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