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 // see thr_setprio(3T) for the basis of these numbers
142 #define MinimumPriority 0
143 #define NormalPriority 64
144 #define MaximumPriority 127
145
146 // Values for ThreadPriorityPolicy == 1
147 int prio_policy1[CriticalPriority+1] = {
148 -99999, 0, 16, 32, 48, 64,
149 80, 96, 112, 124, 127, 127 };
150
151 // System parameters used internally
152 static clock_t clock_tics_per_sec = 100;
153
154 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
155 static bool enabled_extended_FILE_stdio = false;
156
157 // For diagnostics to print a message once. see run_periodic_checks
158 static bool check_addr0_done = false;
159 static sigset_t check_signal_done;
160 static bool check_signals = true;
161
162 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
163 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
164
165 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
166
167
168 // "default" initializers for missing libc APIs
169 extern "C" {
170 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
171 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
172
173 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
174 static int lwp_cond_destroy(cond_t *cv) { return 0; }
175 }
176
177 // "default" initializers for pthread-based synchronization
178 extern "C" {
179 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
180 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
181 }
182
183 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
184
185 static inline size_t adjust_stack_size(address base, size_t size) {
186 if ((ssize_t)size < 0) {
187 // 4759953: Compensate for ridiculous stack size.
188 size = max_intx;
189 }
190 if (size > (size_t)base) {
191 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
192 size = (size_t)base;
193 }
194 return size;
195 }
196
197 static inline stack_t get_stack_info() {
198 stack_t st;
199 int retval = thr_stksegment(&st);
200 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
201 assert(retval == 0, "incorrect return value from thr_stksegment");
202 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
203 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
204 return st;
205 }
206
207 address os::current_stack_base() {
208 int r = thr_main();
209 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
210 bool is_primordial_thread = r;
211
212 // Workaround 4352906, avoid calls to thr_stksegment by
213 // thr_main after the first one (it looks like we trash
214 // some data, causing the value for ss_sp to be incorrect).
215 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
216 stack_t st = get_stack_info();
217 if (is_primordial_thread) {
218 // cache initial value of stack base
219 os::Solaris::_main_stack_base = (address)st.ss_sp;
220 }
221 return (address)st.ss_sp;
222 } else {
223 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
224 return os::Solaris::_main_stack_base;
225 }
226 }
227
228 size_t os::current_stack_size() {
229 size_t size;
230
231 int r = thr_main();
232 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
233 if (!r) {
234 size = get_stack_info().ss_size;
235 } else {
236 struct rlimit limits;
237 getrlimit(RLIMIT_STACK, &limits);
238 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
239 }
240 // base may not be page aligned
241 address base = current_stack_base();
242 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
243 return (size_t)(base - bottom);
244 }
245
246 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
247 return localtime_r(clock, res);
248 }
249
250 void os::Solaris::try_enable_extended_io() {
251 typedef int (*enable_extended_FILE_stdio_t)(int, int);
252
253 if (!UseExtendedFileIO) {
254 return;
255 }
256
257 enable_extended_FILE_stdio_t enabler =
258 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
259 "enable_extended_FILE_stdio");
260 if (enabler) {
261 enabler(-1, -1);
262 }
263 }
264
265 static int _processors_online = 0;
266
267 jint os::Solaris::_os_thread_limit = 0;
268 volatile jint os::Solaris::_os_thread_count = 0;
269
270 julong os::available_memory() {
271 return Solaris::available_memory();
272 }
273
274 julong os::Solaris::available_memory() {
275 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
276 }
277
278 julong os::Solaris::_physical_memory = 0;
279
280 julong os::physical_memory() {
281 return Solaris::physical_memory();
282 }
283
284 static hrtime_t first_hrtime = 0;
285 static const hrtime_t hrtime_hz = 1000*1000*1000;
286 static volatile hrtime_t max_hrtime = 0;
287
288
289 void os::Solaris::initialize_system_info() {
290 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
291 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
292 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
293 (julong)sysconf(_SC_PAGESIZE);
294 }
295
296 int os::active_processor_count() {
297 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
298 pid_t pid = getpid();
299 psetid_t pset = PS_NONE;
300 // Are we running in a processor set or is there any processor set around?
301 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
302 uint_t pset_cpus;
303 // Query the number of cpus available to us.
304 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
305 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
306 _processors_online = pset_cpus;
307 return pset_cpus;
308 }
309 }
310 // Otherwise return number of online cpus
311 return online_cpus;
312 }
313
314 static bool find_processors_in_pset(psetid_t pset,
315 processorid_t** id_array,
316 uint_t* id_length) {
317 bool result = false;
318 // Find the number of processors in the processor set.
319 if (pset_info(pset, NULL, id_length, NULL) == 0) {
320 // Make up an array to hold their ids.
321 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
322 // Fill in the array with their processor ids.
323 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
324 result = true;
325 }
326 }
327 return result;
328 }
329
330 // Callers of find_processors_online() must tolerate imprecise results --
331 // the system configuration can change asynchronously because of DR
332 // or explicit psradm operations.
333 //
334 // We also need to take care that the loop (below) terminates as the
335 // number of processors online can change between the _SC_NPROCESSORS_ONLN
336 // request and the loop that builds the list of processor ids. Unfortunately
337 // there's no reliable way to determine the maximum valid processor id,
338 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
339 // man pages, which claim the processor id set is "sparse, but
340 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
341 // exit the loop.
342 //
343 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
344 // not available on S8.0.
345
346 static bool find_processors_online(processorid_t** id_array,
347 uint* id_length) {
348 const processorid_t MAX_PROCESSOR_ID = 100000;
349 // Find the number of processors online.
350 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
351 // Make up an array to hold their ids.
352 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
353 // Processors need not be numbered consecutively.
354 long found = 0;
355 processorid_t next = 0;
356 while (found < *id_length && next < MAX_PROCESSOR_ID) {
357 processor_info_t info;
358 if (processor_info(next, &info) == 0) {
359 // NB, PI_NOINTR processors are effectively online ...
360 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
361 (*id_array)[found] = next;
362 found += 1;
363 }
364 }
365 next += 1;
366 }
367 if (found < *id_length) {
368 // The loop above didn't identify the expected number of processors.
369 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
370 // and re-running the loop, above, but there's no guarantee of progress
371 // if the system configuration is in flux. Instead, we just return what
372 // we've got. Note that in the worst case find_processors_online() could
373 // return an empty set. (As a fall-back in the case of the empty set we
374 // could just return the ID of the current processor).
375 *id_length = found;
376 }
377
378 return true;
379 }
380
381 static bool assign_distribution(processorid_t* id_array,
382 uint id_length,
383 uint* distribution,
384 uint distribution_length) {
385 // We assume we can assign processorid_t's to uint's.
386 assert(sizeof(processorid_t) == sizeof(uint),
387 "can't convert processorid_t to uint");
388 // Quick check to see if we won't succeed.
389 if (id_length < distribution_length) {
390 return false;
391 }
392 // Assign processor ids to the distribution.
393 // Try to shuffle processors to distribute work across boards,
394 // assuming 4 processors per board.
395 const uint processors_per_board = ProcessDistributionStride;
396 // Find the maximum processor id.
397 processorid_t max_id = 0;
398 for (uint m = 0; m < id_length; m += 1) {
399 max_id = MAX2(max_id, id_array[m]);
400 }
401 // The next id, to limit loops.
402 const processorid_t limit_id = max_id + 1;
403 // Make up markers for available processors.
404 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
405 for (uint c = 0; c < limit_id; c += 1) {
406 available_id[c] = false;
407 }
408 for (uint a = 0; a < id_length; a += 1) {
409 available_id[id_array[a]] = true;
410 }
411 // Step by "boards", then by "slot", copying to "assigned".
412 // NEEDS_CLEANUP: The assignment of processors should be stateful,
413 // remembering which processors have been assigned by
414 // previous calls, etc., so as to distribute several
415 // independent calls of this method. What we'd like is
416 // It would be nice to have an API that let us ask
417 // how many processes are bound to a processor,
418 // but we don't have that, either.
419 // In the short term, "board" is static so that
420 // subsequent distributions don't all start at board 0.
421 static uint board = 0;
422 uint assigned = 0;
423 // Until we've found enough processors ....
424 while (assigned < distribution_length) {
425 // ... find the next available processor in the board.
426 for (uint slot = 0; slot < processors_per_board; slot += 1) {
427 uint try_id = board * processors_per_board + slot;
428 if ((try_id < limit_id) && (available_id[try_id] == true)) {
429 distribution[assigned] = try_id;
430 available_id[try_id] = false;
431 assigned += 1;
432 break;
433 }
434 }
435 board += 1;
436 if (board * processors_per_board + 0 >= limit_id) {
437 board = 0;
438 }
439 }
440 if (available_id != NULL) {
441 FREE_C_HEAP_ARRAY(bool, available_id);
442 }
443 return true;
444 }
445
446 void os::set_native_thread_name(const char *name) {
447 // Not yet implemented.
448 return;
449 }
450
451 bool os::distribute_processes(uint length, uint* distribution) {
452 bool result = false;
453 // Find the processor id's of all the available CPUs.
454 processorid_t* id_array = NULL;
455 uint id_length = 0;
456 // There are some races between querying information and using it,
457 // since processor sets can change dynamically.
458 psetid_t pset = PS_NONE;
459 // Are we running in a processor set?
460 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
461 result = find_processors_in_pset(pset, &id_array, &id_length);
462 } else {
463 result = find_processors_online(&id_array, &id_length);
464 }
465 if (result == true) {
466 if (id_length >= length) {
467 result = assign_distribution(id_array, id_length, distribution, length);
468 } else {
469 result = false;
470 }
471 }
472 if (id_array != NULL) {
473 FREE_C_HEAP_ARRAY(processorid_t, id_array);
474 }
475 return result;
476 }
477
478 bool os::bind_to_processor(uint processor_id) {
479 // We assume that a processorid_t can be stored in a uint.
480 assert(sizeof(uint) == sizeof(processorid_t),
481 "can't convert uint to processorid_t");
482 int bind_result =
483 processor_bind(P_LWPID, // bind LWP.
484 P_MYID, // bind current LWP.
485 (processorid_t) processor_id, // id.
486 NULL); // don't return old binding.
487 return (bind_result == 0);
488 }
489
490 // Return true if user is running as root.
491
492 bool os::have_special_privileges() {
493 static bool init = false;
494 static bool privileges = false;
495 if (!init) {
496 privileges = (getuid() != geteuid()) || (getgid() != getegid());
497 init = true;
498 }
499 return privileges;
500 }
501
502
503 void os::init_system_properties_values() {
504 // The next steps are taken in the product version:
505 //
506 // Obtain the JAVA_HOME value from the location of libjvm.so.
507 // This library should be located at:
508 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
509 //
510 // If "/jre/lib/" appears at the right place in the path, then we
511 // assume libjvm.so is installed in a JDK and we use this path.
512 //
513 // Otherwise exit with message: "Could not create the Java virtual machine."
514 //
515 // The following extra steps are taken in the debugging version:
516 //
517 // If "/jre/lib/" does NOT appear at the right place in the path
518 // instead of exit check for $JAVA_HOME environment variable.
519 //
520 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
521 // then we append a fake suffix "hotspot/libjvm.so" to this path so
522 // it looks like libjvm.so is installed there
523 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
524 //
525 // Otherwise exit.
526 //
527 // Important note: if the location of libjvm.so changes this
528 // code needs to be changed accordingly.
529
530 // Base path of extensions installed on the system.
531 #define SYS_EXT_DIR "/usr/jdk/packages"
532 #define EXTENSIONS_DIR "/lib/ext"
533
534 char cpu_arch[12];
535 // Buffer that fits several sprintfs.
536 // Note that the space for the colon and the trailing null are provided
537 // by the nulls included by the sizeof operator.
538 const size_t bufsize =
539 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
540 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
541 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
542 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
543
544 // sysclasspath, java_home, dll_dir
545 {
546 char *pslash;
547 os::jvm_path(buf, bufsize);
548
549 // Found the full path to libjvm.so.
550 // Now cut the path to <java_home>/jre if we can.
551 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
552 pslash = strrchr(buf, '/');
553 if (pslash != NULL) {
554 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
555 }
556 Arguments::set_dll_dir(buf);
557
558 if (pslash != NULL) {
559 pslash = strrchr(buf, '/');
560 if (pslash != NULL) {
561 *pslash = '\0'; // Get rid of /<arch>.
562 pslash = strrchr(buf, '/');
563 if (pslash != NULL) {
564 *pslash = '\0'; // Get rid of /lib.
565 }
566 }
567 }
568 Arguments::set_java_home(buf);
569 set_boot_path('/', ':');
570 }
571
572 // Where to look for native libraries.
573 {
574 // Use dlinfo() to determine the correct java.library.path.
575 //
576 // If we're launched by the Java launcher, and the user
577 // does not set java.library.path explicitly on the commandline,
578 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
579 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
580 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
581 // /usr/lib), which is exactly what we want.
582 //
583 // If the user does set java.library.path, it completely
584 // overwrites this setting, and always has.
585 //
586 // If we're not launched by the Java launcher, we may
587 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
588 // settings. Again, dlinfo does exactly what we want.
589
590 Dl_serinfo info_sz, *info = &info_sz;
591 Dl_serpath *path;
592 char *library_path;
593 char *common_path = buf;
594
595 // Determine search path count and required buffer size.
596 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
597 FREE_C_HEAP_ARRAY(char, buf);
598 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
599 }
600
601 // Allocate new buffer and initialize.
602 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
603 info->dls_size = info_sz.dls_size;
604 info->dls_cnt = info_sz.dls_cnt;
605
606 // Obtain search path information.
607 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
608 FREE_C_HEAP_ARRAY(char, buf);
609 FREE_C_HEAP_ARRAY(char, info);
610 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
611 }
612
613 path = &info->dls_serpath[0];
614
615 // Note: Due to a legacy implementation, most of the library path
616 // is set in the launcher. This was to accomodate linking restrictions
617 // on legacy Solaris implementations (which are no longer supported).
618 // Eventually, all the library path setting will be done here.
619 //
620 // However, to prevent the proliferation of improperly built native
621 // libraries, the new path component /usr/jdk/packages is added here.
622
623 // Determine the actual CPU architecture.
624 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
625 #ifdef _LP64
626 // If we are a 64-bit vm, perform the following translations:
627 // sparc -> sparcv9
628 // i386 -> amd64
629 if (strcmp(cpu_arch, "sparc") == 0) {
630 strcat(cpu_arch, "v9");
631 } else if (strcmp(cpu_arch, "i386") == 0) {
632 strcpy(cpu_arch, "amd64");
633 }
634 #endif
635
636 // Construct the invariant part of ld_library_path.
637 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
638
639 // Struct size is more than sufficient for the path components obtained
640 // through the dlinfo() call, so only add additional space for the path
641 // components explicitly added here.
642 size_t library_path_size = info->dls_size + strlen(common_path);
643 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
644 library_path[0] = '\0';
645
646 // Construct the desired Java library path from the linker's library
647 // search path.
648 //
649 // For compatibility, it is optimal that we insert the additional path
650 // components specific to the Java VM after those components specified
651 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
652 // infrastructure.
653 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
654 strcpy(library_path, common_path);
655 } else {
656 int inserted = 0;
657 int i;
658 for (i = 0; i < info->dls_cnt; i++, path++) {
659 uint_t flags = path->dls_flags & LA_SER_MASK;
660 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
661 strcat(library_path, common_path);
662 strcat(library_path, os::path_separator());
663 inserted = 1;
664 }
665 strcat(library_path, path->dls_name);
666 strcat(library_path, os::path_separator());
667 }
668 // Eliminate trailing path separator.
669 library_path[strlen(library_path)-1] = '\0';
670 }
671
672 // happens before argument parsing - can't use a trace flag
673 // tty->print_raw("init_system_properties_values: native lib path: ");
674 // tty->print_raw_cr(library_path);
675
676 // Callee copies into its own buffer.
677 Arguments::set_library_path(library_path);
678
679 FREE_C_HEAP_ARRAY(char, library_path);
680 FREE_C_HEAP_ARRAY(char, info);
681 }
682
683 // Extensions directories.
684 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
685 Arguments::set_ext_dirs(buf);
686
687 FREE_C_HEAP_ARRAY(char, buf);
688
689 #undef SYS_EXT_DIR
690 #undef EXTENSIONS_DIR
691 }
692
693 void os::breakpoint() {
694 BREAKPOINT;
695 }
696
697 bool os::obsolete_option(const JavaVMOption *option) {
698 if (!strncmp(option->optionString, "-Xt", 3)) {
699 return true;
700 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
701 return true;
702 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
703 return true;
704 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
705 return true;
706 }
707 return false;
708 }
709
710 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
711 address stackStart = (address)thread->stack_base();
712 address stackEnd = (address)(stackStart - (address)thread->stack_size());
713 if (sp < stackStart && sp >= stackEnd) return true;
714 return false;
715 }
716
717 extern "C" void breakpoint() {
718 // use debugger to set breakpoint here
719 }
720
721 static thread_t main_thread;
722
723 // Thread start routine for all new Java threads
724 extern "C" void* java_start(void* thread_addr) {
725 // Try to randomize the cache line index of hot stack frames.
726 // This helps when threads of the same stack traces evict each other's
727 // cache lines. The threads can be either from the same JVM instance, or
728 // from different JVM instances. The benefit is especially true for
729 // processors with hyperthreading technology.
730 static int counter = 0;
731 int pid = os::current_process_id();
732 alloca(((pid ^ counter++) & 7) * 128);
733
734 int prio;
735 Thread* thread = (Thread*)thread_addr;
736 OSThread* osthr = thread->osthread();
737
738 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
739 thread->_schedctl = (void *) schedctl_init();
740
741 if (UseNUMA) {
742 int lgrp_id = os::numa_get_group_id();
743 if (lgrp_id != -1) {
744 thread->set_lgrp_id(lgrp_id);
745 }
746 }
747
748 // If the creator called set priority before we started,
749 // we need to call set_native_priority now that we have an lwp.
750 // We used to get the priority from thr_getprio (we called
751 // thr_setprio way back in create_thread) and pass it to
752 // set_native_priority, but Solaris scales the priority
753 // in java_to_os_priority, so when we read it back here,
754 // we pass trash to set_native_priority instead of what's
755 // in java_to_os_priority. So we save the native priority
756 // in the osThread and recall it here.
757
758 if (osthr->thread_id() != -1) {
759 if (UseThreadPriorities) {
760 int prio = osthr->native_priority();
761 if (ThreadPriorityVerbose) {
762 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
763 INTPTR_FORMAT ", setting priority: %d\n",
764 osthr->thread_id(), osthr->lwp_id(), prio);
765 }
766 os::set_native_priority(thread, prio);
767 }
768 } else if (ThreadPriorityVerbose) {
769 warning("Can't set priority in _start routine, thread id hasn't been set\n");
770 }
771
772 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
773
774 // initialize signal mask for this thread
775 os::Solaris::hotspot_sigmask(thread);
776
777 thread->run();
778
779 // One less thread is executing
780 // When the VMThread gets here, the main thread may have already exited
781 // which frees the CodeHeap containing the Atomic::dec code
782 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
783 Atomic::dec(&os::Solaris::_os_thread_count);
784 }
785
786 if (UseDetachedThreads) {
787 thr_exit(NULL);
788 ShouldNotReachHere();
789 }
790 return NULL;
791 }
792
793 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
794 // Allocate the OSThread object
795 OSThread* osthread = new OSThread(NULL, NULL);
796 if (osthread == NULL) return NULL;
797
798 // Store info on the Solaris thread into the OSThread
799 osthread->set_thread_id(thread_id);
800 osthread->set_lwp_id(_lwp_self());
801 thread->_schedctl = (void *) schedctl_init();
802
803 if (UseNUMA) {
804 int lgrp_id = os::numa_get_group_id();
805 if (lgrp_id != -1) {
806 thread->set_lgrp_id(lgrp_id);
807 }
808 }
809
810 if (ThreadPriorityVerbose) {
811 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
812 osthread->thread_id(), osthread->lwp_id());
813 }
814
815 // Initial thread state is INITIALIZED, not SUSPENDED
816 osthread->set_state(INITIALIZED);
817
818 return osthread;
819 }
820
821 void os::Solaris::hotspot_sigmask(Thread* thread) {
822 //Save caller's signal mask
823 sigset_t sigmask;
824 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask);
825 OSThread *osthread = thread->osthread();
826 osthread->set_caller_sigmask(sigmask);
827
828 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
829 if (!ReduceSignalUsage) {
830 if (thread->is_VM_thread()) {
831 // Only the VM thread handles BREAK_SIGNAL ...
832 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL);
833 } else {
834 // ... all other threads block BREAK_SIGNAL
835 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
836 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL);
837 }
838 }
839 }
840
841 bool os::create_attached_thread(JavaThread* thread) {
842 #ifdef ASSERT
843 thread->verify_not_published();
844 #endif
845 OSThread* osthread = create_os_thread(thread, thr_self());
846 if (osthread == NULL) {
847 return false;
848 }
849
850 // Initial thread state is RUNNABLE
851 osthread->set_state(RUNNABLE);
852 thread->set_osthread(osthread);
853
854 // initialize signal mask for this thread
855 // and save the caller's signal mask
856 os::Solaris::hotspot_sigmask(thread);
857
858 return true;
859 }
860
861 bool os::create_main_thread(JavaThread* thread) {
862 #ifdef ASSERT
863 thread->verify_not_published();
864 #endif
865 if (_starting_thread == NULL) {
866 _starting_thread = create_os_thread(thread, main_thread);
867 if (_starting_thread == NULL) {
868 return false;
869 }
870 }
871
872 // The primodial thread is runnable from the start
873 _starting_thread->set_state(RUNNABLE);
874
875 thread->set_osthread(_starting_thread);
876
877 // initialize signal mask for this thread
878 // and save the caller's signal mask
879 os::Solaris::hotspot_sigmask(thread);
880
881 return true;
882 }
883
884
885 bool os::create_thread(Thread* thread, ThreadType thr_type,
886 size_t stack_size) {
887 // Allocate the OSThread object
888 OSThread* osthread = new OSThread(NULL, NULL);
889 if (osthread == NULL) {
890 return false;
891 }
892
893 if (ThreadPriorityVerbose) {
894 char *thrtyp;
895 switch (thr_type) {
896 case vm_thread:
897 thrtyp = (char *)"vm";
898 break;
899 case cgc_thread:
900 thrtyp = (char *)"cgc";
901 break;
902 case pgc_thread:
903 thrtyp = (char *)"pgc";
904 break;
905 case java_thread:
906 thrtyp = (char *)"java";
907 break;
908 case compiler_thread:
909 thrtyp = (char *)"compiler";
910 break;
911 case watcher_thread:
912 thrtyp = (char *)"watcher";
913 break;
914 default:
915 thrtyp = (char *)"unknown";
916 break;
917 }
918 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
919 }
920
921 // Calculate stack size if it's not specified by caller.
922 if (stack_size == 0) {
923 // The default stack size 1M (2M for LP64).
924 stack_size = (BytesPerWord >> 2) * K * K;
925
926 switch (thr_type) {
927 case os::java_thread:
928 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
929 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
930 break;
931 case os::compiler_thread:
932 if (CompilerThreadStackSize > 0) {
933 stack_size = (size_t)(CompilerThreadStackSize * K);
934 break;
935 } // else fall through:
936 // use VMThreadStackSize if CompilerThreadStackSize is not defined
937 case os::vm_thread:
938 case os::pgc_thread:
939 case os::cgc_thread:
940 case os::watcher_thread:
941 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
942 break;
943 }
944 }
945 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
946
947 // Initial state is ALLOCATED but not INITIALIZED
948 osthread->set_state(ALLOCATED);
949
950 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
951 // We got lots of threads. Check if we still have some address space left.
952 // Need to be at least 5Mb of unreserved address space. We do check by
953 // trying to reserve some.
954 const size_t VirtualMemoryBangSize = 20*K*K;
955 char* mem = os::reserve_memory(VirtualMemoryBangSize);
956 if (mem == NULL) {
957 delete osthread;
958 return false;
959 } else {
960 // Release the memory again
961 os::release_memory(mem, VirtualMemoryBangSize);
962 }
963 }
964
965 // Setup osthread because the child thread may need it.
966 thread->set_osthread(osthread);
967
968 // Create the Solaris thread
969 thread_t tid = 0;
970 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
971 int status;
972
973 // Mark that we don't have an lwp or thread id yet.
974 // In case we attempt to set the priority before the thread starts.
975 osthread->set_lwp_id(-1);
976 osthread->set_thread_id(-1);
977
978 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
979 if (status != 0) {
980 if (PrintMiscellaneous && (Verbose || WizardMode)) {
981 perror("os::create_thread");
982 }
983 thread->set_osthread(NULL);
984 // Need to clean up stuff we've allocated so far
985 delete osthread;
986 return false;
987 }
988
989 Atomic::inc(&os::Solaris::_os_thread_count);
990
991 // Store info on the Solaris thread into the OSThread
992 osthread->set_thread_id(tid);
993
994 // Remember that we created this thread so we can set priority on it
995 osthread->set_vm_created();
996
997 // Initial thread state is INITIALIZED, not SUSPENDED
998 osthread->set_state(INITIALIZED);
999
1000 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1001 return true;
1002 }
1003
1004 // defined for >= Solaris 10. This allows builds on earlier versions
1005 // of Solaris to take advantage of the newly reserved Solaris JVM signals
1006 // With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2 and -XX:+UseAltSigs does
1007 // nothing since these should have no conflict. Previously INTERRUPT_SIGNAL
1008 // was SIGJVM1.
1009 //
1010 #if !defined(SIGJVM1)
1011 #define SIGJVM1 39
1012 #define SIGJVM2 40
1013 #endif
1014
1015 debug_only(static bool signal_sets_initialized = false);
1016 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1017
1018 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1019
1020 bool os::Solaris::is_sig_ignored(int sig) {
1021 struct sigaction oact;
1022 sigaction(sig, (struct sigaction*)NULL, &oact);
1023 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1024 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1025 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1026 return true;
1027 } else {
1028 return false;
1029 }
1030 }
1031
1032 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1033 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1034 static bool isJVM1available() {
1035 return SIGJVM1 < SIGRTMIN;
1036 }
1037
1038 void os::Solaris::signal_sets_init() {
1039 // Should also have an assertion stating we are still single-threaded.
1040 assert(!signal_sets_initialized, "Already initialized");
1041 // Fill in signals that are necessarily unblocked for all threads in
1042 // the VM. Currently, we unblock the following signals:
1043 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1044 // by -Xrs (=ReduceSignalUsage));
1045 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1046 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1047 // the dispositions or masks wrt these signals.
1048 // Programs embedding the VM that want to use the above signals for their
1049 // own purposes must, at this time, use the "-Xrs" option to prevent
1050 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1051 // (See bug 4345157, and other related bugs).
1052 // In reality, though, unblocking these signals is really a nop, since
1053 // these signals are not blocked by default.
1054 sigemptyset(&unblocked_sigs);
1055 sigemptyset(&allowdebug_blocked_sigs);
1056 sigaddset(&unblocked_sigs, SIGILL);
1057 sigaddset(&unblocked_sigs, SIGSEGV);
1058 sigaddset(&unblocked_sigs, SIGBUS);
1059 sigaddset(&unblocked_sigs, SIGFPE);
1060
1061 if (isJVM1available) {
1062 os::Solaris::set_SIGasync(SIGJVM2);
1063 } else if (UseAltSigs) {
1064 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL);
1065 } else {
1066 os::Solaris::set_SIGasync(ASYNC_SIGNAL);
1067 }
1068
1069 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1070
1071 if (!ReduceSignalUsage) {
1072 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1073 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1074 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1075 }
1076 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1077 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1078 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1079 }
1080 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1081 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1082 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1083 }
1084 }
1085 // Fill in signals that are blocked by all but the VM thread.
1086 sigemptyset(&vm_sigs);
1087 if (!ReduceSignalUsage) {
1088 sigaddset(&vm_sigs, BREAK_SIGNAL);
1089 }
1090 debug_only(signal_sets_initialized = true);
1091
1092 // For diagnostics only used in run_periodic_checks
1093 sigemptyset(&check_signal_done);
1094 }
1095
1096 // These are signals that are unblocked while a thread is running Java.
1097 // (For some reason, they get blocked by default.)
1098 sigset_t* os::Solaris::unblocked_signals() {
1099 assert(signal_sets_initialized, "Not initialized");
1100 return &unblocked_sigs;
1101 }
1102
1103 // These are the signals that are blocked while a (non-VM) thread is
1104 // running Java. Only the VM thread handles these signals.
1105 sigset_t* os::Solaris::vm_signals() {
1106 assert(signal_sets_initialized, "Not initialized");
1107 return &vm_sigs;
1108 }
1109
1110 // These are signals that are blocked during cond_wait to allow debugger in
1111 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1112 assert(signal_sets_initialized, "Not initialized");
1113 return &allowdebug_blocked_sigs;
1114 }
1115
1116
1117 void _handle_uncaught_cxx_exception() {
1118 VMError::report_and_die("An uncaught C++ exception");
1119 }
1120
1121
1122 // First crack at OS-specific initialization, from inside the new thread.
1123 void os::initialize_thread(Thread* thr) {
1124 int r = thr_main();
1125 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1126 if (r) {
1127 JavaThread* jt = (JavaThread *)thr;
1128 assert(jt != NULL, "Sanity check");
1129 size_t stack_size;
1130 address base = jt->stack_base();
1131 if (Arguments::created_by_java_launcher()) {
1132 // Use 2MB to allow for Solaris 7 64 bit mode.
1133 stack_size = JavaThread::stack_size_at_create() == 0
1134 ? 2048*K : JavaThread::stack_size_at_create();
1135
1136 // There are rare cases when we may have already used more than
1137 // the basic stack size allotment before this method is invoked.
1138 // Attempt to allow for a normally sized java_stack.
1139 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1140 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1141 } else {
1142 // 6269555: If we were not created by a Java launcher, i.e. if we are
1143 // running embedded in a native application, treat the primordial thread
1144 // as much like a native attached thread as possible. This means using
1145 // the current stack size from thr_stksegment(), unless it is too large
1146 // to reliably setup guard pages. A reasonable max size is 8MB.
1147 size_t current_size = current_stack_size();
1148 // This should never happen, but just in case....
1149 if (current_size == 0) current_size = 2 * K * K;
1150 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1151 }
1152 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1153 stack_size = (size_t)(base - bottom);
1154
1155 assert(stack_size > 0, "Stack size calculation problem");
1156
1157 if (stack_size > jt->stack_size()) {
1158 #ifndef PRODUCT
1159 struct rlimit limits;
1160 getrlimit(RLIMIT_STACK, &limits);
1161 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1162 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1163 #endif
1164 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1165 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1166 "See limit(1) to increase the stack size limit.",
1167 stack_size / K, jt->stack_size() / K);
1168 vm_exit(1);
1169 }
1170 assert(jt->stack_size() >= stack_size,
1171 "Attempt to map more stack than was allocated");
1172 jt->set_stack_size(stack_size);
1173 }
1174
1175 // With the T2 libthread (T1 is no longer supported) threads are always bound
1176 // and we use stackbanging in all cases.
1177
1178 os::Solaris::init_thread_fpu_state();
1179 std::set_terminate(_handle_uncaught_cxx_exception);
1180 }
1181
1182
1183
1184 // Free Solaris resources related to the OSThread
1185 void os::free_thread(OSThread* osthread) {
1186 assert(osthread != NULL, "os::free_thread but osthread not set");
1187
1188
1189 // We are told to free resources of the argument thread,
1190 // but we can only really operate on the current thread.
1191 // The main thread must take the VMThread down synchronously
1192 // before the main thread exits and frees up CodeHeap
1193 guarantee((Thread::current()->osthread() == osthread
1194 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1195 if (Thread::current()->osthread() == osthread) {
1196 // Restore caller's signal mask
1197 sigset_t sigmask = osthread->caller_sigmask();
1198 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL);
1199 }
1200 delete osthread;
1201 }
1202
1203 void os::pd_start_thread(Thread* thread) {
1204 int status = thr_continue(thread->osthread()->thread_id());
1205 assert_status(status == 0, status, "thr_continue failed");
1206 }
1207
1208
1209 intx os::current_thread_id() {
1210 return (intx)thr_self();
1211 }
1212
1213 static pid_t _initial_pid = 0;
1214
1215 int os::current_process_id() {
1216 return (int)(_initial_pid ? _initial_pid : getpid());
1217 }
1218
1219 // gethrtime() should be monotonic according to the documentation,
1220 // but some virtualized platforms are known to break this guarantee.
1221 // getTimeNanos() must be guaranteed not to move backwards, so we
1222 // are forced to add a check here.
1223 inline hrtime_t getTimeNanos() {
1224 const hrtime_t now = gethrtime();
1225 const hrtime_t prev = max_hrtime;
1226 if (now <= prev) {
1227 return prev; // same or retrograde time;
1228 }
1229 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1230 assert(obsv >= prev, "invariant"); // Monotonicity
1231 // If the CAS succeeded then we're done and return "now".
1232 // If the CAS failed and the observed value "obsv" is >= now then
1233 // we should return "obsv". If the CAS failed and now > obsv > prv then
1234 // some other thread raced this thread and installed a new value, in which case
1235 // we could either (a) retry the entire operation, (b) retry trying to install now
1236 // or (c) just return obsv. We use (c). No loop is required although in some cases
1237 // we might discard a higher "now" value in deference to a slightly lower but freshly
1238 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1239 // to (a) or (b) -- and greatly reduces coherence traffic.
1240 // We might also condition (c) on the magnitude of the delta between obsv and now.
1241 // Avoiding excessive CAS operations to hot RW locations is critical.
1242 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1243 return (prev == obsv) ? now : obsv;
1244 }
1245
1246 // Time since start-up in seconds to a fine granularity.
1247 // Used by VMSelfDestructTimer and the MemProfiler.
1248 double os::elapsedTime() {
1249 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1250 }
1251
1252 jlong os::elapsed_counter() {
1253 return (jlong)(getTimeNanos() - first_hrtime);
1254 }
1255
1256 jlong os::elapsed_frequency() {
1257 return hrtime_hz;
1258 }
1259
1260 // Return the real, user, and system times in seconds from an
1261 // arbitrary fixed point in the past.
1262 bool os::getTimesSecs(double* process_real_time,
1263 double* process_user_time,
1264 double* process_system_time) {
1265 struct tms ticks;
1266 clock_t real_ticks = times(&ticks);
1267
1268 if (real_ticks == (clock_t) (-1)) {
1269 return false;
1270 } else {
1271 double ticks_per_second = (double) clock_tics_per_sec;
1272 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1273 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1274 // For consistency return the real time from getTimeNanos()
1275 // converted to seconds.
1276 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1277
1278 return true;
1279 }
1280 }
1281
1282 bool os::supports_vtime() { return true; }
1283
1284 bool os::enable_vtime() {
1285 int fd = ::open("/proc/self/ctl", O_WRONLY);
1286 if (fd == -1) {
1287 return false;
1288 }
1289
1290 long cmd[] = { PCSET, PR_MSACCT };
1291 int res = ::write(fd, cmd, sizeof(long) * 2);
1292 ::close(fd);
1293 if (res != sizeof(long) * 2) {
1294 return false;
1295 }
1296 return true;
1297 }
1298
1299 bool os::vtime_enabled() {
1300 int fd = ::open("/proc/self/status", O_RDONLY);
1301 if (fd == -1) {
1302 return false;
1303 }
1304
1305 pstatus_t status;
1306 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1307 ::close(fd);
1308 if (res != sizeof(pstatus_t)) {
1309 return false;
1310 }
1311 return status.pr_flags & PR_MSACCT;
1312 }
1313
1314 double os::elapsedVTime() {
1315 return (double)gethrvtime() / (double)hrtime_hz;
1316 }
1317
1318 // Used internally for comparisons only
1319 // getTimeMillis guaranteed to not move backwards on Solaris
1320 jlong getTimeMillis() {
1321 jlong nanotime = getTimeNanos();
1322 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1323 }
1324
1325 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1326 jlong os::javaTimeMillis() {
1327 timeval t;
1328 if (gettimeofday(&t, NULL) == -1) {
1329 fatal("os::javaTimeMillis: gettimeofday (%s)", strerror(errno));
1330 }
1331 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1332 }
1333
1334 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1335 timeval t;
1336 if (gettimeofday(&t, NULL) == -1) {
1337 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", strerror(errno));
1338 }
1339 seconds = jlong(t.tv_sec);
1340 nanos = jlong(t.tv_usec) * 1000;
1341 }
1342
1343
1344 jlong os::javaTimeNanos() {
1345 return (jlong)getTimeNanos();
1346 }
1347
1348 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1349 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1350 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1351 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1352 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1353 }
1354
1355 char * os::local_time_string(char *buf, size_t buflen) {
1356 struct tm t;
1357 time_t long_time;
1358 time(&long_time);
1359 localtime_r(&long_time, &t);
1360 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1361 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1362 t.tm_hour, t.tm_min, t.tm_sec);
1363 return buf;
1364 }
1365
1366 // Note: os::shutdown() might be called very early during initialization, or
1367 // called from signal handler. Before adding something to os::shutdown(), make
1368 // sure it is async-safe and can handle partially initialized VM.
1369 void os::shutdown() {
1370
1371 // allow PerfMemory to attempt cleanup of any persistent resources
1372 perfMemory_exit();
1373
1374 // needs to remove object in file system
1375 AttachListener::abort();
1376
1377 // flush buffered output, finish log files
1378 ostream_abort();
1379
1380 // Check for abort hook
1381 abort_hook_t abort_hook = Arguments::abort_hook();
1382 if (abort_hook != NULL) {
1383 abort_hook();
1384 }
1385 }
1386
1387 // Note: os::abort() might be called very early during initialization, or
1388 // called from signal handler. Before adding something to os::abort(), make
1389 // sure it is async-safe and can handle partially initialized VM.
1390 void os::abort(bool dump_core, void* siginfo, void* context) {
1391 os::shutdown();
1392 if (dump_core) {
1393 #ifndef PRODUCT
1394 fdStream out(defaultStream::output_fd());
1395 out.print_raw("Current thread is ");
1396 char buf[16];
1397 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1398 out.print_raw_cr(buf);
1399 out.print_raw_cr("Dumping core ...");
1400 #endif
1401 ::abort(); // dump core (for debugging)
1402 }
1403
1404 ::exit(1);
1405 }
1406
1407 // Die immediately, no exit hook, no abort hook, no cleanup.
1408 void os::die() {
1409 ::abort(); // dump core (for debugging)
1410 }
1411
1412 // DLL functions
1413
1414 const char* os::dll_file_extension() { return ".so"; }
1415
1416 // This must be hard coded because it's the system's temporary
1417 // directory not the java application's temp directory, ala java.io.tmpdir.
1418 const char* os::get_temp_directory() { return "/tmp"; }
1419
1420 static bool file_exists(const char* filename) {
1421 struct stat statbuf;
1422 if (filename == NULL || strlen(filename) == 0) {
1423 return false;
1424 }
1425 return os::stat(filename, &statbuf) == 0;
1426 }
1427
1428 bool os::dll_build_name(char* buffer, size_t buflen,
1429 const char* pname, const char* fname) {
1430 bool retval = false;
1431 const size_t pnamelen = pname ? strlen(pname) : 0;
1432
1433 // Return error on buffer overflow.
1434 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1435 return retval;
1436 }
1437
1438 if (pnamelen == 0) {
1439 snprintf(buffer, buflen, "lib%s.so", fname);
1440 retval = true;
1441 } else if (strchr(pname, *os::path_separator()) != NULL) {
1442 int n;
1443 char** pelements = split_path(pname, &n);
1444 if (pelements == NULL) {
1445 return false;
1446 }
1447 for (int i = 0; i < n; i++) {
1448 // really shouldn't be NULL but what the heck, check can't hurt
1449 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1450 continue; // skip the empty path values
1451 }
1452 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1453 if (file_exists(buffer)) {
1454 retval = true;
1455 break;
1456 }
1457 }
1458 // release the storage
1459 for (int i = 0; i < n; i++) {
1460 if (pelements[i] != NULL) {
1461 FREE_C_HEAP_ARRAY(char, pelements[i]);
1462 }
1463 }
1464 if (pelements != NULL) {
1465 FREE_C_HEAP_ARRAY(char*, pelements);
1466 }
1467 } else {
1468 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1469 retval = true;
1470 }
1471 return retval;
1472 }
1473
1474 // check if addr is inside libjvm.so
1475 bool os::address_is_in_vm(address addr) {
1476 static address libjvm_base_addr;
1477 Dl_info dlinfo;
1478
1479 if (libjvm_base_addr == NULL) {
1480 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1481 libjvm_base_addr = (address)dlinfo.dli_fbase;
1482 }
1483 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1484 }
1485
1486 if (dladdr((void *)addr, &dlinfo) != 0) {
1487 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1488 }
1489
1490 return false;
1491 }
1492
1493 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1494 static dladdr1_func_type dladdr1_func = NULL;
1495
1496 bool os::dll_address_to_function_name(address addr, char *buf,
1497 int buflen, int * offset,
1498 bool demangle) {
1499 // buf is not optional, but offset is optional
1500 assert(buf != NULL, "sanity check");
1501
1502 Dl_info dlinfo;
1503
1504 // dladdr1_func was initialized in os::init()
1505 if (dladdr1_func != NULL) {
1506 // yes, we have dladdr1
1507
1508 // Support for dladdr1 is checked at runtime; it may be
1509 // available even if the vm is built on a machine that does
1510 // not have dladdr1 support. Make sure there is a value for
1511 // RTLD_DL_SYMENT.
1512 #ifndef RTLD_DL_SYMENT
1513 #define RTLD_DL_SYMENT 1
1514 #endif
1515 #ifdef _LP64
1516 Elf64_Sym * info;
1517 #else
1518 Elf32_Sym * info;
1519 #endif
1520 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1521 RTLD_DL_SYMENT) != 0) {
1522 // see if we have a matching symbol that covers our address
1523 if (dlinfo.dli_saddr != NULL &&
1524 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1525 if (dlinfo.dli_sname != NULL) {
1526 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1527 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1528 }
1529 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1530 return true;
1531 }
1532 }
1533 // no matching symbol so try for just file info
1534 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1535 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1536 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1537 return true;
1538 }
1539 }
1540 }
1541 buf[0] = '\0';
1542 if (offset != NULL) *offset = -1;
1543 return false;
1544 }
1545
1546 // no, only dladdr is available
1547 if (dladdr((void *)addr, &dlinfo) != 0) {
1548 // see if we have a matching symbol
1549 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1550 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1551 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1552 }
1553 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1554 return true;
1555 }
1556 // no matching symbol so try for just file info
1557 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1558 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1559 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1560 return true;
1561 }
1562 }
1563 }
1564 buf[0] = '\0';
1565 if (offset != NULL) *offset = -1;
1566 return false;
1567 }
1568
1569 bool os::dll_address_to_library_name(address addr, char* buf,
1570 int buflen, int* offset) {
1571 // buf is not optional, but offset is optional
1572 assert(buf != NULL, "sanity check");
1573
1574 Dl_info dlinfo;
1575
1576 if (dladdr((void*)addr, &dlinfo) != 0) {
1577 if (dlinfo.dli_fname != NULL) {
1578 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1579 }
1580 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1581 *offset = addr - (address)dlinfo.dli_fbase;
1582 }
1583 return true;
1584 }
1585
1586 buf[0] = '\0';
1587 if (offset) *offset = -1;
1588 return false;
1589 }
1590
1591 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1592 Dl_info dli;
1593 // Sanity check?
1594 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1595 dli.dli_fname == NULL) {
1596 return 1;
1597 }
1598
1599 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1600 if (handle == NULL) {
1601 return 1;
1602 }
1603
1604 Link_map *map;
1605 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1606 if (map == NULL) {
1607 dlclose(handle);
1608 return 1;
1609 }
1610
1611 while (map->l_prev != NULL) {
1612 map = map->l_prev;
1613 }
1614
1615 while (map != NULL) {
1616 // Iterate through all map entries and call callback with fields of interest
1617 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1618 dlclose(handle);
1619 return 1;
1620 }
1621 map = map->l_next;
1622 }
1623
1624 dlclose(handle);
1625 return 0;
1626 }
1627
1628 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1629 outputStream * out = (outputStream *) param;
1630 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1631 return 0;
1632 }
1633
1634 void os::print_dll_info(outputStream * st) {
1635 st->print_cr("Dynamic libraries:"); st->flush();
1636 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1637 st->print_cr("Error: Cannot print dynamic libraries.");
1638 }
1639 }
1640
1641 // Loads .dll/.so and
1642 // in case of error it checks if .dll/.so was built for the
1643 // same architecture as Hotspot is running on
1644
1645 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1646 void * result= ::dlopen(filename, RTLD_LAZY);
1647 if (result != NULL) {
1648 // Successful loading
1649 return result;
1650 }
1651
1652 Elf32_Ehdr elf_head;
1653
1654 // Read system error message into ebuf
1655 // It may or may not be overwritten below
1656 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1657 ebuf[ebuflen-1]='\0';
1658 int diag_msg_max_length=ebuflen-strlen(ebuf);
1659 char* diag_msg_buf=ebuf+strlen(ebuf);
1660
1661 if (diag_msg_max_length==0) {
1662 // No more space in ebuf for additional diagnostics message
1663 return NULL;
1664 }
1665
1666
1667 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1668
1669 if (file_descriptor < 0) {
1670 // Can't open library, report dlerror() message
1671 return NULL;
1672 }
1673
1674 bool failed_to_read_elf_head=
1675 (sizeof(elf_head)!=
1676 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1677
1678 ::close(file_descriptor);
1679 if (failed_to_read_elf_head) {
1680 // file i/o error - report dlerror() msg
1681 return NULL;
1682 }
1683
1684 typedef struct {
1685 Elf32_Half code; // Actual value as defined in elf.h
1686 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1687 char elf_class; // 32 or 64 bit
1688 char endianess; // MSB or LSB
1689 char* name; // String representation
1690 } arch_t;
1691
1692 static const arch_t arch_array[]={
1693 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1694 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1695 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1696 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1697 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1698 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1699 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1700 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1701 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1702 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1703 };
1704
1705 #if (defined IA32)
1706 static Elf32_Half running_arch_code=EM_386;
1707 #elif (defined AMD64)
1708 static Elf32_Half running_arch_code=EM_X86_64;
1709 #elif (defined IA64)
1710 static Elf32_Half running_arch_code=EM_IA_64;
1711 #elif (defined __sparc) && (defined _LP64)
1712 static Elf32_Half running_arch_code=EM_SPARCV9;
1713 #elif (defined __sparc) && (!defined _LP64)
1714 static Elf32_Half running_arch_code=EM_SPARC;
1715 #elif (defined __powerpc64__)
1716 static Elf32_Half running_arch_code=EM_PPC64;
1717 #elif (defined __powerpc__)
1718 static Elf32_Half running_arch_code=EM_PPC;
1719 #elif (defined ARM)
1720 static Elf32_Half running_arch_code=EM_ARM;
1721 #else
1722 #error Method os::dll_load requires that one of following is defined:\
1723 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1724 #endif
1725
1726 // Identify compatability class for VM's architecture and library's architecture
1727 // Obtain string descriptions for architectures
1728
1729 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1730 int running_arch_index=-1;
1731
1732 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1733 if (running_arch_code == arch_array[i].code) {
1734 running_arch_index = i;
1735 }
1736 if (lib_arch.code == arch_array[i].code) {
1737 lib_arch.compat_class = arch_array[i].compat_class;
1738 lib_arch.name = arch_array[i].name;
1739 }
1740 }
1741
1742 assert(running_arch_index != -1,
1743 "Didn't find running architecture code (running_arch_code) in arch_array");
1744 if (running_arch_index == -1) {
1745 // Even though running architecture detection failed
1746 // we may still continue with reporting dlerror() message
1747 return NULL;
1748 }
1749
1750 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1751 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1752 return NULL;
1753 }
1754
1755 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1756 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1757 return NULL;
1758 }
1759
1760 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1761 if (lib_arch.name!=NULL) {
1762 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1763 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1764 lib_arch.name, arch_array[running_arch_index].name);
1765 } else {
1766 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1767 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1768 lib_arch.code,
1769 arch_array[running_arch_index].name);
1770 }
1771 }
1772
1773 return NULL;
1774 }
1775
1776 void* os::dll_lookup(void* handle, const char* name) {
1777 return dlsym(handle, name);
1778 }
1779
1780 void* os::get_default_process_handle() {
1781 return (void*)::dlopen(NULL, RTLD_LAZY);
1782 }
1783
1784 int os::stat(const char *path, struct stat *sbuf) {
1785 char pathbuf[MAX_PATH];
1786 if (strlen(path) > MAX_PATH - 1) {
1787 errno = ENAMETOOLONG;
1788 return -1;
1789 }
1790 os::native_path(strcpy(pathbuf, path));
1791 return ::stat(pathbuf, sbuf);
1792 }
1793
1794 static bool _print_ascii_file(const char* filename, outputStream* st) {
1795 int fd = ::open(filename, O_RDONLY);
1796 if (fd == -1) {
1797 return false;
1798 }
1799
1800 char buf[32];
1801 int bytes;
1802 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1803 st->print_raw(buf, bytes);
1804 }
1805
1806 ::close(fd);
1807
1808 return true;
1809 }
1810
1811 void os::print_os_info_brief(outputStream* st) {
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
1819 void os::print_os_info(outputStream* st) {
1820 st->print("OS:");
1821
1822 os::Solaris::print_distro_info(st);
1823
1824 os::Posix::print_uname_info(st);
1825
1826 os::Solaris::print_libversion_info(st);
1827
1828 os::Posix::print_rlimit_info(st);
1829
1830 os::Posix::print_load_average(st);
1831 }
1832
1833 void os::Solaris::print_distro_info(outputStream* st) {
1834 if (!_print_ascii_file("/etc/release", st)) {
1835 st->print("Solaris");
1836 }
1837 st->cr();
1838 }
1839
1840 void os::get_summary_os_info(char* buf, size_t buflen) {
1841 strncpy(buf, "Solaris", buflen); // default to plain solaris
1842 FILE* fp = fopen("/etc/release", "r");
1843 if (fp != NULL) {
1844 char tmp[256];
1845 // Only get the first line and chop out everything but the os name.
1846 if (fgets(tmp, sizeof(tmp), fp)) {
1847 char* ptr = tmp;
1848 // skip past whitespace characters
1849 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1850 if (*ptr != '\0') {
1851 char* nl = strchr(ptr, '\n');
1852 if (nl != NULL) *nl = '\0';
1853 strncpy(buf, ptr, buflen);
1854 }
1855 }
1856 fclose(fp);
1857 }
1858 }
1859
1860 void os::Solaris::print_libversion_info(outputStream* st) {
1861 st->print(" (T2 libthread)");
1862 st->cr();
1863 }
1864
1865 static bool check_addr0(outputStream* st) {
1866 jboolean status = false;
1867 int fd = ::open("/proc/self/map",O_RDONLY);
1868 if (fd >= 0) {
1869 prmap_t p;
1870 while (::read(fd, &p, sizeof(p)) > 0) {
1871 if (p.pr_vaddr == 0x0) {
1872 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname);
1873 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname);
1874 st->print("Access:");
1875 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-");
1876 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-");
1877 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-");
1878 st->cr();
1879 status = true;
1880 }
1881 }
1882 ::close(fd);
1883 }
1884 return status;
1885 }
1886
1887 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1888 // Get MHz with system call. We don't seem to already have this.
1889 processor_info_t stats;
1890 processorid_t id = getcpuid();
1891 int clock = 0;
1892 if (processor_info(id, &stats) != -1) {
1893 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1894 }
1895 #ifdef AMD64
1896 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1897 #else
1898 // must be sparc
1899 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1900 #endif
1901 }
1902
1903 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1904 // Nothing to do for now.
1905 }
1906
1907 void os::print_memory_info(outputStream* st) {
1908 st->print("Memory:");
1909 st->print(" %dk page", os::vm_page_size()>>10);
1910 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1911 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1912 st->cr();
1913 (void) check_addr0(st);
1914 }
1915
1916 void os::print_siginfo(outputStream* st, void* siginfo) {
1917 const siginfo_t* si = (const siginfo_t*)siginfo;
1918
1919 os::Posix::print_siginfo_brief(st, si);
1920
1921 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
1922 UseSharedSpaces) {
1923 FileMapInfo* mapinfo = FileMapInfo::current_info();
1924 if (mapinfo->is_in_shared_space(si->si_addr)) {
1925 st->print("\n\nError accessing class data sharing archive." \
1926 " Mapped file inaccessible during execution, " \
1927 " possible disk/network problem.");
1928 }
1929 }
1930 st->cr();
1931 }
1932
1933 // Moved from whole group, because we need them here for diagnostic
1934 // prints.
1935 #define OLDMAXSIGNUM 32
1936 static int Maxsignum = 0;
1937 static int *ourSigFlags = NULL;
1938
1939 int os::Solaris::get_our_sigflags(int sig) {
1940 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1941 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1942 return ourSigFlags[sig];
1943 }
1944
1945 void os::Solaris::set_our_sigflags(int sig, int flags) {
1946 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1947 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1948 ourSigFlags[sig] = flags;
1949 }
1950
1951
1952 static const char* get_signal_handler_name(address handler,
1953 char* buf, int buflen) {
1954 int offset;
1955 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1956 if (found) {
1957 // skip directory names
1958 const char *p1, *p2;
1959 p1 = buf;
1960 size_t len = strlen(os::file_separator());
1961 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1962 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1963 } else {
1964 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1965 }
1966 return buf;
1967 }
1968
1969 static void print_signal_handler(outputStream* st, int sig,
1970 char* buf, size_t buflen) {
1971 struct sigaction sa;
1972
1973 sigaction(sig, NULL, &sa);
1974
1975 st->print("%s: ", os::exception_name(sig, buf, buflen));
1976
1977 address handler = (sa.sa_flags & SA_SIGINFO)
1978 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1979 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1980
1981 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1982 st->print("SIG_DFL");
1983 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1984 st->print("SIG_IGN");
1985 } else {
1986 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1987 }
1988
1989 st->print(", sa_mask[0]=");
1990 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1991
1992 address rh = VMError::get_resetted_sighandler(sig);
1993 // May be, handler was resetted by VMError?
1994 if (rh != NULL) {
1995 handler = rh;
1996 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1997 }
1998
1999 st->print(", sa_flags=");
2000 os::Posix::print_sa_flags(st, sa.sa_flags);
2001
2002 // Check: is it our handler?
2003 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
2004 // It is our signal handler
2005 // check for flags
2006 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2007 st->print(
2008 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2009 os::Solaris::get_our_sigflags(sig));
2010 }
2011 }
2012 st->cr();
2013 }
2014
2015 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2016 st->print_cr("Signal Handlers:");
2017 print_signal_handler(st, SIGSEGV, buf, buflen);
2018 print_signal_handler(st, SIGBUS , buf, buflen);
2019 print_signal_handler(st, SIGFPE , buf, buflen);
2020 print_signal_handler(st, SIGPIPE, buf, buflen);
2021 print_signal_handler(st, SIGXFSZ, buf, buflen);
2022 print_signal_handler(st, SIGILL , buf, buflen);
2023 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2024 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2025 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2026 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2027 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2028 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2029 }
2030
2031 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2032
2033 // Find the full path to the current module, libjvm.so
2034 void os::jvm_path(char *buf, jint buflen) {
2035 // Error checking.
2036 if (buflen < MAXPATHLEN) {
2037 assert(false, "must use a large-enough buffer");
2038 buf[0] = '\0';
2039 return;
2040 }
2041 // Lazy resolve the path to current module.
2042 if (saved_jvm_path[0] != 0) {
2043 strcpy(buf, saved_jvm_path);
2044 return;
2045 }
2046
2047 Dl_info dlinfo;
2048 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2049 assert(ret != 0, "cannot locate libjvm");
2050 if (ret != 0 && dlinfo.dli_fname != NULL) {
2051 realpath((char *)dlinfo.dli_fname, buf);
2052 } else {
2053 buf[0] = '\0';
2054 return;
2055 }
2056
2057 if (Arguments::sun_java_launcher_is_altjvm()) {
2058 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2059 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2060 // If "/jre/lib/" appears at the right place in the string, then
2061 // assume we are installed in a JDK and we're done. Otherwise, check
2062 // for a JAVA_HOME environment variable and fix up the path so it
2063 // looks like libjvm.so is installed there (append a fake suffix
2064 // hotspot/libjvm.so).
2065 const char *p = buf + strlen(buf) - 1;
2066 for (int count = 0; p > buf && count < 5; ++count) {
2067 for (--p; p > buf && *p != '/'; --p)
2068 /* empty */ ;
2069 }
2070
2071 if (strncmp(p, "/jre/lib/", 9) != 0) {
2072 // Look for JAVA_HOME in the environment.
2073 char* java_home_var = ::getenv("JAVA_HOME");
2074 if (java_home_var != NULL && java_home_var[0] != 0) {
2075 char cpu_arch[12];
2076 char* jrelib_p;
2077 int len;
2078 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2079 #ifdef _LP64
2080 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2081 if (strcmp(cpu_arch, "sparc") == 0) {
2082 strcat(cpu_arch, "v9");
2083 } else if (strcmp(cpu_arch, "i386") == 0) {
2084 strcpy(cpu_arch, "amd64");
2085 }
2086 #endif
2087 // Check the current module name "libjvm.so".
2088 p = strrchr(buf, '/');
2089 assert(strstr(p, "/libjvm") == p, "invalid library name");
2090
2091 realpath(java_home_var, buf);
2092 // determine if this is a legacy image or modules image
2093 // modules image doesn't have "jre" subdirectory
2094 len = strlen(buf);
2095 assert(len < buflen, "Ran out of buffer space");
2096 jrelib_p = buf + len;
2097 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2098 if (0 != access(buf, F_OK)) {
2099 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2100 }
2101
2102 if (0 == access(buf, F_OK)) {
2103 // Use current module name "libjvm.so"
2104 len = strlen(buf);
2105 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2106 } else {
2107 // Go back to path of .so
2108 realpath((char *)dlinfo.dli_fname, buf);
2109 }
2110 }
2111 }
2112 }
2113
2114 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2115 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2116 }
2117
2118
2119 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2120 // no prefix required, not even "_"
2121 }
2122
2123
2124 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2125 // no suffix required
2126 }
2127
2128 // This method is a copy of JDK's sysGetLastErrorString
2129 // from src/solaris/hpi/src/system_md.c
2130
2131 size_t os::lasterror(char *buf, size_t len) {
2132 if (errno == 0) return 0;
2133
2134 const char *s = ::strerror(errno);
2135 size_t n = ::strlen(s);
2136 if (n >= len) {
2137 n = len - 1;
2138 }
2139 ::strncpy(buf, s, n);
2140 buf[n] = '\0';
2141 return n;
2142 }
2143
2144
2145 // sun.misc.Signal
2146
2147 extern "C" {
2148 static void UserHandler(int sig, void *siginfo, void *context) {
2149 // Ctrl-C is pressed during error reporting, likely because the error
2150 // handler fails to abort. Let VM die immediately.
2151 if (sig == SIGINT && is_error_reported()) {
2152 os::die();
2153 }
2154
2155 os::signal_notify(sig);
2156 // We do not need to reinstate the signal handler each time...
2157 }
2158 }
2159
2160 void* os::user_handler() {
2161 return CAST_FROM_FN_PTR(void*, UserHandler);
2162 }
2163
2164 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2165 struct timespec ts;
2166 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2167
2168 return ts;
2169 }
2170
2171 extern "C" {
2172 typedef void (*sa_handler_t)(int);
2173 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2174 }
2175
2176 void* os::signal(int signal_number, void* handler) {
2177 struct sigaction sigAct, oldSigAct;
2178 sigfillset(&(sigAct.sa_mask));
2179 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2180 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2181
2182 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2183 // -1 means registration failed
2184 return (void *)-1;
2185 }
2186
2187 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2188 }
2189
2190 void os::signal_raise(int signal_number) {
2191 raise(signal_number);
2192 }
2193
2194 // The following code is moved from os.cpp for making this
2195 // code platform specific, which it is by its very nature.
2196
2197 // a counter for each possible signal value
2198 static int Sigexit = 0;
2199 static int Maxlibjsigsigs;
2200 static jint *pending_signals = NULL;
2201 static int *preinstalled_sigs = NULL;
2202 static struct sigaction *chainedsigactions = NULL;
2203 static sema_t sig_sem;
2204 typedef int (*version_getting_t)();
2205 version_getting_t os::Solaris::get_libjsig_version = NULL;
2206 static int libjsigversion = NULL;
2207
2208 int os::sigexitnum_pd() {
2209 assert(Sigexit > 0, "signal memory not yet initialized");
2210 return Sigexit;
2211 }
2212
2213 void os::Solaris::init_signal_mem() {
2214 // Initialize signal structures
2215 Maxsignum = SIGRTMAX;
2216 Sigexit = Maxsignum+1;
2217 assert(Maxsignum >0, "Unable to obtain max signal number");
2218
2219 Maxlibjsigsigs = Maxsignum;
2220
2221 // pending_signals has one int per signal
2222 // The additional signal is for SIGEXIT - exit signal to signal_thread
2223 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2224 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2225
2226 if (UseSignalChaining) {
2227 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2228 * (Maxsignum + 1), mtInternal);
2229 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2230 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2231 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2232 }
2233 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2234 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2235 }
2236
2237 void os::signal_init_pd() {
2238 int ret;
2239
2240 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2241 assert(ret == 0, "sema_init() failed");
2242 }
2243
2244 void os::signal_notify(int signal_number) {
2245 int ret;
2246
2247 Atomic::inc(&pending_signals[signal_number]);
2248 ret = ::sema_post(&sig_sem);
2249 assert(ret == 0, "sema_post() failed");
2250 }
2251
2252 static int check_pending_signals(bool wait_for_signal) {
2253 int ret;
2254 while (true) {
2255 for (int i = 0; i < Sigexit + 1; i++) {
2256 jint n = pending_signals[i];
2257 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2258 return i;
2259 }
2260 }
2261 if (!wait_for_signal) {
2262 return -1;
2263 }
2264 JavaThread *thread = JavaThread::current();
2265 ThreadBlockInVM tbivm(thread);
2266
2267 bool threadIsSuspended;
2268 do {
2269 thread->set_suspend_equivalent();
2270 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2271 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2272 ;
2273 assert(ret == 0, "sema_wait() failed");
2274
2275 // were we externally suspended while we were waiting?
2276 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2277 if (threadIsSuspended) {
2278 // The semaphore has been incremented, but while we were waiting
2279 // another thread suspended us. We don't want to continue running
2280 // while suspended because that would surprise the thread that
2281 // suspended us.
2282 ret = ::sema_post(&sig_sem);
2283 assert(ret == 0, "sema_post() failed");
2284
2285 thread->java_suspend_self();
2286 }
2287 } while (threadIsSuspended);
2288 }
2289 }
2290
2291 int os::signal_lookup() {
2292 return check_pending_signals(false);
2293 }
2294
2295 int os::signal_wait() {
2296 return check_pending_signals(true);
2297 }
2298
2299 ////////////////////////////////////////////////////////////////////////////////
2300 // Virtual Memory
2301
2302 static int page_size = -1;
2303
2304 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2305 // clear this var if support is not available.
2306 static bool has_map_align = true;
2307
2308 int os::vm_page_size() {
2309 assert(page_size != -1, "must call os::init");
2310 return page_size;
2311 }
2312
2313 // Solaris allocates memory by pages.
2314 int os::vm_allocation_granularity() {
2315 assert(page_size != -1, "must call os::init");
2316 return page_size;
2317 }
2318
2319 static bool recoverable_mmap_error(int err) {
2320 // See if the error is one we can let the caller handle. This
2321 // list of errno values comes from the Solaris mmap(2) man page.
2322 switch (err) {
2323 case EBADF:
2324 case EINVAL:
2325 case ENOTSUP:
2326 // let the caller deal with these errors
2327 return true;
2328
2329 default:
2330 // Any remaining errors on this OS can cause our reserved mapping
2331 // to be lost. That can cause confusion where different data
2332 // structures think they have the same memory mapped. The worst
2333 // scenario is if both the VM and a library think they have the
2334 // same memory mapped.
2335 return false;
2336 }
2337 }
2338
2339 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2340 int err) {
2341 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2342 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2343 strerror(err), err);
2344 }
2345
2346 static void warn_fail_commit_memory(char* addr, size_t bytes,
2347 size_t alignment_hint, bool exec,
2348 int err) {
2349 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2350 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2351 alignment_hint, exec, strerror(err), err);
2352 }
2353
2354 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2355 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2356 size_t size = bytes;
2357 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2358 if (res != NULL) {
2359 if (UseNUMAInterleaving) {
2360 numa_make_global(addr, bytes);
2361 }
2362 return 0;
2363 }
2364
2365 int err = errno; // save errno from mmap() call in mmap_chunk()
2366
2367 if (!recoverable_mmap_error(err)) {
2368 warn_fail_commit_memory(addr, bytes, exec, err);
2369 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2370 }
2371
2372 return err;
2373 }
2374
2375 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2376 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2377 }
2378
2379 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2380 const char* mesg) {
2381 assert(mesg != NULL, "mesg must be specified");
2382 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2383 if (err != 0) {
2384 // the caller wants all commit errors to exit with the specified mesg:
2385 warn_fail_commit_memory(addr, bytes, exec, err);
2386 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2387 }
2388 }
2389
2390 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2391 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2392 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2393 alignment, (size_t) vm_page_size());
2394
2395 for (int i = 0; _page_sizes[i] != 0; i++) {
2396 if (is_size_aligned(alignment, _page_sizes[i])) {
2397 return _page_sizes[i];
2398 }
2399 }
2400
2401 return (size_t) vm_page_size();
2402 }
2403
2404 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2405 size_t alignment_hint, bool exec) {
2406 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2407 if (err == 0 && UseLargePages && alignment_hint > 0) {
2408 assert(is_size_aligned(bytes, alignment_hint),
2409 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2410
2411 // The syscall memcntl requires an exact page size (see man memcntl for details).
2412 size_t page_size = page_size_for_alignment(alignment_hint);
2413 if (page_size > (size_t) vm_page_size()) {
2414 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2415 }
2416 }
2417 return err;
2418 }
2419
2420 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2421 bool exec) {
2422 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2423 }
2424
2425 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2426 size_t alignment_hint, bool exec,
2427 const char* mesg) {
2428 assert(mesg != NULL, "mesg must be specified");
2429 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2430 if (err != 0) {
2431 // the caller wants all commit errors to exit with the specified mesg:
2432 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2433 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2434 }
2435 }
2436
2437 // Uncommit the pages in a specified region.
2438 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2439 if (madvise(addr, bytes, MADV_FREE) < 0) {
2440 debug_only(warning("MADV_FREE failed."));
2441 return;
2442 }
2443 }
2444
2445 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2446 return os::commit_memory(addr, size, !ExecMem);
2447 }
2448
2449 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2450 return os::uncommit_memory(addr, size);
2451 }
2452
2453 // Change the page size in a given range.
2454 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2455 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2456 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2457 if (UseLargePages) {
2458 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2459 if (page_size > (size_t) vm_page_size()) {
2460 Solaris::setup_large_pages(addr, bytes, page_size);
2461 }
2462 }
2463 }
2464
2465 // Tell the OS to make the range local to the first-touching LWP
2466 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2467 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2468 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2469 debug_only(warning("MADV_ACCESS_LWP failed."));
2470 }
2471 }
2472
2473 // Tell the OS that this range would be accessed from different LWPs.
2474 void os::numa_make_global(char *addr, size_t bytes) {
2475 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2476 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2477 debug_only(warning("MADV_ACCESS_MANY failed."));
2478 }
2479 }
2480
2481 // Get the number of the locality groups.
2482 size_t os::numa_get_groups_num() {
2483 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2484 return n != -1 ? n : 1;
2485 }
2486
2487 // Get a list of leaf locality groups. A leaf lgroup is group that
2488 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2489 // board. An LWP is assigned to one of these groups upon creation.
2490 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2491 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2492 ids[0] = 0;
2493 return 1;
2494 }
2495 int result_size = 0, top = 1, bottom = 0, cur = 0;
2496 for (int k = 0; k < size; k++) {
2497 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2498 (Solaris::lgrp_id_t*)&ids[top], size - top);
2499 if (r == -1) {
2500 ids[0] = 0;
2501 return 1;
2502 }
2503 if (!r) {
2504 // That's a leaf node.
2505 assert(bottom <= cur, "Sanity check");
2506 // Check if the node has memory
2507 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2508 NULL, 0, LGRP_RSRC_MEM) > 0) {
2509 ids[bottom++] = ids[cur];
2510 }
2511 }
2512 top += r;
2513 cur++;
2514 }
2515 if (bottom == 0) {
2516 // Handle a situation, when the OS reports no memory available.
2517 // Assume UMA architecture.
2518 ids[0] = 0;
2519 return 1;
2520 }
2521 return bottom;
2522 }
2523
2524 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2525 bool os::numa_topology_changed() {
2526 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2527 if (is_stale != -1 && is_stale) {
2528 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2529 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2530 assert(c != 0, "Failure to initialize LGRP API");
2531 Solaris::set_lgrp_cookie(c);
2532 return true;
2533 }
2534 return false;
2535 }
2536
2537 // Get the group id of the current LWP.
2538 int os::numa_get_group_id() {
2539 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2540 if (lgrp_id == -1) {
2541 return 0;
2542 }
2543 const int size = os::numa_get_groups_num();
2544 int *ids = (int*)alloca(size * sizeof(int));
2545
2546 // Get the ids of all lgroups with memory; r is the count.
2547 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2548 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2549 if (r <= 0) {
2550 return 0;
2551 }
2552 return ids[os::random() % r];
2553 }
2554
2555 // Request information about the page.
2556 bool os::get_page_info(char *start, page_info* info) {
2557 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2558 uint64_t addr = (uintptr_t)start;
2559 uint64_t outdata[2];
2560 uint_t validity = 0;
2561
2562 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2563 return false;
2564 }
2565
2566 info->size = 0;
2567 info->lgrp_id = -1;
2568
2569 if ((validity & 1) != 0) {
2570 if ((validity & 2) != 0) {
2571 info->lgrp_id = outdata[0];
2572 }
2573 if ((validity & 4) != 0) {
2574 info->size = outdata[1];
2575 }
2576 return true;
2577 }
2578 return false;
2579 }
2580
2581 // Scan the pages from start to end until a page different than
2582 // the one described in the info parameter is encountered.
2583 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2584 page_info* page_found) {
2585 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2586 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2587 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2588 uint_t validity[MAX_MEMINFO_CNT];
2589
2590 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2591 uint64_t p = (uint64_t)start;
2592 while (p < (uint64_t)end) {
2593 addrs[0] = p;
2594 size_t addrs_count = 1;
2595 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2596 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2597 addrs_count++;
2598 }
2599
2600 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2601 return NULL;
2602 }
2603
2604 size_t i = 0;
2605 for (; i < addrs_count; i++) {
2606 if ((validity[i] & 1) != 0) {
2607 if ((validity[i] & 4) != 0) {
2608 if (outdata[types * i + 1] != page_expected->size) {
2609 break;
2610 }
2611 } else if (page_expected->size != 0) {
2612 break;
2613 }
2614
2615 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2616 if (outdata[types * i] != page_expected->lgrp_id) {
2617 break;
2618 }
2619 }
2620 } else {
2621 return NULL;
2622 }
2623 }
2624
2625 if (i < addrs_count) {
2626 if ((validity[i] & 2) != 0) {
2627 page_found->lgrp_id = outdata[types * i];
2628 } else {
2629 page_found->lgrp_id = -1;
2630 }
2631 if ((validity[i] & 4) != 0) {
2632 page_found->size = outdata[types * i + 1];
2633 } else {
2634 page_found->size = 0;
2635 }
2636 return (char*)addrs[i];
2637 }
2638
2639 p = addrs[addrs_count - 1] + page_size;
2640 }
2641 return end;
2642 }
2643
2644 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2645 size_t size = bytes;
2646 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2647 // uncommitted page. Otherwise, the read/write might succeed if we
2648 // have enough swap space to back the physical page.
2649 return
2650 NULL != Solaris::mmap_chunk(addr, size,
2651 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2652 PROT_NONE);
2653 }
2654
2655 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2656 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2657
2658 if (b == MAP_FAILED) {
2659 return NULL;
2660 }
2661 return b;
2662 }
2663
2664 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2665 size_t alignment_hint, bool fixed) {
2666 char* addr = requested_addr;
2667 int flags = MAP_PRIVATE | MAP_NORESERVE;
2668
2669 assert(!(fixed && (alignment_hint > 0)),
2670 "alignment hint meaningless with fixed mmap");
2671
2672 if (fixed) {
2673 flags |= MAP_FIXED;
2674 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2675 flags |= MAP_ALIGN;
2676 addr = (char*) alignment_hint;
2677 }
2678
2679 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2680 // uncommitted page. Otherwise, the read/write might succeed if we
2681 // have enough swap space to back the physical page.
2682 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2683 }
2684
2685 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2686 size_t alignment_hint) {
2687 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2688 (requested_addr != NULL));
2689
2690 guarantee(requested_addr == NULL || requested_addr == addr,
2691 "OS failed to return requested mmap address.");
2692 return addr;
2693 }
2694
2695 // Reserve memory at an arbitrary address, only if that area is
2696 // available (and not reserved for something else).
2697
2698 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2699 const int max_tries = 10;
2700 char* base[max_tries];
2701 size_t size[max_tries];
2702
2703 // Solaris adds a gap between mmap'ed regions. The size of the gap
2704 // is dependent on the requested size and the MMU. Our initial gap
2705 // value here is just a guess and will be corrected later.
2706 bool had_top_overlap = false;
2707 bool have_adjusted_gap = false;
2708 size_t gap = 0x400000;
2709
2710 // Assert only that the size is a multiple of the page size, since
2711 // that's all that mmap requires, and since that's all we really know
2712 // about at this low abstraction level. If we need higher alignment,
2713 // we can either pass an alignment to this method or verify alignment
2714 // in one of the methods further up the call chain. See bug 5044738.
2715 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2716
2717 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2718 // Give it a try, if the kernel honors the hint we can return immediately.
2719 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2720
2721 volatile int err = errno;
2722 if (addr == requested_addr) {
2723 return addr;
2724 } else if (addr != NULL) {
2725 pd_unmap_memory(addr, bytes);
2726 }
2727
2728 if (PrintMiscellaneous && Verbose) {
2729 char buf[256];
2730 buf[0] = '\0';
2731 if (addr == NULL) {
2732 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err));
2733 }
2734 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2735 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2736 "%s", bytes, requested_addr, addr, buf);
2737 }
2738
2739 // Address hint method didn't work. Fall back to the old method.
2740 // In theory, once SNV becomes our oldest supported platform, this
2741 // code will no longer be needed.
2742 //
2743 // Repeatedly allocate blocks until the block is allocated at the
2744 // right spot. Give up after max_tries.
2745 int i;
2746 for (i = 0; i < max_tries; ++i) {
2747 base[i] = reserve_memory(bytes);
2748
2749 if (base[i] != NULL) {
2750 // Is this the block we wanted?
2751 if (base[i] == requested_addr) {
2752 size[i] = bytes;
2753 break;
2754 }
2755
2756 // check that the gap value is right
2757 if (had_top_overlap && !have_adjusted_gap) {
2758 size_t actual_gap = base[i-1] - base[i] - bytes;
2759 if (gap != actual_gap) {
2760 // adjust the gap value and retry the last 2 allocations
2761 assert(i > 0, "gap adjustment code problem");
2762 have_adjusted_gap = true; // adjust the gap only once, just in case
2763 gap = actual_gap;
2764 if (PrintMiscellaneous && Verbose) {
2765 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2766 }
2767 unmap_memory(base[i], bytes);
2768 unmap_memory(base[i-1], size[i-1]);
2769 i-=2;
2770 continue;
2771 }
2772 }
2773
2774 // Does this overlap the block we wanted? Give back the overlapped
2775 // parts and try again.
2776 //
2777 // There is still a bug in this code: if top_overlap == bytes,
2778 // the overlap is offset from requested region by the value of gap.
2779 // In this case giving back the overlapped part will not work,
2780 // because we'll give back the entire block at base[i] and
2781 // therefore the subsequent allocation will not generate a new gap.
2782 // This could be fixed with a new algorithm that used larger
2783 // or variable size chunks to find the requested region -
2784 // but such a change would introduce additional complications.
2785 // It's rare enough that the planets align for this bug,
2786 // so we'll just wait for a fix for 6204603/5003415 which
2787 // will provide a mmap flag to allow us to avoid this business.
2788
2789 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2790 if (top_overlap >= 0 && top_overlap < bytes) {
2791 had_top_overlap = true;
2792 unmap_memory(base[i], top_overlap);
2793 base[i] += top_overlap;
2794 size[i] = bytes - top_overlap;
2795 } else {
2796 size_t bottom_overlap = base[i] + bytes - requested_addr;
2797 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2798 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) {
2799 warning("attempt_reserve_memory_at: possible alignment bug");
2800 }
2801 unmap_memory(requested_addr, bottom_overlap);
2802 size[i] = bytes - bottom_overlap;
2803 } else {
2804 size[i] = bytes;
2805 }
2806 }
2807 }
2808 }
2809
2810 // Give back the unused reserved pieces.
2811
2812 for (int j = 0; j < i; ++j) {
2813 if (base[j] != NULL) {
2814 unmap_memory(base[j], size[j]);
2815 }
2816 }
2817
2818 return (i < max_tries) ? requested_addr : NULL;
2819 }
2820
2821 bool os::pd_release_memory(char* addr, size_t bytes) {
2822 size_t size = bytes;
2823 return munmap(addr, size) == 0;
2824 }
2825
2826 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2827 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2828 "addr must be page aligned");
2829 int retVal = mprotect(addr, bytes, prot);
2830 return retVal == 0;
2831 }
2832
2833 // Protect memory (Used to pass readonly pages through
2834 // JNI GetArray<type>Elements with empty arrays.)
2835 // Also, used for serialization page and for compressed oops null pointer
2836 // checking.
2837 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2838 bool is_committed) {
2839 unsigned int p = 0;
2840 switch (prot) {
2841 case MEM_PROT_NONE: p = PROT_NONE; break;
2842 case MEM_PROT_READ: p = PROT_READ; break;
2843 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2844 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2845 default:
2846 ShouldNotReachHere();
2847 }
2848 // is_committed is unused.
2849 return solaris_mprotect(addr, bytes, p);
2850 }
2851
2852 // guard_memory and unguard_memory only happens within stack guard pages.
2853 // Since ISM pertains only to the heap, guard and unguard memory should not
2854 /// happen with an ISM region.
2855 bool os::guard_memory(char* addr, size_t bytes) {
2856 return solaris_mprotect(addr, bytes, PROT_NONE);
2857 }
2858
2859 bool os::unguard_memory(char* addr, size_t bytes) {
2860 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2861 }
2862
2863 // Large page support
2864 static size_t _large_page_size = 0;
2865
2866 // Insertion sort for small arrays (descending order).
2867 static void insertion_sort_descending(size_t* array, int len) {
2868 for (int i = 0; i < len; i++) {
2869 size_t val = array[i];
2870 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2871 size_t tmp = array[key];
2872 array[key] = array[key - 1];
2873 array[key - 1] = tmp;
2874 }
2875 }
2876 }
2877
2878 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2879 const unsigned int usable_count = VM_Version::page_size_count();
2880 if (usable_count == 1) {
2881 return false;
2882 }
2883
2884 // Find the right getpagesizes interface. When solaris 11 is the minimum
2885 // build platform, getpagesizes() (without the '2') can be called directly.
2886 typedef int (*gps_t)(size_t[], int);
2887 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2888 if (gps_func == NULL) {
2889 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2890 if (gps_func == NULL) {
2891 if (warn) {
2892 warning("MPSS is not supported by the operating system.");
2893 }
2894 return false;
2895 }
2896 }
2897
2898 // Fill the array of page sizes.
2899 int n = (*gps_func)(_page_sizes, page_sizes_max);
2900 assert(n > 0, "Solaris bug?");
2901
2902 if (n == page_sizes_max) {
2903 // Add a sentinel value (necessary only if the array was completely filled
2904 // since it is static (zeroed at initialization)).
2905 _page_sizes[--n] = 0;
2906 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2907 }
2908 assert(_page_sizes[n] == 0, "missing sentinel");
2909 trace_page_sizes("available page sizes", _page_sizes, n);
2910
2911 if (n == 1) return false; // Only one page size available.
2912
2913 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2914 // select up to usable_count elements. First sort the array, find the first
2915 // acceptable value, then copy the usable sizes to the top of the array and
2916 // trim the rest. Make sure to include the default page size :-).
2917 //
2918 // A better policy could get rid of the 4M limit by taking the sizes of the
2919 // important VM memory regions (java heap and possibly the code cache) into
2920 // account.
2921 insertion_sort_descending(_page_sizes, n);
2922 const size_t size_limit =
2923 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2924 int beg;
2925 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2926 const int end = MIN2((int)usable_count, n) - 1;
2927 for (int cur = 0; cur < end; ++cur, ++beg) {
2928 _page_sizes[cur] = _page_sizes[beg];
2929 }
2930 _page_sizes[end] = vm_page_size();
2931 _page_sizes[end + 1] = 0;
2932
2933 if (_page_sizes[end] > _page_sizes[end - 1]) {
2934 // Default page size is not the smallest; sort again.
2935 insertion_sort_descending(_page_sizes, end + 1);
2936 }
2937 *page_size = _page_sizes[0];
2938
2939 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2940 return true;
2941 }
2942
2943 void os::large_page_init() {
2944 if (UseLargePages) {
2945 // print a warning if any large page related flag is specified on command line
2946 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2947 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2948
2949 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2950 }
2951 }
2952
2953 bool os::Solaris::is_valid_page_size(size_t bytes) {
2954 for (int i = 0; _page_sizes[i] != 0; i++) {
2955 if (_page_sizes[i] == bytes) {
2956 return true;
2957 }
2958 }
2959 return false;
2960 }
2961
2962 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2963 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2964 assert(is_ptr_aligned((void*) start, align),
2965 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2966 assert(is_size_aligned(bytes, align),
2967 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2968
2969 // Signal to OS that we want large pages for addresses
2970 // from addr, addr + bytes
2971 struct memcntl_mha mpss_struct;
2972 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2973 mpss_struct.mha_pagesize = align;
2974 mpss_struct.mha_flags = 0;
2975 // Upon successful completion, memcntl() returns 0
2976 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2977 debug_only(warning("Attempt to use MPSS failed."));
2978 return false;
2979 }
2980 return true;
2981 }
2982
2983 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2984 fatal("os::reserve_memory_special should not be called on Solaris.");
2985 return NULL;
2986 }
2987
2988 bool os::release_memory_special(char* base, size_t bytes) {
2989 fatal("os::release_memory_special should not be called on Solaris.");
2990 return false;
2991 }
2992
2993 size_t os::large_page_size() {
2994 return _large_page_size;
2995 }
2996
2997 // MPSS allows application to commit large page memory on demand; with ISM
2998 // the entire memory region must be allocated as shared memory.
2999 bool os::can_commit_large_page_memory() {
3000 return true;
3001 }
3002
3003 bool os::can_execute_large_page_memory() {
3004 return true;
3005 }
3006
3007 // Read calls from inside the vm need to perform state transitions
3008 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3009 size_t res;
3010 JavaThread* thread = (JavaThread*)Thread::current();
3011 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3012 ThreadBlockInVM tbiv(thread);
3013 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3014 return res;
3015 }
3016
3017 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
3018 size_t res;
3019 JavaThread* thread = (JavaThread*)Thread::current();
3020 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3021 ThreadBlockInVM tbiv(thread);
3022 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
3023 return res;
3024 }
3025
3026 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3027 size_t res;
3028 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3029 "Assumed _thread_in_native");
3030 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3031 return res;
3032 }
3033
3034 void os::naked_short_sleep(jlong ms) {
3035 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3036
3037 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3038 // Solaris requires -lrt for this.
3039 usleep((ms * 1000));
3040
3041 return;
3042 }
3043
3044 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3045 void os::infinite_sleep() {
3046 while (true) { // sleep forever ...
3047 ::sleep(100); // ... 100 seconds at a time
3048 }
3049 }
3050
3051 // Used to convert frequent JVM_Yield() to nops
3052 bool os::dont_yield() {
3053 if (DontYieldALot) {
3054 static hrtime_t last_time = 0;
3055 hrtime_t diff = getTimeNanos() - last_time;
3056
3057 if (diff < DontYieldALotInterval * 1000000) {
3058 return true;
3059 }
3060
3061 last_time += diff;
3062
3063 return false;
3064 } else {
3065 return false;
3066 }
3067 }
3068
3069 // Note that yield semantics are defined by the scheduling class to which
3070 // the thread currently belongs. Typically, yield will _not yield to
3071 // other equal or higher priority threads that reside on the dispatch queues
3072 // of other CPUs.
3073
3074 void os::naked_yield() {
3075 thr_yield();
3076 }
3077
3078 // Interface for setting lwp priorities. If we are using T2 libthread,
3079 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3080 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3081 // function is meaningless in this mode so we must adjust the real lwp's priority
3082 // The routines below implement the getting and setting of lwp priorities.
3083 //
3084 // Note: T2 is now the only supported libthread. UseBoundThreads flag is
3085 // being deprecated and all threads are now BoundThreads
3086 //
3087 // Note: There are three priority scales used on Solaris. Java priotities
3088 // which range from 1 to 10, libthread "thr_setprio" scale which range
3089 // from 0 to 127, and the current scheduling class of the process we
3090 // are running in. This is typically from -60 to +60.
3091 // The setting of the lwp priorities in done after a call to thr_setprio
3092 // so Java priorities are mapped to libthread priorities and we map from
3093 // the latter to lwp priorities. We don't keep priorities stored in
3094 // Java priorities since some of our worker threads want to set priorities
3095 // higher than all Java threads.
3096 //
3097 // For related information:
3098 // (1) man -s 2 priocntl
3099 // (2) man -s 4 priocntl
3100 // (3) man dispadmin
3101 // = librt.so
3102 // = libthread/common/rtsched.c - thrp_setlwpprio().
3103 // = ps -cL <pid> ... to validate priority.
3104 // = sched_get_priority_min and _max
3105 // pthread_create
3106 // sched_setparam
3107 // pthread_setschedparam
3108 //
3109 // Assumptions:
3110 // + We assume that all threads in the process belong to the same
3111 // scheduling class. IE. an homogenous process.
3112 // + Must be root or in IA group to change change "interactive" attribute.
3113 // Priocntl() will fail silently. The only indication of failure is when
3114 // we read-back the value and notice that it hasn't changed.
3115 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3116 // + For RT, change timeslice as well. Invariant:
3117 // constant "priority integral"
3118 // Konst == TimeSlice * (60-Priority)
3119 // Given a priority, compute appropriate timeslice.
3120 // + Higher numerical values have higher priority.
3121
3122 // sched class attributes
3123 typedef struct {
3124 int schedPolicy; // classID
3125 int maxPrio;
3126 int minPrio;
3127 } SchedInfo;
3128
3129
3130 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3131
3132 #ifdef ASSERT
3133 static int ReadBackValidate = 1;
3134 #endif
3135 static int myClass = 0;
3136 static int myMin = 0;
3137 static int myMax = 0;
3138 static int myCur = 0;
3139 static bool priocntl_enable = false;
3140
3141 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4
3142 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3143
3144
3145 // lwp_priocntl_init
3146 //
3147 // Try to determine the priority scale for our process.
3148 //
3149 // Return errno or 0 if OK.
3150 //
3151 static int lwp_priocntl_init() {
3152 int rslt;
3153 pcinfo_t ClassInfo;
3154 pcparms_t ParmInfo;
3155 int i;
3156
3157 if (!UseThreadPriorities) return 0;
3158
3159 // If ThreadPriorityPolicy is 1, switch tables
3160 if (ThreadPriorityPolicy == 1) {
3161 for (i = 0; i < CriticalPriority+1; i++)
3162 os::java_to_os_priority[i] = prio_policy1[i];
3163 }
3164 if (UseCriticalJavaThreadPriority) {
3165 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3166 // See set_native_priority() and set_lwp_class_and_priority().
3167 // Save original MaxPriority mapping in case attempt to
3168 // use critical priority fails.
3169 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3170 // Set negative to distinguish from other priorities
3171 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3172 }
3173
3174 // Get IDs for a set of well-known scheduling classes.
3175 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3176 // the system. We should have a loop that iterates over the
3177 // classID values, which are known to be "small" integers.
3178
3179 strcpy(ClassInfo.pc_clname, "TS");
3180 ClassInfo.pc_cid = -1;
3181 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3182 if (rslt < 0) return errno;
3183 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3184 tsLimits.schedPolicy = ClassInfo.pc_cid;
3185 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3186 tsLimits.minPrio = -tsLimits.maxPrio;
3187
3188 strcpy(ClassInfo.pc_clname, "IA");
3189 ClassInfo.pc_cid = -1;
3190 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3191 if (rslt < 0) return errno;
3192 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3193 iaLimits.schedPolicy = ClassInfo.pc_cid;
3194 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3195 iaLimits.minPrio = -iaLimits.maxPrio;
3196
3197 strcpy(ClassInfo.pc_clname, "RT");
3198 ClassInfo.pc_cid = -1;
3199 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3200 if (rslt < 0) return errno;
3201 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3202 rtLimits.schedPolicy = ClassInfo.pc_cid;
3203 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3204 rtLimits.minPrio = 0;
3205
3206 strcpy(ClassInfo.pc_clname, "FX");
3207 ClassInfo.pc_cid = -1;
3208 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3209 if (rslt < 0) return errno;
3210 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3211 fxLimits.schedPolicy = ClassInfo.pc_cid;
3212 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3213 fxLimits.minPrio = 0;
3214
3215 // Query our "current" scheduling class.
3216 // This will normally be IA, TS or, rarely, FX or RT.
3217 memset(&ParmInfo, 0, sizeof(ParmInfo));
3218 ParmInfo.pc_cid = PC_CLNULL;
3219 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3220 if (rslt < 0) return errno;
3221 myClass = ParmInfo.pc_cid;
3222
3223 // We now know our scheduling classId, get specific information
3224 // about the class.
3225 ClassInfo.pc_cid = myClass;
3226 ClassInfo.pc_clname[0] = 0;
3227 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3228 if (rslt < 0) return errno;
3229
3230 if (ThreadPriorityVerbose) {
3231 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3232 }
3233
3234 memset(&ParmInfo, 0, sizeof(pcparms_t));
3235 ParmInfo.pc_cid = PC_CLNULL;
3236 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3237 if (rslt < 0) return errno;
3238
3239 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3240 myMin = rtLimits.minPrio;
3241 myMax = rtLimits.maxPrio;
3242 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3243 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3244 myMin = iaLimits.minPrio;
3245 myMax = iaLimits.maxPrio;
3246 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3247 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3248 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3249 myMin = tsLimits.minPrio;
3250 myMax = tsLimits.maxPrio;
3251 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3252 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3253 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3254 myMin = fxLimits.minPrio;
3255 myMax = fxLimits.maxPrio;
3256 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3257 } else {
3258 // No clue - punt
3259 if (ThreadPriorityVerbose) {
3260 tty->print_cr("Unknown scheduling class: %s ... \n",
3261 ClassInfo.pc_clname);
3262 }
3263 return EINVAL; // no clue, punt
3264 }
3265
3266 if (ThreadPriorityVerbose) {
3267 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3268 }
3269
3270 priocntl_enable = true; // Enable changing priorities
3271 return 0;
3272 }
3273
3274 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3275 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3276 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3277 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3278
3279
3280 // scale_to_lwp_priority
3281 //
3282 // Convert from the libthread "thr_setprio" scale to our current
3283 // lwp scheduling class scale.
3284 //
3285 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3286 int v;
3287
3288 if (x == 127) return rMax; // avoid round-down
3289 v = (((x*(rMax-rMin)))/128)+rMin;
3290 return v;
3291 }
3292
3293
3294 // set_lwp_class_and_priority
3295 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3296 int newPrio, int new_class, bool scale) {
3297 int rslt;
3298 int Actual, Expected, prv;
3299 pcparms_t ParmInfo; // for GET-SET
3300 #ifdef ASSERT
3301 pcparms_t ReadBack; // for readback
3302 #endif
3303
3304 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3305 // Query current values.
3306 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3307 // Cache "pcparms_t" in global ParmCache.
3308 // TODO: elide set-to-same-value
3309
3310 // If something went wrong on init, don't change priorities.
3311 if (!priocntl_enable) {
3312 if (ThreadPriorityVerbose) {
3313 tty->print_cr("Trying to set priority but init failed, ignoring");
3314 }
3315 return EINVAL;
3316 }
3317
3318 // If lwp hasn't started yet, just return
3319 // the _start routine will call us again.
3320 if (lwpid <= 0) {
3321 if (ThreadPriorityVerbose) {
3322 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3323 INTPTR_FORMAT " to %d, lwpid not set",
3324 ThreadID, newPrio);
3325 }
3326 return 0;
3327 }
3328
3329 if (ThreadPriorityVerbose) {
3330 tty->print_cr ("set_lwp_class_and_priority("
3331 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3332 ThreadID, lwpid, newPrio);
3333 }
3334
3335 memset(&ParmInfo, 0, sizeof(pcparms_t));
3336 ParmInfo.pc_cid = PC_CLNULL;
3337 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3338 if (rslt < 0) return errno;
3339
3340 int cur_class = ParmInfo.pc_cid;
3341 ParmInfo.pc_cid = (id_t)new_class;
3342
3343 if (new_class == rtLimits.schedPolicy) {
3344 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3345 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3346 rtLimits.maxPrio, newPrio)
3347 : newPrio;
3348 rtInfo->rt_tqsecs = RT_NOCHANGE;
3349 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3350 if (ThreadPriorityVerbose) {
3351 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3352 }
3353 } else if (new_class == iaLimits.schedPolicy) {
3354 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3355 int maxClamped = MIN2(iaLimits.maxPrio,
3356 cur_class == new_class
3357 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3358 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3359 maxClamped, newPrio)
3360 : newPrio;
3361 iaInfo->ia_uprilim = cur_class == new_class
3362 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3363 iaInfo->ia_mode = IA_NOCHANGE;
3364 if (ThreadPriorityVerbose) {
3365 tty->print_cr("IA: [%d...%d] %d->%d\n",
3366 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3367 }
3368 } else if (new_class == tsLimits.schedPolicy) {
3369 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3370 int maxClamped = MIN2(tsLimits.maxPrio,
3371 cur_class == new_class
3372 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3373 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3374 maxClamped, newPrio)
3375 : newPrio;
3376 tsInfo->ts_uprilim = cur_class == new_class
3377 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3378 if (ThreadPriorityVerbose) {
3379 tty->print_cr("TS: [%d...%d] %d->%d\n",
3380 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3381 }
3382 } else if (new_class == fxLimits.schedPolicy) {
3383 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3384 int maxClamped = MIN2(fxLimits.maxPrio,
3385 cur_class == new_class
3386 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3387 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3388 maxClamped, newPrio)
3389 : newPrio;
3390 fxInfo->fx_uprilim = cur_class == new_class
3391 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3392 fxInfo->fx_tqsecs = FX_NOCHANGE;
3393 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3394 if (ThreadPriorityVerbose) {
3395 tty->print_cr("FX: [%d...%d] %d->%d\n",
3396 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3397 }
3398 } else {
3399 if (ThreadPriorityVerbose) {
3400 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3401 }
3402 return EINVAL; // no clue, punt
3403 }
3404
3405 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3406 if (ThreadPriorityVerbose && rslt) {
3407 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3408 }
3409 if (rslt < 0) return errno;
3410
3411 #ifdef ASSERT
3412 // Sanity check: read back what we just attempted to set.
3413 // In theory it could have changed in the interim ...
3414 //
3415 // The priocntl system call is tricky.
3416 // Sometimes it'll validate the priority value argument and
3417 // return EINVAL if unhappy. At other times it fails silently.
3418 // Readbacks are prudent.
3419
3420 if (!ReadBackValidate) return 0;
3421
3422 memset(&ReadBack, 0, sizeof(pcparms_t));
3423 ReadBack.pc_cid = PC_CLNULL;
3424 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3425 assert(rslt >= 0, "priocntl failed");
3426 Actual = Expected = 0xBAD;
3427 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3428 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3429 Actual = RTPRI(ReadBack)->rt_pri;
3430 Expected = RTPRI(ParmInfo)->rt_pri;
3431 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3432 Actual = IAPRI(ReadBack)->ia_upri;
3433 Expected = IAPRI(ParmInfo)->ia_upri;
3434 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3435 Actual = TSPRI(ReadBack)->ts_upri;
3436 Expected = TSPRI(ParmInfo)->ts_upri;
3437 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3438 Actual = FXPRI(ReadBack)->fx_upri;
3439 Expected = FXPRI(ParmInfo)->fx_upri;
3440 } else {
3441 if (ThreadPriorityVerbose) {
3442 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3443 ParmInfo.pc_cid);
3444 }
3445 }
3446
3447 if (Actual != Expected) {
3448 if (ThreadPriorityVerbose) {
3449 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3450 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3451 }
3452 }
3453 #endif
3454
3455 return 0;
3456 }
3457
3458 // Solaris only gives access to 128 real priorities at a time,
3459 // so we expand Java's ten to fill this range. This would be better
3460 // if we dynamically adjusted relative priorities.
3461 //
3462 // The ThreadPriorityPolicy option allows us to select 2 different
3463 // priority scales.
3464 //
3465 // ThreadPriorityPolicy=0
3466 // Since the Solaris' default priority is MaximumPriority, we do not
3467 // set a priority lower than Max unless a priority lower than
3468 // NormPriority is requested.
3469 //
3470 // ThreadPriorityPolicy=1
3471 // This mode causes the priority table to get filled with
3472 // linear values. NormPriority get's mapped to 50% of the
3473 // Maximum priority an so on. This will cause VM threads
3474 // to get unfair treatment against other Solaris processes
3475 // which do not explicitly alter their thread priorities.
3476
3477 int os::java_to_os_priority[CriticalPriority + 1] = {
3478 -99999, // 0 Entry should never be used
3479
3480 0, // 1 MinPriority
3481 32, // 2
3482 64, // 3
3483
3484 96, // 4
3485 127, // 5 NormPriority
3486 127, // 6
3487
3488 127, // 7
3489 127, // 8
3490 127, // 9 NearMaxPriority
3491
3492 127, // 10 MaxPriority
3493
3494 -criticalPrio // 11 CriticalPriority
3495 };
3496
3497 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3498 OSThread* osthread = thread->osthread();
3499
3500 // Save requested priority in case the thread hasn't been started
3501 osthread->set_native_priority(newpri);
3502
3503 // Check for critical priority request
3504 bool fxcritical = false;
3505 if (newpri == -criticalPrio) {
3506 fxcritical = true;
3507 newpri = criticalPrio;
3508 }
3509
3510 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3511 if (!UseThreadPriorities) return OS_OK;
3512
3513 int status = 0;
3514
3515 if (!fxcritical) {
3516 // Use thr_setprio only if we have a priority that thr_setprio understands
3517 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3518 }
3519
3520 int lwp_status =
3521 set_lwp_class_and_priority(osthread->thread_id(),
3522 osthread->lwp_id(),
3523 newpri,
3524 fxcritical ? fxLimits.schedPolicy : myClass,
3525 !fxcritical);
3526 if (lwp_status != 0 && fxcritical) {
3527 // Try again, this time without changing the scheduling class
3528 newpri = java_MaxPriority_to_os_priority;
3529 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3530 osthread->lwp_id(),
3531 newpri, myClass, false);
3532 }
3533 status |= lwp_status;
3534 return (status == 0) ? OS_OK : OS_ERR;
3535 }
3536
3537
3538 OSReturn os::get_native_priority(const Thread* const thread,
3539 int *priority_ptr) {
3540 int p;
3541 if (!UseThreadPriorities) {
3542 *priority_ptr = NormalPriority;
3543 return OS_OK;
3544 }
3545 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3546 if (status != 0) {
3547 return OS_ERR;
3548 }
3549 *priority_ptr = p;
3550 return OS_OK;
3551 }
3552
3553
3554 // Hint to the underlying OS that a task switch would not be good.
3555 // Void return because it's a hint and can fail.
3556 void os::hint_no_preempt() {
3557 schedctl_start(schedctl_init());
3558 }
3559
3560 static void resume_clear_context(OSThread *osthread) {
3561 osthread->set_ucontext(NULL);
3562 }
3563
3564 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3565 osthread->set_ucontext(context);
3566 }
3567
3568 static PosixSemaphore sr_semaphore;
3569
3570 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3571 // Save and restore errno to avoid confusing native code with EINTR
3572 // after sigsuspend.
3573 int old_errno = errno;
3574
3575 OSThread* osthread = thread->osthread();
3576 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3577
3578 os::SuspendResume::State current = osthread->sr.state();
3579 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3580 suspend_save_context(osthread, uc);
3581
3582 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3583 os::SuspendResume::State state = osthread->sr.suspended();
3584 if (state == os::SuspendResume::SR_SUSPENDED) {
3585 sigset_t suspend_set; // signals for sigsuspend()
3586
3587 // get current set of blocked signals and unblock resume signal
3588 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set);
3589 sigdelset(&suspend_set, os::Solaris::SIGasync());
3590
3591 sr_semaphore.signal();
3592 // wait here until we are resumed
3593 while (1) {
3594 sigsuspend(&suspend_set);
3595
3596 os::SuspendResume::State result = osthread->sr.running();
3597 if (result == os::SuspendResume::SR_RUNNING) {
3598 sr_semaphore.signal();
3599 break;
3600 }
3601 }
3602
3603 } else if (state == os::SuspendResume::SR_RUNNING) {
3604 // request was cancelled, continue
3605 } else {
3606 ShouldNotReachHere();
3607 }
3608
3609 resume_clear_context(osthread);
3610 } else if (current == os::SuspendResume::SR_RUNNING) {
3611 // request was cancelled, continue
3612 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3613 // ignore
3614 } else {
3615 // ignore
3616 }
3617
3618 errno = old_errno;
3619 }
3620
3621 void os::print_statistics() {
3622 }
3623
3624 int os::message_box(const char* title, const char* message) {
3625 int i;
3626 fdStream err(defaultStream::error_fd());
3627 for (i = 0; i < 78; i++) err.print_raw("=");
3628 err.cr();
3629 err.print_raw_cr(title);
3630 for (i = 0; i < 78; i++) err.print_raw("-");
3631 err.cr();
3632 err.print_raw_cr(message);
3633 for (i = 0; i < 78; i++) err.print_raw("=");
3634 err.cr();
3635
3636 char buf[16];
3637 // Prevent process from exiting upon "read error" without consuming all CPU
3638 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3639
3640 return buf[0] == 'y' || buf[0] == 'Y';
3641 }
3642
3643 static int sr_notify(OSThread* osthread) {
3644 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3645 assert_status(status == 0, status, "thr_kill");
3646 return status;
3647 }
3648
3649 // "Randomly" selected value for how long we want to spin
3650 // before bailing out on suspending a thread, also how often
3651 // we send a signal to a thread we want to resume
3652 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3653 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3654
3655 static bool do_suspend(OSThread* osthread) {
3656 assert(osthread->sr.is_running(), "thread should be running");
3657 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3658
3659 // mark as suspended and send signal
3660 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3661 // failed to switch, state wasn't running?
3662 ShouldNotReachHere();
3663 return false;
3664 }
3665
3666 if (sr_notify(osthread) != 0) {
3667 ShouldNotReachHere();
3668 }
3669
3670 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3671 while (true) {
3672 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3673 break;
3674 } else {
3675 // timeout
3676 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3677 if (cancelled == os::SuspendResume::SR_RUNNING) {
3678 return false;
3679 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3680 // make sure that we consume the signal on the semaphore as well
3681 sr_semaphore.wait();
3682 break;
3683 } else {
3684 ShouldNotReachHere();
3685 return false;
3686 }
3687 }
3688 }
3689
3690 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3691 return true;
3692 }
3693
3694 static void do_resume(OSThread* osthread) {
3695 assert(osthread->sr.is_suspended(), "thread should be suspended");
3696 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3697
3698 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3699 // failed to switch to WAKEUP_REQUEST
3700 ShouldNotReachHere();
3701 return;
3702 }
3703
3704 while (true) {
3705 if (sr_notify(osthread) == 0) {
3706 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3707 if (osthread->sr.is_running()) {
3708 return;
3709 }
3710 }
3711 } else {
3712 ShouldNotReachHere();
3713 }
3714 }
3715
3716 guarantee(osthread->sr.is_running(), "Must be running!");
3717 }
3718
3719 void os::SuspendedThreadTask::internal_do_task() {
3720 if (do_suspend(_thread->osthread())) {
3721 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3722 do_task(context);
3723 do_resume(_thread->osthread());
3724 }
3725 }
3726
3727 class PcFetcher : public os::SuspendedThreadTask {
3728 public:
3729 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3730 ExtendedPC result();
3731 protected:
3732 void do_task(const os::SuspendedThreadTaskContext& context);
3733 private:
3734 ExtendedPC _epc;
3735 };
3736
3737 ExtendedPC PcFetcher::result() {
3738 guarantee(is_done(), "task is not done yet.");
3739 return _epc;
3740 }
3741
3742 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3743 Thread* thread = context.thread();
3744 OSThread* osthread = thread->osthread();
3745 if (osthread->ucontext() != NULL) {
3746 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext());
3747 } else {
3748 // NULL context is unexpected, double-check this is the VMThread
3749 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3750 }
3751 }
3752
3753 // A lightweight implementation that does not suspend the target thread and
3754 // thus returns only a hint. Used for profiling only!
3755 ExtendedPC os::get_thread_pc(Thread* thread) {
3756 // Make sure that it is called by the watcher and the Threads lock is owned.
3757 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3758 // For now, is only used to profile the VM Thread
3759 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3760 PcFetcher fetcher(thread);
3761 fetcher.run();
3762 return fetcher.result();
3763 }
3764
3765
3766 // This does not do anything on Solaris. This is basically a hook for being
3767 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3768 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3769 const methodHandle& method, JavaCallArguments* args,
3770 Thread* thread) {
3771 f(value, method, args, thread);
3772 }
3773
3774 // This routine may be used by user applications as a "hook" to catch signals.
3775 // The user-defined signal handler must pass unrecognized signals to this
3776 // routine, and if it returns true (non-zero), then the signal handler must
3777 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3778 // routine will never retun false (zero), but instead will execute a VM panic
3779 // routine kill the process.
3780 //
3781 // If this routine returns false, it is OK to call it again. This allows
3782 // the user-defined signal handler to perform checks either before or after
3783 // the VM performs its own checks. Naturally, the user code would be making
3784 // a serious error if it tried to handle an exception (such as a null check
3785 // or breakpoint) that the VM was generating for its own correct operation.
3786 //
3787 // This routine may recognize any of the following kinds of signals:
3788 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3789 // os::Solaris::SIGasync
3790 // It should be consulted by handlers for any of those signals.
3791 //
3792 // The caller of this routine must pass in the three arguments supplied
3793 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3794 // field of the structure passed to sigaction(). This routine assumes that
3795 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3796 //
3797 // Note that the VM will print warnings if it detects conflicting signal
3798 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3799 //
3800 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3801 siginfo_t* siginfo,
3802 void* ucontext,
3803 int abort_if_unrecognized);
3804
3805
3806 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3807 int orig_errno = errno; // Preserve errno value over signal handler.
3808 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3809 errno = orig_errno;
3810 }
3811
3812 // This boolean allows users to forward their own non-matching signals
3813 // to JVM_handle_solaris_signal, harmlessly.
3814 bool os::Solaris::signal_handlers_are_installed = false;
3815
3816 // For signal-chaining
3817 bool os::Solaris::libjsig_is_loaded = false;
3818 typedef struct sigaction *(*get_signal_t)(int);
3819 get_signal_t os::Solaris::get_signal_action = NULL;
3820
3821 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3822 struct sigaction *actp = NULL;
3823
3824 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3825 // Retrieve the old signal handler from libjsig
3826 actp = (*get_signal_action)(sig);
3827 }
3828 if (actp == NULL) {
3829 // Retrieve the preinstalled signal handler from jvm
3830 actp = get_preinstalled_handler(sig);
3831 }
3832
3833 return actp;
3834 }
3835
3836 static bool call_chained_handler(struct sigaction *actp, int sig,
3837 siginfo_t *siginfo, void *context) {
3838 // Call the old signal handler
3839 if (actp->sa_handler == SIG_DFL) {
3840 // It's more reasonable to let jvm treat it as an unexpected exception
3841 // instead of taking the default action.
3842 return false;
3843 } else if (actp->sa_handler != SIG_IGN) {
3844 if ((actp->sa_flags & SA_NODEFER) == 0) {
3845 // automaticlly block the signal
3846 sigaddset(&(actp->sa_mask), sig);
3847 }
3848
3849 sa_handler_t hand;
3850 sa_sigaction_t sa;
3851 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3852 // retrieve the chained handler
3853 if (siginfo_flag_set) {
3854 sa = actp->sa_sigaction;
3855 } else {
3856 hand = actp->sa_handler;
3857 }
3858
3859 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3860 actp->sa_handler = SIG_DFL;
3861 }
3862
3863 // try to honor the signal mask
3864 sigset_t oset;
3865 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3866
3867 // call into the chained handler
3868 if (siginfo_flag_set) {
3869 (*sa)(sig, siginfo, context);
3870 } else {
3871 (*hand)(sig);
3872 }
3873
3874 // restore the signal mask
3875 thr_sigsetmask(SIG_SETMASK, &oset, 0);
3876 }
3877 // Tell jvm's signal handler the signal is taken care of.
3878 return true;
3879 }
3880
3881 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3882 bool chained = false;
3883 // signal-chaining
3884 if (UseSignalChaining) {
3885 struct sigaction *actp = get_chained_signal_action(sig);
3886 if (actp != NULL) {
3887 chained = call_chained_handler(actp, sig, siginfo, context);
3888 }
3889 }
3890 return chained;
3891 }
3892
3893 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3894 assert((chainedsigactions != (struct sigaction *)NULL) &&
3895 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3896 if (preinstalled_sigs[sig] != 0) {
3897 return &chainedsigactions[sig];
3898 }
3899 return NULL;
3900 }
3901
3902 void os::Solaris::save_preinstalled_handler(int sig,
3903 struct sigaction& oldAct) {
3904 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3905 assert((chainedsigactions != (struct sigaction *)NULL) &&
3906 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3907 chainedsigactions[sig] = oldAct;
3908 preinstalled_sigs[sig] = 1;
3909 }
3910
3911 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3912 bool oktochain) {
3913 // Check for overwrite.
3914 struct sigaction oldAct;
3915 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3916 void* oldhand =
3917 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3918 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3919 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3920 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3921 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3922 if (AllowUserSignalHandlers || !set_installed) {
3923 // Do not overwrite; user takes responsibility to forward to us.
3924 return;
3925 } else if (UseSignalChaining) {
3926 if (oktochain) {
3927 // save the old handler in jvm
3928 save_preinstalled_handler(sig, oldAct);
3929 } else {
3930 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs.");
3931 }
3932 // libjsig also interposes the sigaction() call below and saves the
3933 // old sigaction on it own.
3934 } else {
3935 fatal("Encountered unexpected pre-existing sigaction handler "
3936 "%#lx for signal %d.", (long)oldhand, sig);
3937 }
3938 }
3939
3940 struct sigaction sigAct;
3941 sigfillset(&(sigAct.sa_mask));
3942 sigAct.sa_handler = SIG_DFL;
3943
3944 sigAct.sa_sigaction = signalHandler;
3945 // Handle SIGSEGV on alternate signal stack if
3946 // not using stack banging
3947 if (!UseStackBanging && sig == SIGSEGV) {
3948 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3949 } else {
3950 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3951 }
3952 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3953
3954 sigaction(sig, &sigAct, &oldAct);
3955
3956 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3957 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3958 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3959 }
3960
3961
3962 #define DO_SIGNAL_CHECK(sig) \
3963 do { \
3964 if (!sigismember(&check_signal_done, sig)) { \
3965 os::Solaris::check_signal_handler(sig); \
3966 } \
3967 } while (0)
3968
3969 // This method is a periodic task to check for misbehaving JNI applications
3970 // under CheckJNI, we can add any periodic checks here
3971
3972 void os::run_periodic_checks() {
3973 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3974 // thereby preventing a NULL checks.
3975 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3976
3977 if (check_signals == false) return;
3978
3979 // SEGV and BUS if overridden could potentially prevent
3980 // generation of hs*.log in the event of a crash, debugging
3981 // such a case can be very challenging, so we absolutely
3982 // check for the following for a good measure:
3983 DO_SIGNAL_CHECK(SIGSEGV);
3984 DO_SIGNAL_CHECK(SIGILL);
3985 DO_SIGNAL_CHECK(SIGFPE);
3986 DO_SIGNAL_CHECK(SIGBUS);
3987 DO_SIGNAL_CHECK(SIGPIPE);
3988 DO_SIGNAL_CHECK(SIGXFSZ);
3989
3990 // ReduceSignalUsage allows the user to override these handlers
3991 // see comments at the very top and jvm_solaris.h
3992 if (!ReduceSignalUsage) {
3993 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3994 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3995 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3996 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3997 }
3998
3999 // See comments above for using JVM1/JVM2 and UseAltSigs
4000 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4001
4002 }
4003
4004 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4005
4006 static os_sigaction_t os_sigaction = NULL;
4007
4008 void os::Solaris::check_signal_handler(int sig) {
4009 char buf[O_BUFLEN];
4010 address jvmHandler = NULL;
4011
4012 struct sigaction act;
4013 if (os_sigaction == NULL) {
4014 // only trust the default sigaction, in case it has been interposed
4015 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4016 if (os_sigaction == NULL) return;
4017 }
4018
4019 os_sigaction(sig, (struct sigaction*)NULL, &act);
4020
4021 address thisHandler = (act.sa_flags & SA_SIGINFO)
4022 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4023 : CAST_FROM_FN_PTR(address, act.sa_handler);
4024
4025
4026 switch (sig) {
4027 case SIGSEGV:
4028 case SIGBUS:
4029 case SIGFPE:
4030 case SIGPIPE:
4031 case SIGXFSZ:
4032 case SIGILL:
4033 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4034 break;
4035
4036 case SHUTDOWN1_SIGNAL:
4037 case SHUTDOWN2_SIGNAL:
4038 case SHUTDOWN3_SIGNAL:
4039 case BREAK_SIGNAL:
4040 jvmHandler = (address)user_handler();
4041 break;
4042
4043 default:
4044 int asynsig = os::Solaris::SIGasync();
4045
4046 if (sig == asynsig) {
4047 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4048 } else {
4049 return;
4050 }
4051 break;
4052 }
4053
4054
4055 if (thisHandler != jvmHandler) {
4056 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4057 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4058 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4059 // No need to check this sig any longer
4060 sigaddset(&check_signal_done, sig);
4061 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4062 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4063 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4064 exception_name(sig, buf, O_BUFLEN));
4065 }
4066 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4067 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4068 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig));
4069 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
4070 // No need to check this sig any longer
4071 sigaddset(&check_signal_done, sig);
4072 }
4073
4074 // Print all the signal handler state
4075 if (sigismember(&check_signal_done, sig)) {
4076 print_signal_handlers(tty, buf, O_BUFLEN);
4077 }
4078
4079 }
4080
4081 void os::Solaris::install_signal_handlers() {
4082 bool libjsigdone = false;
4083 signal_handlers_are_installed = true;
4084
4085 // signal-chaining
4086 typedef void (*signal_setting_t)();
4087 signal_setting_t begin_signal_setting = NULL;
4088 signal_setting_t end_signal_setting = NULL;
4089 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4090 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4091 if (begin_signal_setting != NULL) {
4092 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4093 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4094 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4095 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4096 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4097 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4098 libjsig_is_loaded = true;
4099 if (os::Solaris::get_libjsig_version != NULL) {
4100 libjsigversion = (*os::Solaris::get_libjsig_version)();
4101 }
4102 assert(UseSignalChaining, "should enable signal-chaining");
4103 }
4104 if (libjsig_is_loaded) {
4105 // Tell libjsig jvm is setting signal handlers
4106 (*begin_signal_setting)();
4107 }
4108
4109 set_signal_handler(SIGSEGV, true, true);
4110 set_signal_handler(SIGPIPE, true, true);
4111 set_signal_handler(SIGXFSZ, true, true);
4112 set_signal_handler(SIGBUS, true, true);
4113 set_signal_handler(SIGILL, true, true);
4114 set_signal_handler(SIGFPE, true, true);
4115
4116
4117 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4118 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4119 // can not register overridable signals which might be > 32
4120 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4121 // Tell libjsig jvm has finished setting signal handlers
4122 (*end_signal_setting)();
4123 libjsigdone = true;
4124 }
4125 }
4126
4127 set_signal_handler(os::Solaris::SIGasync(), true, true);
4128
4129 if (libjsig_is_loaded && !libjsigdone) {
4130 // Tell libjsig jvm finishes setting signal handlers
4131 (*end_signal_setting)();
4132 }
4133
4134 // We don't activate signal checker if libjsig is in place, we trust ourselves
4135 // and if UserSignalHandler is installed all bets are off.
4136 // Log that signal checking is off only if -verbose:jni is specified.
4137 if (CheckJNICalls) {
4138 if (libjsig_is_loaded) {
4139 if (PrintJNIResolving) {
4140 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4141 }
4142 check_signals = false;
4143 }
4144 if (AllowUserSignalHandlers) {
4145 if (PrintJNIResolving) {
4146 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4147 }
4148 check_signals = false;
4149 }
4150 }
4151 }
4152
4153
4154 void report_error(const char* file_name, int line_no, const char* title,
4155 const char* format, ...);
4156
4157 const char * signames[] = {
4158 "SIG0",
4159 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP",
4160 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS",
4161 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM",
4162 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH",
4163 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT",
4164 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU",
4165 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW",
4166 "SIGCANCEL", "SIGLOST"
4167 };
4168
4169 const char* os::exception_name(int exception_code, char* buf, size_t size) {
4170 if (0 < exception_code && exception_code <= SIGRTMAX) {
4171 // signal
4172 if (exception_code < sizeof(signames)/sizeof(const char*)) {
4173 jio_snprintf(buf, size, "%s", signames[exception_code]);
4174 } else {
4175 jio_snprintf(buf, size, "SIG%d", exception_code);
4176 }
4177 return buf;
4178 } else {
4179 return NULL;
4180 }
4181 }
4182
4183 // (Static) wrapper for getisax(2) call.
4184 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4185
4186 // (Static) wrappers for the liblgrp API
4187 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4188 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4189 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4190 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4191 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4192 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4193 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4194 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4195 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4196
4197 // (Static) wrapper for meminfo() call.
4198 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4199
4200 static address resolve_symbol_lazy(const char* name) {
4201 address addr = (address) dlsym(RTLD_DEFAULT, name);
4202 if (addr == NULL) {
4203 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4204 addr = (address) dlsym(RTLD_NEXT, name);
4205 }
4206 return addr;
4207 }
4208
4209 static address resolve_symbol(const char* name) {
4210 address addr = resolve_symbol_lazy(name);
4211 if (addr == NULL) {
4212 fatal(dlerror());
4213 }
4214 return addr;
4215 }
4216
4217 void os::Solaris::libthread_init() {
4218 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4219
4220 lwp_priocntl_init();
4221
4222 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4223 if (func == NULL) {
4224 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4225 // Guarantee that this VM is running on an new enough OS (5.6 or
4226 // later) that it will have a new enough libthread.so.
4227 guarantee(func != NULL, "libthread.so is too old.");
4228 }
4229
4230 int size;
4231 void (*handler_info_func)(address *, int *);
4232 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4233 handler_info_func(&handler_start, &size);
4234 handler_end = handler_start + size;
4235 }
4236
4237
4238 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4239 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4240 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4241 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4242 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4243 int os::Solaris::_mutex_scope = USYNC_THREAD;
4244
4245 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4246 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4247 int_fnP_cond_tP os::Solaris::_cond_signal;
4248 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4249 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4250 int_fnP_cond_tP os::Solaris::_cond_destroy;
4251 int os::Solaris::_cond_scope = USYNC_THREAD;
4252
4253 void os::Solaris::synchronization_init() {
4254 if (UseLWPSynchronization) {
4255 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4256 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4257 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4258 os::Solaris::set_mutex_init(lwp_mutex_init);
4259 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4260 os::Solaris::set_mutex_scope(USYNC_THREAD);
4261
4262 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4263 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4264 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4265 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4266 os::Solaris::set_cond_init(lwp_cond_init);
4267 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4268 os::Solaris::set_cond_scope(USYNC_THREAD);
4269 } else {
4270 os::Solaris::set_mutex_scope(USYNC_THREAD);
4271 os::Solaris::set_cond_scope(USYNC_THREAD);
4272
4273 if (UsePthreads) {
4274 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4275 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4276 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4277 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4278 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4279
4280 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4281 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4282 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4283 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4284 os::Solaris::set_cond_init(pthread_cond_default_init);
4285 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4286 } else {
4287 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4288 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4289 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4290 os::Solaris::set_mutex_init(::mutex_init);
4291 os::Solaris::set_mutex_destroy(::mutex_destroy);
4292
4293 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4294 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4295 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4296 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4297 os::Solaris::set_cond_init(::cond_init);
4298 os::Solaris::set_cond_destroy(::cond_destroy);
4299 }
4300 }
4301 }
4302
4303 bool os::Solaris::liblgrp_init() {
4304 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4305 if (handle != NULL) {
4306 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4307 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4308 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4309 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4310 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4311 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4312 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4313 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4314 dlsym(handle, "lgrp_cookie_stale")));
4315
4316 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4317 set_lgrp_cookie(c);
4318 return true;
4319 }
4320 return false;
4321 }
4322
4323 void os::Solaris::misc_sym_init() {
4324 address func;
4325
4326 // getisax
4327 func = resolve_symbol_lazy("getisax");
4328 if (func != NULL) {
4329 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4330 }
4331
4332 // meminfo
4333 func = resolve_symbol_lazy("meminfo");
4334 if (func != NULL) {
4335 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4336 }
4337 }
4338
4339 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4340 assert(_getisax != NULL, "_getisax not set");
4341 return _getisax(array, n);
4342 }
4343
4344 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4345 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4346 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4347
4348 void init_pset_getloadavg_ptr(void) {
4349 pset_getloadavg_ptr =
4350 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4351 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) {
4352 warning("pset_getloadavg function not found");
4353 }
4354 }
4355
4356 int os::Solaris::_dev_zero_fd = -1;
4357
4358 // this is called _before_ the global arguments have been parsed
4359 void os::init(void) {
4360 _initial_pid = getpid();
4361
4362 max_hrtime = first_hrtime = gethrtime();
4363
4364 init_random(1234567);
4365
4366 page_size = sysconf(_SC_PAGESIZE);
4367 if (page_size == -1) {
4368 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno));
4369 }
4370 init_page_sizes((size_t) page_size);
4371
4372 Solaris::initialize_system_info();
4373
4374 // Initialize misc. symbols as soon as possible, so we can use them
4375 // if we need them.
4376 Solaris::misc_sym_init();
4377
4378 int fd = ::open("/dev/zero", O_RDWR);
4379 if (fd < 0) {
4380 fatal("os::init: cannot open /dev/zero (%s)", strerror(errno));
4381 } else {
4382 Solaris::set_dev_zero_fd(fd);
4383
4384 // Close on exec, child won't inherit.
4385 fcntl(fd, F_SETFD, FD_CLOEXEC);
4386 }
4387
4388 clock_tics_per_sec = CLK_TCK;
4389
4390 // check if dladdr1() exists; dladdr1 can provide more information than
4391 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4392 // and is available on linker patches for 5.7 and 5.8.
4393 // libdl.so must have been loaded, this call is just an entry lookup
4394 void * hdl = dlopen("libdl.so", RTLD_NOW);
4395 if (hdl) {
4396 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4397 }
4398
4399 // (Solaris only) this switches to calls that actually do locking.
4400 ThreadCritical::initialize();
4401
4402 main_thread = thr_self();
4403
4404 // Constant minimum stack size allowed. It must be at least
4405 // the minimum of what the OS supports (thr_min_stack()), and
4406 // enough to allow the thread to get to user bytecode execution.
4407 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4408 // If the pagesize of the VM is greater than 8K determine the appropriate
4409 // number of initial guard pages. The user can change this with the
4410 // command line arguments, if needed.
4411 if (vm_page_size() > 8*K) {
4412 StackYellowPages = 1;
4413 StackRedPages = 1;
4414 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size();
4415 }
4416 }
4417
4418 // To install functions for atexit system call
4419 extern "C" {
4420 static void perfMemory_exit_helper() {
4421 perfMemory_exit();
4422 }
4423 }
4424
4425 // this is called _after_ the global arguments have been parsed
4426 jint os::init_2(void) {
4427 // try to enable extended file IO ASAP, see 6431278
4428 os::Solaris::try_enable_extended_io();
4429
4430 // Allocate a single page and mark it as readable for safepoint polling. Also
4431 // use this first mmap call to check support for MAP_ALIGN.
4432 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4433 page_size,
4434 MAP_PRIVATE | MAP_ALIGN,
4435 PROT_READ);
4436 if (polling_page == NULL) {
4437 has_map_align = false;
4438 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4439 PROT_READ);
4440 }
4441
4442 os::set_polling_page(polling_page);
4443
4444 #ifndef PRODUCT
4445 if (Verbose && PrintMiscellaneous) {
4446 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n",
4447 (intptr_t)polling_page);
4448 }
4449 #endif
4450
4451 if (!UseMembar) {
4452 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4453 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4454 os::set_memory_serialize_page(mem_serialize_page);
4455
4456 #ifndef PRODUCT
4457 if (Verbose && PrintMiscellaneous) {
4458 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n",
4459 (intptr_t)mem_serialize_page);
4460 }
4461 #endif
4462 }
4463
4464 // Check minimum allowable stack size for thread creation and to initialize
4465 // the java system classes, including StackOverflowError - depends on page
4466 // size. Add a page for compiler2 recursion in main thread.
4467 // Add in 2*BytesPerWord times page size to account for VM stack during
4468 // class initialization depending on 32 or 64 bit VM.
4469 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4470 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+
4471 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4472
4473 size_t threadStackSizeInBytes = ThreadStackSize * K;
4474 if (threadStackSizeInBytes != 0 &&
4475 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4476 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4477 os::Solaris::min_stack_allowed/K);
4478 return JNI_ERR;
4479 }
4480
4481 // For 64kbps there will be a 64kb page size, which makes
4482 // the usable default stack size quite a bit less. Increase the
4483 // stack for 64kb (or any > than 8kb) pages, this increases
4484 // virtual memory fragmentation (since we're not creating the
4485 // stack on a power of 2 boundary. The real fix for this
4486 // should be to fix the guard page mechanism.
4487
4488 if (vm_page_size() > 8*K) {
4489 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4490 ? threadStackSizeInBytes +
4491 ((StackYellowPages + StackRedPages) * vm_page_size())
4492 : 0;
4493 ThreadStackSize = threadStackSizeInBytes/K;
4494 }
4495
4496 // Make the stack size a multiple of the page size so that
4497 // the yellow/red zones can be guarded.
4498 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4499 vm_page_size()));
4500
4501 Solaris::libthread_init();
4502
4503 if (UseNUMA) {
4504 if (!Solaris::liblgrp_init()) {
4505 UseNUMA = false;
4506 } else {
4507 size_t lgrp_limit = os::numa_get_groups_num();
4508 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4509 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4510 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4511 if (lgrp_num < 2) {
4512 // There's only one locality group, disable NUMA.
4513 UseNUMA = false;
4514 }
4515 }
4516 if (!UseNUMA && ForceNUMA) {
4517 UseNUMA = true;
4518 }
4519 }
4520
4521 Solaris::signal_sets_init();
4522 Solaris::init_signal_mem();
4523 Solaris::install_signal_handlers();
4524
4525 if (libjsigversion < JSIG_VERSION_1_4_1) {
4526 Maxlibjsigsigs = OLDMAXSIGNUM;
4527 }
4528
4529 // initialize synchronization primitives to use either thread or
4530 // lwp synchronization (controlled by UseLWPSynchronization)
4531 Solaris::synchronization_init();
4532
4533 if (MaxFDLimit) {
4534 // set the number of file descriptors to max. print out error
4535 // if getrlimit/setrlimit fails but continue regardless.
4536 struct rlimit nbr_files;
4537 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4538 if (status != 0) {
4539 if (PrintMiscellaneous && (Verbose || WizardMode)) {
4540 perror("os::init_2 getrlimit failed");
4541 }
4542 } else {
4543 nbr_files.rlim_cur = nbr_files.rlim_max;
4544 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4545 if (status != 0) {
4546 if (PrintMiscellaneous && (Verbose || WizardMode)) {
4547 perror("os::init_2 setrlimit failed");
4548 }
4549 }
4550 }
4551 }
4552
4553 // Calculate theoretical max. size of Threads to guard gainst
4554 // artifical out-of-memory situations, where all available address-
4555 // space has been reserved by thread stacks. Default stack size is 1Mb.
4556 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4557 JavaThread::stack_size_at_create() : (1*K*K);
4558 assert(pre_thread_stack_size != 0, "Must have a stack");
4559 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4560 // we should start doing Virtual Memory banging. Currently when the threads will
4561 // have used all but 200Mb of space.
4562 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4563 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4564
4565 // at-exit methods are called in the reverse order of their registration.
4566 // In Solaris 7 and earlier, atexit functions are called on return from
4567 // main or as a result of a call to exit(3C). There can be only 32 of
4568 // these functions registered and atexit() does not set errno. In Solaris
4569 // 8 and later, there is no limit to the number of functions registered
4570 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4571 // functions are called upon dlclose(3DL) in addition to return from main
4572 // and exit(3C).
4573
4574 if (PerfAllowAtExitRegistration) {
4575 // only register atexit functions if PerfAllowAtExitRegistration is set.
4576 // atexit functions can be delayed until process exit time, which
4577 // can be problematic for embedded VM situations. Embedded VMs should
4578 // call DestroyJavaVM() to assure that VM resources are released.
4579
4580 // note: perfMemory_exit_helper atexit function may be removed in
4581 // the future if the appropriate cleanup code can be added to the
4582 // VM_Exit VMOperation's doit method.
4583 if (atexit(perfMemory_exit_helper) != 0) {
4584 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4585 }
4586 }
4587
4588 // Init pset_loadavg function pointer
4589 init_pset_getloadavg_ptr();
4590
4591 return JNI_OK;
4592 }
4593
4594 // Mark the polling page as unreadable
4595 void os::make_polling_page_unreadable(void) {
4596 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4597 fatal("Could not disable polling page");
4598 }
4599 }
4600
4601 // Mark the polling page as readable
4602 void os::make_polling_page_readable(void) {
4603 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4604 fatal("Could not enable polling page");
4605 }
4606 }
4607
4608 // OS interface.
4609
4610 bool os::check_heap(bool force) { return true; }
4611
4612 // Is a (classpath) directory empty?
4613 bool os::dir_is_empty(const char* path) {
4614 DIR *dir = NULL;
4615 struct dirent *ptr;
4616
4617 dir = opendir(path);
4618 if (dir == NULL) return true;
4619
4620 // Scan the directory
4621 bool result = true;
4622 char buf[sizeof(struct dirent) + MAX_PATH];
4623 struct dirent *dbuf = (struct dirent *) buf;
4624 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4625 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4626 result = false;
4627 }
4628 }
4629 closedir(dir);
4630 return result;
4631 }
4632
4633 // This code originates from JDK's sysOpen and open64_w
4634 // from src/solaris/hpi/src/system_md.c
4635
4636 int os::open(const char *path, int oflag, int mode) {
4637 if (strlen(path) > MAX_PATH - 1) {
4638 errno = ENAMETOOLONG;
4639 return -1;
4640 }
4641 int fd;
4642
4643 fd = ::open64(path, oflag, mode);
4644 if (fd == -1) return -1;
4645
4646 // If the open succeeded, the file might still be a directory
4647 {
4648 struct stat64 buf64;
4649 int ret = ::fstat64(fd, &buf64);
4650 int st_mode = buf64.st_mode;
4651
4652 if (ret != -1) {
4653 if ((st_mode & S_IFMT) == S_IFDIR) {
4654 errno = EISDIR;
4655 ::close(fd);
4656 return -1;
4657 }
4658 } else {
4659 ::close(fd);
4660 return -1;
4661 }
4662 }
4663
4664 // 32-bit Solaris systems suffer from:
4665 //
4666 // - an historical default soft limit of 256 per-process file
4667 // descriptors that is too low for many Java programs.
4668 //
4669 // - a design flaw where file descriptors created using stdio
4670 // fopen must be less than 256, _even_ when the first limit above
4671 // has been raised. This can cause calls to fopen (but not calls to
4672 // open, for example) to fail mysteriously, perhaps in 3rd party
4673 // native code (although the JDK itself uses fopen). One can hardly
4674 // criticize them for using this most standard of all functions.
4675 //
4676 // We attempt to make everything work anyways by:
4677 //
4678 // - raising the soft limit on per-process file descriptors beyond
4679 // 256
4680 //
4681 // - As of Solaris 10u4, we can request that Solaris raise the 256
4682 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4683 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4684 //
4685 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4686 // workaround the bug by remapping non-stdio file descriptors below
4687 // 256 to ones beyond 256, which is done below.
4688 //
4689 // See:
4690 // 1085341: 32-bit stdio routines should support file descriptors >255
4691 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4692 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4693 // enable_extended_FILE_stdio() in VM initialisation
4694 // Giri Mandalika's blog
4695 // http://technopark02.blogspot.com/2005_05_01_archive.html
4696 //
4697 #ifndef _LP64
4698 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4699 int newfd = ::fcntl(fd, F_DUPFD, 256);
4700 if (newfd != -1) {
4701 ::close(fd);
4702 fd = newfd;
4703 }
4704 }
4705 #endif // 32-bit Solaris
4706
4707 // All file descriptors that are opened in the JVM and not
4708 // specifically destined for a subprocess should have the
4709 // close-on-exec flag set. If we don't set it, then careless 3rd
4710 // party native code might fork and exec without closing all
4711 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4712 // UNIXProcess.c), and this in turn might:
4713 //
4714 // - cause end-of-file to fail to be detected on some file
4715 // descriptors, resulting in mysterious hangs, or
4716 //
4717 // - might cause an fopen in the subprocess to fail on a system
4718 // suffering from bug 1085341.
4719 //
4720 // (Yes, the default setting of the close-on-exec flag is a Unix
4721 // design flaw)
4722 //
4723 // See:
4724 // 1085341: 32-bit stdio routines should support file descriptors >255
4725 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4726 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4727 //
4728 #ifdef FD_CLOEXEC
4729 {
4730 int flags = ::fcntl(fd, F_GETFD);
4731 if (flags != -1) {
4732 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4733 }
4734 }
4735 #endif
4736
4737 return fd;
4738 }
4739
4740 // create binary file, rewriting existing file if required
4741 int os::create_binary_file(const char* path, bool rewrite_existing) {
4742 int oflags = O_WRONLY | O_CREAT;
4743 if (!rewrite_existing) {
4744 oflags |= O_EXCL;
4745 }
4746 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4747 }
4748
4749 // return current position of file pointer
4750 jlong os::current_file_offset(int fd) {
4751 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4752 }
4753
4754 // move file pointer to the specified offset
4755 jlong os::seek_to_file_offset(int fd, jlong offset) {
4756 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4757 }
4758
4759 jlong os::lseek(int fd, jlong offset, int whence) {
4760 return (jlong) ::lseek64(fd, offset, whence);
4761 }
4762
4763 char * os::native_path(char *path) {
4764 return path;
4765 }
4766
4767 int os::ftruncate(int fd, jlong length) {
4768 return ::ftruncate64(fd, length);
4769 }
4770
4771 int os::fsync(int fd) {
4772 RESTARTABLE_RETURN_INT(::fsync(fd));
4773 }
4774
4775 int os::available(int fd, jlong *bytes) {
4776 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4777 "Assumed _thread_in_native");
4778 jlong cur, end;
4779 int mode;
4780 struct stat64 buf64;
4781
4782 if (::fstat64(fd, &buf64) >= 0) {
4783 mode = buf64.st_mode;
4784 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4785 int n,ioctl_return;
4786
4787 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4788 if (ioctl_return>= 0) {
4789 *bytes = n;
4790 return 1;
4791 }
4792 }
4793 }
4794 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4795 return 0;
4796 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4797 return 0;
4798 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4799 return 0;
4800 }
4801 *bytes = end - cur;
4802 return 1;
4803 }
4804
4805 // Map a block of memory.
4806 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4807 char *addr, size_t bytes, bool read_only,
4808 bool allow_exec) {
4809 int prot;
4810 int flags;
4811
4812 if (read_only) {
4813 prot = PROT_READ;
4814 flags = MAP_SHARED;
4815 } else {
4816 prot = PROT_READ | PROT_WRITE;
4817 flags = MAP_PRIVATE;
4818 }
4819
4820 if (allow_exec) {
4821 prot |= PROT_EXEC;
4822 }
4823
4824 if (addr != NULL) {
4825 flags |= MAP_FIXED;
4826 }
4827
4828 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4829 fd, file_offset);
4830 if (mapped_address == MAP_FAILED) {
4831 return NULL;
4832 }
4833 return mapped_address;
4834 }
4835
4836
4837 // Remap a block of memory.
4838 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4839 char *addr, size_t bytes, bool read_only,
4840 bool allow_exec) {
4841 // same as map_memory() on this OS
4842 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4843 allow_exec);
4844 }
4845
4846
4847 // Unmap a block of memory.
4848 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4849 return munmap(addr, bytes) == 0;
4850 }
4851
4852 void os::pause() {
4853 char filename[MAX_PATH];
4854 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4855 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4856 } else {
4857 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4858 }
4859
4860 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4861 if (fd != -1) {
4862 struct stat buf;
4863 ::close(fd);
4864 while (::stat(filename, &buf) == 0) {
4865 (void)::poll(NULL, 0, 100);
4866 }
4867 } else {
4868 jio_fprintf(stderr,
4869 "Could not open pause file '%s', continuing immediately.\n", filename);
4870 }
4871 }
4872
4873 #ifndef PRODUCT
4874 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4875 // Turn this on if you need to trace synch operations.
4876 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4877 // and call record_synch_enable and record_synch_disable
4878 // around the computation of interest.
4879
4880 void record_synch(char* name, bool returning); // defined below
4881
4882 class RecordSynch {
4883 char* _name;
4884 public:
4885 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4886 ~RecordSynch() { record_synch(_name, true); }
4887 };
4888
4889 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4890 extern "C" ret name params { \
4891 typedef ret name##_t params; \
4892 static name##_t* implem = NULL; \
4893 static int callcount = 0; \
4894 if (implem == NULL) { \
4895 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4896 if (implem == NULL) fatal(dlerror()); \
4897 } \
4898 ++callcount; \
4899 RecordSynch _rs(#name); \
4900 inner; \
4901 return implem args; \
4902 }
4903 // in dbx, examine callcounts this way:
4904 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4905
4906 #define CHECK_POINTER_OK(p) \
4907 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4908 #define CHECK_MU \
4909 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4910 #define CHECK_CV \
4911 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4912 #define CHECK_P(p) \
4913 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4914
4915 #define CHECK_MUTEX(mutex_op) \
4916 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4917
4918 CHECK_MUTEX( mutex_lock)
4919 CHECK_MUTEX( _mutex_lock)
4920 CHECK_MUTEX( mutex_unlock)
4921 CHECK_MUTEX(_mutex_unlock)
4922 CHECK_MUTEX( mutex_trylock)
4923 CHECK_MUTEX(_mutex_trylock)
4924
4925 #define CHECK_COND(cond_op) \
4926 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4927
4928 CHECK_COND( cond_wait);
4929 CHECK_COND(_cond_wait);
4930 CHECK_COND(_cond_wait_cancel);
4931
4932 #define CHECK_COND2(cond_op) \
4933 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4934
4935 CHECK_COND2( cond_timedwait);
4936 CHECK_COND2(_cond_timedwait);
4937 CHECK_COND2(_cond_timedwait_cancel);
4938
4939 // do the _lwp_* versions too
4940 #define mutex_t lwp_mutex_t
4941 #define cond_t lwp_cond_t
4942 CHECK_MUTEX( _lwp_mutex_lock)
4943 CHECK_MUTEX( _lwp_mutex_unlock)
4944 CHECK_MUTEX( _lwp_mutex_trylock)
4945 CHECK_MUTEX( __lwp_mutex_lock)
4946 CHECK_MUTEX( __lwp_mutex_unlock)
4947 CHECK_MUTEX( __lwp_mutex_trylock)
4948 CHECK_MUTEX(___lwp_mutex_lock)
4949 CHECK_MUTEX(___lwp_mutex_unlock)
4950
4951 CHECK_COND( _lwp_cond_wait);
4952 CHECK_COND( __lwp_cond_wait);
4953 CHECK_COND(___lwp_cond_wait);
4954
4955 CHECK_COND2( _lwp_cond_timedwait);
4956 CHECK_COND2( __lwp_cond_timedwait);
4957 #undef mutex_t
4958 #undef cond_t
4959
4960 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4961 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4962 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4963 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4964 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4965 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4966 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4967 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4968
4969
4970 // recording machinery:
4971
4972 enum { RECORD_SYNCH_LIMIT = 200 };
4973 char* record_synch_name[RECORD_SYNCH_LIMIT];
4974 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4975 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4976 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4977 int record_synch_count = 0;
4978 bool record_synch_enabled = false;
4979
4980 // in dbx, examine recorded data this way:
4981 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4982
4983 void record_synch(char* name, bool returning) {
4984 if (record_synch_enabled) {
4985 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4986 record_synch_name[record_synch_count] = name;
4987 record_synch_returning[record_synch_count] = returning;
4988 record_synch_thread[record_synch_count] = thr_self();
4989 record_synch_arg0ptr[record_synch_count] = &name;
4990 record_synch_count++;
4991 }
4992 // put more checking code here:
4993 // ...
4994 }
4995 }
4996
4997 void record_synch_enable() {
4998 // start collecting trace data, if not already doing so
4999 if (!record_synch_enabled) record_synch_count = 0;
5000 record_synch_enabled = true;
5001 }
5002
5003 void record_synch_disable() {
5004 // stop collecting trace data
5005 record_synch_enabled = false;
5006 }
5007
5008 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5009 #endif // PRODUCT
5010
5011 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5012 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5013 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5014
5015
5016 // JVMTI & JVM monitoring and management support
5017 // The thread_cpu_time() and current_thread_cpu_time() are only
5018 // supported if is_thread_cpu_time_supported() returns true.
5019 // They are not supported on Solaris T1.
5020
5021 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5022 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5023 // of a thread.
5024 //
5025 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5026 // returns the fast estimate available on the platform.
5027
5028 // hrtime_t gethrvtime() return value includes
5029 // user time but does not include system time
5030 jlong os::current_thread_cpu_time() {
5031 return (jlong) gethrvtime();
5032 }
5033
5034 jlong os::thread_cpu_time(Thread *thread) {
5035 // return user level CPU time only to be consistent with
5036 // what current_thread_cpu_time returns.
5037 // thread_cpu_time_info() must be changed if this changes
5038 return os::thread_cpu_time(thread, false /* user time only */);
5039 }
5040
5041 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5042 if (user_sys_cpu_time) {
5043 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5044 } else {
5045 return os::current_thread_cpu_time();
5046 }
5047 }
5048
5049 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5050 char proc_name[64];
5051 int count;
5052 prusage_t prusage;
5053 jlong lwp_time;
5054 int fd;
5055
5056 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5057 getpid(),
5058 thread->osthread()->lwp_id());
5059 fd = ::open(proc_name, O_RDONLY);
5060 if (fd == -1) return -1;
5061
5062 do {
5063 count = ::pread(fd,
5064 (void *)&prusage.pr_utime,
5065 thr_time_size,
5066 thr_time_off);
5067 } while (count < 0 && errno == EINTR);
5068 ::close(fd);
5069 if (count < 0) return -1;
5070
5071 if (user_sys_cpu_time) {
5072 // user + system CPU time
5073 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5074 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5075 (jlong)prusage.pr_stime.tv_nsec +
5076 (jlong)prusage.pr_utime.tv_nsec;
5077 } else {
5078 // user level CPU time only
5079 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5080 (jlong)prusage.pr_utime.tv_nsec;
5081 }
5082
5083 return (lwp_time);
5084 }
5085
5086 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5087 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5088 info_ptr->may_skip_backward = false; // elapsed time not wall time
5089 info_ptr->may_skip_forward = false; // elapsed time not wall time
5090 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5091 }
5092
5093 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5094 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5095 info_ptr->may_skip_backward = false; // elapsed time not wall time
5096 info_ptr->may_skip_forward = false; // elapsed time not wall time
5097 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5098 }
5099
5100 bool os::is_thread_cpu_time_supported() {
5101 return true;
5102 }
5103
5104 // System loadavg support. Returns -1 if load average cannot be obtained.
5105 // Return the load average for our processor set if the primitive exists
5106 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5107 int os::loadavg(double loadavg[], int nelem) {
5108 if (pset_getloadavg_ptr != NULL) {
5109 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5110 } else {
5111 return ::getloadavg(loadavg, nelem);
5112 }
5113 }
5114
5115 //---------------------------------------------------------------------------------
5116
5117 bool os::find(address addr, outputStream* st) {
5118 Dl_info dlinfo;
5119 memset(&dlinfo, 0, sizeof(dlinfo));
5120 if (dladdr(addr, &dlinfo) != 0) {
5121 st->print(PTR_FORMAT ": ", addr);
5122 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5123 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5124 } else if (dlinfo.dli_fbase != NULL) {
5125 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5126 } else {
5127 st->print("<absolute address>");
5128 }
5129 if (dlinfo.dli_fname != NULL) {
5130 st->print(" in %s", dlinfo.dli_fname);
5131 }
5132 if (dlinfo.dli_fbase != NULL) {
5133 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5134 }
5135 st->cr();
5136
5137 if (Verbose) {
5138 // decode some bytes around the PC
5139 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5140 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5141 address lowest = (address) dlinfo.dli_sname;
5142 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5143 if (begin < lowest) begin = lowest;
5144 Dl_info dlinfo2;
5145 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5146 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
5147 end = (address) dlinfo2.dli_saddr;
5148 }
5149 Disassembler::decode(begin, end, st);
5150 }
5151 return true;
5152 }
5153 return false;
5154 }
5155
5156 // Following function has been added to support HotSparc's libjvm.so running
5157 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5158 // src/solaris/hpi/native_threads in the EVM codebase.
5159 //
5160 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5161 // libraries and should thus be removed. We will leave it behind for a while
5162 // until we no longer want to able to run on top of 1.3.0 Solaris production
5163 // JDK. See 4341971.
5164
5165 #define STACK_SLACK 0x800
5166
5167 extern "C" {
5168 intptr_t sysThreadAvailableStackWithSlack() {
5169 stack_t st;
5170 intptr_t retval, stack_top;
5171 retval = thr_stksegment(&st);
5172 assert(retval == 0, "incorrect return value from thr_stksegment");
5173 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5174 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5175 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5176 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5177 }
5178 }
5179
5180 // ObjectMonitor park-unpark infrastructure ...
5181 //
5182 // We implement Solaris and Linux PlatformEvents with the
5183 // obvious condvar-mutex-flag triple.
5184 // Another alternative that works quite well is pipes:
5185 // Each PlatformEvent consists of a pipe-pair.
5186 // The thread associated with the PlatformEvent
5187 // calls park(), which reads from the input end of the pipe.
5188 // Unpark() writes into the other end of the pipe.
5189 // The write-side of the pipe must be set NDELAY.
5190 // Unfortunately pipes consume a large # of handles.
5191 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5192 // Using pipes for the 1st few threads might be workable, however.
5193 //
5194 // park() is permitted to return spuriously.
5195 // Callers of park() should wrap the call to park() in
5196 // an appropriate loop. A litmus test for the correct
5197 // usage of park is the following: if park() were modified
5198 // to immediately return 0 your code should still work,
5199 // albeit degenerating to a spin loop.
5200 //
5201 // In a sense, park()-unpark() just provides more polite spinning
5202 // and polling with the key difference over naive spinning being
5203 // that a parked thread needs to be explicitly unparked() in order
5204 // to wake up and to poll the underlying condition.
5205 //
5206 // Assumption:
5207 // Only one parker can exist on an event, which is why we allocate
5208 // them per-thread. Multiple unparkers can coexist.
5209 //
5210 // _Event transitions in park()
5211 // -1 => -1 : illegal
5212 // 1 => 0 : pass - return immediately
5213 // 0 => -1 : block; then set _Event to 0 before returning
5214 //
5215 // _Event transitions in unpark()
5216 // 0 => 1 : just return
5217 // 1 => 1 : just return
5218 // -1 => either 0 or 1; must signal target thread
5219 // That is, we can safely transition _Event from -1 to either
5220 // 0 or 1.
5221 //
5222 // _Event serves as a restricted-range semaphore.
5223 // -1 : thread is blocked, i.e. there is a waiter
5224 // 0 : neutral: thread is running or ready,
5225 // could have been signaled after a wait started
5226 // 1 : signaled - thread is running or ready
5227 //
5228 // Another possible encoding of _Event would be with
5229 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5230 //
5231 // TODO-FIXME: add DTRACE probes for:
5232 // 1. Tx parks
5233 // 2. Ty unparks Tx
5234 // 3. Tx resumes from park
5235
5236
5237 // value determined through experimentation
5238 #define ROUNDINGFIX 11
5239
5240 // utility to compute the abstime argument to timedwait.
5241 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5242
5243 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5244 // millis is the relative timeout time
5245 // abstime will be the absolute timeout time
5246 if (millis < 0) millis = 0;
5247 struct timeval now;
5248 int status = gettimeofday(&now, NULL);
5249 assert(status == 0, "gettimeofday");
5250 jlong seconds = millis / 1000;
5251 jlong max_wait_period;
5252
5253 if (UseLWPSynchronization) {
5254 // forward port of fix for 4275818 (not sleeping long enough)
5255 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5256 // _lwp_cond_timedwait() used a round_down algorithm rather
5257 // than a round_up. For millis less than our roundfactor
5258 // it rounded down to 0 which doesn't meet the spec.
5259 // For millis > roundfactor we may return a bit sooner, but
5260 // since we can not accurately identify the patch level and
5261 // this has already been fixed in Solaris 9 and 8 we will
5262 // leave it alone rather than always rounding down.
5263
5264 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5265 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5266 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5267 max_wait_period = 21000000;
5268 } else {
5269 max_wait_period = 50000000;
5270 }
5271 millis %= 1000;
5272 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5273 seconds = max_wait_period;
5274 }
5275 abstime->tv_sec = now.tv_sec + seconds;
5276 long usec = now.tv_usec + millis * 1000;
5277 if (usec >= 1000000) {
5278 abstime->tv_sec += 1;
5279 usec -= 1000000;
5280 }
5281 abstime->tv_nsec = usec * 1000;
5282 return abstime;
5283 }
5284
5285 void os::PlatformEvent::park() { // AKA: down()
5286 // Transitions for _Event:
5287 // -1 => -1 : illegal
5288 // 1 => 0 : pass - return immediately
5289 // 0 => -1 : block; then set _Event to 0 before returning
5290
5291 // Invariant: Only the thread associated with the Event/PlatformEvent
5292 // may call park().
5293 assert(_nParked == 0, "invariant");
5294
5295 int v;
5296 for (;;) {
5297 v = _Event;
5298 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5299 }
5300 guarantee(v >= 0, "invariant");
5301 if (v == 0) {
5302 // Do this the hard way by blocking ...
5303 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5304 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5305 // Only for SPARC >= V8PlusA
5306 #if defined(__sparc) && defined(COMPILER2)
5307 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5308 #endif
5309 int status = os::Solaris::mutex_lock(_mutex);
5310 assert_status(status == 0, status, "mutex_lock");
5311 guarantee(_nParked == 0, "invariant");
5312 ++_nParked;
5313 while (_Event < 0) {
5314 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5315 // Treat this the same as if the wait was interrupted
5316 // With usr/lib/lwp going to kernel, always handle ETIME
5317 status = os::Solaris::cond_wait(_cond, _mutex);
5318 if (status == ETIME) status = EINTR;
5319 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5320 }
5321 --_nParked;
5322 _Event = 0;
5323 status = os::Solaris::mutex_unlock(_mutex);
5324 assert_status(status == 0, status, "mutex_unlock");
5325 // Paranoia to ensure our locked and lock-free paths interact
5326 // correctly with each other.
5327 OrderAccess::fence();
5328 }
5329 }
5330
5331 int os::PlatformEvent::park(jlong millis) {
5332 // Transitions for _Event:
5333 // -1 => -1 : illegal
5334 // 1 => 0 : pass - return immediately
5335 // 0 => -1 : block; then set _Event to 0 before returning
5336
5337 guarantee(_nParked == 0, "invariant");
5338 int v;
5339 for (;;) {
5340 v = _Event;
5341 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5342 }
5343 guarantee(v >= 0, "invariant");
5344 if (v != 0) return OS_OK;
5345
5346 int ret = OS_TIMEOUT;
5347 timestruc_t abst;
5348 compute_abstime(&abst, millis);
5349
5350 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5351 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5352 // Only for SPARC >= V8PlusA
5353 #if defined(__sparc) && defined(COMPILER2)
5354 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5355 #endif
5356 int status = os::Solaris::mutex_lock(_mutex);
5357 assert_status(status == 0, status, "mutex_lock");
5358 guarantee(_nParked == 0, "invariant");
5359 ++_nParked;
5360 while (_Event < 0) {
5361 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5362 assert_status(status == 0 || status == EINTR ||
5363 status == ETIME || status == ETIMEDOUT,
5364 status, "cond_timedwait");
5365 if (!FilterSpuriousWakeups) break; // previous semantics
5366 if (status == ETIME || status == ETIMEDOUT) break;
5367 // We consume and ignore EINTR and spurious wakeups.
5368 }
5369 --_nParked;
5370 if (_Event >= 0) ret = OS_OK;
5371 _Event = 0;
5372 status = os::Solaris::mutex_unlock(_mutex);
5373 assert_status(status == 0, status, "mutex_unlock");
5374 // Paranoia to ensure our locked and lock-free paths interact
5375 // correctly with each other.
5376 OrderAccess::fence();
5377 return ret;
5378 }
5379
5380 void os::PlatformEvent::unpark() {
5381 // Transitions for _Event:
5382 // 0 => 1 : just return
5383 // 1 => 1 : just return
5384 // -1 => either 0 or 1; must signal target thread
5385 // That is, we can safely transition _Event from -1 to either
5386 // 0 or 1.
5387 // See also: "Semaphores in Plan 9" by Mullender & Cox
5388 //
5389 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5390 // that it will take two back-to-back park() calls for the owning
5391 // thread to block. This has the benefit of forcing a spurious return
5392 // from the first park() call after an unpark() call which will help
5393 // shake out uses of park() and unpark() without condition variables.
5394
5395 if (Atomic::xchg(1, &_Event) >= 0) return;
5396
5397 // If the thread associated with the event was parked, wake it.
5398 // Wait for the thread assoc with the PlatformEvent to vacate.
5399 int status = os::Solaris::mutex_lock(_mutex);
5400 assert_status(status == 0, status, "mutex_lock");
5401 int AnyWaiters = _nParked;
5402 status = os::Solaris::mutex_unlock(_mutex);
5403 assert_status(status == 0, status, "mutex_unlock");
5404 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5405 if (AnyWaiters != 0) {
5406 // Note that we signal() *after* dropping the lock for "immortal" Events.
5407 // This is safe and avoids a common class of futile wakeups. In rare
5408 // circumstances this can cause a thread to return prematurely from
5409 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5410 // will simply re-test the condition and re-park itself.
5411 // This provides particular benefit if the underlying platform does not
5412 // provide wait morphing.
5413 status = os::Solaris::cond_signal(_cond);
5414 assert_status(status == 0, status, "cond_signal");
5415 }
5416 }
5417
5418 // JSR166
5419 // -------------------------------------------------------
5420
5421 // The solaris and linux implementations of park/unpark are fairly
5422 // conservative for now, but can be improved. They currently use a
5423 // mutex/condvar pair, plus _counter.
5424 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5425 // sets count to 1 and signals condvar. Only one thread ever waits
5426 // on the condvar. Contention seen when trying to park implies that someone
5427 // is unparking you, so don't wait. And spurious returns are fine, so there
5428 // is no need to track notifications.
5429
5430 #define MAX_SECS 100000000
5431
5432 // This code is common to linux and solaris and will be moved to a
5433 // common place in dolphin.
5434 //
5435 // The passed in time value is either a relative time in nanoseconds
5436 // or an absolute time in milliseconds. Either way it has to be unpacked
5437 // into suitable seconds and nanoseconds components and stored in the
5438 // given timespec structure.
5439 // Given time is a 64-bit value and the time_t used in the timespec is only
5440 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5441 // overflow if times way in the future are given. Further on Solaris versions
5442 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5443 // number of seconds, in abstime, is less than current_time + 100,000,000.
5444 // As it will be 28 years before "now + 100000000" will overflow we can
5445 // ignore overflow and just impose a hard-limit on seconds using the value
5446 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5447 // years from "now".
5448 //
5449 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5450 assert(time > 0, "convertTime");
5451
5452 struct timeval now;
5453 int status = gettimeofday(&now, NULL);
5454 assert(status == 0, "gettimeofday");
5455
5456 time_t max_secs = now.tv_sec + MAX_SECS;
5457
5458 if (isAbsolute) {
5459 jlong secs = time / 1000;
5460 if (secs > max_secs) {
5461 absTime->tv_sec = max_secs;
5462 } else {
5463 absTime->tv_sec = secs;
5464 }
5465 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5466 } else {
5467 jlong secs = time / NANOSECS_PER_SEC;
5468 if (secs >= MAX_SECS) {
5469 absTime->tv_sec = max_secs;
5470 absTime->tv_nsec = 0;
5471 } else {
5472 absTime->tv_sec = now.tv_sec + secs;
5473 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5474 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5475 absTime->tv_nsec -= NANOSECS_PER_SEC;
5476 ++absTime->tv_sec; // note: this must be <= max_secs
5477 }
5478 }
5479 }
5480 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5481 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5482 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5483 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5484 }
5485
5486 void Parker::park(bool isAbsolute, jlong time) {
5487 // Ideally we'd do something useful while spinning, such
5488 // as calling unpackTime().
5489
5490 // Optional fast-path check:
5491 // Return immediately if a permit is available.
5492 // We depend on Atomic::xchg() having full barrier semantics
5493 // since we are doing a lock-free update to _counter.
5494 if (Atomic::xchg(0, &_counter) > 0) return;
5495
5496 // Optional fast-exit: Check interrupt before trying to wait
5497 Thread* thread = Thread::current();
5498 assert(thread->is_Java_thread(), "Must be JavaThread");
5499 JavaThread *jt = (JavaThread *)thread;
5500 if (Thread::is_interrupted(thread, false)) {
5501 return;
5502 }
5503
5504 // First, demultiplex/decode time arguments
5505 timespec absTime;
5506 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5507 return;
5508 }
5509 if (time > 0) {
5510 // Warning: this code might be exposed to the old Solaris time
5511 // round-down bugs. Grep "roundingFix" for details.
5512 unpackTime(&absTime, isAbsolute, time);
5513 }
5514
5515 // Enter safepoint region
5516 // Beware of deadlocks such as 6317397.
5517 // The per-thread Parker:: _mutex is a classic leaf-lock.
5518 // In particular a thread must never block on the Threads_lock while
5519 // holding the Parker:: mutex. If safepoints are pending both the
5520 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5521 ThreadBlockInVM tbivm(jt);
5522
5523 // Don't wait if cannot get lock since interference arises from
5524 // unblocking. Also. check interrupt before trying wait
5525 if (Thread::is_interrupted(thread, false) ||
5526 os::Solaris::mutex_trylock(_mutex) != 0) {
5527 return;
5528 }
5529
5530 int status;
5531
5532 if (_counter > 0) { // no wait needed
5533 _counter = 0;
5534 status = os::Solaris::mutex_unlock(_mutex);
5535 assert(status == 0, "invariant");
5536 // Paranoia to ensure our locked and lock-free paths interact
5537 // correctly with each other and Java-level accesses.
5538 OrderAccess::fence();
5539 return;
5540 }
5541
5542 #ifdef ASSERT
5543 // Don't catch signals while blocked; let the running threads have the signals.
5544 // (This allows a debugger to break into the running thread.)
5545 sigset_t oldsigs;
5546 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5547 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5548 #endif
5549
5550 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5551 jt->set_suspend_equivalent();
5552 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5553
5554 // Do this the hard way by blocking ...
5555 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5556 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5557 // Only for SPARC >= V8PlusA
5558 #if defined(__sparc) && defined(COMPILER2)
5559 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5560 #endif
5561
5562 if (time == 0) {
5563 status = os::Solaris::cond_wait(_cond, _mutex);
5564 } else {
5565 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5566 }
5567 // Note that an untimed cond_wait() can sometimes return ETIME on older
5568 // versions of the Solaris.
5569 assert_status(status == 0 || status == EINTR ||
5570 status == ETIME || status == ETIMEDOUT,
5571 status, "cond_timedwait");
5572
5573 #ifdef ASSERT
5574 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL);
5575 #endif
5576 _counter = 0;
5577 status = os::Solaris::mutex_unlock(_mutex);
5578 assert_status(status == 0, status, "mutex_unlock");
5579 // Paranoia to ensure our locked and lock-free paths interact
5580 // correctly with each other and Java-level accesses.
5581 OrderAccess::fence();
5582
5583 // If externally suspended while waiting, re-suspend
5584 if (jt->handle_special_suspend_equivalent_condition()) {
5585 jt->java_suspend_self();
5586 }
5587 }
5588
5589 void Parker::unpark() {
5590 int status = os::Solaris::mutex_lock(_mutex);
5591 assert(status == 0, "invariant");
5592 const int s = _counter;
5593 _counter = 1;
5594 status = os::Solaris::mutex_unlock(_mutex);
5595 assert(status == 0, "invariant");
5596
5597 if (s < 1) {
5598 status = os::Solaris::cond_signal(_cond);
5599 assert(status == 0, "invariant");
5600 }
5601 }
5602
5603 extern char** environ;
5604
5605 // Run the specified command in a separate process. Return its exit value,
5606 // or -1 on failure (e.g. can't fork a new process).
5607 // Unlike system(), this function can be called from signal handler. It
5608 // doesn't block SIGINT et al.
5609 int os::fork_and_exec(char* cmd) {
5610 char * argv[4];
5611 argv[0] = (char *)"sh";
5612 argv[1] = (char *)"-c";
5613 argv[2] = cmd;
5614 argv[3] = NULL;
5615
5616 // fork is async-safe, fork1 is not so can't use in signal handler
5617 pid_t pid;
5618 Thread* t = ThreadLocalStorage::get_thread_slow();
5619 if (t != NULL && t->is_inside_signal_handler()) {
5620 pid = fork();
5621 } else {
5622 pid = fork1();
5623 }
5624
5625 if (pid < 0) {
5626 // fork failed
5627 warning("fork failed: %s", strerror(errno));
5628 return -1;
5629
5630 } else if (pid == 0) {
5631 // child process
5632
5633 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5634 execve("/usr/bin/sh", argv, environ);
5635
5636 // execve failed
5637 _exit(-1);
5638
5639 } else {
5640 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5641 // care about the actual exit code, for now.
5642
5643 int status;
5644
5645 // Wait for the child process to exit. This returns immediately if
5646 // the child has already exited. */
5647 while (waitpid(pid, &status, 0) < 0) {
5648 switch (errno) {
5649 case ECHILD: return 0;
5650 case EINTR: break;
5651 default: return -1;
5652 }
5653 }
5654
5655 if (WIFEXITED(status)) {
5656 // The child exited normally; get its exit code.
5657 return WEXITSTATUS(status);
5658 } else if (WIFSIGNALED(status)) {
5659 // The child exited because of a signal
5660 // The best value to return is 0x80 + signal number,
5661 // because that is what all Unix shells do, and because
5662 // it allows callers to distinguish between process exit and
5663 // process death by signal.
5664 return 0x80 + WTERMSIG(status);
5665 } else {
5666 // Unknown exit code; pass it through
5667 return status;
5668 }
5669 }
5670 }
5671
5672 // is_headless_jre()
5673 //
5674 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5675 // in order to report if we are running in a headless jre
5676 //
5677 // Since JDK8 xawt/libmawt.so was moved into the same directory
5678 // as libawt.so, and renamed libawt_xawt.so
5679 //
5680 bool os::is_headless_jre() {
5681 struct stat statbuf;
5682 char buf[MAXPATHLEN];
5683 char libmawtpath[MAXPATHLEN];
5684 const char *xawtstr = "/xawt/libmawt.so";
5685 const char *new_xawtstr = "/libawt_xawt.so";
5686 char *p;
5687
5688 // Get path to libjvm.so
5689 os::jvm_path(buf, sizeof(buf));
5690
5691 // Get rid of libjvm.so
5692 p = strrchr(buf, '/');
5693 if (p == NULL) {
5694 return false;
5695 } else {
5696 *p = '\0';
5697 }
5698
5699 // Get rid of client or server
5700 p = strrchr(buf, '/');
5701 if (p == NULL) {
5702 return false;
5703 } else {
5704 *p = '\0';
5705 }
5706
5707 // check xawt/libmawt.so
5708 strcpy(libmawtpath, buf);
5709 strcat(libmawtpath, xawtstr);
5710 if (::stat(libmawtpath, &statbuf) == 0) return false;
5711
5712 // check libawt_xawt.so
5713 strcpy(libmawtpath, buf);
5714 strcat(libmawtpath, new_xawtstr);
5715 if (::stat(libmawtpath, &statbuf) == 0) return false;
5716
5717 return true;
5718 }
5719
5720 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5721 size_t res;
5722 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5723 "Assumed _thread_in_native");
5724 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5725 return res;
5726 }
5727
5728 int os::close(int fd) {
5729 return ::close(fd);
5730 }
5731
5732 int os::socket_close(int fd) {
5733 return ::close(fd);
5734 }
5735
5736 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5737 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5738 "Assumed _thread_in_native");
5739 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5740 }
5741
5742 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5743 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5744 "Assumed _thread_in_native");
5745 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5746 }
5747
5748 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5749 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5750 }
5751
5752 // As both poll and select can be interrupted by signals, we have to be
5753 // prepared to restart the system call after updating the timeout, unless
5754 // a poll() is done with timeout == -1, in which case we repeat with this
5755 // "wait forever" value.
5756
5757 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5758 int _result;
5759 _result = ::connect(fd, him, len);
5760
5761 // On Solaris, when a connect() call is interrupted, the connection
5762 // can be established asynchronously (see 6343810). Subsequent calls
5763 // to connect() must check the errno value which has the semantic
5764 // described below (copied from the connect() man page). Handling
5765 // of asynchronously established connections is required for both
5766 // blocking and non-blocking sockets.
5767 // EINTR The connection attempt was interrupted
5768 // before any data arrived by the delivery of
5769 // a signal. The connection, however, will be
5770 // established asynchronously.
5771 //
5772 // EINPROGRESS The socket is non-blocking, and the connec-
5773 // tion cannot be completed immediately.
5774 //
5775 // EALREADY The socket is non-blocking, and a previous
5776 // connection attempt has not yet been com-
5777 // pleted.
5778 //
5779 // EISCONN The socket is already connected.
5780 if (_result == OS_ERR && errno == EINTR) {
5781 // restarting a connect() changes its errno semantics
5782 RESTARTABLE(::connect(fd, him, len), _result);
5783 // undo these changes
5784 if (_result == OS_ERR) {
5785 if (errno == EALREADY) {
5786 errno = EINPROGRESS; // fall through
5787 } else if (errno == EISCONN) {
5788 errno = 0;
5789 return OS_OK;
5790 }
5791 }
5792 }
5793 return _result;
5794 }
5795
5796 // Get the default path to the core file
5797 // Returns the length of the string
5798 int os::get_core_path(char* buffer, size_t bufferSize) {
5799 const char* p = get_current_directory(buffer, bufferSize);
5800
5801 if (p == NULL) {
5802 assert(p != NULL, "failed to get current directory");
5803 return 0;
5804 }
5805
5806 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5807 p, current_process_id());
5808
5809 return strlen(buffer);
5810 }
5811
5812 #ifndef PRODUCT
5813 void TestReserveMemorySpecial_test() {
5814 // No tests available for this platform
5815 }
5816 #endif