1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "os_solaris.inline.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/interfaceSupport.inline.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/orderAccess.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/threadCritical.hpp"
60 #include "runtime/timer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "semaphore_posix.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/macros.hpp"
72 #include "utilities/vmError.hpp"
73
74 // put OS-includes here
75 # include <dlfcn.h>
76 # include <errno.h>
77 # include <exception>
78 # include <link.h>
79 # include <poll.h>
80 # include <pthread.h>
81 # include <setjmp.h>
82 # include <signal.h>
83 # include <stdio.h>
84 # include <alloca.h>
85 # include <sys/filio.h>
86 # include <sys/ipc.h>
87 # include <sys/lwp.h>
88 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
89 # include <sys/mman.h>
90 # include <sys/processor.h>
91 # include <sys/procset.h>
92 # include <sys/pset.h>
93 # include <sys/resource.h>
94 # include <sys/shm.h>
95 # include <sys/socket.h>
96 # include <sys/stat.h>
97 # include <sys/systeminfo.h>
98 # include <sys/time.h>
99 # include <sys/times.h>
100 # include <sys/types.h>
101 # include <sys/wait.h>
102 # include <sys/utsname.h>
103 # include <thread.h>
104 # include <unistd.h>
105 # include <sys/priocntl.h>
106 # include <sys/rtpriocntl.h>
107 # include <sys/tspriocntl.h>
108 # include <sys/iapriocntl.h>
109 # include <sys/fxpriocntl.h>
110 # include <sys/loadavg.h>
111 # include <string.h>
112 # include <stdio.h>
113
114 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
115 # include <sys/procfs.h> // see comment in <sys/procfs.h>
116
117 #define MAX_PATH (2 * K)
118
119 // for timer info max values which include all bits
120 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
121
122
123 // Here are some liblgrp types from sys/lgrp_user.h to be able to
124 // compile on older systems without this header file.
125
126 #ifndef MADV_ACCESS_LWP
127 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
128 #endif
129 #ifndef MADV_ACCESS_MANY
130 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
131 #endif
132
133 #ifndef LGRP_RSRC_CPU
134 #define LGRP_RSRC_CPU 0 /* CPU resources */
135 #endif
136 #ifndef LGRP_RSRC_MEM
137 #define LGRP_RSRC_MEM 1 /* memory resources */
138 #endif
139
140 // Values for ThreadPriorityPolicy == 1
141 int prio_policy1[CriticalPriority+1] = {
142 -99999, 0, 16, 32, 48, 64,
143 80, 96, 112, 124, 127, 127 };
144
145 // System parameters used internally
146 static clock_t clock_tics_per_sec = 100;
147
148 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
149 static bool enabled_extended_FILE_stdio = false;
150
151 // For diagnostics to print a message once. see run_periodic_checks
152 static bool check_addr0_done = false;
153 static sigset_t check_signal_done;
154 static bool check_signals = true;
155
156 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
157 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
158
159 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
160
161 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
162
163 // "default" initializers for missing libc APIs
164 extern "C" {
165 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
166 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
167
168 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
169 static int lwp_cond_destroy(cond_t *cv) { return 0; }
170 }
171
172 // "default" initializers for pthread-based synchronization
173 extern "C" {
174 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
175 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
176 }
177
178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
179
180 static inline size_t adjust_stack_size(address base, size_t size) {
181 if ((ssize_t)size < 0) {
182 // 4759953: Compensate for ridiculous stack size.
183 size = max_intx;
184 }
185 if (size > (size_t)base) {
186 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
187 size = (size_t)base;
188 }
189 return size;
190 }
191
192 static inline stack_t get_stack_info() {
193 stack_t st;
194 int retval = thr_stksegment(&st);
195 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
196 assert(retval == 0, "incorrect return value from thr_stksegment");
197 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
198 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
199 return st;
200 }
201
202 static void _handle_uncaught_cxx_exception() {
203 VMError::report_and_die("An uncaught C++ exception");
204 }
205
206 bool os::is_primordial_thread(void) {
207 int r = thr_main();
208 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
209 return r == 1;
210 }
211
212 address os::current_stack_base() {
213 bool _is_primordial_thread = is_primordial_thread();
214
215 // Workaround 4352906, avoid calls to thr_stksegment by
216 // thr_main after the first one (it looks like we trash
217 // some data, causing the value for ss_sp to be incorrect).
218 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
219 stack_t st = get_stack_info();
220 if (_is_primordial_thread) {
221 // cache initial value of stack base
222 os::Solaris::_main_stack_base = (address)st.ss_sp;
223 }
224 return (address)st.ss_sp;
225 } else {
226 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
227 return os::Solaris::_main_stack_base;
228 }
229 }
230
231 size_t os::current_stack_size() {
232 size_t size;
233
234 if (!is_primordial_thread()) {
235 size = get_stack_info().ss_size;
236 } else {
237 struct rlimit limits;
238 getrlimit(RLIMIT_STACK, &limits);
239 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
240 }
241 // base may not be page aligned
242 address base = current_stack_base();
243 address bottom = align_up(base - size, os::vm_page_size());;
244 return (size_t)(base - bottom);
245 }
246
247 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
248 return localtime_r(clock, res);
249 }
250
251 void os::Solaris::try_enable_extended_io() {
252 typedef int (*enable_extended_FILE_stdio_t)(int, int);
253
254 if (!UseExtendedFileIO) {
255 return;
256 }
257
258 enable_extended_FILE_stdio_t enabler =
259 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
260 "enable_extended_FILE_stdio");
261 if (enabler) {
262 enabler(-1, -1);
263 }
264 }
265
266 static int _processors_online = 0;
267
268 jint os::Solaris::_os_thread_limit = 0;
269 volatile jint os::Solaris::_os_thread_count = 0;
270
271 julong os::available_memory() {
272 return Solaris::available_memory();
273 }
274
275 julong os::Solaris::available_memory() {
276 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
277 }
278
279 julong os::Solaris::_physical_memory = 0;
280
281 julong os::physical_memory() {
282 return Solaris::physical_memory();
283 }
284
285 static hrtime_t first_hrtime = 0;
286 static const hrtime_t hrtime_hz = 1000*1000*1000;
287 static volatile hrtime_t max_hrtime = 0;
288
289
290 void os::Solaris::initialize_system_info() {
291 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
292 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
293 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
294 (julong)sysconf(_SC_PAGESIZE);
295 }
296
297 uint os::processor_id() {
298 const processorid_t id = ::getcpuid();
299 assert(id >= 0 && id < _processor_count, "Invalid processor id");
300 return (uint)id;
301 }
302
303 int os::active_processor_count() {
304 // User has overridden the number of active processors
305 if (ActiveProcessorCount > 0) {
306 log_trace(os)("active_processor_count: "
307 "active processor count set by user : %d",
308 ActiveProcessorCount);
309 return ActiveProcessorCount;
310 }
311
312 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
313 pid_t pid = getpid();
314 psetid_t pset = PS_NONE;
315 // Are we running in a processor set or is there any processor set around?
316 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
317 uint_t pset_cpus;
318 // Query the number of cpus available to us.
319 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
320 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
321 _processors_online = pset_cpus;
322 return pset_cpus;
323 }
324 }
325 // Otherwise return number of online cpus
326 return online_cpus;
327 }
328
329 static bool find_processors_in_pset(psetid_t pset,
330 processorid_t** id_array,
331 uint_t* id_length) {
332 bool result = false;
333 // Find the number of processors in the processor set.
334 if (pset_info(pset, NULL, id_length, NULL) == 0) {
335 // Make up an array to hold their ids.
336 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
337 // Fill in the array with their processor ids.
338 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
339 result = true;
340 }
341 }
342 return result;
343 }
344
345 // Callers of find_processors_online() must tolerate imprecise results --
346 // the system configuration can change asynchronously because of DR
347 // or explicit psradm operations.
348 //
349 // We also need to take care that the loop (below) terminates as the
350 // number of processors online can change between the _SC_NPROCESSORS_ONLN
351 // request and the loop that builds the list of processor ids. Unfortunately
352 // there's no reliable way to determine the maximum valid processor id,
353 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
354 // man pages, which claim the processor id set is "sparse, but
355 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
356 // exit the loop.
357 //
358 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
359 // not available on S8.0.
360
361 static bool find_processors_online(processorid_t** id_array,
362 uint* id_length) {
363 const processorid_t MAX_PROCESSOR_ID = 100000;
364 // Find the number of processors online.
365 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
366 // Make up an array to hold their ids.
367 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
368 // Processors need not be numbered consecutively.
369 long found = 0;
370 processorid_t next = 0;
371 while (found < *id_length && next < MAX_PROCESSOR_ID) {
372 processor_info_t info;
373 if (processor_info(next, &info) == 0) {
374 // NB, PI_NOINTR processors are effectively online ...
375 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
376 (*id_array)[found] = next;
377 found += 1;
378 }
379 }
380 next += 1;
381 }
382 if (found < *id_length) {
383 // The loop above didn't identify the expected number of processors.
384 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
385 // and re-running the loop, above, but there's no guarantee of progress
386 // if the system configuration is in flux. Instead, we just return what
387 // we've got. Note that in the worst case find_processors_online() could
388 // return an empty set. (As a fall-back in the case of the empty set we
389 // could just return the ID of the current processor).
390 *id_length = found;
391 }
392
393 return true;
394 }
395
396 static bool assign_distribution(processorid_t* id_array,
397 uint id_length,
398 uint* distribution,
399 uint distribution_length) {
400 // We assume we can assign processorid_t's to uint's.
401 assert(sizeof(processorid_t) == sizeof(uint),
402 "can't convert processorid_t to uint");
403 // Quick check to see if we won't succeed.
404 if (id_length < distribution_length) {
405 return false;
406 }
407 // Assign processor ids to the distribution.
408 // Try to shuffle processors to distribute work across boards,
409 // assuming 4 processors per board.
410 const uint processors_per_board = ProcessDistributionStride;
411 // Find the maximum processor id.
412 processorid_t max_id = 0;
413 for (uint m = 0; m < id_length; m += 1) {
414 max_id = MAX2(max_id, id_array[m]);
415 }
416 // The next id, to limit loops.
417 const processorid_t limit_id = max_id + 1;
418 // Make up markers for available processors.
419 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
420 for (uint c = 0; c < limit_id; c += 1) {
421 available_id[c] = false;
422 }
423 for (uint a = 0; a < id_length; a += 1) {
424 available_id[id_array[a]] = true;
425 }
426 // Step by "boards", then by "slot", copying to "assigned".
427 // NEEDS_CLEANUP: The assignment of processors should be stateful,
428 // remembering which processors have been assigned by
429 // previous calls, etc., so as to distribute several
430 // independent calls of this method. What we'd like is
431 // It would be nice to have an API that let us ask
432 // how many processes are bound to a processor,
433 // but we don't have that, either.
434 // In the short term, "board" is static so that
435 // subsequent distributions don't all start at board 0.
436 static uint board = 0;
437 uint assigned = 0;
438 // Until we've found enough processors ....
439 while (assigned < distribution_length) {
440 // ... find the next available processor in the board.
441 for (uint slot = 0; slot < processors_per_board; slot += 1) {
442 uint try_id = board * processors_per_board + slot;
443 if ((try_id < limit_id) && (available_id[try_id] == true)) {
444 distribution[assigned] = try_id;
445 available_id[try_id] = false;
446 assigned += 1;
447 break;
448 }
449 }
450 board += 1;
451 if (board * processors_per_board + 0 >= limit_id) {
452 board = 0;
453 }
454 }
455 if (available_id != NULL) {
456 FREE_C_HEAP_ARRAY(bool, available_id);
457 }
458 return true;
459 }
460
461 void os::set_native_thread_name(const char *name) {
462 if (Solaris::_pthread_setname_np != NULL) {
463 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
464 // but we explicitly copy into a size-limited buffer to avoid any
465 // possible overflow.
466 char buf[32];
467 snprintf(buf, sizeof(buf), "%s", name);
468 buf[sizeof(buf) - 1] = '\0';
469 Solaris::_pthread_setname_np(pthread_self(), buf);
470 }
471 }
472
473 bool os::distribute_processes(uint length, uint* distribution) {
474 bool result = false;
475 // Find the processor id's of all the available CPUs.
476 processorid_t* id_array = NULL;
477 uint id_length = 0;
478 // There are some races between querying information and using it,
479 // since processor sets can change dynamically.
480 psetid_t pset = PS_NONE;
481 // Are we running in a processor set?
482 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
483 result = find_processors_in_pset(pset, &id_array, &id_length);
484 } else {
485 result = find_processors_online(&id_array, &id_length);
486 }
487 if (result == true) {
488 if (id_length >= length) {
489 result = assign_distribution(id_array, id_length, distribution, length);
490 } else {
491 result = false;
492 }
493 }
494 if (id_array != NULL) {
495 FREE_C_HEAP_ARRAY(processorid_t, id_array);
496 }
497 return result;
498 }
499
500 bool os::bind_to_processor(uint processor_id) {
501 // We assume that a processorid_t can be stored in a uint.
502 assert(sizeof(uint) == sizeof(processorid_t),
503 "can't convert uint to processorid_t");
504 int bind_result =
505 processor_bind(P_LWPID, // bind LWP.
506 P_MYID, // bind current LWP.
507 (processorid_t) processor_id, // id.
508 NULL); // don't return old binding.
509 return (bind_result == 0);
510 }
511
512 // Return true if user is running as root.
513
514 bool os::have_special_privileges() {
515 static bool init = false;
516 static bool privileges = false;
517 if (!init) {
518 privileges = (getuid() != geteuid()) || (getgid() != getegid());
519 init = true;
520 }
521 return privileges;
522 }
523
524
525 void os::init_system_properties_values() {
526 // The next steps are taken in the product version:
527 //
528 // Obtain the JAVA_HOME value from the location of libjvm.so.
529 // This library should be located at:
530 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
531 //
532 // If "/jre/lib/" appears at the right place in the path, then we
533 // assume libjvm.so is installed in a JDK and we use this path.
534 //
535 // Otherwise exit with message: "Could not create the Java virtual machine."
536 //
537 // The following extra steps are taken in the debugging version:
538 //
539 // If "/jre/lib/" does NOT appear at the right place in the path
540 // instead of exit check for $JAVA_HOME environment variable.
541 //
542 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
543 // then we append a fake suffix "hotspot/libjvm.so" to this path so
544 // it looks like libjvm.so is installed there
545 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
546 //
547 // Otherwise exit.
548 //
549 // Important note: if the location of libjvm.so changes this
550 // code needs to be changed accordingly.
551
552 // Base path of extensions installed on the system.
553 #define SYS_EXT_DIR "/usr/jdk/packages"
554 #define EXTENSIONS_DIR "/lib/ext"
555
556 // Buffer that fits several sprintfs.
557 // Note that the space for the colon and the trailing null are provided
558 // by the nulls included by the sizeof operator.
559 const size_t bufsize =
560 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
561 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
562 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
563 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
564
565 // sysclasspath, java_home, dll_dir
566 {
567 char *pslash;
568 os::jvm_path(buf, bufsize);
569
570 // Found the full path to libjvm.so.
571 // Now cut the path to <java_home>/jre if we can.
572 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
573 pslash = strrchr(buf, '/');
574 if (pslash != NULL) {
575 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
576 }
577 Arguments::set_dll_dir(buf);
578
579 if (pslash != NULL) {
580 pslash = strrchr(buf, '/');
581 if (pslash != NULL) {
582 *pslash = '\0'; // Get rid of /lib.
583 }
584 }
585 Arguments::set_java_home(buf);
586 if (!set_boot_path('/', ':')) {
587 vm_exit_during_initialization("Failed setting boot class path.", NULL);
588 }
589 }
590
591 // Where to look for native libraries.
592 {
593 // Use dlinfo() to determine the correct java.library.path.
594 //
595 // If we're launched by the Java launcher, and the user
596 // does not set java.library.path explicitly on the commandline,
597 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
598 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
599 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
600 // /usr/lib), which is exactly what we want.
601 //
602 // If the user does set java.library.path, it completely
603 // overwrites this setting, and always has.
604 //
605 // If we're not launched by the Java launcher, we may
606 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
607 // settings. Again, dlinfo does exactly what we want.
608
609 Dl_serinfo info_sz, *info = &info_sz;
610 Dl_serpath *path;
611 char *library_path;
612 char *common_path = buf;
613
614 // Determine search path count and required buffer size.
615 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
616 FREE_C_HEAP_ARRAY(char, buf);
617 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
618 }
619
620 // Allocate new buffer and initialize.
621 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
622 info->dls_size = info_sz.dls_size;
623 info->dls_cnt = info_sz.dls_cnt;
624
625 // Obtain search path information.
626 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
627 FREE_C_HEAP_ARRAY(char, buf);
628 FREE_C_HEAP_ARRAY(char, info);
629 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
630 }
631
632 path = &info->dls_serpath[0];
633
634 // Note: Due to a legacy implementation, most of the library path
635 // is set in the launcher. This was to accomodate linking restrictions
636 // on legacy Solaris implementations (which are no longer supported).
637 // Eventually, all the library path setting will be done here.
638 //
639 // However, to prevent the proliferation of improperly built native
640 // libraries, the new path component /usr/jdk/packages is added here.
641
642 // Construct the invariant part of ld_library_path.
643 sprintf(common_path, SYS_EXT_DIR "/lib");
644
645 // Struct size is more than sufficient for the path components obtained
646 // through the dlinfo() call, so only add additional space for the path
647 // components explicitly added here.
648 size_t library_path_size = info->dls_size + strlen(common_path);
649 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
650 library_path[0] = '\0';
651
652 // Construct the desired Java library path from the linker's library
653 // search path.
654 //
655 // For compatibility, it is optimal that we insert the additional path
656 // components specific to the Java VM after those components specified
657 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
658 // infrastructure.
659 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
660 strcpy(library_path, common_path);
661 } else {
662 int inserted = 0;
663 int i;
664 for (i = 0; i < info->dls_cnt; i++, path++) {
665 uint_t flags = path->dls_flags & LA_SER_MASK;
666 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
667 strcat(library_path, common_path);
668 strcat(library_path, os::path_separator());
669 inserted = 1;
670 }
671 strcat(library_path, path->dls_name);
672 strcat(library_path, os::path_separator());
673 }
674 // Eliminate trailing path separator.
675 library_path[strlen(library_path)-1] = '\0';
676 }
677
678 // happens before argument parsing - can't use a trace flag
679 // tty->print_raw("init_system_properties_values: native lib path: ");
680 // tty->print_raw_cr(library_path);
681
682 // Callee copies into its own buffer.
683 Arguments::set_library_path(library_path);
684
685 FREE_C_HEAP_ARRAY(char, library_path);
686 FREE_C_HEAP_ARRAY(char, info);
687 }
688
689 // Extensions directories.
690 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
691 Arguments::set_ext_dirs(buf);
692
693 FREE_C_HEAP_ARRAY(char, buf);
694
695 #undef SYS_EXT_DIR
696 #undef EXTENSIONS_DIR
697 }
698
699 void os::breakpoint() {
700 BREAKPOINT;
701 }
702
703 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
704 address stackStart = (address)thread->stack_base();
705 address stackEnd = (address)(stackStart - (address)thread->stack_size());
706 if (sp < stackStart && sp >= stackEnd) return true;
707 return false;
708 }
709
710 extern "C" void breakpoint() {
711 // use debugger to set breakpoint here
712 }
713
714 static thread_t main_thread;
715
716 // Thread start routine for all newly created threads
717 extern "C" void* thread_native_entry(void* thread_addr) {
718
719 Thread* thread = (Thread*)thread_addr;
720
721 thread->record_stack_base_and_size();
722
723 // Try to randomize the cache line index of hot stack frames.
724 // This helps when threads of the same stack traces evict each other's
725 // cache lines. The threads can be either from the same JVM instance, or
726 // from different JVM instances. The benefit is especially true for
727 // processors with hyperthreading technology.
728 static int counter = 0;
729 int pid = os::current_process_id();
730 alloca(((pid ^ counter++) & 7) * 128);
731
732 int prio;
733
734 thread->initialize_thread_current();
735
736 OSThread* osthr = thread->osthread();
737
738 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
739
740 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
741 os::current_thread_id());
742
743 if (UseNUMA) {
744 int lgrp_id = os::numa_get_group_id();
745 if (lgrp_id != -1) {
746 thread->set_lgrp_id(lgrp_id);
747 }
748 }
749
750 // Our priority was set when we were created, and stored in the
751 // osthread, but couldn't be passed through to our LWP until now.
752 // So read back the priority and set it again.
753
754 if (osthr->thread_id() != -1) {
755 if (UseThreadPriorities) {
756 int prio = osthr->native_priority();
757 if (ThreadPriorityVerbose) {
758 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
759 INTPTR_FORMAT ", setting priority: %d\n",
760 osthr->thread_id(), osthr->lwp_id(), prio);
761 }
762 os::set_native_priority(thread, prio);
763 }
764 } else if (ThreadPriorityVerbose) {
765 warning("Can't set priority in _start routine, thread id hasn't been set\n");
766 }
767
768 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
769
770 // initialize signal mask for this thread
771 os::Solaris::hotspot_sigmask(thread);
772
773 os::Solaris::init_thread_fpu_state();
774 std::set_terminate(_handle_uncaught_cxx_exception);
775
776 thread->call_run();
777
778 // Note: at this point the thread object may already have deleted itself.
779 // Do not dereference it from here on out.
780
781 // One less thread is executing
782 // When the VMThread gets here, the main thread may have already exited
783 // which frees the CodeHeap containing the Atomic::dec code
784 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
785 Atomic::dec(&os::Solaris::_os_thread_count);
786 }
787
788 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
789
790 if (UseDetachedThreads) {
791 thr_exit(NULL);
792 ShouldNotReachHere();
793 }
794 return NULL;
795 }
796
797 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
798 // Allocate the OSThread object
799 OSThread* osthread = new OSThread(NULL, NULL);
800 if (osthread == NULL) return NULL;
801
802 // Store info on the Solaris thread into the OSThread
803 osthread->set_thread_id(thread_id);
804 osthread->set_lwp_id(_lwp_self());
805
806 if (UseNUMA) {
807 int lgrp_id = os::numa_get_group_id();
808 if (lgrp_id != -1) {
809 thread->set_lgrp_id(lgrp_id);
810 }
811 }
812
813 if (ThreadPriorityVerbose) {
814 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
815 osthread->thread_id(), osthread->lwp_id());
816 }
817
818 // Initial thread state is INITIALIZED, not SUSPENDED
819 osthread->set_state(INITIALIZED);
820
821 return osthread;
822 }
823
824 void os::Solaris::hotspot_sigmask(Thread* thread) {
825 //Save caller's signal mask
826 sigset_t sigmask;
827 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
828 OSThread *osthread = thread->osthread();
829 osthread->set_caller_sigmask(sigmask);
830
831 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
832 if (!ReduceSignalUsage) {
833 if (thread->is_VM_thread()) {
834 // Only the VM thread handles BREAK_SIGNAL ...
835 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
836 } else {
837 // ... all other threads block BREAK_SIGNAL
838 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
839 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
840 }
841 }
842 }
843
844 bool os::create_attached_thread(JavaThread* thread) {
845 #ifdef ASSERT
846 thread->verify_not_published();
847 #endif
848 OSThread* osthread = create_os_thread(thread, thr_self());
849 if (osthread == NULL) {
850 return false;
851 }
852
853 // Initial thread state is RUNNABLE
854 osthread->set_state(RUNNABLE);
855 thread->set_osthread(osthread);
856
857 // initialize signal mask for this thread
858 // and save the caller's signal mask
859 os::Solaris::hotspot_sigmask(thread);
860
861 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
862 os::current_thread_id());
863
864 return true;
865 }
866
867 bool os::create_main_thread(JavaThread* thread) {
868 #ifdef ASSERT
869 thread->verify_not_published();
870 #endif
871 if (_starting_thread == NULL) {
872 _starting_thread = create_os_thread(thread, main_thread);
873 if (_starting_thread == NULL) {
874 return false;
875 }
876 }
877
878 // The primodial thread is runnable from the start
879 _starting_thread->set_state(RUNNABLE);
880
881 thread->set_osthread(_starting_thread);
882
883 // initialize signal mask for this thread
884 // and save the caller's signal mask
885 os::Solaris::hotspot_sigmask(thread);
886
887 return true;
888 }
889
890 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
891 static char* describe_thr_create_attributes(char* buf, size_t buflen,
892 size_t stacksize, long flags) {
893 stringStream ss(buf, buflen);
894 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
895 ss.print("flags: ");
896 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
897 #define ALL(X) \
898 X(THR_SUSPENDED) \
899 X(THR_DETACHED) \
900 X(THR_BOUND) \
901 X(THR_NEW_LWP) \
902 X(THR_DAEMON)
903 ALL(PRINT_FLAG)
904 #undef ALL
905 #undef PRINT_FLAG
906 return buf;
907 }
908
909 // return default stack size for thr_type
910 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
911 // default stack size when not specified by caller is 1M (2M for LP64)
912 size_t s = (BytesPerWord >> 2) * K * K;
913 return s;
914 }
915
916 bool os::create_thread(Thread* thread, ThreadType thr_type,
917 size_t req_stack_size) {
918 // Allocate the OSThread object
919 OSThread* osthread = new OSThread(NULL, NULL);
920 if (osthread == NULL) {
921 return false;
922 }
923
924 if (ThreadPriorityVerbose) {
925 char *thrtyp;
926 switch (thr_type) {
927 case vm_thread:
928 thrtyp = (char *)"vm";
929 break;
930 case cgc_thread:
931 thrtyp = (char *)"cgc";
932 break;
933 case pgc_thread:
934 thrtyp = (char *)"pgc";
935 break;
936 case java_thread:
937 thrtyp = (char *)"java";
938 break;
939 case compiler_thread:
940 thrtyp = (char *)"compiler";
941 break;
942 case watcher_thread:
943 thrtyp = (char *)"watcher";
944 break;
945 default:
946 thrtyp = (char *)"unknown";
947 break;
948 }
949 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
950 }
951
952 // calculate stack size if it's not specified by caller
953 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
954
955 // Initial state is ALLOCATED but not INITIALIZED
956 osthread->set_state(ALLOCATED);
957
958 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
959 // We got lots of threads. Check if we still have some address space left.
960 // Need to be at least 5Mb of unreserved address space. We do check by
961 // trying to reserve some.
962 const size_t VirtualMemoryBangSize = 20*K*K;
963 char* mem = os::reserve_memory(VirtualMemoryBangSize);
964 if (mem == NULL) {
965 delete osthread;
966 return false;
967 } else {
968 // Release the memory again
969 os::release_memory(mem, VirtualMemoryBangSize);
970 }
971 }
972
973 // Setup osthread because the child thread may need it.
974 thread->set_osthread(osthread);
975
976 // Create the Solaris thread
977 thread_t tid = 0;
978 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
979 int status;
980
981 // Mark that we don't have an lwp or thread id yet.
982 // In case we attempt to set the priority before the thread starts.
983 osthread->set_lwp_id(-1);
984 osthread->set_thread_id(-1);
985
986 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
987
988 char buf[64];
989 if (status == 0) {
990 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
991 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
992 } else {
993 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
994 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
995 }
996
997 if (status != 0) {
998 thread->set_osthread(NULL);
999 // Need to clean up stuff we've allocated so far
1000 delete osthread;
1001 return false;
1002 }
1003
1004 Atomic::inc(&os::Solaris::_os_thread_count);
1005
1006 // Store info on the Solaris thread into the OSThread
1007 osthread->set_thread_id(tid);
1008
1009 // Remember that we created this thread so we can set priority on it
1010 osthread->set_vm_created();
1011
1012 // Most thread types will set an explicit priority before starting the thread,
1013 // but for those that don't we need a valid value to read back in thread_native_entry.
1014 osthread->set_native_priority(NormPriority);
1015
1016 // Initial thread state is INITIALIZED, not SUSPENDED
1017 osthread->set_state(INITIALIZED);
1018
1019 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1020 return true;
1021 }
1022
1023 debug_only(static bool signal_sets_initialized = false);
1024 static sigset_t unblocked_sigs, vm_sigs;
1025
1026 void os::Solaris::signal_sets_init() {
1027 // Should also have an assertion stating we are still single-threaded.
1028 assert(!signal_sets_initialized, "Already initialized");
1029 // Fill in signals that are necessarily unblocked for all threads in
1030 // the VM. Currently, we unblock the following signals:
1031 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1032 // by -Xrs (=ReduceSignalUsage));
1033 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1034 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1035 // the dispositions or masks wrt these signals.
1036 // Programs embedding the VM that want to use the above signals for their
1037 // own purposes must, at this time, use the "-Xrs" option to prevent
1038 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1039 // (See bug 4345157, and other related bugs).
1040 // In reality, though, unblocking these signals is really a nop, since
1041 // these signals are not blocked by default.
1042 sigemptyset(&unblocked_sigs);
1043 sigaddset(&unblocked_sigs, SIGILL);
1044 sigaddset(&unblocked_sigs, SIGSEGV);
1045 sigaddset(&unblocked_sigs, SIGBUS);
1046 sigaddset(&unblocked_sigs, SIGFPE);
1047 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1048
1049 if (!ReduceSignalUsage) {
1050 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1051 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1052 }
1053 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1054 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1055 }
1056 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1057 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1058 }
1059 }
1060 // Fill in signals that are blocked by all but the VM thread.
1061 sigemptyset(&vm_sigs);
1062 if (!ReduceSignalUsage) {
1063 sigaddset(&vm_sigs, BREAK_SIGNAL);
1064 }
1065 debug_only(signal_sets_initialized = true);
1066
1067 // For diagnostics only used in run_periodic_checks
1068 sigemptyset(&check_signal_done);
1069 }
1070
1071 // These are signals that are unblocked while a thread is running Java.
1072 // (For some reason, they get blocked by default.)
1073 sigset_t* os::Solaris::unblocked_signals() {
1074 assert(signal_sets_initialized, "Not initialized");
1075 return &unblocked_sigs;
1076 }
1077
1078 // These are the signals that are blocked while a (non-VM) thread is
1079 // running Java. Only the VM thread handles these signals.
1080 sigset_t* os::Solaris::vm_signals() {
1081 assert(signal_sets_initialized, "Not initialized");
1082 return &vm_sigs;
1083 }
1084
1085 // CR 7190089: on Solaris, primordial thread's stack needs adjusting.
1086 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited).
1087 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) {
1088 assert(is_primordial_thread(), "Call only for primordial thread");
1089
1090 JavaThread* jt = (JavaThread *)thr;
1091 assert(jt != NULL, "Sanity check");
1092 size_t stack_size;
1093 address base = jt->stack_base();
1094 if (Arguments::created_by_java_launcher()) {
1095 // Use 2MB to allow for Solaris 7 64 bit mode.
1096 stack_size = JavaThread::stack_size_at_create() == 0
1097 ? 2048*K : JavaThread::stack_size_at_create();
1098
1099 // There are rare cases when we may have already used more than
1100 // the basic stack size allotment before this method is invoked.
1101 // Attempt to allow for a normally sized java_stack.
1102 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1103 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1104 } else {
1105 // 6269555: If we were not created by a Java launcher, i.e. if we are
1106 // running embedded in a native application, treat the primordial thread
1107 // as much like a native attached thread as possible. This means using
1108 // the current stack size from thr_stksegment(), unless it is too large
1109 // to reliably setup guard pages. A reasonable max size is 8MB.
1110 size_t current_size = os::current_stack_size();
1111 // This should never happen, but just in case....
1112 if (current_size == 0) current_size = 2 * K * K;
1113 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1114 }
1115 address bottom = align_up(base - stack_size, os::vm_page_size());;
1116 stack_size = (size_t)(base - bottom);
1117
1118 assert(stack_size > 0, "Stack size calculation problem");
1119
1120 if (stack_size > jt->stack_size()) {
1121 #ifndef PRODUCT
1122 struct rlimit limits;
1123 getrlimit(RLIMIT_STACK, &limits);
1124 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1125 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1126 #endif
1127 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1128 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1129 "See limit(1) to increase the stack size limit.",
1130 stack_size / K, jt->stack_size() / K);
1131 vm_exit(1);
1132 }
1133 assert(jt->stack_size() >= stack_size,
1134 "Attempt to map more stack than was allocated");
1135 jt->set_stack_size(stack_size);
1136
1137 }
1138
1139
1140
1141 // Free Solaris resources related to the OSThread
1142 void os::free_thread(OSThread* osthread) {
1143 assert(osthread != NULL, "os::free_thread but osthread not set");
1144
1145 // We are told to free resources of the argument thread,
1146 // but we can only really operate on the current thread.
1147 assert(Thread::current()->osthread() == osthread,
1148 "os::free_thread but not current thread");
1149
1150 // Restore caller's signal mask
1151 sigset_t sigmask = osthread->caller_sigmask();
1152 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1153
1154 delete osthread;
1155 }
1156
1157 void os::pd_start_thread(Thread* thread) {
1158 int status = thr_continue(thread->osthread()->thread_id());
1159 assert_status(status == 0, status, "thr_continue failed");
1160 }
1161
1162
1163 intx os::current_thread_id() {
1164 return (intx)thr_self();
1165 }
1166
1167 static pid_t _initial_pid = 0;
1168
1169 int os::current_process_id() {
1170 return (int)(_initial_pid ? _initial_pid : getpid());
1171 }
1172
1173 // gethrtime() should be monotonic according to the documentation,
1174 // but some virtualized platforms are known to break this guarantee.
1175 // getTimeNanos() must be guaranteed not to move backwards, so we
1176 // are forced to add a check here.
1177 inline hrtime_t getTimeNanos() {
1178 const hrtime_t now = gethrtime();
1179 const hrtime_t prev = max_hrtime;
1180 if (now <= prev) {
1181 return prev; // same or retrograde time;
1182 }
1183 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev);
1184 assert(obsv >= prev, "invariant"); // Monotonicity
1185 // If the CAS succeeded then we're done and return "now".
1186 // If the CAS failed and the observed value "obsv" is >= now then
1187 // we should return "obsv". If the CAS failed and now > obsv > prv then
1188 // some other thread raced this thread and installed a new value, in which case
1189 // we could either (a) retry the entire operation, (b) retry trying to install now
1190 // or (c) just return obsv. We use (c). No loop is required although in some cases
1191 // we might discard a higher "now" value in deference to a slightly lower but freshly
1192 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1193 // to (a) or (b) -- and greatly reduces coherence traffic.
1194 // We might also condition (c) on the magnitude of the delta between obsv and now.
1195 // Avoiding excessive CAS operations to hot RW locations is critical.
1196 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1197 return (prev == obsv) ? now : obsv;
1198 }
1199
1200 // Time since start-up in seconds to a fine granularity.
1201 // Used by VMSelfDestructTimer and the MemProfiler.
1202 double os::elapsedTime() {
1203 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1204 }
1205
1206 jlong os::elapsed_counter() {
1207 return (jlong)(getTimeNanos() - first_hrtime);
1208 }
1209
1210 jlong os::elapsed_frequency() {
1211 return hrtime_hz;
1212 }
1213
1214 // Return the real, user, and system times in seconds from an
1215 // arbitrary fixed point in the past.
1216 bool os::getTimesSecs(double* process_real_time,
1217 double* process_user_time,
1218 double* process_system_time) {
1219 struct tms ticks;
1220 clock_t real_ticks = times(&ticks);
1221
1222 if (real_ticks == (clock_t) (-1)) {
1223 return false;
1224 } else {
1225 double ticks_per_second = (double) clock_tics_per_sec;
1226 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1227 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1228 // For consistency return the real time from getTimeNanos()
1229 // converted to seconds.
1230 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1231
1232 return true;
1233 }
1234 }
1235
1236 bool os::supports_vtime() { return true; }
1237 bool os::enable_vtime() { return false; }
1238 bool os::vtime_enabled() { return false; }
1239
1240 double os::elapsedVTime() {
1241 return (double)gethrvtime() / (double)hrtime_hz;
1242 }
1243
1244 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1245 jlong os::javaTimeMillis() {
1246 timeval t;
1247 if (gettimeofday(&t, NULL) == -1) {
1248 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1249 }
1250 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1251 }
1252
1253 // Must return seconds+nanos since Jan 1 1970. This must use the same
1254 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1255 // we need better than 1ms accuracy
1256 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1257 timeval t;
1258 if (gettimeofday(&t, NULL) == -1) {
1259 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1260 }
1261 seconds = jlong(t.tv_sec);
1262 nanos = jlong(t.tv_usec) * 1000;
1263 }
1264
1265
1266 jlong os::javaTimeNanos() {
1267 return (jlong)getTimeNanos();
1268 }
1269
1270 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1271 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1272 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1273 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1274 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1275 }
1276
1277 char * os::local_time_string(char *buf, size_t buflen) {
1278 struct tm t;
1279 time_t long_time;
1280 time(&long_time);
1281 localtime_r(&long_time, &t);
1282 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1283 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1284 t.tm_hour, t.tm_min, t.tm_sec);
1285 return buf;
1286 }
1287
1288 // Note: os::shutdown() might be called very early during initialization, or
1289 // called from signal handler. Before adding something to os::shutdown(), make
1290 // sure it is async-safe and can handle partially initialized VM.
1291 void os::shutdown() {
1292
1293 // allow PerfMemory to attempt cleanup of any persistent resources
1294 perfMemory_exit();
1295
1296 // needs to remove object in file system
1297 AttachListener::abort();
1298
1299 // flush buffered output, finish log files
1300 ostream_abort();
1301
1302 // Check for abort hook
1303 abort_hook_t abort_hook = Arguments::abort_hook();
1304 if (abort_hook != NULL) {
1305 abort_hook();
1306 }
1307 }
1308
1309 // Note: os::abort() might be called very early during initialization, or
1310 // called from signal handler. Before adding something to os::abort(), make
1311 // sure it is async-safe and can handle partially initialized VM.
1312 void os::abort(bool dump_core, void* siginfo, const void* context) {
1313 os::shutdown();
1314 if (dump_core) {
1315 #ifndef PRODUCT
1316 fdStream out(defaultStream::output_fd());
1317 out.print_raw("Current thread is ");
1318 char buf[16];
1319 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1320 out.print_raw_cr(buf);
1321 out.print_raw_cr("Dumping core ...");
1322 #endif
1323 ::abort(); // dump core (for debugging)
1324 }
1325
1326 ::exit(1);
1327 }
1328
1329 // Die immediately, no exit hook, no abort hook, no cleanup.
1330 void os::die() {
1331 ::abort(); // dump core (for debugging)
1332 }
1333
1334 // DLL functions
1335
1336 const char* os::dll_file_extension() { return ".so"; }
1337
1338 // This must be hard coded because it's the system's temporary
1339 // directory not the java application's temp directory, ala java.io.tmpdir.
1340 const char* os::get_temp_directory() { return "/tmp"; }
1341
1342 // check if addr is inside libjvm.so
1343 bool os::address_is_in_vm(address addr) {
1344 static address libjvm_base_addr;
1345 Dl_info dlinfo;
1346
1347 if (libjvm_base_addr == NULL) {
1348 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1349 libjvm_base_addr = (address)dlinfo.dli_fbase;
1350 }
1351 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1352 }
1353
1354 if (dladdr((void *)addr, &dlinfo) != 0) {
1355 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1356 }
1357
1358 return false;
1359 }
1360
1361 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1362 static dladdr1_func_type dladdr1_func = NULL;
1363
1364 bool os::dll_address_to_function_name(address addr, char *buf,
1365 int buflen, int * offset,
1366 bool demangle) {
1367 // buf is not optional, but offset is optional
1368 assert(buf != NULL, "sanity check");
1369
1370 Dl_info dlinfo;
1371
1372 // dladdr1_func was initialized in os::init()
1373 if (dladdr1_func != NULL) {
1374 // yes, we have dladdr1
1375
1376 // Support for dladdr1 is checked at runtime; it may be
1377 // available even if the vm is built on a machine that does
1378 // not have dladdr1 support. Make sure there is a value for
1379 // RTLD_DL_SYMENT.
1380 #ifndef RTLD_DL_SYMENT
1381 #define RTLD_DL_SYMENT 1
1382 #endif
1383 #ifdef _LP64
1384 Elf64_Sym * info;
1385 #else
1386 Elf32_Sym * info;
1387 #endif
1388 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1389 RTLD_DL_SYMENT) != 0) {
1390 // see if we have a matching symbol that covers our address
1391 if (dlinfo.dli_saddr != NULL &&
1392 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1393 if (dlinfo.dli_sname != NULL) {
1394 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1395 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1396 }
1397 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1398 return true;
1399 }
1400 }
1401 // no matching symbol so try for just file info
1402 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1403 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1404 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1405 return true;
1406 }
1407 }
1408 }
1409 buf[0] = '\0';
1410 if (offset != NULL) *offset = -1;
1411 return false;
1412 }
1413
1414 // no, only dladdr is available
1415 if (dladdr((void *)addr, &dlinfo) != 0) {
1416 // see if we have a matching symbol
1417 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1418 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1419 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1420 }
1421 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1422 return true;
1423 }
1424 // no matching symbol so try for just file info
1425 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1426 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1427 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1428 return true;
1429 }
1430 }
1431 }
1432 buf[0] = '\0';
1433 if (offset != NULL) *offset = -1;
1434 return false;
1435 }
1436
1437 bool os::dll_address_to_library_name(address addr, char* buf,
1438 int buflen, int* offset) {
1439 // buf is not optional, but offset is optional
1440 assert(buf != NULL, "sanity check");
1441
1442 Dl_info dlinfo;
1443
1444 if (dladdr((void*)addr, &dlinfo) != 0) {
1445 if (dlinfo.dli_fname != NULL) {
1446 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1447 }
1448 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1449 *offset = addr - (address)dlinfo.dli_fbase;
1450 }
1451 return true;
1452 }
1453
1454 buf[0] = '\0';
1455 if (offset) *offset = -1;
1456 return false;
1457 }
1458
1459 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1460 Dl_info dli;
1461 // Sanity check?
1462 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1463 dli.dli_fname == NULL) {
1464 return 1;
1465 }
1466
1467 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1468 if (handle == NULL) {
1469 return 1;
1470 }
1471
1472 Link_map *map;
1473 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1474 if (map == NULL) {
1475 dlclose(handle);
1476 return 1;
1477 }
1478
1479 while (map->l_prev != NULL) {
1480 map = map->l_prev;
1481 }
1482
1483 while (map != NULL) {
1484 // Iterate through all map entries and call callback with fields of interest
1485 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1486 dlclose(handle);
1487 return 1;
1488 }
1489 map = map->l_next;
1490 }
1491
1492 dlclose(handle);
1493 return 0;
1494 }
1495
1496 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1497 outputStream * out = (outputStream *) param;
1498 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1499 return 0;
1500 }
1501
1502 void os::print_dll_info(outputStream * st) {
1503 st->print_cr("Dynamic libraries:"); st->flush();
1504 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1505 st->print_cr("Error: Cannot print dynamic libraries.");
1506 }
1507 }
1508
1509 // Loads .dll/.so and
1510 // in case of error it checks if .dll/.so was built for the
1511 // same architecture as Hotspot is running on
1512
1513 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1514 void * result= ::dlopen(filename, RTLD_LAZY);
1515 if (result != NULL) {
1516 // Successful loading
1517 return result;
1518 }
1519
1520 Elf32_Ehdr elf_head;
1521
1522 // Read system error message into ebuf
1523 // It may or may not be overwritten below
1524 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1525 ebuf[ebuflen-1]='\0';
1526 int diag_msg_max_length=ebuflen-strlen(ebuf);
1527 char* diag_msg_buf=ebuf+strlen(ebuf);
1528
1529 if (diag_msg_max_length==0) {
1530 // No more space in ebuf for additional diagnostics message
1531 return NULL;
1532 }
1533
1534
1535 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1536
1537 if (file_descriptor < 0) {
1538 // Can't open library, report dlerror() message
1539 return NULL;
1540 }
1541
1542 bool failed_to_read_elf_head=
1543 (sizeof(elf_head)!=
1544 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1545
1546 ::close(file_descriptor);
1547 if (failed_to_read_elf_head) {
1548 // file i/o error - report dlerror() msg
1549 return NULL;
1550 }
1551
1552 typedef struct {
1553 Elf32_Half code; // Actual value as defined in elf.h
1554 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1555 unsigned char elf_class; // 32 or 64 bit
1556 unsigned char endianess; // MSB or LSB
1557 char* name; // String representation
1558 } arch_t;
1559
1560 static const arch_t arch_array[]={
1561 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1562 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1563 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1564 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1565 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1566 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1567 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1568 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1569 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1570 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1571 };
1572
1573 #if (defined IA32)
1574 static Elf32_Half running_arch_code=EM_386;
1575 #elif (defined AMD64)
1576 static Elf32_Half running_arch_code=EM_X86_64;
1577 #elif (defined IA64)
1578 static Elf32_Half running_arch_code=EM_IA_64;
1579 #elif (defined __sparc) && (defined _LP64)
1580 static Elf32_Half running_arch_code=EM_SPARCV9;
1581 #elif (defined __sparc) && (!defined _LP64)
1582 static Elf32_Half running_arch_code=EM_SPARC;
1583 #elif (defined __powerpc64__)
1584 static Elf32_Half running_arch_code=EM_PPC64;
1585 #elif (defined __powerpc__)
1586 static Elf32_Half running_arch_code=EM_PPC;
1587 #elif (defined ARM)
1588 static Elf32_Half running_arch_code=EM_ARM;
1589 #else
1590 #error Method os::dll_load requires that one of following is defined:\
1591 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1592 #endif
1593
1594 // Identify compatability class for VM's architecture and library's architecture
1595 // Obtain string descriptions for architectures
1596
1597 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1598 int running_arch_index=-1;
1599
1600 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1601 if (running_arch_code == arch_array[i].code) {
1602 running_arch_index = i;
1603 }
1604 if (lib_arch.code == arch_array[i].code) {
1605 lib_arch.compat_class = arch_array[i].compat_class;
1606 lib_arch.name = arch_array[i].name;
1607 }
1608 }
1609
1610 assert(running_arch_index != -1,
1611 "Didn't find running architecture code (running_arch_code) in arch_array");
1612 if (running_arch_index == -1) {
1613 // Even though running architecture detection failed
1614 // we may still continue with reporting dlerror() message
1615 return NULL;
1616 }
1617
1618 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1619 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1620 return NULL;
1621 }
1622
1623 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1624 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1625 return NULL;
1626 }
1627
1628 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1629 if (lib_arch.name!=NULL) {
1630 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1631 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1632 lib_arch.name, arch_array[running_arch_index].name);
1633 } else {
1634 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1635 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1636 lib_arch.code,
1637 arch_array[running_arch_index].name);
1638 }
1639 }
1640
1641 return NULL;
1642 }
1643
1644 void* os::dll_lookup(void* handle, const char* name) {
1645 return dlsym(handle, name);
1646 }
1647
1648 void* os::get_default_process_handle() {
1649 return (void*)::dlopen(NULL, RTLD_LAZY);
1650 }
1651
1652 static inline time_t get_mtime(const char* filename) {
1653 struct stat st;
1654 int ret = os::stat(filename, &st);
1655 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1656 return st.st_mtime;
1657 }
1658
1659 int os::compare_file_modified_times(const char* file1, const char* file2) {
1660 time_t t1 = get_mtime(file1);
1661 time_t t2 = get_mtime(file2);
1662 return t1 - t2;
1663 }
1664
1665 static bool _print_ascii_file(const char* filename, outputStream* st) {
1666 int fd = ::open(filename, O_RDONLY);
1667 if (fd == -1) {
1668 return false;
1669 }
1670
1671 char buf[32];
1672 int bytes;
1673 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1674 st->print_raw(buf, bytes);
1675 }
1676
1677 ::close(fd);
1678
1679 return true;
1680 }
1681
1682 void os::print_os_info_brief(outputStream* st) {
1683 os::Solaris::print_distro_info(st);
1684
1685 os::Posix::print_uname_info(st);
1686
1687 os::Solaris::print_libversion_info(st);
1688 }
1689
1690 void os::print_os_info(outputStream* st) {
1691 st->print("OS:");
1692
1693 os::Solaris::print_distro_info(st);
1694
1695 os::Posix::print_uname_info(st);
1696
1697 os::Solaris::print_libversion_info(st);
1698
1699 os::Posix::print_rlimit_info(st);
1700
1701 os::Posix::print_load_average(st);
1702 }
1703
1704 void os::Solaris::print_distro_info(outputStream* st) {
1705 if (!_print_ascii_file("/etc/release", st)) {
1706 st->print("Solaris");
1707 }
1708 st->cr();
1709 }
1710
1711 void os::get_summary_os_info(char* buf, size_t buflen) {
1712 strncpy(buf, "Solaris", buflen); // default to plain solaris
1713 FILE* fp = fopen("/etc/release", "r");
1714 if (fp != NULL) {
1715 char tmp[256];
1716 // Only get the first line and chop out everything but the os name.
1717 if (fgets(tmp, sizeof(tmp), fp)) {
1718 char* ptr = tmp;
1719 // skip past whitespace characters
1720 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1721 if (*ptr != '\0') {
1722 char* nl = strchr(ptr, '\n');
1723 if (nl != NULL) *nl = '\0';
1724 strncpy(buf, ptr, buflen);
1725 }
1726 }
1727 fclose(fp);
1728 }
1729 }
1730
1731 void os::Solaris::print_libversion_info(outputStream* st) {
1732 st->print(" (T2 libthread)");
1733 st->cr();
1734 }
1735
1736 static bool check_addr0(outputStream* st) {
1737 jboolean status = false;
1738 const int read_chunk = 200;
1739 int ret = 0;
1740 int nmap = 0;
1741 int fd = ::open("/proc/self/map",O_RDONLY);
1742 if (fd >= 0) {
1743 prmap_t *p = NULL;
1744 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1745 if (NULL == mbuff) {
1746 ::close(fd);
1747 return status;
1748 }
1749 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1750 //check if read() has not read partial data
1751 if( 0 != ret % sizeof(prmap_t)){
1752 break;
1753 }
1754 nmap = ret / sizeof(prmap_t);
1755 p = (prmap_t *)mbuff;
1756 for(int i = 0; i < nmap; i++){
1757 if (p->pr_vaddr == 0x0) {
1758 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1759 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1760 st->print("Access: ");
1761 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1762 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1763 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1764 st->cr();
1765 status = true;
1766 }
1767 p++;
1768 }
1769 }
1770 free(mbuff);
1771 ::close(fd);
1772 }
1773 return status;
1774 }
1775
1776 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1777 // Get MHz with system call. We don't seem to already have this.
1778 processor_info_t stats;
1779 processorid_t id = getcpuid();
1780 int clock = 0;
1781 if (processor_info(id, &stats) != -1) {
1782 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1783 }
1784 #ifdef AMD64
1785 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1786 #else
1787 // must be sparc
1788 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1789 #endif
1790 }
1791
1792 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1793 // Nothing to do for now.
1794 }
1795
1796 void os::print_memory_info(outputStream* st) {
1797 st->print("Memory:");
1798 st->print(" %dk page", os::vm_page_size()>>10);
1799 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1800 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1801 st->cr();
1802 (void) check_addr0(st);
1803 }
1804
1805 // Moved from whole group, because we need them here for diagnostic
1806 // prints.
1807 static int Maxsignum = 0;
1808 static int *ourSigFlags = NULL;
1809
1810 int os::Solaris::get_our_sigflags(int sig) {
1811 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1812 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1813 return ourSigFlags[sig];
1814 }
1815
1816 void os::Solaris::set_our_sigflags(int sig, int flags) {
1817 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1818 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1819 ourSigFlags[sig] = flags;
1820 }
1821
1822
1823 static const char* get_signal_handler_name(address handler,
1824 char* buf, int buflen) {
1825 int offset;
1826 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1827 if (found) {
1828 // skip directory names
1829 const char *p1, *p2;
1830 p1 = buf;
1831 size_t len = strlen(os::file_separator());
1832 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1833 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1834 } else {
1835 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1836 }
1837 return buf;
1838 }
1839
1840 static void print_signal_handler(outputStream* st, int sig,
1841 char* buf, size_t buflen) {
1842 struct sigaction sa;
1843
1844 sigaction(sig, NULL, &sa);
1845
1846 st->print("%s: ", os::exception_name(sig, buf, buflen));
1847
1848 address handler = (sa.sa_flags & SA_SIGINFO)
1849 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1850 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1851
1852 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1853 st->print("SIG_DFL");
1854 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1855 st->print("SIG_IGN");
1856 } else {
1857 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1858 }
1859
1860 st->print(", sa_mask[0]=");
1861 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1862
1863 address rh = VMError::get_resetted_sighandler(sig);
1864 // May be, handler was resetted by VMError?
1865 if (rh != NULL) {
1866 handler = rh;
1867 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1868 }
1869
1870 st->print(", sa_flags=");
1871 os::Posix::print_sa_flags(st, sa.sa_flags);
1872
1873 // Check: is it our handler?
1874 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1875 // It is our signal handler
1876 // check for flags
1877 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1878 st->print(
1879 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1880 os::Solaris::get_our_sigflags(sig));
1881 }
1882 }
1883 st->cr();
1884 }
1885
1886 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1887 st->print_cr("Signal Handlers:");
1888 print_signal_handler(st, SIGSEGV, buf, buflen);
1889 print_signal_handler(st, SIGBUS , buf, buflen);
1890 print_signal_handler(st, SIGFPE , buf, buflen);
1891 print_signal_handler(st, SIGPIPE, buf, buflen);
1892 print_signal_handler(st, SIGXFSZ, buf, buflen);
1893 print_signal_handler(st, SIGILL , buf, buflen);
1894 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1895 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1896 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1897 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1898 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1899 }
1900
1901 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1902
1903 // Find the full path to the current module, libjvm.so
1904 void os::jvm_path(char *buf, jint buflen) {
1905 // Error checking.
1906 if (buflen < MAXPATHLEN) {
1907 assert(false, "must use a large-enough buffer");
1908 buf[0] = '\0';
1909 return;
1910 }
1911 // Lazy resolve the path to current module.
1912 if (saved_jvm_path[0] != 0) {
1913 strcpy(buf, saved_jvm_path);
1914 return;
1915 }
1916
1917 Dl_info dlinfo;
1918 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1919 assert(ret != 0, "cannot locate libjvm");
1920 if (ret != 0 && dlinfo.dli_fname != NULL) {
1921 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1922 return;
1923 }
1924 } else {
1925 buf[0] = '\0';
1926 return;
1927 }
1928
1929 if (Arguments::sun_java_launcher_is_altjvm()) {
1930 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1931 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1932 // If "/jre/lib/" appears at the right place in the string, then
1933 // assume we are installed in a JDK and we're done. Otherwise, check
1934 // for a JAVA_HOME environment variable and fix up the path so it
1935 // looks like libjvm.so is installed there (append a fake suffix
1936 // hotspot/libjvm.so).
1937 const char *p = buf + strlen(buf) - 1;
1938 for (int count = 0; p > buf && count < 5; ++count) {
1939 for (--p; p > buf && *p != '/'; --p)
1940 /* empty */ ;
1941 }
1942
1943 if (strncmp(p, "/jre/lib/", 9) != 0) {
1944 // Look for JAVA_HOME in the environment.
1945 char* java_home_var = ::getenv("JAVA_HOME");
1946 if (java_home_var != NULL && java_home_var[0] != 0) {
1947 char* jrelib_p;
1948 int len;
1949
1950 // Check the current module name "libjvm.so".
1951 p = strrchr(buf, '/');
1952 assert(strstr(p, "/libjvm") == p, "invalid library name");
1953
1954 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
1955 return;
1956 }
1957 // determine if this is a legacy image or modules image
1958 // modules image doesn't have "jre" subdirectory
1959 len = strlen(buf);
1960 assert(len < buflen, "Ran out of buffer space");
1961 jrelib_p = buf + len;
1962 snprintf(jrelib_p, buflen-len, "/jre/lib");
1963 if (0 != access(buf, F_OK)) {
1964 snprintf(jrelib_p, buflen-len, "/lib");
1965 }
1966
1967 if (0 == access(buf, F_OK)) {
1968 // Use current module name "libjvm.so"
1969 len = strlen(buf);
1970 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1971 } else {
1972 // Go back to path of .so
1973 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1974 return;
1975 }
1976 }
1977 }
1978 }
1979 }
1980
1981 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1982 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1983 }
1984
1985
1986 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1987 // no prefix required, not even "_"
1988 }
1989
1990
1991 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1992 // no suffix required
1993 }
1994
1995 // sun.misc.Signal
1996
1997 extern "C" {
1998 static void UserHandler(int sig, void *siginfo, void *context) {
1999 // Ctrl-C is pressed during error reporting, likely because the error
2000 // handler fails to abort. Let VM die immediately.
2001 if (sig == SIGINT && VMError::is_error_reported()) {
2002 os::die();
2003 }
2004
2005 os::signal_notify(sig);
2006 // We do not need to reinstate the signal handler each time...
2007 }
2008 }
2009
2010 void* os::user_handler() {
2011 return CAST_FROM_FN_PTR(void*, UserHandler);
2012 }
2013
2014 extern "C" {
2015 typedef void (*sa_handler_t)(int);
2016 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2017 }
2018
2019 void* os::signal(int signal_number, void* handler) {
2020 struct sigaction sigAct, oldSigAct;
2021 sigfillset(&(sigAct.sa_mask));
2022 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2023 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2024
2025 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2026 // -1 means registration failed
2027 return (void *)-1;
2028 }
2029
2030 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2031 }
2032
2033 void os::signal_raise(int signal_number) {
2034 raise(signal_number);
2035 }
2036
2037 // The following code is moved from os.cpp for making this
2038 // code platform specific, which it is by its very nature.
2039
2040 // a counter for each possible signal value
2041 static int Sigexit = 0;
2042 static jint *pending_signals = NULL;
2043 static int *preinstalled_sigs = NULL;
2044 static struct sigaction *chainedsigactions = NULL;
2045 static Semaphore* sig_sem = NULL;
2046
2047 int os::sigexitnum_pd() {
2048 assert(Sigexit > 0, "signal memory not yet initialized");
2049 return Sigexit;
2050 }
2051
2052 void os::Solaris::init_signal_mem() {
2053 // Initialize signal structures
2054 Maxsignum = SIGRTMAX;
2055 Sigexit = Maxsignum+1;
2056 assert(Maxsignum >0, "Unable to obtain max signal number");
2057
2058 // Initialize signal structures
2059 // pending_signals has one int per signal
2060 // The additional signal is for SIGEXIT - exit signal to signal_thread
2061 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2062 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2063
2064 if (UseSignalChaining) {
2065 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2066 * (Maxsignum + 1), mtInternal);
2067 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2068 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2069 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2070 }
2071 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2072 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2073 }
2074
2075 static void jdk_misc_signal_init() {
2076 // Initialize signal semaphore
2077 sig_sem = new Semaphore();
2078 }
2079
2080 void os::signal_notify(int sig) {
2081 if (sig_sem != NULL) {
2082 Atomic::inc(&pending_signals[sig]);
2083 sig_sem->signal();
2084 } else {
2085 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2086 // initialization isn't called.
2087 assert(ReduceSignalUsage, "signal semaphore should be created");
2088 }
2089 }
2090
2091 static int check_pending_signals() {
2092 int ret;
2093 while (true) {
2094 for (int i = 0; i < Sigexit + 1; i++) {
2095 jint n = pending_signals[i];
2096 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2097 return i;
2098 }
2099 }
2100 JavaThread *thread = JavaThread::current();
2101 ThreadBlockInVM tbivm(thread);
2102
2103 bool threadIsSuspended;
2104 do {
2105 thread->set_suspend_equivalent();
2106 sig_sem->wait();
2107
2108 // were we externally suspended while we were waiting?
2109 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2110 if (threadIsSuspended) {
2111 // The semaphore has been incremented, but while we were waiting
2112 // another thread suspended us. We don't want to continue running
2113 // while suspended because that would surprise the thread that
2114 // suspended us.
2115 sig_sem->signal();
2116
2117 thread->java_suspend_self();
2118 }
2119 } while (threadIsSuspended);
2120 }
2121 }
2122
2123 int os::signal_wait() {
2124 return check_pending_signals();
2125 }
2126
2127 ////////////////////////////////////////////////////////////////////////////////
2128 // Virtual Memory
2129
2130 static int page_size = -1;
2131
2132 int os::vm_page_size() {
2133 assert(page_size != -1, "must call os::init");
2134 return page_size;
2135 }
2136
2137 // Solaris allocates memory by pages.
2138 int os::vm_allocation_granularity() {
2139 assert(page_size != -1, "must call os::init");
2140 return page_size;
2141 }
2142
2143 static bool recoverable_mmap_error(int err) {
2144 // See if the error is one we can let the caller handle. This
2145 // list of errno values comes from the Solaris mmap(2) man page.
2146 switch (err) {
2147 case EBADF:
2148 case EINVAL:
2149 case ENOTSUP:
2150 // let the caller deal with these errors
2151 return true;
2152
2153 default:
2154 // Any remaining errors on this OS can cause our reserved mapping
2155 // to be lost. That can cause confusion where different data
2156 // structures think they have the same memory mapped. The worst
2157 // scenario is if both the VM and a library think they have the
2158 // same memory mapped.
2159 return false;
2160 }
2161 }
2162
2163 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2164 int err) {
2165 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2166 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2167 os::strerror(err), err);
2168 }
2169
2170 static void warn_fail_commit_memory(char* addr, size_t bytes,
2171 size_t alignment_hint, bool exec,
2172 int err) {
2173 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2174 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2175 alignment_hint, exec, os::strerror(err), err);
2176 }
2177
2178 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2179 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2180 size_t size = bytes;
2181 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2182 if (res != NULL) {
2183 if (UseNUMAInterleaving) {
2184 numa_make_global(addr, bytes);
2185 }
2186 return 0;
2187 }
2188
2189 int err = errno; // save errno from mmap() call in mmap_chunk()
2190
2191 if (!recoverable_mmap_error(err)) {
2192 warn_fail_commit_memory(addr, bytes, exec, err);
2193 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2194 }
2195
2196 return err;
2197 }
2198
2199 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2200 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2201 }
2202
2203 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2204 const char* mesg) {
2205 assert(mesg != NULL, "mesg must be specified");
2206 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2207 if (err != 0) {
2208 // the caller wants all commit errors to exit with the specified mesg:
2209 warn_fail_commit_memory(addr, bytes, exec, err);
2210 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2211 }
2212 }
2213
2214 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2215 assert(is_aligned(alignment, (size_t) vm_page_size()),
2216 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2217 alignment, (size_t) vm_page_size());
2218
2219 for (int i = 0; _page_sizes[i] != 0; i++) {
2220 if (is_aligned(alignment, _page_sizes[i])) {
2221 return _page_sizes[i];
2222 }
2223 }
2224
2225 return (size_t) vm_page_size();
2226 }
2227
2228 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2229 size_t alignment_hint, bool exec) {
2230 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2231 if (err == 0 && UseLargePages && alignment_hint > 0) {
2232 assert(is_aligned(bytes, alignment_hint),
2233 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2234
2235 // The syscall memcntl requires an exact page size (see man memcntl for details).
2236 size_t page_size = page_size_for_alignment(alignment_hint);
2237 if (page_size > (size_t) vm_page_size()) {
2238 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2239 }
2240 }
2241 return err;
2242 }
2243
2244 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2245 bool exec) {
2246 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2247 }
2248
2249 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2250 size_t alignment_hint, bool exec,
2251 const char* mesg) {
2252 assert(mesg != NULL, "mesg must be specified");
2253 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2254 if (err != 0) {
2255 // the caller wants all commit errors to exit with the specified mesg:
2256 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2257 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2258 }
2259 }
2260
2261 // Uncommit the pages in a specified region.
2262 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2263 if (madvise(addr, bytes, MADV_FREE) < 0) {
2264 debug_only(warning("MADV_FREE failed."));
2265 return;
2266 }
2267 }
2268
2269 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2270 return os::commit_memory(addr, size, !ExecMem);
2271 }
2272
2273 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2274 return os::uncommit_memory(addr, size);
2275 }
2276
2277 // Change the page size in a given range.
2278 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2279 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2280 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2281 if (UseLargePages) {
2282 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2283 if (page_size > (size_t) vm_page_size()) {
2284 Solaris::setup_large_pages(addr, bytes, page_size);
2285 }
2286 }
2287 }
2288
2289 // Tell the OS to make the range local to the first-touching LWP
2290 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2291 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2292 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2293 debug_only(warning("MADV_ACCESS_LWP failed."));
2294 }
2295 }
2296
2297 // Tell the OS that this range would be accessed from different LWPs.
2298 void os::numa_make_global(char *addr, size_t bytes) {
2299 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2300 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2301 debug_only(warning("MADV_ACCESS_MANY failed."));
2302 }
2303 }
2304
2305 // Get the number of the locality groups.
2306 size_t os::numa_get_groups_num() {
2307 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2308 return n != -1 ? n : 1;
2309 }
2310
2311 // Get a list of leaf locality groups. A leaf lgroup is group that
2312 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2313 // board. An LWP is assigned to one of these groups upon creation.
2314 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2315 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2316 ids[0] = 0;
2317 return 1;
2318 }
2319 int result_size = 0, top = 1, bottom = 0, cur = 0;
2320 for (int k = 0; k < size; k++) {
2321 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2322 (Solaris::lgrp_id_t*)&ids[top], size - top);
2323 if (r == -1) {
2324 ids[0] = 0;
2325 return 1;
2326 }
2327 if (!r) {
2328 // That's a leaf node.
2329 assert(bottom <= cur, "Sanity check");
2330 // Check if the node has memory
2331 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2332 NULL, 0, LGRP_RSRC_MEM) > 0) {
2333 ids[bottom++] = ids[cur];
2334 }
2335 }
2336 top += r;
2337 cur++;
2338 }
2339 if (bottom == 0) {
2340 // Handle a situation, when the OS reports no memory available.
2341 // Assume UMA architecture.
2342 ids[0] = 0;
2343 return 1;
2344 }
2345 return bottom;
2346 }
2347
2348 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2349 bool os::numa_topology_changed() {
2350 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2351 if (is_stale != -1 && is_stale) {
2352 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2353 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2354 assert(c != 0, "Failure to initialize LGRP API");
2355 Solaris::set_lgrp_cookie(c);
2356 return true;
2357 }
2358 return false;
2359 }
2360
2361 // Get the group id of the current LWP.
2362 int os::numa_get_group_id() {
2363 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2364 if (lgrp_id == -1) {
2365 return 0;
2366 }
2367 const int size = os::numa_get_groups_num();
2368 int *ids = (int*)alloca(size * sizeof(int));
2369
2370 // Get the ids of all lgroups with memory; r is the count.
2371 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2372 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2373 if (r <= 0) {
2374 return 0;
2375 }
2376 return ids[os::random() % r];
2377 }
2378
2379 // Request information about the page.
2380 bool os::get_page_info(char *start, page_info* info) {
2381 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2382 uint64_t addr = (uintptr_t)start;
2383 uint64_t outdata[2];
2384 uint_t validity = 0;
2385
2386 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2387 return false;
2388 }
2389
2390 info->size = 0;
2391 info->lgrp_id = -1;
2392
2393 if ((validity & 1) != 0) {
2394 if ((validity & 2) != 0) {
2395 info->lgrp_id = outdata[0];
2396 }
2397 if ((validity & 4) != 0) {
2398 info->size = outdata[1];
2399 }
2400 return true;
2401 }
2402 return false;
2403 }
2404
2405 // Scan the pages from start to end until a page different than
2406 // the one described in the info parameter is encountered.
2407 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2408 page_info* page_found) {
2409 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2410 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2411 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2412 uint_t validity[MAX_MEMINFO_CNT];
2413
2414 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2415 uint64_t p = (uint64_t)start;
2416 while (p < (uint64_t)end) {
2417 addrs[0] = p;
2418 size_t addrs_count = 1;
2419 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2420 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2421 addrs_count++;
2422 }
2423
2424 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2425 return NULL;
2426 }
2427
2428 size_t i = 0;
2429 for (; i < addrs_count; i++) {
2430 if ((validity[i] & 1) != 0) {
2431 if ((validity[i] & 4) != 0) {
2432 if (outdata[types * i + 1] != page_expected->size) {
2433 break;
2434 }
2435 } else if (page_expected->size != 0) {
2436 break;
2437 }
2438
2439 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2440 if (outdata[types * i] != page_expected->lgrp_id) {
2441 break;
2442 }
2443 }
2444 } else {
2445 return NULL;
2446 }
2447 }
2448
2449 if (i < addrs_count) {
2450 if ((validity[i] & 2) != 0) {
2451 page_found->lgrp_id = outdata[types * i];
2452 } else {
2453 page_found->lgrp_id = -1;
2454 }
2455 if ((validity[i] & 4) != 0) {
2456 page_found->size = outdata[types * i + 1];
2457 } else {
2458 page_found->size = 0;
2459 }
2460 return (char*)addrs[i];
2461 }
2462
2463 p = addrs[addrs_count - 1] + page_size;
2464 }
2465 return end;
2466 }
2467
2468 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2469 size_t size = bytes;
2470 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2471 // uncommitted page. Otherwise, the read/write might succeed if we
2472 // have enough swap space to back the physical page.
2473 return
2474 NULL != Solaris::mmap_chunk(addr, size,
2475 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2476 PROT_NONE);
2477 }
2478
2479 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2480 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2481
2482 if (b == MAP_FAILED) {
2483 return NULL;
2484 }
2485 return b;
2486 }
2487
2488 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2489 size_t alignment_hint, bool fixed) {
2490 char* addr = requested_addr;
2491 int flags = MAP_PRIVATE | MAP_NORESERVE;
2492
2493 assert(!(fixed && (alignment_hint > 0)),
2494 "alignment hint meaningless with fixed mmap");
2495
2496 if (fixed) {
2497 flags |= MAP_FIXED;
2498 } else if (alignment_hint > (size_t) vm_page_size()) {
2499 flags |= MAP_ALIGN;
2500 addr = (char*) alignment_hint;
2501 }
2502
2503 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2504 // uncommitted page. Otherwise, the read/write might succeed if we
2505 // have enough swap space to back the physical page.
2506 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2507 }
2508
2509 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2510 size_t alignment_hint) {
2511 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2512 (requested_addr != NULL));
2513
2514 guarantee(requested_addr == NULL || requested_addr == addr,
2515 "OS failed to return requested mmap address.");
2516 return addr;
2517 }
2518
2519 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2520 assert(file_desc >= 0, "file_desc is not valid");
2521 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2522 if (result != NULL) {
2523 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2524 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2525 }
2526 }
2527 return result;
2528 }
2529
2530 // Reserve memory at an arbitrary address, only if that area is
2531 // available (and not reserved for something else).
2532
2533 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2534 const int max_tries = 10;
2535 char* base[max_tries];
2536 size_t size[max_tries];
2537
2538 // Solaris adds a gap between mmap'ed regions. The size of the gap
2539 // is dependent on the requested size and the MMU. Our initial gap
2540 // value here is just a guess and will be corrected later.
2541 bool had_top_overlap = false;
2542 bool have_adjusted_gap = false;
2543 size_t gap = 0x400000;
2544
2545 // Assert only that the size is a multiple of the page size, since
2546 // that's all that mmap requires, and since that's all we really know
2547 // about at this low abstraction level. If we need higher alignment,
2548 // we can either pass an alignment to this method or verify alignment
2549 // in one of the methods further up the call chain. See bug 5044738.
2550 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2551
2552 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2553 // Give it a try, if the kernel honors the hint we can return immediately.
2554 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2555
2556 volatile int err = errno;
2557 if (addr == requested_addr) {
2558 return addr;
2559 } else if (addr != NULL) {
2560 pd_unmap_memory(addr, bytes);
2561 }
2562
2563 if (log_is_enabled(Warning, os)) {
2564 char buf[256];
2565 buf[0] = '\0';
2566 if (addr == NULL) {
2567 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2568 }
2569 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2570 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2571 "%s", bytes, requested_addr, addr, buf);
2572 }
2573
2574 // Address hint method didn't work. Fall back to the old method.
2575 // In theory, once SNV becomes our oldest supported platform, this
2576 // code will no longer be needed.
2577 //
2578 // Repeatedly allocate blocks until the block is allocated at the
2579 // right spot. Give up after max_tries.
2580 int i;
2581 for (i = 0; i < max_tries; ++i) {
2582 base[i] = reserve_memory(bytes);
2583
2584 if (base[i] != NULL) {
2585 // Is this the block we wanted?
2586 if (base[i] == requested_addr) {
2587 size[i] = bytes;
2588 break;
2589 }
2590
2591 // check that the gap value is right
2592 if (had_top_overlap && !have_adjusted_gap) {
2593 size_t actual_gap = base[i-1] - base[i] - bytes;
2594 if (gap != actual_gap) {
2595 // adjust the gap value and retry the last 2 allocations
2596 assert(i > 0, "gap adjustment code problem");
2597 have_adjusted_gap = true; // adjust the gap only once, just in case
2598 gap = actual_gap;
2599 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2600 unmap_memory(base[i], bytes);
2601 unmap_memory(base[i-1], size[i-1]);
2602 i-=2;
2603 continue;
2604 }
2605 }
2606
2607 // Does this overlap the block we wanted? Give back the overlapped
2608 // parts and try again.
2609 //
2610 // There is still a bug in this code: if top_overlap == bytes,
2611 // the overlap is offset from requested region by the value of gap.
2612 // In this case giving back the overlapped part will not work,
2613 // because we'll give back the entire block at base[i] and
2614 // therefore the subsequent allocation will not generate a new gap.
2615 // This could be fixed with a new algorithm that used larger
2616 // or variable size chunks to find the requested region -
2617 // but such a change would introduce additional complications.
2618 // It's rare enough that the planets align for this bug,
2619 // so we'll just wait for a fix for 6204603/5003415 which
2620 // will provide a mmap flag to allow us to avoid this business.
2621
2622 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2623 if (top_overlap >= 0 && top_overlap < bytes) {
2624 had_top_overlap = true;
2625 unmap_memory(base[i], top_overlap);
2626 base[i] += top_overlap;
2627 size[i] = bytes - top_overlap;
2628 } else {
2629 size_t bottom_overlap = base[i] + bytes - requested_addr;
2630 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2631 if (bottom_overlap == 0) {
2632 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2633 }
2634 unmap_memory(requested_addr, bottom_overlap);
2635 size[i] = bytes - bottom_overlap;
2636 } else {
2637 size[i] = bytes;
2638 }
2639 }
2640 }
2641 }
2642
2643 // Give back the unused reserved pieces.
2644
2645 for (int j = 0; j < i; ++j) {
2646 if (base[j] != NULL) {
2647 unmap_memory(base[j], size[j]);
2648 }
2649 }
2650
2651 return (i < max_tries) ? requested_addr : NULL;
2652 }
2653
2654 bool os::pd_release_memory(char* addr, size_t bytes) {
2655 size_t size = bytes;
2656 return munmap(addr, size) == 0;
2657 }
2658
2659 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2660 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2661 "addr must be page aligned");
2662 int retVal = mprotect(addr, bytes, prot);
2663 return retVal == 0;
2664 }
2665
2666 // Protect memory (Used to pass readonly pages through
2667 // JNI GetArray<type>Elements with empty arrays.)
2668 // Also, used for serialization page and for compressed oops null pointer
2669 // checking.
2670 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2671 bool is_committed) {
2672 unsigned int p = 0;
2673 switch (prot) {
2674 case MEM_PROT_NONE: p = PROT_NONE; break;
2675 case MEM_PROT_READ: p = PROT_READ; break;
2676 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2677 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2678 default:
2679 ShouldNotReachHere();
2680 }
2681 // is_committed is unused.
2682 return solaris_mprotect(addr, bytes, p);
2683 }
2684
2685 // guard_memory and unguard_memory only happens within stack guard pages.
2686 // Since ISM pertains only to the heap, guard and unguard memory should not
2687 /// happen with an ISM region.
2688 bool os::guard_memory(char* addr, size_t bytes) {
2689 return solaris_mprotect(addr, bytes, PROT_NONE);
2690 }
2691
2692 bool os::unguard_memory(char* addr, size_t bytes) {
2693 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2694 }
2695
2696 // Large page support
2697 static size_t _large_page_size = 0;
2698
2699 // Insertion sort for small arrays (descending order).
2700 static void insertion_sort_descending(size_t* array, int len) {
2701 for (int i = 0; i < len; i++) {
2702 size_t val = array[i];
2703 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2704 size_t tmp = array[key];
2705 array[key] = array[key - 1];
2706 array[key - 1] = tmp;
2707 }
2708 }
2709 }
2710
2711 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2712 const unsigned int usable_count = VM_Version::page_size_count();
2713 if (usable_count == 1) {
2714 return false;
2715 }
2716
2717 // Find the right getpagesizes interface. When solaris 11 is the minimum
2718 // build platform, getpagesizes() (without the '2') can be called directly.
2719 typedef int (*gps_t)(size_t[], int);
2720 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2721 if (gps_func == NULL) {
2722 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2723 if (gps_func == NULL) {
2724 if (warn) {
2725 warning("MPSS is not supported by the operating system.");
2726 }
2727 return false;
2728 }
2729 }
2730
2731 // Fill the array of page sizes.
2732 int n = (*gps_func)(_page_sizes, page_sizes_max);
2733 assert(n > 0, "Solaris bug?");
2734
2735 if (n == page_sizes_max) {
2736 // Add a sentinel value (necessary only if the array was completely filled
2737 // since it is static (zeroed at initialization)).
2738 _page_sizes[--n] = 0;
2739 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2740 }
2741 assert(_page_sizes[n] == 0, "missing sentinel");
2742 trace_page_sizes("available page sizes", _page_sizes, n);
2743
2744 if (n == 1) return false; // Only one page size available.
2745
2746 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2747 // select up to usable_count elements. First sort the array, find the first
2748 // acceptable value, then copy the usable sizes to the top of the array and
2749 // trim the rest. Make sure to include the default page size :-).
2750 //
2751 // A better policy could get rid of the 4M limit by taking the sizes of the
2752 // important VM memory regions (java heap and possibly the code cache) into
2753 // account.
2754 insertion_sort_descending(_page_sizes, n);
2755 const size_t size_limit =
2756 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2757 int beg;
2758 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2759 const int end = MIN2((int)usable_count, n) - 1;
2760 for (int cur = 0; cur < end; ++cur, ++beg) {
2761 _page_sizes[cur] = _page_sizes[beg];
2762 }
2763 _page_sizes[end] = vm_page_size();
2764 _page_sizes[end + 1] = 0;
2765
2766 if (_page_sizes[end] > _page_sizes[end - 1]) {
2767 // Default page size is not the smallest; sort again.
2768 insertion_sort_descending(_page_sizes, end + 1);
2769 }
2770 *page_size = _page_sizes[0];
2771
2772 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2773 return true;
2774 }
2775
2776 void os::large_page_init() {
2777 if (UseLargePages) {
2778 // print a warning if any large page related flag is specified on command line
2779 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2780 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2781
2782 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2783 }
2784 }
2785
2786 bool os::Solaris::is_valid_page_size(size_t bytes) {
2787 for (int i = 0; _page_sizes[i] != 0; i++) {
2788 if (_page_sizes[i] == bytes) {
2789 return true;
2790 }
2791 }
2792 return false;
2793 }
2794
2795 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2796 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2797 assert(is_aligned((void*) start, align),
2798 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2799 assert(is_aligned(bytes, align),
2800 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2801
2802 // Signal to OS that we want large pages for addresses
2803 // from addr, addr + bytes
2804 struct memcntl_mha mpss_struct;
2805 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2806 mpss_struct.mha_pagesize = align;
2807 mpss_struct.mha_flags = 0;
2808 // Upon successful completion, memcntl() returns 0
2809 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2810 debug_only(warning("Attempt to use MPSS failed."));
2811 return false;
2812 }
2813 return true;
2814 }
2815
2816 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2817 fatal("os::reserve_memory_special should not be called on Solaris.");
2818 return NULL;
2819 }
2820
2821 bool os::release_memory_special(char* base, size_t bytes) {
2822 fatal("os::release_memory_special should not be called on Solaris.");
2823 return false;
2824 }
2825
2826 size_t os::large_page_size() {
2827 return _large_page_size;
2828 }
2829
2830 // MPSS allows application to commit large page memory on demand; with ISM
2831 // the entire memory region must be allocated as shared memory.
2832 bool os::can_commit_large_page_memory() {
2833 return true;
2834 }
2835
2836 bool os::can_execute_large_page_memory() {
2837 return true;
2838 }
2839
2840 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2841 void os::infinite_sleep() {
2842 while (true) { // sleep forever ...
2843 ::sleep(100); // ... 100 seconds at a time
2844 }
2845 }
2846
2847 // Used to convert frequent JVM_Yield() to nops
2848 bool os::dont_yield() {
2849 if (DontYieldALot) {
2850 static hrtime_t last_time = 0;
2851 hrtime_t diff = getTimeNanos() - last_time;
2852
2853 if (diff < DontYieldALotInterval * 1000000) {
2854 return true;
2855 }
2856
2857 last_time += diff;
2858
2859 return false;
2860 } else {
2861 return false;
2862 }
2863 }
2864
2865 // Note that yield semantics are defined by the scheduling class to which
2866 // the thread currently belongs. Typically, yield will _not yield to
2867 // other equal or higher priority threads that reside on the dispatch queues
2868 // of other CPUs.
2869
2870 void os::naked_yield() {
2871 thr_yield();
2872 }
2873
2874 // Interface for setting lwp priorities. We are using T2 libthread,
2875 // which forces the use of bound threads, so all of our threads will
2876 // be assigned to real lwp's. Using the thr_setprio function is
2877 // meaningless in this mode so we must adjust the real lwp's priority.
2878 // The routines below implement the getting and setting of lwp priorities.
2879 //
2880 // Note: There are three priority scales used on Solaris. Java priotities
2881 // which range from 1 to 10, libthread "thr_setprio" scale which range
2882 // from 0 to 127, and the current scheduling class of the process we
2883 // are running in. This is typically from -60 to +60.
2884 // The setting of the lwp priorities in done after a call to thr_setprio
2885 // so Java priorities are mapped to libthread priorities and we map from
2886 // the latter to lwp priorities. We don't keep priorities stored in
2887 // Java priorities since some of our worker threads want to set priorities
2888 // higher than all Java threads.
2889 //
2890 // For related information:
2891 // (1) man -s 2 priocntl
2892 // (2) man -s 4 priocntl
2893 // (3) man dispadmin
2894 // = librt.so
2895 // = libthread/common/rtsched.c - thrp_setlwpprio().
2896 // = ps -cL <pid> ... to validate priority.
2897 // = sched_get_priority_min and _max
2898 // pthread_create
2899 // sched_setparam
2900 // pthread_setschedparam
2901 //
2902 // Assumptions:
2903 // + We assume that all threads in the process belong to the same
2904 // scheduling class. IE. an homogenous process.
2905 // + Must be root or in IA group to change change "interactive" attribute.
2906 // Priocntl() will fail silently. The only indication of failure is when
2907 // we read-back the value and notice that it hasn't changed.
2908 // + Interactive threads enter the runq at the head, non-interactive at the tail.
2909 // + For RT, change timeslice as well. Invariant:
2910 // constant "priority integral"
2911 // Konst == TimeSlice * (60-Priority)
2912 // Given a priority, compute appropriate timeslice.
2913 // + Higher numerical values have higher priority.
2914
2915 // sched class attributes
2916 typedef struct {
2917 int schedPolicy; // classID
2918 int maxPrio;
2919 int minPrio;
2920 } SchedInfo;
2921
2922
2923 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
2924
2925 #ifdef ASSERT
2926 static int ReadBackValidate = 1;
2927 #endif
2928 static int myClass = 0;
2929 static int myMin = 0;
2930 static int myMax = 0;
2931 static int myCur = 0;
2932 static bool priocntl_enable = false;
2933
2934 static const int criticalPrio = FXCriticalPriority;
2935 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
2936
2937
2938 // lwp_priocntl_init
2939 //
2940 // Try to determine the priority scale for our process.
2941 //
2942 // Return errno or 0 if OK.
2943 //
2944 static int lwp_priocntl_init() {
2945 int rslt;
2946 pcinfo_t ClassInfo;
2947 pcparms_t ParmInfo;
2948 int i;
2949
2950 if (!UseThreadPriorities) return 0;
2951
2952 // If ThreadPriorityPolicy is 1, switch tables
2953 if (ThreadPriorityPolicy == 1) {
2954 for (i = 0; i < CriticalPriority+1; i++)
2955 os::java_to_os_priority[i] = prio_policy1[i];
2956 }
2957 if (UseCriticalJavaThreadPriority) {
2958 // MaxPriority always maps to the FX scheduling class and criticalPrio.
2959 // See set_native_priority() and set_lwp_class_and_priority().
2960 // Save original MaxPriority mapping in case attempt to
2961 // use critical priority fails.
2962 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
2963 // Set negative to distinguish from other priorities
2964 os::java_to_os_priority[MaxPriority] = -criticalPrio;
2965 }
2966
2967 // Get IDs for a set of well-known scheduling classes.
2968 // TODO-FIXME: GETCLINFO returns the current # of classes in the
2969 // the system. We should have a loop that iterates over the
2970 // classID values, which are known to be "small" integers.
2971
2972 strcpy(ClassInfo.pc_clname, "TS");
2973 ClassInfo.pc_cid = -1;
2974 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2975 if (rslt < 0) return errno;
2976 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
2977 tsLimits.schedPolicy = ClassInfo.pc_cid;
2978 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
2979 tsLimits.minPrio = -tsLimits.maxPrio;
2980
2981 strcpy(ClassInfo.pc_clname, "IA");
2982 ClassInfo.pc_cid = -1;
2983 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2984 if (rslt < 0) return errno;
2985 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
2986 iaLimits.schedPolicy = ClassInfo.pc_cid;
2987 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
2988 iaLimits.minPrio = -iaLimits.maxPrio;
2989
2990 strcpy(ClassInfo.pc_clname, "RT");
2991 ClassInfo.pc_cid = -1;
2992 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2993 if (rslt < 0) return errno;
2994 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
2995 rtLimits.schedPolicy = ClassInfo.pc_cid;
2996 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
2997 rtLimits.minPrio = 0;
2998
2999 strcpy(ClassInfo.pc_clname, "FX");
3000 ClassInfo.pc_cid = -1;
3001 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3002 if (rslt < 0) return errno;
3003 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3004 fxLimits.schedPolicy = ClassInfo.pc_cid;
3005 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3006 fxLimits.minPrio = 0;
3007
3008 // Query our "current" scheduling class.
3009 // This will normally be IA, TS or, rarely, FX or RT.
3010 memset(&ParmInfo, 0, sizeof(ParmInfo));
3011 ParmInfo.pc_cid = PC_CLNULL;
3012 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3013 if (rslt < 0) return errno;
3014 myClass = ParmInfo.pc_cid;
3015
3016 // We now know our scheduling classId, get specific information
3017 // about the class.
3018 ClassInfo.pc_cid = myClass;
3019 ClassInfo.pc_clname[0] = 0;
3020 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3021 if (rslt < 0) return errno;
3022
3023 if (ThreadPriorityVerbose) {
3024 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3025 }
3026
3027 memset(&ParmInfo, 0, sizeof(pcparms_t));
3028 ParmInfo.pc_cid = PC_CLNULL;
3029 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3030 if (rslt < 0) return errno;
3031
3032 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3033 myMin = rtLimits.minPrio;
3034 myMax = rtLimits.maxPrio;
3035 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3036 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3037 myMin = iaLimits.minPrio;
3038 myMax = iaLimits.maxPrio;
3039 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3040 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3041 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3042 myMin = tsLimits.minPrio;
3043 myMax = tsLimits.maxPrio;
3044 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3045 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3046 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3047 myMin = fxLimits.minPrio;
3048 myMax = fxLimits.maxPrio;
3049 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3050 } else {
3051 // No clue - punt
3052 if (ThreadPriorityVerbose) {
3053 tty->print_cr("Unknown scheduling class: %s ... \n",
3054 ClassInfo.pc_clname);
3055 }
3056 return EINVAL; // no clue, punt
3057 }
3058
3059 if (ThreadPriorityVerbose) {
3060 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3061 }
3062
3063 priocntl_enable = true; // Enable changing priorities
3064 return 0;
3065 }
3066
3067 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3068 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3069 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3070 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3071
3072
3073 // scale_to_lwp_priority
3074 //
3075 // Convert from the libthread "thr_setprio" scale to our current
3076 // lwp scheduling class scale.
3077 //
3078 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3079 int v;
3080
3081 if (x == 127) return rMax; // avoid round-down
3082 v = (((x*(rMax-rMin)))/128)+rMin;
3083 return v;
3084 }
3085
3086
3087 // set_lwp_class_and_priority
3088 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3089 int newPrio, int new_class, bool scale) {
3090 int rslt;
3091 int Actual, Expected, prv;
3092 pcparms_t ParmInfo; // for GET-SET
3093 #ifdef ASSERT
3094 pcparms_t ReadBack; // for readback
3095 #endif
3096
3097 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3098 // Query current values.
3099 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3100 // Cache "pcparms_t" in global ParmCache.
3101 // TODO: elide set-to-same-value
3102
3103 // If something went wrong on init, don't change priorities.
3104 if (!priocntl_enable) {
3105 if (ThreadPriorityVerbose) {
3106 tty->print_cr("Trying to set priority but init failed, ignoring");
3107 }
3108 return EINVAL;
3109 }
3110
3111 // If lwp hasn't started yet, just return
3112 // the _start routine will call us again.
3113 if (lwpid <= 0) {
3114 if (ThreadPriorityVerbose) {
3115 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3116 INTPTR_FORMAT " to %d, lwpid not set",
3117 ThreadID, newPrio);
3118 }
3119 return 0;
3120 }
3121
3122 if (ThreadPriorityVerbose) {
3123 tty->print_cr ("set_lwp_class_and_priority("
3124 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3125 ThreadID, lwpid, newPrio);
3126 }
3127
3128 memset(&ParmInfo, 0, sizeof(pcparms_t));
3129 ParmInfo.pc_cid = PC_CLNULL;
3130 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3131 if (rslt < 0) return errno;
3132
3133 int cur_class = ParmInfo.pc_cid;
3134 ParmInfo.pc_cid = (id_t)new_class;
3135
3136 if (new_class == rtLimits.schedPolicy) {
3137 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3138 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3139 rtLimits.maxPrio, newPrio)
3140 : newPrio;
3141 rtInfo->rt_tqsecs = RT_NOCHANGE;
3142 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3143 if (ThreadPriorityVerbose) {
3144 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3145 }
3146 } else if (new_class == iaLimits.schedPolicy) {
3147 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3148 int maxClamped = MIN2(iaLimits.maxPrio,
3149 cur_class == new_class
3150 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3151 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3152 maxClamped, newPrio)
3153 : newPrio;
3154 iaInfo->ia_uprilim = cur_class == new_class
3155 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3156 iaInfo->ia_mode = IA_NOCHANGE;
3157 if (ThreadPriorityVerbose) {
3158 tty->print_cr("IA: [%d...%d] %d->%d\n",
3159 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3160 }
3161 } else if (new_class == tsLimits.schedPolicy) {
3162 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3163 int maxClamped = MIN2(tsLimits.maxPrio,
3164 cur_class == new_class
3165 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3166 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3167 maxClamped, newPrio)
3168 : newPrio;
3169 tsInfo->ts_uprilim = cur_class == new_class
3170 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3171 if (ThreadPriorityVerbose) {
3172 tty->print_cr("TS: [%d...%d] %d->%d\n",
3173 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3174 }
3175 } else if (new_class == fxLimits.schedPolicy) {
3176 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3177 int maxClamped = MIN2(fxLimits.maxPrio,
3178 cur_class == new_class
3179 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3180 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3181 maxClamped, newPrio)
3182 : newPrio;
3183 fxInfo->fx_uprilim = cur_class == new_class
3184 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3185 fxInfo->fx_tqsecs = FX_NOCHANGE;
3186 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3187 if (ThreadPriorityVerbose) {
3188 tty->print_cr("FX: [%d...%d] %d->%d\n",
3189 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3190 }
3191 } else {
3192 if (ThreadPriorityVerbose) {
3193 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3194 }
3195 return EINVAL; // no clue, punt
3196 }
3197
3198 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3199 if (ThreadPriorityVerbose && rslt) {
3200 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3201 }
3202 if (rslt < 0) return errno;
3203
3204 #ifdef ASSERT
3205 // Sanity check: read back what we just attempted to set.
3206 // In theory it could have changed in the interim ...
3207 //
3208 // The priocntl system call is tricky.
3209 // Sometimes it'll validate the priority value argument and
3210 // return EINVAL if unhappy. At other times it fails silently.
3211 // Readbacks are prudent.
3212
3213 if (!ReadBackValidate) return 0;
3214
3215 memset(&ReadBack, 0, sizeof(pcparms_t));
3216 ReadBack.pc_cid = PC_CLNULL;
3217 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3218 assert(rslt >= 0, "priocntl failed");
3219 Actual = Expected = 0xBAD;
3220 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3221 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3222 Actual = RTPRI(ReadBack)->rt_pri;
3223 Expected = RTPRI(ParmInfo)->rt_pri;
3224 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3225 Actual = IAPRI(ReadBack)->ia_upri;
3226 Expected = IAPRI(ParmInfo)->ia_upri;
3227 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3228 Actual = TSPRI(ReadBack)->ts_upri;
3229 Expected = TSPRI(ParmInfo)->ts_upri;
3230 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3231 Actual = FXPRI(ReadBack)->fx_upri;
3232 Expected = FXPRI(ParmInfo)->fx_upri;
3233 } else {
3234 if (ThreadPriorityVerbose) {
3235 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3236 ParmInfo.pc_cid);
3237 }
3238 }
3239
3240 if (Actual != Expected) {
3241 if (ThreadPriorityVerbose) {
3242 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3243 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3244 }
3245 }
3246 #endif
3247
3248 return 0;
3249 }
3250
3251 // Solaris only gives access to 128 real priorities at a time,
3252 // so we expand Java's ten to fill this range. This would be better
3253 // if we dynamically adjusted relative priorities.
3254 //
3255 // The ThreadPriorityPolicy option allows us to select 2 different
3256 // priority scales.
3257 //
3258 // ThreadPriorityPolicy=0
3259 // Since the Solaris' default priority is MaximumPriority, we do not
3260 // set a priority lower than Max unless a priority lower than
3261 // NormPriority is requested.
3262 //
3263 // ThreadPriorityPolicy=1
3264 // This mode causes the priority table to get filled with
3265 // linear values. NormPriority get's mapped to 50% of the
3266 // Maximum priority an so on. This will cause VM threads
3267 // to get unfair treatment against other Solaris processes
3268 // which do not explicitly alter their thread priorities.
3269
3270 int os::java_to_os_priority[CriticalPriority + 1] = {
3271 -99999, // 0 Entry should never be used
3272
3273 0, // 1 MinPriority
3274 32, // 2
3275 64, // 3
3276
3277 96, // 4
3278 127, // 5 NormPriority
3279 127, // 6
3280
3281 127, // 7
3282 127, // 8
3283 127, // 9 NearMaxPriority
3284
3285 127, // 10 MaxPriority
3286
3287 -criticalPrio // 11 CriticalPriority
3288 };
3289
3290 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3291 OSThread* osthread = thread->osthread();
3292
3293 // Save requested priority in case the thread hasn't been started
3294 osthread->set_native_priority(newpri);
3295
3296 // Check for critical priority request
3297 bool fxcritical = false;
3298 if (newpri == -criticalPrio) {
3299 fxcritical = true;
3300 newpri = criticalPrio;
3301 }
3302
3303 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3304 if (!UseThreadPriorities) return OS_OK;
3305
3306 int status = 0;
3307
3308 if (!fxcritical) {
3309 // Use thr_setprio only if we have a priority that thr_setprio understands
3310 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3311 }
3312
3313 int lwp_status =
3314 set_lwp_class_and_priority(osthread->thread_id(),
3315 osthread->lwp_id(),
3316 newpri,
3317 fxcritical ? fxLimits.schedPolicy : myClass,
3318 !fxcritical);
3319 if (lwp_status != 0 && fxcritical) {
3320 // Try again, this time without changing the scheduling class
3321 newpri = java_MaxPriority_to_os_priority;
3322 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3323 osthread->lwp_id(),
3324 newpri, myClass, false);
3325 }
3326 status |= lwp_status;
3327 return (status == 0) ? OS_OK : OS_ERR;
3328 }
3329
3330
3331 OSReturn os::get_native_priority(const Thread* const thread,
3332 int *priority_ptr) {
3333 int p;
3334 if (!UseThreadPriorities) {
3335 *priority_ptr = NormalPriority;
3336 return OS_OK;
3337 }
3338 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3339 if (status != 0) {
3340 return OS_ERR;
3341 }
3342 *priority_ptr = p;
3343 return OS_OK;
3344 }
3345
3346 ////////////////////////////////////////////////////////////////////////////////
3347 // suspend/resume support
3348
3349 // The low-level signal-based suspend/resume support is a remnant from the
3350 // old VM-suspension that used to be for java-suspension, safepoints etc,
3351 // within hotspot. Currently used by JFR's OSThreadSampler
3352 //
3353 // The remaining code is greatly simplified from the more general suspension
3354 // code that used to be used.
3355 //
3356 // The protocol is quite simple:
3357 // - suspend:
3358 // - sends a signal to the target thread
3359 // - polls the suspend state of the osthread using a yield loop
3360 // - target thread signal handler (SR_handler) sets suspend state
3361 // and blocks in sigsuspend until continued
3362 // - resume:
3363 // - sets target osthread state to continue
3364 // - sends signal to end the sigsuspend loop in the SR_handler
3365 //
3366 // Note that the SR_lock plays no role in this suspend/resume protocol,
3367 // but is checked for NULL in SR_handler as a thread termination indicator.
3368 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3369 //
3370 // Note that resume_clear_context() and suspend_save_context() are needed
3371 // by SR_handler(), so that fetch_frame_from_ucontext() works,
3372 // which in part is used by:
3373 // - Forte Analyzer: AsyncGetCallTrace()
3374 // - StackBanging: get_frame_at_stack_banging_point()
3375 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3376
3377 static void resume_clear_context(OSThread *osthread) {
3378 osthread->set_ucontext(NULL);
3379 }
3380
3381 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3382 osthread->set_ucontext(context);
3383 }
3384
3385 static PosixSemaphore sr_semaphore;
3386
3387 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3388 // Save and restore errno to avoid confusing native code with EINTR
3389 // after sigsuspend.
3390 int old_errno = errno;
3391
3392 OSThread* osthread = thread->osthread();
3393 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3394
3395 os::SuspendResume::State current = osthread->sr.state();
3396 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3397 suspend_save_context(osthread, context);
3398
3399 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3400 os::SuspendResume::State state = osthread->sr.suspended();
3401 if (state == os::SuspendResume::SR_SUSPENDED) {
3402 sigset_t suspend_set; // signals for sigsuspend()
3403
3404 // get current set of blocked signals and unblock resume signal
3405 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3406 sigdelset(&suspend_set, ASYNC_SIGNAL);
3407
3408 sr_semaphore.signal();
3409 // wait here until we are resumed
3410 while (1) {
3411 sigsuspend(&suspend_set);
3412
3413 os::SuspendResume::State result = osthread->sr.running();
3414 if (result == os::SuspendResume::SR_RUNNING) {
3415 sr_semaphore.signal();
3416 break;
3417 }
3418 }
3419
3420 } else if (state == os::SuspendResume::SR_RUNNING) {
3421 // request was cancelled, continue
3422 } else {
3423 ShouldNotReachHere();
3424 }
3425
3426 resume_clear_context(osthread);
3427 } else if (current == os::SuspendResume::SR_RUNNING) {
3428 // request was cancelled, continue
3429 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3430 // ignore
3431 } else {
3432 // ignore
3433 }
3434
3435 errno = old_errno;
3436 }
3437
3438 void os::print_statistics() {
3439 }
3440
3441 bool os::message_box(const char* title, const char* message) {
3442 int i;
3443 fdStream err(defaultStream::error_fd());
3444 for (i = 0; i < 78; i++) err.print_raw("=");
3445 err.cr();
3446 err.print_raw_cr(title);
3447 for (i = 0; i < 78; i++) err.print_raw("-");
3448 err.cr();
3449 err.print_raw_cr(message);
3450 for (i = 0; i < 78; i++) err.print_raw("=");
3451 err.cr();
3452
3453 char buf[16];
3454 // Prevent process from exiting upon "read error" without consuming all CPU
3455 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3456
3457 return buf[0] == 'y' || buf[0] == 'Y';
3458 }
3459
3460 static int sr_notify(OSThread* osthread) {
3461 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3462 assert_status(status == 0, status, "thr_kill");
3463 return status;
3464 }
3465
3466 // "Randomly" selected value for how long we want to spin
3467 // before bailing out on suspending a thread, also how often
3468 // we send a signal to a thread we want to resume
3469 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3470 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3471
3472 static bool do_suspend(OSThread* osthread) {
3473 assert(osthread->sr.is_running(), "thread should be running");
3474 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3475
3476 // mark as suspended and send signal
3477 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3478 // failed to switch, state wasn't running?
3479 ShouldNotReachHere();
3480 return false;
3481 }
3482
3483 if (sr_notify(osthread) != 0) {
3484 ShouldNotReachHere();
3485 }
3486
3487 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3488 while (true) {
3489 if (sr_semaphore.timedwait(2000)) {
3490 break;
3491 } else {
3492 // timeout
3493 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3494 if (cancelled == os::SuspendResume::SR_RUNNING) {
3495 return false;
3496 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3497 // make sure that we consume the signal on the semaphore as well
3498 sr_semaphore.wait();
3499 break;
3500 } else {
3501 ShouldNotReachHere();
3502 return false;
3503 }
3504 }
3505 }
3506
3507 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3508 return true;
3509 }
3510
3511 static void do_resume(OSThread* osthread) {
3512 assert(osthread->sr.is_suspended(), "thread should be suspended");
3513 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3514
3515 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3516 // failed to switch to WAKEUP_REQUEST
3517 ShouldNotReachHere();
3518 return;
3519 }
3520
3521 while (true) {
3522 if (sr_notify(osthread) == 0) {
3523 if (sr_semaphore.timedwait(2)) {
3524 if (osthread->sr.is_running()) {
3525 return;
3526 }
3527 }
3528 } else {
3529 ShouldNotReachHere();
3530 }
3531 }
3532
3533 guarantee(osthread->sr.is_running(), "Must be running!");
3534 }
3535
3536 void os::SuspendedThreadTask::internal_do_task() {
3537 if (do_suspend(_thread->osthread())) {
3538 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3539 do_task(context);
3540 do_resume(_thread->osthread());
3541 }
3542 }
3543
3544 // This does not do anything on Solaris. This is basically a hook for being
3545 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3546 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3547 const methodHandle& method, JavaCallArguments* args,
3548 Thread* thread) {
3549 f(value, method, args, thread);
3550 }
3551
3552 // This routine may be used by user applications as a "hook" to catch signals.
3553 // The user-defined signal handler must pass unrecognized signals to this
3554 // routine, and if it returns true (non-zero), then the signal handler must
3555 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3556 // routine will never retun false (zero), but instead will execute a VM panic
3557 // routine kill the process.
3558 //
3559 // If this routine returns false, it is OK to call it again. This allows
3560 // the user-defined signal handler to perform checks either before or after
3561 // the VM performs its own checks. Naturally, the user code would be making
3562 // a serious error if it tried to handle an exception (such as a null check
3563 // or breakpoint) that the VM was generating for its own correct operation.
3564 //
3565 // This routine may recognize any of the following kinds of signals:
3566 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3567 // ASYNC_SIGNAL.
3568 // It should be consulted by handlers for any of those signals.
3569 //
3570 // The caller of this routine must pass in the three arguments supplied
3571 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3572 // field of the structure passed to sigaction(). This routine assumes that
3573 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3574 //
3575 // Note that the VM will print warnings if it detects conflicting signal
3576 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3577 //
3578 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3579 siginfo_t* siginfo,
3580 void* ucontext,
3581 int abort_if_unrecognized);
3582
3583
3584 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3585 int orig_errno = errno; // Preserve errno value over signal handler.
3586 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3587 errno = orig_errno;
3588 }
3589
3590 // This boolean allows users to forward their own non-matching signals
3591 // to JVM_handle_solaris_signal, harmlessly.
3592 bool os::Solaris::signal_handlers_are_installed = false;
3593
3594 // For signal-chaining
3595 bool os::Solaris::libjsig_is_loaded = false;
3596 typedef struct sigaction *(*get_signal_t)(int);
3597 get_signal_t os::Solaris::get_signal_action = NULL;
3598
3599 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3600 struct sigaction *actp = NULL;
3601
3602 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3603 // Retrieve the old signal handler from libjsig
3604 actp = (*get_signal_action)(sig);
3605 }
3606 if (actp == NULL) {
3607 // Retrieve the preinstalled signal handler from jvm
3608 actp = get_preinstalled_handler(sig);
3609 }
3610
3611 return actp;
3612 }
3613
3614 static bool call_chained_handler(struct sigaction *actp, int sig,
3615 siginfo_t *siginfo, void *context) {
3616 // Call the old signal handler
3617 if (actp->sa_handler == SIG_DFL) {
3618 // It's more reasonable to let jvm treat it as an unexpected exception
3619 // instead of taking the default action.
3620 return false;
3621 } else if (actp->sa_handler != SIG_IGN) {
3622 if ((actp->sa_flags & SA_NODEFER) == 0) {
3623 // automaticlly block the signal
3624 sigaddset(&(actp->sa_mask), sig);
3625 }
3626
3627 sa_handler_t hand;
3628 sa_sigaction_t sa;
3629 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3630 // retrieve the chained handler
3631 if (siginfo_flag_set) {
3632 sa = actp->sa_sigaction;
3633 } else {
3634 hand = actp->sa_handler;
3635 }
3636
3637 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3638 actp->sa_handler = SIG_DFL;
3639 }
3640
3641 // try to honor the signal mask
3642 sigset_t oset;
3643 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3644
3645 // call into the chained handler
3646 if (siginfo_flag_set) {
3647 (*sa)(sig, siginfo, context);
3648 } else {
3649 (*hand)(sig);
3650 }
3651
3652 // restore the signal mask
3653 pthread_sigmask(SIG_SETMASK, &oset, 0);
3654 }
3655 // Tell jvm's signal handler the signal is taken care of.
3656 return true;
3657 }
3658
3659 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3660 bool chained = false;
3661 // signal-chaining
3662 if (UseSignalChaining) {
3663 struct sigaction *actp = get_chained_signal_action(sig);
3664 if (actp != NULL) {
3665 chained = call_chained_handler(actp, sig, siginfo, context);
3666 }
3667 }
3668 return chained;
3669 }
3670
3671 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3672 assert((chainedsigactions != (struct sigaction *)NULL) &&
3673 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3674 if (preinstalled_sigs[sig] != 0) {
3675 return &chainedsigactions[sig];
3676 }
3677 return NULL;
3678 }
3679
3680 void os::Solaris::save_preinstalled_handler(int sig,
3681 struct sigaction& oldAct) {
3682 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3683 assert((chainedsigactions != (struct sigaction *)NULL) &&
3684 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3685 chainedsigactions[sig] = oldAct;
3686 preinstalled_sigs[sig] = 1;
3687 }
3688
3689 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3690 bool oktochain) {
3691 // Check for overwrite.
3692 struct sigaction oldAct;
3693 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3694 void* oldhand =
3695 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3696 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3697 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3698 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3699 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3700 if (AllowUserSignalHandlers || !set_installed) {
3701 // Do not overwrite; user takes responsibility to forward to us.
3702 return;
3703 } else if (UseSignalChaining) {
3704 if (oktochain) {
3705 // save the old handler in jvm
3706 save_preinstalled_handler(sig, oldAct);
3707 } else {
3708 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3709 }
3710 // libjsig also interposes the sigaction() call below and saves the
3711 // old sigaction on it own.
3712 } else {
3713 fatal("Encountered unexpected pre-existing sigaction handler "
3714 "%#lx for signal %d.", (long)oldhand, sig);
3715 }
3716 }
3717
3718 struct sigaction sigAct;
3719 sigfillset(&(sigAct.sa_mask));
3720 sigAct.sa_handler = SIG_DFL;
3721
3722 sigAct.sa_sigaction = signalHandler;
3723 // Handle SIGSEGV on alternate signal stack if
3724 // not using stack banging
3725 if (!UseStackBanging && sig == SIGSEGV) {
3726 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3727 } else {
3728 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3729 }
3730 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3731
3732 sigaction(sig, &sigAct, &oldAct);
3733
3734 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3735 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3736 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3737 }
3738
3739
3740 #define DO_SIGNAL_CHECK(sig) \
3741 do { \
3742 if (!sigismember(&check_signal_done, sig)) { \
3743 os::Solaris::check_signal_handler(sig); \
3744 } \
3745 } while (0)
3746
3747 // This method is a periodic task to check for misbehaving JNI applications
3748 // under CheckJNI, we can add any periodic checks here
3749
3750 void os::run_periodic_checks() {
3751 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3752 // thereby preventing a NULL checks.
3753 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3754
3755 if (check_signals == false) return;
3756
3757 // SEGV and BUS if overridden could potentially prevent
3758 // generation of hs*.log in the event of a crash, debugging
3759 // such a case can be very challenging, so we absolutely
3760 // check for the following for a good measure:
3761 DO_SIGNAL_CHECK(SIGSEGV);
3762 DO_SIGNAL_CHECK(SIGILL);
3763 DO_SIGNAL_CHECK(SIGFPE);
3764 DO_SIGNAL_CHECK(SIGBUS);
3765 DO_SIGNAL_CHECK(SIGPIPE);
3766 DO_SIGNAL_CHECK(SIGXFSZ);
3767 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3768
3769 // ReduceSignalUsage allows the user to override these handlers
3770 // see comments at the very top and jvm_solaris.h
3771 if (!ReduceSignalUsage) {
3772 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3773 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3774 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3775 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3776 }
3777 }
3778
3779 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3780
3781 static os_sigaction_t os_sigaction = NULL;
3782
3783 void os::Solaris::check_signal_handler(int sig) {
3784 char buf[O_BUFLEN];
3785 address jvmHandler = NULL;
3786
3787 struct sigaction act;
3788 if (os_sigaction == NULL) {
3789 // only trust the default sigaction, in case it has been interposed
3790 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3791 if (os_sigaction == NULL) return;
3792 }
3793
3794 os_sigaction(sig, (struct sigaction*)NULL, &act);
3795
3796 address thisHandler = (act.sa_flags & SA_SIGINFO)
3797 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3798 : CAST_FROM_FN_PTR(address, act.sa_handler);
3799
3800
3801 switch (sig) {
3802 case SIGSEGV:
3803 case SIGBUS:
3804 case SIGFPE:
3805 case SIGPIPE:
3806 case SIGXFSZ:
3807 case SIGILL:
3808 case ASYNC_SIGNAL:
3809 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3810 break;
3811
3812 case SHUTDOWN1_SIGNAL:
3813 case SHUTDOWN2_SIGNAL:
3814 case SHUTDOWN3_SIGNAL:
3815 case BREAK_SIGNAL:
3816 jvmHandler = (address)user_handler();
3817 break;
3818
3819 default:
3820 return;
3821 }
3822
3823 if (thisHandler != jvmHandler) {
3824 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3825 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3826 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3827 // No need to check this sig any longer
3828 sigaddset(&check_signal_done, sig);
3829 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3830 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3831 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3832 exception_name(sig, buf, O_BUFLEN));
3833 }
3834 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3835 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3836 tty->print("expected:");
3837 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3838 tty->cr();
3839 tty->print(" found:");
3840 os::Posix::print_sa_flags(tty, act.sa_flags);
3841 tty->cr();
3842 // No need to check this sig any longer
3843 sigaddset(&check_signal_done, sig);
3844 }
3845
3846 // Print all the signal handler state
3847 if (sigismember(&check_signal_done, sig)) {
3848 print_signal_handlers(tty, buf, O_BUFLEN);
3849 }
3850
3851 }
3852
3853 void os::Solaris::install_signal_handlers() {
3854 signal_handlers_are_installed = true;
3855
3856 // signal-chaining
3857 typedef void (*signal_setting_t)();
3858 signal_setting_t begin_signal_setting = NULL;
3859 signal_setting_t end_signal_setting = NULL;
3860 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3861 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3862 if (begin_signal_setting != NULL) {
3863 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3864 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3865 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3866 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3867 libjsig_is_loaded = true;
3868 assert(UseSignalChaining, "should enable signal-chaining");
3869 }
3870 if (libjsig_is_loaded) {
3871 // Tell libjsig jvm is setting signal handlers
3872 (*begin_signal_setting)();
3873 }
3874
3875 set_signal_handler(SIGSEGV, true, true);
3876 set_signal_handler(SIGPIPE, true, true);
3877 set_signal_handler(SIGXFSZ, true, true);
3878 set_signal_handler(SIGBUS, true, true);
3879 set_signal_handler(SIGILL, true, true);
3880 set_signal_handler(SIGFPE, true, true);
3881 set_signal_handler(ASYNC_SIGNAL, true, true);
3882
3883 if (libjsig_is_loaded) {
3884 // Tell libjsig jvm finishes setting signal handlers
3885 (*end_signal_setting)();
3886 }
3887
3888 // We don't activate signal checker if libjsig is in place, we trust ourselves
3889 // and if UserSignalHandler is installed all bets are off.
3890 // Log that signal checking is off only if -verbose:jni is specified.
3891 if (CheckJNICalls) {
3892 if (libjsig_is_loaded) {
3893 if (PrintJNIResolving) {
3894 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3895 }
3896 check_signals = false;
3897 }
3898 if (AllowUserSignalHandlers) {
3899 if (PrintJNIResolving) {
3900 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3901 }
3902 check_signals = false;
3903 }
3904 }
3905 }
3906
3907
3908 void report_error(const char* file_name, int line_no, const char* title,
3909 const char* format, ...);
3910
3911 // (Static) wrappers for the liblgrp API
3912 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
3913 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
3914 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
3915 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
3916 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
3917 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
3918 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
3919 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
3920 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
3921
3922 static address resolve_symbol_lazy(const char* name) {
3923 address addr = (address) dlsym(RTLD_DEFAULT, name);
3924 if (addr == NULL) {
3925 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
3926 addr = (address) dlsym(RTLD_NEXT, name);
3927 }
3928 return addr;
3929 }
3930
3931 static address resolve_symbol(const char* name) {
3932 address addr = resolve_symbol_lazy(name);
3933 if (addr == NULL) {
3934 fatal(dlerror());
3935 }
3936 return addr;
3937 }
3938
3939 void os::Solaris::libthread_init() {
3940 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
3941
3942 lwp_priocntl_init();
3943
3944 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
3945 if (func == NULL) {
3946 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
3947 // Guarantee that this VM is running on an new enough OS (5.6 or
3948 // later) that it will have a new enough libthread.so.
3949 guarantee(func != NULL, "libthread.so is too old.");
3950 }
3951
3952 int size;
3953 void (*handler_info_func)(address *, int *);
3954 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
3955 handler_info_func(&handler_start, &size);
3956 handler_end = handler_start + size;
3957 }
3958
3959
3960 int_fnP_mutex_tP os::Solaris::_mutex_lock;
3961 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
3962 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
3963 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
3964 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
3965 int os::Solaris::_mutex_scope = USYNC_THREAD;
3966
3967 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
3968 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
3969 int_fnP_cond_tP os::Solaris::_cond_signal;
3970 int_fnP_cond_tP os::Solaris::_cond_broadcast;
3971 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
3972 int_fnP_cond_tP os::Solaris::_cond_destroy;
3973 int os::Solaris::_cond_scope = USYNC_THREAD;
3974 bool os::Solaris::_synchronization_initialized;
3975
3976 void os::Solaris::synchronization_init() {
3977 if (UseLWPSynchronization) {
3978 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
3979 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
3980 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
3981 os::Solaris::set_mutex_init(lwp_mutex_init);
3982 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
3983 os::Solaris::set_mutex_scope(USYNC_THREAD);
3984
3985 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
3986 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
3987 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
3988 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
3989 os::Solaris::set_cond_init(lwp_cond_init);
3990 os::Solaris::set_cond_destroy(lwp_cond_destroy);
3991 os::Solaris::set_cond_scope(USYNC_THREAD);
3992 } else {
3993 os::Solaris::set_mutex_scope(USYNC_THREAD);
3994 os::Solaris::set_cond_scope(USYNC_THREAD);
3995
3996 if (UsePthreads) {
3997 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
3998 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
3999 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4000 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4001 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4002
4003 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4004 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4005 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4006 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4007 os::Solaris::set_cond_init(pthread_cond_default_init);
4008 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4009 } else {
4010 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4011 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4012 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4013 os::Solaris::set_mutex_init(::mutex_init);
4014 os::Solaris::set_mutex_destroy(::mutex_destroy);
4015
4016 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4017 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4018 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4019 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4020 os::Solaris::set_cond_init(::cond_init);
4021 os::Solaris::set_cond_destroy(::cond_destroy);
4022 }
4023 }
4024 _synchronization_initialized = true;
4025 }
4026
4027 bool os::Solaris::liblgrp_init() {
4028 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4029 if (handle != NULL) {
4030 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4031 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4032 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4033 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4034 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4035 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4036 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4037 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4038 dlsym(handle, "lgrp_cookie_stale")));
4039
4040 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4041 set_lgrp_cookie(c);
4042 return true;
4043 }
4044 return false;
4045 }
4046
4047 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4048 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4049 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4050
4051 void init_pset_getloadavg_ptr(void) {
4052 pset_getloadavg_ptr =
4053 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4054 if (pset_getloadavg_ptr == NULL) {
4055 log_warning(os)("pset_getloadavg function not found");
4056 }
4057 }
4058
4059 int os::Solaris::_dev_zero_fd = -1;
4060
4061 // this is called _before_ the global arguments have been parsed
4062 void os::init(void) {
4063 _initial_pid = getpid();
4064
4065 max_hrtime = first_hrtime = gethrtime();
4066
4067 init_random(1234567);
4068
4069 page_size = sysconf(_SC_PAGESIZE);
4070 if (page_size == -1) {
4071 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4072 }
4073 init_page_sizes((size_t) page_size);
4074
4075 Solaris::initialize_system_info();
4076
4077 int fd = ::open("/dev/zero", O_RDWR);
4078 if (fd < 0) {
4079 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4080 } else {
4081 Solaris::set_dev_zero_fd(fd);
4082
4083 // Close on exec, child won't inherit.
4084 fcntl(fd, F_SETFD, FD_CLOEXEC);
4085 }
4086
4087 clock_tics_per_sec = CLK_TCK;
4088
4089 // check if dladdr1() exists; dladdr1 can provide more information than
4090 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4091 // and is available on linker patches for 5.7 and 5.8.
4092 // libdl.so must have been loaded, this call is just an entry lookup
4093 void * hdl = dlopen("libdl.so", RTLD_NOW);
4094 if (hdl) {
4095 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4096 }
4097
4098 // main_thread points to the thread that created/loaded the JVM.
4099 main_thread = thr_self();
4100
4101 // dynamic lookup of functions that may not be available in our lowest
4102 // supported Solaris release
4103 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4104 if (handle != NULL) {
4105 Solaris::_pthread_setname_np = // from 11.3
4106 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4107 }
4108
4109 // Shared Posix initialization
4110 os::Posix::init();
4111 }
4112
4113 // To install functions for atexit system call
4114 extern "C" {
4115 static void perfMemory_exit_helper() {
4116 perfMemory_exit();
4117 }
4118 }
4119
4120 // this is called _after_ the global arguments have been parsed
4121 jint os::init_2(void) {
4122 // try to enable extended file IO ASAP, see 6431278
4123 os::Solaris::try_enable_extended_io();
4124
4125 // Check and sets minimum stack sizes against command line options
4126 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4127 return JNI_ERR;
4128 }
4129
4130 Solaris::libthread_init();
4131
4132 if (UseNUMA) {
4133 if (!Solaris::liblgrp_init()) {
4134 UseNUMA = false;
4135 } else {
4136 size_t lgrp_limit = os::numa_get_groups_num();
4137 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4138 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4139 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4140 if (lgrp_num < 2) {
4141 // There's only one locality group, disable NUMA.
4142 UseNUMA = false;
4143 }
4144 }
4145 if (!UseNUMA && ForceNUMA) {
4146 UseNUMA = true;
4147 }
4148 }
4149
4150 Solaris::signal_sets_init();
4151 Solaris::init_signal_mem();
4152 Solaris::install_signal_handlers();
4153 // Initialize data for jdk.internal.misc.Signal
4154 if (!ReduceSignalUsage) {
4155 jdk_misc_signal_init();
4156 }
4157
4158 // initialize synchronization primitives to use either thread or
4159 // lwp synchronization (controlled by UseLWPSynchronization)
4160 Solaris::synchronization_init();
4161 DEBUG_ONLY(os::set_mutex_init_done();)
4162
4163 if (MaxFDLimit) {
4164 // set the number of file descriptors to max. print out error
4165 // if getrlimit/setrlimit fails but continue regardless.
4166 struct rlimit nbr_files;
4167 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4168 if (status != 0) {
4169 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4170 } else {
4171 nbr_files.rlim_cur = nbr_files.rlim_max;
4172 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4173 if (status != 0) {
4174 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4175 }
4176 }
4177 }
4178
4179 // Calculate theoretical max. size of Threads to guard gainst
4180 // artifical out-of-memory situations, where all available address-
4181 // space has been reserved by thread stacks. Default stack size is 1Mb.
4182 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4183 JavaThread::stack_size_at_create() : (1*K*K);
4184 assert(pre_thread_stack_size != 0, "Must have a stack");
4185 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4186 // we should start doing Virtual Memory banging. Currently when the threads will
4187 // have used all but 200Mb of space.
4188 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4189 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4190
4191 // at-exit methods are called in the reverse order of their registration.
4192 // In Solaris 7 and earlier, atexit functions are called on return from
4193 // main or as a result of a call to exit(3C). There can be only 32 of
4194 // these functions registered and atexit() does not set errno. In Solaris
4195 // 8 and later, there is no limit to the number of functions registered
4196 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4197 // functions are called upon dlclose(3DL) in addition to return from main
4198 // and exit(3C).
4199
4200 if (PerfAllowAtExitRegistration) {
4201 // only register atexit functions if PerfAllowAtExitRegistration is set.
4202 // atexit functions can be delayed until process exit time, which
4203 // can be problematic for embedded VM situations. Embedded VMs should
4204 // call DestroyJavaVM() to assure that VM resources are released.
4205
4206 // note: perfMemory_exit_helper atexit function may be removed in
4207 // the future if the appropriate cleanup code can be added to the
4208 // VM_Exit VMOperation's doit method.
4209 if (atexit(perfMemory_exit_helper) != 0) {
4210 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4211 }
4212 }
4213
4214 // Init pset_loadavg function pointer
4215 init_pset_getloadavg_ptr();
4216
4217 // Shared Posix initialization
4218 os::Posix::init_2();
4219
4220 return JNI_OK;
4221 }
4222
4223 // Mark the polling page as unreadable
4224 void os::make_polling_page_unreadable(void) {
4225 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4226 fatal("Could not disable polling page");
4227 }
4228 }
4229
4230 // Mark the polling page as readable
4231 void os::make_polling_page_readable(void) {
4232 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4233 fatal("Could not enable polling page");
4234 }
4235 }
4236
4237 // Is a (classpath) directory empty?
4238 bool os::dir_is_empty(const char* path) {
4239 DIR *dir = NULL;
4240 struct dirent *ptr;
4241
4242 dir = opendir(path);
4243 if (dir == NULL) return true;
4244
4245 // Scan the directory
4246 bool result = true;
4247 while (result && (ptr = readdir(dir)) != NULL) {
4248 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4249 result = false;
4250 }
4251 }
4252 closedir(dir);
4253 return result;
4254 }
4255
4256 // This code originates from JDK's sysOpen and open64_w
4257 // from src/solaris/hpi/src/system_md.c
4258
4259 int os::open(const char *path, int oflag, int mode) {
4260 if (strlen(path) > MAX_PATH - 1) {
4261 errno = ENAMETOOLONG;
4262 return -1;
4263 }
4264 int fd;
4265
4266 fd = ::open64(path, oflag, mode);
4267 if (fd == -1) return -1;
4268
4269 // If the open succeeded, the file might still be a directory
4270 {
4271 struct stat64 buf64;
4272 int ret = ::fstat64(fd, &buf64);
4273 int st_mode = buf64.st_mode;
4274
4275 if (ret != -1) {
4276 if ((st_mode & S_IFMT) == S_IFDIR) {
4277 errno = EISDIR;
4278 ::close(fd);
4279 return -1;
4280 }
4281 } else {
4282 ::close(fd);
4283 return -1;
4284 }
4285 }
4286
4287 // 32-bit Solaris systems suffer from:
4288 //
4289 // - an historical default soft limit of 256 per-process file
4290 // descriptors that is too low for many Java programs.
4291 //
4292 // - a design flaw where file descriptors created using stdio
4293 // fopen must be less than 256, _even_ when the first limit above
4294 // has been raised. This can cause calls to fopen (but not calls to
4295 // open, for example) to fail mysteriously, perhaps in 3rd party
4296 // native code (although the JDK itself uses fopen). One can hardly
4297 // criticize them for using this most standard of all functions.
4298 //
4299 // We attempt to make everything work anyways by:
4300 //
4301 // - raising the soft limit on per-process file descriptors beyond
4302 // 256
4303 //
4304 // - As of Solaris 10u4, we can request that Solaris raise the 256
4305 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4306 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4307 //
4308 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4309 // workaround the bug by remapping non-stdio file descriptors below
4310 // 256 to ones beyond 256, which is done below.
4311 //
4312 // See:
4313 // 1085341: 32-bit stdio routines should support file descriptors >255
4314 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4315 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4316 // enable_extended_FILE_stdio() in VM initialisation
4317 // Giri Mandalika's blog
4318 // http://technopark02.blogspot.com/2005_05_01_archive.html
4319 //
4320 #ifndef _LP64
4321 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4322 int newfd = ::fcntl(fd, F_DUPFD, 256);
4323 if (newfd != -1) {
4324 ::close(fd);
4325 fd = newfd;
4326 }
4327 }
4328 #endif // 32-bit Solaris
4329
4330 // All file descriptors that are opened in the JVM and not
4331 // specifically destined for a subprocess should have the
4332 // close-on-exec flag set. If we don't set it, then careless 3rd
4333 // party native code might fork and exec without closing all
4334 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4335 // UNIXProcess.c), and this in turn might:
4336 //
4337 // - cause end-of-file to fail to be detected on some file
4338 // descriptors, resulting in mysterious hangs, or
4339 //
4340 // - might cause an fopen in the subprocess to fail on a system
4341 // suffering from bug 1085341.
4342 //
4343 // (Yes, the default setting of the close-on-exec flag is a Unix
4344 // design flaw)
4345 //
4346 // See:
4347 // 1085341: 32-bit stdio routines should support file descriptors >255
4348 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4349 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4350 //
4351 #ifdef FD_CLOEXEC
4352 {
4353 int flags = ::fcntl(fd, F_GETFD);
4354 if (flags != -1) {
4355 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4356 }
4357 }
4358 #endif
4359
4360 return fd;
4361 }
4362
4363 // create binary file, rewriting existing file if required
4364 int os::create_binary_file(const char* path, bool rewrite_existing) {
4365 int oflags = O_WRONLY | O_CREAT;
4366 if (!rewrite_existing) {
4367 oflags |= O_EXCL;
4368 }
4369 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4370 }
4371
4372 // return current position of file pointer
4373 jlong os::current_file_offset(int fd) {
4374 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4375 }
4376
4377 // move file pointer to the specified offset
4378 jlong os::seek_to_file_offset(int fd, jlong offset) {
4379 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4380 }
4381
4382 jlong os::lseek(int fd, jlong offset, int whence) {
4383 return (jlong) ::lseek64(fd, offset, whence);
4384 }
4385
4386 int os::ftruncate(int fd, jlong length) {
4387 return ::ftruncate64(fd, length);
4388 }
4389
4390 int os::fsync(int fd) {
4391 RESTARTABLE_RETURN_INT(::fsync(fd));
4392 }
4393
4394 int os::available(int fd, jlong *bytes) {
4395 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4396 "Assumed _thread_in_native");
4397 jlong cur, end;
4398 int mode;
4399 struct stat64 buf64;
4400
4401 if (::fstat64(fd, &buf64) >= 0) {
4402 mode = buf64.st_mode;
4403 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4404 int n,ioctl_return;
4405
4406 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4407 if (ioctl_return>= 0) {
4408 *bytes = n;
4409 return 1;
4410 }
4411 }
4412 }
4413 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4414 return 0;
4415 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4416 return 0;
4417 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4418 return 0;
4419 }
4420 *bytes = end - cur;
4421 return 1;
4422 }
4423
4424 // Map a block of memory.
4425 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4426 char *addr, size_t bytes, bool read_only,
4427 bool allow_exec) {
4428 int prot;
4429 int flags;
4430
4431 if (read_only) {
4432 prot = PROT_READ;
4433 flags = MAP_SHARED;
4434 } else {
4435 prot = PROT_READ | PROT_WRITE;
4436 flags = MAP_PRIVATE;
4437 }
4438
4439 if (allow_exec) {
4440 prot |= PROT_EXEC;
4441 }
4442
4443 if (addr != NULL) {
4444 flags |= MAP_FIXED;
4445 }
4446
4447 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4448 fd, file_offset);
4449 if (mapped_address == MAP_FAILED) {
4450 return NULL;
4451 }
4452 return mapped_address;
4453 }
4454
4455
4456 // Remap a block of memory.
4457 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4458 char *addr, size_t bytes, bool read_only,
4459 bool allow_exec) {
4460 // same as map_memory() on this OS
4461 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4462 allow_exec);
4463 }
4464
4465
4466 // Unmap a block of memory.
4467 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4468 return munmap(addr, bytes) == 0;
4469 }
4470
4471 void os::pause() {
4472 char filename[MAX_PATH];
4473 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4474 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4475 } else {
4476 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4477 }
4478
4479 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4480 if (fd != -1) {
4481 struct stat buf;
4482 ::close(fd);
4483 while (::stat(filename, &buf) == 0) {
4484 (void)::poll(NULL, 0, 100);
4485 }
4486 } else {
4487 jio_fprintf(stderr,
4488 "Could not open pause file '%s', continuing immediately.\n", filename);
4489 }
4490 }
4491
4492 #ifndef PRODUCT
4493 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4494 // Turn this on if you need to trace synch operations.
4495 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4496 // and call record_synch_enable and record_synch_disable
4497 // around the computation of interest.
4498
4499 void record_synch(char* name, bool returning); // defined below
4500
4501 class RecordSynch {
4502 char* _name;
4503 public:
4504 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4505 ~RecordSynch() { record_synch(_name, true); }
4506 };
4507
4508 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4509 extern "C" ret name params { \
4510 typedef ret name##_t params; \
4511 static name##_t* implem = NULL; \
4512 static int callcount = 0; \
4513 if (implem == NULL) { \
4514 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4515 if (implem == NULL) fatal(dlerror()); \
4516 } \
4517 ++callcount; \
4518 RecordSynch _rs(#name); \
4519 inner; \
4520 return implem args; \
4521 }
4522 // in dbx, examine callcounts this way:
4523 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4524
4525 #define CHECK_POINTER_OK(p) \
4526 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4527 #define CHECK_MU \
4528 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4529 #define CHECK_CV \
4530 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4531 #define CHECK_P(p) \
4532 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4533
4534 #define CHECK_MUTEX(mutex_op) \
4535 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4536
4537 CHECK_MUTEX( mutex_lock)
4538 CHECK_MUTEX( _mutex_lock)
4539 CHECK_MUTEX( mutex_unlock)
4540 CHECK_MUTEX(_mutex_unlock)
4541 CHECK_MUTEX( mutex_trylock)
4542 CHECK_MUTEX(_mutex_trylock)
4543
4544 #define CHECK_COND(cond_op) \
4545 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4546
4547 CHECK_COND( cond_wait);
4548 CHECK_COND(_cond_wait);
4549 CHECK_COND(_cond_wait_cancel);
4550
4551 #define CHECK_COND2(cond_op) \
4552 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4553
4554 CHECK_COND2( cond_timedwait);
4555 CHECK_COND2(_cond_timedwait);
4556 CHECK_COND2(_cond_timedwait_cancel);
4557
4558 // do the _lwp_* versions too
4559 #define mutex_t lwp_mutex_t
4560 #define cond_t lwp_cond_t
4561 CHECK_MUTEX( _lwp_mutex_lock)
4562 CHECK_MUTEX( _lwp_mutex_unlock)
4563 CHECK_MUTEX( _lwp_mutex_trylock)
4564 CHECK_MUTEX( __lwp_mutex_lock)
4565 CHECK_MUTEX( __lwp_mutex_unlock)
4566 CHECK_MUTEX( __lwp_mutex_trylock)
4567 CHECK_MUTEX(___lwp_mutex_lock)
4568 CHECK_MUTEX(___lwp_mutex_unlock)
4569
4570 CHECK_COND( _lwp_cond_wait);
4571 CHECK_COND( __lwp_cond_wait);
4572 CHECK_COND(___lwp_cond_wait);
4573
4574 CHECK_COND2( _lwp_cond_timedwait);
4575 CHECK_COND2( __lwp_cond_timedwait);
4576 #undef mutex_t
4577 #undef cond_t
4578
4579 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4580 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4581 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4582 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4583 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4584 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4585 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4586 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4587
4588
4589 // recording machinery:
4590
4591 enum { RECORD_SYNCH_LIMIT = 200 };
4592 char* record_synch_name[RECORD_SYNCH_LIMIT];
4593 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4594 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4595 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4596 int record_synch_count = 0;
4597 bool record_synch_enabled = false;
4598
4599 // in dbx, examine recorded data this way:
4600 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4601
4602 void record_synch(char* name, bool returning) {
4603 if (record_synch_enabled) {
4604 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4605 record_synch_name[record_synch_count] = name;
4606 record_synch_returning[record_synch_count] = returning;
4607 record_synch_thread[record_synch_count] = thr_self();
4608 record_synch_arg0ptr[record_synch_count] = &name;
4609 record_synch_count++;
4610 }
4611 // put more checking code here:
4612 // ...
4613 }
4614 }
4615
4616 void record_synch_enable() {
4617 // start collecting trace data, if not already doing so
4618 if (!record_synch_enabled) record_synch_count = 0;
4619 record_synch_enabled = true;
4620 }
4621
4622 void record_synch_disable() {
4623 // stop collecting trace data
4624 record_synch_enabled = false;
4625 }
4626
4627 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4628 #endif // PRODUCT
4629
4630 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4631 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4632 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4633
4634
4635 // JVMTI & JVM monitoring and management support
4636 // The thread_cpu_time() and current_thread_cpu_time() are only
4637 // supported if is_thread_cpu_time_supported() returns true.
4638 // They are not supported on Solaris T1.
4639
4640 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4641 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4642 // of a thread.
4643 //
4644 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4645 // returns the fast estimate available on the platform.
4646
4647 // hrtime_t gethrvtime() return value includes
4648 // user time but does not include system time
4649 jlong os::current_thread_cpu_time() {
4650 return (jlong) gethrvtime();
4651 }
4652
4653 jlong os::thread_cpu_time(Thread *thread) {
4654 // return user level CPU time only to be consistent with
4655 // what current_thread_cpu_time returns.
4656 // thread_cpu_time_info() must be changed if this changes
4657 return os::thread_cpu_time(thread, false /* user time only */);
4658 }
4659
4660 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4661 if (user_sys_cpu_time) {
4662 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4663 } else {
4664 return os::current_thread_cpu_time();
4665 }
4666 }
4667
4668 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4669 char proc_name[64];
4670 int count;
4671 prusage_t prusage;
4672 jlong lwp_time;
4673 int fd;
4674
4675 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4676 getpid(),
4677 thread->osthread()->lwp_id());
4678 fd = ::open(proc_name, O_RDONLY);
4679 if (fd == -1) return -1;
4680
4681 do {
4682 count = ::pread(fd,
4683 (void *)&prusage.pr_utime,
4684 thr_time_size,
4685 thr_time_off);
4686 } while (count < 0 && errno == EINTR);
4687 ::close(fd);
4688 if (count < 0) return -1;
4689
4690 if (user_sys_cpu_time) {
4691 // user + system CPU time
4692 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4693 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4694 (jlong)prusage.pr_stime.tv_nsec +
4695 (jlong)prusage.pr_utime.tv_nsec;
4696 } else {
4697 // user level CPU time only
4698 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4699 (jlong)prusage.pr_utime.tv_nsec;
4700 }
4701
4702 return (lwp_time);
4703 }
4704
4705 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4706 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4707 info_ptr->may_skip_backward = false; // elapsed time not wall time
4708 info_ptr->may_skip_forward = false; // elapsed time not wall time
4709 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4710 }
4711
4712 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4713 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4714 info_ptr->may_skip_backward = false; // elapsed time not wall time
4715 info_ptr->may_skip_forward = false; // elapsed time not wall time
4716 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4717 }
4718
4719 bool os::is_thread_cpu_time_supported() {
4720 return true;
4721 }
4722
4723 // System loadavg support. Returns -1 if load average cannot be obtained.
4724 // Return the load average for our processor set if the primitive exists
4725 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4726 int os::loadavg(double loadavg[], int nelem) {
4727 if (pset_getloadavg_ptr != NULL) {
4728 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4729 } else {
4730 return ::getloadavg(loadavg, nelem);
4731 }
4732 }
4733
4734 //---------------------------------------------------------------------------------
4735
4736 bool os::find(address addr, outputStream* st) {
4737 Dl_info dlinfo;
4738 memset(&dlinfo, 0, sizeof(dlinfo));
4739 if (dladdr(addr, &dlinfo) != 0) {
4740 st->print(PTR_FORMAT ": ", addr);
4741 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4742 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4743 } else if (dlinfo.dli_fbase != NULL) {
4744 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4745 } else {
4746 st->print("<absolute address>");
4747 }
4748 if (dlinfo.dli_fname != NULL) {
4749 st->print(" in %s", dlinfo.dli_fname);
4750 }
4751 if (dlinfo.dli_fbase != NULL) {
4752 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4753 }
4754 st->cr();
4755
4756 if (Verbose) {
4757 // decode some bytes around the PC
4758 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4759 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4760 address lowest = (address) dlinfo.dli_sname;
4761 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4762 if (begin < lowest) begin = lowest;
4763 Dl_info dlinfo2;
4764 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4765 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4766 end = (address) dlinfo2.dli_saddr;
4767 }
4768 Disassembler::decode(begin, end, st);
4769 }
4770 return true;
4771 }
4772 return false;
4773 }
4774
4775 // Following function has been added to support HotSparc's libjvm.so running
4776 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4777 // src/solaris/hpi/native_threads in the EVM codebase.
4778 //
4779 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4780 // libraries and should thus be removed. We will leave it behind for a while
4781 // until we no longer want to able to run on top of 1.3.0 Solaris production
4782 // JDK. See 4341971.
4783
4784 #define STACK_SLACK 0x800
4785
4786 extern "C" {
4787 intptr_t sysThreadAvailableStackWithSlack() {
4788 stack_t st;
4789 intptr_t retval, stack_top;
4790 retval = thr_stksegment(&st);
4791 assert(retval == 0, "incorrect return value from thr_stksegment");
4792 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4793 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4794 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4795 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4796 }
4797 }
4798
4799 // ObjectMonitor park-unpark infrastructure ...
4800 //
4801 // We implement Solaris and Linux PlatformEvents with the
4802 // obvious condvar-mutex-flag triple.
4803 // Another alternative that works quite well is pipes:
4804 // Each PlatformEvent consists of a pipe-pair.
4805 // The thread associated with the PlatformEvent
4806 // calls park(), which reads from the input end of the pipe.
4807 // Unpark() writes into the other end of the pipe.
4808 // The write-side of the pipe must be set NDELAY.
4809 // Unfortunately pipes consume a large # of handles.
4810 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4811 // Using pipes for the 1st few threads might be workable, however.
4812 //
4813 // park() is permitted to return spuriously.
4814 // Callers of park() should wrap the call to park() in
4815 // an appropriate loop. A litmus test for the correct
4816 // usage of park is the following: if park() were modified
4817 // to immediately return 0 your code should still work,
4818 // albeit degenerating to a spin loop.
4819 //
4820 // In a sense, park()-unpark() just provides more polite spinning
4821 // and polling with the key difference over naive spinning being
4822 // that a parked thread needs to be explicitly unparked() in order
4823 // to wake up and to poll the underlying condition.
4824 //
4825 // Assumption:
4826 // Only one parker can exist on an event, which is why we allocate
4827 // them per-thread. Multiple unparkers can coexist.
4828 //
4829 // _Event transitions in park()
4830 // -1 => -1 : illegal
4831 // 1 => 0 : pass - return immediately
4832 // 0 => -1 : block; then set _Event to 0 before returning
4833 //
4834 // _Event transitions in unpark()
4835 // 0 => 1 : just return
4836 // 1 => 1 : just return
4837 // -1 => either 0 or 1; must signal target thread
4838 // That is, we can safely transition _Event from -1 to either
4839 // 0 or 1.
4840 //
4841 // _Event serves as a restricted-range semaphore.
4842 // -1 : thread is blocked, i.e. there is a waiter
4843 // 0 : neutral: thread is running or ready,
4844 // could have been signaled after a wait started
4845 // 1 : signaled - thread is running or ready
4846 //
4847 // Another possible encoding of _Event would be with
4848 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4849 //
4850 // TODO-FIXME: add DTRACE probes for:
4851 // 1. Tx parks
4852 // 2. Ty unparks Tx
4853 // 3. Tx resumes from park
4854
4855
4856 // value determined through experimentation
4857 #define ROUNDINGFIX 11
4858
4859 // utility to compute the abstime argument to timedwait.
4860 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4861
4862 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4863 // millis is the relative timeout time
4864 // abstime will be the absolute timeout time
4865 if (millis < 0) millis = 0;
4866 struct timeval now;
4867 int status = gettimeofday(&now, NULL);
4868 assert(status == 0, "gettimeofday");
4869 jlong seconds = millis / 1000;
4870 jlong max_wait_period;
4871
4872 if (UseLWPSynchronization) {
4873 // forward port of fix for 4275818 (not sleeping long enough)
4874 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
4875 // _lwp_cond_timedwait() used a round_down algorithm rather
4876 // than a round_up. For millis less than our roundfactor
4877 // it rounded down to 0 which doesn't meet the spec.
4878 // For millis > roundfactor we may return a bit sooner, but
4879 // since we can not accurately identify the patch level and
4880 // this has already been fixed in Solaris 9 and 8 we will
4881 // leave it alone rather than always rounding down.
4882
4883 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
4884 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
4885 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
4886 max_wait_period = 21000000;
4887 } else {
4888 max_wait_period = 50000000;
4889 }
4890 millis %= 1000;
4891 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
4892 seconds = max_wait_period;
4893 }
4894 abstime->tv_sec = now.tv_sec + seconds;
4895 long usec = now.tv_usec + millis * 1000;
4896 if (usec >= 1000000) {
4897 abstime->tv_sec += 1;
4898 usec -= 1000000;
4899 }
4900 abstime->tv_nsec = usec * 1000;
4901 return abstime;
4902 }
4903
4904 void os::PlatformEvent::park() { // AKA: down()
4905 // Transitions for _Event:
4906 // -1 => -1 : illegal
4907 // 1 => 0 : pass - return immediately
4908 // 0 => -1 : block; then set _Event to 0 before returning
4909
4910 // Invariant: Only the thread associated with the Event/PlatformEvent
4911 // may call park().
4912 assert(_nParked == 0, "invariant");
4913
4914 int v;
4915 for (;;) {
4916 v = _Event;
4917 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4918 }
4919 guarantee(v >= 0, "invariant");
4920 if (v == 0) {
4921 // Do this the hard way by blocking ...
4922 // See http://monaco.sfbay/detail.jsf?cr=5094058.
4923 int status = os::Solaris::mutex_lock(_mutex);
4924 assert_status(status == 0, status, "mutex_lock");
4925 guarantee(_nParked == 0, "invariant");
4926 ++_nParked;
4927 while (_Event < 0) {
4928 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4929 // Treat this the same as if the wait was interrupted
4930 // With usr/lib/lwp going to kernel, always handle ETIME
4931 status = os::Solaris::cond_wait(_cond, _mutex);
4932 if (status == ETIME) status = EINTR;
4933 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4934 }
4935 --_nParked;
4936 _Event = 0;
4937 status = os::Solaris::mutex_unlock(_mutex);
4938 assert_status(status == 0, status, "mutex_unlock");
4939 // Paranoia to ensure our locked and lock-free paths interact
4940 // correctly with each other.
4941 OrderAccess::fence();
4942 }
4943 }
4944
4945 int os::PlatformEvent::park(jlong millis) {
4946 // Transitions for _Event:
4947 // -1 => -1 : illegal
4948 // 1 => 0 : pass - return immediately
4949 // 0 => -1 : block; then set _Event to 0 before returning
4950
4951 guarantee(_nParked == 0, "invariant");
4952 int v;
4953 for (;;) {
4954 v = _Event;
4955 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4956 }
4957 guarantee(v >= 0, "invariant");
4958 if (v != 0) return OS_OK;
4959
4960 int ret = OS_TIMEOUT;
4961 timestruc_t abst;
4962 compute_abstime(&abst, millis);
4963
4964 // See http://monaco.sfbay/detail.jsf?cr=5094058.
4965 int status = os::Solaris::mutex_lock(_mutex);
4966 assert_status(status == 0, status, "mutex_lock");
4967 guarantee(_nParked == 0, "invariant");
4968 ++_nParked;
4969 while (_Event < 0) {
4970 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
4971 assert_status(status == 0 || status == EINTR ||
4972 status == ETIME || status == ETIMEDOUT,
4973 status, "cond_timedwait");
4974 if (!FilterSpuriousWakeups) break; // previous semantics
4975 if (status == ETIME || status == ETIMEDOUT) break;
4976 // We consume and ignore EINTR and spurious wakeups.
4977 }
4978 --_nParked;
4979 if (_Event >= 0) ret = OS_OK;
4980 _Event = 0;
4981 status = os::Solaris::mutex_unlock(_mutex);
4982 assert_status(status == 0, status, "mutex_unlock");
4983 // Paranoia to ensure our locked and lock-free paths interact
4984 // correctly with each other.
4985 OrderAccess::fence();
4986 return ret;
4987 }
4988
4989 void os::PlatformEvent::unpark() {
4990 // Transitions for _Event:
4991 // 0 => 1 : just return
4992 // 1 => 1 : just return
4993 // -1 => either 0 or 1; must signal target thread
4994 // That is, we can safely transition _Event from -1 to either
4995 // 0 or 1.
4996 // See also: "Semaphores in Plan 9" by Mullender & Cox
4997 //
4998 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4999 // that it will take two back-to-back park() calls for the owning
5000 // thread to block. This has the benefit of forcing a spurious return
5001 // from the first park() call after an unpark() call which will help
5002 // shake out uses of park() and unpark() without condition variables.
5003
5004 if (Atomic::xchg(1, &_Event) >= 0) return;
5005
5006 // If the thread associated with the event was parked, wake it.
5007 // Wait for the thread assoc with the PlatformEvent to vacate.
5008 int status = os::Solaris::mutex_lock(_mutex);
5009 assert_status(status == 0, status, "mutex_lock");
5010 int AnyWaiters = _nParked;
5011 status = os::Solaris::mutex_unlock(_mutex);
5012 assert_status(status == 0, status, "mutex_unlock");
5013 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5014 if (AnyWaiters != 0) {
5015 // Note that we signal() *after* dropping the lock for "immortal" Events.
5016 // This is safe and avoids a common class of futile wakeups. In rare
5017 // circumstances this can cause a thread to return prematurely from
5018 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5019 // will simply re-test the condition and re-park itself.
5020 // This provides particular benefit if the underlying platform does not
5021 // provide wait morphing.
5022 status = os::Solaris::cond_signal(_cond);
5023 assert_status(status == 0, status, "cond_signal");
5024 }
5025 }
5026
5027 // JSR166
5028 // -------------------------------------------------------
5029
5030 // The solaris and linux implementations of park/unpark are fairly
5031 // conservative for now, but can be improved. They currently use a
5032 // mutex/condvar pair, plus _counter.
5033 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5034 // sets count to 1 and signals condvar. Only one thread ever waits
5035 // on the condvar. Contention seen when trying to park implies that someone
5036 // is unparking you, so don't wait. And spurious returns are fine, so there
5037 // is no need to track notifications.
5038
5039 #define MAX_SECS 100000000
5040
5041 // This code is common to linux and solaris and will be moved to a
5042 // common place in dolphin.
5043 //
5044 // The passed in time value is either a relative time in nanoseconds
5045 // or an absolute time in milliseconds. Either way it has to be unpacked
5046 // into suitable seconds and nanoseconds components and stored in the
5047 // given timespec structure.
5048 // Given time is a 64-bit value and the time_t used in the timespec is only
5049 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5050 // overflow if times way in the future are given. Further on Solaris versions
5051 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5052 // number of seconds, in abstime, is less than current_time + 100,000,000.
5053 // As it will be 28 years before "now + 100000000" will overflow we can
5054 // ignore overflow and just impose a hard-limit on seconds using the value
5055 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5056 // years from "now".
5057 //
5058 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5059 assert(time > 0, "convertTime");
5060
5061 struct timeval now;
5062 int status = gettimeofday(&now, NULL);
5063 assert(status == 0, "gettimeofday");
5064
5065 time_t max_secs = now.tv_sec + MAX_SECS;
5066
5067 if (isAbsolute) {
5068 jlong secs = time / 1000;
5069 if (secs > max_secs) {
5070 absTime->tv_sec = max_secs;
5071 } else {
5072 absTime->tv_sec = secs;
5073 }
5074 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5075 } else {
5076 jlong secs = time / NANOSECS_PER_SEC;
5077 if (secs >= MAX_SECS) {
5078 absTime->tv_sec = max_secs;
5079 absTime->tv_nsec = 0;
5080 } else {
5081 absTime->tv_sec = now.tv_sec + secs;
5082 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5083 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5084 absTime->tv_nsec -= NANOSECS_PER_SEC;
5085 ++absTime->tv_sec; // note: this must be <= max_secs
5086 }
5087 }
5088 }
5089 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5090 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5091 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5092 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5093 }
5094
5095 void Parker::park(bool isAbsolute, jlong time) {
5096 // Ideally we'd do something useful while spinning, such
5097 // as calling unpackTime().
5098
5099 // Optional fast-path check:
5100 // Return immediately if a permit is available.
5101 // We depend on Atomic::xchg() having full barrier semantics
5102 // since we are doing a lock-free update to _counter.
5103 if (Atomic::xchg(0, &_counter) > 0) return;
5104
5105 // Optional fast-exit: Check interrupt before trying to wait
5106 Thread* thread = Thread::current();
5107 assert(thread->is_Java_thread(), "Must be JavaThread");
5108 JavaThread *jt = (JavaThread *)thread;
5109 if (Thread::is_interrupted(thread, false)) {
5110 return;
5111 }
5112
5113 // First, demultiplex/decode time arguments
5114 timespec absTime;
5115 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5116 return;
5117 }
5118 if (time > 0) {
5119 // Warning: this code might be exposed to the old Solaris time
5120 // round-down bugs. Grep "roundingFix" for details.
5121 unpackTime(&absTime, isAbsolute, time);
5122 }
5123
5124 // Enter safepoint region
5125 // Beware of deadlocks such as 6317397.
5126 // The per-thread Parker:: _mutex is a classic leaf-lock.
5127 // In particular a thread must never block on the Threads_lock while
5128 // holding the Parker:: mutex. If safepoints are pending both the
5129 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5130 ThreadBlockInVM tbivm(jt);
5131
5132 // Don't wait if cannot get lock since interference arises from
5133 // unblocking. Also. check interrupt before trying wait
5134 if (Thread::is_interrupted(thread, false) ||
5135 os::Solaris::mutex_trylock(_mutex) != 0) {
5136 return;
5137 }
5138
5139 int status;
5140
5141 if (_counter > 0) { // no wait needed
5142 _counter = 0;
5143 status = os::Solaris::mutex_unlock(_mutex);
5144 assert(status == 0, "invariant");
5145 // Paranoia to ensure our locked and lock-free paths interact
5146 // correctly with each other and Java-level accesses.
5147 OrderAccess::fence();
5148 return;
5149 }
5150
5151 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5152 jt->set_suspend_equivalent();
5153 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5154
5155 // Do this the hard way by blocking ...
5156 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5157 if (time == 0) {
5158 status = os::Solaris::cond_wait(_cond, _mutex);
5159 } else {
5160 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5161 }
5162 // Note that an untimed cond_wait() can sometimes return ETIME on older
5163 // versions of the Solaris.
5164 assert_status(status == 0 || status == EINTR ||
5165 status == ETIME || status == ETIMEDOUT,
5166 status, "cond_timedwait");
5167
5168 _counter = 0;
5169 status = os::Solaris::mutex_unlock(_mutex);
5170 assert_status(status == 0, status, "mutex_unlock");
5171 // Paranoia to ensure our locked and lock-free paths interact
5172 // correctly with each other and Java-level accesses.
5173 OrderAccess::fence();
5174
5175 // If externally suspended while waiting, re-suspend
5176 if (jt->handle_special_suspend_equivalent_condition()) {
5177 jt->java_suspend_self();
5178 }
5179 }
5180
5181 void Parker::unpark() {
5182 int status = os::Solaris::mutex_lock(_mutex);
5183 assert(status == 0, "invariant");
5184 const int s = _counter;
5185 _counter = 1;
5186 status = os::Solaris::mutex_unlock(_mutex);
5187 assert(status == 0, "invariant");
5188
5189 if (s < 1) {
5190 status = os::Solaris::cond_signal(_cond);
5191 assert(status == 0, "invariant");
5192 }
5193 }
5194
5195 // Platform Monitor implementation
5196
5197 os::PlatformMonitor::PlatformMonitor() {
5198 int status = os::Solaris::cond_init(&_cond);
5199 assert_status(status == 0, status, "cond_init");
5200 status = os::Solaris::mutex_init(&_mutex);
5201 assert_status(status == 0, status, "mutex_init");
5202 }
5203
5204 os::PlatformMonitor::~PlatformMonitor() {
5205 int status = os::Solaris::cond_destroy(&_cond);
5206 assert_status(status == 0, status, "cond_destroy");
5207 status = os::Solaris::mutex_destroy(&_mutex);
5208 assert_status(status == 0, status, "mutex_destroy");
5209 }
5210
5211 void os::PlatformMonitor::lock() {
5212 int status = os::Solaris::mutex_lock(&_mutex);
5213 assert_status(status == 0, status, "mutex_lock");
5214 }
5215
5216 void os::PlatformMonitor::unlock() {
5217 int status = os::Solaris::mutex_unlock(&_mutex);
5218 assert_status(status == 0, status, "mutex_unlock");
5219 }
5220
5221 bool os::PlatformMonitor::try_lock() {
5222 int status = os::Solaris::mutex_trylock(&_mutex);
5223 assert_status(status == 0 || status == EBUSY, status, "mutex_trylock");
5224 return status == 0;
5225 }
5226
5227 // Must already be locked
5228 int os::PlatformMonitor::wait(jlong millis) {
5229 assert(millis >= 0, "negative timeout");
5230 if (millis > 0) {
5231 timestruc_t abst;
5232 int ret = OS_TIMEOUT;
5233 compute_abstime(&abst, millis);
5234 int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst);
5235 assert_status(status == 0 || status == EINTR ||
5236 status == ETIME || status == ETIMEDOUT,
5237 status, "cond_timedwait");
5238 // EINTR acts as spurious wakeup - which is permitted anyway
5239 if (status == 0 || status == EINTR) {
5240 ret = OS_OK;
5241 }
5242 return ret;
5243 } else {
5244 int status = os::Solaris::cond_wait(&_cond, &_mutex);
5245 assert_status(status == 0 || status == EINTR,
5246 status, "cond_wait");
5247 return OS_OK;
5248 }
5249 }
5250
5251 void os::PlatformMonitor::notify() {
5252 int status = os::Solaris::cond_signal(&_cond);
5253 assert_status(status == 0, status, "cond_signal");
5254 }
5255
5256 void os::PlatformMonitor::notify_all() {
5257 int status = os::Solaris::cond_broadcast(&_cond);
5258 assert_status(status == 0, status, "cond_broadcast");
5259 }
5260
5261 extern char** environ;
5262
5263 // Run the specified command in a separate process. Return its exit value,
5264 // or -1 on failure (e.g. can't fork a new process).
5265 // Unlike system(), this function can be called from signal handler. It
5266 // doesn't block SIGINT et al.
5267 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5268 char * argv[4];
5269 argv[0] = (char *)"sh";
5270 argv[1] = (char *)"-c";
5271 argv[2] = cmd;
5272 argv[3] = NULL;
5273
5274 // fork is async-safe, fork1 is not so can't use in signal handler
5275 pid_t pid;
5276 Thread* t = Thread::current_or_null_safe();
5277 if (t != NULL && t->is_inside_signal_handler()) {
5278 pid = fork();
5279 } else {
5280 pid = fork1();
5281 }
5282
5283 if (pid < 0) {
5284 // fork failed
5285 warning("fork failed: %s", os::strerror(errno));
5286 return -1;
5287
5288 } else if (pid == 0) {
5289 // child process
5290
5291 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5292 execve("/usr/bin/sh", argv, environ);
5293
5294 // execve failed
5295 _exit(-1);
5296
5297 } else {
5298 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5299 // care about the actual exit code, for now.
5300
5301 int status;
5302
5303 // Wait for the child process to exit. This returns immediately if
5304 // the child has already exited. */
5305 while (waitpid(pid, &status, 0) < 0) {
5306 switch (errno) {
5307 case ECHILD: return 0;
5308 case EINTR: break;
5309 default: return -1;
5310 }
5311 }
5312
5313 if (WIFEXITED(status)) {
5314 // The child exited normally; get its exit code.
5315 return WEXITSTATUS(status);
5316 } else if (WIFSIGNALED(status)) {
5317 // The child exited because of a signal
5318 // The best value to return is 0x80 + signal number,
5319 // because that is what all Unix shells do, and because
5320 // it allows callers to distinguish between process exit and
5321 // process death by signal.
5322 return 0x80 + WTERMSIG(status);
5323 } else {
5324 // Unknown exit code; pass it through
5325 return status;
5326 }
5327 }
5328 }
5329
5330 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5331 size_t res;
5332 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5333 return res;
5334 }
5335
5336 int os::close(int fd) {
5337 return ::close(fd);
5338 }
5339
5340 int os::socket_close(int fd) {
5341 return ::close(fd);
5342 }
5343
5344 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5345 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5346 "Assumed _thread_in_native");
5347 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5348 }
5349
5350 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5351 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5352 "Assumed _thread_in_native");
5353 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5354 }
5355
5356 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5357 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5358 }
5359
5360 // As both poll and select can be interrupted by signals, we have to be
5361 // prepared to restart the system call after updating the timeout, unless
5362 // a poll() is done with timeout == -1, in which case we repeat with this
5363 // "wait forever" value.
5364
5365 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5366 int _result;
5367 _result = ::connect(fd, him, len);
5368
5369 // On Solaris, when a connect() call is interrupted, the connection
5370 // can be established asynchronously (see 6343810). Subsequent calls
5371 // to connect() must check the errno value which has the semantic
5372 // described below (copied from the connect() man page). Handling
5373 // of asynchronously established connections is required for both
5374 // blocking and non-blocking sockets.
5375 // EINTR The connection attempt was interrupted
5376 // before any data arrived by the delivery of
5377 // a signal. The connection, however, will be
5378 // established asynchronously.
5379 //
5380 // EINPROGRESS The socket is non-blocking, and the connec-
5381 // tion cannot be completed immediately.
5382 //
5383 // EALREADY The socket is non-blocking, and a previous
5384 // connection attempt has not yet been com-
5385 // pleted.
5386 //
5387 // EISCONN The socket is already connected.
5388 if (_result == OS_ERR && errno == EINTR) {
5389 // restarting a connect() changes its errno semantics
5390 RESTARTABLE(::connect(fd, him, len), _result);
5391 // undo these changes
5392 if (_result == OS_ERR) {
5393 if (errno == EALREADY) {
5394 errno = EINPROGRESS; // fall through
5395 } else if (errno == EISCONN) {
5396 errno = 0;
5397 return OS_OK;
5398 }
5399 }
5400 }
5401 return _result;
5402 }
5403
5404 // Get the default path to the core file
5405 // Returns the length of the string
5406 int os::get_core_path(char* buffer, size_t bufferSize) {
5407 const char* p = get_current_directory(buffer, bufferSize);
5408
5409 if (p == NULL) {
5410 assert(p != NULL, "failed to get current directory");
5411 return 0;
5412 }
5413
5414 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5415 p, current_process_id());
5416
5417 return strlen(buffer);
5418 }
5419
5420 #ifndef PRODUCT
5421 void TestReserveMemorySpecial_test() {
5422 // No tests available for this platform
5423 }
5424 #endif
5425
5426 bool os::start_debugging(char *buf, int buflen) {
5427 int len = (int)strlen(buf);
5428 char *p = &buf[len];
5429
5430 jio_snprintf(p, buflen-len,
5431 "\n\n"
5432 "Do you want to debug the problem?\n\n"
5433 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5434 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5435 "Otherwise, press RETURN to abort...",
5436 os::current_process_id(), os::current_thread_id());
5437
5438 bool yes = os::message_box("Unexpected Error", buf);
5439
5440 if (yes) {
5441 // yes, user asked VM to launch debugger
5442 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5443
5444 os::fork_and_exec(buf);
5445 yes = false;
5446 }
5447 return yes;
5448 }