1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "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.inline.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 <schedctl.h>
82 # include <setjmp.h>
83 # include <signal.h>
84 # include <stdio.h>
85 # include <alloca.h>
86 # include <sys/filio.h>
87 # include <sys/ipc.h>
88 # include <sys/lwp.h>
89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
90 # include <sys/mman.h>
91 # include <sys/processor.h>
92 # include <sys/procset.h>
93 # include <sys/pset.h>
94 # include <sys/resource.h>
95 # include <sys/shm.h>
96 # include <sys/socket.h>
97 # include <sys/stat.h>
98 # include <sys/systeminfo.h>
99 # include <sys/time.h>
100 # include <sys/times.h>
101 # include <sys/types.h>
102 # include <sys/wait.h>
103 # include <sys/utsname.h>
104 # include <thread.h>
105 # include <unistd.h>
106 # include <sys/priocntl.h>
107 # include <sys/rtpriocntl.h>
108 # include <sys/tspriocntl.h>
109 # include <sys/iapriocntl.h>
110 # include <sys/fxpriocntl.h>
111 # include <sys/loadavg.h>
112 # include <string.h>
113 # include <stdio.h>
114
115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
116 # include <sys/procfs.h> // see comment in <sys/procfs.h>
117
118 #define MAX_PATH (2 * K)
119
120 // for timer info max values which include all bits
121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
122
123
124 // Here are some liblgrp types from sys/lgrp_user.h to be able to
125 // compile on older systems without this header file.
126
127 #ifndef MADV_ACCESS_LWP
128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
129 #endif
130 #ifndef MADV_ACCESS_MANY
131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
132 #endif
133
134 #ifndef LGRP_RSRC_CPU
135 #define LGRP_RSRC_CPU 0 /* CPU resources */
136 #endif
137 #ifndef LGRP_RSRC_MEM
138 #define LGRP_RSRC_MEM 1 /* memory resources */
139 #endif
140
141 // Values for ThreadPriorityPolicy == 1
142 int prio_policy1[CriticalPriority+1] = {
143 -99999, 0, 16, 32, 48, 64,
144 80, 96, 112, 124, 127, 127 };
145
146 // System parameters used internally
147 static clock_t clock_tics_per_sec = 100;
148
149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
150 static bool enabled_extended_FILE_stdio = false;
151
152 // For diagnostics to print a message once. see run_periodic_checks
153 static bool check_addr0_done = false;
154 static sigset_t check_signal_done;
155 static bool check_signals = true;
156
157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
159
160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
161
162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
163
164 // "default" initializers for missing libc APIs
165 extern "C" {
166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
168
169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
170 static int lwp_cond_destroy(cond_t *cv) { return 0; }
171 }
172
173 // "default" initializers for pthread-based synchronization
174 extern "C" {
175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
177 }
178
179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
180
181 static inline size_t adjust_stack_size(address base, size_t size) {
182 if ((ssize_t)size < 0) {
183 // 4759953: Compensate for ridiculous stack size.
184 size = max_intx;
185 }
186 if (size > (size_t)base) {
187 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
188 size = (size_t)base;
189 }
190 return size;
191 }
192
193 static inline stack_t get_stack_info() {
194 stack_t st;
195 int retval = thr_stksegment(&st);
196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
197 assert(retval == 0, "incorrect return value from thr_stksegment");
198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
200 return st;
201 }
202
203 bool os::is_primordial_thread(void) {
204 int r = thr_main();
205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
206 return r == 1;
207 }
208
209 address os::current_stack_base() {
210 bool _is_primordial_thread = is_primordial_thread();
211
212 // Workaround 4352906, avoid calls to thr_stksegment by
213 // thr_main after the first one (it looks like we trash
214 // some data, causing the value for ss_sp to be incorrect).
215 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
216 stack_t st = get_stack_info();
217 if (_is_primordial_thread) {
218 // cache initial value of stack base
219 os::Solaris::_main_stack_base = (address)st.ss_sp;
220 }
221 return (address)st.ss_sp;
222 } else {
223 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
224 return os::Solaris::_main_stack_base;
225 }
226 }
227
228 size_t os::current_stack_size() {
229 size_t size;
230
231 if (!is_primordial_thread()) {
232 size = get_stack_info().ss_size;
233 } else {
234 struct rlimit limits;
235 getrlimit(RLIMIT_STACK, &limits);
236 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
237 }
238 // base may not be page aligned
239 address base = current_stack_base();
240 address bottom = align_up(base - size, os::vm_page_size());;
241 return (size_t)(base - bottom);
242 }
243
244 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
245 return localtime_r(clock, res);
246 }
247
248 void os::Solaris::try_enable_extended_io() {
249 typedef int (*enable_extended_FILE_stdio_t)(int, int);
250
251 if (!UseExtendedFileIO) {
252 return;
253 }
254
255 enable_extended_FILE_stdio_t enabler =
256 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
257 "enable_extended_FILE_stdio");
258 if (enabler) {
259 enabler(-1, -1);
260 }
261 }
262
263 static int _processors_online = 0;
264
265 jint os::Solaris::_os_thread_limit = 0;
266 volatile jint os::Solaris::_os_thread_count = 0;
267
268 julong os::available_memory() {
269 return Solaris::available_memory();
270 }
271
272 julong os::Solaris::available_memory() {
273 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
274 }
275
276 julong os::Solaris::_physical_memory = 0;
277
278 julong os::physical_memory() {
279 return Solaris::physical_memory();
280 }
281
282 static hrtime_t first_hrtime = 0;
283 static const hrtime_t hrtime_hz = 1000*1000*1000;
284 static volatile hrtime_t max_hrtime = 0;
285
286
287 void os::Solaris::initialize_system_info() {
288 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
289 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
290 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
291 (julong)sysconf(_SC_PAGESIZE);
292 }
293
294 int os::active_processor_count() {
295 // User has overridden the number of active processors
296 if (ActiveProcessorCount > 0) {
297 log_trace(os)("active_processor_count: "
298 "active processor count set by user : %d",
299 ActiveProcessorCount);
300 return ActiveProcessorCount;
301 }
302
303 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
304 pid_t pid = getpid();
305 psetid_t pset = PS_NONE;
306 // Are we running in a processor set or is there any processor set around?
307 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
308 uint_t pset_cpus;
309 // Query the number of cpus available to us.
310 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
311 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
312 _processors_online = pset_cpus;
313 return pset_cpus;
314 }
315 }
316 // Otherwise return number of online cpus
317 return online_cpus;
318 }
319
320 static bool find_processors_in_pset(psetid_t pset,
321 processorid_t** id_array,
322 uint_t* id_length) {
323 bool result = false;
324 // Find the number of processors in the processor set.
325 if (pset_info(pset, NULL, id_length, NULL) == 0) {
326 // Make up an array to hold their ids.
327 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
328 // Fill in the array with their processor ids.
329 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
330 result = true;
331 }
332 }
333 return result;
334 }
335
336 // Callers of find_processors_online() must tolerate imprecise results --
337 // the system configuration can change asynchronously because of DR
338 // or explicit psradm operations.
339 //
340 // We also need to take care that the loop (below) terminates as the
341 // number of processors online can change between the _SC_NPROCESSORS_ONLN
342 // request and the loop that builds the list of processor ids. Unfortunately
343 // there's no reliable way to determine the maximum valid processor id,
344 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
345 // man pages, which claim the processor id set is "sparse, but
346 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
347 // exit the loop.
348 //
349 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
350 // not available on S8.0.
351
352 static bool find_processors_online(processorid_t** id_array,
353 uint* id_length) {
354 const processorid_t MAX_PROCESSOR_ID = 100000;
355 // Find the number of processors online.
356 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
357 // Make up an array to hold their ids.
358 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
359 // Processors need not be numbered consecutively.
360 long found = 0;
361 processorid_t next = 0;
362 while (found < *id_length && next < MAX_PROCESSOR_ID) {
363 processor_info_t info;
364 if (processor_info(next, &info) == 0) {
365 // NB, PI_NOINTR processors are effectively online ...
366 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
367 (*id_array)[found] = next;
368 found += 1;
369 }
370 }
371 next += 1;
372 }
373 if (found < *id_length) {
374 // The loop above didn't identify the expected number of processors.
375 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
376 // and re-running the loop, above, but there's no guarantee of progress
377 // if the system configuration is in flux. Instead, we just return what
378 // we've got. Note that in the worst case find_processors_online() could
379 // return an empty set. (As a fall-back in the case of the empty set we
380 // could just return the ID of the current processor).
381 *id_length = found;
382 }
383
384 return true;
385 }
386
387 static bool assign_distribution(processorid_t* id_array,
388 uint id_length,
389 uint* distribution,
390 uint distribution_length) {
391 // We assume we can assign processorid_t's to uint's.
392 assert(sizeof(processorid_t) == sizeof(uint),
393 "can't convert processorid_t to uint");
394 // Quick check to see if we won't succeed.
395 if (id_length < distribution_length) {
396 return false;
397 }
398 // Assign processor ids to the distribution.
399 // Try to shuffle processors to distribute work across boards,
400 // assuming 4 processors per board.
401 const uint processors_per_board = ProcessDistributionStride;
402 // Find the maximum processor id.
403 processorid_t max_id = 0;
404 for (uint m = 0; m < id_length; m += 1) {
405 max_id = MAX2(max_id, id_array[m]);
406 }
407 // The next id, to limit loops.
408 const processorid_t limit_id = max_id + 1;
409 // Make up markers for available processors.
410 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
411 for (uint c = 0; c < limit_id; c += 1) {
412 available_id[c] = false;
413 }
414 for (uint a = 0; a < id_length; a += 1) {
415 available_id[id_array[a]] = true;
416 }
417 // Step by "boards", then by "slot", copying to "assigned".
418 // NEEDS_CLEANUP: The assignment of processors should be stateful,
419 // remembering which processors have been assigned by
420 // previous calls, etc., so as to distribute several
421 // independent calls of this method. What we'd like is
422 // It would be nice to have an API that let us ask
423 // how many processes are bound to a processor,
424 // but we don't have that, either.
425 // In the short term, "board" is static so that
426 // subsequent distributions don't all start at board 0.
427 static uint board = 0;
428 uint assigned = 0;
429 // Until we've found enough processors ....
430 while (assigned < distribution_length) {
431 // ... find the next available processor in the board.
432 for (uint slot = 0; slot < processors_per_board; slot += 1) {
433 uint try_id = board * processors_per_board + slot;
434 if ((try_id < limit_id) && (available_id[try_id] == true)) {
435 distribution[assigned] = try_id;
436 available_id[try_id] = false;
437 assigned += 1;
438 break;
439 }
440 }
441 board += 1;
442 if (board * processors_per_board + 0 >= limit_id) {
443 board = 0;
444 }
445 }
446 if (available_id != NULL) {
447 FREE_C_HEAP_ARRAY(bool, available_id);
448 }
449 return true;
450 }
451
452 void os::set_native_thread_name(const char *name) {
453 if (Solaris::_pthread_setname_np != NULL) {
454 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
455 // but we explicitly copy into a size-limited buffer to avoid any
456 // possible overflow.
457 char buf[32];
458 snprintf(buf, sizeof(buf), "%s", name);
459 buf[sizeof(buf) - 1] = '\0';
460 Solaris::_pthread_setname_np(pthread_self(), buf);
461 }
462 }
463
464 bool os::distribute_processes(uint length, uint* distribution) {
465 bool result = false;
466 // Find the processor id's of all the available CPUs.
467 processorid_t* id_array = NULL;
468 uint id_length = 0;
469 // There are some races between querying information and using it,
470 // since processor sets can change dynamically.
471 psetid_t pset = PS_NONE;
472 // Are we running in a processor set?
473 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
474 result = find_processors_in_pset(pset, &id_array, &id_length);
475 } else {
476 result = find_processors_online(&id_array, &id_length);
477 }
478 if (result == true) {
479 if (id_length >= length) {
480 result = assign_distribution(id_array, id_length, distribution, length);
481 } else {
482 result = false;
483 }
484 }
485 if (id_array != NULL) {
486 FREE_C_HEAP_ARRAY(processorid_t, id_array);
487 }
488 return result;
489 }
490
491 bool os::bind_to_processor(uint processor_id) {
492 // We assume that a processorid_t can be stored in a uint.
493 assert(sizeof(uint) == sizeof(processorid_t),
494 "can't convert uint to processorid_t");
495 int bind_result =
496 processor_bind(P_LWPID, // bind LWP.
497 P_MYID, // bind current LWP.
498 (processorid_t) processor_id, // id.
499 NULL); // don't return old binding.
500 return (bind_result == 0);
501 }
502
503 // Return true if user is running as root.
504
505 bool os::have_special_privileges() {
506 static bool init = false;
507 static bool privileges = false;
508 if (!init) {
509 privileges = (getuid() != geteuid()) || (getgid() != getegid());
510 init = true;
511 }
512 return privileges;
513 }
514
515
516 void os::init_system_properties_values() {
517 // The next steps are taken in the product version:
518 //
519 // Obtain the JAVA_HOME value from the location of libjvm.so.
520 // This library should be located at:
521 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
522 //
523 // If "/jre/lib/" appears at the right place in the path, then we
524 // assume libjvm.so is installed in a JDK and we use this path.
525 //
526 // Otherwise exit with message: "Could not create the Java virtual machine."
527 //
528 // The following extra steps are taken in the debugging version:
529 //
530 // If "/jre/lib/" does NOT appear at the right place in the path
531 // instead of exit check for $JAVA_HOME environment variable.
532 //
533 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
534 // then we append a fake suffix "hotspot/libjvm.so" to this path so
535 // it looks like libjvm.so is installed there
536 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
537 //
538 // Otherwise exit.
539 //
540 // Important note: if the location of libjvm.so changes this
541 // code needs to be changed accordingly.
542
543 // Base path of extensions installed on the system.
544 #define SYS_EXT_DIR "/usr/jdk/packages"
545 #define EXTENSIONS_DIR "/lib/ext"
546
547 // Buffer that fits several sprintfs.
548 // Note that the space for the colon and the trailing null are provided
549 // by the nulls included by the sizeof operator.
550 const size_t bufsize =
551 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
552 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
553 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
554 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
555
556 // sysclasspath, java_home, dll_dir
557 {
558 char *pslash;
559 os::jvm_path(buf, bufsize);
560
561 // Found the full path to libjvm.so.
562 // Now cut the path to <java_home>/jre if we can.
563 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
564 pslash = strrchr(buf, '/');
565 if (pslash != NULL) {
566 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
567 }
568 Arguments::set_dll_dir(buf);
569
570 if (pslash != NULL) {
571 pslash = strrchr(buf, '/');
572 if (pslash != NULL) {
573 *pslash = '\0'; // Get rid of /lib.
574 }
575 }
576 Arguments::set_java_home(buf);
577 set_boot_path('/', ':');
578 }
579
580 // Where to look for native libraries.
581 {
582 // Use dlinfo() to determine the correct java.library.path.
583 //
584 // If we're launched by the Java launcher, and the user
585 // does not set java.library.path explicitly on the commandline,
586 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
587 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
588 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
589 // /usr/lib), which is exactly what we want.
590 //
591 // If the user does set java.library.path, it completely
592 // overwrites this setting, and always has.
593 //
594 // If we're not launched by the Java launcher, we may
595 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
596 // settings. Again, dlinfo does exactly what we want.
597
598 Dl_serinfo info_sz, *info = &info_sz;
599 Dl_serpath *path;
600 char *library_path;
601 char *common_path = buf;
602
603 // Determine search path count and required buffer size.
604 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
605 FREE_C_HEAP_ARRAY(char, buf);
606 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
607 }
608
609 // Allocate new buffer and initialize.
610 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
611 info->dls_size = info_sz.dls_size;
612 info->dls_cnt = info_sz.dls_cnt;
613
614 // Obtain search path information.
615 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
616 FREE_C_HEAP_ARRAY(char, buf);
617 FREE_C_HEAP_ARRAY(char, info);
618 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
619 }
620
621 path = &info->dls_serpath[0];
622
623 // Note: Due to a legacy implementation, most of the library path
624 // is set in the launcher. This was to accomodate linking restrictions
625 // on legacy Solaris implementations (which are no longer supported).
626 // Eventually, all the library path setting will be done here.
627 //
628 // However, to prevent the proliferation of improperly built native
629 // libraries, the new path component /usr/jdk/packages is added here.
630
631 // Construct the invariant part of ld_library_path.
632 sprintf(common_path, SYS_EXT_DIR "/lib");
633
634 // Struct size is more than sufficient for the path components obtained
635 // through the dlinfo() call, so only add additional space for the path
636 // components explicitly added here.
637 size_t library_path_size = info->dls_size + strlen(common_path);
638 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
639 library_path[0] = '\0';
640
641 // Construct the desired Java library path from the linker's library
642 // search path.
643 //
644 // For compatibility, it is optimal that we insert the additional path
645 // components specific to the Java VM after those components specified
646 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
647 // infrastructure.
648 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
649 strcpy(library_path, common_path);
650 } else {
651 int inserted = 0;
652 int i;
653 for (i = 0; i < info->dls_cnt; i++, path++) {
654 uint_t flags = path->dls_flags & LA_SER_MASK;
655 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
656 strcat(library_path, common_path);
657 strcat(library_path, os::path_separator());
658 inserted = 1;
659 }
660 strcat(library_path, path->dls_name);
661 strcat(library_path, os::path_separator());
662 }
663 // Eliminate trailing path separator.
664 library_path[strlen(library_path)-1] = '\0';
665 }
666
667 // happens before argument parsing - can't use a trace flag
668 // tty->print_raw("init_system_properties_values: native lib path: ");
669 // tty->print_raw_cr(library_path);
670
671 // Callee copies into its own buffer.
672 Arguments::set_library_path(library_path);
673
674 FREE_C_HEAP_ARRAY(char, library_path);
675 FREE_C_HEAP_ARRAY(char, info);
676 }
677
678 // Extensions directories.
679 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
680 Arguments::set_ext_dirs(buf);
681
682 FREE_C_HEAP_ARRAY(char, buf);
683
684 #undef SYS_EXT_DIR
685 #undef EXTENSIONS_DIR
686 }
687
688 void os::breakpoint() {
689 BREAKPOINT;
690 }
691
692 bool os::obsolete_option(const JavaVMOption *option) {
693 if (!strncmp(option->optionString, "-Xt", 3)) {
694 return true;
695 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
696 return true;
697 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
698 return true;
699 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
700 return true;
701 }
702 return false;
703 }
704
705 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
706 address stackStart = (address)thread->stack_base();
707 address stackEnd = (address)(stackStart - (address)thread->stack_size());
708 if (sp < stackStart && sp >= stackEnd) return true;
709 return false;
710 }
711
712 extern "C" void breakpoint() {
713 // use debugger to set breakpoint here
714 }
715
716 static thread_t main_thread;
717
718 // Thread start routine for all newly created threads
719 extern "C" void* thread_native_entry(void* thread_addr) {
720 // Try to randomize the cache line index of hot stack frames.
721 // This helps when threads of the same stack traces evict each other's
722 // cache lines. The threads can be either from the same JVM instance, or
723 // from different JVM instances. The benefit is especially true for
724 // processors with hyperthreading technology.
725 static int counter = 0;
726 int pid = os::current_process_id();
727 alloca(((pid ^ counter++) & 7) * 128);
728
729 int prio;
730 Thread* thread = (Thread*)thread_addr;
731
732 thread->initialize_thread_current();
733
734 OSThread* osthr = thread->osthread();
735
736 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
737 thread->_schedctl = (void *) schedctl_init();
738
739 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
740 os::current_thread_id());
741
742 if (UseNUMA) {
743 int lgrp_id = os::numa_get_group_id();
744 if (lgrp_id != -1) {
745 thread->set_lgrp_id(lgrp_id);
746 }
747 }
748
749 // Our priority was set when we were created, and stored in the
750 // osthread, but couldn't be passed through to our LWP until now.
751 // So read back the priority and set it again.
752
753 if (osthr->thread_id() != -1) {
754 if (UseThreadPriorities) {
755 int prio = osthr->native_priority();
756 if (ThreadPriorityVerbose) {
757 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
758 INTPTR_FORMAT ", setting priority: %d\n",
759 osthr->thread_id(), osthr->lwp_id(), prio);
760 }
761 os::set_native_priority(thread, prio);
762 }
763 } else if (ThreadPriorityVerbose) {
764 warning("Can't set priority in _start routine, thread id hasn't been set\n");
765 }
766
767 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
768
769 // initialize signal mask for this thread
770 os::Solaris::hotspot_sigmask(thread);
771
772 thread->run();
773
774 // One less thread is executing
775 // When the VMThread gets here, the main thread may have already exited
776 // which frees the CodeHeap containing the Atomic::dec code
777 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
778 Atomic::dec(&os::Solaris::_os_thread_count);
779 }
780
781 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
782
783 // If a thread has not deleted itself ("delete this") as part of its
784 // termination sequence, we have to ensure thread-local-storage is
785 // cleared before we actually terminate. No threads should ever be
786 // deleted asynchronously with respect to their termination.
787 if (Thread::current_or_null_safe() != NULL) {
788 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
789 thread->clear_thread_current();
790 }
791
792 if (UseDetachedThreads) {
793 thr_exit(NULL);
794 ShouldNotReachHere();
795 }
796 return NULL;
797 }
798
799 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
800 // Allocate the OSThread object
801 OSThread* osthread = new OSThread(NULL, NULL);
802 if (osthread == NULL) return NULL;
803
804 // Store info on the Solaris thread into the OSThread
805 osthread->set_thread_id(thread_id);
806 osthread->set_lwp_id(_lwp_self());
807 thread->_schedctl = (void *) schedctl_init();
808
809 if (UseNUMA) {
810 int lgrp_id = os::numa_get_group_id();
811 if (lgrp_id != -1) {
812 thread->set_lgrp_id(lgrp_id);
813 }
814 }
815
816 if (ThreadPriorityVerbose) {
817 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
818 osthread->thread_id(), osthread->lwp_id());
819 }
820
821 // Initial thread state is INITIALIZED, not SUSPENDED
822 osthread->set_state(INITIALIZED);
823
824 return osthread;
825 }
826
827 void os::Solaris::hotspot_sigmask(Thread* thread) {
828 //Save caller's signal mask
829 sigset_t sigmask;
830 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
831 OSThread *osthread = thread->osthread();
832 osthread->set_caller_sigmask(sigmask);
833
834 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
835 if (!ReduceSignalUsage) {
836 if (thread->is_VM_thread()) {
837 // Only the VM thread handles BREAK_SIGNAL ...
838 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
839 } else {
840 // ... all other threads block BREAK_SIGNAL
841 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
842 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
843 }
844 }
845 }
846
847 bool os::create_attached_thread(JavaThread* thread) {
848 #ifdef ASSERT
849 thread->verify_not_published();
850 #endif
851 OSThread* osthread = create_os_thread(thread, thr_self());
852 if (osthread == NULL) {
853 return false;
854 }
855
856 // Initial thread state is RUNNABLE
857 osthread->set_state(RUNNABLE);
858 thread->set_osthread(osthread);
859
860 // initialize signal mask for this thread
861 // and save the caller's signal mask
862 os::Solaris::hotspot_sigmask(thread);
863
864 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
865 os::current_thread_id());
866
867 return true;
868 }
869
870 bool os::create_main_thread(JavaThread* thread) {
871 #ifdef ASSERT
872 thread->verify_not_published();
873 #endif
874 if (_starting_thread == NULL) {
875 _starting_thread = create_os_thread(thread, main_thread);
876 if (_starting_thread == NULL) {
877 return false;
878 }
879 }
880
881 // The primodial thread is runnable from the start
882 _starting_thread->set_state(RUNNABLE);
883
884 thread->set_osthread(_starting_thread);
885
886 // initialize signal mask for this thread
887 // and save the caller's signal mask
888 os::Solaris::hotspot_sigmask(thread);
889
890 return true;
891 }
892
893 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
894 static char* describe_thr_create_attributes(char* buf, size_t buflen,
895 size_t stacksize, long flags) {
896 stringStream ss(buf, buflen);
897 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
898 ss.print("flags: ");
899 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
900 #define ALL(X) \
901 X(THR_SUSPENDED) \
902 X(THR_DETACHED) \
903 X(THR_BOUND) \
904 X(THR_NEW_LWP) \
905 X(THR_DAEMON)
906 ALL(PRINT_FLAG)
907 #undef ALL
908 #undef PRINT_FLAG
909 return buf;
910 }
911
912 // return default stack size for thr_type
913 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
914 // default stack size when not specified by caller is 1M (2M for LP64)
915 size_t s = (BytesPerWord >> 2) * K * K;
916 return s;
917 }
918
919 bool os::create_thread(Thread* thread, ThreadType thr_type,
920 size_t req_stack_size) {
921 // Allocate the OSThread object
922 OSThread* osthread = new OSThread(NULL, NULL);
923 if (osthread == NULL) {
924 return false;
925 }
926
927 if (ThreadPriorityVerbose) {
928 char *thrtyp;
929 switch (thr_type) {
930 case vm_thread:
931 thrtyp = (char *)"vm";
932 break;
933 case cgc_thread:
934 thrtyp = (char *)"cgc";
935 break;
936 case pgc_thread:
937 thrtyp = (char *)"pgc";
938 break;
939 case java_thread:
940 thrtyp = (char *)"java";
941 break;
942 case compiler_thread:
943 thrtyp = (char *)"compiler";
944 break;
945 case watcher_thread:
946 thrtyp = (char *)"watcher";
947 break;
948 default:
949 thrtyp = (char *)"unknown";
950 break;
951 }
952 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
953 }
954
955 // calculate stack size if it's not specified by caller
956 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
957
958 // Initial state is ALLOCATED but not INITIALIZED
959 osthread->set_state(ALLOCATED);
960
961 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
962 // We got lots of threads. Check if we still have some address space left.
963 // Need to be at least 5Mb of unreserved address space. We do check by
964 // trying to reserve some.
965 const size_t VirtualMemoryBangSize = 20*K*K;
966 char* mem = os::reserve_memory(VirtualMemoryBangSize);
967 if (mem == NULL) {
968 delete osthread;
969 return false;
970 } else {
971 // Release the memory again
972 os::release_memory(mem, VirtualMemoryBangSize);
973 }
974 }
975
976 // Setup osthread because the child thread may need it.
977 thread->set_osthread(osthread);
978
979 // Create the Solaris thread
980 thread_t tid = 0;
981 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
982 int status;
983
984 // Mark that we don't have an lwp or thread id yet.
985 // In case we attempt to set the priority before the thread starts.
986 osthread->set_lwp_id(-1);
987 osthread->set_thread_id(-1);
988
989 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
990
991 char buf[64];
992 if (status == 0) {
993 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
994 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
995 } else {
996 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
997 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
998 }
999
1000 if (status != 0) {
1001 thread->set_osthread(NULL);
1002 // Need to clean up stuff we've allocated so far
1003 delete osthread;
1004 return false;
1005 }
1006
1007 Atomic::inc(&os::Solaris::_os_thread_count);
1008
1009 // Store info on the Solaris thread into the OSThread
1010 osthread->set_thread_id(tid);
1011
1012 // Remember that we created this thread so we can set priority on it
1013 osthread->set_vm_created();
1014
1015 // Most thread types will set an explicit priority before starting the thread,
1016 // but for those that don't we need a valid value to read back in thread_native_entry.
1017 osthread->set_native_priority(NormPriority);
1018
1019 // Initial thread state is INITIALIZED, not SUSPENDED
1020 osthread->set_state(INITIALIZED);
1021
1022 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1023 return true;
1024 }
1025
1026 debug_only(static bool signal_sets_initialized = false);
1027 static sigset_t unblocked_sigs, vm_sigs;
1028
1029 bool os::Solaris::is_sig_ignored(int sig) {
1030 struct sigaction oact;
1031 sigaction(sig, (struct sigaction*)NULL, &oact);
1032 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1033 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1034 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1035 return true;
1036 } else {
1037 return false;
1038 }
1039 }
1040
1041 void os::Solaris::signal_sets_init() {
1042 // Should also have an assertion stating we are still single-threaded.
1043 assert(!signal_sets_initialized, "Already initialized");
1044 // Fill in signals that are necessarily unblocked for all threads in
1045 // the VM. Currently, we unblock the following signals:
1046 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1047 // by -Xrs (=ReduceSignalUsage));
1048 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1049 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1050 // the dispositions or masks wrt these signals.
1051 // Programs embedding the VM that want to use the above signals for their
1052 // own purposes must, at this time, use the "-Xrs" option to prevent
1053 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1054 // (See bug 4345157, and other related bugs).
1055 // In reality, though, unblocking these signals is really a nop, since
1056 // these signals are not blocked by default.
1057 sigemptyset(&unblocked_sigs);
1058 sigaddset(&unblocked_sigs, SIGILL);
1059 sigaddset(&unblocked_sigs, SIGSEGV);
1060 sigaddset(&unblocked_sigs, SIGBUS);
1061 sigaddset(&unblocked_sigs, SIGFPE);
1062 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1063
1064 if (!ReduceSignalUsage) {
1065 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1066 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1067 }
1068 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1069 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1070 }
1071 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1072 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1073 }
1074 }
1075 // Fill in signals that are blocked by all but the VM thread.
1076 sigemptyset(&vm_sigs);
1077 if (!ReduceSignalUsage) {
1078 sigaddset(&vm_sigs, BREAK_SIGNAL);
1079 }
1080 debug_only(signal_sets_initialized = true);
1081
1082 // For diagnostics only used in run_periodic_checks
1083 sigemptyset(&check_signal_done);
1084 }
1085
1086 // These are signals that are unblocked while a thread is running Java.
1087 // (For some reason, they get blocked by default.)
1088 sigset_t* os::Solaris::unblocked_signals() {
1089 assert(signal_sets_initialized, "Not initialized");
1090 return &unblocked_sigs;
1091 }
1092
1093 // These are the signals that are blocked while a (non-VM) thread is
1094 // running Java. Only the VM thread handles these signals.
1095 sigset_t* os::Solaris::vm_signals() {
1096 assert(signal_sets_initialized, "Not initialized");
1097 return &vm_sigs;
1098 }
1099
1100 void _handle_uncaught_cxx_exception() {
1101 VMError::report_and_die("An uncaught C++ exception");
1102 }
1103
1104
1105 // First crack at OS-specific initialization, from inside the new thread.
1106 void os::initialize_thread(Thread* thr) {
1107 if (is_primordial_thread()) {
1108 JavaThread* jt = (JavaThread *)thr;
1109 assert(jt != NULL, "Sanity check");
1110 size_t stack_size;
1111 address base = jt->stack_base();
1112 if (Arguments::created_by_java_launcher()) {
1113 // Use 2MB to allow for Solaris 7 64 bit mode.
1114 stack_size = JavaThread::stack_size_at_create() == 0
1115 ? 2048*K : JavaThread::stack_size_at_create();
1116
1117 // There are rare cases when we may have already used more than
1118 // the basic stack size allotment before this method is invoked.
1119 // Attempt to allow for a normally sized java_stack.
1120 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1121 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1122 } else {
1123 // 6269555: If we were not created by a Java launcher, i.e. if we are
1124 // running embedded in a native application, treat the primordial thread
1125 // as much like a native attached thread as possible. This means using
1126 // the current stack size from thr_stksegment(), unless it is too large
1127 // to reliably setup guard pages. A reasonable max size is 8MB.
1128 size_t current_size = current_stack_size();
1129 // This should never happen, but just in case....
1130 if (current_size == 0) current_size = 2 * K * K;
1131 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1132 }
1133 address bottom = align_up(base - stack_size, os::vm_page_size());;
1134 stack_size = (size_t)(base - bottom);
1135
1136 assert(stack_size > 0, "Stack size calculation problem");
1137
1138 if (stack_size > jt->stack_size()) {
1139 #ifndef PRODUCT
1140 struct rlimit limits;
1141 getrlimit(RLIMIT_STACK, &limits);
1142 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1143 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1144 #endif
1145 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1146 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1147 "See limit(1) to increase the stack size limit.",
1148 stack_size / K, jt->stack_size() / K);
1149 vm_exit(1);
1150 }
1151 assert(jt->stack_size() >= stack_size,
1152 "Attempt to map more stack than was allocated");
1153 jt->set_stack_size(stack_size);
1154 }
1155
1156 // With the T2 libthread (T1 is no longer supported) threads are always bound
1157 // and we use stackbanging in all cases.
1158
1159 os::Solaris::init_thread_fpu_state();
1160 std::set_terminate(_handle_uncaught_cxx_exception);
1161 }
1162
1163
1164
1165 // Free Solaris resources related to the OSThread
1166 void os::free_thread(OSThread* osthread) {
1167 assert(osthread != NULL, "os::free_thread but osthread not set");
1168
1169 // We are told to free resources of the argument thread,
1170 // but we can only really operate on the current thread.
1171 assert(Thread::current()->osthread() == osthread,
1172 "os::free_thread but not current thread");
1173
1174 // Restore caller's signal mask
1175 sigset_t sigmask = osthread->caller_sigmask();
1176 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1177
1178 delete osthread;
1179 }
1180
1181 void os::pd_start_thread(Thread* thread) {
1182 int status = thr_continue(thread->osthread()->thread_id());
1183 assert_status(status == 0, status, "thr_continue failed");
1184 }
1185
1186
1187 intx os::current_thread_id() {
1188 return (intx)thr_self();
1189 }
1190
1191 static pid_t _initial_pid = 0;
1192
1193 int os::current_process_id() {
1194 return (int)(_initial_pid ? _initial_pid : getpid());
1195 }
1196
1197 // gethrtime() should be monotonic according to the documentation,
1198 // but some virtualized platforms are known to break this guarantee.
1199 // getTimeNanos() must be guaranteed not to move backwards, so we
1200 // are forced to add a check here.
1201 inline hrtime_t getTimeNanos() {
1202 const hrtime_t now = gethrtime();
1203 const hrtime_t prev = max_hrtime;
1204 if (now <= prev) {
1205 return prev; // same or retrograde time;
1206 }
1207 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev);
1208 assert(obsv >= prev, "invariant"); // Monotonicity
1209 // If the CAS succeeded then we're done and return "now".
1210 // If the CAS failed and the observed value "obsv" is >= now then
1211 // we should return "obsv". If the CAS failed and now > obsv > prv then
1212 // some other thread raced this thread and installed a new value, in which case
1213 // we could either (a) retry the entire operation, (b) retry trying to install now
1214 // or (c) just return obsv. We use (c). No loop is required although in some cases
1215 // we might discard a higher "now" value in deference to a slightly lower but freshly
1216 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1217 // to (a) or (b) -- and greatly reduces coherence traffic.
1218 // We might also condition (c) on the magnitude of the delta between obsv and now.
1219 // Avoiding excessive CAS operations to hot RW locations is critical.
1220 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1221 return (prev == obsv) ? now : obsv;
1222 }
1223
1224 // Time since start-up in seconds to a fine granularity.
1225 // Used by VMSelfDestructTimer and the MemProfiler.
1226 double os::elapsedTime() {
1227 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1228 }
1229
1230 jlong os::elapsed_counter() {
1231 return (jlong)(getTimeNanos() - first_hrtime);
1232 }
1233
1234 jlong os::elapsed_frequency() {
1235 return hrtime_hz;
1236 }
1237
1238 // Return the real, user, and system times in seconds from an
1239 // arbitrary fixed point in the past.
1240 bool os::getTimesSecs(double* process_real_time,
1241 double* process_user_time,
1242 double* process_system_time) {
1243 struct tms ticks;
1244 clock_t real_ticks = times(&ticks);
1245
1246 if (real_ticks == (clock_t) (-1)) {
1247 return false;
1248 } else {
1249 double ticks_per_second = (double) clock_tics_per_sec;
1250 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1251 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1252 // For consistency return the real time from getTimeNanos()
1253 // converted to seconds.
1254 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1255
1256 return true;
1257 }
1258 }
1259
1260 bool os::supports_vtime() { return true; }
1261 bool os::enable_vtime() { return false; }
1262 bool os::vtime_enabled() { return false; }
1263
1264 double os::elapsedVTime() {
1265 return (double)gethrvtime() / (double)hrtime_hz;
1266 }
1267
1268 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1269 jlong os::javaTimeMillis() {
1270 timeval t;
1271 if (gettimeofday(&t, NULL) == -1) {
1272 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1273 }
1274 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1275 }
1276
1277 // Must return seconds+nanos since Jan 1 1970. This must use the same
1278 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1279 // we need better than 1ms accuracy
1280 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1281 timeval t;
1282 if (gettimeofday(&t, NULL) == -1) {
1283 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1284 }
1285 seconds = jlong(t.tv_sec);
1286 nanos = jlong(t.tv_usec) * 1000;
1287 }
1288
1289
1290 jlong os::javaTimeNanos() {
1291 return (jlong)getTimeNanos();
1292 }
1293
1294 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1295 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1296 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1297 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1298 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1299 }
1300
1301 char * os::local_time_string(char *buf, size_t buflen) {
1302 struct tm t;
1303 time_t long_time;
1304 time(&long_time);
1305 localtime_r(&long_time, &t);
1306 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1307 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1308 t.tm_hour, t.tm_min, t.tm_sec);
1309 return buf;
1310 }
1311
1312 // Note: os::shutdown() might be called very early during initialization, or
1313 // called from signal handler. Before adding something to os::shutdown(), make
1314 // sure it is async-safe and can handle partially initialized VM.
1315 void os::shutdown() {
1316
1317 // allow PerfMemory to attempt cleanup of any persistent resources
1318 perfMemory_exit();
1319
1320 // needs to remove object in file system
1321 AttachListener::abort();
1322
1323 // flush buffered output, finish log files
1324 ostream_abort();
1325
1326 // Check for abort hook
1327 abort_hook_t abort_hook = Arguments::abort_hook();
1328 if (abort_hook != NULL) {
1329 abort_hook();
1330 }
1331 }
1332
1333 // Note: os::abort() might be called very early during initialization, or
1334 // called from signal handler. Before adding something to os::abort(), make
1335 // sure it is async-safe and can handle partially initialized VM.
1336 void os::abort(bool dump_core, void* siginfo, const void* context) {
1337 os::shutdown();
1338 if (dump_core) {
1339 #ifndef PRODUCT
1340 fdStream out(defaultStream::output_fd());
1341 out.print_raw("Current thread is ");
1342 char buf[16];
1343 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1344 out.print_raw_cr(buf);
1345 out.print_raw_cr("Dumping core ...");
1346 #endif
1347 ::abort(); // dump core (for debugging)
1348 }
1349
1350 ::exit(1);
1351 }
1352
1353 // Die immediately, no exit hook, no abort hook, no cleanup.
1354 void os::die() {
1355 ::abort(); // dump core (for debugging)
1356 }
1357
1358 // DLL functions
1359
1360 const char* os::dll_file_extension() { return ".so"; }
1361
1362 // This must be hard coded because it's the system's temporary
1363 // directory not the java application's temp directory, ala java.io.tmpdir.
1364 const char* os::get_temp_directory() { return "/tmp"; }
1365
1366 // check if addr is inside libjvm.so
1367 bool os::address_is_in_vm(address addr) {
1368 static address libjvm_base_addr;
1369 Dl_info dlinfo;
1370
1371 if (libjvm_base_addr == NULL) {
1372 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1373 libjvm_base_addr = (address)dlinfo.dli_fbase;
1374 }
1375 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1376 }
1377
1378 if (dladdr((void *)addr, &dlinfo) != 0) {
1379 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1380 }
1381
1382 return false;
1383 }
1384
1385 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1386 static dladdr1_func_type dladdr1_func = NULL;
1387
1388 bool os::dll_address_to_function_name(address addr, char *buf,
1389 int buflen, int * offset,
1390 bool demangle) {
1391 // buf is not optional, but offset is optional
1392 assert(buf != NULL, "sanity check");
1393
1394 Dl_info dlinfo;
1395
1396 // dladdr1_func was initialized in os::init()
1397 if (dladdr1_func != NULL) {
1398 // yes, we have dladdr1
1399
1400 // Support for dladdr1 is checked at runtime; it may be
1401 // available even if the vm is built on a machine that does
1402 // not have dladdr1 support. Make sure there is a value for
1403 // RTLD_DL_SYMENT.
1404 #ifndef RTLD_DL_SYMENT
1405 #define RTLD_DL_SYMENT 1
1406 #endif
1407 #ifdef _LP64
1408 Elf64_Sym * info;
1409 #else
1410 Elf32_Sym * info;
1411 #endif
1412 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1413 RTLD_DL_SYMENT) != 0) {
1414 // see if we have a matching symbol that covers our address
1415 if (dlinfo.dli_saddr != NULL &&
1416 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1417 if (dlinfo.dli_sname != NULL) {
1418 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1419 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1420 }
1421 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1422 return true;
1423 }
1424 }
1425 // no matching symbol so try for just file info
1426 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1427 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1428 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1429 return true;
1430 }
1431 }
1432 }
1433 buf[0] = '\0';
1434 if (offset != NULL) *offset = -1;
1435 return false;
1436 }
1437
1438 // no, only dladdr is available
1439 if (dladdr((void *)addr, &dlinfo) != 0) {
1440 // see if we have a matching symbol
1441 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1442 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1443 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1444 }
1445 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1446 return true;
1447 }
1448 // no matching symbol so try for just file info
1449 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1450 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1451 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1452 return true;
1453 }
1454 }
1455 }
1456 buf[0] = '\0';
1457 if (offset != NULL) *offset = -1;
1458 return false;
1459 }
1460
1461 bool os::dll_address_to_library_name(address addr, char* buf,
1462 int buflen, int* offset) {
1463 // buf is not optional, but offset is optional
1464 assert(buf != NULL, "sanity check");
1465
1466 Dl_info dlinfo;
1467
1468 if (dladdr((void*)addr, &dlinfo) != 0) {
1469 if (dlinfo.dli_fname != NULL) {
1470 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1471 }
1472 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1473 *offset = addr - (address)dlinfo.dli_fbase;
1474 }
1475 return true;
1476 }
1477
1478 buf[0] = '\0';
1479 if (offset) *offset = -1;
1480 return false;
1481 }
1482
1483 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1484 Dl_info dli;
1485 // Sanity check?
1486 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1487 dli.dli_fname == NULL) {
1488 return 1;
1489 }
1490
1491 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1492 if (handle == NULL) {
1493 return 1;
1494 }
1495
1496 Link_map *map;
1497 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1498 if (map == NULL) {
1499 dlclose(handle);
1500 return 1;
1501 }
1502
1503 while (map->l_prev != NULL) {
1504 map = map->l_prev;
1505 }
1506
1507 while (map != NULL) {
1508 // Iterate through all map entries and call callback with fields of interest
1509 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1510 dlclose(handle);
1511 return 1;
1512 }
1513 map = map->l_next;
1514 }
1515
1516 dlclose(handle);
1517 return 0;
1518 }
1519
1520 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1521 outputStream * out = (outputStream *) param;
1522 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1523 return 0;
1524 }
1525
1526 void os::print_dll_info(outputStream * st) {
1527 st->print_cr("Dynamic libraries:"); st->flush();
1528 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1529 st->print_cr("Error: Cannot print dynamic libraries.");
1530 }
1531 }
1532
1533 // Loads .dll/.so and
1534 // in case of error it checks if .dll/.so was built for the
1535 // same architecture as Hotspot is running on
1536
1537 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1538 void * result= ::dlopen(filename, RTLD_LAZY);
1539 if (result != NULL) {
1540 // Successful loading
1541 return result;
1542 }
1543
1544 Elf32_Ehdr elf_head;
1545
1546 // Read system error message into ebuf
1547 // It may or may not be overwritten below
1548 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1549 ebuf[ebuflen-1]='\0';
1550 int diag_msg_max_length=ebuflen-strlen(ebuf);
1551 char* diag_msg_buf=ebuf+strlen(ebuf);
1552
1553 if (diag_msg_max_length==0) {
1554 // No more space in ebuf for additional diagnostics message
1555 return NULL;
1556 }
1557
1558
1559 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1560
1561 if (file_descriptor < 0) {
1562 // Can't open library, report dlerror() message
1563 return NULL;
1564 }
1565
1566 bool failed_to_read_elf_head=
1567 (sizeof(elf_head)!=
1568 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1569
1570 ::close(file_descriptor);
1571 if (failed_to_read_elf_head) {
1572 // file i/o error - report dlerror() msg
1573 return NULL;
1574 }
1575
1576 typedef struct {
1577 Elf32_Half code; // Actual value as defined in elf.h
1578 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1579 char elf_class; // 32 or 64 bit
1580 char endianess; // MSB or LSB
1581 char* name; // String representation
1582 } arch_t;
1583
1584 static const arch_t arch_array[]={
1585 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1586 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1587 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1588 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1589 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1590 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1591 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1592 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1593 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1594 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1595 };
1596
1597 #if (defined IA32)
1598 static Elf32_Half running_arch_code=EM_386;
1599 #elif (defined AMD64)
1600 static Elf32_Half running_arch_code=EM_X86_64;
1601 #elif (defined IA64)
1602 static Elf32_Half running_arch_code=EM_IA_64;
1603 #elif (defined __sparc) && (defined _LP64)
1604 static Elf32_Half running_arch_code=EM_SPARCV9;
1605 #elif (defined __sparc) && (!defined _LP64)
1606 static Elf32_Half running_arch_code=EM_SPARC;
1607 #elif (defined __powerpc64__)
1608 static Elf32_Half running_arch_code=EM_PPC64;
1609 #elif (defined __powerpc__)
1610 static Elf32_Half running_arch_code=EM_PPC;
1611 #elif (defined ARM)
1612 static Elf32_Half running_arch_code=EM_ARM;
1613 #else
1614 #error Method os::dll_load requires that one of following is defined:\
1615 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1616 #endif
1617
1618 // Identify compatability class for VM's architecture and library's architecture
1619 // Obtain string descriptions for architectures
1620
1621 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1622 int running_arch_index=-1;
1623
1624 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1625 if (running_arch_code == arch_array[i].code) {
1626 running_arch_index = i;
1627 }
1628 if (lib_arch.code == arch_array[i].code) {
1629 lib_arch.compat_class = arch_array[i].compat_class;
1630 lib_arch.name = arch_array[i].name;
1631 }
1632 }
1633
1634 assert(running_arch_index != -1,
1635 "Didn't find running architecture code (running_arch_code) in arch_array");
1636 if (running_arch_index == -1) {
1637 // Even though running architecture detection failed
1638 // we may still continue with reporting dlerror() message
1639 return NULL;
1640 }
1641
1642 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1643 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1644 return NULL;
1645 }
1646
1647 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1648 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1649 return NULL;
1650 }
1651
1652 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1653 if (lib_arch.name!=NULL) {
1654 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1655 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1656 lib_arch.name, arch_array[running_arch_index].name);
1657 } else {
1658 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1659 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1660 lib_arch.code,
1661 arch_array[running_arch_index].name);
1662 }
1663 }
1664
1665 return NULL;
1666 }
1667
1668 void* os::dll_lookup(void* handle, const char* name) {
1669 return dlsym(handle, name);
1670 }
1671
1672 void* os::get_default_process_handle() {
1673 return (void*)::dlopen(NULL, RTLD_LAZY);
1674 }
1675
1676 int os::stat(const char *path, struct stat *sbuf) {
1677 char pathbuf[MAX_PATH];
1678 if (strlen(path) > MAX_PATH - 1) {
1679 errno = ENAMETOOLONG;
1680 return -1;
1681 }
1682 os::native_path(strcpy(pathbuf, path));
1683 return ::stat(pathbuf, sbuf);
1684 }
1685
1686 static inline time_t get_mtime(const char* filename) {
1687 struct stat st;
1688 int ret = os::stat(filename, &st);
1689 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1690 return st.st_mtime;
1691 }
1692
1693 int os::compare_file_modified_times(const char* file1, const char* file2) {
1694 time_t t1 = get_mtime(file1);
1695 time_t t2 = get_mtime(file2);
1696 return t1 - t2;
1697 }
1698
1699 static bool _print_ascii_file(const char* filename, outputStream* st) {
1700 int fd = ::open(filename, O_RDONLY);
1701 if (fd == -1) {
1702 return false;
1703 }
1704
1705 char buf[32];
1706 int bytes;
1707 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1708 st->print_raw(buf, bytes);
1709 }
1710
1711 ::close(fd);
1712
1713 return true;
1714 }
1715
1716 void os::print_os_info_brief(outputStream* st) {
1717 os::Solaris::print_distro_info(st);
1718
1719 os::Posix::print_uname_info(st);
1720
1721 os::Solaris::print_libversion_info(st);
1722 }
1723
1724 void os::print_os_info(outputStream* st) {
1725 st->print("OS:");
1726
1727 os::Solaris::print_distro_info(st);
1728
1729 os::Posix::print_uname_info(st);
1730
1731 os::Solaris::print_libversion_info(st);
1732
1733 os::Posix::print_rlimit_info(st);
1734
1735 os::Posix::print_load_average(st);
1736 }
1737
1738 void os::Solaris::print_distro_info(outputStream* st) {
1739 if (!_print_ascii_file("/etc/release", st)) {
1740 st->print("Solaris");
1741 }
1742 st->cr();
1743 }
1744
1745 void os::get_summary_os_info(char* buf, size_t buflen) {
1746 strncpy(buf, "Solaris", buflen); // default to plain solaris
1747 FILE* fp = fopen("/etc/release", "r");
1748 if (fp != NULL) {
1749 char tmp[256];
1750 // Only get the first line and chop out everything but the os name.
1751 if (fgets(tmp, sizeof(tmp), fp)) {
1752 char* ptr = tmp;
1753 // skip past whitespace characters
1754 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1755 if (*ptr != '\0') {
1756 char* nl = strchr(ptr, '\n');
1757 if (nl != NULL) *nl = '\0';
1758 strncpy(buf, ptr, buflen);
1759 }
1760 }
1761 fclose(fp);
1762 }
1763 }
1764
1765 void os::Solaris::print_libversion_info(outputStream* st) {
1766 st->print(" (T2 libthread)");
1767 st->cr();
1768 }
1769
1770 static bool check_addr0(outputStream* st) {
1771 jboolean status = false;
1772 const int read_chunk = 200;
1773 int ret = 0;
1774 int nmap = 0;
1775 int fd = ::open("/proc/self/map",O_RDONLY);
1776 if (fd >= 0) {
1777 prmap_t *p = NULL;
1778 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1779 if (NULL == mbuff) {
1780 ::close(fd);
1781 return status;
1782 }
1783 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1784 //check if read() has not read partial data
1785 if( 0 != ret % sizeof(prmap_t)){
1786 break;
1787 }
1788 nmap = ret / sizeof(prmap_t);
1789 p = (prmap_t *)mbuff;
1790 for(int i = 0; i < nmap; i++){
1791 if (p->pr_vaddr == 0x0) {
1792 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1793 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1794 st->print("Access: ");
1795 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1796 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1797 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1798 st->cr();
1799 status = true;
1800 }
1801 p++;
1802 }
1803 }
1804 free(mbuff);
1805 ::close(fd);
1806 }
1807 return status;
1808 }
1809
1810 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1811 // Get MHz with system call. We don't seem to already have this.
1812 processor_info_t stats;
1813 processorid_t id = getcpuid();
1814 int clock = 0;
1815 if (processor_info(id, &stats) != -1) {
1816 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1817 }
1818 #ifdef AMD64
1819 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1820 #else
1821 // must be sparc
1822 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1823 #endif
1824 }
1825
1826 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1827 // Nothing to do for now.
1828 }
1829
1830 void os::print_memory_info(outputStream* st) {
1831 st->print("Memory:");
1832 st->print(" %dk page", os::vm_page_size()>>10);
1833 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1834 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1835 st->cr();
1836 (void) check_addr0(st);
1837 }
1838
1839 // Moved from whole group, because we need them here for diagnostic
1840 // prints.
1841 static int Maxsignum = 0;
1842 static int *ourSigFlags = NULL;
1843
1844 int os::Solaris::get_our_sigflags(int sig) {
1845 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1846 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1847 return ourSigFlags[sig];
1848 }
1849
1850 void os::Solaris::set_our_sigflags(int sig, int flags) {
1851 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1852 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1853 ourSigFlags[sig] = flags;
1854 }
1855
1856
1857 static const char* get_signal_handler_name(address handler,
1858 char* buf, int buflen) {
1859 int offset;
1860 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1861 if (found) {
1862 // skip directory names
1863 const char *p1, *p2;
1864 p1 = buf;
1865 size_t len = strlen(os::file_separator());
1866 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1867 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1868 } else {
1869 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1870 }
1871 return buf;
1872 }
1873
1874 static void print_signal_handler(outputStream* st, int sig,
1875 char* buf, size_t buflen) {
1876 struct sigaction sa;
1877
1878 sigaction(sig, NULL, &sa);
1879
1880 st->print("%s: ", os::exception_name(sig, buf, buflen));
1881
1882 address handler = (sa.sa_flags & SA_SIGINFO)
1883 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1884 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1885
1886 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1887 st->print("SIG_DFL");
1888 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1889 st->print("SIG_IGN");
1890 } else {
1891 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1892 }
1893
1894 st->print(", sa_mask[0]=");
1895 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1896
1897 address rh = VMError::get_resetted_sighandler(sig);
1898 // May be, handler was resetted by VMError?
1899 if (rh != NULL) {
1900 handler = rh;
1901 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1902 }
1903
1904 st->print(", sa_flags=");
1905 os::Posix::print_sa_flags(st, sa.sa_flags);
1906
1907 // Check: is it our handler?
1908 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1909 // It is our signal handler
1910 // check for flags
1911 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1912 st->print(
1913 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1914 os::Solaris::get_our_sigflags(sig));
1915 }
1916 }
1917 st->cr();
1918 }
1919
1920 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1921 st->print_cr("Signal Handlers:");
1922 print_signal_handler(st, SIGSEGV, buf, buflen);
1923 print_signal_handler(st, SIGBUS , buf, buflen);
1924 print_signal_handler(st, SIGFPE , buf, buflen);
1925 print_signal_handler(st, SIGPIPE, buf, buflen);
1926 print_signal_handler(st, SIGXFSZ, buf, buflen);
1927 print_signal_handler(st, SIGILL , buf, buflen);
1928 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1929 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1930 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1931 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1932 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1933 }
1934
1935 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1936
1937 // Find the full path to the current module, libjvm.so
1938 void os::jvm_path(char *buf, jint buflen) {
1939 // Error checking.
1940 if (buflen < MAXPATHLEN) {
1941 assert(false, "must use a large-enough buffer");
1942 buf[0] = '\0';
1943 return;
1944 }
1945 // Lazy resolve the path to current module.
1946 if (saved_jvm_path[0] != 0) {
1947 strcpy(buf, saved_jvm_path);
1948 return;
1949 }
1950
1951 Dl_info dlinfo;
1952 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1953 assert(ret != 0, "cannot locate libjvm");
1954 if (ret != 0 && dlinfo.dli_fname != NULL) {
1955 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1956 return;
1957 }
1958 } else {
1959 buf[0] = '\0';
1960 return;
1961 }
1962
1963 if (Arguments::sun_java_launcher_is_altjvm()) {
1964 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1965 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1966 // If "/jre/lib/" appears at the right place in the string, then
1967 // assume we are installed in a JDK and we're done. Otherwise, check
1968 // for a JAVA_HOME environment variable and fix up the path so it
1969 // looks like libjvm.so is installed there (append a fake suffix
1970 // hotspot/libjvm.so).
1971 const char *p = buf + strlen(buf) - 1;
1972 for (int count = 0; p > buf && count < 5; ++count) {
1973 for (--p; p > buf && *p != '/'; --p)
1974 /* empty */ ;
1975 }
1976
1977 if (strncmp(p, "/jre/lib/", 9) != 0) {
1978 // Look for JAVA_HOME in the environment.
1979 char* java_home_var = ::getenv("JAVA_HOME");
1980 if (java_home_var != NULL && java_home_var[0] != 0) {
1981 char* jrelib_p;
1982 int len;
1983
1984 // Check the current module name "libjvm.so".
1985 p = strrchr(buf, '/');
1986 assert(strstr(p, "/libjvm") == p, "invalid library name");
1987
1988 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
1989 return;
1990 }
1991 // determine if this is a legacy image or modules image
1992 // modules image doesn't have "jre" subdirectory
1993 len = strlen(buf);
1994 assert(len < buflen, "Ran out of buffer space");
1995 jrelib_p = buf + len;
1996 snprintf(jrelib_p, buflen-len, "/jre/lib");
1997 if (0 != access(buf, F_OK)) {
1998 snprintf(jrelib_p, buflen-len, "/lib");
1999 }
2000
2001 if (0 == access(buf, F_OK)) {
2002 // Use current module name "libjvm.so"
2003 len = strlen(buf);
2004 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2005 } else {
2006 // Go back to path of .so
2007 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2008 return;
2009 }
2010 }
2011 }
2012 }
2013 }
2014
2015 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2016 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2017 }
2018
2019
2020 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2021 // no prefix required, not even "_"
2022 }
2023
2024
2025 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2026 // no suffix required
2027 }
2028
2029 // This method is a copy of JDK's sysGetLastErrorString
2030 // from src/solaris/hpi/src/system_md.c
2031
2032 size_t os::lasterror(char *buf, size_t len) {
2033 if (errno == 0) return 0;
2034
2035 const char *s = os::strerror(errno);
2036 size_t n = ::strlen(s);
2037 if (n >= len) {
2038 n = len - 1;
2039 }
2040 ::strncpy(buf, s, n);
2041 buf[n] = '\0';
2042 return n;
2043 }
2044
2045
2046 // sun.misc.Signal
2047
2048 extern "C" {
2049 static void UserHandler(int sig, void *siginfo, void *context) {
2050 // Ctrl-C is pressed during error reporting, likely because the error
2051 // handler fails to abort. Let VM die immediately.
2052 if (sig == SIGINT && VMError::is_error_reported()) {
2053 os::die();
2054 }
2055
2056 os::signal_notify(sig);
2057 // We do not need to reinstate the signal handler each time...
2058 }
2059 }
2060
2061 void* os::user_handler() {
2062 return CAST_FROM_FN_PTR(void*, UserHandler);
2063 }
2064
2065 static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) {
2066 struct timespec ts;
2067 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2068
2069 return ts;
2070 }
2071
2072 extern "C" {
2073 typedef void (*sa_handler_t)(int);
2074 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2075 }
2076
2077 void* os::signal(int signal_number, void* handler) {
2078 struct sigaction sigAct, oldSigAct;
2079 sigfillset(&(sigAct.sa_mask));
2080 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2081 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2082
2083 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2084 // -1 means registration failed
2085 return (void *)-1;
2086 }
2087
2088 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2089 }
2090
2091 void os::signal_raise(int signal_number) {
2092 raise(signal_number);
2093 }
2094
2095 // The following code is moved from os.cpp for making this
2096 // code platform specific, which it is by its very nature.
2097
2098 // a counter for each possible signal value
2099 static int Sigexit = 0;
2100 static jint *pending_signals = NULL;
2101 static int *preinstalled_sigs = NULL;
2102 static struct sigaction *chainedsigactions = NULL;
2103 static Semaphore* sig_sem = NULL;
2104 typedef int (*version_getting_t)();
2105 version_getting_t os::Solaris::get_libjsig_version = NULL;
2106
2107 int os::sigexitnum_pd() {
2108 assert(Sigexit > 0, "signal memory not yet initialized");
2109 return Sigexit;
2110 }
2111
2112 void os::Solaris::init_signal_mem() {
2113 // Initialize signal structures
2114 Maxsignum = SIGRTMAX;
2115 Sigexit = Maxsignum+1;
2116 assert(Maxsignum >0, "Unable to obtain max signal number");
2117
2118 // Initialize signal structures
2119 // pending_signals has one int per signal
2120 // The additional signal is for SIGEXIT - exit signal to signal_thread
2121 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2122 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2123
2124 if (UseSignalChaining) {
2125 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2126 * (Maxsignum + 1), mtInternal);
2127 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2128 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2129 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2130 }
2131 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2132 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2133 }
2134
2135 void os::signal_init_pd() {
2136 // Initialize signal semaphore
2137 sig_sem = new Semaphore();
2138 }
2139
2140 void os::signal_notify(int sig) {
2141 if (sig_sem != NULL) {
2142 Atomic::inc(&pending_signals[sig]);
2143 sig_sem->signal();
2144 } else {
2145 // Signal thread is not created with ReduceSignalUsage and signal_init_pd
2146 // initialization isn't called.
2147 assert(ReduceSignalUsage, "signal semaphore should be created");
2148 }
2149 }
2150
2151 static int check_pending_signals() {
2152 int ret;
2153 while (true) {
2154 for (int i = 0; i < Sigexit + 1; i++) {
2155 jint n = pending_signals[i];
2156 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2157 return i;
2158 }
2159 }
2160 JavaThread *thread = JavaThread::current();
2161 ThreadBlockInVM tbivm(thread);
2162
2163 bool threadIsSuspended;
2164 do {
2165 thread->set_suspend_equivalent();
2166 sig_sem->wait();
2167
2168 // were we externally suspended while we were waiting?
2169 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2170 if (threadIsSuspended) {
2171 // The semaphore has been incremented, but while we were waiting
2172 // another thread suspended us. We don't want to continue running
2173 // while suspended because that would surprise the thread that
2174 // suspended us.
2175 sig_sem->signal();
2176
2177 thread->java_suspend_self();
2178 }
2179 } while (threadIsSuspended);
2180 }
2181 }
2182
2183 int os::signal_wait() {
2184 return check_pending_signals();
2185 }
2186
2187 ////////////////////////////////////////////////////////////////////////////////
2188 // Virtual Memory
2189
2190 static int page_size = -1;
2191
2192 int os::vm_page_size() {
2193 assert(page_size != -1, "must call os::init");
2194 return page_size;
2195 }
2196
2197 // Solaris allocates memory by pages.
2198 int os::vm_allocation_granularity() {
2199 assert(page_size != -1, "must call os::init");
2200 return page_size;
2201 }
2202
2203 static bool recoverable_mmap_error(int err) {
2204 // See if the error is one we can let the caller handle. This
2205 // list of errno values comes from the Solaris mmap(2) man page.
2206 switch (err) {
2207 case EBADF:
2208 case EINVAL:
2209 case ENOTSUP:
2210 // let the caller deal with these errors
2211 return true;
2212
2213 default:
2214 // Any remaining errors on this OS can cause our reserved mapping
2215 // to be lost. That can cause confusion where different data
2216 // structures think they have the same memory mapped. The worst
2217 // scenario is if both the VM and a library think they have the
2218 // same memory mapped.
2219 return false;
2220 }
2221 }
2222
2223 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2224 int err) {
2225 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2226 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2227 os::strerror(err), err);
2228 }
2229
2230 static void warn_fail_commit_memory(char* addr, size_t bytes,
2231 size_t alignment_hint, bool exec,
2232 int err) {
2233 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2234 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2235 alignment_hint, exec, os::strerror(err), err);
2236 }
2237
2238 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2239 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2240 size_t size = bytes;
2241 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2242 if (res != NULL) {
2243 if (UseNUMAInterleaving) {
2244 numa_make_global(addr, bytes);
2245 }
2246 return 0;
2247 }
2248
2249 int err = errno; // save errno from mmap() call in mmap_chunk()
2250
2251 if (!recoverable_mmap_error(err)) {
2252 warn_fail_commit_memory(addr, bytes, exec, err);
2253 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2254 }
2255
2256 return err;
2257 }
2258
2259 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2260 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2261 }
2262
2263 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2264 const char* mesg) {
2265 assert(mesg != NULL, "mesg must be specified");
2266 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2267 if (err != 0) {
2268 // the caller wants all commit errors to exit with the specified mesg:
2269 warn_fail_commit_memory(addr, bytes, exec, err);
2270 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2271 }
2272 }
2273
2274 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2275 assert(is_aligned(alignment, (size_t) vm_page_size()),
2276 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2277 alignment, (size_t) vm_page_size());
2278
2279 for (int i = 0; _page_sizes[i] != 0; i++) {
2280 if (is_aligned(alignment, _page_sizes[i])) {
2281 return _page_sizes[i];
2282 }
2283 }
2284
2285 return (size_t) vm_page_size();
2286 }
2287
2288 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2289 size_t alignment_hint, bool exec) {
2290 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2291 if (err == 0 && UseLargePages && alignment_hint > 0) {
2292 assert(is_aligned(bytes, alignment_hint),
2293 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2294
2295 // The syscall memcntl requires an exact page size (see man memcntl for details).
2296 size_t page_size = page_size_for_alignment(alignment_hint);
2297 if (page_size > (size_t) vm_page_size()) {
2298 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2299 }
2300 }
2301 return err;
2302 }
2303
2304 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2305 bool exec) {
2306 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2307 }
2308
2309 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2310 size_t alignment_hint, bool exec,
2311 const char* mesg) {
2312 assert(mesg != NULL, "mesg must be specified");
2313 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2314 if (err != 0) {
2315 // the caller wants all commit errors to exit with the specified mesg:
2316 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2317 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2318 }
2319 }
2320
2321 // Uncommit the pages in a specified region.
2322 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2323 if (madvise(addr, bytes, MADV_FREE) < 0) {
2324 debug_only(warning("MADV_FREE failed."));
2325 return;
2326 }
2327 }
2328
2329 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2330 return os::commit_memory(addr, size, !ExecMem);
2331 }
2332
2333 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2334 return os::uncommit_memory(addr, size);
2335 }
2336
2337 // Change the page size in a given range.
2338 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2339 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2340 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2341 if (UseLargePages) {
2342 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2343 if (page_size > (size_t) vm_page_size()) {
2344 Solaris::setup_large_pages(addr, bytes, page_size);
2345 }
2346 }
2347 }
2348
2349 // Tell the OS to make the range local to the first-touching LWP
2350 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2351 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2352 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2353 debug_only(warning("MADV_ACCESS_LWP failed."));
2354 }
2355 }
2356
2357 // Tell the OS that this range would be accessed from different LWPs.
2358 void os::numa_make_global(char *addr, size_t bytes) {
2359 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2360 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2361 debug_only(warning("MADV_ACCESS_MANY failed."));
2362 }
2363 }
2364
2365 // Get the number of the locality groups.
2366 size_t os::numa_get_groups_num() {
2367 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2368 return n != -1 ? n : 1;
2369 }
2370
2371 // Get a list of leaf locality groups. A leaf lgroup is group that
2372 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2373 // board. An LWP is assigned to one of these groups upon creation.
2374 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2375 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2376 ids[0] = 0;
2377 return 1;
2378 }
2379 int result_size = 0, top = 1, bottom = 0, cur = 0;
2380 for (int k = 0; k < size; k++) {
2381 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2382 (Solaris::lgrp_id_t*)&ids[top], size - top);
2383 if (r == -1) {
2384 ids[0] = 0;
2385 return 1;
2386 }
2387 if (!r) {
2388 // That's a leaf node.
2389 assert(bottom <= cur, "Sanity check");
2390 // Check if the node has memory
2391 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2392 NULL, 0, LGRP_RSRC_MEM) > 0) {
2393 ids[bottom++] = ids[cur];
2394 }
2395 }
2396 top += r;
2397 cur++;
2398 }
2399 if (bottom == 0) {
2400 // Handle a situation, when the OS reports no memory available.
2401 // Assume UMA architecture.
2402 ids[0] = 0;
2403 return 1;
2404 }
2405 return bottom;
2406 }
2407
2408 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2409 bool os::numa_topology_changed() {
2410 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2411 if (is_stale != -1 && is_stale) {
2412 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2413 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2414 assert(c != 0, "Failure to initialize LGRP API");
2415 Solaris::set_lgrp_cookie(c);
2416 return true;
2417 }
2418 return false;
2419 }
2420
2421 // Get the group id of the current LWP.
2422 int os::numa_get_group_id() {
2423 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2424 if (lgrp_id == -1) {
2425 return 0;
2426 }
2427 const int size = os::numa_get_groups_num();
2428 int *ids = (int*)alloca(size * sizeof(int));
2429
2430 // Get the ids of all lgroups with memory; r is the count.
2431 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2432 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2433 if (r <= 0) {
2434 return 0;
2435 }
2436 return ids[os::random() % r];
2437 }
2438
2439 // Request information about the page.
2440 bool os::get_page_info(char *start, page_info* info) {
2441 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2442 uint64_t addr = (uintptr_t)start;
2443 uint64_t outdata[2];
2444 uint_t validity = 0;
2445
2446 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2447 return false;
2448 }
2449
2450 info->size = 0;
2451 info->lgrp_id = -1;
2452
2453 if ((validity & 1) != 0) {
2454 if ((validity & 2) != 0) {
2455 info->lgrp_id = outdata[0];
2456 }
2457 if ((validity & 4) != 0) {
2458 info->size = outdata[1];
2459 }
2460 return true;
2461 }
2462 return false;
2463 }
2464
2465 // Scan the pages from start to end until a page different than
2466 // the one described in the info parameter is encountered.
2467 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2468 page_info* page_found) {
2469 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2470 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2471 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2472 uint_t validity[MAX_MEMINFO_CNT];
2473
2474 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2475 uint64_t p = (uint64_t)start;
2476 while (p < (uint64_t)end) {
2477 addrs[0] = p;
2478 size_t addrs_count = 1;
2479 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2480 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2481 addrs_count++;
2482 }
2483
2484 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2485 return NULL;
2486 }
2487
2488 size_t i = 0;
2489 for (; i < addrs_count; i++) {
2490 if ((validity[i] & 1) != 0) {
2491 if ((validity[i] & 4) != 0) {
2492 if (outdata[types * i + 1] != page_expected->size) {
2493 break;
2494 }
2495 } else if (page_expected->size != 0) {
2496 break;
2497 }
2498
2499 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2500 if (outdata[types * i] != page_expected->lgrp_id) {
2501 break;
2502 }
2503 }
2504 } else {
2505 return NULL;
2506 }
2507 }
2508
2509 if (i < addrs_count) {
2510 if ((validity[i] & 2) != 0) {
2511 page_found->lgrp_id = outdata[types * i];
2512 } else {
2513 page_found->lgrp_id = -1;
2514 }
2515 if ((validity[i] & 4) != 0) {
2516 page_found->size = outdata[types * i + 1];
2517 } else {
2518 page_found->size = 0;
2519 }
2520 return (char*)addrs[i];
2521 }
2522
2523 p = addrs[addrs_count - 1] + page_size;
2524 }
2525 return end;
2526 }
2527
2528 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2529 size_t size = bytes;
2530 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2531 // uncommitted page. Otherwise, the read/write might succeed if we
2532 // have enough swap space to back the physical page.
2533 return
2534 NULL != Solaris::mmap_chunk(addr, size,
2535 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2536 PROT_NONE);
2537 }
2538
2539 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2540 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2541
2542 if (b == MAP_FAILED) {
2543 return NULL;
2544 }
2545 return b;
2546 }
2547
2548 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2549 size_t alignment_hint, bool fixed) {
2550 char* addr = requested_addr;
2551 int flags = MAP_PRIVATE | MAP_NORESERVE;
2552
2553 assert(!(fixed && (alignment_hint > 0)),
2554 "alignment hint meaningless with fixed mmap");
2555
2556 if (fixed) {
2557 flags |= MAP_FIXED;
2558 } else if (alignment_hint > (size_t) vm_page_size()) {
2559 flags |= MAP_ALIGN;
2560 addr = (char*) alignment_hint;
2561 }
2562
2563 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2564 // uncommitted page. Otherwise, the read/write might succeed if we
2565 // have enough swap space to back the physical page.
2566 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2567 }
2568
2569 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2570 size_t alignment_hint) {
2571 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2572 (requested_addr != NULL));
2573
2574 guarantee(requested_addr == NULL || requested_addr == addr,
2575 "OS failed to return requested mmap address.");
2576 return addr;
2577 }
2578
2579 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2580 assert(file_desc >= 0, "file_desc is not valid");
2581 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2582 if (result != NULL) {
2583 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2584 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2585 }
2586 }
2587 return result;
2588 }
2589
2590 // Reserve memory at an arbitrary address, only if that area is
2591 // available (and not reserved for something else).
2592
2593 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2594 const int max_tries = 10;
2595 char* base[max_tries];
2596 size_t size[max_tries];
2597
2598 // Solaris adds a gap between mmap'ed regions. The size of the gap
2599 // is dependent on the requested size and the MMU. Our initial gap
2600 // value here is just a guess and will be corrected later.
2601 bool had_top_overlap = false;
2602 bool have_adjusted_gap = false;
2603 size_t gap = 0x400000;
2604
2605 // Assert only that the size is a multiple of the page size, since
2606 // that's all that mmap requires, and since that's all we really know
2607 // about at this low abstraction level. If we need higher alignment,
2608 // we can either pass an alignment to this method or verify alignment
2609 // in one of the methods further up the call chain. See bug 5044738.
2610 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2611
2612 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2613 // Give it a try, if the kernel honors the hint we can return immediately.
2614 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2615
2616 volatile int err = errno;
2617 if (addr == requested_addr) {
2618 return addr;
2619 } else if (addr != NULL) {
2620 pd_unmap_memory(addr, bytes);
2621 }
2622
2623 if (log_is_enabled(Warning, os)) {
2624 char buf[256];
2625 buf[0] = '\0';
2626 if (addr == NULL) {
2627 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2628 }
2629 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2630 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2631 "%s", bytes, requested_addr, addr, buf);
2632 }
2633
2634 // Address hint method didn't work. Fall back to the old method.
2635 // In theory, once SNV becomes our oldest supported platform, this
2636 // code will no longer be needed.
2637 //
2638 // Repeatedly allocate blocks until the block is allocated at the
2639 // right spot. Give up after max_tries.
2640 int i;
2641 for (i = 0; i < max_tries; ++i) {
2642 base[i] = reserve_memory(bytes);
2643
2644 if (base[i] != NULL) {
2645 // Is this the block we wanted?
2646 if (base[i] == requested_addr) {
2647 size[i] = bytes;
2648 break;
2649 }
2650
2651 // check that the gap value is right
2652 if (had_top_overlap && !have_adjusted_gap) {
2653 size_t actual_gap = base[i-1] - base[i] - bytes;
2654 if (gap != actual_gap) {
2655 // adjust the gap value and retry the last 2 allocations
2656 assert(i > 0, "gap adjustment code problem");
2657 have_adjusted_gap = true; // adjust the gap only once, just in case
2658 gap = actual_gap;
2659 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2660 unmap_memory(base[i], bytes);
2661 unmap_memory(base[i-1], size[i-1]);
2662 i-=2;
2663 continue;
2664 }
2665 }
2666
2667 // Does this overlap the block we wanted? Give back the overlapped
2668 // parts and try again.
2669 //
2670 // There is still a bug in this code: if top_overlap == bytes,
2671 // the overlap is offset from requested region by the value of gap.
2672 // In this case giving back the overlapped part will not work,
2673 // because we'll give back the entire block at base[i] and
2674 // therefore the subsequent allocation will not generate a new gap.
2675 // This could be fixed with a new algorithm that used larger
2676 // or variable size chunks to find the requested region -
2677 // but such a change would introduce additional complications.
2678 // It's rare enough that the planets align for this bug,
2679 // so we'll just wait for a fix for 6204603/5003415 which
2680 // will provide a mmap flag to allow us to avoid this business.
2681
2682 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2683 if (top_overlap >= 0 && top_overlap < bytes) {
2684 had_top_overlap = true;
2685 unmap_memory(base[i], top_overlap);
2686 base[i] += top_overlap;
2687 size[i] = bytes - top_overlap;
2688 } else {
2689 size_t bottom_overlap = base[i] + bytes - requested_addr;
2690 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2691 if (bottom_overlap == 0) {
2692 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2693 }
2694 unmap_memory(requested_addr, bottom_overlap);
2695 size[i] = bytes - bottom_overlap;
2696 } else {
2697 size[i] = bytes;
2698 }
2699 }
2700 }
2701 }
2702
2703 // Give back the unused reserved pieces.
2704
2705 for (int j = 0; j < i; ++j) {
2706 if (base[j] != NULL) {
2707 unmap_memory(base[j], size[j]);
2708 }
2709 }
2710
2711 return (i < max_tries) ? requested_addr : NULL;
2712 }
2713
2714 bool os::pd_release_memory(char* addr, size_t bytes) {
2715 size_t size = bytes;
2716 return munmap(addr, size) == 0;
2717 }
2718
2719 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2720 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2721 "addr must be page aligned");
2722 int retVal = mprotect(addr, bytes, prot);
2723 return retVal == 0;
2724 }
2725
2726 // Protect memory (Used to pass readonly pages through
2727 // JNI GetArray<type>Elements with empty arrays.)
2728 // Also, used for serialization page and for compressed oops null pointer
2729 // checking.
2730 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2731 bool is_committed) {
2732 unsigned int p = 0;
2733 switch (prot) {
2734 case MEM_PROT_NONE: p = PROT_NONE; break;
2735 case MEM_PROT_READ: p = PROT_READ; break;
2736 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2737 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2738 default:
2739 ShouldNotReachHere();
2740 }
2741 // is_committed is unused.
2742 return solaris_mprotect(addr, bytes, p);
2743 }
2744
2745 // guard_memory and unguard_memory only happens within stack guard pages.
2746 // Since ISM pertains only to the heap, guard and unguard memory should not
2747 /// happen with an ISM region.
2748 bool os::guard_memory(char* addr, size_t bytes) {
2749 return solaris_mprotect(addr, bytes, PROT_NONE);
2750 }
2751
2752 bool os::unguard_memory(char* addr, size_t bytes) {
2753 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2754 }
2755
2756 // Large page support
2757 static size_t _large_page_size = 0;
2758
2759 // Insertion sort for small arrays (descending order).
2760 static void insertion_sort_descending(size_t* array, int len) {
2761 for (int i = 0; i < len; i++) {
2762 size_t val = array[i];
2763 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2764 size_t tmp = array[key];
2765 array[key] = array[key - 1];
2766 array[key - 1] = tmp;
2767 }
2768 }
2769 }
2770
2771 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2772 const unsigned int usable_count = VM_Version::page_size_count();
2773 if (usable_count == 1) {
2774 return false;
2775 }
2776
2777 // Find the right getpagesizes interface. When solaris 11 is the minimum
2778 // build platform, getpagesizes() (without the '2') can be called directly.
2779 typedef int (*gps_t)(size_t[], int);
2780 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2781 if (gps_func == NULL) {
2782 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2783 if (gps_func == NULL) {
2784 if (warn) {
2785 warning("MPSS is not supported by the operating system.");
2786 }
2787 return false;
2788 }
2789 }
2790
2791 // Fill the array of page sizes.
2792 int n = (*gps_func)(_page_sizes, page_sizes_max);
2793 assert(n > 0, "Solaris bug?");
2794
2795 if (n == page_sizes_max) {
2796 // Add a sentinel value (necessary only if the array was completely filled
2797 // since it is static (zeroed at initialization)).
2798 _page_sizes[--n] = 0;
2799 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2800 }
2801 assert(_page_sizes[n] == 0, "missing sentinel");
2802 trace_page_sizes("available page sizes", _page_sizes, n);
2803
2804 if (n == 1) return false; // Only one page size available.
2805
2806 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2807 // select up to usable_count elements. First sort the array, find the first
2808 // acceptable value, then copy the usable sizes to the top of the array and
2809 // trim the rest. Make sure to include the default page size :-).
2810 //
2811 // A better policy could get rid of the 4M limit by taking the sizes of the
2812 // important VM memory regions (java heap and possibly the code cache) into
2813 // account.
2814 insertion_sort_descending(_page_sizes, n);
2815 const size_t size_limit =
2816 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2817 int beg;
2818 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2819 const int end = MIN2((int)usable_count, n) - 1;
2820 for (int cur = 0; cur < end; ++cur, ++beg) {
2821 _page_sizes[cur] = _page_sizes[beg];
2822 }
2823 _page_sizes[end] = vm_page_size();
2824 _page_sizes[end + 1] = 0;
2825
2826 if (_page_sizes[end] > _page_sizes[end - 1]) {
2827 // Default page size is not the smallest; sort again.
2828 insertion_sort_descending(_page_sizes, end + 1);
2829 }
2830 *page_size = _page_sizes[0];
2831
2832 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2833 return true;
2834 }
2835
2836 void os::large_page_init() {
2837 if (UseLargePages) {
2838 // print a warning if any large page related flag is specified on command line
2839 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2840 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2841
2842 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2843 }
2844 }
2845
2846 bool os::Solaris::is_valid_page_size(size_t bytes) {
2847 for (int i = 0; _page_sizes[i] != 0; i++) {
2848 if (_page_sizes[i] == bytes) {
2849 return true;
2850 }
2851 }
2852 return false;
2853 }
2854
2855 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2856 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2857 assert(is_aligned((void*) start, align),
2858 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2859 assert(is_aligned(bytes, align),
2860 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2861
2862 // Signal to OS that we want large pages for addresses
2863 // from addr, addr + bytes
2864 struct memcntl_mha mpss_struct;
2865 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2866 mpss_struct.mha_pagesize = align;
2867 mpss_struct.mha_flags = 0;
2868 // Upon successful completion, memcntl() returns 0
2869 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2870 debug_only(warning("Attempt to use MPSS failed."));
2871 return false;
2872 }
2873 return true;
2874 }
2875
2876 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2877 fatal("os::reserve_memory_special should not be called on Solaris.");
2878 return NULL;
2879 }
2880
2881 bool os::release_memory_special(char* base, size_t bytes) {
2882 fatal("os::release_memory_special should not be called on Solaris.");
2883 return false;
2884 }
2885
2886 size_t os::large_page_size() {
2887 return _large_page_size;
2888 }
2889
2890 // MPSS allows application to commit large page memory on demand; with ISM
2891 // the entire memory region must be allocated as shared memory.
2892 bool os::can_commit_large_page_memory() {
2893 return true;
2894 }
2895
2896 bool os::can_execute_large_page_memory() {
2897 return true;
2898 }
2899
2900 // Read calls from inside the vm need to perform state transitions
2901 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2902 size_t res;
2903 JavaThread* thread = (JavaThread*)Thread::current();
2904 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2905 ThreadBlockInVM tbiv(thread);
2906 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2907 return res;
2908 }
2909
2910 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2911 size_t res;
2912 JavaThread* thread = (JavaThread*)Thread::current();
2913 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2914 ThreadBlockInVM tbiv(thread);
2915 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
2916 return res;
2917 }
2918
2919 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
2920 size_t res;
2921 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
2922 "Assumed _thread_in_native");
2923 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2924 return res;
2925 }
2926
2927 void os::naked_short_sleep(jlong ms) {
2928 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2929
2930 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
2931 // Solaris requires -lrt for this.
2932 usleep((ms * 1000));
2933
2934 return;
2935 }
2936
2937 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2938 void os::infinite_sleep() {
2939 while (true) { // sleep forever ...
2940 ::sleep(100); // ... 100 seconds at a time
2941 }
2942 }
2943
2944 // Used to convert frequent JVM_Yield() to nops
2945 bool os::dont_yield() {
2946 if (DontYieldALot) {
2947 static hrtime_t last_time = 0;
2948 hrtime_t diff = getTimeNanos() - last_time;
2949
2950 if (diff < DontYieldALotInterval * 1000000) {
2951 return true;
2952 }
2953
2954 last_time += diff;
2955
2956 return false;
2957 } else {
2958 return false;
2959 }
2960 }
2961
2962 // Note that yield semantics are defined by the scheduling class to which
2963 // the thread currently belongs. Typically, yield will _not yield to
2964 // other equal or higher priority threads that reside on the dispatch queues
2965 // of other CPUs.
2966
2967 void os::naked_yield() {
2968 thr_yield();
2969 }
2970
2971 // Interface for setting lwp priorities. We are using T2 libthread,
2972 // which forces the use of bound threads, so all of our threads will
2973 // be assigned to real lwp's. Using the thr_setprio function is
2974 // meaningless in this mode so we must adjust the real lwp's priority.
2975 // The routines below implement the getting and setting of lwp priorities.
2976 //
2977 // Note: There are three priority scales used on Solaris. Java priotities
2978 // which range from 1 to 10, libthread "thr_setprio" scale which range
2979 // from 0 to 127, and the current scheduling class of the process we
2980 // are running in. This is typically from -60 to +60.
2981 // The setting of the lwp priorities in done after a call to thr_setprio
2982 // so Java priorities are mapped to libthread priorities and we map from
2983 // the latter to lwp priorities. We don't keep priorities stored in
2984 // Java priorities since some of our worker threads want to set priorities
2985 // higher than all Java threads.
2986 //
2987 // For related information:
2988 // (1) man -s 2 priocntl
2989 // (2) man -s 4 priocntl
2990 // (3) man dispadmin
2991 // = librt.so
2992 // = libthread/common/rtsched.c - thrp_setlwpprio().
2993 // = ps -cL <pid> ... to validate priority.
2994 // = sched_get_priority_min and _max
2995 // pthread_create
2996 // sched_setparam
2997 // pthread_setschedparam
2998 //
2999 // Assumptions:
3000 // + We assume that all threads in the process belong to the same
3001 // scheduling class. IE. an homogenous process.
3002 // + Must be root or in IA group to change change "interactive" attribute.
3003 // Priocntl() will fail silently. The only indication of failure is when
3004 // we read-back the value and notice that it hasn't changed.
3005 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3006 // + For RT, change timeslice as well. Invariant:
3007 // constant "priority integral"
3008 // Konst == TimeSlice * (60-Priority)
3009 // Given a priority, compute appropriate timeslice.
3010 // + Higher numerical values have higher priority.
3011
3012 // sched class attributes
3013 typedef struct {
3014 int schedPolicy; // classID
3015 int maxPrio;
3016 int minPrio;
3017 } SchedInfo;
3018
3019
3020 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3021
3022 #ifdef ASSERT
3023 static int ReadBackValidate = 1;
3024 #endif
3025 static int myClass = 0;
3026 static int myMin = 0;
3027 static int myMax = 0;
3028 static int myCur = 0;
3029 static bool priocntl_enable = false;
3030
3031 static const int criticalPrio = FXCriticalPriority;
3032 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3033
3034
3035 // lwp_priocntl_init
3036 //
3037 // Try to determine the priority scale for our process.
3038 //
3039 // Return errno or 0 if OK.
3040 //
3041 static int lwp_priocntl_init() {
3042 int rslt;
3043 pcinfo_t ClassInfo;
3044 pcparms_t ParmInfo;
3045 int i;
3046
3047 if (!UseThreadPriorities) return 0;
3048
3049 // If ThreadPriorityPolicy is 1, switch tables
3050 if (ThreadPriorityPolicy == 1) {
3051 for (i = 0; i < CriticalPriority+1; i++)
3052 os::java_to_os_priority[i] = prio_policy1[i];
3053 }
3054 if (UseCriticalJavaThreadPriority) {
3055 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3056 // See set_native_priority() and set_lwp_class_and_priority().
3057 // Save original MaxPriority mapping in case attempt to
3058 // use critical priority fails.
3059 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3060 // Set negative to distinguish from other priorities
3061 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3062 }
3063
3064 // Get IDs for a set of well-known scheduling classes.
3065 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3066 // the system. We should have a loop that iterates over the
3067 // classID values, which are known to be "small" integers.
3068
3069 strcpy(ClassInfo.pc_clname, "TS");
3070 ClassInfo.pc_cid = -1;
3071 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3072 if (rslt < 0) return errno;
3073 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3074 tsLimits.schedPolicy = ClassInfo.pc_cid;
3075 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3076 tsLimits.minPrio = -tsLimits.maxPrio;
3077
3078 strcpy(ClassInfo.pc_clname, "IA");
3079 ClassInfo.pc_cid = -1;
3080 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3081 if (rslt < 0) return errno;
3082 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3083 iaLimits.schedPolicy = ClassInfo.pc_cid;
3084 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3085 iaLimits.minPrio = -iaLimits.maxPrio;
3086
3087 strcpy(ClassInfo.pc_clname, "RT");
3088 ClassInfo.pc_cid = -1;
3089 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3090 if (rslt < 0) return errno;
3091 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3092 rtLimits.schedPolicy = ClassInfo.pc_cid;
3093 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3094 rtLimits.minPrio = 0;
3095
3096 strcpy(ClassInfo.pc_clname, "FX");
3097 ClassInfo.pc_cid = -1;
3098 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3099 if (rslt < 0) return errno;
3100 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3101 fxLimits.schedPolicy = ClassInfo.pc_cid;
3102 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3103 fxLimits.minPrio = 0;
3104
3105 // Query our "current" scheduling class.
3106 // This will normally be IA, TS or, rarely, FX or RT.
3107 memset(&ParmInfo, 0, sizeof(ParmInfo));
3108 ParmInfo.pc_cid = PC_CLNULL;
3109 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3110 if (rslt < 0) return errno;
3111 myClass = ParmInfo.pc_cid;
3112
3113 // We now know our scheduling classId, get specific information
3114 // about the class.
3115 ClassInfo.pc_cid = myClass;
3116 ClassInfo.pc_clname[0] = 0;
3117 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3118 if (rslt < 0) return errno;
3119
3120 if (ThreadPriorityVerbose) {
3121 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3122 }
3123
3124 memset(&ParmInfo, 0, sizeof(pcparms_t));
3125 ParmInfo.pc_cid = PC_CLNULL;
3126 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3127 if (rslt < 0) return errno;
3128
3129 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3130 myMin = rtLimits.minPrio;
3131 myMax = rtLimits.maxPrio;
3132 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3133 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3134 myMin = iaLimits.minPrio;
3135 myMax = iaLimits.maxPrio;
3136 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3137 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3138 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3139 myMin = tsLimits.minPrio;
3140 myMax = tsLimits.maxPrio;
3141 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3142 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3143 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3144 myMin = fxLimits.minPrio;
3145 myMax = fxLimits.maxPrio;
3146 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3147 } else {
3148 // No clue - punt
3149 if (ThreadPriorityVerbose) {
3150 tty->print_cr("Unknown scheduling class: %s ... \n",
3151 ClassInfo.pc_clname);
3152 }
3153 return EINVAL; // no clue, punt
3154 }
3155
3156 if (ThreadPriorityVerbose) {
3157 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3158 }
3159
3160 priocntl_enable = true; // Enable changing priorities
3161 return 0;
3162 }
3163
3164 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3165 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3166 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3167 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3168
3169
3170 // scale_to_lwp_priority
3171 //
3172 // Convert from the libthread "thr_setprio" scale to our current
3173 // lwp scheduling class scale.
3174 //
3175 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3176 int v;
3177
3178 if (x == 127) return rMax; // avoid round-down
3179 v = (((x*(rMax-rMin)))/128)+rMin;
3180 return v;
3181 }
3182
3183
3184 // set_lwp_class_and_priority
3185 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3186 int newPrio, int new_class, bool scale) {
3187 int rslt;
3188 int Actual, Expected, prv;
3189 pcparms_t ParmInfo; // for GET-SET
3190 #ifdef ASSERT
3191 pcparms_t ReadBack; // for readback
3192 #endif
3193
3194 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3195 // Query current values.
3196 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3197 // Cache "pcparms_t" in global ParmCache.
3198 // TODO: elide set-to-same-value
3199
3200 // If something went wrong on init, don't change priorities.
3201 if (!priocntl_enable) {
3202 if (ThreadPriorityVerbose) {
3203 tty->print_cr("Trying to set priority but init failed, ignoring");
3204 }
3205 return EINVAL;
3206 }
3207
3208 // If lwp hasn't started yet, just return
3209 // the _start routine will call us again.
3210 if (lwpid <= 0) {
3211 if (ThreadPriorityVerbose) {
3212 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3213 INTPTR_FORMAT " to %d, lwpid not set",
3214 ThreadID, newPrio);
3215 }
3216 return 0;
3217 }
3218
3219 if (ThreadPriorityVerbose) {
3220 tty->print_cr ("set_lwp_class_and_priority("
3221 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3222 ThreadID, lwpid, newPrio);
3223 }
3224
3225 memset(&ParmInfo, 0, sizeof(pcparms_t));
3226 ParmInfo.pc_cid = PC_CLNULL;
3227 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3228 if (rslt < 0) return errno;
3229
3230 int cur_class = ParmInfo.pc_cid;
3231 ParmInfo.pc_cid = (id_t)new_class;
3232
3233 if (new_class == rtLimits.schedPolicy) {
3234 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3235 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3236 rtLimits.maxPrio, newPrio)
3237 : newPrio;
3238 rtInfo->rt_tqsecs = RT_NOCHANGE;
3239 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3240 if (ThreadPriorityVerbose) {
3241 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3242 }
3243 } else if (new_class == iaLimits.schedPolicy) {
3244 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3245 int maxClamped = MIN2(iaLimits.maxPrio,
3246 cur_class == new_class
3247 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3248 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3249 maxClamped, newPrio)
3250 : newPrio;
3251 iaInfo->ia_uprilim = cur_class == new_class
3252 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3253 iaInfo->ia_mode = IA_NOCHANGE;
3254 if (ThreadPriorityVerbose) {
3255 tty->print_cr("IA: [%d...%d] %d->%d\n",
3256 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3257 }
3258 } else if (new_class == tsLimits.schedPolicy) {
3259 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3260 int maxClamped = MIN2(tsLimits.maxPrio,
3261 cur_class == new_class
3262 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3263 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3264 maxClamped, newPrio)
3265 : newPrio;
3266 tsInfo->ts_uprilim = cur_class == new_class
3267 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3268 if (ThreadPriorityVerbose) {
3269 tty->print_cr("TS: [%d...%d] %d->%d\n",
3270 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3271 }
3272 } else if (new_class == fxLimits.schedPolicy) {
3273 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3274 int maxClamped = MIN2(fxLimits.maxPrio,
3275 cur_class == new_class
3276 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3277 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3278 maxClamped, newPrio)
3279 : newPrio;
3280 fxInfo->fx_uprilim = cur_class == new_class
3281 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3282 fxInfo->fx_tqsecs = FX_NOCHANGE;
3283 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3284 if (ThreadPriorityVerbose) {
3285 tty->print_cr("FX: [%d...%d] %d->%d\n",
3286 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3287 }
3288 } else {
3289 if (ThreadPriorityVerbose) {
3290 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3291 }
3292 return EINVAL; // no clue, punt
3293 }
3294
3295 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3296 if (ThreadPriorityVerbose && rslt) {
3297 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3298 }
3299 if (rslt < 0) return errno;
3300
3301 #ifdef ASSERT
3302 // Sanity check: read back what we just attempted to set.
3303 // In theory it could have changed in the interim ...
3304 //
3305 // The priocntl system call is tricky.
3306 // Sometimes it'll validate the priority value argument and
3307 // return EINVAL if unhappy. At other times it fails silently.
3308 // Readbacks are prudent.
3309
3310 if (!ReadBackValidate) return 0;
3311
3312 memset(&ReadBack, 0, sizeof(pcparms_t));
3313 ReadBack.pc_cid = PC_CLNULL;
3314 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3315 assert(rslt >= 0, "priocntl failed");
3316 Actual = Expected = 0xBAD;
3317 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3318 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3319 Actual = RTPRI(ReadBack)->rt_pri;
3320 Expected = RTPRI(ParmInfo)->rt_pri;
3321 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3322 Actual = IAPRI(ReadBack)->ia_upri;
3323 Expected = IAPRI(ParmInfo)->ia_upri;
3324 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3325 Actual = TSPRI(ReadBack)->ts_upri;
3326 Expected = TSPRI(ParmInfo)->ts_upri;
3327 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3328 Actual = FXPRI(ReadBack)->fx_upri;
3329 Expected = FXPRI(ParmInfo)->fx_upri;
3330 } else {
3331 if (ThreadPriorityVerbose) {
3332 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3333 ParmInfo.pc_cid);
3334 }
3335 }
3336
3337 if (Actual != Expected) {
3338 if (ThreadPriorityVerbose) {
3339 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3340 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3341 }
3342 }
3343 #endif
3344
3345 return 0;
3346 }
3347
3348 // Solaris only gives access to 128 real priorities at a time,
3349 // so we expand Java's ten to fill this range. This would be better
3350 // if we dynamically adjusted relative priorities.
3351 //
3352 // The ThreadPriorityPolicy option allows us to select 2 different
3353 // priority scales.
3354 //
3355 // ThreadPriorityPolicy=0
3356 // Since the Solaris' default priority is MaximumPriority, we do not
3357 // set a priority lower than Max unless a priority lower than
3358 // NormPriority is requested.
3359 //
3360 // ThreadPriorityPolicy=1
3361 // This mode causes the priority table to get filled with
3362 // linear values. NormPriority get's mapped to 50% of the
3363 // Maximum priority an so on. This will cause VM threads
3364 // to get unfair treatment against other Solaris processes
3365 // which do not explicitly alter their thread priorities.
3366
3367 int os::java_to_os_priority[CriticalPriority + 1] = {
3368 -99999, // 0 Entry should never be used
3369
3370 0, // 1 MinPriority
3371 32, // 2
3372 64, // 3
3373
3374 96, // 4
3375 127, // 5 NormPriority
3376 127, // 6
3377
3378 127, // 7
3379 127, // 8
3380 127, // 9 NearMaxPriority
3381
3382 127, // 10 MaxPriority
3383
3384 -criticalPrio // 11 CriticalPriority
3385 };
3386
3387 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3388 OSThread* osthread = thread->osthread();
3389
3390 // Save requested priority in case the thread hasn't been started
3391 osthread->set_native_priority(newpri);
3392
3393 // Check for critical priority request
3394 bool fxcritical = false;
3395 if (newpri == -criticalPrio) {
3396 fxcritical = true;
3397 newpri = criticalPrio;
3398 }
3399
3400 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3401 if (!UseThreadPriorities) return OS_OK;
3402
3403 int status = 0;
3404
3405 if (!fxcritical) {
3406 // Use thr_setprio only if we have a priority that thr_setprio understands
3407 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3408 }
3409
3410 int lwp_status =
3411 set_lwp_class_and_priority(osthread->thread_id(),
3412 osthread->lwp_id(),
3413 newpri,
3414 fxcritical ? fxLimits.schedPolicy : myClass,
3415 !fxcritical);
3416 if (lwp_status != 0 && fxcritical) {
3417 // Try again, this time without changing the scheduling class
3418 newpri = java_MaxPriority_to_os_priority;
3419 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3420 osthread->lwp_id(),
3421 newpri, myClass, false);
3422 }
3423 status |= lwp_status;
3424 return (status == 0) ? OS_OK : OS_ERR;
3425 }
3426
3427
3428 OSReturn os::get_native_priority(const Thread* const thread,
3429 int *priority_ptr) {
3430 int p;
3431 if (!UseThreadPriorities) {
3432 *priority_ptr = NormalPriority;
3433 return OS_OK;
3434 }
3435 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3436 if (status != 0) {
3437 return OS_ERR;
3438 }
3439 *priority_ptr = p;
3440 return OS_OK;
3441 }
3442
3443
3444 // Hint to the underlying OS that a task switch would not be good.
3445 // Void return because it's a hint and can fail.
3446 void os::hint_no_preempt() {
3447 schedctl_start(schedctl_init());
3448 }
3449
3450 ////////////////////////////////////////////////////////////////////////////////
3451 // suspend/resume support
3452
3453 // The low-level signal-based suspend/resume support is a remnant from the
3454 // old VM-suspension that used to be for java-suspension, safepoints etc,
3455 // within hotspot. Currently used by JFR's OSThreadSampler
3456 //
3457 // The remaining code is greatly simplified from the more general suspension
3458 // code that used to be used.
3459 //
3460 // The protocol is quite simple:
3461 // - suspend:
3462 // - sends a signal to the target thread
3463 // - polls the suspend state of the osthread using a yield loop
3464 // - target thread signal handler (SR_handler) sets suspend state
3465 // and blocks in sigsuspend until continued
3466 // - resume:
3467 // - sets target osthread state to continue
3468 // - sends signal to end the sigsuspend loop in the SR_handler
3469 //
3470 // Note that the SR_lock plays no role in this suspend/resume protocol,
3471 // but is checked for NULL in SR_handler as a thread termination indicator.
3472 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3473 //
3474 // Note that resume_clear_context() and suspend_save_context() are needed
3475 // by SR_handler(), so that fetch_frame_from_ucontext() works,
3476 // which in part is used by:
3477 // - Forte Analyzer: AsyncGetCallTrace()
3478 // - StackBanging: get_frame_at_stack_banging_point()
3479 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3480
3481 static void resume_clear_context(OSThread *osthread) {
3482 osthread->set_ucontext(NULL);
3483 }
3484
3485 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3486 osthread->set_ucontext(context);
3487 }
3488
3489 static PosixSemaphore sr_semaphore;
3490
3491 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3492 // Save and restore errno to avoid confusing native code with EINTR
3493 // after sigsuspend.
3494 int old_errno = errno;
3495
3496 OSThread* osthread = thread->osthread();
3497 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3498
3499 os::SuspendResume::State current = osthread->sr.state();
3500 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3501 suspend_save_context(osthread, context);
3502
3503 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3504 os::SuspendResume::State state = osthread->sr.suspended();
3505 if (state == os::SuspendResume::SR_SUSPENDED) {
3506 sigset_t suspend_set; // signals for sigsuspend()
3507
3508 // get current set of blocked signals and unblock resume signal
3509 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3510 sigdelset(&suspend_set, ASYNC_SIGNAL);
3511
3512 sr_semaphore.signal();
3513 // wait here until we are resumed
3514 while (1) {
3515 sigsuspend(&suspend_set);
3516
3517 os::SuspendResume::State result = osthread->sr.running();
3518 if (result == os::SuspendResume::SR_RUNNING) {
3519 sr_semaphore.signal();
3520 break;
3521 }
3522 }
3523
3524 } else if (state == os::SuspendResume::SR_RUNNING) {
3525 // request was cancelled, continue
3526 } else {
3527 ShouldNotReachHere();
3528 }
3529
3530 resume_clear_context(osthread);
3531 } else if (current == os::SuspendResume::SR_RUNNING) {
3532 // request was cancelled, continue
3533 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3534 // ignore
3535 } else {
3536 // ignore
3537 }
3538
3539 errno = old_errno;
3540 }
3541
3542 void os::print_statistics() {
3543 }
3544
3545 bool os::message_box(const char* title, const char* message) {
3546 int i;
3547 fdStream err(defaultStream::error_fd());
3548 for (i = 0; i < 78; i++) err.print_raw("=");
3549 err.cr();
3550 err.print_raw_cr(title);
3551 for (i = 0; i < 78; i++) err.print_raw("-");
3552 err.cr();
3553 err.print_raw_cr(message);
3554 for (i = 0; i < 78; i++) err.print_raw("=");
3555 err.cr();
3556
3557 char buf[16];
3558 // Prevent process from exiting upon "read error" without consuming all CPU
3559 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3560
3561 return buf[0] == 'y' || buf[0] == 'Y';
3562 }
3563
3564 static int sr_notify(OSThread* osthread) {
3565 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3566 assert_status(status == 0, status, "thr_kill");
3567 return status;
3568 }
3569
3570 // "Randomly" selected value for how long we want to spin
3571 // before bailing out on suspending a thread, also how often
3572 // we send a signal to a thread we want to resume
3573 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3574 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3575
3576 static bool do_suspend(OSThread* osthread) {
3577 assert(osthread->sr.is_running(), "thread should be running");
3578 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3579
3580 // mark as suspended and send signal
3581 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3582 // failed to switch, state wasn't running?
3583 ShouldNotReachHere();
3584 return false;
3585 }
3586
3587 if (sr_notify(osthread) != 0) {
3588 ShouldNotReachHere();
3589 }
3590
3591 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3592 while (true) {
3593 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2000 * NANOSECS_PER_MILLISEC))) {
3594 break;
3595 } else {
3596 // timeout
3597 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3598 if (cancelled == os::SuspendResume::SR_RUNNING) {
3599 return false;
3600 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3601 // make sure that we consume the signal on the semaphore as well
3602 sr_semaphore.wait();
3603 break;
3604 } else {
3605 ShouldNotReachHere();
3606 return false;
3607 }
3608 }
3609 }
3610
3611 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3612 return true;
3613 }
3614
3615 static void do_resume(OSThread* osthread) {
3616 assert(osthread->sr.is_suspended(), "thread should be suspended");
3617 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3618
3619 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3620 // failed to switch to WAKEUP_REQUEST
3621 ShouldNotReachHere();
3622 return;
3623 }
3624
3625 while (true) {
3626 if (sr_notify(osthread) == 0) {
3627 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) {
3628 if (osthread->sr.is_running()) {
3629 return;
3630 }
3631 }
3632 } else {
3633 ShouldNotReachHere();
3634 }
3635 }
3636
3637 guarantee(osthread->sr.is_running(), "Must be running!");
3638 }
3639
3640 void os::SuspendedThreadTask::internal_do_task() {
3641 if (do_suspend(_thread->osthread())) {
3642 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3643 do_task(context);
3644 do_resume(_thread->osthread());
3645 }
3646 }
3647
3648 // This does not do anything on Solaris. This is basically a hook for being
3649 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3650 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3651 const methodHandle& method, JavaCallArguments* args,
3652 Thread* thread) {
3653 f(value, method, args, thread);
3654 }
3655
3656 // This routine may be used by user applications as a "hook" to catch signals.
3657 // The user-defined signal handler must pass unrecognized signals to this
3658 // routine, and if it returns true (non-zero), then the signal handler must
3659 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3660 // routine will never retun false (zero), but instead will execute a VM panic
3661 // routine kill the process.
3662 //
3663 // If this routine returns false, it is OK to call it again. This allows
3664 // the user-defined signal handler to perform checks either before or after
3665 // the VM performs its own checks. Naturally, the user code would be making
3666 // a serious error if it tried to handle an exception (such as a null check
3667 // or breakpoint) that the VM was generating for its own correct operation.
3668 //
3669 // This routine may recognize any of the following kinds of signals:
3670 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3671 // ASYNC_SIGNAL.
3672 // It should be consulted by handlers for any of those signals.
3673 //
3674 // The caller of this routine must pass in the three arguments supplied
3675 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3676 // field of the structure passed to sigaction(). This routine assumes that
3677 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3678 //
3679 // Note that the VM will print warnings if it detects conflicting signal
3680 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3681 //
3682 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3683 siginfo_t* siginfo,
3684 void* ucontext,
3685 int abort_if_unrecognized);
3686
3687
3688 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3689 int orig_errno = errno; // Preserve errno value over signal handler.
3690 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3691 errno = orig_errno;
3692 }
3693
3694 // This boolean allows users to forward their own non-matching signals
3695 // to JVM_handle_solaris_signal, harmlessly.
3696 bool os::Solaris::signal_handlers_are_installed = false;
3697
3698 // For signal-chaining
3699 bool os::Solaris::libjsig_is_loaded = false;
3700 typedef struct sigaction *(*get_signal_t)(int);
3701 get_signal_t os::Solaris::get_signal_action = NULL;
3702
3703 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3704 struct sigaction *actp = NULL;
3705
3706 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3707 // Retrieve the old signal handler from libjsig
3708 actp = (*get_signal_action)(sig);
3709 }
3710 if (actp == NULL) {
3711 // Retrieve the preinstalled signal handler from jvm
3712 actp = get_preinstalled_handler(sig);
3713 }
3714
3715 return actp;
3716 }
3717
3718 static bool call_chained_handler(struct sigaction *actp, int sig,
3719 siginfo_t *siginfo, void *context) {
3720 // Call the old signal handler
3721 if (actp->sa_handler == SIG_DFL) {
3722 // It's more reasonable to let jvm treat it as an unexpected exception
3723 // instead of taking the default action.
3724 return false;
3725 } else if (actp->sa_handler != SIG_IGN) {
3726 if ((actp->sa_flags & SA_NODEFER) == 0) {
3727 // automaticlly block the signal
3728 sigaddset(&(actp->sa_mask), sig);
3729 }
3730
3731 sa_handler_t hand;
3732 sa_sigaction_t sa;
3733 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3734 // retrieve the chained handler
3735 if (siginfo_flag_set) {
3736 sa = actp->sa_sigaction;
3737 } else {
3738 hand = actp->sa_handler;
3739 }
3740
3741 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3742 actp->sa_handler = SIG_DFL;
3743 }
3744
3745 // try to honor the signal mask
3746 sigset_t oset;
3747 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3748
3749 // call into the chained handler
3750 if (siginfo_flag_set) {
3751 (*sa)(sig, siginfo, context);
3752 } else {
3753 (*hand)(sig);
3754 }
3755
3756 // restore the signal mask
3757 pthread_sigmask(SIG_SETMASK, &oset, 0);
3758 }
3759 // Tell jvm's signal handler the signal is taken care of.
3760 return true;
3761 }
3762
3763 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3764 bool chained = false;
3765 // signal-chaining
3766 if (UseSignalChaining) {
3767 struct sigaction *actp = get_chained_signal_action(sig);
3768 if (actp != NULL) {
3769 chained = call_chained_handler(actp, sig, siginfo, context);
3770 }
3771 }
3772 return chained;
3773 }
3774
3775 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3776 assert((chainedsigactions != (struct sigaction *)NULL) &&
3777 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3778 if (preinstalled_sigs[sig] != 0) {
3779 return &chainedsigactions[sig];
3780 }
3781 return NULL;
3782 }
3783
3784 void os::Solaris::save_preinstalled_handler(int sig,
3785 struct sigaction& oldAct) {
3786 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3787 assert((chainedsigactions != (struct sigaction *)NULL) &&
3788 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3789 chainedsigactions[sig] = oldAct;
3790 preinstalled_sigs[sig] = 1;
3791 }
3792
3793 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3794 bool oktochain) {
3795 // Check for overwrite.
3796 struct sigaction oldAct;
3797 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3798 void* oldhand =
3799 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3800 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3801 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3802 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3803 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3804 if (AllowUserSignalHandlers || !set_installed) {
3805 // Do not overwrite; user takes responsibility to forward to us.
3806 return;
3807 } else if (UseSignalChaining) {
3808 if (oktochain) {
3809 // save the old handler in jvm
3810 save_preinstalled_handler(sig, oldAct);
3811 } else {
3812 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3813 }
3814 // libjsig also interposes the sigaction() call below and saves the
3815 // old sigaction on it own.
3816 } else {
3817 fatal("Encountered unexpected pre-existing sigaction handler "
3818 "%#lx for signal %d.", (long)oldhand, sig);
3819 }
3820 }
3821
3822 struct sigaction sigAct;
3823 sigfillset(&(sigAct.sa_mask));
3824 sigAct.sa_handler = SIG_DFL;
3825
3826 sigAct.sa_sigaction = signalHandler;
3827 // Handle SIGSEGV on alternate signal stack if
3828 // not using stack banging
3829 if (!UseStackBanging && sig == SIGSEGV) {
3830 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3831 } else {
3832 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3833 }
3834 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3835
3836 sigaction(sig, &sigAct, &oldAct);
3837
3838 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3839 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3840 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3841 }
3842
3843
3844 #define DO_SIGNAL_CHECK(sig) \
3845 do { \
3846 if (!sigismember(&check_signal_done, sig)) { \
3847 os::Solaris::check_signal_handler(sig); \
3848 } \
3849 } while (0)
3850
3851 // This method is a periodic task to check for misbehaving JNI applications
3852 // under CheckJNI, we can add any periodic checks here
3853
3854 void os::run_periodic_checks() {
3855 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3856 // thereby preventing a NULL checks.
3857 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3858
3859 if (check_signals == false) return;
3860
3861 // SEGV and BUS if overridden could potentially prevent
3862 // generation of hs*.log in the event of a crash, debugging
3863 // such a case can be very challenging, so we absolutely
3864 // check for the following for a good measure:
3865 DO_SIGNAL_CHECK(SIGSEGV);
3866 DO_SIGNAL_CHECK(SIGILL);
3867 DO_SIGNAL_CHECK(SIGFPE);
3868 DO_SIGNAL_CHECK(SIGBUS);
3869 DO_SIGNAL_CHECK(SIGPIPE);
3870 DO_SIGNAL_CHECK(SIGXFSZ);
3871 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3872
3873 // ReduceSignalUsage allows the user to override these handlers
3874 // see comments at the very top and jvm_solaris.h
3875 if (!ReduceSignalUsage) {
3876 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3877 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3878 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3879 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3880 }
3881 }
3882
3883 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3884
3885 static os_sigaction_t os_sigaction = NULL;
3886
3887 void os::Solaris::check_signal_handler(int sig) {
3888 char buf[O_BUFLEN];
3889 address jvmHandler = NULL;
3890
3891 struct sigaction act;
3892 if (os_sigaction == NULL) {
3893 // only trust the default sigaction, in case it has been interposed
3894 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3895 if (os_sigaction == NULL) return;
3896 }
3897
3898 os_sigaction(sig, (struct sigaction*)NULL, &act);
3899
3900 address thisHandler = (act.sa_flags & SA_SIGINFO)
3901 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3902 : CAST_FROM_FN_PTR(address, act.sa_handler);
3903
3904
3905 switch (sig) {
3906 case SIGSEGV:
3907 case SIGBUS:
3908 case SIGFPE:
3909 case SIGPIPE:
3910 case SIGXFSZ:
3911 case SIGILL:
3912 case ASYNC_SIGNAL:
3913 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3914 break;
3915
3916 case SHUTDOWN1_SIGNAL:
3917 case SHUTDOWN2_SIGNAL:
3918 case SHUTDOWN3_SIGNAL:
3919 case BREAK_SIGNAL:
3920 jvmHandler = (address)user_handler();
3921 break;
3922
3923 default:
3924 return;
3925 }
3926
3927 if (thisHandler != jvmHandler) {
3928 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3929 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3930 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3931 // No need to check this sig any longer
3932 sigaddset(&check_signal_done, sig);
3933 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3934 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3935 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3936 exception_name(sig, buf, O_BUFLEN));
3937 }
3938 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3939 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3940 tty->print("expected:");
3941 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3942 tty->cr();
3943 tty->print(" found:");
3944 os::Posix::print_sa_flags(tty, act.sa_flags);
3945 tty->cr();
3946 // No need to check this sig any longer
3947 sigaddset(&check_signal_done, sig);
3948 }
3949
3950 // Print all the signal handler state
3951 if (sigismember(&check_signal_done, sig)) {
3952 print_signal_handlers(tty, buf, O_BUFLEN);
3953 }
3954
3955 }
3956
3957 void os::Solaris::install_signal_handlers() {
3958 signal_handlers_are_installed = true;
3959
3960 // signal-chaining
3961 typedef void (*signal_setting_t)();
3962 signal_setting_t begin_signal_setting = NULL;
3963 signal_setting_t end_signal_setting = NULL;
3964 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3965 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3966 if (begin_signal_setting != NULL) {
3967 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3968 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3969 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3970 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3971 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
3972 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
3973 libjsig_is_loaded = true;
3974 if (os::Solaris::get_libjsig_version != NULL) {
3975 int libjsigversion = (*os::Solaris::get_libjsig_version)();
3976 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch");
3977 }
3978 assert(UseSignalChaining, "should enable signal-chaining");
3979 }
3980 if (libjsig_is_loaded) {
3981 // Tell libjsig jvm is setting signal handlers
3982 (*begin_signal_setting)();
3983 }
3984
3985 set_signal_handler(SIGSEGV, true, true);
3986 set_signal_handler(SIGPIPE, true, true);
3987 set_signal_handler(SIGXFSZ, true, true);
3988 set_signal_handler(SIGBUS, true, true);
3989 set_signal_handler(SIGILL, true, true);
3990 set_signal_handler(SIGFPE, true, true);
3991 set_signal_handler(ASYNC_SIGNAL, true, true);
3992
3993 if (libjsig_is_loaded) {
3994 // Tell libjsig jvm finishes setting signal handlers
3995 (*end_signal_setting)();
3996 }
3997
3998 // We don't activate signal checker if libjsig is in place, we trust ourselves
3999 // and if UserSignalHandler is installed all bets are off.
4000 // Log that signal checking is off only if -verbose:jni is specified.
4001 if (CheckJNICalls) {
4002 if (libjsig_is_loaded) {
4003 if (PrintJNIResolving) {
4004 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4005 }
4006 check_signals = false;
4007 }
4008 if (AllowUserSignalHandlers) {
4009 if (PrintJNIResolving) {
4010 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4011 }
4012 check_signals = false;
4013 }
4014 }
4015 }
4016
4017
4018 void report_error(const char* file_name, int line_no, const char* title,
4019 const char* format, ...);
4020
4021 // (Static) wrappers for the liblgrp API
4022 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4023 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4024 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4025 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4026 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4027 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4028 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4029 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4030 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4031
4032 static address resolve_symbol_lazy(const char* name) {
4033 address addr = (address) dlsym(RTLD_DEFAULT, name);
4034 if (addr == NULL) {
4035 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4036 addr = (address) dlsym(RTLD_NEXT, name);
4037 }
4038 return addr;
4039 }
4040
4041 static address resolve_symbol(const char* name) {
4042 address addr = resolve_symbol_lazy(name);
4043 if (addr == NULL) {
4044 fatal(dlerror());
4045 }
4046 return addr;
4047 }
4048
4049 void os::Solaris::libthread_init() {
4050 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4051
4052 lwp_priocntl_init();
4053
4054 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4055 if (func == NULL) {
4056 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4057 // Guarantee that this VM is running on an new enough OS (5.6 or
4058 // later) that it will have a new enough libthread.so.
4059 guarantee(func != NULL, "libthread.so is too old.");
4060 }
4061
4062 int size;
4063 void (*handler_info_func)(address *, int *);
4064 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4065 handler_info_func(&handler_start, &size);
4066 handler_end = handler_start + size;
4067 }
4068
4069
4070 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4071 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4072 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4073 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4074 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4075 int os::Solaris::_mutex_scope = USYNC_THREAD;
4076
4077 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4078 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4079 int_fnP_cond_tP os::Solaris::_cond_signal;
4080 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4081 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4082 int_fnP_cond_tP os::Solaris::_cond_destroy;
4083 int os::Solaris::_cond_scope = USYNC_THREAD;
4084 bool os::Solaris::_synchronization_initialized;
4085
4086 void os::Solaris::synchronization_init() {
4087 if (UseLWPSynchronization) {
4088 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4089 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4090 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4091 os::Solaris::set_mutex_init(lwp_mutex_init);
4092 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4093 os::Solaris::set_mutex_scope(USYNC_THREAD);
4094
4095 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4096 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4097 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4098 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4099 os::Solaris::set_cond_init(lwp_cond_init);
4100 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4101 os::Solaris::set_cond_scope(USYNC_THREAD);
4102 } else {
4103 os::Solaris::set_mutex_scope(USYNC_THREAD);
4104 os::Solaris::set_cond_scope(USYNC_THREAD);
4105
4106 if (UsePthreads) {
4107 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4108 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4109 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4110 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4111 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4112
4113 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4114 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4115 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4116 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4117 os::Solaris::set_cond_init(pthread_cond_default_init);
4118 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4119 } else {
4120 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4121 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4122 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4123 os::Solaris::set_mutex_init(::mutex_init);
4124 os::Solaris::set_mutex_destroy(::mutex_destroy);
4125
4126 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4127 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4128 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4129 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4130 os::Solaris::set_cond_init(::cond_init);
4131 os::Solaris::set_cond_destroy(::cond_destroy);
4132 }
4133 }
4134 _synchronization_initialized = true;
4135 }
4136
4137 bool os::Solaris::liblgrp_init() {
4138 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4139 if (handle != NULL) {
4140 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4141 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4142 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4143 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4144 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4145 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4146 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4147 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4148 dlsym(handle, "lgrp_cookie_stale")));
4149
4150 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4151 set_lgrp_cookie(c);
4152 return true;
4153 }
4154 return false;
4155 }
4156
4157 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4158 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4159 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4160
4161 void init_pset_getloadavg_ptr(void) {
4162 pset_getloadavg_ptr =
4163 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4164 if (pset_getloadavg_ptr == NULL) {
4165 log_warning(os)("pset_getloadavg function not found");
4166 }
4167 }
4168
4169 int os::Solaris::_dev_zero_fd = -1;
4170
4171 // this is called _before_ the global arguments have been parsed
4172 void os::init(void) {
4173 _initial_pid = getpid();
4174
4175 max_hrtime = first_hrtime = gethrtime();
4176
4177 init_random(1234567);
4178
4179 page_size = sysconf(_SC_PAGESIZE);
4180 if (page_size == -1) {
4181 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4182 }
4183 init_page_sizes((size_t) page_size);
4184
4185 Solaris::initialize_system_info();
4186
4187 int fd = ::open("/dev/zero", O_RDWR);
4188 if (fd < 0) {
4189 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4190 } else {
4191 Solaris::set_dev_zero_fd(fd);
4192
4193 // Close on exec, child won't inherit.
4194 fcntl(fd, F_SETFD, FD_CLOEXEC);
4195 }
4196
4197 clock_tics_per_sec = CLK_TCK;
4198
4199 // check if dladdr1() exists; dladdr1 can provide more information than
4200 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4201 // and is available on linker patches for 5.7 and 5.8.
4202 // libdl.so must have been loaded, this call is just an entry lookup
4203 void * hdl = dlopen("libdl.so", RTLD_NOW);
4204 if (hdl) {
4205 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4206 }
4207
4208 // main_thread points to the thread that created/loaded the JVM.
4209 main_thread = thr_self();
4210
4211 // dynamic lookup of functions that may not be available in our lowest
4212 // supported Solaris release
4213 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4214 if (handle != NULL) {
4215 Solaris::_pthread_setname_np = // from 11.3
4216 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4217 }
4218 }
4219
4220 // To install functions for atexit system call
4221 extern "C" {
4222 static void perfMemory_exit_helper() {
4223 perfMemory_exit();
4224 }
4225 }
4226
4227 // this is called _after_ the global arguments have been parsed
4228 jint os::init_2(void) {
4229 // try to enable extended file IO ASAP, see 6431278
4230 os::Solaris::try_enable_extended_io();
4231
4232 // Check and sets minimum stack sizes against command line options
4233 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4234 return JNI_ERR;
4235 }
4236
4237 Solaris::libthread_init();
4238
4239 if (UseNUMA) {
4240 if (!Solaris::liblgrp_init()) {
4241 UseNUMA = false;
4242 } else {
4243 size_t lgrp_limit = os::numa_get_groups_num();
4244 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4245 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4246 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4247 if (lgrp_num < 2) {
4248 // There's only one locality group, disable NUMA.
4249 UseNUMA = false;
4250 }
4251 }
4252 if (!UseNUMA && ForceNUMA) {
4253 UseNUMA = true;
4254 }
4255 }
4256
4257 Solaris::signal_sets_init();
4258 Solaris::init_signal_mem();
4259 Solaris::install_signal_handlers();
4260
4261 // initialize synchronization primitives to use either thread or
4262 // lwp synchronization (controlled by UseLWPSynchronization)
4263 Solaris::synchronization_init();
4264
4265 if (MaxFDLimit) {
4266 // set the number of file descriptors to max. print out error
4267 // if getrlimit/setrlimit fails but continue regardless.
4268 struct rlimit nbr_files;
4269 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4270 if (status != 0) {
4271 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4272 } else {
4273 nbr_files.rlim_cur = nbr_files.rlim_max;
4274 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4275 if (status != 0) {
4276 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4277 }
4278 }
4279 }
4280
4281 // Calculate theoretical max. size of Threads to guard gainst
4282 // artifical out-of-memory situations, where all available address-
4283 // space has been reserved by thread stacks. Default stack size is 1Mb.
4284 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4285 JavaThread::stack_size_at_create() : (1*K*K);
4286 assert(pre_thread_stack_size != 0, "Must have a stack");
4287 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4288 // we should start doing Virtual Memory banging. Currently when the threads will
4289 // have used all but 200Mb of space.
4290 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4291 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4292
4293 // at-exit methods are called in the reverse order of their registration.
4294 // In Solaris 7 and earlier, atexit functions are called on return from
4295 // main or as a result of a call to exit(3C). There can be only 32 of
4296 // these functions registered and atexit() does not set errno. In Solaris
4297 // 8 and later, there is no limit to the number of functions registered
4298 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4299 // functions are called upon dlclose(3DL) in addition to return from main
4300 // and exit(3C).
4301
4302 if (PerfAllowAtExitRegistration) {
4303 // only register atexit functions if PerfAllowAtExitRegistration is set.
4304 // atexit functions can be delayed until process exit time, which
4305 // can be problematic for embedded VM situations. Embedded VMs should
4306 // call DestroyJavaVM() to assure that VM resources are released.
4307
4308 // note: perfMemory_exit_helper atexit function may be removed in
4309 // the future if the appropriate cleanup code can be added to the
4310 // VM_Exit VMOperation's doit method.
4311 if (atexit(perfMemory_exit_helper) != 0) {
4312 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4313 }
4314 }
4315
4316 // Init pset_loadavg function pointer
4317 init_pset_getloadavg_ptr();
4318
4319 return JNI_OK;
4320 }
4321
4322 // Mark the polling page as unreadable
4323 void os::make_polling_page_unreadable(void) {
4324 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4325 fatal("Could not disable polling page");
4326 }
4327 }
4328
4329 // Mark the polling page as readable
4330 void os::make_polling_page_readable(void) {
4331 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4332 fatal("Could not enable polling page");
4333 }
4334 }
4335
4336 // Is a (classpath) directory empty?
4337 bool os::dir_is_empty(const char* path) {
4338 DIR *dir = NULL;
4339 struct dirent *ptr;
4340
4341 dir = opendir(path);
4342 if (dir == NULL) return true;
4343
4344 // Scan the directory
4345 bool result = true;
4346 char buf[sizeof(struct dirent) + MAX_PATH];
4347 struct dirent *dbuf = (struct dirent *) buf;
4348 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4349 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4350 result = false;
4351 }
4352 }
4353 closedir(dir);
4354 return result;
4355 }
4356
4357 // This code originates from JDK's sysOpen and open64_w
4358 // from src/solaris/hpi/src/system_md.c
4359
4360 int os::open(const char *path, int oflag, int mode) {
4361 if (strlen(path) > MAX_PATH - 1) {
4362 errno = ENAMETOOLONG;
4363 return -1;
4364 }
4365 int fd;
4366
4367 fd = ::open64(path, oflag, mode);
4368 if (fd == -1) return -1;
4369
4370 // If the open succeeded, the file might still be a directory
4371 {
4372 struct stat64 buf64;
4373 int ret = ::fstat64(fd, &buf64);
4374 int st_mode = buf64.st_mode;
4375
4376 if (ret != -1) {
4377 if ((st_mode & S_IFMT) == S_IFDIR) {
4378 errno = EISDIR;
4379 ::close(fd);
4380 return -1;
4381 }
4382 } else {
4383 ::close(fd);
4384 return -1;
4385 }
4386 }
4387
4388 // 32-bit Solaris systems suffer from:
4389 //
4390 // - an historical default soft limit of 256 per-process file
4391 // descriptors that is too low for many Java programs.
4392 //
4393 // - a design flaw where file descriptors created using stdio
4394 // fopen must be less than 256, _even_ when the first limit above
4395 // has been raised. This can cause calls to fopen (but not calls to
4396 // open, for example) to fail mysteriously, perhaps in 3rd party
4397 // native code (although the JDK itself uses fopen). One can hardly
4398 // criticize them for using this most standard of all functions.
4399 //
4400 // We attempt to make everything work anyways by:
4401 //
4402 // - raising the soft limit on per-process file descriptors beyond
4403 // 256
4404 //
4405 // - As of Solaris 10u4, we can request that Solaris raise the 256
4406 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4407 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4408 //
4409 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4410 // workaround the bug by remapping non-stdio file descriptors below
4411 // 256 to ones beyond 256, which is done below.
4412 //
4413 // See:
4414 // 1085341: 32-bit stdio routines should support file descriptors >255
4415 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4416 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4417 // enable_extended_FILE_stdio() in VM initialisation
4418 // Giri Mandalika's blog
4419 // http://technopark02.blogspot.com/2005_05_01_archive.html
4420 //
4421 #ifndef _LP64
4422 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4423 int newfd = ::fcntl(fd, F_DUPFD, 256);
4424 if (newfd != -1) {
4425 ::close(fd);
4426 fd = newfd;
4427 }
4428 }
4429 #endif // 32-bit Solaris
4430
4431 // All file descriptors that are opened in the JVM and not
4432 // specifically destined for a subprocess should have the
4433 // close-on-exec flag set. If we don't set it, then careless 3rd
4434 // party native code might fork and exec without closing all
4435 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4436 // UNIXProcess.c), and this in turn might:
4437 //
4438 // - cause end-of-file to fail to be detected on some file
4439 // descriptors, resulting in mysterious hangs, or
4440 //
4441 // - might cause an fopen in the subprocess to fail on a system
4442 // suffering from bug 1085341.
4443 //
4444 // (Yes, the default setting of the close-on-exec flag is a Unix
4445 // design flaw)
4446 //
4447 // See:
4448 // 1085341: 32-bit stdio routines should support file descriptors >255
4449 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4450 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4451 //
4452 #ifdef FD_CLOEXEC
4453 {
4454 int flags = ::fcntl(fd, F_GETFD);
4455 if (flags != -1) {
4456 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4457 }
4458 }
4459 #endif
4460
4461 return fd;
4462 }
4463
4464 // create binary file, rewriting existing file if required
4465 int os::create_binary_file(const char* path, bool rewrite_existing) {
4466 int oflags = O_WRONLY | O_CREAT;
4467 if (!rewrite_existing) {
4468 oflags |= O_EXCL;
4469 }
4470 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4471 }
4472
4473 // return current position of file pointer
4474 jlong os::current_file_offset(int fd) {
4475 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4476 }
4477
4478 // move file pointer to the specified offset
4479 jlong os::seek_to_file_offset(int fd, jlong offset) {
4480 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4481 }
4482
4483 jlong os::lseek(int fd, jlong offset, int whence) {
4484 return (jlong) ::lseek64(fd, offset, whence);
4485 }
4486
4487 char * os::native_path(char *path) {
4488 return path;
4489 }
4490
4491 int os::ftruncate(int fd, jlong length) {
4492 return ::ftruncate64(fd, length);
4493 }
4494
4495 int os::fsync(int fd) {
4496 RESTARTABLE_RETURN_INT(::fsync(fd));
4497 }
4498
4499 int os::available(int fd, jlong *bytes) {
4500 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4501 "Assumed _thread_in_native");
4502 jlong cur, end;
4503 int mode;
4504 struct stat64 buf64;
4505
4506 if (::fstat64(fd, &buf64) >= 0) {
4507 mode = buf64.st_mode;
4508 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4509 int n,ioctl_return;
4510
4511 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4512 if (ioctl_return>= 0) {
4513 *bytes = n;
4514 return 1;
4515 }
4516 }
4517 }
4518 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4519 return 0;
4520 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4521 return 0;
4522 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4523 return 0;
4524 }
4525 *bytes = end - cur;
4526 return 1;
4527 }
4528
4529 // Map a block of memory.
4530 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4531 char *addr, size_t bytes, bool read_only,
4532 bool allow_exec) {
4533 int prot;
4534 int flags;
4535
4536 if (read_only) {
4537 prot = PROT_READ;
4538 flags = MAP_SHARED;
4539 } else {
4540 prot = PROT_READ | PROT_WRITE;
4541 flags = MAP_PRIVATE;
4542 }
4543
4544 if (allow_exec) {
4545 prot |= PROT_EXEC;
4546 }
4547
4548 if (addr != NULL) {
4549 flags |= MAP_FIXED;
4550 }
4551
4552 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4553 fd, file_offset);
4554 if (mapped_address == MAP_FAILED) {
4555 return NULL;
4556 }
4557 return mapped_address;
4558 }
4559
4560
4561 // Remap a block of memory.
4562 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4563 char *addr, size_t bytes, bool read_only,
4564 bool allow_exec) {
4565 // same as map_memory() on this OS
4566 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4567 allow_exec);
4568 }
4569
4570
4571 // Unmap a block of memory.
4572 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4573 return munmap(addr, bytes) == 0;
4574 }
4575
4576 void os::pause() {
4577 char filename[MAX_PATH];
4578 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4579 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4580 } else {
4581 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4582 }
4583
4584 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4585 if (fd != -1) {
4586 struct stat buf;
4587 ::close(fd);
4588 while (::stat(filename, &buf) == 0) {
4589 (void)::poll(NULL, 0, 100);
4590 }
4591 } else {
4592 jio_fprintf(stderr,
4593 "Could not open pause file '%s', continuing immediately.\n", filename);
4594 }
4595 }
4596
4597 #ifndef PRODUCT
4598 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4599 // Turn this on if you need to trace synch operations.
4600 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4601 // and call record_synch_enable and record_synch_disable
4602 // around the computation of interest.
4603
4604 void record_synch(char* name, bool returning); // defined below
4605
4606 class RecordSynch {
4607 char* _name;
4608 public:
4609 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4610 ~RecordSynch() { record_synch(_name, true); }
4611 };
4612
4613 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4614 extern "C" ret name params { \
4615 typedef ret name##_t params; \
4616 static name##_t* implem = NULL; \
4617 static int callcount = 0; \
4618 if (implem == NULL) { \
4619 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4620 if (implem == NULL) fatal(dlerror()); \
4621 } \
4622 ++callcount; \
4623 RecordSynch _rs(#name); \
4624 inner; \
4625 return implem args; \
4626 }
4627 // in dbx, examine callcounts this way:
4628 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4629
4630 #define CHECK_POINTER_OK(p) \
4631 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4632 #define CHECK_MU \
4633 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4634 #define CHECK_CV \
4635 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4636 #define CHECK_P(p) \
4637 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4638
4639 #define CHECK_MUTEX(mutex_op) \
4640 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4641
4642 CHECK_MUTEX( mutex_lock)
4643 CHECK_MUTEX( _mutex_lock)
4644 CHECK_MUTEX( mutex_unlock)
4645 CHECK_MUTEX(_mutex_unlock)
4646 CHECK_MUTEX( mutex_trylock)
4647 CHECK_MUTEX(_mutex_trylock)
4648
4649 #define CHECK_COND(cond_op) \
4650 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4651
4652 CHECK_COND( cond_wait);
4653 CHECK_COND(_cond_wait);
4654 CHECK_COND(_cond_wait_cancel);
4655
4656 #define CHECK_COND2(cond_op) \
4657 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4658
4659 CHECK_COND2( cond_timedwait);
4660 CHECK_COND2(_cond_timedwait);
4661 CHECK_COND2(_cond_timedwait_cancel);
4662
4663 // do the _lwp_* versions too
4664 #define mutex_t lwp_mutex_t
4665 #define cond_t lwp_cond_t
4666 CHECK_MUTEX( _lwp_mutex_lock)
4667 CHECK_MUTEX( _lwp_mutex_unlock)
4668 CHECK_MUTEX( _lwp_mutex_trylock)
4669 CHECK_MUTEX( __lwp_mutex_lock)
4670 CHECK_MUTEX( __lwp_mutex_unlock)
4671 CHECK_MUTEX( __lwp_mutex_trylock)
4672 CHECK_MUTEX(___lwp_mutex_lock)
4673 CHECK_MUTEX(___lwp_mutex_unlock)
4674
4675 CHECK_COND( _lwp_cond_wait);
4676 CHECK_COND( __lwp_cond_wait);
4677 CHECK_COND(___lwp_cond_wait);
4678
4679 CHECK_COND2( _lwp_cond_timedwait);
4680 CHECK_COND2( __lwp_cond_timedwait);
4681 #undef mutex_t
4682 #undef cond_t
4683
4684 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4685 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4686 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4687 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4688 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4689 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4690 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4691 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4692
4693
4694 // recording machinery:
4695
4696 enum { RECORD_SYNCH_LIMIT = 200 };
4697 char* record_synch_name[RECORD_SYNCH_LIMIT];
4698 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4699 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4700 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4701 int record_synch_count = 0;
4702 bool record_synch_enabled = false;
4703
4704 // in dbx, examine recorded data this way:
4705 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4706
4707 void record_synch(char* name, bool returning) {
4708 if (record_synch_enabled) {
4709 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4710 record_synch_name[record_synch_count] = name;
4711 record_synch_returning[record_synch_count] = returning;
4712 record_synch_thread[record_synch_count] = thr_self();
4713 record_synch_arg0ptr[record_synch_count] = &name;
4714 record_synch_count++;
4715 }
4716 // put more checking code here:
4717 // ...
4718 }
4719 }
4720
4721 void record_synch_enable() {
4722 // start collecting trace data, if not already doing so
4723 if (!record_synch_enabled) record_synch_count = 0;
4724 record_synch_enabled = true;
4725 }
4726
4727 void record_synch_disable() {
4728 // stop collecting trace data
4729 record_synch_enabled = false;
4730 }
4731
4732 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4733 #endif // PRODUCT
4734
4735 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4736 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4737 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4738
4739
4740 // JVMTI & JVM monitoring and management support
4741 // The thread_cpu_time() and current_thread_cpu_time() are only
4742 // supported if is_thread_cpu_time_supported() returns true.
4743 // They are not supported on Solaris T1.
4744
4745 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4746 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4747 // of a thread.
4748 //
4749 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4750 // returns the fast estimate available on the platform.
4751
4752 // hrtime_t gethrvtime() return value includes
4753 // user time but does not include system time
4754 jlong os::current_thread_cpu_time() {
4755 return (jlong) gethrvtime();
4756 }
4757
4758 jlong os::thread_cpu_time(Thread *thread) {
4759 // return user level CPU time only to be consistent with
4760 // what current_thread_cpu_time returns.
4761 // thread_cpu_time_info() must be changed if this changes
4762 return os::thread_cpu_time(thread, false /* user time only */);
4763 }
4764
4765 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4766 if (user_sys_cpu_time) {
4767 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4768 } else {
4769 return os::current_thread_cpu_time();
4770 }
4771 }
4772
4773 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4774 char proc_name[64];
4775 int count;
4776 prusage_t prusage;
4777 jlong lwp_time;
4778 int fd;
4779
4780 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4781 getpid(),
4782 thread->osthread()->lwp_id());
4783 fd = ::open(proc_name, O_RDONLY);
4784 if (fd == -1) return -1;
4785
4786 do {
4787 count = ::pread(fd,
4788 (void *)&prusage.pr_utime,
4789 thr_time_size,
4790 thr_time_off);
4791 } while (count < 0 && errno == EINTR);
4792 ::close(fd);
4793 if (count < 0) return -1;
4794
4795 if (user_sys_cpu_time) {
4796 // user + system CPU time
4797 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4798 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4799 (jlong)prusage.pr_stime.tv_nsec +
4800 (jlong)prusage.pr_utime.tv_nsec;
4801 } else {
4802 // user level CPU time only
4803 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4804 (jlong)prusage.pr_utime.tv_nsec;
4805 }
4806
4807 return (lwp_time);
4808 }
4809
4810 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4811 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4812 info_ptr->may_skip_backward = false; // elapsed time not wall time
4813 info_ptr->may_skip_forward = false; // elapsed time not wall time
4814 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4815 }
4816
4817 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4818 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4819 info_ptr->may_skip_backward = false; // elapsed time not wall time
4820 info_ptr->may_skip_forward = false; // elapsed time not wall time
4821 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4822 }
4823
4824 bool os::is_thread_cpu_time_supported() {
4825 return true;
4826 }
4827
4828 // System loadavg support. Returns -1 if load average cannot be obtained.
4829 // Return the load average for our processor set if the primitive exists
4830 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4831 int os::loadavg(double loadavg[], int nelem) {
4832 if (pset_getloadavg_ptr != NULL) {
4833 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4834 } else {
4835 return ::getloadavg(loadavg, nelem);
4836 }
4837 }
4838
4839 //---------------------------------------------------------------------------------
4840
4841 bool os::find(address addr, outputStream* st) {
4842 Dl_info dlinfo;
4843 memset(&dlinfo, 0, sizeof(dlinfo));
4844 if (dladdr(addr, &dlinfo) != 0) {
4845 st->print(PTR_FORMAT ": ", addr);
4846 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4847 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4848 } else if (dlinfo.dli_fbase != NULL) {
4849 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4850 } else {
4851 st->print("<absolute address>");
4852 }
4853 if (dlinfo.dli_fname != NULL) {
4854 st->print(" in %s", dlinfo.dli_fname);
4855 }
4856 if (dlinfo.dli_fbase != NULL) {
4857 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4858 }
4859 st->cr();
4860
4861 if (Verbose) {
4862 // decode some bytes around the PC
4863 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4864 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4865 address lowest = (address) dlinfo.dli_sname;
4866 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4867 if (begin < lowest) begin = lowest;
4868 Dl_info dlinfo2;
4869 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4870 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4871 end = (address) dlinfo2.dli_saddr;
4872 }
4873 Disassembler::decode(begin, end, st);
4874 }
4875 return true;
4876 }
4877 return false;
4878 }
4879
4880 // Following function has been added to support HotSparc's libjvm.so running
4881 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4882 // src/solaris/hpi/native_threads in the EVM codebase.
4883 //
4884 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4885 // libraries and should thus be removed. We will leave it behind for a while
4886 // until we no longer want to able to run on top of 1.3.0 Solaris production
4887 // JDK. See 4341971.
4888
4889 #define STACK_SLACK 0x800
4890
4891 extern "C" {
4892 intptr_t sysThreadAvailableStackWithSlack() {
4893 stack_t st;
4894 intptr_t retval, stack_top;
4895 retval = thr_stksegment(&st);
4896 assert(retval == 0, "incorrect return value from thr_stksegment");
4897 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4898 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4899 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4900 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4901 }
4902 }
4903
4904 // ObjectMonitor park-unpark infrastructure ...
4905 //
4906 // We implement Solaris and Linux PlatformEvents with the
4907 // obvious condvar-mutex-flag triple.
4908 // Another alternative that works quite well is pipes:
4909 // Each PlatformEvent consists of a pipe-pair.
4910 // The thread associated with the PlatformEvent
4911 // calls park(), which reads from the input end of the pipe.
4912 // Unpark() writes into the other end of the pipe.
4913 // The write-side of the pipe must be set NDELAY.
4914 // Unfortunately pipes consume a large # of handles.
4915 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4916 // Using pipes for the 1st few threads might be workable, however.
4917 //
4918 // park() is permitted to return spuriously.
4919 // Callers of park() should wrap the call to park() in
4920 // an appropriate loop. A litmus test for the correct
4921 // usage of park is the following: if park() were modified
4922 // to immediately return 0 your code should still work,
4923 // albeit degenerating to a spin loop.
4924 //
4925 // In a sense, park()-unpark() just provides more polite spinning
4926 // and polling with the key difference over naive spinning being
4927 // that a parked thread needs to be explicitly unparked() in order
4928 // to wake up and to poll the underlying condition.
4929 //
4930 // Assumption:
4931 // Only one parker can exist on an event, which is why we allocate
4932 // them per-thread. Multiple unparkers can coexist.
4933 //
4934 // _Event transitions in park()
4935 // -1 => -1 : illegal
4936 // 1 => 0 : pass - return immediately
4937 // 0 => -1 : block; then set _Event to 0 before returning
4938 //
4939 // _Event transitions in unpark()
4940 // 0 => 1 : just return
4941 // 1 => 1 : just return
4942 // -1 => either 0 or 1; must signal target thread
4943 // That is, we can safely transition _Event from -1 to either
4944 // 0 or 1.
4945 //
4946 // _Event serves as a restricted-range semaphore.
4947 // -1 : thread is blocked, i.e. there is a waiter
4948 // 0 : neutral: thread is running or ready,
4949 // could have been signaled after a wait started
4950 // 1 : signaled - thread is running or ready
4951 //
4952 // Another possible encoding of _Event would be with
4953 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4954 //
4955 // TODO-FIXME: add DTRACE probes for:
4956 // 1. Tx parks
4957 // 2. Ty unparks Tx
4958 // 3. Tx resumes from park
4959
4960
4961 // value determined through experimentation
4962 #define ROUNDINGFIX 11
4963
4964 // utility to compute the abstime argument to timedwait.
4965 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4966
4967 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4968 // millis is the relative timeout time
4969 // abstime will be the absolute timeout time
4970 if (millis < 0) millis = 0;
4971 struct timeval now;
4972 int status = gettimeofday(&now, NULL);
4973 assert(status == 0, "gettimeofday");
4974 jlong seconds = millis / 1000;
4975 jlong max_wait_period;
4976
4977 if (UseLWPSynchronization) {
4978 // forward port of fix for 4275818 (not sleeping long enough)
4979 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
4980 // _lwp_cond_timedwait() used a round_down algorithm rather
4981 // than a round_up. For millis less than our roundfactor
4982 // it rounded down to 0 which doesn't meet the spec.
4983 // For millis > roundfactor we may return a bit sooner, but
4984 // since we can not accurately identify the patch level and
4985 // this has already been fixed in Solaris 9 and 8 we will
4986 // leave it alone rather than always rounding down.
4987
4988 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
4989 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
4990 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
4991 max_wait_period = 21000000;
4992 } else {
4993 max_wait_period = 50000000;
4994 }
4995 millis %= 1000;
4996 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
4997 seconds = max_wait_period;
4998 }
4999 abstime->tv_sec = now.tv_sec + seconds;
5000 long usec = now.tv_usec + millis * 1000;
5001 if (usec >= 1000000) {
5002 abstime->tv_sec += 1;
5003 usec -= 1000000;
5004 }
5005 abstime->tv_nsec = usec * 1000;
5006 return abstime;
5007 }
5008
5009 void os::PlatformEvent::park() { // AKA: down()
5010 // Transitions for _Event:
5011 // -1 => -1 : illegal
5012 // 1 => 0 : pass - return immediately
5013 // 0 => -1 : block; then set _Event to 0 before returning
5014
5015 // Invariant: Only the thread associated with the Event/PlatformEvent
5016 // may call park().
5017 assert(_nParked == 0, "invariant");
5018
5019 int v;
5020 for (;;) {
5021 v = _Event;
5022 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5023 }
5024 guarantee(v >= 0, "invariant");
5025 if (v == 0) {
5026 // Do this the hard way by blocking ...
5027 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5028 int status = os::Solaris::mutex_lock(_mutex);
5029 assert_status(status == 0, status, "mutex_lock");
5030 guarantee(_nParked == 0, "invariant");
5031 ++_nParked;
5032 while (_Event < 0) {
5033 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5034 // Treat this the same as if the wait was interrupted
5035 // With usr/lib/lwp going to kernel, always handle ETIME
5036 status = os::Solaris::cond_wait(_cond, _mutex);
5037 if (status == ETIME) status = EINTR;
5038 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5039 }
5040 --_nParked;
5041 _Event = 0;
5042 status = os::Solaris::mutex_unlock(_mutex);
5043 assert_status(status == 0, status, "mutex_unlock");
5044 // Paranoia to ensure our locked and lock-free paths interact
5045 // correctly with each other.
5046 OrderAccess::fence();
5047 }
5048 }
5049
5050 int os::PlatformEvent::park(jlong millis) {
5051 // Transitions for _Event:
5052 // -1 => -1 : illegal
5053 // 1 => 0 : pass - return immediately
5054 // 0 => -1 : block; then set _Event to 0 before returning
5055
5056 guarantee(_nParked == 0, "invariant");
5057 int v;
5058 for (;;) {
5059 v = _Event;
5060 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5061 }
5062 guarantee(v >= 0, "invariant");
5063 if (v != 0) return OS_OK;
5064
5065 int ret = OS_TIMEOUT;
5066 timestruc_t abst;
5067 compute_abstime(&abst, millis);
5068
5069 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5070 int status = os::Solaris::mutex_lock(_mutex);
5071 assert_status(status == 0, status, "mutex_lock");
5072 guarantee(_nParked == 0, "invariant");
5073 ++_nParked;
5074 while (_Event < 0) {
5075 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5076 assert_status(status == 0 || status == EINTR ||
5077 status == ETIME || status == ETIMEDOUT,
5078 status, "cond_timedwait");
5079 if (!FilterSpuriousWakeups) break; // previous semantics
5080 if (status == ETIME || status == ETIMEDOUT) break;
5081 // We consume and ignore EINTR and spurious wakeups.
5082 }
5083 --_nParked;
5084 if (_Event >= 0) ret = OS_OK;
5085 _Event = 0;
5086 status = os::Solaris::mutex_unlock(_mutex);
5087 assert_status(status == 0, status, "mutex_unlock");
5088 // Paranoia to ensure our locked and lock-free paths interact
5089 // correctly with each other.
5090 OrderAccess::fence();
5091 return ret;
5092 }
5093
5094 void os::PlatformEvent::unpark() {
5095 // Transitions for _Event:
5096 // 0 => 1 : just return
5097 // 1 => 1 : just return
5098 // -1 => either 0 or 1; must signal target thread
5099 // That is, we can safely transition _Event from -1 to either
5100 // 0 or 1.
5101 // See also: "Semaphores in Plan 9" by Mullender & Cox
5102 //
5103 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5104 // that it will take two back-to-back park() calls for the owning
5105 // thread to block. This has the benefit of forcing a spurious return
5106 // from the first park() call after an unpark() call which will help
5107 // shake out uses of park() and unpark() without condition variables.
5108
5109 if (Atomic::xchg(1, &_Event) >= 0) return;
5110
5111 // If the thread associated with the event was parked, wake it.
5112 // Wait for the thread assoc with the PlatformEvent to vacate.
5113 int status = os::Solaris::mutex_lock(_mutex);
5114 assert_status(status == 0, status, "mutex_lock");
5115 int AnyWaiters = _nParked;
5116 status = os::Solaris::mutex_unlock(_mutex);
5117 assert_status(status == 0, status, "mutex_unlock");
5118 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5119 if (AnyWaiters != 0) {
5120 // Note that we signal() *after* dropping the lock for "immortal" Events.
5121 // This is safe and avoids a common class of futile wakeups. In rare
5122 // circumstances this can cause a thread to return prematurely from
5123 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5124 // will simply re-test the condition and re-park itself.
5125 // This provides particular benefit if the underlying platform does not
5126 // provide wait morphing.
5127 status = os::Solaris::cond_signal(_cond);
5128 assert_status(status == 0, status, "cond_signal");
5129 }
5130 }
5131
5132 // JSR166
5133 // -------------------------------------------------------
5134
5135 // The solaris and linux implementations of park/unpark are fairly
5136 // conservative for now, but can be improved. They currently use a
5137 // mutex/condvar pair, plus _counter.
5138 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5139 // sets count to 1 and signals condvar. Only one thread ever waits
5140 // on the condvar. Contention seen when trying to park implies that someone
5141 // is unparking you, so don't wait. And spurious returns are fine, so there
5142 // is no need to track notifications.
5143
5144 #define MAX_SECS 100000000
5145
5146 // This code is common to linux and solaris and will be moved to a
5147 // common place in dolphin.
5148 //
5149 // The passed in time value is either a relative time in nanoseconds
5150 // or an absolute time in milliseconds. Either way it has to be unpacked
5151 // into suitable seconds and nanoseconds components and stored in the
5152 // given timespec structure.
5153 // Given time is a 64-bit value and the time_t used in the timespec is only
5154 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5155 // overflow if times way in the future are given. Further on Solaris versions
5156 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5157 // number of seconds, in abstime, is less than current_time + 100,000,000.
5158 // As it will be 28 years before "now + 100000000" will overflow we can
5159 // ignore overflow and just impose a hard-limit on seconds using the value
5160 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5161 // years from "now".
5162 //
5163 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5164 assert(time > 0, "convertTime");
5165
5166 struct timeval now;
5167 int status = gettimeofday(&now, NULL);
5168 assert(status == 0, "gettimeofday");
5169
5170 time_t max_secs = now.tv_sec + MAX_SECS;
5171
5172 if (isAbsolute) {
5173 jlong secs = time / 1000;
5174 if (secs > max_secs) {
5175 absTime->tv_sec = max_secs;
5176 } else {
5177 absTime->tv_sec = secs;
5178 }
5179 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5180 } else {
5181 jlong secs = time / NANOSECS_PER_SEC;
5182 if (secs >= MAX_SECS) {
5183 absTime->tv_sec = max_secs;
5184 absTime->tv_nsec = 0;
5185 } else {
5186 absTime->tv_sec = now.tv_sec + secs;
5187 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5188 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5189 absTime->tv_nsec -= NANOSECS_PER_SEC;
5190 ++absTime->tv_sec; // note: this must be <= max_secs
5191 }
5192 }
5193 }
5194 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5195 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5196 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5197 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5198 }
5199
5200 void Parker::park(bool isAbsolute, jlong time) {
5201 // Ideally we'd do something useful while spinning, such
5202 // as calling unpackTime().
5203
5204 // Optional fast-path check:
5205 // Return immediately if a permit is available.
5206 // We depend on Atomic::xchg() having full barrier semantics
5207 // since we are doing a lock-free update to _counter.
5208 if (Atomic::xchg(0, &_counter) > 0) return;
5209
5210 // Optional fast-exit: Check interrupt before trying to wait
5211 Thread* thread = Thread::current();
5212 assert(thread->is_Java_thread(), "Must be JavaThread");
5213 JavaThread *jt = (JavaThread *)thread;
5214 if (Thread::is_interrupted(thread, false)) {
5215 return;
5216 }
5217
5218 // First, demultiplex/decode time arguments
5219 timespec absTime;
5220 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5221 return;
5222 }
5223 if (time > 0) {
5224 // Warning: this code might be exposed to the old Solaris time
5225 // round-down bugs. Grep "roundingFix" for details.
5226 unpackTime(&absTime, isAbsolute, time);
5227 }
5228
5229 // Enter safepoint region
5230 // Beware of deadlocks such as 6317397.
5231 // The per-thread Parker:: _mutex is a classic leaf-lock.
5232 // In particular a thread must never block on the Threads_lock while
5233 // holding the Parker:: mutex. If safepoints are pending both the
5234 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5235 ThreadBlockInVM tbivm(jt);
5236
5237 // Don't wait if cannot get lock since interference arises from
5238 // unblocking. Also. check interrupt before trying wait
5239 if (Thread::is_interrupted(thread, false) ||
5240 os::Solaris::mutex_trylock(_mutex) != 0) {
5241 return;
5242 }
5243
5244 int status;
5245
5246 if (_counter > 0) { // no wait needed
5247 _counter = 0;
5248 status = os::Solaris::mutex_unlock(_mutex);
5249 assert(status == 0, "invariant");
5250 // Paranoia to ensure our locked and lock-free paths interact
5251 // correctly with each other and Java-level accesses.
5252 OrderAccess::fence();
5253 return;
5254 }
5255
5256 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5257 jt->set_suspend_equivalent();
5258 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5259
5260 // Do this the hard way by blocking ...
5261 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5262 if (time == 0) {
5263 status = os::Solaris::cond_wait(_cond, _mutex);
5264 } else {
5265 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5266 }
5267 // Note that an untimed cond_wait() can sometimes return ETIME on older
5268 // versions of the Solaris.
5269 assert_status(status == 0 || status == EINTR ||
5270 status == ETIME || status == ETIMEDOUT,
5271 status, "cond_timedwait");
5272
5273 _counter = 0;
5274 status = os::Solaris::mutex_unlock(_mutex);
5275 assert_status(status == 0, status, "mutex_unlock");
5276 // Paranoia to ensure our locked and lock-free paths interact
5277 // correctly with each other and Java-level accesses.
5278 OrderAccess::fence();
5279
5280 // If externally suspended while waiting, re-suspend
5281 if (jt->handle_special_suspend_equivalent_condition()) {
5282 jt->java_suspend_self();
5283 }
5284 }
5285
5286 void Parker::unpark() {
5287 int status = os::Solaris::mutex_lock(_mutex);
5288 assert(status == 0, "invariant");
5289 const int s = _counter;
5290 _counter = 1;
5291 status = os::Solaris::mutex_unlock(_mutex);
5292 assert(status == 0, "invariant");
5293
5294 if (s < 1) {
5295 status = os::Solaris::cond_signal(_cond);
5296 assert(status == 0, "invariant");
5297 }
5298 }
5299
5300 extern char** environ;
5301
5302 // Run the specified command in a separate process. Return its exit value,
5303 // or -1 on failure (e.g. can't fork a new process).
5304 // Unlike system(), this function can be called from signal handler. It
5305 // doesn't block SIGINT et al.
5306 int os::fork_and_exec(char* cmd) {
5307 char * argv[4];
5308 argv[0] = (char *)"sh";
5309 argv[1] = (char *)"-c";
5310 argv[2] = cmd;
5311 argv[3] = NULL;
5312
5313 // fork is async-safe, fork1 is not so can't use in signal handler
5314 pid_t pid;
5315 Thread* t = Thread::current_or_null_safe();
5316 if (t != NULL && t->is_inside_signal_handler()) {
5317 pid = fork();
5318 } else {
5319 pid = fork1();
5320 }
5321
5322 if (pid < 0) {
5323 // fork failed
5324 warning("fork failed: %s", os::strerror(errno));
5325 return -1;
5326
5327 } else if (pid == 0) {
5328 // child process
5329
5330 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5331 execve("/usr/bin/sh", argv, environ);
5332
5333 // execve failed
5334 _exit(-1);
5335
5336 } else {
5337 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5338 // care about the actual exit code, for now.
5339
5340 int status;
5341
5342 // Wait for the child process to exit. This returns immediately if
5343 // the child has already exited. */
5344 while (waitpid(pid, &status, 0) < 0) {
5345 switch (errno) {
5346 case ECHILD: return 0;
5347 case EINTR: break;
5348 default: return -1;
5349 }
5350 }
5351
5352 if (WIFEXITED(status)) {
5353 // The child exited normally; get its exit code.
5354 return WEXITSTATUS(status);
5355 } else if (WIFSIGNALED(status)) {
5356 // The child exited because of a signal
5357 // The best value to return is 0x80 + signal number,
5358 // because that is what all Unix shells do, and because
5359 // it allows callers to distinguish between process exit and
5360 // process death by signal.
5361 return 0x80 + WTERMSIG(status);
5362 } else {
5363 // Unknown exit code; pass it through
5364 return status;
5365 }
5366 }
5367 }
5368
5369 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5370 size_t res;
5371 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5372 return res;
5373 }
5374
5375 int os::close(int fd) {
5376 return ::close(fd);
5377 }
5378
5379 int os::socket_close(int fd) {
5380 return ::close(fd);
5381 }
5382
5383 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5384 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5385 "Assumed _thread_in_native");
5386 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5387 }
5388
5389 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5390 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5391 "Assumed _thread_in_native");
5392 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5393 }
5394
5395 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5396 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5397 }
5398
5399 // As both poll and select can be interrupted by signals, we have to be
5400 // prepared to restart the system call after updating the timeout, unless
5401 // a poll() is done with timeout == -1, in which case we repeat with this
5402 // "wait forever" value.
5403
5404 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5405 int _result;
5406 _result = ::connect(fd, him, len);
5407
5408 // On Solaris, when a connect() call is interrupted, the connection
5409 // can be established asynchronously (see 6343810). Subsequent calls
5410 // to connect() must check the errno value which has the semantic
5411 // described below (copied from the connect() man page). Handling
5412 // of asynchronously established connections is required for both
5413 // blocking and non-blocking sockets.
5414 // EINTR The connection attempt was interrupted
5415 // before any data arrived by the delivery of
5416 // a signal. The connection, however, will be
5417 // established asynchronously.
5418 //
5419 // EINPROGRESS The socket is non-blocking, and the connec-
5420 // tion cannot be completed immediately.
5421 //
5422 // EALREADY The socket is non-blocking, and a previous
5423 // connection attempt has not yet been com-
5424 // pleted.
5425 //
5426 // EISCONN The socket is already connected.
5427 if (_result == OS_ERR && errno == EINTR) {
5428 // restarting a connect() changes its errno semantics
5429 RESTARTABLE(::connect(fd, him, len), _result);
5430 // undo these changes
5431 if (_result == OS_ERR) {
5432 if (errno == EALREADY) {
5433 errno = EINPROGRESS; // fall through
5434 } else if (errno == EISCONN) {
5435 errno = 0;
5436 return OS_OK;
5437 }
5438 }
5439 }
5440 return _result;
5441 }
5442
5443 // Get the default path to the core file
5444 // Returns the length of the string
5445 int os::get_core_path(char* buffer, size_t bufferSize) {
5446 const char* p = get_current_directory(buffer, bufferSize);
5447
5448 if (p == NULL) {
5449 assert(p != NULL, "failed to get current directory");
5450 return 0;
5451 }
5452
5453 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5454 p, current_process_id());
5455
5456 return strlen(buffer);
5457 }
5458
5459 #ifndef PRODUCT
5460 void TestReserveMemorySpecial_test() {
5461 // No tests available for this platform
5462 }
5463 #endif
5464
5465 bool os::start_debugging(char *buf, int buflen) {
5466 int len = (int)strlen(buf);
5467 char *p = &buf[len];
5468
5469 jio_snprintf(p, buflen-len,
5470 "\n\n"
5471 "Do you want to debug the problem?\n\n"
5472 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5473 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5474 "Otherwise, press RETURN to abort...",
5475 os::current_process_id(), os::current_thread_id());
5476
5477 bool yes = os::message_box("Unexpected Error", buf);
5478
5479 if (yes) {
5480 // yes, user asked VM to launch debugger
5481 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5482
5483 os::fork_and_exec(buf);
5484 yes = false;
5485 }
5486 return yes;
5487 }