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 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
823 OSThread *osthread = thread->osthread();
824 osthread->set_caller_sigmask(sigmask);
825
826 thr_sigsetmask(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 thr_sigsetmask(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 thr_sigsetmask(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 thr_sigsetmask(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, 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 void os::print_siginfo(outputStream* st, void* siginfo) {
1910 const siginfo_t* si = (const siginfo_t*)siginfo;
1911
1912 os::Posix::print_siginfo_brief(st, si);
1913
1914 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
1915 UseSharedSpaces) {
1916 FileMapInfo* mapinfo = FileMapInfo::current_info();
1917 if (mapinfo->is_in_shared_space(si->si_addr)) {
1918 st->print("\n\nError accessing class data sharing archive." \
1919 " Mapped file inaccessible during execution, " \
1920 " possible disk/network problem.");
1921 }
1922 }
1923 st->cr();
1924 }
1925
1926 // Moved from whole group, because we need them here for diagnostic
1927 // prints.
1928 #define OLDMAXSIGNUM 32
1929 static int Maxsignum = 0;
1930 static int *ourSigFlags = NULL;
1931
1932 int os::Solaris::get_our_sigflags(int sig) {
1933 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1934 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1935 return ourSigFlags[sig];
1936 }
1937
1938 void os::Solaris::set_our_sigflags(int sig, int flags) {
1939 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1940 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1941 ourSigFlags[sig] = flags;
1942 }
1943
1944
1945 static const char* get_signal_handler_name(address handler,
1946 char* buf, int buflen) {
1947 int offset;
1948 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1949 if (found) {
1950 // skip directory names
1951 const char *p1, *p2;
1952 p1 = buf;
1953 size_t len = strlen(os::file_separator());
1954 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1955 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1956 } else {
1957 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1958 }
1959 return buf;
1960 }
1961
1962 static void print_signal_handler(outputStream* st, int sig,
1963 char* buf, size_t buflen) {
1964 struct sigaction sa;
1965
1966 sigaction(sig, NULL, &sa);
1967
1968 st->print("%s: ", os::exception_name(sig, buf, buflen));
1969
1970 address handler = (sa.sa_flags & SA_SIGINFO)
1971 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1972 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1973
1974 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1975 st->print("SIG_DFL");
1976 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1977 st->print("SIG_IGN");
1978 } else {
1979 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1980 }
1981
1982 st->print(", sa_mask[0]=");
1983 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1984
1985 address rh = VMError::get_resetted_sighandler(sig);
1986 // May be, handler was resetted by VMError?
1987 if (rh != NULL) {
1988 handler = rh;
1989 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1990 }
1991
1992 st->print(", sa_flags=");
1993 os::Posix::print_sa_flags(st, sa.sa_flags);
1994
1995 // Check: is it our handler?
1996 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1997 // It is our signal handler
1998 // check for flags
1999 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2000 st->print(
2001 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2002 os::Solaris::get_our_sigflags(sig));
2003 }
2004 }
2005 st->cr();
2006 }
2007
2008 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2009 st->print_cr("Signal Handlers:");
2010 print_signal_handler(st, SIGSEGV, buf, buflen);
2011 print_signal_handler(st, SIGBUS , buf, buflen);
2012 print_signal_handler(st, SIGFPE , buf, buflen);
2013 print_signal_handler(st, SIGPIPE, buf, buflen);
2014 print_signal_handler(st, SIGXFSZ, buf, buflen);
2015 print_signal_handler(st, SIGILL , buf, buflen);
2016 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2017 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2018 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2019 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2020 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2021 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2022 }
2023
2024 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2025
2026 // Find the full path to the current module, libjvm.so
2027 void os::jvm_path(char *buf, jint buflen) {
2028 // Error checking.
2029 if (buflen < MAXPATHLEN) {
2030 assert(false, "must use a large-enough buffer");
2031 buf[0] = '\0';
2032 return;
2033 }
2034 // Lazy resolve the path to current module.
2035 if (saved_jvm_path[0] != 0) {
2036 strcpy(buf, saved_jvm_path);
2037 return;
2038 }
2039
2040 Dl_info dlinfo;
2041 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2042 assert(ret != 0, "cannot locate libjvm");
2043 if (ret != 0 && dlinfo.dli_fname != NULL) {
2044 realpath((char *)dlinfo.dli_fname, buf);
2045 } else {
2046 buf[0] = '\0';
2047 return;
2048 }
2049
2050 if (Arguments::sun_java_launcher_is_altjvm()) {
2051 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2052 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2053 // If "/jre/lib/" appears at the right place in the string, then
2054 // assume we are installed in a JDK and we're done. Otherwise, check
2055 // for a JAVA_HOME environment variable and fix up the path so it
2056 // looks like libjvm.so is installed there (append a fake suffix
2057 // hotspot/libjvm.so).
2058 const char *p = buf + strlen(buf) - 1;
2059 for (int count = 0; p > buf && count < 5; ++count) {
2060 for (--p; p > buf && *p != '/'; --p)
2061 /* empty */ ;
2062 }
2063
2064 if (strncmp(p, "/jre/lib/", 9) != 0) {
2065 // Look for JAVA_HOME in the environment.
2066 char* java_home_var = ::getenv("JAVA_HOME");
2067 if (java_home_var != NULL && java_home_var[0] != 0) {
2068 char cpu_arch[12];
2069 char* jrelib_p;
2070 int len;
2071 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2072 #ifdef _LP64
2073 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2074 if (strcmp(cpu_arch, "sparc") == 0) {
2075 strcat(cpu_arch, "v9");
2076 } else if (strcmp(cpu_arch, "i386") == 0) {
2077 strcpy(cpu_arch, "amd64");
2078 }
2079 #endif
2080 // Check the current module name "libjvm.so".
2081 p = strrchr(buf, '/');
2082 assert(strstr(p, "/libjvm") == p, "invalid library name");
2083
2084 realpath(java_home_var, buf);
2085 // determine if this is a legacy image or modules image
2086 // modules image doesn't have "jre" subdirectory
2087 len = strlen(buf);
2088 assert(len < buflen, "Ran out of buffer space");
2089 jrelib_p = buf + len;
2090 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2091 if (0 != access(buf, F_OK)) {
2092 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2093 }
2094
2095 if (0 == access(buf, F_OK)) {
2096 // Use current module name "libjvm.so"
2097 len = strlen(buf);
2098 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2099 } else {
2100 // Go back to path of .so
2101 realpath((char *)dlinfo.dli_fname, buf);
2102 }
2103 }
2104 }
2105 }
2106
2107 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2108 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2109 }
2110
2111
2112 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2113 // no prefix required, not even "_"
2114 }
2115
2116
2117 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2118 // no suffix required
2119 }
2120
2121 // This method is a copy of JDK's sysGetLastErrorString
2122 // from src/solaris/hpi/src/system_md.c
2123
2124 size_t os::lasterror(char *buf, size_t len) {
2125 if (errno == 0) return 0;
2126
2127 const char *s = ::strerror(errno);
2128 size_t n = ::strlen(s);
2129 if (n >= len) {
2130 n = len - 1;
2131 }
2132 ::strncpy(buf, s, n);
2133 buf[n] = '\0';
2134 return n;
2135 }
2136
2137
2138 // sun.misc.Signal
2139
2140 extern "C" {
2141 static void UserHandler(int sig, void *siginfo, void *context) {
2142 // Ctrl-C is pressed during error reporting, likely because the error
2143 // handler fails to abort. Let VM die immediately.
2144 if (sig == SIGINT && is_error_reported()) {
2145 os::die();
2146 }
2147
2148 os::signal_notify(sig);
2149 // We do not need to reinstate the signal handler each time...
2150 }
2151 }
2152
2153 void* os::user_handler() {
2154 return CAST_FROM_FN_PTR(void*, UserHandler);
2155 }
2156
2157 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2158 struct timespec ts;
2159 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2160
2161 return ts;
2162 }
2163
2164 extern "C" {
2165 typedef void (*sa_handler_t)(int);
2166 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2167 }
2168
2169 void* os::signal(int signal_number, void* handler) {
2170 struct sigaction sigAct, oldSigAct;
2171 sigfillset(&(sigAct.sa_mask));
2172 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2173 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2174
2175 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2176 // -1 means registration failed
2177 return (void *)-1;
2178 }
2179
2180 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2181 }
2182
2183 void os::signal_raise(int signal_number) {
2184 raise(signal_number);
2185 }
2186
2187 // The following code is moved from os.cpp for making this
2188 // code platform specific, which it is by its very nature.
2189
2190 // a counter for each possible signal value
2191 static int Sigexit = 0;
2192 static int Maxlibjsigsigs;
2193 static jint *pending_signals = NULL;
2194 static int *preinstalled_sigs = NULL;
2195 static struct sigaction *chainedsigactions = NULL;
2196 static sema_t sig_sem;
2197 typedef int (*version_getting_t)();
2198 version_getting_t os::Solaris::get_libjsig_version = NULL;
2199 static int libjsigversion = NULL;
2200
2201 int os::sigexitnum_pd() {
2202 assert(Sigexit > 0, "signal memory not yet initialized");
2203 return Sigexit;
2204 }
2205
2206 void os::Solaris::init_signal_mem() {
2207 // Initialize signal structures
2208 Maxsignum = SIGRTMAX;
2209 Sigexit = Maxsignum+1;
2210 assert(Maxsignum >0, "Unable to obtain max signal number");
2211
2212 Maxlibjsigsigs = Maxsignum;
2213
2214 // pending_signals has one int per signal
2215 // The additional signal is for SIGEXIT - exit signal to signal_thread
2216 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2217 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2218
2219 if (UseSignalChaining) {
2220 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2221 * (Maxsignum + 1), mtInternal);
2222 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2223 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2224 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2225 }
2226 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2227 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2228 }
2229
2230 void os::signal_init_pd() {
2231 int ret;
2232
2233 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2234 assert(ret == 0, "sema_init() failed");
2235 }
2236
2237 void os::signal_notify(int signal_number) {
2238 int ret;
2239
2240 Atomic::inc(&pending_signals[signal_number]);
2241 ret = ::sema_post(&sig_sem);
2242 assert(ret == 0, "sema_post() failed");
2243 }
2244
2245 static int check_pending_signals(bool wait_for_signal) {
2246 int ret;
2247 while (true) {
2248 for (int i = 0; i < Sigexit + 1; i++) {
2249 jint n = pending_signals[i];
2250 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2251 return i;
2252 }
2253 }
2254 if (!wait_for_signal) {
2255 return -1;
2256 }
2257 JavaThread *thread = JavaThread::current();
2258 ThreadBlockInVM tbivm(thread);
2259
2260 bool threadIsSuspended;
2261 do {
2262 thread->set_suspend_equivalent();
2263 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2264 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2265 ;
2266 assert(ret == 0, "sema_wait() failed");
2267
2268 // were we externally suspended while we were waiting?
2269 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2270 if (threadIsSuspended) {
2271 // The semaphore has been incremented, but while we were waiting
2272 // another thread suspended us. We don't want to continue running
2273 // while suspended because that would surprise the thread that
2274 // suspended us.
2275 ret = ::sema_post(&sig_sem);
2276 assert(ret == 0, "sema_post() failed");
2277
2278 thread->java_suspend_self();
2279 }
2280 } while (threadIsSuspended);
2281 }
2282 }
2283
2284 int os::signal_lookup() {
2285 return check_pending_signals(false);
2286 }
2287
2288 int os::signal_wait() {
2289 return check_pending_signals(true);
2290 }
2291
2292 ////////////////////////////////////////////////////////////////////////////////
2293 // Virtual Memory
2294
2295 static int page_size = -1;
2296
2297 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2298 // clear this var if support is not available.
2299 static bool has_map_align = true;
2300
2301 int os::vm_page_size() {
2302 assert(page_size != -1, "must call os::init");
2303 return page_size;
2304 }
2305
2306 // Solaris allocates memory by pages.
2307 int os::vm_allocation_granularity() {
2308 assert(page_size != -1, "must call os::init");
2309 return page_size;
2310 }
2311
2312 static bool recoverable_mmap_error(int err) {
2313 // See if the error is one we can let the caller handle. This
2314 // list of errno values comes from the Solaris mmap(2) man page.
2315 switch (err) {
2316 case EBADF:
2317 case EINVAL:
2318 case ENOTSUP:
2319 // let the caller deal with these errors
2320 return true;
2321
2322 default:
2323 // Any remaining errors on this OS can cause our reserved mapping
2324 // to be lost. That can cause confusion where different data
2325 // structures think they have the same memory mapped. The worst
2326 // scenario is if both the VM and a library think they have the
2327 // same memory mapped.
2328 return false;
2329 }
2330 }
2331
2332 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2333 int err) {
2334 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2335 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2336 strerror(err), err);
2337 }
2338
2339 static void warn_fail_commit_memory(char* addr, size_t bytes,
2340 size_t alignment_hint, bool exec,
2341 int err) {
2342 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2343 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2344 alignment_hint, exec, strerror(err), err);
2345 }
2346
2347 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2348 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2349 size_t size = bytes;
2350 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2351 if (res != NULL) {
2352 if (UseNUMAInterleaving) {
2353 numa_make_global(addr, bytes);
2354 }
2355 return 0;
2356 }
2357
2358 int err = errno; // save errno from mmap() call in mmap_chunk()
2359
2360 if (!recoverable_mmap_error(err)) {
2361 warn_fail_commit_memory(addr, bytes, exec, err);
2362 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2363 }
2364
2365 return err;
2366 }
2367
2368 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2369 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2370 }
2371
2372 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2373 const char* mesg) {
2374 assert(mesg != NULL, "mesg must be specified");
2375 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2376 if (err != 0) {
2377 // the caller wants all commit errors to exit with the specified mesg:
2378 warn_fail_commit_memory(addr, bytes, exec, err);
2379 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2380 }
2381 }
2382
2383 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2384 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2385 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2386 alignment, (size_t) vm_page_size());
2387
2388 for (int i = 0; _page_sizes[i] != 0; i++) {
2389 if (is_size_aligned(alignment, _page_sizes[i])) {
2390 return _page_sizes[i];
2391 }
2392 }
2393
2394 return (size_t) vm_page_size();
2395 }
2396
2397 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2398 size_t alignment_hint, bool exec) {
2399 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2400 if (err == 0 && UseLargePages && alignment_hint > 0) {
2401 assert(is_size_aligned(bytes, alignment_hint),
2402 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2403
2404 // The syscall memcntl requires an exact page size (see man memcntl for details).
2405 size_t page_size = page_size_for_alignment(alignment_hint);
2406 if (page_size > (size_t) vm_page_size()) {
2407 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2408 }
2409 }
2410 return err;
2411 }
2412
2413 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2414 bool exec) {
2415 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2416 }
2417
2418 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2419 size_t alignment_hint, bool exec,
2420 const char* mesg) {
2421 assert(mesg != NULL, "mesg must be specified");
2422 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2423 if (err != 0) {
2424 // the caller wants all commit errors to exit with the specified mesg:
2425 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2426 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2427 }
2428 }
2429
2430 // Uncommit the pages in a specified region.
2431 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2432 if (madvise(addr, bytes, MADV_FREE) < 0) {
2433 debug_only(warning("MADV_FREE failed."));
2434 return;
2435 }
2436 }
2437
2438 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2439 return os::commit_memory(addr, size, !ExecMem);
2440 }
2441
2442 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2443 return os::uncommit_memory(addr, size);
2444 }
2445
2446 // Change the page size in a given range.
2447 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2448 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2449 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2450 if (UseLargePages) {
2451 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2452 if (page_size > (size_t) vm_page_size()) {
2453 Solaris::setup_large_pages(addr, bytes, page_size);
2454 }
2455 }
2456 }
2457
2458 // Tell the OS to make the range local to the first-touching LWP
2459 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2460 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2461 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2462 debug_only(warning("MADV_ACCESS_LWP failed."));
2463 }
2464 }
2465
2466 // Tell the OS that this range would be accessed from different LWPs.
2467 void os::numa_make_global(char *addr, size_t bytes) {
2468 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2469 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2470 debug_only(warning("MADV_ACCESS_MANY failed."));
2471 }
2472 }
2473
2474 // Get the number of the locality groups.
2475 size_t os::numa_get_groups_num() {
2476 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2477 return n != -1 ? n : 1;
2478 }
2479
2480 // Get a list of leaf locality groups. A leaf lgroup is group that
2481 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2482 // board. An LWP is assigned to one of these groups upon creation.
2483 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2484 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2485 ids[0] = 0;
2486 return 1;
2487 }
2488 int result_size = 0, top = 1, bottom = 0, cur = 0;
2489 for (int k = 0; k < size; k++) {
2490 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2491 (Solaris::lgrp_id_t*)&ids[top], size - top);
2492 if (r == -1) {
2493 ids[0] = 0;
2494 return 1;
2495 }
2496 if (!r) {
2497 // That's a leaf node.
2498 assert(bottom <= cur, "Sanity check");
2499 // Check if the node has memory
2500 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2501 NULL, 0, LGRP_RSRC_MEM) > 0) {
2502 ids[bottom++] = ids[cur];
2503 }
2504 }
2505 top += r;
2506 cur++;
2507 }
2508 if (bottom == 0) {
2509 // Handle a situation, when the OS reports no memory available.
2510 // Assume UMA architecture.
2511 ids[0] = 0;
2512 return 1;
2513 }
2514 return bottom;
2515 }
2516
2517 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2518 bool os::numa_topology_changed() {
2519 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2520 if (is_stale != -1 && is_stale) {
2521 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2522 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2523 assert(c != 0, "Failure to initialize LGRP API");
2524 Solaris::set_lgrp_cookie(c);
2525 return true;
2526 }
2527 return false;
2528 }
2529
2530 // Get the group id of the current LWP.
2531 int os::numa_get_group_id() {
2532 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2533 if (lgrp_id == -1) {
2534 return 0;
2535 }
2536 const int size = os::numa_get_groups_num();
2537 int *ids = (int*)alloca(size * sizeof(int));
2538
2539 // Get the ids of all lgroups with memory; r is the count.
2540 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2541 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2542 if (r <= 0) {
2543 return 0;
2544 }
2545 return ids[os::random() % r];
2546 }
2547
2548 // Request information about the page.
2549 bool os::get_page_info(char *start, page_info* info) {
2550 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2551 uint64_t addr = (uintptr_t)start;
2552 uint64_t outdata[2];
2553 uint_t validity = 0;
2554
2555 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2556 return false;
2557 }
2558
2559 info->size = 0;
2560 info->lgrp_id = -1;
2561
2562 if ((validity & 1) != 0) {
2563 if ((validity & 2) != 0) {
2564 info->lgrp_id = outdata[0];
2565 }
2566 if ((validity & 4) != 0) {
2567 info->size = outdata[1];
2568 }
2569 return true;
2570 }
2571 return false;
2572 }
2573
2574 // Scan the pages from start to end until a page different than
2575 // the one described in the info parameter is encountered.
2576 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2577 page_info* page_found) {
2578 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2579 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2580 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2581 uint_t validity[MAX_MEMINFO_CNT];
2582
2583 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2584 uint64_t p = (uint64_t)start;
2585 while (p < (uint64_t)end) {
2586 addrs[0] = p;
2587 size_t addrs_count = 1;
2588 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2589 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2590 addrs_count++;
2591 }
2592
2593 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2594 return NULL;
2595 }
2596
2597 size_t i = 0;
2598 for (; i < addrs_count; i++) {
2599 if ((validity[i] & 1) != 0) {
2600 if ((validity[i] & 4) != 0) {
2601 if (outdata[types * i + 1] != page_expected->size) {
2602 break;
2603 }
2604 } else if (page_expected->size != 0) {
2605 break;
2606 }
2607
2608 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2609 if (outdata[types * i] != page_expected->lgrp_id) {
2610 break;
2611 }
2612 }
2613 } else {
2614 return NULL;
2615 }
2616 }
2617
2618 if (i < addrs_count) {
2619 if ((validity[i] & 2) != 0) {
2620 page_found->lgrp_id = outdata[types * i];
2621 } else {
2622 page_found->lgrp_id = -1;
2623 }
2624 if ((validity[i] & 4) != 0) {
2625 page_found->size = outdata[types * i + 1];
2626 } else {
2627 page_found->size = 0;
2628 }
2629 return (char*)addrs[i];
2630 }
2631
2632 p = addrs[addrs_count - 1] + page_size;
2633 }
2634 return end;
2635 }
2636
2637 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2638 size_t size = bytes;
2639 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2640 // uncommitted page. Otherwise, the read/write might succeed if we
2641 // have enough swap space to back the physical page.
2642 return
2643 NULL != Solaris::mmap_chunk(addr, size,
2644 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2645 PROT_NONE);
2646 }
2647
2648 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2649 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2650
2651 if (b == MAP_FAILED) {
2652 return NULL;
2653 }
2654 return b;
2655 }
2656
2657 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2658 size_t alignment_hint, bool fixed) {
2659 char* addr = requested_addr;
2660 int flags = MAP_PRIVATE | MAP_NORESERVE;
2661
2662 assert(!(fixed && (alignment_hint > 0)),
2663 "alignment hint meaningless with fixed mmap");
2664
2665 if (fixed) {
2666 flags |= MAP_FIXED;
2667 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2668 flags |= MAP_ALIGN;
2669 addr = (char*) alignment_hint;
2670 }
2671
2672 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2673 // uncommitted page. Otherwise, the read/write might succeed if we
2674 // have enough swap space to back the physical page.
2675 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2676 }
2677
2678 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2679 size_t alignment_hint) {
2680 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2681 (requested_addr != NULL));
2682
2683 guarantee(requested_addr == NULL || requested_addr == addr,
2684 "OS failed to return requested mmap address.");
2685 return addr;
2686 }
2687
2688 // Reserve memory at an arbitrary address, only if that area is
2689 // available (and not reserved for something else).
2690
2691 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2692 const int max_tries = 10;
2693 char* base[max_tries];
2694 size_t size[max_tries];
2695
2696 // Solaris adds a gap between mmap'ed regions. The size of the gap
2697 // is dependent on the requested size and the MMU. Our initial gap
2698 // value here is just a guess and will be corrected later.
2699 bool had_top_overlap = false;
2700 bool have_adjusted_gap = false;
2701 size_t gap = 0x400000;
2702
2703 // Assert only that the size is a multiple of the page size, since
2704 // that's all that mmap requires, and since that's all we really know
2705 // about at this low abstraction level. If we need higher alignment,
2706 // we can either pass an alignment to this method or verify alignment
2707 // in one of the methods further up the call chain. See bug 5044738.
2708 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2709
2710 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2711 // Give it a try, if the kernel honors the hint we can return immediately.
2712 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2713
2714 volatile int err = errno;
2715 if (addr == requested_addr) {
2716 return addr;
2717 } else if (addr != NULL) {
2718 pd_unmap_memory(addr, bytes);
2719 }
2720
2721 if (PrintMiscellaneous && Verbose) {
2722 char buf[256];
2723 buf[0] = '\0';
2724 if (addr == NULL) {
2725 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2726 }
2727 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2728 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2729 "%s", bytes, requested_addr, addr, buf);
2730 }
2731
2732 // Address hint method didn't work. Fall back to the old method.
2733 // In theory, once SNV becomes our oldest supported platform, this
2734 // code will no longer be needed.
2735 //
2736 // Repeatedly allocate blocks until the block is allocated at the
2737 // right spot. Give up after max_tries.
2738 int i;
2739 for (i = 0; i < max_tries; ++i) {
2740 base[i] = reserve_memory(bytes);
2741
2742 if (base[i] != NULL) {
2743 // Is this the block we wanted?
2744 if (base[i] == requested_addr) {
2745 size[i] = bytes;
2746 break;
2747 }
2748
2749 // check that the gap value is right
2750 if (had_top_overlap && !have_adjusted_gap) {
2751 size_t actual_gap = base[i-1] - base[i] - bytes;
2752 if (gap != actual_gap) {
2753 // adjust the gap value and retry the last 2 allocations
2754 assert(i > 0, "gap adjustment code problem");
2755 have_adjusted_gap = true; // adjust the gap only once, just in case
2756 gap = actual_gap;
2757 if (PrintMiscellaneous && Verbose) {
2758 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2759 }
2760 unmap_memory(base[i], bytes);
2761 unmap_memory(base[i-1], size[i-1]);
2762 i-=2;
2763 continue;
2764 }
2765 }
2766
2767 // Does this overlap the block we wanted? Give back the overlapped
2768 // parts and try again.
2769 //
2770 // There is still a bug in this code: if top_overlap == bytes,
2771 // the overlap is offset from requested region by the value of gap.
2772 // In this case giving back the overlapped part will not work,
2773 // because we'll give back the entire block at base[i] and
2774 // therefore the subsequent allocation will not generate a new gap.
2775 // This could be fixed with a new algorithm that used larger
2776 // or variable size chunks to find the requested region -
2777 // but such a change would introduce additional complications.
2778 // It's rare enough that the planets align for this bug,
2779 // so we'll just wait for a fix for 6204603/5003415 which
2780 // will provide a mmap flag to allow us to avoid this business.
2781
2782 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2783 if (top_overlap >= 0 && top_overlap < bytes) {
2784 had_top_overlap = true;
2785 unmap_memory(base[i], top_overlap);
2786 base[i] += top_overlap;
2787 size[i] = bytes - top_overlap;
2788 } else {
2789 size_t bottom_overlap = base[i] + bytes - requested_addr;
2790 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2791 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2792 warning("attempt_reserve_memory_at: possible alignment bug");
2793 }
2794 unmap_memory(requested_addr, bottom_overlap);
2795 size[i] = bytes - bottom_overlap;
2796 } else {
2797 size[i] = bytes;
2798 }
2799 }
2800 }
2801 }
2802
2803 // Give back the unused reserved pieces.
2804
2805 for (int j = 0; j < i; ++j) {
2806 if (base[j] != NULL) {
2807 unmap_memory(base[j], size[j]);
2808 }
2809 }
2810
2811 return (i < max_tries) ? requested_addr : NULL;
2812 }
2813
2814 bool os::pd_release_memory(char* addr, size_t bytes) {
2815 size_t size = bytes;
2816 return munmap(addr, size) == 0;
2817 }
2818
2819 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2820 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2821 "addr must be page aligned");
2822 int retVal = mprotect(addr, bytes, prot);
2823 return retVal == 0;
2824 }
2825
2826 // Protect memory (Used to pass readonly pages through
2827 // JNI GetArray<type>Elements with empty arrays.)
2828 // Also, used for serialization page and for compressed oops null pointer
2829 // checking.
2830 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2831 bool is_committed) {
2832 unsigned int p = 0;
2833 switch (prot) {
2834 case MEM_PROT_NONE: p = PROT_NONE; break;
2835 case MEM_PROT_READ: p = PROT_READ; break;
2836 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2837 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2838 default:
2839 ShouldNotReachHere();
2840 }
2841 // is_committed is unused.
2842 return solaris_mprotect(addr, bytes, p);
2843 }
2844
2845 // guard_memory and unguard_memory only happens within stack guard pages.
2846 // Since ISM pertains only to the heap, guard and unguard memory should not
2847 /// happen with an ISM region.
2848 bool os::guard_memory(char* addr, size_t bytes) {
2849 return solaris_mprotect(addr, bytes, PROT_NONE);
2850 }
2851
2852 bool os::unguard_memory(char* addr, size_t bytes) {
2853 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2854 }
2855
2856 // Large page support
2857 static size_t _large_page_size = 0;
2858
2859 // Insertion sort for small arrays (descending order).
2860 static void insertion_sort_descending(size_t* array, int len) {
2861 for (int i = 0; i < len; i++) {
2862 size_t val = array[i];
2863 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2864 size_t tmp = array[key];
2865 array[key] = array[key - 1];
2866 array[key - 1] = tmp;
2867 }
2868 }
2869 }
2870
2871 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2872 const unsigned int usable_count = VM_Version::page_size_count();
2873 if (usable_count == 1) {
2874 return false;
2875 }
2876
2877 // Find the right getpagesizes interface. When solaris 11 is the minimum
2878 // build platform, getpagesizes() (without the '2') can be called directly.
2879 typedef int (*gps_t)(size_t[], int);
2880 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2881 if (gps_func == NULL) {
2882 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2883 if (gps_func == NULL) {
2884 if (warn) {
2885 warning("MPSS is not supported by the operating system.");
2886 }
2887 return false;
2888 }
2889 }
2890
2891 // Fill the array of page sizes.
2892 int n = (*gps_func)(_page_sizes, page_sizes_max);
2893 assert(n > 0, "Solaris bug?");
2894
2895 if (n == page_sizes_max) {
2896 // Add a sentinel value (necessary only if the array was completely filled
2897 // since it is static (zeroed at initialization)).
2898 _page_sizes[--n] = 0;
2899 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2900 }
2901 assert(_page_sizes[n] == 0, "missing sentinel");
2902 trace_page_sizes("available page sizes", _page_sizes, n);
2903
2904 if (n == 1) return false; // Only one page size available.
2905
2906 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2907 // select up to usable_count elements. First sort the array, find the first
2908 // acceptable value, then copy the usable sizes to the top of the array and
2909 // trim the rest. Make sure to include the default page size :-).
2910 //
2911 // A better policy could get rid of the 4M limit by taking the sizes of the
2912 // important VM memory regions (java heap and possibly the code cache) into
2913 // account.
2914 insertion_sort_descending(_page_sizes, n);
2915 const size_t size_limit =
2916 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2917 int beg;
2918 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2919 const int end = MIN2((int)usable_count, n) - 1;
2920 for (int cur = 0; cur < end; ++cur, ++beg) {
2921 _page_sizes[cur] = _page_sizes[beg];
2922 }
2923 _page_sizes[end] = vm_page_size();
2924 _page_sizes[end + 1] = 0;
2925
2926 if (_page_sizes[end] > _page_sizes[end - 1]) {
2927 // Default page size is not the smallest; sort again.
2928 insertion_sort_descending(_page_sizes, end + 1);
2929 }
2930 *page_size = _page_sizes[0];
2931
2932 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2933 return true;
2934 }
2935
2936 void os::large_page_init() {
2937 if (UseLargePages) {
2938 // print a warning if any large page related flag is specified on command line
2939 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2940 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2941
2942 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2943 }
2944 }
2945
2946 bool os::Solaris::is_valid_page_size(size_t bytes) {
2947 for (int i = 0; _page_sizes[i] != 0; i++) {
2948 if (_page_sizes[i] == bytes) {
2949 return true;
2950 }
2951 }
2952 return false;
2953 }
2954
2955 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2956 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2957 assert(is_ptr_aligned((void*) start, align),
2958 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2959 assert(is_size_aligned(bytes, align),
2960 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2961
2962 // Signal to OS that we want large pages for addresses
2963 // from addr, addr + bytes
2964 struct memcntl_mha mpss_struct;
2965 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2966 mpss_struct.mha_pagesize = align;
2967 mpss_struct.mha_flags = 0;
2968 // Upon successful completion, memcntl() returns 0
2969 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2970 debug_only(warning("Attempt to use MPSS failed."));
2971 return false;
2972 }
2973 return true;
2974 }
2975
2976 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2977 fatal("os::reserve_memory_special should not be called on Solaris.");
2978 return NULL;
2979 }
2980
2981 bool os::release_memory_special(char* base, size_t bytes) {
2982 fatal("os::release_memory_special should not be called on Solaris.");
2983 return false;
2984 }
2985
2986 size_t os::large_page_size() {
2987 return _large_page_size;
2988 }
2989
2990 // MPSS allows application to commit large page memory on demand; with ISM
2991 // the entire memory region must be allocated as shared memory.
2992 bool os::can_commit_large_page_memory() {
2993 return true;
2994 }
2995
2996 bool os::can_execute_large_page_memory() {
2997 return true;
2998 }
2999
3000 // Read calls from inside the vm need to perform state transitions
3001 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3002 size_t res;
3003 JavaThread* thread = (JavaThread*)Thread::current();
3004 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3005 ThreadBlockInVM tbiv(thread);
3006 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3007 return res;
3008 }
3009
3010 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
3011 size_t res;
3012 JavaThread* thread = (JavaThread*)Thread::current();
3013 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3014 ThreadBlockInVM tbiv(thread);
3015 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
3016 return res;
3017 }
3018
3019 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3020 size_t res;
3021 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3022 "Assumed _thread_in_native");
3023 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3024 return res;
3025 }
3026
3027 void os::naked_short_sleep(jlong ms) {
3028 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3029
3030 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3031 // Solaris requires -lrt for this.
3032 usleep((ms * 1000));
3033
3034 return;
3035 }
3036
3037 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3038 void os::infinite_sleep() {
3039 while (true) { // sleep forever ...
3040 ::sleep(100); // ... 100 seconds at a time
3041 }
3042 }
3043
3044 // Used to convert frequent JVM_Yield() to nops
3045 bool os::dont_yield() {
3046 if (DontYieldALot) {
3047 static hrtime_t last_time = 0;
3048 hrtime_t diff = getTimeNanos() - last_time;
3049
3050 if (diff < DontYieldALotInterval * 1000000) {
3051 return true;
3052 }
3053
3054 last_time += diff;
3055
3056 return false;
3057 } else {
3058 return false;
3059 }
3060 }
3061
3062 // Note that yield semantics are defined by the scheduling class to which
3063 // the thread currently belongs. Typically, yield will _not yield to
3064 // other equal or higher priority threads that reside on the dispatch queues
3065 // of other CPUs.
3066
3067 void os::naked_yield() {
3068 thr_yield();
3069 }
3070
3071 // Interface for setting lwp priorities. If we are using T2 libthread,
3072 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3073 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3074 // function is meaningless in this mode so we must adjust the real lwp's priority
3075 // The routines below implement the getting and setting of lwp priorities.
3076 //
3077 // Note: T2 is now the only supported libthread. UseBoundThreads flag is
3078 // being deprecated and all threads are now BoundThreads
3079 //
3080 // Note: There are three priority scales used on Solaris. Java priotities
3081 // which range from 1 to 10, libthread "thr_setprio" scale which range
3082 // from 0 to 127, and the current scheduling class of the process we
3083 // are running in. This is typically from -60 to +60.
3084 // The setting of the lwp priorities in done after a call to thr_setprio
3085 // so Java priorities are mapped to libthread priorities and we map from
3086 // the latter to lwp priorities. We don't keep priorities stored in
3087 // Java priorities since some of our worker threads want to set priorities
3088 // higher than all Java threads.
3089 //
3090 // For related information:
3091 // (1) man -s 2 priocntl
3092 // (2) man -s 4 priocntl
3093 // (3) man dispadmin
3094 // = librt.so
3095 // = libthread/common/rtsched.c - thrp_setlwpprio().
3096 // = ps -cL <pid> ... to validate priority.
3097 // = sched_get_priority_min and _max
3098 // pthread_create
3099 // sched_setparam
3100 // pthread_setschedparam
3101 //
3102 // Assumptions:
3103 // + We assume that all threads in the process belong to the same
3104 // scheduling class. IE. an homogenous process.
3105 // + Must be root or in IA group to change change "interactive" attribute.
3106 // Priocntl() will fail silently. The only indication of failure is when
3107 // we read-back the value and notice that it hasn't changed.
3108 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3109 // + For RT, change timeslice as well. Invariant:
3110 // constant "priority integral"
3111 // Konst == TimeSlice * (60-Priority)
3112 // Given a priority, compute appropriate timeslice.
3113 // + Higher numerical values have higher priority.
3114
3115 // sched class attributes
3116 typedef struct {
3117 int schedPolicy; // classID
3118 int maxPrio;
3119 int minPrio;
3120 } SchedInfo;
3121
3122
3123 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3124
3125 #ifdef ASSERT
3126 static int ReadBackValidate = 1;
3127 #endif
3128 static int myClass = 0;
3129 static int myMin = 0;
3130 static int myMax = 0;
3131 static int myCur = 0;
3132 static bool priocntl_enable = false;
3133
3134 static const int criticalPrio = FXCriticalPriority;
3135 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3136
3137
3138 // lwp_priocntl_init
3139 //
3140 // Try to determine the priority scale for our process.
3141 //
3142 // Return errno or 0 if OK.
3143 //
3144 static int lwp_priocntl_init() {
3145 int rslt;
3146 pcinfo_t ClassInfo;
3147 pcparms_t ParmInfo;
3148 int i;
3149
3150 if (!UseThreadPriorities) return 0;
3151
3152 // If ThreadPriorityPolicy is 1, switch tables
3153 if (ThreadPriorityPolicy == 1) {
3154 for (i = 0; i < CriticalPriority+1; i++)
3155 os::java_to_os_priority[i] = prio_policy1[i];
3156 }
3157 if (UseCriticalJavaThreadPriority) {
3158 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3159 // See set_native_priority() and set_lwp_class_and_priority().
3160 // Save original MaxPriority mapping in case attempt to
3161 // use critical priority fails.
3162 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3163 // Set negative to distinguish from other priorities
3164 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3165 }
3166
3167 // Get IDs for a set of well-known scheduling classes.
3168 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3169 // the system. We should have a loop that iterates over the
3170 // classID values, which are known to be "small" integers.
3171
3172 strcpy(ClassInfo.pc_clname, "TS");
3173 ClassInfo.pc_cid = -1;
3174 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3175 if (rslt < 0) return errno;
3176 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3177 tsLimits.schedPolicy = ClassInfo.pc_cid;
3178 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3179 tsLimits.minPrio = -tsLimits.maxPrio;
3180
3181 strcpy(ClassInfo.pc_clname, "IA");
3182 ClassInfo.pc_cid = -1;
3183 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3184 if (rslt < 0) return errno;
3185 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3186 iaLimits.schedPolicy = ClassInfo.pc_cid;
3187 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3188 iaLimits.minPrio = -iaLimits.maxPrio;
3189
3190 strcpy(ClassInfo.pc_clname, "RT");
3191 ClassInfo.pc_cid = -1;
3192 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3193 if (rslt < 0) return errno;
3194 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3195 rtLimits.schedPolicy = ClassInfo.pc_cid;
3196 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3197 rtLimits.minPrio = 0;
3198
3199 strcpy(ClassInfo.pc_clname, "FX");
3200 ClassInfo.pc_cid = -1;
3201 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3202 if (rslt < 0) return errno;
3203 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3204 fxLimits.schedPolicy = ClassInfo.pc_cid;
3205 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3206 fxLimits.minPrio = 0;
3207
3208 // Query our "current" scheduling class.
3209 // This will normally be IA, TS or, rarely, FX or RT.
3210 memset(&ParmInfo, 0, sizeof(ParmInfo));
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 myClass = ParmInfo.pc_cid;
3215
3216 // We now know our scheduling classId, get specific information
3217 // about the class.
3218 ClassInfo.pc_cid = myClass;
3219 ClassInfo.pc_clname[0] = 0;
3220 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3221 if (rslt < 0) return errno;
3222
3223 if (ThreadPriorityVerbose) {
3224 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3225 }
3226
3227 memset(&ParmInfo, 0, sizeof(pcparms_t));
3228 ParmInfo.pc_cid = PC_CLNULL;
3229 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3230 if (rslt < 0) return errno;
3231
3232 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3233 myMin = rtLimits.minPrio;
3234 myMax = rtLimits.maxPrio;
3235 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3236 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3237 myMin = iaLimits.minPrio;
3238 myMax = iaLimits.maxPrio;
3239 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3240 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3241 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3242 myMin = tsLimits.minPrio;
3243 myMax = tsLimits.maxPrio;
3244 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3245 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3246 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3247 myMin = fxLimits.minPrio;
3248 myMax = fxLimits.maxPrio;
3249 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3250 } else {
3251 // No clue - punt
3252 if (ThreadPriorityVerbose) {
3253 tty->print_cr("Unknown scheduling class: %s ... \n",
3254 ClassInfo.pc_clname);
3255 }
3256 return EINVAL; // no clue, punt
3257 }
3258
3259 if (ThreadPriorityVerbose) {
3260 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3261 }
3262
3263 priocntl_enable = true; // Enable changing priorities
3264 return 0;
3265 }
3266
3267 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3268 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3269 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3270 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3271
3272
3273 // scale_to_lwp_priority
3274 //
3275 // Convert from the libthread "thr_setprio" scale to our current
3276 // lwp scheduling class scale.
3277 //
3278 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3279 int v;
3280
3281 if (x == 127) return rMax; // avoid round-down
3282 v = (((x*(rMax-rMin)))/128)+rMin;
3283 return v;
3284 }
3285
3286
3287 // set_lwp_class_and_priority
3288 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3289 int newPrio, int new_class, bool scale) {
3290 int rslt;
3291 int Actual, Expected, prv;
3292 pcparms_t ParmInfo; // for GET-SET
3293 #ifdef ASSERT
3294 pcparms_t ReadBack; // for readback
3295 #endif
3296
3297 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3298 // Query current values.
3299 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3300 // Cache "pcparms_t" in global ParmCache.
3301 // TODO: elide set-to-same-value
3302
3303 // If something went wrong on init, don't change priorities.
3304 if (!priocntl_enable) {
3305 if (ThreadPriorityVerbose) {
3306 tty->print_cr("Trying to set priority but init failed, ignoring");
3307 }
3308 return EINVAL;
3309 }
3310
3311 // If lwp hasn't started yet, just return
3312 // the _start routine will call us again.
3313 if (lwpid <= 0) {
3314 if (ThreadPriorityVerbose) {
3315 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3316 INTPTR_FORMAT " to %d, lwpid not set",
3317 ThreadID, newPrio);
3318 }
3319 return 0;
3320 }
3321
3322 if (ThreadPriorityVerbose) {
3323 tty->print_cr ("set_lwp_class_and_priority("
3324 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3325 ThreadID, lwpid, newPrio);
3326 }
3327
3328 memset(&ParmInfo, 0, sizeof(pcparms_t));
3329 ParmInfo.pc_cid = PC_CLNULL;
3330 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3331 if (rslt < 0) return errno;
3332
3333 int cur_class = ParmInfo.pc_cid;
3334 ParmInfo.pc_cid = (id_t)new_class;
3335
3336 if (new_class == rtLimits.schedPolicy) {
3337 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3338 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3339 rtLimits.maxPrio, newPrio)
3340 : newPrio;
3341 rtInfo->rt_tqsecs = RT_NOCHANGE;
3342 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3343 if (ThreadPriorityVerbose) {
3344 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3345 }
3346 } else if (new_class == iaLimits.schedPolicy) {
3347 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3348 int maxClamped = MIN2(iaLimits.maxPrio,
3349 cur_class == new_class
3350 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3351 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3352 maxClamped, newPrio)
3353 : newPrio;
3354 iaInfo->ia_uprilim = cur_class == new_class
3355 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3356 iaInfo->ia_mode = IA_NOCHANGE;
3357 if (ThreadPriorityVerbose) {
3358 tty->print_cr("IA: [%d...%d] %d->%d\n",
3359 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3360 }
3361 } else if (new_class == tsLimits.schedPolicy) {
3362 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3363 int maxClamped = MIN2(tsLimits.maxPrio,
3364 cur_class == new_class
3365 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3366 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3367 maxClamped, newPrio)
3368 : newPrio;
3369 tsInfo->ts_uprilim = cur_class == new_class
3370 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3371 if (ThreadPriorityVerbose) {
3372 tty->print_cr("TS: [%d...%d] %d->%d\n",
3373 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3374 }
3375 } else if (new_class == fxLimits.schedPolicy) {
3376 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3377 int maxClamped = MIN2(fxLimits.maxPrio,
3378 cur_class == new_class
3379 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3380 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3381 maxClamped, newPrio)
3382 : newPrio;
3383 fxInfo->fx_uprilim = cur_class == new_class
3384 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3385 fxInfo->fx_tqsecs = FX_NOCHANGE;
3386 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3387 if (ThreadPriorityVerbose) {
3388 tty->print_cr("FX: [%d...%d] %d->%d\n",
3389 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3390 }
3391 } else {
3392 if (ThreadPriorityVerbose) {
3393 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3394 }
3395 return EINVAL; // no clue, punt
3396 }
3397
3398 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3399 if (ThreadPriorityVerbose && rslt) {
3400 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3401 }
3402 if (rslt < 0) return errno;
3403
3404 #ifdef ASSERT
3405 // Sanity check: read back what we just attempted to set.
3406 // In theory it could have changed in the interim ...
3407 //
3408 // The priocntl system call is tricky.
3409 // Sometimes it'll validate the priority value argument and
3410 // return EINVAL if unhappy. At other times it fails silently.
3411 // Readbacks are prudent.
3412
3413 if (!ReadBackValidate) return 0;
3414
3415 memset(&ReadBack, 0, sizeof(pcparms_t));
3416 ReadBack.pc_cid = PC_CLNULL;
3417 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3418 assert(rslt >= 0, "priocntl failed");
3419 Actual = Expected = 0xBAD;
3420 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3421 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3422 Actual = RTPRI(ReadBack)->rt_pri;
3423 Expected = RTPRI(ParmInfo)->rt_pri;
3424 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3425 Actual = IAPRI(ReadBack)->ia_upri;
3426 Expected = IAPRI(ParmInfo)->ia_upri;
3427 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3428 Actual = TSPRI(ReadBack)->ts_upri;
3429 Expected = TSPRI(ParmInfo)->ts_upri;
3430 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3431 Actual = FXPRI(ReadBack)->fx_upri;
3432 Expected = FXPRI(ParmInfo)->fx_upri;
3433 } else {
3434 if (ThreadPriorityVerbose) {
3435 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3436 ParmInfo.pc_cid);
3437 }
3438 }
3439
3440 if (Actual != Expected) {
3441 if (ThreadPriorityVerbose) {
3442 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3443 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3444 }
3445 }
3446 #endif
3447
3448 return 0;
3449 }
3450
3451 // Solaris only gives access to 128 real priorities at a time,
3452 // so we expand Java's ten to fill this range. This would be better
3453 // if we dynamically adjusted relative priorities.
3454 //
3455 // The ThreadPriorityPolicy option allows us to select 2 different
3456 // priority scales.
3457 //
3458 // ThreadPriorityPolicy=0
3459 // Since the Solaris' default priority is MaximumPriority, we do not
3460 // set a priority lower than Max unless a priority lower than
3461 // NormPriority is requested.
3462 //
3463 // ThreadPriorityPolicy=1
3464 // This mode causes the priority table to get filled with
3465 // linear values. NormPriority get's mapped to 50% of the
3466 // Maximum priority an so on. This will cause VM threads
3467 // to get unfair treatment against other Solaris processes
3468 // which do not explicitly alter their thread priorities.
3469
3470 int os::java_to_os_priority[CriticalPriority + 1] = {
3471 -99999, // 0 Entry should never be used
3472
3473 0, // 1 MinPriority
3474 32, // 2
3475 64, // 3
3476
3477 96, // 4
3478 127, // 5 NormPriority
3479 127, // 6
3480
3481 127, // 7
3482 127, // 8
3483 127, // 9 NearMaxPriority
3484
3485 127, // 10 MaxPriority
3486
3487 -criticalPrio // 11 CriticalPriority
3488 };
3489
3490 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3491 OSThread* osthread = thread->osthread();
3492
3493 // Save requested priority in case the thread hasn't been started
3494 osthread->set_native_priority(newpri);
3495
3496 // Check for critical priority request
3497 bool fxcritical = false;
3498 if (newpri == -criticalPrio) {
3499 fxcritical = true;
3500 newpri = criticalPrio;
3501 }
3502
3503 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3504 if (!UseThreadPriorities) return OS_OK;
3505
3506 int status = 0;
3507
3508 if (!fxcritical) {
3509 // Use thr_setprio only if we have a priority that thr_setprio understands
3510 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3511 }
3512
3513 int lwp_status =
3514 set_lwp_class_and_priority(osthread->thread_id(),
3515 osthread->lwp_id(),
3516 newpri,
3517 fxcritical ? fxLimits.schedPolicy : myClass,
3518 !fxcritical);
3519 if (lwp_status != 0 && fxcritical) {
3520 // Try again, this time without changing the scheduling class
3521 newpri = java_MaxPriority_to_os_priority;
3522 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3523 osthread->lwp_id(),
3524 newpri, myClass, false);
3525 }
3526 status |= lwp_status;
3527 return (status == 0) ? OS_OK : OS_ERR;
3528 }
3529
3530
3531 OSReturn os::get_native_priority(const Thread* const thread,
3532 int *priority_ptr) {
3533 int p;
3534 if (!UseThreadPriorities) {
3535 *priority_ptr = NormalPriority;
3536 return OS_OK;
3537 }
3538 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3539 if (status != 0) {
3540 return OS_ERR;
3541 }
3542 *priority_ptr = p;
3543 return OS_OK;
3544 }
3545
3546
3547 // Hint to the underlying OS that a task switch would not be good.
3548 // Void return because it's a hint and can fail.
3549 void os::hint_no_preempt() {
3550 schedctl_start(schedctl_init());
3551 }
3552
3553 static void resume_clear_context(OSThread *osthread) {
3554 osthread->set_ucontext(NULL);
3555 }
3556
3557 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3558 osthread->set_ucontext(context);
3559 }
3560
3561 static PosixSemaphore sr_semaphore;
3562
3563 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3564 // Save and restore errno to avoid confusing native code with EINTR
3565 // after sigsuspend.
3566 int old_errno = errno;
3567
3568 OSThread* osthread = thread->osthread();
3569 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3570
3571 os::SuspendResume::State current = osthread->sr.state();
3572 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3573 suspend_save_context(osthread, uc);
3574
3575 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3576 os::SuspendResume::State state = osthread->sr.suspended();
3577 if (state == os::SuspendResume::SR_SUSPENDED) {
3578 sigset_t suspend_set; // signals for sigsuspend()
3579
3580 // get current set of blocked signals and unblock resume signal
3581 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3582 sigdelset(&suspend_set, os::Solaris::SIGasync());
3583
3584 sr_semaphore.signal();
3585 // wait here until we are resumed
3586 while (1) {
3587 sigsuspend(&suspend_set);
3588
3589 os::SuspendResume::State result = osthread->sr.running();
3590 if (result == os::SuspendResume::SR_RUNNING) {
3591 sr_semaphore.signal();
3592 break;
3593 }
3594 }
3595
3596 } else if (state == os::SuspendResume::SR_RUNNING) {
3597 // request was cancelled, continue
3598 } else {
3599 ShouldNotReachHere();
3600 }
3601
3602 resume_clear_context(osthread);
3603 } else if (current == os::SuspendResume::SR_RUNNING) {
3604 // request was cancelled, continue
3605 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3606 // ignore
3607 } else {
3608 // ignore
3609 }
3610
3611 errno = old_errno;
3612 }
3613
3614 void os::print_statistics() {
3615 }
3616
3617 int os::message_box(const char* title, const char* message) {
3618 int i;
3619 fdStream err(defaultStream::error_fd());
3620 for (i = 0; i < 78; i++) err.print_raw("=");
3621 err.cr();
3622 err.print_raw_cr(title);
3623 for (i = 0; i < 78; i++) err.print_raw("-");
3624 err.cr();
3625 err.print_raw_cr(message);
3626 for (i = 0; i < 78; i++) err.print_raw("=");
3627 err.cr();
3628
3629 char buf[16];
3630 // Prevent process from exiting upon "read error" without consuming all CPU
3631 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3632
3633 return buf[0] == 'y' || buf[0] == 'Y';
3634 }
3635
3636 static int sr_notify(OSThread* osthread) {
3637 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3638 assert_status(status == 0, status, "thr_kill");
3639 return status;
3640 }
3641
3642 // "Randomly" selected value for how long we want to spin
3643 // before bailing out on suspending a thread, also how often
3644 // we send a signal to a thread we want to resume
3645 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3646 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3647
3648 static bool do_suspend(OSThread* osthread) {
3649 assert(osthread->sr.is_running(), "thread should be running");
3650 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3651
3652 // mark as suspended and send signal
3653 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3654 // failed to switch, state wasn't running?
3655 ShouldNotReachHere();
3656 return false;
3657 }
3658
3659 if (sr_notify(osthread) != 0) {
3660 ShouldNotReachHere();
3661 }
3662
3663 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3664 while (true) {
3665 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3666 break;
3667 } else {
3668 // timeout
3669 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3670 if (cancelled == os::SuspendResume::SR_RUNNING) {
3671 return false;
3672 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3673 // make sure that we consume the signal on the semaphore as well
3674 sr_semaphore.wait();
3675 break;
3676 } else {
3677 ShouldNotReachHere();
3678 return false;
3679 }
3680 }
3681 }
3682
3683 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3684 return true;
3685 }
3686
3687 static void do_resume(OSThread* osthread) {
3688 assert(osthread->sr.is_suspended(), "thread should be suspended");
3689 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3690
3691 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3692 // failed to switch to WAKEUP_REQUEST
3693 ShouldNotReachHere();
3694 return;
3695 }
3696
3697 while (true) {
3698 if (sr_notify(osthread) == 0) {
3699 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3700 if (osthread->sr.is_running()) {
3701 return;
3702 }
3703 }
3704 } else {
3705 ShouldNotReachHere();
3706 }
3707 }
3708
3709 guarantee(osthread->sr.is_running(), "Must be running!");
3710 }
3711
3712 void os::SuspendedThreadTask::internal_do_task() {
3713 if (do_suspend(_thread->osthread())) {
3714 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3715 do_task(context);
3716 do_resume(_thread->osthread());
3717 }
3718 }
3719
3720 class PcFetcher : public os::SuspendedThreadTask {
3721 public:
3722 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3723 ExtendedPC result();
3724 protected:
3725 void do_task(const os::SuspendedThreadTaskContext& context);
3726 private:
3727 ExtendedPC _epc;
3728 };
3729
3730 ExtendedPC PcFetcher::result() {
3731 guarantee(is_done(), "task is not done yet.");
3732 return _epc;
3733 }
3734
3735 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3736 Thread* thread = context.thread();
3737 OSThread* osthread = thread->osthread();
3738 if (osthread->ucontext() != NULL) {
3739 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
3740 } else {
3741 // NULL context is unexpected, double-check this is the VMThread
3742 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3743 }
3744 }
3745
3746 // A lightweight implementation that does not suspend the target thread and
3747 // thus returns only a hint. Used for profiling only!
3748 ExtendedPC os::get_thread_pc(Thread* thread) {
3749 // Make sure that it is called by the watcher and the Threads lock is owned.
3750 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3751 // For now, is only used to profile the VM Thread
3752 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3753 PcFetcher fetcher(thread);
3754 fetcher.run();
3755 return fetcher.result();
3756 }
3757
3758
3759 // This does not do anything on Solaris. This is basically a hook for being
3760 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3761 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3762 const methodHandle& method, JavaCallArguments* args,
3763 Thread* thread) {
3764 f(value, method, args, thread);
3765 }
3766
3767 // This routine may be used by user applications as a "hook" to catch signals.
3768 // The user-defined signal handler must pass unrecognized signals to this
3769 // routine, and if it returns true (non-zero), then the signal handler must
3770 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3771 // routine will never retun false (zero), but instead will execute a VM panic
3772 // routine kill the process.
3773 //
3774 // If this routine returns false, it is OK to call it again. This allows
3775 // the user-defined signal handler to perform checks either before or after
3776 // the VM performs its own checks. Naturally, the user code would be making
3777 // a serious error if it tried to handle an exception (such as a null check
3778 // or breakpoint) that the VM was generating for its own correct operation.
3779 //
3780 // This routine may recognize any of the following kinds of signals:
3781 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3782 // os::Solaris::SIGasync
3783 // It should be consulted by handlers for any of those signals.
3784 //
3785 // The caller of this routine must pass in the three arguments supplied
3786 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3787 // field of the structure passed to sigaction(). This routine assumes that
3788 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3789 //
3790 // Note that the VM will print warnings if it detects conflicting signal
3791 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3792 //
3793 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3794 siginfo_t* siginfo,
3795 void* ucontext,
3796 int abort_if_unrecognized);
3797
3798
3799 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3800 int orig_errno = errno; // Preserve errno value over signal handler.
3801 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3802 errno = orig_errno;
3803 }
3804
3805 // This boolean allows users to forward their own non-matching signals
3806 // to JVM_handle_solaris_signal, harmlessly.
3807 bool os::Solaris::signal_handlers_are_installed = false;
3808
3809 // For signal-chaining
3810 bool os::Solaris::libjsig_is_loaded = false;
3811 typedef struct sigaction *(*get_signal_t)(int);
3812 get_signal_t os::Solaris::get_signal_action = NULL;
3813
3814 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3815 struct sigaction *actp = NULL;
3816
3817 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3818 // Retrieve the old signal handler from libjsig
3819 actp = (*get_signal_action)(sig);
3820 }
3821 if (actp == NULL) {
3822 // Retrieve the preinstalled signal handler from jvm
3823 actp = get_preinstalled_handler(sig);
3824 }
3825
3826 return actp;
3827 }
3828
3829 static bool call_chained_handler(struct sigaction *actp, int sig,
3830 siginfo_t *siginfo, void *context) {
3831 // Call the old signal handler
3832 if (actp->sa_handler == SIG_DFL) {
3833 // It's more reasonable to let jvm treat it as an unexpected exception
3834 // instead of taking the default action.
3835 return false;
3836 } else if (actp->sa_handler != SIG_IGN) {
3837 if ((actp->sa_flags & SA_NODEFER) == 0) {
3838 // automaticlly block the signal
3839 sigaddset(&(actp->sa_mask), sig);
3840 }
3841
3842 sa_handler_t hand;
3843 sa_sigaction_t sa;
3844 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3845 // retrieve the chained handler
3846 if (siginfo_flag_set) {
3847 sa = actp->sa_sigaction;
3848 } else {
3849 hand = actp->sa_handler;
3850 }
3851
3852 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3853 actp->sa_handler = SIG_DFL;
3854 }
3855
3856 // try to honor the signal mask
3857 sigset_t oset;
3858 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3859
3860 // call into the chained handler
3861 if (siginfo_flag_set) {
3862 (*sa)(sig, siginfo, context);
3863 } else {
3864 (*hand)(sig);
3865 }
3866
3867 // restore the signal mask
3868 thr_sigsetmask(SIG_SETMASK, &oset, 0);
3869 }
3870 // Tell jvm's signal handler the signal is taken care of.
3871 return true;
3872 }
3873
3874 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3875 bool chained = false;
3876 // signal-chaining
3877 if (UseSignalChaining) {
3878 struct sigaction *actp = get_chained_signal_action(sig);
3879 if (actp != NULL) {
3880 chained = call_chained_handler(actp, sig, siginfo, context);
3881 }
3882 }
3883 return chained;
3884 }
3885
3886 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3887 assert((chainedsigactions != (struct sigaction *)NULL) &&
3888 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3889 if (preinstalled_sigs[sig] != 0) {
3890 return &chainedsigactions[sig];
3891 }
3892 return NULL;
3893 }
3894
3895 void os::Solaris::save_preinstalled_handler(int sig,
3896 struct sigaction& oldAct) {
3897 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3898 assert((chainedsigactions != (struct sigaction *)NULL) &&
3899 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3900 chainedsigactions[sig] = oldAct;
3901 preinstalled_sigs[sig] = 1;
3902 }
3903
3904 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3905 bool oktochain) {
3906 // Check for overwrite.
3907 struct sigaction oldAct;
3908 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3909 void* oldhand =
3910 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3911 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3912 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3913 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3914 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3915 if (AllowUserSignalHandlers || !set_installed) {
3916 // Do not overwrite; user takes responsibility to forward to us.
3917 return;
3918 } else if (UseSignalChaining) {
3919 if (oktochain) {
3920 // save the old handler in jvm
3921 save_preinstalled_handler(sig, oldAct);
3922 } else {
3923 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3924 }
3925 // libjsig also interposes the sigaction() call below and saves the
3926 // old sigaction on it own.
3927 } else {
3928 fatal("Encountered unexpected pre-existing sigaction handler "
3929 "%#lx for signal %d.", (long)oldhand, sig);
3930 }
3931 }
3932
3933 struct sigaction sigAct;
3934 sigfillset(&(sigAct.sa_mask));
3935 sigAct.sa_handler = SIG_DFL;
3936
3937 sigAct.sa_sigaction = signalHandler;
3938 // Handle SIGSEGV on alternate signal stack if
3939 // not using stack banging
3940 if (!UseStackBanging && sig == SIGSEGV) {
3941 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3942 } else {
3943 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3944 }
3945 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3946
3947 sigaction(sig, &sigAct, &oldAct);
3948
3949 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3950 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3951 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3952 }
3953
3954
3955 #define DO_SIGNAL_CHECK(sig) \
3956 do { \
3957 if (!sigismember(&check_signal_done, sig)) { \
3958 os::Solaris::check_signal_handler(sig); \
3959 } \
3960 } while (0)
3961
3962 // This method is a periodic task to check for misbehaving JNI applications
3963 // under CheckJNI, we can add any periodic checks here
3964
3965 void os::run_periodic_checks() {
3966 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3967 // thereby preventing a NULL checks.
3968 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3969
3970 if (check_signals == false) return;
3971
3972 // SEGV and BUS if overridden could potentially prevent
3973 // generation of hs*.log in the event of a crash, debugging
3974 // such a case can be very challenging, so we absolutely
3975 // check for the following for a good measure:
3976 DO_SIGNAL_CHECK(SIGSEGV);
3977 DO_SIGNAL_CHECK(SIGILL);
3978 DO_SIGNAL_CHECK(SIGFPE);
3979 DO_SIGNAL_CHECK(SIGBUS);
3980 DO_SIGNAL_CHECK(SIGPIPE);
3981 DO_SIGNAL_CHECK(SIGXFSZ);
3982
3983 // ReduceSignalUsage allows the user to override these handlers
3984 // see comments at the very top and jvm_solaris.h
3985 if (!ReduceSignalUsage) {
3986 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3987 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3988 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3989 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3990 }
3991
3992 // See comments above for using JVM1/JVM2
3993 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
3994
3995 }
3996
3997 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3998
3999 static os_sigaction_t os_sigaction = NULL;
4000
4001 void os::Solaris::check_signal_handler(int sig) {
4002 char buf[O_BUFLEN];
4003 address jvmHandler = NULL;
4004
4005 struct sigaction act;
4006 if (os_sigaction == NULL) {
4007 // only trust the default sigaction, in case it has been interposed
4008 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4009 if (os_sigaction == NULL) return;
4010 }
4011
4012 os_sigaction(sig, (struct sigaction*)NULL, &act);
4013
4014 address thisHandler = (act.sa_flags & SA_SIGINFO)
4015 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4016 : CAST_FROM_FN_PTR(address, act.sa_handler);
4017
4018
4019 switch (sig) {
4020 case SIGSEGV:
4021 case SIGBUS:
4022 case SIGFPE:
4023 case SIGPIPE:
4024 case SIGXFSZ:
4025 case SIGILL:
4026 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4027 break;
4028
4029 case SHUTDOWN1_SIGNAL:
4030 case SHUTDOWN2_SIGNAL:
4031 case SHUTDOWN3_SIGNAL:
4032 case BREAK_SIGNAL:
4033 jvmHandler = (address)user_handler();
4034 break;
4035
4036 default:
4037 int asynsig = os::Solaris::SIGasync();
4038
4039 if (sig == asynsig) {
4040 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4041 } else {
4042 return;
4043 }
4044 break;
4045 }
4046
4047
4048 if (thisHandler != jvmHandler) {
4049 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4050 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4051 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4052 // No need to check this sig any longer
4053 sigaddset(&check_signal_done, sig);
4054 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4055 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4056 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4057 exception_name(sig, buf, O_BUFLEN));
4058 }
4059 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4060 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4061 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4062 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4063 // No need to check this sig any longer
4064 sigaddset(&check_signal_done, sig);
4065 }
4066
4067 // Print all the signal handler state
4068 if (sigismember(&check_signal_done, sig)) {
4069 print_signal_handlers(tty, buf, O_BUFLEN);
4070 }
4071
4072 }
4073
4074 void os::Solaris::install_signal_handlers() {
4075 bool libjsigdone = false;
4076 signal_handlers_are_installed = true;
4077
4078 // signal-chaining
4079 typedef void (*signal_setting_t)();
4080 signal_setting_t begin_signal_setting = NULL;
4081 signal_setting_t end_signal_setting = NULL;
4082 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4083 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4084 if (begin_signal_setting != NULL) {
4085 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4086 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4087 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4088 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4089 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4090 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4091 libjsig_is_loaded = true;
4092 if (os::Solaris::get_libjsig_version != NULL) {
4093 libjsigversion = (*os::Solaris::get_libjsig_version)();
4094 }
4095 assert(UseSignalChaining, "should enable signal-chaining");
4096 }
4097 if (libjsig_is_loaded) {
4098 // Tell libjsig jvm is setting signal handlers
4099 (*begin_signal_setting)();
4100 }
4101
4102 set_signal_handler(SIGSEGV, true, true);
4103 set_signal_handler(SIGPIPE, true, true);
4104 set_signal_handler(SIGXFSZ, true, true);
4105 set_signal_handler(SIGBUS, true, true);
4106 set_signal_handler(SIGILL, true, true);
4107 set_signal_handler(SIGFPE, true, true);
4108
4109
4110 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4111 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4112 // can not register overridable signals which might be > 32
4113 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4114 // Tell libjsig jvm has finished setting signal handlers
4115 (*end_signal_setting)();
4116 libjsigdone = true;
4117 }
4118 }
4119
4120 set_signal_handler(os::Solaris::SIGasync(), true, true);
4121
4122 if (libjsig_is_loaded && !libjsigdone) {
4123 // Tell libjsig jvm finishes setting signal handlers
4124 (*end_signal_setting)();
4125 }
4126
4127 // We don't activate signal checker if libjsig is in place, we trust ourselves
4128 // and if UserSignalHandler is installed all bets are off.
4129 // Log that signal checking is off only if -verbose:jni is specified.
4130 if (CheckJNICalls) {
4131 if (libjsig_is_loaded) {
4132 if (PrintJNIResolving) {
4133 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4134 }
4135 check_signals = false;
4136 }
4137 if (AllowUserSignalHandlers) {
4138 if (PrintJNIResolving) {
4139 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4140 }
4141 check_signals = false;
4142 }
4143 }
4144 }
4145
4146
4147 void report_error(const char* file_name, int line_no, const char* title,
4148 const char* format, ...);
4149
4150 const char * signames[] = {
4151 "SIG0",
4152 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4153 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4154 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4155 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4156 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4157 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4158 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4159 "SIGCANCEL", "SIGLOST"
4160 };
4161
4162 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4163 if (0 < exception_code && exception_code <= SIGRTMAX) {
4164 // signal
4165 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4166 jio_snprintf(buf, size, "%s", signames[exception_code]);
4167 } else {
4168 jio_snprintf(buf, size, "SIG%d", exception_code);
4169 }
4170 return buf;
4171 } else {
4172 return NULL;
4173 }
4174 }
4175
4176 // (Static) wrapper for getisax(2) call.
4177 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4178
4179 // (Static) wrappers for the liblgrp API
4180 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4181 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4182 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4183 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4184 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4185 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4186 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4187 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4188 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4189
4190 // (Static) wrapper for meminfo() call.
4191 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4192
4193 static address resolve_symbol_lazy(const char* name) {
4194 address addr = (address) dlsym(RTLD_DEFAULT, name);
4195 if (addr == NULL) {
4196 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4197 addr = (address) dlsym(RTLD_NEXT, name);
4198 }
4199 return addr;
4200 }
4201
4202 static address resolve_symbol(const char* name) {
4203 address addr = resolve_symbol_lazy(name);
4204 if (addr == NULL) {
4205 fatal(dlerror());
4206 }
4207 return addr;
4208 }
4209
4210 void os::Solaris::libthread_init() {
4211 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4212
4213 lwp_priocntl_init();
4214
4215 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4216 if (func == NULL) {
4217 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4218 // Guarantee that this VM is running on an new enough OS (5.6 or
4219 // later) that it will have a new enough libthread.so.
4220 guarantee(func != NULL, "libthread.so is too old.");
4221 }
4222
4223 int size;
4224 void (*handler_info_func)(address *, int *);
4225 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4226 handler_info_func(&handler_start, &size);
4227 handler_end = handler_start + size;
4228 }
4229
4230
4231 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4232 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4233 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4234 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4235 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4236 int os::Solaris::_mutex_scope = USYNC_THREAD;
4237
4238 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4239 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4240 int_fnP_cond_tP os::Solaris::_cond_signal;
4241 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4242 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4243 int_fnP_cond_tP os::Solaris::_cond_destroy;
4244 int os::Solaris::_cond_scope = USYNC_THREAD;
4245
4246 void os::Solaris::synchronization_init() {
4247 if (UseLWPSynchronization) {
4248 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4249 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4250 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4251 os::Solaris::set_mutex_init(lwp_mutex_init);
4252 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4253 os::Solaris::set_mutex_scope(USYNC_THREAD);
4254
4255 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4256 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4257 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4258 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4259 os::Solaris::set_cond_init(lwp_cond_init);
4260 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4261 os::Solaris::set_cond_scope(USYNC_THREAD);
4262 } else {
4263 os::Solaris::set_mutex_scope(USYNC_THREAD);
4264 os::Solaris::set_cond_scope(USYNC_THREAD);
4265
4266 if (UsePthreads) {
4267 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4268 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4269 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4270 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4271 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4272
4273 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4274 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4275 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4276 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4277 os::Solaris::set_cond_init(pthread_cond_default_init);
4278 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4279 } else {
4280 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4281 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4282 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4283 os::Solaris::set_mutex_init(::mutex_init);
4284 os::Solaris::set_mutex_destroy(::mutex_destroy);
4285
4286 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4287 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4288 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4289 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4290 os::Solaris::set_cond_init(::cond_init);
4291 os::Solaris::set_cond_destroy(::cond_destroy);
4292 }
4293 }
4294 }
4295
4296 bool os::Solaris::liblgrp_init() {
4297 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4298 if (handle != NULL) {
4299 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4300 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4301 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4302 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4303 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4304 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4305 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4306 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4307 dlsym(handle, "lgrp_cookie_stale")));
4308
4309 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4310 set_lgrp_cookie(c);
4311 return true;
4312 }
4313 return false;
4314 }
4315
4316 void os::Solaris::misc_sym_init() {
4317 address func;
4318
4319 // getisax
4320 func = resolve_symbol_lazy("getisax");
4321 if (func != NULL) {
4322 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4323 }
4324
4325 // meminfo
4326 func = resolve_symbol_lazy("meminfo");
4327 if (func != NULL) {
4328 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4329 }
4330 }
4331
4332 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4333 assert(_getisax != NULL, "_getisax not set");
4334 return _getisax(array, n);
4335 }
4336
4337 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4338 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4339 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4340
4341 void init_pset_getloadavg_ptr(void) {
4342 pset_getloadavg_ptr =
4343 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4344 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4345 warning("pset_getloadavg function not found");
4346 }
4347 }
4348
4349 int os::Solaris::_dev_zero_fd = -1;
4350
4351 // this is called _before_ the global arguments have been parsed
4352 void os::init(void) {
4353 _initial_pid = getpid();
4354
4355 max_hrtime = first_hrtime = gethrtime();
4356
4357 init_random(1234567);
4358
4359 page_size = sysconf(_SC_PAGESIZE);
4360 if (page_size == -1) {
4361 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno));
4362 }
4363 init_page_sizes((size_t) page_size);
4364
4365 Solaris::initialize_system_info();
4366
4367 // Initialize misc. symbols as soon as possible, so we can use them
4368 // if we need them.
4369 Solaris::misc_sym_init();
4370
4371 int fd = ::open("/dev/zero", O_RDWR);
4372 if (fd < 0) {
4373 fatal("os::init: cannot open /dev/zero (%s)", strerror(errno));
4374 } else {
4375 Solaris::set_dev_zero_fd(fd);
4376
4377 // Close on exec, child won't inherit.
4378 fcntl(fd, F_SETFD, FD_CLOEXEC);
4379 }
4380
4381 clock_tics_per_sec = CLK_TCK;
4382
4383 // check if dladdr1() exists; dladdr1 can provide more information than
4384 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4385 // and is available on linker patches for 5.7 and 5.8.
4386 // libdl.so must have been loaded, this call is just an entry lookup
4387 void * hdl = dlopen("libdl.so", RTLD_NOW);
4388 if (hdl) {
4389 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4390 }
4391
4392 // (Solaris only) this switches to calls that actually do locking.
4393 ThreadCritical::initialize();
4394
4395 main_thread = thr_self();
4396
4397 // Constant minimum stack size allowed. It must be at least
4398 // the minimum of what the OS supports (thr_min_stack()), and
4399 // enough to allow the thread to get to user bytecode execution.
4400 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4401 // If the pagesize of the VM is greater than 8K determine the appropriate
4402 // number of initial guard pages. The user can change this with the
4403 // command line arguments, if needed.
4404 if (vm_page_size() > 8*K) {
4405 StackYellowPages = 1;
4406 StackRedPages = 1;
4407 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4408 }
4409 }
4410
4411 // To install functions for atexit system call
4412 extern "C" {
4413 static void perfMemory_exit_helper() {
4414 perfMemory_exit();
4415 }
4416 }
4417
4418 // this is called _after_ the global arguments have been parsed
4419 jint os::init_2(void) {
4420 // try to enable extended file IO ASAP, see 6431278
4421 os::Solaris::try_enable_extended_io();
4422
4423 // Allocate a single page and mark it as readable for safepoint polling. Also
4424 // use this first mmap call to check support for MAP_ALIGN.
4425 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4426 page_size,
4427 MAP_PRIVATE | MAP_ALIGN,
4428 PROT_READ);
4429 if (polling_page == NULL) {
4430 has_map_align = false;
4431 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4432 PROT_READ);
4433 }
4434
4435 os::set_polling_page(polling_page);
4436
4437 #ifndef PRODUCT
4438 if (Verbose && PrintMiscellaneous) {
4439 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4440 (intptr_t)polling_page);
4441 }
4442 #endif
4443
4444 if (!UseMembar) {
4445 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4446 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4447 os::set_memory_serialize_page(mem_serialize_page);
4448
4449 #ifndef PRODUCT
4450 if (Verbose && PrintMiscellaneous) {
4451 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4452 (intptr_t)mem_serialize_page);
4453 }
4454 #endif
4455 }
4456
4457 // Check minimum allowable stack size for thread creation and to initialize
4458 // the java system classes, including StackOverflowError - depends on page
4459 // size. Add a page for compiler2 recursion in main thread.
4460 // Add in 2*BytesPerWord times page size to account for VM stack during
4461 // class initialization depending on 32 or 64 bit VM.
4462 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4463 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4464 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4465
4466 size_t threadStackSizeInBytes = ThreadStackSize * K;
4467 if (threadStackSizeInBytes != 0 &&
4468 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4469 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4470 os::Solaris::min_stack_allowed/K);
4471 return JNI_ERR;
4472 }
4473
4474 // For 64kbps there will be a 64kb page size, which makes
4475 // the usable default stack size quite a bit less. Increase the
4476 // stack for 64kb (or any > than 8kb) pages, this increases
4477 // virtual memory fragmentation (since we're not creating the
4478 // stack on a power of 2 boundary. The real fix for this
4479 // should be to fix the guard page mechanism.
4480
4481 if (vm_page_size() > 8*K) {
4482 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4483 ? threadStackSizeInBytes +
4484 ((StackYellowPages + StackRedPages) * vm_page_size())
4485 : 0;
4486 ThreadStackSize = threadStackSizeInBytes/K;
4487 }
4488
4489 // Make the stack size a multiple of the page size so that
4490 // the yellow/red zones can be guarded.
4491 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4492 vm_page_size()));
4493
4494 Solaris::libthread_init();
4495
4496 if (UseNUMA) {
4497 if (!Solaris::liblgrp_init()) {
4498 UseNUMA = false;
4499 } else {
4500 size_t lgrp_limit = os::numa_get_groups_num();
4501 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4502 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4503 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4504 if (lgrp_num < 2) {
4505 // There's only one locality group, disable NUMA.
4506 UseNUMA = false;
4507 }
4508 }
4509 if (!UseNUMA && ForceNUMA) {
4510 UseNUMA = true;
4511 }
4512 }
4513
4514 Solaris::signal_sets_init();
4515 Solaris::init_signal_mem();
4516 Solaris::install_signal_handlers();
4517
4518 if (libjsigversion < JSIG_VERSION_1_4_1) {
4519 Maxlibjsigsigs = OLDMAXSIGNUM;
4520 }
4521
4522 // initialize synchronization primitives to use either thread or
4523 // lwp synchronization (controlled by UseLWPSynchronization)
4524 Solaris::synchronization_init();
4525
4526 if (MaxFDLimit) {
4527 // set the number of file descriptors to max. print out error
4528 // if getrlimit/setrlimit fails but continue regardless.
4529 struct rlimit nbr_files;
4530 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4531 if (status != 0) {
4532 if (PrintMiscellaneous && (Verbose || WizardMode)) {
4533 perror("os::init_2 getrlimit failed");
4534 }
4535 } else {
4536 nbr_files.rlim_cur = nbr_files.rlim_max;
4537 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4538 if (status != 0) {
4539 if (PrintMiscellaneous && (Verbose || WizardMode)) {
4540 perror("os::init_2 setrlimit failed");
4541 }
4542 }
4543 }
4544 }
4545
4546 // Calculate theoretical max. size of Threads to guard gainst
4547 // artifical out-of-memory situations, where all available address-
4548 // space has been reserved by thread stacks. Default stack size is 1Mb.
4549 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4550 JavaThread::stack_size_at_create() : (1*K*K);
4551 assert(pre_thread_stack_size != 0, "Must have a stack");
4552 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4553 // we should start doing Virtual Memory banging. Currently when the threads will
4554 // have used all but 200Mb of space.
4555 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4556 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4557
4558 // at-exit methods are called in the reverse order of their registration.
4559 // In Solaris 7 and earlier, atexit functions are called on return from
4560 // main or as a result of a call to exit(3C). There can be only 32 of
4561 // these functions registered and atexit() does not set errno. In Solaris
4562 // 8 and later, there is no limit to the number of functions registered
4563 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4564 // functions are called upon dlclose(3DL) in addition to return from main
4565 // and exit(3C).
4566
4567 if (PerfAllowAtExitRegistration) {
4568 // only register atexit functions if PerfAllowAtExitRegistration is set.
4569 // atexit functions can be delayed until process exit time, which
4570 // can be problematic for embedded VM situations. Embedded VMs should
4571 // call DestroyJavaVM() to assure that VM resources are released.
4572
4573 // note: perfMemory_exit_helper atexit function may be removed in
4574 // the future if the appropriate cleanup code can be added to the
4575 // VM_Exit VMOperation's doit method.
4576 if (atexit(perfMemory_exit_helper) != 0) {
4577 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4578 }
4579 }
4580
4581 // Init pset_loadavg function pointer
4582 init_pset_getloadavg_ptr();
4583
4584 return JNI_OK;
4585 }
4586
4587 // Mark the polling page as unreadable
4588 void os::make_polling_page_unreadable(void) {
4589 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4590 fatal("Could not disable polling page");
4591 }
4592 }
4593
4594 // Mark the polling page as readable
4595 void os::make_polling_page_readable(void) {
4596 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4597 fatal("Could not enable polling page");
4598 }
4599 }
4600
4601 // OS interface.
4602
4603 bool os::check_heap(bool force) { return true; }
4604
4605 // Is a (classpath) directory empty?
4606 bool os::dir_is_empty(const char* path) {
4607 DIR *dir = NULL;
4608 struct dirent *ptr;
4609
4610 dir = opendir(path);
4611 if (dir == NULL) return true;
4612
4613 // Scan the directory
4614 bool result = true;
4615 char buf[sizeof(struct dirent) + MAX_PATH];
4616 struct dirent *dbuf = (struct dirent *) buf;
4617 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4618 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4619 result = false;
4620 }
4621 }
4622 closedir(dir);
4623 return result;
4624 }
4625
4626 // This code originates from JDK's sysOpen and open64_w
4627 // from src/solaris/hpi/src/system_md.c
4628
4629 int os::open(const char *path, int oflag, int mode) {
4630 if (strlen(path) > MAX_PATH - 1) {
4631 errno = ENAMETOOLONG;
4632 return -1;
4633 }
4634 int fd;
4635
4636 fd = ::open64(path, oflag, mode);
4637 if (fd == -1) return -1;
4638
4639 // If the open succeeded, the file might still be a directory
4640 {
4641 struct stat64 buf64;
4642 int ret = ::fstat64(fd, &buf64);
4643 int st_mode = buf64.st_mode;
4644
4645 if (ret != -1) {
4646 if ((st_mode & S_IFMT) == S_IFDIR) {
4647 errno = EISDIR;
4648 ::close(fd);
4649 return -1;
4650 }
4651 } else {
4652 ::close(fd);
4653 return -1;
4654 }
4655 }
4656
4657 // 32-bit Solaris systems suffer from:
4658 //
4659 // - an historical default soft limit of 256 per-process file
4660 // descriptors that is too low for many Java programs.
4661 //
4662 // - a design flaw where file descriptors created using stdio
4663 // fopen must be less than 256, _even_ when the first limit above
4664 // has been raised. This can cause calls to fopen (but not calls to
4665 // open, for example) to fail mysteriously, perhaps in 3rd party
4666 // native code (although the JDK itself uses fopen). One can hardly
4667 // criticize them for using this most standard of all functions.
4668 //
4669 // We attempt to make everything work anyways by:
4670 //
4671 // - raising the soft limit on per-process file descriptors beyond
4672 // 256
4673 //
4674 // - As of Solaris 10u4, we can request that Solaris raise the 256
4675 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4676 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4677 //
4678 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4679 // workaround the bug by remapping non-stdio file descriptors below
4680 // 256 to ones beyond 256, which is done below.
4681 //
4682 // See:
4683 // 1085341: 32-bit stdio routines should support file descriptors >255
4684 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4685 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4686 // enable_extended_FILE_stdio() in VM initialisation
4687 // Giri Mandalika's blog
4688 // http://technopark02.blogspot.com/2005_05_01_archive.html
4689 //
4690 #ifndef _LP64
4691 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4692 int newfd = ::fcntl(fd, F_DUPFD, 256);
4693 if (newfd != -1) {
4694 ::close(fd);
4695 fd = newfd;
4696 }
4697 }
4698 #endif // 32-bit Solaris
4699
4700 // All file descriptors that are opened in the JVM and not
4701 // specifically destined for a subprocess should have the
4702 // close-on-exec flag set. If we don't set it, then careless 3rd
4703 // party native code might fork and exec without closing all
4704 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4705 // UNIXProcess.c), and this in turn might:
4706 //
4707 // - cause end-of-file to fail to be detected on some file
4708 // descriptors, resulting in mysterious hangs, or
4709 //
4710 // - might cause an fopen in the subprocess to fail on a system
4711 // suffering from bug 1085341.
4712 //
4713 // (Yes, the default setting of the close-on-exec flag is a Unix
4714 // design flaw)
4715 //
4716 // See:
4717 // 1085341: 32-bit stdio routines should support file descriptors >255
4718 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4719 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4720 //
4721 #ifdef FD_CLOEXEC
4722 {
4723 int flags = ::fcntl(fd, F_GETFD);
4724 if (flags != -1) {
4725 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4726 }
4727 }
4728 #endif
4729
4730 return fd;
4731 }
4732
4733 // create binary file, rewriting existing file if required
4734 int os::create_binary_file(const char* path, bool rewrite_existing) {
4735 int oflags = O_WRONLY | O_CREAT;
4736 if (!rewrite_existing) {
4737 oflags |= O_EXCL;
4738 }
4739 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4740 }
4741
4742 // return current position of file pointer
4743 jlong os::current_file_offset(int fd) {
4744 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4745 }
4746
4747 // move file pointer to the specified offset
4748 jlong os::seek_to_file_offset(int fd, jlong offset) {
4749 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4750 }
4751
4752 jlong os::lseek(int fd, jlong offset, int whence) {
4753 return (jlong) ::lseek64(fd, offset, whence);
4754 }
4755
4756 char * os::native_path(char *path) {
4757 return path;
4758 }
4759
4760 int os::ftruncate(int fd, jlong length) {
4761 return ::ftruncate64(fd, length);
4762 }
4763
4764 int os::fsync(int fd) {
4765 RESTARTABLE_RETURN_INT(::fsync(fd));
4766 }
4767
4768 int os::available(int fd, jlong *bytes) {
4769 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4770 "Assumed _thread_in_native");
4771 jlong cur, end;
4772 int mode;
4773 struct stat64 buf64;
4774
4775 if (::fstat64(fd, &buf64) >= 0) {
4776 mode = buf64.st_mode;
4777 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4778 int n,ioctl_return;
4779
4780 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4781 if (ioctl_return>= 0) {
4782 *bytes = n;
4783 return 1;
4784 }
4785 }
4786 }
4787 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4788 return 0;
4789 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4790 return 0;
4791 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4792 return 0;
4793 }
4794 *bytes = end - cur;
4795 return 1;
4796 }
4797
4798 // Map a block of memory.
4799 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4800 char *addr, size_t bytes, bool read_only,
4801 bool allow_exec) {
4802 int prot;
4803 int flags;
4804
4805 if (read_only) {
4806 prot = PROT_READ;
4807 flags = MAP_SHARED;
4808 } else {
4809 prot = PROT_READ | PROT_WRITE;
4810 flags = MAP_PRIVATE;
4811 }
4812
4813 if (allow_exec) {
4814 prot |= PROT_EXEC;
4815 }
4816
4817 if (addr != NULL) {
4818 flags |= MAP_FIXED;
4819 }
4820
4821 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4822 fd, file_offset);
4823 if (mapped_address == MAP_FAILED) {
4824 return NULL;
4825 }
4826 return mapped_address;
4827 }
4828
4829
4830 // Remap a block of memory.
4831 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4832 char *addr, size_t bytes, bool read_only,
4833 bool allow_exec) {
4834 // same as map_memory() on this OS
4835 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4836 allow_exec);
4837 }
4838
4839
4840 // Unmap a block of memory.
4841 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4842 return munmap(addr, bytes) == 0;
4843 }
4844
4845 void os::pause() {
4846 char filename[MAX_PATH];
4847 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4848 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4849 } else {
4850 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4851 }
4852
4853 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4854 if (fd != -1) {
4855 struct stat buf;
4856 ::close(fd);
4857 while (::stat(filename, &buf) == 0) {
4858 (void)::poll(NULL, 0, 100);
4859 }
4860 } else {
4861 jio_fprintf(stderr,
4862 "Could not open pause file '%s', continuing immediately.\n", filename);
4863 }
4864 }
4865
4866 #ifndef PRODUCT
4867 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4868 // Turn this on if you need to trace synch operations.
4869 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4870 // and call record_synch_enable and record_synch_disable
4871 // around the computation of interest.
4872
4873 void record_synch(char* name, bool returning); // defined below
4874
4875 class RecordSynch {
4876 char* _name;
4877 public:
4878 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4879 ~RecordSynch() { record_synch(_name, true); }
4880 };
4881
4882 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4883 extern "C" ret name params { \
4884 typedef ret name##_t params; \
4885 static name##_t* implem = NULL; \
4886 static int callcount = 0; \
4887 if (implem == NULL) { \
4888 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4889 if (implem == NULL) fatal(dlerror()); \
4890 } \
4891 ++callcount; \
4892 RecordSynch _rs(#name); \
4893 inner; \
4894 return implem args; \
4895 }
4896 // in dbx, examine callcounts this way:
4897 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4898
4899 #define CHECK_POINTER_OK(p) \
4900 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4901 #define CHECK_MU \
4902 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4903 #define CHECK_CV \
4904 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4905 #define CHECK_P(p) \
4906 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4907
4908 #define CHECK_MUTEX(mutex_op) \
4909 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4910
4911 CHECK_MUTEX( mutex_lock)
4912 CHECK_MUTEX( _mutex_lock)
4913 CHECK_MUTEX( mutex_unlock)
4914 CHECK_MUTEX(_mutex_unlock)
4915 CHECK_MUTEX( mutex_trylock)
4916 CHECK_MUTEX(_mutex_trylock)
4917
4918 #define CHECK_COND(cond_op) \
4919 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4920
4921 CHECK_COND( cond_wait);
4922 CHECK_COND(_cond_wait);
4923 CHECK_COND(_cond_wait_cancel);
4924
4925 #define CHECK_COND2(cond_op) \
4926 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4927
4928 CHECK_COND2( cond_timedwait);
4929 CHECK_COND2(_cond_timedwait);
4930 CHECK_COND2(_cond_timedwait_cancel);
4931
4932 // do the _lwp_* versions too
4933 #define mutex_t lwp_mutex_t
4934 #define cond_t lwp_cond_t
4935 CHECK_MUTEX( _lwp_mutex_lock)
4936 CHECK_MUTEX( _lwp_mutex_unlock)
4937 CHECK_MUTEX( _lwp_mutex_trylock)
4938 CHECK_MUTEX( __lwp_mutex_lock)
4939 CHECK_MUTEX( __lwp_mutex_unlock)
4940 CHECK_MUTEX( __lwp_mutex_trylock)
4941 CHECK_MUTEX(___lwp_mutex_lock)
4942 CHECK_MUTEX(___lwp_mutex_unlock)
4943
4944 CHECK_COND( _lwp_cond_wait);
4945 CHECK_COND( __lwp_cond_wait);
4946 CHECK_COND(___lwp_cond_wait);
4947
4948 CHECK_COND2( _lwp_cond_timedwait);
4949 CHECK_COND2( __lwp_cond_timedwait);
4950 #undef mutex_t
4951 #undef cond_t
4952
4953 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4954 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4955 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4956 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4957 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4958 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4959 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4960 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4961
4962
4963 // recording machinery:
4964
4965 enum { RECORD_SYNCH_LIMIT = 200 };
4966 char* record_synch_name[RECORD_SYNCH_LIMIT];
4967 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4968 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4969 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4970 int record_synch_count = 0;
4971 bool record_synch_enabled = false;
4972
4973 // in dbx, examine recorded data this way:
4974 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4975
4976 void record_synch(char* name, bool returning) {
4977 if (record_synch_enabled) {
4978 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4979 record_synch_name[record_synch_count] = name;
4980 record_synch_returning[record_synch_count] = returning;
4981 record_synch_thread[record_synch_count] = thr_self();
4982 record_synch_arg0ptr[record_synch_count] = &name;
4983 record_synch_count++;
4984 }
4985 // put more checking code here:
4986 // ...
4987 }
4988 }
4989
4990 void record_synch_enable() {
4991 // start collecting trace data, if not already doing so
4992 if (!record_synch_enabled) record_synch_count = 0;
4993 record_synch_enabled = true;
4994 }
4995
4996 void record_synch_disable() {
4997 // stop collecting trace data
4998 record_synch_enabled = false;
4999 }
5000
5001 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5002 #endif // PRODUCT
5003
5004 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5005 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5006 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5007
5008
5009 // JVMTI & JVM monitoring and management support
5010 // The thread_cpu_time() and current_thread_cpu_time() are only
5011 // supported if is_thread_cpu_time_supported() returns true.
5012 // They are not supported on Solaris T1.
5013
5014 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5015 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5016 // of a thread.
5017 //
5018 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5019 // returns the fast estimate available on the platform.
5020
5021 // hrtime_t gethrvtime() return value includes
5022 // user time but does not include system time
5023 jlong os::current_thread_cpu_time() {
5024 return (jlong) gethrvtime();
5025 }
5026
5027 jlong os::thread_cpu_time(Thread *thread) {
5028 // return user level CPU time only to be consistent with
5029 // what current_thread_cpu_time returns.
5030 // thread_cpu_time_info() must be changed if this changes
5031 return os::thread_cpu_time(thread, false /* user time only */);
5032 }
5033
5034 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5035 if (user_sys_cpu_time) {
5036 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5037 } else {
5038 return os::current_thread_cpu_time();
5039 }
5040 }
5041
5042 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5043 char proc_name[64];
5044 int count;
5045 prusage_t prusage;
5046 jlong lwp_time;
5047 int fd;
5048
5049 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5050 getpid(),
5051 thread->osthread()->lwp_id());
5052 fd = ::open(proc_name, O_RDONLY);
5053 if (fd == -1) return -1;
5054
5055 do {
5056 count = ::pread(fd,
5057 (void *)&prusage.pr_utime,
5058 thr_time_size,
5059 thr_time_off);
5060 } while (count < 0 && errno == EINTR);
5061 ::close(fd);
5062 if (count < 0) return -1;
5063
5064 if (user_sys_cpu_time) {
5065 // user + system CPU time
5066 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5067 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5068 (jlong)prusage.pr_stime.tv_nsec +
5069 (jlong)prusage.pr_utime.tv_nsec;
5070 } else {
5071 // user level CPU time only
5072 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5073 (jlong)prusage.pr_utime.tv_nsec;
5074 }
5075
5076 return (lwp_time);
5077 }
5078
5079 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5080 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5081 info_ptr->may_skip_backward = false; // elapsed time not wall time
5082 info_ptr->may_skip_forward = false; // elapsed time not wall time
5083 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5084 }
5085
5086 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5087 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5088 info_ptr->may_skip_backward = false; // elapsed time not wall time
5089 info_ptr->may_skip_forward = false; // elapsed time not wall time
5090 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5091 }
5092
5093 bool os::is_thread_cpu_time_supported() {
5094 return true;
5095 }
5096
5097 // System loadavg support. Returns -1 if load average cannot be obtained.
5098 // Return the load average for our processor set if the primitive exists
5099 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5100 int os::loadavg(double loadavg[], int nelem) {
5101 if (pset_getloadavg_ptr != NULL) {
5102 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5103 } else {
5104 return ::getloadavg(loadavg, nelem);
5105 }
5106 }
5107
5108 //---------------------------------------------------------------------------------
5109
5110 bool os::find(address addr, outputStream* st) {
5111 Dl_info dlinfo;
5112 memset(&dlinfo, 0, sizeof(dlinfo));
5113 if (dladdr(addr, &dlinfo) != 0) {
5114 st->print(PTR_FORMAT ": ", addr);
5115 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5116 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5117 } else if (dlinfo.dli_fbase != NULL) {
5118 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5119 } else {
5120 st->print("<absolute address>");
5121 }
5122 if (dlinfo.dli_fname != NULL) {
5123 st->print(" in %s", dlinfo.dli_fname);
5124 }
5125 if (dlinfo.dli_fbase != NULL) {
5126 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5127 }
5128 st->cr();
5129
5130 if (Verbose) {
5131 // decode some bytes around the PC
5132 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5133 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5134 address lowest = (address) dlinfo.dli_sname;
5135 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5136 if (begin < lowest) begin = lowest;
5137 Dl_info dlinfo2;
5138 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5139 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
5140 end = (address) dlinfo2.dli_saddr;
5141 }
5142 Disassembler::decode(begin, end, st);
5143 }
5144 return true;
5145 }
5146 return false;
5147 }
5148
5149 // Following function has been added to support HotSparc's libjvm.so running
5150 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5151 // src/solaris/hpi/native_threads in the EVM codebase.
5152 //
5153 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5154 // libraries and should thus be removed. We will leave it behind for a while
5155 // until we no longer want to able to run on top of 1.3.0 Solaris production
5156 // JDK. See 4341971.
5157
5158 #define STACK_SLACK 0x800
5159
5160 extern "C" {
5161 intptr_t sysThreadAvailableStackWithSlack() {
5162 stack_t st;
5163 intptr_t retval, stack_top;
5164 retval = thr_stksegment(&st);
5165 assert(retval == 0, "incorrect return value from thr_stksegment");
5166 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5167 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5168 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5169 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5170 }
5171 }
5172
5173 // ObjectMonitor park-unpark infrastructure ...
5174 //
5175 // We implement Solaris and Linux PlatformEvents with the
5176 // obvious condvar-mutex-flag triple.
5177 // Another alternative that works quite well is pipes:
5178 // Each PlatformEvent consists of a pipe-pair.
5179 // The thread associated with the PlatformEvent
5180 // calls park(), which reads from the input end of the pipe.
5181 // Unpark() writes into the other end of the pipe.
5182 // The write-side of the pipe must be set NDELAY.
5183 // Unfortunately pipes consume a large # of handles.
5184 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5185 // Using pipes for the 1st few threads might be workable, however.
5186 //
5187 // park() is permitted to return spuriously.
5188 // Callers of park() should wrap the call to park() in
5189 // an appropriate loop. A litmus test for the correct
5190 // usage of park is the following: if park() were modified
5191 // to immediately return 0 your code should still work,
5192 // albeit degenerating to a spin loop.
5193 //
5194 // In a sense, park()-unpark() just provides more polite spinning
5195 // and polling with the key difference over naive spinning being
5196 // that a parked thread needs to be explicitly unparked() in order
5197 // to wake up and to poll the underlying condition.
5198 //
5199 // Assumption:
5200 // Only one parker can exist on an event, which is why we allocate
5201 // them per-thread. Multiple unparkers can coexist.
5202 //
5203 // _Event transitions in park()
5204 // -1 => -1 : illegal
5205 // 1 => 0 : pass - return immediately
5206 // 0 => -1 : block; then set _Event to 0 before returning
5207 //
5208 // _Event transitions in unpark()
5209 // 0 => 1 : just return
5210 // 1 => 1 : just return
5211 // -1 => either 0 or 1; must signal target thread
5212 // That is, we can safely transition _Event from -1 to either
5213 // 0 or 1.
5214 //
5215 // _Event serves as a restricted-range semaphore.
5216 // -1 : thread is blocked, i.e. there is a waiter
5217 // 0 : neutral: thread is running or ready,
5218 // could have been signaled after a wait started
5219 // 1 : signaled - thread is running or ready
5220 //
5221 // Another possible encoding of _Event would be with
5222 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5223 //
5224 // TODO-FIXME: add DTRACE probes for:
5225 // 1. Tx parks
5226 // 2. Ty unparks Tx
5227 // 3. Tx resumes from park
5228
5229
5230 // value determined through experimentation
5231 #define ROUNDINGFIX 11
5232
5233 // utility to compute the abstime argument to timedwait.
5234 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5235
5236 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5237 // millis is the relative timeout time
5238 // abstime will be the absolute timeout time
5239 if (millis < 0) millis = 0;
5240 struct timeval now;
5241 int status = gettimeofday(&now, NULL);
5242 assert(status == 0, "gettimeofday");
5243 jlong seconds = millis / 1000;
5244 jlong max_wait_period;
5245
5246 if (UseLWPSynchronization) {
5247 // forward port of fix for 4275818 (not sleeping long enough)
5248 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5249 // _lwp_cond_timedwait() used a round_down algorithm rather
5250 // than a round_up. For millis less than our roundfactor
5251 // it rounded down to 0 which doesn't meet the spec.
5252 // For millis > roundfactor we may return a bit sooner, but
5253 // since we can not accurately identify the patch level and
5254 // this has already been fixed in Solaris 9 and 8 we will
5255 // leave it alone rather than always rounding down.
5256
5257 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5258 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5259 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5260 max_wait_period = 21000000;
5261 } else {
5262 max_wait_period = 50000000;
5263 }
5264 millis %= 1000;
5265 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5266 seconds = max_wait_period;
5267 }
5268 abstime->tv_sec = now.tv_sec + seconds;
5269 long usec = now.tv_usec + millis * 1000;
5270 if (usec >= 1000000) {
5271 abstime->tv_sec += 1;
5272 usec -= 1000000;
5273 }
5274 abstime->tv_nsec = usec * 1000;
5275 return abstime;
5276 }
5277
5278 void os::PlatformEvent::park() { // AKA: down()
5279 // Transitions for _Event:
5280 // -1 => -1 : illegal
5281 // 1 => 0 : pass - return immediately
5282 // 0 => -1 : block; then set _Event to 0 before returning
5283
5284 // Invariant: Only the thread associated with the Event/PlatformEvent
5285 // may call park().
5286 assert(_nParked == 0, "invariant");
5287
5288 int v;
5289 for (;;) {
5290 v = _Event;
5291 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5292 }
5293 guarantee(v >= 0, "invariant");
5294 if (v == 0) {
5295 // Do this the hard way by blocking ...
5296 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5297 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5298 // Only for SPARC >= V8PlusA
5299 #if defined(__sparc) && defined(COMPILER2)
5300 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5301 #endif
5302 int status = os::Solaris::mutex_lock(_mutex);
5303 assert_status(status == 0, status, "mutex_lock");
5304 guarantee(_nParked == 0, "invariant");
5305 ++_nParked;
5306 while (_Event < 0) {
5307 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5308 // Treat this the same as if the wait was interrupted
5309 // With usr/lib/lwp going to kernel, always handle ETIME
5310 status = os::Solaris::cond_wait(_cond, _mutex);
5311 if (status == ETIME) status = EINTR;
5312 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5313 }
5314 --_nParked;
5315 _Event = 0;
5316 status = os::Solaris::mutex_unlock(_mutex);
5317 assert_status(status == 0, status, "mutex_unlock");
5318 // Paranoia to ensure our locked and lock-free paths interact
5319 // correctly with each other.
5320 OrderAccess::fence();
5321 }
5322 }
5323
5324 int os::PlatformEvent::park(jlong millis) {
5325 // Transitions for _Event:
5326 // -1 => -1 : illegal
5327 // 1 => 0 : pass - return immediately
5328 // 0 => -1 : block; then set _Event to 0 before returning
5329
5330 guarantee(_nParked == 0, "invariant");
5331 int v;
5332 for (;;) {
5333 v = _Event;
5334 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5335 }
5336 guarantee(v >= 0, "invariant");
5337 if (v != 0) return OS_OK;
5338
5339 int ret = OS_TIMEOUT;
5340 timestruc_t abst;
5341 compute_abstime(&abst, millis);
5342
5343 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5344 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5345 // Only for SPARC >= V8PlusA
5346 #if defined(__sparc) && defined(COMPILER2)
5347 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5348 #endif
5349 int status = os::Solaris::mutex_lock(_mutex);
5350 assert_status(status == 0, status, "mutex_lock");
5351 guarantee(_nParked == 0, "invariant");
5352 ++_nParked;
5353 while (_Event < 0) {
5354 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5355 assert_status(status == 0 || status == EINTR ||
5356 status == ETIME || status == ETIMEDOUT,
5357 status, "cond_timedwait");
5358 if (!FilterSpuriousWakeups) break; // previous semantics
5359 if (status == ETIME || status == ETIMEDOUT) break;
5360 // We consume and ignore EINTR and spurious wakeups.
5361 }
5362 --_nParked;
5363 if (_Event >= 0) ret = OS_OK;
5364 _Event = 0;
5365 status = os::Solaris::mutex_unlock(_mutex);
5366 assert_status(status == 0, status, "mutex_unlock");
5367 // Paranoia to ensure our locked and lock-free paths interact
5368 // correctly with each other.
5369 OrderAccess::fence();
5370 return ret;
5371 }
5372
5373 void os::PlatformEvent::unpark() {
5374 // Transitions for _Event:
5375 // 0 => 1 : just return
5376 // 1 => 1 : just return
5377 // -1 => either 0 or 1; must signal target thread
5378 // That is, we can safely transition _Event from -1 to either
5379 // 0 or 1.
5380 // See also: "Semaphores in Plan 9" by Mullender & Cox
5381 //
5382 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5383 // that it will take two back-to-back park() calls for the owning
5384 // thread to block. This has the benefit of forcing a spurious return
5385 // from the first park() call after an unpark() call which will help
5386 // shake out uses of park() and unpark() without condition variables.
5387
5388 if (Atomic::xchg(1, &_Event) >= 0) return;
5389
5390 // If the thread associated with the event was parked, wake it.
5391 // Wait for the thread assoc with the PlatformEvent to vacate.
5392 int status = os::Solaris::mutex_lock(_mutex);
5393 assert_status(status == 0, status, "mutex_lock");
5394 int AnyWaiters = _nParked;
5395 status = os::Solaris::mutex_unlock(_mutex);
5396 assert_status(status == 0, status, "mutex_unlock");
5397 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5398 if (AnyWaiters != 0) {
5399 // Note that we signal() *after* dropping the lock for "immortal" Events.
5400 // This is safe and avoids a common class of futile wakeups. In rare
5401 // circumstances this can cause a thread to return prematurely from
5402 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5403 // will simply re-test the condition and re-park itself.
5404 // This provides particular benefit if the underlying platform does not
5405 // provide wait morphing.
5406 status = os::Solaris::cond_signal(_cond);
5407 assert_status(status == 0, status, "cond_signal");
5408 }
5409 }
5410
5411 // JSR166
5412 // -------------------------------------------------------
5413
5414 // The solaris and linux implementations of park/unpark are fairly
5415 // conservative for now, but can be improved. They currently use a
5416 // mutex/condvar pair, plus _counter.
5417 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5418 // sets count to 1 and signals condvar. Only one thread ever waits
5419 // on the condvar. Contention seen when trying to park implies that someone
5420 // is unparking you, so don't wait. And spurious returns are fine, so there
5421 // is no need to track notifications.
5422
5423 #define MAX_SECS 100000000
5424
5425 // This code is common to linux and solaris and will be moved to a
5426 // common place in dolphin.
5427 //
5428 // The passed in time value is either a relative time in nanoseconds
5429 // or an absolute time in milliseconds. Either way it has to be unpacked
5430 // into suitable seconds and nanoseconds components and stored in the
5431 // given timespec structure.
5432 // Given time is a 64-bit value and the time_t used in the timespec is only
5433 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5434 // overflow if times way in the future are given. Further on Solaris versions
5435 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5436 // number of seconds, in abstime, is less than current_time + 100,000,000.
5437 // As it will be 28 years before "now + 100000000" will overflow we can
5438 // ignore overflow and just impose a hard-limit on seconds using the value
5439 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5440 // years from "now".
5441 //
5442 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5443 assert(time > 0, "convertTime");
5444
5445 struct timeval now;
5446 int status = gettimeofday(&now, NULL);
5447 assert(status == 0, "gettimeofday");
5448
5449 time_t max_secs = now.tv_sec + MAX_SECS;
5450
5451 if (isAbsolute) {
5452 jlong secs = time / 1000;
5453 if (secs > max_secs) {
5454 absTime->tv_sec = max_secs;
5455 } else {
5456 absTime->tv_sec = secs;
5457 }
5458 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5459 } else {
5460 jlong secs = time / NANOSECS_PER_SEC;
5461 if (secs >= MAX_SECS) {
5462 absTime->tv_sec = max_secs;
5463 absTime->tv_nsec = 0;
5464 } else {
5465 absTime->tv_sec = now.tv_sec + secs;
5466 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5467 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5468 absTime->tv_nsec -= NANOSECS_PER_SEC;
5469 ++absTime->tv_sec; // note: this must be <= max_secs
5470 }
5471 }
5472 }
5473 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5474 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5475 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5476 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5477 }
5478
5479 void Parker::park(bool isAbsolute, jlong time) {
5480 // Ideally we'd do something useful while spinning, such
5481 // as calling unpackTime().
5482
5483 // Optional fast-path check:
5484 // Return immediately if a permit is available.
5485 // We depend on Atomic::xchg() having full barrier semantics
5486 // since we are doing a lock-free update to _counter.
5487 if (Atomic::xchg(0, &_counter) > 0) return;
5488
5489 // Optional fast-exit: Check interrupt before trying to wait
5490 Thread* thread = Thread::current();
5491 assert(thread->is_Java_thread(), "Must be JavaThread");
5492 JavaThread *jt = (JavaThread *)thread;
5493 if (Thread::is_interrupted(thread, false)) {
5494 return;
5495 }
5496
5497 // First, demultiplex/decode time arguments
5498 timespec absTime;
5499 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5500 return;
5501 }
5502 if (time > 0) {
5503 // Warning: this code might be exposed to the old Solaris time
5504 // round-down bugs. Grep "roundingFix" for details.
5505 unpackTime(&absTime, isAbsolute, time);
5506 }
5507
5508 // Enter safepoint region
5509 // Beware of deadlocks such as 6317397.
5510 // The per-thread Parker:: _mutex is a classic leaf-lock.
5511 // In particular a thread must never block on the Threads_lock while
5512 // holding the Parker:: mutex. If safepoints are pending both the
5513 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5514 ThreadBlockInVM tbivm(jt);
5515
5516 // Don't wait if cannot get lock since interference arises from
5517 // unblocking. Also. check interrupt before trying wait
5518 if (Thread::is_interrupted(thread, false) ||
5519 os::Solaris::mutex_trylock(_mutex) != 0) {
5520 return;
5521 }
5522
5523 int status;
5524
5525 if (_counter > 0) { // no wait needed
5526 _counter = 0;
5527 status = os::Solaris::mutex_unlock(_mutex);
5528 assert(status == 0, "invariant");
5529 // Paranoia to ensure our locked and lock-free paths interact
5530 // correctly with each other and Java-level accesses.
5531 OrderAccess::fence();
5532 return;
5533 }
5534
5535 #ifdef ASSERT
5536 // Don't catch signals while blocked; let the running threads have the signals.
5537 // (This allows a debugger to break into the running thread.)
5538 sigset_t oldsigs;
5539 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5540 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5541 #endif
5542
5543 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5544 jt->set_suspend_equivalent();
5545 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5546
5547 // Do this the hard way by blocking ...
5548 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5549 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5550 // Only for SPARC >= V8PlusA
5551 #if defined(__sparc) && defined(COMPILER2)
5552 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5553 #endif
5554
5555 if (time == 0) {
5556 status = os::Solaris::cond_wait(_cond, _mutex);
5557 } else {
5558 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5559 }
5560 // Note that an untimed cond_wait() can sometimes return ETIME on older
5561 // versions of the Solaris.
5562 assert_status(status == 0 || status == EINTR ||
5563 status == ETIME || status == ETIMEDOUT,
5564 status, "cond_timedwait");
5565
5566 #ifdef ASSERT
5567 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
5568 #endif
5569 _counter = 0;
5570 status = os::Solaris::mutex_unlock(_mutex);
5571 assert_status(status == 0, status, "mutex_unlock");
5572 // Paranoia to ensure our locked and lock-free paths interact
5573 // correctly with each other and Java-level accesses.
5574 OrderAccess::fence();
5575
5576 // If externally suspended while waiting, re-suspend
5577 if (jt->handle_special_suspend_equivalent_condition()) {
5578 jt->java_suspend_self();
5579 }
5580 }
5581
5582 void Parker::unpark() {
5583 int status = os::Solaris::mutex_lock(_mutex);
5584 assert(status == 0, "invariant");
5585 const int s = _counter;
5586 _counter = 1;
5587 status = os::Solaris::mutex_unlock(_mutex);
5588 assert(status == 0, "invariant");
5589
5590 if (s < 1) {
5591 status = os::Solaris::cond_signal(_cond);
5592 assert(status == 0, "invariant");
5593 }
5594 }
5595
5596 extern char** environ;
5597
5598 // Run the specified command in a separate process. Return its exit value,
5599 // or -1 on failure (e.g. can't fork a new process).
5600 // Unlike system(), this function can be called from signal handler. It
5601 // doesn't block SIGINT et al.
5602 int os::fork_and_exec(char* cmd) {
5603 char * argv[4];
5604 argv[0] = (char *)"sh";
5605 argv[1] = (char *)"-c";
5606 argv[2] = cmd;
5607 argv[3] = NULL;
5608
5609 // fork is async-safe, fork1 is not so can't use in signal handler
5610 pid_t pid;
5611 Thread* t = Thread::current_or_null_safe();
5612 if (t != NULL && t->is_inside_signal_handler()) {
5613 pid = fork();
5614 } else {
5615 pid = fork1();
5616 }
5617
5618 if (pid < 0) {
5619 // fork failed
5620 warning("fork failed: %s", strerror(errno));
5621 return -1;
5622
5623 } else if (pid == 0) {
5624 // child process
5625
5626 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5627 execve("/usr/bin/sh", argv, environ);
5628
5629 // execve failed
5630 _exit(-1);
5631
5632 } else {
5633 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5634 // care about the actual exit code, for now.
5635
5636 int status;
5637
5638 // Wait for the child process to exit. This returns immediately if
5639 // the child has already exited. */
5640 while (waitpid(pid, &status, 0) < 0) {
5641 switch (errno) {
5642 case ECHILD: return 0;
5643 case EINTR: break;
5644 default: return -1;
5645 }
5646 }
5647
5648 if (WIFEXITED(status)) {
5649 // The child exited normally; get its exit code.
5650 return WEXITSTATUS(status);
5651 } else if (WIFSIGNALED(status)) {
5652 // The child exited because of a signal
5653 // The best value to return is 0x80 + signal number,
5654 // because that is what all Unix shells do, and because
5655 // it allows callers to distinguish between process exit and
5656 // process death by signal.
5657 return 0x80 + WTERMSIG(status);
5658 } else {
5659 // Unknown exit code; pass it through
5660 return status;
5661 }
5662 }
5663 }
5664
5665 // is_headless_jre()
5666 //
5667 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5668 // in order to report if we are running in a headless jre
5669 //
5670 // Since JDK8 xawt/libmawt.so was moved into the same directory
5671 // as libawt.so, and renamed libawt_xawt.so
5672 //
5673 bool os::is_headless_jre() {
5674 struct stat statbuf;
5675 char buf[MAXPATHLEN];
5676 char libmawtpath[MAXPATHLEN];
5677 const char *xawtstr = "/xawt/libmawt.so";
5678 const char *new_xawtstr = "/libawt_xawt.so";
5679 char *p;
5680
5681 // Get path to libjvm.so
5682 os::jvm_path(buf, sizeof(buf));
5683
5684 // Get rid of libjvm.so
5685 p = strrchr(buf, '/');
5686 if (p == NULL) {
5687 return false;
5688 } else {
5689 *p = '\0';
5690 }
5691
5692 // Get rid of client or server
5693 p = strrchr(buf, '/');
5694 if (p == NULL) {
5695 return false;
5696 } else {
5697 *p = '\0';
5698 }
5699
5700 // check xawt/libmawt.so
5701 strcpy(libmawtpath, buf);
5702 strcat(libmawtpath, xawtstr);
5703 if (::stat(libmawtpath, &statbuf) == 0) return false;
5704
5705 // check libawt_xawt.so
5706 strcpy(libmawtpath, buf);
5707 strcat(libmawtpath, new_xawtstr);
5708 if (::stat(libmawtpath, &statbuf) == 0) return false;
5709
5710 return true;
5711 }
5712
5713 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5714 size_t res;
5715 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5716 "Assumed _thread_in_native");
5717 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5718 return res;
5719 }
5720
5721 int os::close(int fd) {
5722 return ::close(fd);
5723 }
5724
5725 int os::socket_close(int fd) {
5726 return ::close(fd);
5727 }
5728
5729 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5730 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5731 "Assumed _thread_in_native");
5732 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5733 }
5734
5735 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5736 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5737 "Assumed _thread_in_native");
5738 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5739 }
5740
5741 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5742 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5743 }
5744
5745 // As both poll and select can be interrupted by signals, we have to be
5746 // prepared to restart the system call after updating the timeout, unless
5747 // a poll() is done with timeout == -1, in which case we repeat with this
5748 // "wait forever" value.
5749
5750 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5751 int _result;
5752 _result = ::connect(fd, him, len);
5753
5754 // On Solaris, when a connect() call is interrupted, the connection
5755 // can be established asynchronously (see 6343810). Subsequent calls
5756 // to connect() must check the errno value which has the semantic
5757 // described below (copied from the connect() man page). Handling
5758 // of asynchronously established connections is required for both
5759 // blocking and non-blocking sockets.
5760 // EINTR The connection attempt was interrupted
5761 // before any data arrived by the delivery of
5762 // a signal. The connection, however, will be
5763 // established asynchronously.
5764 //
5765 // EINPROGRESS The socket is non-blocking, and the connec-
5766 // tion cannot be completed immediately.
5767 //
5768 // EALREADY The socket is non-blocking, and a previous
5769 // connection attempt has not yet been com-
5770 // pleted.
5771 //
5772 // EISCONN The socket is already connected.
5773 if (_result == OS_ERR && errno == EINTR) {
5774 // restarting a connect() changes its errno semantics
5775 RESTARTABLE(::connect(fd, him, len), _result);
5776 // undo these changes
5777 if (_result == OS_ERR) {
5778 if (errno == EALREADY) {
5779 errno = EINPROGRESS; // fall through
5780 } else if (errno == EISCONN) {
5781 errno = 0;
5782 return OS_OK;
5783 }
5784 }
5785 }
5786 return _result;
5787 }
5788
5789 // Get the default path to the core file
5790 // Returns the length of the string
5791 int os::get_core_path(char* buffer, size_t bufferSize) {
5792 const char* p = get_current_directory(buffer, bufferSize);
5793
5794 if (p == NULL) {
5795 assert(p != NULL, "failed to get current directory");
5796 return 0;
5797 }
5798
5799 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5800 p, current_process_id());
5801
5802 return strlen(buffer);
5803 }
5804
5805 #ifndef PRODUCT
5806 void TestReserveMemorySpecial_test() {
5807 // No tests available for this platform
5808 }
5809 #endif