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, allowdebug_blocked_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 sigemptyset(&allowdebug_blocked_sigs);
1049 sigaddset(&unblocked_sigs, SIGILL);
1050 sigaddset(&unblocked_sigs, SIGSEGV);
1051 sigaddset(&unblocked_sigs, SIGBUS);
1052 sigaddset(&unblocked_sigs, SIGFPE);
1053 sigaddset(&unblocked_sigs, ASYNC_SIGNAL);
1054
1055 if (!ReduceSignalUsage) {
1056 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1057 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1058 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1059 }
1060 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1061 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1062 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1063 }
1064 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1065 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1066 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1067 }
1068 }
1069 // Fill in signals that are blocked by all but the VM thread.
1070 sigemptyset(&vm_sigs);
1071 if (!ReduceSignalUsage) {
1072 sigaddset(&vm_sigs, BREAK_SIGNAL);
1073 }
1074 debug_only(signal_sets_initialized = true);
1075
1076 // For diagnostics only used in run_periodic_checks
1077 sigemptyset(&check_signal_done);
1078 }
1079
1080 // These are signals that are unblocked while a thread is running Java.
1081 // (For some reason, they get blocked by default.)
1082 sigset_t* os::Solaris::unblocked_signals() {
1083 assert(signal_sets_initialized, "Not initialized");
1084 return &unblocked_sigs;
1085 }
1086
1087 // These are the signals that are blocked while a (non-VM) thread is
1088 // running Java. Only the VM thread handles these signals.
1089 sigset_t* os::Solaris::vm_signals() {
1090 assert(signal_sets_initialized, "Not initialized");
1091 return &vm_sigs;
1092 }
1093
1094 // These are signals that are blocked during cond_wait to allow debugger in
1095 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1096 assert(signal_sets_initialized, "Not initialized");
1097 return &allowdebug_blocked_sigs;
1098 }
1099
1100
1101 void _handle_uncaught_cxx_exception() {
1102 VMError::report_and_die("An uncaught C++ exception");
1103 }
1104
1105
1106 // First crack at OS-specific initialization, from inside the new thread.
1107 void os::initialize_thread(Thread* thr) {
1108 int r = thr_main();
1109 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1110 if (r) {
1111 JavaThread* jt = (JavaThread *)thr;
1112 assert(jt != NULL, "Sanity check");
1113 size_t stack_size;
1114 address base = jt->stack_base();
1115 if (Arguments::created_by_java_launcher()) {
1116 // Use 2MB to allow for Solaris 7 64 bit mode.
1117 stack_size = JavaThread::stack_size_at_create() == 0
1118 ? 2048*K : JavaThread::stack_size_at_create();
1119
1120 // There are rare cases when we may have already used more than
1121 // the basic stack size allotment before this method is invoked.
1122 // Attempt to allow for a normally sized java_stack.
1123 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1124 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1125 } else {
1126 // 6269555: If we were not created by a Java launcher, i.e. if we are
1127 // running embedded in a native application, treat the primordial thread
1128 // as much like a native attached thread as possible. This means using
1129 // the current stack size from thr_stksegment(), unless it is too large
1130 // to reliably setup guard pages. A reasonable max size is 8MB.
1131 size_t current_size = current_stack_size();
1132 // This should never happen, but just in case....
1133 if (current_size == 0) current_size = 2 * K * K;
1134 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1135 }
1136 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1137 stack_size = (size_t)(base - bottom);
1138
1139 assert(stack_size > 0, "Stack size calculation problem");
1140
1141 if (stack_size > jt->stack_size()) {
1142 #ifndef PRODUCT
1143 struct rlimit limits;
1144 getrlimit(RLIMIT_STACK, &limits);
1145 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1146 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1147 #endif
1148 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1149 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1150 "See limit(1) to increase the stack size limit.",
1151 stack_size / K, jt->stack_size() / K);
1152 vm_exit(1);
1153 }
1154 assert(jt->stack_size() >= stack_size,
1155 "Attempt to map more stack than was allocated");
1156 jt->set_stack_size(stack_size);
1157 }
1158
1159 // With the T2 libthread (T1 is no longer supported) threads are always bound
1160 // and we use stackbanging in all cases.
1161
1162 os::Solaris::init_thread_fpu_state();
1163 std::set_terminate(_handle_uncaught_cxx_exception);
1164 }
1165
1166
1167
1168 // Free Solaris resources related to the OSThread
1169 void os::free_thread(OSThread* osthread) {
1170 assert(osthread != NULL, "os::free_thread but osthread not set");
1171
1172 // We are told to free resources of the argument thread,
1173 // but we can only really operate on the current thread.
1174 assert(Thread::current()->osthread() == osthread,
1175 "os::free_thread but not current thread");
1176
1177 // Restore caller's signal mask
1178 sigset_t sigmask = osthread->caller_sigmask();
1179 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1180
1181 delete osthread;
1182 }
1183
1184 void os::pd_start_thread(Thread* thread) {
1185 int status = thr_continue(thread->osthread()->thread_id());
1186 assert_status(status == 0, status, "thr_continue failed");
1187 }
1188
1189
1190 intx os::current_thread_id() {
1191 return (intx)thr_self();
1192 }
1193
1194 static pid_t _initial_pid = 0;
1195
1196 int os::current_process_id() {
1197 return (int)(_initial_pid ? _initial_pid : getpid());
1198 }
1199
1200 // gethrtime() should be monotonic according to the documentation,
1201 // but some virtualized platforms are known to break this guarantee.
1202 // getTimeNanos() must be guaranteed not to move backwards, so we
1203 // are forced to add a check here.
1204 inline hrtime_t getTimeNanos() {
1205 const hrtime_t now = gethrtime();
1206 const hrtime_t prev = max_hrtime;
1207 if (now <= prev) {
1208 return prev; // same or retrograde time;
1209 }
1210 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1211 assert(obsv >= prev, "invariant"); // Monotonicity
1212 // If the CAS succeeded then we're done and return "now".
1213 // If the CAS failed and the observed value "obsv" is >= now then
1214 // we should return "obsv". If the CAS failed and now > obsv > prv then
1215 // some other thread raced this thread and installed a new value, in which case
1216 // we could either (a) retry the entire operation, (b) retry trying to install now
1217 // or (c) just return obsv. We use (c). No loop is required although in some cases
1218 // we might discard a higher "now" value in deference to a slightly lower but freshly
1219 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1220 // to (a) or (b) -- and greatly reduces coherence traffic.
1221 // We might also condition (c) on the magnitude of the delta between obsv and now.
1222 // Avoiding excessive CAS operations to hot RW locations is critical.
1223 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1224 return (prev == obsv) ? now : obsv;
1225 }
1226
1227 // Time since start-up in seconds to a fine granularity.
1228 // Used by VMSelfDestructTimer and the MemProfiler.
1229 double os::elapsedTime() {
1230 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1231 }
1232
1233 jlong os::elapsed_counter() {
1234 return (jlong)(getTimeNanos() - first_hrtime);
1235 }
1236
1237 jlong os::elapsed_frequency() {
1238 return hrtime_hz;
1239 }
1240
1241 // Return the real, user, and system times in seconds from an
1242 // arbitrary fixed point in the past.
1243 bool os::getTimesSecs(double* process_real_time,
1244 double* process_user_time,
1245 double* process_system_time) {
1246 struct tms ticks;
1247 clock_t real_ticks = times(&ticks);
1248
1249 if (real_ticks == (clock_t) (-1)) {
1250 return false;
1251 } else {
1252 double ticks_per_second = (double) clock_tics_per_sec;
1253 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1254 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1255 // For consistency return the real time from getTimeNanos()
1256 // converted to seconds.
1257 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1258
1259 return true;
1260 }
1261 }
1262
1263 bool os::supports_vtime() { return true; }
1264 bool os::enable_vtime() { return false; }
1265 bool os::vtime_enabled() { return false; }
1266
1267 double os::elapsedVTime() {
1268 return (double)gethrvtime() / (double)hrtime_hz;
1269 }
1270
1271 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1272 jlong os::javaTimeMillis() {
1273 timeval t;
1274 if (gettimeofday(&t, NULL) == -1) {
1275 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1276 }
1277 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1278 }
1279
1280 // Must return seconds+nanos since Jan 1 1970. This must use the same
1281 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1282 // we need better than 1ms accuracy
1283 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1284 timeval t;
1285 if (gettimeofday(&t, NULL) == -1) {
1286 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1287 }
1288 seconds = jlong(t.tv_sec);
1289 nanos = jlong(t.tv_usec) * 1000;
1290 }
1291
1292
1293 jlong os::javaTimeNanos() {
1294 return (jlong)getTimeNanos();
1295 }
1296
1297 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1298 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1299 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1300 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1301 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1302 }
1303
1304 char * os::local_time_string(char *buf, size_t buflen) {
1305 struct tm t;
1306 time_t long_time;
1307 time(&long_time);
1308 localtime_r(&long_time, &t);
1309 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1310 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1311 t.tm_hour, t.tm_min, t.tm_sec);
1312 return buf;
1313 }
1314
1315 // Note: os::shutdown() might be called very early during initialization, or
1316 // called from signal handler. Before adding something to os::shutdown(), make
1317 // sure it is async-safe and can handle partially initialized VM.
1318 void os::shutdown() {
1319
1320 // allow PerfMemory to attempt cleanup of any persistent resources
1321 perfMemory_exit();
1322
1323 // needs to remove object in file system
1324 AttachListener::abort();
1325
1326 // flush buffered output, finish log files
1327 ostream_abort();
1328
1329 // Check for abort hook
1330 abort_hook_t abort_hook = Arguments::abort_hook();
1331 if (abort_hook != NULL) {
1332 abort_hook();
1333 }
1334 }
1335
1336 // Note: os::abort() might be called very early during initialization, or
1337 // called from signal handler. Before adding something to os::abort(), make
1338 // sure it is async-safe and can handle partially initialized VM.
1339 void os::abort(bool dump_core, void* siginfo, const void* context) {
1340 os::shutdown();
1341 if (dump_core) {
1342 #ifndef PRODUCT
1343 fdStream out(defaultStream::output_fd());
1344 out.print_raw("Current thread is ");
1345 char buf[16];
1346 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1347 out.print_raw_cr(buf);
1348 out.print_raw_cr("Dumping core ...");
1349 #endif
1350 ::abort(); // dump core (for debugging)
1351 }
1352
1353 ::exit(1);
1354 }
1355
1356 // Die immediately, no exit hook, no abort hook, no cleanup.
1357 void os::die() {
1358 ::abort(); // dump core (for debugging)
1359 }
1360
1361 // DLL functions
1362
1363 const char* os::dll_file_extension() { return ".so"; }
1364
1365 // This must be hard coded because it's the system's temporary
1366 // directory not the java application's temp directory, ala java.io.tmpdir.
1367 const char* os::get_temp_directory() { return "/tmp"; }
1368
1369 static bool file_exists(const char* filename) {
1370 struct stat statbuf;
1371 if (filename == NULL || strlen(filename) == 0) {
1372 return false;
1373 }
1374 return os::stat(filename, &statbuf) == 0;
1375 }
1376
1377 bool os::dll_build_name(char* buffer, size_t buflen,
1378 const char* pname, const char* fname) {
1379 bool retval = false;
1380 const size_t pnamelen = pname ? strlen(pname) : 0;
1381
1382 // Return error on buffer overflow.
1383 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1384 return retval;
1385 }
1386
1387 if (pnamelen == 0) {
1388 snprintf(buffer, buflen, "lib%s.so", fname);
1389 retval = true;
1390 } else if (strchr(pname, *os::path_separator()) != NULL) {
1391 int n;
1392 char** pelements = split_path(pname, &n);
1393 if (pelements == NULL) {
1394 return false;
1395 }
1396 for (int i = 0; i < n; i++) {
1397 // really shouldn't be NULL but what the heck, check can't hurt
1398 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1399 continue; // skip the empty path values
1400 }
1401 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1402 if (file_exists(buffer)) {
1403 retval = true;
1404 break;
1405 }
1406 }
1407 // release the storage
1408 for (int i = 0; i < n; i++) {
1409 if (pelements[i] != NULL) {
1410 FREE_C_HEAP_ARRAY(char, pelements[i]);
1411 }
1412 }
1413 if (pelements != NULL) {
1414 FREE_C_HEAP_ARRAY(char*, pelements);
1415 }
1416 } else {
1417 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1418 retval = true;
1419 }
1420 return retval;
1421 }
1422
1423 // check if addr is inside libjvm.so
1424 bool os::address_is_in_vm(address addr) {
1425 static address libjvm_base_addr;
1426 Dl_info dlinfo;
1427
1428 if (libjvm_base_addr == NULL) {
1429 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1430 libjvm_base_addr = (address)dlinfo.dli_fbase;
1431 }
1432 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1433 }
1434
1435 if (dladdr((void *)addr, &dlinfo) != 0) {
1436 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1437 }
1438
1439 return false;
1440 }
1441
1442 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1443 static dladdr1_func_type dladdr1_func = NULL;
1444
1445 bool os::dll_address_to_function_name(address addr, char *buf,
1446 int buflen, int * offset,
1447 bool demangle) {
1448 // buf is not optional, but offset is optional
1449 assert(buf != NULL, "sanity check");
1450
1451 Dl_info dlinfo;
1452
1453 // dladdr1_func was initialized in os::init()
1454 if (dladdr1_func != NULL) {
1455 // yes, we have dladdr1
1456
1457 // Support for dladdr1 is checked at runtime; it may be
1458 // available even if the vm is built on a machine that does
1459 // not have dladdr1 support. Make sure there is a value for
1460 // RTLD_DL_SYMENT.
1461 #ifndef RTLD_DL_SYMENT
1462 #define RTLD_DL_SYMENT 1
1463 #endif
1464 #ifdef _LP64
1465 Elf64_Sym * info;
1466 #else
1467 Elf32_Sym * info;
1468 #endif
1469 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1470 RTLD_DL_SYMENT) != 0) {
1471 // see if we have a matching symbol that covers our address
1472 if (dlinfo.dli_saddr != NULL &&
1473 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1474 if (dlinfo.dli_sname != NULL) {
1475 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1476 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1477 }
1478 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1479 return true;
1480 }
1481 }
1482 // no matching symbol so try for just file info
1483 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1484 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1485 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1486 return true;
1487 }
1488 }
1489 }
1490 buf[0] = '\0';
1491 if (offset != NULL) *offset = -1;
1492 return false;
1493 }
1494
1495 // no, only dladdr is available
1496 if (dladdr((void *)addr, &dlinfo) != 0) {
1497 // see if we have a matching symbol
1498 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1499 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1500 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1501 }
1502 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1503 return true;
1504 }
1505 // no matching symbol so try for just file info
1506 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1507 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1508 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1509 return true;
1510 }
1511 }
1512 }
1513 buf[0] = '\0';
1514 if (offset != NULL) *offset = -1;
1515 return false;
1516 }
1517
1518 bool os::dll_address_to_library_name(address addr, char* buf,
1519 int buflen, int* offset) {
1520 // buf is not optional, but offset is optional
1521 assert(buf != NULL, "sanity check");
1522
1523 Dl_info dlinfo;
1524
1525 if (dladdr((void*)addr, &dlinfo) != 0) {
1526 if (dlinfo.dli_fname != NULL) {
1527 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1528 }
1529 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1530 *offset = addr - (address)dlinfo.dli_fbase;
1531 }
1532 return true;
1533 }
1534
1535 buf[0] = '\0';
1536 if (offset) *offset = -1;
1537 return false;
1538 }
1539
1540 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1541 Dl_info dli;
1542 // Sanity check?
1543 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1544 dli.dli_fname == NULL) {
1545 return 1;
1546 }
1547
1548 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1549 if (handle == NULL) {
1550 return 1;
1551 }
1552
1553 Link_map *map;
1554 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1555 if (map == NULL) {
1556 dlclose(handle);
1557 return 1;
1558 }
1559
1560 while (map->l_prev != NULL) {
1561 map = map->l_prev;
1562 }
1563
1564 while (map != NULL) {
1565 // Iterate through all map entries and call callback with fields of interest
1566 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1567 dlclose(handle);
1568 return 1;
1569 }
1570 map = map->l_next;
1571 }
1572
1573 dlclose(handle);
1574 return 0;
1575 }
1576
1577 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1578 outputStream * out = (outputStream *) param;
1579 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1580 return 0;
1581 }
1582
1583 void os::print_dll_info(outputStream * st) {
1584 st->print_cr("Dynamic libraries:"); st->flush();
1585 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1586 st->print_cr("Error: Cannot print dynamic libraries.");
1587 }
1588 }
1589
1590 // Loads .dll/.so and
1591 // in case of error it checks if .dll/.so was built for the
1592 // same architecture as Hotspot is running on
1593
1594 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1595 void * result= ::dlopen(filename, RTLD_LAZY);
1596 if (result != NULL) {
1597 // Successful loading
1598 return result;
1599 }
1600
1601 Elf32_Ehdr elf_head;
1602
1603 // Read system error message into ebuf
1604 // It may or may not be overwritten below
1605 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1606 ebuf[ebuflen-1]='\0';
1607 int diag_msg_max_length=ebuflen-strlen(ebuf);
1608 char* diag_msg_buf=ebuf+strlen(ebuf);
1609
1610 if (diag_msg_max_length==0) {
1611 // No more space in ebuf for additional diagnostics message
1612 return NULL;
1613 }
1614
1615
1616 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1617
1618 if (file_descriptor < 0) {
1619 // Can't open library, report dlerror() message
1620 return NULL;
1621 }
1622
1623 bool failed_to_read_elf_head=
1624 (sizeof(elf_head)!=
1625 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1626
1627 ::close(file_descriptor);
1628 if (failed_to_read_elf_head) {
1629 // file i/o error - report dlerror() msg
1630 return NULL;
1631 }
1632
1633 typedef struct {
1634 Elf32_Half code; // Actual value as defined in elf.h
1635 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1636 char elf_class; // 32 or 64 bit
1637 char endianess; // MSB or LSB
1638 char* name; // String representation
1639 } arch_t;
1640
1641 static const arch_t arch_array[]={
1642 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1643 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1644 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1645 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1646 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1647 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1648 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1649 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1650 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1651 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1652 };
1653
1654 #if (defined IA32)
1655 static Elf32_Half running_arch_code=EM_386;
1656 #elif (defined AMD64)
1657 static Elf32_Half running_arch_code=EM_X86_64;
1658 #elif (defined IA64)
1659 static Elf32_Half running_arch_code=EM_IA_64;
1660 #elif (defined __sparc) && (defined _LP64)
1661 static Elf32_Half running_arch_code=EM_SPARCV9;
1662 #elif (defined __sparc) && (!defined _LP64)
1663 static Elf32_Half running_arch_code=EM_SPARC;
1664 #elif (defined __powerpc64__)
1665 static Elf32_Half running_arch_code=EM_PPC64;
1666 #elif (defined __powerpc__)
1667 static Elf32_Half running_arch_code=EM_PPC;
1668 #elif (defined ARM)
1669 static Elf32_Half running_arch_code=EM_ARM;
1670 #else
1671 #error Method os::dll_load requires that one of following is defined:\
1672 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1673 #endif
1674
1675 // Identify compatability class for VM's architecture and library's architecture
1676 // Obtain string descriptions for architectures
1677
1678 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1679 int running_arch_index=-1;
1680
1681 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1682 if (running_arch_code == arch_array[i].code) {
1683 running_arch_index = i;
1684 }
1685 if (lib_arch.code == arch_array[i].code) {
1686 lib_arch.compat_class = arch_array[i].compat_class;
1687 lib_arch.name = arch_array[i].name;
1688 }
1689 }
1690
1691 assert(running_arch_index != -1,
1692 "Didn't find running architecture code (running_arch_code) in arch_array");
1693 if (running_arch_index == -1) {
1694 // Even though running architecture detection failed
1695 // we may still continue with reporting dlerror() message
1696 return NULL;
1697 }
1698
1699 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1700 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1701 return NULL;
1702 }
1703
1704 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1705 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1706 return NULL;
1707 }
1708
1709 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1710 if (lib_arch.name!=NULL) {
1711 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1712 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1713 lib_arch.name, arch_array[running_arch_index].name);
1714 } else {
1715 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1716 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1717 lib_arch.code,
1718 arch_array[running_arch_index].name);
1719 }
1720 }
1721
1722 return NULL;
1723 }
1724
1725 void* os::dll_lookup(void* handle, const char* name) {
1726 return dlsym(handle, name);
1727 }
1728
1729 void* os::get_default_process_handle() {
1730 return (void*)::dlopen(NULL, RTLD_LAZY);
1731 }
1732
1733 int os::stat(const char *path, struct stat *sbuf) {
1734 char pathbuf[MAX_PATH];
1735 if (strlen(path) > MAX_PATH - 1) {
1736 errno = ENAMETOOLONG;
1737 return -1;
1738 }
1739 os::native_path(strcpy(pathbuf, path));
1740 return ::stat(pathbuf, sbuf);
1741 }
1742
1743 static inline time_t get_mtime(const char* filename) {
1744 struct stat st;
1745 int ret = os::stat(filename, &st);
1746 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1747 return st.st_mtime;
1748 }
1749
1750 int os::compare_file_modified_times(const char* file1, const char* file2) {
1751 time_t t1 = get_mtime(file1);
1752 time_t t2 = get_mtime(file2);
1753 return t1 - t2;
1754 }
1755
1756 static bool _print_ascii_file(const char* filename, outputStream* st) {
1757 int fd = ::open(filename, O_RDONLY);
1758 if (fd == -1) {
1759 return false;
1760 }
1761
1762 char buf[32];
1763 int bytes;
1764 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1765 st->print_raw(buf, bytes);
1766 }
1767
1768 ::close(fd);
1769
1770 return true;
1771 }
1772
1773 void os::print_os_info_brief(outputStream* st) {
1774 os::Solaris::print_distro_info(st);
1775
1776 os::Posix::print_uname_info(st);
1777
1778 os::Solaris::print_libversion_info(st);
1779 }
1780
1781 void os::print_os_info(outputStream* st) {
1782 st->print("OS:");
1783
1784 os::Solaris::print_distro_info(st);
1785
1786 os::Posix::print_uname_info(st);
1787
1788 os::Solaris::print_libversion_info(st);
1789
1790 os::Posix::print_rlimit_info(st);
1791
1792 os::Posix::print_load_average(st);
1793 }
1794
1795 void os::Solaris::print_distro_info(outputStream* st) {
1796 if (!_print_ascii_file("/etc/release", st)) {
1797 st->print("Solaris");
1798 }
1799 st->cr();
1800 }
1801
1802 void os::get_summary_os_info(char* buf, size_t buflen) {
1803 strncpy(buf, "Solaris", buflen); // default to plain solaris
1804 FILE* fp = fopen("/etc/release", "r");
1805 if (fp != NULL) {
1806 char tmp[256];
1807 // Only get the first line and chop out everything but the os name.
1808 if (fgets(tmp, sizeof(tmp), fp)) {
1809 char* ptr = tmp;
1810 // skip past whitespace characters
1811 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1812 if (*ptr != '\0') {
1813 char* nl = strchr(ptr, '\n');
1814 if (nl != NULL) *nl = '\0';
1815 strncpy(buf, ptr, buflen);
1816 }
1817 }
1818 fclose(fp);
1819 }
1820 }
1821
1822 void os::Solaris::print_libversion_info(outputStream* st) {
1823 st->print(" (T2 libthread)");
1824 st->cr();
1825 }
1826
1827 static bool check_addr0(outputStream* st) {
1828 jboolean status = false;
1829 const int read_chunk = 200;
1830 int ret = 0;
1831 int nmap = 0;
1832 int fd = ::open("/proc/self/map",O_RDONLY);
1833 if (fd >= 0) {
1834 prmap_t *p = NULL;
1835 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1836 if (NULL == mbuff) {
1837 ::close(fd);
1838 return status;
1839 }
1840 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1841 //check if read() has not read partial data
1842 if( 0 != ret % sizeof(prmap_t)){
1843 break;
1844 }
1845 nmap = ret / sizeof(prmap_t);
1846 p = (prmap_t *)mbuff;
1847 for(int i = 0; i < nmap; i++){
1848 if (p->pr_vaddr == 0x0) {
1849 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1850 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1851 st->print("Access: ");
1852 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1853 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1854 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1855 st->cr();
1856 status = true;
1857 }
1858 p++;
1859 }
1860 }
1861 free(mbuff);
1862 ::close(fd);
1863 }
1864 return status;
1865 }
1866
1867 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1868 // Get MHz with system call. We don't seem to already have this.
1869 processor_info_t stats;
1870 processorid_t id = getcpuid();
1871 int clock = 0;
1872 if (processor_info(id, &stats) != -1) {
1873 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1874 }
1875 #ifdef AMD64
1876 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1877 #else
1878 // must be sparc
1879 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1880 #endif
1881 }
1882
1883 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1884 // Nothing to do for now.
1885 }
1886
1887 void os::print_memory_info(outputStream* st) {
1888 st->print("Memory:");
1889 st->print(" %dk page", os::vm_page_size()>>10);
1890 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1891 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1892 st->cr();
1893 (void) check_addr0(st);
1894 }
1895
1896 // Moved from whole group, because we need them here for diagnostic
1897 // prints.
1898 static int Maxsignum = 0;
1899 static int *ourSigFlags = NULL;
1900
1901 int os::Solaris::get_our_sigflags(int sig) {
1902 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1903 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1904 return ourSigFlags[sig];
1905 }
1906
1907 void os::Solaris::set_our_sigflags(int sig, int flags) {
1908 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1909 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1910 ourSigFlags[sig] = flags;
1911 }
1912
1913
1914 static const char* get_signal_handler_name(address handler,
1915 char* buf, int buflen) {
1916 int offset;
1917 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1918 if (found) {
1919 // skip directory names
1920 const char *p1, *p2;
1921 p1 = buf;
1922 size_t len = strlen(os::file_separator());
1923 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1924 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1925 } else {
1926 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1927 }
1928 return buf;
1929 }
1930
1931 static void print_signal_handler(outputStream* st, int sig,
1932 char* buf, size_t buflen) {
1933 struct sigaction sa;
1934
1935 sigaction(sig, NULL, &sa);
1936
1937 st->print("%s: ", os::exception_name(sig, buf, buflen));
1938
1939 address handler = (sa.sa_flags & SA_SIGINFO)
1940 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1941 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1942
1943 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1944 st->print("SIG_DFL");
1945 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1946 st->print("SIG_IGN");
1947 } else {
1948 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1949 }
1950
1951 st->print(", sa_mask[0]=");
1952 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1953
1954 address rh = VMError::get_resetted_sighandler(sig);
1955 // May be, handler was resetted by VMError?
1956 if (rh != NULL) {
1957 handler = rh;
1958 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1959 }
1960
1961 st->print(", sa_flags=");
1962 os::Posix::print_sa_flags(st, sa.sa_flags);
1963
1964 // Check: is it our handler?
1965 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1966 // It is our signal handler
1967 // check for flags
1968 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1969 st->print(
1970 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1971 os::Solaris::get_our_sigflags(sig));
1972 }
1973 }
1974 st->cr();
1975 }
1976
1977 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1978 st->print_cr("Signal Handlers:");
1979 print_signal_handler(st, SIGSEGV, buf, buflen);
1980 print_signal_handler(st, SIGBUS , buf, buflen);
1981 print_signal_handler(st, SIGFPE , buf, buflen);
1982 print_signal_handler(st, SIGPIPE, buf, buflen);
1983 print_signal_handler(st, SIGXFSZ, buf, buflen);
1984 print_signal_handler(st, SIGILL , buf, buflen);
1985 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
1986 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1987 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
1988 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1989 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
1990 }
1991
1992 static char saved_jvm_path[MAXPATHLEN] = { 0 };
1993
1994 // Find the full path to the current module, libjvm.so
1995 void os::jvm_path(char *buf, jint buflen) {
1996 // Error checking.
1997 if (buflen < MAXPATHLEN) {
1998 assert(false, "must use a large-enough buffer");
1999 buf[0] = '\0';
2000 return;
2001 }
2002 // Lazy resolve the path to current module.
2003 if (saved_jvm_path[0] != 0) {
2004 strcpy(buf, saved_jvm_path);
2005 return;
2006 }
2007
2008 Dl_info dlinfo;
2009 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2010 assert(ret != 0, "cannot locate libjvm");
2011 if (ret != 0 && dlinfo.dli_fname != NULL) {
2012 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2013 return;
2014 }
2015 } else {
2016 buf[0] = '\0';
2017 return;
2018 }
2019
2020 if (Arguments::sun_java_launcher_is_altjvm()) {
2021 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2022 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2023 // If "/jre/lib/" appears at the right place in the string, then
2024 // assume we are installed in a JDK and we're done. Otherwise, check
2025 // for a JAVA_HOME environment variable and fix up the path so it
2026 // looks like libjvm.so is installed there (append a fake suffix
2027 // hotspot/libjvm.so).
2028 const char *p = buf + strlen(buf) - 1;
2029 for (int count = 0; p > buf && count < 5; ++count) {
2030 for (--p; p > buf && *p != '/'; --p)
2031 /* empty */ ;
2032 }
2033
2034 if (strncmp(p, "/jre/lib/", 9) != 0) {
2035 // Look for JAVA_HOME in the environment.
2036 char* java_home_var = ::getenv("JAVA_HOME");
2037 if (java_home_var != NULL && java_home_var[0] != 0) {
2038 char* jrelib_p;
2039 int len;
2040
2041 // Check the current module name "libjvm.so".
2042 p = strrchr(buf, '/');
2043 assert(strstr(p, "/libjvm") == p, "invalid library name");
2044
2045 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
2046 return;
2047 }
2048 // determine if this is a legacy image or modules image
2049 // modules image doesn't have "jre" subdirectory
2050 len = strlen(buf);
2051 assert(len < buflen, "Ran out of buffer space");
2052 jrelib_p = buf + len;
2053 snprintf(jrelib_p, buflen-len, "/jre/lib");
2054 if (0 != access(buf, F_OK)) {
2055 snprintf(jrelib_p, buflen-len, "/lib");
2056 }
2057
2058 if (0 == access(buf, F_OK)) {
2059 // Use current module name "libjvm.so"
2060 len = strlen(buf);
2061 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2062 } else {
2063 // Go back to path of .so
2064 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2065 return;
2066 }
2067 }
2068 }
2069 }
2070 }
2071
2072 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2073 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2074 }
2075
2076
2077 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2078 // no prefix required, not even "_"
2079 }
2080
2081
2082 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2083 // no suffix required
2084 }
2085
2086 // This method is a copy of JDK's sysGetLastErrorString
2087 // from src/solaris/hpi/src/system_md.c
2088
2089 size_t os::lasterror(char *buf, size_t len) {
2090 if (errno == 0) return 0;
2091
2092 const char *s = os::strerror(errno);
2093 size_t n = ::strlen(s);
2094 if (n >= len) {
2095 n = len - 1;
2096 }
2097 ::strncpy(buf, s, n);
2098 buf[n] = '\0';
2099 return n;
2100 }
2101
2102
2103 // sun.misc.Signal
2104
2105 extern "C" {
2106 static void UserHandler(int sig, void *siginfo, void *context) {
2107 // Ctrl-C is pressed during error reporting, likely because the error
2108 // handler fails to abort. Let VM die immediately.
2109 if (sig == SIGINT && is_error_reported()) {
2110 os::die();
2111 }
2112
2113 os::signal_notify(sig);
2114 // We do not need to reinstate the signal handler each time...
2115 }
2116 }
2117
2118 void* os::user_handler() {
2119 return CAST_FROM_FN_PTR(void*, UserHandler);
2120 }
2121
2122 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2123 struct timespec ts;
2124 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2125
2126 return ts;
2127 }
2128
2129 extern "C" {
2130 typedef void (*sa_handler_t)(int);
2131 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2132 }
2133
2134 void* os::signal(int signal_number, void* handler) {
2135 struct sigaction sigAct, oldSigAct;
2136 sigfillset(&(sigAct.sa_mask));
2137 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2138 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2139
2140 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2141 // -1 means registration failed
2142 return (void *)-1;
2143 }
2144
2145 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2146 }
2147
2148 void os::signal_raise(int signal_number) {
2149 raise(signal_number);
2150 }
2151
2152 // The following code is moved from os.cpp for making this
2153 // code platform specific, which it is by its very nature.
2154
2155 // a counter for each possible signal value
2156 static int Sigexit = 0;
2157 static jint *pending_signals = NULL;
2158 static int *preinstalled_sigs = NULL;
2159 static struct sigaction *chainedsigactions = NULL;
2160 static sema_t sig_sem;
2161 typedef int (*version_getting_t)();
2162 version_getting_t os::Solaris::get_libjsig_version = NULL;
2163
2164 int os::sigexitnum_pd() {
2165 assert(Sigexit > 0, "signal memory not yet initialized");
2166 return Sigexit;
2167 }
2168
2169 void os::Solaris::init_signal_mem() {
2170 // Initialize signal structures
2171 Maxsignum = SIGRTMAX;
2172 Sigexit = Maxsignum+1;
2173 assert(Maxsignum >0, "Unable to obtain max signal number");
2174
2175 // pending_signals has one int per signal
2176 // The additional signal is for SIGEXIT - exit signal to signal_thread
2177 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2178 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2179
2180 if (UseSignalChaining) {
2181 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2182 * (Maxsignum + 1), mtInternal);
2183 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2184 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2185 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2186 }
2187 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2188 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2189 }
2190
2191 void os::signal_init_pd() {
2192 int ret;
2193
2194 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2195 assert(ret == 0, "sema_init() failed");
2196 }
2197
2198 void os::signal_notify(int signal_number) {
2199 int ret;
2200
2201 Atomic::inc(&pending_signals[signal_number]);
2202 ret = ::sema_post(&sig_sem);
2203 assert(ret == 0, "sema_post() failed");
2204 }
2205
2206 static int check_pending_signals(bool wait_for_signal) {
2207 int ret;
2208 while (true) {
2209 for (int i = 0; i < Sigexit + 1; i++) {
2210 jint n = pending_signals[i];
2211 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2212 return i;
2213 }
2214 }
2215 if (!wait_for_signal) {
2216 return -1;
2217 }
2218 JavaThread *thread = JavaThread::current();
2219 ThreadBlockInVM tbivm(thread);
2220
2221 bool threadIsSuspended;
2222 do {
2223 thread->set_suspend_equivalent();
2224 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2225 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2226 ;
2227 assert(ret == 0, "sema_wait() failed");
2228
2229 // were we externally suspended while we were waiting?
2230 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2231 if (threadIsSuspended) {
2232 // The semaphore has been incremented, but while we were waiting
2233 // another thread suspended us. We don't want to continue running
2234 // while suspended because that would surprise the thread that
2235 // suspended us.
2236 ret = ::sema_post(&sig_sem);
2237 assert(ret == 0, "sema_post() failed");
2238
2239 thread->java_suspend_self();
2240 }
2241 } while (threadIsSuspended);
2242 }
2243 }
2244
2245 int os::signal_lookup() {
2246 return check_pending_signals(false);
2247 }
2248
2249 int os::signal_wait() {
2250 return check_pending_signals(true);
2251 }
2252
2253 ////////////////////////////////////////////////////////////////////////////////
2254 // Virtual Memory
2255
2256 static int page_size = -1;
2257
2258 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2259 // clear this var if support is not available.
2260 static bool has_map_align = true;
2261
2262 int os::vm_page_size() {
2263 assert(page_size != -1, "must call os::init");
2264 return page_size;
2265 }
2266
2267 // Solaris allocates memory by pages.
2268 int os::vm_allocation_granularity() {
2269 assert(page_size != -1, "must call os::init");
2270 return page_size;
2271 }
2272
2273 static bool recoverable_mmap_error(int err) {
2274 // See if the error is one we can let the caller handle. This
2275 // list of errno values comes from the Solaris mmap(2) man page.
2276 switch (err) {
2277 case EBADF:
2278 case EINVAL:
2279 case ENOTSUP:
2280 // let the caller deal with these errors
2281 return true;
2282
2283 default:
2284 // Any remaining errors on this OS can cause our reserved mapping
2285 // to be lost. That can cause confusion where different data
2286 // structures think they have the same memory mapped. The worst
2287 // scenario is if both the VM and a library think they have the
2288 // same memory mapped.
2289 return false;
2290 }
2291 }
2292
2293 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2294 int err) {
2295 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2296 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2297 os::strerror(err), err);
2298 }
2299
2300 static void warn_fail_commit_memory(char* addr, size_t bytes,
2301 size_t alignment_hint, bool exec,
2302 int err) {
2303 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2304 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2305 alignment_hint, exec, os::strerror(err), err);
2306 }
2307
2308 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2309 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2310 size_t size = bytes;
2311 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2312 if (res != NULL) {
2313 if (UseNUMAInterleaving) {
2314 numa_make_global(addr, bytes);
2315 }
2316 return 0;
2317 }
2318
2319 int err = errno; // save errno from mmap() call in mmap_chunk()
2320
2321 if (!recoverable_mmap_error(err)) {
2322 warn_fail_commit_memory(addr, bytes, exec, err);
2323 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2324 }
2325
2326 return err;
2327 }
2328
2329 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2330 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2331 }
2332
2333 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2334 const char* mesg) {
2335 assert(mesg != NULL, "mesg must be specified");
2336 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2337 if (err != 0) {
2338 // the caller wants all commit errors to exit with the specified mesg:
2339 warn_fail_commit_memory(addr, bytes, exec, err);
2340 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2341 }
2342 }
2343
2344 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2345 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2346 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2347 alignment, (size_t) vm_page_size());
2348
2349 for (int i = 0; _page_sizes[i] != 0; i++) {
2350 if (is_size_aligned(alignment, _page_sizes[i])) {
2351 return _page_sizes[i];
2352 }
2353 }
2354
2355 return (size_t) vm_page_size();
2356 }
2357
2358 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2359 size_t alignment_hint, bool exec) {
2360 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2361 if (err == 0 && UseLargePages && alignment_hint > 0) {
2362 assert(is_size_aligned(bytes, alignment_hint),
2363 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2364
2365 // The syscall memcntl requires an exact page size (see man memcntl for details).
2366 size_t page_size = page_size_for_alignment(alignment_hint);
2367 if (page_size > (size_t) vm_page_size()) {
2368 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2369 }
2370 }
2371 return err;
2372 }
2373
2374 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2375 bool exec) {
2376 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2377 }
2378
2379 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2380 size_t alignment_hint, bool exec,
2381 const char* mesg) {
2382 assert(mesg != NULL, "mesg must be specified");
2383 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2384 if (err != 0) {
2385 // the caller wants all commit errors to exit with the specified mesg:
2386 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2387 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2388 }
2389 }
2390
2391 // Uncommit the pages in a specified region.
2392 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2393 if (madvise(addr, bytes, MADV_FREE) < 0) {
2394 debug_only(warning("MADV_FREE failed."));
2395 return;
2396 }
2397 }
2398
2399 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2400 return os::commit_memory(addr, size, !ExecMem);
2401 }
2402
2403 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2404 return os::uncommit_memory(addr, size);
2405 }
2406
2407 // Change the page size in a given range.
2408 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2409 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2410 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2411 if (UseLargePages) {
2412 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2413 if (page_size > (size_t) vm_page_size()) {
2414 Solaris::setup_large_pages(addr, bytes, page_size);
2415 }
2416 }
2417 }
2418
2419 // Tell the OS to make the range local to the first-touching LWP
2420 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2421 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2422 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2423 debug_only(warning("MADV_ACCESS_LWP failed."));
2424 }
2425 }
2426
2427 // Tell the OS that this range would be accessed from different LWPs.
2428 void os::numa_make_global(char *addr, size_t bytes) {
2429 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2430 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2431 debug_only(warning("MADV_ACCESS_MANY failed."));
2432 }
2433 }
2434
2435 // Get the number of the locality groups.
2436 size_t os::numa_get_groups_num() {
2437 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2438 return n != -1 ? n : 1;
2439 }
2440
2441 // Get a list of leaf locality groups. A leaf lgroup is group that
2442 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2443 // board. An LWP is assigned to one of these groups upon creation.
2444 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2445 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2446 ids[0] = 0;
2447 return 1;
2448 }
2449 int result_size = 0, top = 1, bottom = 0, cur = 0;
2450 for (int k = 0; k < size; k++) {
2451 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2452 (Solaris::lgrp_id_t*)&ids[top], size - top);
2453 if (r == -1) {
2454 ids[0] = 0;
2455 return 1;
2456 }
2457 if (!r) {
2458 // That's a leaf node.
2459 assert(bottom <= cur, "Sanity check");
2460 // Check if the node has memory
2461 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2462 NULL, 0, LGRP_RSRC_MEM) > 0) {
2463 ids[bottom++] = ids[cur];
2464 }
2465 }
2466 top += r;
2467 cur++;
2468 }
2469 if (bottom == 0) {
2470 // Handle a situation, when the OS reports no memory available.
2471 // Assume UMA architecture.
2472 ids[0] = 0;
2473 return 1;
2474 }
2475 return bottom;
2476 }
2477
2478 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2479 bool os::numa_topology_changed() {
2480 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2481 if (is_stale != -1 && is_stale) {
2482 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2483 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2484 assert(c != 0, "Failure to initialize LGRP API");
2485 Solaris::set_lgrp_cookie(c);
2486 return true;
2487 }
2488 return false;
2489 }
2490
2491 // Get the group id of the current LWP.
2492 int os::numa_get_group_id() {
2493 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2494 if (lgrp_id == -1) {
2495 return 0;
2496 }
2497 const int size = os::numa_get_groups_num();
2498 int *ids = (int*)alloca(size * sizeof(int));
2499
2500 // Get the ids of all lgroups with memory; r is the count.
2501 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2502 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2503 if (r <= 0) {
2504 return 0;
2505 }
2506 return ids[os::random() % r];
2507 }
2508
2509 // Request information about the page.
2510 bool os::get_page_info(char *start, page_info* info) {
2511 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2512 uint64_t addr = (uintptr_t)start;
2513 uint64_t outdata[2];
2514 uint_t validity = 0;
2515
2516 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2517 return false;
2518 }
2519
2520 info->size = 0;
2521 info->lgrp_id = -1;
2522
2523 if ((validity & 1) != 0) {
2524 if ((validity & 2) != 0) {
2525 info->lgrp_id = outdata[0];
2526 }
2527 if ((validity & 4) != 0) {
2528 info->size = outdata[1];
2529 }
2530 return true;
2531 }
2532 return false;
2533 }
2534
2535 // Scan the pages from start to end until a page different than
2536 // the one described in the info parameter is encountered.
2537 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2538 page_info* page_found) {
2539 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2540 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2541 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2542 uint_t validity[MAX_MEMINFO_CNT];
2543
2544 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2545 uint64_t p = (uint64_t)start;
2546 while (p < (uint64_t)end) {
2547 addrs[0] = p;
2548 size_t addrs_count = 1;
2549 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2550 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2551 addrs_count++;
2552 }
2553
2554 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2555 return NULL;
2556 }
2557
2558 size_t i = 0;
2559 for (; i < addrs_count; i++) {
2560 if ((validity[i] & 1) != 0) {
2561 if ((validity[i] & 4) != 0) {
2562 if (outdata[types * i + 1] != page_expected->size) {
2563 break;
2564 }
2565 } else if (page_expected->size != 0) {
2566 break;
2567 }
2568
2569 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2570 if (outdata[types * i] != page_expected->lgrp_id) {
2571 break;
2572 }
2573 }
2574 } else {
2575 return NULL;
2576 }
2577 }
2578
2579 if (i < addrs_count) {
2580 if ((validity[i] & 2) != 0) {
2581 page_found->lgrp_id = outdata[types * i];
2582 } else {
2583 page_found->lgrp_id = -1;
2584 }
2585 if ((validity[i] & 4) != 0) {
2586 page_found->size = outdata[types * i + 1];
2587 } else {
2588 page_found->size = 0;
2589 }
2590 return (char*)addrs[i];
2591 }
2592
2593 p = addrs[addrs_count - 1] + page_size;
2594 }
2595 return end;
2596 }
2597
2598 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2599 size_t size = bytes;
2600 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2601 // uncommitted page. Otherwise, the read/write might succeed if we
2602 // have enough swap space to back the physical page.
2603 return
2604 NULL != Solaris::mmap_chunk(addr, size,
2605 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2606 PROT_NONE);
2607 }
2608
2609 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2610 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2611
2612 if (b == MAP_FAILED) {
2613 return NULL;
2614 }
2615 return b;
2616 }
2617
2618 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2619 size_t alignment_hint, bool fixed) {
2620 char* addr = requested_addr;
2621 int flags = MAP_PRIVATE | MAP_NORESERVE;
2622
2623 assert(!(fixed && (alignment_hint > 0)),
2624 "alignment hint meaningless with fixed mmap");
2625
2626 if (fixed) {
2627 flags |= MAP_FIXED;
2628 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2629 flags |= MAP_ALIGN;
2630 addr = (char*) alignment_hint;
2631 }
2632
2633 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2634 // uncommitted page. Otherwise, the read/write might succeed if we
2635 // have enough swap space to back the physical page.
2636 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2637 }
2638
2639 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2640 size_t alignment_hint) {
2641 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2642 (requested_addr != NULL));
2643
2644 guarantee(requested_addr == NULL || requested_addr == addr,
2645 "OS failed to return requested mmap address.");
2646 return addr;
2647 }
2648
2649 // Reserve memory at an arbitrary address, only if that area is
2650 // available (and not reserved for something else).
2651
2652 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2653 const int max_tries = 10;
2654 char* base[max_tries];
2655 size_t size[max_tries];
2656
2657 // Solaris adds a gap between mmap'ed regions. The size of the gap
2658 // is dependent on the requested size and the MMU. Our initial gap
2659 // value here is just a guess and will be corrected later.
2660 bool had_top_overlap = false;
2661 bool have_adjusted_gap = false;
2662 size_t gap = 0x400000;
2663
2664 // Assert only that the size is a multiple of the page size, since
2665 // that's all that mmap requires, and since that's all we really know
2666 // about at this low abstraction level. If we need higher alignment,
2667 // we can either pass an alignment to this method or verify alignment
2668 // in one of the methods further up the call chain. See bug 5044738.
2669 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2670
2671 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2672 // Give it a try, if the kernel honors the hint we can return immediately.
2673 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2674
2675 volatile int err = errno;
2676 if (addr == requested_addr) {
2677 return addr;
2678 } else if (addr != NULL) {
2679 pd_unmap_memory(addr, bytes);
2680 }
2681
2682 if (log_is_enabled(Warning, os)) {
2683 char buf[256];
2684 buf[0] = '\0';
2685 if (addr == NULL) {
2686 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2687 }
2688 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2689 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2690 "%s", bytes, requested_addr, addr, buf);
2691 }
2692
2693 // Address hint method didn't work. Fall back to the old method.
2694 // In theory, once SNV becomes our oldest supported platform, this
2695 // code will no longer be needed.
2696 //
2697 // Repeatedly allocate blocks until the block is allocated at the
2698 // right spot. Give up after max_tries.
2699 int i;
2700 for (i = 0; i < max_tries; ++i) {
2701 base[i] = reserve_memory(bytes);
2702
2703 if (base[i] != NULL) {
2704 // Is this the block we wanted?
2705 if (base[i] == requested_addr) {
2706 size[i] = bytes;
2707 break;
2708 }
2709
2710 // check that the gap value is right
2711 if (had_top_overlap && !have_adjusted_gap) {
2712 size_t actual_gap = base[i-1] - base[i] - bytes;
2713 if (gap != actual_gap) {
2714 // adjust the gap value and retry the last 2 allocations
2715 assert(i > 0, "gap adjustment code problem");
2716 have_adjusted_gap = true; // adjust the gap only once, just in case
2717 gap = actual_gap;
2718 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2719 unmap_memory(base[i], bytes);
2720 unmap_memory(base[i-1], size[i-1]);
2721 i-=2;
2722 continue;
2723 }
2724 }
2725
2726 // Does this overlap the block we wanted? Give back the overlapped
2727 // parts and try again.
2728 //
2729 // There is still a bug in this code: if top_overlap == bytes,
2730 // the overlap is offset from requested region by the value of gap.
2731 // In this case giving back the overlapped part will not work,
2732 // because we'll give back the entire block at base[i] and
2733 // therefore the subsequent allocation will not generate a new gap.
2734 // This could be fixed with a new algorithm that used larger
2735 // or variable size chunks to find the requested region -
2736 // but such a change would introduce additional complications.
2737 // It's rare enough that the planets align for this bug,
2738 // so we'll just wait for a fix for 6204603/5003415 which
2739 // will provide a mmap flag to allow us to avoid this business.
2740
2741 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2742 if (top_overlap >= 0 && top_overlap < bytes) {
2743 had_top_overlap = true;
2744 unmap_memory(base[i], top_overlap);
2745 base[i] += top_overlap;
2746 size[i] = bytes - top_overlap;
2747 } else {
2748 size_t bottom_overlap = base[i] + bytes - requested_addr;
2749 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2750 if (bottom_overlap == 0) {
2751 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2752 }
2753 unmap_memory(requested_addr, bottom_overlap);
2754 size[i] = bytes - bottom_overlap;
2755 } else {
2756 size[i] = bytes;
2757 }
2758 }
2759 }
2760 }
2761
2762 // Give back the unused reserved pieces.
2763
2764 for (int j = 0; j < i; ++j) {
2765 if (base[j] != NULL) {
2766 unmap_memory(base[j], size[j]);
2767 }
2768 }
2769
2770 return (i < max_tries) ? requested_addr : NULL;
2771 }
2772
2773 bool os::pd_release_memory(char* addr, size_t bytes) {
2774 size_t size = bytes;
2775 return munmap(addr, size) == 0;
2776 }
2777
2778 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2779 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2780 "addr must be page aligned");
2781 int retVal = mprotect(addr, bytes, prot);
2782 return retVal == 0;
2783 }
2784
2785 // Protect memory (Used to pass readonly pages through
2786 // JNI GetArray<type>Elements with empty arrays.)
2787 // Also, used for serialization page and for compressed oops null pointer
2788 // checking.
2789 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2790 bool is_committed) {
2791 unsigned int p = 0;
2792 switch (prot) {
2793 case MEM_PROT_NONE: p = PROT_NONE; break;
2794 case MEM_PROT_READ: p = PROT_READ; break;
2795 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2796 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2797 default:
2798 ShouldNotReachHere();
2799 }
2800 // is_committed is unused.
2801 return solaris_mprotect(addr, bytes, p);
2802 }
2803
2804 // guard_memory and unguard_memory only happens within stack guard pages.
2805 // Since ISM pertains only to the heap, guard and unguard memory should not
2806 /// happen with an ISM region.
2807 bool os::guard_memory(char* addr, size_t bytes) {
2808 return solaris_mprotect(addr, bytes, PROT_NONE);
2809 }
2810
2811 bool os::unguard_memory(char* addr, size_t bytes) {
2812 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2813 }
2814
2815 // Large page support
2816 static size_t _large_page_size = 0;
2817
2818 // Insertion sort for small arrays (descending order).
2819 static void insertion_sort_descending(size_t* array, int len) {
2820 for (int i = 0; i < len; i++) {
2821 size_t val = array[i];
2822 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2823 size_t tmp = array[key];
2824 array[key] = array[key - 1];
2825 array[key - 1] = tmp;
2826 }
2827 }
2828 }
2829
2830 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2831 const unsigned int usable_count = VM_Version::page_size_count();
2832 if (usable_count == 1) {
2833 return false;
2834 }
2835
2836 // Find the right getpagesizes interface. When solaris 11 is the minimum
2837 // build platform, getpagesizes() (without the '2') can be called directly.
2838 typedef int (*gps_t)(size_t[], int);
2839 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2840 if (gps_func == NULL) {
2841 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2842 if (gps_func == NULL) {
2843 if (warn) {
2844 warning("MPSS is not supported by the operating system.");
2845 }
2846 return false;
2847 }
2848 }
2849
2850 // Fill the array of page sizes.
2851 int n = (*gps_func)(_page_sizes, page_sizes_max);
2852 assert(n > 0, "Solaris bug?");
2853
2854 if (n == page_sizes_max) {
2855 // Add a sentinel value (necessary only if the array was completely filled
2856 // since it is static (zeroed at initialization)).
2857 _page_sizes[--n] = 0;
2858 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2859 }
2860 assert(_page_sizes[n] == 0, "missing sentinel");
2861 trace_page_sizes("available page sizes", _page_sizes, n);
2862
2863 if (n == 1) return false; // Only one page size available.
2864
2865 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2866 // select up to usable_count elements. First sort the array, find the first
2867 // acceptable value, then copy the usable sizes to the top of the array and
2868 // trim the rest. Make sure to include the default page size :-).
2869 //
2870 // A better policy could get rid of the 4M limit by taking the sizes of the
2871 // important VM memory regions (java heap and possibly the code cache) into
2872 // account.
2873 insertion_sort_descending(_page_sizes, n);
2874 const size_t size_limit =
2875 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2876 int beg;
2877 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2878 const int end = MIN2((int)usable_count, n) - 1;
2879 for (int cur = 0; cur < end; ++cur, ++beg) {
2880 _page_sizes[cur] = _page_sizes[beg];
2881 }
2882 _page_sizes[end] = vm_page_size();
2883 _page_sizes[end + 1] = 0;
2884
2885 if (_page_sizes[end] > _page_sizes[end - 1]) {
2886 // Default page size is not the smallest; sort again.
2887 insertion_sort_descending(_page_sizes, end + 1);
2888 }
2889 *page_size = _page_sizes[0];
2890
2891 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2892 return true;
2893 }
2894
2895 void os::large_page_init() {
2896 if (UseLargePages) {
2897 // print a warning if any large page related flag is specified on command line
2898 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2899 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2900
2901 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2902 }
2903 }
2904
2905 bool os::Solaris::is_valid_page_size(size_t bytes) {
2906 for (int i = 0; _page_sizes[i] != 0; i++) {
2907 if (_page_sizes[i] == bytes) {
2908 return true;
2909 }
2910 }
2911 return false;
2912 }
2913
2914 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2915 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2916 assert(is_ptr_aligned((void*) start, align),
2917 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2918 assert(is_size_aligned(bytes, align),
2919 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2920
2921 // Signal to OS that we want large pages for addresses
2922 // from addr, addr + bytes
2923 struct memcntl_mha mpss_struct;
2924 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2925 mpss_struct.mha_pagesize = align;
2926 mpss_struct.mha_flags = 0;
2927 // Upon successful completion, memcntl() returns 0
2928 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2929 debug_only(warning("Attempt to use MPSS failed."));
2930 return false;
2931 }
2932 return true;
2933 }
2934
2935 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2936 fatal("os::reserve_memory_special should not be called on Solaris.");
2937 return NULL;
2938 }
2939
2940 bool os::release_memory_special(char* base, size_t bytes) {
2941 fatal("os::release_memory_special should not be called on Solaris.");
2942 return false;
2943 }
2944
2945 size_t os::large_page_size() {
2946 return _large_page_size;
2947 }
2948
2949 // MPSS allows application to commit large page memory on demand; with ISM
2950 // the entire memory region must be allocated as shared memory.
2951 bool os::can_commit_large_page_memory() {
2952 return true;
2953 }
2954
2955 bool os::can_execute_large_page_memory() {
2956 return true;
2957 }
2958
2959 // Read calls from inside the vm need to perform state transitions
2960 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2961 size_t res;
2962 JavaThread* thread = (JavaThread*)Thread::current();
2963 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2964 ThreadBlockInVM tbiv(thread);
2965 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2966 return res;
2967 }
2968
2969 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2970 size_t res;
2971 JavaThread* thread = (JavaThread*)Thread::current();
2972 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2973 ThreadBlockInVM tbiv(thread);
2974 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
2975 return res;
2976 }
2977
2978 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
2979 size_t res;
2980 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
2981 "Assumed _thread_in_native");
2982 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2983 return res;
2984 }
2985
2986 void os::naked_short_sleep(jlong ms) {
2987 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2988
2989 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
2990 // Solaris requires -lrt for this.
2991 usleep((ms * 1000));
2992
2993 return;
2994 }
2995
2996 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2997 void os::infinite_sleep() {
2998 while (true) { // sleep forever ...
2999 ::sleep(100); // ... 100 seconds at a time
3000 }
3001 }
3002
3003 // Used to convert frequent JVM_Yield() to nops
3004 bool os::dont_yield() {
3005 if (DontYieldALot) {
3006 static hrtime_t last_time = 0;
3007 hrtime_t diff = getTimeNanos() - last_time;
3008
3009 if (diff < DontYieldALotInterval * 1000000) {
3010 return true;
3011 }
3012
3013 last_time += diff;
3014
3015 return false;
3016 } else {
3017 return false;
3018 }
3019 }
3020
3021 // Note that yield semantics are defined by the scheduling class to which
3022 // the thread currently belongs. Typically, yield will _not yield to
3023 // other equal or higher priority threads that reside on the dispatch queues
3024 // of other CPUs.
3025
3026 void os::naked_yield() {
3027 thr_yield();
3028 }
3029
3030 // Interface for setting lwp priorities. We are using T2 libthread,
3031 // which forces the use of bound threads, so all of our threads will
3032 // be assigned to real lwp's. Using the thr_setprio function is
3033 // meaningless in this mode so we must adjust the real lwp's priority.
3034 // The routines below implement the getting and setting of lwp priorities.
3035 //
3036 // Note: There are three priority scales used on Solaris. Java priotities
3037 // which range from 1 to 10, libthread "thr_setprio" scale which range
3038 // from 0 to 127, and the current scheduling class of the process we
3039 // are running in. This is typically from -60 to +60.
3040 // The setting of the lwp priorities in done after a call to thr_setprio
3041 // so Java priorities are mapped to libthread priorities and we map from
3042 // the latter to lwp priorities. We don't keep priorities stored in
3043 // Java priorities since some of our worker threads want to set priorities
3044 // higher than all Java threads.
3045 //
3046 // For related information:
3047 // (1) man -s 2 priocntl
3048 // (2) man -s 4 priocntl
3049 // (3) man dispadmin
3050 // = librt.so
3051 // = libthread/common/rtsched.c - thrp_setlwpprio().
3052 // = ps -cL <pid> ... to validate priority.
3053 // = sched_get_priority_min and _max
3054 // pthread_create
3055 // sched_setparam
3056 // pthread_setschedparam
3057 //
3058 // Assumptions:
3059 // + We assume that all threads in the process belong to the same
3060 // scheduling class. IE. an homogenous process.
3061 // + Must be root or in IA group to change change "interactive" attribute.
3062 // Priocntl() will fail silently. The only indication of failure is when
3063 // we read-back the value and notice that it hasn't changed.
3064 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3065 // + For RT, change timeslice as well. Invariant:
3066 // constant "priority integral"
3067 // Konst == TimeSlice * (60-Priority)
3068 // Given a priority, compute appropriate timeslice.
3069 // + Higher numerical values have higher priority.
3070
3071 // sched class attributes
3072 typedef struct {
3073 int schedPolicy; // classID
3074 int maxPrio;
3075 int minPrio;
3076 } SchedInfo;
3077
3078
3079 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3080
3081 #ifdef ASSERT
3082 static int ReadBackValidate = 1;
3083 #endif
3084 static int myClass = 0;
3085 static int myMin = 0;
3086 static int myMax = 0;
3087 static int myCur = 0;
3088 static bool priocntl_enable = false;
3089
3090 static const int criticalPrio = FXCriticalPriority;
3091 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3092
3093
3094 // lwp_priocntl_init
3095 //
3096 // Try to determine the priority scale for our process.
3097 //
3098 // Return errno or 0 if OK.
3099 //
3100 static int lwp_priocntl_init() {
3101 int rslt;
3102 pcinfo_t ClassInfo;
3103 pcparms_t ParmInfo;
3104 int i;
3105
3106 if (!UseThreadPriorities) return 0;
3107
3108 // If ThreadPriorityPolicy is 1, switch tables
3109 if (ThreadPriorityPolicy == 1) {
3110 for (i = 0; i < CriticalPriority+1; i++)
3111 os::java_to_os_priority[i] = prio_policy1[i];
3112 }
3113 if (UseCriticalJavaThreadPriority) {
3114 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3115 // See set_native_priority() and set_lwp_class_and_priority().
3116 // Save original MaxPriority mapping in case attempt to
3117 // use critical priority fails.
3118 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3119 // Set negative to distinguish from other priorities
3120 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3121 }
3122
3123 // Get IDs for a set of well-known scheduling classes.
3124 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3125 // the system. We should have a loop that iterates over the
3126 // classID values, which are known to be "small" integers.
3127
3128 strcpy(ClassInfo.pc_clname, "TS");
3129 ClassInfo.pc_cid = -1;
3130 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3131 if (rslt < 0) return errno;
3132 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3133 tsLimits.schedPolicy = ClassInfo.pc_cid;
3134 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3135 tsLimits.minPrio = -tsLimits.maxPrio;
3136
3137 strcpy(ClassInfo.pc_clname, "IA");
3138 ClassInfo.pc_cid = -1;
3139 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3140 if (rslt < 0) return errno;
3141 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3142 iaLimits.schedPolicy = ClassInfo.pc_cid;
3143 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3144 iaLimits.minPrio = -iaLimits.maxPrio;
3145
3146 strcpy(ClassInfo.pc_clname, "RT");
3147 ClassInfo.pc_cid = -1;
3148 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3149 if (rslt < 0) return errno;
3150 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3151 rtLimits.schedPolicy = ClassInfo.pc_cid;
3152 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3153 rtLimits.minPrio = 0;
3154
3155 strcpy(ClassInfo.pc_clname, "FX");
3156 ClassInfo.pc_cid = -1;
3157 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3158 if (rslt < 0) return errno;
3159 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3160 fxLimits.schedPolicy = ClassInfo.pc_cid;
3161 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3162 fxLimits.minPrio = 0;
3163
3164 // Query our "current" scheduling class.
3165 // This will normally be IA, TS or, rarely, FX or RT.
3166 memset(&ParmInfo, 0, sizeof(ParmInfo));
3167 ParmInfo.pc_cid = PC_CLNULL;
3168 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3169 if (rslt < 0) return errno;
3170 myClass = ParmInfo.pc_cid;
3171
3172 // We now know our scheduling classId, get specific information
3173 // about the class.
3174 ClassInfo.pc_cid = myClass;
3175 ClassInfo.pc_clname[0] = 0;
3176 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3177 if (rslt < 0) return errno;
3178
3179 if (ThreadPriorityVerbose) {
3180 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3181 }
3182
3183 memset(&ParmInfo, 0, sizeof(pcparms_t));
3184 ParmInfo.pc_cid = PC_CLNULL;
3185 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3186 if (rslt < 0) return errno;
3187
3188 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3189 myMin = rtLimits.minPrio;
3190 myMax = rtLimits.maxPrio;
3191 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3192 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3193 myMin = iaLimits.minPrio;
3194 myMax = iaLimits.maxPrio;
3195 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3196 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3197 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3198 myMin = tsLimits.minPrio;
3199 myMax = tsLimits.maxPrio;
3200 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3201 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3202 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3203 myMin = fxLimits.minPrio;
3204 myMax = fxLimits.maxPrio;
3205 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3206 } else {
3207 // No clue - punt
3208 if (ThreadPriorityVerbose) {
3209 tty->print_cr("Unknown scheduling class: %s ... \n",
3210 ClassInfo.pc_clname);
3211 }
3212 return EINVAL; // no clue, punt
3213 }
3214
3215 if (ThreadPriorityVerbose) {
3216 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3217 }
3218
3219 priocntl_enable = true; // Enable changing priorities
3220 return 0;
3221 }
3222
3223 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3224 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3225 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3226 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3227
3228
3229 // scale_to_lwp_priority
3230 //
3231 // Convert from the libthread "thr_setprio" scale to our current
3232 // lwp scheduling class scale.
3233 //
3234 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3235 int v;
3236
3237 if (x == 127) return rMax; // avoid round-down
3238 v = (((x*(rMax-rMin)))/128)+rMin;
3239 return v;
3240 }
3241
3242
3243 // set_lwp_class_and_priority
3244 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3245 int newPrio, int new_class, bool scale) {
3246 int rslt;
3247 int Actual, Expected, prv;
3248 pcparms_t ParmInfo; // for GET-SET
3249 #ifdef ASSERT
3250 pcparms_t ReadBack; // for readback
3251 #endif
3252
3253 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3254 // Query current values.
3255 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3256 // Cache "pcparms_t" in global ParmCache.
3257 // TODO: elide set-to-same-value
3258
3259 // If something went wrong on init, don't change priorities.
3260 if (!priocntl_enable) {
3261 if (ThreadPriorityVerbose) {
3262 tty->print_cr("Trying to set priority but init failed, ignoring");
3263 }
3264 return EINVAL;
3265 }
3266
3267 // If lwp hasn't started yet, just return
3268 // the _start routine will call us again.
3269 if (lwpid <= 0) {
3270 if (ThreadPriorityVerbose) {
3271 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3272 INTPTR_FORMAT " to %d, lwpid not set",
3273 ThreadID, newPrio);
3274 }
3275 return 0;
3276 }
3277
3278 if (ThreadPriorityVerbose) {
3279 tty->print_cr ("set_lwp_class_and_priority("
3280 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3281 ThreadID, lwpid, newPrio);
3282 }
3283
3284 memset(&ParmInfo, 0, sizeof(pcparms_t));
3285 ParmInfo.pc_cid = PC_CLNULL;
3286 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3287 if (rslt < 0) return errno;
3288
3289 int cur_class = ParmInfo.pc_cid;
3290 ParmInfo.pc_cid = (id_t)new_class;
3291
3292 if (new_class == rtLimits.schedPolicy) {
3293 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3294 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3295 rtLimits.maxPrio, newPrio)
3296 : newPrio;
3297 rtInfo->rt_tqsecs = RT_NOCHANGE;
3298 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3299 if (ThreadPriorityVerbose) {
3300 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3301 }
3302 } else if (new_class == iaLimits.schedPolicy) {
3303 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3304 int maxClamped = MIN2(iaLimits.maxPrio,
3305 cur_class == new_class
3306 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3307 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3308 maxClamped, newPrio)
3309 : newPrio;
3310 iaInfo->ia_uprilim = cur_class == new_class
3311 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3312 iaInfo->ia_mode = IA_NOCHANGE;
3313 if (ThreadPriorityVerbose) {
3314 tty->print_cr("IA: [%d...%d] %d->%d\n",
3315 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3316 }
3317 } else if (new_class == tsLimits.schedPolicy) {
3318 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3319 int maxClamped = MIN2(tsLimits.maxPrio,
3320 cur_class == new_class
3321 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3322 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3323 maxClamped, newPrio)
3324 : newPrio;
3325 tsInfo->ts_uprilim = cur_class == new_class
3326 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3327 if (ThreadPriorityVerbose) {
3328 tty->print_cr("TS: [%d...%d] %d->%d\n",
3329 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3330 }
3331 } else if (new_class == fxLimits.schedPolicy) {
3332 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3333 int maxClamped = MIN2(fxLimits.maxPrio,
3334 cur_class == new_class
3335 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3336 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3337 maxClamped, newPrio)
3338 : newPrio;
3339 fxInfo->fx_uprilim = cur_class == new_class
3340 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3341 fxInfo->fx_tqsecs = FX_NOCHANGE;
3342 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3343 if (ThreadPriorityVerbose) {
3344 tty->print_cr("FX: [%d...%d] %d->%d\n",
3345 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3346 }
3347 } else {
3348 if (ThreadPriorityVerbose) {
3349 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3350 }
3351 return EINVAL; // no clue, punt
3352 }
3353
3354 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3355 if (ThreadPriorityVerbose && rslt) {
3356 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3357 }
3358 if (rslt < 0) return errno;
3359
3360 #ifdef ASSERT
3361 // Sanity check: read back what we just attempted to set.
3362 // In theory it could have changed in the interim ...
3363 //
3364 // The priocntl system call is tricky.
3365 // Sometimes it'll validate the priority value argument and
3366 // return EINVAL if unhappy. At other times it fails silently.
3367 // Readbacks are prudent.
3368
3369 if (!ReadBackValidate) return 0;
3370
3371 memset(&ReadBack, 0, sizeof(pcparms_t));
3372 ReadBack.pc_cid = PC_CLNULL;
3373 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3374 assert(rslt >= 0, "priocntl failed");
3375 Actual = Expected = 0xBAD;
3376 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3377 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3378 Actual = RTPRI(ReadBack)->rt_pri;
3379 Expected = RTPRI(ParmInfo)->rt_pri;
3380 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3381 Actual = IAPRI(ReadBack)->ia_upri;
3382 Expected = IAPRI(ParmInfo)->ia_upri;
3383 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3384 Actual = TSPRI(ReadBack)->ts_upri;
3385 Expected = TSPRI(ParmInfo)->ts_upri;
3386 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3387 Actual = FXPRI(ReadBack)->fx_upri;
3388 Expected = FXPRI(ParmInfo)->fx_upri;
3389 } else {
3390 if (ThreadPriorityVerbose) {
3391 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3392 ParmInfo.pc_cid);
3393 }
3394 }
3395
3396 if (Actual != Expected) {
3397 if (ThreadPriorityVerbose) {
3398 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3399 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3400 }
3401 }
3402 #endif
3403
3404 return 0;
3405 }
3406
3407 // Solaris only gives access to 128 real priorities at a time,
3408 // so we expand Java's ten to fill this range. This would be better
3409 // if we dynamically adjusted relative priorities.
3410 //
3411 // The ThreadPriorityPolicy option allows us to select 2 different
3412 // priority scales.
3413 //
3414 // ThreadPriorityPolicy=0
3415 // Since the Solaris' default priority is MaximumPriority, we do not
3416 // set a priority lower than Max unless a priority lower than
3417 // NormPriority is requested.
3418 //
3419 // ThreadPriorityPolicy=1
3420 // This mode causes the priority table to get filled with
3421 // linear values. NormPriority get's mapped to 50% of the
3422 // Maximum priority an so on. This will cause VM threads
3423 // to get unfair treatment against other Solaris processes
3424 // which do not explicitly alter their thread priorities.
3425
3426 int os::java_to_os_priority[CriticalPriority + 1] = {
3427 -99999, // 0 Entry should never be used
3428
3429 0, // 1 MinPriority
3430 32, // 2
3431 64, // 3
3432
3433 96, // 4
3434 127, // 5 NormPriority
3435 127, // 6
3436
3437 127, // 7
3438 127, // 8
3439 127, // 9 NearMaxPriority
3440
3441 127, // 10 MaxPriority
3442
3443 -criticalPrio // 11 CriticalPriority
3444 };
3445
3446 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3447 OSThread* osthread = thread->osthread();
3448
3449 // Save requested priority in case the thread hasn't been started
3450 osthread->set_native_priority(newpri);
3451
3452 // Check for critical priority request
3453 bool fxcritical = false;
3454 if (newpri == -criticalPrio) {
3455 fxcritical = true;
3456 newpri = criticalPrio;
3457 }
3458
3459 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3460 if (!UseThreadPriorities) return OS_OK;
3461
3462 int status = 0;
3463
3464 if (!fxcritical) {
3465 // Use thr_setprio only if we have a priority that thr_setprio understands
3466 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3467 }
3468
3469 int lwp_status =
3470 set_lwp_class_and_priority(osthread->thread_id(),
3471 osthread->lwp_id(),
3472 newpri,
3473 fxcritical ? fxLimits.schedPolicy : myClass,
3474 !fxcritical);
3475 if (lwp_status != 0 && fxcritical) {
3476 // Try again, this time without changing the scheduling class
3477 newpri = java_MaxPriority_to_os_priority;
3478 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3479 osthread->lwp_id(),
3480 newpri, myClass, false);
3481 }
3482 status |= lwp_status;
3483 return (status == 0) ? OS_OK : OS_ERR;
3484 }
3485
3486
3487 OSReturn os::get_native_priority(const Thread* const thread,
3488 int *priority_ptr) {
3489 int p;
3490 if (!UseThreadPriorities) {
3491 *priority_ptr = NormalPriority;
3492 return OS_OK;
3493 }
3494 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3495 if (status != 0) {
3496 return OS_ERR;
3497 }
3498 *priority_ptr = p;
3499 return OS_OK;
3500 }
3501
3502
3503 // Hint to the underlying OS that a task switch would not be good.
3504 // Void return because it's a hint and can fail.
3505 void os::hint_no_preempt() {
3506 schedctl_start(schedctl_init());
3507 }
3508
3509 static void resume_clear_context(OSThread *osthread) {
3510 osthread->set_ucontext(NULL);
3511 }
3512
3513 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3514 osthread->set_ucontext(context);
3515 }
3516
3517 static PosixSemaphore sr_semaphore;
3518
3519 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3520 // Save and restore errno to avoid confusing native code with EINTR
3521 // after sigsuspend.
3522 int old_errno = errno;
3523
3524 OSThread* osthread = thread->osthread();
3525 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3526
3527 os::SuspendResume::State current = osthread->sr.state();
3528 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3529 suspend_save_context(osthread, uc);
3530
3531 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3532 os::SuspendResume::State state = osthread->sr.suspended();
3533 if (state == os::SuspendResume::SR_SUSPENDED) {
3534 sigset_t suspend_set; // signals for sigsuspend()
3535
3536 // get current set of blocked signals and unblock resume signal
3537 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3538 sigdelset(&suspend_set, ASYNC_SIGNAL);
3539
3540 sr_semaphore.signal();
3541 // wait here until we are resumed
3542 while (1) {
3543 sigsuspend(&suspend_set);
3544
3545 os::SuspendResume::State result = osthread->sr.running();
3546 if (result == os::SuspendResume::SR_RUNNING) {
3547 sr_semaphore.signal();
3548 break;
3549 }
3550 }
3551
3552 } else if (state == os::SuspendResume::SR_RUNNING) {
3553 // request was cancelled, continue
3554 } else {
3555 ShouldNotReachHere();
3556 }
3557
3558 resume_clear_context(osthread);
3559 } else if (current == os::SuspendResume::SR_RUNNING) {
3560 // request was cancelled, continue
3561 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3562 // ignore
3563 } else {
3564 // ignore
3565 }
3566
3567 errno = old_errno;
3568 }
3569
3570 void os::print_statistics() {
3571 }
3572
3573 bool os::message_box(const char* title, const char* message) {
3574 int i;
3575 fdStream err(defaultStream::error_fd());
3576 for (i = 0; i < 78; i++) err.print_raw("=");
3577 err.cr();
3578 err.print_raw_cr(title);
3579 for (i = 0; i < 78; i++) err.print_raw("-");
3580 err.cr();
3581 err.print_raw_cr(message);
3582 for (i = 0; i < 78; i++) err.print_raw("=");
3583 err.cr();
3584
3585 char buf[16];
3586 // Prevent process from exiting upon "read error" without consuming all CPU
3587 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3588
3589 return buf[0] == 'y' || buf[0] == 'Y';
3590 }
3591
3592 static int sr_notify(OSThread* osthread) {
3593 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL);
3594 assert_status(status == 0, status, "thr_kill");
3595 return status;
3596 }
3597
3598 // "Randomly" selected value for how long we want to spin
3599 // before bailing out on suspending a thread, also how often
3600 // we send a signal to a thread we want to resume
3601 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3602 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3603
3604 static bool do_suspend(OSThread* osthread) {
3605 assert(osthread->sr.is_running(), "thread should be running");
3606 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3607
3608 // mark as suspended and send signal
3609 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3610 // failed to switch, state wasn't running?
3611 ShouldNotReachHere();
3612 return false;
3613 }
3614
3615 if (sr_notify(osthread) != 0) {
3616 ShouldNotReachHere();
3617 }
3618
3619 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3620 while (true) {
3621 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3622 break;
3623 } else {
3624 // timeout
3625 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3626 if (cancelled == os::SuspendResume::SR_RUNNING) {
3627 return false;
3628 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3629 // make sure that we consume the signal on the semaphore as well
3630 sr_semaphore.wait();
3631 break;
3632 } else {
3633 ShouldNotReachHere();
3634 return false;
3635 }
3636 }
3637 }
3638
3639 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3640 return true;
3641 }
3642
3643 static void do_resume(OSThread* osthread) {
3644 assert(osthread->sr.is_suspended(), "thread should be suspended");
3645 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3646
3647 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3648 // failed to switch to WAKEUP_REQUEST
3649 ShouldNotReachHere();
3650 return;
3651 }
3652
3653 while (true) {
3654 if (sr_notify(osthread) == 0) {
3655 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3656 if (osthread->sr.is_running()) {
3657 return;
3658 }
3659 }
3660 } else {
3661 ShouldNotReachHere();
3662 }
3663 }
3664
3665 guarantee(osthread->sr.is_running(), "Must be running!");
3666 }
3667
3668 void os::SuspendedThreadTask::internal_do_task() {
3669 if (do_suspend(_thread->osthread())) {
3670 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3671 do_task(context);
3672 do_resume(_thread->osthread());
3673 }
3674 }
3675
3676 class PcFetcher : public os::SuspendedThreadTask {
3677 public:
3678 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3679 ExtendedPC result();
3680 protected:
3681 void do_task(const os::SuspendedThreadTaskContext& context);
3682 private:
3683 ExtendedPC _epc;
3684 };
3685
3686 ExtendedPC PcFetcher::result() {
3687 guarantee(is_done(), "task is not done yet.");
3688 return _epc;
3689 }
3690
3691 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3692 Thread* thread = context.thread();
3693 OSThread* osthread = thread->osthread();
3694 if (osthread->ucontext() != NULL) {
3695 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext());
3696 } else {
3697 // NULL context is unexpected, double-check this is the VMThread
3698 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3699 }
3700 }
3701
3702 // A lightweight implementation that does not suspend the target thread and
3703 // thus returns only a hint. Used for profiling only!
3704 ExtendedPC os::get_thread_pc(Thread* thread) {
3705 // Make sure that it is called by the watcher and the Threads lock is owned.
3706 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3707 // For now, is only used to profile the VM Thread
3708 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3709 PcFetcher fetcher(thread);
3710 fetcher.run();
3711 return fetcher.result();
3712 }
3713
3714
3715 // This does not do anything on Solaris. This is basically a hook for being
3716 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3717 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3718 const methodHandle& method, JavaCallArguments* args,
3719 Thread* thread) {
3720 f(value, method, args, thread);
3721 }
3722
3723 // This routine may be used by user applications as a "hook" to catch signals.
3724 // The user-defined signal handler must pass unrecognized signals to this
3725 // routine, and if it returns true (non-zero), then the signal handler must
3726 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3727 // routine will never retun false (zero), but instead will execute a VM panic
3728 // routine kill the process.
3729 //
3730 // If this routine returns false, it is OK to call it again. This allows
3731 // the user-defined signal handler to perform checks either before or after
3732 // the VM performs its own checks. Naturally, the user code would be making
3733 // a serious error if it tried to handle an exception (such as a null check
3734 // or breakpoint) that the VM was generating for its own correct operation.
3735 //
3736 // This routine may recognize any of the following kinds of signals:
3737 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3738 // ASYNC_SIGNAL.
3739 // It should be consulted by handlers for any of those signals.
3740 //
3741 // The caller of this routine must pass in the three arguments supplied
3742 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3743 // field of the structure passed to sigaction(). This routine assumes that
3744 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3745 //
3746 // Note that the VM will print warnings if it detects conflicting signal
3747 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3748 //
3749 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3750 siginfo_t* siginfo,
3751 void* ucontext,
3752 int abort_if_unrecognized);
3753
3754
3755 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3756 int orig_errno = errno; // Preserve errno value over signal handler.
3757 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3758 errno = orig_errno;
3759 }
3760
3761 // This boolean allows users to forward their own non-matching signals
3762 // to JVM_handle_solaris_signal, harmlessly.
3763 bool os::Solaris::signal_handlers_are_installed = false;
3764
3765 // For signal-chaining
3766 bool os::Solaris::libjsig_is_loaded = false;
3767 typedef struct sigaction *(*get_signal_t)(int);
3768 get_signal_t os::Solaris::get_signal_action = NULL;
3769
3770 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3771 struct sigaction *actp = NULL;
3772
3773 if ((libjsig_is_loaded) && (sig <= Maxsignum)) {
3774 // Retrieve the old signal handler from libjsig
3775 actp = (*get_signal_action)(sig);
3776 }
3777 if (actp == NULL) {
3778 // Retrieve the preinstalled signal handler from jvm
3779 actp = get_preinstalled_handler(sig);
3780 }
3781
3782 return actp;
3783 }
3784
3785 static bool call_chained_handler(struct sigaction *actp, int sig,
3786 siginfo_t *siginfo, void *context) {
3787 // Call the old signal handler
3788 if (actp->sa_handler == SIG_DFL) {
3789 // It's more reasonable to let jvm treat it as an unexpected exception
3790 // instead of taking the default action.
3791 return false;
3792 } else if (actp->sa_handler != SIG_IGN) {
3793 if ((actp->sa_flags & SA_NODEFER) == 0) {
3794 // automaticlly block the signal
3795 sigaddset(&(actp->sa_mask), sig);
3796 }
3797
3798 sa_handler_t hand;
3799 sa_sigaction_t sa;
3800 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3801 // retrieve the chained handler
3802 if (siginfo_flag_set) {
3803 sa = actp->sa_sigaction;
3804 } else {
3805 hand = actp->sa_handler;
3806 }
3807
3808 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3809 actp->sa_handler = SIG_DFL;
3810 }
3811
3812 // try to honor the signal mask
3813 sigset_t oset;
3814 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3815
3816 // call into the chained handler
3817 if (siginfo_flag_set) {
3818 (*sa)(sig, siginfo, context);
3819 } else {
3820 (*hand)(sig);
3821 }
3822
3823 // restore the signal mask
3824 pthread_sigmask(SIG_SETMASK, &oset, 0);
3825 }
3826 // Tell jvm's signal handler the signal is taken care of.
3827 return true;
3828 }
3829
3830 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3831 bool chained = false;
3832 // signal-chaining
3833 if (UseSignalChaining) {
3834 struct sigaction *actp = get_chained_signal_action(sig);
3835 if (actp != NULL) {
3836 chained = call_chained_handler(actp, sig, siginfo, context);
3837 }
3838 }
3839 return chained;
3840 }
3841
3842 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3843 assert((chainedsigactions != (struct sigaction *)NULL) &&
3844 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3845 if (preinstalled_sigs[sig] != 0) {
3846 return &chainedsigactions[sig];
3847 }
3848 return NULL;
3849 }
3850
3851 void os::Solaris::save_preinstalled_handler(int sig,
3852 struct sigaction& oldAct) {
3853 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3854 assert((chainedsigactions != (struct sigaction *)NULL) &&
3855 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3856 chainedsigactions[sig] = oldAct;
3857 preinstalled_sigs[sig] = 1;
3858 }
3859
3860 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3861 bool oktochain) {
3862 // Check for overwrite.
3863 struct sigaction oldAct;
3864 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3865 void* oldhand =
3866 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3867 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3868 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3869 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3870 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3871 if (AllowUserSignalHandlers || !set_installed) {
3872 // Do not overwrite; user takes responsibility to forward to us.
3873 return;
3874 } else if (UseSignalChaining) {
3875 if (oktochain) {
3876 // save the old handler in jvm
3877 save_preinstalled_handler(sig, oldAct);
3878 } else {
3879 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3880 }
3881 // libjsig also interposes the sigaction() call below and saves the
3882 // old sigaction on it own.
3883 } else {
3884 fatal("Encountered unexpected pre-existing sigaction handler "
3885 "%#lx for signal %d.", (long)oldhand, sig);
3886 }
3887 }
3888
3889 struct sigaction sigAct;
3890 sigfillset(&(sigAct.sa_mask));
3891 sigAct.sa_handler = SIG_DFL;
3892
3893 sigAct.sa_sigaction = signalHandler;
3894 // Handle SIGSEGV on alternate signal stack if
3895 // not using stack banging
3896 if (!UseStackBanging && sig == SIGSEGV) {
3897 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3898 } else {
3899 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3900 }
3901 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3902
3903 sigaction(sig, &sigAct, &oldAct);
3904
3905 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3906 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3907 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3908 }
3909
3910
3911 #define DO_SIGNAL_CHECK(sig) \
3912 do { \
3913 if (!sigismember(&check_signal_done, sig)) { \
3914 os::Solaris::check_signal_handler(sig); \
3915 } \
3916 } while (0)
3917
3918 // This method is a periodic task to check for misbehaving JNI applications
3919 // under CheckJNI, we can add any periodic checks here
3920
3921 void os::run_periodic_checks() {
3922 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3923 // thereby preventing a NULL checks.
3924 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3925
3926 if (check_signals == false) return;
3927
3928 // SEGV and BUS if overridden could potentially prevent
3929 // generation of hs*.log in the event of a crash, debugging
3930 // such a case can be very challenging, so we absolutely
3931 // check for the following for a good measure:
3932 DO_SIGNAL_CHECK(SIGSEGV);
3933 DO_SIGNAL_CHECK(SIGILL);
3934 DO_SIGNAL_CHECK(SIGFPE);
3935 DO_SIGNAL_CHECK(SIGBUS);
3936 DO_SIGNAL_CHECK(SIGPIPE);
3937 DO_SIGNAL_CHECK(SIGXFSZ);
3938 DO_SIGNAL_CHECK(ASYNC_SIGNAL);
3939
3940 // ReduceSignalUsage allows the user to override these handlers
3941 // see comments at the very top and jvm_solaris.h
3942 if (!ReduceSignalUsage) {
3943 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3944 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3945 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3946 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3947 }
3948 }
3949
3950 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3951
3952 static os_sigaction_t os_sigaction = NULL;
3953
3954 void os::Solaris::check_signal_handler(int sig) {
3955 char buf[O_BUFLEN];
3956 address jvmHandler = NULL;
3957
3958 struct sigaction act;
3959 if (os_sigaction == NULL) {
3960 // only trust the default sigaction, in case it has been interposed
3961 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3962 if (os_sigaction == NULL) return;
3963 }
3964
3965 os_sigaction(sig, (struct sigaction*)NULL, &act);
3966
3967 address thisHandler = (act.sa_flags & SA_SIGINFO)
3968 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3969 : CAST_FROM_FN_PTR(address, act.sa_handler);
3970
3971
3972 switch (sig) {
3973 case SIGSEGV:
3974 case SIGBUS:
3975 case SIGFPE:
3976 case SIGPIPE:
3977 case SIGXFSZ:
3978 case SIGILL:
3979 case ASYNC_SIGNAL:
3980 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
3981 break;
3982
3983 case SHUTDOWN1_SIGNAL:
3984 case SHUTDOWN2_SIGNAL:
3985 case SHUTDOWN3_SIGNAL:
3986 case BREAK_SIGNAL:
3987 jvmHandler = (address)user_handler();
3988 break;
3989
3990 default:
3991 return;
3992 }
3993
3994 if (thisHandler != jvmHandler) {
3995 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3996 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3997 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3998 // No need to check this sig any longer
3999 sigaddset(&check_signal_done, sig);
4000 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4001 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4002 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4003 exception_name(sig, buf, O_BUFLEN));
4004 }
4005 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4006 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4007 tty->print("expected:");
4008 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
4009 tty->cr();
4010 tty->print(" found:");
4011 os::Posix::print_sa_flags(tty, act.sa_flags);
4012 tty->cr();
4013 // No need to check this sig any longer
4014 sigaddset(&check_signal_done, sig);
4015 }
4016
4017 // Print all the signal handler state
4018 if (sigismember(&check_signal_done, sig)) {
4019 print_signal_handlers(tty, buf, O_BUFLEN);
4020 }
4021
4022 }
4023
4024 void os::Solaris::install_signal_handlers() {
4025 signal_handlers_are_installed = true;
4026
4027 // signal-chaining
4028 typedef void (*signal_setting_t)();
4029 signal_setting_t begin_signal_setting = NULL;
4030 signal_setting_t end_signal_setting = NULL;
4031 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4032 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4033 if (begin_signal_setting != NULL) {
4034 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4035 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4036 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4037 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4038 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4039 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4040 libjsig_is_loaded = true;
4041 if (os::Solaris::get_libjsig_version != NULL) {
4042 int libjsigversion = (*os::Solaris::get_libjsig_version)();
4043 assert(libjsigversion == JSIG_VERSION_1_4_1, "libjsig version mismatch");
4044 }
4045 assert(UseSignalChaining, "should enable signal-chaining");
4046 }
4047 if (libjsig_is_loaded) {
4048 // Tell libjsig jvm is setting signal handlers
4049 (*begin_signal_setting)();
4050 }
4051
4052 set_signal_handler(SIGSEGV, true, true);
4053 set_signal_handler(SIGPIPE, true, true);
4054 set_signal_handler(SIGXFSZ, true, true);
4055 set_signal_handler(SIGBUS, true, true);
4056 set_signal_handler(SIGILL, true, true);
4057 set_signal_handler(SIGFPE, true, true);
4058 set_signal_handler(ASYNC_SIGNAL, true, true);
4059
4060 if (libjsig_is_loaded) {
4061 // Tell libjsig jvm finishes setting signal handlers
4062 (*end_signal_setting)();
4063 }
4064
4065 // We don't activate signal checker if libjsig is in place, we trust ourselves
4066 // and if UserSignalHandler is installed all bets are off.
4067 // Log that signal checking is off only if -verbose:jni is specified.
4068 if (CheckJNICalls) {
4069 if (libjsig_is_loaded) {
4070 if (PrintJNIResolving) {
4071 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4072 }
4073 check_signals = false;
4074 }
4075 if (AllowUserSignalHandlers) {
4076 if (PrintJNIResolving) {
4077 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4078 }
4079 check_signals = false;
4080 }
4081 }
4082 }
4083
4084
4085 void report_error(const char* file_name, int line_no, const char* title,
4086 const char* format, ...);
4087
4088 // (Static) wrappers for the liblgrp API
4089 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4090 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4091 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4092 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4093 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4094 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4095 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4096 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4097 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4098
4099 static address resolve_symbol_lazy(const char* name) {
4100 address addr = (address) dlsym(RTLD_DEFAULT, name);
4101 if (addr == NULL) {
4102 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4103 addr = (address) dlsym(RTLD_NEXT, name);
4104 }
4105 return addr;
4106 }
4107
4108 static address resolve_symbol(const char* name) {
4109 address addr = resolve_symbol_lazy(name);
4110 if (addr == NULL) {
4111 fatal(dlerror());
4112 }
4113 return addr;
4114 }
4115
4116 void os::Solaris::libthread_init() {
4117 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4118
4119 lwp_priocntl_init();
4120
4121 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4122 if (func == NULL) {
4123 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4124 // Guarantee that this VM is running on an new enough OS (5.6 or
4125 // later) that it will have a new enough libthread.so.
4126 guarantee(func != NULL, "libthread.so is too old.");
4127 }
4128
4129 int size;
4130 void (*handler_info_func)(address *, int *);
4131 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4132 handler_info_func(&handler_start, &size);
4133 handler_end = handler_start + size;
4134 }
4135
4136
4137 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4138 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4139 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4140 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4141 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4142 int os::Solaris::_mutex_scope = USYNC_THREAD;
4143
4144 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4145 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4146 int_fnP_cond_tP os::Solaris::_cond_signal;
4147 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4148 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4149 int_fnP_cond_tP os::Solaris::_cond_destroy;
4150 int os::Solaris::_cond_scope = USYNC_THREAD;
4151
4152 void os::Solaris::synchronization_init() {
4153 if (UseLWPSynchronization) {
4154 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4155 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4156 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4157 os::Solaris::set_mutex_init(lwp_mutex_init);
4158 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4159 os::Solaris::set_mutex_scope(USYNC_THREAD);
4160
4161 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4162 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4163 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4164 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4165 os::Solaris::set_cond_init(lwp_cond_init);
4166 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4167 os::Solaris::set_cond_scope(USYNC_THREAD);
4168 } else {
4169 os::Solaris::set_mutex_scope(USYNC_THREAD);
4170 os::Solaris::set_cond_scope(USYNC_THREAD);
4171
4172 if (UsePthreads) {
4173 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4174 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4175 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4176 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4177 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4178
4179 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4180 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4181 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4182 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4183 os::Solaris::set_cond_init(pthread_cond_default_init);
4184 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4185 } else {
4186 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4187 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4188 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4189 os::Solaris::set_mutex_init(::mutex_init);
4190 os::Solaris::set_mutex_destroy(::mutex_destroy);
4191
4192 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4193 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4194 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4195 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4196 os::Solaris::set_cond_init(::cond_init);
4197 os::Solaris::set_cond_destroy(::cond_destroy);
4198 }
4199 }
4200 }
4201
4202 bool os::Solaris::liblgrp_init() {
4203 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4204 if (handle != NULL) {
4205 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4206 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4207 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4208 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4209 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4210 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4211 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4212 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4213 dlsym(handle, "lgrp_cookie_stale")));
4214
4215 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4216 set_lgrp_cookie(c);
4217 return true;
4218 }
4219 return false;
4220 }
4221
4222 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4223 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4224 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4225
4226 void init_pset_getloadavg_ptr(void) {
4227 pset_getloadavg_ptr =
4228 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4229 if (pset_getloadavg_ptr == NULL) {
4230 log_warning(os)("pset_getloadavg function not found");
4231 }
4232 }
4233
4234 int os::Solaris::_dev_zero_fd = -1;
4235
4236 // this is called _before_ the global arguments have been parsed
4237 void os::init(void) {
4238 _initial_pid = getpid();
4239
4240 max_hrtime = first_hrtime = gethrtime();
4241
4242 init_random(1234567);
4243
4244 page_size = sysconf(_SC_PAGESIZE);
4245 if (page_size == -1) {
4246 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4247 }
4248 init_page_sizes((size_t) page_size);
4249
4250 Solaris::initialize_system_info();
4251
4252 int fd = ::open("/dev/zero", O_RDWR);
4253 if (fd < 0) {
4254 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4255 } else {
4256 Solaris::set_dev_zero_fd(fd);
4257
4258 // Close on exec, child won't inherit.
4259 fcntl(fd, F_SETFD, FD_CLOEXEC);
4260 }
4261
4262 clock_tics_per_sec = CLK_TCK;
4263
4264 // check if dladdr1() exists; dladdr1 can provide more information than
4265 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4266 // and is available on linker patches for 5.7 and 5.8.
4267 // libdl.so must have been loaded, this call is just an entry lookup
4268 void * hdl = dlopen("libdl.so", RTLD_NOW);
4269 if (hdl) {
4270 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4271 }
4272
4273 // (Solaris only) this switches to calls that actually do locking.
4274 ThreadCritical::initialize();
4275
4276 main_thread = thr_self();
4277
4278 // dynamic lookup of functions that may not be available in our lowest
4279 // supported Solaris release
4280 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4281 if (handle != NULL) {
4282 Solaris::_pthread_setname_np = // from 11.3
4283 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4284 }
4285 }
4286
4287 // To install functions for atexit system call
4288 extern "C" {
4289 static void perfMemory_exit_helper() {
4290 perfMemory_exit();
4291 }
4292 }
4293
4294 // this is called _after_ the global arguments have been parsed
4295 jint os::init_2(void) {
4296 // try to enable extended file IO ASAP, see 6431278
4297 os::Solaris::try_enable_extended_io();
4298
4299 // Allocate a single page and mark it as readable for safepoint polling. Also
4300 // use this first mmap call to check support for MAP_ALIGN.
4301 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4302 page_size,
4303 MAP_PRIVATE | MAP_ALIGN,
4304 PROT_READ);
4305 if (polling_page == NULL) {
4306 has_map_align = false;
4307 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4308 PROT_READ);
4309 }
4310
4311 os::set_polling_page(polling_page);
4312 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4313
4314 if (!UseMembar) {
4315 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4316 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4317 os::set_memory_serialize_page(mem_serialize_page);
4318 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4319 }
4320
4321 // Check and sets minimum stack sizes against command line options
4322 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4323 return JNI_ERR;
4324 }
4325
4326 Solaris::libthread_init();
4327
4328 if (UseNUMA) {
4329 if (!Solaris::liblgrp_init()) {
4330 UseNUMA = false;
4331 } else {
4332 size_t lgrp_limit = os::numa_get_groups_num();
4333 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4334 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4335 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4336 if (lgrp_num < 2) {
4337 // There's only one locality group, disable NUMA.
4338 UseNUMA = false;
4339 }
4340 }
4341 if (!UseNUMA && ForceNUMA) {
4342 UseNUMA = true;
4343 }
4344 }
4345
4346 Solaris::signal_sets_init();
4347 Solaris::init_signal_mem();
4348 Solaris::install_signal_handlers();
4349
4350 // initialize synchronization primitives to use either thread or
4351 // lwp synchronization (controlled by UseLWPSynchronization)
4352 Solaris::synchronization_init();
4353
4354 if (MaxFDLimit) {
4355 // set the number of file descriptors to max. print out error
4356 // if getrlimit/setrlimit fails but continue regardless.
4357 struct rlimit nbr_files;
4358 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4359 if (status != 0) {
4360 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4361 } else {
4362 nbr_files.rlim_cur = nbr_files.rlim_max;
4363 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4364 if (status != 0) {
4365 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4366 }
4367 }
4368 }
4369
4370 // Calculate theoretical max. size of Threads to guard gainst
4371 // artifical out-of-memory situations, where all available address-
4372 // space has been reserved by thread stacks. Default stack size is 1Mb.
4373 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4374 JavaThread::stack_size_at_create() : (1*K*K);
4375 assert(pre_thread_stack_size != 0, "Must have a stack");
4376 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4377 // we should start doing Virtual Memory banging. Currently when the threads will
4378 // have used all but 200Mb of space.
4379 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4380 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4381
4382 // at-exit methods are called in the reverse order of their registration.
4383 // In Solaris 7 and earlier, atexit functions are called on return from
4384 // main or as a result of a call to exit(3C). There can be only 32 of
4385 // these functions registered and atexit() does not set errno. In Solaris
4386 // 8 and later, there is no limit to the number of functions registered
4387 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4388 // functions are called upon dlclose(3DL) in addition to return from main
4389 // and exit(3C).
4390
4391 if (PerfAllowAtExitRegistration) {
4392 // only register atexit functions if PerfAllowAtExitRegistration is set.
4393 // atexit functions can be delayed until process exit time, which
4394 // can be problematic for embedded VM situations. Embedded VMs should
4395 // call DestroyJavaVM() to assure that VM resources are released.
4396
4397 // note: perfMemory_exit_helper atexit function may be removed in
4398 // the future if the appropriate cleanup code can be added to the
4399 // VM_Exit VMOperation's doit method.
4400 if (atexit(perfMemory_exit_helper) != 0) {
4401 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4402 }
4403 }
4404
4405 // Init pset_loadavg function pointer
4406 init_pset_getloadavg_ptr();
4407
4408 return JNI_OK;
4409 }
4410
4411 // Mark the polling page as unreadable
4412 void os::make_polling_page_unreadable(void) {
4413 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4414 fatal("Could not disable polling page");
4415 }
4416 }
4417
4418 // Mark the polling page as readable
4419 void os::make_polling_page_readable(void) {
4420 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4421 fatal("Could not enable polling page");
4422 }
4423 }
4424
4425 // Is a (classpath) directory empty?
4426 bool os::dir_is_empty(const char* path) {
4427 DIR *dir = NULL;
4428 struct dirent *ptr;
4429
4430 dir = opendir(path);
4431 if (dir == NULL) return true;
4432
4433 // Scan the directory
4434 bool result = true;
4435 char buf[sizeof(struct dirent) + MAX_PATH];
4436 struct dirent *dbuf = (struct dirent *) buf;
4437 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4438 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4439 result = false;
4440 }
4441 }
4442 closedir(dir);
4443 return result;
4444 }
4445
4446 // This code originates from JDK's sysOpen and open64_w
4447 // from src/solaris/hpi/src/system_md.c
4448
4449 int os::open(const char *path, int oflag, int mode) {
4450 if (strlen(path) > MAX_PATH - 1) {
4451 errno = ENAMETOOLONG;
4452 return -1;
4453 }
4454 int fd;
4455
4456 fd = ::open64(path, oflag, mode);
4457 if (fd == -1) return -1;
4458
4459 // If the open succeeded, the file might still be a directory
4460 {
4461 struct stat64 buf64;
4462 int ret = ::fstat64(fd, &buf64);
4463 int st_mode = buf64.st_mode;
4464
4465 if (ret != -1) {
4466 if ((st_mode & S_IFMT) == S_IFDIR) {
4467 errno = EISDIR;
4468 ::close(fd);
4469 return -1;
4470 }
4471 } else {
4472 ::close(fd);
4473 return -1;
4474 }
4475 }
4476
4477 // 32-bit Solaris systems suffer from:
4478 //
4479 // - an historical default soft limit of 256 per-process file
4480 // descriptors that is too low for many Java programs.
4481 //
4482 // - a design flaw where file descriptors created using stdio
4483 // fopen must be less than 256, _even_ when the first limit above
4484 // has been raised. This can cause calls to fopen (but not calls to
4485 // open, for example) to fail mysteriously, perhaps in 3rd party
4486 // native code (although the JDK itself uses fopen). One can hardly
4487 // criticize them for using this most standard of all functions.
4488 //
4489 // We attempt to make everything work anyways by:
4490 //
4491 // - raising the soft limit on per-process file descriptors beyond
4492 // 256
4493 //
4494 // - As of Solaris 10u4, we can request that Solaris raise the 256
4495 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4496 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4497 //
4498 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4499 // workaround the bug by remapping non-stdio file descriptors below
4500 // 256 to ones beyond 256, which is done below.
4501 //
4502 // See:
4503 // 1085341: 32-bit stdio routines should support file descriptors >255
4504 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4505 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4506 // enable_extended_FILE_stdio() in VM initialisation
4507 // Giri Mandalika's blog
4508 // http://technopark02.blogspot.com/2005_05_01_archive.html
4509 //
4510 #ifndef _LP64
4511 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4512 int newfd = ::fcntl(fd, F_DUPFD, 256);
4513 if (newfd != -1) {
4514 ::close(fd);
4515 fd = newfd;
4516 }
4517 }
4518 #endif // 32-bit Solaris
4519
4520 // All file descriptors that are opened in the JVM and not
4521 // specifically destined for a subprocess should have the
4522 // close-on-exec flag set. If we don't set it, then careless 3rd
4523 // party native code might fork and exec without closing all
4524 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4525 // UNIXProcess.c), and this in turn might:
4526 //
4527 // - cause end-of-file to fail to be detected on some file
4528 // descriptors, resulting in mysterious hangs, or
4529 //
4530 // - might cause an fopen in the subprocess to fail on a system
4531 // suffering from bug 1085341.
4532 //
4533 // (Yes, the default setting of the close-on-exec flag is a Unix
4534 // design flaw)
4535 //
4536 // See:
4537 // 1085341: 32-bit stdio routines should support file descriptors >255
4538 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4539 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4540 //
4541 #ifdef FD_CLOEXEC
4542 {
4543 int flags = ::fcntl(fd, F_GETFD);
4544 if (flags != -1) {
4545 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4546 }
4547 }
4548 #endif
4549
4550 return fd;
4551 }
4552
4553 // create binary file, rewriting existing file if required
4554 int os::create_binary_file(const char* path, bool rewrite_existing) {
4555 int oflags = O_WRONLY | O_CREAT;
4556 if (!rewrite_existing) {
4557 oflags |= O_EXCL;
4558 }
4559 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4560 }
4561
4562 // return current position of file pointer
4563 jlong os::current_file_offset(int fd) {
4564 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4565 }
4566
4567 // move file pointer to the specified offset
4568 jlong os::seek_to_file_offset(int fd, jlong offset) {
4569 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4570 }
4571
4572 jlong os::lseek(int fd, jlong offset, int whence) {
4573 return (jlong) ::lseek64(fd, offset, whence);
4574 }
4575
4576 char * os::native_path(char *path) {
4577 return path;
4578 }
4579
4580 int os::ftruncate(int fd, jlong length) {
4581 return ::ftruncate64(fd, length);
4582 }
4583
4584 int os::fsync(int fd) {
4585 RESTARTABLE_RETURN_INT(::fsync(fd));
4586 }
4587
4588 int os::available(int fd, jlong *bytes) {
4589 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4590 "Assumed _thread_in_native");
4591 jlong cur, end;
4592 int mode;
4593 struct stat64 buf64;
4594
4595 if (::fstat64(fd, &buf64) >= 0) {
4596 mode = buf64.st_mode;
4597 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4598 int n,ioctl_return;
4599
4600 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4601 if (ioctl_return>= 0) {
4602 *bytes = n;
4603 return 1;
4604 }
4605 }
4606 }
4607 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4608 return 0;
4609 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4610 return 0;
4611 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4612 return 0;
4613 }
4614 *bytes = end - cur;
4615 return 1;
4616 }
4617
4618 // Map a block of memory.
4619 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4620 char *addr, size_t bytes, bool read_only,
4621 bool allow_exec) {
4622 int prot;
4623 int flags;
4624
4625 if (read_only) {
4626 prot = PROT_READ;
4627 flags = MAP_SHARED;
4628 } else {
4629 prot = PROT_READ | PROT_WRITE;
4630 flags = MAP_PRIVATE;
4631 }
4632
4633 if (allow_exec) {
4634 prot |= PROT_EXEC;
4635 }
4636
4637 if (addr != NULL) {
4638 flags |= MAP_FIXED;
4639 }
4640
4641 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4642 fd, file_offset);
4643 if (mapped_address == MAP_FAILED) {
4644 return NULL;
4645 }
4646 return mapped_address;
4647 }
4648
4649
4650 // Remap a block of memory.
4651 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4652 char *addr, size_t bytes, bool read_only,
4653 bool allow_exec) {
4654 // same as map_memory() on this OS
4655 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4656 allow_exec);
4657 }
4658
4659
4660 // Unmap a block of memory.
4661 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4662 return munmap(addr, bytes) == 0;
4663 }
4664
4665 void os::pause() {
4666 char filename[MAX_PATH];
4667 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4668 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4669 } else {
4670 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4671 }
4672
4673 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4674 if (fd != -1) {
4675 struct stat buf;
4676 ::close(fd);
4677 while (::stat(filename, &buf) == 0) {
4678 (void)::poll(NULL, 0, 100);
4679 }
4680 } else {
4681 jio_fprintf(stderr,
4682 "Could not open pause file '%s', continuing immediately.\n", filename);
4683 }
4684 }
4685
4686 #ifndef PRODUCT
4687 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4688 // Turn this on if you need to trace synch operations.
4689 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4690 // and call record_synch_enable and record_synch_disable
4691 // around the computation of interest.
4692
4693 void record_synch(char* name, bool returning); // defined below
4694
4695 class RecordSynch {
4696 char* _name;
4697 public:
4698 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4699 ~RecordSynch() { record_synch(_name, true); }
4700 };
4701
4702 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4703 extern "C" ret name params { \
4704 typedef ret name##_t params; \
4705 static name##_t* implem = NULL; \
4706 static int callcount = 0; \
4707 if (implem == NULL) { \
4708 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4709 if (implem == NULL) fatal(dlerror()); \
4710 } \
4711 ++callcount; \
4712 RecordSynch _rs(#name); \
4713 inner; \
4714 return implem args; \
4715 }
4716 // in dbx, examine callcounts this way:
4717 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4718
4719 #define CHECK_POINTER_OK(p) \
4720 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4721 #define CHECK_MU \
4722 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4723 #define CHECK_CV \
4724 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4725 #define CHECK_P(p) \
4726 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4727
4728 #define CHECK_MUTEX(mutex_op) \
4729 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4730
4731 CHECK_MUTEX( mutex_lock)
4732 CHECK_MUTEX( _mutex_lock)
4733 CHECK_MUTEX( mutex_unlock)
4734 CHECK_MUTEX(_mutex_unlock)
4735 CHECK_MUTEX( mutex_trylock)
4736 CHECK_MUTEX(_mutex_trylock)
4737
4738 #define CHECK_COND(cond_op) \
4739 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4740
4741 CHECK_COND( cond_wait);
4742 CHECK_COND(_cond_wait);
4743 CHECK_COND(_cond_wait_cancel);
4744
4745 #define CHECK_COND2(cond_op) \
4746 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4747
4748 CHECK_COND2( cond_timedwait);
4749 CHECK_COND2(_cond_timedwait);
4750 CHECK_COND2(_cond_timedwait_cancel);
4751
4752 // do the _lwp_* versions too
4753 #define mutex_t lwp_mutex_t
4754 #define cond_t lwp_cond_t
4755 CHECK_MUTEX( _lwp_mutex_lock)
4756 CHECK_MUTEX( _lwp_mutex_unlock)
4757 CHECK_MUTEX( _lwp_mutex_trylock)
4758 CHECK_MUTEX( __lwp_mutex_lock)
4759 CHECK_MUTEX( __lwp_mutex_unlock)
4760 CHECK_MUTEX( __lwp_mutex_trylock)
4761 CHECK_MUTEX(___lwp_mutex_lock)
4762 CHECK_MUTEX(___lwp_mutex_unlock)
4763
4764 CHECK_COND( _lwp_cond_wait);
4765 CHECK_COND( __lwp_cond_wait);
4766 CHECK_COND(___lwp_cond_wait);
4767
4768 CHECK_COND2( _lwp_cond_timedwait);
4769 CHECK_COND2( __lwp_cond_timedwait);
4770 #undef mutex_t
4771 #undef cond_t
4772
4773 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4774 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4775 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4776 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4777 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4778 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4779 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4780 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4781
4782
4783 // recording machinery:
4784
4785 enum { RECORD_SYNCH_LIMIT = 200 };
4786 char* record_synch_name[RECORD_SYNCH_LIMIT];
4787 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4788 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4789 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4790 int record_synch_count = 0;
4791 bool record_synch_enabled = false;
4792
4793 // in dbx, examine recorded data this way:
4794 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4795
4796 void record_synch(char* name, bool returning) {
4797 if (record_synch_enabled) {
4798 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4799 record_synch_name[record_synch_count] = name;
4800 record_synch_returning[record_synch_count] = returning;
4801 record_synch_thread[record_synch_count] = thr_self();
4802 record_synch_arg0ptr[record_synch_count] = &name;
4803 record_synch_count++;
4804 }
4805 // put more checking code here:
4806 // ...
4807 }
4808 }
4809
4810 void record_synch_enable() {
4811 // start collecting trace data, if not already doing so
4812 if (!record_synch_enabled) record_synch_count = 0;
4813 record_synch_enabled = true;
4814 }
4815
4816 void record_synch_disable() {
4817 // stop collecting trace data
4818 record_synch_enabled = false;
4819 }
4820
4821 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4822 #endif // PRODUCT
4823
4824 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4825 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4826 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4827
4828
4829 // JVMTI & JVM monitoring and management support
4830 // The thread_cpu_time() and current_thread_cpu_time() are only
4831 // supported if is_thread_cpu_time_supported() returns true.
4832 // They are not supported on Solaris T1.
4833
4834 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4835 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4836 // of a thread.
4837 //
4838 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4839 // returns the fast estimate available on the platform.
4840
4841 // hrtime_t gethrvtime() return value includes
4842 // user time but does not include system time
4843 jlong os::current_thread_cpu_time() {
4844 return (jlong) gethrvtime();
4845 }
4846
4847 jlong os::thread_cpu_time(Thread *thread) {
4848 // return user level CPU time only to be consistent with
4849 // what current_thread_cpu_time returns.
4850 // thread_cpu_time_info() must be changed if this changes
4851 return os::thread_cpu_time(thread, false /* user time only */);
4852 }
4853
4854 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4855 if (user_sys_cpu_time) {
4856 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4857 } else {
4858 return os::current_thread_cpu_time();
4859 }
4860 }
4861
4862 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4863 char proc_name[64];
4864 int count;
4865 prusage_t prusage;
4866 jlong lwp_time;
4867 int fd;
4868
4869 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4870 getpid(),
4871 thread->osthread()->lwp_id());
4872 fd = ::open(proc_name, O_RDONLY);
4873 if (fd == -1) return -1;
4874
4875 do {
4876 count = ::pread(fd,
4877 (void *)&prusage.pr_utime,
4878 thr_time_size,
4879 thr_time_off);
4880 } while (count < 0 && errno == EINTR);
4881 ::close(fd);
4882 if (count < 0) return -1;
4883
4884 if (user_sys_cpu_time) {
4885 // user + system CPU time
4886 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4887 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4888 (jlong)prusage.pr_stime.tv_nsec +
4889 (jlong)prusage.pr_utime.tv_nsec;
4890 } else {
4891 // user level CPU time only
4892 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4893 (jlong)prusage.pr_utime.tv_nsec;
4894 }
4895
4896 return (lwp_time);
4897 }
4898
4899 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4900 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4901 info_ptr->may_skip_backward = false; // elapsed time not wall time
4902 info_ptr->may_skip_forward = false; // elapsed time not wall time
4903 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4904 }
4905
4906 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4907 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4908 info_ptr->may_skip_backward = false; // elapsed time not wall time
4909 info_ptr->may_skip_forward = false; // elapsed time not wall time
4910 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4911 }
4912
4913 bool os::is_thread_cpu_time_supported() {
4914 return true;
4915 }
4916
4917 // System loadavg support. Returns -1 if load average cannot be obtained.
4918 // Return the load average for our processor set if the primitive exists
4919 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4920 int os::loadavg(double loadavg[], int nelem) {
4921 if (pset_getloadavg_ptr != NULL) {
4922 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4923 } else {
4924 return ::getloadavg(loadavg, nelem);
4925 }
4926 }
4927
4928 //---------------------------------------------------------------------------------
4929
4930 bool os::find(address addr, outputStream* st) {
4931 Dl_info dlinfo;
4932 memset(&dlinfo, 0, sizeof(dlinfo));
4933 if (dladdr(addr, &dlinfo) != 0) {
4934 st->print(PTR_FORMAT ": ", addr);
4935 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4936 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4937 } else if (dlinfo.dli_fbase != NULL) {
4938 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4939 } else {
4940 st->print("<absolute address>");
4941 }
4942 if (dlinfo.dli_fname != NULL) {
4943 st->print(" in %s", dlinfo.dli_fname);
4944 }
4945 if (dlinfo.dli_fbase != NULL) {
4946 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
4947 }
4948 st->cr();
4949
4950 if (Verbose) {
4951 // decode some bytes around the PC
4952 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
4953 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
4954 address lowest = (address) dlinfo.dli_sname;
4955 if (!lowest) lowest = (address) dlinfo.dli_fbase;
4956 if (begin < lowest) begin = lowest;
4957 Dl_info dlinfo2;
4958 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
4959 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
4960 end = (address) dlinfo2.dli_saddr;
4961 }
4962 Disassembler::decode(begin, end, st);
4963 }
4964 return true;
4965 }
4966 return false;
4967 }
4968
4969 // Following function has been added to support HotSparc's libjvm.so running
4970 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
4971 // src/solaris/hpi/native_threads in the EVM codebase.
4972 //
4973 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
4974 // libraries and should thus be removed. We will leave it behind for a while
4975 // until we no longer want to able to run on top of 1.3.0 Solaris production
4976 // JDK. See 4341971.
4977
4978 #define STACK_SLACK 0x800
4979
4980 extern "C" {
4981 intptr_t sysThreadAvailableStackWithSlack() {
4982 stack_t st;
4983 intptr_t retval, stack_top;
4984 retval = thr_stksegment(&st);
4985 assert(retval == 0, "incorrect return value from thr_stksegment");
4986 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
4987 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
4988 stack_top=(intptr_t)st.ss_sp-st.ss_size;
4989 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
4990 }
4991 }
4992
4993 // ObjectMonitor park-unpark infrastructure ...
4994 //
4995 // We implement Solaris and Linux PlatformEvents with the
4996 // obvious condvar-mutex-flag triple.
4997 // Another alternative that works quite well is pipes:
4998 // Each PlatformEvent consists of a pipe-pair.
4999 // The thread associated with the PlatformEvent
5000 // calls park(), which reads from the input end of the pipe.
5001 // Unpark() writes into the other end of the pipe.
5002 // The write-side of the pipe must be set NDELAY.
5003 // Unfortunately pipes consume a large # of handles.
5004 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5005 // Using pipes for the 1st few threads might be workable, however.
5006 //
5007 // park() is permitted to return spuriously.
5008 // Callers of park() should wrap the call to park() in
5009 // an appropriate loop. A litmus test for the correct
5010 // usage of park is the following: if park() were modified
5011 // to immediately return 0 your code should still work,
5012 // albeit degenerating to a spin loop.
5013 //
5014 // In a sense, park()-unpark() just provides more polite spinning
5015 // and polling with the key difference over naive spinning being
5016 // that a parked thread needs to be explicitly unparked() in order
5017 // to wake up and to poll the underlying condition.
5018 //
5019 // Assumption:
5020 // Only one parker can exist on an event, which is why we allocate
5021 // them per-thread. Multiple unparkers can coexist.
5022 //
5023 // _Event transitions in park()
5024 // -1 => -1 : illegal
5025 // 1 => 0 : pass - return immediately
5026 // 0 => -1 : block; then set _Event to 0 before returning
5027 //
5028 // _Event transitions in unpark()
5029 // 0 => 1 : just return
5030 // 1 => 1 : just return
5031 // -1 => either 0 or 1; must signal target thread
5032 // That is, we can safely transition _Event from -1 to either
5033 // 0 or 1.
5034 //
5035 // _Event serves as a restricted-range semaphore.
5036 // -1 : thread is blocked, i.e. there is a waiter
5037 // 0 : neutral: thread is running or ready,
5038 // could have been signaled after a wait started
5039 // 1 : signaled - thread is running or ready
5040 //
5041 // Another possible encoding of _Event would be with
5042 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5043 //
5044 // TODO-FIXME: add DTRACE probes for:
5045 // 1. Tx parks
5046 // 2. Ty unparks Tx
5047 // 3. Tx resumes from park
5048
5049
5050 // value determined through experimentation
5051 #define ROUNDINGFIX 11
5052
5053 // utility to compute the abstime argument to timedwait.
5054 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5055
5056 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5057 // millis is the relative timeout time
5058 // abstime will be the absolute timeout time
5059 if (millis < 0) millis = 0;
5060 struct timeval now;
5061 int status = gettimeofday(&now, NULL);
5062 assert(status == 0, "gettimeofday");
5063 jlong seconds = millis / 1000;
5064 jlong max_wait_period;
5065
5066 if (UseLWPSynchronization) {
5067 // forward port of fix for 4275818 (not sleeping long enough)
5068 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5069 // _lwp_cond_timedwait() used a round_down algorithm rather
5070 // than a round_up. For millis less than our roundfactor
5071 // it rounded down to 0 which doesn't meet the spec.
5072 // For millis > roundfactor we may return a bit sooner, but
5073 // since we can not accurately identify the patch level and
5074 // this has already been fixed in Solaris 9 and 8 we will
5075 // leave it alone rather than always rounding down.
5076
5077 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5078 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5079 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5080 max_wait_period = 21000000;
5081 } else {
5082 max_wait_period = 50000000;
5083 }
5084 millis %= 1000;
5085 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5086 seconds = max_wait_period;
5087 }
5088 abstime->tv_sec = now.tv_sec + seconds;
5089 long usec = now.tv_usec + millis * 1000;
5090 if (usec >= 1000000) {
5091 abstime->tv_sec += 1;
5092 usec -= 1000000;
5093 }
5094 abstime->tv_nsec = usec * 1000;
5095 return abstime;
5096 }
5097
5098 void os::PlatformEvent::park() { // AKA: down()
5099 // Transitions for _Event:
5100 // -1 => -1 : illegal
5101 // 1 => 0 : pass - return immediately
5102 // 0 => -1 : block; then set _Event to 0 before returning
5103
5104 // Invariant: Only the thread associated with the Event/PlatformEvent
5105 // may call park().
5106 assert(_nParked == 0, "invariant");
5107
5108 int v;
5109 for (;;) {
5110 v = _Event;
5111 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5112 }
5113 guarantee(v >= 0, "invariant");
5114 if (v == 0) {
5115 // Do this the hard way by blocking ...
5116 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5117 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5118 // Only for SPARC >= V8PlusA
5119 #if defined(__sparc) && defined(COMPILER2)
5120 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5121 #endif
5122 int status = os::Solaris::mutex_lock(_mutex);
5123 assert_status(status == 0, status, "mutex_lock");
5124 guarantee(_nParked == 0, "invariant");
5125 ++_nParked;
5126 while (_Event < 0) {
5127 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5128 // Treat this the same as if the wait was interrupted
5129 // With usr/lib/lwp going to kernel, always handle ETIME
5130 status = os::Solaris::cond_wait(_cond, _mutex);
5131 if (status == ETIME) status = EINTR;
5132 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5133 }
5134 --_nParked;
5135 _Event = 0;
5136 status = os::Solaris::mutex_unlock(_mutex);
5137 assert_status(status == 0, status, "mutex_unlock");
5138 // Paranoia to ensure our locked and lock-free paths interact
5139 // correctly with each other.
5140 OrderAccess::fence();
5141 }
5142 }
5143
5144 int os::PlatformEvent::park(jlong millis) {
5145 // Transitions for _Event:
5146 // -1 => -1 : illegal
5147 // 1 => 0 : pass - return immediately
5148 // 0 => -1 : block; then set _Event to 0 before returning
5149
5150 guarantee(_nParked == 0, "invariant");
5151 int v;
5152 for (;;) {
5153 v = _Event;
5154 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5155 }
5156 guarantee(v >= 0, "invariant");
5157 if (v != 0) return OS_OK;
5158
5159 int ret = OS_TIMEOUT;
5160 timestruc_t abst;
5161 compute_abstime(&abst, millis);
5162
5163 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5164 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5165 // Only for SPARC >= V8PlusA
5166 #if defined(__sparc) && defined(COMPILER2)
5167 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5168 #endif
5169 int status = os::Solaris::mutex_lock(_mutex);
5170 assert_status(status == 0, status, "mutex_lock");
5171 guarantee(_nParked == 0, "invariant");
5172 ++_nParked;
5173 while (_Event < 0) {
5174 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5175 assert_status(status == 0 || status == EINTR ||
5176 status == ETIME || status == ETIMEDOUT,
5177 status, "cond_timedwait");
5178 if (!FilterSpuriousWakeups) break; // previous semantics
5179 if (status == ETIME || status == ETIMEDOUT) break;
5180 // We consume and ignore EINTR and spurious wakeups.
5181 }
5182 --_nParked;
5183 if (_Event >= 0) ret = OS_OK;
5184 _Event = 0;
5185 status = os::Solaris::mutex_unlock(_mutex);
5186 assert_status(status == 0, status, "mutex_unlock");
5187 // Paranoia to ensure our locked and lock-free paths interact
5188 // correctly with each other.
5189 OrderAccess::fence();
5190 return ret;
5191 }
5192
5193 void os::PlatformEvent::unpark() {
5194 // Transitions for _Event:
5195 // 0 => 1 : just return
5196 // 1 => 1 : just return
5197 // -1 => either 0 or 1; must signal target thread
5198 // That is, we can safely transition _Event from -1 to either
5199 // 0 or 1.
5200 // See also: "Semaphores in Plan 9" by Mullender & Cox
5201 //
5202 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5203 // that it will take two back-to-back park() calls for the owning
5204 // thread to block. This has the benefit of forcing a spurious return
5205 // from the first park() call after an unpark() call which will help
5206 // shake out uses of park() and unpark() without condition variables.
5207
5208 if (Atomic::xchg(1, &_Event) >= 0) return;
5209
5210 // If the thread associated with the event was parked, wake it.
5211 // Wait for the thread assoc with the PlatformEvent to vacate.
5212 int status = os::Solaris::mutex_lock(_mutex);
5213 assert_status(status == 0, status, "mutex_lock");
5214 int AnyWaiters = _nParked;
5215 status = os::Solaris::mutex_unlock(_mutex);
5216 assert_status(status == 0, status, "mutex_unlock");
5217 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5218 if (AnyWaiters != 0) {
5219 // Note that we signal() *after* dropping the lock for "immortal" Events.
5220 // This is safe and avoids a common class of futile wakeups. In rare
5221 // circumstances this can cause a thread to return prematurely from
5222 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5223 // will simply re-test the condition and re-park itself.
5224 // This provides particular benefit if the underlying platform does not
5225 // provide wait morphing.
5226 status = os::Solaris::cond_signal(_cond);
5227 assert_status(status == 0, status, "cond_signal");
5228 }
5229 }
5230
5231 // JSR166
5232 // -------------------------------------------------------
5233
5234 // The solaris and linux implementations of park/unpark are fairly
5235 // conservative for now, but can be improved. They currently use a
5236 // mutex/condvar pair, plus _counter.
5237 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5238 // sets count to 1 and signals condvar. Only one thread ever waits
5239 // on the condvar. Contention seen when trying to park implies that someone
5240 // is unparking you, so don't wait. And spurious returns are fine, so there
5241 // is no need to track notifications.
5242
5243 #define MAX_SECS 100000000
5244
5245 // This code is common to linux and solaris and will be moved to a
5246 // common place in dolphin.
5247 //
5248 // The passed in time value is either a relative time in nanoseconds
5249 // or an absolute time in milliseconds. Either way it has to be unpacked
5250 // into suitable seconds and nanoseconds components and stored in the
5251 // given timespec structure.
5252 // Given time is a 64-bit value and the time_t used in the timespec is only
5253 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5254 // overflow if times way in the future are given. Further on Solaris versions
5255 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5256 // number of seconds, in abstime, is less than current_time + 100,000,000.
5257 // As it will be 28 years before "now + 100000000" will overflow we can
5258 // ignore overflow and just impose a hard-limit on seconds using the value
5259 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5260 // years from "now".
5261 //
5262 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5263 assert(time > 0, "convertTime");
5264
5265 struct timeval now;
5266 int status = gettimeofday(&now, NULL);
5267 assert(status == 0, "gettimeofday");
5268
5269 time_t max_secs = now.tv_sec + MAX_SECS;
5270
5271 if (isAbsolute) {
5272 jlong secs = time / 1000;
5273 if (secs > max_secs) {
5274 absTime->tv_sec = max_secs;
5275 } else {
5276 absTime->tv_sec = secs;
5277 }
5278 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5279 } else {
5280 jlong secs = time / NANOSECS_PER_SEC;
5281 if (secs >= MAX_SECS) {
5282 absTime->tv_sec = max_secs;
5283 absTime->tv_nsec = 0;
5284 } else {
5285 absTime->tv_sec = now.tv_sec + secs;
5286 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5287 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5288 absTime->tv_nsec -= NANOSECS_PER_SEC;
5289 ++absTime->tv_sec; // note: this must be <= max_secs
5290 }
5291 }
5292 }
5293 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5294 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5295 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5296 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5297 }
5298
5299 void Parker::park(bool isAbsolute, jlong time) {
5300 // Ideally we'd do something useful while spinning, such
5301 // as calling unpackTime().
5302
5303 // Optional fast-path check:
5304 // Return immediately if a permit is available.
5305 // We depend on Atomic::xchg() having full barrier semantics
5306 // since we are doing a lock-free update to _counter.
5307 if (Atomic::xchg(0, &_counter) > 0) return;
5308
5309 // Optional fast-exit: Check interrupt before trying to wait
5310 Thread* thread = Thread::current();
5311 assert(thread->is_Java_thread(), "Must be JavaThread");
5312 JavaThread *jt = (JavaThread *)thread;
5313 if (Thread::is_interrupted(thread, false)) {
5314 return;
5315 }
5316
5317 // First, demultiplex/decode time arguments
5318 timespec absTime;
5319 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5320 return;
5321 }
5322 if (time > 0) {
5323 // Warning: this code might be exposed to the old Solaris time
5324 // round-down bugs. Grep "roundingFix" for details.
5325 unpackTime(&absTime, isAbsolute, time);
5326 }
5327
5328 // Enter safepoint region
5329 // Beware of deadlocks such as 6317397.
5330 // The per-thread Parker:: _mutex is a classic leaf-lock.
5331 // In particular a thread must never block on the Threads_lock while
5332 // holding the Parker:: mutex. If safepoints are pending both the
5333 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5334 ThreadBlockInVM tbivm(jt);
5335
5336 // Don't wait if cannot get lock since interference arises from
5337 // unblocking. Also. check interrupt before trying wait
5338 if (Thread::is_interrupted(thread, false) ||
5339 os::Solaris::mutex_trylock(_mutex) != 0) {
5340 return;
5341 }
5342
5343 int status;
5344
5345 if (_counter > 0) { // no wait needed
5346 _counter = 0;
5347 status = os::Solaris::mutex_unlock(_mutex);
5348 assert(status == 0, "invariant");
5349 // Paranoia to ensure our locked and lock-free paths interact
5350 // correctly with each other and Java-level accesses.
5351 OrderAccess::fence();
5352 return;
5353 }
5354
5355 #ifdef ASSERT
5356 // Don't catch signals while blocked; let the running threads have the signals.
5357 // (This allows a debugger to break into the running thread.)
5358 sigset_t oldsigs;
5359 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5360 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5361 #endif
5362
5363 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5364 jt->set_suspend_equivalent();
5365 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5366
5367 // Do this the hard way by blocking ...
5368 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5369 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5370 // Only for SPARC >= V8PlusA
5371 #if defined(__sparc) && defined(COMPILER2)
5372 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5373 #endif
5374
5375 if (time == 0) {
5376 status = os::Solaris::cond_wait(_cond, _mutex);
5377 } else {
5378 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5379 }
5380 // Note that an untimed cond_wait() can sometimes return ETIME on older
5381 // versions of the Solaris.
5382 assert_status(status == 0 || status == EINTR ||
5383 status == ETIME || status == ETIMEDOUT,
5384 status, "cond_timedwait");
5385
5386 #ifdef ASSERT
5387 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
5388 #endif
5389 _counter = 0;
5390 status = os::Solaris::mutex_unlock(_mutex);
5391 assert_status(status == 0, status, "mutex_unlock");
5392 // Paranoia to ensure our locked and lock-free paths interact
5393 // correctly with each other and Java-level accesses.
5394 OrderAccess::fence();
5395
5396 // If externally suspended while waiting, re-suspend
5397 if (jt->handle_special_suspend_equivalent_condition()) {
5398 jt->java_suspend_self();
5399 }
5400 }
5401
5402 void Parker::unpark() {
5403 int status = os::Solaris::mutex_lock(_mutex);
5404 assert(status == 0, "invariant");
5405 const int s = _counter;
5406 _counter = 1;
5407 status = os::Solaris::mutex_unlock(_mutex);
5408 assert(status == 0, "invariant");
5409
5410 if (s < 1) {
5411 status = os::Solaris::cond_signal(_cond);
5412 assert(status == 0, "invariant");
5413 }
5414 }
5415
5416 extern char** environ;
5417
5418 // Run the specified command in a separate process. Return its exit value,
5419 // or -1 on failure (e.g. can't fork a new process).
5420 // Unlike system(), this function can be called from signal handler. It
5421 // doesn't block SIGINT et al.
5422 int os::fork_and_exec(char* cmd) {
5423 char * argv[4];
5424 argv[0] = (char *)"sh";
5425 argv[1] = (char *)"-c";
5426 argv[2] = cmd;
5427 argv[3] = NULL;
5428
5429 // fork is async-safe, fork1 is not so can't use in signal handler
5430 pid_t pid;
5431 Thread* t = Thread::current_or_null_safe();
5432 if (t != NULL && t->is_inside_signal_handler()) {
5433 pid = fork();
5434 } else {
5435 pid = fork1();
5436 }
5437
5438 if (pid < 0) {
5439 // fork failed
5440 warning("fork failed: %s", os::strerror(errno));
5441 return -1;
5442
5443 } else if (pid == 0) {
5444 // child process
5445
5446 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5447 execve("/usr/bin/sh", argv, environ);
5448
5449 // execve failed
5450 _exit(-1);
5451
5452 } else {
5453 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5454 // care about the actual exit code, for now.
5455
5456 int status;
5457
5458 // Wait for the child process to exit. This returns immediately if
5459 // the child has already exited. */
5460 while (waitpid(pid, &status, 0) < 0) {
5461 switch (errno) {
5462 case ECHILD: return 0;
5463 case EINTR: break;
5464 default: return -1;
5465 }
5466 }
5467
5468 if (WIFEXITED(status)) {
5469 // The child exited normally; get its exit code.
5470 return WEXITSTATUS(status);
5471 } else if (WIFSIGNALED(status)) {
5472 // The child exited because of a signal
5473 // The best value to return is 0x80 + signal number,
5474 // because that is what all Unix shells do, and because
5475 // it allows callers to distinguish between process exit and
5476 // process death by signal.
5477 return 0x80 + WTERMSIG(status);
5478 } else {
5479 // Unknown exit code; pass it through
5480 return status;
5481 }
5482 }
5483 }
5484
5485 // is_headless_jre()
5486 //
5487 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5488 // in order to report if we are running in a headless jre
5489 //
5490 // Since JDK8 xawt/libmawt.so was moved into the same directory
5491 // as libawt.so, and renamed libawt_xawt.so
5492 //
5493 bool os::is_headless_jre() {
5494 struct stat statbuf;
5495 char buf[MAXPATHLEN];
5496 char libmawtpath[MAXPATHLEN];
5497 const char *xawtstr = "/xawt/libmawt.so";
5498 const char *new_xawtstr = "/libawt_xawt.so";
5499 char *p;
5500
5501 // Get path to libjvm.so
5502 os::jvm_path(buf, sizeof(buf));
5503
5504 // Get rid of libjvm.so
5505 p = strrchr(buf, '/');
5506 if (p == NULL) {
5507 return false;
5508 } else {
5509 *p = '\0';
5510 }
5511
5512 // Get rid of client or server
5513 p = strrchr(buf, '/');
5514 if (p == NULL) {
5515 return false;
5516 } else {
5517 *p = '\0';
5518 }
5519
5520 // check xawt/libmawt.so
5521 strcpy(libmawtpath, buf);
5522 strcat(libmawtpath, xawtstr);
5523 if (::stat(libmawtpath, &statbuf) == 0) return false;
5524
5525 // check libawt_xawt.so
5526 strcpy(libmawtpath, buf);
5527 strcat(libmawtpath, new_xawtstr);
5528 if (::stat(libmawtpath, &statbuf) == 0) return false;
5529
5530 return true;
5531 }
5532
5533 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5534 size_t res;
5535 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5536 return res;
5537 }
5538
5539 int os::close(int fd) {
5540 return ::close(fd);
5541 }
5542
5543 int os::socket_close(int fd) {
5544 return ::close(fd);
5545 }
5546
5547 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5548 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5549 "Assumed _thread_in_native");
5550 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5551 }
5552
5553 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5554 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5555 "Assumed _thread_in_native");
5556 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5557 }
5558
5559 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5560 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5561 }
5562
5563 // As both poll and select can be interrupted by signals, we have to be
5564 // prepared to restart the system call after updating the timeout, unless
5565 // a poll() is done with timeout == -1, in which case we repeat with this
5566 // "wait forever" value.
5567
5568 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5569 int _result;
5570 _result = ::connect(fd, him, len);
5571
5572 // On Solaris, when a connect() call is interrupted, the connection
5573 // can be established asynchronously (see 6343810). Subsequent calls
5574 // to connect() must check the errno value which has the semantic
5575 // described below (copied from the connect() man page). Handling
5576 // of asynchronously established connections is required for both
5577 // blocking and non-blocking sockets.
5578 // EINTR The connection attempt was interrupted
5579 // before any data arrived by the delivery of
5580 // a signal. The connection, however, will be
5581 // established asynchronously.
5582 //
5583 // EINPROGRESS The socket is non-blocking, and the connec-
5584 // tion cannot be completed immediately.
5585 //
5586 // EALREADY The socket is non-blocking, and a previous
5587 // connection attempt has not yet been com-
5588 // pleted.
5589 //
5590 // EISCONN The socket is already connected.
5591 if (_result == OS_ERR && errno == EINTR) {
5592 // restarting a connect() changes its errno semantics
5593 RESTARTABLE(::connect(fd, him, len), _result);
5594 // undo these changes
5595 if (_result == OS_ERR) {
5596 if (errno == EALREADY) {
5597 errno = EINPROGRESS; // fall through
5598 } else if (errno == EISCONN) {
5599 errno = 0;
5600 return OS_OK;
5601 }
5602 }
5603 }
5604 return _result;
5605 }
5606
5607 // Get the default path to the core file
5608 // Returns the length of the string
5609 int os::get_core_path(char* buffer, size_t bufferSize) {
5610 const char* p = get_current_directory(buffer, bufferSize);
5611
5612 if (p == NULL) {
5613 assert(p != NULL, "failed to get current directory");
5614 return 0;
5615 }
5616
5617 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5618 p, current_process_id());
5619
5620 return strlen(buffer);
5621 }
5622
5623 #ifndef PRODUCT
5624 void TestReserveMemorySpecial_test() {
5625 // No tests available for this platform
5626 }
5627 #endif
5628
5629 bool os::start_debugging(char *buf, int buflen) {
5630 int len = (int)strlen(buf);
5631 char *p = &buf[len];
5632
5633 jio_snprintf(p, buflen-len,
5634 "\n\n"
5635 "Do you want to debug the problem?\n\n"
5636 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5637 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5638 "Otherwise, press RETURN to abort...",
5639 os::current_process_id(), os::current_thread_id());
5640
5641 bool yes = os::message_box("Unexpected Error", buf);
5642
5643 if (yes) {
5644 // yes, user asked VM to launch debugger
5645 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5646
5647 os::fork_and_exec(buf);
5648 yes = false;
5649 }
5650 return yes;
5651 }