1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "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 "logging/log.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/filemap.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "os_share_solaris.hpp"
40 #include "os_solaris.inline.hpp"
41 #include "prims/jniFastGetField.hpp"
42 #include "prims/jvm.h"
43 #include "prims/jvm_misc.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/atomic.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/macros.hpp"
72 #include "utilities/vmError.hpp"
73
74 // put OS-includes here
75 # include <dlfcn.h>
76 # include <errno.h>
77 # include <exception>
78 # include <link.h>
79 # include <poll.h>
80 # include <pthread.h>
81 # include <schedctl.h>
82 # include <setjmp.h>
83 # include <signal.h>
84 # include <stdio.h>
85 # include <alloca.h>
86 # include <sys/filio.h>
87 # include <sys/ipc.h>
88 # include <sys/lwp.h>
89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
90 # include <sys/mman.h>
91 # include <sys/processor.h>
92 # include <sys/procset.h>
93 # include <sys/pset.h>
94 # include <sys/resource.h>
95 # include <sys/shm.h>
96 # include <sys/socket.h>
97 # include <sys/stat.h>
98 # include <sys/systeminfo.h>
99 # include <sys/time.h>
100 # include <sys/times.h>
101 # include <sys/types.h>
102 # include <sys/wait.h>
103 # include <sys/utsname.h>
104 # include <thread.h>
105 # include <unistd.h>
106 # include <sys/priocntl.h>
107 # include <sys/rtpriocntl.h>
108 # include <sys/tspriocntl.h>
109 # include <sys/iapriocntl.h>
110 # include <sys/fxpriocntl.h>
111 # include <sys/loadavg.h>
112 # include <string.h>
113 # include <stdio.h>
114
115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
116 # include <sys/procfs.h> // see comment in <sys/procfs.h>
117
118 #define MAX_PATH (2 * K)
119
120 // for timer info max values which include all bits
121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
122
123
124 // Here are some liblgrp types from sys/lgrp_user.h to be able to
125 // compile on older systems without this header file.
126
127 #ifndef MADV_ACCESS_LWP
128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
129 #endif
130 #ifndef MADV_ACCESS_MANY
131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
132 #endif
133
134 #ifndef LGRP_RSRC_CPU
135 #define LGRP_RSRC_CPU 0 /* CPU resources */
136 #endif
137 #ifndef LGRP_RSRC_MEM
138 #define LGRP_RSRC_MEM 1 /* memory resources */
139 #endif
140
141 // Values for ThreadPriorityPolicy == 1
142 int prio_policy1[CriticalPriority+1] = {
143 -99999, 0, 16, 32, 48, 64,
144 80, 96, 112, 124, 127, 127 };
145
146 // System parameters used internally
147 static clock_t clock_tics_per_sec = 100;
148
149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
150 static bool enabled_extended_FILE_stdio = false;
151
152 // For diagnostics to print a message once. see run_periodic_checks
153 static bool check_addr0_done = false;
154 static sigset_t check_signal_done;
155 static bool check_signals = true;
156
157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
159
160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
161
162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
163
164 // "default" initializers for missing libc APIs
165 extern "C" {
166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
168
169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
170 static int lwp_cond_destroy(cond_t *cv) { return 0; }
171 }
172
173 // "default" initializers for pthread-based synchronization
174 extern "C" {
175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
177 }
178
179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
180
181 static inline size_t adjust_stack_size(address base, size_t size) {
182 if ((ssize_t)size < 0) {
183 // 4759953: Compensate for ridiculous stack size.
184 size = max_intx;
185 }
186 if (size > (size_t)base) {
187 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
188 size = (size_t)base;
189 }
190 return size;
191 }
192
193 static inline stack_t get_stack_info() {
194 stack_t st;
195 int retval = thr_stksegment(&st);
196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
197 assert(retval == 0, "incorrect return value from thr_stksegment");
198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
200 return st;
201 }
202
203 address os::current_stack_base() {
204 int r = thr_main();
205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
206 bool is_primordial_thread = r;
207
208 // Workaround 4352906, avoid calls to thr_stksegment by
209 // thr_main after the first one (it looks like we trash
210 // some data, causing the value for ss_sp to be incorrect).
211 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
212 stack_t st = get_stack_info();
213 if (is_primordial_thread) {
214 // cache initial value of stack base
215 os::Solaris::_main_stack_base = (address)st.ss_sp;
216 }
217 return (address)st.ss_sp;
218 } else {
219 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
220 return os::Solaris::_main_stack_base;
221 }
222 }
223
224 size_t os::current_stack_size() {
225 size_t size;
226
227 int r = thr_main();
228 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
229 if (!r) {
230 size = get_stack_info().ss_size;
231 } else {
232 struct rlimit limits;
233 getrlimit(RLIMIT_STACK, &limits);
234 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
235 }
236 // base may not be page aligned
237 address base = current_stack_base();
238 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
239 return (size_t)(base - bottom);
240 }
241
242 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
243 return localtime_r(clock, res);
244 }
245
246 void os::Solaris::try_enable_extended_io() {
247 typedef int (*enable_extended_FILE_stdio_t)(int, int);
248
249 if (!UseExtendedFileIO) {
250 return;
251 }
252
253 enable_extended_FILE_stdio_t enabler =
254 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
255 "enable_extended_FILE_stdio");
256 if (enabler) {
257 enabler(-1, -1);
258 }
259 }
260
261 static int _processors_online = 0;
262
263 jint os::Solaris::_os_thread_limit = 0;
264 volatile jint os::Solaris::_os_thread_count = 0;
265
266 julong os::available_memory() {
267 return Solaris::available_memory();
268 }
269
270 julong os::Solaris::available_memory() {
271 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
272 }
273
274 julong os::Solaris::_physical_memory = 0;
275
276 julong os::physical_memory() {
277 return Solaris::physical_memory();
278 }
279
280 static hrtime_t first_hrtime = 0;
281 static const hrtime_t hrtime_hz = 1000*1000*1000;
282 static volatile hrtime_t max_hrtime = 0;
283
284
285 void os::Solaris::initialize_system_info() {
286 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
287 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
288 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
289 (julong)sysconf(_SC_PAGESIZE);
290 }
291
292 int os::active_processor_count() {
293 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
294 pid_t pid = getpid();
295 psetid_t pset = PS_NONE;
296 // Are we running in a processor set or is there any processor set around?
297 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
298 uint_t pset_cpus;
299 // Query the number of cpus available to us.
300 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
301 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
302 _processors_online = pset_cpus;
303 return pset_cpus;
304 }
305 }
306 // Otherwise return number of online cpus
307 return online_cpus;
308 }
309
310 static bool find_processors_in_pset(psetid_t pset,
311 processorid_t** id_array,
312 uint_t* id_length) {
313 bool result = false;
314 // Find the number of processors in the processor set.
315 if (pset_info(pset, NULL, id_length, NULL) == 0) {
316 // Make up an array to hold their ids.
317 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
318 // Fill in the array with their processor ids.
319 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
320 result = true;
321 }
322 }
323 return result;
324 }
325
326 // Callers of find_processors_online() must tolerate imprecise results --
327 // the system configuration can change asynchronously because of DR
328 // or explicit psradm operations.
329 //
330 // We also need to take care that the loop (below) terminates as the
331 // number of processors online can change between the _SC_NPROCESSORS_ONLN
332 // request and the loop that builds the list of processor ids. Unfortunately
333 // there's no reliable way to determine the maximum valid processor id,
334 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
335 // man pages, which claim the processor id set is "sparse, but
336 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
337 // exit the loop.
338 //
339 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
340 // not available on S8.0.
341
342 static bool find_processors_online(processorid_t** id_array,
343 uint* id_length) {
344 const processorid_t MAX_PROCESSOR_ID = 100000;
345 // Find the number of processors online.
346 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
347 // Make up an array to hold their ids.
348 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
349 // Processors need not be numbered consecutively.
350 long found = 0;
351 processorid_t next = 0;
352 while (found < *id_length && next < MAX_PROCESSOR_ID) {
353 processor_info_t info;
354 if (processor_info(next, &info) == 0) {
355 // NB, PI_NOINTR processors are effectively online ...
356 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
357 (*id_array)[found] = next;
358 found += 1;
359 }
360 }
361 next += 1;
362 }
363 if (found < *id_length) {
364 // The loop above didn't identify the expected number of processors.
365 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
366 // and re-running the loop, above, but there's no guarantee of progress
367 // if the system configuration is in flux. Instead, we just return what
368 // we've got. Note that in the worst case find_processors_online() could
369 // return an empty set. (As a fall-back in the case of the empty set we
370 // could just return the ID of the current processor).
371 *id_length = found;
372 }
373
374 return true;
375 }
376
377 static bool assign_distribution(processorid_t* id_array,
378 uint id_length,
379 uint* distribution,
380 uint distribution_length) {
381 // We assume we can assign processorid_t's to uint's.
382 assert(sizeof(processorid_t) == sizeof(uint),
383 "can't convert processorid_t to uint");
384 // Quick check to see if we won't succeed.
385 if (id_length < distribution_length) {
386 return false;
387 }
388 // Assign processor ids to the distribution.
389 // Try to shuffle processors to distribute work across boards,
390 // assuming 4 processors per board.
391 const uint processors_per_board = ProcessDistributionStride;
392 // Find the maximum processor id.
393 processorid_t max_id = 0;
394 for (uint m = 0; m < id_length; m += 1) {
395 max_id = MAX2(max_id, id_array[m]);
396 }
397 // The next id, to limit loops.
398 const processorid_t limit_id = max_id + 1;
399 // Make up markers for available processors.
400 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
401 for (uint c = 0; c < limit_id; c += 1) {
402 available_id[c] = false;
403 }
404 for (uint a = 0; a < id_length; a += 1) {
405 available_id[id_array[a]] = true;
406 }
407 // Step by "boards", then by "slot", copying to "assigned".
408 // NEEDS_CLEANUP: The assignment of processors should be stateful,
409 // remembering which processors have been assigned by
410 // previous calls, etc., so as to distribute several
411 // independent calls of this method. What we'd like is
412 // It would be nice to have an API that let us ask
413 // how many processes are bound to a processor,
414 // but we don't have that, either.
415 // In the short term, "board" is static so that
416 // subsequent distributions don't all start at board 0.
417 static uint board = 0;
418 uint assigned = 0;
419 // Until we've found enough processors ....
420 while (assigned < distribution_length) {
421 // ... find the next available processor in the board.
422 for (uint slot = 0; slot < processors_per_board; slot += 1) {
423 uint try_id = board * processors_per_board + slot;
424 if ((try_id < limit_id) && (available_id[try_id] == true)) {
425 distribution[assigned] = try_id;
426 available_id[try_id] = false;
427 assigned += 1;
428 break;
429 }
430 }
431 board += 1;
432 if (board * processors_per_board + 0 >= limit_id) {
433 board = 0;
434 }
435 }
436 if (available_id != NULL) {
437 FREE_C_HEAP_ARRAY(bool, available_id);
438 }
439 return true;
440 }
441
442 void os::set_native_thread_name(const char *name) {
443 if (Solaris::_pthread_setname_np != NULL) {
444 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
445 // but we explicitly copy into a size-limited buffer to avoid any
446 // possible overflow.
447 char buf[32];
448 snprintf(buf, sizeof(buf), "%s", name);
449 buf[sizeof(buf) - 1] = '\0';
450 Solaris::_pthread_setname_np(pthread_self(), buf);
451 }
452 }
453
454 bool os::distribute_processes(uint length, uint* distribution) {
455 bool result = false;
456 // Find the processor id's of all the available CPUs.
457 processorid_t* id_array = NULL;
458 uint id_length = 0;
459 // There are some races between querying information and using it,
460 // since processor sets can change dynamically.
461 psetid_t pset = PS_NONE;
462 // Are we running in a processor set?
463 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
464 result = find_processors_in_pset(pset, &id_array, &id_length);
465 } else {
466 result = find_processors_online(&id_array, &id_length);
467 }
468 if (result == true) {
469 if (id_length >= length) {
470 result = assign_distribution(id_array, id_length, distribution, length);
471 } else {
472 result = false;
473 }
474 }
475 if (id_array != NULL) {
476 FREE_C_HEAP_ARRAY(processorid_t, id_array);
477 }
478 return result;
479 }
480
481 bool os::bind_to_processor(uint processor_id) {
482 // We assume that a processorid_t can be stored in a uint.
483 assert(sizeof(uint) == sizeof(processorid_t),
484 "can't convert uint to processorid_t");
485 int bind_result =
486 processor_bind(P_LWPID, // bind LWP.
487 P_MYID, // bind current LWP.
488 (processorid_t) processor_id, // id.
489 NULL); // don't return old binding.
490 return (bind_result == 0);
491 }
492
493 // Return true if user is running as root.
494
495 bool os::have_special_privileges() {
496 static bool init = false;
497 static bool privileges = false;
498 if (!init) {
499 privileges = (getuid() != geteuid()) || (getgid() != getegid());
500 init = true;
501 }
502 return privileges;
503 }
504
505
506 void os::init_system_properties_values() {
507 // The next steps are taken in the product version:
508 //
509 // Obtain the JAVA_HOME value from the location of libjvm.so.
510 // This library should be located at:
511 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
512 //
513 // If "/jre/lib/" appears at the right place in the path, then we
514 // assume libjvm.so is installed in a JDK and we use this path.
515 //
516 // Otherwise exit with message: "Could not create the Java virtual machine."
517 //
518 // The following extra steps are taken in the debugging version:
519 //
520 // If "/jre/lib/" does NOT appear at the right place in the path
521 // instead of exit check for $JAVA_HOME environment variable.
522 //
523 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
524 // then we append a fake suffix "hotspot/libjvm.so" to this path so
525 // it looks like libjvm.so is installed there
526 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
527 //
528 // Otherwise exit.
529 //
530 // Important note: if the location of libjvm.so changes this
531 // code needs to be changed accordingly.
532
533 // Base path of extensions installed on the system.
534 #define SYS_EXT_DIR "/usr/jdk/packages"
535 #define EXTENSIONS_DIR "/lib/ext"
536
537 // Buffer that fits several sprintfs.
538 // Note that the space for the colon and the trailing null are provided
539 // by the nulls included by the sizeof operator.
540 const size_t bufsize =
541 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
542 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path
543 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
544 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
545
546 // sysclasspath, java_home, dll_dir
547 {
548 char *pslash;
549 os::jvm_path(buf, bufsize);
550
551 // Found the full path to libjvm.so.
552 // Now cut the path to <java_home>/jre if we can.
553 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
554 pslash = strrchr(buf, '/');
555 if (pslash != NULL) {
556 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
557 }
558 Arguments::set_dll_dir(buf);
559
560 if (pslash != NULL) {
561 pslash = strrchr(buf, '/');
562 if (pslash != NULL) {
563 *pslash = '\0'; // Get rid of /lib.
564 }
565 }
566 Arguments::set_java_home(buf);
567 set_boot_path('/', ':');
568 }
569
570 // Where to look for native libraries.
571 {
572 // Use dlinfo() to determine the correct java.library.path.
573 //
574 // If we're launched by the Java launcher, and the user
575 // does not set java.library.path explicitly on the commandline,
576 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
577 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
578 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
579 // /usr/lib), which is exactly what we want.
580 //
581 // If the user does set java.library.path, it completely
582 // overwrites this setting, and always has.
583 //
584 // If we're not launched by the Java launcher, we may
585 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
586 // settings. Again, dlinfo does exactly what we want.
587
588 Dl_serinfo info_sz, *info = &info_sz;
589 Dl_serpath *path;
590 char *library_path;
591 char *common_path = buf;
592
593 // Determine search path count and required buffer size.
594 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
595 FREE_C_HEAP_ARRAY(char, buf);
596 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
597 }
598
599 // Allocate new buffer and initialize.
600 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
601 info->dls_size = info_sz.dls_size;
602 info->dls_cnt = info_sz.dls_cnt;
603
604 // Obtain search path information.
605 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
606 FREE_C_HEAP_ARRAY(char, buf);
607 FREE_C_HEAP_ARRAY(char, info);
608 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
609 }
610
611 path = &info->dls_serpath[0];
612
613 // Note: Due to a legacy implementation, most of the library path
614 // is set in the launcher. This was to accomodate linking restrictions
615 // on legacy Solaris implementations (which are no longer supported).
616 // Eventually, all the library path setting will be done here.
617 //
618 // However, to prevent the proliferation of improperly built native
619 // libraries, the new path component /usr/jdk/packages is added here.
620
621 // Construct the invariant part of ld_library_path.
622 sprintf(common_path, SYS_EXT_DIR "/lib");
623
624 // Struct size is more than sufficient for the path components obtained
625 // through the dlinfo() call, so only add additional space for the path
626 // components explicitly added here.
627 size_t library_path_size = info->dls_size + strlen(common_path);
628 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
629 library_path[0] = '\0';
630
631 // Construct the desired Java library path from the linker's library
632 // search path.
633 //
634 // For compatibility, it is optimal that we insert the additional path
635 // components specific to the Java VM after those components specified
636 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
637 // infrastructure.
638 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
639 strcpy(library_path, common_path);
640 } else {
641 int inserted = 0;
642 int i;
643 for (i = 0; i < info->dls_cnt; i++, path++) {
644 uint_t flags = path->dls_flags & LA_SER_MASK;
645 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
646 strcat(library_path, common_path);
647 strcat(library_path, os::path_separator());
648 inserted = 1;
649 }
650 strcat(library_path, path->dls_name);
651 strcat(library_path, os::path_separator());
652 }
653 // Eliminate trailing path separator.
654 library_path[strlen(library_path)-1] = '\0';
655 }
656
657 // happens before argument parsing - can't use a trace flag
658 // tty->print_raw("init_system_properties_values: native lib path: ");
659 // tty->print_raw_cr(library_path);
660
661 // Callee copies into its own buffer.
662 Arguments::set_library_path(library_path);
663
664 FREE_C_HEAP_ARRAY(char, library_path);
665 FREE_C_HEAP_ARRAY(char, info);
666 }
667
668 // Extensions directories.
669 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
670 Arguments::set_ext_dirs(buf);
671
672 FREE_C_HEAP_ARRAY(char, buf);
673
674 #undef SYS_EXT_DIR
675 #undef EXTENSIONS_DIR
676 }
677
678 void os::breakpoint() {
679 BREAKPOINT;
680 }
681
682 bool os::obsolete_option(const JavaVMOption *option) {
683 if (!strncmp(option->optionString, "-Xt", 3)) {
684 return true;
685 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
686 return true;
687 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
688 return true;
689 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
690 return true;
691 }
692 return false;
693 }
694
695 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
696 address stackStart = (address)thread->stack_base();
697 address stackEnd = (address)(stackStart - (address)thread->stack_size());
698 if (sp < stackStart && sp >= stackEnd) return true;
699 return false;
700 }
701
702 extern "C" void breakpoint() {
703 // use debugger to set breakpoint here
704 }
705
706 static thread_t main_thread;
707
708 // Thread start routine for all newly created threads
709 extern "C" void* thread_native_entry(void* thread_addr) {
710 // Try to randomize the cache line index of hot stack frames.
711 // This helps when threads of the same stack traces evict each other's
712 // cache lines. The threads can be either from the same JVM instance, or
713 // from different JVM instances. The benefit is especially true for
714 // processors with hyperthreading technology.
715 static int counter = 0;
716 int pid = os::current_process_id();
717 alloca(((pid ^ counter++) & 7) * 128);
718
719 int prio;
720 Thread* thread = (Thread*)thread_addr;
721
722 thread->initialize_thread_current();
723
724 OSThread* osthr = thread->osthread();
725
726 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
727 thread->_schedctl = (void *) schedctl_init();
728
729 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
730 os::current_thread_id());
731
732 if (UseNUMA) {
733 int lgrp_id = os::numa_get_group_id();
734 if (lgrp_id != -1) {
735 thread->set_lgrp_id(lgrp_id);
736 }
737 }
738
739 // Our priority was set when we were created, and stored in the
740 // osthread, but couldn't be passed through to our LWP until now.
741 // So read back the priority and set it again.
742
743 if (osthr->thread_id() != -1) {
744 if (UseThreadPriorities) {
745 int prio = osthr->native_priority();
746 if (ThreadPriorityVerbose) {
747 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
748 INTPTR_FORMAT ", setting priority: %d\n",
749 osthr->thread_id(), osthr->lwp_id(), prio);
750 }
751 os::set_native_priority(thread, prio);
752 }
753 } else if (ThreadPriorityVerbose) {
754 warning("Can't set priority in _start routine, thread id hasn't been set\n");
755 }
756
757 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
758
759 // initialize signal mask for this thread
760 os::Solaris::hotspot_sigmask(thread);
761
762 thread->run();
763
764 // One less thread is executing
765 // When the VMThread gets here, the main thread may have already exited
766 // which frees the CodeHeap containing the Atomic::dec code
767 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
768 Atomic::dec(&os::Solaris::_os_thread_count);
769 }
770
771 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
772
773 // If a thread has not deleted itself ("delete this") as part of its
774 // termination sequence, we have to ensure thread-local-storage is
775 // cleared before we actually terminate. No threads should ever be
776 // deleted asynchronously with respect to their termination.
777 if (Thread::current_or_null_safe() != NULL) {
778 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
779 thread->clear_thread_current();
780 }
781
782 if (UseDetachedThreads) {
783 thr_exit(NULL);
784 ShouldNotReachHere();
785 }
786 return NULL;
787 }
788
789 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
790 // Allocate the OSThread object
791 OSThread* osthread = new OSThread(NULL, NULL);
792 if (osthread == NULL) return NULL;
793
794 // Store info on the Solaris thread into the OSThread
795 osthread->set_thread_id(thread_id);
796 osthread->set_lwp_id(_lwp_self());
797 thread->_schedctl = (void *) schedctl_init();
798
799 if (UseNUMA) {
800 int lgrp_id = os::numa_get_group_id();
801 if (lgrp_id != -1) {
802 thread->set_lgrp_id(lgrp_id);
803 }
804 }
805
806 if (ThreadPriorityVerbose) {
807 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
808 osthread->thread_id(), osthread->lwp_id());
809 }
810
811 // Initial thread state is INITIALIZED, not SUSPENDED
812 osthread->set_state(INITIALIZED);
813
814 return osthread;
815 }
816
817 void os::Solaris::hotspot_sigmask(Thread* thread) {
818 //Save caller's signal mask
819 sigset_t sigmask;
820 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
821 OSThread *osthread = thread->osthread();
822 osthread->set_caller_sigmask(sigmask);
823
824 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
825 if (!ReduceSignalUsage) {
826 if (thread->is_VM_thread()) {
827 // Only the VM thread handles BREAK_SIGNAL ...
828 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
829 } else {
830 // ... all other threads block BREAK_SIGNAL
831 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
832 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
833 }
834 }
835 }
836
837 bool os::create_attached_thread(JavaThread* thread) {
838 #ifdef ASSERT
839 thread->verify_not_published();
840 #endif
841 OSThread* osthread = create_os_thread(thread, thr_self());
842 if (osthread == NULL) {
843 return false;
844 }
845
846 // Initial thread state is RUNNABLE
847 osthread->set_state(RUNNABLE);
848 thread->set_osthread(osthread);
849
850 // initialize signal mask for this thread
851 // and save the caller's signal mask
852 os::Solaris::hotspot_sigmask(thread);
853
854 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
855 os::current_thread_id());
856
857 return true;
858 }
859
860 bool os::create_main_thread(JavaThread* thread) {
861 #ifdef ASSERT
862 thread->verify_not_published();
863 #endif
864 if (_starting_thread == NULL) {
865 _starting_thread = create_os_thread(thread, main_thread);
866 if (_starting_thread == NULL) {
867 return false;
868 }
869 }
870
871 // The primodial thread is runnable from the start
872 _starting_thread->set_state(RUNNABLE);
873
874 thread->set_osthread(_starting_thread);
875
876 // initialize signal mask for this thread
877 // and save the caller's signal mask
878 os::Solaris::hotspot_sigmask(thread);
879
880 return true;
881 }
882
883 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
884 static char* describe_thr_create_attributes(char* buf, size_t buflen,
885 size_t stacksize, long flags) {
886 stringStream ss(buf, buflen);
887 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
888 ss.print("flags: ");
889 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
890 #define ALL(X) \
891 X(THR_SUSPENDED) \
892 X(THR_DETACHED) \
893 X(THR_BOUND) \
894 X(THR_NEW_LWP) \
895 X(THR_DAEMON)
896 ALL(PRINT_FLAG)
897 #undef ALL
898 #undef PRINT_FLAG
899 return buf;
900 }
901
902 // return default stack size for thr_type
903 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
904 // default stack size when not specified by caller is 1M (2M for LP64)
905 size_t s = (BytesPerWord >> 2) * K * K;
906 return s;
907 }
908
909 bool os::create_thread(Thread* thread, ThreadType thr_type,
910 size_t req_stack_size) {
911 // Allocate the OSThread object
912 OSThread* osthread = new OSThread(NULL, NULL);
913 if (osthread == NULL) {
914 return false;
915 }
916
917 if (ThreadPriorityVerbose) {
918 char *thrtyp;
919 switch (thr_type) {
920 case vm_thread:
921 thrtyp = (char *)"vm";
922 break;
923 case cgc_thread:
924 thrtyp = (char *)"cgc";
925 break;
926 case pgc_thread:
927 thrtyp = (char *)"pgc";
928 break;
929 case java_thread:
930 thrtyp = (char *)"java";
931 break;
932 case compiler_thread:
933 thrtyp = (char *)"compiler";
934 break;
935 case watcher_thread:
936 thrtyp = (char *)"watcher";
937 break;
938 default:
939 thrtyp = (char *)"unknown";
940 break;
941 }
942 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
943 }
944
945 // calculate stack size if it's not specified by caller
946 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
947
948 // Initial state is ALLOCATED but not INITIALIZED
949 osthread->set_state(ALLOCATED);
950
951 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
952 // We got lots of threads. Check if we still have some address space left.
953 // Need to be at least 5Mb of unreserved address space. We do check by
954 // trying to reserve some.
955 const size_t VirtualMemoryBangSize = 20*K*K;
956 char* mem = os::reserve_memory(VirtualMemoryBangSize);
957 if (mem == NULL) {
958 delete osthread;
959 return false;
960 } else {
961 // Release the memory again
962 os::release_memory(mem, VirtualMemoryBangSize);
963 }
964 }
965
966 // Setup osthread because the child thread may need it.
967 thread->set_osthread(osthread);
968
969 // Create the Solaris thread
970 thread_t tid = 0;
971 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
972 int status;
973
974 // Mark that we don't have an lwp or thread id yet.
975 // In case we attempt to set the priority before the thread starts.
976 osthread->set_lwp_id(-1);
977 osthread->set_thread_id(-1);
978
979 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid);
980
981 char buf[64];
982 if (status == 0) {
983 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
984 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
985 } else {
986 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
987 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
988 }
989
990 if (status != 0) {
991 thread->set_osthread(NULL);
992 // Need to clean up stuff we've allocated so far
993 delete osthread;
994 return false;
995 }
996
997 Atomic::inc(&os::Solaris::_os_thread_count);
998
999 // Store info on the Solaris thread into the OSThread
1000 osthread->set_thread_id(tid);
1001
1002 // Remember that we created this thread so we can set priority on it
1003 osthread->set_vm_created();
1004
1005 // Most thread types will set an explicit priority before starting the thread,
1006 // but for those that don't we need a valid value to read back in thread_native_entry.
1007 osthread->set_native_priority(NormPriority);
1008
1009 // Initial thread state is INITIALIZED, not SUSPENDED
1010 osthread->set_state(INITIALIZED);
1011
1012 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1013 return true;
1014 }
1015
1016 debug_only(static bool signal_sets_initialized = false);
1017 static sigset_t unblocked_sigs, vm_sigs;
1018
1019 bool os::Solaris::is_sig_ignored(int sig) {
1020 struct sigaction oact;
1021 sigaction(sig, (struct sigaction*)NULL, &oact);
1022 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1023 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1024 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1025 return true;
1026 } else {
1027 return false;
1028 }
1029 }
1030
1031 void os::Solaris::signal_sets_init() {
1032 // Should also have an assertion stating we are still single-threaded.
1033 assert(!signal_sets_initialized, "Already initialized");
1034 // Fill in signals that are necessarily unblocked for all threads in
1035 // the VM. Currently, we unblock the following signals:
1036 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1037 // by -Xrs (=ReduceSignalUsage));
1038 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1039 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1040 // the dispositions or masks wrt these signals.
1041 // Programs embedding the VM that want to use the above signals for their
1042 // own purposes must, at this time, use the "-Xrs" option to prevent
1043 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1044 // (See bug 4345157, and other related bugs).
1045 // In reality, though, unblocking these signals is really a nop, since
1046 // these signals are not blocked by default.
1047 sigemptyset(&unblocked_sigs);
1048 sigaddset(&unblocked_sigs, SIGILL);
1049 sigaddset(&unblocked_sigs, SIGSEGV);
1050 sigaddset(&unblocked_sigs, SIGBUS);
1051 sigaddset(&unblocked_sigs, SIGFPE);
1052 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1053
1054 if (!ReduceSignalUsage) {
1055 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1056 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1057 }
1058 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1059 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1060 }
1061 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1062 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1063 }
1064 }
1065 // Fill in signals that are blocked by all but the VM thread.
1066 sigemptyset(&vm_sigs);
1067 if (!ReduceSignalUsage) {
1068 sigaddset(&vm_sigs, BREAK_SIGNAL);
1069 }
1070 debug_only(signal_sets_initialized = true);
1071
1072 // For diagnostics only used in run_periodic_checks
1073 sigemptyset(&check_signal_done);
1074 }
1075
1076 // These are signals that are unblocked while a thread is running Java.
1077 // (For some reason, they get blocked by default.)
1078 sigset_t* os::Solaris::unblocked_signals() {
1079 assert(signal_sets_initialized, "Not initialized");
1080 return &unblocked_sigs;
1081 }
1082
1083 // These are the signals that are blocked while a (non-VM) thread is
1084 // running Java. Only the VM thread handles these signals.
1085 sigset_t* os::Solaris::vm_signals() {
1086 assert(signal_sets_initialized, "Not initialized");
1087 return &vm_sigs;
1088 }
1089
1090 void _handle_uncaught_cxx_exception() {
1091 VMError::report_and_die("An uncaught C++ exception");
1092 }
1093
1094
1095 // First crack at OS-specific initialization, from inside the new thread.
1096 void os::initialize_thread(Thread* thr) {
1097 int r = thr_main();
1098 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1099 if (r) {
1100 JavaThread* jt = (JavaThread *)thr;
1101 assert(jt != NULL, "Sanity check");
1102 size_t stack_size;
1103 address base = jt->stack_base();
1104 if (Arguments::created_by_java_launcher()) {
1105 // Use 2MB to allow for Solaris 7 64 bit mode.
1106 stack_size = JavaThread::stack_size_at_create() == 0
1107 ? 2048*K : JavaThread::stack_size_at_create();
1108
1109 // There are rare cases when we may have already used more than
1110 // the basic stack size allotment before this method is invoked.
1111 // Attempt to allow for a normally sized java_stack.
1112 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1113 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1114 } else {
1115 // 6269555: If we were not created by a Java launcher, i.e. if we are
1116 // running embedded in a native application, treat the primordial thread
1117 // as much like a native attached thread as possible. This means using
1118 // the current stack size from thr_stksegment(), unless it is too large
1119 // to reliably setup guard pages. A reasonable max size is 8MB.
1120 size_t current_size = current_stack_size();
1121 // This should never happen, but just in case....
1122 if (current_size == 0) current_size = 2 * K * K;
1123 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1124 }
1125 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1126 stack_size = (size_t)(base - bottom);
1127
1128 assert(stack_size > 0, "Stack size calculation problem");
1129
1130 if (stack_size > jt->stack_size()) {
1131 #ifndef PRODUCT
1132 struct rlimit limits;
1133 getrlimit(RLIMIT_STACK, &limits);
1134 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1135 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1136 #endif
1137 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1138 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1139 "See limit(1) to increase the stack size limit.",
1140 stack_size / K, jt->stack_size() / K);
1141 vm_exit(1);
1142 }
1143 assert(jt->stack_size() >= stack_size,
1144 "Attempt to map more stack than was allocated");
1145 jt->set_stack_size(stack_size);
1146 }
1147
1148 // With the T2 libthread (T1 is no longer supported) threads are always bound
1149 // and we use stackbanging in all cases.
1150
1151 os::Solaris::init_thread_fpu_state();
1152 std::set_terminate(_handle_uncaught_cxx_exception);
1153 }
1154
1155
1156
1157 // Free Solaris resources related to the OSThread
1158 void os::free_thread(OSThread* osthread) {
1159 assert(osthread != NULL, "os::free_thread but osthread not set");
1160
1161 // We are told to free resources of the argument thread,
1162 // but we can only really operate on the current thread.
1163 assert(Thread::current()->osthread() == osthread,
1164 "os::free_thread but not current thread");
1165
1166 // Restore caller's signal mask
1167 sigset_t sigmask = osthread->caller_sigmask();
1168 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1169
1170 delete osthread;
1171 }
1172
1173 void os::pd_start_thread(Thread* thread) {
1174 int status = thr_continue(thread->osthread()->thread_id());
1175 assert_status(status == 0, status, "thr_continue failed");
1176 }
1177
1178
1179 intx os::current_thread_id() {
1180 return (intx)thr_self();
1181 }
1182
1183 static pid_t _initial_pid = 0;
1184
1185 int os::current_process_id() {
1186 return (int)(_initial_pid ? _initial_pid : getpid());
1187 }
1188
1189 // gethrtime() should be monotonic according to the documentation,
1190 // but some virtualized platforms are known to break this guarantee.
1191 // getTimeNanos() must be guaranteed not to move backwards, so we
1192 // are forced to add a check here.
1193 inline hrtime_t getTimeNanos() {
1194 const hrtime_t now = gethrtime();
1195 const hrtime_t prev = max_hrtime;
1196 if (now <= prev) {
1197 return prev; // same or retrograde time;
1198 }
1199 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1200 assert(obsv >= prev, "invariant"); // Monotonicity
1201 // If the CAS succeeded then we're done and return "now".
1202 // If the CAS failed and the observed value "obsv" is >= now then
1203 // we should return "obsv". If the CAS failed and now > obsv > prv then
1204 // some other thread raced this thread and installed a new value, in which case
1205 // we could either (a) retry the entire operation, (b) retry trying to install now
1206 // or (c) just return obsv. We use (c). No loop is required although in some cases
1207 // we might discard a higher "now" value in deference to a slightly lower but freshly
1208 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1209 // to (a) or (b) -- and greatly reduces coherence traffic.
1210 // We might also condition (c) on the magnitude of the delta between obsv and now.
1211 // Avoiding excessive CAS operations to hot RW locations is critical.
1212 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1213 return (prev == obsv) ? now : obsv;
1214 }
1215
1216 // Time since start-up in seconds to a fine granularity.
1217 // Used by VMSelfDestructTimer and the MemProfiler.
1218 double os::elapsedTime() {
1219 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1220 }
1221
1222 jlong os::elapsed_counter() {
1223 return (jlong)(getTimeNanos() - first_hrtime);
1224 }
1225
1226 jlong os::elapsed_frequency() {
1227 return hrtime_hz;
1228 }
1229
1230 // Return the real, user, and system times in seconds from an
1231 // arbitrary fixed point in the past.
1232 bool os::getTimesSecs(double* process_real_time,
1233 double* process_user_time,
1234 double* process_system_time) {
1235 struct tms ticks;
1236 clock_t real_ticks = times(&ticks);
1237
1238 if (real_ticks == (clock_t) (-1)) {
1239 return false;
1240 } else {
1241 double ticks_per_second = (double) clock_tics_per_sec;
1242 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1243 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1244 // For consistency return the real time from getTimeNanos()
1245 // converted to seconds.
1246 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1247
1248 return true;
1249 }
1250 }
1251
1252 bool os::supports_vtime() { return true; }
1253 bool os::enable_vtime() { return false; }
1254 bool os::vtime_enabled() { return false; }
1255
1256 double os::elapsedVTime() {
1257 return (double)gethrvtime() / (double)hrtime_hz;
1258 }
1259
1260 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1261 jlong os::javaTimeMillis() {
1262 timeval t;
1263 if (gettimeofday(&t, NULL) == -1) {
1264 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1265 }
1266 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1267 }
1268
1269 // Must return seconds+nanos since Jan 1 1970. This must use the same
1270 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1271 // we need better than 1ms accuracy
1272 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1273 timeval t;
1274 if (gettimeofday(&t, NULL) == -1) {
1275 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1276 }
1277 seconds = jlong(t.tv_sec);
1278 nanos = jlong(t.tv_usec) * 1000;
1279 }
1280
1281
1282 jlong os::javaTimeNanos() {
1283 return (jlong)getTimeNanos();
1284 }
1285
1286 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1287 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1288 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1289 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1290 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1291 }
1292
1293 char * os::local_time_string(char *buf, size_t buflen) {
1294 struct tm t;
1295 time_t long_time;
1296 time(&long_time);
1297 localtime_r(&long_time, &t);
1298 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1299 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1300 t.tm_hour, t.tm_min, t.tm_sec);
1301 return buf;
1302 }
1303
1304 // Note: os::shutdown() might be called very early during initialization, or
1305 // called from signal handler. Before adding something to os::shutdown(), make
1306 // sure it is async-safe and can handle partially initialized VM.
1307 void os::shutdown() {
1308
1309 // allow PerfMemory to attempt cleanup of any persistent resources
1310 perfMemory_exit();
1311
1312 // needs to remove object in file system
1313 AttachListener::abort();
1314
1315 // flush buffered output, finish log files
1316 ostream_abort();
1317
1318 // Check for abort hook
1319 abort_hook_t abort_hook = Arguments::abort_hook();
1320 if (abort_hook != NULL) {
1321 abort_hook();
1322 }
1323 }
1324
1325 // Note: os::abort() might be called very early during initialization, or
1326 // called from signal handler. Before adding something to os::abort(), make
1327 // sure it is async-safe and can handle partially initialized VM.
1328 void os::abort(bool dump_core, void* siginfo, const void* context) {
1329 os::shutdown();
1330 if (dump_core) {
1331 #ifndef PRODUCT
1332 fdStream out(defaultStream::output_fd());
1333 out.print_raw("Current thread is ");
1334 char buf[16];
1335 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1336 out.print_raw_cr(buf);
1337 out.print_raw_cr("Dumping core ...");
1338 #endif
1339 ::abort(); // dump core (for debugging)
1340 }
1341
1342 ::exit(1);
1343 }
1344
1345 // Die immediately, no exit hook, no abort hook, no cleanup.
1346 void os::die() {
1347 ::abort(); // dump core (for debugging)
1348 }
1349
1350 // DLL functions
1351
1352 const char* os::dll_file_extension() { return ".so"; }
1353
1354 // This must be hard coded because it's the system's temporary
1355 // directory not the java application's temp directory, ala java.io.tmpdir.
1356 const char* os::get_temp_directory() { return "/tmp"; }
1357
1358 static bool file_exists(const char* filename) {
1359 struct stat statbuf;
1360 if (filename == NULL || strlen(filename) == 0) {
1361 return false;
1362 }
1363 return os::stat(filename, &statbuf) == 0;
1364 }
1365
1366 bool os::dll_build_name(char* buffer, size_t buflen,
1367 const char* pname, const char* fname) {
1368 bool retval = false;
1369 const size_t pnamelen = pname ? strlen(pname) : 0;
1370
1371 // Return error on buffer overflow.
1372 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1373 return retval;
1374 }
1375
1376 if (pnamelen == 0) {
1377 snprintf(buffer, buflen, "lib%s.so", fname);
1378 retval = true;
1379 } else if (strchr(pname, *os::path_separator()) != NULL) {
1380 int n;
1381 char** pelements = split_path(pname, &n);
1382 if (pelements == NULL) {
1383 return false;
1384 }
1385 for (int i = 0; i < n; i++) {
1386 // really shouldn't be NULL but what the heck, check can't hurt
1387 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1388 continue; // skip the empty path values
1389 }
1390 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1391 if (file_exists(buffer)) {
1392 retval = true;
1393 break;
1394 }
1395 }
1396 // release the storage
1397 for (int i = 0; i < n; i++) {
1398 if (pelements[i] != NULL) {
1399 FREE_C_HEAP_ARRAY(char, pelements[i]);
1400 }
1401 }
1402 if (pelements != NULL) {
1403 FREE_C_HEAP_ARRAY(char*, pelements);
1404 }
1405 } else {
1406 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1407 retval = true;
1408 }
1409 return retval;
1410 }
1411
1412 // check if addr is inside libjvm.so
1413 bool os::address_is_in_vm(address addr) {
1414 static address libjvm_base_addr;
1415 Dl_info dlinfo;
1416
1417 if (libjvm_base_addr == NULL) {
1418 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1419 libjvm_base_addr = (address)dlinfo.dli_fbase;
1420 }
1421 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1422 }
1423
1424 if (dladdr((void *)addr, &dlinfo) != 0) {
1425 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1426 }
1427
1428 return false;
1429 }
1430
1431 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1432 static dladdr1_func_type dladdr1_func = NULL;
1433
1434 bool os::dll_address_to_function_name(address addr, char *buf,
1435 int buflen, int * offset,
1436 bool demangle) {
1437 // buf is not optional, but offset is optional
1438 assert(buf != NULL, "sanity check");
1439
1440 Dl_info dlinfo;
1441
1442 // dladdr1_func was initialized in os::init()
1443 if (dladdr1_func != NULL) {
1444 // yes, we have dladdr1
1445
1446 // Support for dladdr1 is checked at runtime; it may be
1447 // available even if the vm is built on a machine that does
1448 // not have dladdr1 support. Make sure there is a value for
1449 // RTLD_DL_SYMENT.
1450 #ifndef RTLD_DL_SYMENT
1451 #define RTLD_DL_SYMENT 1
1452 #endif
1453 #ifdef _LP64
1454 Elf64_Sym * info;
1455 #else
1456 Elf32_Sym * info;
1457 #endif
1458 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1459 RTLD_DL_SYMENT) != 0) {
1460 // see if we have a matching symbol that covers our address
1461 if (dlinfo.dli_saddr != NULL &&
1462 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1463 if (dlinfo.dli_sname != NULL) {
1464 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1465 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1466 }
1467 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1468 return true;
1469 }
1470 }
1471 // no matching symbol so try for just file info
1472 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1473 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1474 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1475 return true;
1476 }
1477 }
1478 }
1479 buf[0] = '\0';
1480 if (offset != NULL) *offset = -1;
1481 return false;
1482 }
1483
1484 // no, only dladdr is available
1485 if (dladdr((void *)addr, &dlinfo) != 0) {
1486 // see if we have a matching symbol
1487 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1488 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1489 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1490 }
1491 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1492 return true;
1493 }
1494 // no matching symbol so try for just file info
1495 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1496 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1497 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1498 return true;
1499 }
1500 }
1501 }
1502 buf[0] = '\0';
1503 if (offset != NULL) *offset = -1;
1504 return false;
1505 }
1506
1507 bool os::dll_address_to_library_name(address addr, char* buf,
1508 int buflen, int* offset) {
1509 // buf is not optional, but offset is optional
1510 assert(buf != NULL, "sanity check");
1511
1512 Dl_info dlinfo;
1513
1514 if (dladdr((void*)addr, &dlinfo) != 0) {
1515 if (dlinfo.dli_fname != NULL) {
1516 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1517 }
1518 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1519 *offset = addr - (address)dlinfo.dli_fbase;
1520 }
1521 return true;
1522 }
1523
1524 buf[0] = '\0';
1525 if (offset) *offset = -1;
1526 return false;
1527 }
1528
1529 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1530 Dl_info dli;
1531 // Sanity check?
1532 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1533 dli.dli_fname == NULL) {
1534 return 1;
1535 }
1536
1537 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1538 if (handle == NULL) {
1539 return 1;
1540 }
1541
1542 Link_map *map;
1543 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1544 if (map == NULL) {
1545 dlclose(handle);
1546 return 1;
1547 }
1548
1549 while (map->l_prev != NULL) {
1550 map = map->l_prev;
1551 }
1552
1553 while (map != NULL) {
1554 // Iterate through all map entries and call callback with fields of interest
1555 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1556 dlclose(handle);
1557 return 1;
1558 }
1559 map = map->l_next;
1560 }
1561
1562 dlclose(handle);
1563 return 0;
1564 }
1565
1566 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1567 outputStream * out = (outputStream *) param;
1568 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1569 return 0;
1570 }
1571
1572 void os::print_dll_info(outputStream * st) {
1573 st->print_cr("Dynamic libraries:"); st->flush();
1574 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1575 st->print_cr("Error: Cannot print dynamic libraries.");
1576 }
1577 }
1578
1579 // Loads .dll/.so and
1580 // in case of error it checks if .dll/.so was built for the
1581 // same architecture as Hotspot is running on
1582
1583 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1584 void * result= ::dlopen(filename, RTLD_LAZY);
1585 if (result != NULL) {
1586 // Successful loading
1587 return result;
1588 }
1589
1590 Elf32_Ehdr elf_head;
1591
1592 // Read system error message into ebuf
1593 // It may or may not be overwritten below
1594 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1595 ebuf[ebuflen-1]='\0';
1596 int diag_msg_max_length=ebuflen-strlen(ebuf);
1597 char* diag_msg_buf=ebuf+strlen(ebuf);
1598
1599 if (diag_msg_max_length==0) {
1600 // No more space in ebuf for additional diagnostics message
1601 return NULL;
1602 }
1603
1604 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1605
1606 if (file_descriptor < 0) {
1607 // Can't open library, report dlerror() message
1608 return NULL;
1609 }
1610
1611 bool failed_to_read_elf_head=
1612 (sizeof(elf_head) !=
1613 (::read(file_descriptor, &elf_head, sizeof(elf_head))));
1614
1615 ::close(file_descriptor);
1616 if (failed_to_read_elf_head) {
1617 // file i/o error - report dlerror() msg
1618 return NULL;
1619 }
1620
1621 typedef struct {
1622 Elf32_Half code; // Actual value as defined in elf.h
1623 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1624 char elf_class; // 32 or 64 bit
1625 char endianess; // MSB or LSB
1626 char* name; // String representation
1627 } arch_t;
1628
1629 static const arch_t arch_array[]={
1630 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1631 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1632 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1633 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1634 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1635 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1636 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1637 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1638 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1639 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1640 };
1641
1642 #if (defined IA32)
1643 static Elf32_Half running_arch_code=EM_386;
1644 #elif (defined AMD64)
1645 static Elf32_Half running_arch_code=EM_X86_64;
1646 #elif (defined IA64)
1647 static Elf32_Half running_arch_code=EM_IA_64;
1648 #elif (defined __sparc) && (defined _LP64)
1649 static Elf32_Half running_arch_code=EM_SPARCV9;
1650 #elif (defined __sparc) && (!defined _LP64)
1651 static Elf32_Half running_arch_code=EM_SPARC;
1652 #elif (defined __powerpc64__)
1653 static Elf32_Half running_arch_code=EM_PPC64;
1654 #elif (defined __powerpc__)
1655 static Elf32_Half running_arch_code=EM_PPC;
1656 #elif (defined ARM)
1657 static Elf32_Half running_arch_code=EM_ARM;
1658 #else
1659 #error Method os::dll_load requires that one of following is defined:\
1660 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1661 #endif
1662
1663 // Identify compatability class for VM's architecture and library's architecture
1664 // Obtain string descriptions for architectures
1665
1666 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1667 int running_arch_index=-1;
1668
1669 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1670 if (running_arch_code == arch_array[i].code) {
1671 running_arch_index = i;
1672 }
1673 if (lib_arch.code == arch_array[i].code) {
1674 lib_arch.compat_class = arch_array[i].compat_class;
1675 lib_arch.name = arch_array[i].name;
1676 }
1677 }
1678
1679 assert(running_arch_index != -1,
1680 "Didn't find running architecture code (running_arch_code) in arch_array");
1681 if (running_arch_index == -1) {
1682 // Even though running architecture detection failed
1683 // we may still continue with reporting dlerror() message
1684 return NULL;
1685 }
1686
1687 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1688 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1689 return NULL;
1690 }
1691
1692 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1693 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1694 return NULL;
1695 }
1696
1697 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1698 if (lib_arch.name!=NULL) {
1699 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1700 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1701 lib_arch.name, arch_array[running_arch_index].name);
1702 } else {
1703 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1704 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1705 lib_arch.code,
1706 arch_array[running_arch_index].name);
1707 }
1708 }
1709
1710 return NULL;
1711 }
1712
1713 void* os::dll_lookup(void* handle, const char* name) {
1714 return dlsym(handle, name);
1715 }
1716
1717 void* os::get_default_process_handle() {
1718 return (void*)::dlopen(NULL, RTLD_LAZY);
1719 }
1720
1721 int os::stat(const char *path, struct stat *sbuf) {
1722 char pathbuf[MAX_PATH];
1723 if (strlen(path) > MAX_PATH - 1) {
1724 errno = ENAMETOOLONG;
1725 return -1;
1726 }
1727 os::native_path(strcpy(pathbuf, path));
1728 return ::stat(pathbuf, sbuf);
1729 }
1730
1731 static inline time_t get_mtime(const char* filename) {
1732 struct stat st;
1733 int ret = os::stat(filename, &st);
1734 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1735 return st.st_mtime;
1736 }
1737
1738 int os::compare_file_modified_times(const char* file1, const char* file2) {
1739 time_t t1 = get_mtime(file1);
1740 time_t t2 = get_mtime(file2);
1741 return t1 - t2;
1742 }
1743
1744 static bool _print_ascii_file(const char* filename, outputStream* st) {
1745 int fd = ::open(filename, O_RDONLY);
1746 if (fd == -1) {
1747 return false;
1748 }
1749
1750 char buf[32];
1751 int bytes;
1752 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1753 st->print_raw(buf, bytes);
1754 }
1755
1756 ::close(fd);
1757
1758 return true;
1759 }
1760
1761 void os::print_os_info_brief(outputStream* st) {
1762 os::Solaris::print_distro_info(st);
1763
1764 os::Posix::print_uname_info(st);
1765
1766 os::Solaris::print_libversion_info(st);
1767 }
1768
1769 void os::print_os_info(outputStream* st) {
1770 st->print("OS:");
1771
1772 os::Solaris::print_distro_info(st);
1773
1774 os::Posix::print_uname_info(st);
1775
1776 os::Solaris::print_libversion_info(st);
1777
1778 os::Posix::print_rlimit_info(st);
1779
1780 os::Posix::print_load_average(st);
1781 }
1782
1783 void os::Solaris::print_distro_info(outputStream* st) {
1784 if (!_print_ascii_file("/etc/release", st)) {
1785 st->print("Solaris");
1786 }
1787 st->cr();
1788 }
1789
1790 void os::get_summary_os_info(char* buf, size_t buflen) {
1791 strncpy(buf, "Solaris", buflen); // default to plain solaris
1792 FILE* fp = fopen("/etc/release", "r");
1793 if (fp != NULL) {
1794 char tmp[256];
1795 // Only get the first line and chop out everything but the os name.
1796 if (fgets(tmp, sizeof(tmp), fp)) {
1797 char* ptr = tmp;
1798 // skip past whitespace characters
1799 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1800 if (*ptr != '\0') {
1801 char* nl = strchr(ptr, '\n');
1802 if (nl != NULL) *nl = '\0';
1803 strncpy(buf, ptr, buflen);
1804 }
1805 }
1806 fclose(fp);
1807 }
1808 }
1809
1810 void os::Solaris::print_libversion_info(outputStream* st) {
1811 st->print(" (T2 libthread)");
1812 st->cr();
1813 }
1814
1815 static bool check_addr0(outputStream* st) {
1816 jboolean status = false;
1817 const int read_chunk = 200;
1818 int ret = 0;
1819 int nmap = 0;
1820 int fd = ::open("/proc/self/map",O_RDONLY);
1821 if (fd >= 0) {
1822 prmap_t *p = NULL;
1823 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1824 if (NULL == mbuff) {
1825 ::close(fd);
1826 return status;
1827 }
1828 while ((ret = ::read(fd, mbuff, read_chunk * sizeof(prmap_t))) > 0) {
1829 //check if read() has not read partial data
1830 if( 0 != ret % sizeof(prmap_t)){
1831 break;
1832 }
1833 nmap = ret / sizeof(prmap_t);
1834 p = (prmap_t *)mbuff;
1835 for(int i = 0; i < nmap; i++){
1836 if (p->pr_vaddr == 0x0) {
1837 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1838 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1839 st->print("Access: ");
1840 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1841 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1842 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1843 st->cr();
1844 status = true;
1845 }
1846 p++;
1847 }
1848 }
1849 free(mbuff);
1850 ::close(fd);
1851 }
1852 return status;
1853 }
1854
1855 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1856 // Get MHz with system call. We don't seem to already have this.
1857 processor_info_t stats;
1858 processorid_t id = getcpuid();
1859 int clock = 0;
1860 if (processor_info(id, &stats) != -1) {
1861 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1862 }
1863 #ifdef AMD64
1864 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1865 #else
1866 // must be sparc
1867 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1868 #endif
1869 }
1870
1871 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1872 // Nothing to do for now.
1873 }
1874
1875 void os::print_memory_info(outputStream* st) {
1876 st->print("Memory:");
1877 st->print(" %dk page", os::vm_page_size()>>10);
1878 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1879 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1880 st->cr();
1881 (void) check_addr0(st);
1882 }
1883
1884 // Moved from whole group, because we need them here for diagnostic
1885 // prints.
1886 static int Maxsignum = 0;
1887 static int *ourSigFlags = NULL;
1888
1889 int os::Solaris::get_our_sigflags(int sig) {
1890 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1891 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1892 return ourSigFlags[sig];
1893 }
1894
1895 void os::Solaris::set_our_sigflags(int sig, int flags) {
1896 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1897 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1898 ourSigFlags[sig] = flags;
1899 }
1900
1901
1902 static const char* get_signal_handler_name(address handler,
1903 char* buf, int buflen) {
1904 int offset;
1905 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1906 if (found) {
1907 // skip directory names
1908 const char *p1, *p2;
1909 p1 = buf;
1910 size_t len = strlen(os::file_separator());
1911 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1912 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1913 } else {
1914 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1915 }
1916 return buf;
1917 }
1918
1919 static void print_signal_handler(outputStream* st, int sig,
1920 char* buf, size_t buflen) {
1921 struct sigaction sa;
1922
1923 sigaction(sig, NULL, &sa);
1924
1925 st->print("%s: ", os::exception_name(sig, buf, buflen));
1926
1927 address handler = (sa.sa_flags & SA_SIGINFO)
1928 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1929 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1930
1931 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1932 st->print("SIG_DFL");
1933 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1934 st->print("SIG_IGN");
1935 } else {
1936 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1937 }
1938
1939 st->print(", sa_mask[0]=");
1940 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1941
1942 address rh = VMError::get_resetted_sighandler(sig);
1943 // May be, handler was resetted by VMError?
1944 if (rh != NULL) {
1945 handler = rh;
1946 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1947 }
1948
1949 st->print(", sa_flags=");
1950 os::Posix::print_sa_flags(st, sa.sa_flags);
1951
1952 // Check: is it our handler?
1953 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1954 // It is our signal handler
1955 // check for flags
1956 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1957 st->print(
1958 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1959 os::Solaris::get_our_sigflags(sig));
1960 }
1961 }
1962 st->cr();
1963 }
1964
1965 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1966 st->print_cr("Signal Handlers:");
1967 print_signal_handler(st, SIGSEGV, buf, buflen);
1968 print_signal_handler(st, SIGBUS , buf, buflen);
1969 print_signal_handler(st, SIGFPE , buf, buflen);
1970 print_signal_handler(st, SIGPIPE, buf, buflen);
1971 print_signal_handler(st, SIGXFSZ, buf, buflen);
1972 print_signal_handler(st, SIGILL , buf, buflen);
1973 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1974 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1975 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1976 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1977 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1978 }
1979
1980 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1981
1982 // Find the full path to the current module, libjvm.so
1983 void os::jvm_path(char *buf, jint buflen) {
1984 // Error checking.
1985 if (buflen < MAXPATHLEN) {
1986 assert(false, "must use a large-enough buffer");
1987 buf[0] = '\0';
1988 return;
1989 }
1990 // Lazy resolve the path to current module.
1991 if (saved_jvm_path[0] != 0) {
1992 strcpy(buf, saved_jvm_path);
1993 return;
1994 }
1995
1996 Dl_info dlinfo;
1997 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1998 assert(ret != 0, "cannot locate libjvm");
1999 if (ret != 0 && dlinfo.dli_fname != NULL) {
2000 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2001 return;
2002 }
2003 } else {
2004 buf[0] = '\0';
2005 return;
2006 }
2007
2008 if (Arguments::sun_java_launcher_is_altjvm()) {
2009 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2010 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2011 // If "/jre/lib/" appears at the right place in the string, then
2012 // assume we are installed in a JDK and we're done. Otherwise, check
2013 // for a JAVA_HOME environment variable and fix up the path so it
2014 // looks like libjvm.so is installed there (append a fake suffix
2015 // hotspot/libjvm.so).
2016 const char *p = buf + strlen(buf) - 1;
2017 for (int count = 0; p > buf && count < 5; ++count) {
2018 for (--p; p > buf && *p != '/'; --p)
2019 /* empty */ ;
2020 }
2021
2022 if (strncmp(p, "/jre/lib/", 9) != 0) {
2023 // Look for JAVA_HOME in the environment.
2024 char* java_home_var = ::getenv("JAVA_HOME");
2025 if (java_home_var != NULL && java_home_var[0] != 0) {
2026 char* jrelib_p;
2027 int len;
2028
2029 // Check the current module name "libjvm.so".
2030 p = strrchr(buf, '/');
2031 assert(strstr(p, "/libjvm") == p, "invalid library name");
2032
2033 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
2034 return;
2035 }
2036 // determine if this is a legacy image or modules image
2037 // modules image doesn't have "jre" subdirectory
2038 len = strlen(buf);
2039 assert(len < buflen, "Ran out of buffer space");
2040 jrelib_p = buf + len;
2041 snprintf(jrelib_p, buflen-len, "/jre/lib");
2042 if (0 != access(buf, F_OK)) {
2043 snprintf(jrelib_p, buflen-len, "/lib");
2044 }
2045
2046 if (0 == access(buf, F_OK)) {
2047 // Use current module name "libjvm.so"
2048 len = strlen(buf);
2049 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2050 } else {
2051 // Go back to path of .so
2052 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2053 return;
2054 }
2055 }
2056 }
2057 }
2058 }
2059
2060 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2061 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2062 }
2063
2064
2065 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2066 // no prefix required, not even "_"
2067 }
2068
2069
2070 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2071 // no suffix required
2072 }
2073
2074 // This method is a copy of JDK's sysGetLastErrorString
2075 // from src/solaris/hpi/src/system_md.c
2076
2077 size_t os::lasterror(char *buf, size_t len) {
2078 if (errno == 0) return 0;
2079
2080 const char *s = os::strerror(errno);
2081 size_t n = ::strlen(s);
2082 if (n >= len) {
2083 n = len - 1;
2084 }
2085 ::strncpy(buf, s, n);
2086 buf[n] = '\0';
2087 return n;
2088 }
2089
2090
2091 // sun.misc.Signal
2092
2093 extern "C" {
2094 static void UserHandler(int sig, void *siginfo, void *context) {
2095 // Ctrl-C is pressed during error reporting, likely because the error
2096 // handler fails to abort. Let VM die immediately.
2097 if (sig == SIGINT && VMError::is_error_reported()) {
2098 os::die();
2099 }
2100
2101 os::signal_notify(sig);
2102 // We do not need to reinstate the signal handler each time...
2103 }
2104 }
2105
2106 void* os::user_handler() {
2107 return CAST_FROM_FN_PTR(void*, UserHandler);
2108 }
2109
2110 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2111 struct timespec ts;
2112 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2113
2114 return ts;
2115 }
2116
2117 extern "C" {
2118 typedef void (*sa_handler_t)(int);
2119 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2120 }
2121
2122 void* os::signal(int signal_number, void* handler) {
2123 struct sigaction sigAct, oldSigAct;
2124 sigfillset(&(sigAct.sa_mask));
2125 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2126 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2127
2128 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2129 // -1 means registration failed
2130 return (void *)-1;
2131 }
2132
2133 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2134 }
2135
2136 void os::signal_raise(int signal_number) {
2137 raise(signal_number);
2138 }
2139
2140 // The following code is moved from os.cpp for making this
2141 // code platform specific, which it is by its very nature.
2142
2143 // a counter for each possible signal value
2144 static int Sigexit = 0;
2145 static jint *pending_signals = NULL;
2146 static int *preinstalled_sigs = NULL;
2147 static struct sigaction *chainedsigactions = NULL;
2148 static sema_t sig_sem;
2149 typedef int (*version_getting_t)();
2150 version_getting_t os::Solaris::get_libjsig_version = NULL;
2151
2152 int os::sigexitnum_pd() {
2153 assert(Sigexit > 0, "signal memory not yet initialized");
2154 return Sigexit;
2155 }
2156
2157 void os::Solaris::init_signal_mem() {
2158 // Initialize signal structures
2159 Maxsignum = SIGRTMAX;
2160 Sigexit = Maxsignum+1;
2161 assert(Maxsignum >0, "Unable to obtain max signal number");
2162
2163 // pending_signals has one int per signal
2164 // The additional signal is for SIGEXIT - exit signal to signal_thread
2165 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2166 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2167
2168 if (UseSignalChaining) {
2169 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2170 * (Maxsignum + 1), mtInternal);
2171 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2172 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2173 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2174 }
2175 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2176 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2177 }
2178
2179 void os::signal_init_pd() {
2180 int ret;
2181
2182 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2183 assert(ret == 0, "sema_init() failed");
2184 }
2185
2186 void os::signal_notify(int signal_number) {
2187 int ret;
2188
2189 Atomic::inc(&pending_signals[signal_number]);
2190 ret = ::sema_post(&sig_sem);
2191 assert(ret == 0, "sema_post() failed");
2192 }
2193
2194 static int check_pending_signals(bool wait_for_signal) {
2195 int ret;
2196 while (true) {
2197 for (int i = 0; i < Sigexit + 1; i++) {
2198 jint n = pending_signals[i];
2199 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2200 return i;
2201 }
2202 }
2203 if (!wait_for_signal) {
2204 return -1;
2205 }
2206 JavaThread *thread = JavaThread::current();
2207 ThreadBlockInVM tbivm(thread);
2208
2209 bool threadIsSuspended;
2210 do {
2211 thread->set_suspend_equivalent();
2212 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2213 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2214 ;
2215 assert(ret == 0, "sema_wait() failed");
2216
2217 // were we externally suspended while we were waiting?
2218 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2219 if (threadIsSuspended) {
2220 // The semaphore has been incremented, but while we were waiting
2221 // another thread suspended us. We don't want to continue running
2222 // while suspended because that would surprise the thread that
2223 // suspended us.
2224 ret = ::sema_post(&sig_sem);
2225 assert(ret == 0, "sema_post() failed");
2226
2227 thread->java_suspend_self();
2228 }
2229 } while (threadIsSuspended);
2230 }
2231 }
2232
2233 int os::signal_lookup() {
2234 return check_pending_signals(false);
2235 }
2236
2237 int os::signal_wait() {
2238 return check_pending_signals(true);
2239 }
2240
2241 ////////////////////////////////////////////////////////////////////////////////
2242 // Virtual Memory
2243
2244 static int page_size = -1;
2245
2246 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2247 // clear this var if support is not available.
2248 static bool has_map_align = true;
2249
2250 int os::vm_page_size() {
2251 assert(page_size != -1, "must call os::init");
2252 return page_size;
2253 }
2254
2255 // Solaris allocates memory by pages.
2256 int os::vm_allocation_granularity() {
2257 assert(page_size != -1, "must call os::init");
2258 return page_size;
2259 }
2260
2261 static bool recoverable_mmap_error(int err) {
2262 // See if the error is one we can let the caller handle. This
2263 // list of errno values comes from the Solaris mmap(2) man page.
2264 switch (err) {
2265 case EBADF:
2266 case EINVAL:
2267 case ENOTSUP:
2268 // let the caller deal with these errors
2269 return true;
2270
2271 default:
2272 // Any remaining errors on this OS can cause our reserved mapping
2273 // to be lost. That can cause confusion where different data
2274 // structures think they have the same memory mapped. The worst
2275 // scenario is if both the VM and a library think they have the
2276 // same memory mapped.
2277 return false;
2278 }
2279 }
2280
2281 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2282 int err) {
2283 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2284 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2285 os::strerror(err), err);
2286 }
2287
2288 static void warn_fail_commit_memory(char* addr, size_t bytes,
2289 size_t alignment_hint, bool exec,
2290 int err) {
2291 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2292 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2293 alignment_hint, exec, os::strerror(err), err);
2294 }
2295
2296 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2297 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2298 size_t size = bytes;
2299 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2300 if (res != NULL) {
2301 if (UseNUMAInterleaving) {
2302 numa_make_global(addr, bytes);
2303 }
2304 return 0;
2305 }
2306
2307 int err = errno; // save errno from mmap() call in mmap_chunk()
2308
2309 if (!recoverable_mmap_error(err)) {
2310 warn_fail_commit_memory(addr, bytes, exec, err);
2311 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2312 }
2313
2314 return err;
2315 }
2316
2317 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2318 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2319 }
2320
2321 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2322 const char* mesg) {
2323 assert(mesg != NULL, "mesg must be specified");
2324 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2325 if (err != 0) {
2326 // the caller wants all commit errors to exit with the specified mesg:
2327 warn_fail_commit_memory(addr, bytes, exec, err);
2328 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2329 }
2330 }
2331
2332 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2333 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2334 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2335 alignment, (size_t) vm_page_size());
2336
2337 for (int i = 0; _page_sizes[i] != 0; i++) {
2338 if (is_size_aligned(alignment, _page_sizes[i])) {
2339 return _page_sizes[i];
2340 }
2341 }
2342
2343 return (size_t) vm_page_size();
2344 }
2345
2346 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2347 size_t alignment_hint, bool exec) {
2348 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2349 if (err == 0 && UseLargePages && alignment_hint > 0) {
2350 assert(is_size_aligned(bytes, alignment_hint),
2351 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2352
2353 // The syscall memcntl requires an exact page size (see man memcntl for details).
2354 size_t page_size = page_size_for_alignment(alignment_hint);
2355 if (page_size > (size_t) vm_page_size()) {
2356 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2357 }
2358 }
2359 return err;
2360 }
2361
2362 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2363 bool exec) {
2364 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2365 }
2366
2367 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2368 size_t alignment_hint, bool exec,
2369 const char* mesg) {
2370 assert(mesg != NULL, "mesg must be specified");
2371 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2372 if (err != 0) {
2373 // the caller wants all commit errors to exit with the specified mesg:
2374 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2375 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2376 }
2377 }
2378
2379 // Uncommit the pages in a specified region.
2380 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2381 if (madvise(addr, bytes, MADV_FREE) < 0) {
2382 debug_only(warning("MADV_FREE failed."));
2383 return;
2384 }
2385 }
2386
2387 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2388 return os::commit_memory(addr, size, !ExecMem);
2389 }
2390
2391 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2392 return os::uncommit_memory(addr, size);
2393 }
2394
2395 // Change the page size in a given range.
2396 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2397 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2398 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2399 if (UseLargePages) {
2400 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2401 if (page_size > (size_t) vm_page_size()) {
2402 Solaris::setup_large_pages(addr, bytes, page_size);
2403 }
2404 }
2405 }
2406
2407 // Tell the OS to make the range local to the first-touching LWP
2408 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2409 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2410 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2411 debug_only(warning("MADV_ACCESS_LWP failed."));
2412 }
2413 }
2414
2415 // Tell the OS that this range would be accessed from different LWPs.
2416 void os::numa_make_global(char *addr, size_t bytes) {
2417 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2418 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2419 debug_only(warning("MADV_ACCESS_MANY failed."));
2420 }
2421 }
2422
2423 // Get the number of the locality groups.
2424 size_t os::numa_get_groups_num() {
2425 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2426 return n != -1 ? n : 1;
2427 }
2428
2429 // Get a list of leaf locality groups. A leaf lgroup is group that
2430 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2431 // board. An LWP is assigned to one of these groups upon creation.
2432 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2433 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2434 ids[0] = 0;
2435 return 1;
2436 }
2437 int result_size = 0, top = 1, bottom = 0, cur = 0;
2438 for (int k = 0; k < size; k++) {
2439 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2440 (Solaris::lgrp_id_t*)&ids[top], size - top);
2441 if (r == -1) {
2442 ids[0] = 0;
2443 return 1;
2444 }
2445 if (!r) {
2446 // That's a leaf node.
2447 assert(bottom <= cur, "Sanity check");
2448 // Check if the node has memory
2449 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2450 NULL, 0, LGRP_RSRC_MEM) > 0) {
2451 ids[bottom++] = ids[cur];
2452 }
2453 }
2454 top += r;
2455 cur++;
2456 }
2457 if (bottom == 0) {
2458 // Handle a situation, when the OS reports no memory available.
2459 // Assume UMA architecture.
2460 ids[0] = 0;
2461 return 1;
2462 }
2463 return bottom;
2464 }
2465
2466 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2467 bool os::numa_topology_changed() {
2468 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2469 if (is_stale != -1 && is_stale) {
2470 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2471 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2472 assert(c != 0, "Failure to initialize LGRP API");
2473 Solaris::set_lgrp_cookie(c);
2474 return true;
2475 }
2476 return false;
2477 }
2478
2479 // Get the group id of the current LWP.
2480 int os::numa_get_group_id() {
2481 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2482 if (lgrp_id == -1) {
2483 return 0;
2484 }
2485 const int size = os::numa_get_groups_num();
2486 int *ids = (int*)alloca(size * sizeof(int));
2487
2488 // Get the ids of all lgroups with memory; r is the count.
2489 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2490 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2491 if (r <= 0) {
2492 return 0;
2493 }
2494 return ids[os::random() % r];
2495 }
2496
2497 // Request information about the page.
2498 bool os::get_page_info(char *start, page_info* info) {
2499 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2500 uint64_t addr = (uintptr_t)start;
2501 uint64_t outdata[2];
2502 uint_t validity = 0;
2503
2504 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2505 return false;
2506 }
2507
2508 info->size = 0;
2509 info->lgrp_id = -1;
2510
2511 if ((validity & 1) != 0) {
2512 if ((validity & 2) != 0) {
2513 info->lgrp_id = outdata[0];
2514 }
2515 if ((validity & 4) != 0) {
2516 info->size = outdata[1];
2517 }
2518 return true;
2519 }
2520 return false;
2521 }
2522
2523 // Scan the pages from start to end until a page different than
2524 // the one described in the info parameter is encountered.
2525 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2526 page_info* page_found) {
2527 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2528 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2529 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2530 uint_t validity[MAX_MEMINFO_CNT];
2531
2532 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2533 uint64_t p = (uint64_t)start;
2534 while (p < (uint64_t)end) {
2535 addrs[0] = p;
2536 size_t addrs_count = 1;
2537 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2538 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2539 addrs_count++;
2540 }
2541
2542 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2543 return NULL;
2544 }
2545
2546 size_t i = 0;
2547 for (; i < addrs_count; i++) {
2548 if ((validity[i] & 1) != 0) {
2549 if ((validity[i] & 4) != 0) {
2550 if (outdata[types * i + 1] != page_expected->size) {
2551 break;
2552 }
2553 } else if (page_expected->size != 0) {
2554 break;
2555 }
2556
2557 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2558 if (outdata[types * i] != page_expected->lgrp_id) {
2559 break;
2560 }
2561 }
2562 } else {
2563 return NULL;
2564 }
2565 }
2566
2567 if (i < addrs_count) {
2568 if ((validity[i] & 2) != 0) {
2569 page_found->lgrp_id = outdata[types * i];
2570 } else {
2571 page_found->lgrp_id = -1;
2572 }
2573 if ((validity[i] & 4) != 0) {
2574 page_found->size = outdata[types * i + 1];
2575 } else {
2576 page_found->size = 0;
2577 }
2578 return (char*)addrs[i];
2579 }
2580
2581 p = addrs[addrs_count - 1] + page_size;
2582 }
2583 return end;
2584 }
2585
2586 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2587 size_t size = bytes;
2588 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2589 // uncommitted page. Otherwise, the read/write might succeed if we
2590 // have enough swap space to back the physical page.
2591 return
2592 NULL != Solaris::mmap_chunk(addr, size,
2593 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2594 PROT_NONE);
2595 }
2596
2597 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2598 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2599
2600 if (b == MAP_FAILED) {
2601 return NULL;
2602 }
2603 return b;
2604 }
2605
2606 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2607 size_t alignment_hint, bool fixed) {
2608 char* addr = requested_addr;
2609 int flags = MAP_PRIVATE | MAP_NORESERVE;
2610
2611 assert(!(fixed && (alignment_hint > 0)),
2612 "alignment hint meaningless with fixed mmap");
2613
2614 if (fixed) {
2615 flags |= MAP_FIXED;
2616 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2617 flags |= MAP_ALIGN;
2618 addr = (char*) alignment_hint;
2619 }
2620
2621 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2622 // uncommitted page. Otherwise, the read/write might succeed if we
2623 // have enough swap space to back the physical page.
2624 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2625 }
2626
2627 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2628 size_t alignment_hint) {
2629 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2630 (requested_addr != NULL));
2631
2632 guarantee(requested_addr == NULL || requested_addr == addr,
2633 "OS failed to return requested mmap address.");
2634 return addr;
2635 }
2636
2637 // Reserve memory at an arbitrary address, only if that area is
2638 // available (and not reserved for something else).
2639
2640 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2641 const int max_tries = 10;
2642 char* base[max_tries];
2643 size_t size[max_tries];
2644
2645 // Solaris adds a gap between mmap'ed regions. The size of the gap
2646 // is dependent on the requested size and the MMU. Our initial gap
2647 // value here is just a guess and will be corrected later.
2648 bool had_top_overlap = false;
2649 bool have_adjusted_gap = false;
2650 size_t gap = 0x400000;
2651
2652 // Assert only that the size is a multiple of the page size, since
2653 // that's all that mmap requires, and since that's all we really know
2654 // about at this low abstraction level. If we need higher alignment,
2655 // we can either pass an alignment to this method or verify alignment
2656 // in one of the methods further up the call chain. See bug 5044738.
2657 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2658
2659 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2660 // Give it a try, if the kernel honors the hint we can return immediately.
2661 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2662
2663 volatile int err = errno;
2664 if (addr == requested_addr) {
2665 return addr;
2666 } else if (addr != NULL) {
2667 pd_unmap_memory(addr, bytes);
2668 }
2669
2670 if (log_is_enabled(Warning, os)) {
2671 char buf[256];
2672 buf[0] = '\0';
2673 if (addr == NULL) {
2674 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2675 }
2676 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2677 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2678 "%s", bytes, requested_addr, addr, buf);
2679 }
2680
2681 // Address hint method didn't work. Fall back to the old method.
2682 // In theory, once SNV becomes our oldest supported platform, this
2683 // code will no longer be needed.
2684 //
2685 // Repeatedly allocate blocks until the block is allocated at the
2686 // right spot. Give up after max_tries.
2687 int i;
2688 for (i = 0; i < max_tries; ++i) {
2689 base[i] = reserve_memory(bytes);
2690
2691 if (base[i] != NULL) {
2692 // Is this the block we wanted?
2693 if (base[i] == requested_addr) {
2694 size[i] = bytes;
2695 break;
2696 }
2697
2698 // check that the gap value is right
2699 if (had_top_overlap && !have_adjusted_gap) {
2700 size_t actual_gap = base[i-1] - base[i] - bytes;
2701 if (gap != actual_gap) {
2702 // adjust the gap value and retry the last 2 allocations
2703 assert(i > 0, "gap adjustment code problem");
2704 have_adjusted_gap = true; // adjust the gap only once, just in case
2705 gap = actual_gap;
2706 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2707 unmap_memory(base[i], bytes);
2708 unmap_memory(base[i-1], size[i-1]);
2709 i-=2;
2710 continue;
2711 }
2712 }
2713
2714 // Does this overlap the block we wanted? Give back the overlapped
2715 // parts and try again.
2716 //
2717 // There is still a bug in this code: if top_overlap == bytes,
2718 // the overlap is offset from requested region by the value of gap.
2719 // In this case giving back the overlapped part will not work,
2720 // because we'll give back the entire block at base[i] and
2721 // therefore the subsequent allocation will not generate a new gap.
2722 // This could be fixed with a new algorithm that used larger
2723 // or variable size chunks to find the requested region -
2724 // but such a change would introduce additional complications.
2725 // It's rare enough that the planets align for this bug,
2726 // so we'll just wait for a fix for 6204603/5003415 which
2727 // will provide a mmap flag to allow us to avoid this business.
2728
2729 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2730 if (top_overlap >= 0 && top_overlap < bytes) {
2731 had_top_overlap = true;
2732 unmap_memory(base[i], top_overlap);
2733 base[i] += top_overlap;
2734 size[i] = bytes - top_overlap;
2735 } else {
2736 size_t bottom_overlap = base[i] + bytes - requested_addr;
2737 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2738 if (bottom_overlap == 0) {
2739 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2740 }
2741 unmap_memory(requested_addr, bottom_overlap);
2742 size[i] = bytes - bottom_overlap;
2743 } else {
2744 size[i] = bytes;
2745 }
2746 }
2747 }
2748 }
2749
2750 // Give back the unused reserved pieces.
2751
2752 for (int j = 0; j < i; ++j) {
2753 if (base[j] != NULL) {
2754 unmap_memory(base[j], size[j]);
2755 }
2756 }
2757
2758 return (i < max_tries) ? requested_addr : NULL;
2759 }
2760
2761 bool os::pd_release_memory(char* addr, size_t bytes) {
2762 size_t size = bytes;
2763 return munmap(addr, size) == 0;
2764 }
2765
2766 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2767 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2768 "addr must be page aligned");
2769 int retVal = mprotect(addr, bytes, prot);
2770 return retVal == 0;
2771 }
2772
2773 // Protect memory (Used to pass readonly pages through
2774 // JNI GetArray<type>Elements with empty arrays.)
2775 // Also, used for serialization page and for compressed oops null pointer
2776 // checking.
2777 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2778 bool is_committed) {
2779 unsigned int p = 0;
2780 switch (prot) {
2781 case MEM_PROT_NONE: p = PROT_NONE; break;
2782 case MEM_PROT_READ: p = PROT_READ; break;
2783 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2784 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2785 default:
2786 ShouldNotReachHere();
2787 }
2788 // is_committed is unused.
2789 return solaris_mprotect(addr, bytes, p);
2790 }
2791
2792 // guard_memory and unguard_memory only happens within stack guard pages.
2793 // Since ISM pertains only to the heap, guard and unguard memory should not
2794 /// happen with an ISM region.
2795 bool os::guard_memory(char* addr, size_t bytes) {
2796 return solaris_mprotect(addr, bytes, PROT_NONE);
2797 }
2798
2799 bool os::unguard_memory(char* addr, size_t bytes) {
2800 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2801 }
2802
2803 // Large page support
2804 static size_t _large_page_size = 0;
2805
2806 // Insertion sort for small arrays (descending order).
2807 static void insertion_sort_descending(size_t* array, int len) {
2808 for (int i = 0; i < len; i++) {
2809 size_t val = array[i];
2810 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2811 size_t tmp = array[key];
2812 array[key] = array[key - 1];
2813 array[key - 1] = tmp;
2814 }
2815 }
2816 }
2817
2818 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2819 const unsigned int usable_count = VM_Version::page_size_count();
2820 if (usable_count == 1) {
2821 return false;
2822 }
2823
2824 // Find the right getpagesizes interface. When solaris 11 is the minimum
2825 // build platform, getpagesizes() (without the '2') can be called directly.
2826 typedef int (*gps_t)(size_t[], int);
2827 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2828 if (gps_func == NULL) {
2829 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2830 if (gps_func == NULL) {
2831 if (warn) {
2832 warning("MPSS is not supported by the operating system.");
2833 }
2834 return false;
2835 }
2836 }
2837
2838 // Fill the array of page sizes.
2839 int n = (*gps_func)(_page_sizes, page_sizes_max);
2840 assert(n > 0, "Solaris bug?");
2841
2842 if (n == page_sizes_max) {
2843 // Add a sentinel value (necessary only if the array was completely filled
2844 // since it is static (zeroed at initialization)).
2845 _page_sizes[--n] = 0;
2846 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2847 }
2848 assert(_page_sizes[n] == 0, "missing sentinel");
2849 trace_page_sizes("available page sizes", _page_sizes, n);
2850
2851 if (n == 1) return false; // Only one page size available.
2852
2853 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2854 // select up to usable_count elements. First sort the array, find the first
2855 // acceptable value, then copy the usable sizes to the top of the array and
2856 // trim the rest. Make sure to include the default page size :-).
2857 //
2858 // A better policy could get rid of the 4M limit by taking the sizes of the
2859 // important VM memory regions (java heap and possibly the code cache) into
2860 // account.
2861 insertion_sort_descending(_page_sizes, n);
2862 const size_t size_limit =
2863 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2864 int beg;
2865 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2866 const int end = MIN2((int)usable_count, n) - 1;
2867 for (int cur = 0; cur < end; ++cur, ++beg) {
2868 _page_sizes[cur] = _page_sizes[beg];
2869 }
2870 _page_sizes[end] = vm_page_size();
2871 _page_sizes[end + 1] = 0;
2872
2873 if (_page_sizes[end] > _page_sizes[end - 1]) {
2874 // Default page size is not the smallest; sort again.
2875 insertion_sort_descending(_page_sizes, end + 1);
2876 }
2877 *page_size = _page_sizes[0];
2878
2879 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2880 return true;
2881 }
2882
2883 void os::large_page_init() {
2884 if (UseLargePages) {
2885 // print a warning if any large page related flag is specified on command line
2886 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2887 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2888
2889 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2890 }
2891 }
2892
2893 bool os::Solaris::is_valid_page_size(size_t bytes) {
2894 for (int i = 0; _page_sizes[i] != 0; i++) {
2895 if (_page_sizes[i] == bytes) {
2896 return true;
2897 }
2898 }
2899 return false;
2900 }
2901
2902 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2903 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2904 assert(is_ptr_aligned((void*) start, align),
2905 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2906 assert(is_size_aligned(bytes, align),
2907 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2908
2909 // Signal to OS that we want large pages for addresses
2910 // from addr, addr + bytes
2911 struct memcntl_mha mpss_struct;
2912 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2913 mpss_struct.mha_pagesize = align;
2914 mpss_struct.mha_flags = 0;
2915 // Upon successful completion, memcntl() returns 0
2916 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2917 debug_only(warning("Attempt to use MPSS failed."));
2918 return false;
2919 }
2920 return true;
2921 }
2922
2923 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2924 fatal("os::reserve_memory_special should not be called on Solaris.");
2925 return NULL;
2926 }
2927
2928 bool os::release_memory_special(char* base, size_t bytes) {
2929 fatal("os::release_memory_special should not be called on Solaris.");
2930 return false;
2931 }
2932
2933 size_t os::large_page_size() {
2934 return _large_page_size;
2935 }
2936
2937 // MPSS allows application to commit large page memory on demand; with ISM
2938 // the entire memory region must be allocated as shared memory.
2939 bool os::can_commit_large_page_memory() {
2940 return true;
2941 }
2942
2943 bool os::can_execute_large_page_memory() {
2944 return true;
2945 }
2946
2947 // Read calls from inside the vm need to perform state transitions
2948 ssize_t os::read(int fd, void *buf, unsigned int nBytes) {
2949 ssize_t res;
2950 JavaThread* thread = (JavaThread*)Thread::current();
2951 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2952 ThreadBlockInVM tbiv(thread);
2953 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2954 return res;
2955 }
2956
2957 ssize_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2958 ssize_t res;
2959 JavaThread* thread = (JavaThread*)Thread::current();
2960 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2961 ThreadBlockInVM tbiv(thread);
2962 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
2963 return res;
2964 }
2965
2966 ssize_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
2967 ssize_t res;
2968 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
2969 "Assumed _thread_in_native");
2970 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2971 return res;
2972 }
2973
2974 ssize_t os::write(int fd, const void *buf, unsigned int nBytes) {
2975 ssize_t res;
2976 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
2977 return res;
2978 }
2979
2980 void os::naked_short_sleep(jlong ms) {
2981 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2982
2983 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
2984 // Solaris requires -lrt for this.
2985 usleep((ms * 1000));
2986
2987 return;
2988 }
2989
2990 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2991 void os::infinite_sleep() {
2992 while (true) { // sleep forever ...
2993 ::sleep(100); // ... 100 seconds at a time
2994 }
2995 }
2996
2997 // Used to convert frequent JVM_Yield() to nops
2998 bool os::dont_yield() {
2999 if (DontYieldALot) {
3000 static hrtime_t last_time = 0;
3001 hrtime_t diff = getTimeNanos() - last_time;
3002
3003 if (diff < DontYieldALotInterval * 1000000) {
3004 return true;
3005 }
3006
3007 last_time += diff;
3008
3009 return false;
3010 } else {
3011 return false;
3012 }
3013 }
3014
3015 // Note that yield semantics are defined by the scheduling class to which
3016 // the thread currently belongs. Typically, yield will _not yield to
3017 // other equal or higher priority threads that reside on the dispatch queues
3018 // of other CPUs.
3019
3020 void os::naked_yield() {
3021 thr_yield();
3022 }
3023
3024 // Interface for setting lwp priorities. We are using T2 libthread,
3025 // which forces the use of bound threads, so all of our threads will
3026 // be assigned to real lwp's. Using the thr_setprio function is
3027 // meaningless in this mode so we must adjust the real lwp's priority.
3028 // The routines below implement the getting and setting of lwp priorities.
3029 //
3030 // Note: There are three priority scales used on Solaris. Java priotities
3031 // which range from 1 to 10, libthread "thr_setprio" scale which range
3032 // from 0 to 127, and the current scheduling class of the process we
3033 // are running in. This is typically from -60 to +60.
3034 // The setting of the lwp priorities in done after a call to thr_setprio
3035 // so Java priorities are mapped to libthread priorities and we map from
3036 // the latter to lwp priorities. We don't keep priorities stored in
3037 // Java priorities since some of our worker threads want to set priorities
3038 // higher than all Java threads.
3039 //
3040 // For related information:
3041 // (1) man -s 2 priocntl
3042 // (2) man -s 4 priocntl
3043 // (3) man dispadmin
3044 // = librt.so
3045 // = libthread/common/rtsched.c - thrp_setlwpprio().
3046 // = ps -cL <pid> ... to validate priority.
3047 // = sched_get_priority_min and _max
3048 // pthread_create
3049 // sched_setparam
3050 // pthread_setschedparam
3051 //
3052 // Assumptions:
3053 // + We assume that all threads in the process belong to the same
3054 // scheduling class. IE. an homogenous process.
3055 // + Must be root or in IA group to change change "interactive" attribute.
3056 // Priocntl() will fail silently. The only indication of failure is when
3057 // we read-back the value and notice that it hasn't changed.
3058 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3059 // + For RT, change timeslice as well. Invariant:
3060 // constant "priority integral"
3061 // Konst == TimeSlice * (60-Priority)
3062 // Given a priority, compute appropriate timeslice.
3063 // + Higher numerical values have higher priority.
3064
3065 // sched class attributes
3066 typedef struct {
3067 int schedPolicy; // classID
3068 int maxPrio;
3069 int minPrio;
3070 } SchedInfo;
3071
3072
3073 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3074
3075 #ifdef ASSERT
3076 static int ReadBackValidate = 1;
3077 #endif
3078 static int myClass = 0;
3079 static int myMin = 0;
3080 static int myMax = 0;
3081 static int myCur = 0;
3082 static bool priocntl_enable = false;
3083
3084 static const int criticalPrio = FXCriticalPriority;
3085 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3086
3087
3088 // lwp_priocntl_init
3089 //
3090 // Try to determine the priority scale for our process.
3091 //
3092 // Return errno or 0 if OK.
3093 //
3094 static int lwp_priocntl_init() {
3095 int rslt;
3096 pcinfo_t ClassInfo;
3097 pcparms_t ParmInfo;
3098 int i;
3099
3100 if (!UseThreadPriorities) return 0;
3101
3102 // If ThreadPriorityPolicy is 1, switch tables
3103 if (ThreadPriorityPolicy == 1) {
3104 for (i = 0; i < CriticalPriority+1; i++)
3105 os::java_to_os_priority[i] = prio_policy1[i];
3106 }
3107 if (UseCriticalJavaThreadPriority) {
3108 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3109 // See set_native_priority() and set_lwp_class_and_priority().
3110 // Save original MaxPriority mapping in case attempt to
3111 // use critical priority fails.
3112 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3113 // Set negative to distinguish from other priorities
3114 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3115 }
3116
3117 // Get IDs for a set of well-known scheduling classes.
3118 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3119 // the system. We should have a loop that iterates over the
3120 // classID values, which are known to be "small" integers.
3121
3122 strcpy(ClassInfo.pc_clname, "TS");
3123 ClassInfo.pc_cid = -1;
3124 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3125 if (rslt < 0) return errno;
3126 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3127 tsLimits.schedPolicy = ClassInfo.pc_cid;
3128 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3129 tsLimits.minPrio = -tsLimits.maxPrio;
3130
3131 strcpy(ClassInfo.pc_clname, "IA");
3132 ClassInfo.pc_cid = -1;
3133 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3134 if (rslt < 0) return errno;
3135 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3136 iaLimits.schedPolicy = ClassInfo.pc_cid;
3137 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3138 iaLimits.minPrio = -iaLimits.maxPrio;
3139
3140 strcpy(ClassInfo.pc_clname, "RT");
3141 ClassInfo.pc_cid = -1;
3142 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3143 if (rslt < 0) return errno;
3144 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3145 rtLimits.schedPolicy = ClassInfo.pc_cid;
3146 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3147 rtLimits.minPrio = 0;
3148
3149 strcpy(ClassInfo.pc_clname, "FX");
3150 ClassInfo.pc_cid = -1;
3151 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3152 if (rslt < 0) return errno;
3153 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3154 fxLimits.schedPolicy = ClassInfo.pc_cid;
3155 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3156 fxLimits.minPrio = 0;
3157
3158 // Query our "current" scheduling class.
3159 // This will normally be IA, TS or, rarely, FX or RT.
3160 memset(&ParmInfo, 0, sizeof(ParmInfo));
3161 ParmInfo.pc_cid = PC_CLNULL;
3162 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3163 if (rslt < 0) return errno;
3164 myClass = ParmInfo.pc_cid;
3165
3166 // We now know our scheduling classId, get specific information
3167 // about the class.
3168 ClassInfo.pc_cid = myClass;
3169 ClassInfo.pc_clname[0] = 0;
3170 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3171 if (rslt < 0) return errno;
3172
3173 if (ThreadPriorityVerbose) {
3174 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3175 }
3176
3177 memset(&ParmInfo, 0, sizeof(pcparms_t));
3178 ParmInfo.pc_cid = PC_CLNULL;
3179 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3180 if (rslt < 0) return errno;
3181
3182 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3183 myMin = rtLimits.minPrio;
3184 myMax = rtLimits.maxPrio;
3185 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3186 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3187 myMin = iaLimits.minPrio;
3188 myMax = iaLimits.maxPrio;
3189 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3190 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3191 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3192 myMin = tsLimits.minPrio;
3193 myMax = tsLimits.maxPrio;
3194 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3195 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3196 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3197 myMin = fxLimits.minPrio;
3198 myMax = fxLimits.maxPrio;
3199 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3200 } else {
3201 // No clue - punt
3202 if (ThreadPriorityVerbose) {
3203 tty->print_cr("Unknown scheduling class: %s ... \n",
3204 ClassInfo.pc_clname);
3205 }
3206 return EINVAL; // no clue, punt
3207 }
3208
3209 if (ThreadPriorityVerbose) {
3210 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3211 }
3212
3213 priocntl_enable = true; // Enable changing priorities
3214 return 0;
3215 }
3216
3217 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3218 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3219 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3220 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3221
3222
3223 // scale_to_lwp_priority
3224 //
3225 // Convert from the libthread "thr_setprio" scale to our current
3226 // lwp scheduling class scale.
3227 //
3228 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3229 int v;
3230
3231 if (x == 127) return rMax; // avoid round-down
3232 v = (((x*(rMax-rMin)))/128)+rMin;
3233 return v;
3234 }
3235
3236
3237 // set_lwp_class_and_priority
3238 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3239 int newPrio, int new_class, bool scale) {
3240 int rslt;
3241 int Actual, Expected, prv;
3242 pcparms_t ParmInfo; // for GET-SET
3243 #ifdef ASSERT
3244 pcparms_t ReadBack; // for readback
3245 #endif
3246
3247 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3248 // Query current values.
3249 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3250 // Cache "pcparms_t" in global ParmCache.
3251 // TODO: elide set-to-same-value
3252
3253 // If something went wrong on init, don't change priorities.
3254 if (!priocntl_enable) {
3255 if (ThreadPriorityVerbose) {
3256 tty->print_cr("Trying to set priority but init failed, ignoring");
3257 }
3258 return EINVAL;
3259 }
3260
3261 // If lwp hasn't started yet, just return
3262 // the _start routine will call us again.
3263 if (lwpid <= 0) {
3264 if (ThreadPriorityVerbose) {
3265 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3266 INTPTR_FORMAT " to %d, lwpid not set",
3267 ThreadID, newPrio);
3268 }
3269 return 0;
3270 }
3271
3272 if (ThreadPriorityVerbose) {
3273 tty->print_cr ("set_lwp_class_and_priority("
3274 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3275 ThreadID, lwpid, newPrio);
3276 }
3277
3278 memset(&ParmInfo, 0, sizeof(pcparms_t));
3279 ParmInfo.pc_cid = PC_CLNULL;
3280 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3281 if (rslt < 0) return errno;
3282
3283 int cur_class = ParmInfo.pc_cid;
3284 ParmInfo.pc_cid = (id_t)new_class;
3285
3286 if (new_class == rtLimits.schedPolicy) {
3287 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3288 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3289 rtLimits.maxPrio, newPrio)
3290 : newPrio;
3291 rtInfo->rt_tqsecs = RT_NOCHANGE;
3292 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3293 if (ThreadPriorityVerbose) {
3294 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3295 }
3296 } else if (new_class == iaLimits.schedPolicy) {
3297 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3298 int maxClamped = MIN2(iaLimits.maxPrio,
3299 cur_class == new_class
3300 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3301 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3302 maxClamped, newPrio)
3303 : newPrio;
3304 iaInfo->ia_uprilim = cur_class == new_class
3305 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3306 iaInfo->ia_mode = IA_NOCHANGE;
3307 if (ThreadPriorityVerbose) {
3308 tty->print_cr("IA: [%d...%d] %d->%d\n",
3309 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3310 }
3311 } else if (new_class == tsLimits.schedPolicy) {
3312 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3313 int maxClamped = MIN2(tsLimits.maxPrio,
3314 cur_class == new_class
3315 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3316 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3317 maxClamped, newPrio)
3318 : newPrio;
3319 tsInfo->ts_uprilim = cur_class == new_class
3320 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3321 if (ThreadPriorityVerbose) {
3322 tty->print_cr("TS: [%d...%d] %d->%d\n",
3323 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3324 }
3325 } else if (new_class == fxLimits.schedPolicy) {
3326 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3327 int maxClamped = MIN2(fxLimits.maxPrio,
3328 cur_class == new_class
3329 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3330 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3331 maxClamped, newPrio)
3332 : newPrio;
3333 fxInfo->fx_uprilim = cur_class == new_class
3334 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3335 fxInfo->fx_tqsecs = FX_NOCHANGE;
3336 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3337 if (ThreadPriorityVerbose) {
3338 tty->print_cr("FX: [%d...%d] %d->%d\n",
3339 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3340 }
3341 } else {
3342 if (ThreadPriorityVerbose) {
3343 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3344 }
3345 return EINVAL; // no clue, punt
3346 }
3347
3348 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3349 if (ThreadPriorityVerbose && rslt) {
3350 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3351 }
3352 if (rslt < 0) return errno;
3353
3354 #ifdef ASSERT
3355 // Sanity check: read back what we just attempted to set.
3356 // In theory it could have changed in the interim ...
3357 //
3358 // The priocntl system call is tricky.
3359 // Sometimes it'll validate the priority value argument and
3360 // return EINVAL if unhappy. At other times it fails silently.
3361 // Readbacks are prudent.
3362
3363 if (!ReadBackValidate) return 0;
3364
3365 memset(&ReadBack, 0, sizeof(pcparms_t));
3366 ReadBack.pc_cid = PC_CLNULL;
3367 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3368 assert(rslt >= 0, "priocntl failed");
3369 Actual = Expected = 0xBAD;
3370 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3371 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3372 Actual = RTPRI(ReadBack)->rt_pri;
3373 Expected = RTPRI(ParmInfo)->rt_pri;
3374 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3375 Actual = IAPRI(ReadBack)->ia_upri;
3376 Expected = IAPRI(ParmInfo)->ia_upri;
3377 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3378 Actual = TSPRI(ReadBack)->ts_upri;
3379 Expected = TSPRI(ParmInfo)->ts_upri;
3380 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3381 Actual = FXPRI(ReadBack)->fx_upri;
3382 Expected = FXPRI(ParmInfo)->fx_upri;
3383 } else {
3384 if (ThreadPriorityVerbose) {
3385 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3386 ParmInfo.pc_cid);
3387 }
3388 }
3389
3390 if (Actual != Expected) {
3391 if (ThreadPriorityVerbose) {
3392 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3393 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3394 }
3395 }
3396 #endif
3397
3398 return 0;
3399 }
3400
3401 // Solaris only gives access to 128 real priorities at a time,
3402 // so we expand Java's ten to fill this range. This would be better
3403 // if we dynamically adjusted relative priorities.
3404 //
3405 // The ThreadPriorityPolicy option allows us to select 2 different
3406 // priority scales.
3407 //
3408 // ThreadPriorityPolicy=0
3409 // Since the Solaris' default priority is MaximumPriority, we do not
3410 // set a priority lower than Max unless a priority lower than
3411 // NormPriority is requested.
3412 //
3413 // ThreadPriorityPolicy=1
3414 // This mode causes the priority table to get filled with
3415 // linear values. NormPriority get's mapped to 50% of the
3416 // Maximum priority an so on. This will cause VM threads
3417 // to get unfair treatment against other Solaris processes
3418 // which do not explicitly alter their thread priorities.
3419
3420 int os::java_to_os_priority[CriticalPriority + 1] = {
3421 -99999, // 0 Entry should never be used
3422
3423 0, // 1 MinPriority
3424 32, // 2
3425 64, // 3
3426
3427 96, // 4
3428 127, // 5 NormPriority
3429 127, // 6
3430
3431 127, // 7
3432 127, // 8
3433 127, // 9 NearMaxPriority
3434
3435 127, // 10 MaxPriority
3436
3437 -criticalPrio // 11 CriticalPriority
3438 };
3439
3440 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3441 OSThread* osthread = thread->osthread();
3442
3443 // Save requested priority in case the thread hasn't been started
3444 osthread->set_native_priority(newpri);
3445
3446 // Check for critical priority request
3447 bool fxcritical = false;
3448 if (newpri == -criticalPrio) {
3449 fxcritical = true;
3450 newpri = criticalPrio;
3451 }
3452
3453 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3454 if (!UseThreadPriorities) return OS_OK;
3455
3456 int status = 0;
3457
3458 if (!fxcritical) {
3459 // Use thr_setprio only if we have a priority that thr_setprio understands
3460 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3461 }
3462
3463 int lwp_status =
3464 set_lwp_class_and_priority(osthread->thread_id(),
3465 osthread->lwp_id(),
3466 newpri,
3467 fxcritical ? fxLimits.schedPolicy : myClass,
3468 !fxcritical);
3469 if (lwp_status != 0 && fxcritical) {
3470 // Try again, this time without changing the scheduling class
3471 newpri = java_MaxPriority_to_os_priority;
3472 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3473 osthread->lwp_id(),
3474 newpri, myClass, false);
3475 }
3476 status |= lwp_status;
3477 return (status == 0) ? OS_OK : OS_ERR;
3478 }
3479
3480
3481 OSReturn os::get_native_priority(const Thread* const thread,
3482 int *priority_ptr) {
3483 int p;
3484 if (!UseThreadPriorities) {
3485 *priority_ptr = NormalPriority;
3486 return OS_OK;
3487 }
3488 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3489 if (status != 0) {
3490 return OS_ERR;
3491 }
3492 *priority_ptr = p;
3493 return OS_OK;
3494 }
3495
3496
3497 // Hint to the underlying OS that a task switch would not be good.
3498 // Void return because it's a hint and can fail.
3499 void os::hint_no_preempt() {
3500 schedctl_start(schedctl_init());
3501 }
3502
3503 static void resume_clear_context(OSThread *osthread) {
3504 osthread->set_ucontext(NULL);
3505 }
3506
3507 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3508 osthread->set_ucontext(context);
3509 }
3510
3511 static PosixSemaphore sr_semaphore;
3512
3513 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3514 // Save and restore errno to avoid confusing native code with EINTR
3515 // after sigsuspend.
3516 int old_errno = errno;
3517
3518 OSThread* osthread = thread->osthread();
3519 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3520
3521 os::SuspendResume::State current = osthread->sr.state();
3522 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3523 suspend_save_context(osthread, uc);
3524
3525 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3526 os::SuspendResume::State state = osthread->sr.suspended();
3527 if (state == os::SuspendResume::SR_SUSPENDED) {
3528 sigset_t suspend_set; // signals for sigsuspend()
3529
3530 // get current set of blocked signals and unblock resume signal
3531 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3532 sigdelset(&suspend_set, ASYNC_SIGNAL);
3533
3534 sr_semaphore.signal();
3535 // wait here until we are resumed
3536 while (1) {
3537 sigsuspend(&suspend_set);
3538
3539 os::SuspendResume::State result = osthread->sr.running();
3540 if (result == os::SuspendResume::SR_RUNNING) {
3541 sr_semaphore.signal();
3542 break;
3543 }
3544 }
3545
3546 } else if (state == os::SuspendResume::SR_RUNNING) {
3547 // request was cancelled, continue
3548 } else {
3549 ShouldNotReachHere();
3550 }
3551
3552 resume_clear_context(osthread);
3553 } else if (current == os::SuspendResume::SR_RUNNING) {
3554 // request was cancelled, continue
3555 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3556 // ignore
3557 } else {
3558 // ignore
3559 }
3560
3561 errno = old_errno;
3562 }
3563
3564 void os::print_statistics() {
3565 }
3566
3567 bool os::message_box(const char* title, const char* message) {
3568 int i;
3569 fdStream err(defaultStream::error_fd());
3570 for (i = 0; i < 78; i++) err.print_raw("=");
3571 err.cr();
3572 err.print_raw_cr(title);
3573 for (i = 0; i < 78; i++) err.print_raw("-");
3574 err.cr();
3575 err.print_raw_cr(message);
3576 for (i = 0; i < 78; i++) err.print_raw("=");
3577 err.cr();
3578
3579 char buf[16];
3580 // Prevent process from exiting upon "read error" without consuming all CPU
3581 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3582
3583 return buf[0] == 'y' || buf[0] == 'Y';
3584 }
3585
3586 static int sr_notify(OSThread* osthread) {
3587 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3588 assert_status(status == 0, status, "thr_kill");
3589 return status;
3590 }
3591
3592 // "Randomly" selected value for how long we want to spin
3593 // before bailing out on suspending a thread, also how often
3594 // we send a signal to a thread we want to resume
3595 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3596 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3597
3598 static bool do_suspend(OSThread* osthread) {
3599 assert(osthread->sr.is_running(), "thread should be running");
3600 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3601
3602 // mark as suspended and send signal
3603 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3604 // failed to switch, state wasn't running?
3605 ShouldNotReachHere();
3606 return false;
3607 }
3608
3609 if (sr_notify(osthread) != 0) {
3610 ShouldNotReachHere();
3611 }
3612
3613 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3614 while (true) {
3615 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3616 break;
3617 } else {
3618 // timeout
3619 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3620 if (cancelled == os::SuspendResume::SR_RUNNING) {
3621 return false;
3622 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3623 // make sure that we consume the signal on the semaphore as well
3624 sr_semaphore.wait();
3625 break;
3626 } else {
3627 ShouldNotReachHere();
3628 return false;
3629 }
3630 }
3631 }
3632
3633 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3634 return true;
3635 }
3636
3637 static void do_resume(OSThread* osthread) {
3638 assert(osthread->sr.is_suspended(), "thread should be suspended");
3639 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3640
3641 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3642 // failed to switch to WAKEUP_REQUEST
3643 ShouldNotReachHere();
3644 return;
3645 }
3646
3647 while (true) {
3648 if (sr_notify(osthread) == 0) {
3649 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3650 if (osthread->sr.is_running()) {
3651 return;
3652 }
3653 }
3654 } else {
3655 ShouldNotReachHere();
3656 }
3657 }
3658
3659 guarantee(osthread->sr.is_running(), "Must be running!");
3660 }
3661
3662 void os::SuspendedThreadTask::internal_do_task() {
3663 if (do_suspend(_thread->osthread())) {
3664 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3665 do_task(context);
3666 do_resume(_thread->osthread());
3667 }
3668 }
3669
3670 class PcFetcher : public os::SuspendedThreadTask {
3671 public:
3672 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3673 ExtendedPC result();
3674 protected:
3675 void do_task(const os::SuspendedThreadTaskContext& context);
3676 private:
3677 ExtendedPC _epc;
3678 };
3679
3680 ExtendedPC PcFetcher::result() {
3681 guarantee(is_done(), "task is not done yet.");
3682 return _epc;
3683 }
3684
3685 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3686 Thread* thread = context.thread();
3687 OSThread* osthread = thread->osthread();
3688 if (osthread->ucontext() != NULL) {
3689 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext());
3690 } else {
3691 // NULL context is unexpected, double-check this is the VMThread
3692 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3693 }
3694 }
3695
3696 // A lightweight implementation that does not suspend the target thread and
3697 // thus returns only a hint. Used for profiling only!
3698 ExtendedPC os::get_thread_pc(Thread* thread) {
3699 // Make sure that it is called by the watcher and the Threads lock is owned.
3700 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3701 // For now, is only used to profile the VM Thread
3702 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3703 PcFetcher fetcher(thread);
3704 fetcher.run();
3705 return fetcher.result();
3706 }
3707
3708
3709 // This does not do anything on Solaris. This is basically a hook for being
3710 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3711 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3712 const methodHandle& method, JavaCallArguments* args,
3713 Thread* thread) {
3714 f(value, method, args, thread);
3715 }
3716
3717 // This routine may be used by user applications as a "hook" to catch signals.
3718 // The user-defined signal handler must pass unrecognized signals to this
3719 // routine, and if it returns true (non-zero), then the signal handler must
3720 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3721 // routine will never retun false (zero), but instead will execute a VM panic
3722 // routine kill the process.
3723 //
3724 // If this routine returns false, it is OK to call it again. This allows
3725 // the user-defined signal handler to perform checks either before or after
3726 // the VM performs its own checks. Naturally, the user code would be making
3727 // a serious error if it tried to handle an exception (such as a null check
3728 // or breakpoint) that the VM was generating for its own correct operation.
3729 //
3730 // This routine may recognize any of the following kinds of signals:
3731 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3732 // ASYNC_SIGNAL.
3733 // It should be consulted by handlers for any of those signals.
3734 //
3735 // The caller of this routine must pass in the three arguments supplied
3736 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3737 // field of the structure passed to sigaction(). This routine assumes that
3738 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3739 //
3740 // Note that the VM will print warnings if it detects conflicting signal
3741 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3742 //
3743 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3744 siginfo_t* siginfo,
3745 void* ucontext,
3746 int abort_if_unrecognized);
3747
3748
3749 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3750 int orig_errno = errno; // Preserve errno value over signal handler.
3751 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3752 errno = orig_errno;
3753 }
3754
3755 // This boolean allows users to forward their own non-matching signals
3756 // to JVM_handle_solaris_signal, harmlessly.
3757 bool os::Solaris::signal_handlers_are_installed = false;
3758
3759 // For signal-chaining
3760 bool os::Solaris::libjsig_is_loaded = false;
3761 typedef struct sigaction *(*get_signal_t)(int);
3762 get_signal_t os::Solaris::get_signal_action = NULL;
3763
3764 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3765 struct sigaction *actp = NULL;
3766
3767 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3768 // Retrieve the old signal handler from libjsig
3769 actp = (*get_signal_action)(sig);
3770 }
3771 if (actp == NULL) {
3772 // Retrieve the preinstalled signal handler from jvm
3773 actp = get_preinstalled_handler(sig);
3774 }
3775
3776 return actp;
3777 }
3778
3779 static bool call_chained_handler(struct sigaction *actp, int sig,
3780 siginfo_t *siginfo, void *context) {
3781 // Call the old signal handler
3782 if (actp->sa_handler == SIG_DFL) {
3783 // It's more reasonable to let jvm treat it as an unexpected exception
3784 // instead of taking the default action.
3785 return false;
3786 } else if (actp->sa_handler != SIG_IGN) {
3787 if ((actp->sa_flags & SA_NODEFER) == 0) {
3788 // automaticlly block the signal
3789 sigaddset(&(actp->sa_mask), sig);
3790 }
3791
3792 sa_handler_t hand;
3793 sa_sigaction_t sa;
3794 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3795 // retrieve the chained handler
3796 if (siginfo_flag_set) {
3797 sa = actp->sa_sigaction;
3798 } else {
3799 hand = actp->sa_handler;
3800 }
3801
3802 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3803 actp->sa_handler = SIG_DFL;
3804 }
3805
3806 // try to honor the signal mask
3807 sigset_t oset;
3808 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3809
3810 // call into the chained handler
3811 if (siginfo_flag_set) {
3812 (*sa)(sig, siginfo, context);
3813 } else {
3814 (*hand)(sig);
3815 }
3816
3817 // restore the signal mask
3818 pthread_sigmask(SIG_SETMASK, &oset, 0);
3819 }
3820 // Tell jvm's signal handler the signal is taken care of.
3821 return true;
3822 }
3823
3824 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3825 bool chained = false;
3826 // signal-chaining
3827 if (UseSignalChaining) {
3828 struct sigaction *actp = get_chained_signal_action(sig);
3829 if (actp != NULL) {
3830 chained = call_chained_handler(actp, sig, siginfo, context);
3831 }
3832 }
3833 return chained;
3834 }
3835
3836 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3837 assert((chainedsigactions != (struct sigaction *)NULL) &&
3838 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3839 if (preinstalled_sigs[sig] != 0) {
3840 return &chainedsigactions[sig];
3841 }
3842 return NULL;
3843 }
3844
3845 void os::Solaris::save_preinstalled_handler(int sig,
3846 struct sigaction& oldAct) {
3847 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3848 assert((chainedsigactions != (struct sigaction *)NULL) &&
3849 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3850 chainedsigactions[sig] = oldAct;
3851 preinstalled_sigs[sig] = 1;
3852 }
3853
3854 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3855 bool oktochain) {
3856 // Check for overwrite.
3857 struct sigaction oldAct;
3858 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3859 void* oldhand =
3860 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3861 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3862 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3863 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3864 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3865 if (AllowUserSignalHandlers || !set_installed) {
3866 // Do not overwrite; user takes responsibility to forward to us.
3867 return;
3868 } else if (UseSignalChaining) {
3869 if (oktochain) {
3870 // save the old handler in jvm
3871 save_preinstalled_handler(sig, oldAct);
3872 } else {
3873 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3874 }
3875 // libjsig also interposes the sigaction() call below and saves the
3876 // old sigaction on it own.
3877 } else {
3878 fatal("Encountered unexpected pre-existing sigaction handler "
3879 "%#lx for signal %d.", (long)oldhand, sig);
3880 }
3881 }
3882
3883 struct sigaction sigAct;
3884 sigfillset(&(sigAct.sa_mask));
3885 sigAct.sa_handler = SIG_DFL;
3886
3887 sigAct.sa_sigaction = signalHandler;
3888 // Handle SIGSEGV on alternate signal stack if
3889 // not using stack banging
3890 if (!UseStackBanging && sig == SIGSEGV) {
3891 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3892 } else {
3893 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3894 }
3895 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3896
3897 sigaction(sig, &sigAct, &oldAct);
3898
3899 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3900 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3901 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3902 }
3903
3904
3905 #define DO_SIGNAL_CHECK(sig) \
3906 do { \
3907 if (!sigismember(&check_signal_done, sig)) { \
3908 os::Solaris::check_signal_handler(sig); \
3909 } \
3910 } while (0)
3911
3912 // This method is a periodic task to check for misbehaving JNI applications
3913 // under CheckJNI, we can add any periodic checks here
3914
3915 void os::run_periodic_checks() {
3916 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3917 // thereby preventing a NULL checks.
3918 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3919
3920 if (check_signals == false) return;
3921
3922 // SEGV and BUS if overridden could potentially prevent
3923 // generation of hs*.log in the event of a crash, debugging
3924 // such a case can be very challenging, so we absolutely
3925 // check for the following for a good measure:
3926 DO_SIGNAL_CHECK(SIGSEGV);
3927 DO_SIGNAL_CHECK(SIGILL);
3928 DO_SIGNAL_CHECK(SIGFPE);
3929 DO_SIGNAL_CHECK(SIGBUS);
3930 DO_SIGNAL_CHECK(SIGPIPE);
3931 DO_SIGNAL_CHECK(SIGXFSZ);
3932 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3933
3934 // ReduceSignalUsage allows the user to override these handlers
3935 // see comments at the very top and jvm_solaris.h
3936 if (!ReduceSignalUsage) {
3937 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3938 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3939 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3940 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3941 }
3942 }
3943
3944 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3945
3946 static os_sigaction_t os_sigaction = NULL;
3947
3948 void os::Solaris::check_signal_handler(int sig) {
3949 char buf[O_BUFLEN];
3950 address jvmHandler = NULL;
3951
3952 struct sigaction act;
3953 if (os_sigaction == NULL) {
3954 // only trust the default sigaction, in case it has been interposed
3955 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3956 if (os_sigaction == NULL) return;
3957 }
3958
3959 os_sigaction(sig, (struct sigaction*)NULL, &act);
3960
3961 address thisHandler = (act.sa_flags & SA_SIGINFO)
3962 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3963 : CAST_FROM_FN_PTR(address, act.sa_handler);
3964
3965
3966 switch (sig) {
3967 case SIGSEGV:
3968 case SIGBUS:
3969 case SIGFPE:
3970 case SIGPIPE:
3971 case SIGXFSZ:
3972 case SIGILL:
3973 case ASYNC_SIGNAL:
3974 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3975 break;
3976
3977 case SHUTDOWN1_SIGNAL:
3978 case SHUTDOWN2_SIGNAL:
3979 case SHUTDOWN3_SIGNAL:
3980 case BREAK_SIGNAL:
3981 jvmHandler = (address)user_handler();
3982 break;
3983
3984 default:
3985 return;
3986 }
3987
3988 if (thisHandler != jvmHandler) {
3989 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3990 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3991 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3992 // No need to check this sig any longer
3993 sigaddset(&check_signal_done, sig);
3994 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3995 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3996 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3997 exception_name(sig, buf, O_BUFLEN));
3998 }
3999 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4000 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4001 tty->print("expected:");
4002 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
4003 tty->cr();
4004 tty->print(" found:");
4005 os::Posix::print_sa_flags(tty, act.sa_flags);
4006 tty->cr();
4007 // No need to check this sig any longer
4008 sigaddset(&check_signal_done, sig);
4009 }
4010
4011 // Print all the signal handler state
4012 if (sigismember(&check_signal_done, sig)) {
4013 print_signal_handlers(tty, buf, O_BUFLEN);
4014 }
4015
4016 }
4017
4018 void os::Solaris::install_signal_handlers() {
4019 signal_handlers_are_installed = true;
4020
4021 // signal-chaining
4022 typedef void (*signal_setting_t)();
4023 signal_setting_t begin_signal_setting = NULL;
4024 signal_setting_t end_signal_setting = NULL;
4025 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4026 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4027 if (begin_signal_setting != NULL) {
4028 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4029 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4030 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4031 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4032 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4033 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4034 libjsig_is_loaded = true;
4035 if (os::Solaris::get_libjsig_version != NULL) {
4036 int libjsigversion = (*os::Solaris::get_libjsig_version)();
4037 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch");
4038 }
4039 assert(UseSignalChaining, "should enable signal-chaining");
4040 }
4041 if (libjsig_is_loaded) {
4042 // Tell libjsig jvm is setting signal handlers
4043 (*begin_signal_setting)();
4044 }
4045
4046 set_signal_handler(SIGSEGV, true, true);
4047 set_signal_handler(SIGPIPE, true, true);
4048 set_signal_handler(SIGXFSZ, true, true);
4049 set_signal_handler(SIGBUS, true, true);
4050 set_signal_handler(SIGILL, true, true);
4051 set_signal_handler(SIGFPE, true, true);
4052 set_signal_handler(ASYNC_SIGNAL, true, true);
4053
4054 if (libjsig_is_loaded) {
4055 // Tell libjsig jvm finishes setting signal handlers
4056 (*end_signal_setting)();
4057 }
4058
4059 // We don't activate signal checker if libjsig is in place, we trust ourselves
4060 // and if UserSignalHandler is installed all bets are off.
4061 // Log that signal checking is off only if -verbose:jni is specified.
4062 if (CheckJNICalls) {
4063 if (libjsig_is_loaded) {
4064 if (PrintJNIResolving) {
4065 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4066 }
4067 check_signals = false;
4068 }
4069 if (AllowUserSignalHandlers) {
4070 if (PrintJNIResolving) {
4071 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4072 }
4073 check_signals = false;
4074 }
4075 }
4076 }
4077
4078
4079 void report_error(const char* file_name, int line_no, const char* title,
4080 const char* format, ...);
4081
4082 // (Static) wrappers for the liblgrp API
4083 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4084 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4085 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4086 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4087 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4088 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4089 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4090 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4091 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4092
4093 static address resolve_symbol_lazy(const char* name) {
4094 address addr = (address) dlsym(RTLD_DEFAULT, name);
4095 if (addr == NULL) {
4096 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4097 addr = (address) dlsym(RTLD_NEXT, name);
4098 }
4099 return addr;
4100 }
4101
4102 static address resolve_symbol(const char* name) {
4103 address addr = resolve_symbol_lazy(name);
4104 if (addr == NULL) {
4105 fatal(dlerror());
4106 }
4107 return addr;
4108 }
4109
4110 void os::Solaris::libthread_init() {
4111 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4112
4113 lwp_priocntl_init();
4114
4115 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4116 if (func == NULL) {
4117 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4118 // Guarantee that this VM is running on an new enough OS (5.6 or
4119 // later) that it will have a new enough libthread.so.
4120 guarantee(func != NULL, "libthread.so is too old.");
4121 }
4122
4123 int size;
4124 void (*handler_info_func)(address *, int *);
4125 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4126 handler_info_func(&handler_start, &size);
4127 handler_end = handler_start + size;
4128 }
4129
4130
4131 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4132 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4133 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4134 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4135 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4136 int os::Solaris::_mutex_scope = USYNC_THREAD;
4137
4138 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4139 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4140 int_fnP_cond_tP os::Solaris::_cond_signal;
4141 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4142 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4143 int_fnP_cond_tP os::Solaris::_cond_destroy;
4144 int os::Solaris::_cond_scope = USYNC_THREAD;
4145
4146 void os::Solaris::synchronization_init() {
4147 if (UseLWPSynchronization) {
4148 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4149 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4150 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4151 os::Solaris::set_mutex_init(lwp_mutex_init);
4152 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4153 os::Solaris::set_mutex_scope(USYNC_THREAD);
4154
4155 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4156 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4157 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4158 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4159 os::Solaris::set_cond_init(lwp_cond_init);
4160 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4161 os::Solaris::set_cond_scope(USYNC_THREAD);
4162 } else {
4163 os::Solaris::set_mutex_scope(USYNC_THREAD);
4164 os::Solaris::set_cond_scope(USYNC_THREAD);
4165
4166 if (UsePthreads) {
4167 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4168 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4169 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4170 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4171 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4172
4173 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4174 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4175 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4176 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4177 os::Solaris::set_cond_init(pthread_cond_default_init);
4178 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4179 } else {
4180 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4181 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4182 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4183 os::Solaris::set_mutex_init(::mutex_init);
4184 os::Solaris::set_mutex_destroy(::mutex_destroy);
4185
4186 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4187 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4188 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4189 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4190 os::Solaris::set_cond_init(::cond_init);
4191 os::Solaris::set_cond_destroy(::cond_destroy);
4192 }
4193 }
4194 }
4195
4196 bool os::Solaris::liblgrp_init() {
4197 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4198 if (handle != NULL) {
4199 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4200 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4201 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4202 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4203 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4204 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4205 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4206 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4207 dlsym(handle, "lgrp_cookie_stale")));
4208
4209 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4210 set_lgrp_cookie(c);
4211 return true;
4212 }
4213 return false;
4214 }
4215
4216 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4217 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4218 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4219
4220 void init_pset_getloadavg_ptr(void) {
4221 pset_getloadavg_ptr =
4222 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4223 if (pset_getloadavg_ptr == NULL) {
4224 log_warning(os)("pset_getloadavg function not found");
4225 }
4226 }
4227
4228 int os::Solaris::_dev_zero_fd = -1;
4229
4230 // this is called _before_ the global arguments have been parsed
4231 void os::init(void) {
4232 _initial_pid = getpid();
4233
4234 max_hrtime = first_hrtime = gethrtime();
4235
4236 init_random(1234567);
4237
4238 page_size = sysconf(_SC_PAGESIZE);
4239 if (page_size == -1) {
4240 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4241 }
4242 init_page_sizes((size_t) page_size);
4243
4244 Solaris::initialize_system_info();
4245
4246 int fd = ::open("/dev/zero", O_RDWR);
4247 if (fd < 0) {
4248 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4249 } else {
4250 Solaris::set_dev_zero_fd(fd);
4251
4252 // Close on exec, child won't inherit.
4253 fcntl(fd, F_SETFD, FD_CLOEXEC);
4254 }
4255
4256 clock_tics_per_sec = CLK_TCK;
4257
4258 // check if dladdr1() exists; dladdr1 can provide more information than
4259 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4260 // and is available on linker patches for 5.7 and 5.8.
4261 // libdl.so must have been loaded, this call is just an entry lookup
4262 void * hdl = dlopen("libdl.so", RTLD_NOW);
4263 if (hdl) {
4264 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4265 }
4266
4267 // (Solaris only) this switches to calls that actually do locking.
4268 ThreadCritical::initialize();
4269
4270 main_thread = thr_self();
4271
4272 // dynamic lookup of functions that may not be available in our lowest
4273 // supported Solaris release
4274 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4275 if (handle != NULL) {
4276 Solaris::_pthread_setname_np = // from 11.3
4277 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4278 }
4279 }
4280
4281 // To install functions for atexit system call
4282 extern "C" {
4283 static void perfMemory_exit_helper() {
4284 perfMemory_exit();
4285 }
4286 }
4287
4288 // this is called _after_ the global arguments have been parsed
4289 jint os::init_2(void) {
4290 // try to enable extended file IO ASAP, see 6431278
4291 os::Solaris::try_enable_extended_io();
4292
4293 // Allocate a single page and mark it as readable for safepoint polling. Also
4294 // use this first mmap call to check support for MAP_ALIGN.
4295 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4296 page_size,
4297 MAP_PRIVATE | MAP_ALIGN,
4298 PROT_READ);
4299 if (polling_page == NULL) {
4300 has_map_align = false;
4301 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4302 PROT_READ);
4303 }
4304
4305 os::set_polling_page(polling_page);
4306 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4307
4308 if (!UseMembar) {
4309 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4310 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4311 os::set_memory_serialize_page(mem_serialize_page);
4312 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4313 }
4314
4315 // Check and sets minimum stack sizes against command line options
4316 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4317 return JNI_ERR;
4318 }
4319
4320 Solaris::libthread_init();
4321
4322 if (UseNUMA) {
4323 if (!Solaris::liblgrp_init()) {
4324 UseNUMA = false;
4325 } else {
4326 size_t lgrp_limit = os::numa_get_groups_num();
4327 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4328 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4329 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4330 if (lgrp_num < 2) {
4331 // There's only one locality group, disable NUMA.
4332 UseNUMA = false;
4333 }
4334 }
4335 if (!UseNUMA && ForceNUMA) {
4336 UseNUMA = true;
4337 }
4338 }
4339
4340 Solaris::signal_sets_init();
4341 Solaris::init_signal_mem();
4342 Solaris::install_signal_handlers();
4343
4344 // initialize synchronization primitives to use either thread or
4345 // lwp synchronization (controlled by UseLWPSynchronization)
4346 Solaris::synchronization_init();
4347
4348 if (MaxFDLimit) {
4349 // set the number of file descriptors to max. print out error
4350 // if getrlimit/setrlimit fails but continue regardless.
4351 struct rlimit nbr_files;
4352 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4353 if (status != 0) {
4354 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4355 } else {
4356 nbr_files.rlim_cur = nbr_files.rlim_max;
4357 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4358 if (status != 0) {
4359 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4360 }
4361 }
4362 }
4363
4364 // Calculate theoretical max. size of Threads to guard gainst
4365 // artifical out-of-memory situations, where all available address-
4366 // space has been reserved by thread stacks. Default stack size is 1Mb.
4367 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4368 JavaThread::stack_size_at_create() : (1*K*K);
4369 assert(pre_thread_stack_size != 0, "Must have a stack");
4370 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4371 // we should start doing Virtual Memory banging. Currently when the threads will
4372 // have used all but 200Mb of space.
4373 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4374 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4375
4376 // at-exit methods are called in the reverse order of their registration.
4377 // In Solaris 7 and earlier, atexit functions are called on return from
4378 // main or as a result of a call to exit(3C). There can be only 32 of
4379 // these functions registered and atexit() does not set errno. In Solaris
4380 // 8 and later, there is no limit to the number of functions registered
4381 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4382 // functions are called upon dlclose(3DL) in addition to return from main
4383 // and exit(3C).
4384
4385 if (PerfAllowAtExitRegistration) {
4386 // only register atexit functions if PerfAllowAtExitRegistration is set.
4387 // atexit functions can be delayed until process exit time, which
4388 // can be problematic for embedded VM situations. Embedded VMs should
4389 // call DestroyJavaVM() to assure that VM resources are released.
4390
4391 // note: perfMemory_exit_helper atexit function may be removed in
4392 // the future if the appropriate cleanup code can be added to the
4393 // VM_Exit VMOperation's doit method.
4394 if (atexit(perfMemory_exit_helper) != 0) {
4395 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4396 }
4397 }
4398
4399 // Init pset_loadavg function pointer
4400 init_pset_getloadavg_ptr();
4401
4402 return JNI_OK;
4403 }
4404
4405 // Mark the polling page as unreadable
4406 void os::make_polling_page_unreadable(void) {
4407 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4408 fatal("Could not disable polling page");
4409 }
4410 }
4411
4412 // Mark the polling page as readable
4413 void os::make_polling_page_readable(void) {
4414 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4415 fatal("Could not enable polling page");
4416 }
4417 }
4418
4419 // Is a (classpath) directory empty?
4420 bool os::dir_is_empty(const char* path) {
4421 DIR *dir = NULL;
4422 struct dirent *ptr;
4423
4424 dir = opendir(path);
4425 if (dir == NULL) return true;
4426
4427 // Scan the directory
4428 bool result = true;
4429 char buf[sizeof(struct dirent) + MAX_PATH];
4430 struct dirent *dbuf = (struct dirent *) buf;
4431 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4432 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4433 result = false;
4434 }
4435 }
4436 closedir(dir);
4437 return result;
4438 }
4439
4440 // This code originates from JDK's sysOpen and open64_w
4441 // from src/solaris/hpi/src/system_md.c
4442
4443 int os::open(const char *path, int oflag, int mode) {
4444 if (strlen(path) > MAX_PATH - 1) {
4445 errno = ENAMETOOLONG;
4446 return -1;
4447 }
4448 int fd;
4449
4450 fd = ::open64(path, oflag, mode);
4451 if (fd == -1) return -1;
4452
4453 // If the open succeeded, the file might still be a directory
4454 {
4455 struct stat64 buf64;
4456 int ret = ::fstat64(fd, &buf64);
4457 int st_mode = buf64.st_mode;
4458
4459 if (ret != -1) {
4460 if ((st_mode & S_IFMT) == S_IFDIR) {
4461 errno = EISDIR;
4462 ::close(fd);
4463 return -1;
4464 }
4465 } else {
4466 ::close(fd);
4467 return -1;
4468 }
4469 }
4470
4471 // 32-bit Solaris systems suffer from:
4472 //
4473 // - an historical default soft limit of 256 per-process file
4474 // descriptors that is too low for many Java programs.
4475 //
4476 // - a design flaw where file descriptors created using stdio
4477 // fopen must be less than 256, _even_ when the first limit above
4478 // has been raised. This can cause calls to fopen (but not calls to
4479 // open, for example) to fail mysteriously, perhaps in 3rd party
4480 // native code (although the JDK itself uses fopen). One can hardly
4481 // criticize them for using this most standard of all functions.
4482 //
4483 // We attempt to make everything work anyways by:
4484 //
4485 // - raising the soft limit on per-process file descriptors beyond
4486 // 256
4487 //
4488 // - As of Solaris 10u4, we can request that Solaris raise the 256
4489 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4490 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4491 //
4492 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4493 // workaround the bug by remapping non-stdio file descriptors below
4494 // 256 to ones beyond 256, which is done below.
4495 //
4496 // See:
4497 // 1085341: 32-bit stdio routines should support file descriptors >255
4498 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4499 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4500 // enable_extended_FILE_stdio() in VM initialisation
4501 // Giri Mandalika's blog
4502 // http://technopark02.blogspot.com/2005_05_01_archive.html
4503 //
4504 #ifndef _LP64
4505 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4506 int newfd = ::fcntl(fd, F_DUPFD, 256);
4507 if (newfd != -1) {
4508 ::close(fd);
4509 fd = newfd;
4510 }
4511 }
4512 #endif // 32-bit Solaris
4513
4514 // All file descriptors that are opened in the JVM and not
4515 // specifically destined for a subprocess should have the
4516 // close-on-exec flag set. If we don't set it, then careless 3rd
4517 // party native code might fork and exec without closing all
4518 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4519 // UNIXProcess.c), and this in turn might:
4520 //
4521 // - cause end-of-file to fail to be detected on some file
4522 // descriptors, resulting in mysterious hangs, or
4523 //
4524 // - might cause an fopen in the subprocess to fail on a system
4525 // suffering from bug 1085341.
4526 //
4527 // (Yes, the default setting of the close-on-exec flag is a Unix
4528 // design flaw)
4529 //
4530 // See:
4531 // 1085341: 32-bit stdio routines should support file descriptors >255
4532 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4533 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4534 //
4535 #ifdef FD_CLOEXEC
4536 {
4537 int flags = ::fcntl(fd, F_GETFD);
4538 if (flags != -1) {
4539 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4540 }
4541 }
4542 #endif
4543
4544 return fd;
4545 }
4546
4547 // create binary file, rewriting existing file if required
4548 int os::create_binary_file(const char* path, bool rewrite_existing) {
4549 int oflags = O_WRONLY | O_CREAT;
4550 if (!rewrite_existing) {
4551 oflags |= O_EXCL;
4552 }
4553 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4554 }
4555
4556 // return current position of file pointer
4557 jlong os::current_file_offset(int fd) {
4558 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4559 }
4560
4561 // move file pointer to the specified offset
4562 jlong os::seek_to_file_offset(int fd, jlong offset) {
4563 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4564 }
4565
4566 jlong os::lseek(int fd, jlong offset, int whence) {
4567 return (jlong) ::lseek64(fd, offset, whence);
4568 }
4569
4570 char * os::native_path(char *path) {
4571 return path;
4572 }
4573
4574 int os::ftruncate(int fd, jlong length) {
4575 return ::ftruncate64(fd, length);
4576 }
4577
4578 int os::fsync(int fd) {
4579 RESTARTABLE_RETURN_INT(::fsync(fd));
4580 }
4581
4582 int os::available(int fd, jlong *bytes) {
4583 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4584 "Assumed _thread_in_native");
4585 jlong cur, end;
4586 int mode;
4587 struct stat64 buf64;
4588
4589 if (::fstat64(fd, &buf64) >= 0) {
4590 mode = buf64.st_mode;
4591 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4592 int n,ioctl_return;
4593
4594 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4595 if (ioctl_return>= 0) {
4596 *bytes = n;
4597 return 1;
4598 }
4599 }
4600 }
4601 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4602 return 0;
4603 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4604 return 0;
4605 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4606 return 0;
4607 }
4608 *bytes = end - cur;
4609 return 1;
4610 }
4611
4612 // Map a block of memory.
4613 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4614 char *addr, size_t bytes, bool read_only,
4615 bool allow_exec) {
4616 int prot;
4617 int flags;
4618
4619 if (read_only) {
4620 prot = PROT_READ;
4621 flags = MAP_SHARED;
4622 } else {
4623 prot = PROT_READ | PROT_WRITE;
4624 flags = MAP_PRIVATE;
4625 }
4626
4627 if (allow_exec) {
4628 prot |= PROT_EXEC;
4629 }
4630
4631 if (addr != NULL) {
4632 flags |= MAP_FIXED;
4633 }
4634
4635 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4636 fd, file_offset);
4637 if (mapped_address == MAP_FAILED) {
4638 return NULL;
4639 }
4640 return mapped_address;
4641 }
4642
4643
4644 // Remap a block of memory.
4645 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4646 char *addr, size_t bytes, bool read_only,
4647 bool allow_exec) {
4648 // same as map_memory() on this OS
4649 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4650 allow_exec);
4651 }
4652
4653
4654 // Unmap a block of memory.
4655 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4656 return munmap(addr, bytes) == 0;
4657 }
4658
4659 void os::pause() {
4660 char filename[MAX_PATH];
4661 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4662 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4663 } else {
4664 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4665 }
4666
4667 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4668 if (fd != -1) {
4669 struct stat buf;
4670 ::close(fd);
4671 while (::stat(filename, &buf) == 0) {
4672 (void)::poll(NULL, 0, 100);
4673 }
4674 } else {
4675 jio_fprintf(stderr,
4676 "Could not open pause file '%s', continuing immediately.\n", filename);
4677 }
4678 }
4679
4680 #ifndef PRODUCT
4681 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4682 // Turn this on if you need to trace synch operations.
4683 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4684 // and call record_synch_enable and record_synch_disable
4685 // around the computation of interest.
4686
4687 void record_synch(char* name, bool returning); // defined below
4688
4689 class RecordSynch {
4690 char* _name;
4691 public:
4692 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4693 ~RecordSynch() { record_synch(_name, true); }
4694 };
4695
4696 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4697 extern "C" ret name params { \
4698 typedef ret name##_t params; \
4699 static name##_t* implem = NULL; \
4700 static int callcount = 0; \
4701 if (implem == NULL) { \
4702 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4703 if (implem == NULL) fatal(dlerror()); \
4704 } \
4705 ++callcount; \
4706 RecordSynch _rs(#name); \
4707 inner; \
4708 return implem args; \
4709 }
4710 // in dbx, examine callcounts this way:
4711 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4712
4713 #define CHECK_POINTER_OK(p) \
4714 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4715 #define CHECK_MU \
4716 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4717 #define CHECK_CV \
4718 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4719 #define CHECK_P(p) \
4720 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4721
4722 #define CHECK_MUTEX(mutex_op) \
4723 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4724
4725 CHECK_MUTEX( mutex_lock)
4726 CHECK_MUTEX( _mutex_lock)
4727 CHECK_MUTEX( mutex_unlock)
4728 CHECK_MUTEX(_mutex_unlock)
4729 CHECK_MUTEX( mutex_trylock)
4730 CHECK_MUTEX(_mutex_trylock)
4731
4732 #define CHECK_COND(cond_op) \
4733 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4734
4735 CHECK_COND( cond_wait);
4736 CHECK_COND(_cond_wait);
4737 CHECK_COND(_cond_wait_cancel);
4738
4739 #define CHECK_COND2(cond_op) \
4740 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4741
4742 CHECK_COND2( cond_timedwait);
4743 CHECK_COND2(_cond_timedwait);
4744 CHECK_COND2(_cond_timedwait_cancel);
4745
4746 // do the _lwp_* versions too
4747 #define mutex_t lwp_mutex_t
4748 #define cond_t lwp_cond_t
4749 CHECK_MUTEX( _lwp_mutex_lock)
4750 CHECK_MUTEX( _lwp_mutex_unlock)
4751 CHECK_MUTEX( _lwp_mutex_trylock)
4752 CHECK_MUTEX( __lwp_mutex_lock)
4753 CHECK_MUTEX( __lwp_mutex_unlock)
4754 CHECK_MUTEX( __lwp_mutex_trylock)
4755 CHECK_MUTEX(___lwp_mutex_lock)
4756 CHECK_MUTEX(___lwp_mutex_unlock)
4757
4758 CHECK_COND( _lwp_cond_wait);
4759 CHECK_COND( __lwp_cond_wait);
4760 CHECK_COND(___lwp_cond_wait);
4761
4762 CHECK_COND2( _lwp_cond_timedwait);
4763 CHECK_COND2( __lwp_cond_timedwait);
4764 #undef mutex_t
4765 #undef cond_t
4766
4767 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4768 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4769 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4770 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4771 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4772 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4773 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4774 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4775
4776
4777 // recording machinery:
4778
4779 enum { RECORD_SYNCH_LIMIT = 200 };
4780 char* record_synch_name[RECORD_SYNCH_LIMIT];
4781 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4782 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4783 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4784 int record_synch_count = 0;
4785 bool record_synch_enabled = false;
4786
4787 // in dbx, examine recorded data this way:
4788 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4789
4790 void record_synch(char* name, bool returning) {
4791 if (record_synch_enabled) {
4792 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4793 record_synch_name[record_synch_count] = name;
4794 record_synch_returning[record_synch_count] = returning;
4795 record_synch_thread[record_synch_count] = thr_self();
4796 record_synch_arg0ptr[record_synch_count] = &name;
4797 record_synch_count++;
4798 }
4799 // put more checking code here:
4800 // ...
4801 }
4802 }
4803
4804 void record_synch_enable() {
4805 // start collecting trace data, if not already doing so
4806 if (!record_synch_enabled) record_synch_count = 0;
4807 record_synch_enabled = true;
4808 }
4809
4810 void record_synch_disable() {
4811 // stop collecting trace data
4812 record_synch_enabled = false;
4813 }
4814
4815 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4816 #endif // PRODUCT
4817
4818 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4819 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4820 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4821
4822
4823 // JVMTI & JVM monitoring and management support
4824 // The thread_cpu_time() and current_thread_cpu_time() are only
4825 // supported if is_thread_cpu_time_supported() returns true.
4826 // They are not supported on Solaris T1.
4827
4828 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4829 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4830 // of a thread.
4831 //
4832 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4833 // returns the fast estimate available on the platform.
4834
4835 // hrtime_t gethrvtime() return value includes
4836 // user time but does not include system time
4837 jlong os::current_thread_cpu_time() {
4838 return (jlong) gethrvtime();
4839 }
4840
4841 jlong os::thread_cpu_time(Thread *thread) {
4842 // return user level CPU time only to be consistent with
4843 // what current_thread_cpu_time returns.
4844 // thread_cpu_time_info() must be changed if this changes
4845 return os::thread_cpu_time(thread, false /* user time only */);
4846 }
4847
4848 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4849 if (user_sys_cpu_time) {
4850 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4851 } else {
4852 return os::current_thread_cpu_time();
4853 }
4854 }
4855
4856 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4857 char proc_name[64];
4858 int count;
4859 prusage_t prusage;
4860 jlong lwp_time;
4861 int fd;
4862
4863 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4864 getpid(),
4865 thread->osthread()->lwp_id());
4866 fd = ::open(proc_name, O_RDONLY);
4867 if (fd == -1) return -1;
4868
4869 do {
4870 count = ::pread(fd,
4871 (void *)&prusage.pr_utime,
4872 thr_time_size,
4873 thr_time_off);
4874 } while (count < 0 && errno == EINTR);
4875 ::close(fd);
4876 if (count < 0) return -1;
4877
4878 if (user_sys_cpu_time) {
4879 // user + system CPU time
4880 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4881 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4882 (jlong)prusage.pr_stime.tv_nsec +
4883 (jlong)prusage.pr_utime.tv_nsec;
4884 } else {
4885 // user level CPU time only
4886 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4887 (jlong)prusage.pr_utime.tv_nsec;
4888 }
4889
4890 return (lwp_time);
4891 }
4892
4893 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4894 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4895 info_ptr->may_skip_backward = false; // elapsed time not wall time
4896 info_ptr->may_skip_forward = false; // elapsed time not wall time
4897 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4898 }
4899
4900 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4901 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4902 info_ptr->may_skip_backward = false; // elapsed time not wall time
4903 info_ptr->may_skip_forward = false; // elapsed time not wall time
4904 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4905 }
4906
4907 bool os::is_thread_cpu_time_supported() {
4908 return true;
4909 }
4910
4911 // System loadavg support. Returns -1 if load average cannot be obtained.
4912 // Return the load average for our processor set if the primitive exists
4913 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4914 int os::loadavg(double loadavg[], int nelem) {
4915 if (pset_getloadavg_ptr != NULL) {
4916 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4917 } else {
4918 return ::getloadavg(loadavg, nelem);
4919 }
4920 }
4921
4922 //---------------------------------------------------------------------------------
4923
4924 bool os::find(address addr, outputStream* st) {
4925 Dl_info dlinfo;
4926 memset(&dlinfo, 0, sizeof(dlinfo));
4927 if (dladdr(addr, &dlinfo) != 0) {
4928 st->print(PTR_FORMAT ": ", addr);
4929 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4930 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4931 } else if (dlinfo.dli_fbase != NULL) {
4932 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4933 } else {
4934 st->print("<absolute address>");
4935 }
4936 if (dlinfo.dli_fname != NULL) {
4937 st->print(" in %s", dlinfo.dli_fname);
4938 }
4939 if (dlinfo.dli_fbase != NULL) {
4940 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4941 }
4942 st->cr();
4943
4944 if (Verbose) {
4945 // decode some bytes around the PC
4946 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4947 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4948 address lowest = (address) dlinfo.dli_sname;
4949 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4950 if (begin < lowest) begin = lowest;
4951 Dl_info dlinfo2;
4952 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4953 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4954 end = (address) dlinfo2.dli_saddr;
4955 }
4956 Disassembler::decode(begin, end, st);
4957 }
4958 return true;
4959 }
4960 return false;
4961 }
4962
4963 // Following function has been added to support HotSparc's libjvm.so running
4964 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4965 // src/solaris/hpi/native_threads in the EVM codebase.
4966 //
4967 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4968 // libraries and should thus be removed. We will leave it behind for a while
4969 // until we no longer want to able to run on top of 1.3.0 Solaris production
4970 // JDK. See 4341971.
4971
4972 #define STACK_SLACK 0x800
4973
4974 extern "C" {
4975 intptr_t sysThreadAvailableStackWithSlack() {
4976 stack_t st;
4977 intptr_t retval, stack_top;
4978 retval = thr_stksegment(&st);
4979 assert(retval == 0, "incorrect return value from thr_stksegment");
4980 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4981 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4982 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4983 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4984 }
4985 }
4986
4987 // ObjectMonitor park-unpark infrastructure ...
4988 //
4989 // We implement Solaris and Linux PlatformEvents with the
4990 // obvious condvar-mutex-flag triple.
4991 // Another alternative that works quite well is pipes:
4992 // Each PlatformEvent consists of a pipe-pair.
4993 // The thread associated with the PlatformEvent
4994 // calls park(), which reads from the input end of the pipe.
4995 // Unpark() writes into the other end of the pipe.
4996 // The write-side of the pipe must be set NDELAY.
4997 // Unfortunately pipes consume a large # of handles.
4998 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
4999 // Using pipes for the 1st few threads might be workable, however.
5000 //
5001 // park() is permitted to return spuriously.
5002 // Callers of park() should wrap the call to park() in
5003 // an appropriate loop. A litmus test for the correct
5004 // usage of park is the following: if park() were modified
5005 // to immediately return 0 your code should still work,
5006 // albeit degenerating to a spin loop.
5007 //
5008 // In a sense, park()-unpark() just provides more polite spinning
5009 // and polling with the key difference over naive spinning being
5010 // that a parked thread needs to be explicitly unparked() in order
5011 // to wake up and to poll the underlying condition.
5012 //
5013 // Assumption:
5014 // Only one parker can exist on an event, which is why we allocate
5015 // them per-thread. Multiple unparkers can coexist.
5016 //
5017 // _Event transitions in park()
5018 // -1 => -1 : illegal
5019 // 1 => 0 : pass - return immediately
5020 // 0 => -1 : block; then set _Event to 0 before returning
5021 //
5022 // _Event transitions in unpark()
5023 // 0 => 1 : just return
5024 // 1 => 1 : just return
5025 // -1 => either 0 or 1; must signal target thread
5026 // That is, we can safely transition _Event from -1 to either
5027 // 0 or 1.
5028 //
5029 // _Event serves as a restricted-range semaphore.
5030 // -1 : thread is blocked, i.e. there is a waiter
5031 // 0 : neutral: thread is running or ready,
5032 // could have been signaled after a wait started
5033 // 1 : signaled - thread is running or ready
5034 //
5035 // Another possible encoding of _Event would be with
5036 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5037 //
5038 // TODO-FIXME: add DTRACE probes for:
5039 // 1. Tx parks
5040 // 2. Ty unparks Tx
5041 // 3. Tx resumes from park
5042
5043
5044 // value determined through experimentation
5045 #define ROUNDINGFIX 11
5046
5047 // utility to compute the abstime argument to timedwait.
5048 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5049
5050 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5051 // millis is the relative timeout time
5052 // abstime will be the absolute timeout time
5053 if (millis < 0) millis = 0;
5054 struct timeval now;
5055 int status = gettimeofday(&now, NULL);
5056 assert(status == 0, "gettimeofday");
5057 jlong seconds = millis / 1000;
5058 jlong max_wait_period;
5059
5060 if (UseLWPSynchronization) {
5061 // forward port of fix for 4275818 (not sleeping long enough)
5062 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5063 // _lwp_cond_timedwait() used a round_down algorithm rather
5064 // than a round_up. For millis less than our roundfactor
5065 // it rounded down to 0 which doesn't meet the spec.
5066 // For millis > roundfactor we may return a bit sooner, but
5067 // since we can not accurately identify the patch level and
5068 // this has already been fixed in Solaris 9 and 8 we will
5069 // leave it alone rather than always rounding down.
5070
5071 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5072 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5073 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5074 max_wait_period = 21000000;
5075 } else {
5076 max_wait_period = 50000000;
5077 }
5078 millis %= 1000;
5079 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5080 seconds = max_wait_period;
5081 }
5082 abstime->tv_sec = now.tv_sec + seconds;
5083 long usec = now.tv_usec + millis * 1000;
5084 if (usec >= 1000000) {
5085 abstime->tv_sec += 1;
5086 usec -= 1000000;
5087 }
5088 abstime->tv_nsec = usec * 1000;
5089 return abstime;
5090 }
5091
5092 void os::PlatformEvent::park() { // AKA: down()
5093 // Transitions for _Event:
5094 // -1 => -1 : illegal
5095 // 1 => 0 : pass - return immediately
5096 // 0 => -1 : block; then set _Event to 0 before returning
5097
5098 // Invariant: Only the thread associated with the Event/PlatformEvent
5099 // may call park().
5100 assert(_nParked == 0, "invariant");
5101
5102 int v;
5103 for (;;) {
5104 v = _Event;
5105 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5106 }
5107 guarantee(v >= 0, "invariant");
5108 if (v == 0) {
5109 // Do this the hard way by blocking ...
5110 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5111 int status = os::Solaris::mutex_lock(_mutex);
5112 assert_status(status == 0, status, "mutex_lock");
5113 guarantee(_nParked == 0, "invariant");
5114 ++_nParked;
5115 while (_Event < 0) {
5116 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5117 // Treat this the same as if the wait was interrupted
5118 // With usr/lib/lwp going to kernel, always handle ETIME
5119 status = os::Solaris::cond_wait(_cond, _mutex);
5120 if (status == ETIME) status = EINTR;
5121 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5122 }
5123 --_nParked;
5124 _Event = 0;
5125 status = os::Solaris::mutex_unlock(_mutex);
5126 assert_status(status == 0, status, "mutex_unlock");
5127 // Paranoia to ensure our locked and lock-free paths interact
5128 // correctly with each other.
5129 OrderAccess::fence();
5130 }
5131 }
5132
5133 int os::PlatformEvent::park(jlong millis) {
5134 // Transitions for _Event:
5135 // -1 => -1 : illegal
5136 // 1 => 0 : pass - return immediately
5137 // 0 => -1 : block; then set _Event to 0 before returning
5138
5139 guarantee(_nParked == 0, "invariant");
5140 int v;
5141 for (;;) {
5142 v = _Event;
5143 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5144 }
5145 guarantee(v >= 0, "invariant");
5146 if (v != 0) return OS_OK;
5147
5148 int ret = OS_TIMEOUT;
5149 timestruc_t abst;
5150 compute_abstime(&abst, millis);
5151
5152 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5153 int status = os::Solaris::mutex_lock(_mutex);
5154 assert_status(status == 0, status, "mutex_lock");
5155 guarantee(_nParked == 0, "invariant");
5156 ++_nParked;
5157 while (_Event < 0) {
5158 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5159 assert_status(status == 0 || status == EINTR ||
5160 status == ETIME || status == ETIMEDOUT,
5161 status, "cond_timedwait");
5162 if (!FilterSpuriousWakeups) break; // previous semantics
5163 if (status == ETIME || status == ETIMEDOUT) break;
5164 // We consume and ignore EINTR and spurious wakeups.
5165 }
5166 --_nParked;
5167 if (_Event >= 0) ret = OS_OK;
5168 _Event = 0;
5169 status = os::Solaris::mutex_unlock(_mutex);
5170 assert_status(status == 0, status, "mutex_unlock");
5171 // Paranoia to ensure our locked and lock-free paths interact
5172 // correctly with each other.
5173 OrderAccess::fence();
5174 return ret;
5175 }
5176
5177 void os::PlatformEvent::unpark() {
5178 // Transitions for _Event:
5179 // 0 => 1 : just return
5180 // 1 => 1 : just return
5181 // -1 => either 0 or 1; must signal target thread
5182 // That is, we can safely transition _Event from -1 to either
5183 // 0 or 1.
5184 // See also: "Semaphores in Plan 9" by Mullender & Cox
5185 //
5186 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5187 // that it will take two back-to-back park() calls for the owning
5188 // thread to block. This has the benefit of forcing a spurious return
5189 // from the first park() call after an unpark() call which will help
5190 // shake out uses of park() and unpark() without condition variables.
5191
5192 if (Atomic::xchg(1, &_Event) >= 0) return;
5193
5194 // If the thread associated with the event was parked, wake it.
5195 // Wait for the thread assoc with the PlatformEvent to vacate.
5196 int status = os::Solaris::mutex_lock(_mutex);
5197 assert_status(status == 0, status, "mutex_lock");
5198 int AnyWaiters = _nParked;
5199 status = os::Solaris::mutex_unlock(_mutex);
5200 assert_status(status == 0, status, "mutex_unlock");
5201 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5202 if (AnyWaiters != 0) {
5203 // Note that we signal() *after* dropping the lock for "immortal" Events.
5204 // This is safe and avoids a common class of futile wakeups. In rare
5205 // circumstances this can cause a thread to return prematurely from
5206 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5207 // will simply re-test the condition and re-park itself.
5208 // This provides particular benefit if the underlying platform does not
5209 // provide wait morphing.
5210 status = os::Solaris::cond_signal(_cond);
5211 assert_status(status == 0, status, "cond_signal");
5212 }
5213 }
5214
5215 // JSR166
5216 // -------------------------------------------------------
5217
5218 // The solaris and linux implementations of park/unpark are fairly
5219 // conservative for now, but can be improved. They currently use a
5220 // mutex/condvar pair, plus _counter.
5221 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5222 // sets count to 1 and signals condvar. Only one thread ever waits
5223 // on the condvar. Contention seen when trying to park implies that someone
5224 // is unparking you, so don't wait. And spurious returns are fine, so there
5225 // is no need to track notifications.
5226
5227 #define MAX_SECS 100000000
5228
5229 // This code is common to linux and solaris and will be moved to a
5230 // common place in dolphin.
5231 //
5232 // The passed in time value is either a relative time in nanoseconds
5233 // or an absolute time in milliseconds. Either way it has to be unpacked
5234 // into suitable seconds and nanoseconds components and stored in the
5235 // given timespec structure.
5236 // Given time is a 64-bit value and the time_t used in the timespec is only
5237 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5238 // overflow if times way in the future are given. Further on Solaris versions
5239 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5240 // number of seconds, in abstime, is less than current_time + 100,000,000.
5241 // As it will be 28 years before "now + 100000000" will overflow we can
5242 // ignore overflow and just impose a hard-limit on seconds using the value
5243 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5244 // years from "now".
5245 //
5246 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5247 assert(time > 0, "convertTime");
5248
5249 struct timeval now;
5250 int status = gettimeofday(&now, NULL);
5251 assert(status == 0, "gettimeofday");
5252
5253 time_t max_secs = now.tv_sec + MAX_SECS;
5254
5255 if (isAbsolute) {
5256 jlong secs = time / 1000;
5257 if (secs > max_secs) {
5258 absTime->tv_sec = max_secs;
5259 } else {
5260 absTime->tv_sec = secs;
5261 }
5262 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5263 } else {
5264 jlong secs = time / NANOSECS_PER_SEC;
5265 if (secs >= MAX_SECS) {
5266 absTime->tv_sec = max_secs;
5267 absTime->tv_nsec = 0;
5268 } else {
5269 absTime->tv_sec = now.tv_sec + secs;
5270 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5271 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5272 absTime->tv_nsec -= NANOSECS_PER_SEC;
5273 ++absTime->tv_sec; // note: this must be <= max_secs
5274 }
5275 }
5276 }
5277 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5278 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5279 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5280 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5281 }
5282
5283 void Parker::park(bool isAbsolute, jlong time) {
5284 // Ideally we'd do something useful while spinning, such
5285 // as calling unpackTime().
5286
5287 // Optional fast-path check:
5288 // Return immediately if a permit is available.
5289 // We depend on Atomic::xchg() having full barrier semantics
5290 // since we are doing a lock-free update to _counter.
5291 if (Atomic::xchg(0, &_counter) > 0) return;
5292
5293 // Optional fast-exit: Check interrupt before trying to wait
5294 Thread* thread = Thread::current();
5295 assert(thread->is_Java_thread(), "Must be JavaThread");
5296 JavaThread *jt = (JavaThread *)thread;
5297 if (Thread::is_interrupted(thread, false)) {
5298 return;
5299 }
5300
5301 // First, demultiplex/decode time arguments
5302 timespec absTime;
5303 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5304 return;
5305 }
5306 if (time > 0) {
5307 // Warning: this code might be exposed to the old Solaris time
5308 // round-down bugs. Grep "roundingFix" for details.
5309 unpackTime(&absTime, isAbsolute, time);
5310 }
5311
5312 // Enter safepoint region
5313 // Beware of deadlocks such as 6317397.
5314 // The per-thread Parker:: _mutex is a classic leaf-lock.
5315 // In particular a thread must never block on the Threads_lock while
5316 // holding the Parker:: mutex. If safepoints are pending both the
5317 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5318 ThreadBlockInVM tbivm(jt);
5319
5320 // Don't wait if cannot get lock since interference arises from
5321 // unblocking. Also. check interrupt before trying wait
5322 if (Thread::is_interrupted(thread, false) ||
5323 os::Solaris::mutex_trylock(_mutex) != 0) {
5324 return;
5325 }
5326
5327 int status;
5328
5329 if (_counter > 0) { // no wait needed
5330 _counter = 0;
5331 status = os::Solaris::mutex_unlock(_mutex);
5332 assert(status == 0, "invariant");
5333 // Paranoia to ensure our locked and lock-free paths interact
5334 // correctly with each other and Java-level accesses.
5335 OrderAccess::fence();
5336 return;
5337 }
5338
5339 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5340 jt->set_suspend_equivalent();
5341 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5342
5343 // Do this the hard way by blocking ...
5344 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5345 if (time == 0) {
5346 status = os::Solaris::cond_wait(_cond, _mutex);
5347 } else {
5348 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5349 }
5350 // Note that an untimed cond_wait() can sometimes return ETIME on older
5351 // versions of the Solaris.
5352 assert_status(status == 0 || status == EINTR ||
5353 status == ETIME || status == ETIMEDOUT,
5354 status, "cond_timedwait");
5355
5356 _counter = 0;
5357 status = os::Solaris::mutex_unlock(_mutex);
5358 assert_status(status == 0, status, "mutex_unlock");
5359 // Paranoia to ensure our locked and lock-free paths interact
5360 // correctly with each other and Java-level accesses.
5361 OrderAccess::fence();
5362
5363 // If externally suspended while waiting, re-suspend
5364 if (jt->handle_special_suspend_equivalent_condition()) {
5365 jt->java_suspend_self();
5366 }
5367 }
5368
5369 void Parker::unpark() {
5370 int status = os::Solaris::mutex_lock(_mutex);
5371 assert(status == 0, "invariant");
5372 const int s = _counter;
5373 _counter = 1;
5374 status = os::Solaris::mutex_unlock(_mutex);
5375 assert(status == 0, "invariant");
5376
5377 if (s < 1) {
5378 status = os::Solaris::cond_signal(_cond);
5379 assert(status == 0, "invariant");
5380 }
5381 }
5382
5383 extern char** environ;
5384
5385 // Run the specified command in a separate process. Return its exit value,
5386 // or -1 on failure (e.g. can't fork a new process).
5387 // Unlike system(), this function can be called from signal handler. It
5388 // doesn't block SIGINT et al.
5389 int os::fork_and_exec(char* cmd) {
5390 char * argv[4];
5391 argv[0] = (char *)"sh";
5392 argv[1] = (char *)"-c";
5393 argv[2] = cmd;
5394 argv[3] = NULL;
5395
5396 // fork is async-safe, fork1 is not so can't use in signal handler
5397 pid_t pid;
5398 Thread* t = Thread::current_or_null_safe();
5399 if (t != NULL && t->is_inside_signal_handler()) {
5400 pid = fork();
5401 } else {
5402 pid = fork1();
5403 }
5404
5405 if (pid < 0) {
5406 // fork failed
5407 warning("fork failed: %s", os::strerror(errno));
5408 return -1;
5409
5410 } else if (pid == 0) {
5411 // child process
5412
5413 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5414 execve("/usr/bin/sh", argv, environ);
5415
5416 // execve failed
5417 _exit(-1);
5418
5419 } else {
5420 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5421 // care about the actual exit code, for now.
5422
5423 int status;
5424
5425 // Wait for the child process to exit. This returns immediately if
5426 // the child has already exited. */
5427 while (waitpid(pid, &status, 0) < 0) {
5428 switch (errno) {
5429 case ECHILD: return 0;
5430 case EINTR: break;
5431 default: return -1;
5432 }
5433 }
5434
5435 if (WIFEXITED(status)) {
5436 // The child exited normally; get its exit code.
5437 return WEXITSTATUS(status);
5438 } else if (WIFSIGNALED(status)) {
5439 // The child exited because of a signal
5440 // The best value to return is 0x80 + signal number,
5441 // because that is what all Unix shells do, and because
5442 // it allows callers to distinguish between process exit and
5443 // process death by signal.
5444 return 0x80 + WTERMSIG(status);
5445 } else {
5446 // Unknown exit code; pass it through
5447 return status;
5448 }
5449 }
5450 }
5451
5452 // is_headless_jre()
5453 //
5454 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5455 // in order to report if we are running in a headless jre
5456 //
5457 // Since JDK8 xawt/libmawt.so was moved into the same directory
5458 // as libawt.so, and renamed libawt_xawt.so
5459 //
5460 bool os::is_headless_jre() {
5461 struct stat statbuf;
5462 char buf[MAXPATHLEN];
5463 char libmawtpath[MAXPATHLEN];
5464 const char *xawtstr = "/xawt/libmawt.so";
5465 const char *new_xawtstr = "/libawt_xawt.so";
5466 char *p;
5467
5468 // Get path to libjvm.so
5469 os::jvm_path(buf, sizeof(buf));
5470
5471 // Get rid of libjvm.so
5472 p = strrchr(buf, '/');
5473 if (p == NULL) {
5474 return false;
5475 } else {
5476 *p = '\0';
5477 }
5478
5479 // Get rid of client or server
5480 p = strrchr(buf, '/');
5481 if (p == NULL) {
5482 return false;
5483 } else {
5484 *p = '\0';
5485 }
5486
5487 // check xawt/libmawt.so
5488 strcpy(libmawtpath, buf);
5489 strcat(libmawtpath, xawtstr);
5490 if (::stat(libmawtpath, &statbuf) == 0) return false;
5491
5492 // check libawt_xawt.so
5493 strcpy(libmawtpath, buf);
5494 strcat(libmawtpath, new_xawtstr);
5495 if (::stat(libmawtpath, &statbuf) == 0) return false;
5496
5497 return true;
5498 }
5499
5500 int os::close(int fd) {
5501 return ::close(fd);
5502 }
5503
5504 int os::socket_close(int fd) {
5505 return ::close(fd);
5506 }
5507
5508 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5509 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5510 "Assumed _thread_in_native");
5511 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5512 }
5513
5514 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5515 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5516 "Assumed _thread_in_native");
5517 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5518 }
5519
5520 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5521 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5522 }
5523
5524 // As both poll and select can be interrupted by signals, we have to be
5525 // prepared to restart the system call after updating the timeout, unless
5526 // a poll() is done with timeout == -1, in which case we repeat with this
5527 // "wait forever" value.
5528
5529 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5530 int _result;
5531 _result = ::connect(fd, him, len);
5532
5533 // On Solaris, when a connect() call is interrupted, the connection
5534 // can be established asynchronously (see 6343810). Subsequent calls
5535 // to connect() must check the errno value which has the semantic
5536 // described below (copied from the connect() man page). Handling
5537 // of asynchronously established connections is required for both
5538 // blocking and non-blocking sockets.
5539 // EINTR The connection attempt was interrupted
5540 // before any data arrived by the delivery of
5541 // a signal. The connection, however, will be
5542 // established asynchronously.
5543 //
5544 // EINPROGRESS The socket is non-blocking, and the connec-
5545 // tion cannot be completed immediately.
5546 //
5547 // EALREADY The socket is non-blocking, and a previous
5548 // connection attempt has not yet been com-
5549 // pleted.
5550 //
5551 // EISCONN The socket is already connected.
5552 if (_result == OS_ERR && errno == EINTR) {
5553 // restarting a connect() changes its errno semantics
5554 RESTARTABLE(::connect(fd, him, len), _result);
5555 // undo these changes
5556 if (_result == OS_ERR) {
5557 if (errno == EALREADY) {
5558 errno = EINPROGRESS; // fall through
5559 } else if (errno == EISCONN) {
5560 errno = 0;
5561 return OS_OK;
5562 }
5563 }
5564 }
5565 return _result;
5566 }
5567
5568 // Get the default path to the core file
5569 // Returns the length of the string
5570 int os::get_core_path(char* buffer, size_t bufferSize) {
5571 const char* p = get_current_directory(buffer, bufferSize);
5572
5573 if (p == NULL) {
5574 assert(p != NULL, "failed to get current directory");
5575 return 0;
5576 }
5577
5578 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5579 p, current_process_id());
5580
5581 return strlen(buffer);
5582 }
5583
5584 #ifndef PRODUCT
5585 void TestReserveMemorySpecial_test() {
5586 // No tests available for this platform
5587 }
5588 #endif
5589
5590 bool os::start_debugging(char *buf, int buflen) {
5591 int len = (int)strlen(buf);
5592 char *p = &buf[len];
5593
5594 jio_snprintf(p, buflen-len,
5595 "\n\n"
5596 "Do you want to debug the problem?\n\n"
5597 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5598 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5599 "Otherwise, press RETURN to abort...",
5600 os::current_process_id(), os::current_thread_id());
5601
5602 bool yes = os::message_box("Unexpected Error", buf);
5603
5604 if (yes) {
5605 // yes, user asked VM to launch debugger
5606 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5607
5608 os::fork_and_exec(buf);
5609 yes = false;
5610 }
5611 return yes;
5612 }