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