1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "os_solaris.inline.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm_misc.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/atomic.hpp"
45 #include "runtime/extendedPC.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/interfaceSupport.inline.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/javaCalls.hpp"
50 #include "runtime/mutexLocker.hpp"
51 #include "runtime/objectMonitor.hpp"
52 #include "runtime/orderAccess.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/perfMemory.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/stubRoutines.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/threadCritical.hpp"
60 #include "runtime/timer.hpp"
61 #include "runtime/vm_version.hpp"
62 #include "semaphore_posix.hpp"
63 #include "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/align.hpp"
67 #include "utilities/decoder.hpp"
68 #include "utilities/defaultStream.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/growableArray.hpp"
71 #include "utilities/macros.hpp"
72 #include "utilities/vmError.hpp"
73
74 // put OS-includes here
75 # include <dlfcn.h>
76 # include <errno.h>
77 # include <exception>
78 # include <link.h>
79 # include <poll.h>
80 # include <pthread.h>
81 # include <setjmp.h>
82 # include <signal.h>
83 # include <stdio.h>
84 # include <alloca.h>
85 # include <sys/filio.h>
86 # include <sys/ipc.h>
87 # include <sys/lwp.h>
88 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
89 # include <sys/mman.h>
90 # include <sys/processor.h>
91 # include <sys/procset.h>
92 # include <sys/pset.h>
93 # include <sys/resource.h>
94 # include <sys/shm.h>
95 # include <sys/socket.h>
96 # include <sys/stat.h>
97 # include <sys/systeminfo.h>
98 # include <sys/time.h>
99 # include <sys/times.h>
100 # include <sys/types.h>
101 # include <sys/wait.h>
102 # include <sys/utsname.h>
103 # include <thread.h>
104 # include <unistd.h>
105 # include <sys/priocntl.h>
106 # include <sys/rtpriocntl.h>
107 # include <sys/tspriocntl.h>
108 # include <sys/iapriocntl.h>
109 # include <sys/fxpriocntl.h>
110 # include <sys/loadavg.h>
111 # include <string.h>
112 # include <stdio.h>
113
114 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
115 # include <sys/procfs.h> // see comment in <sys/procfs.h>
116
117 #define MAX_PATH (2 * K)
118
119 // for timer info max values which include all bits
120 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
121
122
123 // Here are some liblgrp types from sys/lgrp_user.h to be able to
124 // compile on older systems without this header file.
125
126 #ifndef MADV_ACCESS_LWP
127 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
128 #endif
129 #ifndef MADV_ACCESS_MANY
130 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
131 #endif
132
133 #ifndef LGRP_RSRC_CPU
134 #define LGRP_RSRC_CPU 0 /* CPU resources */
135 #endif
136 #ifndef LGRP_RSRC_MEM
137 #define LGRP_RSRC_MEM 1 /* memory resources */
138 #endif
139
140 // Values for ThreadPriorityPolicy == 1
141 int prio_policy1[CriticalPriority+1] = {
142 -99999, 0, 16, 32, 48, 64,
143 80, 96, 112, 124, 127, 127 };
144
145 // System parameters used internally
146 static clock_t clock_tics_per_sec = 100;
147
148 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
149 static bool enabled_extended_FILE_stdio = false;
150
151 // For diagnostics to print a message once. see run_periodic_checks
152 static bool check_addr0_done = false;
153 static sigset_t check_signal_done;
154 static bool check_signals = true;
155
156 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
157 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
158
159 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
160
161 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
162
163 // "default" initializers for missing libc APIs
164 extern "C" {
165 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
166 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
167
168 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
169 static int lwp_cond_destroy(cond_t *cv) { return 0; }
170 }
171
172 // "default" initializers for pthread-based synchronization
173 extern "C" {
174 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
175 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
176 }
177
178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
179
180 static inline size_t adjust_stack_size(address base, size_t size) {
181 if ((ssize_t)size < 0) {
182 // 4759953: Compensate for ridiculous stack size.
183 size = max_intx;
184 }
185 if (size > (size_t)base) {
186 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
187 size = (size_t)base;
188 }
189 return size;
190 }
191
192 static inline stack_t get_stack_info() {
193 stack_t st;
194 int retval = thr_stksegment(&st);
195 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
196 assert(retval == 0, "incorrect return value from thr_stksegment");
197 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
198 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
199 return st;
200 }
201
202 static void _handle_uncaught_cxx_exception() {
203 VMError::report_and_die("An uncaught C++ exception");
204 }
205
206 bool os::is_primordial_thread(void) {
207 int r = thr_main();
208 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
209 return r == 1;
210 }
211
212 address os::current_stack_base() {
213 bool _is_primordial_thread = is_primordial_thread();
214
215 // Workaround 4352906, avoid calls to thr_stksegment by
216 // thr_main after the first one (it looks like we trash
217 // some data, causing the value for ss_sp to be incorrect).
218 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
219 stack_t st = get_stack_info();
220 if (_is_primordial_thread) {
221 // cache initial value of stack base
222 os::Solaris::_main_stack_base = (address)st.ss_sp;
223 }
224 return (address)st.ss_sp;
225 } else {
226 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
227 return os::Solaris::_main_stack_base;
228 }
229 }
230
231 size_t os::current_stack_size() {
232 size_t size;
233
234 if (!is_primordial_thread()) {
235 size = get_stack_info().ss_size;
236 } else {
237 struct rlimit limits;
238 getrlimit(RLIMIT_STACK, &limits);
239 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
240 }
241 // base may not be page aligned
242 address base = current_stack_base();
243 address bottom = align_up(base - size, os::vm_page_size());;
244 return (size_t)(base - bottom);
245 }
246
247 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
248 return localtime_r(clock, res);
249 }
250
251 void os::Solaris::try_enable_extended_io() {
252 typedef int (*enable_extended_FILE_stdio_t)(int, int);
253
254 if (!UseExtendedFileIO) {
255 return;
256 }
257
258 enable_extended_FILE_stdio_t enabler =
259 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
260 "enable_extended_FILE_stdio");
261 if (enabler) {
262 enabler(-1, -1);
263 }
264 }
265
266 static int _processors_online = 0;
267
268 jint os::Solaris::_os_thread_limit = 0;
269 volatile jint os::Solaris::_os_thread_count = 0;
270
271 julong os::available_memory() {
272 return Solaris::available_memory();
273 }
274
275 julong os::Solaris::available_memory() {
276 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
277 }
278
279 julong os::Solaris::_physical_memory = 0;
280
281 julong os::physical_memory() {
282 return Solaris::physical_memory();
283 }
284
285 static hrtime_t first_hrtime = 0;
286 static const hrtime_t hrtime_hz = 1000*1000*1000;
287 static volatile hrtime_t max_hrtime = 0;
288
289
290 void os::Solaris::initialize_system_info() {
291 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
292 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
293 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
294 (julong)sysconf(_SC_PAGESIZE);
295 }
296
297 uint os::processor_id() {
298 const processorid_t id = ::getcpuid();
299 assert(id >= 0 && id < _processor_count, "Invalid processor id");
300 return (uint)id;
301 }
302
303 int os::active_processor_count() {
304 // User has overridden the number of active processors
305 if (ActiveProcessorCount > 0) {
306 log_trace(os)("active_processor_count: "
307 "active processor count set by user : %d",
308 ActiveProcessorCount);
309 return ActiveProcessorCount;
310 }
311
312 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
313 pid_t pid = getpid();
314 psetid_t pset = PS_NONE;
315 // Are we running in a processor set or is there any processor set around?
316 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
317 uint_t pset_cpus;
318 // Query the number of cpus available to us.
319 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
320 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
321 _processors_online = pset_cpus;
322 return pset_cpus;
323 }
324 }
325 // Otherwise return number of online cpus
326 return online_cpus;
327 }
328
329 static bool find_processors_in_pset(psetid_t pset,
330 processorid_t** id_array,
331 uint_t* id_length) {
332 bool result = false;
333 // Find the number of processors in the processor set.
334 if (pset_info(pset, NULL, id_length, NULL) == 0) {
335 // Make up an array to hold their ids.
336 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
337 // Fill in the array with their processor ids.
338 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
339 result = true;
340 }
341 }
342 return result;
343 }
344
345 // Callers of find_processors_online() must tolerate imprecise results --
346 // the system configuration can change asynchronously because of DR
347 // or explicit psradm operations.
348 //
349 // We also need to take care that the loop (below) terminates as the
350 // number of processors online can change between the _SC_NPROCESSORS_ONLN
351 // request and the loop that builds the list of processor ids. Unfortunately
352 // there's no reliable way to determine the maximum valid processor id,
353 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
354 // man pages, which claim the processor id set is "sparse, but
355 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
356 // exit the loop.
357 //
358 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
359 // not available on S8.0.
360
361 static bool find_processors_online(processorid_t** id_array,
362 uint* id_length) {
363 const processorid_t MAX_PROCESSOR_ID = 100000;
364 // Find the number of processors online.
365 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
366 // Make up an array to hold their ids.
367 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
368 // Processors need not be numbered consecutively.
369 long found = 0;
370 processorid_t next = 0;
371 while (found < *id_length && next < MAX_PROCESSOR_ID) {
372 processor_info_t info;
373 if (processor_info(next, &info) == 0) {
374 // NB, PI_NOINTR processors are effectively online ...
375 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
376 (*id_array)[found] = next;
377 found += 1;
378 }
379 }
380 next += 1;
381 }
382 if (found < *id_length) {
383 // The loop above didn't identify the expected number of processors.
384 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
385 // and re-running the loop, above, but there's no guarantee of progress
386 // if the system configuration is in flux. Instead, we just return what
387 // we've got. Note that in the worst case find_processors_online() could
388 // return an empty set. (As a fall-back in the case of the empty set we
389 // could just return the ID of the current processor).
390 *id_length = found;
391 }
392
393 return true;
394 }
395
396 static bool assign_distribution(processorid_t* id_array,
397 uint id_length,
398 uint* distribution,
399 uint distribution_length) {
400 // We assume we can assign processorid_t's to uint's.
401 assert(sizeof(processorid_t) == sizeof(uint),
402 "can't convert processorid_t to uint");
403 // Quick check to see if we won't succeed.
404 if (id_length < distribution_length) {
405 return false;
406 }
407 // Assign processor ids to the distribution.
408 // Try to shuffle processors to distribute work across boards,
409 // assuming 4 processors per board.
410 const uint processors_per_board = ProcessDistributionStride;
411 // Find the maximum processor id.
412 processorid_t max_id = 0;
413 for (uint m = 0; m < id_length; m += 1) {
414 max_id = MAX2(max_id, id_array[m]);
415 }
416 // The next id, to limit loops.
417 const processorid_t limit_id = max_id + 1;
418 // Make up markers for available processors.
419 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
420 for (uint c = 0; c < limit_id; c += 1) {
421 available_id[c] = false;
422 }
423 for (uint a = 0; a < id_length; a += 1) {
424 available_id[id_array[a]] = true;
425 }
426 // Step by "boards", then by "slot", copying to "assigned".
427 // NEEDS_CLEANUP: The assignment of processors should be stateful,
428 // remembering which processors have been assigned by
429 // previous calls, etc., so as to distribute several
430 // independent calls of this method. What we'd like is
431 // It would be nice to have an API that let us ask
432 // how many processes are bound to a processor,
433 // but we don't have that, either.
434 // In the short term, "board" is static so that
435 // subsequent distributions don't all start at board 0.
436 static uint board = 0;
437 uint assigned = 0;
438 // Until we've found enough processors ....
439 while (assigned < distribution_length) {
440 // ... find the next available processor in the board.
441 for (uint slot = 0; slot < processors_per_board; slot += 1) {
442 uint try_id = board * processors_per_board + slot;
443 if ((try_id < limit_id) && (available_id[try_id] == true)) {
444 distribution[assigned] = try_id;
445 available_id[try_id] = false;
446 assigned += 1;
447 break;
448 }
449 }
450 board += 1;
451 if (board * processors_per_board + 0 >= limit_id) {
452 board = 0;
453 }
454 }
455 if (available_id != NULL) {
456 FREE_C_HEAP_ARRAY(bool, available_id);
457 }
458 return true;
459 }
460
461 void os::set_native_thread_name(const char *name) {
462 if (Solaris::_pthread_setname_np != NULL) {
463 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
464 // but we explicitly copy into a size-limited buffer to avoid any
465 // possible overflow.
466 char buf[32];
467 snprintf(buf, sizeof(buf), "%s", name);
468 buf[sizeof(buf) - 1] = '\0';
469 Solaris::_pthread_setname_np(pthread_self(), buf);
470 }
471 }
472
473 bool os::distribute_processes(uint length, uint* distribution) {
474 bool result = false;
475 // Find the processor id's of all the available CPUs.
476 processorid_t* id_array = NULL;
477 uint id_length = 0;
478 // There are some races between querying information and using it,
479 // since processor sets can change dynamically.
480 psetid_t pset = PS_NONE;
481 // Are we running in a processor set?
482 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
483 result = find_processors_in_pset(pset, &id_array, &id_length);
484 } else {
485 result = find_processors_online(&id_array, &id_length);
486 }
487 if (result == true) {
488 if (id_length >= length) {
489 result = assign_distribution(id_array, id_length, distribution, length);
490 } else {
491 result = false;
492 }
493 }
494 if (id_array != NULL) {
495 FREE_C_HEAP_ARRAY(processorid_t, id_array);
496 }
497 return result;
498 }
499
500 bool os::bind_to_processor(uint processor_id) {
501 // We assume that a processorid_t can be stored in a uint.
502 assert(sizeof(uint) == sizeof(processorid_t),
503 "can't convert uint to processorid_t");
504 int bind_result =
505 processor_bind(P_LWPID, // bind LWP.
506 P_MYID, // bind current LWP.
507 (processorid_t) processor_id, // id.
508 NULL); // don't return old binding.
509 return (bind_result == 0);
510 }
511
512 // Return true if user is running as root.
513
514 bool os::have_special_privileges() {
515 static bool init = false;
516 static bool privileges = false;
517 if (!init) {
518 privileges = (getuid() != geteuid()) || (getgid() != getegid());
519 init = true;
520 }
521 return privileges;
522 }
523
524
525 void os::init_system_properties_values() {
526 // The next steps are taken in the product version:
527 //
528 // Obtain the JAVA_HOME value from the location of libjvm.so.
529 // This library should be located at:
530 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
531 //
532 // If "/jre/lib/" appears at the right place in the path, then we
533 // assume libjvm.so is installed in a JDK and we use this path.
534 //
535 // Otherwise exit with message: "Could not create the Java virtual machine."
536 //
537 // The following extra steps are taken in the debugging version:
538 //
539 // If "/jre/lib/" does NOT appear at the right place in the path
540 // instead of exit check for $JAVA_HOME environment variable.
541 //
542 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
543 // then we append a fake suffix "hotspot/libjvm.so" to this path so
544 // it looks like libjvm.so is installed there
545 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
546 //
547 // Otherwise exit.
548 //
549 // Important note: if the location of libjvm.so changes this
550 // code needs to be changed accordingly.
551
552 // Base path of extensions installed on the system.
553 #define SYS_EXT_DIR "/usr/jdk/packages"
554 #define EXTENSIONS_DIR "/lib/ext"
555
556 // Buffer that fits several sprintfs.
557 // Note that the space for the colon and the trailing null are provided
558 // by the nulls included by the sizeof operator.
559 const size_t bufsize =
560 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
561 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
562 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
563 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
564
565 // sysclasspath, java_home, dll_dir
566 {
567 char *pslash;
568 os::jvm_path(buf, bufsize);
569
570 // Found the full path to libjvm.so.
571 // Now cut the path to <java_home>/jre if we can.
572 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
573 pslash = strrchr(buf, '/');
574 if (pslash != NULL) {
575 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
576 }
577 Arguments::set_dll_dir(buf);
578
579 if (pslash != NULL) {
580 pslash = strrchr(buf, '/');
581 if (pslash != NULL) {
582 *pslash = '\0'; // Get rid of /lib.
583 }
584 }
585 Arguments::set_java_home(buf);
586 if (!set_boot_path('/', ':')) {
587 vm_exit_during_initialization("Failed setting boot class path.", NULL);
588 }
589 }
590
591 // Where to look for native libraries.
592 {
593 // Use dlinfo() to determine the correct java.library.path.
594 //
595 // If we're launched by the Java launcher, and the user
596 // does not set java.library.path explicitly on the commandline,
597 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
598 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
599 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
600 // /usr/lib), which is exactly what we want.
601 //
602 // If the user does set java.library.path, it completely
603 // overwrites this setting, and always has.
604 //
605 // If we're not launched by the Java launcher, we may
606 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
607 // settings. Again, dlinfo does exactly what we want.
608
609 Dl_serinfo info_sz, *info = &info_sz;
610 Dl_serpath *path;
611 char *library_path;
612 char *common_path = buf;
613
614 // Determine search path count and required buffer size.
615 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
616 FREE_C_HEAP_ARRAY(char, buf);
617 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
618 }
619
620 // Allocate new buffer and initialize.
621 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
622 info->dls_size = info_sz.dls_size;
623 info->dls_cnt = info_sz.dls_cnt;
624
625 // Obtain search path information.
626 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
627 FREE_C_HEAP_ARRAY(char, buf);
628 FREE_C_HEAP_ARRAY(char, info);
629 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
630 }
631
632 path = &info->dls_serpath[0];
633
634 // Note: Due to a legacy implementation, most of the library path
635 // is set in the launcher. This was to accomodate linking restrictions
636 // on legacy Solaris implementations (which are no longer supported).
637 // Eventually, all the library path setting will be done here.
638 //
639 // However, to prevent the proliferation of improperly built native
640 // libraries, the new path component /usr/jdk/packages is added here.
641
642 // Construct the invariant part of ld_library_path.
643 sprintf(common_path, SYS_EXT_DIR "/lib");
644
645 // Struct size is more than sufficient for the path components obtained
646 // through the dlinfo() call, so only add additional space for the path
647 // components explicitly added here.
648 size_t library_path_size = info->dls_size + strlen(common_path);
649 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
650 library_path[0] = '\0';
651
652 // Construct the desired Java library path from the linker's library
653 // search path.
654 //
655 // For compatibility, it is optimal that we insert the additional path
656 // components specific to the Java VM after those components specified
657 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
658 // infrastructure.
659 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
660 strcpy(library_path, common_path);
661 } else {
662 int inserted = 0;
663 int i;
664 for (i = 0; i < info->dls_cnt; i++, path++) {
665 uint_t flags = path->dls_flags & LA_SER_MASK;
666 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
667 strcat(library_path, common_path);
668 strcat(library_path, os::path_separator());
669 inserted = 1;
670 }
671 strcat(library_path, path->dls_name);
672 strcat(library_path, os::path_separator());
673 }
674 // Eliminate trailing path separator.
675 library_path[strlen(library_path)-1] = '\0';
676 }
677
678 // happens before argument parsing - can't use a trace flag
679 // tty->print_raw("init_system_properties_values: native lib path: ");
680 // tty->print_raw_cr(library_path);
681
682 // Callee copies into its own buffer.
683 Arguments::set_library_path(library_path);
684
685 FREE_C_HEAP_ARRAY(char, library_path);
686 FREE_C_HEAP_ARRAY(char, info);
687 }
688
689 // Extensions directories.
690 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
691 Arguments::set_ext_dirs(buf);
692
693 FREE_C_HEAP_ARRAY(char, buf);
694
695 #undef SYS_EXT_DIR
696 #undef EXTENSIONS_DIR
697 }
698
699 void os::breakpoint() {
700 BREAKPOINT;
701 }
702
703 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
704 address stackStart = (address)thread->stack_base();
705 address stackEnd = (address)(stackStart - (address)thread->stack_size());
706 if (sp < stackStart && sp >= stackEnd) return true;
707 return false;
708 }
709
710 extern "C" void breakpoint() {
711 // use debugger to set breakpoint here
712 }
713
714 static thread_t main_thread;
715
716 // Thread start routine for all newly created threads
717 extern "C" void* thread_native_entry(void* thread_addr) {
718
719 Thread* thread = (Thread*)thread_addr;
720
721 thread->record_stack_base_and_size();
722
723 // Try to randomize the cache line index of hot stack frames.
724 // This helps when threads of the same stack traces evict each other's
725 // cache lines. The threads can be either from the same JVM instance, or
726 // from different JVM instances. The benefit is especially true for
727 // processors with hyperthreading technology.
728 static int counter = 0;
729 int pid = os::current_process_id();
730 alloca(((pid ^ counter++) & 7) * 128);
731
732 int prio;
733
734 thread->initialize_thread_current();
735
736 OSThread* osthr = thread->osthread();
737
738 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
739
740 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
741 os::current_thread_id());
742
743 if (UseNUMA) {
744 int lgrp_id = os::numa_get_group_id();
745 if (lgrp_id != -1) {
746 thread->set_lgrp_id(lgrp_id);
747 }
748 }
749
750 // Our priority was set when we were created, and stored in the
751 // osthread, but couldn't be passed through to our LWP until now.
752 // So read back the priority and set it again.
753
754 if (osthr->thread_id() != -1) {
755 if (UseThreadPriorities) {
756 int prio = osthr->native_priority();
757 if (ThreadPriorityVerbose) {
758 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
759 INTPTR_FORMAT ", setting priority: %d\n",
760 osthr->thread_id(), osthr->lwp_id(), prio);
761 }
762 os::set_native_priority(thread, prio);
763 }
764 } else if (ThreadPriorityVerbose) {
765 warning("Can't set priority in _start routine, thread id hasn't been set\n");
766 }
767
768 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
769
770 // initialize signal mask for this thread
771 os::Solaris::hotspot_sigmask(thread);
772
773 os::Solaris::init_thread_fpu_state();
774 std::set_terminate(_handle_uncaught_cxx_exception);
775
776 thread->call_run();
777
778 // Note: at this point the thread object may already have deleted itself.
779 // Do not dereference it from here on out.
780
781 // One less thread is executing
782 // When the VMThread gets here, the main thread may have already exited
783 // which frees the CodeHeap containing the Atomic::dec code
784 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
785 Atomic::dec(&os::Solaris::_os_thread_count);
786 }
787
788 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
789
790 if (UseDetachedThreads) {
791 thr_exit(NULL);
792 ShouldNotReachHere();
793 }
794 return NULL;
795 }
796
797 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
798 // Allocate the OSThread object
799 OSThread* osthread = new OSThread(NULL, NULL);
800 if (osthread == NULL) return NULL;
801
802 // Store info on the Solaris thread into the OSThread
803 osthread->set_thread_id(thread_id);
804 osthread->set_lwp_id(_lwp_self());
805
806 if (UseNUMA) {
807 int lgrp_id = os::numa_get_group_id();
808 if (lgrp_id != -1) {
809 thread->set_lgrp_id(lgrp_id);
810 }
811 }
812
813 if (ThreadPriorityVerbose) {
814 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
815 osthread->thread_id(), osthread->lwp_id());
816 }
817
818 // Initial thread state is INITIALIZED, not SUSPENDED
819 osthread->set_state(INITIALIZED);
820
821 return osthread;
822 }
823
824 void os::Solaris::hotspot_sigmask(Thread* thread) {
825 //Save caller's signal mask
826 sigset_t sigmask;
827 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
828 OSThread *osthread = thread->osthread();
829 osthread->set_caller_sigmask(sigmask);
830
831 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
832 if (!ReduceSignalUsage) {
833 if (thread->is_VM_thread()) {
834 // Only the VM thread handles BREAK_SIGNAL ...
835 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
836 } else {
837 // ... all other threads block BREAK_SIGNAL
838 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
839 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
840 }
841 }
842 }
843
844 bool os::create_attached_thread(JavaThread* thread) {
845 #ifdef ASSERT
846 thread->verify_not_published();
847 #endif
848 OSThread* osthread = create_os_thread(thread, thr_self());
849 if (osthread == NULL) {
850 return false;
851 }
852
853 // Initial thread state is RUNNABLE
854 osthread->set_state(RUNNABLE);
855 thread->set_osthread(osthread);
856
857 // initialize signal mask for this thread
858 // and save the caller's signal mask
859 os::Solaris::hotspot_sigmask(thread);
860
861 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
862 os::current_thread_id());
863
864 return true;
865 }
866
867 bool os::create_main_thread(JavaThread* thread) {
868 #ifdef ASSERT
869 thread->verify_not_published();
870 #endif
871 if (_starting_thread == NULL) {
872 _starting_thread = create_os_thread(thread, main_thread);
873 if (_starting_thread == NULL) {
874 return false;
875 }
876 }
877
878 // The primodial thread is runnable from the start
879 _starting_thread->set_state(RUNNABLE);
880
881 thread->set_osthread(_starting_thread);
882
883 // initialize signal mask for this thread
884 // and save the caller's signal mask
885 os::Solaris::hotspot_sigmask(thread);
886
887 return true;
888 }
889
890 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
891 static char* describe_thr_create_attributes(char* buf, size_t buflen,
892 size_t stacksize, long flags) {
893 stringStream ss(buf, buflen);
894 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
895 ss.print("flags: ");
896 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
897 #define ALL(X) \
898 X(THR_SUSPENDED) \
899 X(THR_DETACHED) \
900 X(THR_BOUND) \
901 X(THR_NEW_LWP) \
902 X(THR_DAEMON)
903 ALL(PRINT_FLAG)
904 #undef ALL
905 #undef PRINT_FLAG
906 return buf;
907 }
908
909 // return default stack size for thr_type
910 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
911 // default stack size when not specified by caller is 1M (2M for LP64)
912 size_t s = (BytesPerWord >> 2) * K * K;
913 return s;
914 }
915
916 bool os::create_thread(Thread* thread, ThreadType thr_type,
917 size_t req_stack_size) {
918 // Allocate the OSThread object
919 OSThread* osthread = new OSThread(NULL, NULL);
920 if (osthread == NULL) {
921 return false;
922 }
923
924 if (ThreadPriorityVerbose) {
925 char *thrtyp;
926 switch (thr_type) {
927 case vm_thread:
928 thrtyp = (char *)"vm";
929 break;
930 case cgc_thread:
931 thrtyp = (char *)"cgc";
932 break;
933 case pgc_thread:
934 thrtyp = (char *)"pgc";
935 break;
936 case java_thread:
937 thrtyp = (char *)"java";
938 break;
939 case compiler_thread:
940 thrtyp = (char *)"compiler";
941 break;
942 case watcher_thread:
943 thrtyp = (char *)"watcher";
944 break;
945 default:
946 thrtyp = (char *)"unknown";
947 break;
948 }
949 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
950 }
951
952 // calculate stack size if it's not specified by caller
953 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
954
955 // Initial state is ALLOCATED but not INITIALIZED
956 osthread->set_state(ALLOCATED);
957
958 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
959 // We got lots of threads. Check if we still have some address space left.
960 // Need to be at least 5Mb of unreserved address space. We do check by
961 // trying to reserve some.
962 const size_t VirtualMemoryBangSize = 20*K*K;
963 char* mem = os::reserve_memory(VirtualMemoryBangSize);
964 if (mem == NULL) {
965 delete osthread;
966 return false;
967 } else {
968 // Release the memory again
969 os::release_memory(mem, VirtualMemoryBangSize);
970 }
971 }
972
973 // Setup osthread because the child thread may need it.
974 thread->set_osthread(osthread);
975
976 // Create the Solaris thread
977 thread_t tid = 0;
978 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
979 int status;
980
981 // Mark that we don't have an lwp or thread id yet.
982 // In case we attempt to set the priority before the thread starts.
983 osthread->set_lwp_id(-1);
984 osthread->set_thread_id(-1);
985
986 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
987
988 char buf[64];
989 if (status == 0) {
990 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
991 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
992 } else {
993 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
994 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
995 }
996
997 if (status != 0) {
998 thread->set_osthread(NULL);
999 // Need to clean up stuff we've allocated so far
1000 delete osthread;
1001 return false;
1002 }
1003
1004 Atomic::inc(&os::Solaris::_os_thread_count);
1005
1006 // Store info on the Solaris thread into the OSThread
1007 osthread->set_thread_id(tid);
1008
1009 // Remember that we created this thread so we can set priority on it
1010 osthread->set_vm_created();
1011
1012 // Most thread types will set an explicit priority before starting the thread,
1013 // but for those that don't we need a valid value to read back in thread_native_entry.
1014 osthread->set_native_priority(NormPriority);
1015
1016 // Initial thread state is INITIALIZED, not SUSPENDED
1017 osthread->set_state(INITIALIZED);
1018
1019 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1020 return true;
1021 }
1022
1023 debug_only(static bool signal_sets_initialized = false);
1024 static sigset_t unblocked_sigs, vm_sigs;
1025
1026 void os::Solaris::signal_sets_init() {
1027 // Should also have an assertion stating we are still single-threaded.
1028 assert(!signal_sets_initialized, "Already initialized");
1029 // Fill in signals that are necessarily unblocked for all threads in
1030 // the VM. Currently, we unblock the following signals:
1031 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1032 // by -Xrs (=ReduceSignalUsage));
1033 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1034 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1035 // the dispositions or masks wrt these signals.
1036 // Programs embedding the VM that want to use the above signals for their
1037 // own purposes must, at this time, use the "-Xrs" option to prevent
1038 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1039 // (See bug 4345157, and other related bugs).
1040 // In reality, though, unblocking these signals is really a nop, since
1041 // these signals are not blocked by default.
1042 sigemptyset(&unblocked_sigs);
1043 sigaddset(&unblocked_sigs, SIGILL);
1044 sigaddset(&unblocked_sigs, SIGSEGV);
1045 sigaddset(&unblocked_sigs, SIGBUS);
1046 sigaddset(&unblocked_sigs, SIGFPE);
1047 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1048
1049 if (!ReduceSignalUsage) {
1050 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1051 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1052 }
1053 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1054 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1055 }
1056 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1057 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1058 }
1059 }
1060 // Fill in signals that are blocked by all but the VM thread.
1061 sigemptyset(&vm_sigs);
1062 if (!ReduceSignalUsage) {
1063 sigaddset(&vm_sigs, BREAK_SIGNAL);
1064 }
1065 debug_only(signal_sets_initialized = true);
1066
1067 // For diagnostics only used in run_periodic_checks
1068 sigemptyset(&check_signal_done);
1069 }
1070
1071 // These are signals that are unblocked while a thread is running Java.
1072 // (For some reason, they get blocked by default.)
1073 sigset_t* os::Solaris::unblocked_signals() {
1074 assert(signal_sets_initialized, "Not initialized");
1075 return &unblocked_sigs;
1076 }
1077
1078 // These are the signals that are blocked while a (non-VM) thread is
1079 // running Java. Only the VM thread handles these signals.
1080 sigset_t* os::Solaris::vm_signals() {
1081 assert(signal_sets_initialized, "Not initialized");
1082 return &vm_sigs;
1083 }
1084
1085 // CR 7190089: on Solaris, primordial thread's stack needs adjusting.
1086 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited).
1087 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) {
1088 assert(is_primordial_thread(), "Call only for primordial thread");
1089
1090 JavaThread* jt = (JavaThread *)thr;
1091 assert(jt != NULL, "Sanity check");
1092 size_t stack_size;
1093 address base = jt->stack_base();
1094 if (Arguments::created_by_java_launcher()) {
1095 // Use 2MB to allow for Solaris 7 64 bit mode.
1096 stack_size = JavaThread::stack_size_at_create() == 0
1097 ? 2048*K : JavaThread::stack_size_at_create();
1098
1099 // There are rare cases when we may have already used more than
1100 // the basic stack size allotment before this method is invoked.
1101 // Attempt to allow for a normally sized java_stack.
1102 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1103 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1104 } else {
1105 // 6269555: If we were not created by a Java launcher, i.e. if we are
1106 // running embedded in a native application, treat the primordial thread
1107 // as much like a native attached thread as possible. This means using
1108 // the current stack size from thr_stksegment(), unless it is too large
1109 // to reliably setup guard pages. A reasonable max size is 8MB.
1110 size_t current_size = os::current_stack_size();
1111 // This should never happen, but just in case....
1112 if (current_size == 0) current_size = 2 * K * K;
1113 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1114 }
1115 address bottom = align_up(base - stack_size, os::vm_page_size());;
1116 stack_size = (size_t)(base - bottom);
1117
1118 assert(stack_size > 0, "Stack size calculation problem");
1119
1120 if (stack_size > jt->stack_size()) {
1121 #ifndef PRODUCT
1122 struct rlimit limits;
1123 getrlimit(RLIMIT_STACK, &limits);
1124 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1125 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1126 #endif
1127 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1128 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1129 "See limit(1) to increase the stack size limit.",
1130 stack_size / K, jt->stack_size() / K);
1131 vm_exit(1);
1132 }
1133 assert(jt->stack_size() >= stack_size,
1134 "Attempt to map more stack than was allocated");
1135 jt->set_stack_size(stack_size);
1136
1137 }
1138
1139
1140
1141 // Free Solaris resources related to the OSThread
1142 void os::free_thread(OSThread* osthread) {
1143 assert(osthread != NULL, "os::free_thread but osthread not set");
1144
1145 // We are told to free resources of the argument thread,
1146 // but we can only really operate on the current thread.
1147 assert(Thread::current()->osthread() == osthread,
1148 "os::free_thread but not current thread");
1149
1150 // Restore caller's signal mask
1151 sigset_t sigmask = osthread->caller_sigmask();
1152 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1153
1154 delete osthread;
1155 }
1156
1157 void os::pd_start_thread(Thread* thread) {
1158 int status = thr_continue(thread->osthread()->thread_id());
1159 assert_status(status == 0, status, "thr_continue failed");
1160 }
1161
1162
1163 intx os::current_thread_id() {
1164 return (intx)thr_self();
1165 }
1166
1167 static pid_t _initial_pid = 0;
1168
1169 int os::current_process_id() {
1170 return (int)(_initial_pid ? _initial_pid : getpid());
1171 }
1172
1173 // gethrtime() should be monotonic according to the documentation,
1174 // but some virtualized platforms are known to break this guarantee.
1175 // getTimeNanos() must be guaranteed not to move backwards, so we
1176 // are forced to add a check here.
1177 inline hrtime_t getTimeNanos() {
1178 const hrtime_t now = gethrtime();
1179 const hrtime_t prev = max_hrtime;
1180 if (now <= prev) {
1181 return prev; // same or retrograde time;
1182 }
1183 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev);
1184 assert(obsv >= prev, "invariant"); // Monotonicity
1185 // If the CAS succeeded then we're done and return "now".
1186 // If the CAS failed and the observed value "obsv" is >= now then
1187 // we should return "obsv". If the CAS failed and now > obsv > prv then
1188 // some other thread raced this thread and installed a new value, in which case
1189 // we could either (a) retry the entire operation, (b) retry trying to install now
1190 // or (c) just return obsv. We use (c). No loop is required although in some cases
1191 // we might discard a higher "now" value in deference to a slightly lower but freshly
1192 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1193 // to (a) or (b) -- and greatly reduces coherence traffic.
1194 // We might also condition (c) on the magnitude of the delta between obsv and now.
1195 // Avoiding excessive CAS operations to hot RW locations is critical.
1196 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1197 return (prev == obsv) ? now : obsv;
1198 }
1199
1200 // Time since start-up in seconds to a fine granularity.
1201 // Used by VMSelfDestructTimer and the MemProfiler.
1202 double os::elapsedTime() {
1203 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1204 }
1205
1206 jlong os::elapsed_counter() {
1207 return (jlong)(getTimeNanos() - first_hrtime);
1208 }
1209
1210 jlong os::elapsed_frequency() {
1211 return hrtime_hz;
1212 }
1213
1214 // Return the real, user, and system times in seconds from an
1215 // arbitrary fixed point in the past.
1216 bool os::getTimesSecs(double* process_real_time,
1217 double* process_user_time,
1218 double* process_system_time) {
1219 struct tms ticks;
1220 clock_t real_ticks = times(&ticks);
1221
1222 if (real_ticks == (clock_t) (-1)) {
1223 return false;
1224 } else {
1225 double ticks_per_second = (double) clock_tics_per_sec;
1226 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1227 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1228 // For consistency return the real time from getTimeNanos()
1229 // converted to seconds.
1230 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1231
1232 return true;
1233 }
1234 }
1235
1236 bool os::supports_vtime() { return true; }
1237 bool os::enable_vtime() { return false; }
1238 bool os::vtime_enabled() { return false; }
1239
1240 double os::elapsedVTime() {
1241 return (double)gethrvtime() / (double)hrtime_hz;
1242 }
1243
1244 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1245 jlong os::javaTimeMillis() {
1246 timeval t;
1247 if (gettimeofday(&t, NULL) == -1) {
1248 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1249 }
1250 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1251 }
1252
1253 // Must return seconds+nanos since Jan 1 1970. This must use the same
1254 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1255 // we need better than 1ms accuracy
1256 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1257 timeval t;
1258 if (gettimeofday(&t, NULL) == -1) {
1259 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1260 }
1261 seconds = jlong(t.tv_sec);
1262 nanos = jlong(t.tv_usec) * 1000;
1263 }
1264
1265
1266 jlong os::javaTimeNanos() {
1267 return (jlong)getTimeNanos();
1268 }
1269
1270 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1271 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1272 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1273 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1274 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1275 }
1276
1277 char * os::local_time_string(char *buf, size_t buflen) {
1278 struct tm t;
1279 time_t long_time;
1280 time(&long_time);
1281 localtime_r(&long_time, &t);
1282 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1283 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1284 t.tm_hour, t.tm_min, t.tm_sec);
1285 return buf;
1286 }
1287
1288 // Note: os::shutdown() might be called very early during initialization, or
1289 // called from signal handler. Before adding something to os::shutdown(), make
1290 // sure it is async-safe and can handle partially initialized VM.
1291 void os::shutdown() {
1292
1293 // allow PerfMemory to attempt cleanup of any persistent resources
1294 perfMemory_exit();
1295
1296 // needs to remove object in file system
1297 AttachListener::abort();
1298
1299 // flush buffered output, finish log files
1300 ostream_abort();
1301
1302 // Check for abort hook
1303 abort_hook_t abort_hook = Arguments::abort_hook();
1304 if (abort_hook != NULL) {
1305 abort_hook();
1306 }
1307 }
1308
1309 // Note: os::abort() might be called very early during initialization, or
1310 // called from signal handler. Before adding something to os::abort(), make
1311 // sure it is async-safe and can handle partially initialized VM.
1312 void os::abort(bool dump_core, void* siginfo, const void* context) {
1313 os::shutdown();
1314 if (dump_core) {
1315 #ifndef PRODUCT
1316 fdStream out(defaultStream::output_fd());
1317 out.print_raw("Current thread is ");
1318 char buf[16];
1319 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1320 out.print_raw_cr(buf);
1321 out.print_raw_cr("Dumping core ...");
1322 #endif
1323 ::abort(); // dump core (for debugging)
1324 }
1325
1326 ::exit(1);
1327 }
1328
1329 // Die immediately, no exit hook, no abort hook, no cleanup.
1330 void os::die() {
1331 ::abort(); // dump core (for debugging)
1332 }
1333
1334 // DLL functions
1335
1336 const char* os::dll_file_extension() { return ".so"; }
1337
1338 // This must be hard coded because it's the system's temporary
1339 // directory not the java application's temp directory, ala java.io.tmpdir.
1340 const char* os::get_temp_directory() { return "/tmp"; }
1341
1342 // check if addr is inside libjvm.so
1343 bool os::address_is_in_vm(address addr) {
1344 static address libjvm_base_addr;
1345 Dl_info dlinfo;
1346
1347 if (libjvm_base_addr == NULL) {
1348 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1349 libjvm_base_addr = (address)dlinfo.dli_fbase;
1350 }
1351 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1352 }
1353
1354 if (dladdr((void *)addr, &dlinfo) != 0) {
1355 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1356 }
1357
1358 return false;
1359 }
1360
1361 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1362 static dladdr1_func_type dladdr1_func = NULL;
1363
1364 bool os::dll_address_to_function_name(address addr, char *buf,
1365 int buflen, int * offset,
1366 bool demangle) {
1367 // buf is not optional, but offset is optional
1368 assert(buf != NULL, "sanity check");
1369
1370 Dl_info dlinfo;
1371
1372 // dladdr1_func was initialized in os::init()
1373 if (dladdr1_func != NULL) {
1374 // yes, we have dladdr1
1375
1376 // Support for dladdr1 is checked at runtime; it may be
1377 // available even if the vm is built on a machine that does
1378 // not have dladdr1 support. Make sure there is a value for
1379 // RTLD_DL_SYMENT.
1380 #ifndef RTLD_DL_SYMENT
1381 #define RTLD_DL_SYMENT 1
1382 #endif
1383 #ifdef _LP64
1384 Elf64_Sym * info;
1385 #else
1386 Elf32_Sym * info;
1387 #endif
1388 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1389 RTLD_DL_SYMENT) != 0) {
1390 // see if we have a matching symbol that covers our address
1391 if (dlinfo.dli_saddr != NULL &&
1392 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1393 if (dlinfo.dli_sname != NULL) {
1394 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1395 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1396 }
1397 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1398 return true;
1399 }
1400 }
1401 // no matching symbol so try for just file info
1402 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1403 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1404 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1405 return true;
1406 }
1407 }
1408 }
1409 buf[0] = '\0';
1410 if (offset != NULL) *offset = -1;
1411 return false;
1412 }
1413
1414 // no, only dladdr is available
1415 if (dladdr((void *)addr, &dlinfo) != 0) {
1416 // see if we have a matching symbol
1417 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1418 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1419 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1420 }
1421 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1422 return true;
1423 }
1424 // no matching symbol so try for just file info
1425 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1426 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1427 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1428 return true;
1429 }
1430 }
1431 }
1432 buf[0] = '\0';
1433 if (offset != NULL) *offset = -1;
1434 return false;
1435 }
1436
1437 bool os::dll_address_to_library_name(address addr, char* buf,
1438 int buflen, int* offset) {
1439 // buf is not optional, but offset is optional
1440 assert(buf != NULL, "sanity check");
1441
1442 Dl_info dlinfo;
1443
1444 if (dladdr((void*)addr, &dlinfo) != 0) {
1445 if (dlinfo.dli_fname != NULL) {
1446 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1447 }
1448 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1449 *offset = addr - (address)dlinfo.dli_fbase;
1450 }
1451 return true;
1452 }
1453
1454 buf[0] = '\0';
1455 if (offset) *offset = -1;
1456 return false;
1457 }
1458
1459 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1460 Dl_info dli;
1461 // Sanity check?
1462 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1463 dli.dli_fname == NULL) {
1464 return 1;
1465 }
1466
1467 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1468 if (handle == NULL) {
1469 return 1;
1470 }
1471
1472 Link_map *map;
1473 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1474 if (map == NULL) {
1475 dlclose(handle);
1476 return 1;
1477 }
1478
1479 while (map->l_prev != NULL) {
1480 map = map->l_prev;
1481 }
1482
1483 while (map != NULL) {
1484 // Iterate through all map entries and call callback with fields of interest
1485 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1486 dlclose(handle);
1487 return 1;
1488 }
1489 map = map->l_next;
1490 }
1491
1492 dlclose(handle);
1493 return 0;
1494 }
1495
1496 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1497 outputStream * out = (outputStream *) param;
1498 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1499 return 0;
1500 }
1501
1502 void os::print_dll_info(outputStream * st) {
1503 st->print_cr("Dynamic libraries:"); st->flush();
1504 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1505 st->print_cr("Error: Cannot print dynamic libraries.");
1506 }
1507 }
1508
1509 // Loads .dll/.so and
1510 // in case of error it checks if .dll/.so was built for the
1511 // same architecture as Hotspot is running on
1512
1513 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1514 void * result= ::dlopen(filename, RTLD_LAZY);
1515 if (result != NULL) {
1516 // Successful loading
1517 return result;
1518 }
1519
1520 Elf32_Ehdr elf_head;
1521
1522 // Read system error message into ebuf
1523 // It may or may not be overwritten below
1524 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1525 ebuf[ebuflen-1]='\0';
1526 int diag_msg_max_length=ebuflen-strlen(ebuf);
1527 char* diag_msg_buf=ebuf+strlen(ebuf);
1528
1529 if (diag_msg_max_length==0) {
1530 // No more space in ebuf for additional diagnostics message
1531 return NULL;
1532 }
1533
1534
1535 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1536
1537 if (file_descriptor < 0) {
1538 // Can't open library, report dlerror() message
1539 return NULL;
1540 }
1541
1542 bool failed_to_read_elf_head=
1543 (sizeof(elf_head)!=
1544 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1545
1546 ::close(file_descriptor);
1547 if (failed_to_read_elf_head) {
1548 // file i/o error - report dlerror() msg
1549 return NULL;
1550 }
1551
1552 typedef struct {
1553 Elf32_Half code; // Actual value as defined in elf.h
1554 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1555 unsigned char elf_class; // 32 or 64 bit
1556 unsigned char endianess; // MSB or LSB
1557 char* name; // String representation
1558 } arch_t;
1559
1560 static const arch_t arch_array[]={
1561 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1562 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1563 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1564 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1565 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1566 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1567 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1568 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1569 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1570 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1571 };
1572
1573 #if (defined IA32)
1574 static Elf32_Half running_arch_code=EM_386;
1575 #elif (defined AMD64)
1576 static Elf32_Half running_arch_code=EM_X86_64;
1577 #elif (defined IA64)
1578 static Elf32_Half running_arch_code=EM_IA_64;
1579 #elif (defined __sparc) && (defined _LP64)
1580 static Elf32_Half running_arch_code=EM_SPARCV9;
1581 #elif (defined __sparc) && (!defined _LP64)
1582 static Elf32_Half running_arch_code=EM_SPARC;
1583 #elif (defined __powerpc64__)
1584 static Elf32_Half running_arch_code=EM_PPC64;
1585 #elif (defined __powerpc__)
1586 static Elf32_Half running_arch_code=EM_PPC;
1587 #elif (defined ARM)
1588 static Elf32_Half running_arch_code=EM_ARM;
1589 #else
1590 #error Method os::dll_load requires that one of following is defined:\
1591 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1592 #endif
1593
1594 // Identify compatability class for VM's architecture and library's architecture
1595 // Obtain string descriptions for architectures
1596
1597 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1598 int running_arch_index=-1;
1599
1600 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1601 if (running_arch_code == arch_array[i].code) {
1602 running_arch_index = i;
1603 }
1604 if (lib_arch.code == arch_array[i].code) {
1605 lib_arch.compat_class = arch_array[i].compat_class;
1606 lib_arch.name = arch_array[i].name;
1607 }
1608 }
1609
1610 assert(running_arch_index != -1,
1611 "Didn't find running architecture code (running_arch_code) in arch_array");
1612 if (running_arch_index == -1) {
1613 // Even though running architecture detection failed
1614 // we may still continue with reporting dlerror() message
1615 return NULL;
1616 }
1617
1618 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1619 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1620 return NULL;
1621 }
1622
1623 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1624 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1625 return NULL;
1626 }
1627
1628 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1629 if (lib_arch.name!=NULL) {
1630 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1631 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1632 lib_arch.name, arch_array[running_arch_index].name);
1633 } else {
1634 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1635 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1636 lib_arch.code,
1637 arch_array[running_arch_index].name);
1638 }
1639 }
1640
1641 return NULL;
1642 }
1643
1644 void* os::dll_lookup(void* handle, const char* name) {
1645 return dlsym(handle, name);
1646 }
1647
1648 void* os::get_default_process_handle() {
1649 return (void*)::dlopen(NULL, RTLD_LAZY);
1650 }
1651
1652 static inline time_t get_mtime(const char* filename) {
1653 struct stat st;
1654 int ret = os::stat(filename, &st);
1655 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1656 return st.st_mtime;
1657 }
1658
1659 int os::compare_file_modified_times(const char* file1, const char* file2) {
1660 time_t t1 = get_mtime(file1);
1661 time_t t2 = get_mtime(file2);
1662 return t1 - t2;
1663 }
1664
1665 static bool _print_ascii_file(const char* filename, outputStream* st) {
1666 int fd = ::open(filename, O_RDONLY);
1667 if (fd == -1) {
1668 return false;
1669 }
1670
1671 char buf[32];
1672 int bytes;
1673 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1674 st->print_raw(buf, bytes);
1675 }
1676
1677 ::close(fd);
1678
1679 return true;
1680 }
1681
1682 void os::print_os_info_brief(outputStream* st) {
1683 os::Solaris::print_distro_info(st);
1684
1685 os::Posix::print_uname_info(st);
1686
1687 os::Solaris::print_libversion_info(st);
1688 }
1689
1690 void os::print_os_info(outputStream* st) {
1691 st->print("OS:");
1692
1693 os::Solaris::print_distro_info(st);
1694
1695 os::Posix::print_uname_info(st);
1696
1697 os::Solaris::print_libversion_info(st);
1698
1699 os::Posix::print_rlimit_info(st);
1700
1701 os::Posix::print_load_average(st);
1702 }
1703
1704 void os::Solaris::print_distro_info(outputStream* st) {
1705 if (!_print_ascii_file("/etc/release", st)) {
1706 st->print("Solaris");
1707 }
1708 st->cr();
1709 }
1710
1711 void os::get_summary_os_info(char* buf, size_t buflen) {
1712 strncpy(buf, "Solaris", buflen); // default to plain solaris
1713 FILE* fp = fopen("/etc/release", "r");
1714 if (fp != NULL) {
1715 char tmp[256];
1716 // Only get the first line and chop out everything but the os name.
1717 if (fgets(tmp, sizeof(tmp), fp)) {
1718 char* ptr = tmp;
1719 // skip past whitespace characters
1720 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1721 if (*ptr != '\0') {
1722 char* nl = strchr(ptr, '\n');
1723 if (nl != NULL) *nl = '\0';
1724 strncpy(buf, ptr, buflen);
1725 }
1726 }
1727 fclose(fp);
1728 }
1729 }
1730
1731 void os::Solaris::print_libversion_info(outputStream* st) {
1732 st->print(" (T2 libthread)");
1733 st->cr();
1734 }
1735
1736 static bool check_addr0(outputStream* st) {
1737 jboolean status = false;
1738 const int read_chunk = 200;
1739 int ret = 0;
1740 int nmap = 0;
1741 int fd = ::open("/proc/self/map",O_RDONLY);
1742 if (fd >= 0) {
1743 prmap_t *p = NULL;
1744 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1745 if (NULL == mbuff) {
1746 ::close(fd);
1747 return status;
1748 }
1749 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1750 //check if read() has not read partial data
1751 if( 0 != ret % sizeof(prmap_t)){
1752 break;
1753 }
1754 nmap = ret / sizeof(prmap_t);
1755 p = (prmap_t *)mbuff;
1756 for(int i = 0; i < nmap; i++){
1757 if (p->pr_vaddr == 0x0) {
1758 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1759 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1760 st->print("Access: ");
1761 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1762 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1763 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1764 st->cr();
1765 status = true;
1766 }
1767 p++;
1768 }
1769 }
1770 free(mbuff);
1771 ::close(fd);
1772 }
1773 return status;
1774 }
1775
1776 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1777 // Get MHz with system call. We don't seem to already have this.
1778 processor_info_t stats;
1779 processorid_t id = getcpuid();
1780 int clock = 0;
1781 if (processor_info(id, &stats) != -1) {
1782 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1783 }
1784 #ifdef AMD64
1785 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1786 #else
1787 // must be sparc
1788 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1789 #endif
1790 }
1791
1792 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1793 // Nothing to do for now.
1794 }
1795
1796 void os::print_memory_info(outputStream* st) {
1797 st->print("Memory:");
1798 st->print(" %dk page", os::vm_page_size()>>10);
1799 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1800 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1801 st->cr();
1802 (void) check_addr0(st);
1803 }
1804
1805 // Moved from whole group, because we need them here for diagnostic
1806 // prints.
1807 static int Maxsignum = 0;
1808 static int *ourSigFlags = NULL;
1809
1810 int os::Solaris::get_our_sigflags(int sig) {
1811 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1812 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1813 return ourSigFlags[sig];
1814 }
1815
1816 void os::Solaris::set_our_sigflags(int sig, int flags) {
1817 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1818 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1819 ourSigFlags[sig] = flags;
1820 }
1821
1822
1823 static const char* get_signal_handler_name(address handler,
1824 char* buf, int buflen) {
1825 int offset;
1826 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1827 if (found) {
1828 // skip directory names
1829 const char *p1, *p2;
1830 p1 = buf;
1831 size_t len = strlen(os::file_separator());
1832 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1833 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1834 } else {
1835 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1836 }
1837 return buf;
1838 }
1839
1840 static void print_signal_handler(outputStream* st, int sig,
1841 char* buf, size_t buflen) {
1842 struct sigaction sa;
1843
1844 sigaction(sig, NULL, &sa);
1845
1846 st->print("%s: ", os::exception_name(sig, buf, buflen));
1847
1848 address handler = (sa.sa_flags & SA_SIGINFO)
1849 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1850 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1851
1852 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1853 st->print("SIG_DFL");
1854 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1855 st->print("SIG_IGN");
1856 } else {
1857 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1858 }
1859
1860 st->print(", sa_mask[0]=");
1861 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1862
1863 address rh = VMError::get_resetted_sighandler(sig);
1864 // May be, handler was resetted by VMError?
1865 if (rh != NULL) {
1866 handler = rh;
1867 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1868 }
1869
1870 st->print(", sa_flags=");
1871 os::Posix::print_sa_flags(st, sa.sa_flags);
1872
1873 // Check: is it our handler?
1874 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1875 // It is our signal handler
1876 // check for flags
1877 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1878 st->print(
1879 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1880 os::Solaris::get_our_sigflags(sig));
1881 }
1882 }
1883 st->cr();
1884 }
1885
1886 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1887 st->print_cr("Signal Handlers:");
1888 print_signal_handler(st, SIGSEGV, buf, buflen);
1889 print_signal_handler(st, SIGBUS , buf, buflen);
1890 print_signal_handler(st, SIGFPE , buf, buflen);
1891 print_signal_handler(st, SIGPIPE, buf, buflen);
1892 print_signal_handler(st, SIGXFSZ, buf, buflen);
1893 print_signal_handler(st, SIGILL , buf, buflen);
1894 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1895 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1896 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1897 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1898 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1899 }
1900
1901 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1902
1903 // Find the full path to the current module, libjvm.so
1904 void os::jvm_path(char *buf, jint buflen) {
1905 // Error checking.
1906 if (buflen < MAXPATHLEN) {
1907 assert(false, "must use a large-enough buffer");
1908 buf[0] = '\0';
1909 return;
1910 }
1911 // Lazy resolve the path to current module.
1912 if (saved_jvm_path[0] != 0) {
1913 strcpy(buf, saved_jvm_path);
1914 return;
1915 }
1916
1917 Dl_info dlinfo;
1918 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1919 assert(ret != 0, "cannot locate libjvm");
1920 if (ret != 0 && dlinfo.dli_fname != NULL) {
1921 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1922 return;
1923 }
1924 } else {
1925 buf[0] = '\0';
1926 return;
1927 }
1928
1929 if (Arguments::sun_java_launcher_is_altjvm()) {
1930 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1931 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1932 // If "/jre/lib/" appears at the right place in the string, then
1933 // assume we are installed in a JDK and we're done. Otherwise, check
1934 // for a JAVA_HOME environment variable and fix up the path so it
1935 // looks like libjvm.so is installed there (append a fake suffix
1936 // hotspot/libjvm.so).
1937 const char *p = buf + strlen(buf) - 1;
1938 for (int count = 0; p > buf && count < 5; ++count) {
1939 for (--p; p > buf && *p != '/'; --p)
1940 /* empty */ ;
1941 }
1942
1943 if (strncmp(p, "/jre/lib/", 9) != 0) {
1944 // Look for JAVA_HOME in the environment.
1945 char* java_home_var = ::getenv("JAVA_HOME");
1946 if (java_home_var != NULL && java_home_var[0] != 0) {
1947 char* jrelib_p;
1948 int len;
1949
1950 // Check the current module name "libjvm.so".
1951 p = strrchr(buf, '/');
1952 assert(strstr(p, "/libjvm") == p, "invalid library name");
1953
1954 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
1955 return;
1956 }
1957 // determine if this is a legacy image or modules image
1958 // modules image doesn't have "jre" subdirectory
1959 len = strlen(buf);
1960 assert(len < buflen, "Ran out of buffer space");
1961 jrelib_p = buf + len;
1962 snprintf(jrelib_p, buflen-len, "/jre/lib");
1963 if (0 != access(buf, F_OK)) {
1964 snprintf(jrelib_p, buflen-len, "/lib");
1965 }
1966
1967 if (0 == access(buf, F_OK)) {
1968 // Use current module name "libjvm.so"
1969 len = strlen(buf);
1970 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1971 } else {
1972 // Go back to path of .so
1973 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1974 return;
1975 }
1976 }
1977 }
1978 }
1979 }
1980
1981 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1982 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1983 }
1984
1985
1986 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1987 // no prefix required, not even "_"
1988 }
1989
1990
1991 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1992 // no suffix required
1993 }
1994
1995 // sun.misc.Signal
1996
1997 extern "C" {
1998 static void UserHandler(int sig, void *siginfo, void *context) {
1999 // Ctrl-C is pressed during error reporting, likely because the error
2000 // handler fails to abort. Let VM die immediately.
2001 if (sig == SIGINT && VMError::is_error_reported()) {
2002 os::die();
2003 }
2004
2005 os::signal_notify(sig);
2006 // We do not need to reinstate the signal handler each time...
2007 }
2008 }
2009
2010 void* os::user_handler() {
2011 return CAST_FROM_FN_PTR(void*, UserHandler);
2012 }
2013
2014 extern "C" {
2015 typedef void (*sa_handler_t)(int);
2016 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2017 }
2018
2019 void* os::signal(int signal_number, void* handler) {
2020 struct sigaction sigAct, oldSigAct;
2021 sigfillset(&(sigAct.sa_mask));
2022 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2023 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2024
2025 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2026 // -1 means registration failed
2027 return (void *)-1;
2028 }
2029
2030 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2031 }
2032
2033 void os::signal_raise(int signal_number) {
2034 raise(signal_number);
2035 }
2036
2037 // The following code is moved from os.cpp for making this
2038 // code platform specific, which it is by its very nature.
2039
2040 // a counter for each possible signal value
2041 static int Sigexit = 0;
2042 static jint *pending_signals = NULL;
2043 static Semaphore* sig_sem = NULL;
2044
2045 int os::sigexitnum_pd() {
2046 assert(Sigexit > 0, "signal memory not yet initialized");
2047 return Sigexit;
2048 }
2049
2050 void os::Solaris::init_signal_mem() {
2051 // Initialize signal structures
2052 Maxsignum = SIGRTMAX;
2053 Sigexit = Maxsignum+1;
2054 assert(Maxsignum >0, "Unable to obtain max signal number");
2055
2056 // Initialize signal structures
2057 // pending_signals has one int per signal
2058 // The additional signal is for SIGEXIT - exit signal to signal_thread
2059 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2060 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2061
2062 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2063 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2064 }
2065
2066 static void jdk_misc_signal_init() {
2067 // Initialize signal semaphore
2068 sig_sem = new Semaphore();
2069 }
2070
2071 void os::signal_notify(int sig) {
2072 if (sig_sem != NULL) {
2073 Atomic::inc(&pending_signals[sig]);
2074 sig_sem->signal();
2075 } else {
2076 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
2077 // initialization isn't called.
2078 assert(ReduceSignalUsage, "signal semaphore should be created");
2079 }
2080 }
2081
2082 static int check_pending_signals() {
2083 int ret;
2084 while (true) {
2085 for (int i = 0; i < Sigexit + 1; i++) {
2086 jint n = pending_signals[i];
2087 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2088 return i;
2089 }
2090 }
2091 JavaThread *thread = JavaThread::current();
2092 ThreadBlockInVM tbivm(thread);
2093
2094 bool threadIsSuspended;
2095 do {
2096 thread->set_suspend_equivalent();
2097 sig_sem->wait();
2098
2099 // were we externally suspended while we were waiting?
2100 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2101 if (threadIsSuspended) {
2102 // The semaphore has been incremented, but while we were waiting
2103 // another thread suspended us. We don't want to continue running
2104 // while suspended because that would surprise the thread that
2105 // suspended us.
2106 sig_sem->signal();
2107
2108 thread->java_suspend_self();
2109 }
2110 } while (threadIsSuspended);
2111 }
2112 }
2113
2114 int os::signal_wait() {
2115 return check_pending_signals();
2116 }
2117
2118 ////////////////////////////////////////////////////////////////////////////////
2119 // Virtual Memory
2120
2121 static int page_size = -1;
2122
2123 int os::vm_page_size() {
2124 assert(page_size != -1, "must call os::init");
2125 return page_size;
2126 }
2127
2128 // Solaris allocates memory by pages.
2129 int os::vm_allocation_granularity() {
2130 assert(page_size != -1, "must call os::init");
2131 return page_size;
2132 }
2133
2134 static bool recoverable_mmap_error(int err) {
2135 // See if the error is one we can let the caller handle. This
2136 // list of errno values comes from the Solaris mmap(2) man page.
2137 switch (err) {
2138 case EBADF:
2139 case EINVAL:
2140 case ENOTSUP:
2141 // let the caller deal with these errors
2142 return true;
2143
2144 default:
2145 // Any remaining errors on this OS can cause our reserved mapping
2146 // to be lost. That can cause confusion where different data
2147 // structures think they have the same memory mapped. The worst
2148 // scenario is if both the VM and a library think they have the
2149 // same memory mapped.
2150 return false;
2151 }
2152 }
2153
2154 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2155 int err) {
2156 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2157 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2158 os::strerror(err), err);
2159 }
2160
2161 static void warn_fail_commit_memory(char* addr, size_t bytes,
2162 size_t alignment_hint, bool exec,
2163 int err) {
2164 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2165 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2166 alignment_hint, exec, os::strerror(err), err);
2167 }
2168
2169 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2170 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2171 size_t size = bytes;
2172 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2173 if (res != NULL) {
2174 if (UseNUMAInterleaving) {
2175 numa_make_global(addr, bytes);
2176 }
2177 return 0;
2178 }
2179
2180 int err = errno; // save errno from mmap() call in mmap_chunk()
2181
2182 if (!recoverable_mmap_error(err)) {
2183 warn_fail_commit_memory(addr, bytes, exec, err);
2184 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2185 }
2186
2187 return err;
2188 }
2189
2190 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2191 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2192 }
2193
2194 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2195 const char* mesg) {
2196 assert(mesg != NULL, "mesg must be specified");
2197 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2198 if (err != 0) {
2199 // the caller wants all commit errors to exit with the specified mesg:
2200 warn_fail_commit_memory(addr, bytes, exec, err);
2201 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2202 }
2203 }
2204
2205 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2206 assert(is_aligned(alignment, (size_t) vm_page_size()),
2207 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2208 alignment, (size_t) vm_page_size());
2209
2210 for (int i = 0; _page_sizes[i] != 0; i++) {
2211 if (is_aligned(alignment, _page_sizes[i])) {
2212 return _page_sizes[i];
2213 }
2214 }
2215
2216 return (size_t) vm_page_size();
2217 }
2218
2219 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2220 size_t alignment_hint, bool exec) {
2221 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2222 if (err == 0 && UseLargePages && alignment_hint > 0) {
2223 assert(is_aligned(bytes, alignment_hint),
2224 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2225
2226 // The syscall memcntl requires an exact page size (see man memcntl for details).
2227 size_t page_size = page_size_for_alignment(alignment_hint);
2228 if (page_size > (size_t) vm_page_size()) {
2229 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2230 }
2231 }
2232 return err;
2233 }
2234
2235 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2236 bool exec) {
2237 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2238 }
2239
2240 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2241 size_t alignment_hint, bool exec,
2242 const char* mesg) {
2243 assert(mesg != NULL, "mesg must be specified");
2244 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2245 if (err != 0) {
2246 // the caller wants all commit errors to exit with the specified mesg:
2247 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2248 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2249 }
2250 }
2251
2252 // Uncommit the pages in a specified region.
2253 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2254 if (madvise(addr, bytes, MADV_FREE) < 0) {
2255 debug_only(warning("MADV_FREE failed."));
2256 return;
2257 }
2258 }
2259
2260 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2261 return os::commit_memory(addr, size, !ExecMem);
2262 }
2263
2264 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2265 return os::uncommit_memory(addr, size);
2266 }
2267
2268 // Change the page size in a given range.
2269 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2270 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2271 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2272 if (UseLargePages) {
2273 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2274 if (page_size > (size_t) vm_page_size()) {
2275 Solaris::setup_large_pages(addr, bytes, page_size);
2276 }
2277 }
2278 }
2279
2280 // Tell the OS to make the range local to the first-touching LWP
2281 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2282 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2283 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2284 debug_only(warning("MADV_ACCESS_LWP failed."));
2285 }
2286 }
2287
2288 // Tell the OS that this range would be accessed from different LWPs.
2289 void os::numa_make_global(char *addr, size_t bytes) {
2290 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2291 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2292 debug_only(warning("MADV_ACCESS_MANY failed."));
2293 }
2294 }
2295
2296 // Get the number of the locality groups.
2297 size_t os::numa_get_groups_num() {
2298 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2299 return n != -1 ? n : 1;
2300 }
2301
2302 // Get a list of leaf locality groups. A leaf lgroup is group that
2303 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2304 // board. An LWP is assigned to one of these groups upon creation.
2305 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2306 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2307 ids[0] = 0;
2308 return 1;
2309 }
2310 int result_size = 0, top = 1, bottom = 0, cur = 0;
2311 for (int k = 0; k < size; k++) {
2312 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2313 (Solaris::lgrp_id_t*)&ids[top], size - top);
2314 if (r == -1) {
2315 ids[0] = 0;
2316 return 1;
2317 }
2318 if (!r) {
2319 // That's a leaf node.
2320 assert(bottom <= cur, "Sanity check");
2321 // Check if the node has memory
2322 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2323 NULL, 0, LGRP_RSRC_MEM) > 0) {
2324 ids[bottom++] = ids[cur];
2325 }
2326 }
2327 top += r;
2328 cur++;
2329 }
2330 if (bottom == 0) {
2331 // Handle a situation, when the OS reports no memory available.
2332 // Assume UMA architecture.
2333 ids[0] = 0;
2334 return 1;
2335 }
2336 return bottom;
2337 }
2338
2339 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2340 bool os::numa_topology_changed() {
2341 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2342 if (is_stale != -1 && is_stale) {
2343 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2344 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2345 assert(c != 0, "Failure to initialize LGRP API");
2346 Solaris::set_lgrp_cookie(c);
2347 return true;
2348 }
2349 return false;
2350 }
2351
2352 // Get the group id of the current LWP.
2353 int os::numa_get_group_id() {
2354 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2355 if (lgrp_id == -1) {
2356 return 0;
2357 }
2358 const int size = os::numa_get_groups_num();
2359 int *ids = (int*)alloca(size * sizeof(int));
2360
2361 // Get the ids of all lgroups with memory; r is the count.
2362 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2363 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2364 if (r <= 0) {
2365 return 0;
2366 }
2367 return ids[os::random() % r];
2368 }
2369
2370 // Request information about the page.
2371 bool os::get_page_info(char *start, page_info* info) {
2372 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2373 uint64_t addr = (uintptr_t)start;
2374 uint64_t outdata[2];
2375 uint_t validity = 0;
2376
2377 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2378 return false;
2379 }
2380
2381 info->size = 0;
2382 info->lgrp_id = -1;
2383
2384 if ((validity & 1) != 0) {
2385 if ((validity & 2) != 0) {
2386 info->lgrp_id = outdata[0];
2387 }
2388 if ((validity & 4) != 0) {
2389 info->size = outdata[1];
2390 }
2391 return true;
2392 }
2393 return false;
2394 }
2395
2396 // Scan the pages from start to end until a page different than
2397 // the one described in the info parameter is encountered.
2398 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2399 page_info* page_found) {
2400 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2401 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2402 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2403 uint_t validity[MAX_MEMINFO_CNT];
2404
2405 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2406 uint64_t p = (uint64_t)start;
2407 while (p < (uint64_t)end) {
2408 addrs[0] = p;
2409 size_t addrs_count = 1;
2410 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2411 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2412 addrs_count++;
2413 }
2414
2415 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2416 return NULL;
2417 }
2418
2419 size_t i = 0;
2420 for (; i < addrs_count; i++) {
2421 if ((validity[i] & 1) != 0) {
2422 if ((validity[i] & 4) != 0) {
2423 if (outdata[types * i + 1] != page_expected->size) {
2424 break;
2425 }
2426 } else if (page_expected->size != 0) {
2427 break;
2428 }
2429
2430 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2431 if (outdata[types * i] != page_expected->lgrp_id) {
2432 break;
2433 }
2434 }
2435 } else {
2436 return NULL;
2437 }
2438 }
2439
2440 if (i < addrs_count) {
2441 if ((validity[i] & 2) != 0) {
2442 page_found->lgrp_id = outdata[types * i];
2443 } else {
2444 page_found->lgrp_id = -1;
2445 }
2446 if ((validity[i] & 4) != 0) {
2447 page_found->size = outdata[types * i + 1];
2448 } else {
2449 page_found->size = 0;
2450 }
2451 return (char*)addrs[i];
2452 }
2453
2454 p = addrs[addrs_count - 1] + page_size;
2455 }
2456 return end;
2457 }
2458
2459 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2460 size_t size = bytes;
2461 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2462 // uncommitted page. Otherwise, the read/write might succeed if we
2463 // have enough swap space to back the physical page.
2464 return
2465 NULL != Solaris::mmap_chunk(addr, size,
2466 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2467 PROT_NONE);
2468 }
2469
2470 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2471 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2472
2473 if (b == MAP_FAILED) {
2474 return NULL;
2475 }
2476 return b;
2477 }
2478
2479 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2480 size_t alignment_hint, bool fixed) {
2481 char* addr = requested_addr;
2482 int flags = MAP_PRIVATE | MAP_NORESERVE;
2483
2484 assert(!(fixed && (alignment_hint > 0)),
2485 "alignment hint meaningless with fixed mmap");
2486
2487 if (fixed) {
2488 flags |= MAP_FIXED;
2489 } else if (alignment_hint > (size_t) vm_page_size()) {
2490 flags |= MAP_ALIGN;
2491 addr = (char*) alignment_hint;
2492 }
2493
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 mmap_chunk(addr, bytes, flags, PROT_NONE);
2498 }
2499
2500 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2501 size_t alignment_hint) {
2502 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2503 (requested_addr != NULL));
2504
2505 guarantee(requested_addr == NULL || requested_addr == addr,
2506 "OS failed to return requested mmap address.");
2507 return addr;
2508 }
2509
2510 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2511 assert(file_desc >= 0, "file_desc is not valid");
2512 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2513 if (result != NULL) {
2514 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2515 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2516 }
2517 }
2518 return result;
2519 }
2520
2521 // Reserve memory at an arbitrary address, only if that area is
2522 // available (and not reserved for something else).
2523
2524 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2525 const int max_tries = 10;
2526 char* base[max_tries];
2527 size_t size[max_tries];
2528
2529 // Solaris adds a gap between mmap'ed regions. The size of the gap
2530 // is dependent on the requested size and the MMU. Our initial gap
2531 // value here is just a guess and will be corrected later.
2532 bool had_top_overlap = false;
2533 bool have_adjusted_gap = false;
2534 size_t gap = 0x400000;
2535
2536 // Assert only that the size is a multiple of the page size, since
2537 // that's all that mmap requires, and since that's all we really know
2538 // about at this low abstraction level. If we need higher alignment,
2539 // we can either pass an alignment to this method or verify alignment
2540 // in one of the methods further up the call chain. See bug 5044738.
2541 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2542
2543 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2544 // Give it a try, if the kernel honors the hint we can return immediately.
2545 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2546
2547 volatile int err = errno;
2548 if (addr == requested_addr) {
2549 return addr;
2550 } else if (addr != NULL) {
2551 pd_unmap_memory(addr, bytes);
2552 }
2553
2554 if (log_is_enabled(Warning, os)) {
2555 char buf[256];
2556 buf[0] = '\0';
2557 if (addr == NULL) {
2558 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2559 }
2560 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2561 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2562 "%s", bytes, requested_addr, addr, buf);
2563 }
2564
2565 // Address hint method didn't work. Fall back to the old method.
2566 // In theory, once SNV becomes our oldest supported platform, this
2567 // code will no longer be needed.
2568 //
2569 // Repeatedly allocate blocks until the block is allocated at the
2570 // right spot. Give up after max_tries.
2571 int i;
2572 for (i = 0; i < max_tries; ++i) {
2573 base[i] = reserve_memory(bytes);
2574
2575 if (base[i] != NULL) {
2576 // Is this the block we wanted?
2577 if (base[i] == requested_addr) {
2578 size[i] = bytes;
2579 break;
2580 }
2581
2582 // check that the gap value is right
2583 if (had_top_overlap && !have_adjusted_gap) {
2584 size_t actual_gap = base[i-1] - base[i] - bytes;
2585 if (gap != actual_gap) {
2586 // adjust the gap value and retry the last 2 allocations
2587 assert(i > 0, "gap adjustment code problem");
2588 have_adjusted_gap = true; // adjust the gap only once, just in case
2589 gap = actual_gap;
2590 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2591 unmap_memory(base[i], bytes);
2592 unmap_memory(base[i-1], size[i-1]);
2593 i-=2;
2594 continue;
2595 }
2596 }
2597
2598 // Does this overlap the block we wanted? Give back the overlapped
2599 // parts and try again.
2600 //
2601 // There is still a bug in this code: if top_overlap == bytes,
2602 // the overlap is offset from requested region by the value of gap.
2603 // In this case giving back the overlapped part will not work,
2604 // because we'll give back the entire block at base[i] and
2605 // therefore the subsequent allocation will not generate a new gap.
2606 // This could be fixed with a new algorithm that used larger
2607 // or variable size chunks to find the requested region -
2608 // but such a change would introduce additional complications.
2609 // It's rare enough that the planets align for this bug,
2610 // so we'll just wait for a fix for 6204603/5003415 which
2611 // will provide a mmap flag to allow us to avoid this business.
2612
2613 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2614 if (top_overlap >= 0 && top_overlap < bytes) {
2615 had_top_overlap = true;
2616 unmap_memory(base[i], top_overlap);
2617 base[i] += top_overlap;
2618 size[i] = bytes - top_overlap;
2619 } else {
2620 size_t bottom_overlap = base[i] + bytes - requested_addr;
2621 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2622 if (bottom_overlap == 0) {
2623 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2624 }
2625 unmap_memory(requested_addr, bottom_overlap);
2626 size[i] = bytes - bottom_overlap;
2627 } else {
2628 size[i] = bytes;
2629 }
2630 }
2631 }
2632 }
2633
2634 // Give back the unused reserved pieces.
2635
2636 for (int j = 0; j < i; ++j) {
2637 if (base[j] != NULL) {
2638 unmap_memory(base[j], size[j]);
2639 }
2640 }
2641
2642 return (i < max_tries) ? requested_addr : NULL;
2643 }
2644
2645 bool os::pd_release_memory(char* addr, size_t bytes) {
2646 size_t size = bytes;
2647 return munmap(addr, size) == 0;
2648 }
2649
2650 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2651 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2652 "addr must be page aligned");
2653 int retVal = mprotect(addr, bytes, prot);
2654 return retVal == 0;
2655 }
2656
2657 // Protect memory (Used to pass readonly pages through
2658 // JNI GetArray<type>Elements with empty arrays.)
2659 // Also, used for serialization page and for compressed oops null pointer
2660 // checking.
2661 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2662 bool is_committed) {
2663 unsigned int p = 0;
2664 switch (prot) {
2665 case MEM_PROT_NONE: p = PROT_NONE; break;
2666 case MEM_PROT_READ: p = PROT_READ; break;
2667 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2668 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2669 default:
2670 ShouldNotReachHere();
2671 }
2672 // is_committed is unused.
2673 return solaris_mprotect(addr, bytes, p);
2674 }
2675
2676 // guard_memory and unguard_memory only happens within stack guard pages.
2677 // Since ISM pertains only to the heap, guard and unguard memory should not
2678 /// happen with an ISM region.
2679 bool os::guard_memory(char* addr, size_t bytes) {
2680 return solaris_mprotect(addr, bytes, PROT_NONE);
2681 }
2682
2683 bool os::unguard_memory(char* addr, size_t bytes) {
2684 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2685 }
2686
2687 // Large page support
2688 static size_t _large_page_size = 0;
2689
2690 // Insertion sort for small arrays (descending order).
2691 static void insertion_sort_descending(size_t* array, int len) {
2692 for (int i = 0; i < len; i++) {
2693 size_t val = array[i];
2694 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2695 size_t tmp = array[key];
2696 array[key] = array[key - 1];
2697 array[key - 1] = tmp;
2698 }
2699 }
2700 }
2701
2702 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2703 const unsigned int usable_count = VM_Version::page_size_count();
2704 if (usable_count == 1) {
2705 return false;
2706 }
2707
2708 // Find the right getpagesizes interface. When solaris 11 is the minimum
2709 // build platform, getpagesizes() (without the '2') can be called directly.
2710 typedef int (*gps_t)(size_t[], int);
2711 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2712 if (gps_func == NULL) {
2713 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2714 if (gps_func == NULL) {
2715 if (warn) {
2716 warning("MPSS is not supported by the operating system.");
2717 }
2718 return false;
2719 }
2720 }
2721
2722 // Fill the array of page sizes.
2723 int n = (*gps_func)(_page_sizes, page_sizes_max);
2724 assert(n > 0, "Solaris bug?");
2725
2726 if (n == page_sizes_max) {
2727 // Add a sentinel value (necessary only if the array was completely filled
2728 // since it is static (zeroed at initialization)).
2729 _page_sizes[--n] = 0;
2730 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2731 }
2732 assert(_page_sizes[n] == 0, "missing sentinel");
2733 trace_page_sizes("available page sizes", _page_sizes, n);
2734
2735 if (n == 1) return false; // Only one page size available.
2736
2737 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2738 // select up to usable_count elements. First sort the array, find the first
2739 // acceptable value, then copy the usable sizes to the top of the array and
2740 // trim the rest. Make sure to include the default page size :-).
2741 //
2742 // A better policy could get rid of the 4M limit by taking the sizes of the
2743 // important VM memory regions (java heap and possibly the code cache) into
2744 // account.
2745 insertion_sort_descending(_page_sizes, n);
2746 const size_t size_limit =
2747 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2748 int beg;
2749 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2750 const int end = MIN2((int)usable_count, n) - 1;
2751 for (int cur = 0; cur < end; ++cur, ++beg) {
2752 _page_sizes[cur] = _page_sizes[beg];
2753 }
2754 _page_sizes[end] = vm_page_size();
2755 _page_sizes[end + 1] = 0;
2756
2757 if (_page_sizes[end] > _page_sizes[end - 1]) {
2758 // Default page size is not the smallest; sort again.
2759 insertion_sort_descending(_page_sizes, end + 1);
2760 }
2761 *page_size = _page_sizes[0];
2762
2763 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2764 return true;
2765 }
2766
2767 void os::large_page_init() {
2768 if (UseLargePages) {
2769 // print a warning if any large page related flag is specified on command line
2770 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2771 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2772
2773 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2774 }
2775 }
2776
2777 bool os::Solaris::is_valid_page_size(size_t bytes) {
2778 for (int i = 0; _page_sizes[i] != 0; i++) {
2779 if (_page_sizes[i] == bytes) {
2780 return true;
2781 }
2782 }
2783 return false;
2784 }
2785
2786 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2787 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2788 assert(is_aligned((void*) start, align),
2789 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2790 assert(is_aligned(bytes, align),
2791 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2792
2793 // Signal to OS that we want large pages for addresses
2794 // from addr, addr + bytes
2795 struct memcntl_mha mpss_struct;
2796 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2797 mpss_struct.mha_pagesize = align;
2798 mpss_struct.mha_flags = 0;
2799 // Upon successful completion, memcntl() returns 0
2800 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2801 debug_only(warning("Attempt to use MPSS failed."));
2802 return false;
2803 }
2804 return true;
2805 }
2806
2807 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2808 fatal("os::reserve_memory_special should not be called on Solaris.");
2809 return NULL;
2810 }
2811
2812 bool os::release_memory_special(char* base, size_t bytes) {
2813 fatal("os::release_memory_special should not be called on Solaris.");
2814 return false;
2815 }
2816
2817 size_t os::large_page_size() {
2818 return _large_page_size;
2819 }
2820
2821 // MPSS allows application to commit large page memory on demand; with ISM
2822 // the entire memory region must be allocated as shared memory.
2823 bool os::can_commit_large_page_memory() {
2824 return true;
2825 }
2826
2827 bool os::can_execute_large_page_memory() {
2828 return true;
2829 }
2830
2831 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2832 void os::infinite_sleep() {
2833 while (true) { // sleep forever ...
2834 ::sleep(100); // ... 100 seconds at a time
2835 }
2836 }
2837
2838 // Used to convert frequent JVM_Yield() to nops
2839 bool os::dont_yield() {
2840 if (DontYieldALot) {
2841 static hrtime_t last_time = 0;
2842 hrtime_t diff = getTimeNanos() - last_time;
2843
2844 if (diff < DontYieldALotInterval * 1000000) {
2845 return true;
2846 }
2847
2848 last_time += diff;
2849
2850 return false;
2851 } else {
2852 return false;
2853 }
2854 }
2855
2856 // Note that yield semantics are defined by the scheduling class to which
2857 // the thread currently belongs. Typically, yield will _not yield to
2858 // other equal or higher priority threads that reside on the dispatch queues
2859 // of other CPUs.
2860
2861 void os::naked_yield() {
2862 thr_yield();
2863 }
2864
2865 // Interface for setting lwp priorities. We are using T2 libthread,
2866 // which forces the use of bound threads, so all of our threads will
2867 // be assigned to real lwp's. Using the thr_setprio function is
2868 // meaningless in this mode so we must adjust the real lwp's priority.
2869 // The routines below implement the getting and setting of lwp priorities.
2870 //
2871 // Note: There are three priority scales used on Solaris. Java priotities
2872 // which range from 1 to 10, libthread "thr_setprio" scale which range
2873 // from 0 to 127, and the current scheduling class of the process we
2874 // are running in. This is typically from -60 to +60.
2875 // The setting of the lwp priorities in done after a call to thr_setprio
2876 // so Java priorities are mapped to libthread priorities and we map from
2877 // the latter to lwp priorities. We don't keep priorities stored in
2878 // Java priorities since some of our worker threads want to set priorities
2879 // higher than all Java threads.
2880 //
2881 // For related information:
2882 // (1) man -s 2 priocntl
2883 // (2) man -s 4 priocntl
2884 // (3) man dispadmin
2885 // = librt.so
2886 // = libthread/common/rtsched.c - thrp_setlwpprio().
2887 // = ps -cL <pid> ... to validate priority.
2888 // = sched_get_priority_min and _max
2889 // pthread_create
2890 // sched_setparam
2891 // pthread_setschedparam
2892 //
2893 // Assumptions:
2894 // + We assume that all threads in the process belong to the same
2895 // scheduling class. IE. an homogenous process.
2896 // + Must be root or in IA group to change change "interactive" attribute.
2897 // Priocntl() will fail silently. The only indication of failure is when
2898 // we read-back the value and notice that it hasn't changed.
2899 // + Interactive threads enter the runq at the head, non-interactive at the tail.
2900 // + For RT, change timeslice as well. Invariant:
2901 // constant "priority integral"
2902 // Konst == TimeSlice * (60-Priority)
2903 // Given a priority, compute appropriate timeslice.
2904 // + Higher numerical values have higher priority.
2905
2906 // sched class attributes
2907 typedef struct {
2908 int schedPolicy; // classID
2909 int maxPrio;
2910 int minPrio;
2911 } SchedInfo;
2912
2913
2914 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
2915
2916 #ifdef ASSERT
2917 static int ReadBackValidate = 1;
2918 #endif
2919 static int myClass = 0;
2920 static int myMin = 0;
2921 static int myMax = 0;
2922 static int myCur = 0;
2923 static bool priocntl_enable = false;
2924
2925 static const int criticalPrio = FXCriticalPriority;
2926 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
2927
2928
2929 // lwp_priocntl_init
2930 //
2931 // Try to determine the priority scale for our process.
2932 //
2933 // Return errno or 0 if OK.
2934 //
2935 static int lwp_priocntl_init() {
2936 int rslt;
2937 pcinfo_t ClassInfo;
2938 pcparms_t ParmInfo;
2939 int i;
2940
2941 if (!UseThreadPriorities) return 0;
2942
2943 // If ThreadPriorityPolicy is 1, switch tables
2944 if (ThreadPriorityPolicy == 1) {
2945 for (i = 0; i < CriticalPriority+1; i++)
2946 os::java_to_os_priority[i] = prio_policy1[i];
2947 }
2948 if (UseCriticalJavaThreadPriority) {
2949 // MaxPriority always maps to the FX scheduling class and criticalPrio.
2950 // See set_native_priority() and set_lwp_class_and_priority().
2951 // Save original MaxPriority mapping in case attempt to
2952 // use critical priority fails.
2953 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
2954 // Set negative to distinguish from other priorities
2955 os::java_to_os_priority[MaxPriority] = -criticalPrio;
2956 }
2957
2958 // Get IDs for a set of well-known scheduling classes.
2959 // TODO-FIXME: GETCLINFO returns the current # of classes in the
2960 // the system. We should have a loop that iterates over the
2961 // classID values, which are known to be "small" integers.
2962
2963 strcpy(ClassInfo.pc_clname, "TS");
2964 ClassInfo.pc_cid = -1;
2965 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2966 if (rslt < 0) return errno;
2967 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
2968 tsLimits.schedPolicy = ClassInfo.pc_cid;
2969 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
2970 tsLimits.minPrio = -tsLimits.maxPrio;
2971
2972 strcpy(ClassInfo.pc_clname, "IA");
2973 ClassInfo.pc_cid = -1;
2974 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2975 if (rslt < 0) return errno;
2976 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
2977 iaLimits.schedPolicy = ClassInfo.pc_cid;
2978 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
2979 iaLimits.minPrio = -iaLimits.maxPrio;
2980
2981 strcpy(ClassInfo.pc_clname, "RT");
2982 ClassInfo.pc_cid = -1;
2983 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2984 if (rslt < 0) return errno;
2985 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
2986 rtLimits.schedPolicy = ClassInfo.pc_cid;
2987 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
2988 rtLimits.minPrio = 0;
2989
2990 strcpy(ClassInfo.pc_clname, "FX");
2991 ClassInfo.pc_cid = -1;
2992 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2993 if (rslt < 0) return errno;
2994 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
2995 fxLimits.schedPolicy = ClassInfo.pc_cid;
2996 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
2997 fxLimits.minPrio = 0;
2998
2999 // Query our "current" scheduling class.
3000 // This will normally be IA, TS or, rarely, FX or RT.
3001 memset(&ParmInfo, 0, sizeof(ParmInfo));
3002 ParmInfo.pc_cid = PC_CLNULL;
3003 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3004 if (rslt < 0) return errno;
3005 myClass = ParmInfo.pc_cid;
3006
3007 // We now know our scheduling classId, get specific information
3008 // about the class.
3009 ClassInfo.pc_cid = myClass;
3010 ClassInfo.pc_clname[0] = 0;
3011 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3012 if (rslt < 0) return errno;
3013
3014 if (ThreadPriorityVerbose) {
3015 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3016 }
3017
3018 memset(&ParmInfo, 0, sizeof(pcparms_t));
3019 ParmInfo.pc_cid = PC_CLNULL;
3020 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3021 if (rslt < 0) return errno;
3022
3023 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3024 myMin = rtLimits.minPrio;
3025 myMax = rtLimits.maxPrio;
3026 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3027 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3028 myMin = iaLimits.minPrio;
3029 myMax = iaLimits.maxPrio;
3030 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3031 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3032 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3033 myMin = tsLimits.minPrio;
3034 myMax = tsLimits.maxPrio;
3035 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3036 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3037 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3038 myMin = fxLimits.minPrio;
3039 myMax = fxLimits.maxPrio;
3040 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3041 } else {
3042 // No clue - punt
3043 if (ThreadPriorityVerbose) {
3044 tty->print_cr("Unknown scheduling class: %s ... \n",
3045 ClassInfo.pc_clname);
3046 }
3047 return EINVAL; // no clue, punt
3048 }
3049
3050 if (ThreadPriorityVerbose) {
3051 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3052 }
3053
3054 priocntl_enable = true; // Enable changing priorities
3055 return 0;
3056 }
3057
3058 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3059 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3060 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3061 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3062
3063
3064 // scale_to_lwp_priority
3065 //
3066 // Convert from the libthread "thr_setprio" scale to our current
3067 // lwp scheduling class scale.
3068 //
3069 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3070 int v;
3071
3072 if (x == 127) return rMax; // avoid round-down
3073 v = (((x*(rMax-rMin)))/128)+rMin;
3074 return v;
3075 }
3076
3077
3078 // set_lwp_class_and_priority
3079 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3080 int newPrio, int new_class, bool scale) {
3081 int rslt;
3082 int Actual, Expected, prv;
3083 pcparms_t ParmInfo; // for GET-SET
3084 #ifdef ASSERT
3085 pcparms_t ReadBack; // for readback
3086 #endif
3087
3088 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3089 // Query current values.
3090 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3091 // Cache "pcparms_t" in global ParmCache.
3092 // TODO: elide set-to-same-value
3093
3094 // If something went wrong on init, don't change priorities.
3095 if (!priocntl_enable) {
3096 if (ThreadPriorityVerbose) {
3097 tty->print_cr("Trying to set priority but init failed, ignoring");
3098 }
3099 return EINVAL;
3100 }
3101
3102 // If lwp hasn't started yet, just return
3103 // the _start routine will call us again.
3104 if (lwpid <= 0) {
3105 if (ThreadPriorityVerbose) {
3106 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3107 INTPTR_FORMAT " to %d, lwpid not set",
3108 ThreadID, newPrio);
3109 }
3110 return 0;
3111 }
3112
3113 if (ThreadPriorityVerbose) {
3114 tty->print_cr ("set_lwp_class_and_priority("
3115 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3116 ThreadID, lwpid, newPrio);
3117 }
3118
3119 memset(&ParmInfo, 0, sizeof(pcparms_t));
3120 ParmInfo.pc_cid = PC_CLNULL;
3121 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3122 if (rslt < 0) return errno;
3123
3124 int cur_class = ParmInfo.pc_cid;
3125 ParmInfo.pc_cid = (id_t)new_class;
3126
3127 if (new_class == rtLimits.schedPolicy) {
3128 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3129 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3130 rtLimits.maxPrio, newPrio)
3131 : newPrio;
3132 rtInfo->rt_tqsecs = RT_NOCHANGE;
3133 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3134 if (ThreadPriorityVerbose) {
3135 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3136 }
3137 } else if (new_class == iaLimits.schedPolicy) {
3138 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3139 int maxClamped = MIN2(iaLimits.maxPrio,
3140 cur_class == new_class
3141 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3142 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3143 maxClamped, newPrio)
3144 : newPrio;
3145 iaInfo->ia_uprilim = cur_class == new_class
3146 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3147 iaInfo->ia_mode = IA_NOCHANGE;
3148 if (ThreadPriorityVerbose) {
3149 tty->print_cr("IA: [%d...%d] %d->%d\n",
3150 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3151 }
3152 } else if (new_class == tsLimits.schedPolicy) {
3153 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3154 int maxClamped = MIN2(tsLimits.maxPrio,
3155 cur_class == new_class
3156 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3157 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3158 maxClamped, newPrio)
3159 : newPrio;
3160 tsInfo->ts_uprilim = cur_class == new_class
3161 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3162 if (ThreadPriorityVerbose) {
3163 tty->print_cr("TS: [%d...%d] %d->%d\n",
3164 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3165 }
3166 } else if (new_class == fxLimits.schedPolicy) {
3167 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3168 int maxClamped = MIN2(fxLimits.maxPrio,
3169 cur_class == new_class
3170 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3171 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3172 maxClamped, newPrio)
3173 : newPrio;
3174 fxInfo->fx_uprilim = cur_class == new_class
3175 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3176 fxInfo->fx_tqsecs = FX_NOCHANGE;
3177 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3178 if (ThreadPriorityVerbose) {
3179 tty->print_cr("FX: [%d...%d] %d->%d\n",
3180 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3181 }
3182 } else {
3183 if (ThreadPriorityVerbose) {
3184 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3185 }
3186 return EINVAL; // no clue, punt
3187 }
3188
3189 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3190 if (ThreadPriorityVerbose && rslt) {
3191 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3192 }
3193 if (rslt < 0) return errno;
3194
3195 #ifdef ASSERT
3196 // Sanity check: read back what we just attempted to set.
3197 // In theory it could have changed in the interim ...
3198 //
3199 // The priocntl system call is tricky.
3200 // Sometimes it'll validate the priority value argument and
3201 // return EINVAL if unhappy. At other times it fails silently.
3202 // Readbacks are prudent.
3203
3204 if (!ReadBackValidate) return 0;
3205
3206 memset(&ReadBack, 0, sizeof(pcparms_t));
3207 ReadBack.pc_cid = PC_CLNULL;
3208 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3209 assert(rslt >= 0, "priocntl failed");
3210 Actual = Expected = 0xBAD;
3211 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3212 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3213 Actual = RTPRI(ReadBack)->rt_pri;
3214 Expected = RTPRI(ParmInfo)->rt_pri;
3215 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3216 Actual = IAPRI(ReadBack)->ia_upri;
3217 Expected = IAPRI(ParmInfo)->ia_upri;
3218 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3219 Actual = TSPRI(ReadBack)->ts_upri;
3220 Expected = TSPRI(ParmInfo)->ts_upri;
3221 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3222 Actual = FXPRI(ReadBack)->fx_upri;
3223 Expected = FXPRI(ParmInfo)->fx_upri;
3224 } else {
3225 if (ThreadPriorityVerbose) {
3226 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3227 ParmInfo.pc_cid);
3228 }
3229 }
3230
3231 if (Actual != Expected) {
3232 if (ThreadPriorityVerbose) {
3233 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3234 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3235 }
3236 }
3237 #endif
3238
3239 return 0;
3240 }
3241
3242 // Solaris only gives access to 128 real priorities at a time,
3243 // so we expand Java's ten to fill this range. This would be better
3244 // if we dynamically adjusted relative priorities.
3245 //
3246 // The ThreadPriorityPolicy option allows us to select 2 different
3247 // priority scales.
3248 //
3249 // ThreadPriorityPolicy=0
3250 // Since the Solaris' default priority is MaximumPriority, we do not
3251 // set a priority lower than Max unless a priority lower than
3252 // NormPriority is requested.
3253 //
3254 // ThreadPriorityPolicy=1
3255 // This mode causes the priority table to get filled with
3256 // linear values. NormPriority get's mapped to 50% of the
3257 // Maximum priority an so on. This will cause VM threads
3258 // to get unfair treatment against other Solaris processes
3259 // which do not explicitly alter their thread priorities.
3260
3261 int os::java_to_os_priority[CriticalPriority + 1] = {
3262 -99999, // 0 Entry should never be used
3263
3264 0, // 1 MinPriority
3265 32, // 2
3266 64, // 3
3267
3268 96, // 4
3269 127, // 5 NormPriority
3270 127, // 6
3271
3272 127, // 7
3273 127, // 8
3274 127, // 9 NearMaxPriority
3275
3276 127, // 10 MaxPriority
3277
3278 -criticalPrio // 11 CriticalPriority
3279 };
3280
3281 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3282 OSThread* osthread = thread->osthread();
3283
3284 // Save requested priority in case the thread hasn't been started
3285 osthread->set_native_priority(newpri);
3286
3287 // Check for critical priority request
3288 bool fxcritical = false;
3289 if (newpri == -criticalPrio) {
3290 fxcritical = true;
3291 newpri = criticalPrio;
3292 }
3293
3294 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3295 if (!UseThreadPriorities) return OS_OK;
3296
3297 int status = 0;
3298
3299 if (!fxcritical) {
3300 // Use thr_setprio only if we have a priority that thr_setprio understands
3301 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3302 }
3303
3304 int lwp_status =
3305 set_lwp_class_and_priority(osthread->thread_id(),
3306 osthread->lwp_id(),
3307 newpri,
3308 fxcritical ? fxLimits.schedPolicy : myClass,
3309 !fxcritical);
3310 if (lwp_status != 0 && fxcritical) {
3311 // Try again, this time without changing the scheduling class
3312 newpri = java_MaxPriority_to_os_priority;
3313 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3314 osthread->lwp_id(),
3315 newpri, myClass, false);
3316 }
3317 status |= lwp_status;
3318 return (status == 0) ? OS_OK : OS_ERR;
3319 }
3320
3321
3322 OSReturn os::get_native_priority(const Thread* const thread,
3323 int *priority_ptr) {
3324 int p;
3325 if (!UseThreadPriorities) {
3326 *priority_ptr = NormalPriority;
3327 return OS_OK;
3328 }
3329 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3330 if (status != 0) {
3331 return OS_ERR;
3332 }
3333 *priority_ptr = p;
3334 return OS_OK;
3335 }
3336
3337 ////////////////////////////////////////////////////////////////////////////////
3338 // suspend/resume support
3339
3340 // The low-level signal-based suspend/resume support is a remnant from the
3341 // old VM-suspension that used to be for java-suspension, safepoints etc,
3342 // within hotspot. Currently used by JFR's OSThreadSampler
3343 //
3344 // The remaining code is greatly simplified from the more general suspension
3345 // code that used to be used.
3346 //
3347 // The protocol is quite simple:
3348 // - suspend:
3349 // - sends a signal to the target thread
3350 // - polls the suspend state of the osthread using a yield loop
3351 // - target thread signal handler (SR_handler) sets suspend state
3352 // and blocks in sigsuspend until continued
3353 // - resume:
3354 // - sets target osthread state to continue
3355 // - sends signal to end the sigsuspend loop in the SR_handler
3356 //
3357 // Note that the SR_lock plays no role in this suspend/resume protocol,
3358 // but is checked for NULL in SR_handler as a thread termination indicator.
3359 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3360 //
3361 // Note that resume_clear_context() and suspend_save_context() are needed
3362 // by SR_handler(), so that fetch_frame_from_ucontext() works,
3363 // which in part is used by:
3364 // - Forte Analyzer: AsyncGetCallTrace()
3365 // - StackBanging: get_frame_at_stack_banging_point()
3366 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3367
3368 static void resume_clear_context(OSThread *osthread) {
3369 osthread->set_ucontext(NULL);
3370 }
3371
3372 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3373 osthread->set_ucontext(context);
3374 }
3375
3376 static PosixSemaphore sr_semaphore;
3377
3378 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3379 // Save and restore errno to avoid confusing native code with EINTR
3380 // after sigsuspend.
3381 int old_errno = errno;
3382
3383 OSThread* osthread = thread->osthread();
3384 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3385
3386 os::SuspendResume::State current = osthread->sr.state();
3387 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3388 suspend_save_context(osthread, context);
3389
3390 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3391 os::SuspendResume::State state = osthread->sr.suspended();
3392 if (state == os::SuspendResume::SR_SUSPENDED) {
3393 sigset_t suspend_set; // signals for sigsuspend()
3394
3395 // get current set of blocked signals and unblock resume signal
3396 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3397 sigdelset(&suspend_set, ASYNC_SIGNAL);
3398
3399 sr_semaphore.signal();
3400 // wait here until we are resumed
3401 while (1) {
3402 sigsuspend(&suspend_set);
3403
3404 os::SuspendResume::State result = osthread->sr.running();
3405 if (result == os::SuspendResume::SR_RUNNING) {
3406 sr_semaphore.signal();
3407 break;
3408 }
3409 }
3410
3411 } else if (state == os::SuspendResume::SR_RUNNING) {
3412 // request was cancelled, continue
3413 } else {
3414 ShouldNotReachHere();
3415 }
3416
3417 resume_clear_context(osthread);
3418 } else if (current == os::SuspendResume::SR_RUNNING) {
3419 // request was cancelled, continue
3420 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3421 // ignore
3422 } else {
3423 // ignore
3424 }
3425
3426 errno = old_errno;
3427 }
3428
3429 void os::print_statistics() {
3430 }
3431
3432 bool os::message_box(const char* title, const char* message) {
3433 int i;
3434 fdStream err(defaultStream::error_fd());
3435 for (i = 0; i < 78; i++) err.print_raw("=");
3436 err.cr();
3437 err.print_raw_cr(title);
3438 for (i = 0; i < 78; i++) err.print_raw("-");
3439 err.cr();
3440 err.print_raw_cr(message);
3441 for (i = 0; i < 78; i++) err.print_raw("=");
3442 err.cr();
3443
3444 char buf[16];
3445 // Prevent process from exiting upon "read error" without consuming all CPU
3446 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3447
3448 return buf[0] == 'y' || buf[0] == 'Y';
3449 }
3450
3451 static int sr_notify(OSThread* osthread) {
3452 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3453 assert_status(status == 0, status, "thr_kill");
3454 return status;
3455 }
3456
3457 // "Randomly" selected value for how long we want to spin
3458 // before bailing out on suspending a thread, also how often
3459 // we send a signal to a thread we want to resume
3460 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3461 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3462
3463 static bool do_suspend(OSThread* osthread) {
3464 assert(osthread->sr.is_running(), "thread should be running");
3465 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3466
3467 // mark as suspended and send signal
3468 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3469 // failed to switch, state wasn't running?
3470 ShouldNotReachHere();
3471 return false;
3472 }
3473
3474 if (sr_notify(osthread) != 0) {
3475 ShouldNotReachHere();
3476 }
3477
3478 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3479 while (true) {
3480 if (sr_semaphore.timedwait(2000)) {
3481 break;
3482 } else {
3483 // timeout
3484 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3485 if (cancelled == os::SuspendResume::SR_RUNNING) {
3486 return false;
3487 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3488 // make sure that we consume the signal on the semaphore as well
3489 sr_semaphore.wait();
3490 break;
3491 } else {
3492 ShouldNotReachHere();
3493 return false;
3494 }
3495 }
3496 }
3497
3498 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3499 return true;
3500 }
3501
3502 static void do_resume(OSThread* osthread) {
3503 assert(osthread->sr.is_suspended(), "thread should be suspended");
3504 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3505
3506 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3507 // failed to switch to WAKEUP_REQUEST
3508 ShouldNotReachHere();
3509 return;
3510 }
3511
3512 while (true) {
3513 if (sr_notify(osthread) == 0) {
3514 if (sr_semaphore.timedwait(2)) {
3515 if (osthread->sr.is_running()) {
3516 return;
3517 }
3518 }
3519 } else {
3520 ShouldNotReachHere();
3521 }
3522 }
3523
3524 guarantee(osthread->sr.is_running(), "Must be running!");
3525 }
3526
3527 void os::SuspendedThreadTask::internal_do_task() {
3528 if (do_suspend(_thread->osthread())) {
3529 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3530 do_task(context);
3531 do_resume(_thread->osthread());
3532 }
3533 }
3534
3535 // This does not do anything on Solaris. This is basically a hook for being
3536 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3537 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3538 const methodHandle& method, JavaCallArguments* args,
3539 Thread* thread) {
3540 f(value, method, args, thread);
3541 }
3542
3543 // This routine may be used by user applications as a "hook" to catch signals.
3544 // The user-defined signal handler must pass unrecognized signals to this
3545 // routine, and if it returns true (non-zero), then the signal handler must
3546 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3547 // routine will never retun false (zero), but instead will execute a VM panic
3548 // routine kill the process.
3549 //
3550 // If this routine returns false, it is OK to call it again. This allows
3551 // the user-defined signal handler to perform checks either before or after
3552 // the VM performs its own checks. Naturally, the user code would be making
3553 // a serious error if it tried to handle an exception (such as a null check
3554 // or breakpoint) that the VM was generating for its own correct operation.
3555 //
3556 // This routine may recognize any of the following kinds of signals:
3557 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3558 // ASYNC_SIGNAL.
3559 // It should be consulted by handlers for any of those signals.
3560 //
3561 // The caller of this routine must pass in the three arguments supplied
3562 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3563 // field of the structure passed to sigaction(). This routine assumes that
3564 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3565 //
3566 // Note that the VM will print warnings if it detects conflicting signal
3567 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3568 //
3569 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3570 siginfo_t* siginfo,
3571 void* ucontext,
3572 int abort_if_unrecognized);
3573
3574
3575 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3576 int orig_errno = errno; // Preserve errno value over signal handler.
3577 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3578 errno = orig_errno;
3579 }
3580
3581 // This boolean allows users to forward their own non-matching signals
3582 // to JVM_handle_solaris_signal, harmlessly.
3583 bool os::Solaris::signal_handlers_are_installed = false;
3584
3585 // For signal-chaining
3586 bool os::Solaris::libjsig_is_loaded = false;
3587 typedef struct sigaction *(*get_signal_t)(int);
3588 get_signal_t os::Solaris::get_signal_action = NULL;
3589
3590 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3591 struct sigaction *actp = NULL;
3592
3593 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3594 // Retrieve the old signal handler from libjsig
3595 actp = (*get_signal_action)(sig);
3596 }
3597 if (actp == NULL) {
3598 // Retrieve the preinstalled signal handler from jvm
3599 actp = os::Posix::get_preinstalled_handler(sig);
3600 }
3601
3602 return actp;
3603 }
3604
3605 static bool call_chained_handler(struct sigaction *actp, int sig,
3606 siginfo_t *siginfo, void *context) {
3607 // Call the old signal handler
3608 if (actp->sa_handler == SIG_DFL) {
3609 // It's more reasonable to let jvm treat it as an unexpected exception
3610 // instead of taking the default action.
3611 return false;
3612 } else if (actp->sa_handler != SIG_IGN) {
3613 if ((actp->sa_flags & SA_NODEFER) == 0) {
3614 // automaticlly block the signal
3615 sigaddset(&(actp->sa_mask), sig);
3616 }
3617
3618 sa_handler_t hand;
3619 sa_sigaction_t sa;
3620 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3621 // retrieve the chained handler
3622 if (siginfo_flag_set) {
3623 sa = actp->sa_sigaction;
3624 } else {
3625 hand = actp->sa_handler;
3626 }
3627
3628 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3629 actp->sa_handler = SIG_DFL;
3630 }
3631
3632 // try to honor the signal mask
3633 sigset_t oset;
3634 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3635
3636 // call into the chained handler
3637 if (siginfo_flag_set) {
3638 (*sa)(sig, siginfo, context);
3639 } else {
3640 (*hand)(sig);
3641 }
3642
3643 // restore the signal mask
3644 pthread_sigmask(SIG_SETMASK, &oset, 0);
3645 }
3646 // Tell jvm's signal handler the signal is taken care of.
3647 return true;
3648 }
3649
3650 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3651 bool chained = false;
3652 // signal-chaining
3653 if (UseSignalChaining) {
3654 struct sigaction *actp = get_chained_signal_action(sig);
3655 if (actp != NULL) {
3656 chained = call_chained_handler(actp, sig, siginfo, context);
3657 }
3658 }
3659 return chained;
3660 }
3661
3662 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3663 bool oktochain) {
3664 // Check for overwrite.
3665 struct sigaction oldAct;
3666 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3667 void* oldhand =
3668 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3669 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3670 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3671 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3672 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3673 if (AllowUserSignalHandlers || !set_installed) {
3674 // Do not overwrite; user takes responsibility to forward to us.
3675 return;
3676 } else if (UseSignalChaining) {
3677 if (oktochain) {
3678 // save the old handler in jvm
3679 os::Posix::save_preinstalled_handler(sig, oldAct);
3680 } else {
3681 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3682 }
3683 // libjsig also interposes the sigaction() call below and saves the
3684 // old sigaction on it own.
3685 } else {
3686 fatal("Encountered unexpected pre-existing sigaction handler "
3687 "%#lx for signal %d.", (long)oldhand, sig);
3688 }
3689 }
3690
3691 struct sigaction sigAct;
3692 sigfillset(&(sigAct.sa_mask));
3693 sigAct.sa_handler = SIG_DFL;
3694
3695 sigAct.sa_sigaction = signalHandler;
3696 // Handle SIGSEGV on alternate signal stack if
3697 // not using stack banging
3698 if (!UseStackBanging && sig == SIGSEGV) {
3699 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3700 } else {
3701 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3702 }
3703 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3704
3705 sigaction(sig, &sigAct, &oldAct);
3706
3707 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3708 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3709 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3710 }
3711
3712
3713 #define DO_SIGNAL_CHECK(sig) \
3714 do { \
3715 if (!sigismember(&check_signal_done, sig)) { \
3716 os::Solaris::check_signal_handler(sig); \
3717 } \
3718 } while (0)
3719
3720 // This method is a periodic task to check for misbehaving JNI applications
3721 // under CheckJNI, we can add any periodic checks here
3722
3723 void os::run_periodic_checks() {
3724 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3725 // thereby preventing a NULL checks.
3726 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3727
3728 if (check_signals == false) return;
3729
3730 // SEGV and BUS if overridden could potentially prevent
3731 // generation of hs*.log in the event of a crash, debugging
3732 // such a case can be very challenging, so we absolutely
3733 // check for the following for a good measure:
3734 DO_SIGNAL_CHECK(SIGSEGV);
3735 DO_SIGNAL_CHECK(SIGILL);
3736 DO_SIGNAL_CHECK(SIGFPE);
3737 DO_SIGNAL_CHECK(SIGBUS);
3738 DO_SIGNAL_CHECK(SIGPIPE);
3739 DO_SIGNAL_CHECK(SIGXFSZ);
3740 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3741
3742 // ReduceSignalUsage allows the user to override these handlers
3743 // see comments at the very top and jvm_solaris.h
3744 if (!ReduceSignalUsage) {
3745 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3746 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3747 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3748 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3749 }
3750 }
3751
3752 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3753
3754 static os_sigaction_t os_sigaction = NULL;
3755
3756 void os::Solaris::check_signal_handler(int sig) {
3757 char buf[O_BUFLEN];
3758 address jvmHandler = NULL;
3759
3760 struct sigaction act;
3761 if (os_sigaction == NULL) {
3762 // only trust the default sigaction, in case it has been interposed
3763 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3764 if (os_sigaction == NULL) return;
3765 }
3766
3767 os_sigaction(sig, (struct sigaction*)NULL, &act);
3768
3769 address thisHandler = (act.sa_flags & SA_SIGINFO)
3770 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3771 : CAST_FROM_FN_PTR(address, act.sa_handler);
3772
3773
3774 switch (sig) {
3775 case SIGSEGV:
3776 case SIGBUS:
3777 case SIGFPE:
3778 case SIGPIPE:
3779 case SIGXFSZ:
3780 case SIGILL:
3781 case ASYNC_SIGNAL:
3782 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3783 break;
3784
3785 case SHUTDOWN1_SIGNAL:
3786 case SHUTDOWN2_SIGNAL:
3787 case SHUTDOWN3_SIGNAL:
3788 case BREAK_SIGNAL:
3789 jvmHandler = (address)user_handler();
3790 break;
3791
3792 default:
3793 return;
3794 }
3795
3796 if (thisHandler != jvmHandler) {
3797 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3798 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3799 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3800 // No need to check this sig any longer
3801 sigaddset(&check_signal_done, sig);
3802 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3803 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3804 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3805 exception_name(sig, buf, O_BUFLEN));
3806 }
3807 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3808 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3809 tty->print("expected:");
3810 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3811 tty->cr();
3812 tty->print(" found:");
3813 os::Posix::print_sa_flags(tty, act.sa_flags);
3814 tty->cr();
3815 // No need to check this sig any longer
3816 sigaddset(&check_signal_done, sig);
3817 }
3818
3819 // Print all the signal handler state
3820 if (sigismember(&check_signal_done, sig)) {
3821 print_signal_handlers(tty, buf, O_BUFLEN);
3822 }
3823
3824 }
3825
3826 void os::Solaris::install_signal_handlers() {
3827 signal_handlers_are_installed = true;
3828
3829 // signal-chaining
3830 typedef void (*signal_setting_t)();
3831 signal_setting_t begin_signal_setting = NULL;
3832 signal_setting_t end_signal_setting = NULL;
3833 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3834 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3835 if (begin_signal_setting != NULL) {
3836 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3837 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3838 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3839 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3840 libjsig_is_loaded = true;
3841 assert(UseSignalChaining, "should enable signal-chaining");
3842 }
3843 if (libjsig_is_loaded) {
3844 // Tell libjsig jvm is setting signal handlers
3845 (*begin_signal_setting)();
3846 }
3847
3848 set_signal_handler(SIGSEGV, true, true);
3849 set_signal_handler(SIGPIPE, true, true);
3850 set_signal_handler(SIGXFSZ, true, true);
3851 set_signal_handler(SIGBUS, true, true);
3852 set_signal_handler(SIGILL, true, true);
3853 set_signal_handler(SIGFPE, true, true);
3854 set_signal_handler(ASYNC_SIGNAL, true, true);
3855
3856 if (libjsig_is_loaded) {
3857 // Tell libjsig jvm finishes setting signal handlers
3858 (*end_signal_setting)();
3859 }
3860
3861 // We don't activate signal checker if libjsig is in place, we trust ourselves
3862 // and if UserSignalHandler is installed all bets are off.
3863 // Log that signal checking is off only if -verbose:jni is specified.
3864 if (CheckJNICalls) {
3865 if (libjsig_is_loaded) {
3866 if (PrintJNIResolving) {
3867 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3868 }
3869 check_signals = false;
3870 }
3871 if (AllowUserSignalHandlers) {
3872 if (PrintJNIResolving) {
3873 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3874 }
3875 check_signals = false;
3876 }
3877 }
3878 }
3879
3880
3881 void report_error(const char* file_name, int line_no, const char* title,
3882 const char* format, ...);
3883
3884 // (Static) wrappers for the liblgrp API
3885 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
3886 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
3887 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
3888 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
3889 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
3890 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
3891 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
3892 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
3893 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
3894
3895 static address resolve_symbol_lazy(const char* name) {
3896 address addr = (address) dlsym(RTLD_DEFAULT, name);
3897 if (addr == NULL) {
3898 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
3899 addr = (address) dlsym(RTLD_NEXT, name);
3900 }
3901 return addr;
3902 }
3903
3904 static address resolve_symbol(const char* name) {
3905 address addr = resolve_symbol_lazy(name);
3906 if (addr == NULL) {
3907 fatal(dlerror());
3908 }
3909 return addr;
3910 }
3911
3912 void os::Solaris::libthread_init() {
3913 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
3914
3915 lwp_priocntl_init();
3916
3917 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
3918 if (func == NULL) {
3919 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
3920 // Guarantee that this VM is running on an new enough OS (5.6 or
3921 // later) that it will have a new enough libthread.so.
3922 guarantee(func != NULL, "libthread.so is too old.");
3923 }
3924
3925 int size;
3926 void (*handler_info_func)(address *, int *);
3927 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
3928 handler_info_func(&handler_start, &size);
3929 handler_end = handler_start + size;
3930 }
3931
3932
3933 int_fnP_mutex_tP os::Solaris::_mutex_lock;
3934 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
3935 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
3936 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
3937 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
3938 int os::Solaris::_mutex_scope = USYNC_THREAD;
3939
3940 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
3941 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
3942 int_fnP_cond_tP os::Solaris::_cond_signal;
3943 int_fnP_cond_tP os::Solaris::_cond_broadcast;
3944 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
3945 int_fnP_cond_tP os::Solaris::_cond_destroy;
3946 int os::Solaris::_cond_scope = USYNC_THREAD;
3947 bool os::Solaris::_synchronization_initialized;
3948
3949 void os::Solaris::synchronization_init() {
3950 if (UseLWPSynchronization) {
3951 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
3952 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
3953 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
3954 os::Solaris::set_mutex_init(lwp_mutex_init);
3955 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
3956 os::Solaris::set_mutex_scope(USYNC_THREAD);
3957
3958 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
3959 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
3960 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
3961 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
3962 os::Solaris::set_cond_init(lwp_cond_init);
3963 os::Solaris::set_cond_destroy(lwp_cond_destroy);
3964 os::Solaris::set_cond_scope(USYNC_THREAD);
3965 } else {
3966 os::Solaris::set_mutex_scope(USYNC_THREAD);
3967 os::Solaris::set_cond_scope(USYNC_THREAD);
3968
3969 if (UsePthreads) {
3970 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
3971 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
3972 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
3973 os::Solaris::set_mutex_init(pthread_mutex_default_init);
3974 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
3975
3976 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
3977 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
3978 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
3979 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
3980 os::Solaris::set_cond_init(pthread_cond_default_init);
3981 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
3982 } else {
3983 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
3984 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
3985 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
3986 os::Solaris::set_mutex_init(::mutex_init);
3987 os::Solaris::set_mutex_destroy(::mutex_destroy);
3988
3989 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
3990 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
3991 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
3992 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
3993 os::Solaris::set_cond_init(::cond_init);
3994 os::Solaris::set_cond_destroy(::cond_destroy);
3995 }
3996 }
3997 _synchronization_initialized = true;
3998 }
3999
4000 bool os::Solaris::liblgrp_init() {
4001 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4002 if (handle != NULL) {
4003 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4004 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4005 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4006 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4007 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4008 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4009 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4010 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4011 dlsym(handle, "lgrp_cookie_stale")));
4012
4013 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4014 set_lgrp_cookie(c);
4015 return true;
4016 }
4017 return false;
4018 }
4019
4020 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4021 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4022 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4023
4024 void init_pset_getloadavg_ptr(void) {
4025 pset_getloadavg_ptr =
4026 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4027 if (pset_getloadavg_ptr == NULL) {
4028 log_warning(os)("pset_getloadavg function not found");
4029 }
4030 }
4031
4032 int os::Solaris::_dev_zero_fd = -1;
4033
4034 // this is called _before_ the global arguments have been parsed
4035 void os::init(void) {
4036 _initial_pid = getpid();
4037
4038 max_hrtime = first_hrtime = gethrtime();
4039
4040 init_random(1234567);
4041
4042 page_size = sysconf(_SC_PAGESIZE);
4043 if (page_size == -1) {
4044 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4045 }
4046 init_page_sizes((size_t) page_size);
4047
4048 Solaris::initialize_system_info();
4049
4050 int fd = ::open("/dev/zero", O_RDWR);
4051 if (fd < 0) {
4052 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4053 } else {
4054 Solaris::set_dev_zero_fd(fd);
4055
4056 // Close on exec, child won't inherit.
4057 fcntl(fd, F_SETFD, FD_CLOEXEC);
4058 }
4059
4060 clock_tics_per_sec = CLK_TCK;
4061
4062 // check if dladdr1() exists; dladdr1 can provide more information than
4063 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4064 // and is available on linker patches for 5.7 and 5.8.
4065 // libdl.so must have been loaded, this call is just an entry lookup
4066 void * hdl = dlopen("libdl.so", RTLD_NOW);
4067 if (hdl) {
4068 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4069 }
4070
4071 // main_thread points to the thread that created/loaded the JVM.
4072 main_thread = thr_self();
4073
4074 // dynamic lookup of functions that may not be available in our lowest
4075 // supported Solaris release
4076 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4077 if (handle != NULL) {
4078 Solaris::_pthread_setname_np = // from 11.3
4079 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4080 }
4081
4082 // Shared Posix initialization
4083 os::Posix::init();
4084 }
4085
4086 // To install functions for atexit system call
4087 extern "C" {
4088 static void perfMemory_exit_helper() {
4089 perfMemory_exit();
4090 }
4091 }
4092
4093 // this is called _after_ the global arguments have been parsed
4094 jint os::init_2(void) {
4095 // try to enable extended file IO ASAP, see 6431278
4096 os::Solaris::try_enable_extended_io();
4097
4098 // Check and sets minimum stack sizes against command line options
4099 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4100 return JNI_ERR;
4101 }
4102
4103 Solaris::libthread_init();
4104
4105 if (UseNUMA) {
4106 if (!Solaris::liblgrp_init()) {
4107 UseNUMA = false;
4108 } else {
4109 size_t lgrp_limit = os::numa_get_groups_num();
4110 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4111 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4112 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4113 if (lgrp_num < 2) {
4114 // There's only one locality group, disable NUMA.
4115 UseNUMA = false;
4116 }
4117 }
4118 if (!UseNUMA && ForceNUMA) {
4119 UseNUMA = true;
4120 }
4121 }
4122
4123 Solaris::signal_sets_init();
4124 Solaris::init_signal_mem();
4125 Solaris::install_signal_handlers();
4126 // Initialize data for jdk.internal.misc.Signal
4127 if (!ReduceSignalUsage) {
4128 jdk_misc_signal_init();
4129 }
4130
4131 // initialize synchronization primitives to use either thread or
4132 // lwp synchronization (controlled by UseLWPSynchronization)
4133 Solaris::synchronization_init();
4134 DEBUG_ONLY(os::set_mutex_init_done();)
4135
4136 if (MaxFDLimit) {
4137 // set the number of file descriptors to max. print out error
4138 // if getrlimit/setrlimit fails but continue regardless.
4139 struct rlimit nbr_files;
4140 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4141 if (status != 0) {
4142 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4143 } else {
4144 nbr_files.rlim_cur = nbr_files.rlim_max;
4145 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4146 if (status != 0) {
4147 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4148 }
4149 }
4150 }
4151
4152 // Calculate theoretical max. size of Threads to guard gainst
4153 // artifical out-of-memory situations, where all available address-
4154 // space has been reserved by thread stacks. Default stack size is 1Mb.
4155 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4156 JavaThread::stack_size_at_create() : (1*K*K);
4157 assert(pre_thread_stack_size != 0, "Must have a stack");
4158 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4159 // we should start doing Virtual Memory banging. Currently when the threads will
4160 // have used all but 200Mb of space.
4161 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4162 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4163
4164 // at-exit methods are called in the reverse order of their registration.
4165 // In Solaris 7 and earlier, atexit functions are called on return from
4166 // main or as a result of a call to exit(3C). There can be only 32 of
4167 // these functions registered and atexit() does not set errno. In Solaris
4168 // 8 and later, there is no limit to the number of functions registered
4169 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4170 // functions are called upon dlclose(3DL) in addition to return from main
4171 // and exit(3C).
4172
4173 if (PerfAllowAtExitRegistration) {
4174 // only register atexit functions if PerfAllowAtExitRegistration is set.
4175 // atexit functions can be delayed until process exit time, which
4176 // can be problematic for embedded VM situations. Embedded VMs should
4177 // call DestroyJavaVM() to assure that VM resources are released.
4178
4179 // note: perfMemory_exit_helper atexit function may be removed in
4180 // the future if the appropriate cleanup code can be added to the
4181 // VM_Exit VMOperation's doit method.
4182 if (atexit(perfMemory_exit_helper) != 0) {
4183 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4184 }
4185 }
4186
4187 // Init pset_loadavg function pointer
4188 init_pset_getloadavg_ptr();
4189
4190 // Shared Posix initialization
4191 os::Posix::init_2();
4192
4193 return JNI_OK;
4194 }
4195
4196 // Mark the polling page as unreadable
4197 void os::make_polling_page_unreadable(void) {
4198 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4199 fatal("Could not disable polling page");
4200 }
4201 }
4202
4203 // Mark the polling page as readable
4204 void os::make_polling_page_readable(void) {
4205 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4206 fatal("Could not enable polling page");
4207 }
4208 }
4209
4210 // Is a (classpath) directory empty?
4211 bool os::dir_is_empty(const char* path) {
4212 DIR *dir = NULL;
4213 struct dirent *ptr;
4214
4215 dir = opendir(path);
4216 if (dir == NULL) return true;
4217
4218 // Scan the directory
4219 bool result = true;
4220 while (result && (ptr = readdir(dir)) != NULL) {
4221 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4222 result = false;
4223 }
4224 }
4225 closedir(dir);
4226 return result;
4227 }
4228
4229 // This code originates from JDK's sysOpen and open64_w
4230 // from src/solaris/hpi/src/system_md.c
4231
4232 int os::open(const char *path, int oflag, int mode) {
4233 if (strlen(path) > MAX_PATH - 1) {
4234 errno = ENAMETOOLONG;
4235 return -1;
4236 }
4237 int fd;
4238
4239 fd = ::open64(path, oflag, mode);
4240 if (fd == -1) return -1;
4241
4242 // If the open succeeded, the file might still be a directory
4243 {
4244 struct stat64 buf64;
4245 int ret = ::fstat64(fd, &buf64);
4246 int st_mode = buf64.st_mode;
4247
4248 if (ret != -1) {
4249 if ((st_mode & S_IFMT) == S_IFDIR) {
4250 errno = EISDIR;
4251 ::close(fd);
4252 return -1;
4253 }
4254 } else {
4255 ::close(fd);
4256 return -1;
4257 }
4258 }
4259
4260 // 32-bit Solaris systems suffer from:
4261 //
4262 // - an historical default soft limit of 256 per-process file
4263 // descriptors that is too low for many Java programs.
4264 //
4265 // - a design flaw where file descriptors created using stdio
4266 // fopen must be less than 256, _even_ when the first limit above
4267 // has been raised. This can cause calls to fopen (but not calls to
4268 // open, for example) to fail mysteriously, perhaps in 3rd party
4269 // native code (although the JDK itself uses fopen). One can hardly
4270 // criticize them for using this most standard of all functions.
4271 //
4272 // We attempt to make everything work anyways by:
4273 //
4274 // - raising the soft limit on per-process file descriptors beyond
4275 // 256
4276 //
4277 // - As of Solaris 10u4, we can request that Solaris raise the 256
4278 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4279 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4280 //
4281 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4282 // workaround the bug by remapping non-stdio file descriptors below
4283 // 256 to ones beyond 256, which is done below.
4284 //
4285 // See:
4286 // 1085341: 32-bit stdio routines should support file descriptors >255
4287 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4288 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4289 // enable_extended_FILE_stdio() in VM initialisation
4290 // Giri Mandalika's blog
4291 // http://technopark02.blogspot.com/2005_05_01_archive.html
4292 //
4293 #ifndef _LP64
4294 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4295 int newfd = ::fcntl(fd, F_DUPFD, 256);
4296 if (newfd != -1) {
4297 ::close(fd);
4298 fd = newfd;
4299 }
4300 }
4301 #endif // 32-bit Solaris
4302
4303 // All file descriptors that are opened in the JVM and not
4304 // specifically destined for a subprocess should have the
4305 // close-on-exec flag set. If we don't set it, then careless 3rd
4306 // party native code might fork and exec without closing all
4307 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4308 // UNIXProcess.c), and this in turn might:
4309 //
4310 // - cause end-of-file to fail to be detected on some file
4311 // descriptors, resulting in mysterious hangs, or
4312 //
4313 // - might cause an fopen in the subprocess to fail on a system
4314 // suffering from bug 1085341.
4315 //
4316 // (Yes, the default setting of the close-on-exec flag is a Unix
4317 // design flaw)
4318 //
4319 // See:
4320 // 1085341: 32-bit stdio routines should support file descriptors >255
4321 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4322 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4323 //
4324 #ifdef FD_CLOEXEC
4325 {
4326 int flags = ::fcntl(fd, F_GETFD);
4327 if (flags != -1) {
4328 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4329 }
4330 }
4331 #endif
4332
4333 return fd;
4334 }
4335
4336 // create binary file, rewriting existing file if required
4337 int os::create_binary_file(const char* path, bool rewrite_existing) {
4338 int oflags = O_WRONLY | O_CREAT;
4339 if (!rewrite_existing) {
4340 oflags |= O_EXCL;
4341 }
4342 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4343 }
4344
4345 // return current position of file pointer
4346 jlong os::current_file_offset(int fd) {
4347 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4348 }
4349
4350 // move file pointer to the specified offset
4351 jlong os::seek_to_file_offset(int fd, jlong offset) {
4352 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4353 }
4354
4355 jlong os::lseek(int fd, jlong offset, int whence) {
4356 return (jlong) ::lseek64(fd, offset, whence);
4357 }
4358
4359 int os::ftruncate(int fd, jlong length) {
4360 return ::ftruncate64(fd, length);
4361 }
4362
4363 int os::fsync(int fd) {
4364 RESTARTABLE_RETURN_INT(::fsync(fd));
4365 }
4366
4367 int os::available(int fd, jlong *bytes) {
4368 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4369 "Assumed _thread_in_native");
4370 jlong cur, end;
4371 int mode;
4372 struct stat64 buf64;
4373
4374 if (::fstat64(fd, &buf64) >= 0) {
4375 mode = buf64.st_mode;
4376 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4377 int n,ioctl_return;
4378
4379 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4380 if (ioctl_return>= 0) {
4381 *bytes = n;
4382 return 1;
4383 }
4384 }
4385 }
4386 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4387 return 0;
4388 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4389 return 0;
4390 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4391 return 0;
4392 }
4393 *bytes = end - cur;
4394 return 1;
4395 }
4396
4397 // Map a block of memory.
4398 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4399 char *addr, size_t bytes, bool read_only,
4400 bool allow_exec) {
4401 int prot;
4402 int flags;
4403
4404 if (read_only) {
4405 prot = PROT_READ;
4406 flags = MAP_SHARED;
4407 } else {
4408 prot = PROT_READ | PROT_WRITE;
4409 flags = MAP_PRIVATE;
4410 }
4411
4412 if (allow_exec) {
4413 prot |= PROT_EXEC;
4414 }
4415
4416 if (addr != NULL) {
4417 flags |= MAP_FIXED;
4418 }
4419
4420 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4421 fd, file_offset);
4422 if (mapped_address == MAP_FAILED) {
4423 return NULL;
4424 }
4425 return mapped_address;
4426 }
4427
4428
4429 // Remap a block of memory.
4430 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4431 char *addr, size_t bytes, bool read_only,
4432 bool allow_exec) {
4433 // same as map_memory() on this OS
4434 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4435 allow_exec);
4436 }
4437
4438
4439 // Unmap a block of memory.
4440 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4441 return munmap(addr, bytes) == 0;
4442 }
4443
4444 void os::pause() {
4445 char filename[MAX_PATH];
4446 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4447 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4448 } else {
4449 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4450 }
4451
4452 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4453 if (fd != -1) {
4454 struct stat buf;
4455 ::close(fd);
4456 while (::stat(filename, &buf) == 0) {
4457 (void)::poll(NULL, 0, 100);
4458 }
4459 } else {
4460 jio_fprintf(stderr,
4461 "Could not open pause file '%s', continuing immediately.\n", filename);
4462 }
4463 }
4464
4465 #ifndef PRODUCT
4466 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4467 // Turn this on if you need to trace synch operations.
4468 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4469 // and call record_synch_enable and record_synch_disable
4470 // around the computation of interest.
4471
4472 void record_synch(char* name, bool returning); // defined below
4473
4474 class RecordSynch {
4475 char* _name;
4476 public:
4477 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4478 ~RecordSynch() { record_synch(_name, true); }
4479 };
4480
4481 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4482 extern "C" ret name params { \
4483 typedef ret name##_t params; \
4484 static name##_t* implem = NULL; \
4485 static int callcount = 0; \
4486 if (implem == NULL) { \
4487 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4488 if (implem == NULL) fatal(dlerror()); \
4489 } \
4490 ++callcount; \
4491 RecordSynch _rs(#name); \
4492 inner; \
4493 return implem args; \
4494 }
4495 // in dbx, examine callcounts this way:
4496 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4497
4498 #define CHECK_POINTER_OK(p) \
4499 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4500 #define CHECK_MU \
4501 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4502 #define CHECK_CV \
4503 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4504 #define CHECK_P(p) \
4505 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4506
4507 #define CHECK_MUTEX(mutex_op) \
4508 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4509
4510 CHECK_MUTEX( mutex_lock)
4511 CHECK_MUTEX( _mutex_lock)
4512 CHECK_MUTEX( mutex_unlock)
4513 CHECK_MUTEX(_mutex_unlock)
4514 CHECK_MUTEX( mutex_trylock)
4515 CHECK_MUTEX(_mutex_trylock)
4516
4517 #define CHECK_COND(cond_op) \
4518 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4519
4520 CHECK_COND( cond_wait);
4521 CHECK_COND(_cond_wait);
4522 CHECK_COND(_cond_wait_cancel);
4523
4524 #define CHECK_COND2(cond_op) \
4525 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4526
4527 CHECK_COND2( cond_timedwait);
4528 CHECK_COND2(_cond_timedwait);
4529 CHECK_COND2(_cond_timedwait_cancel);
4530
4531 // do the _lwp_* versions too
4532 #define mutex_t lwp_mutex_t
4533 #define cond_t lwp_cond_t
4534 CHECK_MUTEX( _lwp_mutex_lock)
4535 CHECK_MUTEX( _lwp_mutex_unlock)
4536 CHECK_MUTEX( _lwp_mutex_trylock)
4537 CHECK_MUTEX( __lwp_mutex_lock)
4538 CHECK_MUTEX( __lwp_mutex_unlock)
4539 CHECK_MUTEX( __lwp_mutex_trylock)
4540 CHECK_MUTEX(___lwp_mutex_lock)
4541 CHECK_MUTEX(___lwp_mutex_unlock)
4542
4543 CHECK_COND( _lwp_cond_wait);
4544 CHECK_COND( __lwp_cond_wait);
4545 CHECK_COND(___lwp_cond_wait);
4546
4547 CHECK_COND2( _lwp_cond_timedwait);
4548 CHECK_COND2( __lwp_cond_timedwait);
4549 #undef mutex_t
4550 #undef cond_t
4551
4552 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4553 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4554 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4555 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4556 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4557 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4558 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4559 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4560
4561
4562 // recording machinery:
4563
4564 enum { RECORD_SYNCH_LIMIT = 200 };
4565 char* record_synch_name[RECORD_SYNCH_LIMIT];
4566 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4567 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4568 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4569 int record_synch_count = 0;
4570 bool record_synch_enabled = false;
4571
4572 // in dbx, examine recorded data this way:
4573 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4574
4575 void record_synch(char* name, bool returning) {
4576 if (record_synch_enabled) {
4577 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4578 record_synch_name[record_synch_count] = name;
4579 record_synch_returning[record_synch_count] = returning;
4580 record_synch_thread[record_synch_count] = thr_self();
4581 record_synch_arg0ptr[record_synch_count] = &name;
4582 record_synch_count++;
4583 }
4584 // put more checking code here:
4585 // ...
4586 }
4587 }
4588
4589 void record_synch_enable() {
4590 // start collecting trace data, if not already doing so
4591 if (!record_synch_enabled) record_synch_count = 0;
4592 record_synch_enabled = true;
4593 }
4594
4595 void record_synch_disable() {
4596 // stop collecting trace data
4597 record_synch_enabled = false;
4598 }
4599
4600 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4601 #endif // PRODUCT
4602
4603 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4604 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4605 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4606
4607
4608 // JVMTI & JVM monitoring and management support
4609 // The thread_cpu_time() and current_thread_cpu_time() are only
4610 // supported if is_thread_cpu_time_supported() returns true.
4611 // They are not supported on Solaris T1.
4612
4613 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4614 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4615 // of a thread.
4616 //
4617 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4618 // returns the fast estimate available on the platform.
4619
4620 // hrtime_t gethrvtime() return value includes
4621 // user time but does not include system time
4622 jlong os::current_thread_cpu_time() {
4623 return (jlong) gethrvtime();
4624 }
4625
4626 jlong os::thread_cpu_time(Thread *thread) {
4627 // return user level CPU time only to be consistent with
4628 // what current_thread_cpu_time returns.
4629 // thread_cpu_time_info() must be changed if this changes
4630 return os::thread_cpu_time(thread, false /* user time only */);
4631 }
4632
4633 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4634 if (user_sys_cpu_time) {
4635 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4636 } else {
4637 return os::current_thread_cpu_time();
4638 }
4639 }
4640
4641 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4642 char proc_name[64];
4643 int count;
4644 prusage_t prusage;
4645 jlong lwp_time;
4646 int fd;
4647
4648 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4649 getpid(),
4650 thread->osthread()->lwp_id());
4651 fd = ::open(proc_name, O_RDONLY);
4652 if (fd == -1) return -1;
4653
4654 do {
4655 count = ::pread(fd,
4656 (void *)&prusage.pr_utime,
4657 thr_time_size,
4658 thr_time_off);
4659 } while (count < 0 && errno == EINTR);
4660 ::close(fd);
4661 if (count < 0) return -1;
4662
4663 if (user_sys_cpu_time) {
4664 // user + system CPU time
4665 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4666 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4667 (jlong)prusage.pr_stime.tv_nsec +
4668 (jlong)prusage.pr_utime.tv_nsec;
4669 } else {
4670 // user level CPU time only
4671 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4672 (jlong)prusage.pr_utime.tv_nsec;
4673 }
4674
4675 return (lwp_time);
4676 }
4677
4678 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4679 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4680 info_ptr->may_skip_backward = false; // elapsed time not wall time
4681 info_ptr->may_skip_forward = false; // elapsed time not wall time
4682 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4683 }
4684
4685 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4686 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4687 info_ptr->may_skip_backward = false; // elapsed time not wall time
4688 info_ptr->may_skip_forward = false; // elapsed time not wall time
4689 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4690 }
4691
4692 bool os::is_thread_cpu_time_supported() {
4693 return true;
4694 }
4695
4696 // System loadavg support. Returns -1 if load average cannot be obtained.
4697 // Return the load average for our processor set if the primitive exists
4698 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4699 int os::loadavg(double loadavg[], int nelem) {
4700 if (pset_getloadavg_ptr != NULL) {
4701 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4702 } else {
4703 return ::getloadavg(loadavg, nelem);
4704 }
4705 }
4706
4707 //---------------------------------------------------------------------------------
4708
4709 bool os::find(address addr, outputStream* st) {
4710 Dl_info dlinfo;
4711 memset(&dlinfo, 0, sizeof(dlinfo));
4712 if (dladdr(addr, &dlinfo) != 0) {
4713 st->print(PTR_FORMAT ": ", addr);
4714 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4715 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4716 } else if (dlinfo.dli_fbase != NULL) {
4717 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4718 } else {
4719 st->print("<absolute address>");
4720 }
4721 if (dlinfo.dli_fname != NULL) {
4722 st->print(" in %s", dlinfo.dli_fname);
4723 }
4724 if (dlinfo.dli_fbase != NULL) {
4725 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4726 }
4727 st->cr();
4728
4729 if (Verbose) {
4730 // decode some bytes around the PC
4731 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4732 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4733 address lowest = (address) dlinfo.dli_sname;
4734 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4735 if (begin < lowest) begin = lowest;
4736 Dl_info dlinfo2;
4737 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4738 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4739 end = (address) dlinfo2.dli_saddr;
4740 }
4741 Disassembler::decode(begin, end, st);
4742 }
4743 return true;
4744 }
4745 return false;
4746 }
4747
4748 // Following function has been added to support HotSparc's libjvm.so running
4749 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4750 // src/solaris/hpi/native_threads in the EVM codebase.
4751 //
4752 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4753 // libraries and should thus be removed. We will leave it behind for a while
4754 // until we no longer want to able to run on top of 1.3.0 Solaris production
4755 // JDK. See 4341971.
4756
4757 #define STACK_SLACK 0x800
4758
4759 extern "C" {
4760 intptr_t sysThreadAvailableStackWithSlack() {
4761 stack_t st;
4762 intptr_t retval, stack_top;
4763 retval = thr_stksegment(&st);
4764 assert(retval == 0, "incorrect return value from thr_stksegment");
4765 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4766 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4767 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4768 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4769 }
4770 }
4771
4772 // ObjectMonitor park-unpark infrastructure ...
4773 //
4774 // We implement Solaris and Linux PlatformEvents with the
4775 // obvious condvar-mutex-flag triple.
4776 // Another alternative that works quite well is pipes:
4777 // Each PlatformEvent consists of a pipe-pair.
4778 // The thread associated with the PlatformEvent
4779 // calls park(), which reads from the input end of the pipe.
4780 // Unpark() writes into the other end of the pipe.
4781 // The write-side of the pipe must be set NDELAY.
4782 // Unfortunately pipes consume a large # of handles.
4783 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4784 // Using pipes for the 1st few threads might be workable, however.
4785 //
4786 // park() is permitted to return spuriously.
4787 // Callers of park() should wrap the call to park() in
4788 // an appropriate loop. A litmus test for the correct
4789 // usage of park is the following: if park() were modified
4790 // to immediately return 0 your code should still work,
4791 // albeit degenerating to a spin loop.
4792 //
4793 // In a sense, park()-unpark() just provides more polite spinning
4794 // and polling with the key difference over naive spinning being
4795 // that a parked thread needs to be explicitly unparked() in order
4796 // to wake up and to poll the underlying condition.
4797 //
4798 // Assumption:
4799 // Only one parker can exist on an event, which is why we allocate
4800 // them per-thread. Multiple unparkers can coexist.
4801 //
4802 // _Event transitions in park()
4803 // -1 => -1 : illegal
4804 // 1 => 0 : pass - return immediately
4805 // 0 => -1 : block; then set _Event to 0 before returning
4806 //
4807 // _Event transitions in unpark()
4808 // 0 => 1 : just return
4809 // 1 => 1 : just return
4810 // -1 => either 0 or 1; must signal target thread
4811 // That is, we can safely transition _Event from -1 to either
4812 // 0 or 1.
4813 //
4814 // _Event serves as a restricted-range semaphore.
4815 // -1 : thread is blocked, i.e. there is a waiter
4816 // 0 : neutral: thread is running or ready,
4817 // could have been signaled after a wait started
4818 // 1 : signaled - thread is running or ready
4819 //
4820 // Another possible encoding of _Event would be with
4821 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4822 //
4823 // TODO-FIXME: add DTRACE probes for:
4824 // 1. Tx parks
4825 // 2. Ty unparks Tx
4826 // 3. Tx resumes from park
4827
4828
4829 // value determined through experimentation
4830 #define ROUNDINGFIX 11
4831
4832 // utility to compute the abstime argument to timedwait.
4833 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4834
4835 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4836 // millis is the relative timeout time
4837 // abstime will be the absolute timeout time
4838 if (millis < 0) millis = 0;
4839 struct timeval now;
4840 int status = gettimeofday(&now, NULL);
4841 assert(status == 0, "gettimeofday");
4842 jlong seconds = millis / 1000;
4843 jlong max_wait_period;
4844
4845 if (UseLWPSynchronization) {
4846 // forward port of fix for 4275818 (not sleeping long enough)
4847 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
4848 // _lwp_cond_timedwait() used a round_down algorithm rather
4849 // than a round_up. For millis less than our roundfactor
4850 // it rounded down to 0 which doesn't meet the spec.
4851 // For millis > roundfactor we may return a bit sooner, but
4852 // since we can not accurately identify the patch level and
4853 // this has already been fixed in Solaris 9 and 8 we will
4854 // leave it alone rather than always rounding down.
4855
4856 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
4857 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
4858 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
4859 max_wait_period = 21000000;
4860 } else {
4861 max_wait_period = 50000000;
4862 }
4863 millis %= 1000;
4864 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
4865 seconds = max_wait_period;
4866 }
4867 abstime->tv_sec = now.tv_sec + seconds;
4868 long usec = now.tv_usec + millis * 1000;
4869 if (usec >= 1000000) {
4870 abstime->tv_sec += 1;
4871 usec -= 1000000;
4872 }
4873 abstime->tv_nsec = usec * 1000;
4874 return abstime;
4875 }
4876
4877 void os::PlatformEvent::park() { // AKA: down()
4878 // Transitions for _Event:
4879 // -1 => -1 : illegal
4880 // 1 => 0 : pass - return immediately
4881 // 0 => -1 : block; then set _Event to 0 before returning
4882
4883 // Invariant: Only the thread associated with the Event/PlatformEvent
4884 // may call park().
4885 assert(_nParked == 0, "invariant");
4886
4887 int v;
4888 for (;;) {
4889 v = _Event;
4890 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4891 }
4892 guarantee(v >= 0, "invariant");
4893 if (v == 0) {
4894 // Do this the hard way by blocking ...
4895 // See http://monaco.sfbay/detail.jsf?cr=5094058.
4896 int status = os::Solaris::mutex_lock(_mutex);
4897 assert_status(status == 0, status, "mutex_lock");
4898 guarantee(_nParked == 0, "invariant");
4899 ++_nParked;
4900 while (_Event < 0) {
4901 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4902 // Treat this the same as if the wait was interrupted
4903 // With usr/lib/lwp going to kernel, always handle ETIME
4904 status = os::Solaris::cond_wait(_cond, _mutex);
4905 if (status == ETIME) status = EINTR;
4906 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4907 }
4908 --_nParked;
4909 _Event = 0;
4910 status = os::Solaris::mutex_unlock(_mutex);
4911 assert_status(status == 0, status, "mutex_unlock");
4912 // Paranoia to ensure our locked and lock-free paths interact
4913 // correctly with each other.
4914 OrderAccess::fence();
4915 }
4916 }
4917
4918 int os::PlatformEvent::park(jlong millis) {
4919 // Transitions for _Event:
4920 // -1 => -1 : illegal
4921 // 1 => 0 : pass - return immediately
4922 // 0 => -1 : block; then set _Event to 0 before returning
4923
4924 guarantee(_nParked == 0, "invariant");
4925 int v;
4926 for (;;) {
4927 v = _Event;
4928 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
4929 }
4930 guarantee(v >= 0, "invariant");
4931 if (v != 0) return OS_OK;
4932
4933 int ret = OS_TIMEOUT;
4934 timestruc_t abst;
4935 compute_abstime(&abst, millis);
4936
4937 // See http://monaco.sfbay/detail.jsf?cr=5094058.
4938 int status = os::Solaris::mutex_lock(_mutex);
4939 assert_status(status == 0, status, "mutex_lock");
4940 guarantee(_nParked == 0, "invariant");
4941 ++_nParked;
4942 while (_Event < 0) {
4943 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
4944 assert_status(status == 0 || status == EINTR ||
4945 status == ETIME || status == ETIMEDOUT,
4946 status, "cond_timedwait");
4947 if (!FilterSpuriousWakeups) break; // previous semantics
4948 if (status == ETIME || status == ETIMEDOUT) break;
4949 // We consume and ignore EINTR and spurious wakeups.
4950 }
4951 --_nParked;
4952 if (_Event >= 0) ret = OS_OK;
4953 _Event = 0;
4954 status = os::Solaris::mutex_unlock(_mutex);
4955 assert_status(status == 0, status, "mutex_unlock");
4956 // Paranoia to ensure our locked and lock-free paths interact
4957 // correctly with each other.
4958 OrderAccess::fence();
4959 return ret;
4960 }
4961
4962 void os::PlatformEvent::unpark() {
4963 // Transitions for _Event:
4964 // 0 => 1 : just return
4965 // 1 => 1 : just return
4966 // -1 => either 0 or 1; must signal target thread
4967 // That is, we can safely transition _Event from -1 to either
4968 // 0 or 1.
4969 // See also: "Semaphores in Plan 9" by Mullender & Cox
4970 //
4971 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4972 // that it will take two back-to-back park() calls for the owning
4973 // thread to block. This has the benefit of forcing a spurious return
4974 // from the first park() call after an unpark() call which will help
4975 // shake out uses of park() and unpark() without condition variables.
4976
4977 if (Atomic::xchg(1, &_Event) >= 0) return;
4978
4979 // If the thread associated with the event was parked, wake it.
4980 // Wait for the thread assoc with the PlatformEvent to vacate.
4981 int status = os::Solaris::mutex_lock(_mutex);
4982 assert_status(status == 0, status, "mutex_lock");
4983 int AnyWaiters = _nParked;
4984 status = os::Solaris::mutex_unlock(_mutex);
4985 assert_status(status == 0, status, "mutex_unlock");
4986 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4987 if (AnyWaiters != 0) {
4988 // Note that we signal() *after* dropping the lock for "immortal" Events.
4989 // This is safe and avoids a common class of futile wakeups. In rare
4990 // circumstances this can cause a thread to return prematurely from
4991 // cond_{timed}wait() but the spurious wakeup is benign and the victim
4992 // will simply re-test the condition and re-park itself.
4993 // This provides particular benefit if the underlying platform does not
4994 // provide wait morphing.
4995 status = os::Solaris::cond_signal(_cond);
4996 assert_status(status == 0, status, "cond_signal");
4997 }
4998 }
4999
5000 // JSR166
5001 // -------------------------------------------------------
5002
5003 // The solaris and linux implementations of park/unpark are fairly
5004 // conservative for now, but can be improved. They currently use a
5005 // mutex/condvar pair, plus _counter.
5006 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5007 // sets count to 1 and signals condvar. Only one thread ever waits
5008 // on the condvar. Contention seen when trying to park implies that someone
5009 // is unparking you, so don't wait. And spurious returns are fine, so there
5010 // is no need to track notifications.
5011
5012 #define MAX_SECS 100000000
5013
5014 // This code is common to linux and solaris and will be moved to a
5015 // common place in dolphin.
5016 //
5017 // The passed in time value is either a relative time in nanoseconds
5018 // or an absolute time in milliseconds. Either way it has to be unpacked
5019 // into suitable seconds and nanoseconds components and stored in the
5020 // given timespec structure.
5021 // Given time is a 64-bit value and the time_t used in the timespec is only
5022 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5023 // overflow if times way in the future are given. Further on Solaris versions
5024 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5025 // number of seconds, in abstime, is less than current_time + 100,000,000.
5026 // As it will be 28 years before "now + 100000000" will overflow we can
5027 // ignore overflow and just impose a hard-limit on seconds using the value
5028 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5029 // years from "now".
5030 //
5031 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5032 assert(time > 0, "convertTime");
5033
5034 struct timeval now;
5035 int status = gettimeofday(&now, NULL);
5036 assert(status == 0, "gettimeofday");
5037
5038 time_t max_secs = now.tv_sec + MAX_SECS;
5039
5040 if (isAbsolute) {
5041 jlong secs = time / 1000;
5042 if (secs > max_secs) {
5043 absTime->tv_sec = max_secs;
5044 } else {
5045 absTime->tv_sec = secs;
5046 }
5047 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5048 } else {
5049 jlong secs = time / NANOSECS_PER_SEC;
5050 if (secs >= MAX_SECS) {
5051 absTime->tv_sec = max_secs;
5052 absTime->tv_nsec = 0;
5053 } else {
5054 absTime->tv_sec = now.tv_sec + secs;
5055 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5056 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5057 absTime->tv_nsec -= NANOSECS_PER_SEC;
5058 ++absTime->tv_sec; // note: this must be <= max_secs
5059 }
5060 }
5061 }
5062 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5063 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5064 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5065 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5066 }
5067
5068 void Parker::park(bool isAbsolute, jlong time) {
5069 // Ideally we'd do something useful while spinning, such
5070 // as calling unpackTime().
5071
5072 // Optional fast-path check:
5073 // Return immediately if a permit is available.
5074 // We depend on Atomic::xchg() having full barrier semantics
5075 // since we are doing a lock-free update to _counter.
5076 if (Atomic::xchg(0, &_counter) > 0) return;
5077
5078 // Optional fast-exit: Check interrupt before trying to wait
5079 Thread* thread = Thread::current();
5080 assert(thread->is_Java_thread(), "Must be JavaThread");
5081 JavaThread *jt = (JavaThread *)thread;
5082 if (Thread::is_interrupted(thread, false)) {
5083 return;
5084 }
5085
5086 // First, demultiplex/decode time arguments
5087 timespec absTime;
5088 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5089 return;
5090 }
5091 if (time > 0) {
5092 // Warning: this code might be exposed to the old Solaris time
5093 // round-down bugs. Grep "roundingFix" for details.
5094 unpackTime(&absTime, isAbsolute, time);
5095 }
5096
5097 // Enter safepoint region
5098 // Beware of deadlocks such as 6317397.
5099 // The per-thread Parker:: _mutex is a classic leaf-lock.
5100 // In particular a thread must never block on the Threads_lock while
5101 // holding the Parker:: mutex. If safepoints are pending both the
5102 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5103 ThreadBlockInVM tbivm(jt);
5104
5105 // Don't wait if cannot get lock since interference arises from
5106 // unblocking. Also. check interrupt before trying wait
5107 if (Thread::is_interrupted(thread, false) ||
5108 os::Solaris::mutex_trylock(_mutex) != 0) {
5109 return;
5110 }
5111
5112 int status;
5113
5114 if (_counter > 0) { // no wait needed
5115 _counter = 0;
5116 status = os::Solaris::mutex_unlock(_mutex);
5117 assert(status == 0, "invariant");
5118 // Paranoia to ensure our locked and lock-free paths interact
5119 // correctly with each other and Java-level accesses.
5120 OrderAccess::fence();
5121 return;
5122 }
5123
5124 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5125 jt->set_suspend_equivalent();
5126 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5127
5128 // Do this the hard way by blocking ...
5129 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5130 if (time == 0) {
5131 status = os::Solaris::cond_wait(_cond, _mutex);
5132 } else {
5133 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5134 }
5135 // Note that an untimed cond_wait() can sometimes return ETIME on older
5136 // versions of the Solaris.
5137 assert_status(status == 0 || status == EINTR ||
5138 status == ETIME || status == ETIMEDOUT,
5139 status, "cond_timedwait");
5140
5141 _counter = 0;
5142 status = os::Solaris::mutex_unlock(_mutex);
5143 assert_status(status == 0, status, "mutex_unlock");
5144 // Paranoia to ensure our locked and lock-free paths interact
5145 // correctly with each other and Java-level accesses.
5146 OrderAccess::fence();
5147
5148 // If externally suspended while waiting, re-suspend
5149 if (jt->handle_special_suspend_equivalent_condition()) {
5150 jt->java_suspend_self();
5151 }
5152 }
5153
5154 void Parker::unpark() {
5155 int status = os::Solaris::mutex_lock(_mutex);
5156 assert(status == 0, "invariant");
5157 const int s = _counter;
5158 _counter = 1;
5159 status = os::Solaris::mutex_unlock(_mutex);
5160 assert(status == 0, "invariant");
5161
5162 if (s < 1) {
5163 status = os::Solaris::cond_signal(_cond);
5164 assert(status == 0, "invariant");
5165 }
5166 }
5167
5168 // Platform Monitor implementation
5169
5170 os::PlatformMonitor::PlatformMonitor() {
5171 int status = os::Solaris::cond_init(&_cond);
5172 assert_status(status == 0, status, "cond_init");
5173 status = os::Solaris::mutex_init(&_mutex);
5174 assert_status(status == 0, status, "mutex_init");
5175 }
5176
5177 os::PlatformMonitor::~PlatformMonitor() {
5178 int status = os::Solaris::cond_destroy(&_cond);
5179 assert_status(status == 0, status, "cond_destroy");
5180 status = os::Solaris::mutex_destroy(&_mutex);
5181 assert_status(status == 0, status, "mutex_destroy");
5182 }
5183
5184 void os::PlatformMonitor::lock() {
5185 int status = os::Solaris::mutex_lock(&_mutex);
5186 assert_status(status == 0, status, "mutex_lock");
5187 }
5188
5189 void os::PlatformMonitor::unlock() {
5190 int status = os::Solaris::mutex_unlock(&_mutex);
5191 assert_status(status == 0, status, "mutex_unlock");
5192 }
5193
5194 bool os::PlatformMonitor::try_lock() {
5195 int status = os::Solaris::mutex_trylock(&_mutex);
5196 assert_status(status == 0 || status == EBUSY, status, "mutex_trylock");
5197 return status == 0;
5198 }
5199
5200 // Must already be locked
5201 int os::PlatformMonitor::wait(jlong millis) {
5202 assert(millis >= 0, "negative timeout");
5203 if (millis > 0) {
5204 timestruc_t abst;
5205 int ret = OS_TIMEOUT;
5206 compute_abstime(&abst, millis);
5207 int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst);
5208 assert_status(status == 0 || status == EINTR ||
5209 status == ETIME || status == ETIMEDOUT,
5210 status, "cond_timedwait");
5211 // EINTR acts as spurious wakeup - which is permitted anyway
5212 if (status == 0 || status == EINTR) {
5213 ret = OS_OK;
5214 }
5215 return ret;
5216 } else {
5217 int status = os::Solaris::cond_wait(&_cond, &_mutex);
5218 assert_status(status == 0 || status == EINTR,
5219 status, "cond_wait");
5220 return OS_OK;
5221 }
5222 }
5223
5224 void os::PlatformMonitor::notify() {
5225 int status = os::Solaris::cond_signal(&_cond);
5226 assert_status(status == 0, status, "cond_signal");
5227 }
5228
5229 void os::PlatformMonitor::notify_all() {
5230 int status = os::Solaris::cond_broadcast(&_cond);
5231 assert_status(status == 0, status, "cond_broadcast");
5232 }
5233
5234 extern char** environ;
5235
5236 // Run the specified command in a separate process. Return its exit value,
5237 // or -1 on failure (e.g. can't fork a new process).
5238 // Unlike system(), this function can be called from signal handler. It
5239 // doesn't block SIGINT et al.
5240 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5241 char * argv[4];
5242 argv[0] = (char *)"sh";
5243 argv[1] = (char *)"-c";
5244 argv[2] = cmd;
5245 argv[3] = NULL;
5246
5247 // fork is async-safe, fork1 is not so can't use in signal handler
5248 pid_t pid;
5249 Thread* t = Thread::current_or_null_safe();
5250 if (t != NULL && t->is_inside_signal_handler()) {
5251 pid = fork();
5252 } else {
5253 pid = fork1();
5254 }
5255
5256 if (pid < 0) {
5257 // fork failed
5258 warning("fork failed: %s", os::strerror(errno));
5259 return -1;
5260
5261 } else if (pid == 0) {
5262 // child process
5263
5264 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5265 execve("/usr/bin/sh", argv, environ);
5266
5267 // execve failed
5268 _exit(-1);
5269
5270 } else {
5271 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5272 // care about the actual exit code, for now.
5273
5274 int status;
5275
5276 // Wait for the child process to exit. This returns immediately if
5277 // the child has already exited. */
5278 while (waitpid(pid, &status, 0) < 0) {
5279 switch (errno) {
5280 case ECHILD: return 0;
5281 case EINTR: break;
5282 default: return -1;
5283 }
5284 }
5285
5286 if (WIFEXITED(status)) {
5287 // The child exited normally; get its exit code.
5288 return WEXITSTATUS(status);
5289 } else if (WIFSIGNALED(status)) {
5290 // The child exited because of a signal
5291 // The best value to return is 0x80 + signal number,
5292 // because that is what all Unix shells do, and because
5293 // it allows callers to distinguish between process exit and
5294 // process death by signal.
5295 return 0x80 + WTERMSIG(status);
5296 } else {
5297 // Unknown exit code; pass it through
5298 return status;
5299 }
5300 }
5301 }
5302
5303 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5304 size_t res;
5305 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5306 return res;
5307 }
5308
5309 int os::close(int fd) {
5310 return ::close(fd);
5311 }
5312
5313 int os::socket_close(int fd) {
5314 return ::close(fd);
5315 }
5316
5317 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5318 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5319 "Assumed _thread_in_native");
5320 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5321 }
5322
5323 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5324 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5325 "Assumed _thread_in_native");
5326 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5327 }
5328
5329 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5330 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5331 }
5332
5333 // As both poll and select can be interrupted by signals, we have to be
5334 // prepared to restart the system call after updating the timeout, unless
5335 // a poll() is done with timeout == -1, in which case we repeat with this
5336 // "wait forever" value.
5337
5338 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5339 int _result;
5340 _result = ::connect(fd, him, len);
5341
5342 // On Solaris, when a connect() call is interrupted, the connection
5343 // can be established asynchronously (see 6343810). Subsequent calls
5344 // to connect() must check the errno value which has the semantic
5345 // described below (copied from the connect() man page). Handling
5346 // of asynchronously established connections is required for both
5347 // blocking and non-blocking sockets.
5348 // EINTR The connection attempt was interrupted
5349 // before any data arrived by the delivery of
5350 // a signal. The connection, however, will be
5351 // established asynchronously.
5352 //
5353 // EINPROGRESS The socket is non-blocking, and the connec-
5354 // tion cannot be completed immediately.
5355 //
5356 // EALREADY The socket is non-blocking, and a previous
5357 // connection attempt has not yet been com-
5358 // pleted.
5359 //
5360 // EISCONN The socket is already connected.
5361 if (_result == OS_ERR && errno == EINTR) {
5362 // restarting a connect() changes its errno semantics
5363 RESTARTABLE(::connect(fd, him, len), _result);
5364 // undo these changes
5365 if (_result == OS_ERR) {
5366 if (errno == EALREADY) {
5367 errno = EINPROGRESS; // fall through
5368 } else if (errno == EISCONN) {
5369 errno = 0;
5370 return OS_OK;
5371 }
5372 }
5373 }
5374 return _result;
5375 }
5376
5377 // Get the default path to the core file
5378 // Returns the length of the string
5379 int os::get_core_path(char* buffer, size_t bufferSize) {
5380 const char* p = get_current_directory(buffer, bufferSize);
5381
5382 if (p == NULL) {
5383 assert(p != NULL, "failed to get current directory");
5384 return 0;
5385 }
5386
5387 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5388 p, current_process_id());
5389
5390 return strlen(buffer);
5391 }
5392
5393 #ifndef PRODUCT
5394 void TestReserveMemorySpecial_test() {
5395 // No tests available for this platform
5396 }
5397 #endif
5398
5399 bool os::start_debugging(char *buf, int buflen) {
5400 int len = (int)strlen(buf);
5401 char *p = &buf[len];
5402
5403 jio_snprintf(p, buflen-len,
5404 "\n\n"
5405 "Do you want to debug the problem?\n\n"
5406 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5407 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5408 "Otherwise, press RETURN to abort...",
5409 os::current_process_id(), os::current_thread_id());
5410
5411 bool yes = os::message_box("Unexpected Error", buf);
5412
5413 if (yes) {
5414 // yes, user asked VM to launch debugger
5415 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5416
5417 os::fork_and_exec(buf);
5418 yes = false;
5419 }
5420 return yes;
5421 }