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