1 /*
2 * Copyright (c) 1997, 2017, 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 "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_solaris.h"
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.h"
43 #include "prims/jvm_misc.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/atomic.hpp"
46 #include "runtime/extendedPC.hpp"
47 #include "runtime/globals.hpp"
48 #include "runtime/interfaceSupport.hpp"
49 #include "runtime/java.hpp"
50 #include "runtime/javaCalls.hpp"
51 #include "runtime/mutexLocker.hpp"
52 #include "runtime/objectMonitor.hpp"
53 #include "runtime/orderAccess.inline.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/perfMemory.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "runtime/statSampler.hpp"
58 #include "runtime/stubRoutines.hpp"
59 #include "runtime/thread.inline.hpp"
60 #include "runtime/threadCritical.hpp"
61 #include "runtime/timer.hpp"
62 #include "runtime/vm_version.hpp"
63 #include "semaphore_posix.hpp"
64 #include "services/attachListener.hpp"
65 #include "services/memTracker.hpp"
66 #include "services/runtimeService.hpp"
67 #include "utilities/align.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/macros.hpp"
73 #include "utilities/vmError.hpp"
74
75 // put OS-includes here
76 # include <dlfcn.h>
77 # include <errno.h>
78 # include <exception>
79 # include <link.h>
80 # include <poll.h>
81 # include <pthread.h>
82 # include <schedctl.h>
83 # include <setjmp.h>
84 # include <signal.h>
85 # include <stdio.h>
86 # include <alloca.h>
87 # include <sys/filio.h>
88 # include <sys/ipc.h>
89 # include <sys/lwp.h>
90 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
91 # include <sys/mman.h>
92 # include <sys/processor.h>
93 # include <sys/procset.h>
94 # include <sys/pset.h>
95 # include <sys/resource.h>
96 # include <sys/shm.h>
97 # include <sys/socket.h>
98 # include <sys/stat.h>
99 # include <sys/systeminfo.h>
100 # include <sys/time.h>
101 # include <sys/times.h>
102 # include <sys/types.h>
103 # include <sys/wait.h>
104 # include <sys/utsname.h>
105 # include <thread.h>
106 # include <unistd.h>
107 # include <sys/priocntl.h>
108 # include <sys/rtpriocntl.h>
109 # include <sys/tspriocntl.h>
110 # include <sys/iapriocntl.h>
111 # include <sys/fxpriocntl.h>
112 # include <sys/loadavg.h>
113 # include <string.h>
114 # include <stdio.h>
115
116 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
117 # include <sys/procfs.h> // see comment in <sys/procfs.h>
118
119 #define MAX_PATH (2 * K)
120
121 // for timer info max values which include all bits
122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
123
124
125 // Here are some liblgrp types from sys/lgrp_user.h to be able to
126 // compile on older systems without this header file.
127
128 #ifndef MADV_ACCESS_LWP
129 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
130 #endif
131 #ifndef MADV_ACCESS_MANY
132 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
133 #endif
134
135 #ifndef LGRP_RSRC_CPU
136 #define LGRP_RSRC_CPU 0 /* CPU resources */
137 #endif
138 #ifndef LGRP_RSRC_MEM
139 #define LGRP_RSRC_MEM 1 /* memory resources */
140 #endif
141
142 // Values for ThreadPriorityPolicy == 1
143 int prio_policy1[CriticalPriority+1] = {
144 -99999, 0, 16, 32, 48, 64,
145 80, 96, 112, 124, 127, 127 };
146
147 // System parameters used internally
148 static clock_t clock_tics_per_sec = 100;
149
150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
151 static bool enabled_extended_FILE_stdio = false;
152
153 // For diagnostics to print a message once. see run_periodic_checks
154 static bool check_addr0_done = false;
155 static sigset_t check_signal_done;
156 static bool check_signals = true;
157
158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
160
161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
162
163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
164
165 // "default" initializers for missing libc APIs
166 extern "C" {
167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
169
170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
171 static int lwp_cond_destroy(cond_t *cv) { return 0; }
172 }
173
174 // "default" initializers for pthread-based synchronization
175 extern "C" {
176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
178 }
179
180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
181
182 static inline size_t adjust_stack_size(address base, size_t size) {
183 if ((ssize_t)size < 0) {
184 // 4759953: Compensate for ridiculous stack size.
185 size = max_intx;
186 }
187 if (size > (size_t)base) {
188 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
189 size = (size_t)base;
190 }
191 return size;
192 }
193
194 static inline stack_t get_stack_info() {
195 stack_t st;
196 int retval = thr_stksegment(&st);
197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
198 assert(retval == 0, "incorrect return value from thr_stksegment");
199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
201 return st;
202 }
203
204 address os::current_stack_base() {
205 int r = thr_main();
206 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
207 bool is_primordial_thread = r;
208
209 // Workaround 4352906, avoid calls to thr_stksegment by
210 // thr_main after the first one (it looks like we trash
211 // some data, causing the value for ss_sp to be incorrect).
212 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
213 stack_t st = get_stack_info();
214 if (is_primordial_thread) {
215 // cache initial value of stack base
216 os::Solaris::_main_stack_base = (address)st.ss_sp;
217 }
218 return (address)st.ss_sp;
219 } else {
220 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
221 return os::Solaris::_main_stack_base;
222 }
223 }
224
225 size_t os::current_stack_size() {
226 size_t size;
227
228 int r = thr_main();
229 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
230 if (!r) {
231 size = get_stack_info().ss_size;
232 } else {
233 struct rlimit limits;
234 getrlimit(RLIMIT_STACK, &limits);
235 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
236 }
237 // base may not be page aligned
238 address base = current_stack_base();
239 address bottom = align_up(base - size, os::vm_page_size());;
240 return (size_t)(base - bottom);
241 }
242
243 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
244 return localtime_r(clock, res);
245 }
246
247 void os::Solaris::try_enable_extended_io() {
248 typedef int (*enable_extended_FILE_stdio_t)(int, int);
249
250 if (!UseExtendedFileIO) {
251 return;
252 }
253
254 enable_extended_FILE_stdio_t enabler =
255 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
256 "enable_extended_FILE_stdio");
257 if (enabler) {
258 enabler(-1, -1);
259 }
260 }
261
262 static int _processors_online = 0;
263
264 jint os::Solaris::_os_thread_limit = 0;
265 volatile jint os::Solaris::_os_thread_count = 0;
266
267 julong os::available_memory() {
268 return Solaris::available_memory();
269 }
270
271 julong os::Solaris::available_memory() {
272 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
273 }
274
275 julong os::Solaris::_physical_memory = 0;
276
277 julong os::physical_memory() {
278 return Solaris::physical_memory();
279 }
280
281 static hrtime_t first_hrtime = 0;
282 static const hrtime_t hrtime_hz = 1000*1000*1000;
283 static volatile hrtime_t max_hrtime = 0;
284
285
286 void os::Solaris::initialize_system_info() {
287 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
288 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
289 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
290 (julong)sysconf(_SC_PAGESIZE);
291 }
292
293 int os::active_processor_count() {
294 // User has overridden the number of active processors
295 if (ActiveProcessorCount > 0) {
296 log_trace(os)("active_processor_count: "
297 "active processor count set by user : %d",
298 ActiveProcessorCount);
299 return ActiveProcessorCount;
300 }
301
302 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
303 pid_t pid = getpid();
304 psetid_t pset = PS_NONE;
305 // Are we running in a processor set or is there any processor set around?
306 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
307 uint_t pset_cpus;
308 // Query the number of cpus available to us.
309 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
310 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
311 _processors_online = pset_cpus;
312 return pset_cpus;
313 }
314 }
315 // Otherwise return number of online cpus
316 return online_cpus;
317 }
318
319 static bool find_processors_in_pset(psetid_t pset,
320 processorid_t** id_array,
321 uint_t* id_length) {
322 bool result = false;
323 // Find the number of processors in the processor set.
324 if (pset_info(pset, NULL, id_length, NULL) == 0) {
325 // Make up an array to hold their ids.
326 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
327 // Fill in the array with their processor ids.
328 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
329 result = true;
330 }
331 }
332 return result;
333 }
334
335 // Callers of find_processors_online() must tolerate imprecise results --
336 // the system configuration can change asynchronously because of DR
337 // or explicit psradm operations.
338 //
339 // We also need to take care that the loop (below) terminates as the
340 // number of processors online can change between the _SC_NPROCESSORS_ONLN
341 // request and the loop that builds the list of processor ids. Unfortunately
342 // there's no reliable way to determine the maximum valid processor id,
343 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
344 // man pages, which claim the processor id set is "sparse, but
345 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
346 // exit the loop.
347 //
348 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
349 // not available on S8.0.
350
351 static bool find_processors_online(processorid_t** id_array,
352 uint* id_length) {
353 const processorid_t MAX_PROCESSOR_ID = 100000;
354 // Find the number of processors online.
355 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
356 // Make up an array to hold their ids.
357 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
358 // Processors need not be numbered consecutively.
359 long found = 0;
360 processorid_t next = 0;
361 while (found < *id_length && next < MAX_PROCESSOR_ID) {
362 processor_info_t info;
363 if (processor_info(next, &info) == 0) {
364 // NB, PI_NOINTR processors are effectively online ...
365 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
366 (*id_array)[found] = next;
367 found += 1;
368 }
369 }
370 next += 1;
371 }
372 if (found < *id_length) {
373 // The loop above didn't identify the expected number of processors.
374 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
375 // and re-running the loop, above, but there's no guarantee of progress
376 // if the system configuration is in flux. Instead, we just return what
377 // we've got. Note that in the worst case find_processors_online() could
378 // return an empty set. (As a fall-back in the case of the empty set we
379 // could just return the ID of the current processor).
380 *id_length = found;
381 }
382
383 return true;
384 }
385
386 static bool assign_distribution(processorid_t* id_array,
387 uint id_length,
388 uint* distribution,
389 uint distribution_length) {
390 // We assume we can assign processorid_t's to uint's.
391 assert(sizeof(processorid_t) == sizeof(uint),
392 "can't convert processorid_t to uint");
393 // Quick check to see if we won't succeed.
394 if (id_length < distribution_length) {
395 return false;
396 }
397 // Assign processor ids to the distribution.
398 // Try to shuffle processors to distribute work across boards,
399 // assuming 4 processors per board.
400 const uint processors_per_board = ProcessDistributionStride;
401 // Find the maximum processor id.
402 processorid_t max_id = 0;
403 for (uint m = 0; m < id_length; m += 1) {
404 max_id = MAX2(max_id, id_array[m]);
405 }
406 // The next id, to limit loops.
407 const processorid_t limit_id = max_id + 1;
408 // Make up markers for available processors.
409 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
410 for (uint c = 0; c < limit_id; c += 1) {
411 available_id[c] = false;
412 }
413 for (uint a = 0; a < id_length; a += 1) {
414 available_id[id_array[a]] = true;
415 }
416 // Step by "boards", then by "slot", copying to "assigned".
417 // NEEDS_CLEANUP: The assignment of processors should be stateful,
418 // remembering which processors have been assigned by
419 // previous calls, etc., so as to distribute several
420 // independent calls of this method. What we'd like is
421 // It would be nice to have an API that let us ask
422 // how many processes are bound to a processor,
423 // but we don't have that, either.
424 // In the short term, "board" is static so that
425 // subsequent distributions don't all start at board 0.
426 static uint board = 0;
427 uint assigned = 0;
428 // Until we've found enough processors ....
429 while (assigned < distribution_length) {
430 // ... find the next available processor in the board.
431 for (uint slot = 0; slot < processors_per_board; slot += 1) {
432 uint try_id = board * processors_per_board + slot;
433 if ((try_id < limit_id) && (available_id[try_id] == true)) {
434 distribution[assigned] = try_id;
435 available_id[try_id] = false;
436 assigned += 1;
437 break;
438 }
439 }
440 board += 1;
441 if (board * processors_per_board + 0 >= limit_id) {
442 board = 0;
443 }
444 }
445 if (available_id != NULL) {
446 FREE_C_HEAP_ARRAY(bool, available_id);
447 }
448 return true;
449 }
450
451 void os::set_native_thread_name(const char *name) {
452 if (Solaris::_pthread_setname_np != NULL) {
453 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
454 // but we explicitly copy into a size-limited buffer to avoid any
455 // possible overflow.
456 char buf[32];
457 snprintf(buf, sizeof(buf), "%s", name);
458 buf[sizeof(buf) - 1] = '\0';
459 Solaris::_pthread_setname_np(pthread_self(), buf);
460 }
461 }
462
463 bool os::distribute_processes(uint length, uint* distribution) {
464 bool result = false;
465 // Find the processor id's of all the available CPUs.
466 processorid_t* id_array = NULL;
467 uint id_length = 0;
468 // There are some races between querying information and using it,
469 // since processor sets can change dynamically.
470 psetid_t pset = PS_NONE;
471 // Are we running in a processor set?
472 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
473 result = find_processors_in_pset(pset, &id_array, &id_length);
474 } else {
475 result = find_processors_online(&id_array, &id_length);
476 }
477 if (result == true) {
478 if (id_length >= length) {
479 result = assign_distribution(id_array, id_length, distribution, length);
480 } else {
481 result = false;
482 }
483 }
484 if (id_array != NULL) {
485 FREE_C_HEAP_ARRAY(processorid_t, id_array);
486 }
487 return result;
488 }
489
490 bool os::bind_to_processor(uint processor_id) {
491 // We assume that a processorid_t can be stored in a uint.
492 assert(sizeof(uint) == sizeof(processorid_t),
493 "can't convert uint to processorid_t");
494 int bind_result =
495 processor_bind(P_LWPID, // bind LWP.
496 P_MYID, // bind current LWP.
497 (processorid_t) processor_id, // id.
498 NULL); // don't return old binding.
499 return (bind_result == 0);
500 }
501
502 // Return true if user is running as root.
503
504 bool os::have_special_privileges() {
505 static bool init = false;
506 static bool privileges = false;
507 if (!init) {
508 privileges = (getuid() != geteuid()) || (getgid() != getegid());
509 init = true;
510 }
511 return privileges;
512 }
513
514
515 void os::init_system_properties_values() {
516 // The next steps are taken in the product version:
517 //
518 // Obtain the JAVA_HOME value from the location of libjvm.so.
519 // This library should be located at:
520 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
521 //
522 // If "/jre/lib/" appears at the right place in the path, then we
523 // assume libjvm.so is installed in a JDK and we use this path.
524 //
525 // Otherwise exit with message: "Could not create the Java virtual machine."
526 //
527 // The following extra steps are taken in the debugging version:
528 //
529 // If "/jre/lib/" does NOT appear at the right place in the path
530 // instead of exit check for $JAVA_HOME environment variable.
531 //
532 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
533 // then we append a fake suffix "hotspot/libjvm.so" to this path so
534 // it looks like libjvm.so is installed there
535 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
536 //
537 // Otherwise exit.
538 //
539 // Important note: if the location of libjvm.so changes this
540 // code needs to be changed accordingly.
541
542 // Base path of extensions installed on the system.
543 #define SYS_EXT_DIR "/usr/jdk/packages"
544 #define EXTENSIONS_DIR "/lib/ext"
545
546 // Buffer that fits several sprintfs.
547 // Note that the space for the colon and the trailing null are provided
548 // by the nulls included by the sizeof operator.
549 const size_t bufsize =
550 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
551 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
552 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
553 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
554
555 // sysclasspath, java_home, dll_dir
556 {
557 char *pslash;
558 os::jvm_path(buf, bufsize);
559
560 // Found the full path to libjvm.so.
561 // Now cut the path to <java_home>/jre if we can.
562 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
563 pslash = strrchr(buf, '/');
564 if (pslash != NULL) {
565 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
566 }
567 Arguments::set_dll_dir(buf);
568
569 if (pslash != NULL) {
570 pslash = strrchr(buf, '/');
571 if (pslash != NULL) {
572 *pslash = '\0'; // Get rid of /lib.
573 }
574 }
575 Arguments::set_java_home(buf);
576 set_boot_path('/', ':');
577 }
578
579 // Where to look for native libraries.
580 {
581 // Use dlinfo() to determine the correct java.library.path.
582 //
583 // If we're launched by the Java launcher, and the user
584 // does not set java.library.path explicitly on the commandline,
585 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
586 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
587 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
588 // /usr/lib), which is exactly what we want.
589 //
590 // If the user does set java.library.path, it completely
591 // overwrites this setting, and always has.
592 //
593 // If we're not launched by the Java launcher, we may
594 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
595 // settings. Again, dlinfo does exactly what we want.
596
597 Dl_serinfo info_sz, *info = &info_sz;
598 Dl_serpath *path;
599 char *library_path;
600 char *common_path = buf;
601
602 // Determine search path count and required buffer size.
603 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
604 FREE_C_HEAP_ARRAY(char, buf);
605 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
606 }
607
608 // Allocate new buffer and initialize.
609 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
610 info->dls_size = info_sz.dls_size;
611 info->dls_cnt = info_sz.dls_cnt;
612
613 // Obtain search path information.
614 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
615 FREE_C_HEAP_ARRAY(char, buf);
616 FREE_C_HEAP_ARRAY(char, info);
617 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
618 }
619
620 path = &info->dls_serpath[0];
621
622 // Note: Due to a legacy implementation, most of the library path
623 // is set in the launcher. This was to accomodate linking restrictions
624 // on legacy Solaris implementations (which are no longer supported).
625 // Eventually, all the library path setting will be done here.
626 //
627 // However, to prevent the proliferation of improperly built native
628 // libraries, the new path component /usr/jdk/packages is added here.
629
630 // Construct the invariant part of ld_library_path.
631 sprintf(common_path, SYS_EXT_DIR "/lib");
632
633 // Struct size is more than sufficient for the path components obtained
634 // through the dlinfo() call, so only add additional space for the path
635 // components explicitly added here.
636 size_t library_path_size = info->dls_size + strlen(common_path);
637 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
638 library_path[0] = '\0';
639
640 // Construct the desired Java library path from the linker's library
641 // search path.
642 //
643 // For compatibility, it is optimal that we insert the additional path
644 // components specific to the Java VM after those components specified
645 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
646 // infrastructure.
647 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
648 strcpy(library_path, common_path);
649 } else {
650 int inserted = 0;
651 int i;
652 for (i = 0; i < info->dls_cnt; i++, path++) {
653 uint_t flags = path->dls_flags & LA_SER_MASK;
654 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
655 strcat(library_path, common_path);
656 strcat(library_path, os::path_separator());
657 inserted = 1;
658 }
659 strcat(library_path, path->dls_name);
660 strcat(library_path, os::path_separator());
661 }
662 // Eliminate trailing path separator.
663 library_path[strlen(library_path)-1] = '\0';
664 }
665
666 // happens before argument parsing - can't use a trace flag
667 // tty->print_raw("init_system_properties_values: native lib path: ");
668 // tty->print_raw_cr(library_path);
669
670 // Callee copies into its own buffer.
671 Arguments::set_library_path(library_path);
672
673 FREE_C_HEAP_ARRAY(char, library_path);
674 FREE_C_HEAP_ARRAY(char, info);
675 }
676
677 // Extensions directories.
678 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
679 Arguments::set_ext_dirs(buf);
680
681 FREE_C_HEAP_ARRAY(char, buf);
682
683 #undef SYS_EXT_DIR
684 #undef EXTENSIONS_DIR
685 }
686
687 void os::breakpoint() {
688 BREAKPOINT;
689 }
690
691 bool os::obsolete_option(const JavaVMOption *option) {
692 if (!strncmp(option->optionString, "-Xt", 3)) {
693 return true;
694 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
695 return true;
696 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
697 return true;
698 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
699 return true;
700 }
701 return false;
702 }
703
704 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
705 address stackStart = (address)thread->stack_base();
706 address stackEnd = (address)(stackStart - (address)thread->stack_size());
707 if (sp < stackStart && sp >= stackEnd) return true;
708 return false;
709 }
710
711 extern "C" void breakpoint() {
712 // use debugger to set breakpoint here
713 }
714
715 static thread_t main_thread;
716
717 // Thread start routine for all newly created threads
718 extern "C" void* thread_native_entry(void* thread_addr) {
719 // Try to randomize the cache line index of hot stack frames.
720 // This helps when threads of the same stack traces evict each other's
721 // cache lines. The threads can be either from the same JVM instance, or
722 // from different JVM instances. The benefit is especially true for
723 // processors with hyperthreading technology.
724 static int counter = 0;
725 int pid = os::current_process_id();
726 alloca(((pid ^ counter++) & 7) * 128);
727
728 int prio;
729 Thread* thread = (Thread*)thread_addr;
730
731 thread->initialize_thread_current();
732
733 OSThread* osthr = thread->osthread();
734
735 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
736 thread->_schedctl = (void *) schedctl_init();
737
738 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
739 os::current_thread_id());
740
741 if (UseNUMA) {
742 int lgrp_id = os::numa_get_group_id();
743 if (lgrp_id != -1) {
744 thread->set_lgrp_id(lgrp_id);
745 }
746 }
747
748 // Our priority was set when we were created, and stored in the
749 // osthread, but couldn't be passed through to our LWP until now.
750 // So read back the priority and set it again.
751
752 if (osthr->thread_id() != -1) {
753 if (UseThreadPriorities) {
754 int prio = osthr->native_priority();
755 if (ThreadPriorityVerbose) {
756 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
757 INTPTR_FORMAT ", setting priority: %d\n",
758 osthr->thread_id(), osthr->lwp_id(), prio);
759 }
760 os::set_native_priority(thread, prio);
761 }
762 } else if (ThreadPriorityVerbose) {
763 warning("Can't set priority in _start routine, thread id hasn't been set\n");
764 }
765
766 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
767
768 // initialize signal mask for this thread
769 os::Solaris::hotspot_sigmask(thread);
770
771 thread->run();
772
773 // One less thread is executing
774 // When the VMThread gets here, the main thread may have already exited
775 // which frees the CodeHeap containing the Atomic::dec code
776 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
777 Atomic::dec(&os::Solaris::_os_thread_count);
778 }
779
780 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
781
782 // If a thread has not deleted itself ("delete this") as part of its
783 // termination sequence, we have to ensure thread-local-storage is
784 // cleared before we actually terminate. No threads should ever be
785 // deleted asynchronously with respect to their termination.
786 if (Thread::current_or_null_safe() != NULL) {
787 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
788 thread->clear_thread_current();
789 }
790
791 if (UseDetachedThreads) {
792 thr_exit(NULL);
793 ShouldNotReachHere();
794 }
795 return NULL;
796 }
797
798 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
799 // Allocate the OSThread object
800 OSThread* osthread = new OSThread(NULL, NULL);
801 if (osthread == NULL) return NULL;
802
803 // Store info on the Solaris thread into the OSThread
804 osthread->set_thread_id(thread_id);
805 osthread->set_lwp_id(_lwp_self());
806 thread->_schedctl = (void *) schedctl_init();
807
808 if (UseNUMA) {
809 int lgrp_id = os::numa_get_group_id();
810 if (lgrp_id != -1) {
811 thread->set_lgrp_id(lgrp_id);
812 }
813 }
814
815 if (ThreadPriorityVerbose) {
816 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
817 osthread->thread_id(), osthread->lwp_id());
818 }
819
820 // Initial thread state is INITIALIZED, not SUSPENDED
821 osthread->set_state(INITIALIZED);
822
823 return osthread;
824 }
825
826 void os::Solaris::hotspot_sigmask(Thread* thread) {
827 //Save caller's signal mask
828 sigset_t sigmask;
829 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
830 OSThread *osthread = thread->osthread();
831 osthread->set_caller_sigmask(sigmask);
832
833 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
834 if (!ReduceSignalUsage) {
835 if (thread->is_VM_thread()) {
836 // Only the VM thread handles BREAK_SIGNAL ...
837 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
838 } else {
839 // ... all other threads block BREAK_SIGNAL
840 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
841 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
842 }
843 }
844 }
845
846 bool os::create_attached_thread(JavaThread* thread) {
847 #ifdef ASSERT
848 thread->verify_not_published();
849 #endif
850 OSThread* osthread = create_os_thread(thread, thr_self());
851 if (osthread == NULL) {
852 return false;
853 }
854
855 // Initial thread state is RUNNABLE
856 osthread->set_state(RUNNABLE);
857 thread->set_osthread(osthread);
858
859 // initialize signal mask for this thread
860 // and save the caller's signal mask
861 os::Solaris::hotspot_sigmask(thread);
862
863 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
864 os::current_thread_id());
865
866 return true;
867 }
868
869 bool os::create_main_thread(JavaThread* thread) {
870 #ifdef ASSERT
871 thread->verify_not_published();
872 #endif
873 if (_starting_thread == NULL) {
874 _starting_thread = create_os_thread(thread, main_thread);
875 if (_starting_thread == NULL) {
876 return false;
877 }
878 }
879
880 // The primodial thread is runnable from the start
881 _starting_thread->set_state(RUNNABLE);
882
883 thread->set_osthread(_starting_thread);
884
885 // initialize signal mask for this thread
886 // and save the caller's signal mask
887 os::Solaris::hotspot_sigmask(thread);
888
889 return true;
890 }
891
892 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
893 static char* describe_thr_create_attributes(char* buf, size_t buflen,
894 size_t stacksize, long flags) {
895 stringStream ss(buf, buflen);
896 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
897 ss.print("flags: ");
898 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
899 #define ALL(X) \
900 X(THR_SUSPENDED) \
901 X(THR_DETACHED) \
902 X(THR_BOUND) \
903 X(THR_NEW_LWP) \
904 X(THR_DAEMON)
905 ALL(PRINT_FLAG)
906 #undef ALL
907 #undef PRINT_FLAG
908 return buf;
909 }
910
911 // return default stack size for thr_type
912 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
913 // default stack size when not specified by caller is 1M (2M for LP64)
914 size_t s = (BytesPerWord >> 2) * K * K;
915 return s;
916 }
917
918 bool os::create_thread(Thread* thread, ThreadType thr_type,
919 size_t req_stack_size) {
920 // Allocate the OSThread object
921 OSThread* osthread = new OSThread(NULL, NULL);
922 if (osthread == NULL) {
923 return false;
924 }
925
926 if (ThreadPriorityVerbose) {
927 char *thrtyp;
928 switch (thr_type) {
929 case vm_thread:
930 thrtyp = (char *)"vm";
931 break;
932 case cgc_thread:
933 thrtyp = (char *)"cgc";
934 break;
935 case pgc_thread:
936 thrtyp = (char *)"pgc";
937 break;
938 case java_thread:
939 thrtyp = (char *)"java";
940 break;
941 case compiler_thread:
942 thrtyp = (char *)"compiler";
943 break;
944 case watcher_thread:
945 thrtyp = (char *)"watcher";
946 break;
947 default:
948 thrtyp = (char *)"unknown";
949 break;
950 }
951 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
952 }
953
954 // calculate stack size if it's not specified by caller
955 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
956
957 // Initial state is ALLOCATED but not INITIALIZED
958 osthread->set_state(ALLOCATED);
959
960 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
961 // We got lots of threads. Check if we still have some address space left.
962 // Need to be at least 5Mb of unreserved address space. We do check by
963 // trying to reserve some.
964 const size_t VirtualMemoryBangSize = 20*K*K;
965 char* mem = os::reserve_memory(VirtualMemoryBangSize);
966 if (mem == NULL) {
967 delete osthread;
968 return false;
969 } else {
970 // Release the memory again
971 os::release_memory(mem, VirtualMemoryBangSize);
972 }
973 }
974
975 // Setup osthread because the child thread may need it.
976 thread->set_osthread(osthread);
977
978 // Create the Solaris thread
979 thread_t tid = 0;
980 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
981 int status;
982
983 // Mark that we don't have an lwp or thread id yet.
984 // In case we attempt to set the priority before the thread starts.
985 osthread->set_lwp_id(-1);
986 osthread->set_thread_id(-1);
987
988 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
989
990 char buf[64];
991 if (status == 0) {
992 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
993 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
994 } else {
995 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
996 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
997 }
998
999 if (status != 0) {
1000 thread->set_osthread(NULL);
1001 // Need to clean up stuff we've allocated so far
1002 delete osthread;
1003 return false;
1004 }
1005
1006 Atomic::inc(&os::Solaris::_os_thread_count);
1007
1008 // Store info on the Solaris thread into the OSThread
1009 osthread->set_thread_id(tid);
1010
1011 // Remember that we created this thread so we can set priority on it
1012 osthread->set_vm_created();
1013
1014 // Most thread types will set an explicit priority before starting the thread,
1015 // but for those that don't we need a valid value to read back in thread_native_entry.
1016 osthread->set_native_priority(NormPriority);
1017
1018 // Initial thread state is INITIALIZED, not SUSPENDED
1019 osthread->set_state(INITIALIZED);
1020
1021 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1022 return true;
1023 }
1024
1025 debug_only(static bool signal_sets_initialized = false);
1026 static sigset_t unblocked_sigs, vm_sigs;
1027
1028 bool os::Solaris::is_sig_ignored(int sig) {
1029 struct sigaction oact;
1030 sigaction(sig, (struct sigaction*)NULL, &oact);
1031 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1032 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1033 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1034 return true;
1035 } else {
1036 return false;
1037 }
1038 }
1039
1040 void os::Solaris::signal_sets_init() {
1041 // Should also have an assertion stating we are still single-threaded.
1042 assert(!signal_sets_initialized, "Already initialized");
1043 // Fill in signals that are necessarily unblocked for all threads in
1044 // the VM. Currently, we unblock the following signals:
1045 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1046 // by -Xrs (=ReduceSignalUsage));
1047 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1048 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1049 // the dispositions or masks wrt these signals.
1050 // Programs embedding the VM that want to use the above signals for their
1051 // own purposes must, at this time, use the "-Xrs" option to prevent
1052 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1053 // (See bug 4345157, and other related bugs).
1054 // In reality, though, unblocking these signals is really a nop, since
1055 // these signals are not blocked by default.
1056 sigemptyset(&unblocked_sigs);
1057 sigaddset(&unblocked_sigs, SIGILL);
1058 sigaddset(&unblocked_sigs, SIGSEGV);
1059 sigaddset(&unblocked_sigs, SIGBUS);
1060 sigaddset(&unblocked_sigs, SIGFPE);
1061 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1062
1063 if (!ReduceSignalUsage) {
1064 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1065 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1066 }
1067 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1068 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1069 }
1070 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1071 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1072 }
1073 }
1074 // Fill in signals that are blocked by all but the VM thread.
1075 sigemptyset(&vm_sigs);
1076 if (!ReduceSignalUsage) {
1077 sigaddset(&vm_sigs, BREAK_SIGNAL);
1078 }
1079 debug_only(signal_sets_initialized = true);
1080
1081 // For diagnostics only used in run_periodic_checks
1082 sigemptyset(&check_signal_done);
1083 }
1084
1085 // These are signals that are unblocked while a thread is running Java.
1086 // (For some reason, they get blocked by default.)
1087 sigset_t* os::Solaris::unblocked_signals() {
1088 assert(signal_sets_initialized, "Not initialized");
1089 return &unblocked_sigs;
1090 }
1091
1092 // These are the signals that are blocked while a (non-VM) thread is
1093 // running Java. Only the VM thread handles these signals.
1094 sigset_t* os::Solaris::vm_signals() {
1095 assert(signal_sets_initialized, "Not initialized");
1096 return &vm_sigs;
1097 }
1098
1099 void _handle_uncaught_cxx_exception() {
1100 VMError::report_and_die("An uncaught C++ exception");
1101 }
1102
1103
1104 // First crack at OS-specific initialization, from inside the new thread.
1105 void os::initialize_thread(Thread* thr) {
1106 int r = thr_main();
1107 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1108 if (r) {
1109 JavaThread* jt = (JavaThread *)thr;
1110 assert(jt != NULL, "Sanity check");
1111 size_t stack_size;
1112 address base = jt->stack_base();
1113 if (Arguments::created_by_java_launcher()) {
1114 // Use 2MB to allow for Solaris 7 64 bit mode.
1115 stack_size = JavaThread::stack_size_at_create() == 0
1116 ? 2048*K : JavaThread::stack_size_at_create();
1117
1118 // There are rare cases when we may have already used more than
1119 // the basic stack size allotment before this method is invoked.
1120 // Attempt to allow for a normally sized java_stack.
1121 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1122 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1123 } else {
1124 // 6269555: If we were not created by a Java launcher, i.e. if we are
1125 // running embedded in a native application, treat the primordial thread
1126 // as much like a native attached thread as possible. This means using
1127 // the current stack size from thr_stksegment(), unless it is too large
1128 // to reliably setup guard pages. A reasonable max size is 8MB.
1129 size_t current_size = current_stack_size();
1130 // This should never happen, but just in case....
1131 if (current_size == 0) current_size = 2 * K * K;
1132 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1133 }
1134 address bottom = align_up(base - stack_size, os::vm_page_size());;
1135 stack_size = (size_t)(base - bottom);
1136
1137 assert(stack_size > 0, "Stack size calculation problem");
1138
1139 if (stack_size > jt->stack_size()) {
1140 #ifndef PRODUCT
1141 struct rlimit limits;
1142 getrlimit(RLIMIT_STACK, &limits);
1143 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1144 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1145 #endif
1146 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1147 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1148 "See limit(1) to increase the stack size limit.",
1149 stack_size / K, jt->stack_size() / K);
1150 vm_exit(1);
1151 }
1152 assert(jt->stack_size() >= stack_size,
1153 "Attempt to map more stack than was allocated");
1154 jt->set_stack_size(stack_size);
1155 }
1156
1157 // With the T2 libthread (T1 is no longer supported) threads are always bound
1158 // and we use stackbanging in all cases.
1159
1160 os::Solaris::init_thread_fpu_state();
1161 std::set_terminate(_handle_uncaught_cxx_exception);
1162 }
1163
1164
1165
1166 // Free Solaris resources related to the OSThread
1167 void os::free_thread(OSThread* osthread) {
1168 assert(osthread != NULL, "os::free_thread but osthread not set");
1169
1170 // We are told to free resources of the argument thread,
1171 // but we can only really operate on the current thread.
1172 assert(Thread::current()->osthread() == osthread,
1173 "os::free_thread but not current thread");
1174
1175 // Restore caller's signal mask
1176 sigset_t sigmask = osthread->caller_sigmask();
1177 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1178
1179 delete osthread;
1180 }
1181
1182 void os::pd_start_thread(Thread* thread) {
1183 int status = thr_continue(thread->osthread()->thread_id());
1184 assert_status(status == 0, status, "thr_continue failed");
1185 }
1186
1187
1188 intx os::current_thread_id() {
1189 return (intx)thr_self();
1190 }
1191
1192 static pid_t _initial_pid = 0;
1193
1194 int os::current_process_id() {
1195 return (int)(_initial_pid ? _initial_pid : getpid());
1196 }
1197
1198 // gethrtime() should be monotonic according to the documentation,
1199 // but some virtualized platforms are known to break this guarantee.
1200 // getTimeNanos() must be guaranteed not to move backwards, so we
1201 // are forced to add a check here.
1202 inline hrtime_t getTimeNanos() {
1203 const hrtime_t now = gethrtime();
1204 const hrtime_t prev = max_hrtime;
1205 if (now <= prev) {
1206 return prev; // same or retrograde time;
1207 }
1208 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev);
1209 assert(obsv >= prev, "invariant"); // Monotonicity
1210 // If the CAS succeeded then we're done and return "now".
1211 // If the CAS failed and the observed value "obsv" is >= now then
1212 // we should return "obsv". If the CAS failed and now > obsv > prv then
1213 // some other thread raced this thread and installed a new value, in which case
1214 // we could either (a) retry the entire operation, (b) retry trying to install now
1215 // or (c) just return obsv. We use (c). No loop is required although in some cases
1216 // we might discard a higher "now" value in deference to a slightly lower but freshly
1217 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1218 // to (a) or (b) -- and greatly reduces coherence traffic.
1219 // We might also condition (c) on the magnitude of the delta between obsv and now.
1220 // Avoiding excessive CAS operations to hot RW locations is critical.
1221 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1222 return (prev == obsv) ? now : obsv;
1223 }
1224
1225 // Time since start-up in seconds to a fine granularity.
1226 // Used by VMSelfDestructTimer and the MemProfiler.
1227 double os::elapsedTime() {
1228 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1229 }
1230
1231 jlong os::elapsed_counter() {
1232 return (jlong)(getTimeNanos() - first_hrtime);
1233 }
1234
1235 jlong os::elapsed_frequency() {
1236 return hrtime_hz;
1237 }
1238
1239 // Return the real, user, and system times in seconds from an
1240 // arbitrary fixed point in the past.
1241 bool os::getTimesSecs(double* process_real_time,
1242 double* process_user_time,
1243 double* process_system_time) {
1244 struct tms ticks;
1245 clock_t real_ticks = times(&ticks);
1246
1247 if (real_ticks == (clock_t) (-1)) {
1248 return false;
1249 } else {
1250 double ticks_per_second = (double) clock_tics_per_sec;
1251 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1252 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1253 // For consistency return the real time from getTimeNanos()
1254 // converted to seconds.
1255 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1256
1257 return true;
1258 }
1259 }
1260
1261 bool os::supports_vtime() { return true; }
1262 bool os::enable_vtime() { return false; }
1263 bool os::vtime_enabled() { return false; }
1264
1265 double os::elapsedVTime() {
1266 return (double)gethrvtime() / (double)hrtime_hz;
1267 }
1268
1269 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1270 jlong os::javaTimeMillis() {
1271 timeval t;
1272 if (gettimeofday(&t, NULL) == -1) {
1273 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1274 }
1275 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1276 }
1277
1278 // Must return seconds+nanos since Jan 1 1970. This must use the same
1279 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1280 // we need better than 1ms accuracy
1281 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1282 timeval t;
1283 if (gettimeofday(&t, NULL) == -1) {
1284 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1285 }
1286 seconds = jlong(t.tv_sec);
1287 nanos = jlong(t.tv_usec) * 1000;
1288 }
1289
1290
1291 jlong os::javaTimeNanos() {
1292 return (jlong)getTimeNanos();
1293 }
1294
1295 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1296 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1297 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1298 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1299 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1300 }
1301
1302 char * os::local_time_string(char *buf, size_t buflen) {
1303 struct tm t;
1304 time_t long_time;
1305 time(&long_time);
1306 localtime_r(&long_time, &t);
1307 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1308 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1309 t.tm_hour, t.tm_min, t.tm_sec);
1310 return buf;
1311 }
1312
1313 // Note: os::shutdown() might be called very early during initialization, or
1314 // called from signal handler. Before adding something to os::shutdown(), make
1315 // sure it is async-safe and can handle partially initialized VM.
1316 void os::shutdown() {
1317
1318 // allow PerfMemory to attempt cleanup of any persistent resources
1319 perfMemory_exit();
1320
1321 // needs to remove object in file system
1322 AttachListener::abort();
1323
1324 // flush buffered output, finish log files
1325 ostream_abort();
1326
1327 // Check for abort hook
1328 abort_hook_t abort_hook = Arguments::abort_hook();
1329 if (abort_hook != NULL) {
1330 abort_hook();
1331 }
1332 }
1333
1334 // Note: os::abort() might be called very early during initialization, or
1335 // called from signal handler. Before adding something to os::abort(), make
1336 // sure it is async-safe and can handle partially initialized VM.
1337 void os::abort(bool dump_core, void* siginfo, const void* context) {
1338 os::shutdown();
1339 if (dump_core) {
1340 #ifndef PRODUCT
1341 fdStream out(defaultStream::output_fd());
1342 out.print_raw("Current thread is ");
1343 char buf[16];
1344 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1345 out.print_raw_cr(buf);
1346 out.print_raw_cr("Dumping core ...");
1347 #endif
1348 ::abort(); // dump core (for debugging)
1349 }
1350
1351 ::exit(1);
1352 }
1353
1354 // Die immediately, no exit hook, no abort hook, no cleanup.
1355 void os::die() {
1356 ::abort(); // dump core (for debugging)
1357 }
1358
1359 // DLL functions
1360
1361 const char* os::dll_file_extension() { return ".so"; }
1362
1363 // This must be hard coded because it's the system's temporary
1364 // directory not the java application's temp directory, ala java.io.tmpdir.
1365 const char* os::get_temp_directory() { return "/tmp"; }
1366
1367 // check if addr is inside libjvm.so
1368 bool os::address_is_in_vm(address addr) {
1369 static address libjvm_base_addr;
1370 Dl_info dlinfo;
1371
1372 if (libjvm_base_addr == NULL) {
1373 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1374 libjvm_base_addr = (address)dlinfo.dli_fbase;
1375 }
1376 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1377 }
1378
1379 if (dladdr((void *)addr, &dlinfo) != 0) {
1380 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1381 }
1382
1383 return false;
1384 }
1385
1386 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1387 static dladdr1_func_type dladdr1_func = NULL;
1388
1389 bool os::dll_address_to_function_name(address addr, char *buf,
1390 int buflen, int * offset,
1391 bool demangle) {
1392 // buf is not optional, but offset is optional
1393 assert(buf != NULL, "sanity check");
1394
1395 Dl_info dlinfo;
1396
1397 // dladdr1_func was initialized in os::init()
1398 if (dladdr1_func != NULL) {
1399 // yes, we have dladdr1
1400
1401 // Support for dladdr1 is checked at runtime; it may be
1402 // available even if the vm is built on a machine that does
1403 // not have dladdr1 support. Make sure there is a value for
1404 // RTLD_DL_SYMENT.
1405 #ifndef RTLD_DL_SYMENT
1406 #define RTLD_DL_SYMENT 1
1407 #endif
1408 #ifdef _LP64
1409 Elf64_Sym * info;
1410 #else
1411 Elf32_Sym * info;
1412 #endif
1413 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1414 RTLD_DL_SYMENT) != 0) {
1415 // see if we have a matching symbol that covers our address
1416 if (dlinfo.dli_saddr != NULL &&
1417 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1418 if (dlinfo.dli_sname != NULL) {
1419 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1420 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1421 }
1422 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1423 return true;
1424 }
1425 }
1426 // no matching symbol so try for just file info
1427 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1428 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1429 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1430 return true;
1431 }
1432 }
1433 }
1434 buf[0] = '\0';
1435 if (offset != NULL) *offset = -1;
1436 return false;
1437 }
1438
1439 // no, only dladdr is available
1440 if (dladdr((void *)addr, &dlinfo) != 0) {
1441 // see if we have a matching symbol
1442 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1443 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1444 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1445 }
1446 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1447 return true;
1448 }
1449 // no matching symbol so try for just file info
1450 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1451 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1452 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1453 return true;
1454 }
1455 }
1456 }
1457 buf[0] = '\0';
1458 if (offset != NULL) *offset = -1;
1459 return false;
1460 }
1461
1462 bool os::dll_address_to_library_name(address addr, char* buf,
1463 int buflen, int* offset) {
1464 // buf is not optional, but offset is optional
1465 assert(buf != NULL, "sanity check");
1466
1467 Dl_info dlinfo;
1468
1469 if (dladdr((void*)addr, &dlinfo) != 0) {
1470 if (dlinfo.dli_fname != NULL) {
1471 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1472 }
1473 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1474 *offset = addr - (address)dlinfo.dli_fbase;
1475 }
1476 return true;
1477 }
1478
1479 buf[0] = '\0';
1480 if (offset) *offset = -1;
1481 return false;
1482 }
1483
1484 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1485 Dl_info dli;
1486 // Sanity check?
1487 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1488 dli.dli_fname == NULL) {
1489 return 1;
1490 }
1491
1492 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1493 if (handle == NULL) {
1494 return 1;
1495 }
1496
1497 Link_map *map;
1498 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1499 if (map == NULL) {
1500 dlclose(handle);
1501 return 1;
1502 }
1503
1504 while (map->l_prev != NULL) {
1505 map = map->l_prev;
1506 }
1507
1508 while (map != NULL) {
1509 // Iterate through all map entries and call callback with fields of interest
1510 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1511 dlclose(handle);
1512 return 1;
1513 }
1514 map = map->l_next;
1515 }
1516
1517 dlclose(handle);
1518 return 0;
1519 }
1520
1521 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1522 outputStream * out = (outputStream *) param;
1523 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1524 return 0;
1525 }
1526
1527 void os::print_dll_info(outputStream * st) {
1528 st->print_cr("Dynamic libraries:"); st->flush();
1529 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1530 st->print_cr("Error: Cannot print dynamic libraries.");
1531 }
1532 }
1533
1534 // Loads .dll/.so and
1535 // in case of error it checks if .dll/.so was built for the
1536 // same architecture as Hotspot is running on
1537
1538 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1539 void * result= ::dlopen(filename, RTLD_LAZY);
1540 if (result != NULL) {
1541 // Successful loading
1542 return result;
1543 }
1544
1545 Elf32_Ehdr elf_head;
1546
1547 // Read system error message into ebuf
1548 // It may or may not be overwritten below
1549 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1550 ebuf[ebuflen-1]='\0';
1551 int diag_msg_max_length=ebuflen-strlen(ebuf);
1552 char* diag_msg_buf=ebuf+strlen(ebuf);
1553
1554 if (diag_msg_max_length==0) {
1555 // No more space in ebuf for additional diagnostics message
1556 return NULL;
1557 }
1558
1559
1560 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1561
1562 if (file_descriptor < 0) {
1563 // Can't open library, report dlerror() message
1564 return NULL;
1565 }
1566
1567 bool failed_to_read_elf_head=
1568 (sizeof(elf_head)!=
1569 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1570
1571 ::close(file_descriptor);
1572 if (failed_to_read_elf_head) {
1573 // file i/o error - report dlerror() msg
1574 return NULL;
1575 }
1576
1577 typedef struct {
1578 Elf32_Half code; // Actual value as defined in elf.h
1579 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1580 char elf_class; // 32 or 64 bit
1581 char endianess; // MSB or LSB
1582 char* name; // String representation
1583 } arch_t;
1584
1585 static const arch_t arch_array[]={
1586 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1587 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1588 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1589 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1590 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1591 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1592 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1593 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1594 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1595 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1596 };
1597
1598 #if (defined IA32)
1599 static Elf32_Half running_arch_code=EM_386;
1600 #elif (defined AMD64)
1601 static Elf32_Half running_arch_code=EM_X86_64;
1602 #elif (defined IA64)
1603 static Elf32_Half running_arch_code=EM_IA_64;
1604 #elif (defined __sparc) && (defined _LP64)
1605 static Elf32_Half running_arch_code=EM_SPARCV9;
1606 #elif (defined __sparc) && (!defined _LP64)
1607 static Elf32_Half running_arch_code=EM_SPARC;
1608 #elif (defined __powerpc64__)
1609 static Elf32_Half running_arch_code=EM_PPC64;
1610 #elif (defined __powerpc__)
1611 static Elf32_Half running_arch_code=EM_PPC;
1612 #elif (defined ARM)
1613 static Elf32_Half running_arch_code=EM_ARM;
1614 #else
1615 #error Method os::dll_load requires that one of following is defined:\
1616 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1617 #endif
1618
1619 // Identify compatability class for VM's architecture and library's architecture
1620 // Obtain string descriptions for architectures
1621
1622 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1623 int running_arch_index=-1;
1624
1625 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1626 if (running_arch_code == arch_array[i].code) {
1627 running_arch_index = i;
1628 }
1629 if (lib_arch.code == arch_array[i].code) {
1630 lib_arch.compat_class = arch_array[i].compat_class;
1631 lib_arch.name = arch_array[i].name;
1632 }
1633 }
1634
1635 assert(running_arch_index != -1,
1636 "Didn't find running architecture code (running_arch_code) in arch_array");
1637 if (running_arch_index == -1) {
1638 // Even though running architecture detection failed
1639 // we may still continue with reporting dlerror() message
1640 return NULL;
1641 }
1642
1643 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1644 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1645 return NULL;
1646 }
1647
1648 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1649 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1650 return NULL;
1651 }
1652
1653 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1654 if (lib_arch.name!=NULL) {
1655 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1656 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1657 lib_arch.name, arch_array[running_arch_index].name);
1658 } else {
1659 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1660 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1661 lib_arch.code,
1662 arch_array[running_arch_index].name);
1663 }
1664 }
1665
1666 return NULL;
1667 }
1668
1669 void* os::dll_lookup(void* handle, const char* name) {
1670 return dlsym(handle, name);
1671 }
1672
1673 void* os::get_default_process_handle() {
1674 return (void*)::dlopen(NULL, RTLD_LAZY);
1675 }
1676
1677 int os::stat(const char *path, struct stat *sbuf) {
1678 char pathbuf[MAX_PATH];
1679 if (strlen(path) > MAX_PATH - 1) {
1680 errno = ENAMETOOLONG;
1681 return -1;
1682 }
1683 os::native_path(strcpy(pathbuf, path));
1684 return ::stat(pathbuf, sbuf);
1685 }
1686
1687 static inline time_t get_mtime(const char* filename) {
1688 struct stat st;
1689 int ret = os::stat(filename, &st);
1690 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1691 return st.st_mtime;
1692 }
1693
1694 int os::compare_file_modified_times(const char* file1, const char* file2) {
1695 time_t t1 = get_mtime(file1);
1696 time_t t2 = get_mtime(file2);
1697 return t1 - t2;
1698 }
1699
1700 static bool _print_ascii_file(const char* filename, outputStream* st) {
1701 int fd = ::open(filename, O_RDONLY);
1702 if (fd == -1) {
1703 return false;
1704 }
1705
1706 char buf[32];
1707 int bytes;
1708 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1709 st->print_raw(buf, bytes);
1710 }
1711
1712 ::close(fd);
1713
1714 return true;
1715 }
1716
1717 void os::print_os_info_brief(outputStream* st) {
1718 os::Solaris::print_distro_info(st);
1719
1720 os::Posix::print_uname_info(st);
1721
1722 os::Solaris::print_libversion_info(st);
1723 }
1724
1725 void os::print_os_info(outputStream* st) {
1726 st->print("OS:");
1727
1728 os::Solaris::print_distro_info(st);
1729
1730 os::Posix::print_uname_info(st);
1731
1732 os::Solaris::print_libversion_info(st);
1733
1734 os::Posix::print_rlimit_info(st);
1735
1736 os::Posix::print_load_average(st);
1737 }
1738
1739 void os::Solaris::print_distro_info(outputStream* st) {
1740 if (!_print_ascii_file("/etc/release", st)) {
1741 st->print("Solaris");
1742 }
1743 st->cr();
1744 }
1745
1746 void os::get_summary_os_info(char* buf, size_t buflen) {
1747 strncpy(buf, "Solaris", buflen); // default to plain solaris
1748 FILE* fp = fopen("/etc/release", "r");
1749 if (fp != NULL) {
1750 char tmp[256];
1751 // Only get the first line and chop out everything but the os name.
1752 if (fgets(tmp, sizeof(tmp), fp)) {
1753 char* ptr = tmp;
1754 // skip past whitespace characters
1755 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1756 if (*ptr != '\0') {
1757 char* nl = strchr(ptr, '\n');
1758 if (nl != NULL) *nl = '\0';
1759 strncpy(buf, ptr, buflen);
1760 }
1761 }
1762 fclose(fp);
1763 }
1764 }
1765
1766 void os::Solaris::print_libversion_info(outputStream* st) {
1767 st->print(" (T2 libthread)");
1768 st->cr();
1769 }
1770
1771 static bool check_addr0(outputStream* st) {
1772 jboolean status = false;
1773 const int read_chunk = 200;
1774 int ret = 0;
1775 int nmap = 0;
1776 int fd = ::open("/proc/self/map",O_RDONLY);
1777 if (fd >= 0) {
1778 prmap_t *p = NULL;
1779 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1780 if (NULL == mbuff) {
1781 ::close(fd);
1782 return status;
1783 }
1784 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1785 //check if read() has not read partial data
1786 if( 0 != ret % sizeof(prmap_t)){
1787 break;
1788 }
1789 nmap = ret / sizeof(prmap_t);
1790 p = (prmap_t *)mbuff;
1791 for(int i = 0; i < nmap; i++){
1792 if (p->pr_vaddr == 0x0) {
1793 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1794 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1795 st->print("Access: ");
1796 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1797 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1798 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1799 st->cr();
1800 status = true;
1801 }
1802 p++;
1803 }
1804 }
1805 free(mbuff);
1806 ::close(fd);
1807 }
1808 return status;
1809 }
1810
1811 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1812 // Get MHz with system call. We don't seem to already have this.
1813 processor_info_t stats;
1814 processorid_t id = getcpuid();
1815 int clock = 0;
1816 if (processor_info(id, &stats) != -1) {
1817 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1818 }
1819 #ifdef AMD64
1820 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1821 #else
1822 // must be sparc
1823 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1824 #endif
1825 }
1826
1827 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1828 // Nothing to do for now.
1829 }
1830
1831 void os::print_memory_info(outputStream* st) {
1832 st->print("Memory:");
1833 st->print(" %dk page", os::vm_page_size()>>10);
1834 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1835 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1836 st->cr();
1837 (void) check_addr0(st);
1838 }
1839
1840 // Moved from whole group, because we need them here for diagnostic
1841 // prints.
1842 static int Maxsignum = 0;
1843 static int *ourSigFlags = NULL;
1844
1845 int os::Solaris::get_our_sigflags(int sig) {
1846 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1847 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1848 return ourSigFlags[sig];
1849 }
1850
1851 void os::Solaris::set_our_sigflags(int sig, int flags) {
1852 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1853 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1854 ourSigFlags[sig] = flags;
1855 }
1856
1857
1858 static const char* get_signal_handler_name(address handler,
1859 char* buf, int buflen) {
1860 int offset;
1861 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1862 if (found) {
1863 // skip directory names
1864 const char *p1, *p2;
1865 p1 = buf;
1866 size_t len = strlen(os::file_separator());
1867 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1868 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1869 } else {
1870 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1871 }
1872 return buf;
1873 }
1874
1875 static void print_signal_handler(outputStream* st, int sig,
1876 char* buf, size_t buflen) {
1877 struct sigaction sa;
1878
1879 sigaction(sig, NULL, &sa);
1880
1881 st->print("%s: ", os::exception_name(sig, buf, buflen));
1882
1883 address handler = (sa.sa_flags & SA_SIGINFO)
1884 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1885 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1886
1887 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1888 st->print("SIG_DFL");
1889 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1890 st->print("SIG_IGN");
1891 } else {
1892 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1893 }
1894
1895 st->print(", sa_mask[0]=");
1896 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1897
1898 address rh = VMError::get_resetted_sighandler(sig);
1899 // May be, handler was resetted by VMError?
1900 if (rh != NULL) {
1901 handler = rh;
1902 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1903 }
1904
1905 st->print(", sa_flags=");
1906 os::Posix::print_sa_flags(st, sa.sa_flags);
1907
1908 // Check: is it our handler?
1909 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1910 // It is our signal handler
1911 // check for flags
1912 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1913 st->print(
1914 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1915 os::Solaris::get_our_sigflags(sig));
1916 }
1917 }
1918 st->cr();
1919 }
1920
1921 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1922 st->print_cr("Signal Handlers:");
1923 print_signal_handler(st, SIGSEGV, buf, buflen);
1924 print_signal_handler(st, SIGBUS , buf, buflen);
1925 print_signal_handler(st, SIGFPE , buf, buflen);
1926 print_signal_handler(st, SIGPIPE, buf, buflen);
1927 print_signal_handler(st, SIGXFSZ, buf, buflen);
1928 print_signal_handler(st, SIGILL , buf, buflen);
1929 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1930 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1931 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1932 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1933 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1934 }
1935
1936 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1937
1938 // Find the full path to the current module, libjvm.so
1939 void os::jvm_path(char *buf, jint buflen) {
1940 // Error checking.
1941 if (buflen < MAXPATHLEN) {
1942 assert(false, "must use a large-enough buffer");
1943 buf[0] = '\0';
1944 return;
1945 }
1946 // Lazy resolve the path to current module.
1947 if (saved_jvm_path[0] != 0) {
1948 strcpy(buf, saved_jvm_path);
1949 return;
1950 }
1951
1952 Dl_info dlinfo;
1953 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1954 assert(ret != 0, "cannot locate libjvm");
1955 if (ret != 0 && dlinfo.dli_fname != NULL) {
1956 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1957 return;
1958 }
1959 } else {
1960 buf[0] = '\0';
1961 return;
1962 }
1963
1964 if (Arguments::sun_java_launcher_is_altjvm()) {
1965 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1966 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1967 // If "/jre/lib/" appears at the right place in the string, then
1968 // assume we are installed in a JDK and we're done. Otherwise, check
1969 // for a JAVA_HOME environment variable and fix up the path so it
1970 // looks like libjvm.so is installed there (append a fake suffix
1971 // hotspot/libjvm.so).
1972 const char *p = buf + strlen(buf) - 1;
1973 for (int count = 0; p > buf && count < 5; ++count) {
1974 for (--p; p > buf && *p != '/'; --p)
1975 /* empty */ ;
1976 }
1977
1978 if (strncmp(p, "/jre/lib/", 9) != 0) {
1979 // Look for JAVA_HOME in the environment.
1980 char* java_home_var = ::getenv("JAVA_HOME");
1981 if (java_home_var != NULL && java_home_var[0] != 0) {
1982 char* jrelib_p;
1983 int len;
1984
1985 // Check the current module name "libjvm.so".
1986 p = strrchr(buf, '/');
1987 assert(strstr(p, "/libjvm") == p, "invalid library name");
1988
1989 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
1990 return;
1991 }
1992 // determine if this is a legacy image or modules image
1993 // modules image doesn't have "jre" subdirectory
1994 len = strlen(buf);
1995 assert(len < buflen, "Ran out of buffer space");
1996 jrelib_p = buf + len;
1997 snprintf(jrelib_p, buflen-len, "/jre/lib");
1998 if (0 != access(buf, F_OK)) {
1999 snprintf(jrelib_p, buflen-len, "/lib");
2000 }
2001
2002 if (0 == access(buf, F_OK)) {
2003 // Use current module name "libjvm.so"
2004 len = strlen(buf);
2005 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2006 } else {
2007 // Go back to path of .so
2008 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2009 return;
2010 }
2011 }
2012 }
2013 }
2014 }
2015
2016 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2017 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2018 }
2019
2020
2021 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2022 // no prefix required, not even "_"
2023 }
2024
2025
2026 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2027 // no suffix required
2028 }
2029
2030 // This method is a copy of JDK's sysGetLastErrorString
2031 // from src/solaris/hpi/src/system_md.c
2032
2033 size_t os::lasterror(char *buf, size_t len) {
2034 if (errno == 0) return 0;
2035
2036 const char *s = os::strerror(errno);
2037 size_t n = ::strlen(s);
2038 if (n >= len) {
2039 n = len - 1;
2040 }
2041 ::strncpy(buf, s, n);
2042 buf[n] = '\0';
2043 return n;
2044 }
2045
2046
2047 // sun.misc.Signal
2048
2049 extern "C" {
2050 static void UserHandler(int sig, void *siginfo, void *context) {
2051 // Ctrl-C is pressed during error reporting, likely because the error
2052 // handler fails to abort. Let VM die immediately.
2053 if (sig == SIGINT && VMError::is_error_reported()) {
2054 os::die();
2055 }
2056
2057 os::signal_notify(sig);
2058 // We do not need to reinstate the signal handler each time...
2059 }
2060 }
2061
2062 void* os::user_handler() {
2063 return CAST_FROM_FN_PTR(void*, UserHandler);
2064 }
2065
2066 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2067 struct timespec ts;
2068 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2069
2070 return ts;
2071 }
2072
2073 extern "C" {
2074 typedef void (*sa_handler_t)(int);
2075 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2076 }
2077
2078 void* os::signal(int signal_number, void* handler) {
2079 struct sigaction sigAct, oldSigAct;
2080 sigfillset(&(sigAct.sa_mask));
2081 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2082 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2083
2084 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2085 // -1 means registration failed
2086 return (void *)-1;
2087 }
2088
2089 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2090 }
2091
2092 void os::signal_raise(int signal_number) {
2093 raise(signal_number);
2094 }
2095
2096 // The following code is moved from os.cpp for making this
2097 // code platform specific, which it is by its very nature.
2098
2099 // a counter for each possible signal value
2100 static int Sigexit = 0;
2101 static jint *pending_signals = NULL;
2102 static int *preinstalled_sigs = NULL;
2103 static struct sigaction *chainedsigactions = NULL;
2104 static sema_t sig_sem;
2105 typedef int (*version_getting_t)();
2106 version_getting_t os::Solaris::get_libjsig_version = NULL;
2107
2108 int os::sigexitnum_pd() {
2109 assert(Sigexit > 0, "signal memory not yet initialized");
2110 return Sigexit;
2111 }
2112
2113 void os::Solaris::init_signal_mem() {
2114 // Initialize signal structures
2115 Maxsignum = SIGRTMAX;
2116 Sigexit = Maxsignum+1;
2117 assert(Maxsignum >0, "Unable to obtain max signal number");
2118
2119 // pending_signals has one int per signal
2120 // The additional signal is for SIGEXIT - exit signal to signal_thread
2121 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2122 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2123
2124 if (UseSignalChaining) {
2125 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2126 * (Maxsignum + 1), mtInternal);
2127 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2128 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2129 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2130 }
2131 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2132 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2133 }
2134
2135 void os::signal_init_pd() {
2136 int ret;
2137
2138 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2139 assert(ret == 0, "sema_init() failed");
2140 }
2141
2142 void os::signal_notify(int signal_number) {
2143 int ret;
2144
2145 Atomic::inc(&pending_signals[signal_number]);
2146 ret = ::sema_post(&sig_sem);
2147 assert(ret == 0, "sema_post() failed");
2148 }
2149
2150 static int check_pending_signals(bool wait_for_signal) {
2151 int ret;
2152 while (true) {
2153 for (int i = 0; i < Sigexit + 1; i++) {
2154 jint n = pending_signals[i];
2155 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2156 return i;
2157 }
2158 }
2159 if (!wait_for_signal) {
2160 return -1;
2161 }
2162 JavaThread *thread = JavaThread::current();
2163 ThreadBlockInVM tbivm(thread);
2164
2165 bool threadIsSuspended;
2166 do {
2167 thread->set_suspend_equivalent();
2168 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2169 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2170 ;
2171 assert(ret == 0, "sema_wait() failed");
2172
2173 // were we externally suspended while we were waiting?
2174 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2175 if (threadIsSuspended) {
2176 // The semaphore has been incremented, but while we were waiting
2177 // another thread suspended us. We don't want to continue running
2178 // while suspended because that would surprise the thread that
2179 // suspended us.
2180 ret = ::sema_post(&sig_sem);
2181 assert(ret == 0, "sema_post() failed");
2182
2183 thread->java_suspend_self();
2184 }
2185 } while (threadIsSuspended);
2186 }
2187 }
2188
2189 int os::signal_lookup() {
2190 return check_pending_signals(false);
2191 }
2192
2193 int os::signal_wait() {
2194 return check_pending_signals(true);
2195 }
2196
2197 ////////////////////////////////////////////////////////////////////////////////
2198 // Virtual Memory
2199
2200 static int page_size = -1;
2201
2202 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2203 // clear this var if support is not available.
2204 static bool has_map_align = true;
2205
2206 int os::vm_page_size() {
2207 assert(page_size != -1, "must call os::init");
2208 return page_size;
2209 }
2210
2211 // Solaris allocates memory by pages.
2212 int os::vm_allocation_granularity() {
2213 assert(page_size != -1, "must call os::init");
2214 return page_size;
2215 }
2216
2217 static bool recoverable_mmap_error(int err) {
2218 // See if the error is one we can let the caller handle. This
2219 // list of errno values comes from the Solaris mmap(2) man page.
2220 switch (err) {
2221 case EBADF:
2222 case EINVAL:
2223 case ENOTSUP:
2224 // let the caller deal with these errors
2225 return true;
2226
2227 default:
2228 // Any remaining errors on this OS can cause our reserved mapping
2229 // to be lost. That can cause confusion where different data
2230 // structures think they have the same memory mapped. The worst
2231 // scenario is if both the VM and a library think they have the
2232 // same memory mapped.
2233 return false;
2234 }
2235 }
2236
2237 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2238 int err) {
2239 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2240 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2241 os::strerror(err), err);
2242 }
2243
2244 static void warn_fail_commit_memory(char* addr, size_t bytes,
2245 size_t alignment_hint, bool exec,
2246 int err) {
2247 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2248 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2249 alignment_hint, exec, os::strerror(err), err);
2250 }
2251
2252 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2253 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2254 size_t size = bytes;
2255 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2256 if (res != NULL) {
2257 if (UseNUMAInterleaving) {
2258 numa_make_global(addr, bytes);
2259 }
2260 return 0;
2261 }
2262
2263 int err = errno; // save errno from mmap() call in mmap_chunk()
2264
2265 if (!recoverable_mmap_error(err)) {
2266 warn_fail_commit_memory(addr, bytes, exec, err);
2267 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2268 }
2269
2270 return err;
2271 }
2272
2273 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2274 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2275 }
2276
2277 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2278 const char* mesg) {
2279 assert(mesg != NULL, "mesg must be specified");
2280 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2281 if (err != 0) {
2282 // the caller wants all commit errors to exit with the specified mesg:
2283 warn_fail_commit_memory(addr, bytes, exec, err);
2284 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2285 }
2286 }
2287
2288 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2289 assert(is_aligned(alignment, (size_t) vm_page_size()),
2290 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2291 alignment, (size_t) vm_page_size());
2292
2293 for (int i = 0; _page_sizes[i] != 0; i++) {
2294 if (is_aligned(alignment, _page_sizes[i])) {
2295 return _page_sizes[i];
2296 }
2297 }
2298
2299 return (size_t) vm_page_size();
2300 }
2301
2302 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2303 size_t alignment_hint, bool exec) {
2304 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2305 if (err == 0 && UseLargePages && alignment_hint > 0) {
2306 assert(is_aligned(bytes, alignment_hint),
2307 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2308
2309 // The syscall memcntl requires an exact page size (see man memcntl for details).
2310 size_t page_size = page_size_for_alignment(alignment_hint);
2311 if (page_size > (size_t) vm_page_size()) {
2312 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2313 }
2314 }
2315 return err;
2316 }
2317
2318 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2319 bool exec) {
2320 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2321 }
2322
2323 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2324 size_t alignment_hint, bool exec,
2325 const char* mesg) {
2326 assert(mesg != NULL, "mesg must be specified");
2327 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2328 if (err != 0) {
2329 // the caller wants all commit errors to exit with the specified mesg:
2330 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2331 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2332 }
2333 }
2334
2335 // Uncommit the pages in a specified region.
2336 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2337 if (madvise(addr, bytes, MADV_FREE) < 0) {
2338 debug_only(warning("MADV_FREE failed."));
2339 return;
2340 }
2341 }
2342
2343 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2344 return os::commit_memory(addr, size, !ExecMem);
2345 }
2346
2347 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2348 return os::uncommit_memory(addr, size);
2349 }
2350
2351 // Change the page size in a given range.
2352 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2353 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2354 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2355 if (UseLargePages) {
2356 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2357 if (page_size > (size_t) vm_page_size()) {
2358 Solaris::setup_large_pages(addr, bytes, page_size);
2359 }
2360 }
2361 }
2362
2363 // Tell the OS to make the range local to the first-touching LWP
2364 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2365 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2366 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2367 debug_only(warning("MADV_ACCESS_LWP failed."));
2368 }
2369 }
2370
2371 // Tell the OS that this range would be accessed from different LWPs.
2372 void os::numa_make_global(char *addr, size_t bytes) {
2373 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2374 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2375 debug_only(warning("MADV_ACCESS_MANY failed."));
2376 }
2377 }
2378
2379 // Get the number of the locality groups.
2380 size_t os::numa_get_groups_num() {
2381 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2382 return n != -1 ? n : 1;
2383 }
2384
2385 // Get a list of leaf locality groups. A leaf lgroup is group that
2386 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2387 // board. An LWP is assigned to one of these groups upon creation.
2388 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2389 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2390 ids[0] = 0;
2391 return 1;
2392 }
2393 int result_size = 0, top = 1, bottom = 0, cur = 0;
2394 for (int k = 0; k < size; k++) {
2395 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2396 (Solaris::lgrp_id_t*)&ids[top], size - top);
2397 if (r == -1) {
2398 ids[0] = 0;
2399 return 1;
2400 }
2401 if (!r) {
2402 // That's a leaf node.
2403 assert(bottom <= cur, "Sanity check");
2404 // Check if the node has memory
2405 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2406 NULL, 0, LGRP_RSRC_MEM) > 0) {
2407 ids[bottom++] = ids[cur];
2408 }
2409 }
2410 top += r;
2411 cur++;
2412 }
2413 if (bottom == 0) {
2414 // Handle a situation, when the OS reports no memory available.
2415 // Assume UMA architecture.
2416 ids[0] = 0;
2417 return 1;
2418 }
2419 return bottom;
2420 }
2421
2422 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2423 bool os::numa_topology_changed() {
2424 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2425 if (is_stale != -1 && is_stale) {
2426 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2427 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2428 assert(c != 0, "Failure to initialize LGRP API");
2429 Solaris::set_lgrp_cookie(c);
2430 return true;
2431 }
2432 return false;
2433 }
2434
2435 // Get the group id of the current LWP.
2436 int os::numa_get_group_id() {
2437 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2438 if (lgrp_id == -1) {
2439 return 0;
2440 }
2441 const int size = os::numa_get_groups_num();
2442 int *ids = (int*)alloca(size * sizeof(int));
2443
2444 // Get the ids of all lgroups with memory; r is the count.
2445 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2446 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2447 if (r <= 0) {
2448 return 0;
2449 }
2450 return ids[os::random() % r];
2451 }
2452
2453 // Request information about the page.
2454 bool os::get_page_info(char *start, page_info* info) {
2455 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2456 uint64_t addr = (uintptr_t)start;
2457 uint64_t outdata[2];
2458 uint_t validity = 0;
2459
2460 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2461 return false;
2462 }
2463
2464 info->size = 0;
2465 info->lgrp_id = -1;
2466
2467 if ((validity & 1) != 0) {
2468 if ((validity & 2) != 0) {
2469 info->lgrp_id = outdata[0];
2470 }
2471 if ((validity & 4) != 0) {
2472 info->size = outdata[1];
2473 }
2474 return true;
2475 }
2476 return false;
2477 }
2478
2479 // Scan the pages from start to end until a page different than
2480 // the one described in the info parameter is encountered.
2481 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2482 page_info* page_found) {
2483 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2484 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2485 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2486 uint_t validity[MAX_MEMINFO_CNT];
2487
2488 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2489 uint64_t p = (uint64_t)start;
2490 while (p < (uint64_t)end) {
2491 addrs[0] = p;
2492 size_t addrs_count = 1;
2493 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2494 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2495 addrs_count++;
2496 }
2497
2498 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2499 return NULL;
2500 }
2501
2502 size_t i = 0;
2503 for (; i < addrs_count; i++) {
2504 if ((validity[i] & 1) != 0) {
2505 if ((validity[i] & 4) != 0) {
2506 if (outdata[types * i + 1] != page_expected->size) {
2507 break;
2508 }
2509 } else if (page_expected->size != 0) {
2510 break;
2511 }
2512
2513 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2514 if (outdata[types * i] != page_expected->lgrp_id) {
2515 break;
2516 }
2517 }
2518 } else {
2519 return NULL;
2520 }
2521 }
2522
2523 if (i < addrs_count) {
2524 if ((validity[i] & 2) != 0) {
2525 page_found->lgrp_id = outdata[types * i];
2526 } else {
2527 page_found->lgrp_id = -1;
2528 }
2529 if ((validity[i] & 4) != 0) {
2530 page_found->size = outdata[types * i + 1];
2531 } else {
2532 page_found->size = 0;
2533 }
2534 return (char*)addrs[i];
2535 }
2536
2537 p = addrs[addrs_count - 1] + page_size;
2538 }
2539 return end;
2540 }
2541
2542 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2543 size_t size = bytes;
2544 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2545 // uncommitted page. Otherwise, the read/write might succeed if we
2546 // have enough swap space to back the physical page.
2547 return
2548 NULL != Solaris::mmap_chunk(addr, size,
2549 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2550 PROT_NONE);
2551 }
2552
2553 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2554 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2555
2556 if (b == MAP_FAILED) {
2557 return NULL;
2558 }
2559 return b;
2560 }
2561
2562 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2563 size_t alignment_hint, bool fixed) {
2564 char* addr = requested_addr;
2565 int flags = MAP_PRIVATE | MAP_NORESERVE;
2566
2567 assert(!(fixed && (alignment_hint > 0)),
2568 "alignment hint meaningless with fixed mmap");
2569
2570 if (fixed) {
2571 flags |= MAP_FIXED;
2572 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2573 flags |= MAP_ALIGN;
2574 addr = (char*) alignment_hint;
2575 }
2576
2577 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2578 // uncommitted page. Otherwise, the read/write might succeed if we
2579 // have enough swap space to back the physical page.
2580 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2581 }
2582
2583 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2584 size_t alignment_hint) {
2585 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2586 (requested_addr != NULL));
2587
2588 guarantee(requested_addr == NULL || requested_addr == addr,
2589 "OS failed to return requested mmap address.");
2590 return addr;
2591 }
2592
2593 // Reserve memory at an arbitrary address, only if that area is
2594 // available (and not reserved for something else).
2595
2596 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2597 const int max_tries = 10;
2598 char* base[max_tries];
2599 size_t size[max_tries];
2600
2601 // Solaris adds a gap between mmap'ed regions. The size of the gap
2602 // is dependent on the requested size and the MMU. Our initial gap
2603 // value here is just a guess and will be corrected later.
2604 bool had_top_overlap = false;
2605 bool have_adjusted_gap = false;
2606 size_t gap = 0x400000;
2607
2608 // Assert only that the size is a multiple of the page size, since
2609 // that's all that mmap requires, and since that's all we really know
2610 // about at this low abstraction level. If we need higher alignment,
2611 // we can either pass an alignment to this method or verify alignment
2612 // in one of the methods further up the call chain. See bug 5044738.
2613 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2614
2615 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2616 // Give it a try, if the kernel honors the hint we can return immediately.
2617 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2618
2619 volatile int err = errno;
2620 if (addr == requested_addr) {
2621 return addr;
2622 } else if (addr != NULL) {
2623 pd_unmap_memory(addr, bytes);
2624 }
2625
2626 if (log_is_enabled(Warning, os)) {
2627 char buf[256];
2628 buf[0] = '\0';
2629 if (addr == NULL) {
2630 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2631 }
2632 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2633 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2634 "%s", bytes, requested_addr, addr, buf);
2635 }
2636
2637 // Address hint method didn't work. Fall back to the old method.
2638 // In theory, once SNV becomes our oldest supported platform, this
2639 // code will no longer be needed.
2640 //
2641 // Repeatedly allocate blocks until the block is allocated at the
2642 // right spot. Give up after max_tries.
2643 int i;
2644 for (i = 0; i < max_tries; ++i) {
2645 base[i] = reserve_memory(bytes);
2646
2647 if (base[i] != NULL) {
2648 // Is this the block we wanted?
2649 if (base[i] == requested_addr) {
2650 size[i] = bytes;
2651 break;
2652 }
2653
2654 // check that the gap value is right
2655 if (had_top_overlap && !have_adjusted_gap) {
2656 size_t actual_gap = base[i-1] - base[i] - bytes;
2657 if (gap != actual_gap) {
2658 // adjust the gap value and retry the last 2 allocations
2659 assert(i > 0, "gap adjustment code problem");
2660 have_adjusted_gap = true; // adjust the gap only once, just in case
2661 gap = actual_gap;
2662 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2663 unmap_memory(base[i], bytes);
2664 unmap_memory(base[i-1], size[i-1]);
2665 i-=2;
2666 continue;
2667 }
2668 }
2669
2670 // Does this overlap the block we wanted? Give back the overlapped
2671 // parts and try again.
2672 //
2673 // There is still a bug in this code: if top_overlap == bytes,
2674 // the overlap is offset from requested region by the value of gap.
2675 // In this case giving back the overlapped part will not work,
2676 // because we'll give back the entire block at base[i] and
2677 // therefore the subsequent allocation will not generate a new gap.
2678 // This could be fixed with a new algorithm that used larger
2679 // or variable size chunks to find the requested region -
2680 // but such a change would introduce additional complications.
2681 // It's rare enough that the planets align for this bug,
2682 // so we'll just wait for a fix for 6204603/5003415 which
2683 // will provide a mmap flag to allow us to avoid this business.
2684
2685 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2686 if (top_overlap >= 0 && top_overlap < bytes) {
2687 had_top_overlap = true;
2688 unmap_memory(base[i], top_overlap);
2689 base[i] += top_overlap;
2690 size[i] = bytes - top_overlap;
2691 } else {
2692 size_t bottom_overlap = base[i] + bytes - requested_addr;
2693 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2694 if (bottom_overlap == 0) {
2695 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2696 }
2697 unmap_memory(requested_addr, bottom_overlap);
2698 size[i] = bytes - bottom_overlap;
2699 } else {
2700 size[i] = bytes;
2701 }
2702 }
2703 }
2704 }
2705
2706 // Give back the unused reserved pieces.
2707
2708 for (int j = 0; j < i; ++j) {
2709 if (base[j] != NULL) {
2710 unmap_memory(base[j], size[j]);
2711 }
2712 }
2713
2714 return (i < max_tries) ? requested_addr : NULL;
2715 }
2716
2717 bool os::pd_release_memory(char* addr, size_t bytes) {
2718 size_t size = bytes;
2719 return munmap(addr, size) == 0;
2720 }
2721
2722 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2723 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2724 "addr must be page aligned");
2725 int retVal = mprotect(addr, bytes, prot);
2726 return retVal == 0;
2727 }
2728
2729 // Protect memory (Used to pass readonly pages through
2730 // JNI GetArray<type>Elements with empty arrays.)
2731 // Also, used for serialization page and for compressed oops null pointer
2732 // checking.
2733 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2734 bool is_committed) {
2735 unsigned int p = 0;
2736 switch (prot) {
2737 case MEM_PROT_NONE: p = PROT_NONE; break;
2738 case MEM_PROT_READ: p = PROT_READ; break;
2739 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2740 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2741 default:
2742 ShouldNotReachHere();
2743 }
2744 // is_committed is unused.
2745 return solaris_mprotect(addr, bytes, p);
2746 }
2747
2748 // guard_memory and unguard_memory only happens within stack guard pages.
2749 // Since ISM pertains only to the heap, guard and unguard memory should not
2750 /// happen with an ISM region.
2751 bool os::guard_memory(char* addr, size_t bytes) {
2752 return solaris_mprotect(addr, bytes, PROT_NONE);
2753 }
2754
2755 bool os::unguard_memory(char* addr, size_t bytes) {
2756 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2757 }
2758
2759 // Large page support
2760 static size_t _large_page_size = 0;
2761
2762 // Insertion sort for small arrays (descending order).
2763 static void insertion_sort_descending(size_t* array, int len) {
2764 for (int i = 0; i < len; i++) {
2765 size_t val = array[i];
2766 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2767 size_t tmp = array[key];
2768 array[key] = array[key - 1];
2769 array[key - 1] = tmp;
2770 }
2771 }
2772 }
2773
2774 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2775 const unsigned int usable_count = VM_Version::page_size_count();
2776 if (usable_count == 1) {
2777 return false;
2778 }
2779
2780 // Find the right getpagesizes interface. When solaris 11 is the minimum
2781 // build platform, getpagesizes() (without the '2') can be called directly.
2782 typedef int (*gps_t)(size_t[], int);
2783 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2784 if (gps_func == NULL) {
2785 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2786 if (gps_func == NULL) {
2787 if (warn) {
2788 warning("MPSS is not supported by the operating system.");
2789 }
2790 return false;
2791 }
2792 }
2793
2794 // Fill the array of page sizes.
2795 int n = (*gps_func)(_page_sizes, page_sizes_max);
2796 assert(n > 0, "Solaris bug?");
2797
2798 if (n == page_sizes_max) {
2799 // Add a sentinel value (necessary only if the array was completely filled
2800 // since it is static (zeroed at initialization)).
2801 _page_sizes[--n] = 0;
2802 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2803 }
2804 assert(_page_sizes[n] == 0, "missing sentinel");
2805 trace_page_sizes("available page sizes", _page_sizes, n);
2806
2807 if (n == 1) return false; // Only one page size available.
2808
2809 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2810 // select up to usable_count elements. First sort the array, find the first
2811 // acceptable value, then copy the usable sizes to the top of the array and
2812 // trim the rest. Make sure to include the default page size :-).
2813 //
2814 // A better policy could get rid of the 4M limit by taking the sizes of the
2815 // important VM memory regions (java heap and possibly the code cache) into
2816 // account.
2817 insertion_sort_descending(_page_sizes, n);
2818 const size_t size_limit =
2819 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2820 int beg;
2821 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2822 const int end = MIN2((int)usable_count, n) - 1;
2823 for (int cur = 0; cur < end; ++cur, ++beg) {
2824 _page_sizes[cur] = _page_sizes[beg];
2825 }
2826 _page_sizes[end] = vm_page_size();
2827 _page_sizes[end + 1] = 0;
2828
2829 if (_page_sizes[end] > _page_sizes[end - 1]) {
2830 // Default page size is not the smallest; sort again.
2831 insertion_sort_descending(_page_sizes, end + 1);
2832 }
2833 *page_size = _page_sizes[0];
2834
2835 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2836 return true;
2837 }
2838
2839 void os::large_page_init() {
2840 if (UseLargePages) {
2841 // print a warning if any large page related flag is specified on command line
2842 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2843 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2844
2845 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2846 }
2847 }
2848
2849 bool os::Solaris::is_valid_page_size(size_t bytes) {
2850 for (int i = 0; _page_sizes[i] != 0; i++) {
2851 if (_page_sizes[i] == bytes) {
2852 return true;
2853 }
2854 }
2855 return false;
2856 }
2857
2858 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2859 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2860 assert(is_aligned((void*) start, align),
2861 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2862 assert(is_aligned(bytes, align),
2863 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2864
2865 // Signal to OS that we want large pages for addresses
2866 // from addr, addr + bytes
2867 struct memcntl_mha mpss_struct;
2868 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2869 mpss_struct.mha_pagesize = align;
2870 mpss_struct.mha_flags = 0;
2871 // Upon successful completion, memcntl() returns 0
2872 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2873 debug_only(warning("Attempt to use MPSS failed."));
2874 return false;
2875 }
2876 return true;
2877 }
2878
2879 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2880 fatal("os::reserve_memory_special should not be called on Solaris.");
2881 return NULL;
2882 }
2883
2884 bool os::release_memory_special(char* base, size_t bytes) {
2885 fatal("os::release_memory_special should not be called on Solaris.");
2886 return false;
2887 }
2888
2889 size_t os::large_page_size() {
2890 return _large_page_size;
2891 }
2892
2893 // MPSS allows application to commit large page memory on demand; with ISM
2894 // the entire memory region must be allocated as shared memory.
2895 bool os::can_commit_large_page_memory() {
2896 return true;
2897 }
2898
2899 bool os::can_execute_large_page_memory() {
2900 return true;
2901 }
2902
2903 // Read calls from inside the vm need to perform state transitions
2904 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2905 size_t res;
2906 JavaThread* thread = (JavaThread*)Thread::current();
2907 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2908 ThreadBlockInVM tbiv(thread);
2909 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2910 return res;
2911 }
2912
2913 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2914 size_t res;
2915 JavaThread* thread = (JavaThread*)Thread::current();
2916 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2917 ThreadBlockInVM tbiv(thread);
2918 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
2919 return res;
2920 }
2921
2922 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
2923 size_t res;
2924 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
2925 "Assumed _thread_in_native");
2926 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2927 return res;
2928 }
2929
2930 void os::naked_short_sleep(jlong ms) {
2931 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2932
2933 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
2934 // Solaris requires -lrt for this.
2935 usleep((ms * 1000));
2936
2937 return;
2938 }
2939
2940 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2941 void os::infinite_sleep() {
2942 while (true) { // sleep forever ...
2943 ::sleep(100); // ... 100 seconds at a time
2944 }
2945 }
2946
2947 // Used to convert frequent JVM_Yield() to nops
2948 bool os::dont_yield() {
2949 if (DontYieldALot) {
2950 static hrtime_t last_time = 0;
2951 hrtime_t diff = getTimeNanos() - last_time;
2952
2953 if (diff < DontYieldALotInterval * 1000000) {
2954 return true;
2955 }
2956
2957 last_time += diff;
2958
2959 return false;
2960 } else {
2961 return false;
2962 }
2963 }
2964
2965 // Note that yield semantics are defined by the scheduling class to which
2966 // the thread currently belongs. Typically, yield will _not yield to
2967 // other equal or higher priority threads that reside on the dispatch queues
2968 // of other CPUs.
2969
2970 void os::naked_yield() {
2971 thr_yield();
2972 }
2973
2974 // Interface for setting lwp priorities. We are using T2 libthread,
2975 // which forces the use of bound threads, so all of our threads will
2976 // be assigned to real lwp's. Using the thr_setprio function is
2977 // meaningless in this mode so we must adjust the real lwp's priority.
2978 // The routines below implement the getting and setting of lwp priorities.
2979 //
2980 // Note: There are three priority scales used on Solaris. Java priotities
2981 // which range from 1 to 10, libthread "thr_setprio" scale which range
2982 // from 0 to 127, and the current scheduling class of the process we
2983 // are running in. This is typically from -60 to +60.
2984 // The setting of the lwp priorities in done after a call to thr_setprio
2985 // so Java priorities are mapped to libthread priorities and we map from
2986 // the latter to lwp priorities. We don't keep priorities stored in
2987 // Java priorities since some of our worker threads want to set priorities
2988 // higher than all Java threads.
2989 //
2990 // For related information:
2991 // (1) man -s 2 priocntl
2992 // (2) man -s 4 priocntl
2993 // (3) man dispadmin
2994 // = librt.so
2995 // = libthread/common/rtsched.c - thrp_setlwpprio().
2996 // = ps -cL <pid> ... to validate priority.
2997 // = sched_get_priority_min and _max
2998 // pthread_create
2999 // sched_setparam
3000 // pthread_setschedparam
3001 //
3002 // Assumptions:
3003 // + We assume that all threads in the process belong to the same
3004 // scheduling class. IE. an homogenous process.
3005 // + Must be root or in IA group to change change "interactive" attribute.
3006 // Priocntl() will fail silently. The only indication of failure is when
3007 // we read-back the value and notice that it hasn't changed.
3008 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3009 // + For RT, change timeslice as well. Invariant:
3010 // constant "priority integral"
3011 // Konst == TimeSlice * (60-Priority)
3012 // Given a priority, compute appropriate timeslice.
3013 // + Higher numerical values have higher priority.
3014
3015 // sched class attributes
3016 typedef struct {
3017 int schedPolicy; // classID
3018 int maxPrio;
3019 int minPrio;
3020 } SchedInfo;
3021
3022
3023 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3024
3025 #ifdef ASSERT
3026 static int ReadBackValidate = 1;
3027 #endif
3028 static int myClass = 0;
3029 static int myMin = 0;
3030 static int myMax = 0;
3031 static int myCur = 0;
3032 static bool priocntl_enable = false;
3033
3034 static const int criticalPrio = FXCriticalPriority;
3035 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3036
3037
3038 // lwp_priocntl_init
3039 //
3040 // Try to determine the priority scale for our process.
3041 //
3042 // Return errno or 0 if OK.
3043 //
3044 static int lwp_priocntl_init() {
3045 int rslt;
3046 pcinfo_t ClassInfo;
3047 pcparms_t ParmInfo;
3048 int i;
3049
3050 if (!UseThreadPriorities) return 0;
3051
3052 // If ThreadPriorityPolicy is 1, switch tables
3053 if (ThreadPriorityPolicy == 1) {
3054 for (i = 0; i < CriticalPriority+1; i++)
3055 os::java_to_os_priority[i] = prio_policy1[i];
3056 }
3057 if (UseCriticalJavaThreadPriority) {
3058 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3059 // See set_native_priority() and set_lwp_class_and_priority().
3060 // Save original MaxPriority mapping in case attempt to
3061 // use critical priority fails.
3062 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3063 // Set negative to distinguish from other priorities
3064 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3065 }
3066
3067 // Get IDs for a set of well-known scheduling classes.
3068 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3069 // the system. We should have a loop that iterates over the
3070 // classID values, which are known to be "small" integers.
3071
3072 strcpy(ClassInfo.pc_clname, "TS");
3073 ClassInfo.pc_cid = -1;
3074 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3075 if (rslt < 0) return errno;
3076 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3077 tsLimits.schedPolicy = ClassInfo.pc_cid;
3078 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3079 tsLimits.minPrio = -tsLimits.maxPrio;
3080
3081 strcpy(ClassInfo.pc_clname, "IA");
3082 ClassInfo.pc_cid = -1;
3083 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3084 if (rslt < 0) return errno;
3085 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3086 iaLimits.schedPolicy = ClassInfo.pc_cid;
3087 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3088 iaLimits.minPrio = -iaLimits.maxPrio;
3089
3090 strcpy(ClassInfo.pc_clname, "RT");
3091 ClassInfo.pc_cid = -1;
3092 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3093 if (rslt < 0) return errno;
3094 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3095 rtLimits.schedPolicy = ClassInfo.pc_cid;
3096 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3097 rtLimits.minPrio = 0;
3098
3099 strcpy(ClassInfo.pc_clname, "FX");
3100 ClassInfo.pc_cid = -1;
3101 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3102 if (rslt < 0) return errno;
3103 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3104 fxLimits.schedPolicy = ClassInfo.pc_cid;
3105 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3106 fxLimits.minPrio = 0;
3107
3108 // Query our "current" scheduling class.
3109 // This will normally be IA, TS or, rarely, FX or RT.
3110 memset(&ParmInfo, 0, sizeof(ParmInfo));
3111 ParmInfo.pc_cid = PC_CLNULL;
3112 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3113 if (rslt < 0) return errno;
3114 myClass = ParmInfo.pc_cid;
3115
3116 // We now know our scheduling classId, get specific information
3117 // about the class.
3118 ClassInfo.pc_cid = myClass;
3119 ClassInfo.pc_clname[0] = 0;
3120 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3121 if (rslt < 0) return errno;
3122
3123 if (ThreadPriorityVerbose) {
3124 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3125 }
3126
3127 memset(&ParmInfo, 0, sizeof(pcparms_t));
3128 ParmInfo.pc_cid = PC_CLNULL;
3129 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3130 if (rslt < 0) return errno;
3131
3132 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3133 myMin = rtLimits.minPrio;
3134 myMax = rtLimits.maxPrio;
3135 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3136 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3137 myMin = iaLimits.minPrio;
3138 myMax = iaLimits.maxPrio;
3139 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3140 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3141 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3142 myMin = tsLimits.minPrio;
3143 myMax = tsLimits.maxPrio;
3144 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3145 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3146 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3147 myMin = fxLimits.minPrio;
3148 myMax = fxLimits.maxPrio;
3149 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3150 } else {
3151 // No clue - punt
3152 if (ThreadPriorityVerbose) {
3153 tty->print_cr("Unknown scheduling class: %s ... \n",
3154 ClassInfo.pc_clname);
3155 }
3156 return EINVAL; // no clue, punt
3157 }
3158
3159 if (ThreadPriorityVerbose) {
3160 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3161 }
3162
3163 priocntl_enable = true; // Enable changing priorities
3164 return 0;
3165 }
3166
3167 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3168 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3169 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3170 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3171
3172
3173 // scale_to_lwp_priority
3174 //
3175 // Convert from the libthread "thr_setprio" scale to our current
3176 // lwp scheduling class scale.
3177 //
3178 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3179 int v;
3180
3181 if (x == 127) return rMax; // avoid round-down
3182 v = (((x*(rMax-rMin)))/128)+rMin;
3183 return v;
3184 }
3185
3186
3187 // set_lwp_class_and_priority
3188 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3189 int newPrio, int new_class, bool scale) {
3190 int rslt;
3191 int Actual, Expected, prv;
3192 pcparms_t ParmInfo; // for GET-SET
3193 #ifdef ASSERT
3194 pcparms_t ReadBack; // for readback
3195 #endif
3196
3197 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3198 // Query current values.
3199 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3200 // Cache "pcparms_t" in global ParmCache.
3201 // TODO: elide set-to-same-value
3202
3203 // If something went wrong on init, don't change priorities.
3204 if (!priocntl_enable) {
3205 if (ThreadPriorityVerbose) {
3206 tty->print_cr("Trying to set priority but init failed, ignoring");
3207 }
3208 return EINVAL;
3209 }
3210
3211 // If lwp hasn't started yet, just return
3212 // the _start routine will call us again.
3213 if (lwpid <= 0) {
3214 if (ThreadPriorityVerbose) {
3215 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3216 INTPTR_FORMAT " to %d, lwpid not set",
3217 ThreadID, newPrio);
3218 }
3219 return 0;
3220 }
3221
3222 if (ThreadPriorityVerbose) {
3223 tty->print_cr ("set_lwp_class_and_priority("
3224 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3225 ThreadID, lwpid, newPrio);
3226 }
3227
3228 memset(&ParmInfo, 0, sizeof(pcparms_t));
3229 ParmInfo.pc_cid = PC_CLNULL;
3230 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3231 if (rslt < 0) return errno;
3232
3233 int cur_class = ParmInfo.pc_cid;
3234 ParmInfo.pc_cid = (id_t)new_class;
3235
3236 if (new_class == rtLimits.schedPolicy) {
3237 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3238 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3239 rtLimits.maxPrio, newPrio)
3240 : newPrio;
3241 rtInfo->rt_tqsecs = RT_NOCHANGE;
3242 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3243 if (ThreadPriorityVerbose) {
3244 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3245 }
3246 } else if (new_class == iaLimits.schedPolicy) {
3247 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3248 int maxClamped = MIN2(iaLimits.maxPrio,
3249 cur_class == new_class
3250 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3251 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3252 maxClamped, newPrio)
3253 : newPrio;
3254 iaInfo->ia_uprilim = cur_class == new_class
3255 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3256 iaInfo->ia_mode = IA_NOCHANGE;
3257 if (ThreadPriorityVerbose) {
3258 tty->print_cr("IA: [%d...%d] %d->%d\n",
3259 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3260 }
3261 } else if (new_class == tsLimits.schedPolicy) {
3262 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3263 int maxClamped = MIN2(tsLimits.maxPrio,
3264 cur_class == new_class
3265 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3266 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3267 maxClamped, newPrio)
3268 : newPrio;
3269 tsInfo->ts_uprilim = cur_class == new_class
3270 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3271 if (ThreadPriorityVerbose) {
3272 tty->print_cr("TS: [%d...%d] %d->%d\n",
3273 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3274 }
3275 } else if (new_class == fxLimits.schedPolicy) {
3276 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3277 int maxClamped = MIN2(fxLimits.maxPrio,
3278 cur_class == new_class
3279 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3280 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3281 maxClamped, newPrio)
3282 : newPrio;
3283 fxInfo->fx_uprilim = cur_class == new_class
3284 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3285 fxInfo->fx_tqsecs = FX_NOCHANGE;
3286 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3287 if (ThreadPriorityVerbose) {
3288 tty->print_cr("FX: [%d...%d] %d->%d\n",
3289 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3290 }
3291 } else {
3292 if (ThreadPriorityVerbose) {
3293 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3294 }
3295 return EINVAL; // no clue, punt
3296 }
3297
3298 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3299 if (ThreadPriorityVerbose && rslt) {
3300 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3301 }
3302 if (rslt < 0) return errno;
3303
3304 #ifdef ASSERT
3305 // Sanity check: read back what we just attempted to set.
3306 // In theory it could have changed in the interim ...
3307 //
3308 // The priocntl system call is tricky.
3309 // Sometimes it'll validate the priority value argument and
3310 // return EINVAL if unhappy. At other times it fails silently.
3311 // Readbacks are prudent.
3312
3313 if (!ReadBackValidate) return 0;
3314
3315 memset(&ReadBack, 0, sizeof(pcparms_t));
3316 ReadBack.pc_cid = PC_CLNULL;
3317 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3318 assert(rslt >= 0, "priocntl failed");
3319 Actual = Expected = 0xBAD;
3320 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3321 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3322 Actual = RTPRI(ReadBack)->rt_pri;
3323 Expected = RTPRI(ParmInfo)->rt_pri;
3324 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3325 Actual = IAPRI(ReadBack)->ia_upri;
3326 Expected = IAPRI(ParmInfo)->ia_upri;
3327 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3328 Actual = TSPRI(ReadBack)->ts_upri;
3329 Expected = TSPRI(ParmInfo)->ts_upri;
3330 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3331 Actual = FXPRI(ReadBack)->fx_upri;
3332 Expected = FXPRI(ParmInfo)->fx_upri;
3333 } else {
3334 if (ThreadPriorityVerbose) {
3335 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3336 ParmInfo.pc_cid);
3337 }
3338 }
3339
3340 if (Actual != Expected) {
3341 if (ThreadPriorityVerbose) {
3342 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3343 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3344 }
3345 }
3346 #endif
3347
3348 return 0;
3349 }
3350
3351 // Solaris only gives access to 128 real priorities at a time,
3352 // so we expand Java's ten to fill this range. This would be better
3353 // if we dynamically adjusted relative priorities.
3354 //
3355 // The ThreadPriorityPolicy option allows us to select 2 different
3356 // priority scales.
3357 //
3358 // ThreadPriorityPolicy=0
3359 // Since the Solaris' default priority is MaximumPriority, we do not
3360 // set a priority lower than Max unless a priority lower than
3361 // NormPriority is requested.
3362 //
3363 // ThreadPriorityPolicy=1
3364 // This mode causes the priority table to get filled with
3365 // linear values. NormPriority get's mapped to 50% of the
3366 // Maximum priority an so on. This will cause VM threads
3367 // to get unfair treatment against other Solaris processes
3368 // which do not explicitly alter their thread priorities.
3369
3370 int os::java_to_os_priority[CriticalPriority + 1] = {
3371 -99999, // 0 Entry should never be used
3372
3373 0, // 1 MinPriority
3374 32, // 2
3375 64, // 3
3376
3377 96, // 4
3378 127, // 5 NormPriority
3379 127, // 6
3380
3381 127, // 7
3382 127, // 8
3383 127, // 9 NearMaxPriority
3384
3385 127, // 10 MaxPriority
3386
3387 -criticalPrio // 11 CriticalPriority
3388 };
3389
3390 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3391 OSThread* osthread = thread->osthread();
3392
3393 // Save requested priority in case the thread hasn't been started
3394 osthread->set_native_priority(newpri);
3395
3396 // Check for critical priority request
3397 bool fxcritical = false;
3398 if (newpri == -criticalPrio) {
3399 fxcritical = true;
3400 newpri = criticalPrio;
3401 }
3402
3403 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3404 if (!UseThreadPriorities) return OS_OK;
3405
3406 int status = 0;
3407
3408 if (!fxcritical) {
3409 // Use thr_setprio only if we have a priority that thr_setprio understands
3410 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3411 }
3412
3413 int lwp_status =
3414 set_lwp_class_and_priority(osthread->thread_id(),
3415 osthread->lwp_id(),
3416 newpri,
3417 fxcritical ? fxLimits.schedPolicy : myClass,
3418 !fxcritical);
3419 if (lwp_status != 0 && fxcritical) {
3420 // Try again, this time without changing the scheduling class
3421 newpri = java_MaxPriority_to_os_priority;
3422 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3423 osthread->lwp_id(),
3424 newpri, myClass, false);
3425 }
3426 status |= lwp_status;
3427 return (status == 0) ? OS_OK : OS_ERR;
3428 }
3429
3430
3431 OSReturn os::get_native_priority(const Thread* const thread,
3432 int *priority_ptr) {
3433 int p;
3434 if (!UseThreadPriorities) {
3435 *priority_ptr = NormalPriority;
3436 return OS_OK;
3437 }
3438 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3439 if (status != 0) {
3440 return OS_ERR;
3441 }
3442 *priority_ptr = p;
3443 return OS_OK;
3444 }
3445
3446
3447 // Hint to the underlying OS that a task switch would not be good.
3448 // Void return because it's a hint and can fail.
3449 void os::hint_no_preempt() {
3450 schedctl_start(schedctl_init());
3451 }
3452
3453 ////////////////////////////////////////////////////////////////////////////////
3454 // suspend/resume support
3455
3456 // The low-level signal-based suspend/resume support is a remnant from the
3457 // old VM-suspension that used to be for java-suspension, safepoints etc,
3458 // within hotspot. Currently used by JFR's OSThreadSampler
3459 //
3460 // The remaining code is greatly simplified from the more general suspension
3461 // code that used to be used.
3462 //
3463 // The protocol is quite simple:
3464 // - suspend:
3465 // - sends a signal to the target thread
3466 // - polls the suspend state of the osthread using a yield loop
3467 // - target thread signal handler (SR_handler) sets suspend state
3468 // and blocks in sigsuspend until continued
3469 // - resume:
3470 // - sets target osthread state to continue
3471 // - sends signal to end the sigsuspend loop in the SR_handler
3472 //
3473 // Note that the SR_lock plays no role in this suspend/resume protocol,
3474 // but is checked for NULL in SR_handler as a thread termination indicator.
3475 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3476 //
3477 // Note that resume_clear_context() and suspend_save_context() are needed
3478 // by SR_handler(), so that fetch_frame_from_ucontext() works,
3479 // which in part is used by:
3480 // - Forte Analyzer: AsyncGetCallTrace()
3481 // - StackBanging: get_frame_at_stack_banging_point()
3482 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3483
3484 static void resume_clear_context(OSThread *osthread) {
3485 osthread->set_ucontext(NULL);
3486 }
3487
3488 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3489 osthread->set_ucontext(context);
3490 }
3491
3492 static PosixSemaphore sr_semaphore;
3493
3494 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3495 // Save and restore errno to avoid confusing native code with EINTR
3496 // after sigsuspend.
3497 int old_errno = errno;
3498
3499 OSThread* osthread = thread->osthread();
3500 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3501
3502 os::SuspendResume::State current = osthread->sr.state();
3503 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3504 suspend_save_context(osthread, context);
3505
3506 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3507 os::SuspendResume::State state = osthread->sr.suspended();
3508 if (state == os::SuspendResume::SR_SUSPENDED) {
3509 sigset_t suspend_set; // signals for sigsuspend()
3510
3511 // get current set of blocked signals and unblock resume signal
3512 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3513 sigdelset(&suspend_set, ASYNC_SIGNAL);
3514
3515 sr_semaphore.signal();
3516 // wait here until we are resumed
3517 while (1) {
3518 sigsuspend(&suspend_set);
3519
3520 os::SuspendResume::State result = osthread->sr.running();
3521 if (result == os::SuspendResume::SR_RUNNING) {
3522 sr_semaphore.signal();
3523 break;
3524 }
3525 }
3526
3527 } else if (state == os::SuspendResume::SR_RUNNING) {
3528 // request was cancelled, continue
3529 } else {
3530 ShouldNotReachHere();
3531 }
3532
3533 resume_clear_context(osthread);
3534 } else if (current == os::SuspendResume::SR_RUNNING) {
3535 // request was cancelled, continue
3536 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3537 // ignore
3538 } else {
3539 // ignore
3540 }
3541
3542 errno = old_errno;
3543 }
3544
3545 void os::print_statistics() {
3546 }
3547
3548 bool os::message_box(const char* title, const char* message) {
3549 int i;
3550 fdStream err(defaultStream::error_fd());
3551 for (i = 0; i < 78; i++) err.print_raw("=");
3552 err.cr();
3553 err.print_raw_cr(title);
3554 for (i = 0; i < 78; i++) err.print_raw("-");
3555 err.cr();
3556 err.print_raw_cr(message);
3557 for (i = 0; i < 78; i++) err.print_raw("=");
3558 err.cr();
3559
3560 char buf[16];
3561 // Prevent process from exiting upon "read error" without consuming all CPU
3562 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3563
3564 return buf[0] == 'y' || buf[0] == 'Y';
3565 }
3566
3567 static int sr_notify(OSThread* osthread) {
3568 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3569 assert_status(status == 0, status, "thr_kill");
3570 return status;
3571 }
3572
3573 // "Randomly" selected value for how long we want to spin
3574 // before bailing out on suspending a thread, also how often
3575 // we send a signal to a thread we want to resume
3576 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3577 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3578
3579 static bool do_suspend(OSThread* osthread) {
3580 assert(osthread->sr.is_running(), "thread should be running");
3581 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3582
3583 // mark as suspended and send signal
3584 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3585 // failed to switch, state wasn't running?
3586 ShouldNotReachHere();
3587 return false;
3588 }
3589
3590 if (sr_notify(osthread) != 0) {
3591 ShouldNotReachHere();
3592 }
3593
3594 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3595 while (true) {
3596 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3597 break;
3598 } else {
3599 // timeout
3600 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3601 if (cancelled == os::SuspendResume::SR_RUNNING) {
3602 return false;
3603 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3604 // make sure that we consume the signal on the semaphore as well
3605 sr_semaphore.wait();
3606 break;
3607 } else {
3608 ShouldNotReachHere();
3609 return false;
3610 }
3611 }
3612 }
3613
3614 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3615 return true;
3616 }
3617
3618 static void do_resume(OSThread* osthread) {
3619 assert(osthread->sr.is_suspended(), "thread should be suspended");
3620 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3621
3622 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3623 // failed to switch to WAKEUP_REQUEST
3624 ShouldNotReachHere();
3625 return;
3626 }
3627
3628 while (true) {
3629 if (sr_notify(osthread) == 0) {
3630 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3631 if (osthread->sr.is_running()) {
3632 return;
3633 }
3634 }
3635 } else {
3636 ShouldNotReachHere();
3637 }
3638 }
3639
3640 guarantee(osthread->sr.is_running(), "Must be running!");
3641 }
3642
3643 void os::SuspendedThreadTask::internal_do_task() {
3644 if (do_suspend(_thread->osthread())) {
3645 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3646 do_task(context);
3647 do_resume(_thread->osthread());
3648 }
3649 }
3650
3651 // This does not do anything on Solaris. This is basically a hook for being
3652 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3653 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3654 const methodHandle& method, JavaCallArguments* args,
3655 Thread* thread) {
3656 f(value, method, args, thread);
3657 }
3658
3659 // This routine may be used by user applications as a "hook" to catch signals.
3660 // The user-defined signal handler must pass unrecognized signals to this
3661 // routine, and if it returns true (non-zero), then the signal handler must
3662 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3663 // routine will never retun false (zero), but instead will execute a VM panic
3664 // routine kill the process.
3665 //
3666 // If this routine returns false, it is OK to call it again. This allows
3667 // the user-defined signal handler to perform checks either before or after
3668 // the VM performs its own checks. Naturally, the user code would be making
3669 // a serious error if it tried to handle an exception (such as a null check
3670 // or breakpoint) that the VM was generating for its own correct operation.
3671 //
3672 // This routine may recognize any of the following kinds of signals:
3673 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3674 // ASYNC_SIGNAL.
3675 // It should be consulted by handlers for any of those signals.
3676 //
3677 // The caller of this routine must pass in the three arguments supplied
3678 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3679 // field of the structure passed to sigaction(). This routine assumes that
3680 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3681 //
3682 // Note that the VM will print warnings if it detects conflicting signal
3683 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3684 //
3685 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3686 siginfo_t* siginfo,
3687 void* ucontext,
3688 int abort_if_unrecognized);
3689
3690
3691 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3692 int orig_errno = errno; // Preserve errno value over signal handler.
3693 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3694 errno = orig_errno;
3695 }
3696
3697 // This boolean allows users to forward their own non-matching signals
3698 // to JVM_handle_solaris_signal, harmlessly.
3699 bool os::Solaris::signal_handlers_are_installed = false;
3700
3701 // For signal-chaining
3702 bool os::Solaris::libjsig_is_loaded = false;
3703 typedef struct sigaction *(*get_signal_t)(int);
3704 get_signal_t os::Solaris::get_signal_action = NULL;
3705
3706 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3707 struct sigaction *actp = NULL;
3708
3709 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3710 // Retrieve the old signal handler from libjsig
3711 actp = (*get_signal_action)(sig);
3712 }
3713 if (actp == NULL) {
3714 // Retrieve the preinstalled signal handler from jvm
3715 actp = get_preinstalled_handler(sig);
3716 }
3717
3718 return actp;
3719 }
3720
3721 static bool call_chained_handler(struct sigaction *actp, int sig,
3722 siginfo_t *siginfo, void *context) {
3723 // Call the old signal handler
3724 if (actp->sa_handler == SIG_DFL) {
3725 // It's more reasonable to let jvm treat it as an unexpected exception
3726 // instead of taking the default action.
3727 return false;
3728 } else if (actp->sa_handler != SIG_IGN) {
3729 if ((actp->sa_flags & SA_NODEFER) == 0) {
3730 // automaticlly block the signal
3731 sigaddset(&(actp->sa_mask), sig);
3732 }
3733
3734 sa_handler_t hand;
3735 sa_sigaction_t sa;
3736 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3737 // retrieve the chained handler
3738 if (siginfo_flag_set) {
3739 sa = actp->sa_sigaction;
3740 } else {
3741 hand = actp->sa_handler;
3742 }
3743
3744 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3745 actp->sa_handler = SIG_DFL;
3746 }
3747
3748 // try to honor the signal mask
3749 sigset_t oset;
3750 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3751
3752 // call into the chained handler
3753 if (siginfo_flag_set) {
3754 (*sa)(sig, siginfo, context);
3755 } else {
3756 (*hand)(sig);
3757 }
3758
3759 // restore the signal mask
3760 pthread_sigmask(SIG_SETMASK, &oset, 0);
3761 }
3762 // Tell jvm's signal handler the signal is taken care of.
3763 return true;
3764 }
3765
3766 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3767 bool chained = false;
3768 // signal-chaining
3769 if (UseSignalChaining) {
3770 struct sigaction *actp = get_chained_signal_action(sig);
3771 if (actp != NULL) {
3772 chained = call_chained_handler(actp, sig, siginfo, context);
3773 }
3774 }
3775 return chained;
3776 }
3777
3778 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3779 assert((chainedsigactions != (struct sigaction *)NULL) &&
3780 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3781 if (preinstalled_sigs[sig] != 0) {
3782 return &chainedsigactions[sig];
3783 }
3784 return NULL;
3785 }
3786
3787 void os::Solaris::save_preinstalled_handler(int sig,
3788 struct sigaction& oldAct) {
3789 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3790 assert((chainedsigactions != (struct sigaction *)NULL) &&
3791 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3792 chainedsigactions[sig] = oldAct;
3793 preinstalled_sigs[sig] = 1;
3794 }
3795
3796 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3797 bool oktochain) {
3798 // Check for overwrite.
3799 struct sigaction oldAct;
3800 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3801 void* oldhand =
3802 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3803 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3804 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3805 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3806 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3807 if (AllowUserSignalHandlers || !set_installed) {
3808 // Do not overwrite; user takes responsibility to forward to us.
3809 return;
3810 } else if (UseSignalChaining) {
3811 if (oktochain) {
3812 // save the old handler in jvm
3813 save_preinstalled_handler(sig, oldAct);
3814 } else {
3815 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3816 }
3817 // libjsig also interposes the sigaction() call below and saves the
3818 // old sigaction on it own.
3819 } else {
3820 fatal("Encountered unexpected pre-existing sigaction handler "
3821 "%#lx for signal %d.", (long)oldhand, sig);
3822 }
3823 }
3824
3825 struct sigaction sigAct;
3826 sigfillset(&(sigAct.sa_mask));
3827 sigAct.sa_handler = SIG_DFL;
3828
3829 sigAct.sa_sigaction = signalHandler;
3830 // Handle SIGSEGV on alternate signal stack if
3831 // not using stack banging
3832 if (!UseStackBanging && sig == SIGSEGV) {
3833 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3834 } else {
3835 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3836 }
3837 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3838
3839 sigaction(sig, &sigAct, &oldAct);
3840
3841 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3842 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3843 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3844 }
3845
3846
3847 #define DO_SIGNAL_CHECK(sig) \
3848 do { \
3849 if (!sigismember(&check_signal_done, sig)) { \
3850 os::Solaris::check_signal_handler(sig); \
3851 } \
3852 } while (0)
3853
3854 // This method is a periodic task to check for misbehaving JNI applications
3855 // under CheckJNI, we can add any periodic checks here
3856
3857 void os::run_periodic_checks() {
3858 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3859 // thereby preventing a NULL checks.
3860 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3861
3862 if (check_signals == false) return;
3863
3864 // SEGV and BUS if overridden could potentially prevent
3865 // generation of hs*.log in the event of a crash, debugging
3866 // such a case can be very challenging, so we absolutely
3867 // check for the following for a good measure:
3868 DO_SIGNAL_CHECK(SIGSEGV);
3869 DO_SIGNAL_CHECK(SIGILL);
3870 DO_SIGNAL_CHECK(SIGFPE);
3871 DO_SIGNAL_CHECK(SIGBUS);
3872 DO_SIGNAL_CHECK(SIGPIPE);
3873 DO_SIGNAL_CHECK(SIGXFSZ);
3874 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3875
3876 // ReduceSignalUsage allows the user to override these handlers
3877 // see comments at the very top and jvm_solaris.h
3878 if (!ReduceSignalUsage) {
3879 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3880 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3881 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3882 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3883 }
3884 }
3885
3886 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3887
3888 static os_sigaction_t os_sigaction = NULL;
3889
3890 void os::Solaris::check_signal_handler(int sig) {
3891 char buf[O_BUFLEN];
3892 address jvmHandler = NULL;
3893
3894 struct sigaction act;
3895 if (os_sigaction == NULL) {
3896 // only trust the default sigaction, in case it has been interposed
3897 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3898 if (os_sigaction == NULL) return;
3899 }
3900
3901 os_sigaction(sig, (struct sigaction*)NULL, &act);
3902
3903 address thisHandler = (act.sa_flags & SA_SIGINFO)
3904 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3905 : CAST_FROM_FN_PTR(address, act.sa_handler);
3906
3907
3908 switch (sig) {
3909 case SIGSEGV:
3910 case SIGBUS:
3911 case SIGFPE:
3912 case SIGPIPE:
3913 case SIGXFSZ:
3914 case SIGILL:
3915 case ASYNC_SIGNAL:
3916 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3917 break;
3918
3919 case SHUTDOWN1_SIGNAL:
3920 case SHUTDOWN2_SIGNAL:
3921 case SHUTDOWN3_SIGNAL:
3922 case BREAK_SIGNAL:
3923 jvmHandler = (address)user_handler();
3924 break;
3925
3926 default:
3927 return;
3928 }
3929
3930 if (thisHandler != jvmHandler) {
3931 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3932 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3933 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3934 // No need to check this sig any longer
3935 sigaddset(&check_signal_done, sig);
3936 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3937 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3938 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3939 exception_name(sig, buf, O_BUFLEN));
3940 }
3941 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3942 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3943 tty->print("expected:");
3944 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3945 tty->cr();
3946 tty->print(" found:");
3947 os::Posix::print_sa_flags(tty, act.sa_flags);
3948 tty->cr();
3949 // No need to check this sig any longer
3950 sigaddset(&check_signal_done, sig);
3951 }
3952
3953 // Print all the signal handler state
3954 if (sigismember(&check_signal_done, sig)) {
3955 print_signal_handlers(tty, buf, O_BUFLEN);
3956 }
3957
3958 }
3959
3960 void os::Solaris::install_signal_handlers() {
3961 signal_handlers_are_installed = true;
3962
3963 // signal-chaining
3964 typedef void (*signal_setting_t)();
3965 signal_setting_t begin_signal_setting = NULL;
3966 signal_setting_t end_signal_setting = NULL;
3967 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3968 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3969 if (begin_signal_setting != NULL) {
3970 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3971 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3972 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3973 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3974 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
3975 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
3976 libjsig_is_loaded = true;
3977 if (os::Solaris::get_libjsig_version != NULL) {
3978 int libjsigversion = (*os::Solaris::get_libjsig_version)();
3979 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch");
3980 }
3981 assert(UseSignalChaining, "should enable signal-chaining");
3982 }
3983 if (libjsig_is_loaded) {
3984 // Tell libjsig jvm is setting signal handlers
3985 (*begin_signal_setting)();
3986 }
3987
3988 set_signal_handler(SIGSEGV, true, true);
3989 set_signal_handler(SIGPIPE, true, true);
3990 set_signal_handler(SIGXFSZ, true, true);
3991 set_signal_handler(SIGBUS, true, true);
3992 set_signal_handler(SIGILL, true, true);
3993 set_signal_handler(SIGFPE, true, true);
3994 set_signal_handler(ASYNC_SIGNAL, true, true);
3995
3996 if (libjsig_is_loaded) {
3997 // Tell libjsig jvm finishes setting signal handlers
3998 (*end_signal_setting)();
3999 }
4000
4001 // We don't activate signal checker if libjsig is in place, we trust ourselves
4002 // and if UserSignalHandler is installed all bets are off.
4003 // Log that signal checking is off only if -verbose:jni is specified.
4004 if (CheckJNICalls) {
4005 if (libjsig_is_loaded) {
4006 if (PrintJNIResolving) {
4007 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4008 }
4009 check_signals = false;
4010 }
4011 if (AllowUserSignalHandlers) {
4012 if (PrintJNIResolving) {
4013 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4014 }
4015 check_signals = false;
4016 }
4017 }
4018 }
4019
4020
4021 void report_error(const char* file_name, int line_no, const char* title,
4022 const char* format, ...);
4023
4024 // (Static) wrappers for the liblgrp API
4025 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4026 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4027 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4028 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4029 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4030 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4031 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4032 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4033 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4034
4035 static address resolve_symbol_lazy(const char* name) {
4036 address addr = (address) dlsym(RTLD_DEFAULT, name);
4037 if (addr == NULL) {
4038 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4039 addr = (address) dlsym(RTLD_NEXT, name);
4040 }
4041 return addr;
4042 }
4043
4044 static address resolve_symbol(const char* name) {
4045 address addr = resolve_symbol_lazy(name);
4046 if (addr == NULL) {
4047 fatal(dlerror());
4048 }
4049 return addr;
4050 }
4051
4052 void os::Solaris::libthread_init() {
4053 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4054
4055 lwp_priocntl_init();
4056
4057 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4058 if (func == NULL) {
4059 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4060 // Guarantee that this VM is running on an new enough OS (5.6 or
4061 // later) that it will have a new enough libthread.so.
4062 guarantee(func != NULL, "libthread.so is too old.");
4063 }
4064
4065 int size;
4066 void (*handler_info_func)(address *, int *);
4067 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4068 handler_info_func(&handler_start, &size);
4069 handler_end = handler_start + size;
4070 }
4071
4072
4073 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4074 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4075 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4076 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4077 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4078 int os::Solaris::_mutex_scope = USYNC_THREAD;
4079
4080 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4081 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4082 int_fnP_cond_tP os::Solaris::_cond_signal;
4083 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4084 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4085 int_fnP_cond_tP os::Solaris::_cond_destroy;
4086 int os::Solaris::_cond_scope = USYNC_THREAD;
4087 bool os::Solaris::_synchronization_initialized;
4088
4089 void os::Solaris::synchronization_init() {
4090 if (UseLWPSynchronization) {
4091 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4092 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4093 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4094 os::Solaris::set_mutex_init(lwp_mutex_init);
4095 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4096 os::Solaris::set_mutex_scope(USYNC_THREAD);
4097
4098 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4099 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4100 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4101 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4102 os::Solaris::set_cond_init(lwp_cond_init);
4103 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4104 os::Solaris::set_cond_scope(USYNC_THREAD);
4105 } else {
4106 os::Solaris::set_mutex_scope(USYNC_THREAD);
4107 os::Solaris::set_cond_scope(USYNC_THREAD);
4108
4109 if (UsePthreads) {
4110 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4111 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4112 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4113 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4114 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4115
4116 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4117 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4118 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4119 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4120 os::Solaris::set_cond_init(pthread_cond_default_init);
4121 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4122 } else {
4123 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4124 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4125 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4126 os::Solaris::set_mutex_init(::mutex_init);
4127 os::Solaris::set_mutex_destroy(::mutex_destroy);
4128
4129 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4130 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4131 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4132 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4133 os::Solaris::set_cond_init(::cond_init);
4134 os::Solaris::set_cond_destroy(::cond_destroy);
4135 }
4136 }
4137 _synchronization_initialized = true;
4138 }
4139
4140 bool os::Solaris::liblgrp_init() {
4141 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4142 if (handle != NULL) {
4143 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4144 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4145 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4146 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4147 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4148 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4149 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4150 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4151 dlsym(handle, "lgrp_cookie_stale")));
4152
4153 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4154 set_lgrp_cookie(c);
4155 return true;
4156 }
4157 return false;
4158 }
4159
4160 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4161 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4162 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4163
4164 void init_pset_getloadavg_ptr(void) {
4165 pset_getloadavg_ptr =
4166 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4167 if (pset_getloadavg_ptr == NULL) {
4168 log_warning(os)("pset_getloadavg function not found");
4169 }
4170 }
4171
4172 int os::Solaris::_dev_zero_fd = -1;
4173
4174 // this is called _before_ the global arguments have been parsed
4175 void os::init(void) {
4176 _initial_pid = getpid();
4177
4178 max_hrtime = first_hrtime = gethrtime();
4179
4180 init_random(1234567);
4181
4182 page_size = sysconf(_SC_PAGESIZE);
4183 if (page_size == -1) {
4184 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4185 }
4186 init_page_sizes((size_t) page_size);
4187
4188 Solaris::initialize_system_info();
4189
4190 int fd = ::open("/dev/zero", O_RDWR);
4191 if (fd < 0) {
4192 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4193 } else {
4194 Solaris::set_dev_zero_fd(fd);
4195
4196 // Close on exec, child won't inherit.
4197 fcntl(fd, F_SETFD, FD_CLOEXEC);
4198 }
4199
4200 clock_tics_per_sec = CLK_TCK;
4201
4202 // check if dladdr1() exists; dladdr1 can provide more information than
4203 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4204 // and is available on linker patches for 5.7 and 5.8.
4205 // libdl.so must have been loaded, this call is just an entry lookup
4206 void * hdl = dlopen("libdl.so", RTLD_NOW);
4207 if (hdl) {
4208 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4209 }
4210
4211 main_thread = thr_self();
4212
4213 // dynamic lookup of functions that may not be available in our lowest
4214 // supported Solaris release
4215 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4216 if (handle != NULL) {
4217 Solaris::_pthread_setname_np = // from 11.3
4218 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4219 }
4220 }
4221
4222 // To install functions for atexit system call
4223 extern "C" {
4224 static void perfMemory_exit_helper() {
4225 perfMemory_exit();
4226 }
4227 }
4228
4229 // this is called _after_ the global arguments have been parsed
4230 jint os::init_2(void) {
4231 // try to enable extended file IO ASAP, see 6431278
4232 os::Solaris::try_enable_extended_io();
4233
4234 // Allocate a single page and mark it as readable for safepoint polling. Also
4235 // use this first mmap call to check support for MAP_ALIGN.
4236 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4237 page_size,
4238 MAP_PRIVATE | MAP_ALIGN,
4239 PROT_READ);
4240 if (polling_page == NULL) {
4241 has_map_align = false;
4242 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4243 PROT_READ);
4244 }
4245
4246 os::set_polling_page(polling_page);
4247 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4248
4249 if (!UseMembar) {
4250 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4251 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4252 os::set_memory_serialize_page(mem_serialize_page);
4253 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4254 }
4255
4256 // Check and sets minimum stack sizes against command line options
4257 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4258 return JNI_ERR;
4259 }
4260
4261 Solaris::libthread_init();
4262
4263 if (UseNUMA) {
4264 if (!Solaris::liblgrp_init()) {
4265 UseNUMA = false;
4266 } else {
4267 size_t lgrp_limit = os::numa_get_groups_num();
4268 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4269 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4270 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4271 if (lgrp_num < 2) {
4272 // There's only one locality group, disable NUMA.
4273 UseNUMA = false;
4274 }
4275 }
4276 if (!UseNUMA && ForceNUMA) {
4277 UseNUMA = true;
4278 }
4279 }
4280
4281 Solaris::signal_sets_init();
4282 Solaris::init_signal_mem();
4283 Solaris::install_signal_handlers();
4284
4285 // initialize synchronization primitives to use either thread or
4286 // lwp synchronization (controlled by UseLWPSynchronization)
4287 Solaris::synchronization_init();
4288
4289 if (MaxFDLimit) {
4290 // set the number of file descriptors to max. print out error
4291 // if getrlimit/setrlimit fails but continue regardless.
4292 struct rlimit nbr_files;
4293 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4294 if (status != 0) {
4295 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4296 } else {
4297 nbr_files.rlim_cur = nbr_files.rlim_max;
4298 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4299 if (status != 0) {
4300 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4301 }
4302 }
4303 }
4304
4305 // Calculate theoretical max. size of Threads to guard gainst
4306 // artifical out-of-memory situations, where all available address-
4307 // space has been reserved by thread stacks. Default stack size is 1Mb.
4308 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4309 JavaThread::stack_size_at_create() : (1*K*K);
4310 assert(pre_thread_stack_size != 0, "Must have a stack");
4311 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4312 // we should start doing Virtual Memory banging. Currently when the threads will
4313 // have used all but 200Mb of space.
4314 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4315 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4316
4317 // at-exit methods are called in the reverse order of their registration.
4318 // In Solaris 7 and earlier, atexit functions are called on return from
4319 // main or as a result of a call to exit(3C). There can be only 32 of
4320 // these functions registered and atexit() does not set errno. In Solaris
4321 // 8 and later, there is no limit to the number of functions registered
4322 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4323 // functions are called upon dlclose(3DL) in addition to return from main
4324 // and exit(3C).
4325
4326 if (PerfAllowAtExitRegistration) {
4327 // only register atexit functions if PerfAllowAtExitRegistration is set.
4328 // atexit functions can be delayed until process exit time, which
4329 // can be problematic for embedded VM situations. Embedded VMs should
4330 // call DestroyJavaVM() to assure that VM resources are released.
4331
4332 // note: perfMemory_exit_helper atexit function may be removed in
4333 // the future if the appropriate cleanup code can be added to the
4334 // VM_Exit VMOperation's doit method.
4335 if (atexit(perfMemory_exit_helper) != 0) {
4336 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4337 }
4338 }
4339
4340 // Init pset_loadavg function pointer
4341 init_pset_getloadavg_ptr();
4342
4343 return JNI_OK;
4344 }
4345
4346 // Mark the polling page as unreadable
4347 void os::make_polling_page_unreadable(void) {
4348 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4349 fatal("Could not disable polling page");
4350 }
4351 }
4352
4353 // Mark the polling page as readable
4354 void os::make_polling_page_readable(void) {
4355 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4356 fatal("Could not enable polling page");
4357 }
4358 }
4359
4360 // Is a (classpath) directory empty?
4361 bool os::dir_is_empty(const char* path) {
4362 DIR *dir = NULL;
4363 struct dirent *ptr;
4364
4365 dir = opendir(path);
4366 if (dir == NULL) return true;
4367
4368 // Scan the directory
4369 bool result = true;
4370 char buf[sizeof(struct dirent) + MAX_PATH];
4371 struct dirent *dbuf = (struct dirent *) buf;
4372 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4373 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4374 result = false;
4375 }
4376 }
4377 closedir(dir);
4378 return result;
4379 }
4380
4381 // This code originates from JDK's sysOpen and open64_w
4382 // from src/solaris/hpi/src/system_md.c
4383
4384 int os::open(const char *path, int oflag, int mode) {
4385 if (strlen(path) > MAX_PATH - 1) {
4386 errno = ENAMETOOLONG;
4387 return -1;
4388 }
4389 int fd;
4390
4391 fd = ::open64(path, oflag, mode);
4392 if (fd == -1) return -1;
4393
4394 // If the open succeeded, the file might still be a directory
4395 {
4396 struct stat64 buf64;
4397 int ret = ::fstat64(fd, &buf64);
4398 int st_mode = buf64.st_mode;
4399
4400 if (ret != -1) {
4401 if ((st_mode & S_IFMT) == S_IFDIR) {
4402 errno = EISDIR;
4403 ::close(fd);
4404 return -1;
4405 }
4406 } else {
4407 ::close(fd);
4408 return -1;
4409 }
4410 }
4411
4412 // 32-bit Solaris systems suffer from:
4413 //
4414 // - an historical default soft limit of 256 per-process file
4415 // descriptors that is too low for many Java programs.
4416 //
4417 // - a design flaw where file descriptors created using stdio
4418 // fopen must be less than 256, _even_ when the first limit above
4419 // has been raised. This can cause calls to fopen (but not calls to
4420 // open, for example) to fail mysteriously, perhaps in 3rd party
4421 // native code (although the JDK itself uses fopen). One can hardly
4422 // criticize them for using this most standard of all functions.
4423 //
4424 // We attempt to make everything work anyways by:
4425 //
4426 // - raising the soft limit on per-process file descriptors beyond
4427 // 256
4428 //
4429 // - As of Solaris 10u4, we can request that Solaris raise the 256
4430 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4431 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4432 //
4433 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4434 // workaround the bug by remapping non-stdio file descriptors below
4435 // 256 to ones beyond 256, which is done below.
4436 //
4437 // See:
4438 // 1085341: 32-bit stdio routines should support file descriptors >255
4439 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4440 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4441 // enable_extended_FILE_stdio() in VM initialisation
4442 // Giri Mandalika's blog
4443 // http://technopark02.blogspot.com/2005_05_01_archive.html
4444 //
4445 #ifndef _LP64
4446 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4447 int newfd = ::fcntl(fd, F_DUPFD, 256);
4448 if (newfd != -1) {
4449 ::close(fd);
4450 fd = newfd;
4451 }
4452 }
4453 #endif // 32-bit Solaris
4454
4455 // All file descriptors that are opened in the JVM and not
4456 // specifically destined for a subprocess should have the
4457 // close-on-exec flag set. If we don't set it, then careless 3rd
4458 // party native code might fork and exec without closing all
4459 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4460 // UNIXProcess.c), and this in turn might:
4461 //
4462 // - cause end-of-file to fail to be detected on some file
4463 // descriptors, resulting in mysterious hangs, or
4464 //
4465 // - might cause an fopen in the subprocess to fail on a system
4466 // suffering from bug 1085341.
4467 //
4468 // (Yes, the default setting of the close-on-exec flag is a Unix
4469 // design flaw)
4470 //
4471 // See:
4472 // 1085341: 32-bit stdio routines should support file descriptors >255
4473 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4474 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4475 //
4476 #ifdef FD_CLOEXEC
4477 {
4478 int flags = ::fcntl(fd, F_GETFD);
4479 if (flags != -1) {
4480 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4481 }
4482 }
4483 #endif
4484
4485 return fd;
4486 }
4487
4488 // create binary file, rewriting existing file if required
4489 int os::create_binary_file(const char* path, bool rewrite_existing) {
4490 int oflags = O_WRONLY | O_CREAT;
4491 if (!rewrite_existing) {
4492 oflags |= O_EXCL;
4493 }
4494 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4495 }
4496
4497 // return current position of file pointer
4498 jlong os::current_file_offset(int fd) {
4499 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4500 }
4501
4502 // move file pointer to the specified offset
4503 jlong os::seek_to_file_offset(int fd, jlong offset) {
4504 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4505 }
4506
4507 jlong os::lseek(int fd, jlong offset, int whence) {
4508 return (jlong) ::lseek64(fd, offset, whence);
4509 }
4510
4511 char * os::native_path(char *path) {
4512 return path;
4513 }
4514
4515 int os::ftruncate(int fd, jlong length) {
4516 return ::ftruncate64(fd, length);
4517 }
4518
4519 int os::fsync(int fd) {
4520 RESTARTABLE_RETURN_INT(::fsync(fd));
4521 }
4522
4523 int os::available(int fd, jlong *bytes) {
4524 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4525 "Assumed _thread_in_native");
4526 jlong cur, end;
4527 int mode;
4528 struct stat64 buf64;
4529
4530 if (::fstat64(fd, &buf64) >= 0) {
4531 mode = buf64.st_mode;
4532 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4533 int n,ioctl_return;
4534
4535 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4536 if (ioctl_return>= 0) {
4537 *bytes = n;
4538 return 1;
4539 }
4540 }
4541 }
4542 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4543 return 0;
4544 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4545 return 0;
4546 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4547 return 0;
4548 }
4549 *bytes = end - cur;
4550 return 1;
4551 }
4552
4553 // Map a block of memory.
4554 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4555 char *addr, size_t bytes, bool read_only,
4556 bool allow_exec) {
4557 int prot;
4558 int flags;
4559
4560 if (read_only) {
4561 prot = PROT_READ;
4562 flags = MAP_SHARED;
4563 } else {
4564 prot = PROT_READ | PROT_WRITE;
4565 flags = MAP_PRIVATE;
4566 }
4567
4568 if (allow_exec) {
4569 prot |= PROT_EXEC;
4570 }
4571
4572 if (addr != NULL) {
4573 flags |= MAP_FIXED;
4574 }
4575
4576 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4577 fd, file_offset);
4578 if (mapped_address == MAP_FAILED) {
4579 return NULL;
4580 }
4581 return mapped_address;
4582 }
4583
4584
4585 // Remap a block of memory.
4586 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4587 char *addr, size_t bytes, bool read_only,
4588 bool allow_exec) {
4589 // same as map_memory() on this OS
4590 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4591 allow_exec);
4592 }
4593
4594
4595 // Unmap a block of memory.
4596 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4597 return munmap(addr, bytes) == 0;
4598 }
4599
4600 void os::pause() {
4601 char filename[MAX_PATH];
4602 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4603 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4604 } else {
4605 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4606 }
4607
4608 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4609 if (fd != -1) {
4610 struct stat buf;
4611 ::close(fd);
4612 while (::stat(filename, &buf) == 0) {
4613 (void)::poll(NULL, 0, 100);
4614 }
4615 } else {
4616 jio_fprintf(stderr,
4617 "Could not open pause file '%s', continuing immediately.\n", filename);
4618 }
4619 }
4620
4621 #ifndef PRODUCT
4622 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4623 // Turn this on if you need to trace synch operations.
4624 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4625 // and call record_synch_enable and record_synch_disable
4626 // around the computation of interest.
4627
4628 void record_synch(char* name, bool returning); // defined below
4629
4630 class RecordSynch {
4631 char* _name;
4632 public:
4633 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4634 ~RecordSynch() { record_synch(_name, true); }
4635 };
4636
4637 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4638 extern "C" ret name params { \
4639 typedef ret name##_t params; \
4640 static name##_t* implem = NULL; \
4641 static int callcount = 0; \
4642 if (implem == NULL) { \
4643 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4644 if (implem == NULL) fatal(dlerror()); \
4645 } \
4646 ++callcount; \
4647 RecordSynch _rs(#name); \
4648 inner; \
4649 return implem args; \
4650 }
4651 // in dbx, examine callcounts this way:
4652 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4653
4654 #define CHECK_POINTER_OK(p) \
4655 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4656 #define CHECK_MU \
4657 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4658 #define CHECK_CV \
4659 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4660 #define CHECK_P(p) \
4661 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4662
4663 #define CHECK_MUTEX(mutex_op) \
4664 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4665
4666 CHECK_MUTEX( mutex_lock)
4667 CHECK_MUTEX( _mutex_lock)
4668 CHECK_MUTEX( mutex_unlock)
4669 CHECK_MUTEX(_mutex_unlock)
4670 CHECK_MUTEX( mutex_trylock)
4671 CHECK_MUTEX(_mutex_trylock)
4672
4673 #define CHECK_COND(cond_op) \
4674 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4675
4676 CHECK_COND( cond_wait);
4677 CHECK_COND(_cond_wait);
4678 CHECK_COND(_cond_wait_cancel);
4679
4680 #define CHECK_COND2(cond_op) \
4681 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4682
4683 CHECK_COND2( cond_timedwait);
4684 CHECK_COND2(_cond_timedwait);
4685 CHECK_COND2(_cond_timedwait_cancel);
4686
4687 // do the _lwp_* versions too
4688 #define mutex_t lwp_mutex_t
4689 #define cond_t lwp_cond_t
4690 CHECK_MUTEX( _lwp_mutex_lock)
4691 CHECK_MUTEX( _lwp_mutex_unlock)
4692 CHECK_MUTEX( _lwp_mutex_trylock)
4693 CHECK_MUTEX( __lwp_mutex_lock)
4694 CHECK_MUTEX( __lwp_mutex_unlock)
4695 CHECK_MUTEX( __lwp_mutex_trylock)
4696 CHECK_MUTEX(___lwp_mutex_lock)
4697 CHECK_MUTEX(___lwp_mutex_unlock)
4698
4699 CHECK_COND( _lwp_cond_wait);
4700 CHECK_COND( __lwp_cond_wait);
4701 CHECK_COND(___lwp_cond_wait);
4702
4703 CHECK_COND2( _lwp_cond_timedwait);
4704 CHECK_COND2( __lwp_cond_timedwait);
4705 #undef mutex_t
4706 #undef cond_t
4707
4708 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4709 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4710 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4711 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4712 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4713 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4714 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4715 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4716
4717
4718 // recording machinery:
4719
4720 enum { RECORD_SYNCH_LIMIT = 200 };
4721 char* record_synch_name[RECORD_SYNCH_LIMIT];
4722 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4723 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4724 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4725 int record_synch_count = 0;
4726 bool record_synch_enabled = false;
4727
4728 // in dbx, examine recorded data this way:
4729 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4730
4731 void record_synch(char* name, bool returning) {
4732 if (record_synch_enabled) {
4733 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4734 record_synch_name[record_synch_count] = name;
4735 record_synch_returning[record_synch_count] = returning;
4736 record_synch_thread[record_synch_count] = thr_self();
4737 record_synch_arg0ptr[record_synch_count] = &name;
4738 record_synch_count++;
4739 }
4740 // put more checking code here:
4741 // ...
4742 }
4743 }
4744
4745 void record_synch_enable() {
4746 // start collecting trace data, if not already doing so
4747 if (!record_synch_enabled) record_synch_count = 0;
4748 record_synch_enabled = true;
4749 }
4750
4751 void record_synch_disable() {
4752 // stop collecting trace data
4753 record_synch_enabled = false;
4754 }
4755
4756 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4757 #endif // PRODUCT
4758
4759 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4760 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4761 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4762
4763
4764 // JVMTI & JVM monitoring and management support
4765 // The thread_cpu_time() and current_thread_cpu_time() are only
4766 // supported if is_thread_cpu_time_supported() returns true.
4767 // They are not supported on Solaris T1.
4768
4769 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4770 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4771 // of a thread.
4772 //
4773 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4774 // returns the fast estimate available on the platform.
4775
4776 // hrtime_t gethrvtime() return value includes
4777 // user time but does not include system time
4778 jlong os::current_thread_cpu_time() {
4779 return (jlong) gethrvtime();
4780 }
4781
4782 jlong os::thread_cpu_time(Thread *thread) {
4783 // return user level CPU time only to be consistent with
4784 // what current_thread_cpu_time returns.
4785 // thread_cpu_time_info() must be changed if this changes
4786 return os::thread_cpu_time(thread, false /* user time only */);
4787 }
4788
4789 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4790 if (user_sys_cpu_time) {
4791 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4792 } else {
4793 return os::current_thread_cpu_time();
4794 }
4795 }
4796
4797 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4798 char proc_name[64];
4799 int count;
4800 prusage_t prusage;
4801 jlong lwp_time;
4802 int fd;
4803
4804 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4805 getpid(),
4806 thread->osthread()->lwp_id());
4807 fd = ::open(proc_name, O_RDONLY);
4808 if (fd == -1) return -1;
4809
4810 do {
4811 count = ::pread(fd,
4812 (void *)&prusage.pr_utime,
4813 thr_time_size,
4814 thr_time_off);
4815 } while (count < 0 && errno == EINTR);
4816 ::close(fd);
4817 if (count < 0) return -1;
4818
4819 if (user_sys_cpu_time) {
4820 // user + system CPU time
4821 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4822 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4823 (jlong)prusage.pr_stime.tv_nsec +
4824 (jlong)prusage.pr_utime.tv_nsec;
4825 } else {
4826 // user level CPU time only
4827 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4828 (jlong)prusage.pr_utime.tv_nsec;
4829 }
4830
4831 return (lwp_time);
4832 }
4833
4834 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4835 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4836 info_ptr->may_skip_backward = false; // elapsed time not wall time
4837 info_ptr->may_skip_forward = false; // elapsed time not wall time
4838 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4839 }
4840
4841 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4842 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4843 info_ptr->may_skip_backward = false; // elapsed time not wall time
4844 info_ptr->may_skip_forward = false; // elapsed time not wall time
4845 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4846 }
4847
4848 bool os::is_thread_cpu_time_supported() {
4849 return true;
4850 }
4851
4852 // System loadavg support. Returns -1 if load average cannot be obtained.
4853 // Return the load average for our processor set if the primitive exists
4854 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4855 int os::loadavg(double loadavg[], int nelem) {
4856 if (pset_getloadavg_ptr != NULL) {
4857 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4858 } else {
4859 return ::getloadavg(loadavg, nelem);
4860 }
4861 }
4862
4863 //---------------------------------------------------------------------------------
4864
4865 bool os::find(address addr, outputStream* st) {
4866 Dl_info dlinfo;
4867 memset(&dlinfo, 0, sizeof(dlinfo));
4868 if (dladdr(addr, &dlinfo) != 0) {
4869 st->print(PTR_FORMAT ": ", addr);
4870 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4871 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4872 } else if (dlinfo.dli_fbase != NULL) {
4873 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4874 } else {
4875 st->print("<absolute address>");
4876 }
4877 if (dlinfo.dli_fname != NULL) {
4878 st->print(" in %s", dlinfo.dli_fname);
4879 }
4880 if (dlinfo.dli_fbase != NULL) {
4881 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4882 }
4883 st->cr();
4884
4885 if (Verbose) {
4886 // decode some bytes around the PC
4887 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4888 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4889 address lowest = (address) dlinfo.dli_sname;
4890 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4891 if (begin < lowest) begin = lowest;
4892 Dl_info dlinfo2;
4893 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4894 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4895 end = (address) dlinfo2.dli_saddr;
4896 }
4897 Disassembler::decode(begin, end, st);
4898 }
4899 return true;
4900 }
4901 return false;
4902 }
4903
4904 // Following function has been added to support HotSparc's libjvm.so running
4905 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4906 // src/solaris/hpi/native_threads in the EVM codebase.
4907 //
4908 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4909 // libraries and should thus be removed. We will leave it behind for a while
4910 // until we no longer want to able to run on top of 1.3.0 Solaris production
4911 // JDK. See 4341971.
4912
4913 #define STACK_SLACK 0x800
4914
4915 extern "C" {
4916 intptr_t sysThreadAvailableStackWithSlack() {
4917 stack_t st;
4918 intptr_t retval, stack_top;
4919 retval = thr_stksegment(&st);
4920 assert(retval == 0, "incorrect return value from thr_stksegment");
4921 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4922 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4923 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4924 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4925 }
4926 }
4927
4928 // ObjectMonitor park-unpark infrastructure ...
4929 //
4930 // We implement Solaris and Linux PlatformEvents with the
4931 // obvious condvar-mutex-flag triple.
4932 // Another alternative that works quite well is pipes:
4933 // Each PlatformEvent consists of a pipe-pair.
4934 // The thread associated with the PlatformEvent
4935 // calls park(), which reads from the input end of the pipe.
4936 // Unpark() writes into the other end of the pipe.
4937 // The write-side of the pipe must be set NDELAY.
4938 // Unfortunately pipes consume a large # of handles.
4939 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4940 // Using pipes for the 1st few threads might be workable, however.
4941 //
4942 // park() is permitted to return spuriously.
4943 // Callers of park() should wrap the call to park() in
4944 // an appropriate loop. A litmus test for the correct
4945 // usage of park is the following: if park() were modified
4946 // to immediately return 0 your code should still work,
4947 // albeit degenerating to a spin loop.
4948 //
4949 // In a sense, park()-unpark() just provides more polite spinning
4950 // and polling with the key difference over naive spinning being
4951 // that a parked thread needs to be explicitly unparked() in order
4952 // to wake up and to poll the underlying condition.
4953 //
4954 // Assumption:
4955 // Only one parker can exist on an event, which is why we allocate
4956 // them per-thread. Multiple unparkers can coexist.
4957 //
4958 // _Event transitions in park()
4959 // -1 => -1 : illegal
4960 // 1 => 0 : pass - return immediately
4961 // 0 => -1 : block; then set _Event to 0 before returning
4962 //
4963 // _Event transitions in unpark()
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 //
4970 // _Event serves as a restricted-range semaphore.
4971 // -1 : thread is blocked, i.e. there is a waiter
4972 // 0 : neutral: thread is running or ready,
4973 // could have been signaled after a wait started
4974 // 1 : signaled - thread is running or ready
4975 //
4976 // Another possible encoding of _Event would be with
4977 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4978 //
4979 // TODO-FIXME: add DTRACE probes for:
4980 // 1. Tx parks
4981 // 2. Ty unparks Tx
4982 // 3. Tx resumes from park
4983
4984
4985 // value determined through experimentation
4986 #define ROUNDINGFIX 11
4987
4988 // utility to compute the abstime argument to timedwait.
4989 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4990
4991 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4992 // millis is the relative timeout time
4993 // abstime will be the absolute timeout time
4994 if (millis < 0) millis = 0;
4995 struct timeval now;
4996 int status = gettimeofday(&now, NULL);
4997 assert(status == 0, "gettimeofday");
4998 jlong seconds = millis / 1000;
4999 jlong max_wait_period;
5000
5001 if (UseLWPSynchronization) {
5002 // forward port of fix for 4275818 (not sleeping long enough)
5003 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5004 // _lwp_cond_timedwait() used a round_down algorithm rather
5005 // than a round_up. For millis less than our roundfactor
5006 // it rounded down to 0 which doesn't meet the spec.
5007 // For millis > roundfactor we may return a bit sooner, but
5008 // since we can not accurately identify the patch level and
5009 // this has already been fixed in Solaris 9 and 8 we will
5010 // leave it alone rather than always rounding down.
5011
5012 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5013 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5014 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5015 max_wait_period = 21000000;
5016 } else {
5017 max_wait_period = 50000000;
5018 }
5019 millis %= 1000;
5020 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5021 seconds = max_wait_period;
5022 }
5023 abstime->tv_sec = now.tv_sec + seconds;
5024 long usec = now.tv_usec + millis * 1000;
5025 if (usec >= 1000000) {
5026 abstime->tv_sec += 1;
5027 usec -= 1000000;
5028 }
5029 abstime->tv_nsec = usec * 1000;
5030 return abstime;
5031 }
5032
5033 void os::PlatformEvent::park() { // AKA: down()
5034 // Transitions for _Event:
5035 // -1 => -1 : illegal
5036 // 1 => 0 : pass - return immediately
5037 // 0 => -1 : block; then set _Event to 0 before returning
5038
5039 // Invariant: Only the thread associated with the Event/PlatformEvent
5040 // may call park().
5041 assert(_nParked == 0, "invariant");
5042
5043 int v;
5044 for (;;) {
5045 v = _Event;
5046 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5047 }
5048 guarantee(v >= 0, "invariant");
5049 if (v == 0) {
5050 // Do this the hard way by blocking ...
5051 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5052 int status = os::Solaris::mutex_lock(_mutex);
5053 assert_status(status == 0, status, "mutex_lock");
5054 guarantee(_nParked == 0, "invariant");
5055 ++_nParked;
5056 while (_Event < 0) {
5057 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5058 // Treat this the same as if the wait was interrupted
5059 // With usr/lib/lwp going to kernel, always handle ETIME
5060 status = os::Solaris::cond_wait(_cond, _mutex);
5061 if (status == ETIME) status = EINTR;
5062 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5063 }
5064 --_nParked;
5065 _Event = 0;
5066 status = os::Solaris::mutex_unlock(_mutex);
5067 assert_status(status == 0, status, "mutex_unlock");
5068 // Paranoia to ensure our locked and lock-free paths interact
5069 // correctly with each other.
5070 OrderAccess::fence();
5071 }
5072 }
5073
5074 int os::PlatformEvent::park(jlong millis) {
5075 // Transitions for _Event:
5076 // -1 => -1 : illegal
5077 // 1 => 0 : pass - return immediately
5078 // 0 => -1 : block; then set _Event to 0 before returning
5079
5080 guarantee(_nParked == 0, "invariant");
5081 int v;
5082 for (;;) {
5083 v = _Event;
5084 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5085 }
5086 guarantee(v >= 0, "invariant");
5087 if (v != 0) return OS_OK;
5088
5089 int ret = OS_TIMEOUT;
5090 timestruc_t abst;
5091 compute_abstime(&abst, millis);
5092
5093 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5094 int status = os::Solaris::mutex_lock(_mutex);
5095 assert_status(status == 0, status, "mutex_lock");
5096 guarantee(_nParked == 0, "invariant");
5097 ++_nParked;
5098 while (_Event < 0) {
5099 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5100 assert_status(status == 0 || status == EINTR ||
5101 status == ETIME || status == ETIMEDOUT,
5102 status, "cond_timedwait");
5103 if (!FilterSpuriousWakeups) break; // previous semantics
5104 if (status == ETIME || status == ETIMEDOUT) break;
5105 // We consume and ignore EINTR and spurious wakeups.
5106 }
5107 --_nParked;
5108 if (_Event >= 0) ret = OS_OK;
5109 _Event = 0;
5110 status = os::Solaris::mutex_unlock(_mutex);
5111 assert_status(status == 0, status, "mutex_unlock");
5112 // Paranoia to ensure our locked and lock-free paths interact
5113 // correctly with each other.
5114 OrderAccess::fence();
5115 return ret;
5116 }
5117
5118 void os::PlatformEvent::unpark() {
5119 // Transitions for _Event:
5120 // 0 => 1 : just return
5121 // 1 => 1 : just return
5122 // -1 => either 0 or 1; must signal target thread
5123 // That is, we can safely transition _Event from -1 to either
5124 // 0 or 1.
5125 // See also: "Semaphores in Plan 9" by Mullender & Cox
5126 //
5127 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5128 // that it will take two back-to-back park() calls for the owning
5129 // thread to block. This has the benefit of forcing a spurious return
5130 // from the first park() call after an unpark() call which will help
5131 // shake out uses of park() and unpark() without condition variables.
5132
5133 if (Atomic::xchg(1, &_Event) >= 0) return;
5134
5135 // If the thread associated with the event was parked, wake it.
5136 // Wait for the thread assoc with the PlatformEvent to vacate.
5137 int status = os::Solaris::mutex_lock(_mutex);
5138 assert_status(status == 0, status, "mutex_lock");
5139 int AnyWaiters = _nParked;
5140 status = os::Solaris::mutex_unlock(_mutex);
5141 assert_status(status == 0, status, "mutex_unlock");
5142 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5143 if (AnyWaiters != 0) {
5144 // Note that we signal() *after* dropping the lock for "immortal" Events.
5145 // This is safe and avoids a common class of futile wakeups. In rare
5146 // circumstances this can cause a thread to return prematurely from
5147 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5148 // will simply re-test the condition and re-park itself.
5149 // This provides particular benefit if the underlying platform does not
5150 // provide wait morphing.
5151 status = os::Solaris::cond_signal(_cond);
5152 assert_status(status == 0, status, "cond_signal");
5153 }
5154 }
5155
5156 // JSR166
5157 // -------------------------------------------------------
5158
5159 // The solaris and linux implementations of park/unpark are fairly
5160 // conservative for now, but can be improved. They currently use a
5161 // mutex/condvar pair, plus _counter.
5162 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5163 // sets count to 1 and signals condvar. Only one thread ever waits
5164 // on the condvar. Contention seen when trying to park implies that someone
5165 // is unparking you, so don't wait. And spurious returns are fine, so there
5166 // is no need to track notifications.
5167
5168 #define MAX_SECS 100000000
5169
5170 // This code is common to linux and solaris and will be moved to a
5171 // common place in dolphin.
5172 //
5173 // The passed in time value is either a relative time in nanoseconds
5174 // or an absolute time in milliseconds. Either way it has to be unpacked
5175 // into suitable seconds and nanoseconds components and stored in the
5176 // given timespec structure.
5177 // Given time is a 64-bit value and the time_t used in the timespec is only
5178 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5179 // overflow if times way in the future are given. Further on Solaris versions
5180 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5181 // number of seconds, in abstime, is less than current_time + 100,000,000.
5182 // As it will be 28 years before "now + 100000000" will overflow we can
5183 // ignore overflow and just impose a hard-limit on seconds using the value
5184 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5185 // years from "now".
5186 //
5187 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5188 assert(time > 0, "convertTime");
5189
5190 struct timeval now;
5191 int status = gettimeofday(&now, NULL);
5192 assert(status == 0, "gettimeofday");
5193
5194 time_t max_secs = now.tv_sec + MAX_SECS;
5195
5196 if (isAbsolute) {
5197 jlong secs = time / 1000;
5198 if (secs > max_secs) {
5199 absTime->tv_sec = max_secs;
5200 } else {
5201 absTime->tv_sec = secs;
5202 }
5203 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5204 } else {
5205 jlong secs = time / NANOSECS_PER_SEC;
5206 if (secs >= MAX_SECS) {
5207 absTime->tv_sec = max_secs;
5208 absTime->tv_nsec = 0;
5209 } else {
5210 absTime->tv_sec = now.tv_sec + secs;
5211 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5212 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5213 absTime->tv_nsec -= NANOSECS_PER_SEC;
5214 ++absTime->tv_sec; // note: this must be <= max_secs
5215 }
5216 }
5217 }
5218 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5219 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5220 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5221 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5222 }
5223
5224 void Parker::park(bool isAbsolute, jlong time) {
5225 // Ideally we'd do something useful while spinning, such
5226 // as calling unpackTime().
5227
5228 // Optional fast-path check:
5229 // Return immediately if a permit is available.
5230 // We depend on Atomic::xchg() having full barrier semantics
5231 // since we are doing a lock-free update to _counter.
5232 if (Atomic::xchg(0, &_counter) > 0) return;
5233
5234 // Optional fast-exit: Check interrupt before trying to wait
5235 Thread* thread = Thread::current();
5236 assert(thread->is_Java_thread(), "Must be JavaThread");
5237 JavaThread *jt = (JavaThread *)thread;
5238 if (Thread::is_interrupted(thread, false)) {
5239 return;
5240 }
5241
5242 // First, demultiplex/decode time arguments
5243 timespec absTime;
5244 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5245 return;
5246 }
5247 if (time > 0) {
5248 // Warning: this code might be exposed to the old Solaris time
5249 // round-down bugs. Grep "roundingFix" for details.
5250 unpackTime(&absTime, isAbsolute, time);
5251 }
5252
5253 // Enter safepoint region
5254 // Beware of deadlocks such as 6317397.
5255 // The per-thread Parker:: _mutex is a classic leaf-lock.
5256 // In particular a thread must never block on the Threads_lock while
5257 // holding the Parker:: mutex. If safepoints are pending both the
5258 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5259 ThreadBlockInVM tbivm(jt);
5260
5261 // Don't wait if cannot get lock since interference arises from
5262 // unblocking. Also. check interrupt before trying wait
5263 if (Thread::is_interrupted(thread, false) ||
5264 os::Solaris::mutex_trylock(_mutex) != 0) {
5265 return;
5266 }
5267
5268 int status;
5269
5270 if (_counter > 0) { // no wait needed
5271 _counter = 0;
5272 status = os::Solaris::mutex_unlock(_mutex);
5273 assert(status == 0, "invariant");
5274 // Paranoia to ensure our locked and lock-free paths interact
5275 // correctly with each other and Java-level accesses.
5276 OrderAccess::fence();
5277 return;
5278 }
5279
5280 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5281 jt->set_suspend_equivalent();
5282 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5283
5284 // Do this the hard way by blocking ...
5285 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5286 if (time == 0) {
5287 status = os::Solaris::cond_wait(_cond, _mutex);
5288 } else {
5289 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5290 }
5291 // Note that an untimed cond_wait() can sometimes return ETIME on older
5292 // versions of the Solaris.
5293 assert_status(status == 0 || status == EINTR ||
5294 status == ETIME || status == ETIMEDOUT,
5295 status, "cond_timedwait");
5296
5297 _counter = 0;
5298 status = os::Solaris::mutex_unlock(_mutex);
5299 assert_status(status == 0, status, "mutex_unlock");
5300 // Paranoia to ensure our locked and lock-free paths interact
5301 // correctly with each other and Java-level accesses.
5302 OrderAccess::fence();
5303
5304 // If externally suspended while waiting, re-suspend
5305 if (jt->handle_special_suspend_equivalent_condition()) {
5306 jt->java_suspend_self();
5307 }
5308 }
5309
5310 void Parker::unpark() {
5311 int status = os::Solaris::mutex_lock(_mutex);
5312 assert(status == 0, "invariant");
5313 const int s = _counter;
5314 _counter = 1;
5315 status = os::Solaris::mutex_unlock(_mutex);
5316 assert(status == 0, "invariant");
5317
5318 if (s < 1) {
5319 status = os::Solaris::cond_signal(_cond);
5320 assert(status == 0, "invariant");
5321 }
5322 }
5323
5324 extern char** environ;
5325
5326 // Run the specified command in a separate process. Return its exit value,
5327 // or -1 on failure (e.g. can't fork a new process).
5328 // Unlike system(), this function can be called from signal handler. It
5329 // doesn't block SIGINT et al.
5330 int os::fork_and_exec(char* cmd) {
5331 char * argv[4];
5332 argv[0] = (char *)"sh";
5333 argv[1] = (char *)"-c";
5334 argv[2] = cmd;
5335 argv[3] = NULL;
5336
5337 // fork is async-safe, fork1 is not so can't use in signal handler
5338 pid_t pid;
5339 Thread* t = Thread::current_or_null_safe();
5340 if (t != NULL && t->is_inside_signal_handler()) {
5341 pid = fork();
5342 } else {
5343 pid = fork1();
5344 }
5345
5346 if (pid < 0) {
5347 // fork failed
5348 warning("fork failed: %s", os::strerror(errno));
5349 return -1;
5350
5351 } else if (pid == 0) {
5352 // child process
5353
5354 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5355 execve("/usr/bin/sh", argv, environ);
5356
5357 // execve failed
5358 _exit(-1);
5359
5360 } else {
5361 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5362 // care about the actual exit code, for now.
5363
5364 int status;
5365
5366 // Wait for the child process to exit. This returns immediately if
5367 // the child has already exited. */
5368 while (waitpid(pid, &status, 0) < 0) {
5369 switch (errno) {
5370 case ECHILD: return 0;
5371 case EINTR: break;
5372 default: return -1;
5373 }
5374 }
5375
5376 if (WIFEXITED(status)) {
5377 // The child exited normally; get its exit code.
5378 return WEXITSTATUS(status);
5379 } else if (WIFSIGNALED(status)) {
5380 // The child exited because of a signal
5381 // The best value to return is 0x80 + signal number,
5382 // because that is what all Unix shells do, and because
5383 // it allows callers to distinguish between process exit and
5384 // process death by signal.
5385 return 0x80 + WTERMSIG(status);
5386 } else {
5387 // Unknown exit code; pass it through
5388 return status;
5389 }
5390 }
5391 }
5392
5393 // is_headless_jre()
5394 //
5395 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5396 // in order to report if we are running in a headless jre
5397 //
5398 // Since JDK8 xawt/libmawt.so was moved into the same directory
5399 // as libawt.so, and renamed libawt_xawt.so
5400 //
5401 bool os::is_headless_jre() {
5402 struct stat statbuf;
5403 char buf[MAXPATHLEN];
5404 char libmawtpath[MAXPATHLEN];
5405 const char *xawtstr = "/xawt/libmawt.so";
5406 const char *new_xawtstr = "/libawt_xawt.so";
5407 char *p;
5408
5409 // Get path to libjvm.so
5410 os::jvm_path(buf, sizeof(buf));
5411
5412 // Get rid of libjvm.so
5413 p = strrchr(buf, '/');
5414 if (p == NULL) {
5415 return false;
5416 } else {
5417 *p = '\0';
5418 }
5419
5420 // Get rid of client or server
5421 p = strrchr(buf, '/');
5422 if (p == NULL) {
5423 return false;
5424 } else {
5425 *p = '\0';
5426 }
5427
5428 // check xawt/libmawt.so
5429 strcpy(libmawtpath, buf);
5430 strcat(libmawtpath, xawtstr);
5431 if (::stat(libmawtpath, &statbuf) == 0) return false;
5432
5433 // check libawt_xawt.so
5434 strcpy(libmawtpath, buf);
5435 strcat(libmawtpath, new_xawtstr);
5436 if (::stat(libmawtpath, &statbuf) == 0) return false;
5437
5438 return true;
5439 }
5440
5441 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5442 size_t res;
5443 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5444 return res;
5445 }
5446
5447 int os::close(int fd) {
5448 return ::close(fd);
5449 }
5450
5451 int os::socket_close(int fd) {
5452 return ::close(fd);
5453 }
5454
5455 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5456 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5457 "Assumed _thread_in_native");
5458 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5459 }
5460
5461 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5462 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5463 "Assumed _thread_in_native");
5464 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5465 }
5466
5467 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5468 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5469 }
5470
5471 // As both poll and select can be interrupted by signals, we have to be
5472 // prepared to restart the system call after updating the timeout, unless
5473 // a poll() is done with timeout == -1, in which case we repeat with this
5474 // "wait forever" value.
5475
5476 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5477 int _result;
5478 _result = ::connect(fd, him, len);
5479
5480 // On Solaris, when a connect() call is interrupted, the connection
5481 // can be established asynchronously (see 6343810). Subsequent calls
5482 // to connect() must check the errno value which has the semantic
5483 // described below (copied from the connect() man page). Handling
5484 // of asynchronously established connections is required for both
5485 // blocking and non-blocking sockets.
5486 // EINTR The connection attempt was interrupted
5487 // before any data arrived by the delivery of
5488 // a signal. The connection, however, will be
5489 // established asynchronously.
5490 //
5491 // EINPROGRESS The socket is non-blocking, and the connec-
5492 // tion cannot be completed immediately.
5493 //
5494 // EALREADY The socket is non-blocking, and a previous
5495 // connection attempt has not yet been com-
5496 // pleted.
5497 //
5498 // EISCONN The socket is already connected.
5499 if (_result == OS_ERR && errno == EINTR) {
5500 // restarting a connect() changes its errno semantics
5501 RESTARTABLE(::connect(fd, him, len), _result);
5502 // undo these changes
5503 if (_result == OS_ERR) {
5504 if (errno == EALREADY) {
5505 errno = EINPROGRESS; // fall through
5506 } else if (errno == EISCONN) {
5507 errno = 0;
5508 return OS_OK;
5509 }
5510 }
5511 }
5512 return _result;
5513 }
5514
5515 // Get the default path to the core file
5516 // Returns the length of the string
5517 int os::get_core_path(char* buffer, size_t bufferSize) {
5518 const char* p = get_current_directory(buffer, bufferSize);
5519
5520 if (p == NULL) {
5521 assert(p != NULL, "failed to get current directory");
5522 return 0;
5523 }
5524
5525 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5526 p, current_process_id());
5527
5528 return strlen(buffer);
5529 }
5530
5531 #ifndef PRODUCT
5532 void TestReserveMemorySpecial_test() {
5533 // No tests available for this platform
5534 }
5535 #endif
5536
5537 bool os::start_debugging(char *buf, int buflen) {
5538 int len = (int)strlen(buf);
5539 char *p = &buf[len];
5540
5541 jio_snprintf(p, buflen-len,
5542 "\n\n"
5543 "Do you want to debug the problem?\n\n"
5544 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5545 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5546 "Otherwise, press RETURN to abort...",
5547 os::current_process_id(), os::current_thread_id());
5548
5549 bool yes = os::message_box("Unexpected Error", buf);
5550
5551 if (yes) {
5552 // yes, user asked VM to launch debugger
5553 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5554
5555 os::fork_and_exec(buf);
5556 yes = false;
5557 }
5558 return yes;
5559 }