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