1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "classfile/classLoader.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/icBuffer.hpp"
30 #include "code/vtableStubs.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm_solaris.h"
35 #include "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "mutex_solaris.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_share_solaris.hpp"
41 #include "os_solaris.inline.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.inline.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "semaphore_posix.hpp"
65 #include "services/attachListener.hpp"
66 #include "services/memTracker.hpp"
67 #include "services/runtimeService.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/macros.hpp"
73 #include "utilities/vmError.hpp"
74
75 // put OS-includes here
76 # include <dlfcn.h>
77 # include <errno.h>
78 # include <exception>
79 # include <link.h>
80 # include <poll.h>
81 # include <pthread.h>
82 # include <pwd.h>
83 # include <schedctl.h>
84 # include <setjmp.h>
85 # include <signal.h>
86 # include <stdio.h>
87 # include <alloca.h>
88 # include <sys/filio.h>
89 # include <sys/ipc.h>
90 # include <sys/lwp.h>
91 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
92 # include <sys/mman.h>
93 # include <sys/processor.h>
94 # include <sys/procset.h>
95 # include <sys/pset.h>
96 # include <sys/resource.h>
97 # include <sys/shm.h>
98 # include <sys/socket.h>
99 # include <sys/stat.h>
100 # include <sys/systeminfo.h>
101 # include <sys/time.h>
102 # include <sys/times.h>
103 # include <sys/types.h>
104 # include <sys/wait.h>
105 # include <sys/utsname.h>
106 # include <thread.h>
107 # include <unistd.h>
108 # include <sys/priocntl.h>
109 # include <sys/rtpriocntl.h>
110 # include <sys/tspriocntl.h>
111 # include <sys/iapriocntl.h>
112 # include <sys/fxpriocntl.h>
113 # include <sys/loadavg.h>
114 # include <string.h>
115 # include <stdio.h>
116
117 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
118 # include <sys/procfs.h> // see comment in <sys/procfs.h>
119
120 #define MAX_PATH (2 * K)
121
122 // for timer info max values which include all bits
123 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
124
125
126 // Here are some liblgrp types from sys/lgrp_user.h to be able to
127 // compile on older systems without this header file.
128
129 #ifndef MADV_ACCESS_LWP
130 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
131 #endif
132 #ifndef MADV_ACCESS_MANY
133 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
134 #endif
135
136 #ifndef LGRP_RSRC_CPU
137 #define LGRP_RSRC_CPU 0 /* CPU resources */
138 #endif
139 #ifndef LGRP_RSRC_MEM
140 #define LGRP_RSRC_MEM 1 /* memory resources */
141 #endif
142
143 // Values for ThreadPriorityPolicy == 1
144 int prio_policy1[CriticalPriority+1] = {
145 -99999, 0, 16, 32, 48, 64,
146 80, 96, 112, 124, 127, 127 };
147
148 // System parameters used internally
149 static clock_t clock_tics_per_sec = 100;
150
151 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
152 static bool enabled_extended_FILE_stdio = false;
153
154 // For diagnostics to print a message once. see run_periodic_checks
155 static bool check_addr0_done = false;
156 static sigset_t check_signal_done;
157 static bool check_signals = true;
158
159 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
160 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
161
162 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
163
164 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
165
166 // "default" initializers for missing libc APIs
167 extern "C" {
168 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
169 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
170
171 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
172 static int lwp_cond_destroy(cond_t *cv) { return 0; }
173 }
174
175 // "default" initializers for pthread-based synchronization
176 extern "C" {
177 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
178 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
179 }
180
181 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
182
183 static inline size_t adjust_stack_size(address base, size_t size) {
184 if ((ssize_t)size < 0) {
185 // 4759953: Compensate for ridiculous stack size.
186 size = max_intx;
187 }
188 if (size > (size_t)base) {
189 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
190 size = (size_t)base;
191 }
192 return size;
193 }
194
195 static inline stack_t get_stack_info() {
196 stack_t st;
197 int retval = thr_stksegment(&st);
198 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
199 assert(retval == 0, "incorrect return value from thr_stksegment");
200 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
201 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
202 return st;
203 }
204
205 address os::current_stack_base() {
206 int r = thr_main();
207 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
208 bool is_primordial_thread = r;
209
210 // Workaround 4352906, avoid calls to thr_stksegment by
211 // thr_main after the first one (it looks like we trash
212 // some data, causing the value for ss_sp to be incorrect).
213 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
214 stack_t st = get_stack_info();
215 if (is_primordial_thread) {
216 // cache initial value of stack base
217 os::Solaris::_main_stack_base = (address)st.ss_sp;
218 }
219 return (address)st.ss_sp;
220 } else {
221 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
222 return os::Solaris::_main_stack_base;
223 }
224 }
225
226 size_t os::current_stack_size() {
227 size_t size;
228
229 int r = thr_main();
230 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
231 if (!r) {
232 size = get_stack_info().ss_size;
233 } else {
234 struct rlimit limits;
235 getrlimit(RLIMIT_STACK, &limits);
236 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
237 }
238 // base may not be page aligned
239 address base = current_stack_base();
240 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
241 return (size_t)(base - bottom);
242 }
243
244 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
245 return localtime_r(clock, res);
246 }
247
248 void os::Solaris::try_enable_extended_io() {
249 typedef int (*enable_extended_FILE_stdio_t)(int, int);
250
251 if (!UseExtendedFileIO) {
252 return;
253 }
254
255 enable_extended_FILE_stdio_t enabler =
256 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
257 "enable_extended_FILE_stdio");
258 if (enabler) {
259 enabler(-1, -1);
260 }
261 }
262
263 static int _processors_online = 0;
264
265 jint os::Solaris::_os_thread_limit = 0;
266 volatile jint os::Solaris::_os_thread_count = 0;
267
268 julong os::available_memory() {
269 return Solaris::available_memory();
270 }
271
272 julong os::Solaris::available_memory() {
273 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
274 }
275
276 julong os::Solaris::_physical_memory = 0;
277
278 julong os::physical_memory() {
279 return Solaris::physical_memory();
280 }
281
282 static hrtime_t first_hrtime = 0;
283 static const hrtime_t hrtime_hz = 1000*1000*1000;
284 static volatile hrtime_t max_hrtime = 0;
285
286
287 void os::Solaris::initialize_system_info() {
288 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
289 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
290 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
291 (julong)sysconf(_SC_PAGESIZE);
292 }
293
294 int os::active_processor_count() {
295 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
296 pid_t pid = getpid();
297 psetid_t pset = PS_NONE;
298 // Are we running in a processor set or is there any processor set around?
299 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
300 uint_t pset_cpus;
301 // Query the number of cpus available to us.
302 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
303 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
304 _processors_online = pset_cpus;
305 return pset_cpus;
306 }
307 }
308 // Otherwise return number of online cpus
309 return online_cpus;
310 }
311
312 static bool find_processors_in_pset(psetid_t pset,
313 processorid_t** id_array,
314 uint_t* id_length) {
315 bool result = false;
316 // Find the number of processors in the processor set.
317 if (pset_info(pset, NULL, id_length, NULL) == 0) {
318 // Make up an array to hold their ids.
319 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
320 // Fill in the array with their processor ids.
321 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
322 result = true;
323 }
324 }
325 return result;
326 }
327
328 // Callers of find_processors_online() must tolerate imprecise results --
329 // the system configuration can change asynchronously because of DR
330 // or explicit psradm operations.
331 //
332 // We also need to take care that the loop (below) terminates as the
333 // number of processors online can change between the _SC_NPROCESSORS_ONLN
334 // request and the loop that builds the list of processor ids. Unfortunately
335 // there's no reliable way to determine the maximum valid processor id,
336 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
337 // man pages, which claim the processor id set is "sparse, but
338 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
339 // exit the loop.
340 //
341 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
342 // not available on S8.0.
343
344 static bool find_processors_online(processorid_t** id_array,
345 uint* id_length) {
346 const processorid_t MAX_PROCESSOR_ID = 100000;
347 // Find the number of processors online.
348 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
349 // Make up an array to hold their ids.
350 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
351 // Processors need not be numbered consecutively.
352 long found = 0;
353 processorid_t next = 0;
354 while (found < *id_length && next < MAX_PROCESSOR_ID) {
355 processor_info_t info;
356 if (processor_info(next, &info) == 0) {
357 // NB, PI_NOINTR processors are effectively online ...
358 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
359 (*id_array)[found] = next;
360 found += 1;
361 }
362 }
363 next += 1;
364 }
365 if (found < *id_length) {
366 // The loop above didn't identify the expected number of processors.
367 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
368 // and re-running the loop, above, but there's no guarantee of progress
369 // if the system configuration is in flux. Instead, we just return what
370 // we've got. Note that in the worst case find_processors_online() could
371 // return an empty set. (As a fall-back in the case of the empty set we
372 // could just return the ID of the current processor).
373 *id_length = found;
374 }
375
376 return true;
377 }
378
379 static bool assign_distribution(processorid_t* id_array,
380 uint id_length,
381 uint* distribution,
382 uint distribution_length) {
383 // We assume we can assign processorid_t's to uint's.
384 assert(sizeof(processorid_t) == sizeof(uint),
385 "can't convert processorid_t to uint");
386 // Quick check to see if we won't succeed.
387 if (id_length < distribution_length) {
388 return false;
389 }
390 // Assign processor ids to the distribution.
391 // Try to shuffle processors to distribute work across boards,
392 // assuming 4 processors per board.
393 const uint processors_per_board = ProcessDistributionStride;
394 // Find the maximum processor id.
395 processorid_t max_id = 0;
396 for (uint m = 0; m < id_length; m += 1) {
397 max_id = MAX2(max_id, id_array[m]);
398 }
399 // The next id, to limit loops.
400 const processorid_t limit_id = max_id + 1;
401 // Make up markers for available processors.
402 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
403 for (uint c = 0; c < limit_id; c += 1) {
404 available_id[c] = false;
405 }
406 for (uint a = 0; a < id_length; a += 1) {
407 available_id[id_array[a]] = true;
408 }
409 // Step by "boards", then by "slot", copying to "assigned".
410 // NEEDS_CLEANUP: The assignment of processors should be stateful,
411 // remembering which processors have been assigned by
412 // previous calls, etc., so as to distribute several
413 // independent calls of this method. What we'd like is
414 // It would be nice to have an API that let us ask
415 // how many processes are bound to a processor,
416 // but we don't have that, either.
417 // In the short term, "board" is static so that
418 // subsequent distributions don't all start at board 0.
419 static uint board = 0;
420 uint assigned = 0;
421 // Until we've found enough processors ....
422 while (assigned < distribution_length) {
423 // ... find the next available processor in the board.
424 for (uint slot = 0; slot < processors_per_board; slot += 1) {
425 uint try_id = board * processors_per_board + slot;
426 if ((try_id < limit_id) && (available_id[try_id] == true)) {
427 distribution[assigned] = try_id;
428 available_id[try_id] = false;
429 assigned += 1;
430 break;
431 }
432 }
433 board += 1;
434 if (board * processors_per_board + 0 >= limit_id) {
435 board = 0;
436 }
437 }
438 if (available_id != NULL) {
439 FREE_C_HEAP_ARRAY(bool, available_id);
440 }
441 return true;
442 }
443
444 void os::set_native_thread_name(const char *name) {
445 if (Solaris::_pthread_setname_np != NULL) {
446 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
447 // but we explicitly copy into a size-limited buffer to avoid any
448 // possible overflow.
449 char buf[32];
450 snprintf(buf, sizeof(buf), "%s", name);
451 buf[sizeof(buf) - 1] = '\0';
452 Solaris::_pthread_setname_np(pthread_self(), buf);
453 }
454 }
455
456 bool os::distribute_processes(uint length, uint* distribution) {
457 bool result = false;
458 // Find the processor id's of all the available CPUs.
459 processorid_t* id_array = NULL;
460 uint id_length = 0;
461 // There are some races between querying information and using it,
462 // since processor sets can change dynamically.
463 psetid_t pset = PS_NONE;
464 // Are we running in a processor set?
465 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
466 result = find_processors_in_pset(pset, &id_array, &id_length);
467 } else {
468 result = find_processors_online(&id_array, &id_length);
469 }
470 if (result == true) {
471 if (id_length >= length) {
472 result = assign_distribution(id_array, id_length, distribution, length);
473 } else {
474 result = false;
475 }
476 }
477 if (id_array != NULL) {
478 FREE_C_HEAP_ARRAY(processorid_t, id_array);
479 }
480 return result;
481 }
482
483 bool os::bind_to_processor(uint processor_id) {
484 // We assume that a processorid_t can be stored in a uint.
485 assert(sizeof(uint) == sizeof(processorid_t),
486 "can't convert uint to processorid_t");
487 int bind_result =
488 processor_bind(P_LWPID, // bind LWP.
489 P_MYID, // bind current LWP.
490 (processorid_t) processor_id, // id.
491 NULL); // don't return old binding.
492 return (bind_result == 0);
493 }
494
495 // Return true if user is running as root.
496
497 bool os::have_special_privileges() {
498 static bool init = false;
499 static bool privileges = false;
500 if (!init) {
501 privileges = (getuid() != geteuid()) || (getgid() != getegid());
502 init = true;
503 }
504 return privileges;
505 }
506
507
508 void os::init_system_properties_values() {
509 // The next steps are taken in the product version:
510 //
511 // Obtain the JAVA_HOME value from the location of libjvm.so.
512 // This library should be located at:
513 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
514 //
515 // If "/jre/lib/" appears at the right place in the path, then we
516 // assume libjvm.so is installed in a JDK and we use this path.
517 //
518 // Otherwise exit with message: "Could not create the Java virtual machine."
519 //
520 // The following extra steps are taken in the debugging version:
521 //
522 // If "/jre/lib/" does NOT appear at the right place in the path
523 // instead of exit check for $JAVA_HOME environment variable.
524 //
525 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
526 // then we append a fake suffix "hotspot/libjvm.so" to this path so
527 // it looks like libjvm.so is installed there
528 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
529 //
530 // Otherwise exit.
531 //
532 // Important note: if the location of libjvm.so changes this
533 // code needs to be changed accordingly.
534
535 // Base path of extensions installed on the system.
536 #define SYS_EXT_DIR "/usr/jdk/packages"
537 #define EXTENSIONS_DIR "/lib/ext"
538
539 char cpu_arch[12];
540 // Buffer that fits several sprintfs.
541 // Note that the space for the colon and the trailing null are provided
542 // by the nulls included by the sizeof operator.
543 const size_t bufsize =
544 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
545 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
546 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
547 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
548
549 // sysclasspath, java_home, dll_dir
550 {
551 char *pslash;
552 os::jvm_path(buf, bufsize);
553
554 // Found the full path to libjvm.so.
555 // Now cut the path to <java_home>/jre if we can.
556 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
557 pslash = strrchr(buf, '/');
558 if (pslash != NULL) {
559 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
560 }
561 Arguments::set_dll_dir(buf);
562
563 if (pslash != NULL) {
564 pslash = strrchr(buf, '/');
565 if (pslash != NULL) {
566 *pslash = '\0'; // Get rid of /<arch>.
567 pslash = strrchr(buf, '/');
568 if (pslash != NULL) {
569 *pslash = '\0'; // Get rid of /lib.
570 }
571 }
572 }
573 Arguments::set_java_home(buf);
574 set_boot_path('/', ':');
575 }
576
577 // Where to look for native libraries.
578 {
579 // Use dlinfo() to determine the correct java.library.path.
580 //
581 // If we're launched by the Java launcher, and the user
582 // does not set java.library.path explicitly on the commandline,
583 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
584 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
585 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
586 // /usr/lib), which is exactly what we want.
587 //
588 // If the user does set java.library.path, it completely
589 // overwrites this setting, and always has.
590 //
591 // If we're not launched by the Java launcher, we may
592 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
593 // settings. Again, dlinfo does exactly what we want.
594
595 Dl_serinfo info_sz, *info = &info_sz;
596 Dl_serpath *path;
597 char *library_path;
598 char *common_path = buf;
599
600 // Determine search path count and required buffer size.
601 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
602 FREE_C_HEAP_ARRAY(char, buf);
603 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
604 }
605
606 // Allocate new buffer and initialize.
607 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
608 info->dls_size = info_sz.dls_size;
609 info->dls_cnt = info_sz.dls_cnt;
610
611 // Obtain search path information.
612 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
613 FREE_C_HEAP_ARRAY(char, buf);
614 FREE_C_HEAP_ARRAY(char, info);
615 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
616 }
617
618 path = &info->dls_serpath[0];
619
620 // Note: Due to a legacy implementation, most of the library path
621 // is set in the launcher. This was to accomodate linking restrictions
622 // on legacy Solaris implementations (which are no longer supported).
623 // Eventually, all the library path setting will be done here.
624 //
625 // However, to prevent the proliferation of improperly built native
626 // libraries, the new path component /usr/jdk/packages is added here.
627
628 // Determine the actual CPU architecture.
629 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
630 #ifdef _LP64
631 // If we are a 64-bit vm, perform the following translations:
632 // sparc -> sparcv9
633 // i386 -> amd64
634 if (strcmp(cpu_arch, "sparc") == 0) {
635 strcat(cpu_arch, "v9");
636 } else if (strcmp(cpu_arch, "i386") == 0) {
637 strcpy(cpu_arch, "amd64");
638 }
639 #endif
640
641 // Construct the invariant part of ld_library_path.
642 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
643
644 // Struct size is more than sufficient for the path components obtained
645 // through the dlinfo() call, so only add additional space for the path
646 // components explicitly added here.
647 size_t library_path_size = info->dls_size + strlen(common_path);
648 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
649 library_path[0] = '\0';
650
651 // Construct the desired Java library path from the linker's library
652 // search path.
653 //
654 // For compatibility, it is optimal that we insert the additional path
655 // components specific to the Java VM after those components specified
656 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
657 // infrastructure.
658 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
659 strcpy(library_path, common_path);
660 } else {
661 int inserted = 0;
662 int i;
663 for (i = 0; i < info->dls_cnt; i++, path++) {
664 uint_t flags = path->dls_flags & LA_SER_MASK;
665 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
666 strcat(library_path, common_path);
667 strcat(library_path, os::path_separator());
668 inserted = 1;
669 }
670 strcat(library_path, path->dls_name);
671 strcat(library_path, os::path_separator());
672 }
673 // Eliminate trailing path separator.
674 library_path[strlen(library_path)-1] = '\0';
675 }
676
677 // happens before argument parsing - can't use a trace flag
678 // tty->print_raw("init_system_properties_values: native lib path: ");
679 // tty->print_raw_cr(library_path);
680
681 // Callee copies into its own buffer.
682 Arguments::set_library_path(library_path);
683
684 FREE_C_HEAP_ARRAY(char, library_path);
685 FREE_C_HEAP_ARRAY(char, info);
686 }
687
688 // Extensions directories.
689 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
690 Arguments::set_ext_dirs(buf);
691
692 FREE_C_HEAP_ARRAY(char, buf);
693
694 #undef SYS_EXT_DIR
695 #undef EXTENSIONS_DIR
696 }
697
698 void os::breakpoint() {
699 BREAKPOINT;
700 }
701
702 bool os::obsolete_option(const JavaVMOption *option) {
703 if (!strncmp(option->optionString, "-Xt", 3)) {
704 return true;
705 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
706 return true;
707 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
708 return true;
709 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
710 return true;
711 }
712 return false;
713 }
714
715 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
716 address stackStart = (address)thread->stack_base();
717 address stackEnd = (address)(stackStart - (address)thread->stack_size());
718 if (sp < stackStart && sp >= stackEnd) return true;
719 return false;
720 }
721
722 extern "C" void breakpoint() {
723 // use debugger to set breakpoint here
724 }
725
726 static thread_t main_thread;
727
728 // Thread start routine for all newly created threads
729 extern "C" void* thread_native_entry(void* thread_addr) {
730 // Try to randomize the cache line index of hot stack frames.
731 // This helps when threads of the same stack traces evict each other's
732 // cache lines. The threads can be either from the same JVM instance, or
733 // from different JVM instances. The benefit is especially true for
734 // processors with hyperthreading technology.
735 static int counter = 0;
736 int pid = os::current_process_id();
737 alloca(((pid ^ counter++) & 7) * 128);
738
739 int prio;
740 Thread* thread = (Thread*)thread_addr;
741
742 thread->initialize_thread_current();
743
744 OSThread* osthr = thread->osthread();
745
746 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
747 thread->_schedctl = (void *) schedctl_init();
748
749 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
750 os::current_thread_id());
751
752 if (UseNUMA) {
753 int lgrp_id = os::numa_get_group_id();
754 if (lgrp_id != -1) {
755 thread->set_lgrp_id(lgrp_id);
756 }
757 }
758
759 // If the creator called set priority before we started,
760 // we need to call set_native_priority now that we have an lwp.
761 // We used to get the priority from thr_getprio (we called
762 // thr_setprio way back in create_thread) and pass it to
763 // set_native_priority, but Solaris scales the priority
764 // in java_to_os_priority, so when we read it back here,
765 // we pass trash to set_native_priority instead of what's
766 // in java_to_os_priority. So we save the native priority
767 // in the osThread and recall it here.
768
769 if (osthr->thread_id() != -1) {
770 if (UseThreadPriorities) {
771 int prio = osthr->native_priority();
772 if (ThreadPriorityVerbose) {
773 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
774 INTPTR_FORMAT ", setting priority: %d\n",
775 osthr->thread_id(), osthr->lwp_id(), prio);
776 }
777 os::set_native_priority(thread, prio);
778 }
779 } else if (ThreadPriorityVerbose) {
780 warning("Can't set priority in _start routine, thread id hasn't been set\n");
781 }
782
783 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
784
785 // initialize signal mask for this thread
786 os::Solaris::hotspot_sigmask(thread);
787
788 thread->run();
789
790 // One less thread is executing
791 // When the VMThread gets here, the main thread may have already exited
792 // which frees the CodeHeap containing the Atomic::dec code
793 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
794 Atomic::dec(&os::Solaris::_os_thread_count);
795 }
796
797 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
798
799 // If a thread has not deleted itself ("delete this") as part of its
800 // termination sequence, we have to ensure thread-local-storage is
801 // cleared before we actually terminate. No threads should ever be
802 // deleted asynchronously with respect to their termination.
803 if (Thread::current_or_null_safe() != NULL) {
804 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
805 thread->clear_thread_current();
806 }
807
808 if (UseDetachedThreads) {
809 thr_exit(NULL);
810 ShouldNotReachHere();
811 }
812 return NULL;
813 }
814
815 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
816 // Allocate the OSThread object
817 OSThread* osthread = new OSThread(NULL, NULL);
818 if (osthread == NULL) return NULL;
819
820 // Store info on the Solaris thread into the OSThread
821 osthread->set_thread_id(thread_id);
822 osthread->set_lwp_id(_lwp_self());
823 thread->_schedctl = (void *) schedctl_init();
824
825 if (UseNUMA) {
826 int lgrp_id = os::numa_get_group_id();
827 if (lgrp_id != -1) {
828 thread->set_lgrp_id(lgrp_id);
829 }
830 }
831
832 if (ThreadPriorityVerbose) {
833 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
834 osthread->thread_id(), osthread->lwp_id());
835 }
836
837 // Initial thread state is INITIALIZED, not SUSPENDED
838 osthread->set_state(INITIALIZED);
839
840 return osthread;
841 }
842
843 void os::Solaris::hotspot_sigmask(Thread* thread) {
844 //Save caller's signal mask
845 sigset_t sigmask;
846 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
847 OSThread *osthread = thread->osthread();
848 osthread->set_caller_sigmask(sigmask);
849
850 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
851 if (!ReduceSignalUsage) {
852 if (thread->is_VM_thread()) {
853 // Only the VM thread handles BREAK_SIGNAL ...
854 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
855 } else {
856 // ... all other threads block BREAK_SIGNAL
857 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
858 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
859 }
860 }
861 }
862
863 bool os::create_attached_thread(JavaThread* thread) {
864 #ifdef ASSERT
865 thread->verify_not_published();
866 #endif
867 OSThread* osthread = create_os_thread(thread, thr_self());
868 if (osthread == NULL) {
869 return false;
870 }
871
872 // Initial thread state is RUNNABLE
873 osthread->set_state(RUNNABLE);
874 thread->set_osthread(osthread);
875
876 // initialize signal mask for this thread
877 // and save the caller's signal mask
878 os::Solaris::hotspot_sigmask(thread);
879
880 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
881 os::current_thread_id());
882
883 return true;
884 }
885
886 bool os::create_main_thread(JavaThread* thread) {
887 #ifdef ASSERT
888 thread->verify_not_published();
889 #endif
890 if (_starting_thread == NULL) {
891 _starting_thread = create_os_thread(thread, main_thread);
892 if (_starting_thread == NULL) {
893 return false;
894 }
895 }
896
897 // The primodial thread is runnable from the start
898 _starting_thread->set_state(RUNNABLE);
899
900 thread->set_osthread(_starting_thread);
901
902 // initialize signal mask for this thread
903 // and save the caller's signal mask
904 os::Solaris::hotspot_sigmask(thread);
905
906 return true;
907 }
908
909 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
910 static char* describe_thr_create_attributes(char* buf, size_t buflen,
911 size_t stacksize, long flags) {
912 stringStream ss(buf, buflen);
913 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
914 ss.print("flags: ");
915 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
916 #define ALL(X) \
917 X(THR_SUSPENDED) \
918 X(THR_DETACHED) \
919 X(THR_BOUND) \
920 X(THR_NEW_LWP) \
921 X(THR_DAEMON)
922 ALL(PRINT_FLAG)
923 #undef ALL
924 #undef PRINT_FLAG
925 return buf;
926 }
927
928 bool os::create_thread(Thread* thread, ThreadType thr_type,
929 size_t stack_size) {
930 // Allocate the OSThread object
931 OSThread* osthread = new OSThread(NULL, NULL);
932 if (osthread == NULL) {
933 return false;
934 }
935
936 if (ThreadPriorityVerbose) {
937 char *thrtyp;
938 switch (thr_type) {
939 case vm_thread:
940 thrtyp = (char *)"vm";
941 break;
942 case cgc_thread:
943 thrtyp = (char *)"cgc";
944 break;
945 case pgc_thread:
946 thrtyp = (char *)"pgc";
947 break;
948 case java_thread:
949 thrtyp = (char *)"java";
950 break;
951 case compiler_thread:
952 thrtyp = (char *)"compiler";
953 break;
954 case watcher_thread:
955 thrtyp = (char *)"watcher";
956 break;
957 default:
958 thrtyp = (char *)"unknown";
959 break;
960 }
961 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
962 }
963
964 // Calculate stack size if it's not specified by caller.
965 if (stack_size == 0) {
966 // The default stack size 1M (2M for LP64).
967 stack_size = (BytesPerWord >> 2) * K * K;
968
969 switch (thr_type) {
970 case os::java_thread:
971 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
972 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
973 break;
974 case os::compiler_thread:
975 if (CompilerThreadStackSize > 0) {
976 stack_size = (size_t)(CompilerThreadStackSize * K);
977 break;
978 } // else fall through:
979 // use VMThreadStackSize if CompilerThreadStackSize is not defined
980 case os::vm_thread:
981 case os::pgc_thread:
982 case os::cgc_thread:
983 case os::watcher_thread:
984 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
985 break;
986 }
987 }
988 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
989
990 // Initial state is ALLOCATED but not INITIALIZED
991 osthread->set_state(ALLOCATED);
992
993 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
994 // We got lots of threads. Check if we still have some address space left.
995 // Need to be at least 5Mb of unreserved address space. We do check by
996 // trying to reserve some.
997 const size_t VirtualMemoryBangSize = 20*K*K;
998 char* mem = os::reserve_memory(VirtualMemoryBangSize);
999 if (mem == NULL) {
1000 delete osthread;
1001 return false;
1002 } else {
1003 // Release the memory again
1004 os::release_memory(mem, VirtualMemoryBangSize);
1005 }
1006 }
1007
1008 // Setup osthread because the child thread may need it.
1009 thread->set_osthread(osthread);
1010
1011 // Create the Solaris thread
1012 thread_t tid = 0;
1013 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
1014 int status;
1015
1016 // Mark that we don't have an lwp or thread id yet.
1017 // In case we attempt to set the priority before the thread starts.
1018 osthread->set_lwp_id(-1);
1019 osthread->set_thread_id(-1);
1020
1021 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
1022
1023 char buf[64];
1024 if (status == 0) {
1025 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
1026 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1027 } else {
1028 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
1029 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1030 }
1031
1032 if (status != 0) {
1033 thread->set_osthread(NULL);
1034 // Need to clean up stuff we've allocated so far
1035 delete osthread;
1036 return false;
1037 }
1038
1039 Atomic::inc(&os::Solaris::_os_thread_count);
1040
1041 // Store info on the Solaris thread into the OSThread
1042 osthread->set_thread_id(tid);
1043
1044 // Remember that we created this thread so we can set priority on it
1045 osthread->set_vm_created();
1046
1047 // Initial thread state is INITIALIZED, not SUSPENDED
1048 osthread->set_state(INITIALIZED);
1049
1050 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1051 return true;
1052 }
1053
1054 // defined for >= Solaris 10. This allows builds on earlier versions
1055 // of Solaris to take advantage of the newly reserved Solaris JVM signals.
1056 // With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL
1057 // was SIGJVM1.
1058 //
1059 #if !defined(SIGJVM1)
1060 #define SIGJVM1 39
1061 #define SIGJVM2 40
1062 #endif
1063
1064 debug_only(static bool signal_sets_initialized = false);
1065 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1066
1067 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1068
1069 bool os::Solaris::is_sig_ignored(int sig) {
1070 struct sigaction oact;
1071 sigaction(sig, (struct sigaction*)NULL, &oact);
1072 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1073 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1074 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1075 return true;
1076 } else {
1077 return false;
1078 }
1079 }
1080
1081 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1082 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1083 static bool isJVM1available() {
1084 return SIGJVM1 < SIGRTMIN;
1085 }
1086
1087 void os::Solaris::signal_sets_init() {
1088 // Should also have an assertion stating we are still single-threaded.
1089 assert(!signal_sets_initialized, "Already initialized");
1090 // Fill in signals that are necessarily unblocked for all threads in
1091 // the VM. Currently, we unblock the following signals:
1092 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1093 // by -Xrs (=ReduceSignalUsage));
1094 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1095 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1096 // the dispositions or masks wrt these signals.
1097 // Programs embedding the VM that want to use the above signals for their
1098 // own purposes must, at this time, use the "-Xrs" option to prevent
1099 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1100 // (See bug 4345157, and other related bugs).
1101 // In reality, though, unblocking these signals is really a nop, since
1102 // these signals are not blocked by default.
1103 sigemptyset(&unblocked_sigs);
1104 sigemptyset(&allowdebug_blocked_sigs);
1105 sigaddset(&unblocked_sigs, SIGILL);
1106 sigaddset(&unblocked_sigs, SIGSEGV);
1107 sigaddset(&unblocked_sigs, SIGBUS);
1108 sigaddset(&unblocked_sigs, SIGFPE);
1109
1110 // Always true on Solaris 10+
1111 guarantee(isJVM1available(), "SIGJVM1/2 missing!");
1112 os::Solaris::set_SIGasync(SIGJVM2);
1113
1114 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1115
1116 if (!ReduceSignalUsage) {
1117 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1118 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1119 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1120 }
1121 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1122 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1123 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1124 }
1125 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1126 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1127 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1128 }
1129 }
1130 // Fill in signals that are blocked by all but the VM thread.
1131 sigemptyset(&vm_sigs);
1132 if (!ReduceSignalUsage) {
1133 sigaddset(&vm_sigs, BREAK_SIGNAL);
1134 }
1135 debug_only(signal_sets_initialized = true);
1136
1137 // For diagnostics only used in run_periodic_checks
1138 sigemptyset(&check_signal_done);
1139 }
1140
1141 // These are signals that are unblocked while a thread is running Java.
1142 // (For some reason, they get blocked by default.)
1143 sigset_t* os::Solaris::unblocked_signals() {
1144 assert(signal_sets_initialized, "Not initialized");
1145 return &unblocked_sigs;
1146 }
1147
1148 // These are the signals that are blocked while a (non-VM) thread is
1149 // running Java. Only the VM thread handles these signals.
1150 sigset_t* os::Solaris::vm_signals() {
1151 assert(signal_sets_initialized, "Not initialized");
1152 return &vm_sigs;
1153 }
1154
1155 // These are signals that are blocked during cond_wait to allow debugger in
1156 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1157 assert(signal_sets_initialized, "Not initialized");
1158 return &allowdebug_blocked_sigs;
1159 }
1160
1161
1162 void _handle_uncaught_cxx_exception() {
1163 VMError::report_and_die("An uncaught C++ exception");
1164 }
1165
1166
1167 // First crack at OS-specific initialization, from inside the new thread.
1168 void os::initialize_thread(Thread* thr) {
1169 int r = thr_main();
1170 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1171 if (r) {
1172 JavaThread* jt = (JavaThread *)thr;
1173 assert(jt != NULL, "Sanity check");
1174 size_t stack_size;
1175 address base = jt->stack_base();
1176 if (Arguments::created_by_java_launcher()) {
1177 // Use 2MB to allow for Solaris 7 64 bit mode.
1178 stack_size = JavaThread::stack_size_at_create() == 0
1179 ? 2048*K : JavaThread::stack_size_at_create();
1180
1181 // There are rare cases when we may have already used more than
1182 // the basic stack size allotment before this method is invoked.
1183 // Attempt to allow for a normally sized java_stack.
1184 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1185 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1186 } else {
1187 // 6269555: If we were not created by a Java launcher, i.e. if we are
1188 // running embedded in a native application, treat the primordial thread
1189 // as much like a native attached thread as possible. This means using
1190 // the current stack size from thr_stksegment(), unless it is too large
1191 // to reliably setup guard pages. A reasonable max size is 8MB.
1192 size_t current_size = current_stack_size();
1193 // This should never happen, but just in case....
1194 if (current_size == 0) current_size = 2 * K * K;
1195 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1196 }
1197 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1198 stack_size = (size_t)(base - bottom);
1199
1200 assert(stack_size > 0, "Stack size calculation problem");
1201
1202 if (stack_size > jt->stack_size()) {
1203 #ifndef PRODUCT
1204 struct rlimit limits;
1205 getrlimit(RLIMIT_STACK, &limits);
1206 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1207 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1208 #endif
1209 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1210 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1211 "See limit(1) to increase the stack size limit.",
1212 stack_size / K, jt->stack_size() / K);
1213 vm_exit(1);
1214 }
1215 assert(jt->stack_size() >= stack_size,
1216 "Attempt to map more stack than was allocated");
1217 jt->set_stack_size(stack_size);
1218 }
1219
1220 // With the T2 libthread (T1 is no longer supported) threads are always bound
1221 // and we use stackbanging in all cases.
1222
1223 os::Solaris::init_thread_fpu_state();
1224 std::set_terminate(_handle_uncaught_cxx_exception);
1225 }
1226
1227
1228
1229 // Free Solaris resources related to the OSThread
1230 void os::free_thread(OSThread* osthread) {
1231 assert(osthread != NULL, "os::free_thread but osthread not set");
1232
1233 // We are told to free resources of the argument thread,
1234 // but we can only really operate on the current thread.
1235 assert(Thread::current()->osthread() == osthread,
1236 "os::free_thread but not current thread");
1237
1238 // Restore caller's signal mask
1239 sigset_t sigmask = osthread->caller_sigmask();
1240 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1241
1242 delete osthread;
1243 }
1244
1245 void os::pd_start_thread(Thread* thread) {
1246 int status = thr_continue(thread->osthread()->thread_id());
1247 assert_status(status == 0, status, "thr_continue failed");
1248 }
1249
1250
1251 intx os::current_thread_id() {
1252 return (intx)thr_self();
1253 }
1254
1255 static pid_t _initial_pid = 0;
1256
1257 int os::current_process_id() {
1258 return (int)(_initial_pid ? _initial_pid : getpid());
1259 }
1260
1261 // gethrtime() should be monotonic according to the documentation,
1262 // but some virtualized platforms are known to break this guarantee.
1263 // getTimeNanos() must be guaranteed not to move backwards, so we
1264 // are forced to add a check here.
1265 inline hrtime_t getTimeNanos() {
1266 const hrtime_t now = gethrtime();
1267 const hrtime_t prev = max_hrtime;
1268 if (now <= prev) {
1269 return prev; // same or retrograde time;
1270 }
1271 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1272 assert(obsv >= prev, "invariant"); // Monotonicity
1273 // If the CAS succeeded then we're done and return "now".
1274 // If the CAS failed and the observed value "obsv" is >= now then
1275 // we should return "obsv". If the CAS failed and now > obsv > prv then
1276 // some other thread raced this thread and installed a new value, in which case
1277 // we could either (a) retry the entire operation, (b) retry trying to install now
1278 // or (c) just return obsv. We use (c). No loop is required although in some cases
1279 // we might discard a higher "now" value in deference to a slightly lower but freshly
1280 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1281 // to (a) or (b) -- and greatly reduces coherence traffic.
1282 // We might also condition (c) on the magnitude of the delta between obsv and now.
1283 // Avoiding excessive CAS operations to hot RW locations is critical.
1284 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1285 return (prev == obsv) ? now : obsv;
1286 }
1287
1288 // Time since start-up in seconds to a fine granularity.
1289 // Used by VMSelfDestructTimer and the MemProfiler.
1290 double os::elapsedTime() {
1291 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1292 }
1293
1294 jlong os::elapsed_counter() {
1295 return (jlong)(getTimeNanos() - first_hrtime);
1296 }
1297
1298 jlong os::elapsed_frequency() {
1299 return hrtime_hz;
1300 }
1301
1302 // Return the real, user, and system times in seconds from an
1303 // arbitrary fixed point in the past.
1304 bool os::getTimesSecs(double* process_real_time,
1305 double* process_user_time,
1306 double* process_system_time) {
1307 struct tms ticks;
1308 clock_t real_ticks = times(&ticks);
1309
1310 if (real_ticks == (clock_t) (-1)) {
1311 return false;
1312 } else {
1313 double ticks_per_second = (double) clock_tics_per_sec;
1314 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1315 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1316 // For consistency return the real time from getTimeNanos()
1317 // converted to seconds.
1318 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1319
1320 return true;
1321 }
1322 }
1323
1324 bool os::supports_vtime() { return true; }
1325
1326 bool os::enable_vtime() {
1327 int fd = ::open("/proc/self/ctl", O_WRONLY);
1328 if (fd == -1) {
1329 return false;
1330 }
1331
1332 long cmd[] = { PCSET, PR_MSACCT };
1333 int res = ::write(fd, cmd, sizeof(long) * 2);
1334 ::close(fd);
1335 if (res != sizeof(long) * 2) {
1336 return false;
1337 }
1338 return true;
1339 }
1340
1341 bool os::vtime_enabled() {
1342 int fd = ::open("/proc/self/status", O_RDONLY);
1343 if (fd == -1) {
1344 return false;
1345 }
1346
1347 pstatus_t status;
1348 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1349 ::close(fd);
1350 if (res != sizeof(pstatus_t)) {
1351 return false;
1352 }
1353 return status.pr_flags & PR_MSACCT;
1354 }
1355
1356 double os::elapsedVTime() {
1357 return (double)gethrvtime() / (double)hrtime_hz;
1358 }
1359
1360 // in-memory timestamp support - has update accuracy of 1ms
1361 typedef void (*_get_nsec_fromepoch_func_t)(hrtime_t*);
1362 static _get_nsec_fromepoch_func_t _get_nsec_fromepoch = NULL;
1363
1364 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1365 jlong os::javaTimeMillis() {
1366 if (_get_nsec_fromepoch != NULL) {
1367 hrtime_t now;
1368 _get_nsec_fromepoch(&now);
1369 return now / NANOSECS_PER_MILLISEC;
1370 }
1371 else {
1372 timeval t;
1373 if (gettimeofday(&t, NULL) == -1) {
1374 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1375 }
1376 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1377 }
1378 }
1379
1380 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1381 timeval t;
1382 // can't use get_nsec_fromepoch here as we need better accuracy than 1ms
1383 if (gettimeofday(&t, NULL) == -1) {
1384 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1385 }
1386 seconds = jlong(t.tv_sec);
1387 nanos = jlong(t.tv_usec) * 1000;
1388 }
1389
1390
1391 jlong os::javaTimeNanos() {
1392 return (jlong)getTimeNanos();
1393 }
1394
1395 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1396 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1397 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1398 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1399 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1400 }
1401
1402 char * os::local_time_string(char *buf, size_t buflen) {
1403 struct tm t;
1404 time_t long_time;
1405 time(&long_time);
1406 localtime_r(&long_time, &t);
1407 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1408 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1409 t.tm_hour, t.tm_min, t.tm_sec);
1410 return buf;
1411 }
1412
1413 // Note: os::shutdown() might be called very early during initialization, or
1414 // called from signal handler. Before adding something to os::shutdown(), make
1415 // sure it is async-safe and can handle partially initialized VM.
1416 void os::shutdown() {
1417
1418 // allow PerfMemory to attempt cleanup of any persistent resources
1419 perfMemory_exit();
1420
1421 // needs to remove object in file system
1422 AttachListener::abort();
1423
1424 // flush buffered output, finish log files
1425 ostream_abort();
1426
1427 // Check for abort hook
1428 abort_hook_t abort_hook = Arguments::abort_hook();
1429 if (abort_hook != NULL) {
1430 abort_hook();
1431 }
1432 }
1433
1434 // Note: os::abort() might be called very early during initialization, or
1435 // called from signal handler. Before adding something to os::abort(), make
1436 // sure it is async-safe and can handle partially initialized VM.
1437 void os::abort(bool dump_core, void* siginfo, const void* context) {
1438 os::shutdown();
1439 if (dump_core) {
1440 #ifndef PRODUCT
1441 fdStream out(defaultStream::output_fd());
1442 out.print_raw("Current thread is ");
1443 char buf[16];
1444 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1445 out.print_raw_cr(buf);
1446 out.print_raw_cr("Dumping core ...");
1447 #endif
1448 ::abort(); // dump core (for debugging)
1449 }
1450
1451 ::exit(1);
1452 }
1453
1454 // Die immediately, no exit hook, no abort hook, no cleanup.
1455 void os::die() {
1456 ::abort(); // dump core (for debugging)
1457 }
1458
1459 // DLL functions
1460
1461 const char* os::dll_file_extension() { return ".so"; }
1462
1463 // This must be hard coded because it's the system's temporary
1464 // directory not the java application's temp directory, ala java.io.tmpdir.
1465 const char* os::get_temp_directory() { return "/tmp"; }
1466
1467 static bool file_exists(const char* filename) {
1468 struct stat statbuf;
1469 if (filename == NULL || strlen(filename) == 0) {
1470 return false;
1471 }
1472 return os::stat(filename, &statbuf) == 0;
1473 }
1474
1475 bool os::dll_build_name(char* buffer, size_t buflen,
1476 const char* pname, const char* fname) {
1477 bool retval = false;
1478 const size_t pnamelen = pname ? strlen(pname) : 0;
1479
1480 // Return error on buffer overflow.
1481 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1482 return retval;
1483 }
1484
1485 if (pnamelen == 0) {
1486 snprintf(buffer, buflen, "lib%s.so", fname);
1487 retval = true;
1488 } else if (strchr(pname, *os::path_separator()) != NULL) {
1489 int n;
1490 char** pelements = split_path(pname, &n);
1491 if (pelements == NULL) {
1492 return false;
1493 }
1494 for (int i = 0; i < n; i++) {
1495 // really shouldn't be NULL but what the heck, check can't hurt
1496 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1497 continue; // skip the empty path values
1498 }
1499 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1500 if (file_exists(buffer)) {
1501 retval = true;
1502 break;
1503 }
1504 }
1505 // release the storage
1506 for (int i = 0; i < n; i++) {
1507 if (pelements[i] != NULL) {
1508 FREE_C_HEAP_ARRAY(char, pelements[i]);
1509 }
1510 }
1511 if (pelements != NULL) {
1512 FREE_C_HEAP_ARRAY(char*, pelements);
1513 }
1514 } else {
1515 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1516 retval = true;
1517 }
1518 return retval;
1519 }
1520
1521 // check if addr is inside libjvm.so
1522 bool os::address_is_in_vm(address addr) {
1523 static address libjvm_base_addr;
1524 Dl_info dlinfo;
1525
1526 if (libjvm_base_addr == NULL) {
1527 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1528 libjvm_base_addr = (address)dlinfo.dli_fbase;
1529 }
1530 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1531 }
1532
1533 if (dladdr((void *)addr, &dlinfo) != 0) {
1534 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1535 }
1536
1537 return false;
1538 }
1539
1540 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1541 static dladdr1_func_type dladdr1_func = NULL;
1542
1543 bool os::dll_address_to_function_name(address addr, char *buf,
1544 int buflen, int * offset,
1545 bool demangle) {
1546 // buf is not optional, but offset is optional
1547 assert(buf != NULL, "sanity check");
1548
1549 Dl_info dlinfo;
1550
1551 // dladdr1_func was initialized in os::init()
1552 if (dladdr1_func != NULL) {
1553 // yes, we have dladdr1
1554
1555 // Support for dladdr1 is checked at runtime; it may be
1556 // available even if the vm is built on a machine that does
1557 // not have dladdr1 support. Make sure there is a value for
1558 // RTLD_DL_SYMENT.
1559 #ifndef RTLD_DL_SYMENT
1560 #define RTLD_DL_SYMENT 1
1561 #endif
1562 #ifdef _LP64
1563 Elf64_Sym * info;
1564 #else
1565 Elf32_Sym * info;
1566 #endif
1567 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1568 RTLD_DL_SYMENT) != 0) {
1569 // see if we have a matching symbol that covers our address
1570 if (dlinfo.dli_saddr != NULL &&
1571 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1572 if (dlinfo.dli_sname != NULL) {
1573 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1574 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1575 }
1576 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1577 return true;
1578 }
1579 }
1580 // no matching symbol so try for just file info
1581 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1582 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1583 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1584 return true;
1585 }
1586 }
1587 }
1588 buf[0] = '\0';
1589 if (offset != NULL) *offset = -1;
1590 return false;
1591 }
1592
1593 // no, only dladdr is available
1594 if (dladdr((void *)addr, &dlinfo) != 0) {
1595 // see if we have a matching symbol
1596 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1597 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1598 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1599 }
1600 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1601 return true;
1602 }
1603 // no matching symbol so try for just file info
1604 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1605 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1606 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1607 return true;
1608 }
1609 }
1610 }
1611 buf[0] = '\0';
1612 if (offset != NULL) *offset = -1;
1613 return false;
1614 }
1615
1616 bool os::dll_address_to_library_name(address addr, char* buf,
1617 int buflen, int* offset) {
1618 // buf is not optional, but offset is optional
1619 assert(buf != NULL, "sanity check");
1620
1621 Dl_info dlinfo;
1622
1623 if (dladdr((void*)addr, &dlinfo) != 0) {
1624 if (dlinfo.dli_fname != NULL) {
1625 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1626 }
1627 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1628 *offset = addr - (address)dlinfo.dli_fbase;
1629 }
1630 return true;
1631 }
1632
1633 buf[0] = '\0';
1634 if (offset) *offset = -1;
1635 return false;
1636 }
1637
1638 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1639 Dl_info dli;
1640 // Sanity check?
1641 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1642 dli.dli_fname == NULL) {
1643 return 1;
1644 }
1645
1646 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1647 if (handle == NULL) {
1648 return 1;
1649 }
1650
1651 Link_map *map;
1652 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1653 if (map == NULL) {
1654 dlclose(handle);
1655 return 1;
1656 }
1657
1658 while (map->l_prev != NULL) {
1659 map = map->l_prev;
1660 }
1661
1662 while (map != NULL) {
1663 // Iterate through all map entries and call callback with fields of interest
1664 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1665 dlclose(handle);
1666 return 1;
1667 }
1668 map = map->l_next;
1669 }
1670
1671 dlclose(handle);
1672 return 0;
1673 }
1674
1675 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1676 outputStream * out = (outputStream *) param;
1677 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1678 return 0;
1679 }
1680
1681 void os::print_dll_info(outputStream * st) {
1682 st->print_cr("Dynamic libraries:"); st->flush();
1683 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1684 st->print_cr("Error: Cannot print dynamic libraries.");
1685 }
1686 }
1687
1688 // Loads .dll/.so and
1689 // in case of error it checks if .dll/.so was built for the
1690 // same architecture as Hotspot is running on
1691
1692 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1693 void * result= ::dlopen(filename, RTLD_LAZY);
1694 if (result != NULL) {
1695 // Successful loading
1696 return result;
1697 }
1698
1699 Elf32_Ehdr elf_head;
1700
1701 // Read system error message into ebuf
1702 // It may or may not be overwritten below
1703 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1704 ebuf[ebuflen-1]='\0';
1705 int diag_msg_max_length=ebuflen-strlen(ebuf);
1706 char* diag_msg_buf=ebuf+strlen(ebuf);
1707
1708 if (diag_msg_max_length==0) {
1709 // No more space in ebuf for additional diagnostics message
1710 return NULL;
1711 }
1712
1713
1714 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1715
1716 if (file_descriptor < 0) {
1717 // Can't open library, report dlerror() message
1718 return NULL;
1719 }
1720
1721 bool failed_to_read_elf_head=
1722 (sizeof(elf_head)!=
1723 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1724
1725 ::close(file_descriptor);
1726 if (failed_to_read_elf_head) {
1727 // file i/o error - report dlerror() msg
1728 return NULL;
1729 }
1730
1731 typedef struct {
1732 Elf32_Half code; // Actual value as defined in elf.h
1733 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1734 char elf_class; // 32 or 64 bit
1735 char endianess; // MSB or LSB
1736 char* name; // String representation
1737 } arch_t;
1738
1739 static const arch_t arch_array[]={
1740 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1741 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1742 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1743 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1744 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1745 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1746 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1747 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1748 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1749 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1750 };
1751
1752 #if (defined IA32)
1753 static Elf32_Half running_arch_code=EM_386;
1754 #elif (defined AMD64)
1755 static Elf32_Half running_arch_code=EM_X86_64;
1756 #elif (defined IA64)
1757 static Elf32_Half running_arch_code=EM_IA_64;
1758 #elif (defined __sparc) && (defined _LP64)
1759 static Elf32_Half running_arch_code=EM_SPARCV9;
1760 #elif (defined __sparc) && (!defined _LP64)
1761 static Elf32_Half running_arch_code=EM_SPARC;
1762 #elif (defined __powerpc64__)
1763 static Elf32_Half running_arch_code=EM_PPC64;
1764 #elif (defined __powerpc__)
1765 static Elf32_Half running_arch_code=EM_PPC;
1766 #elif (defined ARM)
1767 static Elf32_Half running_arch_code=EM_ARM;
1768 #else
1769 #error Method os::dll_load requires that one of following is defined:\
1770 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1771 #endif
1772
1773 // Identify compatability class for VM's architecture and library's architecture
1774 // Obtain string descriptions for architectures
1775
1776 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1777 int running_arch_index=-1;
1778
1779 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1780 if (running_arch_code == arch_array[i].code) {
1781 running_arch_index = i;
1782 }
1783 if (lib_arch.code == arch_array[i].code) {
1784 lib_arch.compat_class = arch_array[i].compat_class;
1785 lib_arch.name = arch_array[i].name;
1786 }
1787 }
1788
1789 assert(running_arch_index != -1,
1790 "Didn't find running architecture code (running_arch_code) in arch_array");
1791 if (running_arch_index == -1) {
1792 // Even though running architecture detection failed
1793 // we may still continue with reporting dlerror() message
1794 return NULL;
1795 }
1796
1797 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1798 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1799 return NULL;
1800 }
1801
1802 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1803 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1804 return NULL;
1805 }
1806
1807 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1808 if (lib_arch.name!=NULL) {
1809 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1810 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1811 lib_arch.name, arch_array[running_arch_index].name);
1812 } else {
1813 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1814 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1815 lib_arch.code,
1816 arch_array[running_arch_index].name);
1817 }
1818 }
1819
1820 return NULL;
1821 }
1822
1823 void* os::dll_lookup(void* handle, const char* name) {
1824 return dlsym(handle, name);
1825 }
1826
1827 void* os::get_default_process_handle() {
1828 return (void*)::dlopen(NULL, RTLD_LAZY);
1829 }
1830
1831 int os::stat(const char *path, struct stat *sbuf) {
1832 char pathbuf[MAX_PATH];
1833 if (strlen(path) > MAX_PATH - 1) {
1834 errno = ENAMETOOLONG;
1835 return -1;
1836 }
1837 os::native_path(strcpy(pathbuf, path));
1838 return ::stat(pathbuf, sbuf);
1839 }
1840
1841 static inline time_t get_mtime(const char* filename) {
1842 struct stat st;
1843 int ret = os::stat(filename, &st);
1844 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1845 return st.st_mtime;
1846 }
1847
1848 int os::compare_file_modified_times(const char* file1, const char* file2) {
1849 time_t t1 = get_mtime(file1);
1850 time_t t2 = get_mtime(file2);
1851 return t1 - t2;
1852 }
1853
1854 static bool _print_ascii_file(const char* filename, outputStream* st) {
1855 int fd = ::open(filename, O_RDONLY);
1856 if (fd == -1) {
1857 return false;
1858 }
1859
1860 char buf[32];
1861 int bytes;
1862 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1863 st->print_raw(buf, bytes);
1864 }
1865
1866 ::close(fd);
1867
1868 return true;
1869 }
1870
1871 void os::print_os_info_brief(outputStream* st) {
1872 os::Solaris::print_distro_info(st);
1873
1874 os::Posix::print_uname_info(st);
1875
1876 os::Solaris::print_libversion_info(st);
1877 }
1878
1879 void os::print_os_info(outputStream* st) {
1880 st->print("OS:");
1881
1882 os::Solaris::print_distro_info(st);
1883
1884 os::Posix::print_uname_info(st);
1885
1886 os::Solaris::print_libversion_info(st);
1887
1888 os::Posix::print_rlimit_info(st);
1889
1890 os::Posix::print_load_average(st);
1891 }
1892
1893 void os::Solaris::print_distro_info(outputStream* st) {
1894 if (!_print_ascii_file("/etc/release", st)) {
1895 st->print("Solaris");
1896 }
1897 st->cr();
1898 }
1899
1900 void os::get_summary_os_info(char* buf, size_t buflen) {
1901 strncpy(buf, "Solaris", buflen); // default to plain solaris
1902 FILE* fp = fopen("/etc/release", "r");
1903 if (fp != NULL) {
1904 char tmp[256];
1905 // Only get the first line and chop out everything but the os name.
1906 if (fgets(tmp, sizeof(tmp), fp)) {
1907 char* ptr = tmp;
1908 // skip past whitespace characters
1909 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1910 if (*ptr != '\0') {
1911 char* nl = strchr(ptr, '\n');
1912 if (nl != NULL) *nl = '\0';
1913 strncpy(buf, ptr, buflen);
1914 }
1915 }
1916 fclose(fp);
1917 }
1918 }
1919
1920 void os::Solaris::print_libversion_info(outputStream* st) {
1921 st->print(" (T2 libthread)");
1922 st->cr();
1923 }
1924
1925 static bool check_addr0(outputStream* st) {
1926 jboolean status = false;
1927 const int read_chunk = 200;
1928 int ret = 0;
1929 int nmap = 0;
1930 int fd = ::open("/proc/self/map",O_RDONLY);
1931 if (fd >= 0) {
1932 prmap_t *p = NULL;
1933 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1934 if (NULL == mbuff) {
1935 ::close(fd);
1936 return status;
1937 }
1938 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1939 //check if read() has not read partial data
1940 if( 0 != ret % sizeof(prmap_t)){
1941 break;
1942 }
1943 nmap = ret / sizeof(prmap_t);
1944 p = (prmap_t *)mbuff;
1945 for(int i = 0; i < nmap; i++){
1946 if (p->pr_vaddr == 0x0) {
1947 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1948 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1949 st->print("Access: ");
1950 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1951 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1952 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1953 st->cr();
1954 status = true;
1955 }
1956 p++;
1957 }
1958 }
1959 free(mbuff);
1960 ::close(fd);
1961 }
1962 return status;
1963 }
1964
1965 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1966 // Get MHz with system call. We don't seem to already have this.
1967 processor_info_t stats;
1968 processorid_t id = getcpuid();
1969 int clock = 0;
1970 if (processor_info(id, &stats) != -1) {
1971 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1972 }
1973 #ifdef AMD64
1974 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1975 #else
1976 // must be sparc
1977 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1978 #endif
1979 }
1980
1981 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1982 // Nothing to do for now.
1983 }
1984
1985 void os::print_memory_info(outputStream* st) {
1986 st->print("Memory:");
1987 st->print(" %dk page", os::vm_page_size()>>10);
1988 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1989 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1990 st->cr();
1991 (void) check_addr0(st);
1992 }
1993
1994 // Moved from whole group, because we need them here for diagnostic
1995 // prints.
1996 #define OLDMAXSIGNUM 32
1997 static int Maxsignum = 0;
1998 static int *ourSigFlags = NULL;
1999
2000 int os::Solaris::get_our_sigflags(int sig) {
2001 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2002 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2003 return ourSigFlags[sig];
2004 }
2005
2006 void os::Solaris::set_our_sigflags(int sig, int flags) {
2007 assert(ourSigFlags!=NULL, "signal data structure not initialized");
2008 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
2009 ourSigFlags[sig] = flags;
2010 }
2011
2012
2013 static const char* get_signal_handler_name(address handler,
2014 char* buf, int buflen) {
2015 int offset;
2016 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2017 if (found) {
2018 // skip directory names
2019 const char *p1, *p2;
2020 p1 = buf;
2021 size_t len = strlen(os::file_separator());
2022 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2023 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2024 } else {
2025 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2026 }
2027 return buf;
2028 }
2029
2030 static void print_signal_handler(outputStream* st, int sig,
2031 char* buf, size_t buflen) {
2032 struct sigaction sa;
2033
2034 sigaction(sig, NULL, &sa);
2035
2036 st->print("%s: ", os::exception_name(sig, buf, buflen));
2037
2038 address handler = (sa.sa_flags & SA_SIGINFO)
2039 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2040 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2041
2042 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2043 st->print("SIG_DFL");
2044 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2045 st->print("SIG_IGN");
2046 } else {
2047 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2048 }
2049
2050 st->print(", sa_mask[0]=");
2051 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2052
2053 address rh = VMError::get_resetted_sighandler(sig);
2054 // May be, handler was resetted by VMError?
2055 if (rh != NULL) {
2056 handler = rh;
2057 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2058 }
2059
2060 st->print(", sa_flags=");
2061 os::Posix::print_sa_flags(st, sa.sa_flags);
2062
2063 // Check: is it our handler?
2064 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
2065 // It is our signal handler
2066 // check for flags
2067 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2068 st->print(
2069 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2070 os::Solaris::get_our_sigflags(sig));
2071 }
2072 }
2073 st->cr();
2074 }
2075
2076 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2077 st->print_cr("Signal Handlers:");
2078 print_signal_handler(st, SIGSEGV, buf, buflen);
2079 print_signal_handler(st, SIGBUS , buf, buflen);
2080 print_signal_handler(st, SIGFPE , buf, buflen);
2081 print_signal_handler(st, SIGPIPE, buf, buflen);
2082 print_signal_handler(st, SIGXFSZ, buf, buflen);
2083 print_signal_handler(st, SIGILL , buf, buflen);
2084 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2085 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2086 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2087 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2088 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2089 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2090 }
2091
2092 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2093
2094 // Find the full path to the current module, libjvm.so
2095 void os::jvm_path(char *buf, jint buflen) {
2096 // Error checking.
2097 if (buflen < MAXPATHLEN) {
2098 assert(false, "must use a large-enough buffer");
2099 buf[0] = '\0';
2100 return;
2101 }
2102 // Lazy resolve the path to current module.
2103 if (saved_jvm_path[0] != 0) {
2104 strcpy(buf, saved_jvm_path);
2105 return;
2106 }
2107
2108 Dl_info dlinfo;
2109 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2110 assert(ret != 0, "cannot locate libjvm");
2111 if (ret != 0 && dlinfo.dli_fname != NULL) {
2112 realpath((char *)dlinfo.dli_fname, buf);
2113 } else {
2114 buf[0] = '\0';
2115 return;
2116 }
2117
2118 if (Arguments::sun_java_launcher_is_altjvm()) {
2119 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2120 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2121 // If "/jre/lib/" appears at the right place in the string, then
2122 // assume we are installed in a JDK and we're done. Otherwise, check
2123 // for a JAVA_HOME environment variable and fix up the path so it
2124 // looks like libjvm.so is installed there (append a fake suffix
2125 // hotspot/libjvm.so).
2126 const char *p = buf + strlen(buf) - 1;
2127 for (int count = 0; p > buf && count < 5; ++count) {
2128 for (--p; p > buf && *p != '/'; --p)
2129 /* empty */ ;
2130 }
2131
2132 if (strncmp(p, "/jre/lib/", 9) != 0) {
2133 // Look for JAVA_HOME in the environment.
2134 char* java_home_var = ::getenv("JAVA_HOME");
2135 if (java_home_var != NULL && java_home_var[0] != 0) {
2136 char cpu_arch[12];
2137 char* jrelib_p;
2138 int len;
2139 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2140 #ifdef _LP64
2141 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2142 if (strcmp(cpu_arch, "sparc") == 0) {
2143 strcat(cpu_arch, "v9");
2144 } else if (strcmp(cpu_arch, "i386") == 0) {
2145 strcpy(cpu_arch, "amd64");
2146 }
2147 #endif
2148 // Check the current module name "libjvm.so".
2149 p = strrchr(buf, '/');
2150 assert(strstr(p, "/libjvm") == p, "invalid library name");
2151
2152 realpath(java_home_var, buf);
2153 // determine if this is a legacy image or modules image
2154 // modules image doesn't have "jre" subdirectory
2155 len = strlen(buf);
2156 assert(len < buflen, "Ran out of buffer space");
2157 jrelib_p = buf + len;
2158 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2159 if (0 != access(buf, F_OK)) {
2160 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2161 }
2162
2163 if (0 == access(buf, F_OK)) {
2164 // Use current module name "libjvm.so"
2165 len = strlen(buf);
2166 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2167 } else {
2168 // Go back to path of .so
2169 realpath((char *)dlinfo.dli_fname, buf);
2170 }
2171 }
2172 }
2173 }
2174
2175 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2176 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2177 }
2178
2179
2180 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2181 // no prefix required, not even "_"
2182 }
2183
2184
2185 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2186 // no suffix required
2187 }
2188
2189 // This method is a copy of JDK's sysGetLastErrorString
2190 // from src/solaris/hpi/src/system_md.c
2191
2192 size_t os::lasterror(char *buf, size_t len) {
2193 if (errno == 0) return 0;
2194
2195 const char *s = os::strerror(errno);
2196 size_t n = ::strlen(s);
2197 if (n >= len) {
2198 n = len - 1;
2199 }
2200 ::strncpy(buf, s, n);
2201 buf[n] = '\0';
2202 return n;
2203 }
2204
2205
2206 // sun.misc.Signal
2207
2208 extern "C" {
2209 static void UserHandler(int sig, void *siginfo, void *context) {
2210 // Ctrl-C is pressed during error reporting, likely because the error
2211 // handler fails to abort. Let VM die immediately.
2212 if (sig == SIGINT && is_error_reported()) {
2213 os::die();
2214 }
2215
2216 os::signal_notify(sig);
2217 // We do not need to reinstate the signal handler each time...
2218 }
2219 }
2220
2221 void* os::user_handler() {
2222 return CAST_FROM_FN_PTR(void*, UserHandler);
2223 }
2224
2225 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2226 struct timespec ts;
2227 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2228
2229 return ts;
2230 }
2231
2232 extern "C" {
2233 typedef void (*sa_handler_t)(int);
2234 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2235 }
2236
2237 void* os::signal(int signal_number, void* handler) {
2238 struct sigaction sigAct, oldSigAct;
2239 sigfillset(&(sigAct.sa_mask));
2240 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2241 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2242
2243 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2244 // -1 means registration failed
2245 return (void *)-1;
2246 }
2247
2248 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2249 }
2250
2251 void os::signal_raise(int signal_number) {
2252 raise(signal_number);
2253 }
2254
2255 // The following code is moved from os.cpp for making this
2256 // code platform specific, which it is by its very nature.
2257
2258 // a counter for each possible signal value
2259 static int Sigexit = 0;
2260 static int Maxlibjsigsigs;
2261 static jint *pending_signals = NULL;
2262 static int *preinstalled_sigs = NULL;
2263 static struct sigaction *chainedsigactions = NULL;
2264 static sema_t sig_sem;
2265 typedef int (*version_getting_t)();
2266 version_getting_t os::Solaris::get_libjsig_version = NULL;
2267 static int libjsigversion = NULL;
2268
2269 int os::sigexitnum_pd() {
2270 assert(Sigexit > 0, "signal memory not yet initialized");
2271 return Sigexit;
2272 }
2273
2274 void os::Solaris::init_signal_mem() {
2275 // Initialize signal structures
2276 Maxsignum = SIGRTMAX;
2277 Sigexit = Maxsignum+1;
2278 assert(Maxsignum >0, "Unable to obtain max signal number");
2279
2280 Maxlibjsigsigs = Maxsignum;
2281
2282 // pending_signals has one int per signal
2283 // The additional signal is for SIGEXIT - exit signal to signal_thread
2284 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2285 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2286
2287 if (UseSignalChaining) {
2288 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2289 * (Maxsignum + 1), mtInternal);
2290 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2291 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2292 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2293 }
2294 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2295 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2296 }
2297
2298 void os::signal_init_pd() {
2299 int ret;
2300
2301 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2302 assert(ret == 0, "sema_init() failed");
2303 }
2304
2305 void os::signal_notify(int signal_number) {
2306 int ret;
2307
2308 Atomic::inc(&pending_signals[signal_number]);
2309 ret = ::sema_post(&sig_sem);
2310 assert(ret == 0, "sema_post() failed");
2311 }
2312
2313 static int check_pending_signals(bool wait_for_signal) {
2314 int ret;
2315 while (true) {
2316 for (int i = 0; i < Sigexit + 1; i++) {
2317 jint n = pending_signals[i];
2318 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2319 return i;
2320 }
2321 }
2322 if (!wait_for_signal) {
2323 return -1;
2324 }
2325 JavaThread *thread = JavaThread::current();
2326 ThreadBlockInVM tbivm(thread);
2327
2328 bool threadIsSuspended;
2329 do {
2330 thread->set_suspend_equivalent();
2331 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2332 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2333 ;
2334 assert(ret == 0, "sema_wait() failed");
2335
2336 // were we externally suspended while we were waiting?
2337 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2338 if (threadIsSuspended) {
2339 // The semaphore has been incremented, but while we were waiting
2340 // another thread suspended us. We don't want to continue running
2341 // while suspended because that would surprise the thread that
2342 // suspended us.
2343 ret = ::sema_post(&sig_sem);
2344 assert(ret == 0, "sema_post() failed");
2345
2346 thread->java_suspend_self();
2347 }
2348 } while (threadIsSuspended);
2349 }
2350 }
2351
2352 int os::signal_lookup() {
2353 return check_pending_signals(false);
2354 }
2355
2356 int os::signal_wait() {
2357 return check_pending_signals(true);
2358 }
2359
2360 ////////////////////////////////////////////////////////////////////////////////
2361 // Virtual Memory
2362
2363 static int page_size = -1;
2364
2365 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2366 // clear this var if support is not available.
2367 static bool has_map_align = true;
2368
2369 int os::vm_page_size() {
2370 assert(page_size != -1, "must call os::init");
2371 return page_size;
2372 }
2373
2374 // Solaris allocates memory by pages.
2375 int os::vm_allocation_granularity() {
2376 assert(page_size != -1, "must call os::init");
2377 return page_size;
2378 }
2379
2380 static bool recoverable_mmap_error(int err) {
2381 // See if the error is one we can let the caller handle. This
2382 // list of errno values comes from the Solaris mmap(2) man page.
2383 switch (err) {
2384 case EBADF:
2385 case EINVAL:
2386 case ENOTSUP:
2387 // let the caller deal with these errors
2388 return true;
2389
2390 default:
2391 // Any remaining errors on this OS can cause our reserved mapping
2392 // to be lost. That can cause confusion where different data
2393 // structures think they have the same memory mapped. The worst
2394 // scenario is if both the VM and a library think they have the
2395 // same memory mapped.
2396 return false;
2397 }
2398 }
2399
2400 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2401 int err) {
2402 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2403 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2404 os::strerror(err), err);
2405 }
2406
2407 static void warn_fail_commit_memory(char* addr, size_t bytes,
2408 size_t alignment_hint, bool exec,
2409 int err) {
2410 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2411 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2412 alignment_hint, exec, os::strerror(err), err);
2413 }
2414
2415 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2416 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2417 size_t size = bytes;
2418 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2419 if (res != NULL) {
2420 if (UseNUMAInterleaving) {
2421 numa_make_global(addr, bytes);
2422 }
2423 return 0;
2424 }
2425
2426 int err = errno; // save errno from mmap() call in mmap_chunk()
2427
2428 if (!recoverable_mmap_error(err)) {
2429 warn_fail_commit_memory(addr, bytes, exec, err);
2430 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2431 }
2432
2433 return err;
2434 }
2435
2436 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2437 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2438 }
2439
2440 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2441 const char* mesg) {
2442 assert(mesg != NULL, "mesg must be specified");
2443 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2444 if (err != 0) {
2445 // the caller wants all commit errors to exit with the specified mesg:
2446 warn_fail_commit_memory(addr, bytes, exec, err);
2447 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2448 }
2449 }
2450
2451 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2452 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2453 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2454 alignment, (size_t) vm_page_size());
2455
2456 for (int i = 0; _page_sizes[i] != 0; i++) {
2457 if (is_size_aligned(alignment, _page_sizes[i])) {
2458 return _page_sizes[i];
2459 }
2460 }
2461
2462 return (size_t) vm_page_size();
2463 }
2464
2465 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2466 size_t alignment_hint, bool exec) {
2467 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2468 if (err == 0 && UseLargePages && alignment_hint > 0) {
2469 assert(is_size_aligned(bytes, alignment_hint),
2470 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2471
2472 // The syscall memcntl requires an exact page size (see man memcntl for details).
2473 size_t page_size = page_size_for_alignment(alignment_hint);
2474 if (page_size > (size_t) vm_page_size()) {
2475 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2476 }
2477 }
2478 return err;
2479 }
2480
2481 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2482 bool exec) {
2483 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2484 }
2485
2486 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2487 size_t alignment_hint, bool exec,
2488 const char* mesg) {
2489 assert(mesg != NULL, "mesg must be specified");
2490 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2491 if (err != 0) {
2492 // the caller wants all commit errors to exit with the specified mesg:
2493 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2494 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2495 }
2496 }
2497
2498 // Uncommit the pages in a specified region.
2499 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2500 if (madvise(addr, bytes, MADV_FREE) < 0) {
2501 debug_only(warning("MADV_FREE failed."));
2502 return;
2503 }
2504 }
2505
2506 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2507 return os::commit_memory(addr, size, !ExecMem);
2508 }
2509
2510 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2511 return os::uncommit_memory(addr, size);
2512 }
2513
2514 // Change the page size in a given range.
2515 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2516 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2517 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2518 if (UseLargePages) {
2519 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2520 if (page_size > (size_t) vm_page_size()) {
2521 Solaris::setup_large_pages(addr, bytes, page_size);
2522 }
2523 }
2524 }
2525
2526 // Tell the OS to make the range local to the first-touching LWP
2527 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2528 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2529 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2530 debug_only(warning("MADV_ACCESS_LWP failed."));
2531 }
2532 }
2533
2534 // Tell the OS that this range would be accessed from different LWPs.
2535 void os::numa_make_global(char *addr, size_t bytes) {
2536 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2537 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2538 debug_only(warning("MADV_ACCESS_MANY failed."));
2539 }
2540 }
2541
2542 // Get the number of the locality groups.
2543 size_t os::numa_get_groups_num() {
2544 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2545 return n != -1 ? n : 1;
2546 }
2547
2548 // Get a list of leaf locality groups. A leaf lgroup is group that
2549 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2550 // board. An LWP is assigned to one of these groups upon creation.
2551 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2552 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2553 ids[0] = 0;
2554 return 1;
2555 }
2556 int result_size = 0, top = 1, bottom = 0, cur = 0;
2557 for (int k = 0; k < size; k++) {
2558 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2559 (Solaris::lgrp_id_t*)&ids[top], size - top);
2560 if (r == -1) {
2561 ids[0] = 0;
2562 return 1;
2563 }
2564 if (!r) {
2565 // That's a leaf node.
2566 assert(bottom <= cur, "Sanity check");
2567 // Check if the node has memory
2568 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2569 NULL, 0, LGRP_RSRC_MEM) > 0) {
2570 ids[bottom++] = ids[cur];
2571 }
2572 }
2573 top += r;
2574 cur++;
2575 }
2576 if (bottom == 0) {
2577 // Handle a situation, when the OS reports no memory available.
2578 // Assume UMA architecture.
2579 ids[0] = 0;
2580 return 1;
2581 }
2582 return bottom;
2583 }
2584
2585 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2586 bool os::numa_topology_changed() {
2587 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2588 if (is_stale != -1 && is_stale) {
2589 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2590 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2591 assert(c != 0, "Failure to initialize LGRP API");
2592 Solaris::set_lgrp_cookie(c);
2593 return true;
2594 }
2595 return false;
2596 }
2597
2598 // Get the group id of the current LWP.
2599 int os::numa_get_group_id() {
2600 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2601 if (lgrp_id == -1) {
2602 return 0;
2603 }
2604 const int size = os::numa_get_groups_num();
2605 int *ids = (int*)alloca(size * sizeof(int));
2606
2607 // Get the ids of all lgroups with memory; r is the count.
2608 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2609 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2610 if (r <= 0) {
2611 return 0;
2612 }
2613 return ids[os::random() % r];
2614 }
2615
2616 // Request information about the page.
2617 bool os::get_page_info(char *start, page_info* info) {
2618 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2619 uint64_t addr = (uintptr_t)start;
2620 uint64_t outdata[2];
2621 uint_t validity = 0;
2622
2623 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2624 return false;
2625 }
2626
2627 info->size = 0;
2628 info->lgrp_id = -1;
2629
2630 if ((validity & 1) != 0) {
2631 if ((validity & 2) != 0) {
2632 info->lgrp_id = outdata[0];
2633 }
2634 if ((validity & 4) != 0) {
2635 info->size = outdata[1];
2636 }
2637 return true;
2638 }
2639 return false;
2640 }
2641
2642 // Scan the pages from start to end until a page different than
2643 // the one described in the info parameter is encountered.
2644 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2645 page_info* page_found) {
2646 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2647 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2648 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2649 uint_t validity[MAX_MEMINFO_CNT];
2650
2651 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2652 uint64_t p = (uint64_t)start;
2653 while (p < (uint64_t)end) {
2654 addrs[0] = p;
2655 size_t addrs_count = 1;
2656 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2657 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2658 addrs_count++;
2659 }
2660
2661 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2662 return NULL;
2663 }
2664
2665 size_t i = 0;
2666 for (; i < addrs_count; i++) {
2667 if ((validity[i] & 1) != 0) {
2668 if ((validity[i] & 4) != 0) {
2669 if (outdata[types * i + 1] != page_expected->size) {
2670 break;
2671 }
2672 } else if (page_expected->size != 0) {
2673 break;
2674 }
2675
2676 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2677 if (outdata[types * i] != page_expected->lgrp_id) {
2678 break;
2679 }
2680 }
2681 } else {
2682 return NULL;
2683 }
2684 }
2685
2686 if (i < addrs_count) {
2687 if ((validity[i] & 2) != 0) {
2688 page_found->lgrp_id = outdata[types * i];
2689 } else {
2690 page_found->lgrp_id = -1;
2691 }
2692 if ((validity[i] & 4) != 0) {
2693 page_found->size = outdata[types * i + 1];
2694 } else {
2695 page_found->size = 0;
2696 }
2697 return (char*)addrs[i];
2698 }
2699
2700 p = addrs[addrs_count - 1] + page_size;
2701 }
2702 return end;
2703 }
2704
2705 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2706 size_t size = bytes;
2707 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2708 // uncommitted page. Otherwise, the read/write might succeed if we
2709 // have enough swap space to back the physical page.
2710 return
2711 NULL != Solaris::mmap_chunk(addr, size,
2712 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2713 PROT_NONE);
2714 }
2715
2716 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2717 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2718
2719 if (b == MAP_FAILED) {
2720 return NULL;
2721 }
2722 return b;
2723 }
2724
2725 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2726 size_t alignment_hint, bool fixed) {
2727 char* addr = requested_addr;
2728 int flags = MAP_PRIVATE | MAP_NORESERVE;
2729
2730 assert(!(fixed && (alignment_hint > 0)),
2731 "alignment hint meaningless with fixed mmap");
2732
2733 if (fixed) {
2734 flags |= MAP_FIXED;
2735 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2736 flags |= MAP_ALIGN;
2737 addr = (char*) alignment_hint;
2738 }
2739
2740 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2741 // uncommitted page. Otherwise, the read/write might succeed if we
2742 // have enough swap space to back the physical page.
2743 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2744 }
2745
2746 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2747 size_t alignment_hint) {
2748 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2749 (requested_addr != NULL));
2750
2751 guarantee(requested_addr == NULL || requested_addr == addr,
2752 "OS failed to return requested mmap address.");
2753 return addr;
2754 }
2755
2756 // Reserve memory at an arbitrary address, only if that area is
2757 // available (and not reserved for something else).
2758
2759 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2760 const int max_tries = 10;
2761 char* base[max_tries];
2762 size_t size[max_tries];
2763
2764 // Solaris adds a gap between mmap'ed regions. The size of the gap
2765 // is dependent on the requested size and the MMU. Our initial gap
2766 // value here is just a guess and will be corrected later.
2767 bool had_top_overlap = false;
2768 bool have_adjusted_gap = false;
2769 size_t gap = 0x400000;
2770
2771 // Assert only that the size is a multiple of the page size, since
2772 // that's all that mmap requires, and since that's all we really know
2773 // about at this low abstraction level. If we need higher alignment,
2774 // we can either pass an alignment to this method or verify alignment
2775 // in one of the methods further up the call chain. See bug 5044738.
2776 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2777
2778 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2779 // Give it a try, if the kernel honors the hint we can return immediately.
2780 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2781
2782 volatile int err = errno;
2783 if (addr == requested_addr) {
2784 return addr;
2785 } else if (addr != NULL) {
2786 pd_unmap_memory(addr, bytes);
2787 }
2788
2789 if (log_is_enabled(Warning, os)) {
2790 char buf[256];
2791 buf[0] = '\0';
2792 if (addr == NULL) {
2793 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2794 }
2795 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2796 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2797 "%s", bytes, requested_addr, addr, buf);
2798 }
2799
2800 // Address hint method didn't work. Fall back to the old method.
2801 // In theory, once SNV becomes our oldest supported platform, this
2802 // code will no longer be needed.
2803 //
2804 // Repeatedly allocate blocks until the block is allocated at the
2805 // right spot. Give up after max_tries.
2806 int i;
2807 for (i = 0; i < max_tries; ++i) {
2808 base[i] = reserve_memory(bytes);
2809
2810 if (base[i] != NULL) {
2811 // Is this the block we wanted?
2812 if (base[i] == requested_addr) {
2813 size[i] = bytes;
2814 break;
2815 }
2816
2817 // check that the gap value is right
2818 if (had_top_overlap && !have_adjusted_gap) {
2819 size_t actual_gap = base[i-1] - base[i] - bytes;
2820 if (gap != actual_gap) {
2821 // adjust the gap value and retry the last 2 allocations
2822 assert(i > 0, "gap adjustment code problem");
2823 have_adjusted_gap = true; // adjust the gap only once, just in case
2824 gap = actual_gap;
2825 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2826 unmap_memory(base[i], bytes);
2827 unmap_memory(base[i-1], size[i-1]);
2828 i-=2;
2829 continue;
2830 }
2831 }
2832
2833 // Does this overlap the block we wanted? Give back the overlapped
2834 // parts and try again.
2835 //
2836 // There is still a bug in this code: if top_overlap == bytes,
2837 // the overlap is offset from requested region by the value of gap.
2838 // In this case giving back the overlapped part will not work,
2839 // because we'll give back the entire block at base[i] and
2840 // therefore the subsequent allocation will not generate a new gap.
2841 // This could be fixed with a new algorithm that used larger
2842 // or variable size chunks to find the requested region -
2843 // but such a change would introduce additional complications.
2844 // It's rare enough that the planets align for this bug,
2845 // so we'll just wait for a fix for 6204603/5003415 which
2846 // will provide a mmap flag to allow us to avoid this business.
2847
2848 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2849 if (top_overlap >= 0 && top_overlap < bytes) {
2850 had_top_overlap = true;
2851 unmap_memory(base[i], top_overlap);
2852 base[i] += top_overlap;
2853 size[i] = bytes - top_overlap;
2854 } else {
2855 size_t bottom_overlap = base[i] + bytes - requested_addr;
2856 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2857 if (bottom_overlap == 0) {
2858 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2859 }
2860 unmap_memory(requested_addr, bottom_overlap);
2861 size[i] = bytes - bottom_overlap;
2862 } else {
2863 size[i] = bytes;
2864 }
2865 }
2866 }
2867 }
2868
2869 // Give back the unused reserved pieces.
2870
2871 for (int j = 0; j < i; ++j) {
2872 if (base[j] != NULL) {
2873 unmap_memory(base[j], size[j]);
2874 }
2875 }
2876
2877 return (i < max_tries) ? requested_addr : NULL;
2878 }
2879
2880 bool os::pd_release_memory(char* addr, size_t bytes) {
2881 size_t size = bytes;
2882 return munmap(addr, size) == 0;
2883 }
2884
2885 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2886 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2887 "addr must be page aligned");
2888 int retVal = mprotect(addr, bytes, prot);
2889 return retVal == 0;
2890 }
2891
2892 // Protect memory (Used to pass readonly pages through
2893 // JNI GetArray<type>Elements with empty arrays.)
2894 // Also, used for serialization page and for compressed oops null pointer
2895 // checking.
2896 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2897 bool is_committed) {
2898 unsigned int p = 0;
2899 switch (prot) {
2900 case MEM_PROT_NONE: p = PROT_NONE; break;
2901 case MEM_PROT_READ: p = PROT_READ; break;
2902 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2903 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2904 default:
2905 ShouldNotReachHere();
2906 }
2907 // is_committed is unused.
2908 return solaris_mprotect(addr, bytes, p);
2909 }
2910
2911 // guard_memory and unguard_memory only happens within stack guard pages.
2912 // Since ISM pertains only to the heap, guard and unguard memory should not
2913 /// happen with an ISM region.
2914 bool os::guard_memory(char* addr, size_t bytes) {
2915 return solaris_mprotect(addr, bytes, PROT_NONE);
2916 }
2917
2918 bool os::unguard_memory(char* addr, size_t bytes) {
2919 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2920 }
2921
2922 // Large page support
2923 static size_t _large_page_size = 0;
2924
2925 // Insertion sort for small arrays (descending order).
2926 static void insertion_sort_descending(size_t* array, int len) {
2927 for (int i = 0; i < len; i++) {
2928 size_t val = array[i];
2929 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2930 size_t tmp = array[key];
2931 array[key] = array[key - 1];
2932 array[key - 1] = tmp;
2933 }
2934 }
2935 }
2936
2937 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2938 const unsigned int usable_count = VM_Version::page_size_count();
2939 if (usable_count == 1) {
2940 return false;
2941 }
2942
2943 // Find the right getpagesizes interface. When solaris 11 is the minimum
2944 // build platform, getpagesizes() (without the '2') can be called directly.
2945 typedef int (*gps_t)(size_t[], int);
2946 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2947 if (gps_func == NULL) {
2948 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2949 if (gps_func == NULL) {
2950 if (warn) {
2951 warning("MPSS is not supported by the operating system.");
2952 }
2953 return false;
2954 }
2955 }
2956
2957 // Fill the array of page sizes.
2958 int n = (*gps_func)(_page_sizes, page_sizes_max);
2959 assert(n > 0, "Solaris bug?");
2960
2961 if (n == page_sizes_max) {
2962 // Add a sentinel value (necessary only if the array was completely filled
2963 // since it is static (zeroed at initialization)).
2964 _page_sizes[--n] = 0;
2965 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2966 }
2967 assert(_page_sizes[n] == 0, "missing sentinel");
2968 trace_page_sizes("available page sizes", _page_sizes, n);
2969
2970 if (n == 1) return false; // Only one page size available.
2971
2972 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2973 // select up to usable_count elements. First sort the array, find the first
2974 // acceptable value, then copy the usable sizes to the top of the array and
2975 // trim the rest. Make sure to include the default page size :-).
2976 //
2977 // A better policy could get rid of the 4M limit by taking the sizes of the
2978 // important VM memory regions (java heap and possibly the code cache) into
2979 // account.
2980 insertion_sort_descending(_page_sizes, n);
2981 const size_t size_limit =
2982 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2983 int beg;
2984 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2985 const int end = MIN2((int)usable_count, n) - 1;
2986 for (int cur = 0; cur < end; ++cur, ++beg) {
2987 _page_sizes[cur] = _page_sizes[beg];
2988 }
2989 _page_sizes[end] = vm_page_size();
2990 _page_sizes[end + 1] = 0;
2991
2992 if (_page_sizes[end] > _page_sizes[end - 1]) {
2993 // Default page size is not the smallest; sort again.
2994 insertion_sort_descending(_page_sizes, end + 1);
2995 }
2996 *page_size = _page_sizes[0];
2997
2998 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2999 return true;
3000 }
3001
3002 void os::large_page_init() {
3003 if (UseLargePages) {
3004 // print a warning if any large page related flag is specified on command line
3005 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
3006 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
3007
3008 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
3009 }
3010 }
3011
3012 bool os::Solaris::is_valid_page_size(size_t bytes) {
3013 for (int i = 0; _page_sizes[i] != 0; i++) {
3014 if (_page_sizes[i] == bytes) {
3015 return true;
3016 }
3017 }
3018 return false;
3019 }
3020
3021 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3022 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
3023 assert(is_ptr_aligned((void*) start, align),
3024 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
3025 assert(is_size_aligned(bytes, align),
3026 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
3027
3028 // Signal to OS that we want large pages for addresses
3029 // from addr, addr + bytes
3030 struct memcntl_mha mpss_struct;
3031 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3032 mpss_struct.mha_pagesize = align;
3033 mpss_struct.mha_flags = 0;
3034 // Upon successful completion, memcntl() returns 0
3035 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3036 debug_only(warning("Attempt to use MPSS failed."));
3037 return false;
3038 }
3039 return true;
3040 }
3041
3042 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3043 fatal("os::reserve_memory_special should not be called on Solaris.");
3044 return NULL;
3045 }
3046
3047 bool os::release_memory_special(char* base, size_t bytes) {
3048 fatal("os::release_memory_special should not be called on Solaris.");
3049 return false;
3050 }
3051
3052 size_t os::large_page_size() {
3053 return _large_page_size;
3054 }
3055
3056 // MPSS allows application to commit large page memory on demand; with ISM
3057 // the entire memory region must be allocated as shared memory.
3058 bool os::can_commit_large_page_memory() {
3059 return true;
3060 }
3061
3062 bool os::can_execute_large_page_memory() {
3063 return true;
3064 }
3065
3066 // Read calls from inside the vm need to perform state transitions
3067 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3068 size_t res;
3069 JavaThread* thread = (JavaThread*)Thread::current();
3070 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3071 ThreadBlockInVM tbiv(thread);
3072 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3073 return res;
3074 }
3075
3076 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
3077 size_t res;
3078 JavaThread* thread = (JavaThread*)Thread::current();
3079 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3080 ThreadBlockInVM tbiv(thread);
3081 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
3082 return res;
3083 }
3084
3085 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3086 size_t res;
3087 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3088 "Assumed _thread_in_native");
3089 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3090 return res;
3091 }
3092
3093 void os::naked_short_sleep(jlong ms) {
3094 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3095
3096 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3097 // Solaris requires -lrt for this.
3098 usleep((ms * 1000));
3099
3100 return;
3101 }
3102
3103 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3104 void os::infinite_sleep() {
3105 while (true) { // sleep forever ...
3106 ::sleep(100); // ... 100 seconds at a time
3107 }
3108 }
3109
3110 // Used to convert frequent JVM_Yield() to nops
3111 bool os::dont_yield() {
3112 if (DontYieldALot) {
3113 static hrtime_t last_time = 0;
3114 hrtime_t diff = getTimeNanos() - last_time;
3115
3116 if (diff < DontYieldALotInterval * 1000000) {
3117 return true;
3118 }
3119
3120 last_time += diff;
3121
3122 return false;
3123 } else {
3124 return false;
3125 }
3126 }
3127
3128 // Note that yield semantics are defined by the scheduling class to which
3129 // the thread currently belongs. Typically, yield will _not yield to
3130 // other equal or higher priority threads that reside on the dispatch queues
3131 // of other CPUs.
3132
3133 void os::naked_yield() {
3134 thr_yield();
3135 }
3136
3137 // Interface for setting lwp priorities. If we are using T2 libthread,
3138 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3139 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3140 // function is meaningless in this mode so we must adjust the real lwp's priority
3141 // The routines below implement the getting and setting of lwp priorities.
3142 //
3143 // Note: T2 is now the only supported libthread. UseBoundThreads flag is
3144 // being deprecated and all threads are now BoundThreads
3145 //
3146 // Note: There are three priority scales used on Solaris. Java priotities
3147 // which range from 1 to 10, libthread "thr_setprio" scale which range
3148 // from 0 to 127, and the current scheduling class of the process we
3149 // are running in. This is typically from -60 to +60.
3150 // The setting of the lwp priorities in done after a call to thr_setprio
3151 // so Java priorities are mapped to libthread priorities and we map from
3152 // the latter to lwp priorities. We don't keep priorities stored in
3153 // Java priorities since some of our worker threads want to set priorities
3154 // higher than all Java threads.
3155 //
3156 // For related information:
3157 // (1) man -s 2 priocntl
3158 // (2) man -s 4 priocntl
3159 // (3) man dispadmin
3160 // = librt.so
3161 // = libthread/common/rtsched.c - thrp_setlwpprio().
3162 // = ps -cL <pid> ... to validate priority.
3163 // = sched_get_priority_min and _max
3164 // pthread_create
3165 // sched_setparam
3166 // pthread_setschedparam
3167 //
3168 // Assumptions:
3169 // + We assume that all threads in the process belong to the same
3170 // scheduling class. IE. an homogenous process.
3171 // + Must be root or in IA group to change change "interactive" attribute.
3172 // Priocntl() will fail silently. The only indication of failure is when
3173 // we read-back the value and notice that it hasn't changed.
3174 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3175 // + For RT, change timeslice as well. Invariant:
3176 // constant "priority integral"
3177 // Konst == TimeSlice * (60-Priority)
3178 // Given a priority, compute appropriate timeslice.
3179 // + Higher numerical values have higher priority.
3180
3181 // sched class attributes
3182 typedef struct {
3183 int schedPolicy; // classID
3184 int maxPrio;
3185 int minPrio;
3186 } SchedInfo;
3187
3188
3189 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3190
3191 #ifdef ASSERT
3192 static int ReadBackValidate = 1;
3193 #endif
3194 static int myClass = 0;
3195 static int myMin = 0;
3196 static int myMax = 0;
3197 static int myCur = 0;
3198 static bool priocntl_enable = false;
3199
3200 static const int criticalPrio = FXCriticalPriority;
3201 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3202
3203
3204 // lwp_priocntl_init
3205 //
3206 // Try to determine the priority scale for our process.
3207 //
3208 // Return errno or 0 if OK.
3209 //
3210 static int lwp_priocntl_init() {
3211 int rslt;
3212 pcinfo_t ClassInfo;
3213 pcparms_t ParmInfo;
3214 int i;
3215
3216 if (!UseThreadPriorities) return 0;
3217
3218 // If ThreadPriorityPolicy is 1, switch tables
3219 if (ThreadPriorityPolicy == 1) {
3220 for (i = 0; i < CriticalPriority+1; i++)
3221 os::java_to_os_priority[i] = prio_policy1[i];
3222 }
3223 if (UseCriticalJavaThreadPriority) {
3224 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3225 // See set_native_priority() and set_lwp_class_and_priority().
3226 // Save original MaxPriority mapping in case attempt to
3227 // use critical priority fails.
3228 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3229 // Set negative to distinguish from other priorities
3230 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3231 }
3232
3233 // Get IDs for a set of well-known scheduling classes.
3234 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3235 // the system. We should have a loop that iterates over the
3236 // classID values, which are known to be "small" integers.
3237
3238 strcpy(ClassInfo.pc_clname, "TS");
3239 ClassInfo.pc_cid = -1;
3240 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3241 if (rslt < 0) return errno;
3242 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3243 tsLimits.schedPolicy = ClassInfo.pc_cid;
3244 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3245 tsLimits.minPrio = -tsLimits.maxPrio;
3246
3247 strcpy(ClassInfo.pc_clname, "IA");
3248 ClassInfo.pc_cid = -1;
3249 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3250 if (rslt < 0) return errno;
3251 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3252 iaLimits.schedPolicy = ClassInfo.pc_cid;
3253 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3254 iaLimits.minPrio = -iaLimits.maxPrio;
3255
3256 strcpy(ClassInfo.pc_clname, "RT");
3257 ClassInfo.pc_cid = -1;
3258 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3259 if (rslt < 0) return errno;
3260 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3261 rtLimits.schedPolicy = ClassInfo.pc_cid;
3262 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3263 rtLimits.minPrio = 0;
3264
3265 strcpy(ClassInfo.pc_clname, "FX");
3266 ClassInfo.pc_cid = -1;
3267 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3268 if (rslt < 0) return errno;
3269 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3270 fxLimits.schedPolicy = ClassInfo.pc_cid;
3271 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3272 fxLimits.minPrio = 0;
3273
3274 // Query our "current" scheduling class.
3275 // This will normally be IA, TS or, rarely, FX or RT.
3276 memset(&ParmInfo, 0, sizeof(ParmInfo));
3277 ParmInfo.pc_cid = PC_CLNULL;
3278 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3279 if (rslt < 0) return errno;
3280 myClass = ParmInfo.pc_cid;
3281
3282 // We now know our scheduling classId, get specific information
3283 // about the class.
3284 ClassInfo.pc_cid = myClass;
3285 ClassInfo.pc_clname[0] = 0;
3286 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3287 if (rslt < 0) return errno;
3288
3289 if (ThreadPriorityVerbose) {
3290 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3291 }
3292
3293 memset(&ParmInfo, 0, sizeof(pcparms_t));
3294 ParmInfo.pc_cid = PC_CLNULL;
3295 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3296 if (rslt < 0) return errno;
3297
3298 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3299 myMin = rtLimits.minPrio;
3300 myMax = rtLimits.maxPrio;
3301 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3302 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3303 myMin = iaLimits.minPrio;
3304 myMax = iaLimits.maxPrio;
3305 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3306 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3307 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3308 myMin = tsLimits.minPrio;
3309 myMax = tsLimits.maxPrio;
3310 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3311 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3312 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3313 myMin = fxLimits.minPrio;
3314 myMax = fxLimits.maxPrio;
3315 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3316 } else {
3317 // No clue - punt
3318 if (ThreadPriorityVerbose) {
3319 tty->print_cr("Unknown scheduling class: %s ... \n",
3320 ClassInfo.pc_clname);
3321 }
3322 return EINVAL; // no clue, punt
3323 }
3324
3325 if (ThreadPriorityVerbose) {
3326 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3327 }
3328
3329 priocntl_enable = true; // Enable changing priorities
3330 return 0;
3331 }
3332
3333 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3334 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3335 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3336 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3337
3338
3339 // scale_to_lwp_priority
3340 //
3341 // Convert from the libthread "thr_setprio" scale to our current
3342 // lwp scheduling class scale.
3343 //
3344 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3345 int v;
3346
3347 if (x == 127) return rMax; // avoid round-down
3348 v = (((x*(rMax-rMin)))/128)+rMin;
3349 return v;
3350 }
3351
3352
3353 // set_lwp_class_and_priority
3354 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3355 int newPrio, int new_class, bool scale) {
3356 int rslt;
3357 int Actual, Expected, prv;
3358 pcparms_t ParmInfo; // for GET-SET
3359 #ifdef ASSERT
3360 pcparms_t ReadBack; // for readback
3361 #endif
3362
3363 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3364 // Query current values.
3365 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3366 // Cache "pcparms_t" in global ParmCache.
3367 // TODO: elide set-to-same-value
3368
3369 // If something went wrong on init, don't change priorities.
3370 if (!priocntl_enable) {
3371 if (ThreadPriorityVerbose) {
3372 tty->print_cr("Trying to set priority but init failed, ignoring");
3373 }
3374 return EINVAL;
3375 }
3376
3377 // If lwp hasn't started yet, just return
3378 // the _start routine will call us again.
3379 if (lwpid <= 0) {
3380 if (ThreadPriorityVerbose) {
3381 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3382 INTPTR_FORMAT " to %d, lwpid not set",
3383 ThreadID, newPrio);
3384 }
3385 return 0;
3386 }
3387
3388 if (ThreadPriorityVerbose) {
3389 tty->print_cr ("set_lwp_class_and_priority("
3390 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3391 ThreadID, lwpid, newPrio);
3392 }
3393
3394 memset(&ParmInfo, 0, sizeof(pcparms_t));
3395 ParmInfo.pc_cid = PC_CLNULL;
3396 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3397 if (rslt < 0) return errno;
3398
3399 int cur_class = ParmInfo.pc_cid;
3400 ParmInfo.pc_cid = (id_t)new_class;
3401
3402 if (new_class == rtLimits.schedPolicy) {
3403 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3404 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3405 rtLimits.maxPrio, newPrio)
3406 : newPrio;
3407 rtInfo->rt_tqsecs = RT_NOCHANGE;
3408 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3409 if (ThreadPriorityVerbose) {
3410 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3411 }
3412 } else if (new_class == iaLimits.schedPolicy) {
3413 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3414 int maxClamped = MIN2(iaLimits.maxPrio,
3415 cur_class == new_class
3416 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3417 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3418 maxClamped, newPrio)
3419 : newPrio;
3420 iaInfo->ia_uprilim = cur_class == new_class
3421 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3422 iaInfo->ia_mode = IA_NOCHANGE;
3423 if (ThreadPriorityVerbose) {
3424 tty->print_cr("IA: [%d...%d] %d->%d\n",
3425 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3426 }
3427 } else if (new_class == tsLimits.schedPolicy) {
3428 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3429 int maxClamped = MIN2(tsLimits.maxPrio,
3430 cur_class == new_class
3431 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3432 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3433 maxClamped, newPrio)
3434 : newPrio;
3435 tsInfo->ts_uprilim = cur_class == new_class
3436 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3437 if (ThreadPriorityVerbose) {
3438 tty->print_cr("TS: [%d...%d] %d->%d\n",
3439 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3440 }
3441 } else if (new_class == fxLimits.schedPolicy) {
3442 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3443 int maxClamped = MIN2(fxLimits.maxPrio,
3444 cur_class == new_class
3445 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3446 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3447 maxClamped, newPrio)
3448 : newPrio;
3449 fxInfo->fx_uprilim = cur_class == new_class
3450 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3451 fxInfo->fx_tqsecs = FX_NOCHANGE;
3452 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3453 if (ThreadPriorityVerbose) {
3454 tty->print_cr("FX: [%d...%d] %d->%d\n",
3455 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3456 }
3457 } else {
3458 if (ThreadPriorityVerbose) {
3459 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3460 }
3461 return EINVAL; // no clue, punt
3462 }
3463
3464 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3465 if (ThreadPriorityVerbose && rslt) {
3466 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3467 }
3468 if (rslt < 0) return errno;
3469
3470 #ifdef ASSERT
3471 // Sanity check: read back what we just attempted to set.
3472 // In theory it could have changed in the interim ...
3473 //
3474 // The priocntl system call is tricky.
3475 // Sometimes it'll validate the priority value argument and
3476 // return EINVAL if unhappy. At other times it fails silently.
3477 // Readbacks are prudent.
3478
3479 if (!ReadBackValidate) return 0;
3480
3481 memset(&ReadBack, 0, sizeof(pcparms_t));
3482 ReadBack.pc_cid = PC_CLNULL;
3483 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3484 assert(rslt >= 0, "priocntl failed");
3485 Actual = Expected = 0xBAD;
3486 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3487 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3488 Actual = RTPRI(ReadBack)->rt_pri;
3489 Expected = RTPRI(ParmInfo)->rt_pri;
3490 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3491 Actual = IAPRI(ReadBack)->ia_upri;
3492 Expected = IAPRI(ParmInfo)->ia_upri;
3493 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3494 Actual = TSPRI(ReadBack)->ts_upri;
3495 Expected = TSPRI(ParmInfo)->ts_upri;
3496 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3497 Actual = FXPRI(ReadBack)->fx_upri;
3498 Expected = FXPRI(ParmInfo)->fx_upri;
3499 } else {
3500 if (ThreadPriorityVerbose) {
3501 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3502 ParmInfo.pc_cid);
3503 }
3504 }
3505
3506 if (Actual != Expected) {
3507 if (ThreadPriorityVerbose) {
3508 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3509 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3510 }
3511 }
3512 #endif
3513
3514 return 0;
3515 }
3516
3517 // Solaris only gives access to 128 real priorities at a time,
3518 // so we expand Java's ten to fill this range. This would be better
3519 // if we dynamically adjusted relative priorities.
3520 //
3521 // The ThreadPriorityPolicy option allows us to select 2 different
3522 // priority scales.
3523 //
3524 // ThreadPriorityPolicy=0
3525 // Since the Solaris' default priority is MaximumPriority, we do not
3526 // set a priority lower than Max unless a priority lower than
3527 // NormPriority is requested.
3528 //
3529 // ThreadPriorityPolicy=1
3530 // This mode causes the priority table to get filled with
3531 // linear values. NormPriority get's mapped to 50% of the
3532 // Maximum priority an so on. This will cause VM threads
3533 // to get unfair treatment against other Solaris processes
3534 // which do not explicitly alter their thread priorities.
3535
3536 int os::java_to_os_priority[CriticalPriority + 1] = {
3537 -99999, // 0 Entry should never be used
3538
3539 0, // 1 MinPriority
3540 32, // 2
3541 64, // 3
3542
3543 96, // 4
3544 127, // 5 NormPriority
3545 127, // 6
3546
3547 127, // 7
3548 127, // 8
3549 127, // 9 NearMaxPriority
3550
3551 127, // 10 MaxPriority
3552
3553 -criticalPrio // 11 CriticalPriority
3554 };
3555
3556 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3557 OSThread* osthread = thread->osthread();
3558
3559 // Save requested priority in case the thread hasn't been started
3560 osthread->set_native_priority(newpri);
3561
3562 // Check for critical priority request
3563 bool fxcritical = false;
3564 if (newpri == -criticalPrio) {
3565 fxcritical = true;
3566 newpri = criticalPrio;
3567 }
3568
3569 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3570 if (!UseThreadPriorities) return OS_OK;
3571
3572 int status = 0;
3573
3574 if (!fxcritical) {
3575 // Use thr_setprio only if we have a priority that thr_setprio understands
3576 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3577 }
3578
3579 int lwp_status =
3580 set_lwp_class_and_priority(osthread->thread_id(),
3581 osthread->lwp_id(),
3582 newpri,
3583 fxcritical ? fxLimits.schedPolicy : myClass,
3584 !fxcritical);
3585 if (lwp_status != 0 && fxcritical) {
3586 // Try again, this time without changing the scheduling class
3587 newpri = java_MaxPriority_to_os_priority;
3588 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3589 osthread->lwp_id(),
3590 newpri, myClass, false);
3591 }
3592 status |= lwp_status;
3593 return (status == 0) ? OS_OK : OS_ERR;
3594 }
3595
3596
3597 OSReturn os::get_native_priority(const Thread* const thread,
3598 int *priority_ptr) {
3599 int p;
3600 if (!UseThreadPriorities) {
3601 *priority_ptr = NormalPriority;
3602 return OS_OK;
3603 }
3604 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3605 if (status != 0) {
3606 return OS_ERR;
3607 }
3608 *priority_ptr = p;
3609 return OS_OK;
3610 }
3611
3612
3613 // Hint to the underlying OS that a task switch would not be good.
3614 // Void return because it's a hint and can fail.
3615 void os::hint_no_preempt() {
3616 schedctl_start(schedctl_init());
3617 }
3618
3619 static void resume_clear_context(OSThread *osthread) {
3620 osthread->set_ucontext(NULL);
3621 }
3622
3623 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3624 osthread->set_ucontext(context);
3625 }
3626
3627 static PosixSemaphore sr_semaphore;
3628
3629 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3630 // Save and restore errno to avoid confusing native code with EINTR
3631 // after sigsuspend.
3632 int old_errno = errno;
3633
3634 OSThread* osthread = thread->osthread();
3635 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3636
3637 os::SuspendResume::State current = osthread->sr.state();
3638 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3639 suspend_save_context(osthread, uc);
3640
3641 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3642 os::SuspendResume::State state = osthread->sr.suspended();
3643 if (state == os::SuspendResume::SR_SUSPENDED) {
3644 sigset_t suspend_set; // signals for sigsuspend()
3645
3646 // get current set of blocked signals and unblock resume signal
3647 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3648 sigdelset(&suspend_set, os::Solaris::SIGasync());
3649
3650 sr_semaphore.signal();
3651 // wait here until we are resumed
3652 while (1) {
3653 sigsuspend(&suspend_set);
3654
3655 os::SuspendResume::State result = osthread->sr.running();
3656 if (result == os::SuspendResume::SR_RUNNING) {
3657 sr_semaphore.signal();
3658 break;
3659 }
3660 }
3661
3662 } else if (state == os::SuspendResume::SR_RUNNING) {
3663 // request was cancelled, continue
3664 } else {
3665 ShouldNotReachHere();
3666 }
3667
3668 resume_clear_context(osthread);
3669 } else if (current == os::SuspendResume::SR_RUNNING) {
3670 // request was cancelled, continue
3671 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3672 // ignore
3673 } else {
3674 // ignore
3675 }
3676
3677 errno = old_errno;
3678 }
3679
3680 void os::print_statistics() {
3681 }
3682
3683 bool os::message_box(const char* title, const char* message) {
3684 int i;
3685 fdStream err(defaultStream::error_fd());
3686 for (i = 0; i < 78; i++) err.print_raw("=");
3687 err.cr();
3688 err.print_raw_cr(title);
3689 for (i = 0; i < 78; i++) err.print_raw("-");
3690 err.cr();
3691 err.print_raw_cr(message);
3692 for (i = 0; i < 78; i++) err.print_raw("=");
3693 err.cr();
3694
3695 char buf[16];
3696 // Prevent process from exiting upon "read error" without consuming all CPU
3697 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3698
3699 return buf[0] == 'y' || buf[0] == 'Y';
3700 }
3701
3702 static int sr_notify(OSThread* osthread) {
3703 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3704 assert_status(status == 0, status, "thr_kill");
3705 return status;
3706 }
3707
3708 // "Randomly" selected value for how long we want to spin
3709 // before bailing out on suspending a thread, also how often
3710 // we send a signal to a thread we want to resume
3711 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3712 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3713
3714 static bool do_suspend(OSThread* osthread) {
3715 assert(osthread->sr.is_running(), "thread should be running");
3716 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3717
3718 // mark as suspended and send signal
3719 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3720 // failed to switch, state wasn't running?
3721 ShouldNotReachHere();
3722 return false;
3723 }
3724
3725 if (sr_notify(osthread) != 0) {
3726 ShouldNotReachHere();
3727 }
3728
3729 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3730 while (true) {
3731 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3732 break;
3733 } else {
3734 // timeout
3735 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3736 if (cancelled == os::SuspendResume::SR_RUNNING) {
3737 return false;
3738 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3739 // make sure that we consume the signal on the semaphore as well
3740 sr_semaphore.wait();
3741 break;
3742 } else {
3743 ShouldNotReachHere();
3744 return false;
3745 }
3746 }
3747 }
3748
3749 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3750 return true;
3751 }
3752
3753 static void do_resume(OSThread* osthread) {
3754 assert(osthread->sr.is_suspended(), "thread should be suspended");
3755 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3756
3757 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3758 // failed to switch to WAKEUP_REQUEST
3759 ShouldNotReachHere();
3760 return;
3761 }
3762
3763 while (true) {
3764 if (sr_notify(osthread) == 0) {
3765 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3766 if (osthread->sr.is_running()) {
3767 return;
3768 }
3769 }
3770 } else {
3771 ShouldNotReachHere();
3772 }
3773 }
3774
3775 guarantee(osthread->sr.is_running(), "Must be running!");
3776 }
3777
3778 void os::SuspendedThreadTask::internal_do_task() {
3779 if (do_suspend(_thread->osthread())) {
3780 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3781 do_task(context);
3782 do_resume(_thread->osthread());
3783 }
3784 }
3785
3786 class PcFetcher : public os::SuspendedThreadTask {
3787 public:
3788 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3789 ExtendedPC result();
3790 protected:
3791 void do_task(const os::SuspendedThreadTaskContext& context);
3792 private:
3793 ExtendedPC _epc;
3794 };
3795
3796 ExtendedPC PcFetcher::result() {
3797 guarantee(is_done(), "task is not done yet.");
3798 return _epc;
3799 }
3800
3801 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3802 Thread* thread = context.thread();
3803 OSThread* osthread = thread->osthread();
3804 if (osthread->ucontext() != NULL) {
3805 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext());
3806 } else {
3807 // NULL context is unexpected, double-check this is the VMThread
3808 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3809 }
3810 }
3811
3812 // A lightweight implementation that does not suspend the target thread and
3813 // thus returns only a hint. Used for profiling only!
3814 ExtendedPC os::get_thread_pc(Thread* thread) {
3815 // Make sure that it is called by the watcher and the Threads lock is owned.
3816 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3817 // For now, is only used to profile the VM Thread
3818 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3819 PcFetcher fetcher(thread);
3820 fetcher.run();
3821 return fetcher.result();
3822 }
3823
3824
3825 // This does not do anything on Solaris. This is basically a hook for being
3826 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3827 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3828 const methodHandle& method, JavaCallArguments* args,
3829 Thread* thread) {
3830 f(value, method, args, thread);
3831 }
3832
3833 // This routine may be used by user applications as a "hook" to catch signals.
3834 // The user-defined signal handler must pass unrecognized signals to this
3835 // routine, and if it returns true (non-zero), then the signal handler must
3836 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3837 // routine will never retun false (zero), but instead will execute a VM panic
3838 // routine kill the process.
3839 //
3840 // If this routine returns false, it is OK to call it again. This allows
3841 // the user-defined signal handler to perform checks either before or after
3842 // the VM performs its own checks. Naturally, the user code would be making
3843 // a serious error if it tried to handle an exception (such as a null check
3844 // or breakpoint) that the VM was generating for its own correct operation.
3845 //
3846 // This routine may recognize any of the following kinds of signals:
3847 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3848 // os::Solaris::SIGasync
3849 // It should be consulted by handlers for any of those signals.
3850 //
3851 // The caller of this routine must pass in the three arguments supplied
3852 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3853 // field of the structure passed to sigaction(). This routine assumes that
3854 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3855 //
3856 // Note that the VM will print warnings if it detects conflicting signal
3857 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3858 //
3859 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3860 siginfo_t* siginfo,
3861 void* ucontext,
3862 int abort_if_unrecognized);
3863
3864
3865 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3866 int orig_errno = errno; // Preserve errno value over signal handler.
3867 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3868 errno = orig_errno;
3869 }
3870
3871 // This boolean allows users to forward their own non-matching signals
3872 // to JVM_handle_solaris_signal, harmlessly.
3873 bool os::Solaris::signal_handlers_are_installed = false;
3874
3875 // For signal-chaining
3876 bool os::Solaris::libjsig_is_loaded = false;
3877 typedef struct sigaction *(*get_signal_t)(int);
3878 get_signal_t os::Solaris::get_signal_action = NULL;
3879
3880 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3881 struct sigaction *actp = NULL;
3882
3883 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3884 // Retrieve the old signal handler from libjsig
3885 actp = (*get_signal_action)(sig);
3886 }
3887 if (actp == NULL) {
3888 // Retrieve the preinstalled signal handler from jvm
3889 actp = get_preinstalled_handler(sig);
3890 }
3891
3892 return actp;
3893 }
3894
3895 static bool call_chained_handler(struct sigaction *actp, int sig,
3896 siginfo_t *siginfo, void *context) {
3897 // Call the old signal handler
3898 if (actp->sa_handler == SIG_DFL) {
3899 // It's more reasonable to let jvm treat it as an unexpected exception
3900 // instead of taking the default action.
3901 return false;
3902 } else if (actp->sa_handler != SIG_IGN) {
3903 if ((actp->sa_flags & SA_NODEFER) == 0) {
3904 // automaticlly block the signal
3905 sigaddset(&(actp->sa_mask), sig);
3906 }
3907
3908 sa_handler_t hand;
3909 sa_sigaction_t sa;
3910 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3911 // retrieve the chained handler
3912 if (siginfo_flag_set) {
3913 sa = actp->sa_sigaction;
3914 } else {
3915 hand = actp->sa_handler;
3916 }
3917
3918 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3919 actp->sa_handler = SIG_DFL;
3920 }
3921
3922 // try to honor the signal mask
3923 sigset_t oset;
3924 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3925
3926 // call into the chained handler
3927 if (siginfo_flag_set) {
3928 (*sa)(sig, siginfo, context);
3929 } else {
3930 (*hand)(sig);
3931 }
3932
3933 // restore the signal mask
3934 pthread_sigmask(SIG_SETMASK, &oset, 0);
3935 }
3936 // Tell jvm's signal handler the signal is taken care of.
3937 return true;
3938 }
3939
3940 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3941 bool chained = false;
3942 // signal-chaining
3943 if (UseSignalChaining) {
3944 struct sigaction *actp = get_chained_signal_action(sig);
3945 if (actp != NULL) {
3946 chained = call_chained_handler(actp, sig, siginfo, context);
3947 }
3948 }
3949 return chained;
3950 }
3951
3952 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3953 assert((chainedsigactions != (struct sigaction *)NULL) &&
3954 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3955 if (preinstalled_sigs[sig] != 0) {
3956 return &chainedsigactions[sig];
3957 }
3958 return NULL;
3959 }
3960
3961 void os::Solaris::save_preinstalled_handler(int sig,
3962 struct sigaction& oldAct) {
3963 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3964 assert((chainedsigactions != (struct sigaction *)NULL) &&
3965 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3966 chainedsigactions[sig] = oldAct;
3967 preinstalled_sigs[sig] = 1;
3968 }
3969
3970 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3971 bool oktochain) {
3972 // Check for overwrite.
3973 struct sigaction oldAct;
3974 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3975 void* oldhand =
3976 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3977 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3978 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3979 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3980 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3981 if (AllowUserSignalHandlers || !set_installed) {
3982 // Do not overwrite; user takes responsibility to forward to us.
3983 return;
3984 } else if (UseSignalChaining) {
3985 if (oktochain) {
3986 // save the old handler in jvm
3987 save_preinstalled_handler(sig, oldAct);
3988 } else {
3989 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3990 }
3991 // libjsig also interposes the sigaction() call below and saves the
3992 // old sigaction on it own.
3993 } else {
3994 fatal("Encountered unexpected pre-existing sigaction handler "
3995 "%#lx for signal %d.", (long)oldhand, sig);
3996 }
3997 }
3998
3999 struct sigaction sigAct;
4000 sigfillset(&(sigAct.sa_mask));
4001 sigAct.sa_handler = SIG_DFL;
4002
4003 sigAct.sa_sigaction = signalHandler;
4004 // Handle SIGSEGV on alternate signal stack if
4005 // not using stack banging
4006 if (!UseStackBanging && sig == SIGSEGV) {
4007 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
4008 } else {
4009 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
4010 }
4011 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4012
4013 sigaction(sig, &sigAct, &oldAct);
4014
4015 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4016 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4017 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4018 }
4019
4020
4021 #define DO_SIGNAL_CHECK(sig) \
4022 do { \
4023 if (!sigismember(&check_signal_done, sig)) { \
4024 os::Solaris::check_signal_handler(sig); \
4025 } \
4026 } while (0)
4027
4028 // This method is a periodic task to check for misbehaving JNI applications
4029 // under CheckJNI, we can add any periodic checks here
4030
4031 void os::run_periodic_checks() {
4032 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4033 // thereby preventing a NULL checks.
4034 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
4035
4036 if (check_signals == false) return;
4037
4038 // SEGV and BUS if overridden could potentially prevent
4039 // generation of hs*.log in the event of a crash, debugging
4040 // such a case can be very challenging, so we absolutely
4041 // check for the following for a good measure:
4042 DO_SIGNAL_CHECK(SIGSEGV);
4043 DO_SIGNAL_CHECK(SIGILL);
4044 DO_SIGNAL_CHECK(SIGFPE);
4045 DO_SIGNAL_CHECK(SIGBUS);
4046 DO_SIGNAL_CHECK(SIGPIPE);
4047 DO_SIGNAL_CHECK(SIGXFSZ);
4048
4049 // ReduceSignalUsage allows the user to override these handlers
4050 // see comments at the very top and jvm_solaris.h
4051 if (!ReduceSignalUsage) {
4052 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4053 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4054 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4055 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4056 }
4057
4058 // See comments above for using JVM1/JVM2
4059 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4060
4061 }
4062
4063 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4064
4065 static os_sigaction_t os_sigaction = NULL;
4066
4067 void os::Solaris::check_signal_handler(int sig) {
4068 char buf[O_BUFLEN];
4069 address jvmHandler = NULL;
4070
4071 struct sigaction act;
4072 if (os_sigaction == NULL) {
4073 // only trust the default sigaction, in case it has been interposed
4074 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4075 if (os_sigaction == NULL) return;
4076 }
4077
4078 os_sigaction(sig, (struct sigaction*)NULL, &act);
4079
4080 address thisHandler = (act.sa_flags & SA_SIGINFO)
4081 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4082 : CAST_FROM_FN_PTR(address, act.sa_handler);
4083
4084
4085 switch (sig) {
4086 case SIGSEGV:
4087 case SIGBUS:
4088 case SIGFPE:
4089 case SIGPIPE:
4090 case SIGXFSZ:
4091 case SIGILL:
4092 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4093 break;
4094
4095 case SHUTDOWN1_SIGNAL:
4096 case SHUTDOWN2_SIGNAL:
4097 case SHUTDOWN3_SIGNAL:
4098 case BREAK_SIGNAL:
4099 jvmHandler = (address)user_handler();
4100 break;
4101
4102 default:
4103 int asynsig = os::Solaris::SIGasync();
4104
4105 if (sig == asynsig) {
4106 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4107 } else {
4108 return;
4109 }
4110 break;
4111 }
4112
4113
4114 if (thisHandler != jvmHandler) {
4115 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4116 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4117 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4118 // No need to check this sig any longer
4119 sigaddset(&check_signal_done, sig);
4120 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4121 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4122 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4123 exception_name(sig, buf, O_BUFLEN));
4124 }
4125 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4126 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4127 tty->print("expected:");
4128 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
4129 tty->cr();
4130 tty->print(" found:");
4131 os::Posix::print_sa_flags(tty, act.sa_flags);
4132 tty->cr();
4133 // No need to check this sig any longer
4134 sigaddset(&check_signal_done, sig);
4135 }
4136
4137 // Print all the signal handler state
4138 if (sigismember(&check_signal_done, sig)) {
4139 print_signal_handlers(tty, buf, O_BUFLEN);
4140 }
4141
4142 }
4143
4144 void os::Solaris::install_signal_handlers() {
4145 bool libjsigdone = false;
4146 signal_handlers_are_installed = true;
4147
4148 // signal-chaining
4149 typedef void (*signal_setting_t)();
4150 signal_setting_t begin_signal_setting = NULL;
4151 signal_setting_t end_signal_setting = NULL;
4152 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4153 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4154 if (begin_signal_setting != NULL) {
4155 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4156 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4157 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4158 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4159 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4160 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4161 libjsig_is_loaded = true;
4162 if (os::Solaris::get_libjsig_version != NULL) {
4163 libjsigversion = (*os::Solaris::get_libjsig_version)();
4164 }
4165 assert(UseSignalChaining, "should enable signal-chaining");
4166 }
4167 if (libjsig_is_loaded) {
4168 // Tell libjsig jvm is setting signal handlers
4169 (*begin_signal_setting)();
4170 }
4171
4172 set_signal_handler(SIGSEGV, true, true);
4173 set_signal_handler(SIGPIPE, true, true);
4174 set_signal_handler(SIGXFSZ, true, true);
4175 set_signal_handler(SIGBUS, true, true);
4176 set_signal_handler(SIGILL, true, true);
4177 set_signal_handler(SIGFPE, true, true);
4178
4179
4180 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4181 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4182 // can not register overridable signals which might be > 32
4183 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4184 // Tell libjsig jvm has finished setting signal handlers
4185 (*end_signal_setting)();
4186 libjsigdone = true;
4187 }
4188 }
4189
4190 set_signal_handler(os::Solaris::SIGasync(), true, true);
4191
4192 if (libjsig_is_loaded && !libjsigdone) {
4193 // Tell libjsig jvm finishes setting signal handlers
4194 (*end_signal_setting)();
4195 }
4196
4197 // We don't activate signal checker if libjsig is in place, we trust ourselves
4198 // and if UserSignalHandler is installed all bets are off.
4199 // Log that signal checking is off only if -verbose:jni is specified.
4200 if (CheckJNICalls) {
4201 if (libjsig_is_loaded) {
4202 if (PrintJNIResolving) {
4203 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4204 }
4205 check_signals = false;
4206 }
4207 if (AllowUserSignalHandlers) {
4208 if (PrintJNIResolving) {
4209 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4210 }
4211 check_signals = false;
4212 }
4213 }
4214 }
4215
4216
4217 void report_error(const char* file_name, int line_no, const char* title,
4218 const char* format, ...);
4219
4220 // (Static) wrapper for getisax(2) call.
4221 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4222
4223 // (Static) wrappers for the liblgrp API
4224 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4225 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4226 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4227 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4228 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4229 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4230 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4231 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4232 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4233
4234 // (Static) wrapper for meminfo() call.
4235 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4236
4237 static address resolve_symbol_lazy(const char* name) {
4238 address addr = (address) dlsym(RTLD_DEFAULT, name);
4239 if (addr == NULL) {
4240 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4241 addr = (address) dlsym(RTLD_NEXT, name);
4242 }
4243 return addr;
4244 }
4245
4246 static address resolve_symbol(const char* name) {
4247 address addr = resolve_symbol_lazy(name);
4248 if (addr == NULL) {
4249 fatal(dlerror());
4250 }
4251 return addr;
4252 }
4253
4254 void os::Solaris::libthread_init() {
4255 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4256
4257 lwp_priocntl_init();
4258
4259 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4260 if (func == NULL) {
4261 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4262 // Guarantee that this VM is running on an new enough OS (5.6 or
4263 // later) that it will have a new enough libthread.so.
4264 guarantee(func != NULL, "libthread.so is too old.");
4265 }
4266
4267 int size;
4268 void (*handler_info_func)(address *, int *);
4269 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4270 handler_info_func(&handler_start, &size);
4271 handler_end = handler_start + size;
4272 }
4273
4274
4275 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4276 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4277 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4278 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4279 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4280 int os::Solaris::_mutex_scope = USYNC_THREAD;
4281
4282 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4283 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4284 int_fnP_cond_tP os::Solaris::_cond_signal;
4285 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4286 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4287 int_fnP_cond_tP os::Solaris::_cond_destroy;
4288 int os::Solaris::_cond_scope = USYNC_THREAD;
4289
4290 void os::Solaris::synchronization_init() {
4291 if (UseLWPSynchronization) {
4292 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4293 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4294 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4295 os::Solaris::set_mutex_init(lwp_mutex_init);
4296 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4297 os::Solaris::set_mutex_scope(USYNC_THREAD);
4298
4299 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4300 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4301 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4302 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4303 os::Solaris::set_cond_init(lwp_cond_init);
4304 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4305 os::Solaris::set_cond_scope(USYNC_THREAD);
4306 } else {
4307 os::Solaris::set_mutex_scope(USYNC_THREAD);
4308 os::Solaris::set_cond_scope(USYNC_THREAD);
4309
4310 if (UsePthreads) {
4311 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4312 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4313 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4314 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4315 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4316
4317 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4318 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4319 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4320 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4321 os::Solaris::set_cond_init(pthread_cond_default_init);
4322 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4323 } else {
4324 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4325 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4326 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4327 os::Solaris::set_mutex_init(::mutex_init);
4328 os::Solaris::set_mutex_destroy(::mutex_destroy);
4329
4330 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4331 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4332 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4333 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4334 os::Solaris::set_cond_init(::cond_init);
4335 os::Solaris::set_cond_destroy(::cond_destroy);
4336 }
4337 }
4338 }
4339
4340 bool os::Solaris::liblgrp_init() {
4341 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4342 if (handle != NULL) {
4343 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4344 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4345 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4346 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4347 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4348 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4349 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4350 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4351 dlsym(handle, "lgrp_cookie_stale")));
4352
4353 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4354 set_lgrp_cookie(c);
4355 return true;
4356 }
4357 return false;
4358 }
4359
4360 void os::Solaris::misc_sym_init() {
4361 address func;
4362
4363 // getisax
4364 func = resolve_symbol_lazy("getisax");
4365 if (func != NULL) {
4366 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4367 }
4368
4369 // meminfo
4370 func = resolve_symbol_lazy("meminfo");
4371 if (func != NULL) {
4372 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4373 }
4374 }
4375
4376 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4377 assert(_getisax != NULL, "_getisax not set");
4378 return _getisax(array, n);
4379 }
4380
4381 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4382 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4383 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4384
4385 void init_pset_getloadavg_ptr(void) {
4386 pset_getloadavg_ptr =
4387 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4388 if (pset_getloadavg_ptr == NULL) {
4389 log_warning(os)("pset_getloadavg function not found");
4390 }
4391 }
4392
4393 int os::Solaris::_dev_zero_fd = -1;
4394
4395 // this is called _before_ the global arguments have been parsed
4396 void os::init(void) {
4397 _initial_pid = getpid();
4398
4399 max_hrtime = first_hrtime = gethrtime();
4400
4401 init_random(1234567);
4402
4403 page_size = sysconf(_SC_PAGESIZE);
4404 if (page_size == -1) {
4405 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4406 }
4407 init_page_sizes((size_t) page_size);
4408
4409 Solaris::initialize_system_info();
4410
4411 // Initialize misc. symbols as soon as possible, so we can use them
4412 // if we need them.
4413 Solaris::misc_sym_init();
4414
4415 int fd = ::open("/dev/zero", O_RDWR);
4416 if (fd < 0) {
4417 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4418 } else {
4419 Solaris::set_dev_zero_fd(fd);
4420
4421 // Close on exec, child won't inherit.
4422 fcntl(fd, F_SETFD, FD_CLOEXEC);
4423 }
4424
4425 clock_tics_per_sec = CLK_TCK;
4426
4427 // check if dladdr1() exists; dladdr1 can provide more information than
4428 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4429 // and is available on linker patches for 5.7 and 5.8.
4430 // libdl.so must have been loaded, this call is just an entry lookup
4431 void * hdl = dlopen("libdl.so", RTLD_NOW);
4432 if (hdl) {
4433 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4434 }
4435
4436 // (Solaris only) this switches to calls that actually do locking.
4437 ThreadCritical::initialize();
4438
4439 main_thread = thr_self();
4440
4441 // Constant minimum stack size allowed. It must be at least
4442 // the minimum of what the OS supports (thr_min_stack()), and
4443 // enough to allow the thread to get to user bytecode execution.
4444 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4445
4446 // dynamic lookup of functions that may not be available in our lowest
4447 // supported Solaris release
4448 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4449 if (handle != NULL) {
4450 Solaris::_pthread_setname_np = // from 11.3
4451 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4452
4453 _get_nsec_fromepoch = // from 11.3.6
4454 (_get_nsec_fromepoch_func_t) dlsym(handle, "get_nsec_fromepoch");
4455 }
4456 }
4457
4458 // To install functions for atexit system call
4459 extern "C" {
4460 static void perfMemory_exit_helper() {
4461 perfMemory_exit();
4462 }
4463 }
4464
4465 // this is called _after_ the global arguments have been parsed
4466 jint os::init_2(void) {
4467 // try to enable extended file IO ASAP, see 6431278
4468 os::Solaris::try_enable_extended_io();
4469
4470 // Allocate a single page and mark it as readable for safepoint polling. Also
4471 // use this first mmap call to check support for MAP_ALIGN.
4472 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4473 page_size,
4474 MAP_PRIVATE | MAP_ALIGN,
4475 PROT_READ);
4476 if (polling_page == NULL) {
4477 has_map_align = false;
4478 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4479 PROT_READ);
4480 }
4481
4482 os::set_polling_page(polling_page);
4483 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4484
4485 if (!UseMembar) {
4486 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4487 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4488 os::set_memory_serialize_page(mem_serialize_page);
4489 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4490 }
4491
4492 // Check minimum allowable stack size for thread creation and to initialize
4493 // the java system classes, including StackOverflowError - depends on page
4494 // size. Add a page for compiler2 recursion in main thread.
4495 // Add in 2*BytesPerWord times page size to account for VM stack during
4496 // class initialization depending on 32 or 64 bit VM.
4497 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4498 JavaThread::stack_guard_zone_size() +
4499 JavaThread::stack_shadow_zone_size() +
4500 (2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4501
4502 size_t threadStackSizeInBytes = ThreadStackSize * K;
4503 if (threadStackSizeInBytes != 0 &&
4504 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4505 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4506 os::Solaris::min_stack_allowed/K);
4507 return JNI_ERR;
4508 }
4509
4510 // For 64kbps there will be a 64kb page size, which makes
4511 // the usable default stack size quite a bit less. Increase the
4512 // stack for 64kb (or any > than 8kb) pages, this increases
4513 // virtual memory fragmentation (since we're not creating the
4514 // stack on a power of 2 boundary. The real fix for this
4515 // should be to fix the guard page mechanism.
4516
4517 if (vm_page_size() > 8*K) {
4518 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4519 ? threadStackSizeInBytes +
4520 JavaThread::stack_red_zone_size() +
4521 JavaThread::stack_yellow_zone_size()
4522 : 0;
4523 ThreadStackSize = threadStackSizeInBytes/K;
4524 }
4525
4526 // Make the stack size a multiple of the page size so that
4527 // the yellow/red zones can be guarded.
4528 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4529 vm_page_size()));
4530
4531 Solaris::libthread_init();
4532
4533 if (UseNUMA) {
4534 if (!Solaris::liblgrp_init()) {
4535 UseNUMA = false;
4536 } else {
4537 size_t lgrp_limit = os::numa_get_groups_num();
4538 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4539 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4540 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4541 if (lgrp_num < 2) {
4542 // There's only one locality group, disable NUMA.
4543 UseNUMA = false;
4544 }
4545 }
4546 if (!UseNUMA && ForceNUMA) {
4547 UseNUMA = true;
4548 }
4549 }
4550
4551 Solaris::signal_sets_init();
4552 Solaris::init_signal_mem();
4553 Solaris::install_signal_handlers();
4554
4555 if (libjsigversion < JSIG_VERSION_1_4_1) {
4556 Maxlibjsigsigs = OLDMAXSIGNUM;
4557 }
4558
4559 // initialize synchronization primitives to use either thread or
4560 // lwp synchronization (controlled by UseLWPSynchronization)
4561 Solaris::synchronization_init();
4562
4563 if (MaxFDLimit) {
4564 // set the number of file descriptors to max. print out error
4565 // if getrlimit/setrlimit fails but continue regardless.
4566 struct rlimit nbr_files;
4567 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4568 if (status != 0) {
4569 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4570 } else {
4571 nbr_files.rlim_cur = nbr_files.rlim_max;
4572 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4573 if (status != 0) {
4574 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4575 }
4576 }
4577 }
4578
4579 // Calculate theoretical max. size of Threads to guard gainst
4580 // artifical out-of-memory situations, where all available address-
4581 // space has been reserved by thread stacks. Default stack size is 1Mb.
4582 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4583 JavaThread::stack_size_at_create() : (1*K*K);
4584 assert(pre_thread_stack_size != 0, "Must have a stack");
4585 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4586 // we should start doing Virtual Memory banging. Currently when the threads will
4587 // have used all but 200Mb of space.
4588 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4589 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4590
4591 // at-exit methods are called in the reverse order of their registration.
4592 // In Solaris 7 and earlier, atexit functions are called on return from
4593 // main or as a result of a call to exit(3C). There can be only 32 of
4594 // these functions registered and atexit() does not set errno. In Solaris
4595 // 8 and later, there is no limit to the number of functions registered
4596 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4597 // functions are called upon dlclose(3DL) in addition to return from main
4598 // and exit(3C).
4599
4600 if (PerfAllowAtExitRegistration) {
4601 // only register atexit functions if PerfAllowAtExitRegistration is set.
4602 // atexit functions can be delayed until process exit time, which
4603 // can be problematic for embedded VM situations. Embedded VMs should
4604 // call DestroyJavaVM() to assure that VM resources are released.
4605
4606 // note: perfMemory_exit_helper atexit function may be removed in
4607 // the future if the appropriate cleanup code can be added to the
4608 // VM_Exit VMOperation's doit method.
4609 if (atexit(perfMemory_exit_helper) != 0) {
4610 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4611 }
4612 }
4613
4614 // Init pset_loadavg function pointer
4615 init_pset_getloadavg_ptr();
4616
4617 return JNI_OK;
4618 }
4619
4620 // Mark the polling page as unreadable
4621 void os::make_polling_page_unreadable(void) {
4622 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4623 fatal("Could not disable polling page");
4624 }
4625 }
4626
4627 // Mark the polling page as readable
4628 void os::make_polling_page_readable(void) {
4629 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4630 fatal("Could not enable polling page");
4631 }
4632 }
4633
4634 // OS interface.
4635
4636 bool os::check_heap(bool force) { return true; }
4637
4638 // Is a (classpath) directory empty?
4639 bool os::dir_is_empty(const char* path) {
4640 DIR *dir = NULL;
4641 struct dirent *ptr;
4642
4643 dir = opendir(path);
4644 if (dir == NULL) return true;
4645
4646 // Scan the directory
4647 bool result = true;
4648 char buf[sizeof(struct dirent) + MAX_PATH];
4649 struct dirent *dbuf = (struct dirent *) buf;
4650 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4651 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4652 result = false;
4653 }
4654 }
4655 closedir(dir);
4656 return result;
4657 }
4658
4659 // This code originates from JDK's sysOpen and open64_w
4660 // from src/solaris/hpi/src/system_md.c
4661
4662 int os::open(const char *path, int oflag, int mode) {
4663 if (strlen(path) > MAX_PATH - 1) {
4664 errno = ENAMETOOLONG;
4665 return -1;
4666 }
4667 int fd;
4668
4669 fd = ::open64(path, oflag, mode);
4670 if (fd == -1) return -1;
4671
4672 // If the open succeeded, the file might still be a directory
4673 {
4674 struct stat64 buf64;
4675 int ret = ::fstat64(fd, &buf64);
4676 int st_mode = buf64.st_mode;
4677
4678 if (ret != -1) {
4679 if ((st_mode & S_IFMT) == S_IFDIR) {
4680 errno = EISDIR;
4681 ::close(fd);
4682 return -1;
4683 }
4684 } else {
4685 ::close(fd);
4686 return -1;
4687 }
4688 }
4689
4690 // 32-bit Solaris systems suffer from:
4691 //
4692 // - an historical default soft limit of 256 per-process file
4693 // descriptors that is too low for many Java programs.
4694 //
4695 // - a design flaw where file descriptors created using stdio
4696 // fopen must be less than 256, _even_ when the first limit above
4697 // has been raised. This can cause calls to fopen (but not calls to
4698 // open, for example) to fail mysteriously, perhaps in 3rd party
4699 // native code (although the JDK itself uses fopen). One can hardly
4700 // criticize them for using this most standard of all functions.
4701 //
4702 // We attempt to make everything work anyways by:
4703 //
4704 // - raising the soft limit on per-process file descriptors beyond
4705 // 256
4706 //
4707 // - As of Solaris 10u4, we can request that Solaris raise the 256
4708 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4709 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4710 //
4711 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4712 // workaround the bug by remapping non-stdio file descriptors below
4713 // 256 to ones beyond 256, which is done below.
4714 //
4715 // See:
4716 // 1085341: 32-bit stdio routines should support file descriptors >255
4717 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4718 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4719 // enable_extended_FILE_stdio() in VM initialisation
4720 // Giri Mandalika's blog
4721 // http://technopark02.blogspot.com/2005_05_01_archive.html
4722 //
4723 #ifndef _LP64
4724 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4725 int newfd = ::fcntl(fd, F_DUPFD, 256);
4726 if (newfd != -1) {
4727 ::close(fd);
4728 fd = newfd;
4729 }
4730 }
4731 #endif // 32-bit Solaris
4732
4733 // All file descriptors that are opened in the JVM and not
4734 // specifically destined for a subprocess should have the
4735 // close-on-exec flag set. If we don't set it, then careless 3rd
4736 // party native code might fork and exec without closing all
4737 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4738 // UNIXProcess.c), and this in turn might:
4739 //
4740 // - cause end-of-file to fail to be detected on some file
4741 // descriptors, resulting in mysterious hangs, or
4742 //
4743 // - might cause an fopen in the subprocess to fail on a system
4744 // suffering from bug 1085341.
4745 //
4746 // (Yes, the default setting of the close-on-exec flag is a Unix
4747 // design flaw)
4748 //
4749 // See:
4750 // 1085341: 32-bit stdio routines should support file descriptors >255
4751 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4752 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4753 //
4754 #ifdef FD_CLOEXEC
4755 {
4756 int flags = ::fcntl(fd, F_GETFD);
4757 if (flags != -1) {
4758 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4759 }
4760 }
4761 #endif
4762
4763 return fd;
4764 }
4765
4766 // create binary file, rewriting existing file if required
4767 int os::create_binary_file(const char* path, bool rewrite_existing) {
4768 int oflags = O_WRONLY | O_CREAT;
4769 if (!rewrite_existing) {
4770 oflags |= O_EXCL;
4771 }
4772 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4773 }
4774
4775 // return current position of file pointer
4776 jlong os::current_file_offset(int fd) {
4777 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4778 }
4779
4780 // move file pointer to the specified offset
4781 jlong os::seek_to_file_offset(int fd, jlong offset) {
4782 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4783 }
4784
4785 jlong os::lseek(int fd, jlong offset, int whence) {
4786 return (jlong) ::lseek64(fd, offset, whence);
4787 }
4788
4789 char * os::native_path(char *path) {
4790 return path;
4791 }
4792
4793 int os::ftruncate(int fd, jlong length) {
4794 return ::ftruncate64(fd, length);
4795 }
4796
4797 int os::fsync(int fd) {
4798 RESTARTABLE_RETURN_INT(::fsync(fd));
4799 }
4800
4801 int os::available(int fd, jlong *bytes) {
4802 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4803 "Assumed _thread_in_native");
4804 jlong cur, end;
4805 int mode;
4806 struct stat64 buf64;
4807
4808 if (::fstat64(fd, &buf64) >= 0) {
4809 mode = buf64.st_mode;
4810 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4811 int n,ioctl_return;
4812
4813 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4814 if (ioctl_return>= 0) {
4815 *bytes = n;
4816 return 1;
4817 }
4818 }
4819 }
4820 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4821 return 0;
4822 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4823 return 0;
4824 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4825 return 0;
4826 }
4827 *bytes = end - cur;
4828 return 1;
4829 }
4830
4831 // Map a block of memory.
4832 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4833 char *addr, size_t bytes, bool read_only,
4834 bool allow_exec) {
4835 int prot;
4836 int flags;
4837
4838 if (read_only) {
4839 prot = PROT_READ;
4840 flags = MAP_SHARED;
4841 } else {
4842 prot = PROT_READ | PROT_WRITE;
4843 flags = MAP_PRIVATE;
4844 }
4845
4846 if (allow_exec) {
4847 prot |= PROT_EXEC;
4848 }
4849
4850 if (addr != NULL) {
4851 flags |= MAP_FIXED;
4852 }
4853
4854 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4855 fd, file_offset);
4856 if (mapped_address == MAP_FAILED) {
4857 return NULL;
4858 }
4859 return mapped_address;
4860 }
4861
4862
4863 // Remap a block of memory.
4864 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4865 char *addr, size_t bytes, bool read_only,
4866 bool allow_exec) {
4867 // same as map_memory() on this OS
4868 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4869 allow_exec);
4870 }
4871
4872
4873 // Unmap a block of memory.
4874 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4875 return munmap(addr, bytes) == 0;
4876 }
4877
4878 void os::pause() {
4879 char filename[MAX_PATH];
4880 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4881 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4882 } else {
4883 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4884 }
4885
4886 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4887 if (fd != -1) {
4888 struct stat buf;
4889 ::close(fd);
4890 while (::stat(filename, &buf) == 0) {
4891 (void)::poll(NULL, 0, 100);
4892 }
4893 } else {
4894 jio_fprintf(stderr,
4895 "Could not open pause file '%s', continuing immediately.\n", filename);
4896 }
4897 }
4898
4899 #ifndef PRODUCT
4900 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4901 // Turn this on if you need to trace synch operations.
4902 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4903 // and call record_synch_enable and record_synch_disable
4904 // around the computation of interest.
4905
4906 void record_synch(char* name, bool returning); // defined below
4907
4908 class RecordSynch {
4909 char* _name;
4910 public:
4911 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4912 ~RecordSynch() { record_synch(_name, true); }
4913 };
4914
4915 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4916 extern "C" ret name params { \
4917 typedef ret name##_t params; \
4918 static name##_t* implem = NULL; \
4919 static int callcount = 0; \
4920 if (implem == NULL) { \
4921 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4922 if (implem == NULL) fatal(dlerror()); \
4923 } \
4924 ++callcount; \
4925 RecordSynch _rs(#name); \
4926 inner; \
4927 return implem args; \
4928 }
4929 // in dbx, examine callcounts this way:
4930 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4931
4932 #define CHECK_POINTER_OK(p) \
4933 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4934 #define CHECK_MU \
4935 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4936 #define CHECK_CV \
4937 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4938 #define CHECK_P(p) \
4939 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4940
4941 #define CHECK_MUTEX(mutex_op) \
4942 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4943
4944 CHECK_MUTEX( mutex_lock)
4945 CHECK_MUTEX( _mutex_lock)
4946 CHECK_MUTEX( mutex_unlock)
4947 CHECK_MUTEX(_mutex_unlock)
4948 CHECK_MUTEX( mutex_trylock)
4949 CHECK_MUTEX(_mutex_trylock)
4950
4951 #define CHECK_COND(cond_op) \
4952 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4953
4954 CHECK_COND( cond_wait);
4955 CHECK_COND(_cond_wait);
4956 CHECK_COND(_cond_wait_cancel);
4957
4958 #define CHECK_COND2(cond_op) \
4959 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4960
4961 CHECK_COND2( cond_timedwait);
4962 CHECK_COND2(_cond_timedwait);
4963 CHECK_COND2(_cond_timedwait_cancel);
4964
4965 // do the _lwp_* versions too
4966 #define mutex_t lwp_mutex_t
4967 #define cond_t lwp_cond_t
4968 CHECK_MUTEX( _lwp_mutex_lock)
4969 CHECK_MUTEX( _lwp_mutex_unlock)
4970 CHECK_MUTEX( _lwp_mutex_trylock)
4971 CHECK_MUTEX( __lwp_mutex_lock)
4972 CHECK_MUTEX( __lwp_mutex_unlock)
4973 CHECK_MUTEX( __lwp_mutex_trylock)
4974 CHECK_MUTEX(___lwp_mutex_lock)
4975 CHECK_MUTEX(___lwp_mutex_unlock)
4976
4977 CHECK_COND( _lwp_cond_wait);
4978 CHECK_COND( __lwp_cond_wait);
4979 CHECK_COND(___lwp_cond_wait);
4980
4981 CHECK_COND2( _lwp_cond_timedwait);
4982 CHECK_COND2( __lwp_cond_timedwait);
4983 #undef mutex_t
4984 #undef cond_t
4985
4986 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4987 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4988 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4989 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4990 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4991 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4992 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4993 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4994
4995
4996 // recording machinery:
4997
4998 enum { RECORD_SYNCH_LIMIT = 200 };
4999 char* record_synch_name[RECORD_SYNCH_LIMIT];
5000 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
5001 bool record_synch_returning[RECORD_SYNCH_LIMIT];
5002 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
5003 int record_synch_count = 0;
5004 bool record_synch_enabled = false;
5005
5006 // in dbx, examine recorded data this way:
5007 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
5008
5009 void record_synch(char* name, bool returning) {
5010 if (record_synch_enabled) {
5011 if (record_synch_count < RECORD_SYNCH_LIMIT) {
5012 record_synch_name[record_synch_count] = name;
5013 record_synch_returning[record_synch_count] = returning;
5014 record_synch_thread[record_synch_count] = thr_self();
5015 record_synch_arg0ptr[record_synch_count] = &name;
5016 record_synch_count++;
5017 }
5018 // put more checking code here:
5019 // ...
5020 }
5021 }
5022
5023 void record_synch_enable() {
5024 // start collecting trace data, if not already doing so
5025 if (!record_synch_enabled) record_synch_count = 0;
5026 record_synch_enabled = true;
5027 }
5028
5029 void record_synch_disable() {
5030 // stop collecting trace data
5031 record_synch_enabled = false;
5032 }
5033
5034 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5035 #endif // PRODUCT
5036
5037 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5038 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5039 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5040
5041
5042 // JVMTI & JVM monitoring and management support
5043 // The thread_cpu_time() and current_thread_cpu_time() are only
5044 // supported if is_thread_cpu_time_supported() returns true.
5045 // They are not supported on Solaris T1.
5046
5047 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5048 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5049 // of a thread.
5050 //
5051 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5052 // returns the fast estimate available on the platform.
5053
5054 // hrtime_t gethrvtime() return value includes
5055 // user time but does not include system time
5056 jlong os::current_thread_cpu_time() {
5057 return (jlong) gethrvtime();
5058 }
5059
5060 jlong os::thread_cpu_time(Thread *thread) {
5061 // return user level CPU time only to be consistent with
5062 // what current_thread_cpu_time returns.
5063 // thread_cpu_time_info() must be changed if this changes
5064 return os::thread_cpu_time(thread, false /* user time only */);
5065 }
5066
5067 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5068 if (user_sys_cpu_time) {
5069 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5070 } else {
5071 return os::current_thread_cpu_time();
5072 }
5073 }
5074
5075 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5076 char proc_name[64];
5077 int count;
5078 prusage_t prusage;
5079 jlong lwp_time;
5080 int fd;
5081
5082 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5083 getpid(),
5084 thread->osthread()->lwp_id());
5085 fd = ::open(proc_name, O_RDONLY);
5086 if (fd == -1) return -1;
5087
5088 do {
5089 count = ::pread(fd,
5090 (void *)&prusage.pr_utime,
5091 thr_time_size,
5092 thr_time_off);
5093 } while (count < 0 && errno == EINTR);
5094 ::close(fd);
5095 if (count < 0) return -1;
5096
5097 if (user_sys_cpu_time) {
5098 // user + system CPU time
5099 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5100 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5101 (jlong)prusage.pr_stime.tv_nsec +
5102 (jlong)prusage.pr_utime.tv_nsec;
5103 } else {
5104 // user level CPU time only
5105 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5106 (jlong)prusage.pr_utime.tv_nsec;
5107 }
5108
5109 return (lwp_time);
5110 }
5111
5112 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5113 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5114 info_ptr->may_skip_backward = false; // elapsed time not wall time
5115 info_ptr->may_skip_forward = false; // elapsed time not wall time
5116 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5117 }
5118
5119 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5120 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5121 info_ptr->may_skip_backward = false; // elapsed time not wall time
5122 info_ptr->may_skip_forward = false; // elapsed time not wall time
5123 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5124 }
5125
5126 bool os::is_thread_cpu_time_supported() {
5127 return true;
5128 }
5129
5130 // System loadavg support. Returns -1 if load average cannot be obtained.
5131 // Return the load average for our processor set if the primitive exists
5132 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5133 int os::loadavg(double loadavg[], int nelem) {
5134 if (pset_getloadavg_ptr != NULL) {
5135 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5136 } else {
5137 return ::getloadavg(loadavg, nelem);
5138 }
5139 }
5140
5141 //---------------------------------------------------------------------------------
5142
5143 bool os::find(address addr, outputStream* st) {
5144 Dl_info dlinfo;
5145 memset(&dlinfo, 0, sizeof(dlinfo));
5146 if (dladdr(addr, &dlinfo) != 0) {
5147 st->print(PTR_FORMAT ": ", addr);
5148 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5149 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5150 } else if (dlinfo.dli_fbase != NULL) {
5151 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5152 } else {
5153 st->print("<absolute address>");
5154 }
5155 if (dlinfo.dli_fname != NULL) {
5156 st->print(" in %s", dlinfo.dli_fname);
5157 }
5158 if (dlinfo.dli_fbase != NULL) {
5159 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5160 }
5161 st->cr();
5162
5163 if (Verbose) {
5164 // decode some bytes around the PC
5165 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5166 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5167 address lowest = (address) dlinfo.dli_sname;
5168 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5169 if (begin < lowest) begin = lowest;
5170 Dl_info dlinfo2;
5171 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5172 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
5173 end = (address) dlinfo2.dli_saddr;
5174 }
5175 Disassembler::decode(begin, end, st);
5176 }
5177 return true;
5178 }
5179 return false;
5180 }
5181
5182 // Following function has been added to support HotSparc's libjvm.so running
5183 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5184 // src/solaris/hpi/native_threads in the EVM codebase.
5185 //
5186 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5187 // libraries and should thus be removed. We will leave it behind for a while
5188 // until we no longer want to able to run on top of 1.3.0 Solaris production
5189 // JDK. See 4341971.
5190
5191 #define STACK_SLACK 0x800
5192
5193 extern "C" {
5194 intptr_t sysThreadAvailableStackWithSlack() {
5195 stack_t st;
5196 intptr_t retval, stack_top;
5197 retval = thr_stksegment(&st);
5198 assert(retval == 0, "incorrect return value from thr_stksegment");
5199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5201 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5202 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5203 }
5204 }
5205
5206 // ObjectMonitor park-unpark infrastructure ...
5207 //
5208 // We implement Solaris and Linux PlatformEvents with the
5209 // obvious condvar-mutex-flag triple.
5210 // Another alternative that works quite well is pipes:
5211 // Each PlatformEvent consists of a pipe-pair.
5212 // The thread associated with the PlatformEvent
5213 // calls park(), which reads from the input end of the pipe.
5214 // Unpark() writes into the other end of the pipe.
5215 // The write-side of the pipe must be set NDELAY.
5216 // Unfortunately pipes consume a large # of handles.
5217 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5218 // Using pipes for the 1st few threads might be workable, however.
5219 //
5220 // park() is permitted to return spuriously.
5221 // Callers of park() should wrap the call to park() in
5222 // an appropriate loop. A litmus test for the correct
5223 // usage of park is the following: if park() were modified
5224 // to immediately return 0 your code should still work,
5225 // albeit degenerating to a spin loop.
5226 //
5227 // In a sense, park()-unpark() just provides more polite spinning
5228 // and polling with the key difference over naive spinning being
5229 // that a parked thread needs to be explicitly unparked() in order
5230 // to wake up and to poll the underlying condition.
5231 //
5232 // Assumption:
5233 // Only one parker can exist on an event, which is why we allocate
5234 // them per-thread. Multiple unparkers can coexist.
5235 //
5236 // _Event transitions in park()
5237 // -1 => -1 : illegal
5238 // 1 => 0 : pass - return immediately
5239 // 0 => -1 : block; then set _Event to 0 before returning
5240 //
5241 // _Event transitions in unpark()
5242 // 0 => 1 : just return
5243 // 1 => 1 : just return
5244 // -1 => either 0 or 1; must signal target thread
5245 // That is, we can safely transition _Event from -1 to either
5246 // 0 or 1.
5247 //
5248 // _Event serves as a restricted-range semaphore.
5249 // -1 : thread is blocked, i.e. there is a waiter
5250 // 0 : neutral: thread is running or ready,
5251 // could have been signaled after a wait started
5252 // 1 : signaled - thread is running or ready
5253 //
5254 // Another possible encoding of _Event would be with
5255 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5256 //
5257 // TODO-FIXME: add DTRACE probes for:
5258 // 1. Tx parks
5259 // 2. Ty unparks Tx
5260 // 3. Tx resumes from park
5261
5262
5263 // value determined through experimentation
5264 #define ROUNDINGFIX 11
5265
5266 // utility to compute the abstime argument to timedwait.
5267 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5268
5269 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5270 // millis is the relative timeout time
5271 // abstime will be the absolute timeout time
5272 if (millis < 0) millis = 0;
5273 struct timeval now;
5274 int status = gettimeofday(&now, NULL);
5275 assert(status == 0, "gettimeofday");
5276 jlong seconds = millis / 1000;
5277 jlong max_wait_period;
5278
5279 if (UseLWPSynchronization) {
5280 // forward port of fix for 4275818 (not sleeping long enough)
5281 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5282 // _lwp_cond_timedwait() used a round_down algorithm rather
5283 // than a round_up. For millis less than our roundfactor
5284 // it rounded down to 0 which doesn't meet the spec.
5285 // For millis > roundfactor we may return a bit sooner, but
5286 // since we can not accurately identify the patch level and
5287 // this has already been fixed in Solaris 9 and 8 we will
5288 // leave it alone rather than always rounding down.
5289
5290 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5291 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5292 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5293 max_wait_period = 21000000;
5294 } else {
5295 max_wait_period = 50000000;
5296 }
5297 millis %= 1000;
5298 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5299 seconds = max_wait_period;
5300 }
5301 abstime->tv_sec = now.tv_sec + seconds;
5302 long usec = now.tv_usec + millis * 1000;
5303 if (usec >= 1000000) {
5304 abstime->tv_sec += 1;
5305 usec -= 1000000;
5306 }
5307 abstime->tv_nsec = usec * 1000;
5308 return abstime;
5309 }
5310
5311 void os::PlatformEvent::park() { // AKA: down()
5312 // Transitions for _Event:
5313 // -1 => -1 : illegal
5314 // 1 => 0 : pass - return immediately
5315 // 0 => -1 : block; then set _Event to 0 before returning
5316
5317 // Invariant: Only the thread associated with the Event/PlatformEvent
5318 // may call park().
5319 assert(_nParked == 0, "invariant");
5320
5321 int v;
5322 for (;;) {
5323 v = _Event;
5324 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5325 }
5326 guarantee(v >= 0, "invariant");
5327 if (v == 0) {
5328 // Do this the hard way by blocking ...
5329 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5330 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5331 // Only for SPARC >= V8PlusA
5332 #if defined(__sparc) && defined(COMPILER2)
5333 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5334 #endif
5335 int status = os::Solaris::mutex_lock(_mutex);
5336 assert_status(status == 0, status, "mutex_lock");
5337 guarantee(_nParked == 0, "invariant");
5338 ++_nParked;
5339 while (_Event < 0) {
5340 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5341 // Treat this the same as if the wait was interrupted
5342 // With usr/lib/lwp going to kernel, always handle ETIME
5343 status = os::Solaris::cond_wait(_cond, _mutex);
5344 if (status == ETIME) status = EINTR;
5345 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5346 }
5347 --_nParked;
5348 _Event = 0;
5349 status = os::Solaris::mutex_unlock(_mutex);
5350 assert_status(status == 0, status, "mutex_unlock");
5351 // Paranoia to ensure our locked and lock-free paths interact
5352 // correctly with each other.
5353 OrderAccess::fence();
5354 }
5355 }
5356
5357 int os::PlatformEvent::park(jlong millis) {
5358 // Transitions for _Event:
5359 // -1 => -1 : illegal
5360 // 1 => 0 : pass - return immediately
5361 // 0 => -1 : block; then set _Event to 0 before returning
5362
5363 guarantee(_nParked == 0, "invariant");
5364 int v;
5365 for (;;) {
5366 v = _Event;
5367 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5368 }
5369 guarantee(v >= 0, "invariant");
5370 if (v != 0) return OS_OK;
5371
5372 int ret = OS_TIMEOUT;
5373 timestruc_t abst;
5374 compute_abstime(&abst, millis);
5375
5376 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5377 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5378 // Only for SPARC >= V8PlusA
5379 #if defined(__sparc) && defined(COMPILER2)
5380 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5381 #endif
5382 int status = os::Solaris::mutex_lock(_mutex);
5383 assert_status(status == 0, status, "mutex_lock");
5384 guarantee(_nParked == 0, "invariant");
5385 ++_nParked;
5386 while (_Event < 0) {
5387 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5388 assert_status(status == 0 || status == EINTR ||
5389 status == ETIME || status == ETIMEDOUT,
5390 status, "cond_timedwait");
5391 if (!FilterSpuriousWakeups) break; // previous semantics
5392 if (status == ETIME || status == ETIMEDOUT) break;
5393 // We consume and ignore EINTR and spurious wakeups.
5394 }
5395 --_nParked;
5396 if (_Event >= 0) ret = OS_OK;
5397 _Event = 0;
5398 status = os::Solaris::mutex_unlock(_mutex);
5399 assert_status(status == 0, status, "mutex_unlock");
5400 // Paranoia to ensure our locked and lock-free paths interact
5401 // correctly with each other.
5402 OrderAccess::fence();
5403 return ret;
5404 }
5405
5406 void os::PlatformEvent::unpark() {
5407 // Transitions for _Event:
5408 // 0 => 1 : just return
5409 // 1 => 1 : just return
5410 // -1 => either 0 or 1; must signal target thread
5411 // That is, we can safely transition _Event from -1 to either
5412 // 0 or 1.
5413 // See also: "Semaphores in Plan 9" by Mullender & Cox
5414 //
5415 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5416 // that it will take two back-to-back park() calls for the owning
5417 // thread to block. This has the benefit of forcing a spurious return
5418 // from the first park() call after an unpark() call which will help
5419 // shake out uses of park() and unpark() without condition variables.
5420
5421 if (Atomic::xchg(1, &_Event) >= 0) return;
5422
5423 // If the thread associated with the event was parked, wake it.
5424 // Wait for the thread assoc with the PlatformEvent to vacate.
5425 int status = os::Solaris::mutex_lock(_mutex);
5426 assert_status(status == 0, status, "mutex_lock");
5427 int AnyWaiters = _nParked;
5428 status = os::Solaris::mutex_unlock(_mutex);
5429 assert_status(status == 0, status, "mutex_unlock");
5430 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5431 if (AnyWaiters != 0) {
5432 // Note that we signal() *after* dropping the lock for "immortal" Events.
5433 // This is safe and avoids a common class of futile wakeups. In rare
5434 // circumstances this can cause a thread to return prematurely from
5435 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5436 // will simply re-test the condition and re-park itself.
5437 // This provides particular benefit if the underlying platform does not
5438 // provide wait morphing.
5439 status = os::Solaris::cond_signal(_cond);
5440 assert_status(status == 0, status, "cond_signal");
5441 }
5442 }
5443
5444 // JSR166
5445 // -------------------------------------------------------
5446
5447 // The solaris and linux implementations of park/unpark are fairly
5448 // conservative for now, but can be improved. They currently use a
5449 // mutex/condvar pair, plus _counter.
5450 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5451 // sets count to 1 and signals condvar. Only one thread ever waits
5452 // on the condvar. Contention seen when trying to park implies that someone
5453 // is unparking you, so don't wait. And spurious returns are fine, so there
5454 // is no need to track notifications.
5455
5456 #define MAX_SECS 100000000
5457
5458 // This code is common to linux and solaris and will be moved to a
5459 // common place in dolphin.
5460 //
5461 // The passed in time value is either a relative time in nanoseconds
5462 // or an absolute time in milliseconds. Either way it has to be unpacked
5463 // into suitable seconds and nanoseconds components and stored in the
5464 // given timespec structure.
5465 // Given time is a 64-bit value and the time_t used in the timespec is only
5466 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5467 // overflow if times way in the future are given. Further on Solaris versions
5468 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5469 // number of seconds, in abstime, is less than current_time + 100,000,000.
5470 // As it will be 28 years before "now + 100000000" will overflow we can
5471 // ignore overflow and just impose a hard-limit on seconds using the value
5472 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5473 // years from "now".
5474 //
5475 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5476 assert(time > 0, "convertTime");
5477
5478 struct timeval now;
5479 int status = gettimeofday(&now, NULL);
5480 assert(status == 0, "gettimeofday");
5481
5482 time_t max_secs = now.tv_sec + MAX_SECS;
5483
5484 if (isAbsolute) {
5485 jlong secs = time / 1000;
5486 if (secs > max_secs) {
5487 absTime->tv_sec = max_secs;
5488 } else {
5489 absTime->tv_sec = secs;
5490 }
5491 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5492 } else {
5493 jlong secs = time / NANOSECS_PER_SEC;
5494 if (secs >= MAX_SECS) {
5495 absTime->tv_sec = max_secs;
5496 absTime->tv_nsec = 0;
5497 } else {
5498 absTime->tv_sec = now.tv_sec + secs;
5499 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5500 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5501 absTime->tv_nsec -= NANOSECS_PER_SEC;
5502 ++absTime->tv_sec; // note: this must be <= max_secs
5503 }
5504 }
5505 }
5506 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5507 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5508 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5509 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5510 }
5511
5512 void Parker::park(bool isAbsolute, jlong time) {
5513 // Ideally we'd do something useful while spinning, such
5514 // as calling unpackTime().
5515
5516 // Optional fast-path check:
5517 // Return immediately if a permit is available.
5518 // We depend on Atomic::xchg() having full barrier semantics
5519 // since we are doing a lock-free update to _counter.
5520 if (Atomic::xchg(0, &_counter) > 0) return;
5521
5522 // Optional fast-exit: Check interrupt before trying to wait
5523 Thread* thread = Thread::current();
5524 assert(thread->is_Java_thread(), "Must be JavaThread");
5525 JavaThread *jt = (JavaThread *)thread;
5526 if (Thread::is_interrupted(thread, false)) {
5527 return;
5528 }
5529
5530 // First, demultiplex/decode time arguments
5531 timespec absTime;
5532 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5533 return;
5534 }
5535 if (time > 0) {
5536 // Warning: this code might be exposed to the old Solaris time
5537 // round-down bugs. Grep "roundingFix" for details.
5538 unpackTime(&absTime, isAbsolute, time);
5539 }
5540
5541 // Enter safepoint region
5542 // Beware of deadlocks such as 6317397.
5543 // The per-thread Parker:: _mutex is a classic leaf-lock.
5544 // In particular a thread must never block on the Threads_lock while
5545 // holding the Parker:: mutex. If safepoints are pending both the
5546 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5547 ThreadBlockInVM tbivm(jt);
5548
5549 // Don't wait if cannot get lock since interference arises from
5550 // unblocking. Also. check interrupt before trying wait
5551 if (Thread::is_interrupted(thread, false) ||
5552 os::Solaris::mutex_trylock(_mutex) != 0) {
5553 return;
5554 }
5555
5556 int status;
5557
5558 if (_counter > 0) { // no wait needed
5559 _counter = 0;
5560 status = os::Solaris::mutex_unlock(_mutex);
5561 assert(status == 0, "invariant");
5562 // Paranoia to ensure our locked and lock-free paths interact
5563 // correctly with each other and Java-level accesses.
5564 OrderAccess::fence();
5565 return;
5566 }
5567
5568 #ifdef ASSERT
5569 // Don't catch signals while blocked; let the running threads have the signals.
5570 // (This allows a debugger to break into the running thread.)
5571 sigset_t oldsigs;
5572 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5573 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5574 #endif
5575
5576 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5577 jt->set_suspend_equivalent();
5578 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5579
5580 // Do this the hard way by blocking ...
5581 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5582 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5583 // Only for SPARC >= V8PlusA
5584 #if defined(__sparc) && defined(COMPILER2)
5585 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5586 #endif
5587
5588 if (time == 0) {
5589 status = os::Solaris::cond_wait(_cond, _mutex);
5590 } else {
5591 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5592 }
5593 // Note that an untimed cond_wait() can sometimes return ETIME on older
5594 // versions of the Solaris.
5595 assert_status(status == 0 || status == EINTR ||
5596 status == ETIME || status == ETIMEDOUT,
5597 status, "cond_timedwait");
5598
5599 #ifdef ASSERT
5600 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
5601 #endif
5602 _counter = 0;
5603 status = os::Solaris::mutex_unlock(_mutex);
5604 assert_status(status == 0, status, "mutex_unlock");
5605 // Paranoia to ensure our locked and lock-free paths interact
5606 // correctly with each other and Java-level accesses.
5607 OrderAccess::fence();
5608
5609 // If externally suspended while waiting, re-suspend
5610 if (jt->handle_special_suspend_equivalent_condition()) {
5611 jt->java_suspend_self();
5612 }
5613 }
5614
5615 void Parker::unpark() {
5616 int status = os::Solaris::mutex_lock(_mutex);
5617 assert(status == 0, "invariant");
5618 const int s = _counter;
5619 _counter = 1;
5620 status = os::Solaris::mutex_unlock(_mutex);
5621 assert(status == 0, "invariant");
5622
5623 if (s < 1) {
5624 status = os::Solaris::cond_signal(_cond);
5625 assert(status == 0, "invariant");
5626 }
5627 }
5628
5629 extern char** environ;
5630
5631 // Run the specified command in a separate process. Return its exit value,
5632 // or -1 on failure (e.g. can't fork a new process).
5633 // Unlike system(), this function can be called from signal handler. It
5634 // doesn't block SIGINT et al.
5635 int os::fork_and_exec(char* cmd) {
5636 char * argv[4];
5637 argv[0] = (char *)"sh";
5638 argv[1] = (char *)"-c";
5639 argv[2] = cmd;
5640 argv[3] = NULL;
5641
5642 // fork is async-safe, fork1 is not so can't use in signal handler
5643 pid_t pid;
5644 Thread* t = Thread::current_or_null_safe();
5645 if (t != NULL && t->is_inside_signal_handler()) {
5646 pid = fork();
5647 } else {
5648 pid = fork1();
5649 }
5650
5651 if (pid < 0) {
5652 // fork failed
5653 warning("fork failed: %s", os::strerror(errno));
5654 return -1;
5655
5656 } else if (pid == 0) {
5657 // child process
5658
5659 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5660 execve("/usr/bin/sh", argv, environ);
5661
5662 // execve failed
5663 _exit(-1);
5664
5665 } else {
5666 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5667 // care about the actual exit code, for now.
5668
5669 int status;
5670
5671 // Wait for the child process to exit. This returns immediately if
5672 // the child has already exited. */
5673 while (waitpid(pid, &status, 0) < 0) {
5674 switch (errno) {
5675 case ECHILD: return 0;
5676 case EINTR: break;
5677 default: return -1;
5678 }
5679 }
5680
5681 if (WIFEXITED(status)) {
5682 // The child exited normally; get its exit code.
5683 return WEXITSTATUS(status);
5684 } else if (WIFSIGNALED(status)) {
5685 // The child exited because of a signal
5686 // The best value to return is 0x80 + signal number,
5687 // because that is what all Unix shells do, and because
5688 // it allows callers to distinguish between process exit and
5689 // process death by signal.
5690 return 0x80 + WTERMSIG(status);
5691 } else {
5692 // Unknown exit code; pass it through
5693 return status;
5694 }
5695 }
5696 }
5697
5698 // is_headless_jre()
5699 //
5700 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5701 // in order to report if we are running in a headless jre
5702 //
5703 // Since JDK8 xawt/libmawt.so was moved into the same directory
5704 // as libawt.so, and renamed libawt_xawt.so
5705 //
5706 bool os::is_headless_jre() {
5707 struct stat statbuf;
5708 char buf[MAXPATHLEN];
5709 char libmawtpath[MAXPATHLEN];
5710 const char *xawtstr = "/xawt/libmawt.so";
5711 const char *new_xawtstr = "/libawt_xawt.so";
5712 char *p;
5713
5714 // Get path to libjvm.so
5715 os::jvm_path(buf, sizeof(buf));
5716
5717 // Get rid of libjvm.so
5718 p = strrchr(buf, '/');
5719 if (p == NULL) {
5720 return false;
5721 } else {
5722 *p = '\0';
5723 }
5724
5725 // Get rid of client or server
5726 p = strrchr(buf, '/');
5727 if (p == NULL) {
5728 return false;
5729 } else {
5730 *p = '\0';
5731 }
5732
5733 // check xawt/libmawt.so
5734 strcpy(libmawtpath, buf);
5735 strcat(libmawtpath, xawtstr);
5736 if (::stat(libmawtpath, &statbuf) == 0) return false;
5737
5738 // check libawt_xawt.so
5739 strcpy(libmawtpath, buf);
5740 strcat(libmawtpath, new_xawtstr);
5741 if (::stat(libmawtpath, &statbuf) == 0) return false;
5742
5743 return true;
5744 }
5745
5746 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5747 size_t res;
5748 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5749 return res;
5750 }
5751
5752 int os::close(int fd) {
5753 return ::close(fd);
5754 }
5755
5756 int os::socket_close(int fd) {
5757 return ::close(fd);
5758 }
5759
5760 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5761 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5762 "Assumed _thread_in_native");
5763 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5764 }
5765
5766 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5767 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5768 "Assumed _thread_in_native");
5769 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5770 }
5771
5772 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5773 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5774 }
5775
5776 // As both poll and select can be interrupted by signals, we have to be
5777 // prepared to restart the system call after updating the timeout, unless
5778 // a poll() is done with timeout == -1, in which case we repeat with this
5779 // "wait forever" value.
5780
5781 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5782 int _result;
5783 _result = ::connect(fd, him, len);
5784
5785 // On Solaris, when a connect() call is interrupted, the connection
5786 // can be established asynchronously (see 6343810). Subsequent calls
5787 // to connect() must check the errno value which has the semantic
5788 // described below (copied from the connect() man page). Handling
5789 // of asynchronously established connections is required for both
5790 // blocking and non-blocking sockets.
5791 // EINTR The connection attempt was interrupted
5792 // before any data arrived by the delivery of
5793 // a signal. The connection, however, will be
5794 // established asynchronously.
5795 //
5796 // EINPROGRESS The socket is non-blocking, and the connec-
5797 // tion cannot be completed immediately.
5798 //
5799 // EALREADY The socket is non-blocking, and a previous
5800 // connection attempt has not yet been com-
5801 // pleted.
5802 //
5803 // EISCONN The socket is already connected.
5804 if (_result == OS_ERR && errno == EINTR) {
5805 // restarting a connect() changes its errno semantics
5806 RESTARTABLE(::connect(fd, him, len), _result);
5807 // undo these changes
5808 if (_result == OS_ERR) {
5809 if (errno == EALREADY) {
5810 errno = EINPROGRESS; // fall through
5811 } else if (errno == EISCONN) {
5812 errno = 0;
5813 return OS_OK;
5814 }
5815 }
5816 }
5817 return _result;
5818 }
5819
5820 // Get the default path to the core file
5821 // Returns the length of the string
5822 int os::get_core_path(char* buffer, size_t bufferSize) {
5823 const char* p = get_current_directory(buffer, bufferSize);
5824
5825 if (p == NULL) {
5826 assert(p != NULL, "failed to get current directory");
5827 return 0;
5828 }
5829
5830 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5831 p, current_process_id());
5832
5833 return strlen(buffer);
5834 }
5835
5836 #ifndef PRODUCT
5837 void TestReserveMemorySpecial_test() {
5838 // No tests available for this platform
5839 }
5840 #endif
5841
5842 bool os::start_debugging(char *buf, int buflen) {
5843 int len = (int)strlen(buf);
5844 char *p = &buf[len];
5845
5846 jio_snprintf(p, buflen-len,
5847 "\n\n"
5848 "Do you want to debug the problem?\n\n"
5849 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5850 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5851 "Otherwise, press RETURN to abort...",
5852 os::current_process_id(), os::current_thread_id());
5853
5854 bool yes = os::message_box("Unexpected Error", buf);
5855
5856 if (yes) {
5857 // yes, user asked VM to launch debugger
5858 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5859
5860 os::fork_and_exec(buf);
5861 yes = false;
5862 }
5863 return yes;
5864 }
5865
5866 bool os::map_memory_to_file(char* base, size_t size, const char* backingFileDir) {
5867 VMError::report_and_die("Allocating object heap with backing file is not supported for Solaris");
5868 return false;
5869 }