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 OSThread* osthr = thread->osthread();
732
733 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
734 thread->_schedctl = (void *) schedctl_init();
735
736 if (UseNUMA) {
737 int lgrp_id = os::numa_get_group_id();
738 if (lgrp_id != -1) {
739 thread->set_lgrp_id(lgrp_id);
740 }
741 }
742
743 // If the creator called set priority before we started,
744 // we need to call set_native_priority now that we have an lwp.
745 // We used to get the priority from thr_getprio (we called
746 // thr_setprio way back in create_thread) and pass it to
747 // set_native_priority, but Solaris scales the priority
748 // in java_to_os_priority, so when we read it back here,
749 // we pass trash to set_native_priority instead of what's
750 // in java_to_os_priority. So we save the native priority
751 // in the osThread and recall it here.
752
753 if (osthr->thread_id() != -1) {
754 if (UseThreadPriorities) {
755 int prio = osthr->native_priority();
756 if (ThreadPriorityVerbose) {
757 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
758 INTPTR_FORMAT ", setting priority: %d\n",
759 osthr->thread_id(), osthr->lwp_id(), prio);
760 }
761 os::set_native_priority(thread, prio);
762 }
763 } else if (ThreadPriorityVerbose) {
764 warning("Can't set priority in _start routine, thread id hasn't been set\n");
765 }
766
767 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
768
769 // initialize signal mask for this thread
770 os::Solaris::hotspot_sigmask(thread);
771
772 thread->run();
773
774 // One less thread is executing
775 // When the VMThread gets here, the main thread may have already exited
776 // which frees the CodeHeap containing the Atomic::dec code
777 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
778 Atomic::dec(&os::Solaris::_os_thread_count);
779 }
780
781 if (UseDetachedThreads) {
782 thr_exit(NULL);
783 ShouldNotReachHere();
784 }
785 return NULL;
786 }
787
788 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
789 // Allocate the OSThread object
790 OSThread* osthread = new OSThread(NULL, NULL);
791 if (osthread == NULL) return NULL;
792
793 // Store info on the Solaris thread into the OSThread
794 osthread->set_thread_id(thread_id);
795 osthread->set_lwp_id(_lwp_self());
796 thread->_schedctl = (void *) schedctl_init();
797
798 if (UseNUMA) {
799 int lgrp_id = os::numa_get_group_id();
800 if (lgrp_id != -1) {
801 thread->set_lgrp_id(lgrp_id);
802 }
803 }
804
805 if (ThreadPriorityVerbose) {
806 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
807 osthread->thread_id(), osthread->lwp_id());
808 }
809
810 // Initial thread state is INITIALIZED, not SUSPENDED
811 osthread->set_state(INITIALIZED);
812
813 return osthread;
814 }
815
816 void os::Solaris::hotspot_sigmask(Thread* thread) {
817 //Save caller's signal mask
818 sigset_t sigmask;
819 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
820 OSThread *osthread = thread->osthread();
821 osthread->set_caller_sigmask(sigmask);
822
823 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
824 if (!ReduceSignalUsage) {
825 if (thread->is_VM_thread()) {
826 // Only the VM thread handles BREAK_SIGNAL ...
827 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
828 } else {
829 // ... all other threads block BREAK_SIGNAL
830 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
831 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
832 }
833 }
834 }
835
836 bool os::create_attached_thread(JavaThread* thread) {
837 #ifdef ASSERT
838 thread->verify_not_published();
839 #endif
840 OSThread* osthread = create_os_thread(thread, thr_self());
841 if (osthread == NULL) {
842 return false;
843 }
844
845 // Initial thread state is RUNNABLE
846 osthread->set_state(RUNNABLE);
847 thread->set_osthread(osthread);
848
849 // initialize signal mask for this thread
850 // and save the caller's signal mask
851 os::Solaris::hotspot_sigmask(thread);
852
853 return true;
854 }
855
856 bool os::create_main_thread(JavaThread* thread) {
857 #ifdef ASSERT
858 thread->verify_not_published();
859 #endif
860 if (_starting_thread == NULL) {
861 _starting_thread = create_os_thread(thread, main_thread);
862 if (_starting_thread == NULL) {
863 return false;
864 }
865 }
866
867 // The primodial thread is runnable from the start
868 _starting_thread->set_state(RUNNABLE);
869
870 thread->set_osthread(_starting_thread);
871
872 // initialize signal mask for this thread
873 // and save the caller's signal mask
874 os::Solaris::hotspot_sigmask(thread);
875
876 return true;
877 }
878
879
880 bool os::create_thread(Thread* thread, ThreadType thr_type,
881 size_t stack_size) {
882 // Allocate the OSThread object
883 OSThread* osthread = new OSThread(NULL, NULL);
884 if (osthread == NULL) {
885 return false;
886 }
887
888 if (ThreadPriorityVerbose) {
889 char *thrtyp;
890 switch (thr_type) {
891 case vm_thread:
892 thrtyp = (char *)"vm";
893 break;
894 case cgc_thread:
895 thrtyp = (char *)"cgc";
896 break;
897 case pgc_thread:
898 thrtyp = (char *)"pgc";
899 break;
900 case java_thread:
901 thrtyp = (char *)"java";
902 break;
903 case compiler_thread:
904 thrtyp = (char *)"compiler";
905 break;
906 case watcher_thread:
907 thrtyp = (char *)"watcher";
908 break;
909 default:
910 thrtyp = (char *)"unknown";
911 break;
912 }
913 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
914 }
915
916 // Calculate stack size if it's not specified by caller.
917 if (stack_size == 0) {
918 // The default stack size 1M (2M for LP64).
919 stack_size = (BytesPerWord >> 2) * K * K;
920
921 switch (thr_type) {
922 case os::java_thread:
923 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
924 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
925 break;
926 case os::compiler_thread:
927 if (CompilerThreadStackSize > 0) {
928 stack_size = (size_t)(CompilerThreadStackSize * K);
929 break;
930 } // else fall through:
931 // use VMThreadStackSize if CompilerThreadStackSize is not defined
932 case os::vm_thread:
933 case os::pgc_thread:
934 case os::cgc_thread:
935 case os::watcher_thread:
936 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
937 break;
938 }
939 }
940 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
941
942 // Initial state is ALLOCATED but not INITIALIZED
943 osthread->set_state(ALLOCATED);
944
945 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
946 // We got lots of threads. Check if we still have some address space left.
947 // Need to be at least 5Mb of unreserved address space. We do check by
948 // trying to reserve some.
949 const size_t VirtualMemoryBangSize = 20*K*K;
950 char* mem = os::reserve_memory(VirtualMemoryBangSize);
951 if (mem == NULL) {
952 delete osthread;
953 return false;
954 } else {
955 // Release the memory again
956 os::release_memory(mem, VirtualMemoryBangSize);
957 }
958 }
959
960 // Setup osthread because the child thread may need it.
961 thread->set_osthread(osthread);
962
963 // Create the Solaris thread
964 thread_t tid = 0;
965 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
966 int status;
967
968 // Mark that we don't have an lwp or thread id yet.
969 // In case we attempt to set the priority before the thread starts.
970 osthread->set_lwp_id(-1);
971 osthread->set_thread_id(-1);
972
973 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
974 if (status != 0) {
975 if (PrintMiscellaneous && (Verbose || WizardMode)) {
976 perror("os::create_thread");
977 }
978 thread->set_osthread(NULL);
979 // Need to clean up stuff we've allocated so far
980 delete osthread;
981 return false;
982 }
983
984 Atomic::inc(&os::Solaris::_os_thread_count);
985
986 // Store info on the Solaris thread into the OSThread
987 osthread->set_thread_id(tid);
988
989 // Remember that we created this thread so we can set priority on it
990 osthread->set_vm_created();
991
992 // Initial thread state is INITIALIZED, not SUSPENDED
993 osthread->set_state(INITIALIZED);
994
995 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
996 return true;
997 }
998
999 // defined for >= Solaris 10. This allows builds on earlier versions
1000 // of Solaris to take advantage of the newly reserved Solaris JVM signals.
1001 // With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL
1002 // was SIGJVM1.
1003 //
1004 #if !defined(SIGJVM1)
1005 #define SIGJVM1 39
1006 #define SIGJVM2 40
1007 #endif
1008
1009 debug_only(static bool signal_sets_initialized = false);
1010 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1011
1012 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1013
1014 bool os::Solaris::is_sig_ignored(int sig) {
1015 struct sigaction oact;
1016 sigaction(sig, (struct sigaction*)NULL, &oact);
1017 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1018 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1019 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1020 return true;
1021 } else {
1022 return false;
1023 }
1024 }
1025
1026 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1027 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1028 static bool isJVM1available() {
1029 return SIGJVM1 < SIGRTMIN;
1030 }
1031
1032 void os::Solaris::signal_sets_init() {
1033 // Should also have an assertion stating we are still single-threaded.
1034 assert(!signal_sets_initialized, "Already initialized");
1035 // Fill in signals that are necessarily unblocked for all threads in
1036 // the VM. Currently, we unblock the following signals:
1037 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1038 // by -Xrs (=ReduceSignalUsage));
1039 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1040 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1041 // the dispositions or masks wrt these signals.
1042 // Programs embedding the VM that want to use the above signals for their
1043 // own purposes must, at this time, use the "-Xrs" option to prevent
1044 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1045 // (See bug 4345157, and other related bugs).
1046 // In reality, though, unblocking these signals is really a nop, since
1047 // these signals are not blocked by default.
1048 sigemptyset(&unblocked_sigs);
1049 sigemptyset(&allowdebug_blocked_sigs);
1050 sigaddset(&unblocked_sigs, SIGILL);
1051 sigaddset(&unblocked_sigs, SIGSEGV);
1052 sigaddset(&unblocked_sigs, SIGBUS);
1053 sigaddset(&unblocked_sigs, SIGFPE);
1054
1055 // Always true on Solaris 10+
1056 guarantee(isJVM1available(), "SIGJVM1/2 missing!");
1057 os::Solaris::set_SIGasync(SIGJVM2);
1058
1059 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1060
1061 if (!ReduceSignalUsage) {
1062 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1063 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1064 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1065 }
1066 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1067 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1068 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1069 }
1070 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1071 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1072 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1073 }
1074 }
1075 // Fill in signals that are blocked by all but the VM thread.
1076 sigemptyset(&vm_sigs);
1077 if (!ReduceSignalUsage) {
1078 sigaddset(&vm_sigs, BREAK_SIGNAL);
1079 }
1080 debug_only(signal_sets_initialized = true);
1081
1082 // For diagnostics only used in run_periodic_checks
1083 sigemptyset(&check_signal_done);
1084 }
1085
1086 // These are signals that are unblocked while a thread is running Java.
1087 // (For some reason, they get blocked by default.)
1088 sigset_t* os::Solaris::unblocked_signals() {
1089 assert(signal_sets_initialized, "Not initialized");
1090 return &unblocked_sigs;
1091 }
1092
1093 // These are the signals that are blocked while a (non-VM) thread is
1094 // running Java. Only the VM thread handles these signals.
1095 sigset_t* os::Solaris::vm_signals() {
1096 assert(signal_sets_initialized, "Not initialized");
1097 return &vm_sigs;
1098 }
1099
1100 // These are signals that are blocked during cond_wait to allow debugger in
1101 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1102 assert(signal_sets_initialized, "Not initialized");
1103 return &allowdebug_blocked_sigs;
1104 }
1105
1106
1107 void _handle_uncaught_cxx_exception() {
1108 VMError::report_and_die("An uncaught C++ exception");
1109 }
1110
1111
1112 // First crack at OS-specific initialization, from inside the new thread.
1113 void os::initialize_thread(Thread* thr) {
1114 int r = thr_main();
1115 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1116 if (r) {
1117 JavaThread* jt = (JavaThread *)thr;
1118 assert(jt != NULL, "Sanity check");
1119 size_t stack_size;
1120 address base = jt->stack_base();
1121 if (Arguments::created_by_java_launcher()) {
1122 // Use 2MB to allow for Solaris 7 64 bit mode.
1123 stack_size = JavaThread::stack_size_at_create() == 0
1124 ? 2048*K : JavaThread::stack_size_at_create();
1125
1126 // There are rare cases when we may have already used more than
1127 // the basic stack size allotment before this method is invoked.
1128 // Attempt to allow for a normally sized java_stack.
1129 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1130 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1131 } else {
1132 // 6269555: If we were not created by a Java launcher, i.e. if we are
1133 // running embedded in a native application, treat the primordial thread
1134 // as much like a native attached thread as possible. This means using
1135 // the current stack size from thr_stksegment(), unless it is too large
1136 // to reliably setup guard pages. A reasonable max size is 8MB.
1137 size_t current_size = current_stack_size();
1138 // This should never happen, but just in case....
1139 if (current_size == 0) current_size = 2 * K * K;
1140 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1141 }
1142 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1143 stack_size = (size_t)(base - bottom);
1144
1145 assert(stack_size > 0, "Stack size calculation problem");
1146
1147 if (stack_size > jt->stack_size()) {
1148 #ifndef PRODUCT
1149 struct rlimit limits;
1150 getrlimit(RLIMIT_STACK, &limits);
1151 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1152 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1153 #endif
1154 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1155 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1156 "See limit(1) to increase the stack size limit.",
1157 stack_size / K, jt->stack_size() / K);
1158 vm_exit(1);
1159 }
1160 assert(jt->stack_size() >= stack_size,
1161 "Attempt to map more stack than was allocated");
1162 jt->set_stack_size(stack_size);
1163 }
1164
1165 // With the T2 libthread (T1 is no longer supported) threads are always bound
1166 // and we use stackbanging in all cases.
1167
1168 os::Solaris::init_thread_fpu_state();
1169 std::set_terminate(_handle_uncaught_cxx_exception);
1170 }
1171
1172
1173
1174 // Free Solaris resources related to the OSThread
1175 void os::free_thread(OSThread* osthread) {
1176 assert(osthread != NULL, "os::free_thread but osthread not set");
1177
1178
1179 // We are told to free resources of the argument thread,
1180 // but we can only really operate on the current thread.
1181 // The main thread must take the VMThread down synchronously
1182 // before the main thread exits and frees up CodeHeap
1183 guarantee((Thread::current()->osthread() == osthread
1184 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1185 if (Thread::current()->osthread() == osthread) {
1186 // Restore caller's signal mask
1187 sigset_t sigmask = osthread->caller_sigmask();
1188 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1189 }
1190 delete osthread;
1191 }
1192
1193 void os::pd_start_thread(Thread* thread) {
1194 int status = thr_continue(thread->osthread()->thread_id());
1195 assert_status(status == 0, status, "thr_continue failed");
1196 }
1197
1198
1199 intx os::current_thread_id() {
1200 return (intx)thr_self();
1201 }
1202
1203 static pid_t _initial_pid = 0;
1204
1205 int os::current_process_id() {
1206 return (int)(_initial_pid ? _initial_pid : getpid());
1207 }
1208
1209 // gethrtime() should be monotonic according to the documentation,
1210 // but some virtualized platforms are known to break this guarantee.
1211 // getTimeNanos() must be guaranteed not to move backwards, so we
1212 // are forced to add a check here.
1213 inline hrtime_t getTimeNanos() {
1214 const hrtime_t now = gethrtime();
1215 const hrtime_t prev = max_hrtime;
1216 if (now <= prev) {
1217 return prev; // same or retrograde time;
1218 }
1219 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1220 assert(obsv >= prev, "invariant"); // Monotonicity
1221 // If the CAS succeeded then we're done and return "now".
1222 // If the CAS failed and the observed value "obsv" is >= now then
1223 // we should return "obsv". If the CAS failed and now > obsv > prv then
1224 // some other thread raced this thread and installed a new value, in which case
1225 // we could either (a) retry the entire operation, (b) retry trying to install now
1226 // or (c) just return obsv. We use (c). No loop is required although in some cases
1227 // we might discard a higher "now" value in deference to a slightly lower but freshly
1228 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1229 // to (a) or (b) -- and greatly reduces coherence traffic.
1230 // We might also condition (c) on the magnitude of the delta between obsv and now.
1231 // Avoiding excessive CAS operations to hot RW locations is critical.
1232 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1233 return (prev == obsv) ? now : obsv;
1234 }
1235
1236 // Time since start-up in seconds to a fine granularity.
1237 // Used by VMSelfDestructTimer and the MemProfiler.
1238 double os::elapsedTime() {
1239 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1240 }
1241
1242 jlong os::elapsed_counter() {
1243 return (jlong)(getTimeNanos() - first_hrtime);
1244 }
1245
1246 jlong os::elapsed_frequency() {
1247 return hrtime_hz;
1248 }
1249
1250 // Return the real, user, and system times in seconds from an
1251 // arbitrary fixed point in the past.
1252 bool os::getTimesSecs(double* process_real_time,
1253 double* process_user_time,
1254 double* process_system_time) {
1255 struct tms ticks;
1256 clock_t real_ticks = times(&ticks);
1257
1258 if (real_ticks == (clock_t) (-1)) {
1259 return false;
1260 } else {
1261 double ticks_per_second = (double) clock_tics_per_sec;
1262 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1263 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1264 // For consistency return the real time from getTimeNanos()
1265 // converted to seconds.
1266 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1267
1268 return true;
1269 }
1270 }
1271
1272 bool os::supports_vtime() { return true; }
1273
1274 bool os::enable_vtime() {
1275 int fd = ::open("/proc/self/ctl", O_WRONLY);
1276 if (fd == -1) {
1277 return false;
1278 }
1279
1280 long cmd[] = { PCSET, PR_MSACCT };
1281 int res = ::write(fd, cmd, sizeof(long) * 2);
1282 ::close(fd);
1283 if (res != sizeof(long) * 2) {
1284 return false;
1285 }
1286 return true;
1287 }
1288
1289 bool os::vtime_enabled() {
1290 int fd = ::open("/proc/self/status", O_RDONLY);
1291 if (fd == -1) {
1292 return false;
1293 }
1294
1295 pstatus_t status;
1296 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1297 ::close(fd);
1298 if (res != sizeof(pstatus_t)) {
1299 return false;
1300 }
1301 return status.pr_flags & PR_MSACCT;
1302 }
1303
1304 double os::elapsedVTime() {
1305 return (double)gethrvtime() / (double)hrtime_hz;
1306 }
1307
1308 // Used internally for comparisons only
1309 // getTimeMillis guaranteed to not move backwards on Solaris
1310 jlong getTimeMillis() {
1311 jlong nanotime = getTimeNanos();
1312 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1313 }
1314
1315 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1316 jlong os::javaTimeMillis() {
1317 timeval t;
1318 if (gettimeofday(&t, NULL) == -1) {
1319 fatal("os::javaTimeMillis: gettimeofday (%s)", strerror(errno));
1320 }
1321 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1322 }
1323
1324 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1325 timeval t;
1326 if (gettimeofday(&t, NULL) == -1) {
1327 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", strerror(errno));
1328 }
1329 seconds = jlong(t.tv_sec);
1330 nanos = jlong(t.tv_usec) * 1000;
1331 }
1332
1333
1334 jlong os::javaTimeNanos() {
1335 return (jlong)getTimeNanos();
1336 }
1337
1338 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1339 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1340 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1341 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1342 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1343 }
1344
1345 char * os::local_time_string(char *buf, size_t buflen) {
1346 struct tm t;
1347 time_t long_time;
1348 time(&long_time);
1349 localtime_r(&long_time, &t);
1350 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1351 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1352 t.tm_hour, t.tm_min, t.tm_sec);
1353 return buf;
1354 }
1355
1356 // Note: os::shutdown() might be called very early during initialization, or
1357 // called from signal handler. Before adding something to os::shutdown(), make
1358 // sure it is async-safe and can handle partially initialized VM.
1359 void os::shutdown() {
1360
1361 // allow PerfMemory to attempt cleanup of any persistent resources
1362 perfMemory_exit();
1363
1364 // needs to remove object in file system
1365 AttachListener::abort();
1366
1367 // flush buffered output, finish log files
1368 ostream_abort();
1369
1370 // Check for abort hook
1371 abort_hook_t abort_hook = Arguments::abort_hook();
1372 if (abort_hook != NULL) {
1373 abort_hook();
1374 }
1375 }
1376
1377 // Note: os::abort() might be called very early during initialization, or
1378 // called from signal handler. Before adding something to os::abort(), make
1379 // sure it is async-safe and can handle partially initialized VM.
1380 void os::abort(bool dump_core, void* siginfo, void* context) {
1381 os::shutdown();
1382 if (dump_core) {
1383 #ifndef PRODUCT
1384 fdStream out(defaultStream::output_fd());
1385 out.print_raw("Current thread is ");
1386 char buf[16];
1387 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1388 out.print_raw_cr(buf);
1389 out.print_raw_cr("Dumping core ...");
1390 #endif
1391 ::abort(); // dump core (for debugging)
1392 }
1393
1394 ::exit(1);
1395 }
1396
1397 // Die immediately, no exit hook, no abort hook, no cleanup.
1398 void os::die() {
1399 ::abort(); // dump core (for debugging)
1400 }
1401
1402 // DLL functions
1403
1404 const char* os::dll_file_extension() { return ".so"; }
1405
1406 // This must be hard coded because it's the system's temporary
1407 // directory not the java application's temp directory, ala java.io.tmpdir.
1408 const char* os::get_temp_directory() { return "/tmp"; }
1409
1410 static bool file_exists(const char* filename) {
1411 struct stat statbuf;
1412 if (filename == NULL || strlen(filename) == 0) {
1413 return false;
1414 }
1415 return os::stat(filename, &statbuf) == 0;
1416 }
1417
1418 bool os::dll_build_name(char* buffer, size_t buflen,
1419 const char* pname, const char* fname) {
1420 bool retval = false;
1421 const size_t pnamelen = pname ? strlen(pname) : 0;
1422
1423 // Return error on buffer overflow.
1424 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1425 return retval;
1426 }
1427
1428 if (pnamelen == 0) {
1429 snprintf(buffer, buflen, "lib%s.so", fname);
1430 retval = true;
1431 } else if (strchr(pname, *os::path_separator()) != NULL) {
1432 int n;
1433 char** pelements = split_path(pname, &n);
1434 if (pelements == NULL) {
1435 return false;
1436 }
1437 for (int i = 0; i < n; i++) {
1438 // really shouldn't be NULL but what the heck, check can't hurt
1439 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1440 continue; // skip the empty path values
1441 }
1442 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1443 if (file_exists(buffer)) {
1444 retval = true;
1445 break;
1446 }
1447 }
1448 // release the storage
1449 for (int i = 0; i < n; i++) {
1450 if (pelements[i] != NULL) {
1451 FREE_C_HEAP_ARRAY(char, pelements[i]);
1452 }
1453 }
1454 if (pelements != NULL) {
1455 FREE_C_HEAP_ARRAY(char*, pelements);
1456 }
1457 } else {
1458 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1459 retval = true;
1460 }
1461 return retval;
1462 }
1463
1464 // check if addr is inside libjvm.so
1465 bool os::address_is_in_vm(address addr) {
1466 static address libjvm_base_addr;
1467 Dl_info dlinfo;
1468
1469 if (libjvm_base_addr == NULL) {
1470 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1471 libjvm_base_addr = (address)dlinfo.dli_fbase;
1472 }
1473 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1474 }
1475
1476 if (dladdr((void *)addr, &dlinfo) != 0) {
1477 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1478 }
1479
1480 return false;
1481 }
1482
1483 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1484 static dladdr1_func_type dladdr1_func = NULL;
1485
1486 bool os::dll_address_to_function_name(address addr, char *buf,
1487 int buflen, int * offset,
1488 bool demangle) {
1489 // buf is not optional, but offset is optional
1490 assert(buf != NULL, "sanity check");
1491
1492 Dl_info dlinfo;
1493
1494 // dladdr1_func was initialized in os::init()
1495 if (dladdr1_func != NULL) {
1496 // yes, we have dladdr1
1497
1498 // Support for dladdr1 is checked at runtime; it may be
1499 // available even if the vm is built on a machine that does
1500 // not have dladdr1 support. Make sure there is a value for
1501 // RTLD_DL_SYMENT.
1502 #ifndef RTLD_DL_SYMENT
1503 #define RTLD_DL_SYMENT 1
1504 #endif
1505 #ifdef _LP64
1506 Elf64_Sym * info;
1507 #else
1508 Elf32_Sym * info;
1509 #endif
1510 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1511 RTLD_DL_SYMENT) != 0) {
1512 // see if we have a matching symbol that covers our address
1513 if (dlinfo.dli_saddr != NULL &&
1514 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1515 if (dlinfo.dli_sname != NULL) {
1516 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1517 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1518 }
1519 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1520 return true;
1521 }
1522 }
1523 // no matching symbol so try for just file info
1524 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1525 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1526 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1527 return true;
1528 }
1529 }
1530 }
1531 buf[0] = '\0';
1532 if (offset != NULL) *offset = -1;
1533 return false;
1534 }
1535
1536 // no, only dladdr is available
1537 if (dladdr((void *)addr, &dlinfo) != 0) {
1538 // see if we have a matching symbol
1539 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1540 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1541 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1542 }
1543 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1544 return true;
1545 }
1546 // no matching symbol so try for just file info
1547 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1548 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1549 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1550 return true;
1551 }
1552 }
1553 }
1554 buf[0] = '\0';
1555 if (offset != NULL) *offset = -1;
1556 return false;
1557 }
1558
1559 bool os::dll_address_to_library_name(address addr, char* buf,
1560 int buflen, int* offset) {
1561 // buf is not optional, but offset is optional
1562 assert(buf != NULL, "sanity check");
1563
1564 Dl_info dlinfo;
1565
1566 if (dladdr((void*)addr, &dlinfo) != 0) {
1567 if (dlinfo.dli_fname != NULL) {
1568 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1569 }
1570 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1571 *offset = addr - (address)dlinfo.dli_fbase;
1572 }
1573 return true;
1574 }
1575
1576 buf[0] = '\0';
1577 if (offset) *offset = -1;
1578 return false;
1579 }
1580
1581 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1582 Dl_info dli;
1583 // Sanity check?
1584 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1585 dli.dli_fname == NULL) {
1586 return 1;
1587 }
1588
1589 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1590 if (handle == NULL) {
1591 return 1;
1592 }
1593
1594 Link_map *map;
1595 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1596 if (map == NULL) {
1597 dlclose(handle);
1598 return 1;
1599 }
1600
1601 while (map->l_prev != NULL) {
1602 map = map->l_prev;
1603 }
1604
1605 while (map != NULL) {
1606 // Iterate through all map entries and call callback with fields of interest
1607 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1608 dlclose(handle);
1609 return 1;
1610 }
1611 map = map->l_next;
1612 }
1613
1614 dlclose(handle);
1615 return 0;
1616 }
1617
1618 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1619 outputStream * out = (outputStream *) param;
1620 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1621 return 0;
1622 }
1623
1624 void os::print_dll_info(outputStream * st) {
1625 st->print_cr("Dynamic libraries:"); st->flush();
1626 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1627 st->print_cr("Error: Cannot print dynamic libraries.");
1628 }
1629 }
1630
1631 // Loads .dll/.so and
1632 // in case of error it checks if .dll/.so was built for the
1633 // same architecture as Hotspot is running on
1634
1635 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1636 void * result= ::dlopen(filename, RTLD_LAZY);
1637 if (result != NULL) {
1638 // Successful loading
1639 return result;
1640 }
1641
1642 Elf32_Ehdr elf_head;
1643
1644 // Read system error message into ebuf
1645 // It may or may not be overwritten below
1646 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1647 ebuf[ebuflen-1]='\0';
1648 int diag_msg_max_length=ebuflen-strlen(ebuf);
1649 char* diag_msg_buf=ebuf+strlen(ebuf);
1650
1651 if (diag_msg_max_length==0) {
1652 // No more space in ebuf for additional diagnostics message
1653 return NULL;
1654 }
1655
1656
1657 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1658
1659 if (file_descriptor < 0) {
1660 // Can't open library, report dlerror() message
1661 return NULL;
1662 }
1663
1664 bool failed_to_read_elf_head=
1665 (sizeof(elf_head)!=
1666 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1667
1668 ::close(file_descriptor);
1669 if (failed_to_read_elf_head) {
1670 // file i/o error - report dlerror() msg
1671 return NULL;
1672 }
1673
1674 typedef struct {
1675 Elf32_Half code; // Actual value as defined in elf.h
1676 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1677 char elf_class; // 32 or 64 bit
1678 char endianess; // MSB or LSB
1679 char* name; // String representation
1680 } arch_t;
1681
1682 static const arch_t arch_array[]={
1683 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1684 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1685 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1686 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1687 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1688 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1689 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1690 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1691 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1692 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1693 };
1694
1695 #if (defined IA32)
1696 static Elf32_Half running_arch_code=EM_386;
1697 #elif (defined AMD64)
1698 static Elf32_Half running_arch_code=EM_X86_64;
1699 #elif (defined IA64)
1700 static Elf32_Half running_arch_code=EM_IA_64;
1701 #elif (defined __sparc) && (defined _LP64)
1702 static Elf32_Half running_arch_code=EM_SPARCV9;
1703 #elif (defined __sparc) && (!defined _LP64)
1704 static Elf32_Half running_arch_code=EM_SPARC;
1705 #elif (defined __powerpc64__)
1706 static Elf32_Half running_arch_code=EM_PPC64;
1707 #elif (defined __powerpc__)
1708 static Elf32_Half running_arch_code=EM_PPC;
1709 #elif (defined ARM)
1710 static Elf32_Half running_arch_code=EM_ARM;
1711 #else
1712 #error Method os::dll_load requires that one of following is defined:\
1713 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1714 #endif
1715
1716 // Identify compatability class for VM's architecture and library's architecture
1717 // Obtain string descriptions for architectures
1718
1719 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1720 int running_arch_index=-1;
1721
1722 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1723 if (running_arch_code == arch_array[i].code) {
1724 running_arch_index = i;
1725 }
1726 if (lib_arch.code == arch_array[i].code) {
1727 lib_arch.compat_class = arch_array[i].compat_class;
1728 lib_arch.name = arch_array[i].name;
1729 }
1730 }
1731
1732 assert(running_arch_index != -1,
1733 "Didn't find running architecture code (running_arch_code) in arch_array");
1734 if (running_arch_index == -1) {
1735 // Even though running architecture detection failed
1736 // we may still continue with reporting dlerror() message
1737 return NULL;
1738 }
1739
1740 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1741 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1742 return NULL;
1743 }
1744
1745 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1746 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1747 return NULL;
1748 }
1749
1750 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1751 if (lib_arch.name!=NULL) {
1752 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1753 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1754 lib_arch.name, arch_array[running_arch_index].name);
1755 } else {
1756 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1757 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1758 lib_arch.code,
1759 arch_array[running_arch_index].name);
1760 }
1761 }
1762
1763 return NULL;
1764 }
1765
1766 void* os::dll_lookup(void* handle, const char* name) {
1767 return dlsym(handle, name);
1768 }
1769
1770 void* os::get_default_process_handle() {
1771 return (void*)::dlopen(NULL, RTLD_LAZY);
1772 }
1773
1774 int os::stat(const char *path, struct stat *sbuf) {
1775 char pathbuf[MAX_PATH];
1776 if (strlen(path) > MAX_PATH - 1) {
1777 errno = ENAMETOOLONG;
1778 return -1;
1779 }
1780 os::native_path(strcpy(pathbuf, path));
1781 return ::stat(pathbuf, sbuf);
1782 }
1783
1784 static bool _print_ascii_file(const char* filename, outputStream* st) {
1785 int fd = ::open(filename, O_RDONLY);
1786 if (fd == -1) {
1787 return false;
1788 }
1789
1790 char buf[32];
1791 int bytes;
1792 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1793 st->print_raw(buf, bytes);
1794 }
1795
1796 ::close(fd);
1797
1798 return true;
1799 }
1800
1801 void os::print_os_info_brief(outputStream* st) {
1802 os::Solaris::print_distro_info(st);
1803
1804 os::Posix::print_uname_info(st);
1805
1806 os::Solaris::print_libversion_info(st);
1807 }
1808
1809 void os::print_os_info(outputStream* st) {
1810 st->print("OS:");
1811
1812 os::Solaris::print_distro_info(st);
1813
1814 os::Posix::print_uname_info(st);
1815
1816 os::Solaris::print_libversion_info(st);
1817
1818 os::Posix::print_rlimit_info(st);
1819
1820 os::Posix::print_load_average(st);
1821 }
1822
1823 void os::Solaris::print_distro_info(outputStream* st) {
1824 if (!_print_ascii_file("/etc/release", st)) {
1825 st->print("Solaris");
1826 }
1827 st->cr();
1828 }
1829
1830 void os::get_summary_os_info(char* buf, size_t buflen) {
1831 strncpy(buf, "Solaris", buflen); // default to plain solaris
1832 FILE* fp = fopen("/etc/release", "r");
1833 if (fp != NULL) {
1834 char tmp[256];
1835 // Only get the first line and chop out everything but the os name.
1836 if (fgets(tmp, sizeof(tmp), fp)) {
1837 char* ptr = tmp;
1838 // skip past whitespace characters
1839 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1840 if (*ptr != '\0') {
1841 char* nl = strchr(ptr, '\n');
1842 if (nl != NULL) *nl = '\0';
1843 strncpy(buf, ptr, buflen);
1844 }
1845 }
1846 fclose(fp);
1847 }
1848 }
1849
1850 void os::Solaris::print_libversion_info(outputStream* st) {
1851 st->print(" (T2 libthread)");
1852 st->cr();
1853 }
1854
1855 static bool check_addr0(outputStream* st) {
1856 jboolean status = false;
1857 int fd = ::open("/proc/self/map",O_RDONLY);
1858 if (fd >= 0) {
1859 prmap_t p;
1860 while (::read(fd, &p, sizeof(p)) > 0) {
1861 if (p.pr_vaddr == 0x0) {
1862 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
1863 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
1864 st->print("Access:");
1865 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
1866 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
1867 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
1868 st->cr();
1869 status = true;
1870 }
1871 }
1872 ::close(fd);
1873 }
1874 return status;
1875 }
1876
1877 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1878 // Get MHz with system call. We don't seem to already have this.
1879 processor_info_t stats;
1880 processorid_t id = getcpuid();
1881 int clock = 0;
1882 if (processor_info(id, &stats) != -1) {
1883 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1884 }
1885 #ifdef AMD64
1886 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1887 #else
1888 // must be sparc
1889 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1890 #endif
1891 }
1892
1893 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1894 // Nothing to do for now.
1895 }
1896
1897 void os::print_memory_info(outputStream* st) {
1898 st->print("Memory:");
1899 st->print(" %dk page", os::vm_page_size()>>10);
1900 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1901 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1902 st->cr();
1903 (void) check_addr0(st);
1904 }
1905
1906 void os::print_siginfo(outputStream* st, void* siginfo) {
1907 const siginfo_t* si = (const siginfo_t*)siginfo;
1908
1909 os::Posix::print_siginfo_brief(st, si);
1910
1911 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
1912 UseSharedSpaces) {
1913 FileMapInfo* mapinfo = FileMapInfo::current_info();
1914 if (mapinfo->is_in_shared_space(si->si_addr)) {
1915 st->print("\n\nError accessing class data sharing archive." \
1916 " Mapped file inaccessible during execution, " \
1917 " possible disk/network problem.");
1918 }
1919 }
1920 st->cr();
1921 }
1922
1923 // Moved from whole group, because we need them here for diagnostic
1924 // prints.
1925 #define OLDMAXSIGNUM 32
1926 static int Maxsignum = 0;
1927 static int *ourSigFlags = NULL;
1928
1929 int os::Solaris::get_our_sigflags(int sig) {
1930 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1931 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1932 return ourSigFlags[sig];
1933 }
1934
1935 void os::Solaris::set_our_sigflags(int sig, int flags) {
1936 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1937 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1938 ourSigFlags[sig] = flags;
1939 }
1940
1941
1942 static const char* get_signal_handler_name(address handler,
1943 char* buf, int buflen) {
1944 int offset;
1945 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1946 if (found) {
1947 // skip directory names
1948 const char *p1, *p2;
1949 p1 = buf;
1950 size_t len = strlen(os::file_separator());
1951 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1952 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1953 } else {
1954 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1955 }
1956 return buf;
1957 }
1958
1959 static void print_signal_handler(outputStream* st, int sig,
1960 char* buf, size_t buflen) {
1961 struct sigaction sa;
1962
1963 sigaction(sig, NULL, &sa);
1964
1965 st->print("%s: ", os::exception_name(sig, buf, buflen));
1966
1967 address handler = (sa.sa_flags & SA_SIGINFO)
1968 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1969 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1970
1971 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1972 st->print("SIG_DFL");
1973 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1974 st->print("SIG_IGN");
1975 } else {
1976 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1977 }
1978
1979 st->print(", sa_mask[0]=");
1980 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1981
1982 address rh = VMError::get_resetted_sighandler(sig);
1983 // May be, handler was resetted by VMError?
1984 if (rh != NULL) {
1985 handler = rh;
1986 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1987 }
1988
1989 st->print(", sa_flags=");
1990 os::Posix::print_sa_flags(st, sa.sa_flags);
1991
1992 // Check: is it our handler?
1993 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1994 // It is our signal handler
1995 // check for flags
1996 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1997 st->print(
1998 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1999 os::Solaris::get_our_sigflags(sig));
2000 }
2001 }
2002 st->cr();
2003 }
2004
2005 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2006 st->print_cr("Signal Handlers:");
2007 print_signal_handler(st, SIGSEGV, buf, buflen);
2008 print_signal_handler(st, SIGBUS , buf, buflen);
2009 print_signal_handler(st, SIGFPE , buf, buflen);
2010 print_signal_handler(st, SIGPIPE, buf, buflen);
2011 print_signal_handler(st, SIGXFSZ, buf, buflen);
2012 print_signal_handler(st, SIGILL , buf, buflen);
2013 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2014 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2015 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2016 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2017 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2018 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2019 }
2020
2021 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2022
2023 // Find the full path to the current module, libjvm.so
2024 void os::jvm_path(char *buf, jint buflen) {
2025 // Error checking.
2026 if (buflen < MAXPATHLEN) {
2027 assert(false, "must use a large-enough buffer");
2028 buf[0] = '\0';
2029 return;
2030 }
2031 // Lazy resolve the path to current module.
2032 if (saved_jvm_path[0] != 0) {
2033 strcpy(buf, saved_jvm_path);
2034 return;
2035 }
2036
2037 Dl_info dlinfo;
2038 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2039 assert(ret != 0, "cannot locate libjvm");
2040 if (ret != 0 && dlinfo.dli_fname != NULL) {
2041 realpath((char *)dlinfo.dli_fname, buf);
2042 } else {
2043 buf[0] = '\0';
2044 return;
2045 }
2046
2047 if (Arguments::sun_java_launcher_is_altjvm()) {
2048 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2049 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2050 // If "/jre/lib/" appears at the right place in the string, then
2051 // assume we are installed in a JDK and we're done. Otherwise, check
2052 // for a JAVA_HOME environment variable and fix up the path so it
2053 // looks like libjvm.so is installed there (append a fake suffix
2054 // hotspot/libjvm.so).
2055 const char *p = buf + strlen(buf) - 1;
2056 for (int count = 0; p > buf && count < 5; ++count) {
2057 for (--p; p > buf && *p != '/'; --p)
2058 /* empty */ ;
2059 }
2060
2061 if (strncmp(p, "/jre/lib/", 9) != 0) {
2062 // Look for JAVA_HOME in the environment.
2063 char* java_home_var = ::getenv("JAVA_HOME");
2064 if (java_home_var != NULL && java_home_var[0] != 0) {
2065 char cpu_arch[12];
2066 char* jrelib_p;
2067 int len;
2068 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2069 #ifdef _LP64
2070 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2071 if (strcmp(cpu_arch, "sparc") == 0) {
2072 strcat(cpu_arch, "v9");
2073 } else if (strcmp(cpu_arch, "i386") == 0) {
2074 strcpy(cpu_arch, "amd64");
2075 }
2076 #endif
2077 // Check the current module name "libjvm.so".
2078 p = strrchr(buf, '/');
2079 assert(strstr(p, "/libjvm") == p, "invalid library name");
2080
2081 realpath(java_home_var, buf);
2082 // determine if this is a legacy image or modules image
2083 // modules image doesn't have "jre" subdirectory
2084 len = strlen(buf);
2085 assert(len < buflen, "Ran out of buffer space");
2086 jrelib_p = buf + len;
2087 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2088 if (0 != access(buf, F_OK)) {
2089 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2090 }
2091
2092 if (0 == access(buf, F_OK)) {
2093 // Use current module name "libjvm.so"
2094 len = strlen(buf);
2095 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2096 } else {
2097 // Go back to path of .so
2098 realpath((char *)dlinfo.dli_fname, buf);
2099 }
2100 }
2101 }
2102 }
2103
2104 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2105 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2106 }
2107
2108
2109 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2110 // no prefix required, not even "_"
2111 }
2112
2113
2114 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2115 // no suffix required
2116 }
2117
2118 // This method is a copy of JDK's sysGetLastErrorString
2119 // from src/solaris/hpi/src/system_md.c
2120
2121 size_t os::lasterror(char *buf, size_t len) {
2122 if (errno == 0) return 0;
2123
2124 const char *s = ::strerror(errno);
2125 size_t n = ::strlen(s);
2126 if (n >= len) {
2127 n = len - 1;
2128 }
2129 ::strncpy(buf, s, n);
2130 buf[n] = '\0';
2131 return n;
2132 }
2133
2134
2135 // sun.misc.Signal
2136
2137 extern "C" {
2138 static void UserHandler(int sig, void *siginfo, void *context) {
2139 // Ctrl-C is pressed during error reporting, likely because the error
2140 // handler fails to abort. Let VM die immediately.
2141 if (sig == SIGINT && is_error_reported()) {
2142 os::die();
2143 }
2144
2145 os::signal_notify(sig);
2146 // We do not need to reinstate the signal handler each time...
2147 }
2148 }
2149
2150 void* os::user_handler() {
2151 return CAST_FROM_FN_PTR(void*, UserHandler);
2152 }
2153
2154 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2155 struct timespec ts;
2156 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2157
2158 return ts;
2159 }
2160
2161 extern "C" {
2162 typedef void (*sa_handler_t)(int);
2163 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2164 }
2165
2166 void* os::signal(int signal_number, void* handler) {
2167 struct sigaction sigAct, oldSigAct;
2168 sigfillset(&(sigAct.sa_mask));
2169 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2170 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2171
2172 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2173 // -1 means registration failed
2174 return (void *)-1;
2175 }
2176
2177 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2178 }
2179
2180 void os::signal_raise(int signal_number) {
2181 raise(signal_number);
2182 }
2183
2184 // The following code is moved from os.cpp for making this
2185 // code platform specific, which it is by its very nature.
2186
2187 // a counter for each possible signal value
2188 static int Sigexit = 0;
2189 static int Maxlibjsigsigs;
2190 static jint *pending_signals = NULL;
2191 static int *preinstalled_sigs = NULL;
2192 static struct sigaction *chainedsigactions = NULL;
2193 static sema_t sig_sem;
2194 typedef int (*version_getting_t)();
2195 version_getting_t os::Solaris::get_libjsig_version = NULL;
2196 static int libjsigversion = NULL;
2197
2198 int os::sigexitnum_pd() {
2199 assert(Sigexit > 0, "signal memory not yet initialized");
2200 return Sigexit;
2201 }
2202
2203 void os::Solaris::init_signal_mem() {
2204 // Initialize signal structures
2205 Maxsignum = SIGRTMAX;
2206 Sigexit = Maxsignum+1;
2207 assert(Maxsignum >0, "Unable to obtain max signal number");
2208
2209 Maxlibjsigsigs = Maxsignum;
2210
2211 // pending_signals has one int per signal
2212 // The additional signal is for SIGEXIT - exit signal to signal_thread
2213 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2214 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2215
2216 if (UseSignalChaining) {
2217 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2218 * (Maxsignum + 1), mtInternal);
2219 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2220 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2221 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2222 }
2223 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2224 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2225 }
2226
2227 void os::signal_init_pd() {
2228 int ret;
2229
2230 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2231 assert(ret == 0, "sema_init() failed");
2232 }
2233
2234 void os::signal_notify(int signal_number) {
2235 int ret;
2236
2237 Atomic::inc(&pending_signals[signal_number]);
2238 ret = ::sema_post(&sig_sem);
2239 assert(ret == 0, "sema_post() failed");
2240 }
2241
2242 static int check_pending_signals(bool wait_for_signal) {
2243 int ret;
2244 while (true) {
2245 for (int i = 0; i < Sigexit + 1; i++) {
2246 jint n = pending_signals[i];
2247 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2248 return i;
2249 }
2250 }
2251 if (!wait_for_signal) {
2252 return -1;
2253 }
2254 JavaThread *thread = JavaThread::current();
2255 ThreadBlockInVM tbivm(thread);
2256
2257 bool threadIsSuspended;
2258 do {
2259 thread->set_suspend_equivalent();
2260 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2261 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2262 ;
2263 assert(ret == 0, "sema_wait() failed");
2264
2265 // were we externally suspended while we were waiting?
2266 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2267 if (threadIsSuspended) {
2268 // The semaphore has been incremented, but while we were waiting
2269 // another thread suspended us. We don't want to continue running
2270 // while suspended because that would surprise the thread that
2271 // suspended us.
2272 ret = ::sema_post(&sig_sem);
2273 assert(ret == 0, "sema_post() failed");
2274
2275 thread->java_suspend_self();
2276 }
2277 } while (threadIsSuspended);
2278 }
2279 }
2280
2281 int os::signal_lookup() {
2282 return check_pending_signals(false);
2283 }
2284
2285 int os::signal_wait() {
2286 return check_pending_signals(true);
2287 }
2288
2289 ////////////////////////////////////////////////////////////////////////////////
2290 // Virtual Memory
2291
2292 static int page_size = -1;
2293
2294 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2295 // clear this var if support is not available.
2296 static bool has_map_align = true;
2297
2298 int os::vm_page_size() {
2299 assert(page_size != -1, "must call os::init");
2300 return page_size;
2301 }
2302
2303 // Solaris allocates memory by pages.
2304 int os::vm_allocation_granularity() {
2305 assert(page_size != -1, "must call os::init");
2306 return page_size;
2307 }
2308
2309 static bool recoverable_mmap_error(int err) {
2310 // See if the error is one we can let the caller handle. This
2311 // list of errno values comes from the Solaris mmap(2) man page.
2312 switch (err) {
2313 case EBADF:
2314 case EINVAL:
2315 case ENOTSUP:
2316 // let the caller deal with these errors
2317 return true;
2318
2319 default:
2320 // Any remaining errors on this OS can cause our reserved mapping
2321 // to be lost. That can cause confusion where different data
2322 // structures think they have the same memory mapped. The worst
2323 // scenario is if both the VM and a library think they have the
2324 // same memory mapped.
2325 return false;
2326 }
2327 }
2328
2329 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2330 int err) {
2331 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2332 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2333 strerror(err), err);
2334 }
2335
2336 static void warn_fail_commit_memory(char* addr, size_t bytes,
2337 size_t alignment_hint, bool exec,
2338 int err) {
2339 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2340 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2341 alignment_hint, exec, strerror(err), err);
2342 }
2343
2344 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2345 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2346 size_t size = bytes;
2347 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2348 if (res != NULL) {
2349 if (UseNUMAInterleaving) {
2350 numa_make_global(addr, bytes);
2351 }
2352 return 0;
2353 }
2354
2355 int err = errno; // save errno from mmap() call in mmap_chunk()
2356
2357 if (!recoverable_mmap_error(err)) {
2358 warn_fail_commit_memory(addr, bytes, exec, err);
2359 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2360 }
2361
2362 return err;
2363 }
2364
2365 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2366 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2367 }
2368
2369 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2370 const char* mesg) {
2371 assert(mesg != NULL, "mesg must be specified");
2372 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2373 if (err != 0) {
2374 // the caller wants all commit errors to exit with the specified mesg:
2375 warn_fail_commit_memory(addr, bytes, exec, err);
2376 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2377 }
2378 }
2379
2380 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2381 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2382 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2383 alignment, (size_t) vm_page_size());
2384
2385 for (int i = 0; _page_sizes[i] != 0; i++) {
2386 if (is_size_aligned(alignment, _page_sizes[i])) {
2387 return _page_sizes[i];
2388 }
2389 }
2390
2391 return (size_t) vm_page_size();
2392 }
2393
2394 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2395 size_t alignment_hint, bool exec) {
2396 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2397 if (err == 0 && UseLargePages && alignment_hint > 0) {
2398 assert(is_size_aligned(bytes, alignment_hint),
2399 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2400
2401 // The syscall memcntl requires an exact page size (see man memcntl for details).
2402 size_t page_size = page_size_for_alignment(alignment_hint);
2403 if (page_size > (size_t) vm_page_size()) {
2404 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2405 }
2406 }
2407 return err;
2408 }
2409
2410 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2411 bool exec) {
2412 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2413 }
2414
2415 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2416 size_t alignment_hint, bool exec,
2417 const char* mesg) {
2418 assert(mesg != NULL, "mesg must be specified");
2419 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2420 if (err != 0) {
2421 // the caller wants all commit errors to exit with the specified mesg:
2422 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2423 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2424 }
2425 }
2426
2427 // Uncommit the pages in a specified region.
2428 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2429 if (madvise(addr, bytes, MADV_FREE) < 0) {
2430 debug_only(warning("MADV_FREE failed."));
2431 return;
2432 }
2433 }
2434
2435 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2436 return os::commit_memory(addr, size, !ExecMem);
2437 }
2438
2439 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2440 return os::uncommit_memory(addr, size);
2441 }
2442
2443 // Change the page size in a given range.
2444 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2445 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2446 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2447 if (UseLargePages) {
2448 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2449 if (page_size > (size_t) vm_page_size()) {
2450 Solaris::setup_large_pages(addr, bytes, page_size);
2451 }
2452 }
2453 }
2454
2455 // Tell the OS to make the range local to the first-touching LWP
2456 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2457 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2458 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2459 debug_only(warning("MADV_ACCESS_LWP failed."));
2460 }
2461 }
2462
2463 // Tell the OS that this range would be accessed from different LWPs.
2464 void os::numa_make_global(char *addr, size_t bytes) {
2465 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2466 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2467 debug_only(warning("MADV_ACCESS_MANY failed."));
2468 }
2469 }
2470
2471 // Get the number of the locality groups.
2472 size_t os::numa_get_groups_num() {
2473 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2474 return n != -1 ? n : 1;
2475 }
2476
2477 // Get a list of leaf locality groups. A leaf lgroup is group that
2478 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2479 // board. An LWP is assigned to one of these groups upon creation.
2480 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2481 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2482 ids[0] = 0;
2483 return 1;
2484 }
2485 int result_size = 0, top = 1, bottom = 0, cur = 0;
2486 for (int k = 0; k < size; k++) {
2487 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2488 (Solaris::lgrp_id_t*)&ids[top], size - top);
2489 if (r == -1) {
2490 ids[0] = 0;
2491 return 1;
2492 }
2493 if (!r) {
2494 // That's a leaf node.
2495 assert(bottom <= cur, "Sanity check");
2496 // Check if the node has memory
2497 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2498 NULL, 0, LGRP_RSRC_MEM) > 0) {
2499 ids[bottom++] = ids[cur];
2500 }
2501 }
2502 top += r;
2503 cur++;
2504 }
2505 if (bottom == 0) {
2506 // Handle a situation, when the OS reports no memory available.
2507 // Assume UMA architecture.
2508 ids[0] = 0;
2509 return 1;
2510 }
2511 return bottom;
2512 }
2513
2514 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2515 bool os::numa_topology_changed() {
2516 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2517 if (is_stale != -1 && is_stale) {
2518 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2519 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2520 assert(c != 0, "Failure to initialize LGRP API");
2521 Solaris::set_lgrp_cookie(c);
2522 return true;
2523 }
2524 return false;
2525 }
2526
2527 // Get the group id of the current LWP.
2528 int os::numa_get_group_id() {
2529 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2530 if (lgrp_id == -1) {
2531 return 0;
2532 }
2533 const int size = os::numa_get_groups_num();
2534 int *ids = (int*)alloca(size * sizeof(int));
2535
2536 // Get the ids of all lgroups with memory; r is the count.
2537 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2538 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2539 if (r <= 0) {
2540 return 0;
2541 }
2542 return ids[os::random() % r];
2543 }
2544
2545 // Request information about the page.
2546 bool os::get_page_info(char *start, page_info* info) {
2547 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2548 uint64_t addr = (uintptr_t)start;
2549 uint64_t outdata[2];
2550 uint_t validity = 0;
2551
2552 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2553 return false;
2554 }
2555
2556 info->size = 0;
2557 info->lgrp_id = -1;
2558
2559 if ((validity & 1) != 0) {
2560 if ((validity & 2) != 0) {
2561 info->lgrp_id = outdata[0];
2562 }
2563 if ((validity & 4) != 0) {
2564 info->size = outdata[1];
2565 }
2566 return true;
2567 }
2568 return false;
2569 }
2570
2571 // Scan the pages from start to end until a page different than
2572 // the one described in the info parameter is encountered.
2573 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2574 page_info* page_found) {
2575 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2576 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2577 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2578 uint_t validity[MAX_MEMINFO_CNT];
2579
2580 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2581 uint64_t p = (uint64_t)start;
2582 while (p < (uint64_t)end) {
2583 addrs[0] = p;
2584 size_t addrs_count = 1;
2585 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2586 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2587 addrs_count++;
2588 }
2589
2590 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2591 return NULL;
2592 }
2593
2594 size_t i = 0;
2595 for (; i < addrs_count; i++) {
2596 if ((validity[i] & 1) != 0) {
2597 if ((validity[i] & 4) != 0) {
2598 if (outdata[types * i + 1] != page_expected->size) {
2599 break;
2600 }
2601 } else if (page_expected->size != 0) {
2602 break;
2603 }
2604
2605 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2606 if (outdata[types * i] != page_expected->lgrp_id) {
2607 break;
2608 }
2609 }
2610 } else {
2611 return NULL;
2612 }
2613 }
2614
2615 if (i < addrs_count) {
2616 if ((validity[i] & 2) != 0) {
2617 page_found->lgrp_id = outdata[types * i];
2618 } else {
2619 page_found->lgrp_id = -1;
2620 }
2621 if ((validity[i] & 4) != 0) {
2622 page_found->size = outdata[types * i + 1];
2623 } else {
2624 page_found->size = 0;
2625 }
2626 return (char*)addrs[i];
2627 }
2628
2629 p = addrs[addrs_count - 1] + page_size;
2630 }
2631 return end;
2632 }
2633
2634 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2635 size_t size = bytes;
2636 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2637 // uncommitted page. Otherwise, the read/write might succeed if we
2638 // have enough swap space to back the physical page.
2639 return
2640 NULL != Solaris::mmap_chunk(addr, size,
2641 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2642 PROT_NONE);
2643 }
2644
2645 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2646 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2647
2648 if (b == MAP_FAILED) {
2649 return NULL;
2650 }
2651 return b;
2652 }
2653
2654 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2655 size_t alignment_hint, bool fixed) {
2656 char* addr = requested_addr;
2657 int flags = MAP_PRIVATE | MAP_NORESERVE;
2658
2659 assert(!(fixed && (alignment_hint > 0)),
2660 "alignment hint meaningless with fixed mmap");
2661
2662 if (fixed) {
2663 flags |= MAP_FIXED;
2664 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2665 flags |= MAP_ALIGN;
2666 addr = (char*) alignment_hint;
2667 }
2668
2669 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2670 // uncommitted page. Otherwise, the read/write might succeed if we
2671 // have enough swap space to back the physical page.
2672 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2673 }
2674
2675 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2676 size_t alignment_hint) {
2677 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2678 (requested_addr != NULL));
2679
2680 guarantee(requested_addr == NULL || requested_addr == addr,
2681 "OS failed to return requested mmap address.");
2682 return addr;
2683 }
2684
2685 // Reserve memory at an arbitrary address, only if that area is
2686 // available (and not reserved for something else).
2687
2688 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2689 const int max_tries = 10;
2690 char* base[max_tries];
2691 size_t size[max_tries];
2692
2693 // Solaris adds a gap between mmap'ed regions. The size of the gap
2694 // is dependent on the requested size and the MMU. Our initial gap
2695 // value here is just a guess and will be corrected later.
2696 bool had_top_overlap = false;
2697 bool have_adjusted_gap = false;
2698 size_t gap = 0x400000;
2699
2700 // Assert only that the size is a multiple of the page size, since
2701 // that's all that mmap requires, and since that's all we really know
2702 // about at this low abstraction level. If we need higher alignment,
2703 // we can either pass an alignment to this method or verify alignment
2704 // in one of the methods further up the call chain. See bug 5044738.
2705 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2706
2707 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2708 // Give it a try, if the kernel honors the hint we can return immediately.
2709 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2710
2711 volatile int err = errno;
2712 if (addr == requested_addr) {
2713 return addr;
2714 } else if (addr != NULL) {
2715 pd_unmap_memory(addr, bytes);
2716 }
2717
2718 if (PrintMiscellaneous && Verbose) {
2719 char buf[256];
2720 buf[0] = '\0';
2721 if (addr == NULL) {
2722 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2723 }
2724 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2725 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2726 "%s", bytes, requested_addr, addr, buf);
2727 }
2728
2729 // Address hint method didn't work. Fall back to the old method.
2730 // In theory, once SNV becomes our oldest supported platform, this
2731 // code will no longer be needed.
2732 //
2733 // Repeatedly allocate blocks until the block is allocated at the
2734 // right spot. Give up after max_tries.
2735 int i;
2736 for (i = 0; i < max_tries; ++i) {
2737 base[i] = reserve_memory(bytes);
2738
2739 if (base[i] != NULL) {
2740 // Is this the block we wanted?
2741 if (base[i] == requested_addr) {
2742 size[i] = bytes;
2743 break;
2744 }
2745
2746 // check that the gap value is right
2747 if (had_top_overlap && !have_adjusted_gap) {
2748 size_t actual_gap = base[i-1] - base[i] - bytes;
2749 if (gap != actual_gap) {
2750 // adjust the gap value and retry the last 2 allocations
2751 assert(i > 0, "gap adjustment code problem");
2752 have_adjusted_gap = true; // adjust the gap only once, just in case
2753 gap = actual_gap;
2754 if (PrintMiscellaneous && Verbose) {
2755 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2756 }
2757 unmap_memory(base[i], bytes);
2758 unmap_memory(base[i-1], size[i-1]);
2759 i-=2;
2760 continue;
2761 }
2762 }
2763
2764 // Does this overlap the block we wanted? Give back the overlapped
2765 // parts and try again.
2766 //
2767 // There is still a bug in this code: if top_overlap == bytes,
2768 // the overlap is offset from requested region by the value of gap.
2769 // In this case giving back the overlapped part will not work,
2770 // because we'll give back the entire block at base[i] and
2771 // therefore the subsequent allocation will not generate a new gap.
2772 // This could be fixed with a new algorithm that used larger
2773 // or variable size chunks to find the requested region -
2774 // but such a change would introduce additional complications.
2775 // It's rare enough that the planets align for this bug,
2776 // so we'll just wait for a fix for 6204603/5003415 which
2777 // will provide a mmap flag to allow us to avoid this business.
2778
2779 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2780 if (top_overlap >= 0 && top_overlap < bytes) {
2781 had_top_overlap = true;
2782 unmap_memory(base[i], top_overlap);
2783 base[i] += top_overlap;
2784 size[i] = bytes - top_overlap;
2785 } else {
2786 size_t bottom_overlap = base[i] + bytes - requested_addr;
2787 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2788 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2789 warning("attempt_reserve_memory_at: possible alignment bug");
2790 }
2791 unmap_memory(requested_addr, bottom_overlap);
2792 size[i] = bytes - bottom_overlap;
2793 } else {
2794 size[i] = bytes;
2795 }
2796 }
2797 }
2798 }
2799
2800 // Give back the unused reserved pieces.
2801
2802 for (int j = 0; j < i; ++j) {
2803 if (base[j] != NULL) {
2804 unmap_memory(base[j], size[j]);
2805 }
2806 }
2807
2808 return (i < max_tries) ? requested_addr : NULL;
2809 }
2810
2811 bool os::pd_release_memory(char* addr, size_t bytes) {
2812 size_t size = bytes;
2813 return munmap(addr, size) == 0;
2814 }
2815
2816 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2817 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2818 "addr must be page aligned");
2819 int retVal = mprotect(addr, bytes, prot);
2820 return retVal == 0;
2821 }
2822
2823 // Protect memory (Used to pass readonly pages through
2824 // JNI GetArray<type>Elements with empty arrays.)
2825 // Also, used for serialization page and for compressed oops null pointer
2826 // checking.
2827 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2828 bool is_committed) {
2829 unsigned int p = 0;
2830 switch (prot) {
2831 case MEM_PROT_NONE: p = PROT_NONE; break;
2832 case MEM_PROT_READ: p = PROT_READ; break;
2833 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2834 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2835 default:
2836 ShouldNotReachHere();
2837 }
2838 // is_committed is unused.
2839 return solaris_mprotect(addr, bytes, p);
2840 }
2841
2842 // guard_memory and unguard_memory only happens within stack guard pages.
2843 // Since ISM pertains only to the heap, guard and unguard memory should not
2844 /// happen with an ISM region.
2845 bool os::guard_memory(char* addr, size_t bytes) {
2846 return solaris_mprotect(addr, bytes, PROT_NONE);
2847 }
2848
2849 bool os::unguard_memory(char* addr, size_t bytes) {
2850 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2851 }
2852
2853 // Large page support
2854 static size_t _large_page_size = 0;
2855
2856 // Insertion sort for small arrays (descending order).
2857 static void insertion_sort_descending(size_t* array, int len) {
2858 for (int i = 0; i < len; i++) {
2859 size_t val = array[i];
2860 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2861 size_t tmp = array[key];
2862 array[key] = array[key - 1];
2863 array[key - 1] = tmp;
2864 }
2865 }
2866 }
2867
2868 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2869 const unsigned int usable_count = VM_Version::page_size_count();
2870 if (usable_count == 1) {
2871 return false;
2872 }
2873
2874 // Find the right getpagesizes interface. When solaris 11 is the minimum
2875 // build platform, getpagesizes() (without the '2') can be called directly.
2876 typedef int (*gps_t)(size_t[], int);
2877 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2878 if (gps_func == NULL) {
2879 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2880 if (gps_func == NULL) {
2881 if (warn) {
2882 warning("MPSS is not supported by the operating system.");
2883 }
2884 return false;
2885 }
2886 }
2887
2888 // Fill the array of page sizes.
2889 int n = (*gps_func)(_page_sizes, page_sizes_max);
2890 assert(n > 0, "Solaris bug?");
2891
2892 if (n == page_sizes_max) {
2893 // Add a sentinel value (necessary only if the array was completely filled
2894 // since it is static (zeroed at initialization)).
2895 _page_sizes[--n] = 0;
2896 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2897 }
2898 assert(_page_sizes[n] == 0, "missing sentinel");
2899 trace_page_sizes("available page sizes", _page_sizes, n);
2900
2901 if (n == 1) return false; // Only one page size available.
2902
2903 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2904 // select up to usable_count elements. First sort the array, find the first
2905 // acceptable value, then copy the usable sizes to the top of the array and
2906 // trim the rest. Make sure to include the default page size :-).
2907 //
2908 // A better policy could get rid of the 4M limit by taking the sizes of the
2909 // important VM memory regions (java heap and possibly the code cache) into
2910 // account.
2911 insertion_sort_descending(_page_sizes, n);
2912 const size_t size_limit =
2913 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2914 int beg;
2915 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2916 const int end = MIN2((int)usable_count, n) - 1;
2917 for (int cur = 0; cur < end; ++cur, ++beg) {
2918 _page_sizes[cur] = _page_sizes[beg];
2919 }
2920 _page_sizes[end] = vm_page_size();
2921 _page_sizes[end + 1] = 0;
2922
2923 if (_page_sizes[end] > _page_sizes[end - 1]) {
2924 // Default page size is not the smallest; sort again.
2925 insertion_sort_descending(_page_sizes, end + 1);
2926 }
2927 *page_size = _page_sizes[0];
2928
2929 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2930 return true;
2931 }
2932
2933 void os::large_page_init() {
2934 if (UseLargePages) {
2935 // print a warning if any large page related flag is specified on command line
2936 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2937 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2938
2939 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2940 }
2941 }
2942
2943 bool os::Solaris::is_valid_page_size(size_t bytes) {
2944 for (int i = 0; _page_sizes[i] != 0; i++) {
2945 if (_page_sizes[i] == bytes) {
2946 return true;
2947 }
2948 }
2949 return false;
2950 }
2951
2952 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2953 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2954 assert(is_ptr_aligned((void*) start, align),
2955 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2956 assert(is_size_aligned(bytes, align),
2957 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2958
2959 // Signal to OS that we want large pages for addresses
2960 // from addr, addr + bytes
2961 struct memcntl_mha mpss_struct;
2962 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2963 mpss_struct.mha_pagesize = align;
2964 mpss_struct.mha_flags = 0;
2965 // Upon successful completion, memcntl() returns 0
2966 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2967 debug_only(warning("Attempt to use MPSS failed."));
2968 return false;
2969 }
2970 return true;
2971 }
2972
2973 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2974 fatal("os::reserve_memory_special should not be called on Solaris.");
2975 return NULL;
2976 }
2977
2978 bool os::release_memory_special(char* base, size_t bytes) {
2979 fatal("os::release_memory_special should not be called on Solaris.");
2980 return false;
2981 }
2982
2983 size_t os::large_page_size() {
2984 return _large_page_size;
2985 }
2986
2987 // MPSS allows application to commit large page memory on demand; with ISM
2988 // the entire memory region must be allocated as shared memory.
2989 bool os::can_commit_large_page_memory() {
2990 return true;
2991 }
2992
2993 bool os::can_execute_large_page_memory() {
2994 return true;
2995 }
2996
2997 // Read calls from inside the vm need to perform state transitions
2998 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2999 size_t res;
3000 JavaThread* thread = (JavaThread*)Thread::current();
3001 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3002 ThreadBlockInVM tbiv(thread);
3003 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3004 return res;
3005 }
3006
3007 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
3008 size_t res;
3009 JavaThread* thread = (JavaThread*)Thread::current();
3010 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3011 ThreadBlockInVM tbiv(thread);
3012 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
3013 return res;
3014 }
3015
3016 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3017 size_t res;
3018 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3019 "Assumed _thread_in_native");
3020 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3021 return res;
3022 }
3023
3024 void os::naked_short_sleep(jlong ms) {
3025 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3026
3027 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3028 // Solaris requires -lrt for this.
3029 usleep((ms * 1000));
3030
3031 return;
3032 }
3033
3034 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3035 void os::infinite_sleep() {
3036 while (true) { // sleep forever ...
3037 ::sleep(100); // ... 100 seconds at a time
3038 }
3039 }
3040
3041 // Used to convert frequent JVM_Yield() to nops
3042 bool os::dont_yield() {
3043 if (DontYieldALot) {
3044 static hrtime_t last_time = 0;
3045 hrtime_t diff = getTimeNanos() - last_time;
3046
3047 if (diff < DontYieldALotInterval * 1000000) {
3048 return true;
3049 }
3050
3051 last_time += diff;
3052
3053 return false;
3054 } else {
3055 return false;
3056 }
3057 }
3058
3059 // Note that yield semantics are defined by the scheduling class to which
3060 // the thread currently belongs. Typically, yield will _not yield to
3061 // other equal or higher priority threads that reside on the dispatch queues
3062 // of other CPUs.
3063
3064 void os::naked_yield() {
3065 thr_yield();
3066 }
3067
3068 // Interface for setting lwp priorities. If we are using T2 libthread,
3069 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3070 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3071 // function is meaningless in this mode so we must adjust the real lwp's priority
3072 // The routines below implement the getting and setting of lwp priorities.
3073 //
3074 // Note: T2 is now the only supported libthread. UseBoundThreads flag is
3075 // being deprecated and all threads are now BoundThreads
3076 //
3077 // Note: There are three priority scales used on Solaris. Java priotities
3078 // which range from 1 to 10, libthread "thr_setprio" scale which range
3079 // from 0 to 127, and the current scheduling class of the process we
3080 // are running in. This is typically from -60 to +60.
3081 // The setting of the lwp priorities in done after a call to thr_setprio
3082 // so Java priorities are mapped to libthread priorities and we map from
3083 // the latter to lwp priorities. We don't keep priorities stored in
3084 // Java priorities since some of our worker threads want to set priorities
3085 // higher than all Java threads.
3086 //
3087 // For related information:
3088 // (1) man -s 2 priocntl
3089 // (2) man -s 4 priocntl
3090 // (3) man dispadmin
3091 // = librt.so
3092 // = libthread/common/rtsched.c - thrp_setlwpprio().
3093 // = ps -cL <pid> ... to validate priority.
3094 // = sched_get_priority_min and _max
3095 // pthread_create
3096 // sched_setparam
3097 // pthread_setschedparam
3098 //
3099 // Assumptions:
3100 // + We assume that all threads in the process belong to the same
3101 // scheduling class. IE. an homogenous process.
3102 // + Must be root or in IA group to change change "interactive" attribute.
3103 // Priocntl() will fail silently. The only indication of failure is when
3104 // we read-back the value and notice that it hasn't changed.
3105 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3106 // + For RT, change timeslice as well. Invariant:
3107 // constant "priority integral"
3108 // Konst == TimeSlice * (60-Priority)
3109 // Given a priority, compute appropriate timeslice.
3110 // + Higher numerical values have higher priority.
3111
3112 // sched class attributes
3113 typedef struct {
3114 int schedPolicy; // classID
3115 int maxPrio;
3116 int minPrio;
3117 } SchedInfo;
3118
3119
3120 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3121
3122 #ifdef ASSERT
3123 static int ReadBackValidate = 1;
3124 #endif
3125 static int myClass = 0;
3126 static int myMin = 0;
3127 static int myMax = 0;
3128 static int myCur = 0;
3129 static bool priocntl_enable = false;
3130
3131 static const int criticalPrio = FXCriticalPriority;
3132 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3133
3134
3135 // lwp_priocntl_init
3136 //
3137 // Try to determine the priority scale for our process.
3138 //
3139 // Return errno or 0 if OK.
3140 //
3141 static int lwp_priocntl_init() {
3142 int rslt;
3143 pcinfo_t ClassInfo;
3144 pcparms_t ParmInfo;
3145 int i;
3146
3147 if (!UseThreadPriorities) return 0;
3148
3149 // If ThreadPriorityPolicy is 1, switch tables
3150 if (ThreadPriorityPolicy == 1) {
3151 for (i = 0; i < CriticalPriority+1; i++)
3152 os::java_to_os_priority[i] = prio_policy1[i];
3153 }
3154 if (UseCriticalJavaThreadPriority) {
3155 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3156 // See set_native_priority() and set_lwp_class_and_priority().
3157 // Save original MaxPriority mapping in case attempt to
3158 // use critical priority fails.
3159 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3160 // Set negative to distinguish from other priorities
3161 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3162 }
3163
3164 // Get IDs for a set of well-known scheduling classes.
3165 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3166 // the system. We should have a loop that iterates over the
3167 // classID values, which are known to be "small" integers.
3168
3169 strcpy(ClassInfo.pc_clname, "TS");
3170 ClassInfo.pc_cid = -1;
3171 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3172 if (rslt < 0) return errno;
3173 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3174 tsLimits.schedPolicy = ClassInfo.pc_cid;
3175 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3176 tsLimits.minPrio = -tsLimits.maxPrio;
3177
3178 strcpy(ClassInfo.pc_clname, "IA");
3179 ClassInfo.pc_cid = -1;
3180 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3181 if (rslt < 0) return errno;
3182 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3183 iaLimits.schedPolicy = ClassInfo.pc_cid;
3184 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3185 iaLimits.minPrio = -iaLimits.maxPrio;
3186
3187 strcpy(ClassInfo.pc_clname, "RT");
3188 ClassInfo.pc_cid = -1;
3189 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3190 if (rslt < 0) return errno;
3191 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3192 rtLimits.schedPolicy = ClassInfo.pc_cid;
3193 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3194 rtLimits.minPrio = 0;
3195
3196 strcpy(ClassInfo.pc_clname, "FX");
3197 ClassInfo.pc_cid = -1;
3198 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3199 if (rslt < 0) return errno;
3200 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3201 fxLimits.schedPolicy = ClassInfo.pc_cid;
3202 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3203 fxLimits.minPrio = 0;
3204
3205 // Query our "current" scheduling class.
3206 // This will normally be IA, TS or, rarely, FX or RT.
3207 memset(&ParmInfo, 0, sizeof(ParmInfo));
3208 ParmInfo.pc_cid = PC_CLNULL;
3209 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3210 if (rslt < 0) return errno;
3211 myClass = ParmInfo.pc_cid;
3212
3213 // We now know our scheduling classId, get specific information
3214 // about the class.
3215 ClassInfo.pc_cid = myClass;
3216 ClassInfo.pc_clname[0] = 0;
3217 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3218 if (rslt < 0) return errno;
3219
3220 if (ThreadPriorityVerbose) {
3221 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3222 }
3223
3224 memset(&ParmInfo, 0, sizeof(pcparms_t));
3225 ParmInfo.pc_cid = PC_CLNULL;
3226 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3227 if (rslt < 0) return errno;
3228
3229 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3230 myMin = rtLimits.minPrio;
3231 myMax = rtLimits.maxPrio;
3232 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3233 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3234 myMin = iaLimits.minPrio;
3235 myMax = iaLimits.maxPrio;
3236 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3237 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3238 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3239 myMin = tsLimits.minPrio;
3240 myMax = tsLimits.maxPrio;
3241 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3242 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3243 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3244 myMin = fxLimits.minPrio;
3245 myMax = fxLimits.maxPrio;
3246 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3247 } else {
3248 // No clue - punt
3249 if (ThreadPriorityVerbose) {
3250 tty->print_cr("Unknown scheduling class: %s ... \n",
3251 ClassInfo.pc_clname);
3252 }
3253 return EINVAL; // no clue, punt
3254 }
3255
3256 if (ThreadPriorityVerbose) {
3257 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3258 }
3259
3260 priocntl_enable = true; // Enable changing priorities
3261 return 0;
3262 }
3263
3264 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3265 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3266 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3267 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3268
3269
3270 // scale_to_lwp_priority
3271 //
3272 // Convert from the libthread "thr_setprio" scale to our current
3273 // lwp scheduling class scale.
3274 //
3275 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3276 int v;
3277
3278 if (x == 127) return rMax; // avoid round-down
3279 v = (((x*(rMax-rMin)))/128)+rMin;
3280 return v;
3281 }
3282
3283
3284 // set_lwp_class_and_priority
3285 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3286 int newPrio, int new_class, bool scale) {
3287 int rslt;
3288 int Actual, Expected, prv;
3289 pcparms_t ParmInfo; // for GET-SET
3290 #ifdef ASSERT
3291 pcparms_t ReadBack; // for readback
3292 #endif
3293
3294 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3295 // Query current values.
3296 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3297 // Cache "pcparms_t" in global ParmCache.
3298 // TODO: elide set-to-same-value
3299
3300 // If something went wrong on init, don't change priorities.
3301 if (!priocntl_enable) {
3302 if (ThreadPriorityVerbose) {
3303 tty->print_cr("Trying to set priority but init failed, ignoring");
3304 }
3305 return EINVAL;
3306 }
3307
3308 // If lwp hasn't started yet, just return
3309 // the _start routine will call us again.
3310 if (lwpid <= 0) {
3311 if (ThreadPriorityVerbose) {
3312 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3313 INTPTR_FORMAT " to %d, lwpid not set",
3314 ThreadID, newPrio);
3315 }
3316 return 0;
3317 }
3318
3319 if (ThreadPriorityVerbose) {
3320 tty->print_cr ("set_lwp_class_and_priority("
3321 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3322 ThreadID, lwpid, newPrio);
3323 }
3324
3325 memset(&ParmInfo, 0, sizeof(pcparms_t));
3326 ParmInfo.pc_cid = PC_CLNULL;
3327 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3328 if (rslt < 0) return errno;
3329
3330 int cur_class = ParmInfo.pc_cid;
3331 ParmInfo.pc_cid = (id_t)new_class;
3332
3333 if (new_class == rtLimits.schedPolicy) {
3334 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3335 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3336 rtLimits.maxPrio, newPrio)
3337 : newPrio;
3338 rtInfo->rt_tqsecs = RT_NOCHANGE;
3339 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3340 if (ThreadPriorityVerbose) {
3341 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3342 }
3343 } else if (new_class == iaLimits.schedPolicy) {
3344 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3345 int maxClamped = MIN2(iaLimits.maxPrio,
3346 cur_class == new_class
3347 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3348 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3349 maxClamped, newPrio)
3350 : newPrio;
3351 iaInfo->ia_uprilim = cur_class == new_class
3352 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3353 iaInfo->ia_mode = IA_NOCHANGE;
3354 if (ThreadPriorityVerbose) {
3355 tty->print_cr("IA: [%d...%d] %d->%d\n",
3356 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3357 }
3358 } else if (new_class == tsLimits.schedPolicy) {
3359 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3360 int maxClamped = MIN2(tsLimits.maxPrio,
3361 cur_class == new_class
3362 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3363 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3364 maxClamped, newPrio)
3365 : newPrio;
3366 tsInfo->ts_uprilim = cur_class == new_class
3367 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3368 if (ThreadPriorityVerbose) {
3369 tty->print_cr("TS: [%d...%d] %d->%d\n",
3370 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3371 }
3372 } else if (new_class == fxLimits.schedPolicy) {
3373 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3374 int maxClamped = MIN2(fxLimits.maxPrio,
3375 cur_class == new_class
3376 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3377 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3378 maxClamped, newPrio)
3379 : newPrio;
3380 fxInfo->fx_uprilim = cur_class == new_class
3381 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3382 fxInfo->fx_tqsecs = FX_NOCHANGE;
3383 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3384 if (ThreadPriorityVerbose) {
3385 tty->print_cr("FX: [%d...%d] %d->%d\n",
3386 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3387 }
3388 } else {
3389 if (ThreadPriorityVerbose) {
3390 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3391 }
3392 return EINVAL; // no clue, punt
3393 }
3394
3395 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3396 if (ThreadPriorityVerbose && rslt) {
3397 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3398 }
3399 if (rslt < 0) return errno;
3400
3401 #ifdef ASSERT
3402 // Sanity check: read back what we just attempted to set.
3403 // In theory it could have changed in the interim ...
3404 //
3405 // The priocntl system call is tricky.
3406 // Sometimes it'll validate the priority value argument and
3407 // return EINVAL if unhappy. At other times it fails silently.
3408 // Readbacks are prudent.
3409
3410 if (!ReadBackValidate) return 0;
3411
3412 memset(&ReadBack, 0, sizeof(pcparms_t));
3413 ReadBack.pc_cid = PC_CLNULL;
3414 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3415 assert(rslt >= 0, "priocntl failed");
3416 Actual = Expected = 0xBAD;
3417 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3418 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3419 Actual = RTPRI(ReadBack)->rt_pri;
3420 Expected = RTPRI(ParmInfo)->rt_pri;
3421 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3422 Actual = IAPRI(ReadBack)->ia_upri;
3423 Expected = IAPRI(ParmInfo)->ia_upri;
3424 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3425 Actual = TSPRI(ReadBack)->ts_upri;
3426 Expected = TSPRI(ParmInfo)->ts_upri;
3427 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3428 Actual = FXPRI(ReadBack)->fx_upri;
3429 Expected = FXPRI(ParmInfo)->fx_upri;
3430 } else {
3431 if (ThreadPriorityVerbose) {
3432 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3433 ParmInfo.pc_cid);
3434 }
3435 }
3436
3437 if (Actual != Expected) {
3438 if (ThreadPriorityVerbose) {
3439 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3440 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3441 }
3442 }
3443 #endif
3444
3445 return 0;
3446 }
3447
3448 // Solaris only gives access to 128 real priorities at a time,
3449 // so we expand Java's ten to fill this range. This would be better
3450 // if we dynamically adjusted relative priorities.
3451 //
3452 // The ThreadPriorityPolicy option allows us to select 2 different
3453 // priority scales.
3454 //
3455 // ThreadPriorityPolicy=0
3456 // Since the Solaris' default priority is MaximumPriority, we do not
3457 // set a priority lower than Max unless a priority lower than
3458 // NormPriority is requested.
3459 //
3460 // ThreadPriorityPolicy=1
3461 // This mode causes the priority table to get filled with
3462 // linear values. NormPriority get's mapped to 50% of the
3463 // Maximum priority an so on. This will cause VM threads
3464 // to get unfair treatment against other Solaris processes
3465 // which do not explicitly alter their thread priorities.
3466
3467 int os::java_to_os_priority[CriticalPriority + 1] = {
3468 -99999, // 0 Entry should never be used
3469
3470 0, // 1 MinPriority
3471 32, // 2
3472 64, // 3
3473
3474 96, // 4
3475 127, // 5 NormPriority
3476 127, // 6
3477
3478 127, // 7
3479 127, // 8
3480 127, // 9 NearMaxPriority
3481
3482 127, // 10 MaxPriority
3483
3484 -criticalPrio // 11 CriticalPriority
3485 };
3486
3487 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3488 OSThread* osthread = thread->osthread();
3489
3490 // Save requested priority in case the thread hasn't been started
3491 osthread->set_native_priority(newpri);
3492
3493 // Check for critical priority request
3494 bool fxcritical = false;
3495 if (newpri == -criticalPrio) {
3496 fxcritical = true;
3497 newpri = criticalPrio;
3498 }
3499
3500 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3501 if (!UseThreadPriorities) return OS_OK;
3502
3503 int status = 0;
3504
3505 if (!fxcritical) {
3506 // Use thr_setprio only if we have a priority that thr_setprio understands
3507 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3508 }
3509
3510 int lwp_status =
3511 set_lwp_class_and_priority(osthread->thread_id(),
3512 osthread->lwp_id(),
3513 newpri,
3514 fxcritical ? fxLimits.schedPolicy : myClass,
3515 !fxcritical);
3516 if (lwp_status != 0 && fxcritical) {
3517 // Try again, this time without changing the scheduling class
3518 newpri = java_MaxPriority_to_os_priority;
3519 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3520 osthread->lwp_id(),
3521 newpri, myClass, false);
3522 }
3523 status |= lwp_status;
3524 return (status == 0) ? OS_OK : OS_ERR;
3525 }
3526
3527
3528 OSReturn os::get_native_priority(const Thread* const thread,
3529 int *priority_ptr) {
3530 int p;
3531 if (!UseThreadPriorities) {
3532 *priority_ptr = NormalPriority;
3533 return OS_OK;
3534 }
3535 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3536 if (status != 0) {
3537 return OS_ERR;
3538 }
3539 *priority_ptr = p;
3540 return OS_OK;
3541 }
3542
3543
3544 // Hint to the underlying OS that a task switch would not be good.
3545 // Void return because it's a hint and can fail.
3546 void os::hint_no_preempt() {
3547 schedctl_start(schedctl_init());
3548 }
3549
3550 static void resume_clear_context(OSThread *osthread) {
3551 osthread->set_ucontext(NULL);
3552 }
3553
3554 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3555 osthread->set_ucontext(context);
3556 }
3557
3558 static PosixSemaphore sr_semaphore;
3559
3560 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3561 // Save and restore errno to avoid confusing native code with EINTR
3562 // after sigsuspend.
3563 int old_errno = errno;
3564
3565 OSThread* osthread = thread->osthread();
3566 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3567
3568 os::SuspendResume::State current = osthread->sr.state();
3569 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3570 suspend_save_context(osthread, uc);
3571
3572 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3573 os::SuspendResume::State state = osthread->sr.suspended();
3574 if (state == os::SuspendResume::SR_SUSPENDED) {
3575 sigset_t suspend_set; // signals for sigsuspend()
3576
3577 // get current set of blocked signals and unblock resume signal
3578 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3579 sigdelset(&suspend_set, os::Solaris::SIGasync());
3580
3581 sr_semaphore.signal();
3582 // wait here until we are resumed
3583 while (1) {
3584 sigsuspend(&suspend_set);
3585
3586 os::SuspendResume::State result = osthread->sr.running();
3587 if (result == os::SuspendResume::SR_RUNNING) {
3588 sr_semaphore.signal();
3589 break;
3590 }
3591 }
3592
3593 } else if (state == os::SuspendResume::SR_RUNNING) {
3594 // request was cancelled, continue
3595 } else {
3596 ShouldNotReachHere();
3597 }
3598
3599 resume_clear_context(osthread);
3600 } else if (current == os::SuspendResume::SR_RUNNING) {
3601 // request was cancelled, continue
3602 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3603 // ignore
3604 } else {
3605 // ignore
3606 }
3607
3608 errno = old_errno;
3609 }
3610
3611 void os::print_statistics() {
3612 }
3613
3614 int os::message_box(const char* title, const char* message) {
3615 int i;
3616 fdStream err(defaultStream::error_fd());
3617 for (i = 0; i < 78; i++) err.print_raw("=");
3618 err.cr();
3619 err.print_raw_cr(title);
3620 for (i = 0; i < 78; i++) err.print_raw("-");
3621 err.cr();
3622 err.print_raw_cr(message);
3623 for (i = 0; i < 78; i++) err.print_raw("=");
3624 err.cr();
3625
3626 char buf[16];
3627 // Prevent process from exiting upon "read error" without consuming all CPU
3628 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3629
3630 return buf[0] == 'y' || buf[0] == 'Y';
3631 }
3632
3633 static int sr_notify(OSThread* osthread) {
3634 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3635 assert_status(status == 0, status, "thr_kill");
3636 return status;
3637 }
3638
3639 // "Randomly" selected value for how long we want to spin
3640 // before bailing out on suspending a thread, also how often
3641 // we send a signal to a thread we want to resume
3642 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3643 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3644
3645 static bool do_suspend(OSThread* osthread) {
3646 assert(osthread->sr.is_running(), "thread should be running");
3647 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3648
3649 // mark as suspended and send signal
3650 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3651 // failed to switch, state wasn't running?
3652 ShouldNotReachHere();
3653 return false;
3654 }
3655
3656 if (sr_notify(osthread) != 0) {
3657 ShouldNotReachHere();
3658 }
3659
3660 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3661 while (true) {
3662 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3663 break;
3664 } else {
3665 // timeout
3666 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3667 if (cancelled == os::SuspendResume::SR_RUNNING) {
3668 return false;
3669 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3670 // make sure that we consume the signal on the semaphore as well
3671 sr_semaphore.wait();
3672 break;
3673 } else {
3674 ShouldNotReachHere();
3675 return false;
3676 }
3677 }
3678 }
3679
3680 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3681 return true;
3682 }
3683
3684 static void do_resume(OSThread* osthread) {
3685 assert(osthread->sr.is_suspended(), "thread should be suspended");
3686 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3687
3688 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3689 // failed to switch to WAKEUP_REQUEST
3690 ShouldNotReachHere();
3691 return;
3692 }
3693
3694 while (true) {
3695 if (sr_notify(osthread) == 0) {
3696 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3697 if (osthread->sr.is_running()) {
3698 return;
3699 }
3700 }
3701 } else {
3702 ShouldNotReachHere();
3703 }
3704 }
3705
3706 guarantee(osthread->sr.is_running(), "Must be running!");
3707 }
3708
3709 void os::SuspendedThreadTask::internal_do_task() {
3710 if (do_suspend(_thread->osthread())) {
3711 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3712 do_task(context);
3713 do_resume(_thread->osthread());
3714 }
3715 }
3716
3717 class PcFetcher : public os::SuspendedThreadTask {
3718 public:
3719 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3720 ExtendedPC result();
3721 protected:
3722 void do_task(const os::SuspendedThreadTaskContext& context);
3723 private:
3724 ExtendedPC _epc;
3725 };
3726
3727 ExtendedPC PcFetcher::result() {
3728 guarantee(is_done(), "task is not done yet.");
3729 return _epc;
3730 }
3731
3732 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3733 Thread* thread = context.thread();
3734 OSThread* osthread = thread->osthread();
3735 if (osthread->ucontext() != NULL) {
3736 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
3737 } else {
3738 // NULL context is unexpected, double-check this is the VMThread
3739 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3740 }
3741 }
3742
3743 // A lightweight implementation that does not suspend the target thread and
3744 // thus returns only a hint. Used for profiling only!
3745 ExtendedPC os::get_thread_pc(Thread* thread) {
3746 // Make sure that it is called by the watcher and the Threads lock is owned.
3747 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3748 // For now, is only used to profile the VM Thread
3749 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3750 PcFetcher fetcher(thread);
3751 fetcher.run();
3752 return fetcher.result();
3753 }
3754
3755
3756 // This does not do anything on Solaris. This is basically a hook for being
3757 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3758 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3759 const methodHandle& method, JavaCallArguments* args,
3760 Thread* thread) {
3761 f(value, method, args, thread);
3762 }
3763
3764 // This routine may be used by user applications as a "hook" to catch signals.
3765 // The user-defined signal handler must pass unrecognized signals to this
3766 // routine, and if it returns true (non-zero), then the signal handler must
3767 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3768 // routine will never retun false (zero), but instead will execute a VM panic
3769 // routine kill the process.
3770 //
3771 // If this routine returns false, it is OK to call it again. This allows
3772 // the user-defined signal handler to perform checks either before or after
3773 // the VM performs its own checks. Naturally, the user code would be making
3774 // a serious error if it tried to handle an exception (such as a null check
3775 // or breakpoint) that the VM was generating for its own correct operation.
3776 //
3777 // This routine may recognize any of the following kinds of signals:
3778 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3779 // os::Solaris::SIGasync
3780 // It should be consulted by handlers for any of those signals.
3781 //
3782 // The caller of this routine must pass in the three arguments supplied
3783 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3784 // field of the structure passed to sigaction(). This routine assumes that
3785 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3786 //
3787 // Note that the VM will print warnings if it detects conflicting signal
3788 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3789 //
3790 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3791 siginfo_t* siginfo,
3792 void* ucontext,
3793 int abort_if_unrecognized);
3794
3795
3796 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3797 int orig_errno = errno; // Preserve errno value over signal handler.
3798 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3799 errno = orig_errno;
3800 }
3801
3802 // This boolean allows users to forward their own non-matching signals
3803 // to JVM_handle_solaris_signal, harmlessly.
3804 bool os::Solaris::signal_handlers_are_installed = false;
3805
3806 // For signal-chaining
3807 bool os::Solaris::libjsig_is_loaded = false;
3808 typedef struct sigaction *(*get_signal_t)(int);
3809 get_signal_t os::Solaris::get_signal_action = NULL;
3810
3811 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3812 struct sigaction *actp = NULL;
3813
3814 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3815 // Retrieve the old signal handler from libjsig
3816 actp = (*get_signal_action)(sig);
3817 }
3818 if (actp == NULL) {
3819 // Retrieve the preinstalled signal handler from jvm
3820 actp = get_preinstalled_handler(sig);
3821 }
3822
3823 return actp;
3824 }
3825
3826 static bool call_chained_handler(struct sigaction *actp, int sig,
3827 siginfo_t *siginfo, void *context) {
3828 // Call the old signal handler
3829 if (actp->sa_handler == SIG_DFL) {
3830 // It's more reasonable to let jvm treat it as an unexpected exception
3831 // instead of taking the default action.
3832 return false;
3833 } else if (actp->sa_handler != SIG_IGN) {
3834 if ((actp->sa_flags & SA_NODEFER) == 0) {
3835 // automaticlly block the signal
3836 sigaddset(&(actp->sa_mask), sig);
3837 }
3838
3839 sa_handler_t hand;
3840 sa_sigaction_t sa;
3841 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3842 // retrieve the chained handler
3843 if (siginfo_flag_set) {
3844 sa = actp->sa_sigaction;
3845 } else {
3846 hand = actp->sa_handler;
3847 }
3848
3849 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3850 actp->sa_handler = SIG_DFL;
3851 }
3852
3853 // try to honor the signal mask
3854 sigset_t oset;
3855 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3856
3857 // call into the chained handler
3858 if (siginfo_flag_set) {
3859 (*sa)(sig, siginfo, context);
3860 } else {
3861 (*hand)(sig);
3862 }
3863
3864 // restore the signal mask
3865 thr_sigsetmask(SIG_SETMASK, &oset, 0);
3866 }
3867 // Tell jvm's signal handler the signal is taken care of.
3868 return true;
3869 }
3870
3871 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3872 bool chained = false;
3873 // signal-chaining
3874 if (UseSignalChaining) {
3875 struct sigaction *actp = get_chained_signal_action(sig);
3876 if (actp != NULL) {
3877 chained = call_chained_handler(actp, sig, siginfo, context);
3878 }
3879 }
3880 return chained;
3881 }
3882
3883 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3884 assert((chainedsigactions != (struct sigaction *)NULL) &&
3885 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3886 if (preinstalled_sigs[sig] != 0) {
3887 return &chainedsigactions[sig];
3888 }
3889 return NULL;
3890 }
3891
3892 void os::Solaris::save_preinstalled_handler(int sig,
3893 struct sigaction& oldAct) {
3894 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3895 assert((chainedsigactions != (struct sigaction *)NULL) &&
3896 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3897 chainedsigactions[sig] = oldAct;
3898 preinstalled_sigs[sig] = 1;
3899 }
3900
3901 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3902 bool oktochain) {
3903 // Check for overwrite.
3904 struct sigaction oldAct;
3905 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3906 void* oldhand =
3907 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3908 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3909 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3910 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3911 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3912 if (AllowUserSignalHandlers || !set_installed) {
3913 // Do not overwrite; user takes responsibility to forward to us.
3914 return;
3915 } else if (UseSignalChaining) {
3916 if (oktochain) {
3917 // save the old handler in jvm
3918 save_preinstalled_handler(sig, oldAct);
3919 } else {
3920 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3921 }
3922 // libjsig also interposes the sigaction() call below and saves the
3923 // old sigaction on it own.
3924 } else {
3925 fatal("Encountered unexpected pre-existing sigaction handler "
3926 "%#lx for signal %d.", (long)oldhand, sig);
3927 }
3928 }
3929
3930 struct sigaction sigAct;
3931 sigfillset(&(sigAct.sa_mask));
3932 sigAct.sa_handler = SIG_DFL;
3933
3934 sigAct.sa_sigaction = signalHandler;
3935 // Handle SIGSEGV on alternate signal stack if
3936 // not using stack banging
3937 if (!UseStackBanging && sig == SIGSEGV) {
3938 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3939 } else {
3940 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3941 }
3942 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3943
3944 sigaction(sig, &sigAct, &oldAct);
3945
3946 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3947 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3948 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3949 }
3950
3951
3952 #define DO_SIGNAL_CHECK(sig) \
3953 do { \
3954 if (!sigismember(&check_signal_done, sig)) { \
3955 os::Solaris::check_signal_handler(sig); \
3956 } \
3957 } while (0)
3958
3959 // This method is a periodic task to check for misbehaving JNI applications
3960 // under CheckJNI, we can add any periodic checks here
3961
3962 void os::run_periodic_checks() {
3963 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3964 // thereby preventing a NULL checks.
3965 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3966
3967 if (check_signals == false) return;
3968
3969 // SEGV and BUS if overridden could potentially prevent
3970 // generation of hs*.log in the event of a crash, debugging
3971 // such a case can be very challenging, so we absolutely
3972 // check for the following for a good measure:
3973 DO_SIGNAL_CHECK(SIGSEGV);
3974 DO_SIGNAL_CHECK(SIGILL);
3975 DO_SIGNAL_CHECK(SIGFPE);
3976 DO_SIGNAL_CHECK(SIGBUS);
3977 DO_SIGNAL_CHECK(SIGPIPE);
3978 DO_SIGNAL_CHECK(SIGXFSZ);
3979
3980 // ReduceSignalUsage allows the user to override these handlers
3981 // see comments at the very top and jvm_solaris.h
3982 if (!ReduceSignalUsage) {
3983 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3984 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3985 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3986 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3987 }
3988
3989 // See comments above for using JVM1/JVM2
3990 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
3991
3992 }
3993
3994 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3995
3996 static os_sigaction_t os_sigaction = NULL;
3997
3998 void os::Solaris::check_signal_handler(int sig) {
3999 char buf[O_BUFLEN];
4000 address jvmHandler = NULL;
4001
4002 struct sigaction act;
4003 if (os_sigaction == NULL) {
4004 // only trust the default sigaction, in case it has been interposed
4005 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4006 if (os_sigaction == NULL) return;
4007 }
4008
4009 os_sigaction(sig, (struct sigaction*)NULL, &act);
4010
4011 address thisHandler = (act.sa_flags & SA_SIGINFO)
4012 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4013 : CAST_FROM_FN_PTR(address, act.sa_handler);
4014
4015
4016 switch (sig) {
4017 case SIGSEGV:
4018 case SIGBUS:
4019 case SIGFPE:
4020 case SIGPIPE:
4021 case SIGXFSZ:
4022 case SIGILL:
4023 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4024 break;
4025
4026 case SHUTDOWN1_SIGNAL:
4027 case SHUTDOWN2_SIGNAL:
4028 case SHUTDOWN3_SIGNAL:
4029 case BREAK_SIGNAL:
4030 jvmHandler = (address)user_handler();
4031 break;
4032
4033 default:
4034 int asynsig = os::Solaris::SIGasync();
4035
4036 if (sig == asynsig) {
4037 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4038 } else {
4039 return;
4040 }
4041 break;
4042 }
4043
4044
4045 if (thisHandler != jvmHandler) {
4046 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4047 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4048 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4049 // No need to check this sig any longer
4050 sigaddset(&check_signal_done, sig);
4051 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4052 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4053 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4054 exception_name(sig, buf, O_BUFLEN));
4055 }
4056 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4057 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4058 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4059 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4060 // No need to check this sig any longer
4061 sigaddset(&check_signal_done, sig);
4062 }
4063
4064 // Print all the signal handler state
4065 if (sigismember(&check_signal_done, sig)) {
4066 print_signal_handlers(tty, buf, O_BUFLEN);
4067 }
4068
4069 }
4070
4071 void os::Solaris::install_signal_handlers() {
4072 bool libjsigdone = false;
4073 signal_handlers_are_installed = true;
4074
4075 // signal-chaining
4076 typedef void (*signal_setting_t)();
4077 signal_setting_t begin_signal_setting = NULL;
4078 signal_setting_t end_signal_setting = NULL;
4079 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4080 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4081 if (begin_signal_setting != NULL) {
4082 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4083 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4084 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4085 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4086 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4087 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4088 libjsig_is_loaded = true;
4089 if (os::Solaris::get_libjsig_version != NULL) {
4090 libjsigversion = (*os::Solaris::get_libjsig_version)();
4091 }
4092 assert(UseSignalChaining, "should enable signal-chaining");
4093 }
4094 if (libjsig_is_loaded) {
4095 // Tell libjsig jvm is setting signal handlers
4096 (*begin_signal_setting)();
4097 }
4098
4099 set_signal_handler(SIGSEGV, true, true);
4100 set_signal_handler(SIGPIPE, true, true);
4101 set_signal_handler(SIGXFSZ, true, true);
4102 set_signal_handler(SIGBUS, true, true);
4103 set_signal_handler(SIGILL, true, true);
4104 set_signal_handler(SIGFPE, true, true);
4105
4106
4107 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4108 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4109 // can not register overridable signals which might be > 32
4110 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4111 // Tell libjsig jvm has finished setting signal handlers
4112 (*end_signal_setting)();
4113 libjsigdone = true;
4114 }
4115 }
4116
4117 set_signal_handler(os::Solaris::SIGasync(), true, true);
4118
4119 if (libjsig_is_loaded && !libjsigdone) {
4120 // Tell libjsig jvm finishes setting signal handlers
4121 (*end_signal_setting)();
4122 }
4123
4124 // We don't activate signal checker if libjsig is in place, we trust ourselves
4125 // and if UserSignalHandler is installed all bets are off.
4126 // Log that signal checking is off only if -verbose:jni is specified.
4127 if (CheckJNICalls) {
4128 if (libjsig_is_loaded) {
4129 if (PrintJNIResolving) {
4130 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4131 }
4132 check_signals = false;
4133 }
4134 if (AllowUserSignalHandlers) {
4135 if (PrintJNIResolving) {
4136 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4137 }
4138 check_signals = false;
4139 }
4140 }
4141 }
4142
4143
4144 void report_error(const char* file_name, int line_no, const char* title,
4145 const char* format, ...);
4146
4147 const char * signames[] = {
4148 "SIG0",
4149 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4150 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4151 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4152 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4153 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4154 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4155 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4156 "SIGCANCEL", "SIGLOST"
4157 };
4158
4159 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4160 if (0 < exception_code && exception_code <= SIGRTMAX) {
4161 // signal
4162 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4163 jio_snprintf(buf, size, "%s", signames[exception_code]);
4164 } else {
4165 jio_snprintf(buf, size, "SIG%d", exception_code);
4166 }
4167 return buf;
4168 } else {
4169 return NULL;
4170 }
4171 }
4172
4173 // (Static) wrapper for getisax(2) call.
4174 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4175
4176 // (Static) wrappers for the liblgrp API
4177 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4178 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4179 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4180 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4181 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4182 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4183 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4184 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4185 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4186
4187 // (Static) wrapper for meminfo() call.
4188 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4189
4190 static address resolve_symbol_lazy(const char* name) {
4191 address addr = (address) dlsym(RTLD_DEFAULT, name);
4192 if (addr == NULL) {
4193 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4194 addr = (address) dlsym(RTLD_NEXT, name);
4195 }
4196 return addr;
4197 }
4198
4199 static address resolve_symbol(const char* name) {
4200 address addr = resolve_symbol_lazy(name);
4201 if (addr == NULL) {
4202 fatal(dlerror());
4203 }
4204 return addr;
4205 }
4206
4207 void os::Solaris::libthread_init() {
4208 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4209
4210 lwp_priocntl_init();
4211
4212 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4213 if (func == NULL) {
4214 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4215 // Guarantee that this VM is running on an new enough OS (5.6 or
4216 // later) that it will have a new enough libthread.so.
4217 guarantee(func != NULL, "libthread.so is too old.");
4218 }
4219
4220 int size;
4221 void (*handler_info_func)(address *, int *);
4222 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4223 handler_info_func(&handler_start, &size);
4224 handler_end = handler_start + size;
4225 }
4226
4227
4228 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4229 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4230 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4231 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4232 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4233 int os::Solaris::_mutex_scope = USYNC_THREAD;
4234
4235 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4236 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4237 int_fnP_cond_tP os::Solaris::_cond_signal;
4238 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4239 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4240 int_fnP_cond_tP os::Solaris::_cond_destroy;
4241 int os::Solaris::_cond_scope = USYNC_THREAD;
4242
4243 void os::Solaris::synchronization_init() {
4244 if (UseLWPSynchronization) {
4245 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4246 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4247 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4248 os::Solaris::set_mutex_init(lwp_mutex_init);
4249 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4250 os::Solaris::set_mutex_scope(USYNC_THREAD);
4251
4252 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4253 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4254 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4255 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4256 os::Solaris::set_cond_init(lwp_cond_init);
4257 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4258 os::Solaris::set_cond_scope(USYNC_THREAD);
4259 } else {
4260 os::Solaris::set_mutex_scope(USYNC_THREAD);
4261 os::Solaris::set_cond_scope(USYNC_THREAD);
4262
4263 if (UsePthreads) {
4264 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4265 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4266 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4267 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4268 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4269
4270 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4271 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4272 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4273 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4274 os::Solaris::set_cond_init(pthread_cond_default_init);
4275 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4276 } else {
4277 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4278 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4279 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4280 os::Solaris::set_mutex_init(::mutex_init);
4281 os::Solaris::set_mutex_destroy(::mutex_destroy);
4282
4283 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4284 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4285 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4286 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4287 os::Solaris::set_cond_init(::cond_init);
4288 os::Solaris::set_cond_destroy(::cond_destroy);
4289 }
4290 }
4291 }
4292
4293 bool os::Solaris::liblgrp_init() {
4294 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4295 if (handle != NULL) {
4296 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4297 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4298 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4299 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4300 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4301 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4302 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4303 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4304 dlsym(handle, "lgrp_cookie_stale")));
4305
4306 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4307 set_lgrp_cookie(c);
4308 return true;
4309 }
4310 return false;
4311 }
4312
4313 void os::Solaris::misc_sym_init() {
4314 address func;
4315
4316 // getisax
4317 func = resolve_symbol_lazy("getisax");
4318 if (func != NULL) {
4319 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4320 }
4321
4322 // meminfo
4323 func = resolve_symbol_lazy("meminfo");
4324 if (func != NULL) {
4325 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4326 }
4327 }
4328
4329 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4330 assert(_getisax != NULL, "_getisax not set");
4331 return _getisax(array, n);
4332 }
4333
4334 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4335 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4336 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4337
4338 void init_pset_getloadavg_ptr(void) {
4339 pset_getloadavg_ptr =
4340 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4341 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4342 warning("pset_getloadavg function not found");
4343 }
4344 }
4345
4346 int os::Solaris::_dev_zero_fd = -1;
4347
4348 // this is called _before_ the global arguments have been parsed
4349 void os::init(void) {
4350 _initial_pid = getpid();
4351
4352 max_hrtime = first_hrtime = gethrtime();
4353
4354 init_random(1234567);
4355
4356 page_size = sysconf(_SC_PAGESIZE);
4357 if (page_size == -1) {
4358 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno));
4359 }
4360 init_page_sizes((size_t) page_size);
4361
4362 Solaris::initialize_system_info();
4363
4364 // Initialize misc. symbols as soon as possible, so we can use them
4365 // if we need them.
4366 Solaris::misc_sym_init();
4367
4368 int fd = ::open("/dev/zero", O_RDWR);
4369 if (fd < 0) {
4370 fatal("os::init: cannot open /dev/zero (%s)", strerror(errno));
4371 } else {
4372 Solaris::set_dev_zero_fd(fd);
4373
4374 // Close on exec, child won't inherit.
4375 fcntl(fd, F_SETFD, FD_CLOEXEC);
4376 }
4377
4378 clock_tics_per_sec = CLK_TCK;
4379
4380 // check if dladdr1() exists; dladdr1 can provide more information than
4381 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4382 // and is available on linker patches for 5.7 and 5.8.
4383 // libdl.so must have been loaded, this call is just an entry lookup
4384 void * hdl = dlopen("libdl.so", RTLD_NOW);
4385 if (hdl) {
4386 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4387 }
4388
4389 // (Solaris only) this switches to calls that actually do locking.
4390 ThreadCritical::initialize();
4391
4392 main_thread = thr_self();
4393
4394 // Constant minimum stack size allowed. It must be at least
4395 // the minimum of what the OS supports (thr_min_stack()), and
4396 // enough to allow the thread to get to user bytecode execution.
4397 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4398 // If the pagesize of the VM is greater than 8K determine the appropriate
4399 // number of initial guard pages. The user can change this with the
4400 // command line arguments, if needed.
4401 if (vm_page_size() > 8*K) {
4402 StackYellowPages = 1;
4403 StackRedPages = 1;
4404 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4405 }
4406 }
4407
4408 // To install functions for atexit system call
4409 extern "C" {
4410 static void perfMemory_exit_helper() {
4411 perfMemory_exit();
4412 }
4413 }
4414
4415 // this is called _after_ the global arguments have been parsed
4416 jint os::init_2(void) {
4417 // try to enable extended file IO ASAP, see 6431278
4418 os::Solaris::try_enable_extended_io();
4419
4420 // Allocate a single page and mark it as readable for safepoint polling. Also
4421 // use this first mmap call to check support for MAP_ALIGN.
4422 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4423 page_size,
4424 MAP_PRIVATE | MAP_ALIGN,
4425 PROT_READ);
4426 if (polling_page == NULL) {
4427 has_map_align = false;
4428 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4429 PROT_READ);
4430 }
4431
4432 os::set_polling_page(polling_page);
4433
4434 #ifndef PRODUCT
4435 if (Verbose && PrintMiscellaneous) {
4436 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4437 (intptr_t)polling_page);
4438 }
4439 #endif
4440
4441 if (!UseMembar) {
4442 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4443 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4444 os::set_memory_serialize_page(mem_serialize_page);
4445
4446 #ifndef PRODUCT
4447 if (Verbose && PrintMiscellaneous) {
4448 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4449 (intptr_t)mem_serialize_page);
4450 }
4451 #endif
4452 }
4453
4454 // Check minimum allowable stack size for thread creation and to initialize
4455 // the java system classes, including StackOverflowError - depends on page
4456 // size. Add a page for compiler2 recursion in main thread.
4457 // Add in 2*BytesPerWord times page size to account for VM stack during
4458 // class initialization depending on 32 or 64 bit VM.
4459 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4460 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4461 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4462
4463 size_t threadStackSizeInBytes = ThreadStackSize * K;
4464 if (threadStackSizeInBytes != 0 &&
4465 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4466 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4467 os::Solaris::min_stack_allowed/K);
4468 return JNI_ERR;
4469 }
4470
4471 // For 64kbps there will be a 64kb page size, which makes
4472 // the usable default stack size quite a bit less. Increase the
4473 // stack for 64kb (or any > than 8kb) pages, this increases
4474 // virtual memory fragmentation (since we're not creating the
4475 // stack on a power of 2 boundary. The real fix for this
4476 // should be to fix the guard page mechanism.
4477
4478 if (vm_page_size() > 8*K) {
4479 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4480 ? threadStackSizeInBytes +
4481 ((StackYellowPages + StackRedPages) * vm_page_size())
4482 : 0;
4483 ThreadStackSize = threadStackSizeInBytes/K;
4484 }
4485
4486 // Make the stack size a multiple of the page size so that
4487 // the yellow/red zones can be guarded.
4488 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4489 vm_page_size()));
4490
4491 Solaris::libthread_init();
4492
4493 if (UseNUMA) {
4494 if (!Solaris::liblgrp_init()) {
4495 UseNUMA = false;
4496 } else {
4497 size_t lgrp_limit = os::numa_get_groups_num();
4498 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4499 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4500 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4501 if (lgrp_num < 2) {
4502 // There's only one locality group, disable NUMA.
4503 UseNUMA = false;
4504 }
4505 }
4506 if (!UseNUMA && ForceNUMA) {
4507 UseNUMA = true;
4508 }
4509 }
4510
4511 Solaris::signal_sets_init();
4512 Solaris::init_signal_mem();
4513 Solaris::install_signal_handlers();
4514
4515 if (libjsigversion < JSIG_VERSION_1_4_1) {
4516 Maxlibjsigsigs = OLDMAXSIGNUM;
4517 }
4518
4519 // initialize synchronization primitives to use either thread or
4520 // lwp synchronization (controlled by UseLWPSynchronization)
4521 Solaris::synchronization_init();
4522
4523 if (MaxFDLimit) {
4524 // set the number of file descriptors to max. print out error
4525 // if getrlimit/setrlimit fails but continue regardless.
4526 struct rlimit nbr_files;
4527 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4528 if (status != 0) {
4529 if (PrintMiscellaneous && (Verbose || WizardMode)) {
4530 perror("os::init_2 getrlimit failed");
4531 }
4532 } else {
4533 nbr_files.rlim_cur = nbr_files.rlim_max;
4534 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4535 if (status != 0) {
4536 if (PrintMiscellaneous && (Verbose || WizardMode)) {
4537 perror("os::init_2 setrlimit failed");
4538 }
4539 }
4540 }
4541 }
4542
4543 // Calculate theoretical max. size of Threads to guard gainst
4544 // artifical out-of-memory situations, where all available address-
4545 // space has been reserved by thread stacks. Default stack size is 1Mb.
4546 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4547 JavaThread::stack_size_at_create() : (1*K*K);
4548 assert(pre_thread_stack_size != 0, "Must have a stack");
4549 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4550 // we should start doing Virtual Memory banging. Currently when the threads will
4551 // have used all but 200Mb of space.
4552 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4553 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4554
4555 // at-exit methods are called in the reverse order of their registration.
4556 // In Solaris 7 and earlier, atexit functions are called on return from
4557 // main or as a result of a call to exit(3C). There can be only 32 of
4558 // these functions registered and atexit() does not set errno. In Solaris
4559 // 8 and later, there is no limit to the number of functions registered
4560 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4561 // functions are called upon dlclose(3DL) in addition to return from main
4562 // and exit(3C).
4563
4564 if (PerfAllowAtExitRegistration) {
4565 // only register atexit functions if PerfAllowAtExitRegistration is set.
4566 // atexit functions can be delayed until process exit time, which
4567 // can be problematic for embedded VM situations. Embedded VMs should
4568 // call DestroyJavaVM() to assure that VM resources are released.
4569
4570 // note: perfMemory_exit_helper atexit function may be removed in
4571 // the future if the appropriate cleanup code can be added to the
4572 // VM_Exit VMOperation's doit method.
4573 if (atexit(perfMemory_exit_helper) != 0) {
4574 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4575 }
4576 }
4577
4578 // Init pset_loadavg function pointer
4579 init_pset_getloadavg_ptr();
4580
4581 return JNI_OK;
4582 }
4583
4584 // Mark the polling page as unreadable
4585 void os::make_polling_page_unreadable(void) {
4586 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4587 fatal("Could not disable polling page");
4588 }
4589 }
4590
4591 // Mark the polling page as readable
4592 void os::make_polling_page_readable(void) {
4593 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4594 fatal("Could not enable polling page");
4595 }
4596 }
4597
4598 // OS interface.
4599
4600 bool os::check_heap(bool force) { return true; }
4601
4602 // Is a (classpath) directory empty?
4603 bool os::dir_is_empty(const char* path) {
4604 DIR *dir = NULL;
4605 struct dirent *ptr;
4606
4607 dir = opendir(path);
4608 if (dir == NULL) return true;
4609
4610 // Scan the directory
4611 bool result = true;
4612 char buf[sizeof(struct dirent) + MAX_PATH];
4613 struct dirent *dbuf = (struct dirent *) buf;
4614 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4615 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4616 result = false;
4617 }
4618 }
4619 closedir(dir);
4620 return result;
4621 }
4622
4623 // This code originates from JDK's sysOpen and open64_w
4624 // from src/solaris/hpi/src/system_md.c
4625
4626 int os::open(const char *path, int oflag, int mode) {
4627 if (strlen(path) > MAX_PATH - 1) {
4628 errno = ENAMETOOLONG;
4629 return -1;
4630 }
4631 int fd;
4632
4633 fd = ::open64(path, oflag, mode);
4634 if (fd == -1) return -1;
4635
4636 // If the open succeeded, the file might still be a directory
4637 {
4638 struct stat64 buf64;
4639 int ret = ::fstat64(fd, &buf64);
4640 int st_mode = buf64.st_mode;
4641
4642 if (ret != -1) {
4643 if ((st_mode & S_IFMT) == S_IFDIR) {
4644 errno = EISDIR;
4645 ::close(fd);
4646 return -1;
4647 }
4648 } else {
4649 ::close(fd);
4650 return -1;
4651 }
4652 }
4653
4654 // 32-bit Solaris systems suffer from:
4655 //
4656 // - an historical default soft limit of 256 per-process file
4657 // descriptors that is too low for many Java programs.
4658 //
4659 // - a design flaw where file descriptors created using stdio
4660 // fopen must be less than 256, _even_ when the first limit above
4661 // has been raised. This can cause calls to fopen (but not calls to
4662 // open, for example) to fail mysteriously, perhaps in 3rd party
4663 // native code (although the JDK itself uses fopen). One can hardly
4664 // criticize them for using this most standard of all functions.
4665 //
4666 // We attempt to make everything work anyways by:
4667 //
4668 // - raising the soft limit on per-process file descriptors beyond
4669 // 256
4670 //
4671 // - As of Solaris 10u4, we can request that Solaris raise the 256
4672 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4673 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4674 //
4675 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4676 // workaround the bug by remapping non-stdio file descriptors below
4677 // 256 to ones beyond 256, which is done below.
4678 //
4679 // See:
4680 // 1085341: 32-bit stdio routines should support file descriptors >255
4681 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4682 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4683 // enable_extended_FILE_stdio() in VM initialisation
4684 // Giri Mandalika's blog
4685 // http://technopark02.blogspot.com/2005_05_01_archive.html
4686 //
4687 #ifndef _LP64
4688 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4689 int newfd = ::fcntl(fd, F_DUPFD, 256);
4690 if (newfd != -1) {
4691 ::close(fd);
4692 fd = newfd;
4693 }
4694 }
4695 #endif // 32-bit Solaris
4696
4697 // All file descriptors that are opened in the JVM and not
4698 // specifically destined for a subprocess should have the
4699 // close-on-exec flag set. If we don't set it, then careless 3rd
4700 // party native code might fork and exec without closing all
4701 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4702 // UNIXProcess.c), and this in turn might:
4703 //
4704 // - cause end-of-file to fail to be detected on some file
4705 // descriptors, resulting in mysterious hangs, or
4706 //
4707 // - might cause an fopen in the subprocess to fail on a system
4708 // suffering from bug 1085341.
4709 //
4710 // (Yes, the default setting of the close-on-exec flag is a Unix
4711 // design flaw)
4712 //
4713 // See:
4714 // 1085341: 32-bit stdio routines should support file descriptors >255
4715 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4716 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4717 //
4718 #ifdef FD_CLOEXEC
4719 {
4720 int flags = ::fcntl(fd, F_GETFD);
4721 if (flags != -1) {
4722 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4723 }
4724 }
4725 #endif
4726
4727 return fd;
4728 }
4729
4730 // create binary file, rewriting existing file if required
4731 int os::create_binary_file(const char* path, bool rewrite_existing) {
4732 int oflags = O_WRONLY | O_CREAT;
4733 if (!rewrite_existing) {
4734 oflags |= O_EXCL;
4735 }
4736 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4737 }
4738
4739 // return current position of file pointer
4740 jlong os::current_file_offset(int fd) {
4741 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4742 }
4743
4744 // move file pointer to the specified offset
4745 jlong os::seek_to_file_offset(int fd, jlong offset) {
4746 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4747 }
4748
4749 jlong os::lseek(int fd, jlong offset, int whence) {
4750 return (jlong) ::lseek64(fd, offset, whence);
4751 }
4752
4753 char * os::native_path(char *path) {
4754 return path;
4755 }
4756
4757 int os::ftruncate(int fd, jlong length) {
4758 return ::ftruncate64(fd, length);
4759 }
4760
4761 int os::fsync(int fd) {
4762 RESTARTABLE_RETURN_INT(::fsync(fd));
4763 }
4764
4765 int os::available(int fd, jlong *bytes) {
4766 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4767 "Assumed _thread_in_native");
4768 jlong cur, end;
4769 int mode;
4770 struct stat64 buf64;
4771
4772 if (::fstat64(fd, &buf64) >= 0) {
4773 mode = buf64.st_mode;
4774 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4775 int n,ioctl_return;
4776
4777 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4778 if (ioctl_return>= 0) {
4779 *bytes = n;
4780 return 1;
4781 }
4782 }
4783 }
4784 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4785 return 0;
4786 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4787 return 0;
4788 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4789 return 0;
4790 }
4791 *bytes = end - cur;
4792 return 1;
4793 }
4794
4795 // Map a block of memory.
4796 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4797 char *addr, size_t bytes, bool read_only,
4798 bool allow_exec) {
4799 int prot;
4800 int flags;
4801
4802 if (read_only) {
4803 prot = PROT_READ;
4804 flags = MAP_SHARED;
4805 } else {
4806 prot = PROT_READ | PROT_WRITE;
4807 flags = MAP_PRIVATE;
4808 }
4809
4810 if (allow_exec) {
4811 prot |= PROT_EXEC;
4812 }
4813
4814 if (addr != NULL) {
4815 flags |= MAP_FIXED;
4816 }
4817
4818 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4819 fd, file_offset);
4820 if (mapped_address == MAP_FAILED) {
4821 return NULL;
4822 }
4823 return mapped_address;
4824 }
4825
4826
4827 // Remap a block of memory.
4828 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4829 char *addr, size_t bytes, bool read_only,
4830 bool allow_exec) {
4831 // same as map_memory() on this OS
4832 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4833 allow_exec);
4834 }
4835
4836
4837 // Unmap a block of memory.
4838 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4839 return munmap(addr, bytes) == 0;
4840 }
4841
4842 void os::pause() {
4843 char filename[MAX_PATH];
4844 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4845 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4846 } else {
4847 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4848 }
4849
4850 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4851 if (fd != -1) {
4852 struct stat buf;
4853 ::close(fd);
4854 while (::stat(filename, &buf) == 0) {
4855 (void)::poll(NULL, 0, 100);
4856 }
4857 } else {
4858 jio_fprintf(stderr,
4859 "Could not open pause file '%s', continuing immediately.\n", filename);
4860 }
4861 }
4862
4863 #ifndef PRODUCT
4864 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4865 // Turn this on if you need to trace synch operations.
4866 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4867 // and call record_synch_enable and record_synch_disable
4868 // around the computation of interest.
4869
4870 void record_synch(char* name, bool returning); // defined below
4871
4872 class RecordSynch {
4873 char* _name;
4874 public:
4875 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4876 ~RecordSynch() { record_synch(_name, true); }
4877 };
4878
4879 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4880 extern "C" ret name params { \
4881 typedef ret name##_t params; \
4882 static name##_t* implem = NULL; \
4883 static int callcount = 0; \
4884 if (implem == NULL) { \
4885 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4886 if (implem == NULL) fatal(dlerror()); \
4887 } \
4888 ++callcount; \
4889 RecordSynch _rs(#name); \
4890 inner; \
4891 return implem args; \
4892 }
4893 // in dbx, examine callcounts this way:
4894 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4895
4896 #define CHECK_POINTER_OK(p) \
4897 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4898 #define CHECK_MU \
4899 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4900 #define CHECK_CV \
4901 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4902 #define CHECK_P(p) \
4903 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4904
4905 #define CHECK_MUTEX(mutex_op) \
4906 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4907
4908 CHECK_MUTEX( mutex_lock)
4909 CHECK_MUTEX( _mutex_lock)
4910 CHECK_MUTEX( mutex_unlock)
4911 CHECK_MUTEX(_mutex_unlock)
4912 CHECK_MUTEX( mutex_trylock)
4913 CHECK_MUTEX(_mutex_trylock)
4914
4915 #define CHECK_COND(cond_op) \
4916 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4917
4918 CHECK_COND( cond_wait);
4919 CHECK_COND(_cond_wait);
4920 CHECK_COND(_cond_wait_cancel);
4921
4922 #define CHECK_COND2(cond_op) \
4923 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4924
4925 CHECK_COND2( cond_timedwait);
4926 CHECK_COND2(_cond_timedwait);
4927 CHECK_COND2(_cond_timedwait_cancel);
4928
4929 // do the _lwp_* versions too
4930 #define mutex_t lwp_mutex_t
4931 #define cond_t lwp_cond_t
4932 CHECK_MUTEX( _lwp_mutex_lock)
4933 CHECK_MUTEX( _lwp_mutex_unlock)
4934 CHECK_MUTEX( _lwp_mutex_trylock)
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
4941 CHECK_COND( _lwp_cond_wait);
4942 CHECK_COND( __lwp_cond_wait);
4943 CHECK_COND(___lwp_cond_wait);
4944
4945 CHECK_COND2( _lwp_cond_timedwait);
4946 CHECK_COND2( __lwp_cond_timedwait);
4947 #undef mutex_t
4948 #undef cond_t
4949
4950 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4951 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4952 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4953 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4954 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4955 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4956 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4957 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4958
4959
4960 // recording machinery:
4961
4962 enum { RECORD_SYNCH_LIMIT = 200 };
4963 char* record_synch_name[RECORD_SYNCH_LIMIT];
4964 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4965 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4966 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4967 int record_synch_count = 0;
4968 bool record_synch_enabled = false;
4969
4970 // in dbx, examine recorded data this way:
4971 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4972
4973 void record_synch(char* name, bool returning) {
4974 if (record_synch_enabled) {
4975 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4976 record_synch_name[record_synch_count] = name;
4977 record_synch_returning[record_synch_count] = returning;
4978 record_synch_thread[record_synch_count] = thr_self();
4979 record_synch_arg0ptr[record_synch_count] = &name;
4980 record_synch_count++;
4981 }
4982 // put more checking code here:
4983 // ...
4984 }
4985 }
4986
4987 void record_synch_enable() {
4988 // start collecting trace data, if not already doing so
4989 if (!record_synch_enabled) record_synch_count = 0;
4990 record_synch_enabled = true;
4991 }
4992
4993 void record_synch_disable() {
4994 // stop collecting trace data
4995 record_synch_enabled = false;
4996 }
4997
4998 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4999 #endif // PRODUCT
5000
5001 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5002 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5003 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5004
5005
5006 // JVMTI & JVM monitoring and management support
5007 // The thread_cpu_time() and current_thread_cpu_time() are only
5008 // supported if is_thread_cpu_time_supported() returns true.
5009 // They are not supported on Solaris T1.
5010
5011 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5012 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5013 // of a thread.
5014 //
5015 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5016 // returns the fast estimate available on the platform.
5017
5018 // hrtime_t gethrvtime() return value includes
5019 // user time but does not include system time
5020 jlong os::current_thread_cpu_time() {
5021 return (jlong) gethrvtime();
5022 }
5023
5024 jlong os::thread_cpu_time(Thread *thread) {
5025 // return user level CPU time only to be consistent with
5026 // what current_thread_cpu_time returns.
5027 // thread_cpu_time_info() must be changed if this changes
5028 return os::thread_cpu_time(thread, false /* user time only */);
5029 }
5030
5031 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5032 if (user_sys_cpu_time) {
5033 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5034 } else {
5035 return os::current_thread_cpu_time();
5036 }
5037 }
5038
5039 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5040 char proc_name[64];
5041 int count;
5042 prusage_t prusage;
5043 jlong lwp_time;
5044 int fd;
5045
5046 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5047 getpid(),
5048 thread->osthread()->lwp_id());
5049 fd = ::open(proc_name, O_RDONLY);
5050 if (fd == -1) return -1;
5051
5052 do {
5053 count = ::pread(fd,
5054 (void *)&prusage.pr_utime,
5055 thr_time_size,
5056 thr_time_off);
5057 } while (count < 0 && errno == EINTR);
5058 ::close(fd);
5059 if (count < 0) return -1;
5060
5061 if (user_sys_cpu_time) {
5062 // user + system CPU time
5063 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5064 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5065 (jlong)prusage.pr_stime.tv_nsec +
5066 (jlong)prusage.pr_utime.tv_nsec;
5067 } else {
5068 // user level CPU time only
5069 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5070 (jlong)prusage.pr_utime.tv_nsec;
5071 }
5072
5073 return (lwp_time);
5074 }
5075
5076 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5077 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5078 info_ptr->may_skip_backward = false; // elapsed time not wall time
5079 info_ptr->may_skip_forward = false; // elapsed time not wall time
5080 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5081 }
5082
5083 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5084 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5085 info_ptr->may_skip_backward = false; // elapsed time not wall time
5086 info_ptr->may_skip_forward = false; // elapsed time not wall time
5087 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5088 }
5089
5090 bool os::is_thread_cpu_time_supported() {
5091 return true;
5092 }
5093
5094 // System loadavg support. Returns -1 if load average cannot be obtained.
5095 // Return the load average for our processor set if the primitive exists
5096 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5097 int os::loadavg(double loadavg[], int nelem) {
5098 if (pset_getloadavg_ptr != NULL) {
5099 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5100 } else {
5101 return ::getloadavg(loadavg, nelem);
5102 }
5103 }
5104
5105 //---------------------------------------------------------------------------------
5106
5107 bool os::find(address addr, outputStream* st) {
5108 Dl_info dlinfo;
5109 memset(&dlinfo, 0, sizeof(dlinfo));
5110 if (dladdr(addr, &dlinfo) != 0) {
5111 st->print(PTR_FORMAT ": ", addr);
5112 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5113 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5114 } else if (dlinfo.dli_fbase != NULL) {
5115 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5116 } else {
5117 st->print("<absolute address>");
5118 }
5119 if (dlinfo.dli_fname != NULL) {
5120 st->print(" in %s", dlinfo.dli_fname);
5121 }
5122 if (dlinfo.dli_fbase != NULL) {
5123 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5124 }
5125 st->cr();
5126
5127 if (Verbose) {
5128 // decode some bytes around the PC
5129 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5130 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5131 address lowest = (address) dlinfo.dli_sname;
5132 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5133 if (begin < lowest) begin = lowest;
5134 Dl_info dlinfo2;
5135 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5136 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
5137 end = (address) dlinfo2.dli_saddr;
5138 }
5139 Disassembler::decode(begin, end, st);
5140 }
5141 return true;
5142 }
5143 return false;
5144 }
5145
5146 // Following function has been added to support HotSparc's libjvm.so running
5147 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5148 // src/solaris/hpi/native_threads in the EVM codebase.
5149 //
5150 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5151 // libraries and should thus be removed. We will leave it behind for a while
5152 // until we no longer want to able to run on top of 1.3.0 Solaris production
5153 // JDK. See 4341971.
5154
5155 #define STACK_SLACK 0x800
5156
5157 extern "C" {
5158 intptr_t sysThreadAvailableStackWithSlack() {
5159 stack_t st;
5160 intptr_t retval, stack_top;
5161 retval = thr_stksegment(&st);
5162 assert(retval == 0, "incorrect return value from thr_stksegment");
5163 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5164 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5165 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5166 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5167 }
5168 }
5169
5170 // ObjectMonitor park-unpark infrastructure ...
5171 //
5172 // We implement Solaris and Linux PlatformEvents with the
5173 // obvious condvar-mutex-flag triple.
5174 // Another alternative that works quite well is pipes:
5175 // Each PlatformEvent consists of a pipe-pair.
5176 // The thread associated with the PlatformEvent
5177 // calls park(), which reads from the input end of the pipe.
5178 // Unpark() writes into the other end of the pipe.
5179 // The write-side of the pipe must be set NDELAY.
5180 // Unfortunately pipes consume a large # of handles.
5181 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5182 // Using pipes for the 1st few threads might be workable, however.
5183 //
5184 // park() is permitted to return spuriously.
5185 // Callers of park() should wrap the call to park() in
5186 // an appropriate loop. A litmus test for the correct
5187 // usage of park is the following: if park() were modified
5188 // to immediately return 0 your code should still work,
5189 // albeit degenerating to a spin loop.
5190 //
5191 // In a sense, park()-unpark() just provides more polite spinning
5192 // and polling with the key difference over naive spinning being
5193 // that a parked thread needs to be explicitly unparked() in order
5194 // to wake up and to poll the underlying condition.
5195 //
5196 // Assumption:
5197 // Only one parker can exist on an event, which is why we allocate
5198 // them per-thread. Multiple unparkers can coexist.
5199 //
5200 // _Event transitions in park()
5201 // -1 => -1 : illegal
5202 // 1 => 0 : pass - return immediately
5203 // 0 => -1 : block; then set _Event to 0 before returning
5204 //
5205 // _Event transitions in unpark()
5206 // 0 => 1 : just return
5207 // 1 => 1 : just return
5208 // -1 => either 0 or 1; must signal target thread
5209 // That is, we can safely transition _Event from -1 to either
5210 // 0 or 1.
5211 //
5212 // _Event serves as a restricted-range semaphore.
5213 // -1 : thread is blocked, i.e. there is a waiter
5214 // 0 : neutral: thread is running or ready,
5215 // could have been signaled after a wait started
5216 // 1 : signaled - thread is running or ready
5217 //
5218 // Another possible encoding of _Event would be with
5219 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5220 //
5221 // TODO-FIXME: add DTRACE probes for:
5222 // 1. Tx parks
5223 // 2. Ty unparks Tx
5224 // 3. Tx resumes from park
5225
5226
5227 // value determined through experimentation
5228 #define ROUNDINGFIX 11
5229
5230 // utility to compute the abstime argument to timedwait.
5231 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5232
5233 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5234 // millis is the relative timeout time
5235 // abstime will be the absolute timeout time
5236 if (millis < 0) millis = 0;
5237 struct timeval now;
5238 int status = gettimeofday(&now, NULL);
5239 assert(status == 0, "gettimeofday");
5240 jlong seconds = millis / 1000;
5241 jlong max_wait_period;
5242
5243 if (UseLWPSynchronization) {
5244 // forward port of fix for 4275818 (not sleeping long enough)
5245 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5246 // _lwp_cond_timedwait() used a round_down algorithm rather
5247 // than a round_up. For millis less than our roundfactor
5248 // it rounded down to 0 which doesn't meet the spec.
5249 // For millis > roundfactor we may return a bit sooner, but
5250 // since we can not accurately identify the patch level and
5251 // this has already been fixed in Solaris 9 and 8 we will
5252 // leave it alone rather than always rounding down.
5253
5254 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5255 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5256 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5257 max_wait_period = 21000000;
5258 } else {
5259 max_wait_period = 50000000;
5260 }
5261 millis %= 1000;
5262 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5263 seconds = max_wait_period;
5264 }
5265 abstime->tv_sec = now.tv_sec + seconds;
5266 long usec = now.tv_usec + millis * 1000;
5267 if (usec >= 1000000) {
5268 abstime->tv_sec += 1;
5269 usec -= 1000000;
5270 }
5271 abstime->tv_nsec = usec * 1000;
5272 return abstime;
5273 }
5274
5275 void os::PlatformEvent::park() { // AKA: down()
5276 // Transitions for _Event:
5277 // -1 => -1 : illegal
5278 // 1 => 0 : pass - return immediately
5279 // 0 => -1 : block; then set _Event to 0 before returning
5280
5281 // Invariant: Only the thread associated with the Event/PlatformEvent
5282 // may call park().
5283 assert(_nParked == 0, "invariant");
5284
5285 int v;
5286 for (;;) {
5287 v = _Event;
5288 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5289 }
5290 guarantee(v >= 0, "invariant");
5291 if (v == 0) {
5292 // Do this the hard way by blocking ...
5293 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5294 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5295 // Only for SPARC >= V8PlusA
5296 #if defined(__sparc) && defined(COMPILER2)
5297 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5298 #endif
5299 int status = os::Solaris::mutex_lock(_mutex);
5300 assert_status(status == 0, status, "mutex_lock");
5301 guarantee(_nParked == 0, "invariant");
5302 ++_nParked;
5303 while (_Event < 0) {
5304 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5305 // Treat this the same as if the wait was interrupted
5306 // With usr/lib/lwp going to kernel, always handle ETIME
5307 status = os::Solaris::cond_wait(_cond, _mutex);
5308 if (status == ETIME) status = EINTR;
5309 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5310 }
5311 --_nParked;
5312 _Event = 0;
5313 status = os::Solaris::mutex_unlock(_mutex);
5314 assert_status(status == 0, status, "mutex_unlock");
5315 // Paranoia to ensure our locked and lock-free paths interact
5316 // correctly with each other.
5317 OrderAccess::fence();
5318 }
5319 }
5320
5321 int os::PlatformEvent::park(jlong millis) {
5322 // Transitions for _Event:
5323 // -1 => -1 : illegal
5324 // 1 => 0 : pass - return immediately
5325 // 0 => -1 : block; then set _Event to 0 before returning
5326
5327 guarantee(_nParked == 0, "invariant");
5328 int v;
5329 for (;;) {
5330 v = _Event;
5331 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5332 }
5333 guarantee(v >= 0, "invariant");
5334 if (v != 0) return OS_OK;
5335
5336 int ret = OS_TIMEOUT;
5337 timestruc_t abst;
5338 compute_abstime(&abst, millis);
5339
5340 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5341 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5342 // Only for SPARC >= V8PlusA
5343 #if defined(__sparc) && defined(COMPILER2)
5344 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5345 #endif
5346 int status = os::Solaris::mutex_lock(_mutex);
5347 assert_status(status == 0, status, "mutex_lock");
5348 guarantee(_nParked == 0, "invariant");
5349 ++_nParked;
5350 while (_Event < 0) {
5351 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5352 assert_status(status == 0 || status == EINTR ||
5353 status == ETIME || status == ETIMEDOUT,
5354 status, "cond_timedwait");
5355 if (!FilterSpuriousWakeups) break; // previous semantics
5356 if (status == ETIME || status == ETIMEDOUT) break;
5357 // We consume and ignore EINTR and spurious wakeups.
5358 }
5359 --_nParked;
5360 if (_Event >= 0) ret = OS_OK;
5361 _Event = 0;
5362 status = os::Solaris::mutex_unlock(_mutex);
5363 assert_status(status == 0, status, "mutex_unlock");
5364 // Paranoia to ensure our locked and lock-free paths interact
5365 // correctly with each other.
5366 OrderAccess::fence();
5367 return ret;
5368 }
5369
5370 void os::PlatformEvent::unpark() {
5371 // Transitions for _Event:
5372 // 0 => 1 : just return
5373 // 1 => 1 : just return
5374 // -1 => either 0 or 1; must signal target thread
5375 // That is, we can safely transition _Event from -1 to either
5376 // 0 or 1.
5377 // See also: "Semaphores in Plan 9" by Mullender & Cox
5378 //
5379 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5380 // that it will take two back-to-back park() calls for the owning
5381 // thread to block. This has the benefit of forcing a spurious return
5382 // from the first park() call after an unpark() call which will help
5383 // shake out uses of park() and unpark() without condition variables.
5384
5385 if (Atomic::xchg(1, &_Event) >= 0) return;
5386
5387 // If the thread associated with the event was parked, wake it.
5388 // Wait for the thread assoc with the PlatformEvent to vacate.
5389 int status = os::Solaris::mutex_lock(_mutex);
5390 assert_status(status == 0, status, "mutex_lock");
5391 int AnyWaiters = _nParked;
5392 status = os::Solaris::mutex_unlock(_mutex);
5393 assert_status(status == 0, status, "mutex_unlock");
5394 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5395 if (AnyWaiters != 0) {
5396 // Note that we signal() *after* dropping the lock for "immortal" Events.
5397 // This is safe and avoids a common class of futile wakeups. In rare
5398 // circumstances this can cause a thread to return prematurely from
5399 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5400 // will simply re-test the condition and re-park itself.
5401 // This provides particular benefit if the underlying platform does not
5402 // provide wait morphing.
5403 status = os::Solaris::cond_signal(_cond);
5404 assert_status(status == 0, status, "cond_signal");
5405 }
5406 }
5407
5408 // JSR166
5409 // -------------------------------------------------------
5410
5411 // The solaris and linux implementations of park/unpark are fairly
5412 // conservative for now, but can be improved. They currently use a
5413 // mutex/condvar pair, plus _counter.
5414 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5415 // sets count to 1 and signals condvar. Only one thread ever waits
5416 // on the condvar. Contention seen when trying to park implies that someone
5417 // is unparking you, so don't wait. And spurious returns are fine, so there
5418 // is no need to track notifications.
5419
5420 #define MAX_SECS 100000000
5421
5422 // This code is common to linux and solaris and will be moved to a
5423 // common place in dolphin.
5424 //
5425 // The passed in time value is either a relative time in nanoseconds
5426 // or an absolute time in milliseconds. Either way it has to be unpacked
5427 // into suitable seconds and nanoseconds components and stored in the
5428 // given timespec structure.
5429 // Given time is a 64-bit value and the time_t used in the timespec is only
5430 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5431 // overflow if times way in the future are given. Further on Solaris versions
5432 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5433 // number of seconds, in abstime, is less than current_time + 100,000,000.
5434 // As it will be 28 years before "now + 100000000" will overflow we can
5435 // ignore overflow and just impose a hard-limit on seconds using the value
5436 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5437 // years from "now".
5438 //
5439 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5440 assert(time > 0, "convertTime");
5441
5442 struct timeval now;
5443 int status = gettimeofday(&now, NULL);
5444 assert(status == 0, "gettimeofday");
5445
5446 time_t max_secs = now.tv_sec + MAX_SECS;
5447
5448 if (isAbsolute) {
5449 jlong secs = time / 1000;
5450 if (secs > max_secs) {
5451 absTime->tv_sec = max_secs;
5452 } else {
5453 absTime->tv_sec = secs;
5454 }
5455 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5456 } else {
5457 jlong secs = time / NANOSECS_PER_SEC;
5458 if (secs >= MAX_SECS) {
5459 absTime->tv_sec = max_secs;
5460 absTime->tv_nsec = 0;
5461 } else {
5462 absTime->tv_sec = now.tv_sec + secs;
5463 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5464 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5465 absTime->tv_nsec -= NANOSECS_PER_SEC;
5466 ++absTime->tv_sec; // note: this must be <= max_secs
5467 }
5468 }
5469 }
5470 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5471 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5472 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5473 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5474 }
5475
5476 void Parker::park(bool isAbsolute, jlong time) {
5477 // Ideally we'd do something useful while spinning, such
5478 // as calling unpackTime().
5479
5480 // Optional fast-path check:
5481 // Return immediately if a permit is available.
5482 // We depend on Atomic::xchg() having full barrier semantics
5483 // since we are doing a lock-free update to _counter.
5484 if (Atomic::xchg(0, &_counter) > 0) return;
5485
5486 // Optional fast-exit: Check interrupt before trying to wait
5487 Thread* thread = Thread::current();
5488 assert(thread->is_Java_thread(), "Must be JavaThread");
5489 JavaThread *jt = (JavaThread *)thread;
5490 if (Thread::is_interrupted(thread, false)) {
5491 return;
5492 }
5493
5494 // First, demultiplex/decode time arguments
5495 timespec absTime;
5496 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5497 return;
5498 }
5499 if (time > 0) {
5500 // Warning: this code might be exposed to the old Solaris time
5501 // round-down bugs. Grep "roundingFix" for details.
5502 unpackTime(&absTime, isAbsolute, time);
5503 }
5504
5505 // Enter safepoint region
5506 // Beware of deadlocks such as 6317397.
5507 // The per-thread Parker:: _mutex is a classic leaf-lock.
5508 // In particular a thread must never block on the Threads_lock while
5509 // holding the Parker:: mutex. If safepoints are pending both the
5510 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5511 ThreadBlockInVM tbivm(jt);
5512
5513 // Don't wait if cannot get lock since interference arises from
5514 // unblocking. Also. check interrupt before trying wait
5515 if (Thread::is_interrupted(thread, false) ||
5516 os::Solaris::mutex_trylock(_mutex) != 0) {
5517 return;
5518 }
5519
5520 int status;
5521
5522 if (_counter > 0) { // no wait needed
5523 _counter = 0;
5524 status = os::Solaris::mutex_unlock(_mutex);
5525 assert(status == 0, "invariant");
5526 // Paranoia to ensure our locked and lock-free paths interact
5527 // correctly with each other and Java-level accesses.
5528 OrderAccess::fence();
5529 return;
5530 }
5531
5532 #ifdef ASSERT
5533 // Don't catch signals while blocked; let the running threads have the signals.
5534 // (This allows a debugger to break into the running thread.)
5535 sigset_t oldsigs;
5536 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5537 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5538 #endif
5539
5540 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5541 jt->set_suspend_equivalent();
5542 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5543
5544 // Do this the hard way by blocking ...
5545 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5546 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5547 // Only for SPARC >= V8PlusA
5548 #if defined(__sparc) && defined(COMPILER2)
5549 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5550 #endif
5551
5552 if (time == 0) {
5553 status = os::Solaris::cond_wait(_cond, _mutex);
5554 } else {
5555 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5556 }
5557 // Note that an untimed cond_wait() can sometimes return ETIME on older
5558 // versions of the Solaris.
5559 assert_status(status == 0 || status == EINTR ||
5560 status == ETIME || status == ETIMEDOUT,
5561 status, "cond_timedwait");
5562
5563 #ifdef ASSERT
5564 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
5565 #endif
5566 _counter = 0;
5567 status = os::Solaris::mutex_unlock(_mutex);
5568 assert_status(status == 0, status, "mutex_unlock");
5569 // Paranoia to ensure our locked and lock-free paths interact
5570 // correctly with each other and Java-level accesses.
5571 OrderAccess::fence();
5572
5573 // If externally suspended while waiting, re-suspend
5574 if (jt->handle_special_suspend_equivalent_condition()) {
5575 jt->java_suspend_self();
5576 }
5577 }
5578
5579 void Parker::unpark() {
5580 int status = os::Solaris::mutex_lock(_mutex);
5581 assert(status == 0, "invariant");
5582 const int s = _counter;
5583 _counter = 1;
5584 status = os::Solaris::mutex_unlock(_mutex);
5585 assert(status == 0, "invariant");
5586
5587 if (s < 1) {
5588 status = os::Solaris::cond_signal(_cond);
5589 assert(status == 0, "invariant");
5590 }
5591 }
5592
5593 extern char** environ;
5594
5595 // Run the specified command in a separate process. Return its exit value,
5596 // or -1 on failure (e.g. can't fork a new process).
5597 // Unlike system(), this function can be called from signal handler. It
5598 // doesn't block SIGINT et al.
5599 int os::fork_and_exec(char* cmd) {
5600 char * argv[4];
5601 argv[0] = (char *)"sh";
5602 argv[1] = (char *)"-c";
5603 argv[2] = cmd;
5604 argv[3] = NULL;
5605
5606 // fork is async-safe, fork1 is not so can't use in signal handler
5607 pid_t pid;
5608 Thread* t = ThreadLocalStorage::get_thread_slow();
5609 if (t != NULL && t->is_inside_signal_handler()) {
5610 pid = fork();
5611 } else {
5612 pid = fork1();
5613 }
5614
5615 if (pid < 0) {
5616 // fork failed
5617 warning("fork failed: %s", strerror(errno));
5618 return -1;
5619
5620 } else if (pid == 0) {
5621 // child process
5622
5623 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5624 execve("/usr/bin/sh", argv, environ);
5625
5626 // execve failed
5627 _exit(-1);
5628
5629 } else {
5630 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5631 // care about the actual exit code, for now.
5632
5633 int status;
5634
5635 // Wait for the child process to exit. This returns immediately if
5636 // the child has already exited. */
5637 while (waitpid(pid, &status, 0) < 0) {
5638 switch (errno) {
5639 case ECHILD: return 0;
5640 case EINTR: break;
5641 default: return -1;
5642 }
5643 }
5644
5645 if (WIFEXITED(status)) {
5646 // The child exited normally; get its exit code.
5647 return WEXITSTATUS(status);
5648 } else if (WIFSIGNALED(status)) {
5649 // The child exited because of a signal
5650 // The best value to return is 0x80 + signal number,
5651 // because that is what all Unix shells do, and because
5652 // it allows callers to distinguish between process exit and
5653 // process death by signal.
5654 return 0x80 + WTERMSIG(status);
5655 } else {
5656 // Unknown exit code; pass it through
5657 return status;
5658 }
5659 }
5660 }
5661
5662 // is_headless_jre()
5663 //
5664 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5665 // in order to report if we are running in a headless jre
5666 //
5667 // Since JDK8 xawt/libmawt.so was moved into the same directory
5668 // as libawt.so, and renamed libawt_xawt.so
5669 //
5670 bool os::is_headless_jre() {
5671 struct stat statbuf;
5672 char buf[MAXPATHLEN];
5673 char libmawtpath[MAXPATHLEN];
5674 const char *xawtstr = "/xawt/libmawt.so";
5675 const char *new_xawtstr = "/libawt_xawt.so";
5676 char *p;
5677
5678 // Get path to libjvm.so
5679 os::jvm_path(buf, sizeof(buf));
5680
5681 // Get rid of libjvm.so
5682 p = strrchr(buf, '/');
5683 if (p == NULL) {
5684 return false;
5685 } else {
5686 *p = '\0';
5687 }
5688
5689 // Get rid of client or server
5690 p = strrchr(buf, '/');
5691 if (p == NULL) {
5692 return false;
5693 } else {
5694 *p = '\0';
5695 }
5696
5697 // check xawt/libmawt.so
5698 strcpy(libmawtpath, buf);
5699 strcat(libmawtpath, xawtstr);
5700 if (::stat(libmawtpath, &statbuf) == 0) return false;
5701
5702 // check libawt_xawt.so
5703 strcpy(libmawtpath, buf);
5704 strcat(libmawtpath, new_xawtstr);
5705 if (::stat(libmawtpath, &statbuf) == 0) return false;
5706
5707 return true;
5708 }
5709
5710 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5711 size_t res;
5712 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5713 "Assumed _thread_in_native");
5714 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5715 return res;
5716 }
5717
5718 int os::close(int fd) {
5719 return ::close(fd);
5720 }
5721
5722 int os::socket_close(int fd) {
5723 return ::close(fd);
5724 }
5725
5726 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5727 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5728 "Assumed _thread_in_native");
5729 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5730 }
5731
5732 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5733 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5734 "Assumed _thread_in_native");
5735 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5736 }
5737
5738 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5739 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5740 }
5741
5742 // As both poll and select can be interrupted by signals, we have to be
5743 // prepared to restart the system call after updating the timeout, unless
5744 // a poll() is done with timeout == -1, in which case we repeat with this
5745 // "wait forever" value.
5746
5747 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5748 int _result;
5749 _result = ::connect(fd, him, len);
5750
5751 // On Solaris, when a connect() call is interrupted, the connection
5752 // can be established asynchronously (see 6343810). Subsequent calls
5753 // to connect() must check the errno value which has the semantic
5754 // described below (copied from the connect() man page). Handling
5755 // of asynchronously established connections is required for both
5756 // blocking and non-blocking sockets.
5757 // EINTR The connection attempt was interrupted
5758 // before any data arrived by the delivery of
5759 // a signal. The connection, however, will be
5760 // established asynchronously.
5761 //
5762 // EINPROGRESS The socket is non-blocking, and the connec-
5763 // tion cannot be completed immediately.
5764 //
5765 // EALREADY The socket is non-blocking, and a previous
5766 // connection attempt has not yet been com-
5767 // pleted.
5768 //
5769 // EISCONN The socket is already connected.
5770 if (_result == OS_ERR && errno == EINTR) {
5771 // restarting a connect() changes its errno semantics
5772 RESTARTABLE(::connect(fd, him, len), _result);
5773 // undo these changes
5774 if (_result == OS_ERR) {
5775 if (errno == EALREADY) {
5776 errno = EINPROGRESS; // fall through
5777 } else if (errno == EISCONN) {
5778 errno = 0;
5779 return OS_OK;
5780 }
5781 }
5782 }
5783 return _result;
5784 }
5785
5786 // Get the default path to the core file
5787 // Returns the length of the string
5788 int os::get_core_path(char* buffer, size_t bufferSize) {
5789 const char* p = get_current_directory(buffer, bufferSize);
5790
5791 if (p == NULL) {
5792 assert(p != NULL, "failed to get current directory");
5793 return 0;
5794 }
5795
5796 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5797 p, current_process_id());
5798
5799 return strlen(buffer);
5800 }
5801
5802 #ifndef PRODUCT
5803 void TestReserveMemorySpecial_test() {
5804 // No tests available for this platform
5805 }
5806 #endif