1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "jvm.h"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/disassembler.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logStream.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/filemap.hpp"
39 #include "memory/universe.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "os_share_solaris.hpp"
42 #include "os_solaris.inline.hpp"
43 #include "prims/jniFastGetField.hpp"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.inline.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.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/align.hpp"
69 #include "utilities/decoder.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/macros.hpp"
74 #include "utilities/vmError.hpp"
75
76 // put OS-includes here
77 # include <dlfcn.h>
78 # include <errno.h>
79 # include <exception>
80 # include <link.h>
81 # include <poll.h>
82 # include <pthread.h>
83 # include <setjmp.h>
84 # include <signal.h>
85 # include <stdio.h>
86 # include <alloca.h>
87 # include <sys/filio.h>
88 # include <sys/ipc.h>
89 # include <sys/lwp.h>
90 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
91 # include <sys/mman.h>
92 # include <sys/processor.h>
93 # include <sys/procset.h>
94 # include <sys/pset.h>
95 # include <sys/resource.h>
96 # include <sys/shm.h>
97 # include <sys/socket.h>
98 # include <sys/stat.h>
99 # include <sys/systeminfo.h>
100 # include <sys/time.h>
101 # include <sys/times.h>
102 # include <sys/types.h>
103 # include <sys/wait.h>
104 # include <sys/utsname.h>
105 # include <thread.h>
106 # include <unistd.h>
107 # include <sys/priocntl.h>
108 # include <sys/rtpriocntl.h>
109 # include <sys/tspriocntl.h>
110 # include <sys/iapriocntl.h>
111 # include <sys/fxpriocntl.h>
112 # include <sys/loadavg.h>
113 # include <string.h>
114 # include <stdio.h>
115
116 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
117 # include <sys/procfs.h> // see comment in <sys/procfs.h>
118
119 #define MAX_PATH (2 * K)
120
121 // for timer info max values which include all bits
122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
123
124
125 // Here are some liblgrp types from sys/lgrp_user.h to be able to
126 // compile on older systems without this header file.
127
128 #ifndef MADV_ACCESS_LWP
129 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
130 #endif
131 #ifndef MADV_ACCESS_MANY
132 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
133 #endif
134
135 #ifndef LGRP_RSRC_CPU
136 #define LGRP_RSRC_CPU 0 /* CPU resources */
137 #endif
138 #ifndef LGRP_RSRC_MEM
139 #define LGRP_RSRC_MEM 1 /* memory resources */
140 #endif
141
142 // Values for ThreadPriorityPolicy == 1
143 int prio_policy1[CriticalPriority+1] = {
144 -99999, 0, 16, 32, 48, 64,
145 80, 96, 112, 124, 127, 127 };
146
147 // System parameters used internally
148 static clock_t clock_tics_per_sec = 100;
149
150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
151 static bool enabled_extended_FILE_stdio = false;
152
153 // For diagnostics to print a message once. see run_periodic_checks
154 static bool check_addr0_done = false;
155 static sigset_t check_signal_done;
156 static bool check_signals = true;
157
158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
160
161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
162
163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
164
165 // "default" initializers for missing libc APIs
166 extern "C" {
167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
169
170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
171 static int lwp_cond_destroy(cond_t *cv) { return 0; }
172 }
173
174 // "default" initializers for pthread-based synchronization
175 extern "C" {
176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
178 }
179
180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
181
182 static inline size_t adjust_stack_size(address base, size_t size) {
183 if ((ssize_t)size < 0) {
184 // 4759953: Compensate for ridiculous stack size.
185 size = max_intx;
186 }
187 if (size > (size_t)base) {
188 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
189 size = (size_t)base;
190 }
191 return size;
192 }
193
194 static inline stack_t get_stack_info() {
195 stack_t st;
196 int retval = thr_stksegment(&st);
197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
198 assert(retval == 0, "incorrect return value from thr_stksegment");
199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
201 return st;
202 }
203
204 static void _handle_uncaught_cxx_exception() {
205 VMError::report_and_die("An uncaught C++ exception");
206 }
207
208 bool os::is_primordial_thread(void) {
209 int r = thr_main();
210 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
211 return r == 1;
212 }
213
214 address os::current_stack_base() {
215 bool _is_primordial_thread = is_primordial_thread();
216
217 // Workaround 4352906, avoid calls to thr_stksegment by
218 // thr_main after the first one (it looks like we trash
219 // some data, causing the value for ss_sp to be incorrect).
220 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
221 stack_t st = get_stack_info();
222 if (_is_primordial_thread) {
223 // cache initial value of stack base
224 os::Solaris::_main_stack_base = (address)st.ss_sp;
225 }
226 return (address)st.ss_sp;
227 } else {
228 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
229 return os::Solaris::_main_stack_base;
230 }
231 }
232
233 size_t os::current_stack_size() {
234 size_t size;
235
236 if (!is_primordial_thread()) {
237 size = get_stack_info().ss_size;
238 } else {
239 struct rlimit limits;
240 getrlimit(RLIMIT_STACK, &limits);
241 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
242 }
243 // base may not be page aligned
244 address base = current_stack_base();
245 address bottom = align_up(base - size, os::vm_page_size());;
246 return (size_t)(base - bottom);
247 }
248
249 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
250 return localtime_r(clock, res);
251 }
252
253 void os::Solaris::try_enable_extended_io() {
254 typedef int (*enable_extended_FILE_stdio_t)(int, int);
255
256 if (!UseExtendedFileIO) {
257 return;
258 }
259
260 enable_extended_FILE_stdio_t enabler =
261 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
262 "enable_extended_FILE_stdio");
263 if (enabler) {
264 enabler(-1, -1);
265 }
266 }
267
268 jint os::Solaris::_os_thread_limit = 0;
269 volatile jint os::Solaris::_os_thread_count = 0;
270
271 julong os::available_memory() {
272 return Solaris::available_memory();
273 }
274
275 julong os::Solaris::available_memory() {
276 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
277 }
278
279 julong os::Solaris::_physical_memory = 0;
280
281 julong os::physical_memory() {
282 return Solaris::physical_memory();
283 }
284
285 static hrtime_t first_hrtime = 0;
286 static const hrtime_t hrtime_hz = 1000*1000*1000;
287 static volatile hrtime_t max_hrtime = 0;
288
289
290 void os::Solaris::initialize_system_info() {
291 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
292 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
293 (julong)sysconf(_SC_PAGESIZE);
294 }
295
296 uint os::processor_id() {
297 const processorid_t id = ::getcpuid();
298 assert(id >= 0 && id < _processor_count, "Invalid processor id");
299 return (uint)id;
300 }
301
302 int os::active_processor_count() {
303 // User has overridden the number of active processors
304 if (ActiveProcessorCount > 0) {
305 log_trace(os)("active_processor_count: "
306 "active processor count set by user : %d",
307 ActiveProcessorCount);
308 return ActiveProcessorCount;
309 }
310
311 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
312 pid_t pid = getpid();
313 psetid_t pset = PS_NONE;
314 // Are we running in a processor set or is there any processor set around?
315 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
316 uint_t pset_cpus;
317 // Query the number of cpus available to us.
318 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
319 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
320 return pset_cpus;
321 }
322 }
323 // Otherwise return number of online cpus
324 return online_cpus;
325 }
326
327 void os::set_native_thread_name(const char *name) {
328 if (Solaris::_pthread_setname_np != NULL) {
329 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
330 // but we explicitly copy into a size-limited buffer to avoid any
331 // possible overflow.
332 char buf[32];
333 snprintf(buf, sizeof(buf), "%s", name);
334 buf[sizeof(buf) - 1] = '\0';
335 Solaris::_pthread_setname_np(pthread_self(), buf);
336 }
337 }
338
339 bool os::bind_to_processor(uint processor_id) {
340 // We assume that a processorid_t can be stored in a uint.
341 assert(sizeof(uint) == sizeof(processorid_t),
342 "can't convert uint to processorid_t");
343 int bind_result =
344 processor_bind(P_LWPID, // bind LWP.
345 P_MYID, // bind current LWP.
346 (processorid_t) processor_id, // id.
347 NULL); // don't return old binding.
348 return (bind_result == 0);
349 }
350
351 // Return true if user is running as root.
352
353 bool os::have_special_privileges() {
354 static bool init = false;
355 static bool privileges = false;
356 if (!init) {
357 privileges = (getuid() != geteuid()) || (getgid() != getegid());
358 init = true;
359 }
360 return privileges;
361 }
362
363
364 void os::init_system_properties_values() {
365 // The next steps are taken in the product version:
366 //
367 // Obtain the JAVA_HOME value from the location of libjvm.so.
368 // This library should be located at:
369 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
370 //
371 // If "/jre/lib/" appears at the right place in the path, then we
372 // assume libjvm.so is installed in a JDK and we use this path.
373 //
374 // Otherwise exit with message: "Could not create the Java virtual machine."
375 //
376 // The following extra steps are taken in the debugging version:
377 //
378 // If "/jre/lib/" does NOT appear at the right place in the path
379 // instead of exit check for $JAVA_HOME environment variable.
380 //
381 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
382 // then we append a fake suffix "hotspot/libjvm.so" to this path so
383 // it looks like libjvm.so is installed there
384 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
385 //
386 // Otherwise exit.
387 //
388 // Important note: if the location of libjvm.so changes this
389 // code needs to be changed accordingly.
390
391 // Base path of extensions installed on the system.
392 #define SYS_EXT_DIR "/usr/jdk/packages"
393 #define EXTENSIONS_DIR "/lib/ext"
394
395 // Buffer that fits several sprintfs.
396 // Note that the space for the colon and the trailing null are provided
397 // by the nulls included by the sizeof operator.
398 const size_t bufsize =
399 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
400 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
401 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
402 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
403
404 // sysclasspath, java_home, dll_dir
405 {
406 char *pslash;
407 os::jvm_path(buf, bufsize);
408
409 // Found the full path to libjvm.so.
410 // Now cut the path to <java_home>/jre if we can.
411 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
412 pslash = strrchr(buf, '/');
413 if (pslash != NULL) {
414 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
415 }
416 Arguments::set_dll_dir(buf);
417
418 if (pslash != NULL) {
419 pslash = strrchr(buf, '/');
420 if (pslash != NULL) {
421 *pslash = '\0'; // Get rid of /lib.
422 }
423 }
424 Arguments::set_java_home(buf);
425 if (!set_boot_path('/', ':')) {
426 vm_exit_during_initialization("Failed setting boot class path.", NULL);
427 }
428 }
429
430 // Where to look for native libraries.
431 {
432 // Use dlinfo() to determine the correct java.library.path.
433 //
434 // If we're launched by the Java launcher, and the user
435 // does not set java.library.path explicitly on the commandline,
436 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
437 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
438 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
439 // /usr/lib), which is exactly what we want.
440 //
441 // If the user does set java.library.path, it completely
442 // overwrites this setting, and always has.
443 //
444 // If we're not launched by the Java launcher, we may
445 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
446 // settings. Again, dlinfo does exactly what we want.
447
448 Dl_serinfo info_sz, *info = &info_sz;
449 Dl_serpath *path;
450 char *library_path;
451 char *common_path = buf;
452
453 // Determine search path count and required buffer size.
454 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
455 FREE_C_HEAP_ARRAY(char, buf);
456 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
457 }
458
459 // Allocate new buffer and initialize.
460 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
461 info->dls_size = info_sz.dls_size;
462 info->dls_cnt = info_sz.dls_cnt;
463
464 // Obtain search path information.
465 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
466 FREE_C_HEAP_ARRAY(char, buf);
467 FREE_C_HEAP_ARRAY(char, info);
468 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
469 }
470
471 path = &info->dls_serpath[0];
472
473 // Note: Due to a legacy implementation, most of the library path
474 // is set in the launcher. This was to accomodate linking restrictions
475 // on legacy Solaris implementations (which are no longer supported).
476 // Eventually, all the library path setting will be done here.
477 //
478 // However, to prevent the proliferation of improperly built native
479 // libraries, the new path component /usr/jdk/packages is added here.
480
481 // Construct the invariant part of ld_library_path.
482 sprintf(common_path, SYS_EXT_DIR "/lib");
483
484 // Struct size is more than sufficient for the path components obtained
485 // through the dlinfo() call, so only add additional space for the path
486 // components explicitly added here.
487 size_t library_path_size = info->dls_size + strlen(common_path);
488 library_path = NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
489 library_path[0] = '\0';
490
491 // Construct the desired Java library path from the linker's library
492 // search path.
493 //
494 // For compatibility, it is optimal that we insert the additional path
495 // components specific to the Java VM after those components specified
496 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
497 // infrastructure.
498 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
499 strcpy(library_path, common_path);
500 } else {
501 int inserted = 0;
502 int i;
503 for (i = 0; i < info->dls_cnt; i++, path++) {
504 uint_t flags = path->dls_flags & LA_SER_MASK;
505 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
506 strcat(library_path, common_path);
507 strcat(library_path, os::path_separator());
508 inserted = 1;
509 }
510 strcat(library_path, path->dls_name);
511 strcat(library_path, os::path_separator());
512 }
513 // Eliminate trailing path separator.
514 library_path[strlen(library_path)-1] = '\0';
515 }
516
517 // happens before argument parsing - can't use a trace flag
518 // tty->print_raw("init_system_properties_values: native lib path: ");
519 // tty->print_raw_cr(library_path);
520
521 // Callee copies into its own buffer.
522 Arguments::set_library_path(library_path);
523
524 FREE_C_HEAP_ARRAY(char, library_path);
525 FREE_C_HEAP_ARRAY(char, info);
526 }
527
528 // Extensions directories.
529 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
530 Arguments::set_ext_dirs(buf);
531
532 FREE_C_HEAP_ARRAY(char, buf);
533
534 #undef SYS_EXT_DIR
535 #undef EXTENSIONS_DIR
536 }
537
538 void os::breakpoint() {
539 BREAKPOINT;
540 }
541
542 extern "C" void breakpoint() {
543 // use debugger to set breakpoint here
544 }
545
546 static thread_t main_thread;
547
548 // Thread start routine for all newly created threads
549 extern "C" void* thread_native_entry(void* thread_addr) {
550
551 Thread* thread = (Thread*)thread_addr;
552
553 thread->record_stack_base_and_size();
554
555 // Try to randomize the cache line index of hot stack frames.
556 // This helps when threads of the same stack traces evict each other's
557 // cache lines. The threads can be either from the same JVM instance, or
558 // from different JVM instances. The benefit is especially true for
559 // processors with hyperthreading technology.
560 static int counter = 0;
561 int pid = os::current_process_id();
562 alloca(((pid ^ counter++) & 7) * 128);
563
564 int prio;
565
566 thread->initialize_thread_current();
567
568 OSThread* osthr = thread->osthread();
569
570 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
571
572 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
573 os::current_thread_id());
574
575 if (UseNUMA) {
576 int lgrp_id = os::numa_get_group_id();
577 if (lgrp_id != -1) {
578 thread->set_lgrp_id(lgrp_id);
579 }
580 }
581
582 // Our priority was set when we were created, and stored in the
583 // osthread, but couldn't be passed through to our LWP until now.
584 // So read back the priority and set it again.
585
586 if (osthr->thread_id() != -1) {
587 if (UseThreadPriorities) {
588 int prio = osthr->native_priority();
589 if (ThreadPriorityVerbose) {
590 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
591 INTPTR_FORMAT ", setting priority: %d\n",
592 osthr->thread_id(), osthr->lwp_id(), prio);
593 }
594 os::set_native_priority(thread, prio);
595 }
596 } else if (ThreadPriorityVerbose) {
597 warning("Can't set priority in _start routine, thread id hasn't been set\n");
598 }
599
600 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
601
602 // initialize signal mask for this thread
603 os::Solaris::hotspot_sigmask(thread);
604
605 os::Solaris::init_thread_fpu_state();
606 std::set_terminate(_handle_uncaught_cxx_exception);
607
608 thread->call_run();
609
610 // Note: at this point the thread object may already have deleted itself.
611 // Do not dereference it from here on out.
612
613 // One less thread is executing
614 // When the VMThread gets here, the main thread may have already exited
615 // which frees the CodeHeap containing the Atomic::dec code
616 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
617 Atomic::dec(&os::Solaris::_os_thread_count);
618 }
619
620 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
621
622 if (UseDetachedThreads) {
623 thr_exit(NULL);
624 ShouldNotReachHere();
625 }
626 return NULL;
627 }
628
629 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
630 // Allocate the OSThread object
631 OSThread* osthread = new OSThread(NULL, NULL);
632 if (osthread == NULL) return NULL;
633
634 // Store info on the Solaris thread into the OSThread
635 osthread->set_thread_id(thread_id);
636 osthread->set_lwp_id(_lwp_self());
637
638 if (UseNUMA) {
639 int lgrp_id = os::numa_get_group_id();
640 if (lgrp_id != -1) {
641 thread->set_lgrp_id(lgrp_id);
642 }
643 }
644
645 if (ThreadPriorityVerbose) {
646 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
647 osthread->thread_id(), osthread->lwp_id());
648 }
649
650 // Initial thread state is INITIALIZED, not SUSPENDED
651 osthread->set_state(INITIALIZED);
652
653 return osthread;
654 }
655
656 void os::Solaris::hotspot_sigmask(Thread* thread) {
657 //Save caller's signal mask
658 sigset_t sigmask;
659 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
660 OSThread *osthread = thread->osthread();
661 osthread->set_caller_sigmask(sigmask);
662
663 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
664 if (!ReduceSignalUsage) {
665 if (thread->is_VM_thread()) {
666 // Only the VM thread handles BREAK_SIGNAL ...
667 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
668 } else {
669 // ... all other threads block BREAK_SIGNAL
670 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
671 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
672 }
673 }
674 }
675
676 bool os::create_attached_thread(JavaThread* thread) {
677 #ifdef ASSERT
678 thread->verify_not_published();
679 #endif
680 OSThread* osthread = create_os_thread(thread, thr_self());
681 if (osthread == NULL) {
682 return false;
683 }
684
685 // Initial thread state is RUNNABLE
686 osthread->set_state(RUNNABLE);
687 thread->set_osthread(osthread);
688
689 // initialize signal mask for this thread
690 // and save the caller's signal mask
691 os::Solaris::hotspot_sigmask(thread);
692
693 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
694 os::current_thread_id());
695
696 return true;
697 }
698
699 bool os::create_main_thread(JavaThread* thread) {
700 #ifdef ASSERT
701 thread->verify_not_published();
702 #endif
703 if (_starting_thread == NULL) {
704 _starting_thread = create_os_thread(thread, main_thread);
705 if (_starting_thread == NULL) {
706 return false;
707 }
708 }
709
710 // The primodial thread is runnable from the start
711 _starting_thread->set_state(RUNNABLE);
712
713 thread->set_osthread(_starting_thread);
714
715 // initialize signal mask for this thread
716 // and save the caller's signal mask
717 os::Solaris::hotspot_sigmask(thread);
718
719 return true;
720 }
721
722 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
723 static char* describe_thr_create_attributes(char* buf, size_t buflen,
724 size_t stacksize, long flags) {
725 stringStream ss(buf, buflen);
726 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
727 ss.print("flags: ");
728 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
729 #define ALL(X) \
730 X(THR_SUSPENDED) \
731 X(THR_DETACHED) \
732 X(THR_BOUND) \
733 X(THR_NEW_LWP) \
734 X(THR_DAEMON)
735 ALL(PRINT_FLAG)
736 #undef ALL
737 #undef PRINT_FLAG
738 return buf;
739 }
740
741 // return default stack size for thr_type
742 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
743 // default stack size when not specified by caller is 1M (2M for LP64)
744 size_t s = (BytesPerWord >> 2) * K * K;
745 return s;
746 }
747
748 bool os::create_thread(Thread* thread, ThreadType thr_type,
749 size_t req_stack_size) {
750 // Allocate the OSThread object
751 OSThread* osthread = new OSThread(NULL, NULL);
752 if (osthread == NULL) {
753 return false;
754 }
755
756 if (ThreadPriorityVerbose) {
757 char *thrtyp;
758 switch (thr_type) {
759 case vm_thread:
760 thrtyp = (char *)"vm";
761 break;
762 case cgc_thread:
763 thrtyp = (char *)"cgc";
764 break;
765 case pgc_thread:
766 thrtyp = (char *)"pgc";
767 break;
768 case java_thread:
769 thrtyp = (char *)"java";
770 break;
771 case compiler_thread:
772 thrtyp = (char *)"compiler";
773 break;
774 case watcher_thread:
775 thrtyp = (char *)"watcher";
776 break;
777 default:
778 thrtyp = (char *)"unknown";
779 break;
780 }
781 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
782 }
783
784 // calculate stack size if it's not specified by caller
785 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
786
787 // Initial state is ALLOCATED but not INITIALIZED
788 osthread->set_state(ALLOCATED);
789
790 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
791 // We got lots of threads. Check if we still have some address space left.
792 // Need to be at least 5Mb of unreserved address space. We do check by
793 // trying to reserve some.
794 const size_t VirtualMemoryBangSize = 20*K*K;
795 char* mem = os::reserve_memory(VirtualMemoryBangSize);
796 if (mem == NULL) {
797 delete osthread;
798 return false;
799 } else {
800 // Release the memory again
801 os::release_memory(mem, VirtualMemoryBangSize);
802 }
803 }
804
805 // Setup osthread because the child thread may need it.
806 thread->set_osthread(osthread);
807
808 // Create the Solaris thread
809 thread_t tid = 0;
810 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
811 int status;
812
813 // Mark that we don't have an lwp or thread id yet.
814 // In case we attempt to set the priority before the thread starts.
815 osthread->set_lwp_id(-1);
816 osthread->set_thread_id(-1);
817
818 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
819
820 char buf[64];
821 if (status == 0) {
822 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
823 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
824 } else {
825 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
826 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
827 // Log some OS information which might explain why creating the thread failed.
828 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
829 LogStream st(Log(os, thread)::info());
830 os::Posix::print_rlimit_info(&st);
831 os::print_memory_info(&st);
832 }
833
834 if (status != 0) {
835 thread->set_osthread(NULL);
836 // Need to clean up stuff we've allocated so far
837 delete osthread;
838 return false;
839 }
840
841 Atomic::inc(&os::Solaris::_os_thread_count);
842
843 // Store info on the Solaris thread into the OSThread
844 osthread->set_thread_id(tid);
845
846 // Remember that we created this thread so we can set priority on it
847 osthread->set_vm_created();
848
849 // Most thread types will set an explicit priority before starting the thread,
850 // but for those that don't we need a valid value to read back in thread_native_entry.
851 osthread->set_native_priority(NormPriority);
852
853 // Initial thread state is INITIALIZED, not SUSPENDED
854 osthread->set_state(INITIALIZED);
855
856 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
857 return true;
858 }
859
860 debug_only(static bool signal_sets_initialized = false);
861 static sigset_t unblocked_sigs, vm_sigs;
862
863 void os::Solaris::signal_sets_init() {
864 // Should also have an assertion stating we are still single-threaded.
865 assert(!signal_sets_initialized, "Already initialized");
866 // Fill in signals that are necessarily unblocked for all threads in
867 // the VM. Currently, we unblock the following signals:
868 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
869 // by -Xrs (=ReduceSignalUsage));
870 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
871 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
872 // the dispositions or masks wrt these signals.
873 // Programs embedding the VM that want to use the above signals for their
874 // own purposes must, at this time, use the "-Xrs" option to prevent
875 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
876 // (See bug 4345157, and other related bugs).
877 // In reality, though, unblocking these signals is really a nop, since
878 // these signals are not blocked by default.
879 sigemptyset(&unblocked_sigs);
880 sigaddset(&unblocked_sigs, SIGILL);
881 sigaddset(&unblocked_sigs, SIGSEGV);
882 sigaddset(&unblocked_sigs, SIGBUS);
883 sigaddset(&unblocked_sigs, SIGFPE);
884 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
885
886 if (!ReduceSignalUsage) {
887 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
888 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
889 }
890 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
891 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
892 }
893 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
894 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
895 }
896 }
897 // Fill in signals that are blocked by all but the VM thread.
898 sigemptyset(&vm_sigs);
899 if (!ReduceSignalUsage) {
900 sigaddset(&vm_sigs, BREAK_SIGNAL);
901 }
902 debug_only(signal_sets_initialized = true);
903
904 // For diagnostics only used in run_periodic_checks
905 sigemptyset(&check_signal_done);
906 }
907
908 // These are signals that are unblocked while a thread is running Java.
909 // (For some reason, they get blocked by default.)
910 sigset_t* os::Solaris::unblocked_signals() {
911 assert(signal_sets_initialized, "Not initialized");
912 return &unblocked_sigs;
913 }
914
915 // These are the signals that are blocked while a (non-VM) thread is
916 // running Java. Only the VM thread handles these signals.
917 sigset_t* os::Solaris::vm_signals() {
918 assert(signal_sets_initialized, "Not initialized");
919 return &vm_sigs;
920 }
921
922 // CR 7190089: on Solaris, primordial thread's stack needs adjusting.
923 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited).
924 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) {
925 assert(is_primordial_thread(), "Call only for primordial thread");
926
927 JavaThread* jt = (JavaThread *)thr;
928 assert(jt != NULL, "Sanity check");
929 size_t stack_size;
930 address base = jt->stack_base();
931 if (Arguments::created_by_java_launcher()) {
932 // Use 2MB to allow for Solaris 7 64 bit mode.
933 stack_size = JavaThread::stack_size_at_create() == 0
934 ? 2048*K : JavaThread::stack_size_at_create();
935
936 // There are rare cases when we may have already used more than
937 // the basic stack size allotment before this method is invoked.
938 // Attempt to allow for a normally sized java_stack.
939 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
940 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
941 } else {
942 // 6269555: If we were not created by a Java launcher, i.e. if we are
943 // running embedded in a native application, treat the primordial thread
944 // as much like a native attached thread as possible. This means using
945 // the current stack size from thr_stksegment(), unless it is too large
946 // to reliably setup guard pages. A reasonable max size is 8MB.
947 size_t current_size = os::current_stack_size();
948 // This should never happen, but just in case....
949 if (current_size == 0) current_size = 2 * K * K;
950 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
951 }
952 address bottom = align_up(base - stack_size, os::vm_page_size());;
953 stack_size = (size_t)(base - bottom);
954
955 assert(stack_size > 0, "Stack size calculation problem");
956
957 if (stack_size > jt->stack_size()) {
958 #ifndef PRODUCT
959 struct rlimit limits;
960 getrlimit(RLIMIT_STACK, &limits);
961 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
962 assert(size >= jt->stack_size(), "Stack size problem in main thread");
963 #endif
964 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
965 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
966 "See limit(1) to increase the stack size limit.",
967 stack_size / K, jt->stack_size() / K);
968 vm_exit(1);
969 }
970 assert(jt->stack_size() >= stack_size,
971 "Attempt to map more stack than was allocated");
972 jt->set_stack_size(stack_size);
973
974 }
975
976
977
978 // Free Solaris resources related to the OSThread
979 void os::free_thread(OSThread* osthread) {
980 assert(osthread != NULL, "os::free_thread but osthread not set");
981
982 // We are told to free resources of the argument thread,
983 // but we can only really operate on the current thread.
984 assert(Thread::current()->osthread() == osthread,
985 "os::free_thread but not current thread");
986
987 // Restore caller's signal mask
988 sigset_t sigmask = osthread->caller_sigmask();
989 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
990
991 delete osthread;
992 }
993
994 void os::pd_start_thread(Thread* thread) {
995 int status = thr_continue(thread->osthread()->thread_id());
996 assert_status(status == 0, status, "thr_continue failed");
997 }
998
999
1000 intx os::current_thread_id() {
1001 return (intx)thr_self();
1002 }
1003
1004 static pid_t _initial_pid = 0;
1005
1006 int os::current_process_id() {
1007 return (int)(_initial_pid ? _initial_pid : getpid());
1008 }
1009
1010 // gethrtime() should be monotonic according to the documentation,
1011 // but some virtualized platforms are known to break this guarantee.
1012 // getTimeNanos() must be guaranteed not to move backwards, so we
1013 // are forced to add a check here.
1014 inline hrtime_t getTimeNanos() {
1015 const hrtime_t now = gethrtime();
1016 const hrtime_t prev = max_hrtime;
1017 if (now <= prev) {
1018 return prev; // same or retrograde time;
1019 }
1020 const hrtime_t obsv = Atomic::cmpxchg(&max_hrtime, prev, now);
1021 assert(obsv >= prev, "invariant"); // Monotonicity
1022 // If the CAS succeeded then we're done and return "now".
1023 // If the CAS failed and the observed value "obsv" is >= now then
1024 // we should return "obsv". If the CAS failed and now > obsv > prv then
1025 // some other thread raced this thread and installed a new value, in which case
1026 // we could either (a) retry the entire operation, (b) retry trying to install now
1027 // or (c) just return obsv. We use (c). No loop is required although in some cases
1028 // we might discard a higher "now" value in deference to a slightly lower but freshly
1029 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1030 // to (a) or (b) -- and greatly reduces coherence traffic.
1031 // We might also condition (c) on the magnitude of the delta between obsv and now.
1032 // Avoiding excessive CAS operations to hot RW locations is critical.
1033 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1034 return (prev == obsv) ? now : obsv;
1035 }
1036
1037 // Time since start-up in seconds to a fine granularity.
1038 // Used by VMSelfDestructTimer and the MemProfiler.
1039 double os::elapsedTime() {
1040 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1041 }
1042
1043 jlong os::elapsed_counter() {
1044 return (jlong)(getTimeNanos() - first_hrtime);
1045 }
1046
1047 jlong os::elapsed_frequency() {
1048 return hrtime_hz;
1049 }
1050
1051 // Return the real, user, and system times in seconds from an
1052 // arbitrary fixed point in the past.
1053 bool os::getTimesSecs(double* process_real_time,
1054 double* process_user_time,
1055 double* process_system_time) {
1056 struct tms ticks;
1057 clock_t real_ticks = times(&ticks);
1058
1059 if (real_ticks == (clock_t) (-1)) {
1060 return false;
1061 } else {
1062 double ticks_per_second = (double) clock_tics_per_sec;
1063 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1064 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1065 // For consistency return the real time from getTimeNanos()
1066 // converted to seconds.
1067 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1068
1069 return true;
1070 }
1071 }
1072
1073 bool os::supports_vtime() { return true; }
1074
1075 double os::elapsedVTime() {
1076 return (double)gethrvtime() / (double)hrtime_hz;
1077 }
1078
1079 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1080 jlong os::javaTimeMillis() {
1081 timeval t;
1082 if (gettimeofday(&t, NULL) == -1) {
1083 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1084 }
1085 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1086 }
1087
1088 // Must return seconds+nanos since Jan 1 1970. This must use the same
1089 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1090 // we need better than 1ms accuracy
1091 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1092 timeval t;
1093 if (gettimeofday(&t, NULL) == -1) {
1094 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1095 }
1096 seconds = jlong(t.tv_sec);
1097 nanos = jlong(t.tv_usec) * 1000;
1098 }
1099
1100
1101 jlong os::javaTimeNanos() {
1102 return (jlong)getTimeNanos();
1103 }
1104
1105 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1106 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1107 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1108 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1109 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1110 }
1111
1112 char * os::local_time_string(char *buf, size_t buflen) {
1113 struct tm t;
1114 time_t long_time;
1115 time(&long_time);
1116 localtime_r(&long_time, &t);
1117 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1118 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1119 t.tm_hour, t.tm_min, t.tm_sec);
1120 return buf;
1121 }
1122
1123 // Note: os::shutdown() might be called very early during initialization, or
1124 // called from signal handler. Before adding something to os::shutdown(), make
1125 // sure it is async-safe and can handle partially initialized VM.
1126 void os::shutdown() {
1127
1128 // allow PerfMemory to attempt cleanup of any persistent resources
1129 perfMemory_exit();
1130
1131 // needs to remove object in file system
1132 AttachListener::abort();
1133
1134 // flush buffered output, finish log files
1135 ostream_abort();
1136
1137 // Check for abort hook
1138 abort_hook_t abort_hook = Arguments::abort_hook();
1139 if (abort_hook != NULL) {
1140 abort_hook();
1141 }
1142 }
1143
1144 // Note: os::abort() might be called very early during initialization, or
1145 // called from signal handler. Before adding something to os::abort(), make
1146 // sure it is async-safe and can handle partially initialized VM.
1147 void os::abort(bool dump_core, void* siginfo, const void* context) {
1148 os::shutdown();
1149 if (dump_core) {
1150 #ifndef PRODUCT
1151 fdStream out(defaultStream::output_fd());
1152 out.print_raw("Current thread is ");
1153 char buf[16];
1154 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1155 out.print_raw_cr(buf);
1156 out.print_raw_cr("Dumping core ...");
1157 #endif
1158 ::abort(); // dump core (for debugging)
1159 }
1160
1161 ::exit(1);
1162 }
1163
1164 // Die immediately, no exit hook, no abort hook, no cleanup.
1165 // Dump a core file, if possible, for debugging.
1166 void os::die() {
1167 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1168 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1169 // and don't take the time to generate a core file.
1170 os::signal_raise(SIGKILL);
1171 } else {
1172 ::abort();
1173 }
1174 }
1175
1176 // DLL functions
1177
1178 const char* os::dll_file_extension() { return ".so"; }
1179
1180 // This must be hard coded because it's the system's temporary
1181 // directory not the java application's temp directory, ala java.io.tmpdir.
1182 const char* os::get_temp_directory() { return "/tmp"; }
1183
1184 // check if addr is inside libjvm.so
1185 bool os::address_is_in_vm(address addr) {
1186 static address libjvm_base_addr;
1187 Dl_info dlinfo;
1188
1189 if (libjvm_base_addr == NULL) {
1190 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1191 libjvm_base_addr = (address)dlinfo.dli_fbase;
1192 }
1193 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1194 }
1195
1196 if (dladdr((void *)addr, &dlinfo) != 0) {
1197 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1198 }
1199
1200 return false;
1201 }
1202
1203 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1204 static dladdr1_func_type dladdr1_func = NULL;
1205
1206 bool os::dll_address_to_function_name(address addr, char *buf,
1207 int buflen, int * offset,
1208 bool demangle) {
1209 // buf is not optional, but offset is optional
1210 assert(buf != NULL, "sanity check");
1211
1212 Dl_info dlinfo;
1213
1214 // dladdr1_func was initialized in os::init()
1215 if (dladdr1_func != NULL) {
1216 // yes, we have dladdr1
1217
1218 // Support for dladdr1 is checked at runtime; it may be
1219 // available even if the vm is built on a machine that does
1220 // not have dladdr1 support. Make sure there is a value for
1221 // RTLD_DL_SYMENT.
1222 #ifndef RTLD_DL_SYMENT
1223 #define RTLD_DL_SYMENT 1
1224 #endif
1225 #ifdef _LP64
1226 Elf64_Sym * info;
1227 #else
1228 Elf32_Sym * info;
1229 #endif
1230 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1231 RTLD_DL_SYMENT) != 0) {
1232 // see if we have a matching symbol that covers our address
1233 if (dlinfo.dli_saddr != NULL &&
1234 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1235 if (dlinfo.dli_sname != NULL) {
1236 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1237 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1238 }
1239 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1240 return true;
1241 }
1242 }
1243 // no matching symbol so try for just file info
1244 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1245 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1246 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1247 return true;
1248 }
1249 }
1250 }
1251 buf[0] = '\0';
1252 if (offset != NULL) *offset = -1;
1253 return false;
1254 }
1255
1256 // no, only dladdr is available
1257 if (dladdr((void *)addr, &dlinfo) != 0) {
1258 // see if we have a matching symbol
1259 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1260 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1261 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1262 }
1263 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1264 return true;
1265 }
1266 // no matching symbol so try for just file info
1267 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1269 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1270 return true;
1271 }
1272 }
1273 }
1274 buf[0] = '\0';
1275 if (offset != NULL) *offset = -1;
1276 return false;
1277 }
1278
1279 bool os::dll_address_to_library_name(address addr, char* buf,
1280 int buflen, int* offset) {
1281 // buf is not optional, but offset is optional
1282 assert(buf != NULL, "sanity check");
1283
1284 Dl_info dlinfo;
1285
1286 if (dladdr((void*)addr, &dlinfo) != 0) {
1287 if (dlinfo.dli_fname != NULL) {
1288 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1289 }
1290 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1291 *offset = addr - (address)dlinfo.dli_fbase;
1292 }
1293 return true;
1294 }
1295
1296 buf[0] = '\0';
1297 if (offset) *offset = -1;
1298 return false;
1299 }
1300
1301 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1302 Dl_info dli;
1303 // Sanity check?
1304 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1305 dli.dli_fname == NULL) {
1306 return 1;
1307 }
1308
1309 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1310 if (handle == NULL) {
1311 return 1;
1312 }
1313
1314 Link_map *map;
1315 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1316 if (map == NULL) {
1317 dlclose(handle);
1318 return 1;
1319 }
1320
1321 while (map->l_prev != NULL) {
1322 map = map->l_prev;
1323 }
1324
1325 while (map != NULL) {
1326 // Iterate through all map entries and call callback with fields of interest
1327 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1328 dlclose(handle);
1329 return 1;
1330 }
1331 map = map->l_next;
1332 }
1333
1334 dlclose(handle);
1335 return 0;
1336 }
1337
1338 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1339 outputStream * out = (outputStream *) param;
1340 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1341 return 0;
1342 }
1343
1344 void os::print_dll_info(outputStream * st) {
1345 st->print_cr("Dynamic libraries:"); st->flush();
1346 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1347 st->print_cr("Error: Cannot print dynamic libraries.");
1348 }
1349 }
1350
1351 static void change_endianness(Elf32_Half& val) {
1352 unsigned char *ptr = (unsigned char *)&val;
1353 unsigned char swp = ptr[0];
1354 ptr[0] = ptr[1];
1355 ptr[1] = swp;
1356 }
1357
1358 // Loads .dll/.so and
1359 // in case of error it checks if .dll/.so was built for the
1360 // same architecture as Hotspot is running on
1361
1362 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1363 log_info(os)("attempting shared library load of %s", filename);
1364
1365 void * result= ::dlopen(filename, RTLD_LAZY);
1366 if (result != NULL) {
1367 // Successful loading
1368 Events::log(NULL, "Loaded shared library %s", filename);
1369 log_info(os)("shared library load of %s was successful", filename);
1370 return result;
1371 }
1372
1373 Elf32_Ehdr elf_head;
1374 const char* error_report = ::dlerror();
1375 if (error_report == NULL) {
1376 error_report = "dlerror returned no error description";
1377 }
1378 if (ebuf != NULL && ebuflen > 0) {
1379 ::strncpy(ebuf, error_report, ebuflen-1);
1380 ebuf[ebuflen-1]='\0';
1381 }
1382
1383 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1384 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1385
1386 int diag_msg_max_length=ebuflen-strlen(ebuf);
1387 char* diag_msg_buf=ebuf+strlen(ebuf);
1388
1389 if (diag_msg_max_length==0) {
1390 // No more space in ebuf for additional diagnostics message
1391 return NULL;
1392 }
1393
1394
1395 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1396
1397 if (file_descriptor < 0) {
1398 // Can't open library, report dlerror() message
1399 return NULL;
1400 }
1401
1402 bool failed_to_read_elf_head=
1403 (sizeof(elf_head)!=
1404 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1405
1406 ::close(file_descriptor);
1407 if (failed_to_read_elf_head) {
1408 // file i/o error - report dlerror() msg
1409 return NULL;
1410 }
1411
1412 if (elf_head.e_ident[EI_DATA] != LITTLE_ENDIAN_ONLY(ELFDATA2LSB) BIG_ENDIAN_ONLY(ELFDATA2MSB)) {
1413 // handle invalid/out of range endianness values
1414 if (elf_head.e_ident[EI_DATA] == 0 || elf_head.e_ident[EI_DATA] > 2) {
1415 return NULL;
1416 }
1417 change_endianness(elf_head.e_machine);
1418 }
1419
1420 typedef struct {
1421 Elf32_Half code; // Actual value as defined in elf.h
1422 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1423 unsigned char elf_class; // 32 or 64 bit
1424 unsigned char endianess; // MSB or LSB
1425 char* name; // String representation
1426 } arch_t;
1427
1428 #ifndef EM_AARCH64
1429 #define EM_AARCH64 183 /* ARM AARCH64 */
1430 #endif
1431
1432 static const arch_t arch_array[]={
1433 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1434 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1435 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1436 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1437 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1438 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1439 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1440 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1441 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1442 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
1443 // we only support 64 bit z architecture
1444 {EM_S390, EM_S390, ELFCLASS64, ELFDATA2MSB, (char*)"IBM System/390"},
1445 {EM_AARCH64, EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"}
1446 };
1447
1448 #if (defined IA32)
1449 static Elf32_Half running_arch_code=EM_386;
1450 #elif (defined AMD64)
1451 static Elf32_Half running_arch_code=EM_X86_64;
1452 #elif (defined IA64)
1453 static Elf32_Half running_arch_code=EM_IA_64;
1454 #elif (defined __sparc) && (defined _LP64)
1455 static Elf32_Half running_arch_code=EM_SPARCV9;
1456 #elif (defined __sparc) && (!defined _LP64)
1457 static Elf32_Half running_arch_code=EM_SPARC;
1458 #elif (defined __powerpc64__)
1459 static Elf32_Half running_arch_code=EM_PPC64;
1460 #elif (defined __powerpc__)
1461 static Elf32_Half running_arch_code=EM_PPC;
1462 #elif (defined ARM)
1463 static Elf32_Half running_arch_code=EM_ARM;
1464 #else
1465 #error Method os::dll_load requires that one of following is defined:\
1466 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1467 #endif
1468
1469 // Identify compatibility class for VM's architecture and library's architecture
1470 // Obtain string descriptions for architectures
1471
1472 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1473 int running_arch_index=-1;
1474
1475 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1476 if (running_arch_code == arch_array[i].code) {
1477 running_arch_index = i;
1478 }
1479 if (lib_arch.code == arch_array[i].code) {
1480 lib_arch.compat_class = arch_array[i].compat_class;
1481 lib_arch.name = arch_array[i].name;
1482 }
1483 }
1484
1485 assert(running_arch_index != -1,
1486 "Didn't find running architecture code (running_arch_code) in arch_array");
1487 if (running_arch_index == -1) {
1488 // Even though running architecture detection failed
1489 // we may still continue with reporting dlerror() message
1490 return NULL;
1491 }
1492
1493 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1494 if (lib_arch.name != NULL) {
1495 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1496 " (Possible cause: can't load %s .so on a %s platform)",
1497 lib_arch.name, arch_array[running_arch_index].name);
1498 } else {
1499 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1500 " (Possible cause: can't load this .so (machine code=0x%x) on a %s platform)",
1501 lib_arch.code, arch_array[running_arch_index].name);
1502 }
1503 return NULL;
1504 }
1505
1506 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1507 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1508 return NULL;
1509 }
1510
1511 // ELF file class/capacity : 0 - invalid, 1 - 32bit, 2 - 64bit
1512 if (lib_arch.elf_class > 2 || lib_arch.elf_class < 1) {
1513 ::snprintf(diag_msg_buf, diag_msg_max_length-1, " (Possible cause: invalid ELF file class)");
1514 return NULL;
1515 }
1516
1517 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1518 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1519 " (Possible cause: architecture word width mismatch, can't load %d-bit .so on a %d-bit platform)",
1520 (int) lib_arch.elf_class * 32, arch_array[running_arch_index].elf_class * 32);
1521 return NULL;
1522 }
1523
1524 return NULL;
1525 }
1526
1527 void* os::dll_lookup(void* handle, const char* name) {
1528 return dlsym(handle, name);
1529 }
1530
1531 void* os::get_default_process_handle() {
1532 return (void*)::dlopen(NULL, RTLD_LAZY);
1533 }
1534
1535 static inline time_t get_mtime(const char* filename) {
1536 struct stat st;
1537 int ret = os::stat(filename, &st);
1538 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
1539 return st.st_mtime;
1540 }
1541
1542 int os::compare_file_modified_times(const char* file1, const char* file2) {
1543 time_t t1 = get_mtime(file1);
1544 time_t t2 = get_mtime(file2);
1545 return t1 - t2;
1546 }
1547
1548 static bool _print_ascii_file(const char* filename, outputStream* st) {
1549 int fd = ::open(filename, O_RDONLY);
1550 if (fd == -1) {
1551 return false;
1552 }
1553
1554 char buf[32];
1555 int bytes;
1556 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1557 st->print_raw(buf, bytes);
1558 }
1559
1560 ::close(fd);
1561
1562 return true;
1563 }
1564
1565 void os::print_os_info_brief(outputStream* st) {
1566 os::Solaris::print_distro_info(st);
1567
1568 os::Posix::print_uname_info(st);
1569
1570 os::Solaris::print_libversion_info(st);
1571 }
1572
1573 void os::print_os_info(outputStream* st) {
1574 st->print("OS:");
1575
1576 os::Solaris::print_distro_info(st);
1577
1578 os::Posix::print_uname_info(st);
1579
1580 os::Posix::print_uptime_info(st);
1581
1582 os::Solaris::print_libversion_info(st);
1583
1584 os::Posix::print_rlimit_info(st);
1585
1586 os::Posix::print_load_average(st);
1587 }
1588
1589 void os::Solaris::print_distro_info(outputStream* st) {
1590 if (!_print_ascii_file("/etc/release", st)) {
1591 st->print("Solaris");
1592 }
1593 st->cr();
1594 }
1595
1596 void os::get_summary_os_info(char* buf, size_t buflen) {
1597 strncpy(buf, "Solaris", buflen); // default to plain solaris
1598 FILE* fp = fopen("/etc/release", "r");
1599 if (fp != NULL) {
1600 char tmp[256];
1601 // Only get the first line and chop out everything but the os name.
1602 if (fgets(tmp, sizeof(tmp), fp)) {
1603 char* ptr = tmp;
1604 // skip past whitespace characters
1605 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1606 if (*ptr != '\0') {
1607 char* nl = strchr(ptr, '\n');
1608 if (nl != NULL) *nl = '\0';
1609 strncpy(buf, ptr, buflen);
1610 }
1611 }
1612 fclose(fp);
1613 }
1614 }
1615
1616 void os::Solaris::print_libversion_info(outputStream* st) {
1617 st->print(" (T2 libthread)");
1618 st->cr();
1619 }
1620
1621 static bool check_addr0(outputStream* st) {
1622 jboolean status = false;
1623 const int read_chunk = 200;
1624 int ret = 0;
1625 int nmap = 0;
1626 int fd = ::open("/proc/self/map",O_RDONLY);
1627 if (fd >= 0) {
1628 prmap_t *p = NULL;
1629 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1630 if (NULL == mbuff) {
1631 ::close(fd);
1632 return status;
1633 }
1634 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1635 //check if read() has not read partial data
1636 if( 0 != ret % sizeof(prmap_t)){
1637 break;
1638 }
1639 nmap = ret / sizeof(prmap_t);
1640 p = (prmap_t *)mbuff;
1641 for(int i = 0; i < nmap; i++){
1642 if (p->pr_vaddr == 0x0) {
1643 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1644 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1645 st->print("Access: ");
1646 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1647 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1648 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1649 st->cr();
1650 status = true;
1651 }
1652 p++;
1653 }
1654 }
1655 free(mbuff);
1656 ::close(fd);
1657 }
1658 return status;
1659 }
1660
1661 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1662 // Get MHz with system call. We don't seem to already have this.
1663 processor_info_t stats;
1664 processorid_t id = getcpuid();
1665 int clock = 0;
1666 if (processor_info(id, &stats) != -1) {
1667 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1668 }
1669 #ifdef AMD64
1670 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1671 #else
1672 // must be sparc
1673 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1674 #endif
1675 }
1676
1677 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1678 // Nothing to do for now.
1679 }
1680
1681 void os::print_memory_info(outputStream* st) {
1682 st->print("Memory:");
1683 st->print(" %dk page", os::vm_page_size()>>10);
1684 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1685 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1686 st->cr();
1687 (void) check_addr0(st);
1688 }
1689
1690 // Moved from whole group, because we need them here for diagnostic
1691 // prints.
1692 static int Maxsignum = 0;
1693 static int *ourSigFlags = NULL;
1694
1695 int os::Solaris::get_our_sigflags(int sig) {
1696 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1697 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1698 return ourSigFlags[sig];
1699 }
1700
1701 void os::Solaris::set_our_sigflags(int sig, int flags) {
1702 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1703 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1704 ourSigFlags[sig] = flags;
1705 }
1706
1707
1708 static const char* get_signal_handler_name(address handler,
1709 char* buf, int buflen) {
1710 int offset;
1711 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1712 if (found) {
1713 // skip directory names
1714 const char *p1, *p2;
1715 p1 = buf;
1716 size_t len = strlen(os::file_separator());
1717 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1718 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1719 } else {
1720 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1721 }
1722 return buf;
1723 }
1724
1725 static void print_signal_handler(outputStream* st, int sig,
1726 char* buf, size_t buflen) {
1727 struct sigaction sa;
1728
1729 sigaction(sig, NULL, &sa);
1730
1731 st->print("%s: ", os::exception_name(sig, buf, buflen));
1732
1733 address handler = (sa.sa_flags & SA_SIGINFO)
1734 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1735 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1736
1737 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1738 st->print("SIG_DFL");
1739 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1740 st->print("SIG_IGN");
1741 } else {
1742 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1743 }
1744
1745 st->print(", sa_mask[0]=");
1746 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1747
1748 address rh = VMError::get_resetted_sighandler(sig);
1749 // May be, handler was resetted by VMError?
1750 if (rh != NULL) {
1751 handler = rh;
1752 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1753 }
1754
1755 st->print(", sa_flags=");
1756 os::Posix::print_sa_flags(st, sa.sa_flags);
1757
1758 // Check: is it our handler?
1759 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1760 // It is our signal handler
1761 // check for flags
1762 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1763 st->print(
1764 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1765 os::Solaris::get_our_sigflags(sig));
1766 }
1767 }
1768 st->cr();
1769 }
1770
1771 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1772 st->print_cr("Signal Handlers:");
1773 print_signal_handler(st, SIGSEGV, buf, buflen);
1774 print_signal_handler(st, SIGBUS , buf, buflen);
1775 print_signal_handler(st, SIGFPE , buf, buflen);
1776 print_signal_handler(st, SIGPIPE, buf, buflen);
1777 print_signal_handler(st, SIGXFSZ, buf, buflen);
1778 print_signal_handler(st, SIGILL , buf, buflen);
1779 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1780 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1781 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1782 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1783 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1784 }
1785
1786 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1787
1788 // Find the full path to the current module, libjvm.so
1789 void os::jvm_path(char *buf, jint buflen) {
1790 // Error checking.
1791 if (buflen < MAXPATHLEN) {
1792 assert(false, "must use a large-enough buffer");
1793 buf[0] = '\0';
1794 return;
1795 }
1796 // Lazy resolve the path to current module.
1797 if (saved_jvm_path[0] != 0) {
1798 strcpy(buf, saved_jvm_path);
1799 return;
1800 }
1801
1802 Dl_info dlinfo;
1803 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1804 assert(ret != 0, "cannot locate libjvm");
1805 if (ret != 0 && dlinfo.dli_fname != NULL) {
1806 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1807 return;
1808 }
1809 } else {
1810 buf[0] = '\0';
1811 return;
1812 }
1813
1814 if (Arguments::sun_java_launcher_is_altjvm()) {
1815 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1816 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
1817 // If "/jre/lib/" appears at the right place in the string, then
1818 // assume we are installed in a JDK and we're done. Otherwise, check
1819 // for a JAVA_HOME environment variable and fix up the path so it
1820 // looks like libjvm.so is installed there (append a fake suffix
1821 // hotspot/libjvm.so).
1822 const char *p = buf + strlen(buf) - 1;
1823 for (int count = 0; p > buf && count < 5; ++count) {
1824 for (--p; p > buf && *p != '/'; --p)
1825 /* empty */ ;
1826 }
1827
1828 if (strncmp(p, "/jre/lib/", 9) != 0) {
1829 // Look for JAVA_HOME in the environment.
1830 char* java_home_var = ::getenv("JAVA_HOME");
1831 if (java_home_var != NULL && java_home_var[0] != 0) {
1832 char* jrelib_p;
1833 int len;
1834
1835 // Check the current module name "libjvm.so".
1836 p = strrchr(buf, '/');
1837 assert(strstr(p, "/libjvm") == p, "invalid library name");
1838
1839 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
1840 return;
1841 }
1842 // determine if this is a legacy image or modules image
1843 // modules image doesn't have "jre" subdirectory
1844 len = strlen(buf);
1845 assert(len < buflen, "Ran out of buffer space");
1846 jrelib_p = buf + len;
1847 snprintf(jrelib_p, buflen-len, "/jre/lib");
1848 if (0 != access(buf, F_OK)) {
1849 snprintf(jrelib_p, buflen-len, "/lib");
1850 }
1851
1852 if (0 == access(buf, F_OK)) {
1853 // Use current module name "libjvm.so"
1854 len = strlen(buf);
1855 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1856 } else {
1857 // Go back to path of .so
1858 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
1859 return;
1860 }
1861 }
1862 }
1863 }
1864 }
1865
1866 strncpy(saved_jvm_path, buf, MAXPATHLEN);
1867 saved_jvm_path[MAXPATHLEN - 1] = '\0';
1868 }
1869
1870
1871 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1872 // no prefix required, not even "_"
1873 }
1874
1875
1876 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1877 // no suffix required
1878 }
1879
1880 // sun.misc.Signal
1881
1882 extern "C" {
1883 static void UserHandler(int sig, void *siginfo, void *context) {
1884 // Ctrl-C is pressed during error reporting, likely because the error
1885 // handler fails to abort. Let VM die immediately.
1886 if (sig == SIGINT && VMError::is_error_reported()) {
1887 os::die();
1888 }
1889
1890 os::signal_notify(sig);
1891 // We do not need to reinstate the signal handler each time...
1892 }
1893 }
1894
1895 void* os::user_handler() {
1896 return CAST_FROM_FN_PTR(void*, UserHandler);
1897 }
1898
1899 extern "C" {
1900 typedef void (*sa_handler_t)(int);
1901 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1902 }
1903
1904 void* os::signal(int signal_number, void* handler) {
1905 struct sigaction sigAct, oldSigAct;
1906 sigfillset(&(sigAct.sa_mask));
1907 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
1908 sigAct.sa_flags |= SA_SIGINFO;
1909 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1910
1911 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1912 // -1 means registration failed
1913 return (void *)-1;
1914 }
1915
1916 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1917 }
1918
1919 void os::signal_raise(int signal_number) {
1920 raise(signal_number);
1921 }
1922
1923 // The following code is moved from os.cpp for making this
1924 // code platform specific, which it is by its very nature.
1925
1926 // a counter for each possible signal value
1927 static int Sigexit = 0;
1928 static jint *pending_signals = NULL;
1929 static int *preinstalled_sigs = NULL;
1930 static struct sigaction *chainedsigactions = NULL;
1931 static Semaphore* sig_sem = NULL;
1932
1933 int os::sigexitnum_pd() {
1934 assert(Sigexit > 0, "signal memory not yet initialized");
1935 return Sigexit;
1936 }
1937
1938 void os::Solaris::init_signal_mem() {
1939 // Initialize signal structures
1940 Maxsignum = SIGRTMAX;
1941 Sigexit = Maxsignum+1;
1942 assert(Maxsignum >0, "Unable to obtain max signal number");
1943
1944 // Initialize signal structures
1945 // pending_signals has one int per signal
1946 // The additional signal is for SIGEXIT - exit signal to signal_thread
1947 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
1948 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
1949
1950 if (UseSignalChaining) {
1951 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
1952 * (Maxsignum + 1), mtInternal);
1953 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
1954 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
1955 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
1956 }
1957 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
1958 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
1959 }
1960
1961 static void jdk_misc_signal_init() {
1962 // Initialize signal semaphore
1963 sig_sem = new Semaphore();
1964 }
1965
1966 void os::signal_notify(int sig) {
1967 if (sig_sem != NULL) {
1968 Atomic::inc(&pending_signals[sig]);
1969 sig_sem->signal();
1970 } else {
1971 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init
1972 // initialization isn't called.
1973 assert(ReduceSignalUsage, "signal semaphore should be created");
1974 }
1975 }
1976
1977 static int check_pending_signals() {
1978 int ret;
1979 while (true) {
1980 for (int i = 0; i < Sigexit + 1; i++) {
1981 jint n = pending_signals[i];
1982 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1983 return i;
1984 }
1985 }
1986 JavaThread *thread = JavaThread::current();
1987 ThreadBlockInVM tbivm(thread);
1988
1989 bool threadIsSuspended;
1990 do {
1991 thread->set_suspend_equivalent();
1992 sig_sem->wait();
1993
1994 // were we externally suspended while we were waiting?
1995 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1996 if (threadIsSuspended) {
1997 // The semaphore has been incremented, but while we were waiting
1998 // another thread suspended us. We don't want to continue running
1999 // while suspended because that would surprise the thread that
2000 // suspended us.
2001 sig_sem->signal();
2002
2003 thread->java_suspend_self();
2004 }
2005 } while (threadIsSuspended);
2006 }
2007 }
2008
2009 int os::signal_wait() {
2010 return check_pending_signals();
2011 }
2012
2013 ////////////////////////////////////////////////////////////////////////////////
2014 // Virtual Memory
2015
2016 static int page_size = -1;
2017
2018 int os::vm_page_size() {
2019 assert(page_size != -1, "must call os::init");
2020 return page_size;
2021 }
2022
2023 // Solaris allocates memory by pages.
2024 int os::vm_allocation_granularity() {
2025 assert(page_size != -1, "must call os::init");
2026 return page_size;
2027 }
2028
2029 static bool recoverable_mmap_error(int err) {
2030 // See if the error is one we can let the caller handle. This
2031 // list of errno values comes from the Solaris mmap(2) man page.
2032 switch (err) {
2033 case EBADF:
2034 case EINVAL:
2035 case ENOTSUP:
2036 // let the caller deal with these errors
2037 return true;
2038
2039 default:
2040 // Any remaining errors on this OS can cause our reserved mapping
2041 // to be lost. That can cause confusion where different data
2042 // structures think they have the same memory mapped. The worst
2043 // scenario is if both the VM and a library think they have the
2044 // same memory mapped.
2045 return false;
2046 }
2047 }
2048
2049 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2050 int err) {
2051 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2052 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2053 os::strerror(err), err);
2054 }
2055
2056 static void warn_fail_commit_memory(char* addr, size_t bytes,
2057 size_t alignment_hint, bool exec,
2058 int err) {
2059 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2060 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2061 alignment_hint, exec, os::strerror(err), err);
2062 }
2063
2064 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2065 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2066 size_t size = bytes;
2067 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2068 if (res != NULL) {
2069 if (UseNUMAInterleaving) {
2070 numa_make_global(addr, bytes);
2071 }
2072 return 0;
2073 }
2074
2075 int err = errno; // save errno from mmap() call in mmap_chunk()
2076
2077 if (!recoverable_mmap_error(err)) {
2078 warn_fail_commit_memory(addr, bytes, exec, err);
2079 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2080 }
2081
2082 return err;
2083 }
2084
2085 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2086 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2087 }
2088
2089 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2090 const char* mesg) {
2091 assert(mesg != NULL, "mesg must be specified");
2092 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2093 if (err != 0) {
2094 // the caller wants all commit errors to exit with the specified mesg:
2095 warn_fail_commit_memory(addr, bytes, exec, err);
2096 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2097 }
2098 }
2099
2100 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2101 assert(is_aligned(alignment, (size_t) vm_page_size()),
2102 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2103 alignment, (size_t) vm_page_size());
2104
2105 for (int i = 0; _page_sizes[i] != 0; i++) {
2106 if (is_aligned(alignment, _page_sizes[i])) {
2107 return _page_sizes[i];
2108 }
2109 }
2110
2111 return (size_t) vm_page_size();
2112 }
2113
2114 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2115 size_t alignment_hint, bool exec) {
2116 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2117 if (err == 0 && UseLargePages && alignment_hint > 0) {
2118 assert(is_aligned(bytes, alignment_hint),
2119 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2120
2121 // The syscall memcntl requires an exact page size (see man memcntl for details).
2122 size_t page_size = page_size_for_alignment(alignment_hint);
2123 if (page_size > (size_t) vm_page_size()) {
2124 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2125 }
2126 }
2127 return err;
2128 }
2129
2130 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2131 bool exec) {
2132 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2133 }
2134
2135 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2136 size_t alignment_hint, bool exec,
2137 const char* mesg) {
2138 assert(mesg != NULL, "mesg must be specified");
2139 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2140 if (err != 0) {
2141 // the caller wants all commit errors to exit with the specified mesg:
2142 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2143 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2144 }
2145 }
2146
2147 // Uncommit the pages in a specified region.
2148 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2149 if (madvise(addr, bytes, MADV_FREE) < 0) {
2150 debug_only(warning("MADV_FREE failed."));
2151 return;
2152 }
2153 }
2154
2155 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2156 return os::commit_memory(addr, size, !ExecMem);
2157 }
2158
2159 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2160 return os::uncommit_memory(addr, size);
2161 }
2162
2163 // Change the page size in a given range.
2164 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2165 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2166 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2167 if (UseLargePages) {
2168 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2169 if (page_size > (size_t) vm_page_size()) {
2170 Solaris::setup_large_pages(addr, bytes, page_size);
2171 }
2172 }
2173 }
2174
2175 // Tell the OS to make the range local to the first-touching LWP
2176 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2177 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2178 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2179 debug_only(warning("MADV_ACCESS_LWP failed."));
2180 }
2181 }
2182
2183 // Tell the OS that this range would be accessed from different LWPs.
2184 void os::numa_make_global(char *addr, size_t bytes) {
2185 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2186 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2187 debug_only(warning("MADV_ACCESS_MANY failed."));
2188 }
2189 }
2190
2191 // Get the number of the locality groups.
2192 size_t os::numa_get_groups_num() {
2193 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2194 return n != -1 ? n : 1;
2195 }
2196
2197 // Get a list of leaf locality groups. A leaf lgroup is group that
2198 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2199 // board. An LWP is assigned to one of these groups upon creation.
2200 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2201 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2202 ids[0] = 0;
2203 return 1;
2204 }
2205 int result_size = 0, top = 1, bottom = 0, cur = 0;
2206 for (int k = 0; k < size; k++) {
2207 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2208 (Solaris::lgrp_id_t*)&ids[top], size - top);
2209 if (r == -1) {
2210 ids[0] = 0;
2211 return 1;
2212 }
2213 if (!r) {
2214 // That's a leaf node.
2215 assert(bottom <= cur, "Sanity check");
2216 // Check if the node has memory
2217 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2218 NULL, 0, LGRP_RSRC_MEM) > 0) {
2219 ids[bottom++] = ids[cur];
2220 }
2221 }
2222 top += r;
2223 cur++;
2224 }
2225 if (bottom == 0) {
2226 // Handle a situation, when the OS reports no memory available.
2227 // Assume UMA architecture.
2228 ids[0] = 0;
2229 return 1;
2230 }
2231 return bottom;
2232 }
2233
2234 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2235 bool os::numa_topology_changed() {
2236 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2237 if (is_stale != -1 && is_stale) {
2238 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2239 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2240 assert(c != 0, "Failure to initialize LGRP API");
2241 Solaris::set_lgrp_cookie(c);
2242 return true;
2243 }
2244 return false;
2245 }
2246
2247 // Get the group id of the current LWP.
2248 int os::numa_get_group_id() {
2249 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2250 if (lgrp_id == -1) {
2251 return 0;
2252 }
2253 const int size = os::numa_get_groups_num();
2254 int *ids = (int*)alloca(size * sizeof(int));
2255
2256 // Get the ids of all lgroups with memory; r is the count.
2257 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2258 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2259 if (r <= 0) {
2260 return 0;
2261 }
2262 return ids[os::random() % r];
2263 }
2264
2265 int os::numa_get_group_id_for_address(const void* address) {
2266 return 0;
2267 }
2268
2269 // Request information about the page.
2270 bool os::get_page_info(char *start, page_info* info) {
2271 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2272 uint64_t addr = (uintptr_t)start;
2273 uint64_t outdata[2];
2274 uint_t validity = 0;
2275
2276 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2277 return false;
2278 }
2279
2280 info->size = 0;
2281 info->lgrp_id = -1;
2282
2283 if ((validity & 1) != 0) {
2284 if ((validity & 2) != 0) {
2285 info->lgrp_id = outdata[0];
2286 }
2287 if ((validity & 4) != 0) {
2288 info->size = outdata[1];
2289 }
2290 return true;
2291 }
2292 return false;
2293 }
2294
2295 // Scan the pages from start to end until a page different than
2296 // the one described in the info parameter is encountered.
2297 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2298 page_info* page_found) {
2299 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2300 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2301 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2302 uint_t validity[MAX_MEMINFO_CNT];
2303
2304 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2305 uint64_t p = (uint64_t)start;
2306 while (p < (uint64_t)end) {
2307 addrs[0] = p;
2308 size_t addrs_count = 1;
2309 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2310 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2311 addrs_count++;
2312 }
2313
2314 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2315 return NULL;
2316 }
2317
2318 size_t i = 0;
2319 for (; i < addrs_count; i++) {
2320 if ((validity[i] & 1) != 0) {
2321 if ((validity[i] & 4) != 0) {
2322 if (outdata[types * i + 1] != page_expected->size) {
2323 break;
2324 }
2325 } else if (page_expected->size != 0) {
2326 break;
2327 }
2328
2329 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2330 if (outdata[types * i] != page_expected->lgrp_id) {
2331 break;
2332 }
2333 }
2334 } else {
2335 return NULL;
2336 }
2337 }
2338
2339 if (i < addrs_count) {
2340 if ((validity[i] & 2) != 0) {
2341 page_found->lgrp_id = outdata[types * i];
2342 } else {
2343 page_found->lgrp_id = -1;
2344 }
2345 if ((validity[i] & 4) != 0) {
2346 page_found->size = outdata[types * i + 1];
2347 } else {
2348 page_found->size = 0;
2349 }
2350 return (char*)addrs[i];
2351 }
2352
2353 p = addrs[addrs_count - 1] + page_size;
2354 }
2355 return end;
2356 }
2357
2358 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2359 size_t size = bytes;
2360 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2361 // uncommitted page. Otherwise, the read/write might succeed if we
2362 // have enough swap space to back the physical page.
2363 return
2364 NULL != Solaris::mmap_chunk(addr, size,
2365 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2366 PROT_NONE);
2367 }
2368
2369 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2370 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2371
2372 if (b == MAP_FAILED) {
2373 return NULL;
2374 }
2375 return b;
2376 }
2377
2378 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2379 size_t alignment_hint, bool fixed) {
2380 char* addr = requested_addr;
2381 int flags = MAP_PRIVATE | MAP_NORESERVE;
2382
2383 assert(!(fixed && (alignment_hint > 0)),
2384 "alignment hint meaningless with fixed mmap");
2385
2386 if (fixed) {
2387 flags |= MAP_FIXED;
2388 } else if (alignment_hint > (size_t) vm_page_size()) {
2389 flags |= MAP_ALIGN;
2390 addr = (char*) alignment_hint;
2391 }
2392
2393 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2394 // uncommitted page. Otherwise, the read/write might succeed if we
2395 // have enough swap space to back the physical page.
2396 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2397 }
2398
2399 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2400 size_t alignment_hint) {
2401 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2402 (requested_addr != NULL));
2403
2404 guarantee(requested_addr == NULL || requested_addr == addr,
2405 "OS failed to return requested mmap address.");
2406 return addr;
2407 }
2408
2409 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2410 assert(file_desc >= 0, "file_desc is not valid");
2411 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
2412 if (result != NULL) {
2413 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2414 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2415 }
2416 }
2417 return result;
2418 }
2419
2420 // Reserve memory at an arbitrary address, only if that area is
2421 // available (and not reserved for something else).
2422
2423 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2424 // Assert only that the size is a multiple of the page size, since
2425 // that's all that mmap requires, and since that's all we really know
2426 // about at this low abstraction level. If we need higher alignment,
2427 // we can either pass an alignment to this method or verify alignment
2428 // in one of the methods further up the call chain. See bug 5044738.
2429 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2430
2431 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2432 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2433
2434 volatile int err = errno;
2435 if (addr == requested_addr) {
2436 return addr;
2437 }
2438
2439 if (addr != NULL) {
2440 pd_unmap_memory(addr, bytes);
2441 }
2442
2443 return NULL;
2444 }
2445
2446 bool os::pd_release_memory(char* addr, size_t bytes) {
2447 size_t size = bytes;
2448 return munmap(addr, size) == 0;
2449 }
2450
2451 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2452 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()),
2453 "addr must be page aligned");
2454 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot);
2455 int retVal = mprotect(addr, bytes, prot);
2456 return retVal == 0;
2457 }
2458
2459 // Protect memory (Used to pass readonly pages through
2460 // JNI GetArray<type>Elements with empty arrays.)
2461 // Also, used for serialization page and for compressed oops null pointer
2462 // checking.
2463 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2464 bool is_committed) {
2465 unsigned int p = 0;
2466 switch (prot) {
2467 case MEM_PROT_NONE: p = PROT_NONE; break;
2468 case MEM_PROT_READ: p = PROT_READ; break;
2469 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2470 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2471 default:
2472 ShouldNotReachHere();
2473 }
2474 // is_committed is unused.
2475 return solaris_mprotect(addr, bytes, p);
2476 }
2477
2478 // guard_memory and unguard_memory only happens within stack guard pages.
2479 // Since ISM pertains only to the heap, guard and unguard memory should not
2480 /// happen with an ISM region.
2481 bool os::guard_memory(char* addr, size_t bytes) {
2482 return solaris_mprotect(addr, bytes, PROT_NONE);
2483 }
2484
2485 bool os::unguard_memory(char* addr, size_t bytes) {
2486 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2487 }
2488
2489 // Large page support
2490 static size_t _large_page_size = 0;
2491
2492 // Insertion sort for small arrays (descending order).
2493 static void insertion_sort_descending(size_t* array, int len) {
2494 for (int i = 0; i < len; i++) {
2495 size_t val = array[i];
2496 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2497 size_t tmp = array[key];
2498 array[key] = array[key - 1];
2499 array[key - 1] = tmp;
2500 }
2501 }
2502 }
2503
2504 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2505 const unsigned int usable_count = VM_Version::page_size_count();
2506 if (usable_count == 1) {
2507 return false;
2508 }
2509
2510 // Find the right getpagesizes interface. When solaris 11 is the minimum
2511 // build platform, getpagesizes() (without the '2') can be called directly.
2512 typedef int (*gps_t)(size_t[], int);
2513 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2514 if (gps_func == NULL) {
2515 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2516 if (gps_func == NULL) {
2517 if (warn) {
2518 warning("MPSS is not supported by the operating system.");
2519 }
2520 return false;
2521 }
2522 }
2523
2524 // Fill the array of page sizes.
2525 int n = (*gps_func)(_page_sizes, page_sizes_max);
2526 assert(n > 0, "Solaris bug?");
2527
2528 if (n == page_sizes_max) {
2529 // Add a sentinel value (necessary only if the array was completely filled
2530 // since it is static (zeroed at initialization)).
2531 _page_sizes[--n] = 0;
2532 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2533 }
2534 assert(_page_sizes[n] == 0, "missing sentinel");
2535 trace_page_sizes("available page sizes", _page_sizes, n);
2536
2537 if (n == 1) return false; // Only one page size available.
2538
2539 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2540 // select up to usable_count elements. First sort the array, find the first
2541 // acceptable value, then copy the usable sizes to the top of the array and
2542 // trim the rest. Make sure to include the default page size :-).
2543 //
2544 // A better policy could get rid of the 4M limit by taking the sizes of the
2545 // important VM memory regions (java heap and possibly the code cache) into
2546 // account.
2547 insertion_sort_descending(_page_sizes, n);
2548 const size_t size_limit =
2549 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2550 int beg;
2551 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2552 const int end = MIN2((int)usable_count, n) - 1;
2553 for (int cur = 0; cur < end; ++cur, ++beg) {
2554 _page_sizes[cur] = _page_sizes[beg];
2555 }
2556 _page_sizes[end] = vm_page_size();
2557 _page_sizes[end + 1] = 0;
2558
2559 if (_page_sizes[end] > _page_sizes[end - 1]) {
2560 // Default page size is not the smallest; sort again.
2561 insertion_sort_descending(_page_sizes, end + 1);
2562 }
2563 *page_size = _page_sizes[0];
2564
2565 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2566 return true;
2567 }
2568
2569 void os::large_page_init() {
2570 if (UseLargePages) {
2571 // print a warning if any large page related flag is specified on command line
2572 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2573 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2574
2575 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2576 }
2577 }
2578
2579 bool os::Solaris::is_valid_page_size(size_t bytes) {
2580 for (int i = 0; _page_sizes[i] != 0; i++) {
2581 if (_page_sizes[i] == bytes) {
2582 return true;
2583 }
2584 }
2585 return false;
2586 }
2587
2588 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2589 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2590 assert(is_aligned((void*) start, align),
2591 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2592 assert(is_aligned(bytes, align),
2593 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2594
2595 // Signal to OS that we want large pages for addresses
2596 // from addr, addr + bytes
2597 struct memcntl_mha mpss_struct;
2598 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2599 mpss_struct.mha_pagesize = align;
2600 mpss_struct.mha_flags = 0;
2601 // Upon successful completion, memcntl() returns 0
2602 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2603 debug_only(warning("Attempt to use MPSS failed."));
2604 return false;
2605 }
2606 return true;
2607 }
2608
2609 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2610 fatal("os::reserve_memory_special should not be called on Solaris.");
2611 return NULL;
2612 }
2613
2614 bool os::release_memory_special(char* base, size_t bytes) {
2615 fatal("os::release_memory_special should not be called on Solaris.");
2616 return false;
2617 }
2618
2619 size_t os::large_page_size() {
2620 return _large_page_size;
2621 }
2622
2623 // MPSS allows application to commit large page memory on demand; with ISM
2624 // the entire memory region must be allocated as shared memory.
2625 bool os::can_commit_large_page_memory() {
2626 return true;
2627 }
2628
2629 bool os::can_execute_large_page_memory() {
2630 return true;
2631 }
2632
2633 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2634 void os::infinite_sleep() {
2635 while (true) { // sleep forever ...
2636 ::sleep(100); // ... 100 seconds at a time
2637 }
2638 }
2639
2640 // Used to convert frequent JVM_Yield() to nops
2641 bool os::dont_yield() {
2642 if (DontYieldALot) {
2643 static hrtime_t last_time = 0;
2644 hrtime_t diff = getTimeNanos() - last_time;
2645
2646 if (diff < DontYieldALotInterval * 1000000) {
2647 return true;
2648 }
2649
2650 last_time += diff;
2651
2652 return false;
2653 } else {
2654 return false;
2655 }
2656 }
2657
2658 // Note that yield semantics are defined by the scheduling class to which
2659 // the thread currently belongs. Typically, yield will _not yield to
2660 // other equal or higher priority threads that reside on the dispatch queues
2661 // of other CPUs.
2662
2663 void os::naked_yield() {
2664 thr_yield();
2665 }
2666
2667 // Interface for setting lwp priorities. We are using T2 libthread,
2668 // which forces the use of bound threads, so all of our threads will
2669 // be assigned to real lwp's. Using the thr_setprio function is
2670 // meaningless in this mode so we must adjust the real lwp's priority.
2671 // The routines below implement the getting and setting of lwp priorities.
2672 //
2673 // Note: There are three priority scales used on Solaris. Java priotities
2674 // which range from 1 to 10, libthread "thr_setprio" scale which range
2675 // from 0 to 127, and the current scheduling class of the process we
2676 // are running in. This is typically from -60 to +60.
2677 // The setting of the lwp priorities in done after a call to thr_setprio
2678 // so Java priorities are mapped to libthread priorities and we map from
2679 // the latter to lwp priorities. We don't keep priorities stored in
2680 // Java priorities since some of our worker threads want to set priorities
2681 // higher than all Java threads.
2682 //
2683 // For related information:
2684 // (1) man -s 2 priocntl
2685 // (2) man -s 4 priocntl
2686 // (3) man dispadmin
2687 // = librt.so
2688 // = libthread/common/rtsched.c - thrp_setlwpprio().
2689 // = ps -cL <pid> ... to validate priority.
2690 // = sched_get_priority_min and _max
2691 // pthread_create
2692 // sched_setparam
2693 // pthread_setschedparam
2694 //
2695 // Assumptions:
2696 // + We assume that all threads in the process belong to the same
2697 // scheduling class. IE. an homogenous process.
2698 // + Must be root or in IA group to change change "interactive" attribute.
2699 // Priocntl() will fail silently. The only indication of failure is when
2700 // we read-back the value and notice that it hasn't changed.
2701 // + Interactive threads enter the runq at the head, non-interactive at the tail.
2702 // + For RT, change timeslice as well. Invariant:
2703 // constant "priority integral"
2704 // Konst == TimeSlice * (60-Priority)
2705 // Given a priority, compute appropriate timeslice.
2706 // + Higher numerical values have higher priority.
2707
2708 // sched class attributes
2709 typedef struct {
2710 int schedPolicy; // classID
2711 int maxPrio;
2712 int minPrio;
2713 } SchedInfo;
2714
2715
2716 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
2717
2718 #ifdef ASSERT
2719 static int ReadBackValidate = 1;
2720 #endif
2721 static int myClass = 0;
2722 static int myMin = 0;
2723 static int myMax = 0;
2724 static int myCur = 0;
2725 static bool priocntl_enable = false;
2726
2727 static const int criticalPrio = FXCriticalPriority;
2728 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
2729
2730
2731 // lwp_priocntl_init
2732 //
2733 // Try to determine the priority scale for our process.
2734 //
2735 // Return errno or 0 if OK.
2736 //
2737 static int lwp_priocntl_init() {
2738 int rslt;
2739 pcinfo_t ClassInfo;
2740 pcparms_t ParmInfo;
2741 int i;
2742
2743 if (!UseThreadPriorities) return 0;
2744
2745 // If ThreadPriorityPolicy is 1, switch tables
2746 if (ThreadPriorityPolicy == 1) {
2747 for (i = 0; i < CriticalPriority+1; i++)
2748 os::java_to_os_priority[i] = prio_policy1[i];
2749 }
2750 if (UseCriticalJavaThreadPriority) {
2751 // MaxPriority always maps to the FX scheduling class and criticalPrio.
2752 // See set_native_priority() and set_lwp_class_and_priority().
2753 // Save original MaxPriority mapping in case attempt to
2754 // use critical priority fails.
2755 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
2756 // Set negative to distinguish from other priorities
2757 os::java_to_os_priority[MaxPriority] = -criticalPrio;
2758 }
2759
2760 // Get IDs for a set of well-known scheduling classes.
2761 // TODO-FIXME: GETCLINFO returns the current # of classes in the
2762 // the system. We should have a loop that iterates over the
2763 // classID values, which are known to be "small" integers.
2764
2765 strcpy(ClassInfo.pc_clname, "TS");
2766 ClassInfo.pc_cid = -1;
2767 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2768 if (rslt < 0) return errno;
2769 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
2770 tsLimits.schedPolicy = ClassInfo.pc_cid;
2771 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
2772 tsLimits.minPrio = -tsLimits.maxPrio;
2773
2774 strcpy(ClassInfo.pc_clname, "IA");
2775 ClassInfo.pc_cid = -1;
2776 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2777 if (rslt < 0) return errno;
2778 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
2779 iaLimits.schedPolicy = ClassInfo.pc_cid;
2780 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
2781 iaLimits.minPrio = -iaLimits.maxPrio;
2782
2783 strcpy(ClassInfo.pc_clname, "RT");
2784 ClassInfo.pc_cid = -1;
2785 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2786 if (rslt < 0) return errno;
2787 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
2788 rtLimits.schedPolicy = ClassInfo.pc_cid;
2789 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
2790 rtLimits.minPrio = 0;
2791
2792 strcpy(ClassInfo.pc_clname, "FX");
2793 ClassInfo.pc_cid = -1;
2794 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
2795 if (rslt < 0) return errno;
2796 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
2797 fxLimits.schedPolicy = ClassInfo.pc_cid;
2798 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
2799 fxLimits.minPrio = 0;
2800
2801 // Query our "current" scheduling class.
2802 // This will normally be IA, TS or, rarely, FX or RT.
2803 memset(&ParmInfo, 0, sizeof(ParmInfo));
2804 ParmInfo.pc_cid = PC_CLNULL;
2805 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
2806 if (rslt < 0) return errno;
2807 myClass = ParmInfo.pc_cid;
2808
2809 // We now know our scheduling classId, get specific information
2810 // about the class.
2811 ClassInfo.pc_cid = myClass;
2812 ClassInfo.pc_clname[0] = 0;
2813 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
2814 if (rslt < 0) return errno;
2815
2816 if (ThreadPriorityVerbose) {
2817 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
2818 }
2819
2820 memset(&ParmInfo, 0, sizeof(pcparms_t));
2821 ParmInfo.pc_cid = PC_CLNULL;
2822 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
2823 if (rslt < 0) return errno;
2824
2825 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
2826 myMin = rtLimits.minPrio;
2827 myMax = rtLimits.maxPrio;
2828 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
2829 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
2830 myMin = iaLimits.minPrio;
2831 myMax = iaLimits.maxPrio;
2832 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
2833 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
2834 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
2835 myMin = tsLimits.minPrio;
2836 myMax = tsLimits.maxPrio;
2837 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
2838 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
2839 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
2840 myMin = fxLimits.minPrio;
2841 myMax = fxLimits.maxPrio;
2842 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
2843 } else {
2844 // No clue - punt
2845 if (ThreadPriorityVerbose) {
2846 tty->print_cr("Unknown scheduling class: %s ... \n",
2847 ClassInfo.pc_clname);
2848 }
2849 return EINVAL; // no clue, punt
2850 }
2851
2852 if (ThreadPriorityVerbose) {
2853 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
2854 }
2855
2856 priocntl_enable = true; // Enable changing priorities
2857 return 0;
2858 }
2859
2860 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
2861 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
2862 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
2863 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
2864
2865
2866 // scale_to_lwp_priority
2867 //
2868 // Convert from the libthread "thr_setprio" scale to our current
2869 // lwp scheduling class scale.
2870 //
2871 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
2872 int v;
2873
2874 if (x == 127) return rMax; // avoid round-down
2875 v = (((x*(rMax-rMin)))/128)+rMin;
2876 return v;
2877 }
2878
2879
2880 // set_lwp_class_and_priority
2881 int set_lwp_class_and_priority(int ThreadID, int lwpid,
2882 int newPrio, int new_class, bool scale) {
2883 int rslt;
2884 int Actual, Expected, prv;
2885 pcparms_t ParmInfo; // for GET-SET
2886 #ifdef ASSERT
2887 pcparms_t ReadBack; // for readback
2888 #endif
2889
2890 // Set priority via PC_GETPARMS, update, PC_SETPARMS
2891 // Query current values.
2892 // TODO: accelerate this by eliminating the PC_GETPARMS call.
2893 // Cache "pcparms_t" in global ParmCache.
2894 // TODO: elide set-to-same-value
2895
2896 // If something went wrong on init, don't change priorities.
2897 if (!priocntl_enable) {
2898 if (ThreadPriorityVerbose) {
2899 tty->print_cr("Trying to set priority but init failed, ignoring");
2900 }
2901 return EINVAL;
2902 }
2903
2904 // If lwp hasn't started yet, just return
2905 // the _start routine will call us again.
2906 if (lwpid <= 0) {
2907 if (ThreadPriorityVerbose) {
2908 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
2909 INTPTR_FORMAT " to %d, lwpid not set",
2910 ThreadID, newPrio);
2911 }
2912 return 0;
2913 }
2914
2915 if (ThreadPriorityVerbose) {
2916 tty->print_cr ("set_lwp_class_and_priority("
2917 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
2918 ThreadID, lwpid, newPrio);
2919 }
2920
2921 memset(&ParmInfo, 0, sizeof(pcparms_t));
2922 ParmInfo.pc_cid = PC_CLNULL;
2923 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
2924 if (rslt < 0) return errno;
2925
2926 int cur_class = ParmInfo.pc_cid;
2927 ParmInfo.pc_cid = (id_t)new_class;
2928
2929 if (new_class == rtLimits.schedPolicy) {
2930 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
2931 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
2932 rtLimits.maxPrio, newPrio)
2933 : newPrio;
2934 rtInfo->rt_tqsecs = RT_NOCHANGE;
2935 rtInfo->rt_tqnsecs = RT_NOCHANGE;
2936 if (ThreadPriorityVerbose) {
2937 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
2938 }
2939 } else if (new_class == iaLimits.schedPolicy) {
2940 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
2941 int maxClamped = MIN2(iaLimits.maxPrio,
2942 cur_class == new_class
2943 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
2944 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
2945 maxClamped, newPrio)
2946 : newPrio;
2947 iaInfo->ia_uprilim = cur_class == new_class
2948 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
2949 iaInfo->ia_mode = IA_NOCHANGE;
2950 if (ThreadPriorityVerbose) {
2951 tty->print_cr("IA: [%d...%d] %d->%d\n",
2952 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
2953 }
2954 } else if (new_class == tsLimits.schedPolicy) {
2955 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
2956 int maxClamped = MIN2(tsLimits.maxPrio,
2957 cur_class == new_class
2958 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
2959 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
2960 maxClamped, newPrio)
2961 : newPrio;
2962 tsInfo->ts_uprilim = cur_class == new_class
2963 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
2964 if (ThreadPriorityVerbose) {
2965 tty->print_cr("TS: [%d...%d] %d->%d\n",
2966 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
2967 }
2968 } else if (new_class == fxLimits.schedPolicy) {
2969 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
2970 int maxClamped = MIN2(fxLimits.maxPrio,
2971 cur_class == new_class
2972 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
2973 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
2974 maxClamped, newPrio)
2975 : newPrio;
2976 fxInfo->fx_uprilim = cur_class == new_class
2977 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
2978 fxInfo->fx_tqsecs = FX_NOCHANGE;
2979 fxInfo->fx_tqnsecs = FX_NOCHANGE;
2980 if (ThreadPriorityVerbose) {
2981 tty->print_cr("FX: [%d...%d] %d->%d\n",
2982 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
2983 }
2984 } else {
2985 if (ThreadPriorityVerbose) {
2986 tty->print_cr("Unknown new scheduling class %d\n", new_class);
2987 }
2988 return EINVAL; // no clue, punt
2989 }
2990
2991 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
2992 if (ThreadPriorityVerbose && rslt) {
2993 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
2994 }
2995 if (rslt < 0) return errno;
2996
2997 #ifdef ASSERT
2998 // Sanity check: read back what we just attempted to set.
2999 // In theory it could have changed in the interim ...
3000 //
3001 // The priocntl system call is tricky.
3002 // Sometimes it'll validate the priority value argument and
3003 // return EINVAL if unhappy. At other times it fails silently.
3004 // Readbacks are prudent.
3005
3006 if (!ReadBackValidate) return 0;
3007
3008 memset(&ReadBack, 0, sizeof(pcparms_t));
3009 ReadBack.pc_cid = PC_CLNULL;
3010 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3011 assert(rslt >= 0, "priocntl failed");
3012 Actual = Expected = 0xBAD;
3013 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3014 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3015 Actual = RTPRI(ReadBack)->rt_pri;
3016 Expected = RTPRI(ParmInfo)->rt_pri;
3017 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3018 Actual = IAPRI(ReadBack)->ia_upri;
3019 Expected = IAPRI(ParmInfo)->ia_upri;
3020 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3021 Actual = TSPRI(ReadBack)->ts_upri;
3022 Expected = TSPRI(ParmInfo)->ts_upri;
3023 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3024 Actual = FXPRI(ReadBack)->fx_upri;
3025 Expected = FXPRI(ParmInfo)->fx_upri;
3026 } else {
3027 if (ThreadPriorityVerbose) {
3028 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3029 ParmInfo.pc_cid);
3030 }
3031 }
3032
3033 if (Actual != Expected) {
3034 if (ThreadPriorityVerbose) {
3035 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3036 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3037 }
3038 }
3039 #endif
3040
3041 return 0;
3042 }
3043
3044 // Solaris only gives access to 128 real priorities at a time,
3045 // so we expand Java's ten to fill this range. This would be better
3046 // if we dynamically adjusted relative priorities.
3047 //
3048 // The ThreadPriorityPolicy option allows us to select 2 different
3049 // priority scales.
3050 //
3051 // ThreadPriorityPolicy=0
3052 // Since the Solaris' default priority is MaximumPriority, we do not
3053 // set a priority lower than Max unless a priority lower than
3054 // NormPriority is requested.
3055 //
3056 // ThreadPriorityPolicy=1
3057 // This mode causes the priority table to get filled with
3058 // linear values. NormPriority get's mapped to 50% of the
3059 // Maximum priority an so on. This will cause VM threads
3060 // to get unfair treatment against other Solaris processes
3061 // which do not explicitly alter their thread priorities.
3062
3063 int os::java_to_os_priority[CriticalPriority + 1] = {
3064 -99999, // 0 Entry should never be used
3065
3066 0, // 1 MinPriority
3067 32, // 2
3068 64, // 3
3069
3070 96, // 4
3071 127, // 5 NormPriority
3072 127, // 6
3073
3074 127, // 7
3075 127, // 8
3076 127, // 9 NearMaxPriority
3077
3078 127, // 10 MaxPriority
3079
3080 -criticalPrio // 11 CriticalPriority
3081 };
3082
3083 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3084 OSThread* osthread = thread->osthread();
3085
3086 // Save requested priority in case the thread hasn't been started
3087 osthread->set_native_priority(newpri);
3088
3089 // Check for critical priority request
3090 bool fxcritical = false;
3091 if (newpri == -criticalPrio) {
3092 fxcritical = true;
3093 newpri = criticalPrio;
3094 }
3095
3096 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3097 if (!UseThreadPriorities) return OS_OK;
3098
3099 int status = 0;
3100
3101 if (!fxcritical) {
3102 // Use thr_setprio only if we have a priority that thr_setprio understands
3103 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3104 }
3105
3106 int lwp_status =
3107 set_lwp_class_and_priority(osthread->thread_id(),
3108 osthread->lwp_id(),
3109 newpri,
3110 fxcritical ? fxLimits.schedPolicy : myClass,
3111 !fxcritical);
3112 if (lwp_status != 0 && fxcritical) {
3113 // Try again, this time without changing the scheduling class
3114 newpri = java_MaxPriority_to_os_priority;
3115 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3116 osthread->lwp_id(),
3117 newpri, myClass, false);
3118 }
3119 status |= lwp_status;
3120 return (status == 0) ? OS_OK : OS_ERR;
3121 }
3122
3123
3124 OSReturn os::get_native_priority(const Thread* const thread,
3125 int *priority_ptr) {
3126 int p;
3127 if (!UseThreadPriorities) {
3128 *priority_ptr = NormalPriority;
3129 return OS_OK;
3130 }
3131 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3132 if (status != 0) {
3133 return OS_ERR;
3134 }
3135 *priority_ptr = p;
3136 return OS_OK;
3137 }
3138
3139 ////////////////////////////////////////////////////////////////////////////////
3140 // suspend/resume support
3141
3142 // The low-level signal-based suspend/resume support is a remnant from the
3143 // old VM-suspension that used to be for java-suspension, safepoints etc,
3144 // within hotspot. Currently used by JFR's OSThreadSampler
3145 //
3146 // The remaining code is greatly simplified from the more general suspension
3147 // code that used to be used.
3148 //
3149 // The protocol is quite simple:
3150 // - suspend:
3151 // - sends a signal to the target thread
3152 // - polls the suspend state of the osthread using a yield loop
3153 // - target thread signal handler (SR_handler) sets suspend state
3154 // and blocks in sigsuspend until continued
3155 // - resume:
3156 // - sets target osthread state to continue
3157 // - sends signal to end the sigsuspend loop in the SR_handler
3158 //
3159 // Note that the SR_lock plays no role in this suspend/resume protocol,
3160 // but is checked for NULL in SR_handler as a thread termination indicator.
3161 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
3162 //
3163 // Note that resume_clear_context() and suspend_save_context() are needed
3164 // by SR_handler(), so that fetch_frame_from_ucontext() works,
3165 // which in part is used by:
3166 // - Forte Analyzer: AsyncGetCallTrace()
3167 // - StackBanging: get_frame_at_stack_banging_point()
3168 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler()
3169
3170 static void resume_clear_context(OSThread *osthread) {
3171 osthread->set_ucontext(NULL);
3172 }
3173
3174 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3175 osthread->set_ucontext(context);
3176 }
3177
3178 static PosixSemaphore sr_semaphore;
3179
3180 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) {
3181 // Save and restore errno to avoid confusing native code with EINTR
3182 // after sigsuspend.
3183 int old_errno = errno;
3184
3185 OSThread* osthread = thread->osthread();
3186 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3187
3188 os::SuspendResume::State current = osthread->sr.state();
3189 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3190 suspend_save_context(osthread, context);
3191
3192 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3193 os::SuspendResume::State state = osthread->sr.suspended();
3194 if (state == os::SuspendResume::SR_SUSPENDED) {
3195 sigset_t suspend_set; // signals for sigsuspend()
3196
3197 // get current set of blocked signals and unblock resume signal
3198 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3199 sigdelset(&suspend_set, ASYNC_SIGNAL);
3200
3201 sr_semaphore.signal();
3202 // wait here until we are resumed
3203 while (1) {
3204 sigsuspend(&suspend_set);
3205
3206 os::SuspendResume::State result = osthread->sr.running();
3207 if (result == os::SuspendResume::SR_RUNNING) {
3208 sr_semaphore.signal();
3209 break;
3210 }
3211 }
3212
3213 } else if (state == os::SuspendResume::SR_RUNNING) {
3214 // request was cancelled, continue
3215 } else {
3216 ShouldNotReachHere();
3217 }
3218
3219 resume_clear_context(osthread);
3220 } else if (current == os::SuspendResume::SR_RUNNING) {
3221 // request was cancelled, continue
3222 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3223 // ignore
3224 } else {
3225 // ignore
3226 }
3227
3228 errno = old_errno;
3229 }
3230
3231 void os::print_statistics() {
3232 }
3233
3234 bool os::message_box(const char* title, const char* message) {
3235 int i;
3236 fdStream err(defaultStream::error_fd());
3237 for (i = 0; i < 78; i++) err.print_raw("=");
3238 err.cr();
3239 err.print_raw_cr(title);
3240 for (i = 0; i < 78; i++) err.print_raw("-");
3241 err.cr();
3242 err.print_raw_cr(message);
3243 for (i = 0; i < 78; i++) err.print_raw("=");
3244 err.cr();
3245
3246 char buf[16];
3247 // Prevent process from exiting upon "read error" without consuming all CPU
3248 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3249
3250 return buf[0] == 'y' || buf[0] == 'Y';
3251 }
3252
3253 static int sr_notify(OSThread* osthread) {
3254 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3255 assert_status(status == 0, status, "thr_kill");
3256 return status;
3257 }
3258
3259 // "Randomly" selected value for how long we want to spin
3260 // before bailing out on suspending a thread, also how often
3261 // we send a signal to a thread we want to resume
3262 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3263 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3264
3265 static bool do_suspend(OSThread* osthread) {
3266 assert(osthread->sr.is_running(), "thread should be running");
3267 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3268
3269 // mark as suspended and send signal
3270 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3271 // failed to switch, state wasn't running?
3272 ShouldNotReachHere();
3273 return false;
3274 }
3275
3276 if (sr_notify(osthread) != 0) {
3277 ShouldNotReachHere();
3278 }
3279
3280 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3281 while (true) {
3282 if (sr_semaphore.timedwait(2000)) {
3283 break;
3284 } else {
3285 // timeout
3286 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3287 if (cancelled == os::SuspendResume::SR_RUNNING) {
3288 return false;
3289 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3290 // make sure that we consume the signal on the semaphore as well
3291 sr_semaphore.wait();
3292 break;
3293 } else {
3294 ShouldNotReachHere();
3295 return false;
3296 }
3297 }
3298 }
3299
3300 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3301 return true;
3302 }
3303
3304 static void do_resume(OSThread* osthread) {
3305 assert(osthread->sr.is_suspended(), "thread should be suspended");
3306 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3307
3308 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3309 // failed to switch to WAKEUP_REQUEST
3310 ShouldNotReachHere();
3311 return;
3312 }
3313
3314 while (true) {
3315 if (sr_notify(osthread) == 0) {
3316 if (sr_semaphore.timedwait(2)) {
3317 if (osthread->sr.is_running()) {
3318 return;
3319 }
3320 }
3321 } else {
3322 ShouldNotReachHere();
3323 }
3324 }
3325
3326 guarantee(osthread->sr.is_running(), "Must be running!");
3327 }
3328
3329 void os::SuspendedThreadTask::internal_do_task() {
3330 if (do_suspend(_thread->osthread())) {
3331 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3332 do_task(context);
3333 do_resume(_thread->osthread());
3334 }
3335 }
3336
3337 // This does not do anything on Solaris. This is basically a hook for being
3338 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3339 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3340 const methodHandle& method, JavaCallArguments* args,
3341 Thread* thread) {
3342 f(value, method, args, thread);
3343 }
3344
3345 // This routine may be used by user applications as a "hook" to catch signals.
3346 // The user-defined signal handler must pass unrecognized signals to this
3347 // routine, and if it returns true (non-zero), then the signal handler must
3348 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3349 // routine will never retun false (zero), but instead will execute a VM panic
3350 // routine kill the process.
3351 //
3352 // If this routine returns false, it is OK to call it again. This allows
3353 // the user-defined signal handler to perform checks either before or after
3354 // the VM performs its own checks. Naturally, the user code would be making
3355 // a serious error if it tried to handle an exception (such as a null check
3356 // or breakpoint) that the VM was generating for its own correct operation.
3357 //
3358 // This routine may recognize any of the following kinds of signals:
3359 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3360 // ASYNC_SIGNAL.
3361 // It should be consulted by handlers for any of those signals.
3362 //
3363 // The caller of this routine must pass in the three arguments supplied
3364 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3365 // field of the structure passed to sigaction(). This routine assumes that
3366 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3367 //
3368 // Note that the VM will print warnings if it detects conflicting signal
3369 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3370 //
3371 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3372 siginfo_t* siginfo,
3373 void* ucontext,
3374 int abort_if_unrecognized);
3375
3376
3377 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3378 int orig_errno = errno; // Preserve errno value over signal handler.
3379 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3380 errno = orig_errno;
3381 }
3382
3383 // This boolean allows users to forward their own non-matching signals
3384 // to JVM_handle_solaris_signal, harmlessly.
3385 bool os::Solaris::signal_handlers_are_installed = false;
3386
3387 // For signal-chaining
3388 bool os::Solaris::libjsig_is_loaded = false;
3389 typedef struct sigaction *(*get_signal_t)(int);
3390 get_signal_t os::Solaris::get_signal_action = NULL;
3391
3392 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3393 struct sigaction *actp = NULL;
3394
3395 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3396 // Retrieve the old signal handler from libjsig
3397 actp = (*get_signal_action)(sig);
3398 }
3399 if (actp == NULL) {
3400 // Retrieve the preinstalled signal handler from jvm
3401 actp = get_preinstalled_handler(sig);
3402 }
3403
3404 return actp;
3405 }
3406
3407 static bool call_chained_handler(struct sigaction *actp, int sig,
3408 siginfo_t *siginfo, void *context) {
3409 // Call the old signal handler
3410 if (actp->sa_handler == SIG_DFL) {
3411 // It's more reasonable to let jvm treat it as an unexpected exception
3412 // instead of taking the default action.
3413 return false;
3414 } else if (actp->sa_handler != SIG_IGN) {
3415 if ((actp->sa_flags & SA_NODEFER) == 0) {
3416 // automaticlly block the signal
3417 sigaddset(&(actp->sa_mask), sig);
3418 }
3419
3420 sa_handler_t hand;
3421 sa_sigaction_t sa;
3422 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3423 // retrieve the chained handler
3424 if (siginfo_flag_set) {
3425 sa = actp->sa_sigaction;
3426 } else {
3427 hand = actp->sa_handler;
3428 }
3429
3430 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3431 actp->sa_handler = SIG_DFL;
3432 }
3433
3434 // try to honor the signal mask
3435 sigset_t oset;
3436 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3437
3438 // call into the chained handler
3439 if (siginfo_flag_set) {
3440 (*sa)(sig, siginfo, context);
3441 } else {
3442 (*hand)(sig);
3443 }
3444
3445 // restore the signal mask
3446 pthread_sigmask(SIG_SETMASK, &oset, 0);
3447 }
3448 // Tell jvm's signal handler the signal is taken care of.
3449 return true;
3450 }
3451
3452 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3453 bool chained = false;
3454 // signal-chaining
3455 if (UseSignalChaining) {
3456 struct sigaction *actp = get_chained_signal_action(sig);
3457 if (actp != NULL) {
3458 chained = call_chained_handler(actp, sig, siginfo, context);
3459 }
3460 }
3461 return chained;
3462 }
3463
3464 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3465 assert((chainedsigactions != (struct sigaction *)NULL) &&
3466 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3467 if (preinstalled_sigs[sig] != 0) {
3468 return &chainedsigactions[sig];
3469 }
3470 return NULL;
3471 }
3472
3473 void os::Solaris::save_preinstalled_handler(int sig,
3474 struct sigaction& oldAct) {
3475 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3476 assert((chainedsigactions != (struct sigaction *)NULL) &&
3477 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3478 chainedsigactions[sig] = oldAct;
3479 preinstalled_sigs[sig] = 1;
3480 }
3481
3482 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3483 bool oktochain) {
3484 // Check for overwrite.
3485 struct sigaction oldAct;
3486 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3487 void* oldhand =
3488 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3489 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3490 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3491 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3492 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3493 if (AllowUserSignalHandlers || !set_installed) {
3494 // Do not overwrite; user takes responsibility to forward to us.
3495 return;
3496 } else if (UseSignalChaining) {
3497 if (oktochain) {
3498 // save the old handler in jvm
3499 save_preinstalled_handler(sig, oldAct);
3500 } else {
3501 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3502 }
3503 // libjsig also interposes the sigaction() call below and saves the
3504 // old sigaction on it own.
3505 } else {
3506 fatal("Encountered unexpected pre-existing sigaction handler "
3507 "%#lx for signal %d.", (long)oldhand, sig);
3508 }
3509 }
3510
3511 struct sigaction sigAct;
3512 sigfillset(&(sigAct.sa_mask));
3513 sigAct.sa_handler = SIG_DFL;
3514
3515 sigAct.sa_sigaction = signalHandler;
3516 // Handle SIGSEGV on alternate signal stack if
3517 // not using stack banging
3518 if (!UseStackBanging && sig == SIGSEGV) {
3519 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3520 } else {
3521 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3522 }
3523 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3524
3525 sigaction(sig, &sigAct, &oldAct);
3526
3527 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3528 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3529 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3530 }
3531
3532
3533 #define DO_SIGNAL_CHECK(sig) \
3534 do { \
3535 if (!sigismember(&check_signal_done, sig)) { \
3536 os::Solaris::check_signal_handler(sig); \
3537 } \
3538 } while (0)
3539
3540 // This method is a periodic task to check for misbehaving JNI applications
3541 // under CheckJNI, we can add any periodic checks here
3542
3543 void os::run_periodic_checks() {
3544 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3545 // thereby preventing a NULL checks.
3546 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3547
3548 if (check_signals == false) return;
3549
3550 // SEGV and BUS if overridden could potentially prevent
3551 // generation of hs*.log in the event of a crash, debugging
3552 // such a case can be very challenging, so we absolutely
3553 // check for the following for a good measure:
3554 DO_SIGNAL_CHECK(SIGSEGV);
3555 DO_SIGNAL_CHECK(SIGILL);
3556 DO_SIGNAL_CHECK(SIGFPE);
3557 DO_SIGNAL_CHECK(SIGBUS);
3558 DO_SIGNAL_CHECK(SIGPIPE);
3559 DO_SIGNAL_CHECK(SIGXFSZ);
3560 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3561
3562 // ReduceSignalUsage allows the user to override these handlers
3563 // see comments at the very top and jvm_solaris.h
3564 if (!ReduceSignalUsage) {
3565 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3566 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3567 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3568 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3569 }
3570 }
3571
3572 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3573
3574 static os_sigaction_t os_sigaction = NULL;
3575
3576 void os::Solaris::check_signal_handler(int sig) {
3577 char buf[O_BUFLEN];
3578 address jvmHandler = NULL;
3579
3580 struct sigaction act;
3581 if (os_sigaction == NULL) {
3582 // only trust the default sigaction, in case it has been interposed
3583 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3584 if (os_sigaction == NULL) return;
3585 }
3586
3587 os_sigaction(sig, (struct sigaction*)NULL, &act);
3588
3589 address thisHandler = (act.sa_flags & SA_SIGINFO)
3590 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3591 : CAST_FROM_FN_PTR(address, act.sa_handler);
3592
3593
3594 switch (sig) {
3595 case SIGSEGV:
3596 case SIGBUS:
3597 case SIGFPE:
3598 case SIGPIPE:
3599 case SIGXFSZ:
3600 case SIGILL:
3601 case ASYNC_SIGNAL:
3602 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3603 break;
3604
3605 case SHUTDOWN1_SIGNAL:
3606 case SHUTDOWN2_SIGNAL:
3607 case SHUTDOWN3_SIGNAL:
3608 case BREAK_SIGNAL:
3609 jvmHandler = (address)user_handler();
3610 break;
3611
3612 default:
3613 return;
3614 }
3615
3616 if (thisHandler != jvmHandler) {
3617 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3618 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3619 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3620 // No need to check this sig any longer
3621 sigaddset(&check_signal_done, sig);
3622 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3623 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3624 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3625 exception_name(sig, buf, O_BUFLEN));
3626 }
3627 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
3628 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3629 tty->print("expected:");
3630 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
3631 tty->cr();
3632 tty->print(" found:");
3633 os::Posix::print_sa_flags(tty, act.sa_flags);
3634 tty->cr();
3635 // No need to check this sig any longer
3636 sigaddset(&check_signal_done, sig);
3637 }
3638
3639 // Print all the signal handler state
3640 if (sigismember(&check_signal_done, sig)) {
3641 print_signal_handlers(tty, buf, O_BUFLEN);
3642 }
3643
3644 }
3645
3646 void os::Solaris::install_signal_handlers() {
3647 signal_handlers_are_installed = true;
3648
3649 // signal-chaining
3650 typedef void (*signal_setting_t)();
3651 signal_setting_t begin_signal_setting = NULL;
3652 signal_setting_t end_signal_setting = NULL;
3653 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3654 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3655 if (begin_signal_setting != NULL) {
3656 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3657 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3658 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3659 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3660 libjsig_is_loaded = true;
3661 assert(UseSignalChaining, "should enable signal-chaining");
3662 }
3663 if (libjsig_is_loaded) {
3664 // Tell libjsig jvm is setting signal handlers
3665 (*begin_signal_setting)();
3666 }
3667
3668 set_signal_handler(SIGSEGV, true, true);
3669 set_signal_handler(SIGPIPE, true, true);
3670 set_signal_handler(SIGXFSZ, true, true);
3671 set_signal_handler(SIGBUS, true, true);
3672 set_signal_handler(SIGILL, true, true);
3673 set_signal_handler(SIGFPE, true, true);
3674 set_signal_handler(ASYNC_SIGNAL, true, true);
3675
3676 if (libjsig_is_loaded) {
3677 // Tell libjsig jvm finishes setting signal handlers
3678 (*end_signal_setting)();
3679 }
3680
3681 // We don't activate signal checker if libjsig is in place, we trust ourselves
3682 // and if UserSignalHandler is installed all bets are off.
3683 // Log that signal checking is off only if -verbose:jni is specified.
3684 if (CheckJNICalls) {
3685 if (libjsig_is_loaded) {
3686 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled");
3687 check_signals = false;
3688 }
3689 if (AllowUserSignalHandlers) {
3690 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3691 check_signals = false;
3692 }
3693 }
3694 }
3695
3696
3697 void report_error(const char* file_name, int line_no, const char* title,
3698 const char* format, ...);
3699
3700 // (Static) wrappers for the liblgrp API
3701 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
3702 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
3703 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
3704 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
3705 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
3706 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
3707 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
3708 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
3709 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
3710
3711 static address resolve_symbol_lazy(const char* name) {
3712 address addr = (address) dlsym(RTLD_DEFAULT, name);
3713 if (addr == NULL) {
3714 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
3715 addr = (address) dlsym(RTLD_NEXT, name);
3716 }
3717 return addr;
3718 }
3719
3720 static address resolve_symbol(const char* name) {
3721 address addr = resolve_symbol_lazy(name);
3722 if (addr == NULL) {
3723 fatal(dlerror());
3724 }
3725 return addr;
3726 }
3727
3728 void os::Solaris::libthread_init() {
3729 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
3730
3731 lwp_priocntl_init();
3732
3733 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
3734 if (func == NULL) {
3735 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
3736 // Guarantee that this VM is running on an new enough OS (5.6 or
3737 // later) that it will have a new enough libthread.so.
3738 guarantee(func != NULL, "libthread.so is too old.");
3739 }
3740
3741 int size;
3742 void (*handler_info_func)(address *, int *);
3743 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
3744 handler_info_func(&handler_start, &size);
3745 handler_end = handler_start + size;
3746 }
3747
3748
3749 int_fnP_mutex_tP os::Solaris::_mutex_lock;
3750 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
3751 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
3752 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
3753 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
3754 int os::Solaris::_mutex_scope = USYNC_THREAD;
3755
3756 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
3757 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
3758 int_fnP_cond_tP os::Solaris::_cond_signal;
3759 int_fnP_cond_tP os::Solaris::_cond_broadcast;
3760 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
3761 int_fnP_cond_tP os::Solaris::_cond_destroy;
3762 int os::Solaris::_cond_scope = USYNC_THREAD;
3763 bool os::Solaris::_synchronization_initialized;
3764
3765 void os::Solaris::synchronization_init() {
3766 if (UseLWPSynchronization) {
3767 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
3768 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
3769 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
3770 os::Solaris::set_mutex_init(lwp_mutex_init);
3771 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
3772 os::Solaris::set_mutex_scope(USYNC_THREAD);
3773
3774 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
3775 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
3776 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
3777 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
3778 os::Solaris::set_cond_init(lwp_cond_init);
3779 os::Solaris::set_cond_destroy(lwp_cond_destroy);
3780 os::Solaris::set_cond_scope(USYNC_THREAD);
3781 } else {
3782 os::Solaris::set_mutex_scope(USYNC_THREAD);
3783 os::Solaris::set_cond_scope(USYNC_THREAD);
3784
3785 if (UsePthreads) {
3786 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
3787 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
3788 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
3789 os::Solaris::set_mutex_init(pthread_mutex_default_init);
3790 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
3791
3792 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
3793 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
3794 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
3795 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
3796 os::Solaris::set_cond_init(pthread_cond_default_init);
3797 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
3798 } else {
3799 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
3800 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
3801 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
3802 os::Solaris::set_mutex_init(::mutex_init);
3803 os::Solaris::set_mutex_destroy(::mutex_destroy);
3804
3805 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
3806 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
3807 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
3808 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
3809 os::Solaris::set_cond_init(::cond_init);
3810 os::Solaris::set_cond_destroy(::cond_destroy);
3811 }
3812 }
3813 _synchronization_initialized = true;
3814 }
3815
3816 bool os::Solaris::liblgrp_init() {
3817 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
3818 if (handle != NULL) {
3819 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
3820 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
3821 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
3822 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
3823 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
3824 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
3825 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
3826 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
3827 dlsym(handle, "lgrp_cookie_stale")));
3828
3829 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
3830 set_lgrp_cookie(c);
3831 return true;
3832 }
3833 return false;
3834 }
3835
3836 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
3837 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
3838 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
3839
3840 void init_pset_getloadavg_ptr(void) {
3841 pset_getloadavg_ptr =
3842 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
3843 if (pset_getloadavg_ptr == NULL) {
3844 log_warning(os)("pset_getloadavg function not found");
3845 }
3846 }
3847
3848 int os::Solaris::_dev_zero_fd = -1;
3849
3850 // this is called _before_ the global arguments have been parsed
3851 void os::init(void) {
3852 _initial_pid = getpid();
3853
3854 max_hrtime = first_hrtime = gethrtime();
3855
3856 init_random(1234567);
3857
3858 page_size = sysconf(_SC_PAGESIZE);
3859 if (page_size == -1) {
3860 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
3861 }
3862 init_page_sizes((size_t) page_size);
3863
3864 Solaris::initialize_system_info();
3865
3866 int fd = ::open("/dev/zero", O_RDWR);
3867 if (fd < 0) {
3868 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
3869 } else {
3870 Solaris::set_dev_zero_fd(fd);
3871
3872 // Close on exec, child won't inherit.
3873 fcntl(fd, F_SETFD, FD_CLOEXEC);
3874 }
3875
3876 clock_tics_per_sec = CLK_TCK;
3877
3878 // check if dladdr1() exists; dladdr1 can provide more information than
3879 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
3880 // and is available on linker patches for 5.7 and 5.8.
3881 // libdl.so must have been loaded, this call is just an entry lookup
3882 void * hdl = dlopen("libdl.so", RTLD_NOW);
3883 if (hdl) {
3884 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
3885 }
3886
3887 // main_thread points to the thread that created/loaded the JVM.
3888 main_thread = thr_self();
3889
3890 // dynamic lookup of functions that may not be available in our lowest
3891 // supported Solaris release
3892 void * handle = dlopen("libc.so.1", RTLD_LAZY);
3893 if (handle != NULL) {
3894 Solaris::_pthread_setname_np = // from 11.3
3895 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
3896 }
3897
3898 // Shared Posix initialization
3899 os::Posix::init();
3900 }
3901
3902 // To install functions for atexit system call
3903 extern "C" {
3904 static void perfMemory_exit_helper() {
3905 perfMemory_exit();
3906 }
3907 }
3908
3909 // this is called _after_ the global arguments have been parsed
3910 jint os::init_2(void) {
3911 // try to enable extended file IO ASAP, see 6431278
3912 os::Solaris::try_enable_extended_io();
3913
3914 // Check and sets minimum stack sizes against command line options
3915 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3916 return JNI_ERR;
3917 }
3918
3919 Solaris::libthread_init();
3920
3921 if (UseNUMA) {
3922 if (!Solaris::liblgrp_init()) {
3923 UseNUMA = false;
3924 } else {
3925 size_t lgrp_limit = os::numa_get_groups_num();
3926 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
3927 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
3928 FREE_C_HEAP_ARRAY(int, lgrp_ids);
3929 if (lgrp_num < 2) {
3930 // There's only one locality group, disable NUMA.
3931 UseNUMA = false;
3932 }
3933 }
3934 if (!UseNUMA && ForceNUMA) {
3935 UseNUMA = true;
3936 }
3937 }
3938
3939 Solaris::signal_sets_init();
3940 Solaris::init_signal_mem();
3941 Solaris::install_signal_handlers();
3942 // Initialize data for jdk.internal.misc.Signal
3943 if (!ReduceSignalUsage) {
3944 jdk_misc_signal_init();
3945 }
3946
3947 // initialize synchronization primitives to use either thread or
3948 // lwp synchronization (controlled by UseLWPSynchronization)
3949 Solaris::synchronization_init();
3950 DEBUG_ONLY(os::set_mutex_init_done();)
3951
3952 if (MaxFDLimit) {
3953 // set the number of file descriptors to max. print out error
3954 // if getrlimit/setrlimit fails but continue regardless.
3955 struct rlimit nbr_files;
3956 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3957 if (status != 0) {
3958 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3959 } else {
3960 nbr_files.rlim_cur = nbr_files.rlim_max;
3961 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3962 if (status != 0) {
3963 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3964 }
3965 }
3966 }
3967
3968 // Calculate theoretical max. size of Threads to guard gainst
3969 // artifical out-of-memory situations, where all available address-
3970 // space has been reserved by thread stacks. Default stack size is 1Mb.
3971 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
3972 JavaThread::stack_size_at_create() : (1*K*K);
3973 assert(pre_thread_stack_size != 0, "Must have a stack");
3974 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
3975 // we should start doing Virtual Memory banging. Currently when the threads will
3976 // have used all but 200Mb of space.
3977 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
3978 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
3979
3980 // at-exit methods are called in the reverse order of their registration.
3981 // In Solaris 7 and earlier, atexit functions are called on return from
3982 // main or as a result of a call to exit(3C). There can be only 32 of
3983 // these functions registered and atexit() does not set errno. In Solaris
3984 // 8 and later, there is no limit to the number of functions registered
3985 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
3986 // functions are called upon dlclose(3DL) in addition to return from main
3987 // and exit(3C).
3988
3989 if (PerfAllowAtExitRegistration) {
3990 // only register atexit functions if PerfAllowAtExitRegistration is set.
3991 // atexit functions can be delayed until process exit time, which
3992 // can be problematic for embedded VM situations. Embedded VMs should
3993 // call DestroyJavaVM() to assure that VM resources are released.
3994
3995 // note: perfMemory_exit_helper atexit function may be removed in
3996 // the future if the appropriate cleanup code can be added to the
3997 // VM_Exit VMOperation's doit method.
3998 if (atexit(perfMemory_exit_helper) != 0) {
3999 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4000 }
4001 }
4002
4003 // Init pset_loadavg function pointer
4004 init_pset_getloadavg_ptr();
4005
4006 // Shared Posix initialization
4007 os::Posix::init_2();
4008
4009 return JNI_OK;
4010 }
4011
4012 // Mark the polling page as unreadable
4013 void os::make_polling_page_unreadable(void) {
4014 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_NONE", p2i(_polling_page));
4015 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4016 fatal("Could not disable polling page");
4017 }
4018 }
4019
4020 // Mark the polling page as readable
4021 void os::make_polling_page_readable(void) {
4022 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_READ", p2i(_polling_page));
4023 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4024 fatal("Could not enable polling page");
4025 }
4026 }
4027
4028 // Is a (classpath) directory empty?
4029 bool os::dir_is_empty(const char* path) {
4030 DIR *dir = NULL;
4031 struct dirent *ptr;
4032
4033 dir = opendir(path);
4034 if (dir == NULL) return true;
4035
4036 // Scan the directory
4037 bool result = true;
4038 while (result && (ptr = readdir(dir)) != NULL) {
4039 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4040 result = false;
4041 }
4042 }
4043 closedir(dir);
4044 return result;
4045 }
4046
4047 // This code originates from JDK's sysOpen and open64_w
4048 // from src/solaris/hpi/src/system_md.c
4049
4050 int os::open(const char *path, int oflag, int mode) {
4051 if (strlen(path) > MAX_PATH - 1) {
4052 errno = ENAMETOOLONG;
4053 return -1;
4054 }
4055 int fd;
4056
4057 fd = ::open64(path, oflag, mode);
4058 if (fd == -1) return -1;
4059
4060 // If the open succeeded, the file might still be a directory
4061 {
4062 struct stat64 buf64;
4063 int ret = ::fstat64(fd, &buf64);
4064 int st_mode = buf64.st_mode;
4065
4066 if (ret != -1) {
4067 if ((st_mode & S_IFMT) == S_IFDIR) {
4068 errno = EISDIR;
4069 ::close(fd);
4070 return -1;
4071 }
4072 } else {
4073 ::close(fd);
4074 return -1;
4075 }
4076 }
4077
4078 // 32-bit Solaris systems suffer from:
4079 //
4080 // - an historical default soft limit of 256 per-process file
4081 // descriptors that is too low for many Java programs.
4082 //
4083 // - a design flaw where file descriptors created using stdio
4084 // fopen must be less than 256, _even_ when the first limit above
4085 // has been raised. This can cause calls to fopen (but not calls to
4086 // open, for example) to fail mysteriously, perhaps in 3rd party
4087 // native code (although the JDK itself uses fopen). One can hardly
4088 // criticize them for using this most standard of all functions.
4089 //
4090 // We attempt to make everything work anyways by:
4091 //
4092 // - raising the soft limit on per-process file descriptors beyond
4093 // 256
4094 //
4095 // - As of Solaris 10u4, we can request that Solaris raise the 256
4096 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4097 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4098 //
4099 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4100 // workaround the bug by remapping non-stdio file descriptors below
4101 // 256 to ones beyond 256, which is done below.
4102 //
4103 // See:
4104 // 1085341: 32-bit stdio routines should support file descriptors >255
4105 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4106 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4107 // enable_extended_FILE_stdio() in VM initialisation
4108 // Giri Mandalika's blog
4109 // http://technopark02.blogspot.com/2005_05_01_archive.html
4110 //
4111 #ifndef _LP64
4112 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4113 int newfd = ::fcntl(fd, F_DUPFD, 256);
4114 if (newfd != -1) {
4115 ::close(fd);
4116 fd = newfd;
4117 }
4118 }
4119 #endif // 32-bit Solaris
4120
4121 // All file descriptors that are opened in the JVM and not
4122 // specifically destined for a subprocess should have the
4123 // close-on-exec flag set. If we don't set it, then careless 3rd
4124 // party native code might fork and exec without closing all
4125 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4126 // UNIXProcess.c), and this in turn might:
4127 //
4128 // - cause end-of-file to fail to be detected on some file
4129 // descriptors, resulting in mysterious hangs, or
4130 //
4131 // - might cause an fopen in the subprocess to fail on a system
4132 // suffering from bug 1085341.
4133 //
4134 // (Yes, the default setting of the close-on-exec flag is a Unix
4135 // design flaw)
4136 //
4137 // See:
4138 // 1085341: 32-bit stdio routines should support file descriptors >255
4139 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4140 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4141 //
4142 #ifdef FD_CLOEXEC
4143 {
4144 int flags = ::fcntl(fd, F_GETFD);
4145 if (flags != -1) {
4146 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4147 }
4148 }
4149 #endif
4150
4151 return fd;
4152 }
4153
4154 // create binary file, rewriting existing file if required
4155 int os::create_binary_file(const char* path, bool rewrite_existing) {
4156 int oflags = O_WRONLY | O_CREAT;
4157 if (!rewrite_existing) {
4158 oflags |= O_EXCL;
4159 }
4160 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4161 }
4162
4163 // return current position of file pointer
4164 jlong os::current_file_offset(int fd) {
4165 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4166 }
4167
4168 // move file pointer to the specified offset
4169 jlong os::seek_to_file_offset(int fd, jlong offset) {
4170 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4171 }
4172
4173 jlong os::lseek(int fd, jlong offset, int whence) {
4174 return (jlong) ::lseek64(fd, offset, whence);
4175 }
4176
4177 int os::ftruncate(int fd, jlong length) {
4178 return ::ftruncate64(fd, length);
4179 }
4180
4181 int os::fsync(int fd) {
4182 RESTARTABLE_RETURN_INT(::fsync(fd));
4183 }
4184
4185 int os::available(int fd, jlong *bytes) {
4186 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4187 "Assumed _thread_in_native");
4188 jlong cur, end;
4189 int mode;
4190 struct stat64 buf64;
4191
4192 if (::fstat64(fd, &buf64) >= 0) {
4193 mode = buf64.st_mode;
4194 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4195 int n,ioctl_return;
4196
4197 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4198 if (ioctl_return>= 0) {
4199 *bytes = n;
4200 return 1;
4201 }
4202 }
4203 }
4204 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4205 return 0;
4206 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4207 return 0;
4208 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4209 return 0;
4210 }
4211 *bytes = end - cur;
4212 return 1;
4213 }
4214
4215 // Map a block of memory.
4216 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4217 char *addr, size_t bytes, bool read_only,
4218 bool allow_exec) {
4219 int prot;
4220 int flags;
4221
4222 if (read_only) {
4223 prot = PROT_READ;
4224 flags = MAP_SHARED;
4225 } else {
4226 prot = PROT_READ | PROT_WRITE;
4227 flags = MAP_PRIVATE;
4228 }
4229
4230 if (allow_exec) {
4231 prot |= PROT_EXEC;
4232 }
4233
4234 if (addr != NULL) {
4235 flags |= MAP_FIXED;
4236 }
4237
4238 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4239 fd, file_offset);
4240 if (mapped_address == MAP_FAILED) {
4241 return NULL;
4242 }
4243 return mapped_address;
4244 }
4245
4246
4247 // Remap a block of memory.
4248 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4249 char *addr, size_t bytes, bool read_only,
4250 bool allow_exec) {
4251 // same as map_memory() on this OS
4252 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4253 allow_exec);
4254 }
4255
4256
4257 // Unmap a block of memory.
4258 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4259 return munmap(addr, bytes) == 0;
4260 }
4261
4262 void os::pause() {
4263 char filename[MAX_PATH];
4264 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4265 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
4266 } else {
4267 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4268 }
4269
4270 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4271 if (fd != -1) {
4272 struct stat buf;
4273 ::close(fd);
4274 while (::stat(filename, &buf) == 0) {
4275 (void)::poll(NULL, 0, 100);
4276 }
4277 } else {
4278 jio_fprintf(stderr,
4279 "Could not open pause file '%s', continuing immediately.\n", filename);
4280 }
4281 }
4282
4283 #ifndef PRODUCT
4284 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4285 // Turn this on if you need to trace synch operations.
4286 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4287 // and call record_synch_enable and record_synch_disable
4288 // around the computation of interest.
4289
4290 void record_synch(char* name, bool returning); // defined below
4291
4292 class RecordSynch {
4293 char* _name;
4294 public:
4295 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4296 ~RecordSynch() { record_synch(_name, true); }
4297 };
4298
4299 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4300 extern "C" ret name params { \
4301 typedef ret name##_t params; \
4302 static name##_t* implem = NULL; \
4303 static int callcount = 0; \
4304 if (implem == NULL) { \
4305 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4306 if (implem == NULL) fatal(dlerror()); \
4307 } \
4308 ++callcount; \
4309 RecordSynch _rs(#name); \
4310 inner; \
4311 return implem args; \
4312 }
4313 // in dbx, examine callcounts this way:
4314 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4315
4316 #define CHECK_POINTER_OK(p) \
4317 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4318 #define CHECK_MU \
4319 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4320 #define CHECK_CV \
4321 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4322 #define CHECK_P(p) \
4323 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4324
4325 #define CHECK_MUTEX(mutex_op) \
4326 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4327
4328 CHECK_MUTEX( mutex_lock)
4329 CHECK_MUTEX( _mutex_lock)
4330 CHECK_MUTEX( mutex_unlock)
4331 CHECK_MUTEX(_mutex_unlock)
4332 CHECK_MUTEX( mutex_trylock)
4333 CHECK_MUTEX(_mutex_trylock)
4334
4335 #define CHECK_COND(cond_op) \
4336 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4337
4338 CHECK_COND( cond_wait);
4339 CHECK_COND(_cond_wait);
4340 CHECK_COND(_cond_wait_cancel);
4341
4342 #define CHECK_COND2(cond_op) \
4343 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4344
4345 CHECK_COND2( cond_timedwait);
4346 CHECK_COND2(_cond_timedwait);
4347 CHECK_COND2(_cond_timedwait_cancel);
4348
4349 // do the _lwp_* versions too
4350 #define mutex_t lwp_mutex_t
4351 #define cond_t lwp_cond_t
4352 CHECK_MUTEX( _lwp_mutex_lock)
4353 CHECK_MUTEX( _lwp_mutex_unlock)
4354 CHECK_MUTEX( _lwp_mutex_trylock)
4355 CHECK_MUTEX( __lwp_mutex_lock)
4356 CHECK_MUTEX( __lwp_mutex_unlock)
4357 CHECK_MUTEX( __lwp_mutex_trylock)
4358 CHECK_MUTEX(___lwp_mutex_lock)
4359 CHECK_MUTEX(___lwp_mutex_unlock)
4360
4361 CHECK_COND( _lwp_cond_wait);
4362 CHECK_COND( __lwp_cond_wait);
4363 CHECK_COND(___lwp_cond_wait);
4364
4365 CHECK_COND2( _lwp_cond_timedwait);
4366 CHECK_COND2( __lwp_cond_timedwait);
4367 #undef mutex_t
4368 #undef cond_t
4369
4370 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4371 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4372 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4373 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4374 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4375 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4376 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4377 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4378
4379
4380 // recording machinery:
4381
4382 enum { RECORD_SYNCH_LIMIT = 200 };
4383 char* record_synch_name[RECORD_SYNCH_LIMIT];
4384 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4385 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4386 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4387 int record_synch_count = 0;
4388 bool record_synch_enabled = false;
4389
4390 // in dbx, examine recorded data this way:
4391 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4392
4393 void record_synch(char* name, bool returning) {
4394 if (record_synch_enabled) {
4395 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4396 record_synch_name[record_synch_count] = name;
4397 record_synch_returning[record_synch_count] = returning;
4398 record_synch_thread[record_synch_count] = thr_self();
4399 record_synch_arg0ptr[record_synch_count] = &name;
4400 record_synch_count++;
4401 }
4402 // put more checking code here:
4403 // ...
4404 }
4405 }
4406
4407 void record_synch_enable() {
4408 // start collecting trace data, if not already doing so
4409 if (!record_synch_enabled) record_synch_count = 0;
4410 record_synch_enabled = true;
4411 }
4412
4413 void record_synch_disable() {
4414 // stop collecting trace data
4415 record_synch_enabled = false;
4416 }
4417
4418 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4419 #endif // PRODUCT
4420
4421 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4422 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4423 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4424
4425
4426 // JVMTI & JVM monitoring and management support
4427 // The thread_cpu_time() and current_thread_cpu_time() are only
4428 // supported if is_thread_cpu_time_supported() returns true.
4429 // They are not supported on Solaris T1.
4430
4431 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4432 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4433 // of a thread.
4434 //
4435 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4436 // returns the fast estimate available on the platform.
4437
4438 // hrtime_t gethrvtime() return value includes
4439 // user time but does not include system time
4440 jlong os::current_thread_cpu_time() {
4441 return (jlong) gethrvtime();
4442 }
4443
4444 jlong os::thread_cpu_time(Thread *thread) {
4445 // return user level CPU time only to be consistent with
4446 // what current_thread_cpu_time returns.
4447 // thread_cpu_time_info() must be changed if this changes
4448 return os::thread_cpu_time(thread, false /* user time only */);
4449 }
4450
4451 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4452 if (user_sys_cpu_time) {
4453 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4454 } else {
4455 return os::current_thread_cpu_time();
4456 }
4457 }
4458
4459 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4460 char proc_name[64];
4461 int count;
4462 prusage_t prusage;
4463 jlong lwp_time;
4464 int fd;
4465
4466 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4467 getpid(),
4468 thread->osthread()->lwp_id());
4469 fd = ::open(proc_name, O_RDONLY);
4470 if (fd == -1) return -1;
4471
4472 do {
4473 count = ::pread(fd,
4474 (void *)&prusage.pr_utime,
4475 thr_time_size,
4476 thr_time_off);
4477 } while (count < 0 && errno == EINTR);
4478 ::close(fd);
4479 if (count < 0) return -1;
4480
4481 if (user_sys_cpu_time) {
4482 // user + system CPU time
4483 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4484 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4485 (jlong)prusage.pr_stime.tv_nsec +
4486 (jlong)prusage.pr_utime.tv_nsec;
4487 } else {
4488 // user level CPU time only
4489 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4490 (jlong)prusage.pr_utime.tv_nsec;
4491 }
4492
4493 return (lwp_time);
4494 }
4495
4496 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4497 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4498 info_ptr->may_skip_backward = false; // elapsed time not wall time
4499 info_ptr->may_skip_forward = false; // elapsed time not wall time
4500 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4501 }
4502
4503 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4504 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4505 info_ptr->may_skip_backward = false; // elapsed time not wall time
4506 info_ptr->may_skip_forward = false; // elapsed time not wall time
4507 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4508 }
4509
4510 bool os::is_thread_cpu_time_supported() {
4511 return true;
4512 }
4513
4514 // System loadavg support. Returns -1 if load average cannot be obtained.
4515 // Return the load average for our processor set if the primitive exists
4516 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4517 int os::loadavg(double loadavg[], int nelem) {
4518 if (pset_getloadavg_ptr != NULL) {
4519 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4520 } else {
4521 return ::getloadavg(loadavg, nelem);
4522 }
4523 }
4524
4525 //---------------------------------------------------------------------------------
4526
4527 bool os::find(address addr, outputStream* st) {
4528 Dl_info dlinfo;
4529 memset(&dlinfo, 0, sizeof(dlinfo));
4530 if (dladdr(addr, &dlinfo) != 0) {
4531 st->print(PTR_FORMAT ": ", addr);
4532 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4533 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4534 } else if (dlinfo.dli_fbase != NULL) {
4535 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4536 } else {
4537 st->print("<absolute address>");
4538 }
4539 if (dlinfo.dli_fname != NULL) {
4540 st->print(" in %s", dlinfo.dli_fname);
4541 }
4542 if (dlinfo.dli_fbase != NULL) {
4543 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4544 }
4545 st->cr();
4546
4547 if (Verbose) {
4548 // decode some bytes around the PC
4549 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4550 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4551 address lowest = (address) dlinfo.dli_sname;
4552 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4553 if (begin < lowest) begin = lowest;
4554 Dl_info dlinfo2;
4555 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4556 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4557 end = (address) dlinfo2.dli_saddr;
4558 }
4559 Disassembler::decode(begin, end, st);
4560 }
4561 return true;
4562 }
4563 return false;
4564 }
4565
4566 // Following function has been added to support HotSparc's libjvm.so running
4567 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4568 // src/solaris/hpi/native_threads in the EVM codebase.
4569 //
4570 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4571 // libraries and should thus be removed. We will leave it behind for a while
4572 // until we no longer want to able to run on top of 1.3.0 Solaris production
4573 // JDK. See 4341971.
4574
4575 #define STACK_SLACK 0x800
4576
4577 extern "C" {
4578 intptr_t sysThreadAvailableStackWithSlack() {
4579 stack_t st;
4580 intptr_t retval, stack_top;
4581 retval = thr_stksegment(&st);
4582 assert(retval == 0, "incorrect return value from thr_stksegment");
4583 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4584 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4585 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4586 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4587 }
4588 }
4589
4590 // ObjectMonitor park-unpark infrastructure ...
4591 //
4592 // We implement Solaris and Linux PlatformEvents with the
4593 // obvious condvar-mutex-flag triple.
4594 // Another alternative that works quite well is pipes:
4595 // Each PlatformEvent consists of a pipe-pair.
4596 // The thread associated with the PlatformEvent
4597 // calls park(), which reads from the input end of the pipe.
4598 // Unpark() writes into the other end of the pipe.
4599 // The write-side of the pipe must be set NDELAY.
4600 // Unfortunately pipes consume a large # of handles.
4601 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4602 // Using pipes for the 1st few threads might be workable, however.
4603 //
4604 // park() is permitted to return spuriously.
4605 // Callers of park() should wrap the call to park() in
4606 // an appropriate loop. A litmus test for the correct
4607 // usage of park is the following: if park() were modified
4608 // to immediately return 0 your code should still work,
4609 // albeit degenerating to a spin loop.
4610 //
4611 // In a sense, park()-unpark() just provides more polite spinning
4612 // and polling with the key difference over naive spinning being
4613 // that a parked thread needs to be explicitly unparked() in order
4614 // to wake up and to poll the underlying condition.
4615 //
4616 // Assumption:
4617 // Only one parker can exist on an event, which is why we allocate
4618 // them per-thread. Multiple unparkers can coexist.
4619 //
4620 // _Event transitions in park()
4621 // -1 => -1 : illegal
4622 // 1 => 0 : pass - return immediately
4623 // 0 => -1 : block; then set _Event to 0 before returning
4624 //
4625 // _Event transitions in unpark()
4626 // 0 => 1 : just return
4627 // 1 => 1 : just return
4628 // -1 => either 0 or 1; must signal target thread
4629 // That is, we can safely transition _Event from -1 to either
4630 // 0 or 1.
4631 //
4632 // _Event serves as a restricted-range semaphore.
4633 // -1 : thread is blocked, i.e. there is a waiter
4634 // 0 : neutral: thread is running or ready,
4635 // could have been signaled after a wait started
4636 // 1 : signaled - thread is running or ready
4637 //
4638 // Another possible encoding of _Event would be with
4639 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
4640 //
4641 // TODO-FIXME: add DTRACE probes for:
4642 // 1. Tx parks
4643 // 2. Ty unparks Tx
4644 // 3. Tx resumes from park
4645
4646
4647 // value determined through experimentation
4648 #define ROUNDINGFIX 11
4649
4650 // utility to compute the abstime argument to timedwait.
4651 // TODO-FIXME: switch from compute_abstime() to unpackTime().
4652
4653 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
4654 // millis is the relative timeout time
4655 // abstime will be the absolute timeout time
4656 if (millis < 0) millis = 0;
4657 struct timeval now;
4658 int status = gettimeofday(&now, NULL);
4659 assert(status == 0, "gettimeofday");
4660 jlong seconds = millis / 1000;
4661 jlong max_wait_period;
4662
4663 if (UseLWPSynchronization) {
4664 // forward port of fix for 4275818 (not sleeping long enough)
4665 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
4666 // _lwp_cond_timedwait() used a round_down algorithm rather
4667 // than a round_up. For millis less than our roundfactor
4668 // it rounded down to 0 which doesn't meet the spec.
4669 // For millis > roundfactor we may return a bit sooner, but
4670 // since we can not accurately identify the patch level and
4671 // this has already been fixed in Solaris 9 and 8 we will
4672 // leave it alone rather than always rounding down.
4673
4674 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
4675 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
4676 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
4677 max_wait_period = 21000000;
4678 } else {
4679 max_wait_period = 50000000;
4680 }
4681 millis %= 1000;
4682 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
4683 seconds = max_wait_period;
4684 }
4685 abstime->tv_sec = now.tv_sec + seconds;
4686 long usec = now.tv_usec + millis * 1000;
4687 if (usec >= 1000000) {
4688 abstime->tv_sec += 1;
4689 usec -= 1000000;
4690 }
4691 abstime->tv_nsec = usec * 1000;
4692 return abstime;
4693 }
4694
4695 void os::PlatformEvent::park() { // AKA: down()
4696 // Transitions for _Event:
4697 // -1 => -1 : illegal
4698 // 1 => 0 : pass - return immediately
4699 // 0 => -1 : block; then set _Event to 0 before returning
4700
4701 // Invariant: Only the thread associated with the Event/PlatformEvent
4702 // may call park().
4703 assert(_nParked == 0, "invariant");
4704
4705 int v;
4706 for (;;) {
4707 v = _Event;
4708 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
4709 }
4710 guarantee(v >= 0, "invariant");
4711 if (v == 0) {
4712 // Do this the hard way by blocking ...
4713 // See http://monaco.sfbay/detail.jsf?cr=5094058.
4714 int status = os::Solaris::mutex_lock(_mutex);
4715 assert_status(status == 0, status, "mutex_lock");
4716 guarantee(_nParked == 0, "invariant");
4717 ++_nParked;
4718 while (_Event < 0) {
4719 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
4720 // Treat this the same as if the wait was interrupted
4721 // With usr/lib/lwp going to kernel, always handle ETIME
4722 status = os::Solaris::cond_wait(_cond, _mutex);
4723 if (status == ETIME) status = EINTR;
4724 assert_status(status == 0 || status == EINTR, status, "cond_wait");
4725 }
4726 --_nParked;
4727 _Event = 0;
4728 status = os::Solaris::mutex_unlock(_mutex);
4729 assert_status(status == 0, status, "mutex_unlock");
4730 // Paranoia to ensure our locked and lock-free paths interact
4731 // correctly with each other.
4732 OrderAccess::fence();
4733 }
4734 }
4735
4736 int os::PlatformEvent::park(jlong millis) {
4737 // Transitions for _Event:
4738 // -1 => -1 : illegal
4739 // 1 => 0 : pass - return immediately
4740 // 0 => -1 : block; then set _Event to 0 before returning
4741
4742 guarantee(_nParked == 0, "invariant");
4743 int v;
4744 for (;;) {
4745 v = _Event;
4746 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break;
4747 }
4748 guarantee(v >= 0, "invariant");
4749 if (v != 0) return OS_OK;
4750
4751 int ret = OS_TIMEOUT;
4752 timestruc_t abst;
4753 compute_abstime(&abst, millis);
4754
4755 // See http://monaco.sfbay/detail.jsf?cr=5094058.
4756 int status = os::Solaris::mutex_lock(_mutex);
4757 assert_status(status == 0, status, "mutex_lock");
4758 guarantee(_nParked == 0, "invariant");
4759 ++_nParked;
4760 while (_Event < 0) {
4761 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
4762 assert_status(status == 0 || status == EINTR ||
4763 status == ETIME || status == ETIMEDOUT,
4764 status, "cond_timedwait");
4765 if (!FilterSpuriousWakeups) break; // previous semantics
4766 if (status == ETIME || status == ETIMEDOUT) break;
4767 // We consume and ignore EINTR and spurious wakeups.
4768 }
4769 --_nParked;
4770 if (_Event >= 0) ret = OS_OK;
4771 _Event = 0;
4772 status = os::Solaris::mutex_unlock(_mutex);
4773 assert_status(status == 0, status, "mutex_unlock");
4774 // Paranoia to ensure our locked and lock-free paths interact
4775 // correctly with each other.
4776 OrderAccess::fence();
4777 return ret;
4778 }
4779
4780 void os::PlatformEvent::unpark() {
4781 // Transitions for _Event:
4782 // 0 => 1 : just return
4783 // 1 => 1 : just return
4784 // -1 => either 0 or 1; must signal target thread
4785 // That is, we can safely transition _Event from -1 to either
4786 // 0 or 1.
4787 // See also: "Semaphores in Plan 9" by Mullender & Cox
4788 //
4789 // Note: Forcing a transition from "-1" to "1" on an unpark() means
4790 // that it will take two back-to-back park() calls for the owning
4791 // thread to block. This has the benefit of forcing a spurious return
4792 // from the first park() call after an unpark() call which will help
4793 // shake out uses of park() and unpark() without condition variables.
4794
4795 if (Atomic::xchg(&_Event, 1) >= 0) return;
4796
4797 // If the thread associated with the event was parked, wake it.
4798 // Wait for the thread assoc with the PlatformEvent to vacate.
4799 int status = os::Solaris::mutex_lock(_mutex);
4800 assert_status(status == 0, status, "mutex_lock");
4801 int AnyWaiters = _nParked;
4802 status = os::Solaris::mutex_unlock(_mutex);
4803 assert_status(status == 0, status, "mutex_unlock");
4804 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
4805 if (AnyWaiters != 0) {
4806 // Note that we signal() *after* dropping the lock for "immortal" Events.
4807 // This is safe and avoids a common class of futile wakeups. In rare
4808 // circumstances this can cause a thread to return prematurely from
4809 // cond_{timed}wait() but the spurious wakeup is benign and the victim
4810 // will simply re-test the condition and re-park itself.
4811 // This provides particular benefit if the underlying platform does not
4812 // provide wait morphing.
4813 status = os::Solaris::cond_signal(_cond);
4814 assert_status(status == 0, status, "cond_signal");
4815 }
4816 }
4817
4818 // JSR166
4819 // -------------------------------------------------------
4820
4821 // The solaris and linux implementations of park/unpark are fairly
4822 // conservative for now, but can be improved. They currently use a
4823 // mutex/condvar pair, plus _counter.
4824 // Park decrements _counter if > 0, else does a condvar wait. Unpark
4825 // sets count to 1 and signals condvar. Only one thread ever waits
4826 // on the condvar. Contention seen when trying to park implies that someone
4827 // is unparking you, so don't wait. And spurious returns are fine, so there
4828 // is no need to track notifications.
4829
4830 #define MAX_SECS 100000000
4831
4832 // This code is common to linux and solaris and will be moved to a
4833 // common place in dolphin.
4834 //
4835 // The passed in time value is either a relative time in nanoseconds
4836 // or an absolute time in milliseconds. Either way it has to be unpacked
4837 // into suitable seconds and nanoseconds components and stored in the
4838 // given timespec structure.
4839 // Given time is a 64-bit value and the time_t used in the timespec is only
4840 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4841 // overflow if times way in the future are given. Further on Solaris versions
4842 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4843 // number of seconds, in abstime, is less than current_time + 100,000,000.
4844 // As it will be 28 years before "now + 100000000" will overflow we can
4845 // ignore overflow and just impose a hard-limit on seconds using the value
4846 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4847 // years from "now".
4848 //
4849 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4850 assert(time > 0, "convertTime");
4851
4852 struct timeval now;
4853 int status = gettimeofday(&now, NULL);
4854 assert(status == 0, "gettimeofday");
4855
4856 time_t max_secs = now.tv_sec + MAX_SECS;
4857
4858 if (isAbsolute) {
4859 jlong secs = time / 1000;
4860 if (secs > max_secs) {
4861 absTime->tv_sec = max_secs;
4862 } else {
4863 absTime->tv_sec = secs;
4864 }
4865 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4866 } else {
4867 jlong secs = time / NANOSECS_PER_SEC;
4868 if (secs >= MAX_SECS) {
4869 absTime->tv_sec = max_secs;
4870 absTime->tv_nsec = 0;
4871 } else {
4872 absTime->tv_sec = now.tv_sec + secs;
4873 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4874 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4875 absTime->tv_nsec -= NANOSECS_PER_SEC;
4876 ++absTime->tv_sec; // note: this must be <= max_secs
4877 }
4878 }
4879 }
4880 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4881 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4882 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4883 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4884 }
4885
4886 void Parker::park(bool isAbsolute, jlong time) {
4887 // Ideally we'd do something useful while spinning, such
4888 // as calling unpackTime().
4889
4890 // Optional fast-path check:
4891 // Return immediately if a permit is available.
4892 // We depend on Atomic::xchg() having full barrier semantics
4893 // since we are doing a lock-free update to _counter.
4894 if (Atomic::xchg(&_counter, 0) > 0) return;
4895
4896 // Optional fast-exit: Check interrupt before trying to wait
4897 Thread* thread = Thread::current();
4898 assert(thread->is_Java_thread(), "Must be JavaThread");
4899 JavaThread *jt = (JavaThread *)thread;
4900 if (jt->is_interrupted(false)) {
4901 return;
4902 }
4903
4904 // First, demultiplex/decode time arguments
4905 timespec absTime;
4906 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4907 return;
4908 }
4909 if (time > 0) {
4910 // Warning: this code might be exposed to the old Solaris time
4911 // round-down bugs. Grep "roundingFix" for details.
4912 unpackTime(&absTime, isAbsolute, time);
4913 }
4914
4915 // Enter safepoint region
4916 // Beware of deadlocks such as 6317397.
4917 // The per-thread Parker:: _mutex is a classic leaf-lock.
4918 // In particular a thread must never block on the Threads_lock while
4919 // holding the Parker:: mutex. If safepoints are pending both the
4920 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4921 ThreadBlockInVM tbivm(jt);
4922
4923 // Can't access interrupt state now that we are _thread_blocked. If we've
4924 // been interrupted since we checked above then _counter will be > 0.
4925
4926 // Don't wait if cannot get lock since interference arises from
4927 // unblocking.
4928 if (os::Solaris::mutex_trylock(_mutex) != 0) {
4929 return;
4930 }
4931
4932 int status;
4933
4934 if (_counter > 0) { // no wait needed
4935 _counter = 0;
4936 status = os::Solaris::mutex_unlock(_mutex);
4937 assert(status == 0, "invariant");
4938 // Paranoia to ensure our locked and lock-free paths interact
4939 // correctly with each other and Java-level accesses.
4940 OrderAccess::fence();
4941 return;
4942 }
4943
4944 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4945 jt->set_suspend_equivalent();
4946 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4947
4948 // Do this the hard way by blocking ...
4949 // See http://monaco.sfbay/detail.jsf?cr=5094058.
4950 if (time == 0) {
4951 status = os::Solaris::cond_wait(_cond, _mutex);
4952 } else {
4953 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
4954 }
4955 // Note that an untimed cond_wait() can sometimes return ETIME on older
4956 // versions of the Solaris.
4957 assert_status(status == 0 || status == EINTR ||
4958 status == ETIME || status == ETIMEDOUT,
4959 status, "cond_timedwait");
4960
4961 _counter = 0;
4962 status = os::Solaris::mutex_unlock(_mutex);
4963 assert_status(status == 0, status, "mutex_unlock");
4964 // Paranoia to ensure our locked and lock-free paths interact
4965 // correctly with each other and Java-level accesses.
4966 OrderAccess::fence();
4967
4968 // If externally suspended while waiting, re-suspend
4969 if (jt->handle_special_suspend_equivalent_condition()) {
4970 jt->java_suspend_self();
4971 }
4972 }
4973
4974 void Parker::unpark() {
4975 int status = os::Solaris::mutex_lock(_mutex);
4976 assert(status == 0, "invariant");
4977 const int s = _counter;
4978 _counter = 1;
4979 status = os::Solaris::mutex_unlock(_mutex);
4980 assert(status == 0, "invariant");
4981
4982 if (s < 1) {
4983 status = os::Solaris::cond_signal(_cond);
4984 assert(status == 0, "invariant");
4985 }
4986 }
4987
4988 // Platform Mutex/Monitor implementations
4989
4990 os::PlatformMutex::PlatformMutex() {
4991 int status = os::Solaris::mutex_init(&_mutex);
4992 assert_status(status == 0, status, "mutex_init");
4993 }
4994
4995 os::PlatformMutex::~PlatformMutex() {
4996 int status = os::Solaris::mutex_destroy(&_mutex);
4997 assert_status(status == 0, status, "mutex_destroy");
4998 }
4999
5000 void os::PlatformMutex::lock() {
5001 int status = os::Solaris::mutex_lock(&_mutex);
5002 assert_status(status == 0, status, "mutex_lock");
5003 }
5004
5005 void os::PlatformMutex::unlock() {
5006 int status = os::Solaris::mutex_unlock(&_mutex);
5007 assert_status(status == 0, status, "mutex_unlock");
5008 }
5009
5010 bool os::PlatformMutex::try_lock() {
5011 int status = os::Solaris::mutex_trylock(&_mutex);
5012 assert_status(status == 0 || status == EBUSY, status, "mutex_trylock");
5013 return status == 0;
5014 }
5015
5016 os::PlatformMonitor::PlatformMonitor() {
5017 int status = os::Solaris::cond_init(&_cond);
5018 assert_status(status == 0, status, "cond_init");
5019 }
5020
5021 os::PlatformMonitor::~PlatformMonitor() {
5022 int status = os::Solaris::cond_destroy(&_cond);
5023 assert_status(status == 0, status, "cond_destroy");
5024 }
5025
5026 // Must already be locked
5027 int os::PlatformMonitor::wait(jlong millis) {
5028 assert(millis >= 0, "negative timeout");
5029 if (millis > 0) {
5030 timestruc_t abst;
5031 int ret = OS_TIMEOUT;
5032 compute_abstime(&abst, millis);
5033 int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst);
5034 assert_status(status == 0 || status == EINTR ||
5035 status == ETIME || status == ETIMEDOUT,
5036 status, "cond_timedwait");
5037 // EINTR acts as spurious wakeup - which is permitted anyway
5038 if (status == 0 || status == EINTR) {
5039 ret = OS_OK;
5040 }
5041 return ret;
5042 } else {
5043 int status = os::Solaris::cond_wait(&_cond, &_mutex);
5044 assert_status(status == 0 || status == EINTR,
5045 status, "cond_wait");
5046 return OS_OK;
5047 }
5048 }
5049
5050 void os::PlatformMonitor::notify() {
5051 int status = os::Solaris::cond_signal(&_cond);
5052 assert_status(status == 0, status, "cond_signal");
5053 }
5054
5055 void os::PlatformMonitor::notify_all() {
5056 int status = os::Solaris::cond_broadcast(&_cond);
5057 assert_status(status == 0, status, "cond_broadcast");
5058 }
5059
5060 extern char** environ;
5061
5062 // Run the specified command in a separate process. Return its exit value,
5063 // or -1 on failure (e.g. can't fork a new process).
5064 // Unlike system(), this function can be called from signal handler. It
5065 // doesn't block SIGINT et al.
5066 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
5067 char * argv[4];
5068 argv[0] = (char *)"sh";
5069 argv[1] = (char *)"-c";
5070 argv[2] = cmd;
5071 argv[3] = NULL;
5072
5073 // fork is async-safe, fork1 is not so can't use in signal handler
5074 pid_t pid;
5075 Thread* t = Thread::current_or_null_safe();
5076 if (t != NULL && t->is_inside_signal_handler()) {
5077 pid = fork();
5078 } else {
5079 pid = fork1();
5080 }
5081
5082 if (pid < 0) {
5083 // fork failed
5084 warning("fork failed: %s", os::strerror(errno));
5085 return -1;
5086
5087 } else if (pid == 0) {
5088 // child process
5089
5090 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5091 execve("/usr/bin/sh", argv, environ);
5092
5093 // execve failed
5094 _exit(-1);
5095
5096 } else {
5097 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5098 // care about the actual exit code, for now.
5099
5100 int status;
5101
5102 // Wait for the child process to exit. This returns immediately if
5103 // the child has already exited. */
5104 while (waitpid(pid, &status, 0) < 0) {
5105 switch (errno) {
5106 case ECHILD: return 0;
5107 case EINTR: break;
5108 default: return -1;
5109 }
5110 }
5111
5112 if (WIFEXITED(status)) {
5113 // The child exited normally; get its exit code.
5114 return WEXITSTATUS(status);
5115 } else if (WIFSIGNALED(status)) {
5116 // The child exited because of a signal
5117 // The best value to return is 0x80 + signal number,
5118 // because that is what all Unix shells do, and because
5119 // it allows callers to distinguish between process exit and
5120 // process death by signal.
5121 return 0x80 + WTERMSIG(status);
5122 } else {
5123 // Unknown exit code; pass it through
5124 return status;
5125 }
5126 }
5127 }
5128
5129 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5130 size_t res;
5131 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5132 return res;
5133 }
5134
5135 int os::close(int fd) {
5136 return ::close(fd);
5137 }
5138
5139 int os::socket_close(int fd) {
5140 return ::close(fd);
5141 }
5142
5143 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5144 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5145 "Assumed _thread_in_native");
5146 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5147 }
5148
5149 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5150 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5151 "Assumed _thread_in_native");
5152 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5153 }
5154
5155 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5156 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5157 }
5158
5159 // As both poll and select can be interrupted by signals, we have to be
5160 // prepared to restart the system call after updating the timeout, unless
5161 // a poll() is done with timeout == -1, in which case we repeat with this
5162 // "wait forever" value.
5163
5164 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5165 int _result;
5166 _result = ::connect(fd, him, len);
5167
5168 // On Solaris, when a connect() call is interrupted, the connection
5169 // can be established asynchronously (see 6343810). Subsequent calls
5170 // to connect() must check the errno value which has the semantic
5171 // described below (copied from the connect() man page). Handling
5172 // of asynchronously established connections is required for both
5173 // blocking and non-blocking sockets.
5174 // EINTR The connection attempt was interrupted
5175 // before any data arrived by the delivery of
5176 // a signal. The connection, however, will be
5177 // established asynchronously.
5178 //
5179 // EINPROGRESS The socket is non-blocking, and the connec-
5180 // tion cannot be completed immediately.
5181 //
5182 // EALREADY The socket is non-blocking, and a previous
5183 // connection attempt has not yet been com-
5184 // pleted.
5185 //
5186 // EISCONN The socket is already connected.
5187 if (_result == OS_ERR && errno == EINTR) {
5188 // restarting a connect() changes its errno semantics
5189 RESTARTABLE(::connect(fd, him, len), _result);
5190 // undo these changes
5191 if (_result == OS_ERR) {
5192 if (errno == EALREADY) {
5193 errno = EINPROGRESS; // fall through
5194 } else if (errno == EISCONN) {
5195 errno = 0;
5196 return OS_OK;
5197 }
5198 }
5199 }
5200 return _result;
5201 }
5202
5203 // Get the default path to the core file
5204 // Returns the length of the string
5205 int os::get_core_path(char* buffer, size_t bufferSize) {
5206 const char* p = get_current_directory(buffer, bufferSize);
5207
5208 if (p == NULL) {
5209 assert(p != NULL, "failed to get current directory");
5210 return 0;
5211 }
5212
5213 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5214 p, current_process_id());
5215
5216 return strlen(buffer);
5217 }
5218
5219 bool os::supports_map_sync() {
5220 return false;
5221 }
5222
5223 #ifndef PRODUCT
5224 void TestReserveMemorySpecial_test() {
5225 // No tests available for this platform
5226 }
5227 #endif
5228
5229 bool os::start_debugging(char *buf, int buflen) {
5230 int len = (int)strlen(buf);
5231 char *p = &buf[len];
5232
5233 jio_snprintf(p, buflen-len,
5234 "\n\n"
5235 "Do you want to debug the problem?\n\n"
5236 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5237 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5238 "Otherwise, press RETURN to abort...",
5239 os::current_process_id(), os::current_thread_id());
5240
5241 bool yes = os::message_box("Unexpected Error", buf);
5242
5243 if (yes) {
5244 // yes, user asked VM to launch debugger
5245 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5246
5247 os::fork_and_exec(buf);
5248 yes = false;
5249 }
5250 return yes;
5251 }