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 // defined for >= Solaris 10. This allows builds on earlier versions
1017 // of Solaris to take advantage of the newly reserved Solaris JVM signals.
1018 // With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL
1019 // was SIGJVM1.
1020 //
1021 #if !defined(SIGJVM1)
1022 #define SIGJVM1 39
1023 #define SIGJVM2 40
1024 #endif
1025
1026 debug_only(static bool signal_sets_initialized = false);
1027 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1028
1029 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1030
1031 bool os::Solaris::is_sig_ignored(int sig) {
1032 struct sigaction oact;
1033 sigaction(sig, (struct sigaction*)NULL, &oact);
1034 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1035 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1036 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1037 return true;
1038 } else {
1039 return false;
1040 }
1041 }
1042
1043 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1044 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1045 static bool isJVM1available() {
1046 return SIGJVM1 < SIGRTMIN;
1047 }
1048
1049 void os::Solaris::signal_sets_init() {
1050 // Should also have an assertion stating we are still single-threaded.
1051 assert(!signal_sets_initialized, "Already initialized");
1052 // Fill in signals that are necessarily unblocked for all threads in
1053 // the VM. Currently, we unblock the following signals:
1054 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1055 // by -Xrs (=ReduceSignalUsage));
1056 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1057 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1058 // the dispositions or masks wrt these signals.
1059 // Programs embedding the VM that want to use the above signals for their
1060 // own purposes must, at this time, use the "-Xrs" option to prevent
1061 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1062 // (See bug 4345157, and other related bugs).
1063 // In reality, though, unblocking these signals is really a nop, since
1064 // these signals are not blocked by default.
1065 sigemptyset(&unblocked_sigs);
1066 sigemptyset(&allowdebug_blocked_sigs);
1067 sigaddset(&unblocked_sigs, SIGILL);
1068 sigaddset(&unblocked_sigs, SIGSEGV);
1069 sigaddset(&unblocked_sigs, SIGBUS);
1070 sigaddset(&unblocked_sigs, SIGFPE);
1071
1072 // Always true on Solaris 10+
1073 guarantee(isJVM1available(), "SIGJVM1/2 missing!");
1074 os::Solaris::set_SIGasync(SIGJVM2);
1075
1076 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1077
1078 if (!ReduceSignalUsage) {
1079 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1080 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1081 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1082 }
1083 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1084 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1085 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1086 }
1087 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1088 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1089 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1090 }
1091 }
1092 // Fill in signals that are blocked by all but the VM thread.
1093 sigemptyset(&vm_sigs);
1094 if (!ReduceSignalUsage) {
1095 sigaddset(&vm_sigs, BREAK_SIGNAL);
1096 }
1097 debug_only(signal_sets_initialized = true);
1098
1099 // For diagnostics only used in run_periodic_checks
1100 sigemptyset(&check_signal_done);
1101 }
1102
1103 // These are signals that are unblocked while a thread is running Java.
1104 // (For some reason, they get blocked by default.)
1105 sigset_t* os::Solaris::unblocked_signals() {
1106 assert(signal_sets_initialized, "Not initialized");
1107 return &unblocked_sigs;
1108 }
1109
1110 // These are the signals that are blocked while a (non-VM) thread is
1111 // running Java. Only the VM thread handles these signals.
1112 sigset_t* os::Solaris::vm_signals() {
1113 assert(signal_sets_initialized, "Not initialized");
1114 return &vm_sigs;
1115 }
1116
1117 // These are signals that are blocked during cond_wait to allow debugger in
1118 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1119 assert(signal_sets_initialized, "Not initialized");
1120 return &allowdebug_blocked_sigs;
1121 }
1122
1123
1124 void _handle_uncaught_cxx_exception() {
1125 VMError::report_and_die("An uncaught C++ exception");
1126 }
1127
1128
1129 // First crack at OS-specific initialization, from inside the new thread.
1130 void os::initialize_thread(Thread* thr) {
1131 int r = thr_main();
1132 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1133 if (r) {
1134 JavaThread* jt = (JavaThread *)thr;
1135 assert(jt != NULL, "Sanity check");
1136 size_t stack_size;
1137 address base = jt->stack_base();
1138 if (Arguments::created_by_java_launcher()) {
1139 // Use 2MB to allow for Solaris 7 64 bit mode.
1140 stack_size = JavaThread::stack_size_at_create() == 0
1141 ? 2048*K : JavaThread::stack_size_at_create();
1142
1143 // There are rare cases when we may have already used more than
1144 // the basic stack size allotment before this method is invoked.
1145 // Attempt to allow for a normally sized java_stack.
1146 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1147 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1148 } else {
1149 // 6269555: If we were not created by a Java launcher, i.e. if we are
1150 // running embedded in a native application, treat the primordial thread
1151 // as much like a native attached thread as possible. This means using
1152 // the current stack size from thr_stksegment(), unless it is too large
1153 // to reliably setup guard pages. A reasonable max size is 8MB.
1154 size_t current_size = current_stack_size();
1155 // This should never happen, but just in case....
1156 if (current_size == 0) current_size = 2 * K * K;
1157 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1158 }
1159 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1160 stack_size = (size_t)(base - bottom);
1161
1162 assert(stack_size > 0, "Stack size calculation problem");
1163
1164 if (stack_size > jt->stack_size()) {
1165 #ifndef PRODUCT
1166 struct rlimit limits;
1167 getrlimit(RLIMIT_STACK, &limits);
1168 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1169 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1170 #endif
1171 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1172 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1173 "See limit(1) to increase the stack size limit.",
1174 stack_size / K, jt->stack_size() / K);
1175 vm_exit(1);
1176 }
1177 assert(jt->stack_size() >= stack_size,
1178 "Attempt to map more stack than was allocated");
1179 jt->set_stack_size(stack_size);
1180 }
1181
1182 // With the T2 libthread (T1 is no longer supported) threads are always bound
1183 // and we use stackbanging in all cases.
1184
1185 os::Solaris::init_thread_fpu_state();
1186 std::set_terminate(_handle_uncaught_cxx_exception);
1187 }
1188
1189
1190
1191 // Free Solaris resources related to the OSThread
1192 void os::free_thread(OSThread* osthread) {
1193 assert(osthread != NULL, "os::free_thread but osthread not set");
1194
1195 // We are told to free resources of the argument thread,
1196 // but we can only really operate on the current thread.
1197 assert(Thread::current()->osthread() == osthread,
1198 "os::free_thread but not current thread");
1199
1200 // Restore caller's signal mask
1201 sigset_t sigmask = osthread->caller_sigmask();
1202 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1203
1204 delete osthread;
1205 }
1206
1207 void os::pd_start_thread(Thread* thread) {
1208 int status = thr_continue(thread->osthread()->thread_id());
1209 assert_status(status == 0, status, "thr_continue failed");
1210 }
1211
1212
1213 intx os::current_thread_id() {
1214 return (intx)thr_self();
1215 }
1216
1217 static pid_t _initial_pid = 0;
1218
1219 int os::current_process_id() {
1220 return (int)(_initial_pid ? _initial_pid : getpid());
1221 }
1222
1223 // gethrtime() should be monotonic according to the documentation,
1224 // but some virtualized platforms are known to break this guarantee.
1225 // getTimeNanos() must be guaranteed not to move backwards, so we
1226 // are forced to add a check here.
1227 inline hrtime_t getTimeNanos() {
1228 const hrtime_t now = gethrtime();
1229 const hrtime_t prev = max_hrtime;
1230 if (now <= prev) {
1231 return prev; // same or retrograde time;
1232 }
1233 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1234 assert(obsv >= prev, "invariant"); // Monotonicity
1235 // If the CAS succeeded then we're done and return "now".
1236 // If the CAS failed and the observed value "obsv" is >= now then
1237 // we should return "obsv". If the CAS failed and now > obsv > prv then
1238 // some other thread raced this thread and installed a new value, in which case
1239 // we could either (a) retry the entire operation, (b) retry trying to install now
1240 // or (c) just return obsv. We use (c). No loop is required although in some cases
1241 // we might discard a higher "now" value in deference to a slightly lower but freshly
1242 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1243 // to (a) or (b) -- and greatly reduces coherence traffic.
1244 // We might also condition (c) on the magnitude of the delta between obsv and now.
1245 // Avoiding excessive CAS operations to hot RW locations is critical.
1246 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1247 return (prev == obsv) ? now : obsv;
1248 }
1249
1250 // Time since start-up in seconds to a fine granularity.
1251 // Used by VMSelfDestructTimer and the MemProfiler.
1252 double os::elapsedTime() {
1253 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1254 }
1255
1256 jlong os::elapsed_counter() {
1257 return (jlong)(getTimeNanos() - first_hrtime);
1258 }
1259
1260 jlong os::elapsed_frequency() {
1261 return hrtime_hz;
1262 }
1263
1264 // Return the real, user, and system times in seconds from an
1265 // arbitrary fixed point in the past.
1266 bool os::getTimesSecs(double* process_real_time,
1267 double* process_user_time,
1268 double* process_system_time) {
1269 struct tms ticks;
1270 clock_t real_ticks = times(&ticks);
1271
1272 if (real_ticks == (clock_t) (-1)) {
1273 return false;
1274 } else {
1275 double ticks_per_second = (double) clock_tics_per_sec;
1276 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1277 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1278 // For consistency return the real time from getTimeNanos()
1279 // converted to seconds.
1280 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1281
1282 return true;
1283 }
1284 }
1285
1286 bool os::supports_vtime() { return true; }
1287 bool os::enable_vtime() { return false; }
1288 bool os::vtime_enabled() { return false; }
1289
1290 double os::elapsedVTime() {
1291 return (double)gethrvtime() / (double)hrtime_hz;
1292 }
1293
1294 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1295 jlong os::javaTimeMillis() {
1296 timeval t;
1297 if (gettimeofday(&t, NULL) == -1) {
1298 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1299 }
1300 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1301 }
1302
1303 // Must return seconds+nanos since Jan 1 1970. This must use the same
1304 // time source as javaTimeMillis and can't use get_nsec_fromepoch as
1305 // we need better than 1ms accuracy
1306 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1307 timeval t;
1308 if (gettimeofday(&t, NULL) == -1) {
1309 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1310 }
1311 seconds = jlong(t.tv_sec);
1312 nanos = jlong(t.tv_usec) * 1000;
1313 }
1314
1315
1316 jlong os::javaTimeNanos() {
1317 return (jlong)getTimeNanos();
1318 }
1319
1320 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1321 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1322 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1323 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1324 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1325 }
1326
1327 char * os::local_time_string(char *buf, size_t buflen) {
1328 struct tm t;
1329 time_t long_time;
1330 time(&long_time);
1331 localtime_r(&long_time, &t);
1332 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1333 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1334 t.tm_hour, t.tm_min, t.tm_sec);
1335 return buf;
1336 }
1337
1338 // Note: os::shutdown() might be called very early during initialization, or
1339 // called from signal handler. Before adding something to os::shutdown(), make
1340 // sure it is async-safe and can handle partially initialized VM.
1341 void os::shutdown() {
1342
1343 // allow PerfMemory to attempt cleanup of any persistent resources
1344 perfMemory_exit();
1345
1346 // needs to remove object in file system
1347 AttachListener::abort();
1348
1349 // flush buffered output, finish log files
1350 ostream_abort();
1351
1352 // Check for abort hook
1353 abort_hook_t abort_hook = Arguments::abort_hook();
1354 if (abort_hook != NULL) {
1355 abort_hook();
1356 }
1357 }
1358
1359 // Note: os::abort() might be called very early during initialization, or
1360 // called from signal handler. Before adding something to os::abort(), make
1361 // sure it is async-safe and can handle partially initialized VM.
1362 void os::abort(bool dump_core, void* siginfo, const void* context) {
1363 os::shutdown();
1364 if (dump_core) {
1365 #ifndef PRODUCT
1366 fdStream out(defaultStream::output_fd());
1367 out.print_raw("Current thread is ");
1368 char buf[16];
1369 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1370 out.print_raw_cr(buf);
1371 out.print_raw_cr("Dumping core ...");
1372 #endif
1373 ::abort(); // dump core (for debugging)
1374 }
1375
1376 ::exit(1);
1377 }
1378
1379 // Die immediately, no exit hook, no abort hook, no cleanup.
1380 void os::die() {
1381 ::abort(); // dump core (for debugging)
1382 }
1383
1384 // DLL functions
1385
1386 const char* os::dll_file_extension() { return ".so"; }
1387
1388 // This must be hard coded because it's the system's temporary
1389 // directory not the java application's temp directory, ala java.io.tmpdir.
1390 const char* os::get_temp_directory() { return "/tmp"; }
1391
1392 static bool file_exists(const char* filename) {
1393 struct stat statbuf;
1394 if (filename == NULL || strlen(filename) == 0) {
1395 return false;
1396 }
1397 return os::stat(filename, &statbuf) == 0;
1398 }
1399
1400 bool os::dll_build_name(char* buffer, size_t buflen,
1401 const char* pname, const char* fname) {
1402 bool retval = false;
1403 const size_t pnamelen = pname ? strlen(pname) : 0;
1404
1405 // Return error on buffer overflow.
1406 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1407 return retval;
1408 }
1409
1410 if (pnamelen == 0) {
1411 snprintf(buffer, buflen, "lib%s.so", fname);
1412 retval = true;
1413 } else if (strchr(pname, *os::path_separator()) != NULL) {
1414 int n;
1415 char** pelements = split_path(pname, &n);
1416 if (pelements == NULL) {
1417 return false;
1418 }
1419 for (int i = 0; i < n; i++) {
1420 // really shouldn't be NULL but what the heck, check can't hurt
1421 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1422 continue; // skip the empty path values
1423 }
1424 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1425 if (file_exists(buffer)) {
1426 retval = true;
1427 break;
1428 }
1429 }
1430 // release the storage
1431 for (int i = 0; i < n; i++) {
1432 if (pelements[i] != NULL) {
1433 FREE_C_HEAP_ARRAY(char, pelements[i]);
1434 }
1435 }
1436 if (pelements != NULL) {
1437 FREE_C_HEAP_ARRAY(char*, pelements);
1438 }
1439 } else {
1440 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1441 retval = true;
1442 }
1443 return retval;
1444 }
1445
1446 // check if addr is inside libjvm.so
1447 bool os::address_is_in_vm(address addr) {
1448 static address libjvm_base_addr;
1449 Dl_info dlinfo;
1450
1451 if (libjvm_base_addr == NULL) {
1452 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1453 libjvm_base_addr = (address)dlinfo.dli_fbase;
1454 }
1455 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1456 }
1457
1458 if (dladdr((void *)addr, &dlinfo) != 0) {
1459 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1460 }
1461
1462 return false;
1463 }
1464
1465 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1466 static dladdr1_func_type dladdr1_func = NULL;
1467
1468 bool os::dll_address_to_function_name(address addr, char *buf,
1469 int buflen, int * offset,
1470 bool demangle) {
1471 // buf is not optional, but offset is optional
1472 assert(buf != NULL, "sanity check");
1473
1474 Dl_info dlinfo;
1475
1476 // dladdr1_func was initialized in os::init()
1477 if (dladdr1_func != NULL) {
1478 // yes, we have dladdr1
1479
1480 // Support for dladdr1 is checked at runtime; it may be
1481 // available even if the vm is built on a machine that does
1482 // not have dladdr1 support. Make sure there is a value for
1483 // RTLD_DL_SYMENT.
1484 #ifndef RTLD_DL_SYMENT
1485 #define RTLD_DL_SYMENT 1
1486 #endif
1487 #ifdef _LP64
1488 Elf64_Sym * info;
1489 #else
1490 Elf32_Sym * info;
1491 #endif
1492 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1493 RTLD_DL_SYMENT) != 0) {
1494 // see if we have a matching symbol that covers our address
1495 if (dlinfo.dli_saddr != NULL &&
1496 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1497 if (dlinfo.dli_sname != NULL) {
1498 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1499 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1500 }
1501 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1502 return true;
1503 }
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 // no, only dladdr is available
1519 if (dladdr((void *)addr, &dlinfo) != 0) {
1520 // see if we have a matching symbol
1521 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1522 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1523 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1524 }
1525 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1526 return true;
1527 }
1528 // no matching symbol so try for just file info
1529 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1530 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1531 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1532 return true;
1533 }
1534 }
1535 }
1536 buf[0] = '\0';
1537 if (offset != NULL) *offset = -1;
1538 return false;
1539 }
1540
1541 bool os::dll_address_to_library_name(address addr, char* buf,
1542 int buflen, int* offset) {
1543 // buf is not optional, but offset is optional
1544 assert(buf != NULL, "sanity check");
1545
1546 Dl_info dlinfo;
1547
1548 if (dladdr((void*)addr, &dlinfo) != 0) {
1549 if (dlinfo.dli_fname != NULL) {
1550 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1551 }
1552 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1553 *offset = addr - (address)dlinfo.dli_fbase;
1554 }
1555 return true;
1556 }
1557
1558 buf[0] = '\0';
1559 if (offset) *offset = -1;
1560 return false;
1561 }
1562
1563 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1564 Dl_info dli;
1565 // Sanity check?
1566 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1567 dli.dli_fname == NULL) {
1568 return 1;
1569 }
1570
1571 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1572 if (handle == NULL) {
1573 return 1;
1574 }
1575
1576 Link_map *map;
1577 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1578 if (map == NULL) {
1579 dlclose(handle);
1580 return 1;
1581 }
1582
1583 while (map->l_prev != NULL) {
1584 map = map->l_prev;
1585 }
1586
1587 while (map != NULL) {
1588 // Iterate through all map entries and call callback with fields of interest
1589 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1590 dlclose(handle);
1591 return 1;
1592 }
1593 map = map->l_next;
1594 }
1595
1596 dlclose(handle);
1597 return 0;
1598 }
1599
1600 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1601 outputStream * out = (outputStream *) param;
1602 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1603 return 0;
1604 }
1605
1606 void os::print_dll_info(outputStream * st) {
1607 st->print_cr("Dynamic libraries:"); st->flush();
1608 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1609 st->print_cr("Error: Cannot print dynamic libraries.");
1610 }
1611 }
1612
1613 // Loads .dll/.so and
1614 // in case of error it checks if .dll/.so was built for the
1615 // same architecture as Hotspot is running on
1616
1617 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1618 void * result= ::dlopen(filename, RTLD_LAZY);
1619 if (result != NULL) {
1620 // Successful loading
1621 return result;
1622 }
1623
1624 Elf32_Ehdr elf_head;
1625
1626 // Read system error message into ebuf
1627 // It may or may not be overwritten below
1628 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1629 ebuf[ebuflen-1]='\0';
1630 int diag_msg_max_length=ebuflen-strlen(ebuf);
1631 char* diag_msg_buf=ebuf+strlen(ebuf);
1632
1633 if (diag_msg_max_length==0) {
1634 // No more space in ebuf for additional diagnostics message
1635 return NULL;
1636 }
1637
1638
1639 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1640
1641 if (file_descriptor < 0) {
1642 // Can't open library, report dlerror() message
1643 return NULL;
1644 }
1645
1646 bool failed_to_read_elf_head=
1647 (sizeof(elf_head)!=
1648 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1649
1650 ::close(file_descriptor);
1651 if (failed_to_read_elf_head) {
1652 // file i/o error - report dlerror() msg
1653 return NULL;
1654 }
1655
1656 typedef struct {
1657 Elf32_Half code; // Actual value as defined in elf.h
1658 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1659 char elf_class; // 32 or 64 bit
1660 char endianess; // MSB or LSB
1661 char* name; // String representation
1662 } arch_t;
1663
1664 static const arch_t arch_array[]={
1665 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1666 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1667 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1668 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1669 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1670 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1671 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1672 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1673 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1674 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1675 };
1676
1677 #if (defined IA32)
1678 static Elf32_Half running_arch_code=EM_386;
1679 #elif (defined AMD64)
1680 static Elf32_Half running_arch_code=EM_X86_64;
1681 #elif (defined IA64)
1682 static Elf32_Half running_arch_code=EM_IA_64;
1683 #elif (defined __sparc) && (defined _LP64)
1684 static Elf32_Half running_arch_code=EM_SPARCV9;
1685 #elif (defined __sparc) && (!defined _LP64)
1686 static Elf32_Half running_arch_code=EM_SPARC;
1687 #elif (defined __powerpc64__)
1688 static Elf32_Half running_arch_code=EM_PPC64;
1689 #elif (defined __powerpc__)
1690 static Elf32_Half running_arch_code=EM_PPC;
1691 #elif (defined ARM)
1692 static Elf32_Half running_arch_code=EM_ARM;
1693 #else
1694 #error Method os::dll_load requires that one of following is defined:\
1695 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1696 #endif
1697
1698 // Identify compatability class for VM's architecture and library's architecture
1699 // Obtain string descriptions for architectures
1700
1701 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1702 int running_arch_index=-1;
1703
1704 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1705 if (running_arch_code == arch_array[i].code) {
1706 running_arch_index = i;
1707 }
1708 if (lib_arch.code == arch_array[i].code) {
1709 lib_arch.compat_class = arch_array[i].compat_class;
1710 lib_arch.name = arch_array[i].name;
1711 }
1712 }
1713
1714 assert(running_arch_index != -1,
1715 "Didn't find running architecture code (running_arch_code) in arch_array");
1716 if (running_arch_index == -1) {
1717 // Even though running architecture detection failed
1718 // we may still continue with reporting dlerror() message
1719 return NULL;
1720 }
1721
1722 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1723 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1724 return NULL;
1725 }
1726
1727 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1728 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1729 return NULL;
1730 }
1731
1732 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1733 if (lib_arch.name!=NULL) {
1734 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1735 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1736 lib_arch.name, arch_array[running_arch_index].name);
1737 } else {
1738 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1739 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1740 lib_arch.code,
1741 arch_array[running_arch_index].name);
1742 }
1743 }
1744
1745 return NULL;
1746 }
1747
1748 void* os::dll_lookup(void* handle, const char* name) {
1749 return dlsym(handle, name);
1750 }
1751
1752 void* os::get_default_process_handle() {
1753 return (void*)::dlopen(NULL, RTLD_LAZY);
1754 }
1755
1756 int os::stat(const char *path, struct stat *sbuf) {
1757 char pathbuf[MAX_PATH];
1758 if (strlen(path) > MAX_PATH - 1) {
1759 errno = ENAMETOOLONG;
1760 return -1;
1761 }
1762 os::native_path(strcpy(pathbuf, path));
1763 return ::stat(pathbuf, sbuf);
1764 }
1765
1766 static inline time_t get_mtime(const char* filename) {
1767 struct stat st;
1768 int ret = os::stat(filename, &st);
1769 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1770 return st.st_mtime;
1771 }
1772
1773 int os::compare_file_modified_times(const char* file1, const char* file2) {
1774 time_t t1 = get_mtime(file1);
1775 time_t t2 = get_mtime(file2);
1776 return t1 - t2;
1777 }
1778
1779 static bool _print_ascii_file(const char* filename, outputStream* st) {
1780 int fd = ::open(filename, O_RDONLY);
1781 if (fd == -1) {
1782 return false;
1783 }
1784
1785 char buf[32];
1786 int bytes;
1787 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1788 st->print_raw(buf, bytes);
1789 }
1790
1791 ::close(fd);
1792
1793 return true;
1794 }
1795
1796 void os::print_os_info_brief(outputStream* st) {
1797 os::Solaris::print_distro_info(st);
1798
1799 os::Posix::print_uname_info(st);
1800
1801 os::Solaris::print_libversion_info(st);
1802 }
1803
1804 void os::print_os_info(outputStream* st) {
1805 st->print("OS:");
1806
1807 os::Solaris::print_distro_info(st);
1808
1809 os::Posix::print_uname_info(st);
1810
1811 os::Solaris::print_libversion_info(st);
1812
1813 os::Posix::print_rlimit_info(st);
1814
1815 os::Posix::print_load_average(st);
1816 }
1817
1818 void os::Solaris::print_distro_info(outputStream* st) {
1819 if (!_print_ascii_file("/etc/release", st)) {
1820 st->print("Solaris");
1821 }
1822 st->cr();
1823 }
1824
1825 void os::get_summary_os_info(char* buf, size_t buflen) {
1826 strncpy(buf, "Solaris", buflen); // default to plain solaris
1827 FILE* fp = fopen("/etc/release", "r");
1828 if (fp != NULL) {
1829 char tmp[256];
1830 // Only get the first line and chop out everything but the os name.
1831 if (fgets(tmp, sizeof(tmp), fp)) {
1832 char* ptr = tmp;
1833 // skip past whitespace characters
1834 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1835 if (*ptr != '\0') {
1836 char* nl = strchr(ptr, '\n');
1837 if (nl != NULL) *nl = '\0';
1838 strncpy(buf, ptr, buflen);
1839 }
1840 }
1841 fclose(fp);
1842 }
1843 }
1844
1845 void os::Solaris::print_libversion_info(outputStream* st) {
1846 st->print(" (T2 libthread)");
1847 st->cr();
1848 }
1849
1850 static bool check_addr0(outputStream* st) {
1851 jboolean status = false;
1852 const int read_chunk = 200;
1853 int ret = 0;
1854 int nmap = 0;
1855 int fd = ::open("/proc/self/map",O_RDONLY);
1856 if (fd >= 0) {
1857 prmap_t *p = NULL;
1858 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1859 if (NULL == mbuff) {
1860 ::close(fd);
1861 return status;
1862 }
1863 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1864 //check if read() has not read partial data
1865 if( 0 != ret % sizeof(prmap_t)){
1866 break;
1867 }
1868 nmap = ret / sizeof(prmap_t);
1869 p = (prmap_t *)mbuff;
1870 for(int i = 0; i < nmap; i++){
1871 if (p->pr_vaddr == 0x0) {
1872 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1873 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1874 st->print("Access: ");
1875 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1876 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1877 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1878 st->cr();
1879 status = true;
1880 }
1881 p++;
1882 }
1883 }
1884 free(mbuff);
1885 ::close(fd);
1886 }
1887 return status;
1888 }
1889
1890 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1891 // Get MHz with system call. We don't seem to already have this.
1892 processor_info_t stats;
1893 processorid_t id = getcpuid();
1894 int clock = 0;
1895 if (processor_info(id, &stats) != -1) {
1896 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1897 }
1898 #ifdef AMD64
1899 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1900 #else
1901 // must be sparc
1902 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1903 #endif
1904 }
1905
1906 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1907 // Nothing to do for now.
1908 }
1909
1910 void os::print_memory_info(outputStream* st) {
1911 st->print("Memory:");
1912 st->print(" %dk page", os::vm_page_size()>>10);
1913 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1914 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1915 st->cr();
1916 (void) check_addr0(st);
1917 }
1918
1919 // Moved from whole group, because we need them here for diagnostic
1920 // prints.
1921 #define OLDMAXSIGNUM 32
1922 static int Maxsignum = 0;
1923 static int *ourSigFlags = NULL;
1924
1925 int os::Solaris::get_our_sigflags(int sig) {
1926 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1927 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1928 return ourSigFlags[sig];
1929 }
1930
1931 void os::Solaris::set_our_sigflags(int sig, int flags) {
1932 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1933 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1934 ourSigFlags[sig] = flags;
1935 }
1936
1937
1938 static const char* get_signal_handler_name(address handler,
1939 char* buf, int buflen) {
1940 int offset;
1941 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
1942 if (found) {
1943 // skip directory names
1944 const char *p1, *p2;
1945 p1 = buf;
1946 size_t len = strlen(os::file_separator());
1947 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
1948 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
1949 } else {
1950 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
1951 }
1952 return buf;
1953 }
1954
1955 static void print_signal_handler(outputStream* st, int sig,
1956 char* buf, size_t buflen) {
1957 struct sigaction sa;
1958
1959 sigaction(sig, NULL, &sa);
1960
1961 st->print("%s: ", os::exception_name(sig, buf, buflen));
1962
1963 address handler = (sa.sa_flags & SA_SIGINFO)
1964 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1965 : CAST_FROM_FN_PTR(address, sa.sa_handler);
1966
1967 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
1968 st->print("SIG_DFL");
1969 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
1970 st->print("SIG_IGN");
1971 } else {
1972 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
1973 }
1974
1975 st->print(", sa_mask[0]=");
1976 os::Posix::print_signal_set_short(st, &sa.sa_mask);
1977
1978 address rh = VMError::get_resetted_sighandler(sig);
1979 // May be, handler was resetted by VMError?
1980 if (rh != NULL) {
1981 handler = rh;
1982 sa.sa_flags = VMError::get_resetted_sigflags(sig);
1983 }
1984
1985 st->print(", sa_flags=");
1986 os::Posix::print_sa_flags(st, sa.sa_flags);
1987
1988 // Check: is it our handler?
1989 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
1990 // It is our signal handler
1991 // check for flags
1992 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
1993 st->print(
1994 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
1995 os::Solaris::get_our_sigflags(sig));
1996 }
1997 }
1998 st->cr();
1999 }
2000
2001 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2002 st->print_cr("Signal Handlers:");
2003 print_signal_handler(st, SIGSEGV, buf, buflen);
2004 print_signal_handler(st, SIGBUS , buf, buflen);
2005 print_signal_handler(st, SIGFPE , buf, buflen);
2006 print_signal_handler(st, SIGPIPE, buf, buflen);
2007 print_signal_handler(st, SIGXFSZ, buf, buflen);
2008 print_signal_handler(st, SIGILL , buf, buflen);
2009 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2010 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2011 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2012 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2013 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2014 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2015 }
2016
2017 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2018
2019 // Find the full path to the current module, libjvm.so
2020 void os::jvm_path(char *buf, jint buflen) {
2021 // Error checking.
2022 if (buflen < MAXPATHLEN) {
2023 assert(false, "must use a large-enough buffer");
2024 buf[0] = '\0';
2025 return;
2026 }
2027 // Lazy resolve the path to current module.
2028 if (saved_jvm_path[0] != 0) {
2029 strcpy(buf, saved_jvm_path);
2030 return;
2031 }
2032
2033 Dl_info dlinfo;
2034 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2035 assert(ret != 0, "cannot locate libjvm");
2036 if (ret != 0 && dlinfo.dli_fname != NULL) {
2037 os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
2038 } else {
2039 buf[0] = '\0';
2040 return;
2041 }
2042
2043 if (Arguments::sun_java_launcher_is_altjvm()) {
2044 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2045 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2046 // If "/jre/lib/" appears at the right place in the string, then
2047 // assume we are installed in a JDK and we're done. Otherwise, check
2048 // for a JAVA_HOME environment variable and fix up the path so it
2049 // looks like libjvm.so is installed there (append a fake suffix
2050 // hotspot/libjvm.so).
2051 const char *p = buf + strlen(buf) - 1;
2052 for (int count = 0; p > buf && count < 5; ++count) {
2053 for (--p; p > buf && *p != '/'; --p)
2054 /* empty */ ;
2055 }
2056
2057 if (strncmp(p, "/jre/lib/", 9) != 0) {
2058 // Look for JAVA_HOME in the environment.
2059 char* java_home_var = ::getenv("JAVA_HOME");
2060 if (java_home_var != NULL && java_home_var[0] != 0) {
2061 char* jrelib_p;
2062 int len;
2063
2064 // Check the current module name "libjvm.so".
2065 p = strrchr(buf, '/');
2066 assert(strstr(p, "/libjvm") == p, "invalid library name");
2067
2068 os::Posix::realpath(java_home_var, buf, buflen);
2069 // determine if this is a legacy image or modules image
2070 // modules image doesn't have "jre" subdirectory
2071 len = strlen(buf);
2072 assert(len < buflen, "Ran out of buffer space");
2073 jrelib_p = buf + len;
2074 snprintf(jrelib_p, buflen-len, "/jre/lib");
2075 if (0 != access(buf, F_OK)) {
2076 snprintf(jrelib_p, buflen-len, "/lib");
2077 }
2078
2079 if (0 == access(buf, F_OK)) {
2080 // Use current module name "libjvm.so"
2081 len = strlen(buf);
2082 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2083 } else {
2084 // Go back to path of .so
2085 os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
2086 }
2087 }
2088 }
2089 }
2090
2091 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2092 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2093 }
2094
2095
2096 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2097 // no prefix required, not even "_"
2098 }
2099
2100
2101 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2102 // no suffix required
2103 }
2104
2105 // This method is a copy of JDK's sysGetLastErrorString
2106 // from src/solaris/hpi/src/system_md.c
2107
2108 size_t os::lasterror(char *buf, size_t len) {
2109 if (errno == 0) return 0;
2110
2111 const char *s = os::strerror(errno);
2112 size_t n = ::strlen(s);
2113 if (n >= len) {
2114 n = len - 1;
2115 }
2116 ::strncpy(buf, s, n);
2117 buf[n] = '\0';
2118 return n;
2119 }
2120
2121
2122 // sun.misc.Signal
2123
2124 extern "C" {
2125 static void UserHandler(int sig, void *siginfo, void *context) {
2126 // Ctrl-C is pressed during error reporting, likely because the error
2127 // handler fails to abort. Let VM die immediately.
2128 if (sig == SIGINT && is_error_reported()) {
2129 os::die();
2130 }
2131
2132 os::signal_notify(sig);
2133 // We do not need to reinstate the signal handler each time...
2134 }
2135 }
2136
2137 void* os::user_handler() {
2138 return CAST_FROM_FN_PTR(void*, UserHandler);
2139 }
2140
2141 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2142 struct timespec ts;
2143 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2144
2145 return ts;
2146 }
2147
2148 extern "C" {
2149 typedef void (*sa_handler_t)(int);
2150 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2151 }
2152
2153 void* os::signal(int signal_number, void* handler) {
2154 struct sigaction sigAct, oldSigAct;
2155 sigfillset(&(sigAct.sa_mask));
2156 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2157 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2158
2159 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2160 // -1 means registration failed
2161 return (void *)-1;
2162 }
2163
2164 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2165 }
2166
2167 void os::signal_raise(int signal_number) {
2168 raise(signal_number);
2169 }
2170
2171 // The following code is moved from os.cpp for making this
2172 // code platform specific, which it is by its very nature.
2173
2174 // a counter for each possible signal value
2175 static int Sigexit = 0;
2176 static int Maxlibjsigsigs;
2177 static jint *pending_signals = NULL;
2178 static int *preinstalled_sigs = NULL;
2179 static struct sigaction *chainedsigactions = NULL;
2180 static sema_t sig_sem;
2181 typedef int (*version_getting_t)();
2182 version_getting_t os::Solaris::get_libjsig_version = NULL;
2183 static int libjsigversion = NULL;
2184
2185 int os::sigexitnum_pd() {
2186 assert(Sigexit > 0, "signal memory not yet initialized");
2187 return Sigexit;
2188 }
2189
2190 void os::Solaris::init_signal_mem() {
2191 // Initialize signal structures
2192 Maxsignum = SIGRTMAX;
2193 Sigexit = Maxsignum+1;
2194 assert(Maxsignum >0, "Unable to obtain max signal number");
2195
2196 Maxlibjsigsigs = Maxsignum;
2197
2198 // pending_signals has one int per signal
2199 // The additional signal is for SIGEXIT - exit signal to signal_thread
2200 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2201 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2202
2203 if (UseSignalChaining) {
2204 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2205 * (Maxsignum + 1), mtInternal);
2206 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2207 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2208 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2209 }
2210 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2211 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2212 }
2213
2214 void os::signal_init_pd() {
2215 int ret;
2216
2217 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2218 assert(ret == 0, "sema_init() failed");
2219 }
2220
2221 void os::signal_notify(int signal_number) {
2222 int ret;
2223
2224 Atomic::inc(&pending_signals[signal_number]);
2225 ret = ::sema_post(&sig_sem);
2226 assert(ret == 0, "sema_post() failed");
2227 }
2228
2229 static int check_pending_signals(bool wait_for_signal) {
2230 int ret;
2231 while (true) {
2232 for (int i = 0; i < Sigexit + 1; i++) {
2233 jint n = pending_signals[i];
2234 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2235 return i;
2236 }
2237 }
2238 if (!wait_for_signal) {
2239 return -1;
2240 }
2241 JavaThread *thread = JavaThread::current();
2242 ThreadBlockInVM tbivm(thread);
2243
2244 bool threadIsSuspended;
2245 do {
2246 thread->set_suspend_equivalent();
2247 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2248 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2249 ;
2250 assert(ret == 0, "sema_wait() failed");
2251
2252 // were we externally suspended while we were waiting?
2253 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2254 if (threadIsSuspended) {
2255 // The semaphore has been incremented, but while we were waiting
2256 // another thread suspended us. We don't want to continue running
2257 // while suspended because that would surprise the thread that
2258 // suspended us.
2259 ret = ::sema_post(&sig_sem);
2260 assert(ret == 0, "sema_post() failed");
2261
2262 thread->java_suspend_self();
2263 }
2264 } while (threadIsSuspended);
2265 }
2266 }
2267
2268 int os::signal_lookup() {
2269 return check_pending_signals(false);
2270 }
2271
2272 int os::signal_wait() {
2273 return check_pending_signals(true);
2274 }
2275
2276 ////////////////////////////////////////////////////////////////////////////////
2277 // Virtual Memory
2278
2279 static int page_size = -1;
2280
2281 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2282 // clear this var if support is not available.
2283 static bool has_map_align = true;
2284
2285 int os::vm_page_size() {
2286 assert(page_size != -1, "must call os::init");
2287 return page_size;
2288 }
2289
2290 // Solaris allocates memory by pages.
2291 int os::vm_allocation_granularity() {
2292 assert(page_size != -1, "must call os::init");
2293 return page_size;
2294 }
2295
2296 static bool recoverable_mmap_error(int err) {
2297 // See if the error is one we can let the caller handle. This
2298 // list of errno values comes from the Solaris mmap(2) man page.
2299 switch (err) {
2300 case EBADF:
2301 case EINVAL:
2302 case ENOTSUP:
2303 // let the caller deal with these errors
2304 return true;
2305
2306 default:
2307 // Any remaining errors on this OS can cause our reserved mapping
2308 // to be lost. That can cause confusion where different data
2309 // structures think they have the same memory mapped. The worst
2310 // scenario is if both the VM and a library think they have the
2311 // same memory mapped.
2312 return false;
2313 }
2314 }
2315
2316 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2317 int err) {
2318 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2319 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2320 os::strerror(err), err);
2321 }
2322
2323 static void warn_fail_commit_memory(char* addr, size_t bytes,
2324 size_t alignment_hint, bool exec,
2325 int err) {
2326 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2327 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2328 alignment_hint, exec, os::strerror(err), err);
2329 }
2330
2331 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2332 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2333 size_t size = bytes;
2334 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2335 if (res != NULL) {
2336 if (UseNUMAInterleaving) {
2337 numa_make_global(addr, bytes);
2338 }
2339 return 0;
2340 }
2341
2342 int err = errno; // save errno from mmap() call in mmap_chunk()
2343
2344 if (!recoverable_mmap_error(err)) {
2345 warn_fail_commit_memory(addr, bytes, exec, err);
2346 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2347 }
2348
2349 return err;
2350 }
2351
2352 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2353 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2354 }
2355
2356 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2357 const char* mesg) {
2358 assert(mesg != NULL, "mesg must be specified");
2359 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2360 if (err != 0) {
2361 // the caller wants all commit errors to exit with the specified mesg:
2362 warn_fail_commit_memory(addr, bytes, exec, err);
2363 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2364 }
2365 }
2366
2367 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2368 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2369 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2370 alignment, (size_t) vm_page_size());
2371
2372 for (int i = 0; _page_sizes[i] != 0; i++) {
2373 if (is_size_aligned(alignment, _page_sizes[i])) {
2374 return _page_sizes[i];
2375 }
2376 }
2377
2378 return (size_t) vm_page_size();
2379 }
2380
2381 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2382 size_t alignment_hint, bool exec) {
2383 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2384 if (err == 0 && UseLargePages && alignment_hint > 0) {
2385 assert(is_size_aligned(bytes, alignment_hint),
2386 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2387
2388 // The syscall memcntl requires an exact page size (see man memcntl for details).
2389 size_t page_size = page_size_for_alignment(alignment_hint);
2390 if (page_size > (size_t) vm_page_size()) {
2391 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2392 }
2393 }
2394 return err;
2395 }
2396
2397 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2398 bool exec) {
2399 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2400 }
2401
2402 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2403 size_t alignment_hint, bool exec,
2404 const char* mesg) {
2405 assert(mesg != NULL, "mesg must be specified");
2406 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2407 if (err != 0) {
2408 // the caller wants all commit errors to exit with the specified mesg:
2409 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2410 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2411 }
2412 }
2413
2414 // Uncommit the pages in a specified region.
2415 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2416 if (madvise(addr, bytes, MADV_FREE) < 0) {
2417 debug_only(warning("MADV_FREE failed."));
2418 return;
2419 }
2420 }
2421
2422 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2423 return os::commit_memory(addr, size, !ExecMem);
2424 }
2425
2426 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2427 return os::uncommit_memory(addr, size);
2428 }
2429
2430 // Change the page size in a given range.
2431 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2432 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2433 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2434 if (UseLargePages) {
2435 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2436 if (page_size > (size_t) vm_page_size()) {
2437 Solaris::setup_large_pages(addr, bytes, page_size);
2438 }
2439 }
2440 }
2441
2442 // Tell the OS to make the range local to the first-touching LWP
2443 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2444 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2445 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2446 debug_only(warning("MADV_ACCESS_LWP failed."));
2447 }
2448 }
2449
2450 // Tell the OS that this range would be accessed from different LWPs.
2451 void os::numa_make_global(char *addr, size_t bytes) {
2452 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2453 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2454 debug_only(warning("MADV_ACCESS_MANY failed."));
2455 }
2456 }
2457
2458 // Get the number of the locality groups.
2459 size_t os::numa_get_groups_num() {
2460 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2461 return n != -1 ? n : 1;
2462 }
2463
2464 // Get a list of leaf locality groups. A leaf lgroup is group that
2465 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2466 // board. An LWP is assigned to one of these groups upon creation.
2467 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2468 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2469 ids[0] = 0;
2470 return 1;
2471 }
2472 int result_size = 0, top = 1, bottom = 0, cur = 0;
2473 for (int k = 0; k < size; k++) {
2474 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2475 (Solaris::lgrp_id_t*)&ids[top], size - top);
2476 if (r == -1) {
2477 ids[0] = 0;
2478 return 1;
2479 }
2480 if (!r) {
2481 // That's a leaf node.
2482 assert(bottom <= cur, "Sanity check");
2483 // Check if the node has memory
2484 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2485 NULL, 0, LGRP_RSRC_MEM) > 0) {
2486 ids[bottom++] = ids[cur];
2487 }
2488 }
2489 top += r;
2490 cur++;
2491 }
2492 if (bottom == 0) {
2493 // Handle a situation, when the OS reports no memory available.
2494 // Assume UMA architecture.
2495 ids[0] = 0;
2496 return 1;
2497 }
2498 return bottom;
2499 }
2500
2501 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2502 bool os::numa_topology_changed() {
2503 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2504 if (is_stale != -1 && is_stale) {
2505 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2506 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2507 assert(c != 0, "Failure to initialize LGRP API");
2508 Solaris::set_lgrp_cookie(c);
2509 return true;
2510 }
2511 return false;
2512 }
2513
2514 // Get the group id of the current LWP.
2515 int os::numa_get_group_id() {
2516 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2517 if (lgrp_id == -1) {
2518 return 0;
2519 }
2520 const int size = os::numa_get_groups_num();
2521 int *ids = (int*)alloca(size * sizeof(int));
2522
2523 // Get the ids of all lgroups with memory; r is the count.
2524 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2525 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2526 if (r <= 0) {
2527 return 0;
2528 }
2529 return ids[os::random() % r];
2530 }
2531
2532 // Request information about the page.
2533 bool os::get_page_info(char *start, page_info* info) {
2534 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2535 uint64_t addr = (uintptr_t)start;
2536 uint64_t outdata[2];
2537 uint_t validity = 0;
2538
2539 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2540 return false;
2541 }
2542
2543 info->size = 0;
2544 info->lgrp_id = -1;
2545
2546 if ((validity & 1) != 0) {
2547 if ((validity & 2) != 0) {
2548 info->lgrp_id = outdata[0];
2549 }
2550 if ((validity & 4) != 0) {
2551 info->size = outdata[1];
2552 }
2553 return true;
2554 }
2555 return false;
2556 }
2557
2558 // Scan the pages from start to end until a page different than
2559 // the one described in the info parameter is encountered.
2560 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2561 page_info* page_found) {
2562 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2563 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2564 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2565 uint_t validity[MAX_MEMINFO_CNT];
2566
2567 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2568 uint64_t p = (uint64_t)start;
2569 while (p < (uint64_t)end) {
2570 addrs[0] = p;
2571 size_t addrs_count = 1;
2572 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2573 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2574 addrs_count++;
2575 }
2576
2577 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2578 return NULL;
2579 }
2580
2581 size_t i = 0;
2582 for (; i < addrs_count; i++) {
2583 if ((validity[i] & 1) != 0) {
2584 if ((validity[i] & 4) != 0) {
2585 if (outdata[types * i + 1] != page_expected->size) {
2586 break;
2587 }
2588 } else if (page_expected->size != 0) {
2589 break;
2590 }
2591
2592 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2593 if (outdata[types * i] != page_expected->lgrp_id) {
2594 break;
2595 }
2596 }
2597 } else {
2598 return NULL;
2599 }
2600 }
2601
2602 if (i < addrs_count) {
2603 if ((validity[i] & 2) != 0) {
2604 page_found->lgrp_id = outdata[types * i];
2605 } else {
2606 page_found->lgrp_id = -1;
2607 }
2608 if ((validity[i] & 4) != 0) {
2609 page_found->size = outdata[types * i + 1];
2610 } else {
2611 page_found->size = 0;
2612 }
2613 return (char*)addrs[i];
2614 }
2615
2616 p = addrs[addrs_count - 1] + page_size;
2617 }
2618 return end;
2619 }
2620
2621 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2622 size_t size = bytes;
2623 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2624 // uncommitted page. Otherwise, the read/write might succeed if we
2625 // have enough swap space to back the physical page.
2626 return
2627 NULL != Solaris::mmap_chunk(addr, size,
2628 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2629 PROT_NONE);
2630 }
2631
2632 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2633 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2634
2635 if (b == MAP_FAILED) {
2636 return NULL;
2637 }
2638 return b;
2639 }
2640
2641 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2642 size_t alignment_hint, bool fixed) {
2643 char* addr = requested_addr;
2644 int flags = MAP_PRIVATE | MAP_NORESERVE;
2645
2646 assert(!(fixed && (alignment_hint > 0)),
2647 "alignment hint meaningless with fixed mmap");
2648
2649 if (fixed) {
2650 flags |= MAP_FIXED;
2651 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2652 flags |= MAP_ALIGN;
2653 addr = (char*) alignment_hint;
2654 }
2655
2656 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2657 // uncommitted page. Otherwise, the read/write might succeed if we
2658 // have enough swap space to back the physical page.
2659 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2660 }
2661
2662 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2663 size_t alignment_hint) {
2664 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2665 (requested_addr != NULL));
2666
2667 guarantee(requested_addr == NULL || requested_addr == addr,
2668 "OS failed to return requested mmap address.");
2669 return addr;
2670 }
2671
2672 // Reserve memory at an arbitrary address, only if that area is
2673 // available (and not reserved for something else).
2674
2675 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2676 const int max_tries = 10;
2677 char* base[max_tries];
2678 size_t size[max_tries];
2679
2680 // Solaris adds a gap between mmap'ed regions. The size of the gap
2681 // is dependent on the requested size and the MMU. Our initial gap
2682 // value here is just a guess and will be corrected later.
2683 bool had_top_overlap = false;
2684 bool have_adjusted_gap = false;
2685 size_t gap = 0x400000;
2686
2687 // Assert only that the size is a multiple of the page size, since
2688 // that's all that mmap requires, and since that's all we really know
2689 // about at this low abstraction level. If we need higher alignment,
2690 // we can either pass an alignment to this method or verify alignment
2691 // in one of the methods further up the call chain. See bug 5044738.
2692 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2693
2694 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2695 // Give it a try, if the kernel honors the hint we can return immediately.
2696 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2697
2698 volatile int err = errno;
2699 if (addr == requested_addr) {
2700 return addr;
2701 } else if (addr != NULL) {
2702 pd_unmap_memory(addr, bytes);
2703 }
2704
2705 if (log_is_enabled(Warning, os)) {
2706 char buf[256];
2707 buf[0] = '\0';
2708 if (addr == NULL) {
2709 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2710 }
2711 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2712 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2713 "%s", bytes, requested_addr, addr, buf);
2714 }
2715
2716 // Address hint method didn't work. Fall back to the old method.
2717 // In theory, once SNV becomes our oldest supported platform, this
2718 // code will no longer be needed.
2719 //
2720 // Repeatedly allocate blocks until the block is allocated at the
2721 // right spot. Give up after max_tries.
2722 int i;
2723 for (i = 0; i < max_tries; ++i) {
2724 base[i] = reserve_memory(bytes);
2725
2726 if (base[i] != NULL) {
2727 // Is this the block we wanted?
2728 if (base[i] == requested_addr) {
2729 size[i] = bytes;
2730 break;
2731 }
2732
2733 // check that the gap value is right
2734 if (had_top_overlap && !have_adjusted_gap) {
2735 size_t actual_gap = base[i-1] - base[i] - bytes;
2736 if (gap != actual_gap) {
2737 // adjust the gap value and retry the last 2 allocations
2738 assert(i > 0, "gap adjustment code problem");
2739 have_adjusted_gap = true; // adjust the gap only once, just in case
2740 gap = actual_gap;
2741 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2742 unmap_memory(base[i], bytes);
2743 unmap_memory(base[i-1], size[i-1]);
2744 i-=2;
2745 continue;
2746 }
2747 }
2748
2749 // Does this overlap the block we wanted? Give back the overlapped
2750 // parts and try again.
2751 //
2752 // There is still a bug in this code: if top_overlap == bytes,
2753 // the overlap is offset from requested region by the value of gap.
2754 // In this case giving back the overlapped part will not work,
2755 // because we'll give back the entire block at base[i] and
2756 // therefore the subsequent allocation will not generate a new gap.
2757 // This could be fixed with a new algorithm that used larger
2758 // or variable size chunks to find the requested region -
2759 // but such a change would introduce additional complications.
2760 // It's rare enough that the planets align for this bug,
2761 // so we'll just wait for a fix for 6204603/5003415 which
2762 // will provide a mmap flag to allow us to avoid this business.
2763
2764 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2765 if (top_overlap >= 0 && top_overlap < bytes) {
2766 had_top_overlap = true;
2767 unmap_memory(base[i], top_overlap);
2768 base[i] += top_overlap;
2769 size[i] = bytes - top_overlap;
2770 } else {
2771 size_t bottom_overlap = base[i] + bytes - requested_addr;
2772 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2773 if (bottom_overlap == 0) {
2774 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2775 }
2776 unmap_memory(requested_addr, bottom_overlap);
2777 size[i] = bytes - bottom_overlap;
2778 } else {
2779 size[i] = bytes;
2780 }
2781 }
2782 }
2783 }
2784
2785 // Give back the unused reserved pieces.
2786
2787 for (int j = 0; j < i; ++j) {
2788 if (base[j] != NULL) {
2789 unmap_memory(base[j], size[j]);
2790 }
2791 }
2792
2793 return (i < max_tries) ? requested_addr : NULL;
2794 }
2795
2796 bool os::pd_release_memory(char* addr, size_t bytes) {
2797 size_t size = bytes;
2798 return munmap(addr, size) == 0;
2799 }
2800
2801 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2802 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2803 "addr must be page aligned");
2804 int retVal = mprotect(addr, bytes, prot);
2805 return retVal == 0;
2806 }
2807
2808 // Protect memory (Used to pass readonly pages through
2809 // JNI GetArray<type>Elements with empty arrays.)
2810 // Also, used for serialization page and for compressed oops null pointer
2811 // checking.
2812 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2813 bool is_committed) {
2814 unsigned int p = 0;
2815 switch (prot) {
2816 case MEM_PROT_NONE: p = PROT_NONE; break;
2817 case MEM_PROT_READ: p = PROT_READ; break;
2818 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2819 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2820 default:
2821 ShouldNotReachHere();
2822 }
2823 // is_committed is unused.
2824 return solaris_mprotect(addr, bytes, p);
2825 }
2826
2827 // guard_memory and unguard_memory only happens within stack guard pages.
2828 // Since ISM pertains only to the heap, guard and unguard memory should not
2829 /// happen with an ISM region.
2830 bool os::guard_memory(char* addr, size_t bytes) {
2831 return solaris_mprotect(addr, bytes, PROT_NONE);
2832 }
2833
2834 bool os::unguard_memory(char* addr, size_t bytes) {
2835 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2836 }
2837
2838 // Large page support
2839 static size_t _large_page_size = 0;
2840
2841 // Insertion sort for small arrays (descending order).
2842 static void insertion_sort_descending(size_t* array, int len) {
2843 for (int i = 0; i < len; i++) {
2844 size_t val = array[i];
2845 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2846 size_t tmp = array[key];
2847 array[key] = array[key - 1];
2848 array[key - 1] = tmp;
2849 }
2850 }
2851 }
2852
2853 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2854 const unsigned int usable_count = VM_Version::page_size_count();
2855 if (usable_count == 1) {
2856 return false;
2857 }
2858
2859 // Find the right getpagesizes interface. When solaris 11 is the minimum
2860 // build platform, getpagesizes() (without the '2') can be called directly.
2861 typedef int (*gps_t)(size_t[], int);
2862 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2863 if (gps_func == NULL) {
2864 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2865 if (gps_func == NULL) {
2866 if (warn) {
2867 warning("MPSS is not supported by the operating system.");
2868 }
2869 return false;
2870 }
2871 }
2872
2873 // Fill the array of page sizes.
2874 int n = (*gps_func)(_page_sizes, page_sizes_max);
2875 assert(n > 0, "Solaris bug?");
2876
2877 if (n == page_sizes_max) {
2878 // Add a sentinel value (necessary only if the array was completely filled
2879 // since it is static (zeroed at initialization)).
2880 _page_sizes[--n] = 0;
2881 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2882 }
2883 assert(_page_sizes[n] == 0, "missing sentinel");
2884 trace_page_sizes("available page sizes", _page_sizes, n);
2885
2886 if (n == 1) return false; // Only one page size available.
2887
2888 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2889 // select up to usable_count elements. First sort the array, find the first
2890 // acceptable value, then copy the usable sizes to the top of the array and
2891 // trim the rest. Make sure to include the default page size :-).
2892 //
2893 // A better policy could get rid of the 4M limit by taking the sizes of the
2894 // important VM memory regions (java heap and possibly the code cache) into
2895 // account.
2896 insertion_sort_descending(_page_sizes, n);
2897 const size_t size_limit =
2898 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2899 int beg;
2900 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2901 const int end = MIN2((int)usable_count, n) - 1;
2902 for (int cur = 0; cur < end; ++cur, ++beg) {
2903 _page_sizes[cur] = _page_sizes[beg];
2904 }
2905 _page_sizes[end] = vm_page_size();
2906 _page_sizes[end + 1] = 0;
2907
2908 if (_page_sizes[end] > _page_sizes[end - 1]) {
2909 // Default page size is not the smallest; sort again.
2910 insertion_sort_descending(_page_sizes, end + 1);
2911 }
2912 *page_size = _page_sizes[0];
2913
2914 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2915 return true;
2916 }
2917
2918 void os::large_page_init() {
2919 if (UseLargePages) {
2920 // print a warning if any large page related flag is specified on command line
2921 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2922 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2923
2924 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2925 }
2926 }
2927
2928 bool os::Solaris::is_valid_page_size(size_t bytes) {
2929 for (int i = 0; _page_sizes[i] != 0; i++) {
2930 if (_page_sizes[i] == bytes) {
2931 return true;
2932 }
2933 }
2934 return false;
2935 }
2936
2937 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2938 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2939 assert(is_ptr_aligned((void*) start, align),
2940 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2941 assert(is_size_aligned(bytes, align),
2942 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2943
2944 // Signal to OS that we want large pages for addresses
2945 // from addr, addr + bytes
2946 struct memcntl_mha mpss_struct;
2947 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2948 mpss_struct.mha_pagesize = align;
2949 mpss_struct.mha_flags = 0;
2950 // Upon successful completion, memcntl() returns 0
2951 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2952 debug_only(warning("Attempt to use MPSS failed."));
2953 return false;
2954 }
2955 return true;
2956 }
2957
2958 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2959 fatal("os::reserve_memory_special should not be called on Solaris.");
2960 return NULL;
2961 }
2962
2963 bool os::release_memory_special(char* base, size_t bytes) {
2964 fatal("os::release_memory_special should not be called on Solaris.");
2965 return false;
2966 }
2967
2968 size_t os::large_page_size() {
2969 return _large_page_size;
2970 }
2971
2972 // MPSS allows application to commit large page memory on demand; with ISM
2973 // the entire memory region must be allocated as shared memory.
2974 bool os::can_commit_large_page_memory() {
2975 return true;
2976 }
2977
2978 bool os::can_execute_large_page_memory() {
2979 return true;
2980 }
2981
2982 // Read calls from inside the vm need to perform state transitions
2983 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2984 size_t res;
2985 JavaThread* thread = (JavaThread*)Thread::current();
2986 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2987 ThreadBlockInVM tbiv(thread);
2988 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2989 return res;
2990 }
2991
2992 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2993 size_t res;
2994 JavaThread* thread = (JavaThread*)Thread::current();
2995 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2996 ThreadBlockInVM tbiv(thread);
2997 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
2998 return res;
2999 }
3000
3001 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3002 size_t res;
3003 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3004 "Assumed _thread_in_native");
3005 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3006 return res;
3007 }
3008
3009 void os::naked_short_sleep(jlong ms) {
3010 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3011
3012 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3013 // Solaris requires -lrt for this.
3014 usleep((ms * 1000));
3015
3016 return;
3017 }
3018
3019 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3020 void os::infinite_sleep() {
3021 while (true) { // sleep forever ...
3022 ::sleep(100); // ... 100 seconds at a time
3023 }
3024 }
3025
3026 // Used to convert frequent JVM_Yield() to nops
3027 bool os::dont_yield() {
3028 if (DontYieldALot) {
3029 static hrtime_t last_time = 0;
3030 hrtime_t diff = getTimeNanos() - last_time;
3031
3032 if (diff < DontYieldALotInterval * 1000000) {
3033 return true;
3034 }
3035
3036 last_time += diff;
3037
3038 return false;
3039 } else {
3040 return false;
3041 }
3042 }
3043
3044 // Note that yield semantics are defined by the scheduling class to which
3045 // the thread currently belongs. Typically, yield will _not yield to
3046 // other equal or higher priority threads that reside on the dispatch queues
3047 // of other CPUs.
3048
3049 void os::naked_yield() {
3050 thr_yield();
3051 }
3052
3053 // Interface for setting lwp priorities. We are using T2 libthread,
3054 // which forces the use of bound threads, so all of our threads will
3055 // be assigned to real lwp's. Using the thr_setprio function is
3056 // meaningless in this mode so we must adjust the real lwp's priority.
3057 // The routines below implement the getting and setting of lwp priorities.
3058 //
3059 // Note: There are three priority scales used on Solaris. Java priotities
3060 // which range from 1 to 10, libthread "thr_setprio" scale which range
3061 // from 0 to 127, and the current scheduling class of the process we
3062 // are running in. This is typically from -60 to +60.
3063 // The setting of the lwp priorities in done after a call to thr_setprio
3064 // so Java priorities are mapped to libthread priorities and we map from
3065 // the latter to lwp priorities. We don't keep priorities stored in
3066 // Java priorities since some of our worker threads want to set priorities
3067 // higher than all Java threads.
3068 //
3069 // For related information:
3070 // (1) man -s 2 priocntl
3071 // (2) man -s 4 priocntl
3072 // (3) man dispadmin
3073 // = librt.so
3074 // = libthread/common/rtsched.c - thrp_setlwpprio().
3075 // = ps -cL <pid> ... to validate priority.
3076 // = sched_get_priority_min and _max
3077 // pthread_create
3078 // sched_setparam
3079 // pthread_setschedparam
3080 //
3081 // Assumptions:
3082 // + We assume that all threads in the process belong to the same
3083 // scheduling class. IE. an homogenous process.
3084 // + Must be root or in IA group to change change "interactive" attribute.
3085 // Priocntl() will fail silently. The only indication of failure is when
3086 // we read-back the value and notice that it hasn't changed.
3087 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3088 // + For RT, change timeslice as well. Invariant:
3089 // constant "priority integral"
3090 // Konst == TimeSlice * (60-Priority)
3091 // Given a priority, compute appropriate timeslice.
3092 // + Higher numerical values have higher priority.
3093
3094 // sched class attributes
3095 typedef struct {
3096 int schedPolicy; // classID
3097 int maxPrio;
3098 int minPrio;
3099 } SchedInfo;
3100
3101
3102 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3103
3104 #ifdef ASSERT
3105 static int ReadBackValidate = 1;
3106 #endif
3107 static int myClass = 0;
3108 static int myMin = 0;
3109 static int myMax = 0;
3110 static int myCur = 0;
3111 static bool priocntl_enable = false;
3112
3113 static const int criticalPrio = FXCriticalPriority;
3114 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3115
3116
3117 // lwp_priocntl_init
3118 //
3119 // Try to determine the priority scale for our process.
3120 //
3121 // Return errno or 0 if OK.
3122 //
3123 static int lwp_priocntl_init() {
3124 int rslt;
3125 pcinfo_t ClassInfo;
3126 pcparms_t ParmInfo;
3127 int i;
3128
3129 if (!UseThreadPriorities) return 0;
3130
3131 // If ThreadPriorityPolicy is 1, switch tables
3132 if (ThreadPriorityPolicy == 1) {
3133 for (i = 0; i < CriticalPriority+1; i++)
3134 os::java_to_os_priority[i] = prio_policy1[i];
3135 }
3136 if (UseCriticalJavaThreadPriority) {
3137 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3138 // See set_native_priority() and set_lwp_class_and_priority().
3139 // Save original MaxPriority mapping in case attempt to
3140 // use critical priority fails.
3141 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3142 // Set negative to distinguish from other priorities
3143 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3144 }
3145
3146 // Get IDs for a set of well-known scheduling classes.
3147 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3148 // the system. We should have a loop that iterates over the
3149 // classID values, which are known to be "small" integers.
3150
3151 strcpy(ClassInfo.pc_clname, "TS");
3152 ClassInfo.pc_cid = -1;
3153 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3154 if (rslt < 0) return errno;
3155 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3156 tsLimits.schedPolicy = ClassInfo.pc_cid;
3157 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3158 tsLimits.minPrio = -tsLimits.maxPrio;
3159
3160 strcpy(ClassInfo.pc_clname, "IA");
3161 ClassInfo.pc_cid = -1;
3162 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3163 if (rslt < 0) return errno;
3164 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3165 iaLimits.schedPolicy = ClassInfo.pc_cid;
3166 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3167 iaLimits.minPrio = -iaLimits.maxPrio;
3168
3169 strcpy(ClassInfo.pc_clname, "RT");
3170 ClassInfo.pc_cid = -1;
3171 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3172 if (rslt < 0) return errno;
3173 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3174 rtLimits.schedPolicy = ClassInfo.pc_cid;
3175 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3176 rtLimits.minPrio = 0;
3177
3178 strcpy(ClassInfo.pc_clname, "FX");
3179 ClassInfo.pc_cid = -1;
3180 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3181 if (rslt < 0) return errno;
3182 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3183 fxLimits.schedPolicy = ClassInfo.pc_cid;
3184 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3185 fxLimits.minPrio = 0;
3186
3187 // Query our "current" scheduling class.
3188 // This will normally be IA, TS or, rarely, FX or RT.
3189 memset(&ParmInfo, 0, sizeof(ParmInfo));
3190 ParmInfo.pc_cid = PC_CLNULL;
3191 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3192 if (rslt < 0) return errno;
3193 myClass = ParmInfo.pc_cid;
3194
3195 // We now know our scheduling classId, get specific information
3196 // about the class.
3197 ClassInfo.pc_cid = myClass;
3198 ClassInfo.pc_clname[0] = 0;
3199 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3200 if (rslt < 0) return errno;
3201
3202 if (ThreadPriorityVerbose) {
3203 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3204 }
3205
3206 memset(&ParmInfo, 0, sizeof(pcparms_t));
3207 ParmInfo.pc_cid = PC_CLNULL;
3208 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3209 if (rslt < 0) return errno;
3210
3211 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3212 myMin = rtLimits.minPrio;
3213 myMax = rtLimits.maxPrio;
3214 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3215 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3216 myMin = iaLimits.minPrio;
3217 myMax = iaLimits.maxPrio;
3218 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3219 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3220 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3221 myMin = tsLimits.minPrio;
3222 myMax = tsLimits.maxPrio;
3223 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3224 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3225 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3226 myMin = fxLimits.minPrio;
3227 myMax = fxLimits.maxPrio;
3228 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3229 } else {
3230 // No clue - punt
3231 if (ThreadPriorityVerbose) {
3232 tty->print_cr("Unknown scheduling class: %s ... \n",
3233 ClassInfo.pc_clname);
3234 }
3235 return EINVAL; // no clue, punt
3236 }
3237
3238 if (ThreadPriorityVerbose) {
3239 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3240 }
3241
3242 priocntl_enable = true; // Enable changing priorities
3243 return 0;
3244 }
3245
3246 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3247 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3248 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3249 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3250
3251
3252 // scale_to_lwp_priority
3253 //
3254 // Convert from the libthread "thr_setprio" scale to our current
3255 // lwp scheduling class scale.
3256 //
3257 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3258 int v;
3259
3260 if (x == 127) return rMax; // avoid round-down
3261 v = (((x*(rMax-rMin)))/128)+rMin;
3262 return v;
3263 }
3264
3265
3266 // set_lwp_class_and_priority
3267 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3268 int newPrio, int new_class, bool scale) {
3269 int rslt;
3270 int Actual, Expected, prv;
3271 pcparms_t ParmInfo; // for GET-SET
3272 #ifdef ASSERT
3273 pcparms_t ReadBack; // for readback
3274 #endif
3275
3276 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3277 // Query current values.
3278 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3279 // Cache "pcparms_t" in global ParmCache.
3280 // TODO: elide set-to-same-value
3281
3282 // If something went wrong on init, don't change priorities.
3283 if (!priocntl_enable) {
3284 if (ThreadPriorityVerbose) {
3285 tty->print_cr("Trying to set priority but init failed, ignoring");
3286 }
3287 return EINVAL;
3288 }
3289
3290 // If lwp hasn't started yet, just return
3291 // the _start routine will call us again.
3292 if (lwpid <= 0) {
3293 if (ThreadPriorityVerbose) {
3294 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3295 INTPTR_FORMAT " to %d, lwpid not set",
3296 ThreadID, newPrio);
3297 }
3298 return 0;
3299 }
3300
3301 if (ThreadPriorityVerbose) {
3302 tty->print_cr ("set_lwp_class_and_priority("
3303 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3304 ThreadID, lwpid, newPrio);
3305 }
3306
3307 memset(&ParmInfo, 0, sizeof(pcparms_t));
3308 ParmInfo.pc_cid = PC_CLNULL;
3309 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3310 if (rslt < 0) return errno;
3311
3312 int cur_class = ParmInfo.pc_cid;
3313 ParmInfo.pc_cid = (id_t)new_class;
3314
3315 if (new_class == rtLimits.schedPolicy) {
3316 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3317 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3318 rtLimits.maxPrio, newPrio)
3319 : newPrio;
3320 rtInfo->rt_tqsecs = RT_NOCHANGE;
3321 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3322 if (ThreadPriorityVerbose) {
3323 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3324 }
3325 } else if (new_class == iaLimits.schedPolicy) {
3326 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3327 int maxClamped = MIN2(iaLimits.maxPrio,
3328 cur_class == new_class
3329 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3330 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3331 maxClamped, newPrio)
3332 : newPrio;
3333 iaInfo->ia_uprilim = cur_class == new_class
3334 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3335 iaInfo->ia_mode = IA_NOCHANGE;
3336 if (ThreadPriorityVerbose) {
3337 tty->print_cr("IA: [%d...%d] %d->%d\n",
3338 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3339 }
3340 } else if (new_class == tsLimits.schedPolicy) {
3341 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3342 int maxClamped = MIN2(tsLimits.maxPrio,
3343 cur_class == new_class
3344 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3345 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3346 maxClamped, newPrio)
3347 : newPrio;
3348 tsInfo->ts_uprilim = cur_class == new_class
3349 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3350 if (ThreadPriorityVerbose) {
3351 tty->print_cr("TS: [%d...%d] %d->%d\n",
3352 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3353 }
3354 } else if (new_class == fxLimits.schedPolicy) {
3355 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3356 int maxClamped = MIN2(fxLimits.maxPrio,
3357 cur_class == new_class
3358 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3359 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3360 maxClamped, newPrio)
3361 : newPrio;
3362 fxInfo->fx_uprilim = cur_class == new_class
3363 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3364 fxInfo->fx_tqsecs = FX_NOCHANGE;
3365 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3366 if (ThreadPriorityVerbose) {
3367 tty->print_cr("FX: [%d...%d] %d->%d\n",
3368 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3369 }
3370 } else {
3371 if (ThreadPriorityVerbose) {
3372 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3373 }
3374 return EINVAL; // no clue, punt
3375 }
3376
3377 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3378 if (ThreadPriorityVerbose && rslt) {
3379 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3380 }
3381 if (rslt < 0) return errno;
3382
3383 #ifdef ASSERT
3384 // Sanity check: read back what we just attempted to set.
3385 // In theory it could have changed in the interim ...
3386 //
3387 // The priocntl system call is tricky.
3388 // Sometimes it'll validate the priority value argument and
3389 // return EINVAL if unhappy. At other times it fails silently.
3390 // Readbacks are prudent.
3391
3392 if (!ReadBackValidate) return 0;
3393
3394 memset(&ReadBack, 0, sizeof(pcparms_t));
3395 ReadBack.pc_cid = PC_CLNULL;
3396 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3397 assert(rslt >= 0, "priocntl failed");
3398 Actual = Expected = 0xBAD;
3399 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3400 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3401 Actual = RTPRI(ReadBack)->rt_pri;
3402 Expected = RTPRI(ParmInfo)->rt_pri;
3403 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3404 Actual = IAPRI(ReadBack)->ia_upri;
3405 Expected = IAPRI(ParmInfo)->ia_upri;
3406 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3407 Actual = TSPRI(ReadBack)->ts_upri;
3408 Expected = TSPRI(ParmInfo)->ts_upri;
3409 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3410 Actual = FXPRI(ReadBack)->fx_upri;
3411 Expected = FXPRI(ParmInfo)->fx_upri;
3412 } else {
3413 if (ThreadPriorityVerbose) {
3414 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3415 ParmInfo.pc_cid);
3416 }
3417 }
3418
3419 if (Actual != Expected) {
3420 if (ThreadPriorityVerbose) {
3421 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3422 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3423 }
3424 }
3425 #endif
3426
3427 return 0;
3428 }
3429
3430 // Solaris only gives access to 128 real priorities at a time,
3431 // so we expand Java's ten to fill this range. This would be better
3432 // if we dynamically adjusted relative priorities.
3433 //
3434 // The ThreadPriorityPolicy option allows us to select 2 different
3435 // priority scales.
3436 //
3437 // ThreadPriorityPolicy=0
3438 // Since the Solaris' default priority is MaximumPriority, we do not
3439 // set a priority lower than Max unless a priority lower than
3440 // NormPriority is requested.
3441 //
3442 // ThreadPriorityPolicy=1
3443 // This mode causes the priority table to get filled with
3444 // linear values. NormPriority get's mapped to 50% of the
3445 // Maximum priority an so on. This will cause VM threads
3446 // to get unfair treatment against other Solaris processes
3447 // which do not explicitly alter their thread priorities.
3448
3449 int os::java_to_os_priority[CriticalPriority + 1] = {
3450 -99999, // 0 Entry should never be used
3451
3452 0, // 1 MinPriority
3453 32, // 2
3454 64, // 3
3455
3456 96, // 4
3457 127, // 5 NormPriority
3458 127, // 6
3459
3460 127, // 7
3461 127, // 8
3462 127, // 9 NearMaxPriority
3463
3464 127, // 10 MaxPriority
3465
3466 -criticalPrio // 11 CriticalPriority
3467 };
3468
3469 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3470 OSThread* osthread = thread->osthread();
3471
3472 // Save requested priority in case the thread hasn't been started
3473 osthread->set_native_priority(newpri);
3474
3475 // Check for critical priority request
3476 bool fxcritical = false;
3477 if (newpri == -criticalPrio) {
3478 fxcritical = true;
3479 newpri = criticalPrio;
3480 }
3481
3482 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3483 if (!UseThreadPriorities) return OS_OK;
3484
3485 int status = 0;
3486
3487 if (!fxcritical) {
3488 // Use thr_setprio only if we have a priority that thr_setprio understands
3489 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3490 }
3491
3492 int lwp_status =
3493 set_lwp_class_and_priority(osthread->thread_id(),
3494 osthread->lwp_id(),
3495 newpri,
3496 fxcritical ? fxLimits.schedPolicy : myClass,
3497 !fxcritical);
3498 if (lwp_status != 0 && fxcritical) {
3499 // Try again, this time without changing the scheduling class
3500 newpri = java_MaxPriority_to_os_priority;
3501 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3502 osthread->lwp_id(),
3503 newpri, myClass, false);
3504 }
3505 status |= lwp_status;
3506 return (status == 0) ? OS_OK : OS_ERR;
3507 }
3508
3509
3510 OSReturn os::get_native_priority(const Thread* const thread,
3511 int *priority_ptr) {
3512 int p;
3513 if (!UseThreadPriorities) {
3514 *priority_ptr = NormalPriority;
3515 return OS_OK;
3516 }
3517 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3518 if (status != 0) {
3519 return OS_ERR;
3520 }
3521 *priority_ptr = p;
3522 return OS_OK;
3523 }
3524
3525
3526 // Hint to the underlying OS that a task switch would not be good.
3527 // Void return because it's a hint and can fail.
3528 void os::hint_no_preempt() {
3529 schedctl_start(schedctl_init());
3530 }
3531
3532 static void resume_clear_context(OSThread *osthread) {
3533 osthread->set_ucontext(NULL);
3534 }
3535
3536 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3537 osthread->set_ucontext(context);
3538 }
3539
3540 static PosixSemaphore sr_semaphore;
3541
3542 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3543 // Save and restore errno to avoid confusing native code with EINTR
3544 // after sigsuspend.
3545 int old_errno = errno;
3546
3547 OSThread* osthread = thread->osthread();
3548 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3549
3550 os::SuspendResume::State current = osthread->sr.state();
3551 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3552 suspend_save_context(osthread, uc);
3553
3554 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3555 os::SuspendResume::State state = osthread->sr.suspended();
3556 if (state == os::SuspendResume::SR_SUSPENDED) {
3557 sigset_t suspend_set; // signals for sigsuspend()
3558
3559 // get current set of blocked signals and unblock resume signal
3560 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3561 sigdelset(&suspend_set, os::Solaris::SIGasync());
3562
3563 sr_semaphore.signal();
3564 // wait here until we are resumed
3565 while (1) {
3566 sigsuspend(&suspend_set);
3567
3568 os::SuspendResume::State result = osthread->sr.running();
3569 if (result == os::SuspendResume::SR_RUNNING) {
3570 sr_semaphore.signal();
3571 break;
3572 }
3573 }
3574
3575 } else if (state == os::SuspendResume::SR_RUNNING) {
3576 // request was cancelled, continue
3577 } else {
3578 ShouldNotReachHere();
3579 }
3580
3581 resume_clear_context(osthread);
3582 } else if (current == os::SuspendResume::SR_RUNNING) {
3583 // request was cancelled, continue
3584 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3585 // ignore
3586 } else {
3587 // ignore
3588 }
3589
3590 errno = old_errno;
3591 }
3592
3593 void os::print_statistics() {
3594 }
3595
3596 bool os::message_box(const char* title, const char* message) {
3597 int i;
3598 fdStream err(defaultStream::error_fd());
3599 for (i = 0; i < 78; i++) err.print_raw("=");
3600 err.cr();
3601 err.print_raw_cr(title);
3602 for (i = 0; i < 78; i++) err.print_raw("-");
3603 err.cr();
3604 err.print_raw_cr(message);
3605 for (i = 0; i < 78; i++) err.print_raw("=");
3606 err.cr();
3607
3608 char buf[16];
3609 // Prevent process from exiting upon "read error" without consuming all CPU
3610 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3611
3612 return buf[0] == 'y' || buf[0] == 'Y';
3613 }
3614
3615 static int sr_notify(OSThread* osthread) {
3616 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3617 assert_status(status == 0, status, "thr_kill");
3618 return status;
3619 }
3620
3621 // "Randomly" selected value for how long we want to spin
3622 // before bailing out on suspending a thread, also how often
3623 // we send a signal to a thread we want to resume
3624 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3625 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3626
3627 static bool do_suspend(OSThread* osthread) {
3628 assert(osthread->sr.is_running(), "thread should be running");
3629 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3630
3631 // mark as suspended and send signal
3632 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3633 // failed to switch, state wasn't running?
3634 ShouldNotReachHere();
3635 return false;
3636 }
3637
3638 if (sr_notify(osthread) != 0) {
3639 ShouldNotReachHere();
3640 }
3641
3642 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3643 while (true) {
3644 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3645 break;
3646 } else {
3647 // timeout
3648 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3649 if (cancelled == os::SuspendResume::SR_RUNNING) {
3650 return false;
3651 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3652 // make sure that we consume the signal on the semaphore as well
3653 sr_semaphore.wait();
3654 break;
3655 } else {
3656 ShouldNotReachHere();
3657 return false;
3658 }
3659 }
3660 }
3661
3662 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3663 return true;
3664 }
3665
3666 static void do_resume(OSThread* osthread) {
3667 assert(osthread->sr.is_suspended(), "thread should be suspended");
3668 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3669
3670 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3671 // failed to switch to WAKEUP_REQUEST
3672 ShouldNotReachHere();
3673 return;
3674 }
3675
3676 while (true) {
3677 if (sr_notify(osthread) == 0) {
3678 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3679 if (osthread->sr.is_running()) {
3680 return;
3681 }
3682 }
3683 } else {
3684 ShouldNotReachHere();
3685 }
3686 }
3687
3688 guarantee(osthread->sr.is_running(), "Must be running!");
3689 }
3690
3691 void os::SuspendedThreadTask::internal_do_task() {
3692 if (do_suspend(_thread->osthread())) {
3693 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3694 do_task(context);
3695 do_resume(_thread->osthread());
3696 }
3697 }
3698
3699 class PcFetcher : public os::SuspendedThreadTask {
3700 public:
3701 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3702 ExtendedPC result();
3703 protected:
3704 void do_task(const os::SuspendedThreadTaskContext& context);
3705 private:
3706 ExtendedPC _epc;
3707 };
3708
3709 ExtendedPC PcFetcher::result() {
3710 guarantee(is_done(), "task is not done yet.");
3711 return _epc;
3712 }
3713
3714 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3715 Thread* thread = context.thread();
3716 OSThread* osthread = thread->osthread();
3717 if (osthread->ucontext() != NULL) {
3718 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext());
3719 } else {
3720 // NULL context is unexpected, double-check this is the VMThread
3721 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3722 }
3723 }
3724
3725 // A lightweight implementation that does not suspend the target thread and
3726 // thus returns only a hint. Used for profiling only!
3727 ExtendedPC os::get_thread_pc(Thread* thread) {
3728 // Make sure that it is called by the watcher and the Threads lock is owned.
3729 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3730 // For now, is only used to profile the VM Thread
3731 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3732 PcFetcher fetcher(thread);
3733 fetcher.run();
3734 return fetcher.result();
3735 }
3736
3737
3738 // This does not do anything on Solaris. This is basically a hook for being
3739 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3740 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3741 const methodHandle& method, JavaCallArguments* args,
3742 Thread* thread) {
3743 f(value, method, args, thread);
3744 }
3745
3746 // This routine may be used by user applications as a "hook" to catch signals.
3747 // The user-defined signal handler must pass unrecognized signals to this
3748 // routine, and if it returns true (non-zero), then the signal handler must
3749 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3750 // routine will never retun false (zero), but instead will execute a VM panic
3751 // routine kill the process.
3752 //
3753 // If this routine returns false, it is OK to call it again. This allows
3754 // the user-defined signal handler to perform checks either before or after
3755 // the VM performs its own checks. Naturally, the user code would be making
3756 // a serious error if it tried to handle an exception (such as a null check
3757 // or breakpoint) that the VM was generating for its own correct operation.
3758 //
3759 // This routine may recognize any of the following kinds of signals:
3760 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3761 // os::Solaris::SIGasync
3762 // It should be consulted by handlers for any of those signals.
3763 //
3764 // The caller of this routine must pass in the three arguments supplied
3765 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3766 // field of the structure passed to sigaction(). This routine assumes that
3767 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3768 //
3769 // Note that the VM will print warnings if it detects conflicting signal
3770 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3771 //
3772 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3773 siginfo_t* siginfo,
3774 void* ucontext,
3775 int abort_if_unrecognized);
3776
3777
3778 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3779 int orig_errno = errno; // Preserve errno value over signal handler.
3780 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3781 errno = orig_errno;
3782 }
3783
3784 // This boolean allows users to forward their own non-matching signals
3785 // to JVM_handle_solaris_signal, harmlessly.
3786 bool os::Solaris::signal_handlers_are_installed = false;
3787
3788 // For signal-chaining
3789 bool os::Solaris::libjsig_is_loaded = false;
3790 typedef struct sigaction *(*get_signal_t)(int);
3791 get_signal_t os::Solaris::get_signal_action = NULL;
3792
3793 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3794 struct sigaction *actp = NULL;
3795
3796 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3797 // Retrieve the old signal handler from libjsig
3798 actp = (*get_signal_action)(sig);
3799 }
3800 if (actp == NULL) {
3801 // Retrieve the preinstalled signal handler from jvm
3802 actp = get_preinstalled_handler(sig);
3803 }
3804
3805 return actp;
3806 }
3807
3808 static bool call_chained_handler(struct sigaction *actp, int sig,
3809 siginfo_t *siginfo, void *context) {
3810 // Call the old signal handler
3811 if (actp->sa_handler == SIG_DFL) {
3812 // It's more reasonable to let jvm treat it as an unexpected exception
3813 // instead of taking the default action.
3814 return false;
3815 } else if (actp->sa_handler != SIG_IGN) {
3816 if ((actp->sa_flags & SA_NODEFER) == 0) {
3817 // automaticlly block the signal
3818 sigaddset(&(actp->sa_mask), sig);
3819 }
3820
3821 sa_handler_t hand;
3822 sa_sigaction_t sa;
3823 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3824 // retrieve the chained handler
3825 if (siginfo_flag_set) {
3826 sa = actp->sa_sigaction;
3827 } else {
3828 hand = actp->sa_handler;
3829 }
3830
3831 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3832 actp->sa_handler = SIG_DFL;
3833 }
3834
3835 // try to honor the signal mask
3836 sigset_t oset;
3837 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3838
3839 // call into the chained handler
3840 if (siginfo_flag_set) {
3841 (*sa)(sig, siginfo, context);
3842 } else {
3843 (*hand)(sig);
3844 }
3845
3846 // restore the signal mask
3847 pthread_sigmask(SIG_SETMASK, &oset, 0);
3848 }
3849 // Tell jvm's signal handler the signal is taken care of.
3850 return true;
3851 }
3852
3853 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3854 bool chained = false;
3855 // signal-chaining
3856 if (UseSignalChaining) {
3857 struct sigaction *actp = get_chained_signal_action(sig);
3858 if (actp != NULL) {
3859 chained = call_chained_handler(actp, sig, siginfo, context);
3860 }
3861 }
3862 return chained;
3863 }
3864
3865 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3866 assert((chainedsigactions != (struct sigaction *)NULL) &&
3867 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3868 if (preinstalled_sigs[sig] != 0) {
3869 return &chainedsigactions[sig];
3870 }
3871 return NULL;
3872 }
3873
3874 void os::Solaris::save_preinstalled_handler(int sig,
3875 struct sigaction& oldAct) {
3876 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3877 assert((chainedsigactions != (struct sigaction *)NULL) &&
3878 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3879 chainedsigactions[sig] = oldAct;
3880 preinstalled_sigs[sig] = 1;
3881 }
3882
3883 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3884 bool oktochain) {
3885 // Check for overwrite.
3886 struct sigaction oldAct;
3887 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3888 void* oldhand =
3889 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3890 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3891 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3892 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3893 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3894 if (AllowUserSignalHandlers || !set_installed) {
3895 // Do not overwrite; user takes responsibility to forward to us.
3896 return;
3897 } else if (UseSignalChaining) {
3898 if (oktochain) {
3899 // save the old handler in jvm
3900 save_preinstalled_handler(sig, oldAct);
3901 } else {
3902 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3903 }
3904 // libjsig also interposes the sigaction() call below and saves the
3905 // old sigaction on it own.
3906 } else {
3907 fatal("Encountered unexpected pre-existing sigaction handler "
3908 "%#lx for signal %d.", (long)oldhand, sig);
3909 }
3910 }
3911
3912 struct sigaction sigAct;
3913 sigfillset(&(sigAct.sa_mask));
3914 sigAct.sa_handler = SIG_DFL;
3915
3916 sigAct.sa_sigaction = signalHandler;
3917 // Handle SIGSEGV on alternate signal stack if
3918 // not using stack banging
3919 if (!UseStackBanging && sig == SIGSEGV) {
3920 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3921 } else {
3922 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3923 }
3924 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3925
3926 sigaction(sig, &sigAct, &oldAct);
3927
3928 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3929 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3930 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3931 }
3932
3933
3934 #define DO_SIGNAL_CHECK(sig) \
3935 do { \
3936 if (!sigismember(&check_signal_done, sig)) { \
3937 os::Solaris::check_signal_handler(sig); \
3938 } \
3939 } while (0)
3940
3941 // This method is a periodic task to check for misbehaving JNI applications
3942 // under CheckJNI, we can add any periodic checks here
3943
3944 void os::run_periodic_checks() {
3945 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3946 // thereby preventing a NULL checks.
3947 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3948
3949 if (check_signals == false) return;
3950
3951 // SEGV and BUS if overridden could potentially prevent
3952 // generation of hs*.log in the event of a crash, debugging
3953 // such a case can be very challenging, so we absolutely
3954 // check for the following for a good measure:
3955 DO_SIGNAL_CHECK(SIGSEGV);
3956 DO_SIGNAL_CHECK(SIGILL);
3957 DO_SIGNAL_CHECK(SIGFPE);
3958 DO_SIGNAL_CHECK(SIGBUS);
3959 DO_SIGNAL_CHECK(SIGPIPE);
3960 DO_SIGNAL_CHECK(SIGXFSZ);
3961
3962 // ReduceSignalUsage allows the user to override these handlers
3963 // see comments at the very top and jvm_solaris.h
3964 if (!ReduceSignalUsage) {
3965 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3966 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3967 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3968 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3969 }
3970
3971 // See comments above for using JVM1/JVM2
3972 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
3973
3974 }
3975
3976 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3977
3978 static os_sigaction_t os_sigaction = NULL;
3979
3980 void os::Solaris::check_signal_handler(int sig) {
3981 char buf[O_BUFLEN];
3982 address jvmHandler = NULL;
3983
3984 struct sigaction act;
3985 if (os_sigaction == NULL) {
3986 // only trust the default sigaction, in case it has been interposed
3987 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3988 if (os_sigaction == NULL) return;
3989 }
3990
3991 os_sigaction(sig, (struct sigaction*)NULL, &act);
3992
3993 address thisHandler = (act.sa_flags & SA_SIGINFO)
3994 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3995 : CAST_FROM_FN_PTR(address, act.sa_handler);
3996
3997
3998 switch (sig) {
3999 case SIGSEGV:
4000 case SIGBUS:
4001 case SIGFPE:
4002 case SIGPIPE:
4003 case SIGXFSZ:
4004 case SIGILL:
4005 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4006 break;
4007
4008 case SHUTDOWN1_SIGNAL:
4009 case SHUTDOWN2_SIGNAL:
4010 case SHUTDOWN3_SIGNAL:
4011 case BREAK_SIGNAL:
4012 jvmHandler = (address)user_handler();
4013 break;
4014
4015 default:
4016 int asynsig = os::Solaris::SIGasync();
4017
4018 if (sig == asynsig) {
4019 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4020 } else {
4021 return;
4022 }
4023 break;
4024 }
4025
4026
4027 if (thisHandler != jvmHandler) {
4028 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4029 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4030 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4031 // No need to check this sig any longer
4032 sigaddset(&check_signal_done, sig);
4033 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4034 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4035 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4036 exception_name(sig, buf, O_BUFLEN));
4037 }
4038 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4039 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4040 tty->print("expected:");
4041 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
4042 tty->cr();
4043 tty->print(" found:");
4044 os::Posix::print_sa_flags(tty, act.sa_flags);
4045 tty->cr();
4046 // No need to check this sig any longer
4047 sigaddset(&check_signal_done, sig);
4048 }
4049
4050 // Print all the signal handler state
4051 if (sigismember(&check_signal_done, sig)) {
4052 print_signal_handlers(tty, buf, O_BUFLEN);
4053 }
4054
4055 }
4056
4057 void os::Solaris::install_signal_handlers() {
4058 bool libjsigdone = false;
4059 signal_handlers_are_installed = true;
4060
4061 // signal-chaining
4062 typedef void (*signal_setting_t)();
4063 signal_setting_t begin_signal_setting = NULL;
4064 signal_setting_t end_signal_setting = NULL;
4065 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4066 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4067 if (begin_signal_setting != NULL) {
4068 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4069 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4070 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4071 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4072 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4073 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4074 libjsig_is_loaded = true;
4075 if (os::Solaris::get_libjsig_version != NULL) {
4076 libjsigversion = (*os::Solaris::get_libjsig_version)();
4077 }
4078 assert(UseSignalChaining, "should enable signal-chaining");
4079 }
4080 if (libjsig_is_loaded) {
4081 // Tell libjsig jvm is setting signal handlers
4082 (*begin_signal_setting)();
4083 }
4084
4085 set_signal_handler(SIGSEGV, true, true);
4086 set_signal_handler(SIGPIPE, true, true);
4087 set_signal_handler(SIGXFSZ, true, true);
4088 set_signal_handler(SIGBUS, true, true);
4089 set_signal_handler(SIGILL, true, true);
4090 set_signal_handler(SIGFPE, true, true);
4091
4092
4093 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4094 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4095 // can not register overridable signals which might be > 32
4096 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4097 // Tell libjsig jvm has finished setting signal handlers
4098 (*end_signal_setting)();
4099 libjsigdone = true;
4100 }
4101 }
4102
4103 set_signal_handler(os::Solaris::SIGasync(), true, true);
4104
4105 if (libjsig_is_loaded && !libjsigdone) {
4106 // Tell libjsig jvm finishes setting signal handlers
4107 (*end_signal_setting)();
4108 }
4109
4110 // We don't activate signal checker if libjsig is in place, we trust ourselves
4111 // and if UserSignalHandler is installed all bets are off.
4112 // Log that signal checking is off only if -verbose:jni is specified.
4113 if (CheckJNICalls) {
4114 if (libjsig_is_loaded) {
4115 if (PrintJNIResolving) {
4116 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4117 }
4118 check_signals = false;
4119 }
4120 if (AllowUserSignalHandlers) {
4121 if (PrintJNIResolving) {
4122 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4123 }
4124 check_signals = false;
4125 }
4126 }
4127 }
4128
4129
4130 void report_error(const char* file_name, int line_no, const char* title,
4131 const char* format, ...);
4132
4133 // (Static) wrappers for the liblgrp API
4134 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4135 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4136 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4137 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4138 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4139 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4140 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4141 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4142 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4143
4144 static address resolve_symbol_lazy(const char* name) {
4145 address addr = (address) dlsym(RTLD_DEFAULT, name);
4146 if (addr == NULL) {
4147 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4148 addr = (address) dlsym(RTLD_NEXT, name);
4149 }
4150 return addr;
4151 }
4152
4153 static address resolve_symbol(const char* name) {
4154 address addr = resolve_symbol_lazy(name);
4155 if (addr == NULL) {
4156 fatal(dlerror());
4157 }
4158 return addr;
4159 }
4160
4161 void os::Solaris::libthread_init() {
4162 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4163
4164 lwp_priocntl_init();
4165
4166 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4167 if (func == NULL) {
4168 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4169 // Guarantee that this VM is running on an new enough OS (5.6 or
4170 // later) that it will have a new enough libthread.so.
4171 guarantee(func != NULL, "libthread.so is too old.");
4172 }
4173
4174 int size;
4175 void (*handler_info_func)(address *, int *);
4176 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4177 handler_info_func(&handler_start, &size);
4178 handler_end = handler_start + size;
4179 }
4180
4181
4182 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4183 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4184 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4185 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4186 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4187 int os::Solaris::_mutex_scope = USYNC_THREAD;
4188
4189 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4190 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4191 int_fnP_cond_tP os::Solaris::_cond_signal;
4192 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4193 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4194 int_fnP_cond_tP os::Solaris::_cond_destroy;
4195 int os::Solaris::_cond_scope = USYNC_THREAD;
4196
4197 void os::Solaris::synchronization_init() {
4198 if (UseLWPSynchronization) {
4199 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4200 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4201 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4202 os::Solaris::set_mutex_init(lwp_mutex_init);
4203 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4204 os::Solaris::set_mutex_scope(USYNC_THREAD);
4205
4206 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4207 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4208 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4209 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4210 os::Solaris::set_cond_init(lwp_cond_init);
4211 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4212 os::Solaris::set_cond_scope(USYNC_THREAD);
4213 } else {
4214 os::Solaris::set_mutex_scope(USYNC_THREAD);
4215 os::Solaris::set_cond_scope(USYNC_THREAD);
4216
4217 if (UsePthreads) {
4218 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4219 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4220 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4221 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4222 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4223
4224 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4225 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4226 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4227 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4228 os::Solaris::set_cond_init(pthread_cond_default_init);
4229 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4230 } else {
4231 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4232 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4233 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4234 os::Solaris::set_mutex_init(::mutex_init);
4235 os::Solaris::set_mutex_destroy(::mutex_destroy);
4236
4237 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4238 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4239 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4240 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4241 os::Solaris::set_cond_init(::cond_init);
4242 os::Solaris::set_cond_destroy(::cond_destroy);
4243 }
4244 }
4245 }
4246
4247 bool os::Solaris::liblgrp_init() {
4248 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4249 if (handle != NULL) {
4250 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4251 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4252 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4253 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4254 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4255 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4256 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4257 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4258 dlsym(handle, "lgrp_cookie_stale")));
4259
4260 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4261 set_lgrp_cookie(c);
4262 return true;
4263 }
4264 return false;
4265 }
4266
4267 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4268 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4269 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4270
4271 void init_pset_getloadavg_ptr(void) {
4272 pset_getloadavg_ptr =
4273 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4274 if (pset_getloadavg_ptr == NULL) {
4275 log_warning(os)("pset_getloadavg function not found");
4276 }
4277 }
4278
4279 int os::Solaris::_dev_zero_fd = -1;
4280
4281 // this is called _before_ the global arguments have been parsed
4282 void os::init(void) {
4283 _initial_pid = getpid();
4284
4285 max_hrtime = first_hrtime = gethrtime();
4286
4287 init_random(1234567);
4288
4289 page_size = sysconf(_SC_PAGESIZE);
4290 if (page_size == -1) {
4291 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4292 }
4293 init_page_sizes((size_t) page_size);
4294
4295 Solaris::initialize_system_info();
4296
4297 int fd = ::open("/dev/zero", O_RDWR);
4298 if (fd < 0) {
4299 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4300 } else {
4301 Solaris::set_dev_zero_fd(fd);
4302
4303 // Close on exec, child won't inherit.
4304 fcntl(fd, F_SETFD, FD_CLOEXEC);
4305 }
4306
4307 clock_tics_per_sec = CLK_TCK;
4308
4309 // check if dladdr1() exists; dladdr1 can provide more information than
4310 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4311 // and is available on linker patches for 5.7 and 5.8.
4312 // libdl.so must have been loaded, this call is just an entry lookup
4313 void * hdl = dlopen("libdl.so", RTLD_NOW);
4314 if (hdl) {
4315 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4316 }
4317
4318 // (Solaris only) this switches to calls that actually do locking.
4319 ThreadCritical::initialize();
4320
4321 main_thread = thr_self();
4322
4323 // Constant minimum stack size allowed. It must be at least
4324 // the minimum of what the OS supports (thr_min_stack()), and
4325 // enough to allow the thread to get to user bytecode execution.
4326 Posix::_compiler_thread_min_stack_allowed = MAX2(thr_min_stack(),
4327 Posix::_compiler_thread_min_stack_allowed);
4328 Posix::_java_thread_min_stack_allowed = MAX2(thr_min_stack(),
4329 Posix::_java_thread_min_stack_allowed);
4330 Posix::_vm_internal_thread_min_stack_allowed = MAX2(thr_min_stack(),
4331 Posix::_vm_internal_thread_min_stack_allowed);
4332
4333 // dynamic lookup of functions that may not be available in our lowest
4334 // supported Solaris release
4335 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4336 if (handle != NULL) {
4337 Solaris::_pthread_setname_np = // from 11.3
4338 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4339 }
4340 }
4341
4342 // To install functions for atexit system call
4343 extern "C" {
4344 static void perfMemory_exit_helper() {
4345 perfMemory_exit();
4346 }
4347 }
4348
4349 // this is called _after_ the global arguments have been parsed
4350 jint os::init_2(void) {
4351 // try to enable extended file IO ASAP, see 6431278
4352 os::Solaris::try_enable_extended_io();
4353
4354 // Allocate a single page and mark it as readable for safepoint polling. Also
4355 // use this first mmap call to check support for MAP_ALIGN.
4356 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4357 page_size,
4358 MAP_PRIVATE | MAP_ALIGN,
4359 PROT_READ);
4360 if (polling_page == NULL) {
4361 has_map_align = false;
4362 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4363 PROT_READ);
4364 }
4365
4366 os::set_polling_page(polling_page);
4367 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4368
4369 if (!UseMembar) {
4370 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4371 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4372 os::set_memory_serialize_page(mem_serialize_page);
4373 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4374 }
4375
4376 // Check and sets minimum stack sizes against command line options
4377 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4378 return JNI_ERR;
4379 }
4380
4381 Solaris::libthread_init();
4382
4383 if (UseNUMA) {
4384 if (!Solaris::liblgrp_init()) {
4385 UseNUMA = false;
4386 } else {
4387 size_t lgrp_limit = os::numa_get_groups_num();
4388 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4389 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4390 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4391 if (lgrp_num < 2) {
4392 // There's only one locality group, disable NUMA.
4393 UseNUMA = false;
4394 }
4395 }
4396 if (!UseNUMA && ForceNUMA) {
4397 UseNUMA = true;
4398 }
4399 }
4400
4401 Solaris::signal_sets_init();
4402 Solaris::init_signal_mem();
4403 Solaris::install_signal_handlers();
4404
4405 if (libjsigversion < JSIG_VERSION_1_4_1) {
4406 Maxlibjsigsigs = OLDMAXSIGNUM;
4407 }
4408
4409 // initialize synchronization primitives to use either thread or
4410 // lwp synchronization (controlled by UseLWPSynchronization)
4411 Solaris::synchronization_init();
4412
4413 if (MaxFDLimit) {
4414 // set the number of file descriptors to max. print out error
4415 // if getrlimit/setrlimit fails but continue regardless.
4416 struct rlimit nbr_files;
4417 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4418 if (status != 0) {
4419 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4420 } else {
4421 nbr_files.rlim_cur = nbr_files.rlim_max;
4422 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4423 if (status != 0) {
4424 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4425 }
4426 }
4427 }
4428
4429 // Calculate theoretical max. size of Threads to guard gainst
4430 // artifical out-of-memory situations, where all available address-
4431 // space has been reserved by thread stacks. Default stack size is 1Mb.
4432 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4433 JavaThread::stack_size_at_create() : (1*K*K);
4434 assert(pre_thread_stack_size != 0, "Must have a stack");
4435 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4436 // we should start doing Virtual Memory banging. Currently when the threads will
4437 // have used all but 200Mb of space.
4438 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4439 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4440
4441 // at-exit methods are called in the reverse order of their registration.
4442 // In Solaris 7 and earlier, atexit functions are called on return from
4443 // main or as a result of a call to exit(3C). There can be only 32 of
4444 // these functions registered and atexit() does not set errno. In Solaris
4445 // 8 and later, there is no limit to the number of functions registered
4446 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4447 // functions are called upon dlclose(3DL) in addition to return from main
4448 // and exit(3C).
4449
4450 if (PerfAllowAtExitRegistration) {
4451 // only register atexit functions if PerfAllowAtExitRegistration is set.
4452 // atexit functions can be delayed until process exit time, which
4453 // can be problematic for embedded VM situations. Embedded VMs should
4454 // call DestroyJavaVM() to assure that VM resources are released.
4455
4456 // note: perfMemory_exit_helper atexit function may be removed in
4457 // the future if the appropriate cleanup code can be added to the
4458 // VM_Exit VMOperation's doit method.
4459 if (atexit(perfMemory_exit_helper) != 0) {
4460 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4461 }
4462 }
4463
4464 // Init pset_loadavg function pointer
4465 init_pset_getloadavg_ptr();
4466
4467 return JNI_OK;
4468 }
4469
4470 // Mark the polling page as unreadable
4471 void os::make_polling_page_unreadable(void) {
4472 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4473 fatal("Could not disable polling page");
4474 }
4475 }
4476
4477 // Mark the polling page as readable
4478 void os::make_polling_page_readable(void) {
4479 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4480 fatal("Could not enable polling page");
4481 }
4482 }
4483
4484 // Is a (classpath) directory empty?
4485 bool os::dir_is_empty(const char* path) {
4486 DIR *dir = NULL;
4487 struct dirent *ptr;
4488
4489 dir = opendir(path);
4490 if (dir == NULL) return true;
4491
4492 // Scan the directory
4493 bool result = true;
4494 char buf[sizeof(struct dirent) + MAX_PATH];
4495 struct dirent *dbuf = (struct dirent *) buf;
4496 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4497 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4498 result = false;
4499 }
4500 }
4501 closedir(dir);
4502 return result;
4503 }
4504
4505 // This code originates from JDK's sysOpen and open64_w
4506 // from src/solaris/hpi/src/system_md.c
4507
4508 int os::open(const char *path, int oflag, int mode) {
4509 if (strlen(path) > MAX_PATH - 1) {
4510 errno = ENAMETOOLONG;
4511 return -1;
4512 }
4513 int fd;
4514
4515 fd = ::open64(path, oflag, mode);
4516 if (fd == -1) return -1;
4517
4518 // If the open succeeded, the file might still be a directory
4519 {
4520 struct stat64 buf64;
4521 int ret = ::fstat64(fd, &buf64);
4522 int st_mode = buf64.st_mode;
4523
4524 if (ret != -1) {
4525 if ((st_mode & S_IFMT) == S_IFDIR) {
4526 errno = EISDIR;
4527 ::close(fd);
4528 return -1;
4529 }
4530 } else {
4531 ::close(fd);
4532 return -1;
4533 }
4534 }
4535
4536 // 32-bit Solaris systems suffer from:
4537 //
4538 // - an historical default soft limit of 256 per-process file
4539 // descriptors that is too low for many Java programs.
4540 //
4541 // - a design flaw where file descriptors created using stdio
4542 // fopen must be less than 256, _even_ when the first limit above
4543 // has been raised. This can cause calls to fopen (but not calls to
4544 // open, for example) to fail mysteriously, perhaps in 3rd party
4545 // native code (although the JDK itself uses fopen). One can hardly
4546 // criticize them for using this most standard of all functions.
4547 //
4548 // We attempt to make everything work anyways by:
4549 //
4550 // - raising the soft limit on per-process file descriptors beyond
4551 // 256
4552 //
4553 // - As of Solaris 10u4, we can request that Solaris raise the 256
4554 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4555 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4556 //
4557 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4558 // workaround the bug by remapping non-stdio file descriptors below
4559 // 256 to ones beyond 256, which is done below.
4560 //
4561 // See:
4562 // 1085341: 32-bit stdio routines should support file descriptors >255
4563 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4564 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4565 // enable_extended_FILE_stdio() in VM initialisation
4566 // Giri Mandalika's blog
4567 // http://technopark02.blogspot.com/2005_05_01_archive.html
4568 //
4569 #ifndef _LP64
4570 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4571 int newfd = ::fcntl(fd, F_DUPFD, 256);
4572 if (newfd != -1) {
4573 ::close(fd);
4574 fd = newfd;
4575 }
4576 }
4577 #endif // 32-bit Solaris
4578
4579 // All file descriptors that are opened in the JVM and not
4580 // specifically destined for a subprocess should have the
4581 // close-on-exec flag set. If we don't set it, then careless 3rd
4582 // party native code might fork and exec without closing all
4583 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4584 // UNIXProcess.c), and this in turn might:
4585 //
4586 // - cause end-of-file to fail to be detected on some file
4587 // descriptors, resulting in mysterious hangs, or
4588 //
4589 // - might cause an fopen in the subprocess to fail on a system
4590 // suffering from bug 1085341.
4591 //
4592 // (Yes, the default setting of the close-on-exec flag is a Unix
4593 // design flaw)
4594 //
4595 // See:
4596 // 1085341: 32-bit stdio routines should support file descriptors >255
4597 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4598 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4599 //
4600 #ifdef FD_CLOEXEC
4601 {
4602 int flags = ::fcntl(fd, F_GETFD);
4603 if (flags != -1) {
4604 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4605 }
4606 }
4607 #endif
4608
4609 return fd;
4610 }
4611
4612 // create binary file, rewriting existing file if required
4613 int os::create_binary_file(const char* path, bool rewrite_existing) {
4614 int oflags = O_WRONLY | O_CREAT;
4615 if (!rewrite_existing) {
4616 oflags |= O_EXCL;
4617 }
4618 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4619 }
4620
4621 // return current position of file pointer
4622 jlong os::current_file_offset(int fd) {
4623 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4624 }
4625
4626 // move file pointer to the specified offset
4627 jlong os::seek_to_file_offset(int fd, jlong offset) {
4628 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4629 }
4630
4631 jlong os::lseek(int fd, jlong offset, int whence) {
4632 return (jlong) ::lseek64(fd, offset, whence);
4633 }
4634
4635 char * os::native_path(char *path) {
4636 return path;
4637 }
4638
4639 int os::ftruncate(int fd, jlong length) {
4640 return ::ftruncate64(fd, length);
4641 }
4642
4643 int os::fsync(int fd) {
4644 RESTARTABLE_RETURN_INT(::fsync(fd));
4645 }
4646
4647 int os::available(int fd, jlong *bytes) {
4648 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4649 "Assumed _thread_in_native");
4650 jlong cur, end;
4651 int mode;
4652 struct stat64 buf64;
4653
4654 if (::fstat64(fd, &buf64) >= 0) {
4655 mode = buf64.st_mode;
4656 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4657 int n,ioctl_return;
4658
4659 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4660 if (ioctl_return>= 0) {
4661 *bytes = n;
4662 return 1;
4663 }
4664 }
4665 }
4666 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4667 return 0;
4668 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4669 return 0;
4670 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4671 return 0;
4672 }
4673 *bytes = end - cur;
4674 return 1;
4675 }
4676
4677 // Map a block of memory.
4678 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4679 char *addr, size_t bytes, bool read_only,
4680 bool allow_exec) {
4681 int prot;
4682 int flags;
4683
4684 if (read_only) {
4685 prot = PROT_READ;
4686 flags = MAP_SHARED;
4687 } else {
4688 prot = PROT_READ | PROT_WRITE;
4689 flags = MAP_PRIVATE;
4690 }
4691
4692 if (allow_exec) {
4693 prot |= PROT_EXEC;
4694 }
4695
4696 if (addr != NULL) {
4697 flags |= MAP_FIXED;
4698 }
4699
4700 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4701 fd, file_offset);
4702 if (mapped_address == MAP_FAILED) {
4703 return NULL;
4704 }
4705 return mapped_address;
4706 }
4707
4708
4709 // Remap a block of memory.
4710 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4711 char *addr, size_t bytes, bool read_only,
4712 bool allow_exec) {
4713 // same as map_memory() on this OS
4714 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4715 allow_exec);
4716 }
4717
4718
4719 // Unmap a block of memory.
4720 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4721 return munmap(addr, bytes) == 0;
4722 }
4723
4724 void os::pause() {
4725 char filename[MAX_PATH];
4726 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4727 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4728 } else {
4729 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4730 }
4731
4732 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4733 if (fd != -1) {
4734 struct stat buf;
4735 ::close(fd);
4736 while (::stat(filename, &buf) == 0) {
4737 (void)::poll(NULL, 0, 100);
4738 }
4739 } else {
4740 jio_fprintf(stderr,
4741 "Could not open pause file '%s', continuing immediately.\n", filename);
4742 }
4743 }
4744
4745 #ifndef PRODUCT
4746 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4747 // Turn this on if you need to trace synch operations.
4748 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4749 // and call record_synch_enable and record_synch_disable
4750 // around the computation of interest.
4751
4752 void record_synch(char* name, bool returning); // defined below
4753
4754 class RecordSynch {
4755 char* _name;
4756 public:
4757 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4758 ~RecordSynch() { record_synch(_name, true); }
4759 };
4760
4761 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4762 extern "C" ret name params { \
4763 typedef ret name##_t params; \
4764 static name##_t* implem = NULL; \
4765 static int callcount = 0; \
4766 if (implem == NULL) { \
4767 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4768 if (implem == NULL) fatal(dlerror()); \
4769 } \
4770 ++callcount; \
4771 RecordSynch _rs(#name); \
4772 inner; \
4773 return implem args; \
4774 }
4775 // in dbx, examine callcounts this way:
4776 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4777
4778 #define CHECK_POINTER_OK(p) \
4779 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4780 #define CHECK_MU \
4781 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4782 #define CHECK_CV \
4783 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4784 #define CHECK_P(p) \
4785 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4786
4787 #define CHECK_MUTEX(mutex_op) \
4788 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4789
4790 CHECK_MUTEX( mutex_lock)
4791 CHECK_MUTEX( _mutex_lock)
4792 CHECK_MUTEX( mutex_unlock)
4793 CHECK_MUTEX(_mutex_unlock)
4794 CHECK_MUTEX( mutex_trylock)
4795 CHECK_MUTEX(_mutex_trylock)
4796
4797 #define CHECK_COND(cond_op) \
4798 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4799
4800 CHECK_COND( cond_wait);
4801 CHECK_COND(_cond_wait);
4802 CHECK_COND(_cond_wait_cancel);
4803
4804 #define CHECK_COND2(cond_op) \
4805 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4806
4807 CHECK_COND2( cond_timedwait);
4808 CHECK_COND2(_cond_timedwait);
4809 CHECK_COND2(_cond_timedwait_cancel);
4810
4811 // do the _lwp_* versions too
4812 #define mutex_t lwp_mutex_t
4813 #define cond_t lwp_cond_t
4814 CHECK_MUTEX( _lwp_mutex_lock)
4815 CHECK_MUTEX( _lwp_mutex_unlock)
4816 CHECK_MUTEX( _lwp_mutex_trylock)
4817 CHECK_MUTEX( __lwp_mutex_lock)
4818 CHECK_MUTEX( __lwp_mutex_unlock)
4819 CHECK_MUTEX( __lwp_mutex_trylock)
4820 CHECK_MUTEX(___lwp_mutex_lock)
4821 CHECK_MUTEX(___lwp_mutex_unlock)
4822
4823 CHECK_COND( _lwp_cond_wait);
4824 CHECK_COND( __lwp_cond_wait);
4825 CHECK_COND(___lwp_cond_wait);
4826
4827 CHECK_COND2( _lwp_cond_timedwait);
4828 CHECK_COND2( __lwp_cond_timedwait);
4829 #undef mutex_t
4830 #undef cond_t
4831
4832 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4833 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4834 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4835 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4836 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4837 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4838 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4839 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4840
4841
4842 // recording machinery:
4843
4844 enum { RECORD_SYNCH_LIMIT = 200 };
4845 char* record_synch_name[RECORD_SYNCH_LIMIT];
4846 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4847 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4848 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4849 int record_synch_count = 0;
4850 bool record_synch_enabled = false;
4851
4852 // in dbx, examine recorded data this way:
4853 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4854
4855 void record_synch(char* name, bool returning) {
4856 if (record_synch_enabled) {
4857 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4858 record_synch_name[record_synch_count] = name;
4859 record_synch_returning[record_synch_count] = returning;
4860 record_synch_thread[record_synch_count] = thr_self();
4861 record_synch_arg0ptr[record_synch_count] = &name;
4862 record_synch_count++;
4863 }
4864 // put more checking code here:
4865 // ...
4866 }
4867 }
4868
4869 void record_synch_enable() {
4870 // start collecting trace data, if not already doing so
4871 if (!record_synch_enabled) record_synch_count = 0;
4872 record_synch_enabled = true;
4873 }
4874
4875 void record_synch_disable() {
4876 // stop collecting trace data
4877 record_synch_enabled = false;
4878 }
4879
4880 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4881 #endif // PRODUCT
4882
4883 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4884 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4885 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4886
4887
4888 // JVMTI & JVM monitoring and management support
4889 // The thread_cpu_time() and current_thread_cpu_time() are only
4890 // supported if is_thread_cpu_time_supported() returns true.
4891 // They are not supported on Solaris T1.
4892
4893 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4894 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4895 // of a thread.
4896 //
4897 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4898 // returns the fast estimate available on the platform.
4899
4900 // hrtime_t gethrvtime() return value includes
4901 // user time but does not include system time
4902 jlong os::current_thread_cpu_time() {
4903 return (jlong) gethrvtime();
4904 }
4905
4906 jlong os::thread_cpu_time(Thread *thread) {
4907 // return user level CPU time only to be consistent with
4908 // what current_thread_cpu_time returns.
4909 // thread_cpu_time_info() must be changed if this changes
4910 return os::thread_cpu_time(thread, false /* user time only */);
4911 }
4912
4913 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4914 if (user_sys_cpu_time) {
4915 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4916 } else {
4917 return os::current_thread_cpu_time();
4918 }
4919 }
4920
4921 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4922 char proc_name[64];
4923 int count;
4924 prusage_t prusage;
4925 jlong lwp_time;
4926 int fd;
4927
4928 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4929 getpid(),
4930 thread->osthread()->lwp_id());
4931 fd = ::open(proc_name, O_RDONLY);
4932 if (fd == -1) return -1;
4933
4934 do {
4935 count = ::pread(fd,
4936 (void *)&prusage.pr_utime,
4937 thr_time_size,
4938 thr_time_off);
4939 } while (count < 0 && errno == EINTR);
4940 ::close(fd);
4941 if (count < 0) return -1;
4942
4943 if (user_sys_cpu_time) {
4944 // user + system CPU time
4945 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4946 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4947 (jlong)prusage.pr_stime.tv_nsec +
4948 (jlong)prusage.pr_utime.tv_nsec;
4949 } else {
4950 // user level CPU time only
4951 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4952 (jlong)prusage.pr_utime.tv_nsec;
4953 }
4954
4955 return (lwp_time);
4956 }
4957
4958 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4959 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4960 info_ptr->may_skip_backward = false; // elapsed time not wall time
4961 info_ptr->may_skip_forward = false; // elapsed time not wall time
4962 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4963 }
4964
4965 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4966 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4967 info_ptr->may_skip_backward = false; // elapsed time not wall time
4968 info_ptr->may_skip_forward = false; // elapsed time not wall time
4969 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4970 }
4971
4972 bool os::is_thread_cpu_time_supported() {
4973 return true;
4974 }
4975
4976 // System loadavg support. Returns -1 if load average cannot be obtained.
4977 // Return the load average for our processor set if the primitive exists
4978 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4979 int os::loadavg(double loadavg[], int nelem) {
4980 if (pset_getloadavg_ptr != NULL) {
4981 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4982 } else {
4983 return ::getloadavg(loadavg, nelem);
4984 }
4985 }
4986
4987 //---------------------------------------------------------------------------------
4988
4989 bool os::find(address addr, outputStream* st) {
4990 Dl_info dlinfo;
4991 memset(&dlinfo, 0, sizeof(dlinfo));
4992 if (dladdr(addr, &dlinfo) != 0) {
4993 st->print(PTR_FORMAT ": ", addr);
4994 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
4995 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
4996 } else if (dlinfo.dli_fbase != NULL) {
4997 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
4998 } else {
4999 st->print("<absolute address>");
5000 }
5001 if (dlinfo.dli_fname != NULL) {
5002 st->print(" in %s", dlinfo.dli_fname);
5003 }
5004 if (dlinfo.dli_fbase != NULL) {
5005 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5006 }
5007 st->cr();
5008
5009 if (Verbose) {
5010 // decode some bytes around the PC
5011 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5012 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5013 address lowest = (address) dlinfo.dli_sname;
5014 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5015 if (begin < lowest) begin = lowest;
5016 Dl_info dlinfo2;
5017 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5018 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
5019 end = (address) dlinfo2.dli_saddr;
5020 }
5021 Disassembler::decode(begin, end, st);
5022 }
5023 return true;
5024 }
5025 return false;
5026 }
5027
5028 // Following function has been added to support HotSparc's libjvm.so running
5029 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5030 // src/solaris/hpi/native_threads in the EVM codebase.
5031 //
5032 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5033 // libraries and should thus be removed. We will leave it behind for a while
5034 // until we no longer want to able to run on top of 1.3.0 Solaris production
5035 // JDK. See 4341971.
5036
5037 #define STACK_SLACK 0x800
5038
5039 extern "C" {
5040 intptr_t sysThreadAvailableStackWithSlack() {
5041 stack_t st;
5042 intptr_t retval, stack_top;
5043 retval = thr_stksegment(&st);
5044 assert(retval == 0, "incorrect return value from thr_stksegment");
5045 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5046 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5047 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5048 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5049 }
5050 }
5051
5052 // ObjectMonitor park-unpark infrastructure ...
5053 //
5054 // We implement Solaris and Linux PlatformEvents with the
5055 // obvious condvar-mutex-flag triple.
5056 // Another alternative that works quite well is pipes:
5057 // Each PlatformEvent consists of a pipe-pair.
5058 // The thread associated with the PlatformEvent
5059 // calls park(), which reads from the input end of the pipe.
5060 // Unpark() writes into the other end of the pipe.
5061 // The write-side of the pipe must be set NDELAY.
5062 // Unfortunately pipes consume a large # of handles.
5063 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5064 // Using pipes for the 1st few threads might be workable, however.
5065 //
5066 // park() is permitted to return spuriously.
5067 // Callers of park() should wrap the call to park() in
5068 // an appropriate loop. A litmus test for the correct
5069 // usage of park is the following: if park() were modified
5070 // to immediately return 0 your code should still work,
5071 // albeit degenerating to a spin loop.
5072 //
5073 // In a sense, park()-unpark() just provides more polite spinning
5074 // and polling with the key difference over naive spinning being
5075 // that a parked thread needs to be explicitly unparked() in order
5076 // to wake up and to poll the underlying condition.
5077 //
5078 // Assumption:
5079 // Only one parker can exist on an event, which is why we allocate
5080 // them per-thread. Multiple unparkers can coexist.
5081 //
5082 // _Event transitions in park()
5083 // -1 => -1 : illegal
5084 // 1 => 0 : pass - return immediately
5085 // 0 => -1 : block; then set _Event to 0 before returning
5086 //
5087 // _Event transitions in unpark()
5088 // 0 => 1 : just return
5089 // 1 => 1 : just return
5090 // -1 => either 0 or 1; must signal target thread
5091 // That is, we can safely transition _Event from -1 to either
5092 // 0 or 1.
5093 //
5094 // _Event serves as a restricted-range semaphore.
5095 // -1 : thread is blocked, i.e. there is a waiter
5096 // 0 : neutral: thread is running or ready,
5097 // could have been signaled after a wait started
5098 // 1 : signaled - thread is running or ready
5099 //
5100 // Another possible encoding of _Event would be with
5101 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5102 //
5103 // TODO-FIXME: add DTRACE probes for:
5104 // 1. Tx parks
5105 // 2. Ty unparks Tx
5106 // 3. Tx resumes from park
5107
5108
5109 // value determined through experimentation
5110 #define ROUNDINGFIX 11
5111
5112 // utility to compute the abstime argument to timedwait.
5113 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5114
5115 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5116 // millis is the relative timeout time
5117 // abstime will be the absolute timeout time
5118 if (millis < 0) millis = 0;
5119 struct timeval now;
5120 int status = gettimeofday(&now, NULL);
5121 assert(status == 0, "gettimeofday");
5122 jlong seconds = millis / 1000;
5123 jlong max_wait_period;
5124
5125 if (UseLWPSynchronization) {
5126 // forward port of fix for 4275818 (not sleeping long enough)
5127 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5128 // _lwp_cond_timedwait() used a round_down algorithm rather
5129 // than a round_up. For millis less than our roundfactor
5130 // it rounded down to 0 which doesn't meet the spec.
5131 // For millis > roundfactor we may return a bit sooner, but
5132 // since we can not accurately identify the patch level and
5133 // this has already been fixed in Solaris 9 and 8 we will
5134 // leave it alone rather than always rounding down.
5135
5136 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5137 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5138 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5139 max_wait_period = 21000000;
5140 } else {
5141 max_wait_period = 50000000;
5142 }
5143 millis %= 1000;
5144 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5145 seconds = max_wait_period;
5146 }
5147 abstime->tv_sec = now.tv_sec + seconds;
5148 long usec = now.tv_usec + millis * 1000;
5149 if (usec >= 1000000) {
5150 abstime->tv_sec += 1;
5151 usec -= 1000000;
5152 }
5153 abstime->tv_nsec = usec * 1000;
5154 return abstime;
5155 }
5156
5157 void os::PlatformEvent::park() { // AKA: down()
5158 // Transitions for _Event:
5159 // -1 => -1 : illegal
5160 // 1 => 0 : pass - return immediately
5161 // 0 => -1 : block; then set _Event to 0 before returning
5162
5163 // Invariant: Only the thread associated with the Event/PlatformEvent
5164 // may call park().
5165 assert(_nParked == 0, "invariant");
5166
5167 int v;
5168 for (;;) {
5169 v = _Event;
5170 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5171 }
5172 guarantee(v >= 0, "invariant");
5173 if (v == 0) {
5174 // Do this the hard way by blocking ...
5175 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5176 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5177 // Only for SPARC >= V8PlusA
5178 #if defined(__sparc) && defined(COMPILER2)
5179 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5180 #endif
5181 int status = os::Solaris::mutex_lock(_mutex);
5182 assert_status(status == 0, status, "mutex_lock");
5183 guarantee(_nParked == 0, "invariant");
5184 ++_nParked;
5185 while (_Event < 0) {
5186 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5187 // Treat this the same as if the wait was interrupted
5188 // With usr/lib/lwp going to kernel, always handle ETIME
5189 status = os::Solaris::cond_wait(_cond, _mutex);
5190 if (status == ETIME) status = EINTR;
5191 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5192 }
5193 --_nParked;
5194 _Event = 0;
5195 status = os::Solaris::mutex_unlock(_mutex);
5196 assert_status(status == 0, status, "mutex_unlock");
5197 // Paranoia to ensure our locked and lock-free paths interact
5198 // correctly with each other.
5199 OrderAccess::fence();
5200 }
5201 }
5202
5203 int os::PlatformEvent::park(jlong millis) {
5204 // Transitions for _Event:
5205 // -1 => -1 : illegal
5206 // 1 => 0 : pass - return immediately
5207 // 0 => -1 : block; then set _Event to 0 before returning
5208
5209 guarantee(_nParked == 0, "invariant");
5210 int v;
5211 for (;;) {
5212 v = _Event;
5213 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5214 }
5215 guarantee(v >= 0, "invariant");
5216 if (v != 0) return OS_OK;
5217
5218 int ret = OS_TIMEOUT;
5219 timestruc_t abst;
5220 compute_abstime(&abst, millis);
5221
5222 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5223 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5224 // Only for SPARC >= V8PlusA
5225 #if defined(__sparc) && defined(COMPILER2)
5226 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5227 #endif
5228 int status = os::Solaris::mutex_lock(_mutex);
5229 assert_status(status == 0, status, "mutex_lock");
5230 guarantee(_nParked == 0, "invariant");
5231 ++_nParked;
5232 while (_Event < 0) {
5233 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5234 assert_status(status == 0 || status == EINTR ||
5235 status == ETIME || status == ETIMEDOUT,
5236 status, "cond_timedwait");
5237 if (!FilterSpuriousWakeups) break; // previous semantics
5238 if (status == ETIME || status == ETIMEDOUT) break;
5239 // We consume and ignore EINTR and spurious wakeups.
5240 }
5241 --_nParked;
5242 if (_Event >= 0) ret = OS_OK;
5243 _Event = 0;
5244 status = os::Solaris::mutex_unlock(_mutex);
5245 assert_status(status == 0, status, "mutex_unlock");
5246 // Paranoia to ensure our locked and lock-free paths interact
5247 // correctly with each other.
5248 OrderAccess::fence();
5249 return ret;
5250 }
5251
5252 void os::PlatformEvent::unpark() {
5253 // Transitions for _Event:
5254 // 0 => 1 : just return
5255 // 1 => 1 : just return
5256 // -1 => either 0 or 1; must signal target thread
5257 // That is, we can safely transition _Event from -1 to either
5258 // 0 or 1.
5259 // See also: "Semaphores in Plan 9" by Mullender & Cox
5260 //
5261 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5262 // that it will take two back-to-back park() calls for the owning
5263 // thread to block. This has the benefit of forcing a spurious return
5264 // from the first park() call after an unpark() call which will help
5265 // shake out uses of park() and unpark() without condition variables.
5266
5267 if (Atomic::xchg(1, &_Event) >= 0) return;
5268
5269 // If the thread associated with the event was parked, wake it.
5270 // Wait for the thread assoc with the PlatformEvent to vacate.
5271 int status = os::Solaris::mutex_lock(_mutex);
5272 assert_status(status == 0, status, "mutex_lock");
5273 int AnyWaiters = _nParked;
5274 status = os::Solaris::mutex_unlock(_mutex);
5275 assert_status(status == 0, status, "mutex_unlock");
5276 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5277 if (AnyWaiters != 0) {
5278 // Note that we signal() *after* dropping the lock for "immortal" Events.
5279 // This is safe and avoids a common class of futile wakeups. In rare
5280 // circumstances this can cause a thread to return prematurely from
5281 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5282 // will simply re-test the condition and re-park itself.
5283 // This provides particular benefit if the underlying platform does not
5284 // provide wait morphing.
5285 status = os::Solaris::cond_signal(_cond);
5286 assert_status(status == 0, status, "cond_signal");
5287 }
5288 }
5289
5290 // JSR166
5291 // -------------------------------------------------------
5292
5293 // The solaris and linux implementations of park/unpark are fairly
5294 // conservative for now, but can be improved. They currently use a
5295 // mutex/condvar pair, plus _counter.
5296 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5297 // sets count to 1 and signals condvar. Only one thread ever waits
5298 // on the condvar. Contention seen when trying to park implies that someone
5299 // is unparking you, so don't wait. And spurious returns are fine, so there
5300 // is no need to track notifications.
5301
5302 #define MAX_SECS 100000000
5303
5304 // This code is common to linux and solaris and will be moved to a
5305 // common place in dolphin.
5306 //
5307 // The passed in time value is either a relative time in nanoseconds
5308 // or an absolute time in milliseconds. Either way it has to be unpacked
5309 // into suitable seconds and nanoseconds components and stored in the
5310 // given timespec structure.
5311 // Given time is a 64-bit value and the time_t used in the timespec is only
5312 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5313 // overflow if times way in the future are given. Further on Solaris versions
5314 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5315 // number of seconds, in abstime, is less than current_time + 100,000,000.
5316 // As it will be 28 years before "now + 100000000" will overflow we can
5317 // ignore overflow and just impose a hard-limit on seconds using the value
5318 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5319 // years from "now".
5320 //
5321 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5322 assert(time > 0, "convertTime");
5323
5324 struct timeval now;
5325 int status = gettimeofday(&now, NULL);
5326 assert(status == 0, "gettimeofday");
5327
5328 time_t max_secs = now.tv_sec + MAX_SECS;
5329
5330 if (isAbsolute) {
5331 jlong secs = time / 1000;
5332 if (secs > max_secs) {
5333 absTime->tv_sec = max_secs;
5334 } else {
5335 absTime->tv_sec = secs;
5336 }
5337 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5338 } else {
5339 jlong secs = time / NANOSECS_PER_SEC;
5340 if (secs >= MAX_SECS) {
5341 absTime->tv_sec = max_secs;
5342 absTime->tv_nsec = 0;
5343 } else {
5344 absTime->tv_sec = now.tv_sec + secs;
5345 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5346 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5347 absTime->tv_nsec -= NANOSECS_PER_SEC;
5348 ++absTime->tv_sec; // note: this must be <= max_secs
5349 }
5350 }
5351 }
5352 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5353 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5354 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5355 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5356 }
5357
5358 void Parker::park(bool isAbsolute, jlong time) {
5359 // Ideally we'd do something useful while spinning, such
5360 // as calling unpackTime().
5361
5362 // Optional fast-path check:
5363 // Return immediately if a permit is available.
5364 // We depend on Atomic::xchg() having full barrier semantics
5365 // since we are doing a lock-free update to _counter.
5366 if (Atomic::xchg(0, &_counter) > 0) return;
5367
5368 // Optional fast-exit: Check interrupt before trying to wait
5369 Thread* thread = Thread::current();
5370 assert(thread->is_Java_thread(), "Must be JavaThread");
5371 JavaThread *jt = (JavaThread *)thread;
5372 if (Thread::is_interrupted(thread, false)) {
5373 return;
5374 }
5375
5376 // First, demultiplex/decode time arguments
5377 timespec absTime;
5378 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5379 return;
5380 }
5381 if (time > 0) {
5382 // Warning: this code might be exposed to the old Solaris time
5383 // round-down bugs. Grep "roundingFix" for details.
5384 unpackTime(&absTime, isAbsolute, time);
5385 }
5386
5387 // Enter safepoint region
5388 // Beware of deadlocks such as 6317397.
5389 // The per-thread Parker:: _mutex is a classic leaf-lock.
5390 // In particular a thread must never block on the Threads_lock while
5391 // holding the Parker:: mutex. If safepoints are pending both the
5392 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5393 ThreadBlockInVM tbivm(jt);
5394
5395 // Don't wait if cannot get lock since interference arises from
5396 // unblocking. Also. check interrupt before trying wait
5397 if (Thread::is_interrupted(thread, false) ||
5398 os::Solaris::mutex_trylock(_mutex) != 0) {
5399 return;
5400 }
5401
5402 int status;
5403
5404 if (_counter > 0) { // no wait needed
5405 _counter = 0;
5406 status = os::Solaris::mutex_unlock(_mutex);
5407 assert(status == 0, "invariant");
5408 // Paranoia to ensure our locked and lock-free paths interact
5409 // correctly with each other and Java-level accesses.
5410 OrderAccess::fence();
5411 return;
5412 }
5413
5414 #ifdef ASSERT
5415 // Don't catch signals while blocked; let the running threads have the signals.
5416 // (This allows a debugger to break into the running thread.)
5417 sigset_t oldsigs;
5418 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5419 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5420 #endif
5421
5422 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5423 jt->set_suspend_equivalent();
5424 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5425
5426 // Do this the hard way by blocking ...
5427 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5428 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5429 // Only for SPARC >= V8PlusA
5430 #if defined(__sparc) && defined(COMPILER2)
5431 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5432 #endif
5433
5434 if (time == 0) {
5435 status = os::Solaris::cond_wait(_cond, _mutex);
5436 } else {
5437 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5438 }
5439 // Note that an untimed cond_wait() can sometimes return ETIME on older
5440 // versions of the Solaris.
5441 assert_status(status == 0 || status == EINTR ||
5442 status == ETIME || status == ETIMEDOUT,
5443 status, "cond_timedwait");
5444
5445 #ifdef ASSERT
5446 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
5447 #endif
5448 _counter = 0;
5449 status = os::Solaris::mutex_unlock(_mutex);
5450 assert_status(status == 0, status, "mutex_unlock");
5451 // Paranoia to ensure our locked and lock-free paths interact
5452 // correctly with each other and Java-level accesses.
5453 OrderAccess::fence();
5454
5455 // If externally suspended while waiting, re-suspend
5456 if (jt->handle_special_suspend_equivalent_condition()) {
5457 jt->java_suspend_self();
5458 }
5459 }
5460
5461 void Parker::unpark() {
5462 int status = os::Solaris::mutex_lock(_mutex);
5463 assert(status == 0, "invariant");
5464 const int s = _counter;
5465 _counter = 1;
5466 status = os::Solaris::mutex_unlock(_mutex);
5467 assert(status == 0, "invariant");
5468
5469 if (s < 1) {
5470 status = os::Solaris::cond_signal(_cond);
5471 assert(status == 0, "invariant");
5472 }
5473 }
5474
5475 extern char** environ;
5476
5477 // Run the specified command in a separate process. Return its exit value,
5478 // or -1 on failure (e.g. can't fork a new process).
5479 // Unlike system(), this function can be called from signal handler. It
5480 // doesn't block SIGINT et al.
5481 int os::fork_and_exec(char* cmd) {
5482 char * argv[4];
5483 argv[0] = (char *)"sh";
5484 argv[1] = (char *)"-c";
5485 argv[2] = cmd;
5486 argv[3] = NULL;
5487
5488 // fork is async-safe, fork1 is not so can't use in signal handler
5489 pid_t pid;
5490 Thread* t = Thread::current_or_null_safe();
5491 if (t != NULL && t->is_inside_signal_handler()) {
5492 pid = fork();
5493 } else {
5494 pid = fork1();
5495 }
5496
5497 if (pid < 0) {
5498 // fork failed
5499 warning("fork failed: %s", os::strerror(errno));
5500 return -1;
5501
5502 } else if (pid == 0) {
5503 // child process
5504
5505 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5506 execve("/usr/bin/sh", argv, environ);
5507
5508 // execve failed
5509 _exit(-1);
5510
5511 } else {
5512 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5513 // care about the actual exit code, for now.
5514
5515 int status;
5516
5517 // Wait for the child process to exit. This returns immediately if
5518 // the child has already exited. */
5519 while (waitpid(pid, &status, 0) < 0) {
5520 switch (errno) {
5521 case ECHILD: return 0;
5522 case EINTR: break;
5523 default: return -1;
5524 }
5525 }
5526
5527 if (WIFEXITED(status)) {
5528 // The child exited normally; get its exit code.
5529 return WEXITSTATUS(status);
5530 } else if (WIFSIGNALED(status)) {
5531 // The child exited because of a signal
5532 // The best value to return is 0x80 + signal number,
5533 // because that is what all Unix shells do, and because
5534 // it allows callers to distinguish between process exit and
5535 // process death by signal.
5536 return 0x80 + WTERMSIG(status);
5537 } else {
5538 // Unknown exit code; pass it through
5539 return status;
5540 }
5541 }
5542 }
5543
5544 // is_headless_jre()
5545 //
5546 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5547 // in order to report if we are running in a headless jre
5548 //
5549 // Since JDK8 xawt/libmawt.so was moved into the same directory
5550 // as libawt.so, and renamed libawt_xawt.so
5551 //
5552 bool os::is_headless_jre() {
5553 struct stat statbuf;
5554 char buf[MAXPATHLEN];
5555 char libmawtpath[MAXPATHLEN];
5556 const char *xawtstr = "/xawt/libmawt.so";
5557 const char *new_xawtstr = "/libawt_xawt.so";
5558 char *p;
5559
5560 // Get path to libjvm.so
5561 os::jvm_path(buf, sizeof(buf));
5562
5563 // Get rid of libjvm.so
5564 p = strrchr(buf, '/');
5565 if (p == NULL) {
5566 return false;
5567 } else {
5568 *p = '\0';
5569 }
5570
5571 // Get rid of client or server
5572 p = strrchr(buf, '/');
5573 if (p == NULL) {
5574 return false;
5575 } else {
5576 *p = '\0';
5577 }
5578
5579 // check xawt/libmawt.so
5580 strcpy(libmawtpath, buf);
5581 strcat(libmawtpath, xawtstr);
5582 if (::stat(libmawtpath, &statbuf) == 0) return false;
5583
5584 // check libawt_xawt.so
5585 strcpy(libmawtpath, buf);
5586 strcat(libmawtpath, new_xawtstr);
5587 if (::stat(libmawtpath, &statbuf) == 0) return false;
5588
5589 return true;
5590 }
5591
5592 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5593 size_t res;
5594 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5595 return res;
5596 }
5597
5598 int os::close(int fd) {
5599 return ::close(fd);
5600 }
5601
5602 int os::socket_close(int fd) {
5603 return ::close(fd);
5604 }
5605
5606 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5607 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5608 "Assumed _thread_in_native");
5609 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5610 }
5611
5612 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5613 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5614 "Assumed _thread_in_native");
5615 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5616 }
5617
5618 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5619 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5620 }
5621
5622 // As both poll and select can be interrupted by signals, we have to be
5623 // prepared to restart the system call after updating the timeout, unless
5624 // a poll() is done with timeout == -1, in which case we repeat with this
5625 // "wait forever" value.
5626
5627 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5628 int _result;
5629 _result = ::connect(fd, him, len);
5630
5631 // On Solaris, when a connect() call is interrupted, the connection
5632 // can be established asynchronously (see 6343810). Subsequent calls
5633 // to connect() must check the errno value which has the semantic
5634 // described below (copied from the connect() man page). Handling
5635 // of asynchronously established connections is required for both
5636 // blocking and non-blocking sockets.
5637 // EINTR The connection attempt was interrupted
5638 // before any data arrived by the delivery of
5639 // a signal. The connection, however, will be
5640 // established asynchronously.
5641 //
5642 // EINPROGRESS The socket is non-blocking, and the connec-
5643 // tion cannot be completed immediately.
5644 //
5645 // EALREADY The socket is non-blocking, and a previous
5646 // connection attempt has not yet been com-
5647 // pleted.
5648 //
5649 // EISCONN The socket is already connected.
5650 if (_result == OS_ERR && errno == EINTR) {
5651 // restarting a connect() changes its errno semantics
5652 RESTARTABLE(::connect(fd, him, len), _result);
5653 // undo these changes
5654 if (_result == OS_ERR) {
5655 if (errno == EALREADY) {
5656 errno = EINPROGRESS; // fall through
5657 } else if (errno == EISCONN) {
5658 errno = 0;
5659 return OS_OK;
5660 }
5661 }
5662 }
5663 return _result;
5664 }
5665
5666 // Get the default path to the core file
5667 // Returns the length of the string
5668 int os::get_core_path(char* buffer, size_t bufferSize) {
5669 const char* p = get_current_directory(buffer, bufferSize);
5670
5671 if (p == NULL) {
5672 assert(p != NULL, "failed to get current directory");
5673 return 0;
5674 }
5675
5676 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5677 p, current_process_id());
5678
5679 return strlen(buffer);
5680 }
5681
5682 #ifndef PRODUCT
5683 void TestReserveMemorySpecial_test() {
5684 // No tests available for this platform
5685 }
5686 #endif
5687
5688 bool os::start_debugging(char *buf, int buflen) {
5689 int len = (int)strlen(buf);
5690 char *p = &buf[len];
5691
5692 jio_snprintf(p, buflen-len,
5693 "\n\n"
5694 "Do you want to debug the problem?\n\n"
5695 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5696 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5697 "Otherwise, press RETURN to abort...",
5698 os::current_process_id(), os::current_thread_id());
5699
5700 bool yes = os::message_box("Unexpected Error", buf);
5701
5702 if (yes) {
5703 // yes, user asked VM to launch debugger
5704 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5705
5706 os::fork_and_exec(buf);
5707 yes = false;
5708 }
5709 return yes;
5710 }