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