2186 if (ret != 0 && dlinfo.dli_fname != NULL) {
2187 realpath((char *)dlinfo.dli_fname, buf);
2188 } else {
2189 buf[0] = '\0';
2190 return;
2191 }
2192
2193 if (Arguments::created_by_gamma_launcher()) {
2194 // Support for the gamma launcher. Typical value for buf is
2195 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at
2196 // the right place in the string, then assume we are installed in a JDK and
2197 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix
2198 // up the path so it looks like libjvm.so is installed there (append a
2199 // fake suffix hotspot/libjvm.so).
2200 const char *p = buf + strlen(buf) - 1;
2201 for (int count = 0; p > buf && count < 5; ++count) {
2202 for (--p; p > buf && *p != '/'; --p)
2203 /* empty */ ;
2204 }
2205
2206 if (strncmp(p, "/jre/lib/", 9) != 0) {
2207 // Look for JAVA_HOME in the environment.
2208 char* java_home_var = ::getenv("JAVA_HOME");
2209 if (java_home_var != NULL && java_home_var[0] != 0) {
2210 char cpu_arch[12];
2211 char* jrelib_p;
2212 int len;
2213 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2214 #ifdef _LP64
2215 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2216 if (strcmp(cpu_arch, "sparc") == 0) {
2217 strcat(cpu_arch, "v9");
2218 } else if (strcmp(cpu_arch, "i386") == 0) {
2219 strcpy(cpu_arch, "amd64");
2220 }
2221 #endif
2222 // Check the current module name "libjvm.so".
2223 p = strrchr(buf, '/');
2224 assert(strstr(p, "/libjvm") == p, "invalid library name");
2225
2226 realpath(java_home_var, buf);
2227 // determine if this is a legacy image or modules image
2228 // modules image doesn't have "jre" subdirectory
2229 len = strlen(buf);
2230 assert(len < buflen, "Ran out of buffer space");
2231 jrelib_p = buf + len;
2232 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2233 if (0 != access(buf, F_OK)) {
2234 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2235 }
2236
2237 if (0 == access(buf, F_OK)) {
2238 // Use current module name "libjvm.so"
2239 len = strlen(buf);
2240 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2241 } else {
2242 // Go back to path of .so
2243 realpath((char *)dlinfo.dli_fname, buf);
2244 }
2245 }
2246 }
2247 }
2248
2249 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2250 }
2251
2252
2253 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2254 // no prefix required, not even "_"
2255 }
2256
2257
2258 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2259 // no suffix required
2260 }
2261
2262 // This method is a copy of JDK's sysGetLastErrorString
2263 // from src/solaris/hpi/src/system_md.c
2264
2265 size_t os::lasterror(char *buf, size_t len) {
2266
2267 if (errno == 0) return 0;
2268
2269 const char *s = ::strerror(errno);
2270 size_t n = ::strlen(s);
2271 if (n >= len) {
2272 n = len - 1;
2273 }
2274 ::strncpy(buf, s, n);
2275 buf[n] = '\0';
2276 return n;
2277 }
2278
2279
2280 // sun.misc.Signal
2281
2282 extern "C" {
2283 static void UserHandler(int sig, void *siginfo, void *context) {
2284 // Ctrl-C is pressed during error reporting, likely because the error
2285 // handler fails to abort. Let VM die immediately.
2286 if (sig == SIGINT && is_error_reported()) {
2287 os::die();
2288 }
2289
2290 os::signal_notify(sig);
2291 // We do not need to reinstate the signal handler each time...
2292 }
2293 }
2294
2295 void* os::user_handler() {
2296 return CAST_FROM_FN_PTR(void*, UserHandler);
2297 }
2298
2299 class Semaphore : public StackObj {
2300 public:
2301 Semaphore();
2302 ~Semaphore();
2303 void signal();
2304 void wait();
2305 bool trywait();
2306 bool timedwait(unsigned int sec, int nsec);
2307 private:
2308 sema_t _semaphore;
2309 };
2310
2311
2312 Semaphore::Semaphore() {
2313 sema_init(&_semaphore, 0, NULL, NULL);
2314 }
2315
2316 Semaphore::~Semaphore() {
2317 sema_destroy(&_semaphore);
2318 }
2319
2320 void Semaphore::signal() {
2321 sema_post(&_semaphore);
2322 }
2323
2324 void Semaphore::wait() {
2325 sema_wait(&_semaphore);
2326 }
2327
2328 bool Semaphore::trywait() {
2329 return sema_trywait(&_semaphore) == 0;
2330 }
2331
2332 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2333 struct timespec ts;
2334 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2335
2336 while (1) {
2337 int result = sema_timedwait(&_semaphore, &ts);
2338 if (result == 0) {
2339 return true;
2340 } else if (errno == EINTR) {
2341 continue;
2342 } else if (errno == ETIME) {
2343 return false;
2344 } else {
2345 return false;
2346 }
2347 }
2348 }
2349
2350 extern "C" {
2351 typedef void (*sa_handler_t)(int);
2352 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2353 }
2354
2355 void* os::signal(int signal_number, void* handler) {
2356 struct sigaction sigAct, oldSigAct;
2357 sigfillset(&(sigAct.sa_mask));
2358 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2359 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2360
2361 if (sigaction(signal_number, &sigAct, &oldSigAct))
2362 // -1 means registration failed
2363 return (void *)-1;
2364
2365 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2366 }
2367
2368 void os::signal_raise(int signal_number) {
2369 raise(signal_number);
2370 }
2371
2372 /*
2373 * The following code is moved from os.cpp for making this
2374 * code platform specific, which it is by its very nature.
2375 */
2376
2377 // a counter for each possible signal value
2378 static int Sigexit = 0;
2379 static int Maxlibjsigsigs;
2380 static jint *pending_signals = NULL;
2381 static int *preinstalled_sigs = NULL;
2382 static struct sigaction *chainedsigactions = NULL;
2383 static sema_t sig_sem;
2384 typedef int (*version_getting_t)();
2385 version_getting_t os::Solaris::get_libjsig_version = NULL;
2386 static int libjsigversion = NULL;
2387
2388 int os::sigexitnum_pd() {
2389 assert(Sigexit > 0, "signal memory not yet initialized");
2390 return Sigexit;
2391 }
2392
2393 void os::Solaris::init_signal_mem() {
2394 // Initialize signal structures
2395 Maxsignum = SIGRTMAX;
2396 Sigexit = Maxsignum+1;
2397 assert(Maxsignum >0, "Unable to obtain max signal number");
2398
2399 Maxlibjsigsigs = Maxsignum;
2400
2401 // pending_signals has one int per signal
2402 // The additional signal is for SIGEXIT - exit signal to signal_thread
2403 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2404 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2405
2406 if (UseSignalChaining) {
2407 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2408 * (Maxsignum + 1), mtInternal);
2409 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2410 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2411 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2412 }
2413 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2414 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2415 }
2416
2417 void os::signal_init_pd() {
2418 int ret;
2419
2420 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2421 assert(ret == 0, "sema_init() failed");
2422 }
2423
2424 void os::signal_notify(int signal_number) {
2425 int ret;
2426
2427 Atomic::inc(&pending_signals[signal_number]);
2428 ret = ::sema_post(&sig_sem);
2429 assert(ret == 0, "sema_post() failed");
2430 }
2431
2432 static int check_pending_signals(bool wait_for_signal) {
2433 int ret;
2434 while (true) {
2435 for (int i = 0; i < Sigexit + 1; i++) {
2436 jint n = pending_signals[i];
2437 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2438 return i;
2439 }
2440 }
2441 if (!wait_for_signal) {
2442 return -1;
2443 }
2444 JavaThread *thread = JavaThread::current();
2445 ThreadBlockInVM tbivm(thread);
2446
2447 bool threadIsSuspended;
2448 do {
2449 thread->set_suspend_equivalent();
2450 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2451 while((ret = ::sema_wait(&sig_sem)) == EINTR)
2452 ;
2453 assert(ret == 0, "sema_wait() failed");
2454
2455 // were we externally suspended while we were waiting?
2456 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2457 if (threadIsSuspended) {
2458 //
2459 // The semaphore has been incremented, but while we were waiting
2460 // another thread suspended us. We don't want to continue running
2461 // while suspended because that would surprise the thread that
2462 // suspended us.
2463 //
2464 ret = ::sema_post(&sig_sem);
2465 assert(ret == 0, "sema_post() failed");
2466
2467 thread->java_suspend_self();
2468 }
2469 } while (threadIsSuspended);
2470 }
2471 }
2472
2473 int os::signal_lookup() {
2474 return check_pending_signals(false);
2475 }
2476
2477 int os::signal_wait() {
2478 return check_pending_signals(true);
2479 }
2480
2481 ////////////////////////////////////////////////////////////////////////////////
2482 // Virtual Memory
2483
2484 static int page_size = -1;
2485
2486 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2487 // clear this var if support is not available.
2488 static bool has_map_align = true;
2489
2490 int os::vm_page_size() {
2491 assert(page_size != -1, "must call os::init");
2492 return page_size;
2493 }
2494
2495 // Solaris allocates memory by pages.
2496 int os::vm_allocation_granularity() {
2497 assert(page_size != -1, "must call os::init");
2498 return page_size;
2499 }
2500
2501 static bool recoverable_mmap_error(int err) {
2502 // See if the error is one we can let the caller handle. This
2503 // list of errno values comes from the Solaris mmap(2) man page.
2504 switch (err) {
2505 case EBADF:
2506 case EINVAL:
2507 case ENOTSUP:
2508 // let the caller deal with these errors
2509 return true;
2510
2511 default:
2512 // Any remaining errors on this OS can cause our reserved mapping
2513 // to be lost. That can cause confusion where different data
2514 // structures think they have the same memory mapped. The worst
2515 // scenario is if both the VM and a library think they have the
2516 // same memory mapped.
2517 return false;
2518 }
2519 }
2520
2521 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2522 int err) {
2523 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2524 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2525 strerror(err), err);
2526 }
2527
2528 static void warn_fail_commit_memory(char* addr, size_t bytes,
2529 size_t alignment_hint, bool exec,
2530 int err) {
2531 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2532 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2533 alignment_hint, exec, strerror(err), err);
2534 }
2535
2536 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2537 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2538 size_t size = bytes;
2539 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2540 if (res != NULL) {
2541 if (UseNUMAInterleaving) {
2542 numa_make_global(addr, bytes);
2543 }
2544 return 0;
2545 }
2546
2547 int err = errno; // save errno from mmap() call in mmap_chunk()
2548
2549 if (!recoverable_mmap_error(err)) {
2550 warn_fail_commit_memory(addr, bytes, exec, err);
2551 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2552 }
2553
2554 return err;
2555 }
2556
2557 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2558 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2559 }
2560
2561 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2562 const char* mesg) {
2563 assert(mesg != NULL, "mesg must be specified");
2564 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2565 if (err != 0) {
2566 // the caller wants all commit errors to exit with the specified mesg:
2567 warn_fail_commit_memory(addr, bytes, exec, err);
2568 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2569 }
2570 }
2571
2572 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2573 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2574 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2575 alignment, (size_t) vm_page_size()));
2576
2577 for (int i = 0; _page_sizes[i] != 0; i++) {
2578 if (is_size_aligned(alignment, _page_sizes[i])) {
2579 return _page_sizes[i];
2580 }
2581 }
2582
2583 return (size_t) vm_page_size();
2584 }
2585
2586 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2587 size_t alignment_hint, bool exec) {
2588 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2589 if (err == 0 && UseLargePages && alignment_hint > 0) {
2590 assert(is_size_aligned(bytes, alignment_hint),
2591 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint));
2592
2593 // The syscall memcntl requires an exact page size (see man memcntl for details).
2594 size_t page_size = page_size_for_alignment(alignment_hint);
2595 if (page_size > (size_t) vm_page_size()) {
2596 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2597 }
2598 }
2599 return err;
2600 }
2601
2602 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2603 bool exec) {
2604 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2605 }
2606
2607 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2608 size_t alignment_hint, bool exec,
2609 const char* mesg) {
2610 assert(mesg != NULL, "mesg must be specified");
2611 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2612 if (err != 0) {
2613 // the caller wants all commit errors to exit with the specified mesg:
2614 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2615 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2616 }
2617 }
2618
2619 // Uncommit the pages in a specified region.
2620 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2621 if (madvise(addr, bytes, MADV_FREE) < 0) {
2622 debug_only(warning("MADV_FREE failed."));
2623 return;
2624 }
2625 }
2626
2627 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2628 return os::commit_memory(addr, size, !ExecMem);
2629 }
2630
2631 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2632 return os::uncommit_memory(addr, size);
2633 }
2634
2635 // Change the page size in a given range.
2636 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2637 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2638 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2639 if (UseLargePages) {
2640 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2641 }
2642 }
2643
2644 // Tell the OS to make the range local to the first-touching LWP
2645 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2646 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2647 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2648 debug_only(warning("MADV_ACCESS_LWP failed."));
2649 }
2650 }
2651
2652 // Tell the OS that this range would be accessed from different LWPs.
2653 void os::numa_make_global(char *addr, size_t bytes) {
2654 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2655 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2656 debug_only(warning("MADV_ACCESS_MANY failed."));
2657 }
2658 }
2659
2660 // Get the number of the locality groups.
2661 size_t os::numa_get_groups_num() {
2662 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2663 return n != -1 ? n : 1;
2664 }
2665
2666 // Get a list of leaf locality groups. A leaf lgroup is group that
2667 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2668 // board. An LWP is assigned to one of these groups upon creation.
2669 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2670 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2671 ids[0] = 0;
2672 return 1;
2673 }
2674 int result_size = 0, top = 1, bottom = 0, cur = 0;
2675 for (int k = 0; k < size; k++) {
2676 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2677 (Solaris::lgrp_id_t*)&ids[top], size - top);
2678 if (r == -1) {
2679 ids[0] = 0;
2680 return 1;
2681 }
2682 if (!r) {
2683 // That's a leaf node.
2684 assert (bottom <= cur, "Sanity check");
2685 // Check if the node has memory
2686 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2687 NULL, 0, LGRP_RSRC_MEM) > 0) {
2688 ids[bottom++] = ids[cur];
2689 }
2690 }
2691 top += r;
2692 cur++;
2693 }
2694 if (bottom == 0) {
2695 // Handle a situation, when the OS reports no memory available.
2696 // Assume UMA architecture.
2697 ids[0] = 0;
2698 return 1;
2699 }
2700 return bottom;
2701 }
2702
2703 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2704 bool os::numa_topology_changed() {
2705 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2706 if (is_stale != -1 && is_stale) {
2707 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2708 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2709 assert(c != 0, "Failure to initialize LGRP API");
2710 Solaris::set_lgrp_cookie(c);
2711 return true;
2712 }
2713 return false;
2714 }
2715
2716 // Get the group id of the current LWP.
2717 int os::numa_get_group_id() {
2718 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2719 if (lgrp_id == -1) {
2720 return 0;
2721 }
2722 const int size = os::numa_get_groups_num();
2723 int *ids = (int*)alloca(size * sizeof(int));
2724
2725 // Get the ids of all lgroups with memory; r is the count.
2726 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2727 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2728 if (r <= 0) {
2729 return 0;
2730 }
2731 return ids[os::random() % r];
2732 }
2733
2734 // Request information about the page.
2735 bool os::get_page_info(char *start, page_info* info) {
2736 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2737 uint64_t addr = (uintptr_t)start;
2738 uint64_t outdata[2];
2739 uint_t validity = 0;
2740
2741 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2742 return false;
2743 }
2744
2745 info->size = 0;
2746 info->lgrp_id = -1;
2747
2748 if ((validity & 1) != 0) {
2749 if ((validity & 2) != 0) {
2750 info->lgrp_id = outdata[0];
2751 }
2752 if ((validity & 4) != 0) {
2753 info->size = outdata[1];
2754 }
2755 return true;
2756 }
2757 return false;
2758 }
2759
2760 // Scan the pages from start to end until a page different than
2761 // the one described in the info parameter is encountered.
2762 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2763 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2764 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2765 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2766 uint_t validity[MAX_MEMINFO_CNT];
2767
2768 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2769 uint64_t p = (uint64_t)start;
2770 while (p < (uint64_t)end) {
2771 addrs[0] = p;
2772 size_t addrs_count = 1;
2773 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2774 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2775 addrs_count++;
2776 }
2777
2778 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2779 return NULL;
2780 }
2781
2782 size_t i = 0;
2783 for (; i < addrs_count; i++) {
2784 if ((validity[i] & 1) != 0) {
2785 if ((validity[i] & 4) != 0) {
2786 if (outdata[types * i + 1] != page_expected->size) {
2787 break;
2788 }
2789 } else
2790 if (page_expected->size != 0) {
2791 break;
2792 }
2793
2794 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2795 if (outdata[types * i] != page_expected->lgrp_id) {
2796 break;
2797 }
2798 }
2799 } else {
2800 return NULL;
2801 }
2802 }
2803
2804 if (i < addrs_count) {
2805 if ((validity[i] & 2) != 0) {
2806 page_found->lgrp_id = outdata[types * i];
2807 } else {
2808 page_found->lgrp_id = -1;
2809 }
2810 if ((validity[i] & 4) != 0) {
2811 page_found->size = outdata[types * i + 1];
2812 } else {
2813 page_found->size = 0;
2814 }
2815 return (char*)addrs[i];
2816 }
2817
2818 p = addrs[addrs_count - 1] + page_size;
2819 }
2820 return end;
2821 }
2822
2823 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2824 size_t size = bytes;
2825 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2826 // uncommitted page. Otherwise, the read/write might succeed if we
2827 // have enough swap space to back the physical page.
2828 return
2829 NULL != Solaris::mmap_chunk(addr, size,
2830 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2831 PROT_NONE);
2832 }
2833
2834 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2835 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2836
2837 if (b == MAP_FAILED) {
2838 return NULL;
2839 }
2840 return b;
2841 }
2842
2843 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2844 char* addr = requested_addr;
2845 int flags = MAP_PRIVATE | MAP_NORESERVE;
2846
2847 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2848
2849 if (fixed) {
2850 flags |= MAP_FIXED;
2851 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2852 flags |= MAP_ALIGN;
2853 addr = (char*) alignment_hint;
2854 }
2855
2856 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2857 // uncommitted page. Otherwise, the read/write might succeed if we
2858 // have enough swap space to back the physical page.
2859 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2860 }
2861
2862 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2863 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2864
2865 guarantee(requested_addr == NULL || requested_addr == addr,
2866 "OS failed to return requested mmap address.");
2867 return addr;
2868 }
2869
2870 // Reserve memory at an arbitrary address, only if that area is
2871 // available (and not reserved for something else).
2872
2873 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2874 const int max_tries = 10;
2875 char* base[max_tries];
2876 size_t size[max_tries];
2877
2878 // Solaris adds a gap between mmap'ed regions. The size of the gap
2879 // is dependent on the requested size and the MMU. Our initial gap
2880 // value here is just a guess and will be corrected later.
2881 bool had_top_overlap = false;
2882 bool have_adjusted_gap = false;
2883 size_t gap = 0x400000;
2884
2885 // Assert only that the size is a multiple of the page size, since
2886 // that's all that mmap requires, and since that's all we really know
2887 // about at this low abstraction level. If we need higher alignment,
2888 // we can either pass an alignment to this method or verify alignment
2889 // in one of the methods further up the call chain. See bug 5044738.
2890 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2891
2892 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2893 // Give it a try, if the kernel honors the hint we can return immediately.
2894 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2895
2896 volatile int err = errno;
2897 if (addr == requested_addr) {
2898 return addr;
2899 } else if (addr != NULL) {
2900 pd_unmap_memory(addr, bytes);
2901 }
2902
2903 if (PrintMiscellaneous && Verbose) {
2904 char buf[256];
2905 buf[0] = '\0';
2906 if (addr == NULL) {
2907 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2908 }
2909 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2910 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2911 "%s", bytes, requested_addr, addr, buf);
2912 }
2913
2914 // Address hint method didn't work. Fall back to the old method.
2915 // In theory, once SNV becomes our oldest supported platform, this
2916 // code will no longer be needed.
2917 //
2918 // Repeatedly allocate blocks until the block is allocated at the
2919 // right spot. Give up after max_tries.
2920 int i;
2921 for (i = 0; i < max_tries; ++i) {
2922 base[i] = reserve_memory(bytes);
2923
2924 if (base[i] != NULL) {
2925 // Is this the block we wanted?
2926 if (base[i] == requested_addr) {
2927 size[i] = bytes;
2928 break;
2929 }
2930
2931 // check that the gap value is right
2932 if (had_top_overlap && !have_adjusted_gap) {
2933 size_t actual_gap = base[i-1] - base[i] - bytes;
2934 if (gap != actual_gap) {
2935 // adjust the gap value and retry the last 2 allocations
2936 assert(i > 0, "gap adjustment code problem");
2937 have_adjusted_gap = true; // adjust the gap only once, just in case
2938 gap = actual_gap;
2939 if (PrintMiscellaneous && Verbose) {
2940 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2941 }
2942 unmap_memory(base[i], bytes);
2943 unmap_memory(base[i-1], size[i-1]);
2944 i-=2;
2945 continue;
2946 }
2947 }
2948
2949 // Does this overlap the block we wanted? Give back the overlapped
2950 // parts and try again.
2951 //
2952 // There is still a bug in this code: if top_overlap == bytes,
2953 // the overlap is offset from requested region by the value of gap.
2954 // In this case giving back the overlapped part will not work,
2955 // because we'll give back the entire block at base[i] and
2956 // therefore the subsequent allocation will not generate a new gap.
2957 // This could be fixed with a new algorithm that used larger
2958 // or variable size chunks to find the requested region -
2959 // but such a change would introduce additional complications.
2960 // It's rare enough that the planets align for this bug,
2961 // so we'll just wait for a fix for 6204603/5003415 which
2962 // will provide a mmap flag to allow us to avoid this business.
2963
2964 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2965 if (top_overlap >= 0 && top_overlap < bytes) {
2966 had_top_overlap = true;
2967 unmap_memory(base[i], top_overlap);
2968 base[i] += top_overlap;
2969 size[i] = bytes - top_overlap;
2970 } else {
2971 size_t bottom_overlap = base[i] + bytes - requested_addr;
2972 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2973 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2974 warning("attempt_reserve_memory_at: possible alignment bug");
2975 }
2976 unmap_memory(requested_addr, bottom_overlap);
2977 size[i] = bytes - bottom_overlap;
2978 } else {
2979 size[i] = bytes;
2980 }
2981 }
2982 }
2983 }
2984
2985 // Give back the unused reserved pieces.
2986
2987 for (int j = 0; j < i; ++j) {
2988 if (base[j] != NULL) {
2989 unmap_memory(base[j], size[j]);
2990 }
2991 }
2992
2993 return (i < max_tries) ? requested_addr : NULL;
2994 }
2995
2996 bool os::pd_release_memory(char* addr, size_t bytes) {
2997 size_t size = bytes;
2998 return munmap(addr, size) == 0;
2999 }
3000
3001 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
3002 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
3003 "addr must be page aligned");
3004 int retVal = mprotect(addr, bytes, prot);
3005 return retVal == 0;
3006 }
3007
3008 // Protect memory (Used to pass readonly pages through
3009 // JNI GetArray<type>Elements with empty arrays.)
3010 // Also, used for serialization page and for compressed oops null pointer
3011 // checking.
3012 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
3013 bool is_committed) {
3014 unsigned int p = 0;
3015 switch (prot) {
3016 case MEM_PROT_NONE: p = PROT_NONE; break;
3017 case MEM_PROT_READ: p = PROT_READ; break;
3018 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
3019 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
3020 default:
3021 ShouldNotReachHere();
3022 }
3023 // is_committed is unused.
3024 return solaris_mprotect(addr, bytes, p);
3025 }
3026
3027 // guard_memory and unguard_memory only happens within stack guard pages.
3028 // Since ISM pertains only to the heap, guard and unguard memory should not
3029 /// happen with an ISM region.
3030 bool os::guard_memory(char* addr, size_t bytes) {
3031 return solaris_mprotect(addr, bytes, PROT_NONE);
3032 }
3033
3034 bool os::unguard_memory(char* addr, size_t bytes) {
3035 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
3036 }
3037
3038 // Large page support
3039 static size_t _large_page_size = 0;
3040
3041 // Insertion sort for small arrays (descending order).
3042 static void insertion_sort_descending(size_t* array, int len) {
3043 for (int i = 0; i < len; i++) {
3044 size_t val = array[i];
3045 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3046 size_t tmp = array[key];
3047 array[key] = array[key - 1];
3048 array[key - 1] = tmp;
3049 }
3050 }
3051 }
3052
3053 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3054 const unsigned int usable_count = VM_Version::page_size_count();
3055 if (usable_count == 1) {
3056 return false;
3057 }
3058
3059 // Find the right getpagesizes interface. When solaris 11 is the minimum
3060 // build platform, getpagesizes() (without the '2') can be called directly.
3061 typedef int (*gps_t)(size_t[], int);
3062 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3063 if (gps_func == NULL) {
3064 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3065 if (gps_func == NULL) {
3066 if (warn) {
3067 warning("MPSS is not supported by the operating system.");
3068 }
3069 return false;
3070 }
3071 }
3072
3073 // Fill the array of page sizes.
3074 int n = (*gps_func)(_page_sizes, page_sizes_max);
3075 assert(n > 0, "Solaris bug?");
3076
3077 if (n == page_sizes_max) {
3078 // Add a sentinel value (necessary only if the array was completely filled
3079 // since it is static (zeroed at initialization)).
3080 _page_sizes[--n] = 0;
3081 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3082 }
3083 assert(_page_sizes[n] == 0, "missing sentinel");
3084 trace_page_sizes("available page sizes", _page_sizes, n);
3085
3086 if (n == 1) return false; // Only one page size available.
3087
3088 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3089 // select up to usable_count elements. First sort the array, find the first
3090 // acceptable value, then copy the usable sizes to the top of the array and
3091 // trim the rest. Make sure to include the default page size :-).
3092 //
3093 // A better policy could get rid of the 4M limit by taking the sizes of the
3094 // important VM memory regions (java heap and possibly the code cache) into
3095 // account.
3096 insertion_sort_descending(_page_sizes, n);
3097 const size_t size_limit =
3098 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3099 int beg;
3100 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ;
3101 const int end = MIN2((int)usable_count, n) - 1;
3102 for (int cur = 0; cur < end; ++cur, ++beg) {
3103 _page_sizes[cur] = _page_sizes[beg];
3104 }
3105 _page_sizes[end] = vm_page_size();
3106 _page_sizes[end + 1] = 0;
3107
3108 if (_page_sizes[end] > _page_sizes[end - 1]) {
3109 // Default page size is not the smallest; sort again.
3110 insertion_sort_descending(_page_sizes, end + 1);
3111 }
3112 *page_size = _page_sizes[0];
3113
3114 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3115 return true;
3116 }
3117
3118 void os::large_page_init() {
3119 if (UseLargePages) {
3120 // print a warning if any large page related flag is specified on command line
3121 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3122 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3123
3124 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3125 }
3126 }
3127
3128 bool os::Solaris::is_valid_page_size(size_t bytes) {
3129 for (int i = 0; _page_sizes[i] != 0; i++) {
3130 if (_page_sizes[i] == bytes) {
3131 return true;
3132 }
3133 }
3134 return false;
3135 }
3136
3137 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3138 assert(is_valid_page_size(align), err_msg(SIZE_FORMAT " is not a valid page size", align));
3139 assert(is_ptr_aligned((void*) start, align),
3140 err_msg(PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align));
3141 assert(is_size_aligned(bytes, align),
3142 err_msg(SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align));
3143
3144 // Signal to OS that we want large pages for addresses
3145 // from addr, addr + bytes
3146 struct memcntl_mha mpss_struct;
3147 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3148 mpss_struct.mha_pagesize = align;
3149 mpss_struct.mha_flags = 0;
3150 // Upon successful completion, memcntl() returns 0
3151 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3152 debug_only(warning("Attempt to use MPSS failed."));
3153 return false;
3154 }
3155 return true;
3156 }
3157
3158 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3159 fatal("os::reserve_memory_special should not be called on Solaris.");
3160 return NULL;
3161 }
3162
3163 bool os::release_memory_special(char* base, size_t bytes) {
3164 fatal("os::release_memory_special should not be called on Solaris.");
3165 return false;
3166 }
3167
3168 size_t os::large_page_size() {
3169 return _large_page_size;
3170 }
3171
3172 // MPSS allows application to commit large page memory on demand; with ISM
3173 // the entire memory region must be allocated as shared memory.
3174 bool os::can_commit_large_page_memory() {
3175 return true;
3176 }
3177
3178 bool os::can_execute_large_page_memory() {
3179 return true;
3180 }
3181
3182 static int os_sleep(jlong millis, bool interruptible) {
3183 const jlong limit = INT_MAX;
3184 jlong prevtime;
3185 int res;
3186
3187 while (millis > limit) {
3188 if ((res = os_sleep(limit, interruptible)) != OS_OK)
3189 return res;
3190 millis -= limit;
3191 }
3192
3193 // Restart interrupted polls with new parameters until the proper delay
3194 // has been completed.
3195
3196 prevtime = getTimeMillis();
3197
3198 while (millis > 0) {
3199 jlong newtime;
3200
3201 if (!interruptible) {
3202 // Following assert fails for os::yield_all:
3203 // assert(!thread->is_Java_thread(), "must not be java thread");
3204 res = poll(NULL, 0, millis);
3205 } else {
3206 JavaThread *jt = JavaThread::current();
3207
3208 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt,
3209 os::Solaris::clear_interrupted);
3210 }
3211
3212 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for
3213 // thread.Interrupt.
3214
3215 // See c/r 6751923. Poll can return 0 before time
3216 // has elapsed if time is set via clock_settime (as NTP does).
3217 // res == 0 if poll timed out (see man poll RETURN VALUES)
3218 // using the logic below checks that we really did
3219 // sleep at least "millis" if not we'll sleep again.
3220 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) {
3221 newtime = getTimeMillis();
3222 assert(newtime >= prevtime, "time moving backwards");
3223 /* Doing prevtime and newtime in microseconds doesn't help precision,
3224 and trying to round up to avoid lost milliseconds can result in a
3225 too-short delay. */
3226 millis -= newtime - prevtime;
3227 if(millis <= 0)
3228 return OS_OK;
3229 prevtime = newtime;
3230 } else
3231 return res;
3232 }
3233
3234 return OS_OK;
3235 }
3236
3237 // Read calls from inside the vm need to perform state transitions
3238 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3239 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3240 }
3241
3242 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3243 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted);
3244 }
3245
3246 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
3247 assert(thread == Thread::current(), "thread consistency check");
3248
3249 // TODO-FIXME: this should be removed.
3250 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock
3251 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate
3252 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving
3253 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel
3254 // is fooled into believing that the system is making progress. In the code below we block the
3255 // the watcher thread while safepoint is in progress so that it would not appear as though the
3256 // system is making progress.
3257 if (!Solaris::T2_libthread() &&
3258 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) {
3259 // We now try to acquire the threads lock. Since this lock is held by the VM thread during
3260 // the entire safepoint, the watcher thread will line up here during the safepoint.
3261 Threads_lock->lock_without_safepoint_check();
3262 Threads_lock->unlock();
3263 }
3264
3265 if (thread->is_Java_thread()) {
3266 // This is a JavaThread so we honor the _thread_blocked protocol
3267 // even for sleeps of 0 milliseconds. This was originally done
3268 // as a workaround for bug 4338139. However, now we also do it
3269 // to honor the suspend-equivalent protocol.
3270
3271 JavaThread *jt = (JavaThread *) thread;
3272 ThreadBlockInVM tbivm(jt);
3273
3274 jt->set_suspend_equivalent();
3275 // cleared by handle_special_suspend_equivalent_condition() or
3276 // java_suspend_self() via check_and_wait_while_suspended()
3277
3278 int ret_code;
3279 if (millis <= 0) {
3280 thr_yield();
3281 ret_code = 0;
3282 } else {
3283 // The original sleep() implementation did not create an
3284 // OSThreadWaitState helper for sleeps of 0 milliseconds.
3285 // I'm preserving that decision for now.
3286 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
3287
3288 ret_code = os_sleep(millis, interruptible);
3289 }
3290
3291 // were we externally suspended while we were waiting?
3292 jt->check_and_wait_while_suspended();
3293
3294 return ret_code;
3295 }
3296
3297 // non-JavaThread from this point on:
3298
3299 if (millis <= 0) {
3300 thr_yield();
3301 return 0;
3302 }
3303
3304 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
3305
3306 return os_sleep(millis, interruptible);
3307 }
3308
3309 void os::naked_short_sleep(jlong ms) {
3310 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3311
3312 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3313 // Solaris requires -lrt for this.
3314 usleep((ms * 1000));
3315
3316 return;
3317 }
3318
3319 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3320 void os::infinite_sleep() {
3321 while (true) { // sleep forever ...
3322 ::sleep(100); // ... 100 seconds at a time
3323 }
3324 }
3325
3326 // Used to convert frequent JVM_Yield() to nops
3327 bool os::dont_yield() {
3328 if (DontYieldALot) {
3329 static hrtime_t last_time = 0;
3330 hrtime_t diff = getTimeNanos() - last_time;
3331
3332 if (diff < DontYieldALotInterval * 1000000)
3333 return true;
3334
3335 last_time += diff;
3336
3337 return false;
3338 }
3339 else {
3340 return false;
3341 }
3342 }
3343
3344 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3345 // the linux and win32 implementations do not. This should be checked.
3346
3347 void os::yield() {
3348 // Yields to all threads with same or greater priority
3349 os::sleep(Thread::current(), 0, false);
3350 }
3351
3352 // Note that yield semantics are defined by the scheduling class to which
3353 // the thread currently belongs. Typically, yield will _not yield to
3354 // other equal or higher priority threads that reside on the dispatch queues
3355 // of other CPUs.
3356
3357 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3358
3359
3360 // On Solaris we found that yield_all doesn't always yield to all other threads.
3361 // There have been cases where there is a thread ready to execute but it doesn't
3362 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond.
3363 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a
3364 // SIGWAITING signal which will cause a new lwp to be created. So we count the
3365 // number of times yield_all is called in the one loop and increase the sleep
3366 // time after 8 attempts. If this fails too we increase the concurrency level
3367 // so that the starving thread would get an lwp
3368
3369 void os::yield_all(int attempts) {
3370 // Yields to all threads, including threads with lower priorities
3371 if (attempts == 0) {
3372 os::sleep(Thread::current(), 1, false);
3373 } else {
3374 int iterations = attempts % 30;
3375 if (iterations == 0 && !os::Solaris::T2_libthread()) {
3376 // thr_setconcurrency and _getconcurrency make sense only under T1.
3377 int noofLWPS = thr_getconcurrency();
3378 if (noofLWPS < (Threads::number_of_threads() + 2)) {
3379 thr_setconcurrency(thr_getconcurrency() + 1);
3380 }
3381 } else if (iterations < 25) {
3382 os::sleep(Thread::current(), 1, false);
3383 } else {
3384 os::sleep(Thread::current(), 10, false);
3385 }
3386 }
3387 }
3388
3389 // Called from the tight loops to possibly influence time-sharing heuristics
3390 void os::loop_breaker(int attempts) {
3391 os::yield_all(attempts);
3392 }
3393
3394
3395 // Interface for setting lwp priorities. If we are using T2 libthread,
3396 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3397 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3398 // function is meaningless in this mode so we must adjust the real lwp's priority
3399 // The routines below implement the getting and setting of lwp priorities.
3400 //
3401 // Note: There are three priority scales used on Solaris. Java priotities
3402 // which range from 1 to 10, libthread "thr_setprio" scale which range
3403 // from 0 to 127, and the current scheduling class of the process we
3404 // are running in. This is typically from -60 to +60.
3405 // The setting of the lwp priorities in done after a call to thr_setprio
3406 // so Java priorities are mapped to libthread priorities and we map from
3407 // the latter to lwp priorities. We don't keep priorities stored in
3408 // Java priorities since some of our worker threads want to set priorities
3409 // higher than all Java threads.
3410 //
3411 // For related information:
3412 // (1) man -s 2 priocntl
3413 // (2) man -s 4 priocntl
3414 // (3) man dispadmin
3415 // = librt.so
3416 // = libthread/common/rtsched.c - thrp_setlwpprio().
3417 // = ps -cL <pid> ... to validate priority.
3418 // = sched_get_priority_min and _max
3419 // pthread_create
3420 // sched_setparam
3421 // pthread_setschedparam
3422 //
3423 // Assumptions:
3424 // + We assume that all threads in the process belong to the same
3425 // scheduling class. IE. an homogenous process.
3426 // + Must be root or in IA group to change change "interactive" attribute.
3427 // Priocntl() will fail silently. The only indication of failure is when
3428 // we read-back the value and notice that it hasn't changed.
3429 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3430 // + For RT, change timeslice as well. Invariant:
3431 // constant "priority integral"
3432 // Konst == TimeSlice * (60-Priority)
3433 // Given a priority, compute appropriate timeslice.
3434 // + Higher numerical values have higher priority.
3435
3436 // sched class attributes
3437 typedef struct {
3438 int schedPolicy; // classID
3439 int maxPrio;
3440 int minPrio;
3441 } SchedInfo;
3442
3443
3444 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3445
3446 #ifdef ASSERT
3447 static int ReadBackValidate = 1;
3448 #endif
3449 static int myClass = 0;
3450 static int myMin = 0;
3451 static int myMax = 0;
3452 static int myCur = 0;
3453 static bool priocntl_enable = false;
3454
3455 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3456 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3457
3458
3459 // lwp_priocntl_init
3460 //
3461 // Try to determine the priority scale for our process.
3462 //
3463 // Return errno or 0 if OK.
3464 //
3465 static int lwp_priocntl_init () {
3466 int rslt;
3467 pcinfo_t ClassInfo;
3468 pcparms_t ParmInfo;
3469 int i;
3470
3471 if (!UseThreadPriorities) return 0;
3472
3473 // We are using Bound threads, we need to determine our priority ranges
3474 if (os::Solaris::T2_libthread() || UseBoundThreads) {
3475 // If ThreadPriorityPolicy is 1, switch tables
3476 if (ThreadPriorityPolicy == 1) {
3477 for (i = 0 ; i < CriticalPriority+1; i++)
3478 os::java_to_os_priority[i] = prio_policy1[i];
3479 }
3480 if (UseCriticalJavaThreadPriority) {
3481 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3482 // See set_native_priority() and set_lwp_class_and_priority().
3483 // Save original MaxPriority mapping in case attempt to
3484 // use critical priority fails.
3485 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3486 // Set negative to distinguish from other priorities
3487 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3488 }
3489 }
3490 // Not using Bound Threads, set to ThreadPolicy 1
3491 else {
3492 for ( i = 0 ; i < CriticalPriority+1; i++ ) {
3493 os::java_to_os_priority[i] = prio_policy1[i];
3494 }
3495 return 0;
3496 }
3497
3498 // Get IDs for a set of well-known scheduling classes.
3499 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3500 // the system. We should have a loop that iterates over the
3501 // classID values, which are known to be "small" integers.
3502
3503 strcpy(ClassInfo.pc_clname, "TS");
3504 ClassInfo.pc_cid = -1;
3505 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3506 if (rslt < 0) return errno;
3507 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3508 tsLimits.schedPolicy = ClassInfo.pc_cid;
3509 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3510 tsLimits.minPrio = -tsLimits.maxPrio;
3511
3512 strcpy(ClassInfo.pc_clname, "IA");
3513 ClassInfo.pc_cid = -1;
3514 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3515 if (rslt < 0) return errno;
3516 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3517 iaLimits.schedPolicy = ClassInfo.pc_cid;
3518 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3519 iaLimits.minPrio = -iaLimits.maxPrio;
3520
3521 strcpy(ClassInfo.pc_clname, "RT");
3522 ClassInfo.pc_cid = -1;
3523 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3524 if (rslt < 0) return errno;
3525 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3526 rtLimits.schedPolicy = ClassInfo.pc_cid;
3527 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3528 rtLimits.minPrio = 0;
3529
3530 strcpy(ClassInfo.pc_clname, "FX");
3531 ClassInfo.pc_cid = -1;
3532 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3533 if (rslt < 0) return errno;
3534 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3535 fxLimits.schedPolicy = ClassInfo.pc_cid;
3536 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3537 fxLimits.minPrio = 0;
3538
3539 // Query our "current" scheduling class.
3540 // This will normally be IA, TS or, rarely, FX or RT.
3541 memset(&ParmInfo, 0, sizeof(ParmInfo));
3542 ParmInfo.pc_cid = PC_CLNULL;
3543 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3544 if (rslt < 0) return errno;
3545 myClass = ParmInfo.pc_cid;
3546
3547 // We now know our scheduling classId, get specific information
3548 // about the class.
3549 ClassInfo.pc_cid = myClass;
3550 ClassInfo.pc_clname[0] = 0;
3551 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3552 if (rslt < 0) return errno;
3553
3554 if (ThreadPriorityVerbose) {
3555 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3556 }
3557
3558 memset(&ParmInfo, 0, sizeof(pcparms_t));
3559 ParmInfo.pc_cid = PC_CLNULL;
3560 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3561 if (rslt < 0) return errno;
3562
3563 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3564 myMin = rtLimits.minPrio;
3565 myMax = rtLimits.maxPrio;
3566 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3567 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3568 myMin = iaLimits.minPrio;
3569 myMax = iaLimits.maxPrio;
3570 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3571 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3572 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3573 myMin = tsLimits.minPrio;
3574 myMax = tsLimits.maxPrio;
3575 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3576 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3577 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3578 myMin = fxLimits.minPrio;
3579 myMax = fxLimits.maxPrio;
3580 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3581 } else {
3582 // No clue - punt
3583 if (ThreadPriorityVerbose)
3584 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3585 return EINVAL; // no clue, punt
3586 }
3587
3588 if (ThreadPriorityVerbose) {
3589 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax);
3590 }
3591
3592 priocntl_enable = true; // Enable changing priorities
3593 return 0;
3594 }
3595
3596 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3597 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3598 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3599 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3600
3601
3602 // scale_to_lwp_priority
3603 //
3604 // Convert from the libthread "thr_setprio" scale to our current
3605 // lwp scheduling class scale.
3606 //
3607 static
3608 int scale_to_lwp_priority (int rMin, int rMax, int x)
3609 {
3610 int v;
3611
3612 if (x == 127) return rMax; // avoid round-down
3613 v = (((x*(rMax-rMin)))/128)+rMin;
3614 return v;
3615 }
3616
3617
3618 // set_lwp_class_and_priority
3619 //
3620 // Set the class and priority of the lwp. This call should only
3621 // be made when using bound threads (T2 threads are bound by default).
3622 //
3623 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3624 int newPrio, int new_class, bool scale) {
3625 int rslt;
3626 int Actual, Expected, prv;
3627 pcparms_t ParmInfo; // for GET-SET
3628 #ifdef ASSERT
3629 pcparms_t ReadBack; // for readback
3630 #endif
3631
3632 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3633 // Query current values.
3634 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3635 // Cache "pcparms_t" in global ParmCache.
3636 // TODO: elide set-to-same-value
3637
3638 // If something went wrong on init, don't change priorities.
3639 if ( !priocntl_enable ) {
3640 if (ThreadPriorityVerbose)
3641 tty->print_cr("Trying to set priority but init failed, ignoring");
3642 return EINVAL;
3643 }
3644
3645 // If lwp hasn't started yet, just return
3646 // the _start routine will call us again.
3647 if ( lwpid <= 0 ) {
3648 if (ThreadPriorityVerbose) {
3649 tty->print_cr ("deferring the set_lwp_class_and_priority of thread "
3650 INTPTR_FORMAT " to %d, lwpid not set",
3651 ThreadID, newPrio);
3652 }
3653 return 0;
3654 }
3655
3656 if (ThreadPriorityVerbose) {
3657 tty->print_cr ("set_lwp_class_and_priority("
3658 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3659 ThreadID, lwpid, newPrio);
3660 }
3661
3662 memset(&ParmInfo, 0, sizeof(pcparms_t));
3663 ParmInfo.pc_cid = PC_CLNULL;
3664 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3665 if (rslt < 0) return errno;
3666
3667 int cur_class = ParmInfo.pc_cid;
3668 ParmInfo.pc_cid = (id_t)new_class;
3669
3670 if (new_class == rtLimits.schedPolicy) {
3671 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3672 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3673 rtLimits.maxPrio, newPrio)
3674 : newPrio;
3675 rtInfo->rt_tqsecs = RT_NOCHANGE;
3676 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3677 if (ThreadPriorityVerbose) {
3678 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3679 }
3680 } else if (new_class == iaLimits.schedPolicy) {
3681 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3682 int maxClamped = MIN2(iaLimits.maxPrio,
3683 cur_class == new_class
3684 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3685 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3686 maxClamped, newPrio)
3687 : newPrio;
3688 iaInfo->ia_uprilim = cur_class == new_class
3689 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3690 iaInfo->ia_mode = IA_NOCHANGE;
3691 if (ThreadPriorityVerbose) {
3692 tty->print_cr("IA: [%d...%d] %d->%d\n",
3693 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3694 }
3695 } else if (new_class == tsLimits.schedPolicy) {
3696 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3697 int maxClamped = MIN2(tsLimits.maxPrio,
3698 cur_class == new_class
3699 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3700 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3701 maxClamped, newPrio)
3702 : newPrio;
3703 tsInfo->ts_uprilim = cur_class == new_class
3704 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3705 if (ThreadPriorityVerbose) {
3706 tty->print_cr("TS: [%d...%d] %d->%d\n",
3707 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3708 }
3709 } else if (new_class == fxLimits.schedPolicy) {
3710 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3711 int maxClamped = MIN2(fxLimits.maxPrio,
3712 cur_class == new_class
3713 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3714 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3715 maxClamped, newPrio)
3716 : newPrio;
3717 fxInfo->fx_uprilim = cur_class == new_class
3718 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3719 fxInfo->fx_tqsecs = FX_NOCHANGE;
3720 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3721 if (ThreadPriorityVerbose) {
3722 tty->print_cr("FX: [%d...%d] %d->%d\n",
3723 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3724 }
3725 } else {
3726 if (ThreadPriorityVerbose) {
3727 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3728 }
3729 return EINVAL; // no clue, punt
3730 }
3731
3732 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3733 if (ThreadPriorityVerbose && rslt) {
3734 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3735 }
3736 if (rslt < 0) return errno;
3737
3738 #ifdef ASSERT
3739 // Sanity check: read back what we just attempted to set.
3740 // In theory it could have changed in the interim ...
3741 //
3742 // The priocntl system call is tricky.
3743 // Sometimes it'll validate the priority value argument and
3744 // return EINVAL if unhappy. At other times it fails silently.
3745 // Readbacks are prudent.
3746
3747 if (!ReadBackValidate) return 0;
3748
3749 memset(&ReadBack, 0, sizeof(pcparms_t));
3750 ReadBack.pc_cid = PC_CLNULL;
3751 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3752 assert(rslt >= 0, "priocntl failed");
3753 Actual = Expected = 0xBAD;
3754 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3755 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3756 Actual = RTPRI(ReadBack)->rt_pri;
3757 Expected = RTPRI(ParmInfo)->rt_pri;
3758 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3759 Actual = IAPRI(ReadBack)->ia_upri;
3760 Expected = IAPRI(ParmInfo)->ia_upri;
3761 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3762 Actual = TSPRI(ReadBack)->ts_upri;
3763 Expected = TSPRI(ParmInfo)->ts_upri;
3764 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3765 Actual = FXPRI(ReadBack)->fx_upri;
3766 Expected = FXPRI(ParmInfo)->fx_upri;
3767 } else {
3768 if (ThreadPriorityVerbose) {
3769 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3770 ParmInfo.pc_cid);
3771 }
3772 }
3773
3774 if (Actual != Expected) {
3775 if (ThreadPriorityVerbose) {
3776 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3777 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3778 }
3779 }
3780 #endif
3781
3782 return 0;
3783 }
3784
3785 // Solaris only gives access to 128 real priorities at a time,
3786 // so we expand Java's ten to fill this range. This would be better
3787 // if we dynamically adjusted relative priorities.
3788 //
3789 // The ThreadPriorityPolicy option allows us to select 2 different
3790 // priority scales.
3791 //
3792 // ThreadPriorityPolicy=0
3793 // Since the Solaris' default priority is MaximumPriority, we do not
3794 // set a priority lower than Max unless a priority lower than
3795 // NormPriority is requested.
3796 //
3797 // ThreadPriorityPolicy=1
3798 // This mode causes the priority table to get filled with
3799 // linear values. NormPriority get's mapped to 50% of the
3800 // Maximum priority an so on. This will cause VM threads
3801 // to get unfair treatment against other Solaris processes
3802 // which do not explicitly alter their thread priorities.
3803 //
3804
3805 int os::java_to_os_priority[CriticalPriority + 1] = {
3806 -99999, // 0 Entry should never be used
3807
3808 0, // 1 MinPriority
3809 32, // 2
3810 64, // 3
3811
3812 96, // 4
3813 127, // 5 NormPriority
3814 127, // 6
3815
3816 127, // 7
3817 127, // 8
3818 127, // 9 NearMaxPriority
3819
3820 127, // 10 MaxPriority
3821
3822 -criticalPrio // 11 CriticalPriority
3823 };
3824
3825 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3826 OSThread* osthread = thread->osthread();
3827
3828 // Save requested priority in case the thread hasn't been started
3829 osthread->set_native_priority(newpri);
3830
3831 // Check for critical priority request
3832 bool fxcritical = false;
3833 if (newpri == -criticalPrio) {
3834 fxcritical = true;
3835 newpri = criticalPrio;
3836 }
3837
3838 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3839 if (!UseThreadPriorities) return OS_OK;
3840
3841 int status = 0;
3842
3843 if (!fxcritical) {
3844 // Use thr_setprio only if we have a priority that thr_setprio understands
3845 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3846 }
3847
3848 if (os::Solaris::T2_libthread() ||
3849 (UseBoundThreads && osthread->is_vm_created())) {
3850 int lwp_status =
3851 set_lwp_class_and_priority(osthread->thread_id(),
3852 osthread->lwp_id(),
3853 newpri,
3854 fxcritical ? fxLimits.schedPolicy : myClass,
3855 !fxcritical);
3856 if (lwp_status != 0 && fxcritical) {
3857 // Try again, this time without changing the scheduling class
3858 newpri = java_MaxPriority_to_os_priority;
3859 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3860 osthread->lwp_id(),
3861 newpri, myClass, false);
3862 }
3863 status |= lwp_status;
3864 }
3865 return (status == 0) ? OS_OK : OS_ERR;
3866 }
3867
3868
3869 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3870 int p;
3871 if ( !UseThreadPriorities ) {
3872 *priority_ptr = NormalPriority;
3873 return OS_OK;
3874 }
3875 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3876 if (status != 0) {
3877 return OS_ERR;
3878 }
3879 *priority_ptr = p;
3880 return OS_OK;
3881 }
3882
3883
3884 // Hint to the underlying OS that a task switch would not be good.
3885 // Void return because it's a hint and can fail.
3886 void os::hint_no_preempt() {
3887 schedctl_start(schedctl_init());
3888 }
3889
3890 static void resume_clear_context(OSThread *osthread) {
3891 osthread->set_ucontext(NULL);
3892 }
3893
3894 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3895 osthread->set_ucontext(context);
3896 }
3897
3898 static Semaphore sr_semaphore;
3899
3900 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3901 // Save and restore errno to avoid confusing native code with EINTR
3902 // after sigsuspend.
3903 int old_errno = errno;
3904
3905 OSThread* osthread = thread->osthread();
3906 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3907
3908 os::SuspendResume::State current = osthread->sr.state();
3909 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3910 suspend_save_context(osthread, uc);
3911
3912 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3913 os::SuspendResume::State state = osthread->sr.suspended();
3914 if (state == os::SuspendResume::SR_SUSPENDED) {
3915 sigset_t suspend_set; // signals for sigsuspend()
3916
3917 // get current set of blocked signals and unblock resume signal
3918 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3919 sigdelset(&suspend_set, os::Solaris::SIGasync());
3920
3921 sr_semaphore.signal();
3922 // wait here until we are resumed
3923 while (1) {
3924 sigsuspend(&suspend_set);
3925
3926 os::SuspendResume::State result = osthread->sr.running();
3927 if (result == os::SuspendResume::SR_RUNNING) {
3928 sr_semaphore.signal();
3929 break;
3930 }
3931 }
3932
3933 } else if (state == os::SuspendResume::SR_RUNNING) {
3934 // request was cancelled, continue
3935 } else {
3936 ShouldNotReachHere();
3937 }
3938
3939 resume_clear_context(osthread);
3940 } else if (current == os::SuspendResume::SR_RUNNING) {
3941 // request was cancelled, continue
3942 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3943 // ignore
3944 } else {
3945 // ignore
3946 }
3947
3948 errno = old_errno;
3949 }
3950
3951
3952 void os::interrupt(Thread* thread) {
3953 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3954
3955 OSThread* osthread = thread->osthread();
3956
3957 int isInterrupted = osthread->interrupted();
3958 if (!isInterrupted) {
3959 osthread->set_interrupted(true);
3960 OrderAccess::fence();
3961 // os::sleep() is implemented with either poll (NULL,0,timeout) or
3962 // by parking on _SleepEvent. If the former, thr_kill will unwedge
3963 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper.
3964 ParkEvent * const slp = thread->_SleepEvent ;
3965 if (slp != NULL) slp->unpark() ;
3966 }
3967
3968 // For JSR166: unpark after setting status but before thr_kill -dl
3969 if (thread->is_Java_thread()) {
3970 ((JavaThread*)thread)->parker()->unpark();
3971 }
3972
3973 // Handle interruptible wait() ...
3974 ParkEvent * const ev = thread->_ParkEvent ;
3975 if (ev != NULL) ev->unpark() ;
3976
3977 // When events are used everywhere for os::sleep, then this thr_kill
3978 // will only be needed if UseVMInterruptibleIO is true.
3979
3980 if (!isInterrupted) {
3981 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt());
3982 assert_status(status == 0, status, "thr_kill");
3983
3984 // Bump thread interruption counter
3985 RuntimeService::record_thread_interrupt_signaled_count();
3986 }
3987 }
3988
3989
3990 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3991 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer");
3992
3993 OSThread* osthread = thread->osthread();
3994
3995 bool res = osthread->interrupted();
3996
3997 // NOTE that since there is no "lock" around these two operations,
3998 // there is the possibility that the interrupted flag will be
3999 // "false" but that the interrupt event will be set. This is
4000 // intentional. The effect of this is that Object.wait() will appear
4001 // to have a spurious wakeup, which is not harmful, and the
4002 // possibility is so rare that it is not worth the added complexity
4003 // to add yet another lock. It has also been recommended not to put
4004 // the interrupted flag into the os::Solaris::Event structure,
4005 // because it hides the issue.
4006 if (res && clear_interrupted) {
4007 osthread->set_interrupted(false);
4008 }
4009 return res;
4010 }
4011
4012
4013 void os::print_statistics() {
4014 }
4015
4016 int os::message_box(const char* title, const char* message) {
4017 int i;
4018 fdStream err(defaultStream::error_fd());
4019 for (i = 0; i < 78; i++) err.print_raw("=");
4020 err.cr();
4021 err.print_raw_cr(title);
4022 for (i = 0; i < 78; i++) err.print_raw("-");
4023 err.cr();
4024 err.print_raw_cr(message);
4025 for (i = 0; i < 78; i++) err.print_raw("=");
4026 err.cr();
4027
4028 char buf[16];
4029 // Prevent process from exiting upon "read error" without consuming all CPU
4030 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4031
4032 return buf[0] == 'y' || buf[0] == 'Y';
4033 }
4034
4035 static int sr_notify(OSThread* osthread) {
4036 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
4037 assert_status(status == 0, status, "thr_kill");
4038 return status;
4039 }
4040
4041 // "Randomly" selected value for how long we want to spin
4042 // before bailing out on suspending a thread, also how often
4043 // we send a signal to a thread we want to resume
4044 static const int RANDOMLY_LARGE_INTEGER = 1000000;
4045 static const int RANDOMLY_LARGE_INTEGER2 = 100;
4046
4047 static bool do_suspend(OSThread* osthread) {
4048 assert(osthread->sr.is_running(), "thread should be running");
4049 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
4050
4051 // mark as suspended and send signal
4052 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
4053 // failed to switch, state wasn't running?
4054 ShouldNotReachHere();
4055 return false;
4056 }
4057
4058 if (sr_notify(osthread) != 0) {
4059 ShouldNotReachHere();
4060 }
4061
4062 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
4063 while (true) {
4064 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
4065 break;
4066 } else {
4067 // timeout
4068 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
4069 if (cancelled == os::SuspendResume::SR_RUNNING) {
4070 return false;
4071 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
4072 // make sure that we consume the signal on the semaphore as well
4073 sr_semaphore.wait();
4074 break;
4075 } else {
4076 ShouldNotReachHere();
4077 return false;
4078 }
4079 }
4080 }
4081
4082 guarantee(osthread->sr.is_suspended(), "Must be suspended");
4083 return true;
4084 }
4085
4086 static void do_resume(OSThread* osthread) {
4087 assert(osthread->sr.is_suspended(), "thread should be suspended");
4088 assert(!sr_semaphore.trywait(), "invalid semaphore state");
4089
4090 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
4091 // failed to switch to WAKEUP_REQUEST
4092 ShouldNotReachHere();
4093 return;
4094 }
4095
4096 while (true) {
4097 if (sr_notify(osthread) == 0) {
4098 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
4099 if (osthread->sr.is_running()) {
4100 return;
4101 }
4102 }
4103 } else {
4104 ShouldNotReachHere();
4105 }
4106 }
4107
4108 guarantee(osthread->sr.is_running(), "Must be running!");
4109 }
4110
4111 void os::SuspendedThreadTask::internal_do_task() {
4112 if (do_suspend(_thread->osthread())) {
4113 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4114 do_task(context);
4115 do_resume(_thread->osthread());
4116 }
4117 }
4118
4119 class PcFetcher : public os::SuspendedThreadTask {
4120 public:
4121 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4122 ExtendedPC result();
4123 protected:
4124 void do_task(const os::SuspendedThreadTaskContext& context);
4125 private:
4126 ExtendedPC _epc;
4127 };
4128
4129 ExtendedPC PcFetcher::result() {
4130 guarantee(is_done(), "task is not done yet.");
4131 return _epc;
4132 }
4133
4134 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4135 Thread* thread = context.thread();
4136 OSThread* osthread = thread->osthread();
4137 if (osthread->ucontext() != NULL) {
4138 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
4139 } else {
4140 // NULL context is unexpected, double-check this is the VMThread
4141 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4142 }
4143 }
4144
4145 // A lightweight implementation that does not suspend the target thread and
4146 // thus returns only a hint. Used for profiling only!
4147 ExtendedPC os::get_thread_pc(Thread* thread) {
4148 // Make sure that it is called by the watcher and the Threads lock is owned.
4149 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
4150 // For now, is only used to profile the VM Thread
4151 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4152 PcFetcher fetcher(thread);
4153 fetcher.run();
4154 return fetcher.result();
4155 }
4156
4157
4158 // This does not do anything on Solaris. This is basically a hook for being
4159 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
4160 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
4161 f(value, method, args, thread);
4162 }
4163
4164 // This routine may be used by user applications as a "hook" to catch signals.
4165 // The user-defined signal handler must pass unrecognized signals to this
4166 // routine, and if it returns true (non-zero), then the signal handler must
4167 // return immediately. If the flag "abort_if_unrecognized" is true, then this
4168 // routine will never retun false (zero), but instead will execute a VM panic
4169 // routine kill the process.
4170 //
4171 // If this routine returns false, it is OK to call it again. This allows
4172 // the user-defined signal handler to perform checks either before or after
4173 // the VM performs its own checks. Naturally, the user code would be making
4174 // a serious error if it tried to handle an exception (such as a null check
4175 // or breakpoint) that the VM was generating for its own correct operation.
4176 //
4177 // This routine may recognize any of the following kinds of signals:
4178 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
4179 // os::Solaris::SIGasync
4180 // It should be consulted by handlers for any of those signals.
4181 // It explicitly does not recognize os::Solaris::SIGinterrupt
4182 //
4183 // The caller of this routine must pass in the three arguments supplied
4184 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
4185 // field of the structure passed to sigaction(). This routine assumes that
4186 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
4187 //
4188 // Note that the VM will print warnings if it detects conflicting signal
4189 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
4190 //
4191 extern "C" JNIEXPORT int
4192 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
4193 int abort_if_unrecognized);
4194
4195
4196 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
4197 int orig_errno = errno; // Preserve errno value over signal handler.
4198 JVM_handle_solaris_signal(sig, info, ucVoid, true);
4199 errno = orig_errno;
4200 }
4201
4202 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
4203 is needed to provoke threads blocked on IO to return an EINTR
4204 Note: this explicitly does NOT call JVM_handle_solaris_signal and
4205 does NOT participate in signal chaining due to requirement for
4206 NOT setting SA_RESTART to make EINTR work. */
4207 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
4208 if (UseSignalChaining) {
4209 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
4210 if (actp && actp->sa_handler) {
4211 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
4212 }
4213 }
4214 }
4215
4216 // This boolean allows users to forward their own non-matching signals
4217 // to JVM_handle_solaris_signal, harmlessly.
4218 bool os::Solaris::signal_handlers_are_installed = false;
4219
4220 // For signal-chaining
4221 bool os::Solaris::libjsig_is_loaded = false;
4222 typedef struct sigaction *(*get_signal_t)(int);
4223 get_signal_t os::Solaris::get_signal_action = NULL;
4224
4225 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
4226 struct sigaction *actp = NULL;
4227
4228 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
4229 // Retrieve the old signal handler from libjsig
4230 actp = (*get_signal_action)(sig);
4231 }
4232 if (actp == NULL) {
4233 // Retrieve the preinstalled signal handler from jvm
4234 actp = get_preinstalled_handler(sig);
4235 }
4236
4237 return actp;
4238 }
4239
4240 static bool call_chained_handler(struct sigaction *actp, int sig,
4241 siginfo_t *siginfo, void *context) {
4242 // Call the old signal handler
4243 if (actp->sa_handler == SIG_DFL) {
4244 // It's more reasonable to let jvm treat it as an unexpected exception
4245 // instead of taking the default action.
4246 return false;
4247 } else if (actp->sa_handler != SIG_IGN) {
4248 if ((actp->sa_flags & SA_NODEFER) == 0) {
4249 // automaticlly block the signal
4250 sigaddset(&(actp->sa_mask), sig);
4251 }
4252
4253 sa_handler_t hand;
4254 sa_sigaction_t sa;
4255 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
4256 // retrieve the chained handler
4257 if (siginfo_flag_set) {
4258 sa = actp->sa_sigaction;
4259 } else {
4260 hand = actp->sa_handler;
4261 }
4262
4263 if ((actp->sa_flags & SA_RESETHAND) != 0) {
4264 actp->sa_handler = SIG_DFL;
4265 }
4266
4267 // try to honor the signal mask
4268 sigset_t oset;
4269 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
4270
4271 // call into the chained handler
4272 if (siginfo_flag_set) {
4273 (*sa)(sig, siginfo, context);
4274 } else {
4275 (*hand)(sig);
4276 }
4277
4278 // restore the signal mask
4279 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4280 }
4281 // Tell jvm's signal handler the signal is taken care of.
4282 return true;
4283 }
4284
4285 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4286 bool chained = false;
4287 // signal-chaining
4288 if (UseSignalChaining) {
4289 struct sigaction *actp = get_chained_signal_action(sig);
4290 if (actp != NULL) {
4291 chained = call_chained_handler(actp, sig, siginfo, context);
4292 }
4293 }
4294 return chained;
4295 }
4296
4297 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4298 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4299 if (preinstalled_sigs[sig] != 0) {
4300 return &chainedsigactions[sig];
4301 }
4302 return NULL;
4303 }
4304
4305 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4306
4307 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4308 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4309 chainedsigactions[sig] = oldAct;
4310 preinstalled_sigs[sig] = 1;
4311 }
4312
4313 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4314 // Check for overwrite.
4315 struct sigaction oldAct;
4316 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4317 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4318 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4319 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4320 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4321 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4322 if (AllowUserSignalHandlers || !set_installed) {
4323 // Do not overwrite; user takes responsibility to forward to us.
4324 return;
4325 } else if (UseSignalChaining) {
4326 if (oktochain) {
4327 // save the old handler in jvm
4328 save_preinstalled_handler(sig, oldAct);
4329 } else {
4330 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4331 }
4332 // libjsig also interposes the sigaction() call below and saves the
4333 // old sigaction on it own.
4334 } else {
4335 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4336 "%#lx for signal %d.", (long)oldhand, sig));
4337 }
4338 }
4339
4340 struct sigaction sigAct;
4341 sigfillset(&(sigAct.sa_mask));
4342 sigAct.sa_handler = SIG_DFL;
4343
4344 sigAct.sa_sigaction = signalHandler;
4345 // Handle SIGSEGV on alternate signal stack if
4346 // not using stack banging
4347 if (!UseStackBanging && sig == SIGSEGV) {
4348 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4349 // Interruptible i/o requires SA_RESTART cleared so EINTR
4350 // is returned instead of restarting system calls
4351 } else if (sig == os::Solaris::SIGinterrupt()) {
4352 sigemptyset(&sigAct.sa_mask);
4353 sigAct.sa_handler = NULL;
4354 sigAct.sa_flags = SA_SIGINFO;
4355 sigAct.sa_sigaction = sigINTRHandler;
4356 } else {
4357 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4358 }
4359 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4360
4361 sigaction(sig, &sigAct, &oldAct);
4362
4363 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4364 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4365 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4366 }
4367
4368
4369 #define DO_SIGNAL_CHECK(sig) \
4370 if (!sigismember(&check_signal_done, sig)) \
4371 os::Solaris::check_signal_handler(sig)
4372
4373 // This method is a periodic task to check for misbehaving JNI applications
4374 // under CheckJNI, we can add any periodic checks here
4375
4376 void os::run_periodic_checks() {
4377 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4378 // thereby preventing a NULL checks.
4379 if(!check_addr0_done) check_addr0_done = check_addr0(tty);
4380
4381 if (check_signals == false) return;
4382
4383 // SEGV and BUS if overridden could potentially prevent
4384 // generation of hs*.log in the event of a crash, debugging
4385 // such a case can be very challenging, so we absolutely
4386 // check for the following for a good measure:
4387 DO_SIGNAL_CHECK(SIGSEGV);
4388 DO_SIGNAL_CHECK(SIGILL);
4389 DO_SIGNAL_CHECK(SIGFPE);
4390 DO_SIGNAL_CHECK(SIGBUS);
4391 DO_SIGNAL_CHECK(SIGPIPE);
4392 DO_SIGNAL_CHECK(SIGXFSZ);
4393
4394 // ReduceSignalUsage allows the user to override these handlers
4395 // see comments at the very top and jvm_solaris.h
4396 if (!ReduceSignalUsage) {
4397 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4398 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4399 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4400 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4401 }
4402
4403 // See comments above for using JVM1/JVM2 and UseAltSigs
4404 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4405 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4406
4407 }
4408
4409 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4410
4411 static os_sigaction_t os_sigaction = NULL;
4412
4413 void os::Solaris::check_signal_handler(int sig) {
4414 char buf[O_BUFLEN];
4415 address jvmHandler = NULL;
4416
4417 struct sigaction act;
4418 if (os_sigaction == NULL) {
4419 // only trust the default sigaction, in case it has been interposed
4420 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4421 if (os_sigaction == NULL) return;
4422 }
4423
4424 os_sigaction(sig, (struct sigaction*)NULL, &act);
4425
4426 address thisHandler = (act.sa_flags & SA_SIGINFO)
4427 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4428 : CAST_FROM_FN_PTR(address, act.sa_handler) ;
4429
4430
4431 switch(sig) {
4432 case SIGSEGV:
4433 case SIGBUS:
4434 case SIGFPE:
4435 case SIGPIPE:
4436 case SIGXFSZ:
4437 case SIGILL:
4438 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4439 break;
4440
4441 case SHUTDOWN1_SIGNAL:
4442 case SHUTDOWN2_SIGNAL:
4443 case SHUTDOWN3_SIGNAL:
4444 case BREAK_SIGNAL:
4445 jvmHandler = (address)user_handler();
4446 break;
4447
4448 default:
4449 int intrsig = os::Solaris::SIGinterrupt();
4450 int asynsig = os::Solaris::SIGasync();
4451
4452 if (sig == intrsig) {
4453 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4454 } else if (sig == asynsig) {
4455 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4456 } else {
4457 return;
4458 }
4459 break;
4460 }
4461
4462
4463 if (thisHandler != jvmHandler) {
4464 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4465 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4466 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4467 // No need to check this sig any longer
4468 sigaddset(&check_signal_done, sig);
4469 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4470 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4471 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4472 exception_name(sig, buf, O_BUFLEN));
4473 }
4474 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4475 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4476 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4477 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4478 // No need to check this sig any longer
4479 sigaddset(&check_signal_done, sig);
4480 }
4481
4482 // Print all the signal handler state
4483 if (sigismember(&check_signal_done, sig)) {
4484 print_signal_handlers(tty, buf, O_BUFLEN);
4485 }
4486
4487 }
4488
4489 void os::Solaris::install_signal_handlers() {
4490 bool libjsigdone = false;
4491 signal_handlers_are_installed = true;
4492
4493 // signal-chaining
4494 typedef void (*signal_setting_t)();
4495 signal_setting_t begin_signal_setting = NULL;
4496 signal_setting_t end_signal_setting = NULL;
4497 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4498 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4499 if (begin_signal_setting != NULL) {
4500 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4501 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4502 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4503 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4504 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4505 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4506 libjsig_is_loaded = true;
4507 if (os::Solaris::get_libjsig_version != NULL) {
4508 libjsigversion = (*os::Solaris::get_libjsig_version)();
4509 }
4510 assert(UseSignalChaining, "should enable signal-chaining");
4511 }
4512 if (libjsig_is_loaded) {
4513 // Tell libjsig jvm is setting signal handlers
4514 (*begin_signal_setting)();
4515 }
4516
4517 set_signal_handler(SIGSEGV, true, true);
4518 set_signal_handler(SIGPIPE, true, true);
4519 set_signal_handler(SIGXFSZ, true, true);
4520 set_signal_handler(SIGBUS, true, true);
4521 set_signal_handler(SIGILL, true, true);
4522 set_signal_handler(SIGFPE, true, true);
4523
4524
4525 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4526
4527 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4528 // can not register overridable signals which might be > 32
4529 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4530 // Tell libjsig jvm has finished setting signal handlers
4531 (*end_signal_setting)();
4532 libjsigdone = true;
4533 }
4534 }
4535
4536 // Never ok to chain our SIGinterrupt
4537 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4538 set_signal_handler(os::Solaris::SIGasync(), true, true);
4539
4540 if (libjsig_is_loaded && !libjsigdone) {
4541 // Tell libjsig jvm finishes setting signal handlers
4542 (*end_signal_setting)();
4543 }
4544
4545 // We don't activate signal checker if libjsig is in place, we trust ourselves
4546 // and if UserSignalHandler is installed all bets are off.
4547 // Log that signal checking is off only if -verbose:jni is specified.
4548 if (CheckJNICalls) {
4549 if (libjsig_is_loaded) {
4550 if (PrintJNIResolving) {
4551 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4552 }
4553 check_signals = false;
4554 }
4555 if (AllowUserSignalHandlers) {
4556 if (PrintJNIResolving) {
4557 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4558 }
4559 check_signals = false;
4560 }
4561 }
4562 }
4563
4564
4565 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4566
4567 const char * signames[] = {
4568 "SIG0",
4569 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4570 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4571 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4572 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4573 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4574 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4575 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4576 "SIGCANCEL", "SIGLOST"
4577 };
4578
4579 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4580 if (0 < exception_code && exception_code <= SIGRTMAX) {
4581 // signal
4582 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4583 jio_snprintf(buf, size, "%s", signames[exception_code]);
4584 } else {
4585 jio_snprintf(buf, size, "SIG%d", exception_code);
4586 }
4587 return buf;
4588 } else {
4589 return NULL;
4590 }
4591 }
4592
4593 // (Static) wrappers for the new libthread API
4594 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate;
4595 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate;
4596 int_fnP_thread_t_i os::Solaris::_thr_setmutator;
4597 int_fnP_thread_t os::Solaris::_thr_suspend_mutator;
4598 int_fnP_thread_t os::Solaris::_thr_continue_mutator;
4599
4600 // (Static) wrapper for getisax(2) call.
4601 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4602
4603 // (Static) wrappers for the liblgrp API
4604 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4605 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4606 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4607 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4608 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4609 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4610 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4611 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4612 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4613
4614 // (Static) wrapper for meminfo() call.
4615 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4616
4617 static address resolve_symbol_lazy(const char* name) {
4618 address addr = (address) dlsym(RTLD_DEFAULT, name);
4619 if(addr == NULL) {
4620 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4621 addr = (address) dlsym(RTLD_NEXT, name);
4622 }
4623 return addr;
4624 }
4625
4626 static address resolve_symbol(const char* name) {
4627 address addr = resolve_symbol_lazy(name);
4628 if(addr == NULL) {
4629 fatal(dlerror());
4630 }
4631 return addr;
4632 }
4633
4634
4635
4636 // isT2_libthread()
4637 //
4638 // Routine to determine if we are currently using the new T2 libthread.
4639 //
4640 // We determine if we are using T2 by reading /proc/self/lstatus and
4641 // looking for a thread with the ASLWP bit set. If we find this status
4642 // bit set, we must assume that we are NOT using T2. The T2 team
4643 // has approved this algorithm.
4644 //
4645 // We need to determine if we are running with the new T2 libthread
4646 // since setting native thread priorities is handled differently
4647 // when using this library. All threads created using T2 are bound
4648 // threads. Calling thr_setprio is meaningless in this case.
4649 //
4650 bool isT2_libthread() {
4651 static prheader_t * lwpArray = NULL;
4652 static int lwpSize = 0;
4653 static int lwpFile = -1;
4654 lwpstatus_t * that;
4655 char lwpName [128];
4656 bool isT2 = false;
4657
4658 #define ADR(x) ((uintptr_t)(x))
4659 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1))))
4660
4661 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0);
4662 if (lwpFile < 0) {
4663 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n");
4664 return false;
4665 }
4666 lwpSize = 16*1024;
4667 for (;;) {
4668 ::lseek64 (lwpFile, 0, SEEK_SET);
4669 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal);
4670 if (::read(lwpFile, lwpArray, lwpSize) < 0) {
4671 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n");
4672 break;
4673 }
4674 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) {
4675 // We got a good snapshot - now iterate over the list.
4676 int aslwpcount = 0;
4677 for (int i = 0; i < lwpArray->pr_nent; i++ ) {
4678 that = LWPINDEX(lwpArray,i);
4679 if (that->pr_flags & PR_ASLWP) {
4680 aslwpcount++;
4681 }
4682 }
4683 if (aslwpcount == 0) isT2 = true;
4684 break;
4685 }
4686 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize;
4687 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry.
4688 }
4689
4690 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal);
4691 ::close (lwpFile);
4692 if (ThreadPriorityVerbose) {
4693 if (isT2) tty->print_cr("We are running with a T2 libthread\n");
4694 else tty->print_cr("We are not running with a T2 libthread\n");
4695 }
4696 return isT2;
4697 }
4698
4699
4700 void os::Solaris::libthread_init() {
4701 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4702
4703 // Determine if we are running with the new T2 libthread
4704 os::Solaris::set_T2_libthread(isT2_libthread());
4705
4706 lwp_priocntl_init();
4707
4708 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4709 if(func == NULL) {
4710 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4711 // Guarantee that this VM is running on an new enough OS (5.6 or
4712 // later) that it will have a new enough libthread.so.
4713 guarantee(func != NULL, "libthread.so is too old.");
4714 }
4715
4716 // Initialize the new libthread getstate API wrappers
4717 func = resolve_symbol("thr_getstate");
4718 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func));
4719
4720 func = resolve_symbol("thr_setstate");
4721 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func));
4722
4723 func = resolve_symbol("thr_setmutator");
4724 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func));
4725
4726 func = resolve_symbol("thr_suspend_mutator");
4727 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4728
4729 func = resolve_symbol("thr_continue_mutator");
4730 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func));
4731
4732 int size;
4733 void (*handler_info_func)(address *, int *);
4734 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4735 handler_info_func(&handler_start, &size);
4736 handler_end = handler_start + size;
4737 }
4738
4739
4740 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4741 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4742 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4743 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4744 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4745 int os::Solaris::_mutex_scope = USYNC_THREAD;
4746
4747 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4748 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4749 int_fnP_cond_tP os::Solaris::_cond_signal;
4750 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4751 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4752 int_fnP_cond_tP os::Solaris::_cond_destroy;
4753 int os::Solaris::_cond_scope = USYNC_THREAD;
4754
4755 void os::Solaris::synchronization_init() {
4756 if(UseLWPSynchronization) {
4757 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4758 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4759 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4760 os::Solaris::set_mutex_init(lwp_mutex_init);
4761 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4762 os::Solaris::set_mutex_scope(USYNC_THREAD);
4763
4764 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4765 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4766 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4767 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4768 os::Solaris::set_cond_init(lwp_cond_init);
4769 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4770 os::Solaris::set_cond_scope(USYNC_THREAD);
4771 }
4772 else {
4773 os::Solaris::set_mutex_scope(USYNC_THREAD);
4774 os::Solaris::set_cond_scope(USYNC_THREAD);
4775
4776 if(UsePthreads) {
4777 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4778 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4779 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4780 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4781 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4782
4783 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4784 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4785 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4786 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4787 os::Solaris::set_cond_init(pthread_cond_default_init);
4788 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4789 }
4790 else {
4791 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4792 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4793 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4794 os::Solaris::set_mutex_init(::mutex_init);
4795 os::Solaris::set_mutex_destroy(::mutex_destroy);
4796
4797 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4798 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4799 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4800 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4801 os::Solaris::set_cond_init(::cond_init);
4802 os::Solaris::set_cond_destroy(::cond_destroy);
4803 }
4804 }
4805 }
4806
4807 bool os::Solaris::liblgrp_init() {
4808 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4809 if (handle != NULL) {
4810 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4811 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4812 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4813 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4814 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4815 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4816 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4817 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4818 dlsym(handle, "lgrp_cookie_stale")));
4819
4820 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4821 set_lgrp_cookie(c);
4822 return true;
4823 }
4824 return false;
4825 }
4826
4827 void os::Solaris::misc_sym_init() {
4828 address func;
4829
4830 // getisax
4831 func = resolve_symbol_lazy("getisax");
4832 if (func != NULL) {
4833 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4834 }
4835
4836 // meminfo
4837 func = resolve_symbol_lazy("meminfo");
4838 if (func != NULL) {
4839 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4840 }
4841 }
4842
4843 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4844 assert(_getisax != NULL, "_getisax not set");
4845 return _getisax(array, n);
4846 }
4847
4848 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4849 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4850 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4851
4852 void init_pset_getloadavg_ptr(void) {
4853 pset_getloadavg_ptr =
4854 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4855 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4856 warning("pset_getloadavg function not found");
4857 }
4858 }
4859
4860 int os::Solaris::_dev_zero_fd = -1;
4861
4862 // this is called _before_ the global arguments have been parsed
4863 void os::init(void) {
4864 _initial_pid = getpid();
4865
4866 max_hrtime = first_hrtime = gethrtime();
4867
4868 init_random(1234567);
4869
4870 page_size = sysconf(_SC_PAGESIZE);
4871 if (page_size == -1)
4872 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4873 strerror(errno)));
4874 init_page_sizes((size_t) page_size);
4875
4876 Solaris::initialize_system_info();
4877
4878 // Initialize misc. symbols as soon as possible, so we can use them
4879 // if we need them.
4880 Solaris::misc_sym_init();
4881
4882 int fd = ::open("/dev/zero", O_RDWR);
4883 if (fd < 0) {
4884 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4885 } else {
4886 Solaris::set_dev_zero_fd(fd);
4887
4888 // Close on exec, child won't inherit.
4889 fcntl(fd, F_SETFD, FD_CLOEXEC);
4890 }
4891
4892 clock_tics_per_sec = CLK_TCK;
4893
4894 // check if dladdr1() exists; dladdr1 can provide more information than
4895 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4896 // and is available on linker patches for 5.7 and 5.8.
4897 // libdl.so must have been loaded, this call is just an entry lookup
4898 void * hdl = dlopen("libdl.so", RTLD_NOW);
4899 if (hdl)
4900 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4901
4902 // (Solaris only) this switches to calls that actually do locking.
4903 ThreadCritical::initialize();
4904
4905 main_thread = thr_self();
4906
4907 // Constant minimum stack size allowed. It must be at least
4908 // the minimum of what the OS supports (thr_min_stack()), and
4909 // enough to allow the thread to get to user bytecode execution.
4910 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4911 // If the pagesize of the VM is greater than 8K determine the appropriate
4912 // number of initial guard pages. The user can change this with the
4913 // command line arguments, if needed.
4914 if (vm_page_size() > 8*K) {
4915 StackYellowPages = 1;
4916 StackRedPages = 1;
4917 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4918 }
4919 }
4920
4921 // To install functions for atexit system call
4922 extern "C" {
4923 static void perfMemory_exit_helper() {
4924 perfMemory_exit();
4925 }
4926 }
4927
4928 // this is called _after_ the global arguments have been parsed
4929 jint os::init_2(void) {
4930 // try to enable extended file IO ASAP, see 6431278
4931 os::Solaris::try_enable_extended_io();
4932
4933 // Allocate a single page and mark it as readable for safepoint polling. Also
4934 // use this first mmap call to check support for MAP_ALIGN.
4935 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4936 page_size,
4937 MAP_PRIVATE | MAP_ALIGN,
4938 PROT_READ);
4939 if (polling_page == NULL) {
4940 has_map_align = false;
4941 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4942 PROT_READ);
4943 }
4944
4945 os::set_polling_page(polling_page);
4946
4947 #ifndef PRODUCT
4948 if( Verbose && PrintMiscellaneous )
4949 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4950 #endif
4951
4952 if (!UseMembar) {
4953 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE );
4954 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4955 os::set_memory_serialize_page( mem_serialize_page );
4956
4957 #ifndef PRODUCT
4958 if(Verbose && PrintMiscellaneous)
4959 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4960 #endif
4961 }
4962
4963 // Check minimum allowable stack size for thread creation and to initialize
4964 // the java system classes, including StackOverflowError - depends on page
4965 // size. Add a page for compiler2 recursion in main thread.
4966 // Add in 2*BytesPerWord times page size to account for VM stack during
4967 // class initialization depending on 32 or 64 bit VM.
4968 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4969 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4970 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4971
4972 size_t threadStackSizeInBytes = ThreadStackSize * K;
4973 if (threadStackSizeInBytes != 0 &&
4974 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4975 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4976 os::Solaris::min_stack_allowed/K);
4977 return JNI_ERR;
4978 }
4979
4980 // For 64kbps there will be a 64kb page size, which makes
4981 // the usable default stack size quite a bit less. Increase the
4982 // stack for 64kb (or any > than 8kb) pages, this increases
4983 // virtual memory fragmentation (since we're not creating the
4984 // stack on a power of 2 boundary. The real fix for this
4985 // should be to fix the guard page mechanism.
4986
4987 if (vm_page_size() > 8*K) {
4988 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4989 ? threadStackSizeInBytes +
4990 ((StackYellowPages + StackRedPages) * vm_page_size())
4991 : 0;
4992 ThreadStackSize = threadStackSizeInBytes/K;
4993 }
4994
4995 // Make the stack size a multiple of the page size so that
4996 // the yellow/red zones can be guarded.
4997 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4998 vm_page_size()));
4999
5000 Solaris::libthread_init();
5001
5002 if (UseNUMA) {
5003 if (!Solaris::liblgrp_init()) {
5004 UseNUMA = false;
5005 } else {
5006 size_t lgrp_limit = os::numa_get_groups_num();
5007 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
5008 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
5009 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
5010 if (lgrp_num < 2) {
5011 // There's only one locality group, disable NUMA.
5012 UseNUMA = false;
5013 }
5014 }
5015 if (!UseNUMA && ForceNUMA) {
5016 UseNUMA = true;
5017 }
5018 }
5019
5020 Solaris::signal_sets_init();
5021 Solaris::init_signal_mem();
5022 Solaris::install_signal_handlers();
5023
5024 if (libjsigversion < JSIG_VERSION_1_4_1) {
5025 Maxlibjsigsigs = OLDMAXSIGNUM;
5026 }
5027
5028 // initialize synchronization primitives to use either thread or
5029 // lwp synchronization (controlled by UseLWPSynchronization)
5030 Solaris::synchronization_init();
5031
5032 if (MaxFDLimit) {
5033 // set the number of file descriptors to max. print out error
5034 // if getrlimit/setrlimit fails but continue regardless.
5035 struct rlimit nbr_files;
5036 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
5037 if (status != 0) {
5038 if (PrintMiscellaneous && (Verbose || WizardMode))
5039 perror("os::init_2 getrlimit failed");
5040 } else {
5041 nbr_files.rlim_cur = nbr_files.rlim_max;
5042 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
5043 if (status != 0) {
5044 if (PrintMiscellaneous && (Verbose || WizardMode))
5045 perror("os::init_2 setrlimit failed");
5046 }
5047 }
5048 }
5049
5050 // Calculate theoretical max. size of Threads to guard gainst
5051 // artifical out-of-memory situations, where all available address-
5052 // space has been reserved by thread stacks. Default stack size is 1Mb.
5053 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
5054 JavaThread::stack_size_at_create() : (1*K*K);
5055 assert(pre_thread_stack_size != 0, "Must have a stack");
5056 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
5057 // we should start doing Virtual Memory banging. Currently when the threads will
5058 // have used all but 200Mb of space.
5059 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
5060 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
5061
5062 // at-exit methods are called in the reverse order of their registration.
5063 // In Solaris 7 and earlier, atexit functions are called on return from
5064 // main or as a result of a call to exit(3C). There can be only 32 of
5065 // these functions registered and atexit() does not set errno. In Solaris
5066 // 8 and later, there is no limit to the number of functions registered
5067 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
5068 // functions are called upon dlclose(3DL) in addition to return from main
5069 // and exit(3C).
5070
5071 if (PerfAllowAtExitRegistration) {
5072 // only register atexit functions if PerfAllowAtExitRegistration is set.
5073 // atexit functions can be delayed until process exit time, which
5074 // can be problematic for embedded VM situations. Embedded VMs should
5075 // call DestroyJavaVM() to assure that VM resources are released.
5076
5077 // note: perfMemory_exit_helper atexit function may be removed in
5078 // the future if the appropriate cleanup code can be added to the
5079 // VM_Exit VMOperation's doit method.
5080 if (atexit(perfMemory_exit_helper) != 0) {
5081 warning("os::init2 atexit(perfMemory_exit_helper) failed");
5082 }
5083 }
5084
5085 // Init pset_loadavg function pointer
5086 init_pset_getloadavg_ptr();
5087
5088 return JNI_OK;
5089 }
5090
5091 // Mark the polling page as unreadable
5092 void os::make_polling_page_unreadable(void) {
5093 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 )
5094 fatal("Could not disable polling page");
5095 };
5096
5097 // Mark the polling page as readable
5098 void os::make_polling_page_readable(void) {
5099 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 )
5100 fatal("Could not enable polling page");
5101 };
5102
5103 // OS interface.
5104
5105 bool os::check_heap(bool force) { return true; }
5106
5107 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
5108 static vsnprintf_t sol_vsnprintf = NULL;
5109
5110 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
5111 if (!sol_vsnprintf) {
5112 //search for the named symbol in the objects that were loaded after libjvm
5113 void* where = RTLD_NEXT;
5114 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5115 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5116 if (!sol_vsnprintf){
5117 //search for the named symbol in the objects that were loaded before libjvm
5118 where = RTLD_DEFAULT;
5119 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
5120 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
5121 assert(sol_vsnprintf != NULL, "vsnprintf not found");
5122 }
5123 }
5124 return (*sol_vsnprintf)(buf, count, fmt, argptr);
5125 }
5126
5127
5128 // Is a (classpath) directory empty?
5129 bool os::dir_is_empty(const char* path) {
5130 DIR *dir = NULL;
5131 struct dirent *ptr;
5132
5133 dir = opendir(path);
5134 if (dir == NULL) return true;
5135
5136 /* Scan the directory */
5137 bool result = true;
5138 char buf[sizeof(struct dirent) + MAX_PATH];
5139 struct dirent *dbuf = (struct dirent *) buf;
5140 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
5141 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
5142 result = false;
5143 }
5144 }
5145 closedir(dir);
5146 return result;
5147 }
5148
5149 // This code originates from JDK's sysOpen and open64_w
5150 // from src/solaris/hpi/src/system_md.c
5151
5152 #ifndef O_DELETE
5153 #define O_DELETE 0x10000
5154 #endif
5155
5156 // Open a file. Unlink the file immediately after open returns
5157 // if the specified oflag has the O_DELETE flag set.
5158 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
5159
5160 int os::open(const char *path, int oflag, int mode) {
5161 if (strlen(path) > MAX_PATH - 1) {
5162 errno = ENAMETOOLONG;
5163 return -1;
5164 }
5165 int fd;
5166 int o_delete = (oflag & O_DELETE);
5167 oflag = oflag & ~O_DELETE;
5168
5169 fd = ::open64(path, oflag, mode);
5170 if (fd == -1) return -1;
5171
5172 //If the open succeeded, the file might still be a directory
5173 {
5174 struct stat64 buf64;
5175 int ret = ::fstat64(fd, &buf64);
5176 int st_mode = buf64.st_mode;
5177
5178 if (ret != -1) {
5179 if ((st_mode & S_IFMT) == S_IFDIR) {
5180 errno = EISDIR;
5181 ::close(fd);
5182 return -1;
5183 }
5184 } else {
5185 ::close(fd);
5186 return -1;
5187 }
5188 }
5189 /*
5190 * 32-bit Solaris systems suffer from:
5191 *
5192 * - an historical default soft limit of 256 per-process file
5193 * descriptors that is too low for many Java programs.
5194 *
5195 * - a design flaw where file descriptors created using stdio
5196 * fopen must be less than 256, _even_ when the first limit above
5197 * has been raised. This can cause calls to fopen (but not calls to
5198 * open, for example) to fail mysteriously, perhaps in 3rd party
5199 * native code (although the JDK itself uses fopen). One can hardly
5200 * criticize them for using this most standard of all functions.
5201 *
5202 * We attempt to make everything work anyways by:
5203 *
5204 * - raising the soft limit on per-process file descriptors beyond
5205 * 256
5206 *
5207 * - As of Solaris 10u4, we can request that Solaris raise the 256
5208 * stdio fopen limit by calling function enable_extended_FILE_stdio.
5209 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
5210 *
5211 * - If we are stuck on an old (pre 10u4) Solaris system, we can
5212 * workaround the bug by remapping non-stdio file descriptors below
5213 * 256 to ones beyond 256, which is done below.
5214 *
5215 * See:
5216 * 1085341: 32-bit stdio routines should support file descriptors >255
5217 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
5218 * 6431278: Netbeans crash on 32 bit Solaris: need to call
5219 * enable_extended_FILE_stdio() in VM initialisation
5220 * Giri Mandalika's blog
5221 * http://technopark02.blogspot.com/2005_05_01_archive.html
5222 */
5223 #ifndef _LP64
5224 if ((!enabled_extended_FILE_stdio) && fd < 256) {
5225 int newfd = ::fcntl(fd, F_DUPFD, 256);
5226 if (newfd != -1) {
5227 ::close(fd);
5228 fd = newfd;
5229 }
5230 }
5231 #endif // 32-bit Solaris
5232 /*
5233 * All file descriptors that are opened in the JVM and not
5234 * specifically destined for a subprocess should have the
5235 * close-on-exec flag set. If we don't set it, then careless 3rd
5236 * party native code might fork and exec without closing all
5237 * appropriate file descriptors (e.g. as we do in closeDescriptors in
5238 * UNIXProcess.c), and this in turn might:
5239 *
5240 * - cause end-of-file to fail to be detected on some file
5241 * descriptors, resulting in mysterious hangs, or
5242 *
5243 * - might cause an fopen in the subprocess to fail on a system
5244 * suffering from bug 1085341.
5245 *
5246 * (Yes, the default setting of the close-on-exec flag is a Unix
5247 * design flaw)
5248 *
5249 * See:
5250 * 1085341: 32-bit stdio routines should support file descriptors >255
5251 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
5252 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
5253 */
5254 #ifdef FD_CLOEXEC
5255 {
5256 int flags = ::fcntl(fd, F_GETFD);
5257 if (flags != -1)
5258 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
5259 }
5260 #endif
5261
5262 if (o_delete != 0) {
5263 ::unlink(path);
5264 }
5265 return fd;
5266 }
5267
5268 // create binary file, rewriting existing file if required
5269 int os::create_binary_file(const char* path, bool rewrite_existing) {
5270 int oflags = O_WRONLY | O_CREAT;
5271 if (!rewrite_existing) {
5272 oflags |= O_EXCL;
5273 }
5274 return ::open64(path, oflags, S_IREAD | S_IWRITE);
5275 }
5276
5277 // return current position of file pointer
5278 jlong os::current_file_offset(int fd) {
5279 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
5280 }
5281
5282 // move file pointer to the specified offset
5283 jlong os::seek_to_file_offset(int fd, jlong offset) {
5284 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
5285 }
5286
5287 jlong os::lseek(int fd, jlong offset, int whence) {
5288 return (jlong) ::lseek64(fd, offset, whence);
5289 }
5290
5291 char * os::native_path(char *path) {
5292 return path;
5293 }
5294
5295 int os::ftruncate(int fd, jlong length) {
5296 return ::ftruncate64(fd, length);
5297 }
5298
5299 int os::fsync(int fd) {
5300 RESTARTABLE_RETURN_INT(::fsync(fd));
5301 }
5302
5303 int os::available(int fd, jlong *bytes) {
5304 jlong cur, end;
5305 int mode;
5306 struct stat64 buf64;
5307
5308 if (::fstat64(fd, &buf64) >= 0) {
5309 mode = buf64.st_mode;
5310 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
5311 /*
5312 * XXX: is the following call interruptible? If so, this might
5313 * need to go through the INTERRUPT_IO() wrapper as for other
5314 * blocking, interruptible calls in this file.
5315 */
5316 int n,ioctl_return;
5317
5318 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted);
5319 if (ioctl_return>= 0) {
5320 *bytes = n;
5321 return 1;
5322 }
5323 }
5324 }
5325 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
5326 return 0;
5327 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
5328 return 0;
5329 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
5330 return 0;
5331 }
5332 *bytes = end - cur;
5333 return 1;
5334 }
5335
5336 // Map a block of memory.
5337 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
5338 char *addr, size_t bytes, bool read_only,
5339 bool allow_exec) {
5340 int prot;
5341 int flags;
5342
5343 if (read_only) {
5344 prot = PROT_READ;
5345 flags = MAP_SHARED;
5346 } else {
5347 prot = PROT_READ | PROT_WRITE;
5348 flags = MAP_PRIVATE;
5349 }
5350
5351 if (allow_exec) {
5352 prot |= PROT_EXEC;
5353 }
5354
5355 if (addr != NULL) {
5356 flags |= MAP_FIXED;
5357 }
5358
5359 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
5360 fd, file_offset);
5361 if (mapped_address == MAP_FAILED) {
5362 return NULL;
5363 }
5364 return mapped_address;
5365 }
5366
5367
5368 // Remap a block of memory.
5369 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5370 char *addr, size_t bytes, bool read_only,
5371 bool allow_exec) {
5372 // same as map_memory() on this OS
5373 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5374 allow_exec);
5375 }
5376
5377
5378 // Unmap a block of memory.
5379 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5380 return munmap(addr, bytes) == 0;
5381 }
5382
5383 void os::pause() {
5384 char filename[MAX_PATH];
5385 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5386 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5387 } else {
5388 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5389 }
5390
5391 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5392 if (fd != -1) {
5393 struct stat buf;
5394 ::close(fd);
5395 while (::stat(filename, &buf) == 0) {
5396 (void)::poll(NULL, 0, 100);
5397 }
5398 } else {
5399 jio_fprintf(stderr,
5400 "Could not open pause file '%s', continuing immediately.\n", filename);
5401 }
5402 }
5403
5404 #ifndef PRODUCT
5405 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5406 // Turn this on if you need to trace synch operations.
5407 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5408 // and call record_synch_enable and record_synch_disable
5409 // around the computation of interest.
5410
5411 void record_synch(char* name, bool returning); // defined below
5412
5413 class RecordSynch {
5414 char* _name;
5415 public:
5416 RecordSynch(char* name) :_name(name)
5417 { record_synch(_name, false); }
5418 ~RecordSynch() { record_synch(_name, true); }
5419 };
5420
5421 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5422 extern "C" ret name params { \
5423 typedef ret name##_t params; \
5424 static name##_t* implem = NULL; \
5425 static int callcount = 0; \
5426 if (implem == NULL) { \
5427 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5428 if (implem == NULL) fatal(dlerror()); \
5429 } \
5430 ++callcount; \
5431 RecordSynch _rs(#name); \
5432 inner; \
5433 return implem args; \
5434 }
5435 // in dbx, examine callcounts this way:
5436 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5437
5438 #define CHECK_POINTER_OK(p) \
5439 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5440 #define CHECK_MU \
5441 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5442 #define CHECK_CV \
5443 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5444 #define CHECK_P(p) \
5445 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5446
5447 #define CHECK_MUTEX(mutex_op) \
5448 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5449
5450 CHECK_MUTEX( mutex_lock)
5451 CHECK_MUTEX( _mutex_lock)
5452 CHECK_MUTEX( mutex_unlock)
5453 CHECK_MUTEX(_mutex_unlock)
5454 CHECK_MUTEX( mutex_trylock)
5455 CHECK_MUTEX(_mutex_trylock)
5456
5457 #define CHECK_COND(cond_op) \
5458 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5459
5460 CHECK_COND( cond_wait);
5461 CHECK_COND(_cond_wait);
5462 CHECK_COND(_cond_wait_cancel);
5463
5464 #define CHECK_COND2(cond_op) \
5465 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5466
5467 CHECK_COND2( cond_timedwait);
5468 CHECK_COND2(_cond_timedwait);
5469 CHECK_COND2(_cond_timedwait_cancel);
5470
5471 // do the _lwp_* versions too
5472 #define mutex_t lwp_mutex_t
5473 #define cond_t lwp_cond_t
5474 CHECK_MUTEX( _lwp_mutex_lock)
5475 CHECK_MUTEX( _lwp_mutex_unlock)
5476 CHECK_MUTEX( _lwp_mutex_trylock)
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
5483 CHECK_COND( _lwp_cond_wait);
5484 CHECK_COND( __lwp_cond_wait);
5485 CHECK_COND(___lwp_cond_wait);
5486
5487 CHECK_COND2( _lwp_cond_timedwait);
5488 CHECK_COND2( __lwp_cond_timedwait);
5489 #undef mutex_t
5490 #undef cond_t
5491
5492 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5493 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5494 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5495 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5496 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5497 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5498 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5499 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5500
5501
5502 // recording machinery:
5503
5504 enum { RECORD_SYNCH_LIMIT = 200 };
5505 char* record_synch_name[RECORD_SYNCH_LIMIT];
5506 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5507 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5508 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5509 int record_synch_count = 0;
5510 bool record_synch_enabled = false;
5511
5512 // in dbx, examine recorded data this way:
5513 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5514
5515 void record_synch(char* name, bool returning) {
5516 if (record_synch_enabled) {
5517 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5518 record_synch_name[record_synch_count] = name;
5519 record_synch_returning[record_synch_count] = returning;
5520 record_synch_thread[record_synch_count] = thr_self();
5521 record_synch_arg0ptr[record_synch_count] = &name;
5522 record_synch_count++;
5523 }
5524 // put more checking code here:
5525 // ...
5526 }
5527 }
5528
5529 void record_synch_enable() {
5530 // start collecting trace data, if not already doing so
5531 if (!record_synch_enabled) record_synch_count = 0;
5532 record_synch_enabled = true;
5533 }
5534
5535 void record_synch_disable() {
5536 // stop collecting trace data
5537 record_synch_enabled = false;
5538 }
5539
5540 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5541 #endif // PRODUCT
5542
5543 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5544 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5545 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5546
5547
5548 // JVMTI & JVM monitoring and management support
5549 // The thread_cpu_time() and current_thread_cpu_time() are only
5550 // supported if is_thread_cpu_time_supported() returns true.
5551 // They are not supported on Solaris T1.
5552
5553 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5554 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5555 // of a thread.
5556 //
5557 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5558 // returns the fast estimate available on the platform.
5559
5560 // hrtime_t gethrvtime() return value includes
5561 // user time but does not include system time
5562 jlong os::current_thread_cpu_time() {
5563 return (jlong) gethrvtime();
5564 }
5565
5566 jlong os::thread_cpu_time(Thread *thread) {
5567 // return user level CPU time only to be consistent with
5568 // what current_thread_cpu_time returns.
5569 // thread_cpu_time_info() must be changed if this changes
5570 return os::thread_cpu_time(thread, false /* user time only */);
5571 }
5572
5573 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5574 if (user_sys_cpu_time) {
5575 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5576 } else {
5577 return os::current_thread_cpu_time();
5578 }
5579 }
5580
5581 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5582 char proc_name[64];
5583 int count;
5584 prusage_t prusage;
5585 jlong lwp_time;
5586 int fd;
5587
5588 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5589 getpid(),
5590 thread->osthread()->lwp_id());
5591 fd = ::open(proc_name, O_RDONLY);
5592 if ( fd == -1 ) return -1;
5593
5594 do {
5595 count = ::pread(fd,
5596 (void *)&prusage.pr_utime,
5597 thr_time_size,
5598 thr_time_off);
5599 } while (count < 0 && errno == EINTR);
5600 ::close(fd);
5601 if ( count < 0 ) return -1;
5602
5603 if (user_sys_cpu_time) {
5604 // user + system CPU time
5605 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5606 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5607 (jlong)prusage.pr_stime.tv_nsec +
5608 (jlong)prusage.pr_utime.tv_nsec;
5609 } else {
5610 // user level CPU time only
5611 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5612 (jlong)prusage.pr_utime.tv_nsec;
5613 }
5614
5615 return(lwp_time);
5616 }
5617
5618 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5619 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5620 info_ptr->may_skip_backward = false; // elapsed time not wall time
5621 info_ptr->may_skip_forward = false; // elapsed time not wall time
5622 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5623 }
5624
5625 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5626 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5627 info_ptr->may_skip_backward = false; // elapsed time not wall time
5628 info_ptr->may_skip_forward = false; // elapsed time not wall time
5629 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5630 }
5631
5632 bool os::is_thread_cpu_time_supported() {
5633 if ( os::Solaris::T2_libthread() || UseBoundThreads ) {
5634 return true;
5635 } else {
5636 return false;
5637 }
5638 }
5639
5640 // System loadavg support. Returns -1 if load average cannot be obtained.
5641 // Return the load average for our processor set if the primitive exists
5642 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5643 int os::loadavg(double loadavg[], int nelem) {
5644 if (pset_getloadavg_ptr != NULL) {
5645 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5646 } else {
5647 return ::getloadavg(loadavg, nelem);
5648 }
5649 }
5650
5651 //---------------------------------------------------------------------------------
5652
5653 bool os::find(address addr, outputStream* st) {
5654 Dl_info dlinfo;
5655 memset(&dlinfo, 0, sizeof(dlinfo));
5656 if (dladdr(addr, &dlinfo) != 0) {
5657 st->print(PTR_FORMAT ": ", addr);
5658 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5659 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5660 } else if (dlinfo.dli_fbase != NULL)
5661 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5662 else
5663 st->print("<absolute address>");
5664 if (dlinfo.dli_fname != NULL) {
5665 st->print(" in %s", dlinfo.dli_fname);
5666 }
5667 if (dlinfo.dli_fbase != NULL) {
5668 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5669 }
5670 st->cr();
5671
5672 if (Verbose) {
5673 // decode some bytes around the PC
5674 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5675 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5676 address lowest = (address) dlinfo.dli_sname;
5677 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5678 if (begin < lowest) begin = lowest;
5679 Dl_info dlinfo2;
5680 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5681 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5682 end = (address) dlinfo2.dli_saddr;
5683 Disassembler::decode(begin, end, st);
5684 }
5685 return true;
5686 }
5687 return false;
5688 }
5689
5690 // Following function has been added to support HotSparc's libjvm.so running
5691 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5692 // src/solaris/hpi/native_threads in the EVM codebase.
5693 //
5694 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5695 // libraries and should thus be removed. We will leave it behind for a while
5696 // until we no longer want to able to run on top of 1.3.0 Solaris production
5697 // JDK. See 4341971.
5698
5699 #define STACK_SLACK 0x800
5700
5701 extern "C" {
5702 intptr_t sysThreadAvailableStackWithSlack() {
5703 stack_t st;
5704 intptr_t retval, stack_top;
5705 retval = thr_stksegment(&st);
5706 assert(retval == 0, "incorrect return value from thr_stksegment");
5707 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5708 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5709 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5710 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5711 }
5712 }
5713
5714 // ObjectMonitor park-unpark infrastructure ...
5715 //
5716 // We implement Solaris and Linux PlatformEvents with the
5717 // obvious condvar-mutex-flag triple.
5718 // Another alternative that works quite well is pipes:
5719 // Each PlatformEvent consists of a pipe-pair.
5720 // The thread associated with the PlatformEvent
5721 // calls park(), which reads from the input end of the pipe.
5722 // Unpark() writes into the other end of the pipe.
5723 // The write-side of the pipe must be set NDELAY.
5724 // Unfortunately pipes consume a large # of handles.
5725 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5726 // Using pipes for the 1st few threads might be workable, however.
5727 //
5728 // park() is permitted to return spuriously.
5729 // Callers of park() should wrap the call to park() in
5730 // an appropriate loop. A litmus test for the correct
5731 // usage of park is the following: if park() were modified
5732 // to immediately return 0 your code should still work,
5733 // albeit degenerating to a spin loop.
5734 //
5735 // An interesting optimization for park() is to use a trylock()
5736 // to attempt to acquire the mutex. If the trylock() fails
5737 // then we know that a concurrent unpark() operation is in-progress.
5738 // in that case the park() code could simply set _count to 0
5739 // and return immediately. The subsequent park() operation *might*
5740 // return immediately. That's harmless as the caller of park() is
5741 // expected to loop. By using trylock() we will have avoided a
5742 // avoided a context switch caused by contention on the per-thread mutex.
5743 //
5744 // TODO-FIXME:
5745 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5746 // objectmonitor implementation.
5747 // 2. Collapse the JSR166 parker event, and the
5748 // objectmonitor ParkEvent into a single "Event" construct.
5749 // 3. In park() and unpark() add:
5750 // assert (Thread::current() == AssociatedWith).
5751 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5752 // 1-out-of-N park() operations will return immediately.
5753 //
5754 // _Event transitions in park()
5755 // -1 => -1 : illegal
5756 // 1 => 0 : pass - return immediately
5757 // 0 => -1 : block
5758 //
5759 // _Event serves as a restricted-range semaphore.
5760 //
5761 // Another possible encoding of _Event would be with
5762 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5763 //
5764 // TODO-FIXME: add DTRACE probes for:
5765 // 1. Tx parks
5766 // 2. Ty unparks Tx
5767 // 3. Tx resumes from park
5768
5769
5770 // value determined through experimentation
5771 #define ROUNDINGFIX 11
5772
5773 // utility to compute the abstime argument to timedwait.
5774 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5775
5776 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5777 // millis is the relative timeout time
5778 // abstime will be the absolute timeout time
5779 if (millis < 0) millis = 0;
5780 struct timeval now;
5781 int status = gettimeofday(&now, NULL);
5782 assert(status == 0, "gettimeofday");
5783 jlong seconds = millis / 1000;
5784 jlong max_wait_period;
5785
5786 if (UseLWPSynchronization) {
5787 // forward port of fix for 4275818 (not sleeping long enough)
5788 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5789 // _lwp_cond_timedwait() used a round_down algorithm rather
5790 // than a round_up. For millis less than our roundfactor
5791 // it rounded down to 0 which doesn't meet the spec.
5792 // For millis > roundfactor we may return a bit sooner, but
5793 // since we can not accurately identify the patch level and
5794 // this has already been fixed in Solaris 9 and 8 we will
5795 // leave it alone rather than always rounding down.
5796
5797 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5798 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5799 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5800 max_wait_period = 21000000;
5801 } else {
5802 max_wait_period = 50000000;
5803 }
5804 millis %= 1000;
5805 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5806 seconds = max_wait_period;
5807 }
5808 abstime->tv_sec = now.tv_sec + seconds;
5809 long usec = now.tv_usec + millis * 1000;
5810 if (usec >= 1000000) {
5811 abstime->tv_sec += 1;
5812 usec -= 1000000;
5813 }
5814 abstime->tv_nsec = usec * 1000;
5815 return abstime;
5816 }
5817
5818 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5819 // Conceptually TryPark() should be equivalent to park(0).
5820
5821 int os::PlatformEvent::TryPark() {
5822 for (;;) {
5823 const int v = _Event ;
5824 guarantee ((v == 0) || (v == 1), "invariant") ;
5825 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ;
5826 }
5827 }
5828
5829 void os::PlatformEvent::park() { // AKA: down()
5830 // Invariant: Only the thread associated with the Event/PlatformEvent
5831 // may call park().
5832 int v ;
5833 for (;;) {
5834 v = _Event ;
5835 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5836 }
5837 guarantee (v >= 0, "invariant") ;
5838 if (v == 0) {
5839 // Do this the hard way by blocking ...
5840 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5841 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5842 // Only for SPARC >= V8PlusA
5843 #if defined(__sparc) && defined(COMPILER2)
5844 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5845 #endif
5846 int status = os::Solaris::mutex_lock(_mutex);
5847 assert_status(status == 0, status, "mutex_lock");
5848 guarantee (_nParked == 0, "invariant") ;
5849 ++ _nParked ;
5850 while (_Event < 0) {
5851 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5852 // Treat this the same as if the wait was interrupted
5853 // With usr/lib/lwp going to kernel, always handle ETIME
5854 status = os::Solaris::cond_wait(_cond, _mutex);
5855 if (status == ETIME) status = EINTR ;
5856 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5857 }
5858 -- _nParked ;
5859 _Event = 0 ;
5860 status = os::Solaris::mutex_unlock(_mutex);
5861 assert_status(status == 0, status, "mutex_unlock");
5862 // Paranoia to ensure our locked and lock-free paths interact
5863 // correctly with each other.
5864 OrderAccess::fence();
5865 }
5866 }
5867
5868 int os::PlatformEvent::park(jlong millis) {
5869 guarantee (_nParked == 0, "invariant") ;
5870 int v ;
5871 for (;;) {
5872 v = _Event ;
5873 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ;
5874 }
5875 guarantee (v >= 0, "invariant") ;
5876 if (v != 0) return OS_OK ;
5877
5878 int ret = OS_TIMEOUT;
5879 timestruc_t abst;
5880 compute_abstime (&abst, millis);
5881
5882 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5883 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5884 // Only for SPARC >= V8PlusA
5885 #if defined(__sparc) && defined(COMPILER2)
5886 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
5887 #endif
5888 int status = os::Solaris::mutex_lock(_mutex);
5889 assert_status(status == 0, status, "mutex_lock");
5890 guarantee (_nParked == 0, "invariant") ;
5891 ++ _nParked ;
5892 while (_Event < 0) {
5893 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5894 assert_status(status == 0 || status == EINTR ||
5895 status == ETIME || status == ETIMEDOUT,
5896 status, "cond_timedwait");
5897 if (!FilterSpuriousWakeups) break ; // previous semantics
5898 if (status == ETIME || status == ETIMEDOUT) break ;
5899 // We consume and ignore EINTR and spurious wakeups.
5900 }
5901 -- _nParked ;
5902 if (_Event >= 0) ret = OS_OK ;
5903 _Event = 0 ;
5904 status = os::Solaris::mutex_unlock(_mutex);
5905 assert_status(status == 0, status, "mutex_unlock");
5906 // Paranoia to ensure our locked and lock-free paths interact
5907 // correctly with each other.
5908 OrderAccess::fence();
5909 return ret;
5910 }
5911
5912 void os::PlatformEvent::unpark() {
5913 // Transitions for _Event:
5914 // 0 :=> 1
5915 // 1 :=> 1
5916 // -1 :=> either 0 or 1; must signal target thread
5917 // That is, we can safely transition _Event from -1 to either
5918 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
5919 // unpark() calls.
5920 // See also: "Semaphores in Plan 9" by Mullender & Cox
5921 //
5922 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5923 // that it will take two back-to-back park() calls for the owning
5924 // thread to block. This has the benefit of forcing a spurious return
5925 // from the first park() call after an unpark() call which will help
5926 // shake out uses of park() and unpark() without condition variables.
5927
5928 if (Atomic::xchg(1, &_Event) >= 0) return;
5929
5930 // If the thread associated with the event was parked, wake it.
5931 // Wait for the thread assoc with the PlatformEvent to vacate.
5932 int status = os::Solaris::mutex_lock(_mutex);
5933 assert_status(status == 0, status, "mutex_lock");
5934 int AnyWaiters = _nParked;
5935 status = os::Solaris::mutex_unlock(_mutex);
5936 assert_status(status == 0, status, "mutex_unlock");
5937 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5938 if (AnyWaiters != 0) {
5939 // We intentional signal *after* dropping the lock
5940 // to avoid a common class of futile wakeups.
5941 status = os::Solaris::cond_signal(_cond);
5942 assert_status(status == 0, status, "cond_signal");
5943 }
5944 }
5945
5946 // JSR166
5947 // -------------------------------------------------------
5948
5949 /*
5950 * The solaris and linux implementations of park/unpark are fairly
5951 * conservative for now, but can be improved. They currently use a
5952 * mutex/condvar pair, plus _counter.
5953 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5954 * sets count to 1 and signals condvar. Only one thread ever waits
5955 * on the condvar. Contention seen when trying to park implies that someone
5956 * is unparking you, so don't wait. And spurious returns are fine, so there
5957 * is no need to track notifications.
5958 */
5959
5960 #define MAX_SECS 100000000
5961 /*
5962 * This code is common to linux and solaris and will be moved to a
5963 * common place in dolphin.
5964 *
5965 * The passed in time value is either a relative time in nanoseconds
5966 * or an absolute time in milliseconds. Either way it has to be unpacked
5967 * into suitable seconds and nanoseconds components and stored in the
5968 * given timespec structure.
5969 * Given time is a 64-bit value and the time_t used in the timespec is only
5970 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5971 * overflow if times way in the future are given. Further on Solaris versions
5972 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5973 * number of seconds, in abstime, is less than current_time + 100,000,000.
5974 * As it will be 28 years before "now + 100000000" will overflow we can
5975 * ignore overflow and just impose a hard-limit on seconds using the value
5976 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5977 * years from "now".
5978 */
5979 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5980 assert (time > 0, "convertTime");
5981
5982 struct timeval now;
5983 int status = gettimeofday(&now, NULL);
5984 assert(status == 0, "gettimeofday");
5985
5986 time_t max_secs = now.tv_sec + MAX_SECS;
5987
5988 if (isAbsolute) {
5989 jlong secs = time / 1000;
5990 if (secs > max_secs) {
5991 absTime->tv_sec = max_secs;
5992 }
5993 else {
5994 absTime->tv_sec = secs;
5995 }
5996 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5997 }
5998 else {
5999 jlong secs = time / NANOSECS_PER_SEC;
6000 if (secs >= MAX_SECS) {
6001 absTime->tv_sec = max_secs;
6002 absTime->tv_nsec = 0;
6003 }
6004 else {
6005 absTime->tv_sec = now.tv_sec + secs;
6006 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
6007 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
6008 absTime->tv_nsec -= NANOSECS_PER_SEC;
6009 ++absTime->tv_sec; // note: this must be <= max_secs
6010 }
6011 }
6012 }
6013 assert(absTime->tv_sec >= 0, "tv_sec < 0");
6014 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
6015 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
6016 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
6017 }
6018
6019 void Parker::park(bool isAbsolute, jlong time) {
6020 // Ideally we'd do something useful while spinning, such
6021 // as calling unpackTime().
6022
6023 // Optional fast-path check:
6024 // Return immediately if a permit is available.
6025 // We depend on Atomic::xchg() having full barrier semantics
6026 // since we are doing a lock-free update to _counter.
6027 if (Atomic::xchg(0, &_counter) > 0) return;
6028
6029 // Optional fast-exit: Check interrupt before trying to wait
6030 Thread* thread = Thread::current();
6031 assert(thread->is_Java_thread(), "Must be JavaThread");
6032 JavaThread *jt = (JavaThread *)thread;
6033 if (Thread::is_interrupted(thread, false)) {
6034 return;
6035 }
6036
6037 // First, demultiplex/decode time arguments
6038 timespec absTime;
6039 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all
6040 return;
6041 }
6042 if (time > 0) {
6043 // Warning: this code might be exposed to the old Solaris time
6044 // round-down bugs. Grep "roundingFix" for details.
6045 unpackTime(&absTime, isAbsolute, time);
6046 }
6047
6048 // Enter safepoint region
6049 // Beware of deadlocks such as 6317397.
6050 // The per-thread Parker:: _mutex is a classic leaf-lock.
6051 // In particular a thread must never block on the Threads_lock while
6052 // holding the Parker:: mutex. If safepoints are pending both the
6053 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
6054 ThreadBlockInVM tbivm(jt);
6055
6056 // Don't wait if cannot get lock since interference arises from
6057 // unblocking. Also. check interrupt before trying wait
6058 if (Thread::is_interrupted(thread, false) ||
6059 os::Solaris::mutex_trylock(_mutex) != 0) {
6060 return;
6061 }
6062
6063 int status ;
6064
6065 if (_counter > 0) { // no wait needed
6066 _counter = 0;
6067 status = os::Solaris::mutex_unlock(_mutex);
6068 assert (status == 0, "invariant") ;
6069 // Paranoia to ensure our locked and lock-free paths interact
6070 // correctly with each other and Java-level accesses.
6071 OrderAccess::fence();
6072 return;
6073 }
6074
6075 #ifdef ASSERT
6076 // Don't catch signals while blocked; let the running threads have the signals.
6077 // (This allows a debugger to break into the running thread.)
6078 sigset_t oldsigs;
6079 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
6080 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
6081 #endif
6082
6083 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
6084 jt->set_suspend_equivalent();
6085 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
6086
6087 // Do this the hard way by blocking ...
6088 // See http://monaco.sfbay/detail.jsf?cr=5094058.
6089 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
6090 // Only for SPARC >= V8PlusA
6091 #if defined(__sparc) && defined(COMPILER2)
6092 if (ClearFPUAtPark) { _mark_fpu_nosave() ; }
6093 #endif
6094
6095 if (time == 0) {
6096 status = os::Solaris::cond_wait (_cond, _mutex) ;
6097 } else {
6098 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
6099 }
6100 // Note that an untimed cond_wait() can sometimes return ETIME on older
6101 // versions of the Solaris.
6102 assert_status(status == 0 || status == EINTR ||
6103 status == ETIME || status == ETIMEDOUT,
6104 status, "cond_timedwait");
6105
6106 #ifdef ASSERT
6107 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
6108 #endif
6109 _counter = 0 ;
6110 status = os::Solaris::mutex_unlock(_mutex);
6111 assert_status(status == 0, status, "mutex_unlock") ;
6112 // Paranoia to ensure our locked and lock-free paths interact
6113 // correctly with each other and Java-level accesses.
6114 OrderAccess::fence();
6115
6116 // If externally suspended while waiting, re-suspend
6117 if (jt->handle_special_suspend_equivalent_condition()) {
6118 jt->java_suspend_self();
6119 }
6120 }
6121
6122 void Parker::unpark() {
6123 int s, status ;
6124 status = os::Solaris::mutex_lock (_mutex) ;
6125 assert (status == 0, "invariant") ;
6126 s = _counter;
6127 _counter = 1;
6128 status = os::Solaris::mutex_unlock (_mutex) ;
6129 assert (status == 0, "invariant") ;
6130
6131 if (s < 1) {
6132 status = os::Solaris::cond_signal (_cond) ;
6133 assert (status == 0, "invariant") ;
6134 }
6135 }
6136
6137 extern char** environ;
6138
6139 // Run the specified command in a separate process. Return its exit value,
6140 // or -1 on failure (e.g. can't fork a new process).
6141 // Unlike system(), this function can be called from signal handler. It
6142 // doesn't block SIGINT et al.
6143 int os::fork_and_exec(char* cmd) {
6144 char * argv[4];
6145 argv[0] = (char *)"sh";
6146 argv[1] = (char *)"-c";
6147 argv[2] = cmd;
6148 argv[3] = NULL;
6149
6150 // fork is async-safe, fork1 is not so can't use in signal handler
6151 pid_t pid;
6152 Thread* t = ThreadLocalStorage::get_thread_slow();
6153 if (t != NULL && t->is_inside_signal_handler()) {
6154 pid = fork();
6155 } else {
6156 pid = fork1();
6157 }
6158
6159 if (pid < 0) {
6160 // fork failed
6161 warning("fork failed: %s", strerror(errno));
6162 return -1;
6163
6164 } else if (pid == 0) {
6165 // child process
6166
6167 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
6168 execve("/usr/bin/sh", argv, environ);
6169
6170 // execve failed
6171 _exit(-1);
6172
6173 } else {
6174 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
6175 // care about the actual exit code, for now.
6176
6177 int status;
6178
6179 // Wait for the child process to exit. This returns immediately if
6180 // the child has already exited. */
6181 while (waitpid(pid, &status, 0) < 0) {
6182 switch (errno) {
6183 case ECHILD: return 0;
6184 case EINTR: break;
6185 default: return -1;
6186 }
6187 }
6188
6189 if (WIFEXITED(status)) {
6190 // The child exited normally; get its exit code.
6191 return WEXITSTATUS(status);
6192 } else if (WIFSIGNALED(status)) {
6193 // The child exited because of a signal
6194 // The best value to return is 0x80 + signal number,
6195 // because that is what all Unix shells do, and because
6196 // it allows callers to distinguish between process exit and
6197 // process death by signal.
6198 return 0x80 + WTERMSIG(status);
6199 } else {
6200 // Unknown exit code; pass it through
6201 return status;
6202 }
6203 }
6204 }
6205
6206 // is_headless_jre()
6207 //
6208 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
6209 // in order to report if we are running in a headless jre
6210 //
6211 // Since JDK8 xawt/libmawt.so was moved into the same directory
6212 // as libawt.so, and renamed libawt_xawt.so
6213 //
6214 bool os::is_headless_jre() {
6215 struct stat statbuf;
6216 char buf[MAXPATHLEN];
6217 char libmawtpath[MAXPATHLEN];
6218 const char *xawtstr = "/xawt/libmawt.so";
6219 const char *new_xawtstr = "/libawt_xawt.so";
6220 char *p;
6221
6222 // Get path to libjvm.so
6223 os::jvm_path(buf, sizeof(buf));
6224
6225 // Get rid of libjvm.so
6226 p = strrchr(buf, '/');
6227 if (p == NULL) return false;
6228 else *p = '\0';
6229
6230 // Get rid of client or server
6231 p = strrchr(buf, '/');
6232 if (p == NULL) return false;
6233 else *p = '\0';
6234
6235 // check xawt/libmawt.so
6236 strcpy(libmawtpath, buf);
6237 strcat(libmawtpath, xawtstr);
6238 if (::stat(libmawtpath, &statbuf) == 0) return false;
6239
6240 // check libawt_xawt.so
6241 strcpy(libmawtpath, buf);
6242 strcat(libmawtpath, new_xawtstr);
6243 if (::stat(libmawtpath, &statbuf) == 0) return false;
6244
6245 return true;
6246 }
6247
6248 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
6249 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted);
6250 }
6251
6252 int os::close(int fd) {
6253 return ::close(fd);
6254 }
6255
6256 int os::socket_close(int fd) {
6257 return ::close(fd);
6258 }
6259
6260 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
6261 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6262 }
6263
6264 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
6265 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted);
6266 }
6267
6268 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
6269 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
6270 }
6271
6272 // As both poll and select can be interrupted by signals, we have to be
6273 // prepared to restart the system call after updating the timeout, unless
6274 // a poll() is done with timeout == -1, in which case we repeat with this
6275 // "wait forever" value.
6276
6277 int os::timeout(int fd, long timeout) {
6278 int res;
6279 struct timeval t;
6280 julong prevtime, newtime;
6281 static const char* aNull = 0;
6282 struct pollfd pfd;
6283 pfd.fd = fd;
6284 pfd.events = POLLIN;
6285
6286 gettimeofday(&t, &aNull);
6287 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
6288
6289 for(;;) {
6290 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted);
6291 if(res == OS_ERR && errno == EINTR) {
6292 if(timeout != -1) {
6293 gettimeofday(&t, &aNull);
6294 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
6295 timeout -= newtime - prevtime;
6296 if(timeout <= 0)
6297 return OS_OK;
6298 prevtime = newtime;
6299 }
6300 } else return res;
6301 }
6302 }
6303
6304 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
6305 int _result;
6306 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\
6307 os::Solaris::clear_interrupted);
6308
6309 // Depending on when thread interruption is reset, _result could be
6310 // one of two values when errno == EINTR
6311
6312 if (((_result == OS_INTRPT) || (_result == OS_ERR))
6313 && (errno == EINTR)) {
6314 /* restarting a connect() changes its errno semantics */
6315 INTERRUPTIBLE(::connect(fd, him, len), _result,\
6316 os::Solaris::clear_interrupted);
6317 /* undo these changes */
6318 if (_result == OS_ERR) {
6319 if (errno == EALREADY) {
6320 errno = EINPROGRESS; /* fall through */
6321 } else if (errno == EISCONN) {
6322 errno = 0;
6323 return OS_OK;
6324 }
6325 }
6326 }
6327 return _result;
6328 }
6329
6330 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
6331 if (fd < 0) {
6332 return OS_ERR;
6333 }
6334 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\
6335 os::Solaris::clear_interrupted);
6336 }
6337
6338 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
6339 sockaddr* from, socklen_t* fromlen) {
6340 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\
6341 os::Solaris::clear_interrupted);
6342 }
6343
6344 int os::sendto(int fd, char* buf, size_t len, uint flags,
6345 struct sockaddr* to, socklen_t tolen) {
6346 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\
6347 os::Solaris::clear_interrupted);
6348 }
6349
6350 int os::socket_available(int fd, jint *pbytes) {
6351 if (fd < 0) {
6352 return OS_OK;
6353 }
6354 int ret;
6355 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6356 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6357 // is expected to return 0 on failure and 1 on success to the jdk.
6358 return (ret == OS_ERR) ? 0 : 1;
6359 }
6360
6361 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6362 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\
6363 os::Solaris::clear_interrupted);
6364 }
6365
6366 // Get the default path to the core file
6367 // Returns the length of the string
6368 int os::get_core_path(char* buffer, size_t bufferSize) {
6369 const char* p = get_current_directory(buffer, bufferSize);
6370
6371 if (p == NULL) {
6372 assert(p != NULL, "failed to get current directory");
6373 return 0;
6374 }
6375
6376 return strlen(buffer);
6377 }
6378
6379 #ifndef PRODUCT
6380 void TestReserveMemorySpecial_test() {
6381 // No tests available for this platform
6382 }
6383 #endif