1 /*
2 * Copyright (c) 1997, 2014, 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 "memory/allocation.inline.hpp"
36 #include "memory/filemap.hpp"
37 #include "mutex_solaris.inline.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.inline.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 "services/attachListener.hpp"
64 #include "services/memTracker.hpp"
65 #include "services/runtimeService.hpp"
66 #include "utilities/decoder.hpp"
67 #include "utilities/defaultStream.hpp"
68 #include "utilities/events.hpp"
69 #include "utilities/growableArray.hpp"
70 #include "utilities/vmError.hpp"
71
72 // put OS-includes here
73 # include <dlfcn.h>
74 # include <errno.h>
75 # include <exception>
76 # include <link.h>
77 # include <poll.h>
78 # include <pthread.h>
79 # include <pwd.h>
80 # include <schedctl.h>
81 # include <setjmp.h>
82 # include <signal.h>
83 # include <stdio.h>
84 # include <alloca.h>
85 # include <sys/filio.h>
86 # include <sys/ipc.h>
87 # include <sys/lwp.h>
88 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
89 # include <sys/mman.h>
90 # include <sys/processor.h>
91 # include <sys/procset.h>
92 # include <sys/pset.h>
93 # include <sys/resource.h>
94 # include <sys/shm.h>
95 # include <sys/socket.h>
96 # include <sys/stat.h>
97 # include <sys/systeminfo.h>
98 # include <sys/time.h>
99 # include <sys/times.h>
100 # include <sys/types.h>
101 # include <sys/wait.h>
102 # include <sys/utsname.h>
103 # include <thread.h>
104 # include <unistd.h>
105 # include <sys/priocntl.h>
106 # include <sys/rtpriocntl.h>
107 # include <sys/tspriocntl.h>
108 # include <sys/iapriocntl.h>
109 # include <sys/fxpriocntl.h>
110 # include <sys/loadavg.h>
111 # include <string.h>
112 # include <stdio.h>
113
114 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
115 # include <sys/procfs.h> // see comment in <sys/procfs.h>
116
117 #define MAX_PATH (2 * K)
118
119 // for timer info max values which include all bits
120 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
121
122
123 // Here are some liblgrp types from sys/lgrp_user.h to be able to
124 // compile on older systems without this header file.
125
126 #ifndef MADV_ACCESS_LWP
127 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
128 #endif
129 #ifndef MADV_ACCESS_MANY
130 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */
131 #endif
132
133 #ifndef LGRP_RSRC_CPU
134 # define LGRP_RSRC_CPU 0 /* CPU resources */
135 #endif
136 #ifndef LGRP_RSRC_MEM
137 # define LGRP_RSRC_MEM 1 /* memory resources */
138 #endif
139
140 // see thr_setprio(3T) for the basis of these numbers
141 #define MinimumPriority 0
142 #define NormalPriority 64
143 #define MaximumPriority 127
144
145 // Values for ThreadPriorityPolicy == 1
146 int prio_policy1[CriticalPriority+1] = {
147 -99999, 0, 16, 32, 48, 64,
148 80, 96, 112, 124, 127, 127 };
149
150 // System parameters used internally
151 static clock_t clock_tics_per_sec = 100;
152
153 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
154 static bool enabled_extended_FILE_stdio = false;
155
156 // For diagnostics to print a message once. see run_periodic_checks
157 static bool check_addr0_done = false;
158 static sigset_t check_signal_done;
159 static bool check_signals = true;
160
161 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
162 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
163
164 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
165
166
167 // "default" initializers for missing libc APIs
168 extern "C" {
169 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
170 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
171
172 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
173 static int lwp_cond_destroy(cond_t *cv) { return 0; }
174 }
175
176 // "default" initializers for pthread-based synchronization
177 extern "C" {
178 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
179 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
180 }
181
182 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
183
184 // Thread Local Storage
185 // This is common to all Solaris platforms so it is defined here,
186 // in this common file.
187 // The declarations are in the os_cpu threadLS*.hpp files.
188 //
189 // Static member initialization for TLS
190 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL};
191
192 #ifndef PRODUCT
193 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d))
194
195 int ThreadLocalStorage::_tcacheHit = 0;
196 int ThreadLocalStorage::_tcacheMiss = 0;
197
198 void ThreadLocalStorage::print_statistics() {
199 int total = _tcacheMiss+_tcacheHit;
200 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n",
201 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total));
202 }
203 #undef _PCT
204 #endif // PRODUCT
205
206 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id,
207 int index) {
208 Thread *thread = get_thread_slow();
209 if (thread != NULL) {
210 address sp = os::current_stack_pointer();
211 guarantee(thread->_stack_base == NULL ||
212 (sp <= thread->_stack_base &&
213 sp >= thread->_stack_base - thread->_stack_size) ||
214 is_error_reported(),
215 "sp must be inside of selected thread stack");
216
217 thread->set_self_raw_id(raw_id); // mark for quick retrieval
218 _get_thread_cache[index] = thread;
219 }
220 return thread;
221 }
222
223
224 static const double all_zero[sizeof(Thread) / sizeof(double) + 1] = {0};
225 #define NO_CACHED_THREAD ((Thread*)all_zero)
226
227 void ThreadLocalStorage::pd_set_thread(Thread* thread) {
228
229 // Store the new value before updating the cache to prevent a race
230 // between get_thread_via_cache_slowly() and this store operation.
231 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread);
232
233 // Update thread cache with new thread if setting on thread create,
234 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit.
235 uintptr_t raw = pd_raw_thread_id();
236 int ix = pd_cache_index(raw);
237 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread;
238 }
239
240 void ThreadLocalStorage::pd_init() {
241 for (int i = 0; i < _pd_cache_size; i++) {
242 _get_thread_cache[i] = NO_CACHED_THREAD;
243 }
244 }
245
246 // Invalidate all the caches (happens to be the same as pd_init).
247 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); }
248
249 #undef NO_CACHED_THREAD
250
251 // END Thread Local Storage
252
253 static inline size_t adjust_stack_size(address base, size_t size) {
254 if ((ssize_t)size < 0) {
255 // 4759953: Compensate for ridiculous stack size.
256 size = max_intx;
257 }
258 if (size > (size_t)base) {
259 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
260 size = (size_t)base;
261 }
262 return size;
263 }
264
265 static inline stack_t get_stack_info() {
266 stack_t st;
267 int retval = thr_stksegment(&st);
268 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
269 assert(retval == 0, "incorrect return value from thr_stksegment");
270 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
271 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
272 return st;
273 }
274
275 address os::current_stack_base() {
276 int r = thr_main();
277 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
278 bool is_primordial_thread = r;
279
280 // Workaround 4352906, avoid calls to thr_stksegment by
281 // thr_main after the first one (it looks like we trash
282 // some data, causing the value for ss_sp to be incorrect).
283 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
284 stack_t st = get_stack_info();
285 if (is_primordial_thread) {
286 // cache initial value of stack base
287 os::Solaris::_main_stack_base = (address)st.ss_sp;
288 }
289 return (address)st.ss_sp;
290 } else {
291 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
292 return os::Solaris::_main_stack_base;
293 }
294 }
295
296 size_t os::current_stack_size() {
297 size_t size;
298
299 int r = thr_main();
300 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
301 if (!r) {
302 size = get_stack_info().ss_size;
303 } else {
304 struct rlimit limits;
305 getrlimit(RLIMIT_STACK, &limits);
306 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
307 }
308 // base may not be page aligned
309 address base = current_stack_base();
310 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
311 return (size_t)(base - bottom);
312 }
313
314 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
315 return localtime_r(clock, res);
316 }
317
318 void os::Solaris::try_enable_extended_io() {
319 typedef int (*enable_extended_FILE_stdio_t)(int, int);
320
321 if (!UseExtendedFileIO) {
322 return;
323 }
324
325 enable_extended_FILE_stdio_t enabler =
326 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
327 "enable_extended_FILE_stdio");
328 if (enabler) {
329 enabler(-1, -1);
330 }
331 }
332
333 static int _processors_online = 0;
334
335 jint os::Solaris::_os_thread_limit = 0;
336 volatile jint os::Solaris::_os_thread_count = 0;
337
338 julong os::available_memory() {
339 return Solaris::available_memory();
340 }
341
342 julong os::Solaris::available_memory() {
343 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
344 }
345
346 julong os::Solaris::_physical_memory = 0;
347
348 julong os::physical_memory() {
349 return Solaris::physical_memory();
350 }
351
352 static hrtime_t first_hrtime = 0;
353 static const hrtime_t hrtime_hz = 1000*1000*1000;
354 static volatile hrtime_t max_hrtime = 0;
355
356
357 void os::Solaris::initialize_system_info() {
358 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
359 _processors_online = sysconf (_SC_NPROCESSORS_ONLN);
360 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
361 }
362
363 int os::active_processor_count() {
364 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
365 pid_t pid = getpid();
366 psetid_t pset = PS_NONE;
367 // Are we running in a processor set or is there any processor set around?
368 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
369 uint_t pset_cpus;
370 // Query the number of cpus available to us.
371 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
372 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
373 _processors_online = pset_cpus;
374 return pset_cpus;
375 }
376 }
377 // Otherwise return number of online cpus
378 return online_cpus;
379 }
380
381 static bool find_processors_in_pset(psetid_t pset,
382 processorid_t** id_array,
383 uint_t* id_length) {
384 bool result = false;
385 // Find the number of processors in the processor set.
386 if (pset_info(pset, NULL, id_length, NULL) == 0) {
387 // Make up an array to hold their ids.
388 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
389 // Fill in the array with their processor ids.
390 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
391 result = true;
392 }
393 }
394 return result;
395 }
396
397 // Callers of find_processors_online() must tolerate imprecise results --
398 // the system configuration can change asynchronously because of DR
399 // or explicit psradm operations.
400 //
401 // We also need to take care that the loop (below) terminates as the
402 // number of processors online can change between the _SC_NPROCESSORS_ONLN
403 // request and the loop that builds the list of processor ids. Unfortunately
404 // there's no reliable way to determine the maximum valid processor id,
405 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
406 // man pages, which claim the processor id set is "sparse, but
407 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
408 // exit the loop.
409 //
410 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
411 // not available on S8.0.
412
413 static bool find_processors_online(processorid_t** id_array,
414 uint* id_length) {
415 const processorid_t MAX_PROCESSOR_ID = 100000;
416 // Find the number of processors online.
417 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
418 // Make up an array to hold their ids.
419 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
420 // Processors need not be numbered consecutively.
421 long found = 0;
422 processorid_t next = 0;
423 while (found < *id_length && next < MAX_PROCESSOR_ID) {
424 processor_info_t info;
425 if (processor_info(next, &info) == 0) {
426 // NB, PI_NOINTR processors are effectively online ...
427 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
428 (*id_array)[found] = next;
429 found += 1;
430 }
431 }
432 next += 1;
433 }
434 if (found < *id_length) {
435 // The loop above didn't identify the expected number of processors.
436 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
437 // and re-running the loop, above, but there's no guarantee of progress
438 // if the system configuration is in flux. Instead, we just return what
439 // we've got. Note that in the worst case find_processors_online() could
440 // return an empty set. (As a fall-back in the case of the empty set we
441 // could just return the ID of the current processor).
442 *id_length = found;
443 }
444
445 return true;
446 }
447
448 static bool assign_distribution(processorid_t* id_array,
449 uint id_length,
450 uint* distribution,
451 uint distribution_length) {
452 // We assume we can assign processorid_t's to uint's.
453 assert(sizeof(processorid_t) == sizeof(uint),
454 "can't convert processorid_t to uint");
455 // Quick check to see if we won't succeed.
456 if (id_length < distribution_length) {
457 return false;
458 }
459 // Assign processor ids to the distribution.
460 // Try to shuffle processors to distribute work across boards,
461 // assuming 4 processors per board.
462 const uint processors_per_board = ProcessDistributionStride;
463 // Find the maximum processor id.
464 processorid_t max_id = 0;
465 for (uint m = 0; m < id_length; m += 1) {
466 max_id = MAX2(max_id, id_array[m]);
467 }
468 // The next id, to limit loops.
469 const processorid_t limit_id = max_id + 1;
470 // Make up markers for available processors.
471 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
472 for (uint c = 0; c < limit_id; c += 1) {
473 available_id[c] = false;
474 }
475 for (uint a = 0; a < id_length; a += 1) {
476 available_id[id_array[a]] = true;
477 }
478 // Step by "boards", then by "slot", copying to "assigned".
479 // NEEDS_CLEANUP: The assignment of processors should be stateful,
480 // remembering which processors have been assigned by
481 // previous calls, etc., so as to distribute several
482 // independent calls of this method. What we'd like is
483 // It would be nice to have an API that let us ask
484 // how many processes are bound to a processor,
485 // but we don't have that, either.
486 // In the short term, "board" is static so that
487 // subsequent distributions don't all start at board 0.
488 static uint board = 0;
489 uint assigned = 0;
490 // Until we've found enough processors ....
491 while (assigned < distribution_length) {
492 // ... find the next available processor in the board.
493 for (uint slot = 0; slot < processors_per_board; slot += 1) {
494 uint try_id = board * processors_per_board + slot;
495 if ((try_id < limit_id) && (available_id[try_id] == true)) {
496 distribution[assigned] = try_id;
497 available_id[try_id] = false;
498 assigned += 1;
499 break;
500 }
501 }
502 board += 1;
503 if (board * processors_per_board + 0 >= limit_id) {
504 board = 0;
505 }
506 }
507 if (available_id != NULL) {
508 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal);
509 }
510 return true;
511 }
512
513 void os::set_native_thread_name(const char *name) {
514 // Not yet implemented.
515 return;
516 }
517
518 bool os::distribute_processes(uint length, uint* distribution) {
519 bool result = false;
520 // Find the processor id's of all the available CPUs.
521 processorid_t* id_array = NULL;
522 uint id_length = 0;
523 // There are some races between querying information and using it,
524 // since processor sets can change dynamically.
525 psetid_t pset = PS_NONE;
526 // Are we running in a processor set?
527 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
528 result = find_processors_in_pset(pset, &id_array, &id_length);
529 } else {
530 result = find_processors_online(&id_array, &id_length);
531 }
532 if (result == true) {
533 if (id_length >= length) {
534 result = assign_distribution(id_array, id_length, distribution, length);
535 } else {
536 result = false;
537 }
538 }
539 if (id_array != NULL) {
540 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal);
541 }
542 return result;
543 }
544
545 bool os::bind_to_processor(uint processor_id) {
546 // We assume that a processorid_t can be stored in a uint.
547 assert(sizeof(uint) == sizeof(processorid_t),
548 "can't convert uint to processorid_t");
549 int bind_result =
550 processor_bind(P_LWPID, // bind LWP.
551 P_MYID, // bind current LWP.
552 (processorid_t) processor_id, // id.
553 NULL); // don't return old binding.
554 return (bind_result == 0);
555 }
556
557 bool os::getenv(const char* name, char* buffer, int len) {
558 char* val = ::getenv(name);
559 if (val == NULL
560 || strlen(val) + 1 > len ) {
561 if (len > 0) buffer[0] = 0; // return a null string
562 return false;
563 }
564 strcpy(buffer, val);
565 return true;
566 }
567
568
569 // Return true if user is running as root.
570
571 bool os::have_special_privileges() {
572 static bool init = false;
573 static bool privileges = false;
574 if (!init) {
575 privileges = (getuid() != geteuid()) || (getgid() != getegid());
576 init = true;
577 }
578 return privileges;
579 }
580
581
582 void os::init_system_properties_values() {
583 // The next steps are taken in the product version:
584 //
585 // Obtain the JAVA_HOME value from the location of libjvm.so.
586 // This library should be located at:
587 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
588 //
589 // If "/jre/lib/" appears at the right place in the path, then we
590 // assume libjvm.so is installed in a JDK and we use this path.
591 //
592 // Otherwise exit with message: "Could not create the Java virtual machine."
593 //
594 // The following extra steps are taken in the debugging version:
595 //
596 // If "/jre/lib/" does NOT appear at the right place in the path
597 // instead of exit check for $JAVA_HOME environment variable.
598 //
599 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
600 // then we append a fake suffix "hotspot/libjvm.so" to this path so
601 // it looks like libjvm.so is installed there
602 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
603 //
604 // Otherwise exit.
605 //
606 // Important note: if the location of libjvm.so changes this
607 // code needs to be changed accordingly.
608
609 // Base path of extensions installed on the system.
610 #define SYS_EXT_DIR "/usr/jdk/packages"
611 #define EXTENSIONS_DIR "/lib/ext"
612 #define ENDORSED_DIR "/lib/endorsed"
613
614 char cpu_arch[12];
615 // Buffer that fits several sprintfs.
616 // Note that the space for the colon and the trailing null are provided
617 // by the nulls included by the sizeof operator.
618 const size_t bufsize =
619 MAX4((size_t)MAXPATHLEN, // For dll_dir & friends.
620 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
621 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir
622 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
623 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
624
625 // sysclasspath, java_home, dll_dir
626 {
627 char *pslash;
628 os::jvm_path(buf, bufsize);
629
630 // Found the full path to libjvm.so.
631 // Now cut the path to <java_home>/jre if we can.
632 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
633 pslash = strrchr(buf, '/');
634 if (pslash != NULL) {
635 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
636 }
637 Arguments::set_dll_dir(buf);
638
639 if (pslash != NULL) {
640 pslash = strrchr(buf, '/');
641 if (pslash != NULL) {
642 *pslash = '\0'; // Get rid of /<arch>.
643 pslash = strrchr(buf, '/');
644 if (pslash != NULL) {
645 *pslash = '\0'; // Get rid of /lib.
646 }
647 }
648 }
649 Arguments::set_java_home(buf);
650 set_boot_path('/', ':');
651 }
652
653 // Where to look for native libraries.
654 {
655 // Use dlinfo() to determine the correct java.library.path.
656 //
657 // If we're launched by the Java launcher, and the user
658 // does not set java.library.path explicitly on the commandline,
659 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
660 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
661 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
662 // /usr/lib), which is exactly what we want.
663 //
664 // If the user does set java.library.path, it completely
665 // overwrites this setting, and always has.
666 //
667 // If we're not launched by the Java launcher, we may
668 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
669 // settings. Again, dlinfo does exactly what we want.
670
671 Dl_serinfo info_sz, *info = &info_sz;
672 Dl_serpath *path;
673 char *library_path;
674 char *common_path = buf;
675
676 // Determine search path count and required buffer size.
677 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
678 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
679 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
680 }
681
682 // Allocate new buffer and initialize.
683 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
684 info->dls_size = info_sz.dls_size;
685 info->dls_cnt = info_sz.dls_cnt;
686
687 // Obtain search path information.
688 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
689 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
690 FREE_C_HEAP_ARRAY(char, info, mtInternal);
691 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
692 }
693
694 path = &info->dls_serpath[0];
695
696 // Note: Due to a legacy implementation, most of the library path
697 // is set in the launcher. This was to accomodate linking restrictions
698 // on legacy Solaris implementations (which are no longer supported).
699 // Eventually, all the library path setting will be done here.
700 //
701 // However, to prevent the proliferation of improperly built native
702 // libraries, the new path component /usr/jdk/packages is added here.
703
704 // Determine the actual CPU architecture.
705 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
706 #ifdef _LP64
707 // If we are a 64-bit vm, perform the following translations:
708 // sparc -> sparcv9
709 // i386 -> amd64
710 if (strcmp(cpu_arch, "sparc") == 0) {
711 strcat(cpu_arch, "v9");
712 } else if (strcmp(cpu_arch, "i386") == 0) {
713 strcpy(cpu_arch, "amd64");
714 }
715 #endif
716
717 // Construct the invariant part of ld_library_path.
718 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
719
720 // Struct size is more than sufficient for the path components obtained
721 // through the dlinfo() call, so only add additional space for the path
722 // components explicitly added here.
723 size_t library_path_size = info->dls_size + strlen(common_path);
724 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
725 library_path[0] = '\0';
726
727 // Construct the desired Java library path from the linker's library
728 // search path.
729 //
730 // For compatibility, it is optimal that we insert the additional path
731 // components specific to the Java VM after those components specified
732 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
733 // infrastructure.
734 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
735 strcpy(library_path, common_path);
736 } else {
737 int inserted = 0;
738 int i;
739 for (i = 0; i < info->dls_cnt; i++, path++) {
740 uint_t flags = path->dls_flags & LA_SER_MASK;
741 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
742 strcat(library_path, common_path);
743 strcat(library_path, os::path_separator());
744 inserted = 1;
745 }
746 strcat(library_path, path->dls_name);
747 strcat(library_path, os::path_separator());
748 }
749 // Eliminate trailing path separator.
750 library_path[strlen(library_path)-1] = '\0';
751 }
752
753 // happens before argument parsing - can't use a trace flag
754 // tty->print_raw("init_system_properties_values: native lib path: ");
755 // tty->print_raw_cr(library_path);
756
757 // Callee copies into its own buffer.
758 Arguments::set_library_path(library_path);
759
760 FREE_C_HEAP_ARRAY(char, library_path, mtInternal);
761 FREE_C_HEAP_ARRAY(char, info, mtInternal);
762 }
763
764 // Extensions directories.
765 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
766 Arguments::set_ext_dirs(buf);
767
768 // Endorsed standards default directory.
769 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
770 Arguments::set_endorsed_dirs(buf);
771
772 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
773
774 #undef SYS_EXT_DIR
775 #undef EXTENSIONS_DIR
776 #undef ENDORSED_DIR
777 }
778
779 void os::breakpoint() {
780 BREAKPOINT;
781 }
782
783 bool os::obsolete_option(const JavaVMOption *option)
784 {
785 if (!strncmp(option->optionString, "-Xt", 3)) {
786 return true;
787 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
788 return true;
789 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
790 return true;
791 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
792 return true;
793 }
794 return false;
795 }
796
797 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
798 address stackStart = (address)thread->stack_base();
799 address stackEnd = (address)(stackStart - (address)thread->stack_size());
800 if (sp < stackStart && sp >= stackEnd) return true;
801 return false;
802 }
803
804 extern "C" void breakpoint() {
805 // use debugger to set breakpoint here
806 }
807
808 static thread_t main_thread;
809
810 // Thread start routine for all new Java threads
811 extern "C" void* java_start(void* thread_addr) {
812 // Try to randomize the cache line index of hot stack frames.
813 // This helps when threads of the same stack traces evict each other's
814 // cache lines. The threads can be either from the same JVM instance, or
815 // from different JVM instances. The benefit is especially true for
816 // processors with hyperthreading technology.
817 static int counter = 0;
818 int pid = os::current_process_id();
819 alloca(((pid ^ counter++) & 7) * 128);
820
821 int prio;
822 Thread* thread = (Thread*)thread_addr;
823 OSThread* osthr = thread->osthread();
824
825 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
826 thread->_schedctl = (void *) schedctl_init();
827
828 if (UseNUMA) {
829 int lgrp_id = os::numa_get_group_id();
830 if (lgrp_id != -1) {
831 thread->set_lgrp_id(lgrp_id);
832 }
833 }
834
835 // If the creator called set priority before we started,
836 // we need to call set_native_priority now that we have an lwp.
837 // We used to get the priority from thr_getprio (we called
838 // thr_setprio way back in create_thread) and pass it to
839 // set_native_priority, but Solaris scales the priority
840 // in java_to_os_priority, so when we read it back here,
841 // we pass trash to set_native_priority instead of what's
842 // in java_to_os_priority. So we save the native priority
843 // in the osThread and recall it here.
844
845 if (osthr->thread_id() != -1) {
846 if (UseThreadPriorities) {
847 int prio = osthr->native_priority();
848 if (ThreadPriorityVerbose) {
849 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
850 INTPTR_FORMAT ", setting priority: %d\n",
851 osthr->thread_id(), osthr->lwp_id(), prio);
852 }
853 os::set_native_priority(thread, prio);
854 }
855 } else if (ThreadPriorityVerbose) {
856 warning("Can't set priority in _start routine, thread id hasn't been set\n");
857 }
858
859 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
860
861 // initialize signal mask for this thread
862 os::Solaris::hotspot_sigmask(thread);
863
864 thread->run();
865
866 // One less thread is executing
867 // When the VMThread gets here, the main thread may have already exited
868 // which frees the CodeHeap containing the Atomic::dec code
869 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
870 Atomic::dec(&os::Solaris::_os_thread_count);
871 }
872
873 if (UseDetachedThreads) {
874 thr_exit(NULL);
875 ShouldNotReachHere();
876 }
877 return NULL;
878 }
879
880 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
881 // Allocate the OSThread object
882 OSThread* osthread = new OSThread(NULL, NULL);
883 if (osthread == NULL) return NULL;
884
885 // Store info on the Solaris thread into the OSThread
886 osthread->set_thread_id(thread_id);
887 osthread->set_lwp_id(_lwp_self());
888 thread->_schedctl = (void *) schedctl_init();
889
890 if (UseNUMA) {
891 int lgrp_id = os::numa_get_group_id();
892 if (lgrp_id != -1) {
893 thread->set_lgrp_id(lgrp_id);
894 }
895 }
896
897 if (ThreadPriorityVerbose) {
898 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
899 osthread->thread_id(), osthread->lwp_id());
900 }
901
902 // Initial thread state is INITIALIZED, not SUSPENDED
903 osthread->set_state(INITIALIZED);
904
905 return osthread;
906 }
907
908 void os::Solaris::hotspot_sigmask(Thread* thread) {
909
910 //Save caller's signal mask
911 sigset_t sigmask;
912 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
913 OSThread *osthread = thread->osthread();
914 osthread->set_caller_sigmask(sigmask);
915
916 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
917 if (!ReduceSignalUsage) {
918 if (thread->is_VM_thread()) {
919 // Only the VM thread handles BREAK_SIGNAL ...
920 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
921 } else {
922 // ... all other threads block BREAK_SIGNAL
923 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
924 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
925 }
926 }
927 }
928
929 bool os::create_attached_thread(JavaThread* thread) {
930 #ifdef ASSERT
931 thread->verify_not_published();
932 #endif
933 OSThread* osthread = create_os_thread(thread, thr_self());
934 if (osthread == NULL) {
935 return false;
936 }
937
938 // Initial thread state is RUNNABLE
939 osthread->set_state(RUNNABLE);
940 thread->set_osthread(osthread);
941
942 // initialize signal mask for this thread
943 // and save the caller's signal mask
944 os::Solaris::hotspot_sigmask(thread);
945
946 return true;
947 }
948
949 bool os::create_main_thread(JavaThread* thread) {
950 #ifdef ASSERT
951 thread->verify_not_published();
952 #endif
953 if (_starting_thread == NULL) {
954 _starting_thread = create_os_thread(thread, main_thread);
955 if (_starting_thread == NULL) {
956 return false;
957 }
958 }
959
960 // The primodial thread is runnable from the start
961 _starting_thread->set_state(RUNNABLE);
962
963 thread->set_osthread(_starting_thread);
964
965 // initialize signal mask for this thread
966 // and save the caller's signal mask
967 os::Solaris::hotspot_sigmask(thread);
968
969 return true;
970 }
971
972
973 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
974 // Allocate the OSThread object
975 OSThread* osthread = new OSThread(NULL, NULL);
976 if (osthread == NULL) {
977 return false;
978 }
979
980 if (ThreadPriorityVerbose) {
981 char *thrtyp;
982 switch (thr_type) {
983 case vm_thread:
984 thrtyp = (char *)"vm";
985 break;
986 case cgc_thread:
987 thrtyp = (char *)"cgc";
988 break;
989 case pgc_thread:
990 thrtyp = (char *)"pgc";
991 break;
992 case java_thread:
993 thrtyp = (char *)"java";
994 break;
995 case compiler_thread:
996 thrtyp = (char *)"compiler";
997 break;
998 case watcher_thread:
999 thrtyp = (char *)"watcher";
1000 break;
1001 default:
1002 thrtyp = (char *)"unknown";
1003 break;
1004 }
1005 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
1006 }
1007
1008 // Calculate stack size if it's not specified by caller.
1009 if (stack_size == 0) {
1010 // The default stack size 1M (2M for LP64).
1011 stack_size = (BytesPerWord >> 2) * K * K;
1012
1013 switch (thr_type) {
1014 case os::java_thread:
1015 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
1016 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
1017 break;
1018 case os::compiler_thread:
1019 if (CompilerThreadStackSize > 0) {
1020 stack_size = (size_t)(CompilerThreadStackSize * K);
1021 break;
1022 } // else fall through:
1023 // use VMThreadStackSize if CompilerThreadStackSize is not defined
1024 case os::vm_thread:
1025 case os::pgc_thread:
1026 case os::cgc_thread:
1027 case os::watcher_thread:
1028 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
1029 break;
1030 }
1031 }
1032 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
1033
1034 // Initial state is ALLOCATED but not INITIALIZED
1035 osthread->set_state(ALLOCATED);
1036
1037 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
1038 // We got lots of threads. Check if we still have some address space left.
1039 // Need to be at least 5Mb of unreserved address space. We do check by
1040 // trying to reserve some.
1041 const size_t VirtualMemoryBangSize = 20*K*K;
1042 char* mem = os::reserve_memory(VirtualMemoryBangSize);
1043 if (mem == NULL) {
1044 delete osthread;
1045 return false;
1046 } else {
1047 // Release the memory again
1048 os::release_memory(mem, VirtualMemoryBangSize);
1049 }
1050 }
1051
1052 // Setup osthread because the child thread may need it.
1053 thread->set_osthread(osthread);
1054
1055 // Create the Solaris thread
1056 thread_t tid = 0;
1057 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
1058 int status;
1059
1060 // Mark that we don't have an lwp or thread id yet.
1061 // In case we attempt to set the priority before the thread starts.
1062 osthread->set_lwp_id(-1);
1063 osthread->set_thread_id(-1);
1064
1065 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1066 if (status != 0) {
1067 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1068 perror("os::create_thread");
1069 }
1070 thread->set_osthread(NULL);
1071 // Need to clean up stuff we've allocated so far
1072 delete osthread;
1073 return false;
1074 }
1075
1076 Atomic::inc(&os::Solaris::_os_thread_count);
1077
1078 // Store info on the Solaris thread into the OSThread
1079 osthread->set_thread_id(tid);
1080
1081 // Remember that we created this thread so we can set priority on it
1082 osthread->set_vm_created();
1083
1084 // Initial thread state is INITIALIZED, not SUSPENDED
1085 osthread->set_state(INITIALIZED);
1086
1087 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1088 return true;
1089 }
1090
1091 /* defined for >= Solaris 10. This allows builds on earlier versions
1092 * of Solaris to take advantage of the newly reserved Solaris JVM signals
1093 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2
1094 * and -XX:+UseAltSigs does nothing since these should have no conflict
1095 */
1096 #if !defined(SIGJVM1)
1097 #define SIGJVM1 39
1098 #define SIGJVM2 40
1099 #endif
1100
1101 debug_only(static bool signal_sets_initialized = false);
1102 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1103 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL;
1104 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1105
1106 bool os::Solaris::is_sig_ignored(int sig) {
1107 struct sigaction oact;
1108 sigaction(sig, (struct sigaction*)NULL, &oact);
1109 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1110 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1111 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
1112 return true;
1113 else
1114 return false;
1115 }
1116
1117 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1118 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1119 static bool isJVM1available() {
1120 return SIGJVM1 < SIGRTMIN;
1121 }
1122
1123 void os::Solaris::signal_sets_init() {
1124 // Should also have an assertion stating we are still single-threaded.
1125 assert(!signal_sets_initialized, "Already initialized");
1126 // Fill in signals that are necessarily unblocked for all threads in
1127 // the VM. Currently, we unblock the following signals:
1128 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1129 // by -Xrs (=ReduceSignalUsage));
1130 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1131 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1132 // the dispositions or masks wrt these signals.
1133 // Programs embedding the VM that want to use the above signals for their
1134 // own purposes must, at this time, use the "-Xrs" option to prevent
1135 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1136 // (See bug 4345157, and other related bugs).
1137 // In reality, though, unblocking these signals is really a nop, since
1138 // these signals are not blocked by default.
1139 sigemptyset(&unblocked_sigs);
1140 sigemptyset(&allowdebug_blocked_sigs);
1141 sigaddset(&unblocked_sigs, SIGILL);
1142 sigaddset(&unblocked_sigs, SIGSEGV);
1143 sigaddset(&unblocked_sigs, SIGBUS);
1144 sigaddset(&unblocked_sigs, SIGFPE);
1145
1146 if (isJVM1available) {
1147 os::Solaris::set_SIGinterrupt(SIGJVM1);
1148 os::Solaris::set_SIGasync(SIGJVM2);
1149 } else if (UseAltSigs) {
1150 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL);
1151 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1152 } else {
1153 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL);
1154 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1155 }
1156
1157 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt());
1158 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1159
1160 if (!ReduceSignalUsage) {
1161 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1162 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1163 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1164 }
1165 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1166 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1167 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1168 }
1169 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1170 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1171 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1172 }
1173 }
1174 // Fill in signals that are blocked by all but the VM thread.
1175 sigemptyset(&vm_sigs);
1176 if (!ReduceSignalUsage)
1177 sigaddset(&vm_sigs, BREAK_SIGNAL);
1178 debug_only(signal_sets_initialized = true);
1179
1180 // For diagnostics only used in run_periodic_checks
1181 sigemptyset(&check_signal_done);
1182 }
1183
1184 // These are signals that are unblocked while a thread is running Java.
1185 // (For some reason, they get blocked by default.)
1186 sigset_t* os::Solaris::unblocked_signals() {
1187 assert(signal_sets_initialized, "Not initialized");
1188 return &unblocked_sigs;
1189 }
1190
1191 // These are the signals that are blocked while a (non-VM) thread is
1192 // running Java. Only the VM thread handles these signals.
1193 sigset_t* os::Solaris::vm_signals() {
1194 assert(signal_sets_initialized, "Not initialized");
1195 return &vm_sigs;
1196 }
1197
1198 // These are signals that are blocked during cond_wait to allow debugger in
1199 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1200 assert(signal_sets_initialized, "Not initialized");
1201 return &allowdebug_blocked_sigs;
1202 }
1203
1204
1205 void _handle_uncaught_cxx_exception() {
1206 VMError err("An uncaught C++ exception");
1207 err.report_and_die();
1208 }
1209
1210
1211 // First crack at OS-specific initialization, from inside the new thread.
1212 void os::initialize_thread(Thread* thr) {
1213 int r = thr_main();
1214 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1215 if (r) {
1216 JavaThread* jt = (JavaThread *)thr;
1217 assert(jt != NULL, "Sanity check");
1218 size_t stack_size;
1219 address base = jt->stack_base();
1220 if (Arguments::created_by_java_launcher()) {
1221 // Use 2MB to allow for Solaris 7 64 bit mode.
1222 stack_size = JavaThread::stack_size_at_create() == 0
1223 ? 2048*K : JavaThread::stack_size_at_create();
1224
1225 // There are rare cases when we may have already used more than
1226 // the basic stack size allotment before this method is invoked.
1227 // Attempt to allow for a normally sized java_stack.
1228 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1229 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1230 } else {
1231 // 6269555: If we were not created by a Java launcher, i.e. if we are
1232 // running embedded in a native application, treat the primordial thread
1233 // as much like a native attached thread as possible. This means using
1234 // the current stack size from thr_stksegment(), unless it is too large
1235 // to reliably setup guard pages. A reasonable max size is 8MB.
1236 size_t current_size = current_stack_size();
1237 // This should never happen, but just in case....
1238 if (current_size == 0) current_size = 2 * K * K;
1239 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1240 }
1241 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1242 stack_size = (size_t)(base - bottom);
1243
1244 assert(stack_size > 0, "Stack size calculation problem");
1245
1246 if (stack_size > jt->stack_size()) {
1247 NOT_PRODUCT(
1248 struct rlimit limits;
1249 getrlimit(RLIMIT_STACK, &limits);
1250 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1251 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1252 )
1253 tty->print_cr(
1254 "Stack size of %d Kb exceeds current limit of %d Kb.\n"
1255 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1256 "See limit(1) to increase the stack size limit.",
1257 stack_size / K, jt->stack_size() / K);
1258 vm_exit(1);
1259 }
1260 assert(jt->stack_size() >= stack_size,
1261 "Attempt to map more stack than was allocated");
1262 jt->set_stack_size(stack_size);
1263 }
1264
1265 // With the T2 libthread (T1 is no longer supported) threads are always bound
1266 // and we use stackbanging in all cases.
1267
1268 os::Solaris::init_thread_fpu_state();
1269 std::set_terminate(_handle_uncaught_cxx_exception);
1270 }
1271
1272
1273
1274 // Free Solaris resources related to the OSThread
1275 void os::free_thread(OSThread* osthread) {
1276 assert(osthread != NULL, "os::free_thread but osthread not set");
1277
1278
1279 // We are told to free resources of the argument thread,
1280 // but we can only really operate on the current thread.
1281 // The main thread must take the VMThread down synchronously
1282 // before the main thread exits and frees up CodeHeap
1283 guarantee((Thread::current()->osthread() == osthread
1284 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1285 if (Thread::current()->osthread() == osthread) {
1286 // Restore caller's signal mask
1287 sigset_t sigmask = osthread->caller_sigmask();
1288 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1289 }
1290 delete osthread;
1291 }
1292
1293 void os::pd_start_thread(Thread* thread) {
1294 int status = thr_continue(thread->osthread()->thread_id());
1295 assert_status(status == 0, status, "thr_continue failed");
1296 }
1297
1298
1299 intx os::current_thread_id() {
1300 return (intx)thr_self();
1301 }
1302
1303 static pid_t _initial_pid = 0;
1304
1305 int os::current_process_id() {
1306 return (int)(_initial_pid ? _initial_pid : getpid());
1307 }
1308
1309 int os::allocate_thread_local_storage() {
1310 // %%% in Win32 this allocates a memory segment pointed to by a
1311 // register. Dan Stein can implement a similar feature in
1312 // Solaris. Alternatively, the VM can do the same thing
1313 // explicitly: malloc some storage and keep the pointer in a
1314 // register (which is part of the thread's context) (or keep it
1315 // in TLS).
1316 // %%% In current versions of Solaris, thr_self and TSD can
1317 // be accessed via short sequences of displaced indirections.
1318 // The value of thr_self is available as %g7(36).
1319 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4),
1320 // assuming that the current thread already has a value bound to k.
1321 // It may be worth experimenting with such access patterns,
1322 // and later having the parameters formally exported from a Solaris
1323 // interface. I think, however, that it will be faster to
1324 // maintain the invariant that %g2 always contains the
1325 // JavaThread in Java code, and have stubs simply
1326 // treat %g2 as a caller-save register, preserving it in a %lN.
1327 thread_key_t tk;
1328 if (thr_keycreate( &tk, NULL))
1329 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed "
1330 "(%s)", strerror(errno)));
1331 return int(tk);
1332 }
1333
1334 void os::free_thread_local_storage(int index) {
1335 // %%% don't think we need anything here
1336 // if ( pthread_key_delete((pthread_key_t) tk) )
1337 // fatal("os::free_thread_local_storage: pthread_key_delete failed");
1338 }
1339
1340 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific
1341 // small number - point is NO swap space available
1342 void os::thread_local_storage_at_put(int index, void* value) {
1343 // %%% this is used only in threadLocalStorage.cpp
1344 if (thr_setspecific((thread_key_t)index, value)) {
1345 if (errno == ENOMEM) {
1346 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR,
1347 "thr_setspecific: out of swap space");
1348 } else {
1349 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed "
1350 "(%s)", strerror(errno)));
1351 }
1352 } else {
1353 ThreadLocalStorage::set_thread_in_slot((Thread *) value);
1354 }
1355 }
1356
1357 // This function could be called before TLS is initialized, for example, when
1358 // VM receives an async signal or when VM causes a fatal error during
1359 // initialization. Return NULL if thr_getspecific() fails.
1360 void* os::thread_local_storage_at(int index) {
1361 // %%% this is used only in threadLocalStorage.cpp
1362 void* r = NULL;
1363 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r;
1364 }
1365
1366
1367 // gethrtime() should be monotonic according to the documentation,
1368 // but some virtualized platforms are known to break this guarantee.
1369 // getTimeNanos() must be guaranteed not to move backwards, so we
1370 // are forced to add a check here.
1371 inline hrtime_t getTimeNanos() {
1372 const hrtime_t now = gethrtime();
1373 const hrtime_t prev = max_hrtime;
1374 if (now <= prev) {
1375 return prev; // same or retrograde time;
1376 }
1377 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1378 assert(obsv >= prev, "invariant"); // Monotonicity
1379 // If the CAS succeeded then we're done and return "now".
1380 // If the CAS failed and the observed value "obsv" is >= now then
1381 // we should return "obsv". If the CAS failed and now > obsv > prv then
1382 // some other thread raced this thread and installed a new value, in which case
1383 // we could either (a) retry the entire operation, (b) retry trying to install now
1384 // or (c) just return obsv. We use (c). No loop is required although in some cases
1385 // we might discard a higher "now" value in deference to a slightly lower but freshly
1386 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1387 // to (a) or (b) -- and greatly reduces coherence traffic.
1388 // We might also condition (c) on the magnitude of the delta between obsv and now.
1389 // Avoiding excessive CAS operations to hot RW locations is critical.
1390 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1391 return (prev == obsv) ? now : obsv;
1392 }
1393
1394 // Time since start-up in seconds to a fine granularity.
1395 // Used by VMSelfDestructTimer and the MemProfiler.
1396 double os::elapsedTime() {
1397 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1398 }
1399
1400 jlong os::elapsed_counter() {
1401 return (jlong)(getTimeNanos() - first_hrtime);
1402 }
1403
1404 jlong os::elapsed_frequency() {
1405 return hrtime_hz;
1406 }
1407
1408 // Return the real, user, and system times in seconds from an
1409 // arbitrary fixed point in the past.
1410 bool os::getTimesSecs(double* process_real_time,
1411 double* process_user_time,
1412 double* process_system_time) {
1413 struct tms ticks;
1414 clock_t real_ticks = times(&ticks);
1415
1416 if (real_ticks == (clock_t) (-1)) {
1417 return false;
1418 } else {
1419 double ticks_per_second = (double) clock_tics_per_sec;
1420 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1421 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1422 // For consistency return the real time from getTimeNanos()
1423 // converted to seconds.
1424 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1425
1426 return true;
1427 }
1428 }
1429
1430 bool os::supports_vtime() { return true; }
1431
1432 bool os::enable_vtime() {
1433 int fd = ::open("/proc/self/ctl", O_WRONLY);
1434 if (fd == -1)
1435 return false;
1436
1437 long cmd[] = { PCSET, PR_MSACCT };
1438 int res = ::write(fd, cmd, sizeof(long) * 2);
1439 ::close(fd);
1440 if (res != sizeof(long) * 2)
1441 return false;
1442
1443 return true;
1444 }
1445
1446 bool os::vtime_enabled() {
1447 int fd = ::open("/proc/self/status", O_RDONLY);
1448 if (fd == -1)
1449 return false;
1450
1451 pstatus_t status;
1452 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1453 ::close(fd);
1454 if (res != sizeof(pstatus_t))
1455 return false;
1456
1457 return status.pr_flags & PR_MSACCT;
1458 }
1459
1460 double os::elapsedVTime() {
1461 return (double)gethrvtime() / (double)hrtime_hz;
1462 }
1463
1464 // Used internally for comparisons only
1465 // getTimeMillis guaranteed to not move backwards on Solaris
1466 jlong getTimeMillis() {
1467 jlong nanotime = getTimeNanos();
1468 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1469 }
1470
1471 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1472 jlong os::javaTimeMillis() {
1473 timeval t;
1474 if (gettimeofday( &t, NULL) == -1)
1475 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)));
1476 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1477 }
1478
1479 jlong os::javaTimeNanos() {
1480 return (jlong)getTimeNanos();
1481 }
1482
1483 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1484 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1485 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1486 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1487 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1488 }
1489
1490 char * os::local_time_string(char *buf, size_t buflen) {
1491 struct tm t;
1492 time_t long_time;
1493 time(&long_time);
1494 localtime_r(&long_time, &t);
1495 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1496 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1497 t.tm_hour, t.tm_min, t.tm_sec);
1498 return buf;
1499 }
1500
1501 // Note: os::shutdown() might be called very early during initialization, or
1502 // called from signal handler. Before adding something to os::shutdown(), make
1503 // sure it is async-safe and can handle partially initialized VM.
1504 void os::shutdown() {
1505
1506 // allow PerfMemory to attempt cleanup of any persistent resources
1507 perfMemory_exit();
1508
1509 // needs to remove object in file system
1510 AttachListener::abort();
1511
1512 // flush buffered output, finish log files
1513 ostream_abort();
1514
1515 // Check for abort hook
1516 abort_hook_t abort_hook = Arguments::abort_hook();
1517 if (abort_hook != NULL) {
1518 abort_hook();
1519 }
1520 }
1521
1522 // Note: os::abort() might be called very early during initialization, or
1523 // called from signal handler. Before adding something to os::abort(), make
1524 // sure it is async-safe and can handle partially initialized VM.
1525 void os::abort(bool dump_core) {
1526 os::shutdown();
1527 if (dump_core) {
1528 #ifndef PRODUCT
1529 fdStream out(defaultStream::output_fd());
1530 out.print_raw("Current thread is ");
1531 char buf[16];
1532 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1533 out.print_raw_cr(buf);
1534 out.print_raw_cr("Dumping core ...");
1535 #endif
1536 ::abort(); // dump core (for debugging)
1537 }
1538
1539 ::exit(1);
1540 }
1541
1542 // Die immediately, no exit hook, no abort hook, no cleanup.
1543 void os::die() {
1544 ::abort(); // dump core (for debugging)
1545 }
1546
1547 // unused
1548 void os::set_error_file(const char *logfile) {}
1549
1550 // DLL functions
1551
1552 const char* os::dll_file_extension() { return ".so"; }
1553
1554 // This must be hard coded because it's the system's temporary
1555 // directory not the java application's temp directory, ala java.io.tmpdir.
1556 const char* os::get_temp_directory() { return "/tmp"; }
1557
1558 static bool file_exists(const char* filename) {
1559 struct stat statbuf;
1560 if (filename == NULL || strlen(filename) == 0) {
1561 return false;
1562 }
1563 return os::stat(filename, &statbuf) == 0;
1564 }
1565
1566 bool os::dll_build_name(char* buffer, size_t buflen,
1567 const char* pname, const char* fname) {
1568 bool retval = false;
1569 const size_t pnamelen = pname ? strlen(pname) : 0;
1570
1571 // Return error on buffer overflow.
1572 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1573 return retval;
1574 }
1575
1576 if (pnamelen == 0) {
1577 snprintf(buffer, buflen, "lib%s.so", fname);
1578 retval = true;
1579 } else if (strchr(pname, *os::path_separator()) != NULL) {
1580 int n;
1581 char** pelements = split_path(pname, &n);
1582 if (pelements == NULL) {
1583 return false;
1584 }
1585 for (int i = 0; i < n; i++) {
1586 // really shouldn't be NULL but what the heck, check can't hurt
1587 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1588 continue; // skip the empty path values
1589 }
1590 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1591 if (file_exists(buffer)) {
1592 retval = true;
1593 break;
1594 }
1595 }
1596 // release the storage
1597 for (int i = 0; i < n; i++) {
1598 if (pelements[i] != NULL) {
1599 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1600 }
1601 }
1602 if (pelements != NULL) {
1603 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1604 }
1605 } else {
1606 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1607 retval = true;
1608 }
1609 return retval;
1610 }
1611
1612 // check if addr is inside libjvm.so
1613 bool os::address_is_in_vm(address addr) {
1614 static address libjvm_base_addr;
1615 Dl_info dlinfo;
1616
1617 if (libjvm_base_addr == NULL) {
1618 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1619 libjvm_base_addr = (address)dlinfo.dli_fbase;
1620 }
1621 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1622 }
1623
1624 if (dladdr((void *)addr, &dlinfo) != 0) {
1625 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1626 }
1627
1628 return false;
1629 }
1630
1631 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int);
1632 static dladdr1_func_type dladdr1_func = NULL;
1633
1634 bool os::dll_address_to_function_name(address addr, char *buf,
1635 int buflen, int * offset) {
1636 // buf is not optional, but offset is optional
1637 assert(buf != NULL, "sanity check");
1638
1639 Dl_info dlinfo;
1640
1641 // dladdr1_func was initialized in os::init()
1642 if (dladdr1_func != NULL) {
1643 // yes, we have dladdr1
1644
1645 // Support for dladdr1 is checked at runtime; it may be
1646 // available even if the vm is built on a machine that does
1647 // not have dladdr1 support. Make sure there is a value for
1648 // RTLD_DL_SYMENT.
1649 #ifndef RTLD_DL_SYMENT
1650 #define RTLD_DL_SYMENT 1
1651 #endif
1652 #ifdef _LP64
1653 Elf64_Sym * info;
1654 #else
1655 Elf32_Sym * info;
1656 #endif
1657 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1658 RTLD_DL_SYMENT) != 0) {
1659 // see if we have a matching symbol that covers our address
1660 if (dlinfo.dli_saddr != NULL &&
1661 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1662 if (dlinfo.dli_sname != NULL) {
1663 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1664 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1665 }
1666 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1667 return true;
1668 }
1669 }
1670 // no matching symbol so try for just file info
1671 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1672 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1673 buf, buflen, offset, dlinfo.dli_fname)) {
1674 return true;
1675 }
1676 }
1677 }
1678 buf[0] = '\0';
1679 if (offset != NULL) *offset = -1;
1680 return false;
1681 }
1682
1683 // no, only dladdr is available
1684 if (dladdr((void *)addr, &dlinfo) != 0) {
1685 // see if we have a matching symbol
1686 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1687 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
1688 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1689 }
1690 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1691 return true;
1692 }
1693 // no matching symbol so try for just file info
1694 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1695 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1696 buf, buflen, offset, dlinfo.dli_fname)) {
1697 return true;
1698 }
1699 }
1700 }
1701 buf[0] = '\0';
1702 if (offset != NULL) *offset = -1;
1703 return false;
1704 }
1705
1706 bool os::dll_address_to_library_name(address addr, char* buf,
1707 int buflen, int* offset) {
1708 // buf is not optional, but offset is optional
1709 assert(buf != NULL, "sanity check");
1710
1711 Dl_info dlinfo;
1712
1713 if (dladdr((void*)addr, &dlinfo) != 0) {
1714 if (dlinfo.dli_fname != NULL) {
1715 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1716 }
1717 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1718 *offset = addr - (address)dlinfo.dli_fbase;
1719 }
1720 return true;
1721 }
1722
1723 buf[0] = '\0';
1724 if (offset) *offset = -1;
1725 return false;
1726 }
1727
1728 // Prints the names and full paths of all opened dynamic libraries
1729 // for current process
1730 void os::print_dll_info(outputStream * st) {
1731 Dl_info dli;
1732 void *handle;
1733 Link_map *map;
1734 Link_map *p;
1735
1736 st->print_cr("Dynamic libraries:"); st->flush();
1737
1738 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
1739 dli.dli_fname == NULL) {
1740 st->print_cr("Error: Cannot print dynamic libraries.");
1741 return;
1742 }
1743 handle = dlopen(dli.dli_fname, RTLD_LAZY);
1744 if (handle == NULL) {
1745 st->print_cr("Error: Cannot print dynamic libraries.");
1746 return;
1747 }
1748 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1749 if (map == NULL) {
1750 st->print_cr("Error: Cannot print dynamic libraries.");
1751 return;
1752 }
1753
1754 while (map->l_prev != NULL)
1755 map = map->l_prev;
1756
1757 while (map != NULL) {
1758 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
1759 map = map->l_next;
1760 }
1761
1762 dlclose(handle);
1763 }
1764
1765 // Loads .dll/.so and
1766 // in case of error it checks if .dll/.so was built for the
1767 // same architecture as Hotspot is running on
1768
1769 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
1770 {
1771 void * result= ::dlopen(filename, RTLD_LAZY);
1772 if (result != NULL) {
1773 // Successful loading
1774 return result;
1775 }
1776
1777 Elf32_Ehdr elf_head;
1778
1779 // Read system error message into ebuf
1780 // It may or may not be overwritten below
1781 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1782 ebuf[ebuflen-1]='\0';
1783 int diag_msg_max_length=ebuflen-strlen(ebuf);
1784 char* diag_msg_buf=ebuf+strlen(ebuf);
1785
1786 if (diag_msg_max_length==0) {
1787 // No more space in ebuf for additional diagnostics message
1788 return NULL;
1789 }
1790
1791
1792 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1793
1794 if (file_descriptor < 0) {
1795 // Can't open library, report dlerror() message
1796 return NULL;
1797 }
1798
1799 bool failed_to_read_elf_head=
1800 (sizeof(elf_head)!=
1801 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1802
1803 ::close(file_descriptor);
1804 if (failed_to_read_elf_head) {
1805 // file i/o error - report dlerror() msg
1806 return NULL;
1807 }
1808
1809 typedef struct {
1810 Elf32_Half code; // Actual value as defined in elf.h
1811 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1812 char elf_class; // 32 or 64 bit
1813 char endianess; // MSB or LSB
1814 char* name; // String representation
1815 } arch_t;
1816
1817 static const arch_t arch_array[]={
1818 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1819 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1820 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1821 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1822 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1823 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1824 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1825 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1826 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1827 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1828 };
1829
1830 #if (defined IA32)
1831 static Elf32_Half running_arch_code=EM_386;
1832 #elif (defined AMD64)
1833 static Elf32_Half running_arch_code=EM_X86_64;
1834 #elif (defined IA64)
1835 static Elf32_Half running_arch_code=EM_IA_64;
1836 #elif (defined __sparc) && (defined _LP64)
1837 static Elf32_Half running_arch_code=EM_SPARCV9;
1838 #elif (defined __sparc) && (!defined _LP64)
1839 static Elf32_Half running_arch_code=EM_SPARC;
1840 #elif (defined __powerpc64__)
1841 static Elf32_Half running_arch_code=EM_PPC64;
1842 #elif (defined __powerpc__)
1843 static Elf32_Half running_arch_code=EM_PPC;
1844 #elif (defined ARM)
1845 static Elf32_Half running_arch_code=EM_ARM;
1846 #else
1847 #error Method os::dll_load requires that one of following is defined:\
1848 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1849 #endif
1850
1851 // Identify compatability class for VM's architecture and library's architecture
1852 // Obtain string descriptions for architectures
1853
1854 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1855 int running_arch_index=-1;
1856
1857 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1858 if (running_arch_code == arch_array[i].code) {
1859 running_arch_index = i;
1860 }
1861 if (lib_arch.code == arch_array[i].code) {
1862 lib_arch.compat_class = arch_array[i].compat_class;
1863 lib_arch.name = arch_array[i].name;
1864 }
1865 }
1866
1867 assert(running_arch_index != -1,
1868 "Didn't find running architecture code (running_arch_code) in arch_array");
1869 if (running_arch_index == -1) {
1870 // Even though running architecture detection failed
1871 // we may still continue with reporting dlerror() message
1872 return NULL;
1873 }
1874
1875 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1876 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1877 return NULL;
1878 }
1879
1880 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1881 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1882 return NULL;
1883 }
1884
1885 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1886 if (lib_arch.name!=NULL) {
1887 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1888 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1889 lib_arch.name, arch_array[running_arch_index].name);
1890 } else {
1891 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1892 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1893 lib_arch.code,
1894 arch_array[running_arch_index].name);
1895 }
1896 }
1897
1898 return NULL;
1899 }
1900
1901 void* os::dll_lookup(void* handle, const char* name) {
1902 return dlsym(handle, name);
1903 }
1904
1905 void* os::get_default_process_handle() {
1906 return (void*)::dlopen(NULL, RTLD_LAZY);
1907 }
1908
1909 int os::stat(const char *path, struct stat *sbuf) {
1910 char pathbuf[MAX_PATH];
1911 if (strlen(path) > MAX_PATH - 1) {
1912 errno = ENAMETOOLONG;
1913 return -1;
1914 }
1915 os::native_path(strcpy(pathbuf, path));
1916 return ::stat(pathbuf, sbuf);
1917 }
1918
1919 static bool _print_ascii_file(const char* filename, outputStream* st) {
1920 int fd = ::open(filename, O_RDONLY);
1921 if (fd == -1) {
1922 return false;
1923 }
1924
1925 char buf[32];
1926 int bytes;
1927 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1928 st->print_raw(buf, bytes);
1929 }
1930
1931 ::close(fd);
1932
1933 return true;
1934 }
1935
1936 void os::print_os_info_brief(outputStream* st) {
1937 os::Solaris::print_distro_info(st);
1938
1939 os::Posix::print_uname_info(st);
1940
1941 os::Solaris::print_libversion_info(st);
1942 }
1943
1944 void os::print_os_info(outputStream* st) {
1945 st->print("OS:");
1946
1947 os::Solaris::print_distro_info(st);
1948
1949 os::Posix::print_uname_info(st);
1950
1951 os::Solaris::print_libversion_info(st);
1952
1953 os::Posix::print_rlimit_info(st);
1954
1955 os::Posix::print_load_average(st);
1956 }
1957
1958 void os::Solaris::print_distro_info(outputStream* st) {
1959 if (!_print_ascii_file("/etc/release", st)) {
1960 st->print("Solaris");
1961 }
1962 st->cr();
1963 }
1964
1965 void os::Solaris::print_libversion_info(outputStream* st) {
1966 st->print(" (T2 libthread)");
1967 st->cr();
1968 }
1969
1970 static bool check_addr0(outputStream* st) {
1971 jboolean status = false;
1972 int fd = ::open("/proc/self/map",O_RDONLY);
1973 if (fd >= 0) {
1974 prmap_t p;
1975 while (::read(fd, &p, sizeof(p)) > 0) {
1976 if (p.pr_vaddr == 0x0) {
1977 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
1978 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
1979 st->print("Access:");
1980 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
1981 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
1982 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
1983 st->cr();
1984 status = true;
1985 }
1986 }
1987 ::close(fd);
1988 }
1989 return status;
1990 }
1991
1992 void os::pd_print_cpu_info(outputStream* st) {
1993 // Nothing to do for now.
1994 }
1995
1996 void os::print_memory_info(outputStream* st) {
1997 st->print("Memory:");
1998 st->print(" %dk page", os::vm_page_size()>>10);
1999 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
2000 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
2001 st->cr();
2002 (void) check_addr0(st);
2003 }
2004
2005 void os::print_siginfo(outputStream* st, void* siginfo) {
2006 const siginfo_t* si = (const siginfo_t*)siginfo;
2007
2008 os::Posix::print_siginfo_brief(st, si);
2009
2010 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
2011 UseSharedSpaces) {
2012 FileMapInfo* mapinfo = FileMapInfo::current_info();
2013 if (mapinfo->is_in_shared_space(si->si_addr)) {
2014 st->print("\n\nError accessing class data sharing archive." \
2015 " Mapped file inaccessible during execution, " \
2016 " possible disk/network problem.");
2017 }
2018 }
2019 st->cr();
2020 }
2021
2022 // Moved from whole group, because we need them here for diagnostic
2023 // prints.
2024 #define OLDMAXSIGNUM 32
2025 static int Maxsignum = 0;
2026 static int *ourSigFlags = NULL;
2027
2028 extern "C" void sigINTRHandler(int, siginfo_t*, void*);
2029
2030 int os::Solaris::get_our_sigflags(int sig) {
2031 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2032 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2033 return ourSigFlags[sig];
2034 }
2035
2036 void os::Solaris::set_our_sigflags(int sig, int flags) {
2037 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2038 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2039 ourSigFlags[sig] = flags;
2040 }
2041
2042
2043 static const char* get_signal_handler_name(address handler,
2044 char* buf, int buflen) {
2045 int offset;
2046 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2047 if (found) {
2048 // skip directory names
2049 const char *p1, *p2;
2050 p1 = buf;
2051 size_t len = strlen(os::file_separator());
2052 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2053 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2054 } else {
2055 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2056 }
2057 return buf;
2058 }
2059
2060 static void print_signal_handler(outputStream* st, int sig,
2061 char* buf, size_t buflen) {
2062 struct sigaction sa;
2063
2064 sigaction(sig, NULL, &sa);
2065
2066 st->print("%s: ", os::exception_name(sig, buf, buflen));
2067
2068 address handler = (sa.sa_flags & SA_SIGINFO)
2069 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2070 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2071
2072 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2073 st->print("SIG_DFL");
2074 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2075 st->print("SIG_IGN");
2076 } else {
2077 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2078 }
2079
2080 st->print(", sa_mask[0]=");
2081 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2082
2083 address rh = VMError::get_resetted_sighandler(sig);
2084 // May be, handler was resetted by VMError?
2085 if (rh != NULL) {
2086 handler = rh;
2087 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2088 }
2089
2090 st->print(", sa_flags=");
2091 os::Posix::print_sa_flags(st, sa.sa_flags);
2092
2093 // Check: is it our handler?
2094 if (handler == CAST_FROM_FN_PTR(address, signalHandler) ||
2095 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) {
2096 // It is our signal handler
2097 // check for flags
2098 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2099 st->print(
2100 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2101 os::Solaris::get_our_sigflags(sig));
2102 }
2103 }
2104 st->cr();
2105 }
2106
2107 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2108 st->print_cr("Signal Handlers:");
2109 print_signal_handler(st, SIGSEGV, buf, buflen);
2110 print_signal_handler(st, SIGBUS , buf, buflen);
2111 print_signal_handler(st, SIGFPE , buf, buflen);
2112 print_signal_handler(st, SIGPIPE, buf, buflen);
2113 print_signal_handler(st, SIGXFSZ, buf, buflen);
2114 print_signal_handler(st, SIGILL , buf, buflen);
2115 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
2116 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2117 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2118 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2119 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2120 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2121 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen);
2122 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2123 }
2124
2125 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2126
2127 // Find the full path to the current module, libjvm.so
2128 void os::jvm_path(char *buf, jint buflen) {
2129 // Error checking.
2130 if (buflen < MAXPATHLEN) {
2131 assert(false, "must use a large-enough buffer");
2132 buf[0] = '\0';
2133 return;
2134 }
2135 // Lazy resolve the path to current module.
2136 if (saved_jvm_path[0] != 0) {
2137 strcpy(buf, saved_jvm_path);
2138 return;
2139 }
2140
2141 Dl_info dlinfo;
2142 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2143 assert(ret != 0, "cannot locate libjvm");
2144 if (ret != 0 && dlinfo.dli_fname != NULL) {
2145 realpath((char *)dlinfo.dli_fname, buf);
2146 } else {
2147 buf[0] = '\0';
2148 return;
2149 }
2150
2151 if (Arguments::sun_java_launcher_is_altjvm()) {
2152 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2153 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2154 // If "/jre/lib/" appears at the right place in the string, then
2155 // assume we are installed in a JDK and we're done. Otherwise, check
2156 // for a JAVA_HOME environment variable and fix up the path so it
2157 // looks like libjvm.so is installed there (append a fake suffix
2158 // hotspot/libjvm.so).
2159 const char *p = buf + strlen(buf) - 1;
2160 for (int count = 0; p > buf && count < 5; ++count) {
2161 for (--p; p > buf && *p != '/'; --p)
2162 /* empty */ ;
2163 }
2164
2165 if (strncmp(p, "/jre/lib/", 9) != 0) {
2166 // Look for JAVA_HOME in the environment.
2167 char* java_home_var = ::getenv("JAVA_HOME");
2168 if (java_home_var != NULL && java_home_var[0] != 0) {
2169 char cpu_arch[12];
2170 char* jrelib_p;
2171 int len;
2172 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2173 #ifdef _LP64
2174 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2175 if (strcmp(cpu_arch, "sparc") == 0) {
2176 strcat(cpu_arch, "v9");
2177 } else if (strcmp(cpu_arch, "i386") == 0) {
2178 strcpy(cpu_arch, "amd64");
2179 }
2180 #endif
2181 // Check the current module name "libjvm.so".
2182 p = strrchr(buf, '/');
2183 assert(strstr(p, "/libjvm") == p, "invalid library name");
2184
2185 realpath(java_home_var, buf);
2186 // determine if this is a legacy image or modules image
2187 // modules image doesn't have "jre" subdirectory
2188 len = strlen(buf);
2189 jrelib_p = buf + len;
2190 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2191 if (0 != access(buf, F_OK)) {
2192 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2193 }
2194
2195 if (0 == access(buf, F_OK)) {
2196 // Use current module name "libjvm.so"
2197 len = strlen(buf);
2198 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2199 } else {
2200 // Go back to path of .so
2201 realpath((char *)dlinfo.dli_fname, buf);
2202 }
2203 }
2204 }
2205 }
2206
2207 strcpy(saved_jvm_path, buf);
2208 }
2209
2210
2211 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2212 // no prefix required, not even "_"
2213 }
2214
2215
2216 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2217 // no suffix required
2218 }
2219
2220 // This method is a copy of JDK's sysGetLastErrorString
2221 // from src/solaris/hpi/src/system_md.c
2222
2223 size_t os::lasterror(char *buf, size_t len) {
2224
2225 if (errno == 0) return 0;
2226
2227 const char *s = ::strerror(errno);
2228 size_t n = ::strlen(s);
2229 if (n >= len) {
2230 n = len - 1;
2231 }
2232 ::strncpy(buf, s, n);
2233 buf[n] = '\0';
2234 return n;
2235 }
2236
2237
2238 // sun.misc.Signal
2239
2240 extern "C" {
2241 static void UserHandler(int sig, void *siginfo, void *context) {
2242 // Ctrl-C is pressed during error reporting, likely because the error
2243 // handler fails to abort. Let VM die immediately.
2244 if (sig == SIGINT && is_error_reported()) {
2245 os::die();
2246 }
2247
2248 os::signal_notify(sig);
2249 // We do not need to reinstate the signal handler each time...
2250 }
2251 }
2252
2253 void* os::user_handler() {
2254 return CAST_FROM_FN_PTR(void*, UserHandler);
2255 }
2256
2257 class Semaphore : public StackObj {
2258 public:
2259 Semaphore();
2260 ~Semaphore();
2261 void signal();
2262 void wait();
2263 bool trywait();
2264 bool timedwait(unsigned int sec, int nsec);
2265 private:
2266 sema_t _semaphore;
2267 };
2268
2269
2270 Semaphore::Semaphore() {
2271 sema_init(&_semaphore, 0, NULL, NULL);
2272 }
2273
2274 Semaphore::~Semaphore() {
2275 sema_destroy(&_semaphore);
2276 }
2277
2278 void Semaphore::signal() {
2279 sema_post(&_semaphore);
2280 }
2281
2282 void Semaphore::wait() {
2283 sema_wait(&_semaphore);
2284 }
2285
2286 bool Semaphore::trywait() {
2287 return sema_trywait(&_semaphore) == 0;
2288 }
2289
2290 bool Semaphore::timedwait(unsigned int sec, int nsec) {
2291 struct timespec ts;
2292 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2293
2294 while (1) {
2295 int result = sema_timedwait(&_semaphore, &ts);
2296 if (result == 0) {
2297 return true;
2298 } else if (errno == EINTR) {
2299 continue;
2300 } else if (errno == ETIME) {
2301 return false;
2302 } else {
2303 return false;
2304 }
2305 }
2306 }
2307
2308 extern "C" {
2309 typedef void (*sa_handler_t)(int);
2310 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2311 }
2312
2313 void* os::signal(int signal_number, void* handler) {
2314 struct sigaction sigAct, oldSigAct;
2315 sigfillset(&(sigAct.sa_mask));
2316 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2317 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2318
2319 if (sigaction(signal_number, &sigAct, &oldSigAct))
2320 // -1 means registration failed
2321 return (void *)-1;
2322
2323 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2324 }
2325
2326 void os::signal_raise(int signal_number) {
2327 raise(signal_number);
2328 }
2329
2330 /*
2331 * The following code is moved from os.cpp for making this
2332 * code platform specific, which it is by its very nature.
2333 */
2334
2335 // a counter for each possible signal value
2336 static int Sigexit = 0;
2337 static int Maxlibjsigsigs;
2338 static jint *pending_signals = NULL;
2339 static int *preinstalled_sigs = NULL;
2340 static struct sigaction *chainedsigactions = NULL;
2341 static sema_t sig_sem;
2342 typedef int (*version_getting_t)();
2343 version_getting_t os::Solaris::get_libjsig_version = NULL;
2344 static int libjsigversion = NULL;
2345
2346 int os::sigexitnum_pd() {
2347 assert(Sigexit > 0, "signal memory not yet initialized");
2348 return Sigexit;
2349 }
2350
2351 void os::Solaris::init_signal_mem() {
2352 // Initialize signal structures
2353 Maxsignum = SIGRTMAX;
2354 Sigexit = Maxsignum+1;
2355 assert(Maxsignum >0, "Unable to obtain max signal number");
2356
2357 Maxlibjsigsigs = Maxsignum;
2358
2359 // pending_signals has one int per signal
2360 // The additional signal is for SIGEXIT - exit signal to signal_thread
2361 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2362 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2363
2364 if (UseSignalChaining) {
2365 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2366 * (Maxsignum + 1), mtInternal);
2367 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2368 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2369 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2370 }
2371 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal);
2372 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2373 }
2374
2375 void os::signal_init_pd() {
2376 int ret;
2377
2378 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2379 assert(ret == 0, "sema_init() failed");
2380 }
2381
2382 void os::signal_notify(int signal_number) {
2383 int ret;
2384
2385 Atomic::inc(&pending_signals[signal_number]);
2386 ret = ::sema_post(&sig_sem);
2387 assert(ret == 0, "sema_post() failed");
2388 }
2389
2390 static int check_pending_signals(bool wait_for_signal) {
2391 int ret;
2392 while (true) {
2393 for (int i = 0; i < Sigexit + 1; i++) {
2394 jint n = pending_signals[i];
2395 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2396 return i;
2397 }
2398 }
2399 if (!wait_for_signal) {
2400 return -1;
2401 }
2402 JavaThread *thread = JavaThread::current();
2403 ThreadBlockInVM tbivm(thread);
2404
2405 bool threadIsSuspended;
2406 do {
2407 thread->set_suspend_equivalent();
2408 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2409 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2410 ;
2411 assert(ret == 0, "sema_wait() failed");
2412
2413 // were we externally suspended while we were waiting?
2414 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2415 if (threadIsSuspended) {
2416 //
2417 // The semaphore has been incremented, but while we were waiting
2418 // another thread suspended us. We don't want to continue running
2419 // while suspended because that would surprise the thread that
2420 // suspended us.
2421 //
2422 ret = ::sema_post(&sig_sem);
2423 assert(ret == 0, "sema_post() failed");
2424
2425 thread->java_suspend_self();
2426 }
2427 } while (threadIsSuspended);
2428 }
2429 }
2430
2431 int os::signal_lookup() {
2432 return check_pending_signals(false);
2433 }
2434
2435 int os::signal_wait() {
2436 return check_pending_signals(true);
2437 }
2438
2439 ////////////////////////////////////////////////////////////////////////////////
2440 // Virtual Memory
2441
2442 static int page_size = -1;
2443
2444 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2445 // clear this var if support is not available.
2446 static bool has_map_align = true;
2447
2448 int os::vm_page_size() {
2449 assert(page_size != -1, "must call os::init");
2450 return page_size;
2451 }
2452
2453 // Solaris allocates memory by pages.
2454 int os::vm_allocation_granularity() {
2455 assert(page_size != -1, "must call os::init");
2456 return page_size;
2457 }
2458
2459 static bool recoverable_mmap_error(int err) {
2460 // See if the error is one we can let the caller handle. This
2461 // list of errno values comes from the Solaris mmap(2) man page.
2462 switch (err) {
2463 case EBADF:
2464 case EINVAL:
2465 case ENOTSUP:
2466 // let the caller deal with these errors
2467 return true;
2468
2469 default:
2470 // Any remaining errors on this OS can cause our reserved mapping
2471 // to be lost. That can cause confusion where different data
2472 // structures think they have the same memory mapped. The worst
2473 // scenario is if both the VM and a library think they have the
2474 // same memory mapped.
2475 return false;
2476 }
2477 }
2478
2479 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2480 int err) {
2481 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2482 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2483 strerror(err), err);
2484 }
2485
2486 static void warn_fail_commit_memory(char* addr, size_t bytes,
2487 size_t alignment_hint, bool exec,
2488 int err) {
2489 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2490 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2491 alignment_hint, exec, strerror(err), err);
2492 }
2493
2494 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2495 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2496 size_t size = bytes;
2497 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2498 if (res != NULL) {
2499 if (UseNUMAInterleaving) {
2500 numa_make_global(addr, bytes);
2501 }
2502 return 0;
2503 }
2504
2505 int err = errno; // save errno from mmap() call in mmap_chunk()
2506
2507 if (!recoverable_mmap_error(err)) {
2508 warn_fail_commit_memory(addr, bytes, exec, err);
2509 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2510 }
2511
2512 return err;
2513 }
2514
2515 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2516 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2517 }
2518
2519 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2520 const char* mesg) {
2521 assert(mesg != NULL, "mesg must be specified");
2522 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2523 if (err != 0) {
2524 // the caller wants all commit errors to exit with the specified mesg:
2525 warn_fail_commit_memory(addr, bytes, exec, err);
2526 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2527 }
2528 }
2529
2530 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2531 size_t alignment_hint, bool exec) {
2532 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2533 if (err == 0) {
2534 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) {
2535 // If the large page size has been set and the VM
2536 // is using large pages, use the large page size
2537 // if it is smaller than the alignment hint. This is
2538 // a case where the VM wants to use a larger alignment size
2539 // for its own reasons but still want to use large pages
2540 // (which is what matters to setting the mpss range.
2541 size_t page_size = 0;
2542 if (large_page_size() < alignment_hint) {
2543 assert(UseLargePages, "Expected to be here for large page use only");
2544 page_size = large_page_size();
2545 } else {
2546 // If the alignment hint is less than the large page
2547 // size, the VM wants a particular alignment (thus the hint)
2548 // for internal reasons. Try to set the mpss range using
2549 // the alignment_hint.
2550 page_size = alignment_hint;
2551 }
2552 // Since this is a hint, ignore any failures.
2553 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2554 }
2555 }
2556 return err;
2557 }
2558
2559 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2560 bool exec) {
2561 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2562 }
2563
2564 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2565 size_t alignment_hint, bool exec,
2566 const char* mesg) {
2567 assert(mesg != NULL, "mesg must be specified");
2568 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2569 if (err != 0) {
2570 // the caller wants all commit errors to exit with the specified mesg:
2571 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2572 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg);
2573 }
2574 }
2575
2576 // Uncommit the pages in a specified region.
2577 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2578 if (madvise(addr, bytes, MADV_FREE) < 0) {
2579 debug_only(warning("MADV_FREE failed."));
2580 return;
2581 }
2582 }
2583
2584 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2585 return os::commit_memory(addr, size, !ExecMem);
2586 }
2587
2588 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2589 return os::uncommit_memory(addr, size);
2590 }
2591
2592 // Change the page size in a given range.
2593 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2594 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2595 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2596 if (UseLargePages) {
2597 Solaris::setup_large_pages(addr, bytes, alignment_hint);
2598 }
2599 }
2600
2601 // Tell the OS to make the range local to the first-touching LWP
2602 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2603 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2604 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2605 debug_only(warning("MADV_ACCESS_LWP failed."));
2606 }
2607 }
2608
2609 // Tell the OS that this range would be accessed from different LWPs.
2610 void os::numa_make_global(char *addr, size_t bytes) {
2611 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2612 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2613 debug_only(warning("MADV_ACCESS_MANY failed."));
2614 }
2615 }
2616
2617 // Get the number of the locality groups.
2618 size_t os::numa_get_groups_num() {
2619 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2620 return n != -1 ? n : 1;
2621 }
2622
2623 // Get a list of leaf locality groups. A leaf lgroup is group that
2624 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2625 // board. An LWP is assigned to one of these groups upon creation.
2626 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2627 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2628 ids[0] = 0;
2629 return 1;
2630 }
2631 int result_size = 0, top = 1, bottom = 0, cur = 0;
2632 for (int k = 0; k < size; k++) {
2633 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2634 (Solaris::lgrp_id_t*)&ids[top], size - top);
2635 if (r == -1) {
2636 ids[0] = 0;
2637 return 1;
2638 }
2639 if (!r) {
2640 // That's a leaf node.
2641 assert(bottom <= cur, "Sanity check");
2642 // Check if the node has memory
2643 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2644 NULL, 0, LGRP_RSRC_MEM) > 0) {
2645 ids[bottom++] = ids[cur];
2646 }
2647 }
2648 top += r;
2649 cur++;
2650 }
2651 if (bottom == 0) {
2652 // Handle a situation, when the OS reports no memory available.
2653 // Assume UMA architecture.
2654 ids[0] = 0;
2655 return 1;
2656 }
2657 return bottom;
2658 }
2659
2660 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2661 bool os::numa_topology_changed() {
2662 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2663 if (is_stale != -1 && is_stale) {
2664 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2665 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2666 assert(c != 0, "Failure to initialize LGRP API");
2667 Solaris::set_lgrp_cookie(c);
2668 return true;
2669 }
2670 return false;
2671 }
2672
2673 // Get the group id of the current LWP.
2674 int os::numa_get_group_id() {
2675 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2676 if (lgrp_id == -1) {
2677 return 0;
2678 }
2679 const int size = os::numa_get_groups_num();
2680 int *ids = (int*)alloca(size * sizeof(int));
2681
2682 // Get the ids of all lgroups with memory; r is the count.
2683 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2684 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2685 if (r <= 0) {
2686 return 0;
2687 }
2688 return ids[os::random() % r];
2689 }
2690
2691 // Request information about the page.
2692 bool os::get_page_info(char *start, page_info* info) {
2693 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2694 uint64_t addr = (uintptr_t)start;
2695 uint64_t outdata[2];
2696 uint_t validity = 0;
2697
2698 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2699 return false;
2700 }
2701
2702 info->size = 0;
2703 info->lgrp_id = -1;
2704
2705 if ((validity & 1) != 0) {
2706 if ((validity & 2) != 0) {
2707 info->lgrp_id = outdata[0];
2708 }
2709 if ((validity & 4) != 0) {
2710 info->size = outdata[1];
2711 }
2712 return true;
2713 }
2714 return false;
2715 }
2716
2717 // Scan the pages from start to end until a page different than
2718 // the one described in the info parameter is encountered.
2719 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2720 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2721 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2722 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2723 uint_t validity[MAX_MEMINFO_CNT];
2724
2725 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2726 uint64_t p = (uint64_t)start;
2727 while (p < (uint64_t)end) {
2728 addrs[0] = p;
2729 size_t addrs_count = 1;
2730 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2731 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2732 addrs_count++;
2733 }
2734
2735 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2736 return NULL;
2737 }
2738
2739 size_t i = 0;
2740 for (; i < addrs_count; i++) {
2741 if ((validity[i] & 1) != 0) {
2742 if ((validity[i] & 4) != 0) {
2743 if (outdata[types * i + 1] != page_expected->size) {
2744 break;
2745 }
2746 } else
2747 if (page_expected->size != 0) {
2748 break;
2749 }
2750
2751 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2752 if (outdata[types * i] != page_expected->lgrp_id) {
2753 break;
2754 }
2755 }
2756 } else {
2757 return NULL;
2758 }
2759 }
2760
2761 if (i < addrs_count) {
2762 if ((validity[i] & 2) != 0) {
2763 page_found->lgrp_id = outdata[types * i];
2764 } else {
2765 page_found->lgrp_id = -1;
2766 }
2767 if ((validity[i] & 4) != 0) {
2768 page_found->size = outdata[types * i + 1];
2769 } else {
2770 page_found->size = 0;
2771 }
2772 return (char*)addrs[i];
2773 }
2774
2775 p = addrs[addrs_count - 1] + page_size;
2776 }
2777 return end;
2778 }
2779
2780 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2781 size_t size = bytes;
2782 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2783 // uncommitted page. Otherwise, the read/write might succeed if we
2784 // have enough swap space to back the physical page.
2785 return
2786 NULL != Solaris::mmap_chunk(addr, size,
2787 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2788 PROT_NONE);
2789 }
2790
2791 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2792 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2793
2794 if (b == MAP_FAILED) {
2795 return NULL;
2796 }
2797 return b;
2798 }
2799
2800 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) {
2801 char* addr = requested_addr;
2802 int flags = MAP_PRIVATE | MAP_NORESERVE;
2803
2804 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap");
2805
2806 if (fixed) {
2807 flags |= MAP_FIXED;
2808 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2809 flags |= MAP_ALIGN;
2810 addr = (char*) alignment_hint;
2811 }
2812
2813 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2814 // uncommitted page. Otherwise, the read/write might succeed if we
2815 // have enough swap space to back the physical page.
2816 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2817 }
2818
2819 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2820 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL));
2821
2822 guarantee(requested_addr == NULL || requested_addr == addr,
2823 "OS failed to return requested mmap address.");
2824 return addr;
2825 }
2826
2827 // Reserve memory at an arbitrary address, only if that area is
2828 // available (and not reserved for something else).
2829
2830 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2831 const int max_tries = 10;
2832 char* base[max_tries];
2833 size_t size[max_tries];
2834
2835 // Solaris adds a gap between mmap'ed regions. The size of the gap
2836 // is dependent on the requested size and the MMU. Our initial gap
2837 // value here is just a guess and will be corrected later.
2838 bool had_top_overlap = false;
2839 bool have_adjusted_gap = false;
2840 size_t gap = 0x400000;
2841
2842 // Assert only that the size is a multiple of the page size, since
2843 // that's all that mmap requires, and since that's all we really know
2844 // about at this low abstraction level. If we need higher alignment,
2845 // we can either pass an alignment to this method or verify alignment
2846 // in one of the methods further up the call chain. See bug 5044738.
2847 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2848
2849 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2850 // Give it a try, if the kernel honors the hint we can return immediately.
2851 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2852
2853 volatile int err = errno;
2854 if (addr == requested_addr) {
2855 return addr;
2856 } else if (addr != NULL) {
2857 pd_unmap_memory(addr, bytes);
2858 }
2859
2860 if (PrintMiscellaneous && Verbose) {
2861 char buf[256];
2862 buf[0] = '\0';
2863 if (addr == NULL) {
2864 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2865 }
2866 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2867 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2868 "%s", bytes, requested_addr, addr, buf);
2869 }
2870
2871 // Address hint method didn't work. Fall back to the old method.
2872 // In theory, once SNV becomes our oldest supported platform, this
2873 // code will no longer be needed.
2874 //
2875 // Repeatedly allocate blocks until the block is allocated at the
2876 // right spot. Give up after max_tries.
2877 int i;
2878 for (i = 0; i < max_tries; ++i) {
2879 base[i] = reserve_memory(bytes);
2880
2881 if (base[i] != NULL) {
2882 // Is this the block we wanted?
2883 if (base[i] == requested_addr) {
2884 size[i] = bytes;
2885 break;
2886 }
2887
2888 // check that the gap value is right
2889 if (had_top_overlap && !have_adjusted_gap) {
2890 size_t actual_gap = base[i-1] - base[i] - bytes;
2891 if (gap != actual_gap) {
2892 // adjust the gap value and retry the last 2 allocations
2893 assert(i > 0, "gap adjustment code problem");
2894 have_adjusted_gap = true; // adjust the gap only once, just in case
2895 gap = actual_gap;
2896 if (PrintMiscellaneous && Verbose) {
2897 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2898 }
2899 unmap_memory(base[i], bytes);
2900 unmap_memory(base[i-1], size[i-1]);
2901 i-=2;
2902 continue;
2903 }
2904 }
2905
2906 // Does this overlap the block we wanted? Give back the overlapped
2907 // parts and try again.
2908 //
2909 // There is still a bug in this code: if top_overlap == bytes,
2910 // the overlap is offset from requested region by the value of gap.
2911 // In this case giving back the overlapped part will not work,
2912 // because we'll give back the entire block at base[i] and
2913 // therefore the subsequent allocation will not generate a new gap.
2914 // This could be fixed with a new algorithm that used larger
2915 // or variable size chunks to find the requested region -
2916 // but such a change would introduce additional complications.
2917 // It's rare enough that the planets align for this bug,
2918 // so we'll just wait for a fix for 6204603/5003415 which
2919 // will provide a mmap flag to allow us to avoid this business.
2920
2921 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2922 if (top_overlap >= 0 && top_overlap < bytes) {
2923 had_top_overlap = true;
2924 unmap_memory(base[i], top_overlap);
2925 base[i] += top_overlap;
2926 size[i] = bytes - top_overlap;
2927 } else {
2928 size_t bottom_overlap = base[i] + bytes - requested_addr;
2929 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2930 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2931 warning("attempt_reserve_memory_at: possible alignment bug");
2932 }
2933 unmap_memory(requested_addr, bottom_overlap);
2934 size[i] = bytes - bottom_overlap;
2935 } else {
2936 size[i] = bytes;
2937 }
2938 }
2939 }
2940 }
2941
2942 // Give back the unused reserved pieces.
2943
2944 for (int j = 0; j < i; ++j) {
2945 if (base[j] != NULL) {
2946 unmap_memory(base[j], size[j]);
2947 }
2948 }
2949
2950 return (i < max_tries) ? requested_addr : NULL;
2951 }
2952
2953 bool os::pd_release_memory(char* addr, size_t bytes) {
2954 size_t size = bytes;
2955 return munmap(addr, size) == 0;
2956 }
2957
2958 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2959 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2960 "addr must be page aligned");
2961 int retVal = mprotect(addr, bytes, prot);
2962 return retVal == 0;
2963 }
2964
2965 // Protect memory (Used to pass readonly pages through
2966 // JNI GetArray<type>Elements with empty arrays.)
2967 // Also, used for serialization page and for compressed oops null pointer
2968 // checking.
2969 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2970 bool is_committed) {
2971 unsigned int p = 0;
2972 switch (prot) {
2973 case MEM_PROT_NONE: p = PROT_NONE; break;
2974 case MEM_PROT_READ: p = PROT_READ; break;
2975 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2976 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2977 default:
2978 ShouldNotReachHere();
2979 }
2980 // is_committed is unused.
2981 return solaris_mprotect(addr, bytes, p);
2982 }
2983
2984 // guard_memory and unguard_memory only happens within stack guard pages.
2985 // Since ISM pertains only to the heap, guard and unguard memory should not
2986 /// happen with an ISM region.
2987 bool os::guard_memory(char* addr, size_t bytes) {
2988 return solaris_mprotect(addr, bytes, PROT_NONE);
2989 }
2990
2991 bool os::unguard_memory(char* addr, size_t bytes) {
2992 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2993 }
2994
2995 // Large page support
2996 static size_t _large_page_size = 0;
2997
2998 // Insertion sort for small arrays (descending order).
2999 static void insertion_sort_descending(size_t* array, int len) {
3000 for (int i = 0; i < len; i++) {
3001 size_t val = array[i];
3002 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
3003 size_t tmp = array[key];
3004 array[key] = array[key - 1];
3005 array[key - 1] = tmp;
3006 }
3007 }
3008 }
3009
3010 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
3011 const unsigned int usable_count = VM_Version::page_size_count();
3012 if (usable_count == 1) {
3013 return false;
3014 }
3015
3016 // Find the right getpagesizes interface. When solaris 11 is the minimum
3017 // build platform, getpagesizes() (without the '2') can be called directly.
3018 typedef int (*gps_t)(size_t[], int);
3019 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
3020 if (gps_func == NULL) {
3021 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
3022 if (gps_func == NULL) {
3023 if (warn) {
3024 warning("MPSS is not supported by the operating system.");
3025 }
3026 return false;
3027 }
3028 }
3029
3030 // Fill the array of page sizes.
3031 int n = (*gps_func)(_page_sizes, page_sizes_max);
3032 assert(n > 0, "Solaris bug?");
3033
3034 if (n == page_sizes_max) {
3035 // Add a sentinel value (necessary only if the array was completely filled
3036 // since it is static (zeroed at initialization)).
3037 _page_sizes[--n] = 0;
3038 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
3039 }
3040 assert(_page_sizes[n] == 0, "missing sentinel");
3041 trace_page_sizes("available page sizes", _page_sizes, n);
3042
3043 if (n == 1) return false; // Only one page size available.
3044
3045 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
3046 // select up to usable_count elements. First sort the array, find the first
3047 // acceptable value, then copy the usable sizes to the top of the array and
3048 // trim the rest. Make sure to include the default page size :-).
3049 //
3050 // A better policy could get rid of the 4M limit by taking the sizes of the
3051 // important VM memory regions (java heap and possibly the code cache) into
3052 // account.
3053 insertion_sort_descending(_page_sizes, n);
3054 const size_t size_limit =
3055 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
3056 int beg;
3057 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
3058 const int end = MIN2((int)usable_count, n) - 1;
3059 for (int cur = 0; cur < end; ++cur, ++beg) {
3060 _page_sizes[cur] = _page_sizes[beg];
3061 }
3062 _page_sizes[end] = vm_page_size();
3063 _page_sizes[end + 1] = 0;
3064
3065 if (_page_sizes[end] > _page_sizes[end - 1]) {
3066 // Default page size is not the smallest; sort again.
3067 insertion_sort_descending(_page_sizes, end + 1);
3068 }
3069 *page_size = _page_sizes[0];
3070
3071 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
3072 return true;
3073 }
3074
3075 void os::large_page_init() {
3076 if (UseLargePages) {
3077 // print a warning if any large page related flag is specified on command line
3078 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3079 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3080
3081 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3082 }
3083 }
3084
3085 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3086 // Signal to OS that we want large pages for addresses
3087 // from addr, addr + bytes
3088 struct memcntl_mha mpss_struct;
3089 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3090 mpss_struct.mha_pagesize = align;
3091 mpss_struct.mha_flags = 0;
3092 // Upon successful completion, memcntl() returns 0
3093 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3094 debug_only(warning("Attempt to use MPSS failed."));
3095 return false;
3096 }
3097 return true;
3098 }
3099
3100 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3101 fatal("os::reserve_memory_special should not be called on Solaris.");
3102 return NULL;
3103 }
3104
3105 bool os::release_memory_special(char* base, size_t bytes) {
3106 fatal("os::release_memory_special should not be called on Solaris.");
3107 return false;
3108 }
3109
3110 size_t os::large_page_size() {
3111 return _large_page_size;
3112 }
3113
3114 // MPSS allows application to commit large page memory on demand; with ISM
3115 // the entire memory region must be allocated as shared memory.
3116 bool os::can_commit_large_page_memory() {
3117 return true;
3118 }
3119
3120 bool os::can_execute_large_page_memory() {
3121 return true;
3122 }
3123
3124 // Read calls from inside the vm need to perform state transitions
3125 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3126 size_t res;
3127 JavaThread* thread = (JavaThread*)Thread::current();
3128 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3129 ThreadBlockInVM tbiv(thread);
3130 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3131 return res;
3132 }
3133
3134 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3135 size_t res;
3136 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3137 "Assumed _thread_in_native");
3138 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3139 return res;
3140 }
3141
3142 void os::naked_short_sleep(jlong ms) {
3143 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3144
3145 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3146 // Solaris requires -lrt for this.
3147 usleep((ms * 1000));
3148
3149 return;
3150 }
3151
3152 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3153 void os::infinite_sleep() {
3154 while (true) { // sleep forever ...
3155 ::sleep(100); // ... 100 seconds at a time
3156 }
3157 }
3158
3159 // Used to convert frequent JVM_Yield() to nops
3160 bool os::dont_yield() {
3161 if (DontYieldALot) {
3162 static hrtime_t last_time = 0;
3163 hrtime_t diff = getTimeNanos() - last_time;
3164
3165 if (diff < DontYieldALotInterval * 1000000)
3166 return true;
3167
3168 last_time += diff;
3169
3170 return false;
3171 }
3172 else {
3173 return false;
3174 }
3175 }
3176
3177 // Caveat: Solaris os::yield() causes a thread-state transition whereas
3178 // the linux and win32 implementations do not. This should be checked.
3179
3180 void os::yield() {
3181 // Yields to all threads with same or greater priority
3182 os::sleep(Thread::current(), 0, false);
3183 }
3184
3185 // Note that yield semantics are defined by the scheduling class to which
3186 // the thread currently belongs. Typically, yield will _not yield to
3187 // other equal or higher priority threads that reside on the dispatch queues
3188 // of other CPUs.
3189
3190 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }
3191
3192 // Interface for setting lwp priorities. If we are using T2 libthread,
3193 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3194 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3195 // function is meaningless in this mode so we must adjust the real lwp's priority
3196 // The routines below implement the getting and setting of lwp priorities.
3197 //
3198 // Note: T2 is now the only supported libthread. UseBoundThreads flag is
3199 // being deprecated and all threads are now BoundThreads
3200 //
3201 // Note: There are three priority scales used on Solaris. Java priotities
3202 // which range from 1 to 10, libthread "thr_setprio" scale which range
3203 // from 0 to 127, and the current scheduling class of the process we
3204 // are running in. This is typically from -60 to +60.
3205 // The setting of the lwp priorities in done after a call to thr_setprio
3206 // so Java priorities are mapped to libthread priorities and we map from
3207 // the latter to lwp priorities. We don't keep priorities stored in
3208 // Java priorities since some of our worker threads want to set priorities
3209 // higher than all Java threads.
3210 //
3211 // For related information:
3212 // (1) man -s 2 priocntl
3213 // (2) man -s 4 priocntl
3214 // (3) man dispadmin
3215 // = librt.so
3216 // = libthread/common/rtsched.c - thrp_setlwpprio().
3217 // = ps -cL <pid> ... to validate priority.
3218 // = sched_get_priority_min and _max
3219 // pthread_create
3220 // sched_setparam
3221 // pthread_setschedparam
3222 //
3223 // Assumptions:
3224 // + We assume that all threads in the process belong to the same
3225 // scheduling class. IE. an homogenous process.
3226 // + Must be root or in IA group to change change "interactive" attribute.
3227 // Priocntl() will fail silently. The only indication of failure is when
3228 // we read-back the value and notice that it hasn't changed.
3229 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3230 // + For RT, change timeslice as well. Invariant:
3231 // constant "priority integral"
3232 // Konst == TimeSlice * (60-Priority)
3233 // Given a priority, compute appropriate timeslice.
3234 // + Higher numerical values have higher priority.
3235
3236 // sched class attributes
3237 typedef struct {
3238 int schedPolicy; // classID
3239 int maxPrio;
3240 int minPrio;
3241 } SchedInfo;
3242
3243
3244 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3245
3246 #ifdef ASSERT
3247 static int ReadBackValidate = 1;
3248 #endif
3249 static int myClass = 0;
3250 static int myMin = 0;
3251 static int myMax = 0;
3252 static int myCur = 0;
3253 static bool priocntl_enable = false;
3254
3255 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3256 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3257
3258
3259 // lwp_priocntl_init
3260 //
3261 // Try to determine the priority scale for our process.
3262 //
3263 // Return errno or 0 if OK.
3264 //
3265 static int lwp_priocntl_init() {
3266 int rslt;
3267 pcinfo_t ClassInfo;
3268 pcparms_t ParmInfo;
3269 int i;
3270
3271 if (!UseThreadPriorities) return 0;
3272
3273 // If ThreadPriorityPolicy is 1, switch tables
3274 if (ThreadPriorityPolicy == 1) {
3275 for (i = 0; i < CriticalPriority+1; i++)
3276 os::java_to_os_priority[i] = prio_policy1[i];
3277 }
3278 if (UseCriticalJavaThreadPriority) {
3279 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3280 // See set_native_priority() and set_lwp_class_and_priority().
3281 // Save original MaxPriority mapping in case attempt to
3282 // use critical priority fails.
3283 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3284 // Set negative to distinguish from other priorities
3285 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3286 }
3287
3288 // Get IDs for a set of well-known scheduling classes.
3289 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3290 // the system. We should have a loop that iterates over the
3291 // classID values, which are known to be "small" integers.
3292
3293 strcpy(ClassInfo.pc_clname, "TS");
3294 ClassInfo.pc_cid = -1;
3295 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3296 if (rslt < 0) return errno;
3297 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3298 tsLimits.schedPolicy = ClassInfo.pc_cid;
3299 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3300 tsLimits.minPrio = -tsLimits.maxPrio;
3301
3302 strcpy(ClassInfo.pc_clname, "IA");
3303 ClassInfo.pc_cid = -1;
3304 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3305 if (rslt < 0) return errno;
3306 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3307 iaLimits.schedPolicy = ClassInfo.pc_cid;
3308 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3309 iaLimits.minPrio = -iaLimits.maxPrio;
3310
3311 strcpy(ClassInfo.pc_clname, "RT");
3312 ClassInfo.pc_cid = -1;
3313 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3314 if (rslt < 0) return errno;
3315 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3316 rtLimits.schedPolicy = ClassInfo.pc_cid;
3317 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3318 rtLimits.minPrio = 0;
3319
3320 strcpy(ClassInfo.pc_clname, "FX");
3321 ClassInfo.pc_cid = -1;
3322 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3323 if (rslt < 0) return errno;
3324 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3325 fxLimits.schedPolicy = ClassInfo.pc_cid;
3326 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3327 fxLimits.minPrio = 0;
3328
3329 // Query our "current" scheduling class.
3330 // This will normally be IA, TS or, rarely, FX or RT.
3331 memset(&ParmInfo, 0, sizeof(ParmInfo));
3332 ParmInfo.pc_cid = PC_CLNULL;
3333 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3334 if (rslt < 0) return errno;
3335 myClass = ParmInfo.pc_cid;
3336
3337 // We now know our scheduling classId, get specific information
3338 // about the class.
3339 ClassInfo.pc_cid = myClass;
3340 ClassInfo.pc_clname[0] = 0;
3341 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3342 if (rslt < 0) return errno;
3343
3344 if (ThreadPriorityVerbose) {
3345 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3346 }
3347
3348 memset(&ParmInfo, 0, sizeof(pcparms_t));
3349 ParmInfo.pc_cid = PC_CLNULL;
3350 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3351 if (rslt < 0) return errno;
3352
3353 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3354 myMin = rtLimits.minPrio;
3355 myMax = rtLimits.maxPrio;
3356 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3357 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3358 myMin = iaLimits.minPrio;
3359 myMax = iaLimits.maxPrio;
3360 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3361 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3362 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3363 myMin = tsLimits.minPrio;
3364 myMax = tsLimits.maxPrio;
3365 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3366 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3367 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3368 myMin = fxLimits.minPrio;
3369 myMax = fxLimits.maxPrio;
3370 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3371 } else {
3372 // No clue - punt
3373 if (ThreadPriorityVerbose)
3374 tty->print_cr("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname);
3375 return EINVAL; // no clue, punt
3376 }
3377
3378 if (ThreadPriorityVerbose) {
3379 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3380 }
3381
3382 priocntl_enable = true; // Enable changing priorities
3383 return 0;
3384 }
3385
3386 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3387 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3388 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3389 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3390
3391
3392 // scale_to_lwp_priority
3393 //
3394 // Convert from the libthread "thr_setprio" scale to our current
3395 // lwp scheduling class scale.
3396 //
3397 static
3398 int scale_to_lwp_priority (int rMin, int rMax, int x)
3399 {
3400 int v;
3401
3402 if (x == 127) return rMax; // avoid round-down
3403 v = (((x*(rMax-rMin)))/128)+rMin;
3404 return v;
3405 }
3406
3407
3408 // set_lwp_class_and_priority
3409 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3410 int newPrio, int new_class, bool scale) {
3411 int rslt;
3412 int Actual, Expected, prv;
3413 pcparms_t ParmInfo; // for GET-SET
3414 #ifdef ASSERT
3415 pcparms_t ReadBack; // for readback
3416 #endif
3417
3418 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3419 // Query current values.
3420 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3421 // Cache "pcparms_t" in global ParmCache.
3422 // TODO: elide set-to-same-value
3423
3424 // If something went wrong on init, don't change priorities.
3425 if (!priocntl_enable) {
3426 if (ThreadPriorityVerbose)
3427 tty->print_cr("Trying to set priority but init failed, ignoring");
3428 return EINVAL;
3429 }
3430
3431 // If lwp hasn't started yet, just return
3432 // the _start routine will call us again.
3433 if (lwpid <= 0) {
3434 if (ThreadPriorityVerbose) {
3435 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3436 INTPTR_FORMAT " to %d, lwpid not set",
3437 ThreadID, newPrio);
3438 }
3439 return 0;
3440 }
3441
3442 if (ThreadPriorityVerbose) {
3443 tty->print_cr ("set_lwp_class_and_priority("
3444 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3445 ThreadID, lwpid, newPrio);
3446 }
3447
3448 memset(&ParmInfo, 0, sizeof(pcparms_t));
3449 ParmInfo.pc_cid = PC_CLNULL;
3450 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3451 if (rslt < 0) return errno;
3452
3453 int cur_class = ParmInfo.pc_cid;
3454 ParmInfo.pc_cid = (id_t)new_class;
3455
3456 if (new_class == rtLimits.schedPolicy) {
3457 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3458 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3459 rtLimits.maxPrio, newPrio)
3460 : newPrio;
3461 rtInfo->rt_tqsecs = RT_NOCHANGE;
3462 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3463 if (ThreadPriorityVerbose) {
3464 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3465 }
3466 } else if (new_class == iaLimits.schedPolicy) {
3467 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3468 int maxClamped = MIN2(iaLimits.maxPrio,
3469 cur_class == new_class
3470 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3471 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3472 maxClamped, newPrio)
3473 : newPrio;
3474 iaInfo->ia_uprilim = cur_class == new_class
3475 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3476 iaInfo->ia_mode = IA_NOCHANGE;
3477 if (ThreadPriorityVerbose) {
3478 tty->print_cr("IA: [%d...%d] %d->%d\n",
3479 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3480 }
3481 } else if (new_class == tsLimits.schedPolicy) {
3482 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3483 int maxClamped = MIN2(tsLimits.maxPrio,
3484 cur_class == new_class
3485 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3486 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3487 maxClamped, newPrio)
3488 : newPrio;
3489 tsInfo->ts_uprilim = cur_class == new_class
3490 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3491 if (ThreadPriorityVerbose) {
3492 tty->print_cr("TS: [%d...%d] %d->%d\n",
3493 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3494 }
3495 } else if (new_class == fxLimits.schedPolicy) {
3496 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3497 int maxClamped = MIN2(fxLimits.maxPrio,
3498 cur_class == new_class
3499 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3500 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3501 maxClamped, newPrio)
3502 : newPrio;
3503 fxInfo->fx_uprilim = cur_class == new_class
3504 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3505 fxInfo->fx_tqsecs = FX_NOCHANGE;
3506 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3507 if (ThreadPriorityVerbose) {
3508 tty->print_cr("FX: [%d...%d] %d->%d\n",
3509 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3510 }
3511 } else {
3512 if (ThreadPriorityVerbose) {
3513 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3514 }
3515 return EINVAL; // no clue, punt
3516 }
3517
3518 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3519 if (ThreadPriorityVerbose && rslt) {
3520 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3521 }
3522 if (rslt < 0) return errno;
3523
3524 #ifdef ASSERT
3525 // Sanity check: read back what we just attempted to set.
3526 // In theory it could have changed in the interim ...
3527 //
3528 // The priocntl system call is tricky.
3529 // Sometimes it'll validate the priority value argument and
3530 // return EINVAL if unhappy. At other times it fails silently.
3531 // Readbacks are prudent.
3532
3533 if (!ReadBackValidate) return 0;
3534
3535 memset(&ReadBack, 0, sizeof(pcparms_t));
3536 ReadBack.pc_cid = PC_CLNULL;
3537 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3538 assert(rslt >= 0, "priocntl failed");
3539 Actual = Expected = 0xBAD;
3540 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3541 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3542 Actual = RTPRI(ReadBack)->rt_pri;
3543 Expected = RTPRI(ParmInfo)->rt_pri;
3544 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3545 Actual = IAPRI(ReadBack)->ia_upri;
3546 Expected = IAPRI(ParmInfo)->ia_upri;
3547 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3548 Actual = TSPRI(ReadBack)->ts_upri;
3549 Expected = TSPRI(ParmInfo)->ts_upri;
3550 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3551 Actual = FXPRI(ReadBack)->fx_upri;
3552 Expected = FXPRI(ParmInfo)->fx_upri;
3553 } else {
3554 if (ThreadPriorityVerbose) {
3555 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3556 ParmInfo.pc_cid);
3557 }
3558 }
3559
3560 if (Actual != Expected) {
3561 if (ThreadPriorityVerbose) {
3562 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3563 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3564 }
3565 }
3566 #endif
3567
3568 return 0;
3569 }
3570
3571 // Solaris only gives access to 128 real priorities at a time,
3572 // so we expand Java's ten to fill this range. This would be better
3573 // if we dynamically adjusted relative priorities.
3574 //
3575 // The ThreadPriorityPolicy option allows us to select 2 different
3576 // priority scales.
3577 //
3578 // ThreadPriorityPolicy=0
3579 // Since the Solaris' default priority is MaximumPriority, we do not
3580 // set a priority lower than Max unless a priority lower than
3581 // NormPriority is requested.
3582 //
3583 // ThreadPriorityPolicy=1
3584 // This mode causes the priority table to get filled with
3585 // linear values. NormPriority get's mapped to 50% of the
3586 // Maximum priority an so on. This will cause VM threads
3587 // to get unfair treatment against other Solaris processes
3588 // which do not explicitly alter their thread priorities.
3589 //
3590
3591 int os::java_to_os_priority[CriticalPriority + 1] = {
3592 -99999, // 0 Entry should never be used
3593
3594 0, // 1 MinPriority
3595 32, // 2
3596 64, // 3
3597
3598 96, // 4
3599 127, // 5 NormPriority
3600 127, // 6
3601
3602 127, // 7
3603 127, // 8
3604 127, // 9 NearMaxPriority
3605
3606 127, // 10 MaxPriority
3607
3608 -criticalPrio // 11 CriticalPriority
3609 };
3610
3611 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3612 OSThread* osthread = thread->osthread();
3613
3614 // Save requested priority in case the thread hasn't been started
3615 osthread->set_native_priority(newpri);
3616
3617 // Check for critical priority request
3618 bool fxcritical = false;
3619 if (newpri == -criticalPrio) {
3620 fxcritical = true;
3621 newpri = criticalPrio;
3622 }
3623
3624 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3625 if (!UseThreadPriorities) return OS_OK;
3626
3627 int status = 0;
3628
3629 if (!fxcritical) {
3630 // Use thr_setprio only if we have a priority that thr_setprio understands
3631 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3632 }
3633
3634 int lwp_status =
3635 set_lwp_class_and_priority(osthread->thread_id(),
3636 osthread->lwp_id(),
3637 newpri,
3638 fxcritical ? fxLimits.schedPolicy : myClass,
3639 !fxcritical);
3640 if (lwp_status != 0 && fxcritical) {
3641 // Try again, this time without changing the scheduling class
3642 newpri = java_MaxPriority_to_os_priority;
3643 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3644 osthread->lwp_id(),
3645 newpri, myClass, false);
3646 }
3647 status |= lwp_status;
3648 return (status == 0) ? OS_OK : OS_ERR;
3649 }
3650
3651
3652 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3653 int p;
3654 if (!UseThreadPriorities) {
3655 *priority_ptr = NormalPriority;
3656 return OS_OK;
3657 }
3658 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3659 if (status != 0) {
3660 return OS_ERR;
3661 }
3662 *priority_ptr = p;
3663 return OS_OK;
3664 }
3665
3666
3667 // Hint to the underlying OS that a task switch would not be good.
3668 // Void return because it's a hint and can fail.
3669 void os::hint_no_preempt() {
3670 schedctl_start(schedctl_init());
3671 }
3672
3673 static void resume_clear_context(OSThread *osthread) {
3674 osthread->set_ucontext(NULL);
3675 }
3676
3677 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3678 osthread->set_ucontext(context);
3679 }
3680
3681 static Semaphore sr_semaphore;
3682
3683 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3684 // Save and restore errno to avoid confusing native code with EINTR
3685 // after sigsuspend.
3686 int old_errno = errno;
3687
3688 OSThread* osthread = thread->osthread();
3689 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3690
3691 os::SuspendResume::State current = osthread->sr.state();
3692 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3693 suspend_save_context(osthread, uc);
3694
3695 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3696 os::SuspendResume::State state = osthread->sr.suspended();
3697 if (state == os::SuspendResume::SR_SUSPENDED) {
3698 sigset_t suspend_set; // signals for sigsuspend()
3699
3700 // get current set of blocked signals and unblock resume signal
3701 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3702 sigdelset(&suspend_set, os::Solaris::SIGasync());
3703
3704 sr_semaphore.signal();
3705 // wait here until we are resumed
3706 while (1) {
3707 sigsuspend(&suspend_set);
3708
3709 os::SuspendResume::State result = osthread->sr.running();
3710 if (result == os::SuspendResume::SR_RUNNING) {
3711 sr_semaphore.signal();
3712 break;
3713 }
3714 }
3715
3716 } else if (state == os::SuspendResume::SR_RUNNING) {
3717 // request was cancelled, continue
3718 } else {
3719 ShouldNotReachHere();
3720 }
3721
3722 resume_clear_context(osthread);
3723 } else if (current == os::SuspendResume::SR_RUNNING) {
3724 // request was cancelled, continue
3725 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3726 // ignore
3727 } else {
3728 // ignore
3729 }
3730
3731 errno = old_errno;
3732 }
3733
3734 void os::print_statistics() {
3735 }
3736
3737 int os::message_box(const char* title, const char* message) {
3738 int i;
3739 fdStream err(defaultStream::error_fd());
3740 for (i = 0; i < 78; i++) err.print_raw("=");
3741 err.cr();
3742 err.print_raw_cr(title);
3743 for (i = 0; i < 78; i++) err.print_raw("-");
3744 err.cr();
3745 err.print_raw_cr(message);
3746 for (i = 0; i < 78; i++) err.print_raw("=");
3747 err.cr();
3748
3749 char buf[16];
3750 // Prevent process from exiting upon "read error" without consuming all CPU
3751 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3752
3753 return buf[0] == 'y' || buf[0] == 'Y';
3754 }
3755
3756 static int sr_notify(OSThread* osthread) {
3757 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3758 assert_status(status == 0, status, "thr_kill");
3759 return status;
3760 }
3761
3762 // "Randomly" selected value for how long we want to spin
3763 // before bailing out on suspending a thread, also how often
3764 // we send a signal to a thread we want to resume
3765 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3766 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3767
3768 static bool do_suspend(OSThread* osthread) {
3769 assert(osthread->sr.is_running(), "thread should be running");
3770 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3771
3772 // mark as suspended and send signal
3773 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3774 // failed to switch, state wasn't running?
3775 ShouldNotReachHere();
3776 return false;
3777 }
3778
3779 if (sr_notify(osthread) != 0) {
3780 ShouldNotReachHere();
3781 }
3782
3783 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3784 while (true) {
3785 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3786 break;
3787 } else {
3788 // timeout
3789 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3790 if (cancelled == os::SuspendResume::SR_RUNNING) {
3791 return false;
3792 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3793 // make sure that we consume the signal on the semaphore as well
3794 sr_semaphore.wait();
3795 break;
3796 } else {
3797 ShouldNotReachHere();
3798 return false;
3799 }
3800 }
3801 }
3802
3803 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3804 return true;
3805 }
3806
3807 static void do_resume(OSThread* osthread) {
3808 assert(osthread->sr.is_suspended(), "thread should be suspended");
3809 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3810
3811 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3812 // failed to switch to WAKEUP_REQUEST
3813 ShouldNotReachHere();
3814 return;
3815 }
3816
3817 while (true) {
3818 if (sr_notify(osthread) == 0) {
3819 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3820 if (osthread->sr.is_running()) {
3821 return;
3822 }
3823 }
3824 } else {
3825 ShouldNotReachHere();
3826 }
3827 }
3828
3829 guarantee(osthread->sr.is_running(), "Must be running!");
3830 }
3831
3832 void os::SuspendedThreadTask::internal_do_task() {
3833 if (do_suspend(_thread->osthread())) {
3834 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3835 do_task(context);
3836 do_resume(_thread->osthread());
3837 }
3838 }
3839
3840 class PcFetcher : public os::SuspendedThreadTask {
3841 public:
3842 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3843 ExtendedPC result();
3844 protected:
3845 void do_task(const os::SuspendedThreadTaskContext& context);
3846 private:
3847 ExtendedPC _epc;
3848 };
3849
3850 ExtendedPC PcFetcher::result() {
3851 guarantee(is_done(), "task is not done yet.");
3852 return _epc;
3853 }
3854
3855 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3856 Thread* thread = context.thread();
3857 OSThread* osthread = thread->osthread();
3858 if (osthread->ucontext() != NULL) {
3859 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
3860 } else {
3861 // NULL context is unexpected, double-check this is the VMThread
3862 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3863 }
3864 }
3865
3866 // A lightweight implementation that does not suspend the target thread and
3867 // thus returns only a hint. Used for profiling only!
3868 ExtendedPC os::get_thread_pc(Thread* thread) {
3869 // Make sure that it is called by the watcher and the Threads lock is owned.
3870 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3871 // For now, is only used to profile the VM Thread
3872 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3873 PcFetcher fetcher(thread);
3874 fetcher.run();
3875 return fetcher.result();
3876 }
3877
3878
3879 // This does not do anything on Solaris. This is basically a hook for being
3880 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3881 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
3882 f(value, method, args, thread);
3883 }
3884
3885 // This routine may be used by user applications as a "hook" to catch signals.
3886 // The user-defined signal handler must pass unrecognized signals to this
3887 // routine, and if it returns true (non-zero), then the signal handler must
3888 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3889 // routine will never retun false (zero), but instead will execute a VM panic
3890 // routine kill the process.
3891 //
3892 // If this routine returns false, it is OK to call it again. This allows
3893 // the user-defined signal handler to perform checks either before or after
3894 // the VM performs its own checks. Naturally, the user code would be making
3895 // a serious error if it tried to handle an exception (such as a null check
3896 // or breakpoint) that the VM was generating for its own correct operation.
3897 //
3898 // This routine may recognize any of the following kinds of signals:
3899 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3900 // os::Solaris::SIGasync
3901 // It should be consulted by handlers for any of those signals.
3902 // It explicitly does not recognize os::Solaris::SIGinterrupt
3903 //
3904 // The caller of this routine must pass in the three arguments supplied
3905 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3906 // field of the structure passed to sigaction(). This routine assumes that
3907 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3908 //
3909 // Note that the VM will print warnings if it detects conflicting signal
3910 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3911 //
3912 extern "C" JNIEXPORT int
3913 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
3914 int abort_if_unrecognized);
3915
3916
3917 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3918 int orig_errno = errno; // Preserve errno value over signal handler.
3919 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3920 errno = orig_errno;
3921 }
3922
3923 /* Do not delete - if guarantee is ever removed, a signal handler (even empty)
3924 is needed to provoke threads blocked on IO to return an EINTR
3925 Note: this explicitly does NOT call JVM_handle_solaris_signal and
3926 does NOT participate in signal chaining due to requirement for
3927 NOT setting SA_RESTART to make EINTR work. */
3928 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) {
3929 if (UseSignalChaining) {
3930 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig);
3931 if (actp && actp->sa_handler) {
3932 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs");
3933 }
3934 }
3935 }
3936
3937 // This boolean allows users to forward their own non-matching signals
3938 // to JVM_handle_solaris_signal, harmlessly.
3939 bool os::Solaris::signal_handlers_are_installed = false;
3940
3941 // For signal-chaining
3942 bool os::Solaris::libjsig_is_loaded = false;
3943 typedef struct sigaction *(*get_signal_t)(int);
3944 get_signal_t os::Solaris::get_signal_action = NULL;
3945
3946 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3947 struct sigaction *actp = NULL;
3948
3949 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3950 // Retrieve the old signal handler from libjsig
3951 actp = (*get_signal_action)(sig);
3952 }
3953 if (actp == NULL) {
3954 // Retrieve the preinstalled signal handler from jvm
3955 actp = get_preinstalled_handler(sig);
3956 }
3957
3958 return actp;
3959 }
3960
3961 static bool call_chained_handler(struct sigaction *actp, int sig,
3962 siginfo_t *siginfo, void *context) {
3963 // Call the old signal handler
3964 if (actp->sa_handler == SIG_DFL) {
3965 // It's more reasonable to let jvm treat it as an unexpected exception
3966 // instead of taking the default action.
3967 return false;
3968 } else if (actp->sa_handler != SIG_IGN) {
3969 if ((actp->sa_flags & SA_NODEFER) == 0) {
3970 // automaticlly block the signal
3971 sigaddset(&(actp->sa_mask), sig);
3972 }
3973
3974 sa_handler_t hand;
3975 sa_sigaction_t sa;
3976 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3977 // retrieve the chained handler
3978 if (siginfo_flag_set) {
3979 sa = actp->sa_sigaction;
3980 } else {
3981 hand = actp->sa_handler;
3982 }
3983
3984 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3985 actp->sa_handler = SIG_DFL;
3986 }
3987
3988 // try to honor the signal mask
3989 sigset_t oset;
3990 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3991
3992 // call into the chained handler
3993 if (siginfo_flag_set) {
3994 (*sa)(sig, siginfo, context);
3995 } else {
3996 (*hand)(sig);
3997 }
3998
3999 // restore the signal mask
4000 thr_sigsetmask(SIG_SETMASK, &oset, 0);
4001 }
4002 // Tell jvm's signal handler the signal is taken care of.
4003 return true;
4004 }
4005
4006 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
4007 bool chained = false;
4008 // signal-chaining
4009 if (UseSignalChaining) {
4010 struct sigaction *actp = get_chained_signal_action(sig);
4011 if (actp != NULL) {
4012 chained = call_chained_handler(actp, sig, siginfo, context);
4013 }
4014 }
4015 return chained;
4016 }
4017
4018 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
4019 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4020 if (preinstalled_sigs[sig] != 0) {
4021 return &chainedsigactions[sig];
4022 }
4023 return NULL;
4024 }
4025
4026 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
4027
4028 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
4029 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized");
4030 chainedsigactions[sig] = oldAct;
4031 preinstalled_sigs[sig] = 1;
4032 }
4033
4034 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) {
4035 // Check for overwrite.
4036 struct sigaction oldAct;
4037 sigaction(sig, (struct sigaction*)NULL, &oldAct);
4038 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4039 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4040 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
4041 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
4042 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
4043 if (AllowUserSignalHandlers || !set_installed) {
4044 // Do not overwrite; user takes responsibility to forward to us.
4045 return;
4046 } else if (UseSignalChaining) {
4047 if (oktochain) {
4048 // save the old handler in jvm
4049 save_preinstalled_handler(sig, oldAct);
4050 } else {
4051 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
4052 }
4053 // libjsig also interposes the sigaction() call below and saves the
4054 // old sigaction on it own.
4055 } else {
4056 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
4057 "%#lx for signal %d.", (long)oldhand, sig));
4058 }
4059 }
4060
4061 struct sigaction sigAct;
4062 sigfillset(&(sigAct.sa_mask));
4063 sigAct.sa_handler = SIG_DFL;
4064
4065 sigAct.sa_sigaction = signalHandler;
4066 // Handle SIGSEGV on alternate signal stack if
4067 // not using stack banging
4068 if (!UseStackBanging && sig == SIGSEGV) {
4069 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4070 // Interruptible i/o requires SA_RESTART cleared so EINTR
4071 // is returned instead of restarting system calls
4072 } else if (sig == os::Solaris::SIGinterrupt()) {
4073 sigemptyset(&sigAct.sa_mask);
4074 sigAct.sa_handler = NULL;
4075 sigAct.sa_flags = SA_SIGINFO;
4076 sigAct.sa_sigaction = sigINTRHandler;
4077 } else {
4078 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4079 }
4080 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4081
4082 sigaction(sig, &sigAct, &oldAct);
4083
4084 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4085 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4086 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4087 }
4088
4089
4090 #define DO_SIGNAL_CHECK(sig) \
4091 if (!sigismember(&check_signal_done, sig)) \
4092 os::Solaris::check_signal_handler(sig)
4093
4094 // This method is a periodic task to check for misbehaving JNI applications
4095 // under CheckJNI, we can add any periodic checks here
4096
4097 void os::run_periodic_checks() {
4098 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4099 // thereby preventing a NULL checks.
4100 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
4101
4102 if (check_signals == false) return;
4103
4104 // SEGV and BUS if overridden could potentially prevent
4105 // generation of hs*.log in the event of a crash, debugging
4106 // such a case can be very challenging, so we absolutely
4107 // check for the following for a good measure:
4108 DO_SIGNAL_CHECK(SIGSEGV);
4109 DO_SIGNAL_CHECK(SIGILL);
4110 DO_SIGNAL_CHECK(SIGFPE);
4111 DO_SIGNAL_CHECK(SIGBUS);
4112 DO_SIGNAL_CHECK(SIGPIPE);
4113 DO_SIGNAL_CHECK(SIGXFSZ);
4114
4115 // ReduceSignalUsage allows the user to override these handlers
4116 // see comments at the very top and jvm_solaris.h
4117 if (!ReduceSignalUsage) {
4118 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4119 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4120 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4121 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4122 }
4123
4124 // See comments above for using JVM1/JVM2 and UseAltSigs
4125 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt());
4126 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4127
4128 }
4129
4130 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4131
4132 static os_sigaction_t os_sigaction = NULL;
4133
4134 void os::Solaris::check_signal_handler(int sig) {
4135 char buf[O_BUFLEN];
4136 address jvmHandler = NULL;
4137
4138 struct sigaction act;
4139 if (os_sigaction == NULL) {
4140 // only trust the default sigaction, in case it has been interposed
4141 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4142 if (os_sigaction == NULL) return;
4143 }
4144
4145 os_sigaction(sig, (struct sigaction*)NULL, &act);
4146
4147 address thisHandler = (act.sa_flags & SA_SIGINFO)
4148 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4149 : CAST_FROM_FN_PTR(address, act.sa_handler);
4150
4151
4152 switch (sig) {
4153 case SIGSEGV:
4154 case SIGBUS:
4155 case SIGFPE:
4156 case SIGPIPE:
4157 case SIGXFSZ:
4158 case SIGILL:
4159 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4160 break;
4161
4162 case SHUTDOWN1_SIGNAL:
4163 case SHUTDOWN2_SIGNAL:
4164 case SHUTDOWN3_SIGNAL:
4165 case BREAK_SIGNAL:
4166 jvmHandler = (address)user_handler();
4167 break;
4168
4169 default:
4170 int intrsig = os::Solaris::SIGinterrupt();
4171 int asynsig = os::Solaris::SIGasync();
4172
4173 if (sig == intrsig) {
4174 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler);
4175 } else if (sig == asynsig) {
4176 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4177 } else {
4178 return;
4179 }
4180 break;
4181 }
4182
4183
4184 if (thisHandler != jvmHandler) {
4185 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4186 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4187 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4188 // No need to check this sig any longer
4189 sigaddset(&check_signal_done, sig);
4190 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4191 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4192 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4193 exception_name(sig, buf, O_BUFLEN));
4194 }
4195 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4196 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4197 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4198 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4199 // No need to check this sig any longer
4200 sigaddset(&check_signal_done, sig);
4201 }
4202
4203 // Print all the signal handler state
4204 if (sigismember(&check_signal_done, sig)) {
4205 print_signal_handlers(tty, buf, O_BUFLEN);
4206 }
4207
4208 }
4209
4210 void os::Solaris::install_signal_handlers() {
4211 bool libjsigdone = false;
4212 signal_handlers_are_installed = true;
4213
4214 // signal-chaining
4215 typedef void (*signal_setting_t)();
4216 signal_setting_t begin_signal_setting = NULL;
4217 signal_setting_t end_signal_setting = NULL;
4218 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4219 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4220 if (begin_signal_setting != NULL) {
4221 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4222 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4223 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4224 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4225 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4226 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4227 libjsig_is_loaded = true;
4228 if (os::Solaris::get_libjsig_version != NULL) {
4229 libjsigversion = (*os::Solaris::get_libjsig_version)();
4230 }
4231 assert(UseSignalChaining, "should enable signal-chaining");
4232 }
4233 if (libjsig_is_loaded) {
4234 // Tell libjsig jvm is setting signal handlers
4235 (*begin_signal_setting)();
4236 }
4237
4238 set_signal_handler(SIGSEGV, true, true);
4239 set_signal_handler(SIGPIPE, true, true);
4240 set_signal_handler(SIGXFSZ, true, true);
4241 set_signal_handler(SIGBUS, true, true);
4242 set_signal_handler(SIGILL, true, true);
4243 set_signal_handler(SIGFPE, true, true);
4244
4245
4246 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4247
4248 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4249 // can not register overridable signals which might be > 32
4250 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4251 // Tell libjsig jvm has finished setting signal handlers
4252 (*end_signal_setting)();
4253 libjsigdone = true;
4254 }
4255 }
4256
4257 // Never ok to chain our SIGinterrupt
4258 set_signal_handler(os::Solaris::SIGinterrupt(), true, false);
4259 set_signal_handler(os::Solaris::SIGasync(), true, true);
4260
4261 if (libjsig_is_loaded && !libjsigdone) {
4262 // Tell libjsig jvm finishes setting signal handlers
4263 (*end_signal_setting)();
4264 }
4265
4266 // We don't activate signal checker if libjsig is in place, we trust ourselves
4267 // and if UserSignalHandler is installed all bets are off.
4268 // Log that signal checking is off only if -verbose:jni is specified.
4269 if (CheckJNICalls) {
4270 if (libjsig_is_loaded) {
4271 if (PrintJNIResolving) {
4272 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4273 }
4274 check_signals = false;
4275 }
4276 if (AllowUserSignalHandlers) {
4277 if (PrintJNIResolving) {
4278 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4279 }
4280 check_signals = false;
4281 }
4282 }
4283 }
4284
4285
4286 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...);
4287
4288 const char * signames[] = {
4289 "SIG0",
4290 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4291 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4292 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4293 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4294 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4295 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4296 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4297 "SIGCANCEL", "SIGLOST"
4298 };
4299
4300 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4301 if (0 < exception_code && exception_code <= SIGRTMAX) {
4302 // signal
4303 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4304 jio_snprintf(buf, size, "%s", signames[exception_code]);
4305 } else {
4306 jio_snprintf(buf, size, "SIG%d", exception_code);
4307 }
4308 return buf;
4309 } else {
4310 return NULL;
4311 }
4312 }
4313
4314 // (Static) wrapper for getisax(2) call.
4315 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4316
4317 // (Static) wrappers for the liblgrp API
4318 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4319 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4320 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4321 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4322 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4323 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4324 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4325 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4326 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4327
4328 // (Static) wrapper for meminfo() call.
4329 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4330
4331 static address resolve_symbol_lazy(const char* name) {
4332 address addr = (address) dlsym(RTLD_DEFAULT, name);
4333 if (addr == NULL) {
4334 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4335 addr = (address) dlsym(RTLD_NEXT, name);
4336 }
4337 return addr;
4338 }
4339
4340 static address resolve_symbol(const char* name) {
4341 address addr = resolve_symbol_lazy(name);
4342 if (addr == NULL) {
4343 fatal(dlerror());
4344 }
4345 return addr;
4346 }
4347
4348 void os::Solaris::libthread_init() {
4349 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4350
4351 lwp_priocntl_init();
4352
4353 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4354 if (func == NULL) {
4355 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4356 // Guarantee that this VM is running on an new enough OS (5.6 or
4357 // later) that it will have a new enough libthread.so.
4358 guarantee(func != NULL, "libthread.so is too old.");
4359 }
4360
4361 int size;
4362 void (*handler_info_func)(address *, int *);
4363 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4364 handler_info_func(&handler_start, &size);
4365 handler_end = handler_start + size;
4366 }
4367
4368
4369 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4370 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4371 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4372 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4373 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4374 int os::Solaris::_mutex_scope = USYNC_THREAD;
4375
4376 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4377 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4378 int_fnP_cond_tP os::Solaris::_cond_signal;
4379 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4380 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4381 int_fnP_cond_tP os::Solaris::_cond_destroy;
4382 int os::Solaris::_cond_scope = USYNC_THREAD;
4383
4384 void os::Solaris::synchronization_init() {
4385 if (UseLWPSynchronization) {
4386 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4387 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4388 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4389 os::Solaris::set_mutex_init(lwp_mutex_init);
4390 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4391 os::Solaris::set_mutex_scope(USYNC_THREAD);
4392
4393 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4394 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4395 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4396 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4397 os::Solaris::set_cond_init(lwp_cond_init);
4398 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4399 os::Solaris::set_cond_scope(USYNC_THREAD);
4400 }
4401 else {
4402 os::Solaris::set_mutex_scope(USYNC_THREAD);
4403 os::Solaris::set_cond_scope(USYNC_THREAD);
4404
4405 if (UsePthreads) {
4406 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4407 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4408 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4409 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4410 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4411
4412 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4413 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4414 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4415 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4416 os::Solaris::set_cond_init(pthread_cond_default_init);
4417 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4418 }
4419 else {
4420 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4421 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4422 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4423 os::Solaris::set_mutex_init(::mutex_init);
4424 os::Solaris::set_mutex_destroy(::mutex_destroy);
4425
4426 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4427 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4428 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4429 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4430 os::Solaris::set_cond_init(::cond_init);
4431 os::Solaris::set_cond_destroy(::cond_destroy);
4432 }
4433 }
4434 }
4435
4436 bool os::Solaris::liblgrp_init() {
4437 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4438 if (handle != NULL) {
4439 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4440 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4441 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4442 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4443 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4444 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4445 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4446 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4447 dlsym(handle, "lgrp_cookie_stale")));
4448
4449 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4450 set_lgrp_cookie(c);
4451 return true;
4452 }
4453 return false;
4454 }
4455
4456 void os::Solaris::misc_sym_init() {
4457 address func;
4458
4459 // getisax
4460 func = resolve_symbol_lazy("getisax");
4461 if (func != NULL) {
4462 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4463 }
4464
4465 // meminfo
4466 func = resolve_symbol_lazy("meminfo");
4467 if (func != NULL) {
4468 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4469 }
4470 }
4471
4472 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4473 assert(_getisax != NULL, "_getisax not set");
4474 return _getisax(array, n);
4475 }
4476
4477 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4478 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4479 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4480
4481 void init_pset_getloadavg_ptr(void) {
4482 pset_getloadavg_ptr =
4483 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4484 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4485 warning("pset_getloadavg function not found");
4486 }
4487 }
4488
4489 int os::Solaris::_dev_zero_fd = -1;
4490
4491 // this is called _before_ the global arguments have been parsed
4492 void os::init(void) {
4493 _initial_pid = getpid();
4494
4495 max_hrtime = first_hrtime = gethrtime();
4496
4497 init_random(1234567);
4498
4499 page_size = sysconf(_SC_PAGESIZE);
4500 if (page_size == -1)
4501 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)",
4502 strerror(errno)));
4503 init_page_sizes((size_t) page_size);
4504
4505 Solaris::initialize_system_info();
4506
4507 // Initialize misc. symbols as soon as possible, so we can use them
4508 // if we need them.
4509 Solaris::misc_sym_init();
4510
4511 int fd = ::open("/dev/zero", O_RDWR);
4512 if (fd < 0) {
4513 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno)));
4514 } else {
4515 Solaris::set_dev_zero_fd(fd);
4516
4517 // Close on exec, child won't inherit.
4518 fcntl(fd, F_SETFD, FD_CLOEXEC);
4519 }
4520
4521 clock_tics_per_sec = CLK_TCK;
4522
4523 // check if dladdr1() exists; dladdr1 can provide more information than
4524 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4525 // and is available on linker patches for 5.7 and 5.8.
4526 // libdl.so must have been loaded, this call is just an entry lookup
4527 void * hdl = dlopen("libdl.so", RTLD_NOW);
4528 if (hdl)
4529 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4530
4531 // (Solaris only) this switches to calls that actually do locking.
4532 ThreadCritical::initialize();
4533
4534 main_thread = thr_self();
4535
4536 // Constant minimum stack size allowed. It must be at least
4537 // the minimum of what the OS supports (thr_min_stack()), and
4538 // enough to allow the thread to get to user bytecode execution.
4539 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4540 // If the pagesize of the VM is greater than 8K determine the appropriate
4541 // number of initial guard pages. The user can change this with the
4542 // command line arguments, if needed.
4543 if (vm_page_size() > 8*K) {
4544 StackYellowPages = 1;
4545 StackRedPages = 1;
4546 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4547 }
4548 }
4549
4550 // To install functions for atexit system call
4551 extern "C" {
4552 static void perfMemory_exit_helper() {
4553 perfMemory_exit();
4554 }
4555 }
4556
4557 // this is called _after_ the global arguments have been parsed
4558 jint os::init_2(void) {
4559 // try to enable extended file IO ASAP, see 6431278
4560 os::Solaris::try_enable_extended_io();
4561
4562 // Allocate a single page and mark it as readable for safepoint polling. Also
4563 // use this first mmap call to check support for MAP_ALIGN.
4564 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4565 page_size,
4566 MAP_PRIVATE | MAP_ALIGN,
4567 PROT_READ);
4568 if (polling_page == NULL) {
4569 has_map_align = false;
4570 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4571 PROT_READ);
4572 }
4573
4574 os::set_polling_page(polling_page);
4575
4576 #ifndef PRODUCT
4577 if (Verbose && PrintMiscellaneous)
4578 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page);
4579 #endif
4580
4581 if (!UseMembar) {
4582 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4583 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4584 os::set_memory_serialize_page(mem_serialize_page);
4585
4586 #ifndef PRODUCT
4587 if (Verbose && PrintMiscellaneous)
4588 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
4589 #endif
4590 }
4591
4592 // Check minimum allowable stack size for thread creation and to initialize
4593 // the java system classes, including StackOverflowError - depends on page
4594 // size. Add a page for compiler2 recursion in main thread.
4595 // Add in 2*BytesPerWord times page size to account for VM stack during
4596 // class initialization depending on 32 or 64 bit VM.
4597 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4598 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4599 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4600
4601 size_t threadStackSizeInBytes = ThreadStackSize * K;
4602 if (threadStackSizeInBytes != 0 &&
4603 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4604 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4605 os::Solaris::min_stack_allowed/K);
4606 return JNI_ERR;
4607 }
4608
4609 // For 64kbps there will be a 64kb page size, which makes
4610 // the usable default stack size quite a bit less. Increase the
4611 // stack for 64kb (or any > than 8kb) pages, this increases
4612 // virtual memory fragmentation (since we're not creating the
4613 // stack on a power of 2 boundary. The real fix for this
4614 // should be to fix the guard page mechanism.
4615
4616 if (vm_page_size() > 8*K) {
4617 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4618 ? threadStackSizeInBytes +
4619 ((StackYellowPages + StackRedPages) * vm_page_size())
4620 : 0;
4621 ThreadStackSize = threadStackSizeInBytes/K;
4622 }
4623
4624 // Make the stack size a multiple of the page size so that
4625 // the yellow/red zones can be guarded.
4626 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4627 vm_page_size()));
4628
4629 Solaris::libthread_init();
4630
4631 if (UseNUMA) {
4632 if (!Solaris::liblgrp_init()) {
4633 UseNUMA = false;
4634 } else {
4635 size_t lgrp_limit = os::numa_get_groups_num();
4636 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4637 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4638 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal);
4639 if (lgrp_num < 2) {
4640 // There's only one locality group, disable NUMA.
4641 UseNUMA = false;
4642 }
4643 }
4644 if (!UseNUMA && ForceNUMA) {
4645 UseNUMA = true;
4646 }
4647 }
4648
4649 Solaris::signal_sets_init();
4650 Solaris::init_signal_mem();
4651 Solaris::install_signal_handlers();
4652
4653 if (libjsigversion < JSIG_VERSION_1_4_1) {
4654 Maxlibjsigsigs = OLDMAXSIGNUM;
4655 }
4656
4657 // initialize synchronization primitives to use either thread or
4658 // lwp synchronization (controlled by UseLWPSynchronization)
4659 Solaris::synchronization_init();
4660
4661 if (MaxFDLimit) {
4662 // set the number of file descriptors to max. print out error
4663 // if getrlimit/setrlimit fails but continue regardless.
4664 struct rlimit nbr_files;
4665 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4666 if (status != 0) {
4667 if (PrintMiscellaneous && (Verbose || WizardMode))
4668 perror("os::init_2 getrlimit failed");
4669 } else {
4670 nbr_files.rlim_cur = nbr_files.rlim_max;
4671 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4672 if (status != 0) {
4673 if (PrintMiscellaneous && (Verbose || WizardMode))
4674 perror("os::init_2 setrlimit failed");
4675 }
4676 }
4677 }
4678
4679 // Calculate theoretical max. size of Threads to guard gainst
4680 // artifical out-of-memory situations, where all available address-
4681 // space has been reserved by thread stacks. Default stack size is 1Mb.
4682 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4683 JavaThread::stack_size_at_create() : (1*K*K);
4684 assert(pre_thread_stack_size != 0, "Must have a stack");
4685 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4686 // we should start doing Virtual Memory banging. Currently when the threads will
4687 // have used all but 200Mb of space.
4688 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4689 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4690
4691 // at-exit methods are called in the reverse order of their registration.
4692 // In Solaris 7 and earlier, atexit functions are called on return from
4693 // main or as a result of a call to exit(3C). There can be only 32 of
4694 // these functions registered and atexit() does not set errno. In Solaris
4695 // 8 and later, there is no limit to the number of functions registered
4696 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4697 // functions are called upon dlclose(3DL) in addition to return from main
4698 // and exit(3C).
4699
4700 if (PerfAllowAtExitRegistration) {
4701 // only register atexit functions if PerfAllowAtExitRegistration is set.
4702 // atexit functions can be delayed until process exit time, which
4703 // can be problematic for embedded VM situations. Embedded VMs should
4704 // call DestroyJavaVM() to assure that VM resources are released.
4705
4706 // note: perfMemory_exit_helper atexit function may be removed in
4707 // the future if the appropriate cleanup code can be added to the
4708 // VM_Exit VMOperation's doit method.
4709 if (atexit(perfMemory_exit_helper) != 0) {
4710 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4711 }
4712 }
4713
4714 // Init pset_loadavg function pointer
4715 init_pset_getloadavg_ptr();
4716
4717 return JNI_OK;
4718 }
4719
4720 void os::init_3(void) {
4721 return;
4722 }
4723
4724 // Mark the polling page as unreadable
4725 void os::make_polling_page_unreadable(void) {
4726 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0)
4727 fatal("Could not disable polling page");
4728 };
4729
4730 // Mark the polling page as readable
4731 void os::make_polling_page_readable(void) {
4732 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0)
4733 fatal("Could not enable polling page");
4734 };
4735
4736 // OS interface.
4737
4738 bool os::check_heap(bool force) { return true; }
4739
4740 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr);
4741 static vsnprintf_t sol_vsnprintf = NULL;
4742
4743 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) {
4744 if (!sol_vsnprintf) {
4745 //search for the named symbol in the objects that were loaded after libjvm
4746 void* where = RTLD_NEXT;
4747 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
4748 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
4749 if (!sol_vsnprintf){
4750 //search for the named symbol in the objects that were loaded before libjvm
4751 where = RTLD_DEFAULT;
4752 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL)
4753 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf"));
4754 assert(sol_vsnprintf != NULL, "vsnprintf not found");
4755 }
4756 }
4757 return (*sol_vsnprintf)(buf, count, fmt, argptr);
4758 }
4759
4760
4761 // Is a (classpath) directory empty?
4762 bool os::dir_is_empty(const char* path) {
4763 DIR *dir = NULL;
4764 struct dirent *ptr;
4765
4766 dir = opendir(path);
4767 if (dir == NULL) return true;
4768
4769 /* Scan the directory */
4770 bool result = true;
4771 char buf[sizeof(struct dirent) + MAX_PATH];
4772 struct dirent *dbuf = (struct dirent *) buf;
4773 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4774 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4775 result = false;
4776 }
4777 }
4778 closedir(dir);
4779 return result;
4780 }
4781
4782 // This code originates from JDK's sysOpen and open64_w
4783 // from src/solaris/hpi/src/system_md.c
4784
4785 #ifndef O_DELETE
4786 #define O_DELETE 0x10000
4787 #endif
4788
4789 // Open a file. Unlink the file immediately after open returns
4790 // if the specified oflag has the O_DELETE flag set.
4791 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
4792
4793 int os::open(const char *path, int oflag, int mode) {
4794 if (strlen(path) > MAX_PATH - 1) {
4795 errno = ENAMETOOLONG;
4796 return -1;
4797 }
4798 int fd;
4799 int o_delete = (oflag & O_DELETE);
4800 oflag = oflag & ~O_DELETE;
4801
4802 fd = ::open64(path, oflag, mode);
4803 if (fd == -1) return -1;
4804
4805 //If the open succeeded, the file might still be a directory
4806 {
4807 struct stat64 buf64;
4808 int ret = ::fstat64(fd, &buf64);
4809 int st_mode = buf64.st_mode;
4810
4811 if (ret != -1) {
4812 if ((st_mode & S_IFMT) == S_IFDIR) {
4813 errno = EISDIR;
4814 ::close(fd);
4815 return -1;
4816 }
4817 } else {
4818 ::close(fd);
4819 return -1;
4820 }
4821 }
4822 /*
4823 * 32-bit Solaris systems suffer from:
4824 *
4825 * - an historical default soft limit of 256 per-process file
4826 * descriptors that is too low for many Java programs.
4827 *
4828 * - a design flaw where file descriptors created using stdio
4829 * fopen must be less than 256, _even_ when the first limit above
4830 * has been raised. This can cause calls to fopen (but not calls to
4831 * open, for example) to fail mysteriously, perhaps in 3rd party
4832 * native code (although the JDK itself uses fopen). One can hardly
4833 * criticize them for using this most standard of all functions.
4834 *
4835 * We attempt to make everything work anyways by:
4836 *
4837 * - raising the soft limit on per-process file descriptors beyond
4838 * 256
4839 *
4840 * - As of Solaris 10u4, we can request that Solaris raise the 256
4841 * stdio fopen limit by calling function enable_extended_FILE_stdio.
4842 * This is done in init_2 and recorded in enabled_extended_FILE_stdio
4843 *
4844 * - If we are stuck on an old (pre 10u4) Solaris system, we can
4845 * workaround the bug by remapping non-stdio file descriptors below
4846 * 256 to ones beyond 256, which is done below.
4847 *
4848 * See:
4849 * 1085341: 32-bit stdio routines should support file descriptors >255
4850 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4851 * 6431278: Netbeans crash on 32 bit Solaris: need to call
4852 * enable_extended_FILE_stdio() in VM initialisation
4853 * Giri Mandalika's blog
4854 * http://technopark02.blogspot.com/2005_05_01_archive.html
4855 */
4856 #ifndef _LP64
4857 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4858 int newfd = ::fcntl(fd, F_DUPFD, 256);
4859 if (newfd != -1) {
4860 ::close(fd);
4861 fd = newfd;
4862 }
4863 }
4864 #endif // 32-bit Solaris
4865 /*
4866 * All file descriptors that are opened in the JVM and not
4867 * specifically destined for a subprocess should have the
4868 * close-on-exec flag set. If we don't set it, then careless 3rd
4869 * party native code might fork and exec without closing all
4870 * appropriate file descriptors (e.g. as we do in closeDescriptors in
4871 * UNIXProcess.c), and this in turn might:
4872 *
4873 * - cause end-of-file to fail to be detected on some file
4874 * descriptors, resulting in mysterious hangs, or
4875 *
4876 * - might cause an fopen in the subprocess to fail on a system
4877 * suffering from bug 1085341.
4878 *
4879 * (Yes, the default setting of the close-on-exec flag is a Unix
4880 * design flaw)
4881 *
4882 * See:
4883 * 1085341: 32-bit stdio routines should support file descriptors >255
4884 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4885 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4886 */
4887 #ifdef FD_CLOEXEC
4888 {
4889 int flags = ::fcntl(fd, F_GETFD);
4890 if (flags != -1)
4891 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4892 }
4893 #endif
4894
4895 if (o_delete != 0) {
4896 ::unlink(path);
4897 }
4898 return fd;
4899 }
4900
4901 // create binary file, rewriting existing file if required
4902 int os::create_binary_file(const char* path, bool rewrite_existing) {
4903 int oflags = O_WRONLY | O_CREAT;
4904 if (!rewrite_existing) {
4905 oflags |= O_EXCL;
4906 }
4907 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4908 }
4909
4910 // return current position of file pointer
4911 jlong os::current_file_offset(int fd) {
4912 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4913 }
4914
4915 // move file pointer to the specified offset
4916 jlong os::seek_to_file_offset(int fd, jlong offset) {
4917 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4918 }
4919
4920 jlong os::lseek(int fd, jlong offset, int whence) {
4921 return (jlong) ::lseek64(fd, offset, whence);
4922 }
4923
4924 char * os::native_path(char *path) {
4925 return path;
4926 }
4927
4928 int os::ftruncate(int fd, jlong length) {
4929 return ::ftruncate64(fd, length);
4930 }
4931
4932 int os::fsync(int fd) {
4933 RESTARTABLE_RETURN_INT(::fsync(fd));
4934 }
4935
4936 int os::available(int fd, jlong *bytes) {
4937 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4938 "Assumed _thread_in_native");
4939 jlong cur, end;
4940 int mode;
4941 struct stat64 buf64;
4942
4943 if (::fstat64(fd, &buf64) >= 0) {
4944 mode = buf64.st_mode;
4945 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4946 int n,ioctl_return;
4947
4948 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4949 if (ioctl_return>= 0) {
4950 *bytes = n;
4951 return 1;
4952 }
4953 }
4954 }
4955 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4956 return 0;
4957 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4958 return 0;
4959 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4960 return 0;
4961 }
4962 *bytes = end - cur;
4963 return 1;
4964 }
4965
4966 // Map a block of memory.
4967 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4968 char *addr, size_t bytes, bool read_only,
4969 bool allow_exec) {
4970 int prot;
4971 int flags;
4972
4973 if (read_only) {
4974 prot = PROT_READ;
4975 flags = MAP_SHARED;
4976 } else {
4977 prot = PROT_READ | PROT_WRITE;
4978 flags = MAP_PRIVATE;
4979 }
4980
4981 if (allow_exec) {
4982 prot |= PROT_EXEC;
4983 }
4984
4985 if (addr != NULL) {
4986 flags |= MAP_FIXED;
4987 }
4988
4989 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4990 fd, file_offset);
4991 if (mapped_address == MAP_FAILED) {
4992 return NULL;
4993 }
4994 return mapped_address;
4995 }
4996
4997
4998 // Remap a block of memory.
4999 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
5000 char *addr, size_t bytes, bool read_only,
5001 bool allow_exec) {
5002 // same as map_memory() on this OS
5003 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
5004 allow_exec);
5005 }
5006
5007
5008 // Unmap a block of memory.
5009 bool os::pd_unmap_memory(char* addr, size_t bytes) {
5010 return munmap(addr, bytes) == 0;
5011 }
5012
5013 void os::pause() {
5014 char filename[MAX_PATH];
5015 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
5016 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
5017 } else {
5018 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
5019 }
5020
5021 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
5022 if (fd != -1) {
5023 struct stat buf;
5024 ::close(fd);
5025 while (::stat(filename, &buf) == 0) {
5026 (void)::poll(NULL, 0, 100);
5027 }
5028 } else {
5029 jio_fprintf(stderr,
5030 "Could not open pause file '%s', continuing immediately.\n", filename);
5031 }
5032 }
5033
5034 #ifndef PRODUCT
5035 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5036 // Turn this on if you need to trace synch operations.
5037 // Set RECORD_SYNCH_LIMIT to a large-enough value,
5038 // and call record_synch_enable and record_synch_disable
5039 // around the computation of interest.
5040
5041 void record_synch(char* name, bool returning); // defined below
5042
5043 class RecordSynch {
5044 char* _name;
5045 public:
5046 RecordSynch(char* name) :_name(name)
5047 { record_synch(_name, false); }
5048 ~RecordSynch() { record_synch(_name, true); }
5049 };
5050
5051 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
5052 extern "C" ret name params { \
5053 typedef ret name##_t params; \
5054 static name##_t* implem = NULL; \
5055 static int callcount = 0; \
5056 if (implem == NULL) { \
5057 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
5058 if (implem == NULL) fatal(dlerror()); \
5059 } \
5060 ++callcount; \
5061 RecordSynch _rs(#name); \
5062 inner; \
5063 return implem args; \
5064 }
5065 // in dbx, examine callcounts this way:
5066 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
5067
5068 #define CHECK_POINTER_OK(p) \
5069 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
5070 #define CHECK_MU \
5071 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
5072 #define CHECK_CV \
5073 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
5074 #define CHECK_P(p) \
5075 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
5076
5077 #define CHECK_MUTEX(mutex_op) \
5078 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
5079
5080 CHECK_MUTEX( mutex_lock)
5081 CHECK_MUTEX( _mutex_lock)
5082 CHECK_MUTEX( mutex_unlock)
5083 CHECK_MUTEX(_mutex_unlock)
5084 CHECK_MUTEX( mutex_trylock)
5085 CHECK_MUTEX(_mutex_trylock)
5086
5087 #define CHECK_COND(cond_op) \
5088 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV);
5089
5090 CHECK_COND( cond_wait);
5091 CHECK_COND(_cond_wait);
5092 CHECK_COND(_cond_wait_cancel);
5093
5094 #define CHECK_COND2(cond_op) \
5095 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV);
5096
5097 CHECK_COND2( cond_timedwait);
5098 CHECK_COND2(_cond_timedwait);
5099 CHECK_COND2(_cond_timedwait_cancel);
5100
5101 // do the _lwp_* versions too
5102 #define mutex_t lwp_mutex_t
5103 #define cond_t lwp_cond_t
5104 CHECK_MUTEX( _lwp_mutex_lock)
5105 CHECK_MUTEX( _lwp_mutex_unlock)
5106 CHECK_MUTEX( _lwp_mutex_trylock)
5107 CHECK_MUTEX( __lwp_mutex_lock)
5108 CHECK_MUTEX( __lwp_mutex_unlock)
5109 CHECK_MUTEX( __lwp_mutex_trylock)
5110 CHECK_MUTEX(___lwp_mutex_lock)
5111 CHECK_MUTEX(___lwp_mutex_unlock)
5112
5113 CHECK_COND( _lwp_cond_wait);
5114 CHECK_COND( __lwp_cond_wait);
5115 CHECK_COND(___lwp_cond_wait);
5116
5117 CHECK_COND2( _lwp_cond_timedwait);
5118 CHECK_COND2( __lwp_cond_timedwait);
5119 #undef mutex_t
5120 #undef cond_t
5121
5122 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5123 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
5124 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
5125 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
5126 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5127 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
5128 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5129 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
5130
5131
5132 // recording machinery:
5133
5134 enum { RECORD_SYNCH_LIMIT = 200 };
5135 char* record_synch_name[RECORD_SYNCH_LIMIT];
5136 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5137 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5138 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5139 int record_synch_count = 0;
5140 bool record_synch_enabled = false;
5141
5142 // in dbx, examine recorded data this way:
5143 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5144
5145 void record_synch(char* name, bool returning) {
5146 if (record_synch_enabled) {
5147 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5148 record_synch_name[record_synch_count] = name;
5149 record_synch_returning[record_synch_count] = returning;
5150 record_synch_thread[record_synch_count] = thr_self();
5151 record_synch_arg0ptr[record_synch_count] = &name;
5152 record_synch_count++;
5153 }
5154 // put more checking code here:
5155 // ...
5156 }
5157 }
5158
5159 void record_synch_enable() {
5160 // start collecting trace data, if not already doing so
5161 if (!record_synch_enabled) record_synch_count = 0;
5162 record_synch_enabled = true;
5163 }
5164
5165 void record_synch_disable() {
5166 // stop collecting trace data
5167 record_synch_enabled = false;
5168 }
5169
5170 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5171 #endif // PRODUCT
5172
5173 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5174 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5175 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5176
5177
5178 // JVMTI & JVM monitoring and management support
5179 // The thread_cpu_time() and current_thread_cpu_time() are only
5180 // supported if is_thread_cpu_time_supported() returns true.
5181 // They are not supported on Solaris T1.
5182
5183 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5184 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5185 // of a thread.
5186 //
5187 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5188 // returns the fast estimate available on the platform.
5189
5190 // hrtime_t gethrvtime() return value includes
5191 // user time but does not include system time
5192 jlong os::current_thread_cpu_time() {
5193 return (jlong) gethrvtime();
5194 }
5195
5196 jlong os::thread_cpu_time(Thread *thread) {
5197 // return user level CPU time only to be consistent with
5198 // what current_thread_cpu_time returns.
5199 // thread_cpu_time_info() must be changed if this changes
5200 return os::thread_cpu_time(thread, false /* user time only */);
5201 }
5202
5203 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5204 if (user_sys_cpu_time) {
5205 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5206 } else {
5207 return os::current_thread_cpu_time();
5208 }
5209 }
5210
5211 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5212 char proc_name[64];
5213 int count;
5214 prusage_t prusage;
5215 jlong lwp_time;
5216 int fd;
5217
5218 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5219 getpid(),
5220 thread->osthread()->lwp_id());
5221 fd = ::open(proc_name, O_RDONLY);
5222 if (fd == -1) return -1;
5223
5224 do {
5225 count = ::pread(fd,
5226 (void *)&prusage.pr_utime,
5227 thr_time_size,
5228 thr_time_off);
5229 } while (count < 0 && errno == EINTR);
5230 ::close(fd);
5231 if (count < 0) return -1;
5232
5233 if (user_sys_cpu_time) {
5234 // user + system CPU time
5235 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5236 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5237 (jlong)prusage.pr_stime.tv_nsec +
5238 (jlong)prusage.pr_utime.tv_nsec;
5239 } else {
5240 // user level CPU time only
5241 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5242 (jlong)prusage.pr_utime.tv_nsec;
5243 }
5244
5245 return (lwp_time);
5246 }
5247
5248 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5249 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5250 info_ptr->may_skip_backward = false; // elapsed time not wall time
5251 info_ptr->may_skip_forward = false; // elapsed time not wall time
5252 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5253 }
5254
5255 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5256 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5257 info_ptr->may_skip_backward = false; // elapsed time not wall time
5258 info_ptr->may_skip_forward = false; // elapsed time not wall time
5259 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5260 }
5261
5262 bool os::is_thread_cpu_time_supported() {
5263 return true;
5264 }
5265
5266 // System loadavg support. Returns -1 if load average cannot be obtained.
5267 // Return the load average for our processor set if the primitive exists
5268 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5269 int os::loadavg(double loadavg[], int nelem) {
5270 if (pset_getloadavg_ptr != NULL) {
5271 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5272 } else {
5273 return ::getloadavg(loadavg, nelem);
5274 }
5275 }
5276
5277 //---------------------------------------------------------------------------------
5278
5279 bool os::find(address addr, outputStream* st) {
5280 Dl_info dlinfo;
5281 memset(&dlinfo, 0, sizeof(dlinfo));
5282 if (dladdr(addr, &dlinfo) != 0) {
5283 st->print(PTR_FORMAT ": ", addr);
5284 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5285 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5286 } else if (dlinfo.dli_fbase != NULL)
5287 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5288 else
5289 st->print("<absolute address>");
5290 if (dlinfo.dli_fname != NULL) {
5291 st->print(" in %s", dlinfo.dli_fname);
5292 }
5293 if (dlinfo.dli_fbase != NULL) {
5294 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5295 }
5296 st->cr();
5297
5298 if (Verbose) {
5299 // decode some bytes around the PC
5300 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5301 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5302 address lowest = (address) dlinfo.dli_sname;
5303 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5304 if (begin < lowest) begin = lowest;
5305 Dl_info dlinfo2;
5306 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5307 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin)
5308 end = (address) dlinfo2.dli_saddr;
5309 Disassembler::decode(begin, end, st);
5310 }
5311 return true;
5312 }
5313 return false;
5314 }
5315
5316 // Following function has been added to support HotSparc's libjvm.so running
5317 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5318 // src/solaris/hpi/native_threads in the EVM codebase.
5319 //
5320 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5321 // libraries and should thus be removed. We will leave it behind for a while
5322 // until we no longer want to able to run on top of 1.3.0 Solaris production
5323 // JDK. See 4341971.
5324
5325 #define STACK_SLACK 0x800
5326
5327 extern "C" {
5328 intptr_t sysThreadAvailableStackWithSlack() {
5329 stack_t st;
5330 intptr_t retval, stack_top;
5331 retval = thr_stksegment(&st);
5332 assert(retval == 0, "incorrect return value from thr_stksegment");
5333 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5334 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5335 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5336 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5337 }
5338 }
5339
5340 // ObjectMonitor park-unpark infrastructure ...
5341 //
5342 // We implement Solaris and Linux PlatformEvents with the
5343 // obvious condvar-mutex-flag triple.
5344 // Another alternative that works quite well is pipes:
5345 // Each PlatformEvent consists of a pipe-pair.
5346 // The thread associated with the PlatformEvent
5347 // calls park(), which reads from the input end of the pipe.
5348 // Unpark() writes into the other end of the pipe.
5349 // The write-side of the pipe must be set NDELAY.
5350 // Unfortunately pipes consume a large # of handles.
5351 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5352 // Using pipes for the 1st few threads might be workable, however.
5353 //
5354 // park() is permitted to return spuriously.
5355 // Callers of park() should wrap the call to park() in
5356 // an appropriate loop. A litmus test for the correct
5357 // usage of park is the following: if park() were modified
5358 // to immediately return 0 your code should still work,
5359 // albeit degenerating to a spin loop.
5360 //
5361 // An interesting optimization for park() is to use a trylock()
5362 // to attempt to acquire the mutex. If the trylock() fails
5363 // then we know that a concurrent unpark() operation is in-progress.
5364 // in that case the park() code could simply set _count to 0
5365 // and return immediately. The subsequent park() operation *might*
5366 // return immediately. That's harmless as the caller of park() is
5367 // expected to loop. By using trylock() we will have avoided a
5368 // avoided a context switch caused by contention on the per-thread mutex.
5369 //
5370 // TODO-FIXME:
5371 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the
5372 // objectmonitor implementation.
5373 // 2. Collapse the JSR166 parker event, and the
5374 // objectmonitor ParkEvent into a single "Event" construct.
5375 // 3. In park() and unpark() add:
5376 // assert (Thread::current() == AssociatedWith).
5377 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch.
5378 // 1-out-of-N park() operations will return immediately.
5379 //
5380 // _Event transitions in park()
5381 // -1 => -1 : illegal
5382 // 1 => 0 : pass - return immediately
5383 // 0 => -1 : block
5384 //
5385 // _Event serves as a restricted-range semaphore.
5386 //
5387 // Another possible encoding of _Event would be with
5388 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5389 //
5390 // TODO-FIXME: add DTRACE probes for:
5391 // 1. Tx parks
5392 // 2. Ty unparks Tx
5393 // 3. Tx resumes from park
5394
5395
5396 // value determined through experimentation
5397 #define ROUNDINGFIX 11
5398
5399 // utility to compute the abstime argument to timedwait.
5400 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5401
5402 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5403 // millis is the relative timeout time
5404 // abstime will be the absolute timeout time
5405 if (millis < 0) millis = 0;
5406 struct timeval now;
5407 int status = gettimeofday(&now, NULL);
5408 assert(status == 0, "gettimeofday");
5409 jlong seconds = millis / 1000;
5410 jlong max_wait_period;
5411
5412 if (UseLWPSynchronization) {
5413 // forward port of fix for 4275818 (not sleeping long enough)
5414 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5415 // _lwp_cond_timedwait() used a round_down algorithm rather
5416 // than a round_up. For millis less than our roundfactor
5417 // it rounded down to 0 which doesn't meet the spec.
5418 // For millis > roundfactor we may return a bit sooner, but
5419 // since we can not accurately identify the patch level and
5420 // this has already been fixed in Solaris 9 and 8 we will
5421 // leave it alone rather than always rounding down.
5422
5423 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5424 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5425 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5426 max_wait_period = 21000000;
5427 } else {
5428 max_wait_period = 50000000;
5429 }
5430 millis %= 1000;
5431 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5432 seconds = max_wait_period;
5433 }
5434 abstime->tv_sec = now.tv_sec + seconds;
5435 long usec = now.tv_usec + millis * 1000;
5436 if (usec >= 1000000) {
5437 abstime->tv_sec += 1;
5438 usec -= 1000000;
5439 }
5440 abstime->tv_nsec = usec * 1000;
5441 return abstime;
5442 }
5443
5444 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
5445 // Conceptually TryPark() should be equivalent to park(0).
5446
5447 int os::PlatformEvent::TryPark() {
5448 for (;;) {
5449 const int v = _Event;
5450 guarantee((v == 0) || (v == 1), "invariant");
5451 if (Atomic::cmpxchg(0, &_Event, v) == v) return v;
5452 }
5453 }
5454
5455 void os::PlatformEvent::park() { // AKA: down()
5456 // Invariant: Only the thread associated with the Event/PlatformEvent
5457 // may call park().
5458 int v;
5459 for (;;) {
5460 v = _Event;
5461 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5462 }
5463 guarantee(v >= 0, "invariant");
5464 if (v == 0) {
5465 // Do this the hard way by blocking ...
5466 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5467 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5468 // Only for SPARC >= V8PlusA
5469 #if defined(__sparc) && defined(COMPILER2)
5470 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5471 #endif
5472 int status = os::Solaris::mutex_lock(_mutex);
5473 assert_status(status == 0, status, "mutex_lock");
5474 guarantee(_nParked == 0, "invariant");
5475 ++_nParked;
5476 while (_Event < 0) {
5477 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5478 // Treat this the same as if the wait was interrupted
5479 // With usr/lib/lwp going to kernel, always handle ETIME
5480 status = os::Solaris::cond_wait(_cond, _mutex);
5481 if (status == ETIME) status = EINTR;
5482 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5483 }
5484 --_nParked;
5485 _Event = 0;
5486 status = os::Solaris::mutex_unlock(_mutex);
5487 assert_status(status == 0, status, "mutex_unlock");
5488 // Paranoia to ensure our locked and lock-free paths interact
5489 // correctly with each other.
5490 OrderAccess::fence();
5491 }
5492 }
5493
5494 int os::PlatformEvent::park(jlong millis) {
5495 guarantee(_nParked == 0, "invariant");
5496 int v;
5497 for (;;) {
5498 v = _Event;
5499 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5500 }
5501 guarantee(v >= 0, "invariant");
5502 if (v != 0) return OS_OK;
5503
5504 int ret = OS_TIMEOUT;
5505 timestruc_t abst;
5506 compute_abstime(&abst, millis);
5507
5508 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5509 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5510 // Only for SPARC >= V8PlusA
5511 #if defined(__sparc) && defined(COMPILER2)
5512 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5513 #endif
5514 int status = os::Solaris::mutex_lock(_mutex);
5515 assert_status(status == 0, status, "mutex_lock");
5516 guarantee(_nParked == 0, "invariant");
5517 ++_nParked;
5518 while (_Event < 0) {
5519 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5520 assert_status(status == 0 || status == EINTR ||
5521 status == ETIME || status == ETIMEDOUT,
5522 status, "cond_timedwait");
5523 if (!FilterSpuriousWakeups) break; // previous semantics
5524 if (status == ETIME || status == ETIMEDOUT) break;
5525 // We consume and ignore EINTR and spurious wakeups.
5526 }
5527 --_nParked;
5528 if (_Event >= 0) ret = OS_OK;
5529 _Event = 0;
5530 status = os::Solaris::mutex_unlock(_mutex);
5531 assert_status(status == 0, status, "mutex_unlock");
5532 // Paranoia to ensure our locked and lock-free paths interact
5533 // correctly with each other.
5534 OrderAccess::fence();
5535 return ret;
5536 }
5537
5538 void os::PlatformEvent::unpark() {
5539 // Transitions for _Event:
5540 // 0 :=> 1
5541 // 1 :=> 1
5542 // -1 :=> either 0 or 1; must signal target thread
5543 // That is, we can safely transition _Event from -1 to either
5544 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back
5545 // unpark() calls.
5546 // See also: "Semaphores in Plan 9" by Mullender & Cox
5547 //
5548 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5549 // that it will take two back-to-back park() calls for the owning
5550 // thread to block. This has the benefit of forcing a spurious return
5551 // from the first park() call after an unpark() call which will help
5552 // shake out uses of park() and unpark() without condition variables.
5553
5554 if (Atomic::xchg(1, &_Event) >= 0) return;
5555
5556 // If the thread associated with the event was parked, wake it.
5557 // Wait for the thread assoc with the PlatformEvent to vacate.
5558 int status = os::Solaris::mutex_lock(_mutex);
5559 assert_status(status == 0, status, "mutex_lock");
5560 int AnyWaiters = _nParked;
5561 status = os::Solaris::mutex_unlock(_mutex);
5562 assert_status(status == 0, status, "mutex_unlock");
5563 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5564 if (AnyWaiters != 0) {
5565 // We intentional signal *after* dropping the lock
5566 // to avoid a common class of futile wakeups.
5567 status = os::Solaris::cond_signal(_cond);
5568 assert_status(status == 0, status, "cond_signal");
5569 }
5570 }
5571
5572 // JSR166
5573 // -------------------------------------------------------
5574
5575 /*
5576 * The solaris and linux implementations of park/unpark are fairly
5577 * conservative for now, but can be improved. They currently use a
5578 * mutex/condvar pair, plus _counter.
5579 * Park decrements _counter if > 0, else does a condvar wait. Unpark
5580 * sets count to 1 and signals condvar. Only one thread ever waits
5581 * on the condvar. Contention seen when trying to park implies that someone
5582 * is unparking you, so don't wait. And spurious returns are fine, so there
5583 * is no need to track notifications.
5584 */
5585
5586 #define MAX_SECS 100000000
5587 /*
5588 * This code is common to linux and solaris and will be moved to a
5589 * common place in dolphin.
5590 *
5591 * The passed in time value is either a relative time in nanoseconds
5592 * or an absolute time in milliseconds. Either way it has to be unpacked
5593 * into suitable seconds and nanoseconds components and stored in the
5594 * given timespec structure.
5595 * Given time is a 64-bit value and the time_t used in the timespec is only
5596 * a signed-32-bit value (except on 64-bit Linux) we have to watch for
5597 * overflow if times way in the future are given. Further on Solaris versions
5598 * prior to 10 there is a restriction (see cond_timedwait) that the specified
5599 * number of seconds, in abstime, is less than current_time + 100,000,000.
5600 * As it will be 28 years before "now + 100000000" will overflow we can
5601 * ignore overflow and just impose a hard-limit on seconds using the value
5602 * of "now + 100,000,000". This places a limit on the timeout of about 3.17
5603 * years from "now".
5604 */
5605 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5606 assert(time > 0, "convertTime");
5607
5608 struct timeval now;
5609 int status = gettimeofday(&now, NULL);
5610 assert(status == 0, "gettimeofday");
5611
5612 time_t max_secs = now.tv_sec + MAX_SECS;
5613
5614 if (isAbsolute) {
5615 jlong secs = time / 1000;
5616 if (secs > max_secs) {
5617 absTime->tv_sec = max_secs;
5618 }
5619 else {
5620 absTime->tv_sec = secs;
5621 }
5622 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5623 }
5624 else {
5625 jlong secs = time / NANOSECS_PER_SEC;
5626 if (secs >= MAX_SECS) {
5627 absTime->tv_sec = max_secs;
5628 absTime->tv_nsec = 0;
5629 }
5630 else {
5631 absTime->tv_sec = now.tv_sec + secs;
5632 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5633 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5634 absTime->tv_nsec -= NANOSECS_PER_SEC;
5635 ++absTime->tv_sec; // note: this must be <= max_secs
5636 }
5637 }
5638 }
5639 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5640 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5641 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5642 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5643 }
5644
5645 void Parker::park(bool isAbsolute, jlong time) {
5646 // Ideally we'd do something useful while spinning, such
5647 // as calling unpackTime().
5648
5649 // Optional fast-path check:
5650 // Return immediately if a permit is available.
5651 // We depend on Atomic::xchg() having full barrier semantics
5652 // since we are doing a lock-free update to _counter.
5653 if (Atomic::xchg(0, &_counter) > 0) return;
5654
5655 // Optional fast-exit: Check interrupt before trying to wait
5656 Thread* thread = Thread::current();
5657 assert(thread->is_Java_thread(), "Must be JavaThread");
5658 JavaThread *jt = (JavaThread *)thread;
5659 if (Thread::is_interrupted(thread, false)) {
5660 return;
5661 }
5662
5663 // First, demultiplex/decode time arguments
5664 timespec absTime;
5665 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5666 return;
5667 }
5668 if (time > 0) {
5669 // Warning: this code might be exposed to the old Solaris time
5670 // round-down bugs. Grep "roundingFix" for details.
5671 unpackTime(&absTime, isAbsolute, time);
5672 }
5673
5674 // Enter safepoint region
5675 // Beware of deadlocks such as 6317397.
5676 // The per-thread Parker:: _mutex is a classic leaf-lock.
5677 // In particular a thread must never block on the Threads_lock while
5678 // holding the Parker:: mutex. If safepoints are pending both the
5679 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5680 ThreadBlockInVM tbivm(jt);
5681
5682 // Don't wait if cannot get lock since interference arises from
5683 // unblocking. Also. check interrupt before trying wait
5684 if (Thread::is_interrupted(thread, false) ||
5685 os::Solaris::mutex_trylock(_mutex) != 0) {
5686 return;
5687 }
5688
5689 int status;
5690
5691 if (_counter > 0) { // no wait needed
5692 _counter = 0;
5693 status = os::Solaris::mutex_unlock(_mutex);
5694 assert(status == 0, "invariant");
5695 // Paranoia to ensure our locked and lock-free paths interact
5696 // correctly with each other and Java-level accesses.
5697 OrderAccess::fence();
5698 return;
5699 }
5700
5701 #ifdef ASSERT
5702 // Don't catch signals while blocked; let the running threads have the signals.
5703 // (This allows a debugger to break into the running thread.)
5704 sigset_t oldsigs;
5705 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5706 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5707 #endif
5708
5709 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5710 jt->set_suspend_equivalent();
5711 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5712
5713 // Do this the hard way by blocking ...
5714 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5715 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5716 // Only for SPARC >= V8PlusA
5717 #if defined(__sparc) && defined(COMPILER2)
5718 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5719 #endif
5720
5721 if (time == 0) {
5722 status = os::Solaris::cond_wait(_cond, _mutex);
5723 } else {
5724 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5725 }
5726 // Note that an untimed cond_wait() can sometimes return ETIME on older
5727 // versions of the Solaris.
5728 assert_status(status == 0 || status == EINTR ||
5729 status == ETIME || status == ETIMEDOUT,
5730 status, "cond_timedwait");
5731
5732 #ifdef ASSERT
5733 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
5734 #endif
5735 _counter = 0;
5736 status = os::Solaris::mutex_unlock(_mutex);
5737 assert_status(status == 0, status, "mutex_unlock");
5738 // Paranoia to ensure our locked and lock-free paths interact
5739 // correctly with each other and Java-level accesses.
5740 OrderAccess::fence();
5741
5742 // If externally suspended while waiting, re-suspend
5743 if (jt->handle_special_suspend_equivalent_condition()) {
5744 jt->java_suspend_self();
5745 }
5746 }
5747
5748 void Parker::unpark() {
5749 int s, status;
5750 status = os::Solaris::mutex_lock(_mutex);
5751 assert(status == 0, "invariant");
5752 s = _counter;
5753 _counter = 1;
5754 status = os::Solaris::mutex_unlock(_mutex);
5755 assert(status == 0, "invariant");
5756
5757 if (s < 1) {
5758 status = os::Solaris::cond_signal(_cond);
5759 assert(status == 0, "invariant");
5760 }
5761 }
5762
5763 extern char** environ;
5764
5765 // Run the specified command in a separate process. Return its exit value,
5766 // or -1 on failure (e.g. can't fork a new process).
5767 // Unlike system(), this function can be called from signal handler. It
5768 // doesn't block SIGINT et al.
5769 int os::fork_and_exec(char* cmd) {
5770 char * argv[4];
5771 argv[0] = (char *)"sh";
5772 argv[1] = (char *)"-c";
5773 argv[2] = cmd;
5774 argv[3] = NULL;
5775
5776 // fork is async-safe, fork1 is not so can't use in signal handler
5777 pid_t pid;
5778 Thread* t = ThreadLocalStorage::get_thread_slow();
5779 if (t != NULL && t->is_inside_signal_handler()) {
5780 pid = fork();
5781 } else {
5782 pid = fork1();
5783 }
5784
5785 if (pid < 0) {
5786 // fork failed
5787 warning("fork failed: %s", strerror(errno));
5788 return -1;
5789
5790 } else if (pid == 0) {
5791 // child process
5792
5793 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5794 execve("/usr/bin/sh", argv, environ);
5795
5796 // execve failed
5797 _exit(-1);
5798
5799 } else {
5800 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5801 // care about the actual exit code, for now.
5802
5803 int status;
5804
5805 // Wait for the child process to exit. This returns immediately if
5806 // the child has already exited. */
5807 while (waitpid(pid, &status, 0) < 0) {
5808 switch (errno) {
5809 case ECHILD: return 0;
5810 case EINTR: break;
5811 default: return -1;
5812 }
5813 }
5814
5815 if (WIFEXITED(status)) {
5816 // The child exited normally; get its exit code.
5817 return WEXITSTATUS(status);
5818 } else if (WIFSIGNALED(status)) {
5819 // The child exited because of a signal
5820 // The best value to return is 0x80 + signal number,
5821 // because that is what all Unix shells do, and because
5822 // it allows callers to distinguish between process exit and
5823 // process death by signal.
5824 return 0x80 + WTERMSIG(status);
5825 } else {
5826 // Unknown exit code; pass it through
5827 return status;
5828 }
5829 }
5830 }
5831
5832 // is_headless_jre()
5833 //
5834 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5835 // in order to report if we are running in a headless jre
5836 //
5837 // Since JDK8 xawt/libmawt.so was moved into the same directory
5838 // as libawt.so, and renamed libawt_xawt.so
5839 //
5840 bool os::is_headless_jre() {
5841 struct stat statbuf;
5842 char buf[MAXPATHLEN];
5843 char libmawtpath[MAXPATHLEN];
5844 const char *xawtstr = "/xawt/libmawt.so";
5845 const char *new_xawtstr = "/libawt_xawt.so";
5846 char *p;
5847
5848 // Get path to libjvm.so
5849 os::jvm_path(buf, sizeof(buf));
5850
5851 // Get rid of libjvm.so
5852 p = strrchr(buf, '/');
5853 if (p == NULL) return false;
5854 else *p = '\0';
5855
5856 // Get rid of client or server
5857 p = strrchr(buf, '/');
5858 if (p == NULL) return false;
5859 else *p = '\0';
5860
5861 // check xawt/libmawt.so
5862 strcpy(libmawtpath, buf);
5863 strcat(libmawtpath, xawtstr);
5864 if (::stat(libmawtpath, &statbuf) == 0) return false;
5865
5866 // check libawt_xawt.so
5867 strcpy(libmawtpath, buf);
5868 strcat(libmawtpath, new_xawtstr);
5869 if (::stat(libmawtpath, &statbuf) == 0) return false;
5870
5871 return true;
5872 }
5873
5874 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5875 size_t res;
5876 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5877 "Assumed _thread_in_native");
5878 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5879 return res;
5880 }
5881
5882 int os::close(int fd) {
5883 return ::close(fd);
5884 }
5885
5886 int os::socket_close(int fd) {
5887 return ::close(fd);
5888 }
5889
5890 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5891 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5892 "Assumed _thread_in_native");
5893 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5894 }
5895
5896 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5897 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5898 "Assumed _thread_in_native");
5899 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5900 }
5901
5902 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5903 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5904 }
5905
5906 // As both poll and select can be interrupted by signals, we have to be
5907 // prepared to restart the system call after updating the timeout, unless
5908 // a poll() is done with timeout == -1, in which case we repeat with this
5909 // "wait forever" value.
5910
5911 int os::timeout(int fd, long timeout) {
5912 int res;
5913 struct timeval t;
5914 julong prevtime, newtime;
5915 static const char* aNull = 0;
5916 struct pollfd pfd;
5917 pfd.fd = fd;
5918 pfd.events = POLLIN;
5919
5920 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5921 "Assumed _thread_in_native");
5922
5923 gettimeofday(&t, &aNull);
5924 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000;
5925
5926 for (;;) {
5927 res = ::poll(&pfd, 1, timeout);
5928 if (res == OS_ERR && errno == EINTR) {
5929 if (timeout != -1) {
5930 gettimeofday(&t, &aNull);
5931 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000;
5932 timeout -= newtime - prevtime;
5933 if (timeout <= 0)
5934 return OS_OK;
5935 prevtime = newtime;
5936 }
5937 } else return res;
5938 }
5939 }
5940
5941 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5942 int _result;
5943 _result = ::connect(fd, him, len);
5944
5945 // On Solaris, when a connect() call is interrupted, the connection
5946 // can be established asynchronously (see 6343810). Subsequent calls
5947 // to connect() must check the errno value which has the semantic
5948 // described below (copied from the connect() man page). Handling
5949 // of asynchronously established connections is required for both
5950 // blocking and non-blocking sockets.
5951 // EINTR The connection attempt was interrupted
5952 // before any data arrived by the delivery of
5953 // a signal. The connection, however, will be
5954 // established asynchronously.
5955 //
5956 // EINPROGRESS The socket is non-blocking, and the connec-
5957 // tion cannot be completed immediately.
5958 //
5959 // EALREADY The socket is non-blocking, and a previous
5960 // connection attempt has not yet been com-
5961 // pleted.
5962 //
5963 // EISCONN The socket is already connected.
5964 if (_result == OS_ERR && errno == EINTR) {
5965 /* restarting a connect() changes its errno semantics */
5966 RESTARTABLE(::connect(fd, him, len), _result);
5967 /* undo these changes */
5968 if (_result == OS_ERR) {
5969 if (errno == EALREADY) {
5970 errno = EINPROGRESS; /* fall through */
5971 } else if (errno == EISCONN) {
5972 errno = 0;
5973 return OS_OK;
5974 }
5975 }
5976 }
5977 return _result;
5978 }
5979
5980 int os::accept(int fd, struct sockaddr* him, socklen_t* len) {
5981 if (fd < 0) {
5982 return OS_ERR;
5983 }
5984 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5985 "Assumed _thread_in_native");
5986 RESTARTABLE_RETURN_INT((int)::accept(fd, him, len));
5987 }
5988
5989 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags,
5990 sockaddr* from, socklen_t* fromlen) {
5991 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5992 "Assumed _thread_in_native");
5993 RESTARTABLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen));
5994 }
5995
5996 int os::sendto(int fd, char* buf, size_t len, uint flags,
5997 struct sockaddr* to, socklen_t tolen) {
5998 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5999 "Assumed _thread_in_native");
6000 RESTARTABLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen));
6001 }
6002
6003 int os::socket_available(int fd, jint *pbytes) {
6004 if (fd < 0) {
6005 return OS_OK;
6006 }
6007 int ret;
6008 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret);
6009 // note: ioctl can return 0 when successful, JVM_SocketAvailable
6010 // is expected to return 0 on failure and 1 on success to the jdk.
6011 return (ret == OS_ERR) ? 0 : 1;
6012 }
6013
6014 int os::bind(int fd, struct sockaddr* him, socklen_t len) {
6015 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
6016 "Assumed _thread_in_native");
6017 return ::bind(fd, him, len);
6018 }
6019
6020 // Get the default path to the core file
6021 // Returns the length of the string
6022 int os::get_core_path(char* buffer, size_t bufferSize) {
6023 const char* p = get_current_directory(buffer, bufferSize);
6024
6025 if (p == NULL) {
6026 assert(p != NULL, "failed to get current directory");
6027 return 0;
6028 }
6029
6030 return strlen(buffer);
6031 }
6032
6033 #ifndef PRODUCT
6034 void TestReserveMemorySpecial_test() {
6035 // No tests available for this platform
6036 }
6037 #endif