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