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 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2038 return;
2039 }
2040 } else {
2041 buf[0] = '\0';
2042 return;
2043 }
2044
2045 if (Arguments::sun_java_launcher_is_altjvm()) {
2046 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2047 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2048 // If "/jre/lib/" appears at the right place in the string, then
2049 // assume we are installed in a JDK and we're done. Otherwise, check
2050 // for a JAVA_HOME environment variable and fix up the path so it
2051 // looks like libjvm.so is installed there (append a fake suffix
2052 // hotspot/libjvm.so).
2053 const char *p = buf + strlen(buf) - 1;
2054 for (int count = 0; p > buf && count < 5; ++count) {
2055 for (--p; p > buf && *p != '/'; --p)
2056 /* empty */ ;
2057 }
2058
2059 if (strncmp(p, "/jre/lib/", 9) != 0) {
2060 // Look for JAVA_HOME in the environment.
2061 char* java_home_var = ::getenv("JAVA_HOME");
2062 if (java_home_var != NULL && java_home_var[0] != 0) {
2063 char* jrelib_p;
2064 int len;
2065
2066 // Check the current module name "libjvm.so".
2067 p = strrchr(buf, '/');
2068 assert(strstr(p, "/libjvm") == p, "invalid library name");
2069
2070 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) {
2071 return;
2072 }
2073 // determine if this is a legacy image or modules image
2074 // modules image doesn't have "jre" subdirectory
2075 len = strlen(buf);
2076 assert(len < buflen, "Ran out of buffer space");
2077 jrelib_p = buf + len;
2078 snprintf(jrelib_p, buflen-len, "/jre/lib");
2079 if (0 != access(buf, F_OK)) {
2080 snprintf(jrelib_p, buflen-len, "/lib");
2081 }
2082
2083 if (0 == access(buf, F_OK)) {
2084 // Use current module name "libjvm.so"
2085 len = strlen(buf);
2086 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2087 } else {
2088 // Go back to path of .so
2089 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) {
2090 return;
2091 }
2092 }
2093 }
2094 }
2095 }
2096
2097 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2098 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2099 }
2100
2101
2102 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2103 // no prefix required, not even "_"
2104 }
2105
2106
2107 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2108 // no suffix required
2109 }
2110
2111 // This method is a copy of JDK's sysGetLastErrorString
2112 // from src/solaris/hpi/src/system_md.c
2113
2114 size_t os::lasterror(char *buf, size_t len) {
2115 if (errno == 0) return 0;
2116
2117 const char *s = os::strerror(errno);
2118 size_t n = ::strlen(s);
2119 if (n >= len) {
2120 n = len - 1;
2121 }
2122 ::strncpy(buf, s, n);
2123 buf[n] = '\0';
2124 return n;
2125 }
2126
2127
2128 // sun.misc.Signal
2129
2130 extern "C" {
2131 static void UserHandler(int sig, void *siginfo, void *context) {
2132 // Ctrl-C is pressed during error reporting, likely because the error
2133 // handler fails to abort. Let VM die immediately.
2134 if (sig == SIGINT && is_error_reported()) {
2135 os::die();
2136 }
2137
2138 os::signal_notify(sig);
2139 // We do not need to reinstate the signal handler each time...
2140 }
2141 }
2142
2143 void* os::user_handler() {
2144 return CAST_FROM_FN_PTR(void*, UserHandler);
2145 }
2146
2147 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2148 struct timespec ts;
2149 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2150
2151 return ts;
2152 }
2153
2154 extern "C" {
2155 typedef void (*sa_handler_t)(int);
2156 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2157 }
2158
2159 void* os::signal(int signal_number, void* handler) {
2160 struct sigaction sigAct, oldSigAct;
2161 sigfillset(&(sigAct.sa_mask));
2162 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2163 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2164
2165 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2166 // -1 means registration failed
2167 return (void *)-1;
2168 }
2169
2170 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2171 }
2172
2173 void os::signal_raise(int signal_number) {
2174 raise(signal_number);
2175 }
2176
2177 // The following code is moved from os.cpp for making this
2178 // code platform specific, which it is by its very nature.
2179
2180 // a counter for each possible signal value
2181 static int Sigexit = 0;
2182 static int Maxlibjsigsigs;
2183 static jint *pending_signals = NULL;
2184 static int *preinstalled_sigs = NULL;
2185 static struct sigaction *chainedsigactions = NULL;
2186 static sema_t sig_sem;
2187 typedef int (*version_getting_t)();
2188 version_getting_t os::Solaris::get_libjsig_version = NULL;
2189 static int libjsigversion = NULL;
2190
2191 int os::sigexitnum_pd() {
2192 assert(Sigexit > 0, "signal memory not yet initialized");
2193 return Sigexit;
2194 }
2195
2196 void os::Solaris::init_signal_mem() {
2197 // Initialize signal structures
2198 Maxsignum = SIGRTMAX;
2199 Sigexit = Maxsignum+1;
2200 assert(Maxsignum >0, "Unable to obtain max signal number");
2201
2202 Maxlibjsigsigs = Maxsignum;
2203
2204 // pending_signals has one int per signal
2205 // The additional signal is for SIGEXIT - exit signal to signal_thread
2206 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2207 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2208
2209 if (UseSignalChaining) {
2210 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2211 * (Maxsignum + 1), mtInternal);
2212 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2213 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2214 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2215 }
2216 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2217 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2218 }
2219
2220 void os::signal_init_pd() {
2221 int ret;
2222
2223 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2224 assert(ret == 0, "sema_init() failed");
2225 }
2226
2227 void os::signal_notify(int signal_number) {
2228 int ret;
2229
2230 Atomic::inc(&pending_signals[signal_number]);
2231 ret = ::sema_post(&sig_sem);
2232 assert(ret == 0, "sema_post() failed");
2233 }
2234
2235 static int check_pending_signals(bool wait_for_signal) {
2236 int ret;
2237 while (true) {
2238 for (int i = 0; i < Sigexit + 1; i++) {
2239 jint n = pending_signals[i];
2240 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2241 return i;
2242 }
2243 }
2244 if (!wait_for_signal) {
2245 return -1;
2246 }
2247 JavaThread *thread = JavaThread::current();
2248 ThreadBlockInVM tbivm(thread);
2249
2250 bool threadIsSuspended;
2251 do {
2252 thread->set_suspend_equivalent();
2253 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2254 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2255 ;
2256 assert(ret == 0, "sema_wait() failed");
2257
2258 // were we externally suspended while we were waiting?
2259 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2260 if (threadIsSuspended) {
2261 // The semaphore has been incremented, but while we were waiting
2262 // another thread suspended us. We don't want to continue running
2263 // while suspended because that would surprise the thread that
2264 // suspended us.
2265 ret = ::sema_post(&sig_sem);
2266 assert(ret == 0, "sema_post() failed");
2267
2268 thread->java_suspend_self();
2269 }
2270 } while (threadIsSuspended);
2271 }
2272 }
2273
2274 int os::signal_lookup() {
2275 return check_pending_signals(false);
2276 }
2277
2278 int os::signal_wait() {
2279 return check_pending_signals(true);
2280 }
2281
2282 ////////////////////////////////////////////////////////////////////////////////
2283 // Virtual Memory
2284
2285 static int page_size = -1;
2286
2287 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2288 // clear this var if support is not available.
2289 static bool has_map_align = true;
2290
2291 int os::vm_page_size() {
2292 assert(page_size != -1, "must call os::init");
2293 return page_size;
2294 }
2295
2296 // Solaris allocates memory by pages.
2297 int os::vm_allocation_granularity() {
2298 assert(page_size != -1, "must call os::init");
2299 return page_size;
2300 }
2301
2302 static bool recoverable_mmap_error(int err) {
2303 // See if the error is one we can let the caller handle. This
2304 // list of errno values comes from the Solaris mmap(2) man page.
2305 switch (err) {
2306 case EBADF:
2307 case EINVAL:
2308 case ENOTSUP:
2309 // let the caller deal with these errors
2310 return true;
2311
2312 default:
2313 // Any remaining errors on this OS can cause our reserved mapping
2314 // to be lost. That can cause confusion where different data
2315 // structures think they have the same memory mapped. The worst
2316 // scenario is if both the VM and a library think they have the
2317 // same memory mapped.
2318 return false;
2319 }
2320 }
2321
2322 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2323 int err) {
2324 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2325 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2326 os::strerror(err), err);
2327 }
2328
2329 static void warn_fail_commit_memory(char* addr, size_t bytes,
2330 size_t alignment_hint, bool exec,
2331 int err) {
2332 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2333 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2334 alignment_hint, exec, os::strerror(err), err);
2335 }
2336
2337 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2338 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2339 size_t size = bytes;
2340 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2341 if (res != NULL) {
2342 if (UseNUMAInterleaving) {
2343 numa_make_global(addr, bytes);
2344 }
2345 return 0;
2346 }
2347
2348 int err = errno; // save errno from mmap() call in mmap_chunk()
2349
2350 if (!recoverable_mmap_error(err)) {
2351 warn_fail_commit_memory(addr, bytes, exec, err);
2352 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2353 }
2354
2355 return err;
2356 }
2357
2358 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2359 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2360 }
2361
2362 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2363 const char* mesg) {
2364 assert(mesg != NULL, "mesg must be specified");
2365 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2366 if (err != 0) {
2367 // the caller wants all commit errors to exit with the specified mesg:
2368 warn_fail_commit_memory(addr, bytes, exec, err);
2369 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2370 }
2371 }
2372
2373 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2374 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2375 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2376 alignment, (size_t) vm_page_size());
2377
2378 for (int i = 0; _page_sizes[i] != 0; i++) {
2379 if (is_size_aligned(alignment, _page_sizes[i])) {
2380 return _page_sizes[i];
2381 }
2382 }
2383
2384 return (size_t) vm_page_size();
2385 }
2386
2387 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2388 size_t alignment_hint, bool exec) {
2389 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2390 if (err == 0 && UseLargePages && alignment_hint > 0) {
2391 assert(is_size_aligned(bytes, alignment_hint),
2392 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2393
2394 // The syscall memcntl requires an exact page size (see man memcntl for details).
2395 size_t page_size = page_size_for_alignment(alignment_hint);
2396 if (page_size > (size_t) vm_page_size()) {
2397 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2398 }
2399 }
2400 return err;
2401 }
2402
2403 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2404 bool exec) {
2405 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2406 }
2407
2408 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2409 size_t alignment_hint, bool exec,
2410 const char* mesg) {
2411 assert(mesg != NULL, "mesg must be specified");
2412 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2413 if (err != 0) {
2414 // the caller wants all commit errors to exit with the specified mesg:
2415 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2416 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2417 }
2418 }
2419
2420 // Uncommit the pages in a specified region.
2421 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2422 if (madvise(addr, bytes, MADV_FREE) < 0) {
2423 debug_only(warning("MADV_FREE failed."));
2424 return;
2425 }
2426 }
2427
2428 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2429 return os::commit_memory(addr, size, !ExecMem);
2430 }
2431
2432 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2433 return os::uncommit_memory(addr, size);
2434 }
2435
2436 // Change the page size in a given range.
2437 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2438 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2439 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2440 if (UseLargePages) {
2441 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2442 if (page_size > (size_t) vm_page_size()) {
2443 Solaris::setup_large_pages(addr, bytes, page_size);
2444 }
2445 }
2446 }
2447
2448 // Tell the OS to make the range local to the first-touching LWP
2449 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2450 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2451 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2452 debug_only(warning("MADV_ACCESS_LWP failed."));
2453 }
2454 }
2455
2456 // Tell the OS that this range would be accessed from different LWPs.
2457 void os::numa_make_global(char *addr, size_t bytes) {
2458 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2459 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2460 debug_only(warning("MADV_ACCESS_MANY failed."));
2461 }
2462 }
2463
2464 // Get the number of the locality groups.
2465 size_t os::numa_get_groups_num() {
2466 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2467 return n != -1 ? n : 1;
2468 }
2469
2470 // Get a list of leaf locality groups. A leaf lgroup is group that
2471 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2472 // board. An LWP is assigned to one of these groups upon creation.
2473 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2474 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2475 ids[0] = 0;
2476 return 1;
2477 }
2478 int result_size = 0, top = 1, bottom = 0, cur = 0;
2479 for (int k = 0; k < size; k++) {
2480 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2481 (Solaris::lgrp_id_t*)&ids[top], size - top);
2482 if (r == -1) {
2483 ids[0] = 0;
2484 return 1;
2485 }
2486 if (!r) {
2487 // That's a leaf node.
2488 assert(bottom <= cur, "Sanity check");
2489 // Check if the node has memory
2490 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2491 NULL, 0, LGRP_RSRC_MEM) > 0) {
2492 ids[bottom++] = ids[cur];
2493 }
2494 }
2495 top += r;
2496 cur++;
2497 }
2498 if (bottom == 0) {
2499 // Handle a situation, when the OS reports no memory available.
2500 // Assume UMA architecture.
2501 ids[0] = 0;
2502 return 1;
2503 }
2504 return bottom;
2505 }
2506
2507 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2508 bool os::numa_topology_changed() {
2509 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2510 if (is_stale != -1 && is_stale) {
2511 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2512 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2513 assert(c != 0, "Failure to initialize LGRP API");
2514 Solaris::set_lgrp_cookie(c);
2515 return true;
2516 }
2517 return false;
2518 }
2519
2520 // Get the group id of the current LWP.
2521 int os::numa_get_group_id() {
2522 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2523 if (lgrp_id == -1) {
2524 return 0;
2525 }
2526 const int size = os::numa_get_groups_num();
2527 int *ids = (int*)alloca(size * sizeof(int));
2528
2529 // Get the ids of all lgroups with memory; r is the count.
2530 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2531 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2532 if (r <= 0) {
2533 return 0;
2534 }
2535 return ids[os::random() % r];
2536 }
2537
2538 // Request information about the page.
2539 bool os::get_page_info(char *start, page_info* info) {
2540 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2541 uint64_t addr = (uintptr_t)start;
2542 uint64_t outdata[2];
2543 uint_t validity = 0;
2544
2545 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2546 return false;
2547 }
2548
2549 info->size = 0;
2550 info->lgrp_id = -1;
2551
2552 if ((validity & 1) != 0) {
2553 if ((validity & 2) != 0) {
2554 info->lgrp_id = outdata[0];
2555 }
2556 if ((validity & 4) != 0) {
2557 info->size = outdata[1];
2558 }
2559 return true;
2560 }
2561 return false;
2562 }
2563
2564 // Scan the pages from start to end until a page different than
2565 // the one described in the info parameter is encountered.
2566 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2567 page_info* page_found) {
2568 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2569 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2570 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2571 uint_t validity[MAX_MEMINFO_CNT];
2572
2573 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2574 uint64_t p = (uint64_t)start;
2575 while (p < (uint64_t)end) {
2576 addrs[0] = p;
2577 size_t addrs_count = 1;
2578 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2579 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2580 addrs_count++;
2581 }
2582
2583 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2584 return NULL;
2585 }
2586
2587 size_t i = 0;
2588 for (; i < addrs_count; i++) {
2589 if ((validity[i] & 1) != 0) {
2590 if ((validity[i] & 4) != 0) {
2591 if (outdata[types * i + 1] != page_expected->size) {
2592 break;
2593 }
2594 } else if (page_expected->size != 0) {
2595 break;
2596 }
2597
2598 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2599 if (outdata[types * i] != page_expected->lgrp_id) {
2600 break;
2601 }
2602 }
2603 } else {
2604 return NULL;
2605 }
2606 }
2607
2608 if (i < addrs_count) {
2609 if ((validity[i] & 2) != 0) {
2610 page_found->lgrp_id = outdata[types * i];
2611 } else {
2612 page_found->lgrp_id = -1;
2613 }
2614 if ((validity[i] & 4) != 0) {
2615 page_found->size = outdata[types * i + 1];
2616 } else {
2617 page_found->size = 0;
2618 }
2619 return (char*)addrs[i];
2620 }
2621
2622 p = addrs[addrs_count - 1] + page_size;
2623 }
2624 return end;
2625 }
2626
2627 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2628 size_t size = bytes;
2629 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2630 // uncommitted page. Otherwise, the read/write might succeed if we
2631 // have enough swap space to back the physical page.
2632 return
2633 NULL != Solaris::mmap_chunk(addr, size,
2634 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2635 PROT_NONE);
2636 }
2637
2638 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2639 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2640
2641 if (b == MAP_FAILED) {
2642 return NULL;
2643 }
2644 return b;
2645 }
2646
2647 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2648 size_t alignment_hint, bool fixed) {
2649 char* addr = requested_addr;
2650 int flags = MAP_PRIVATE | MAP_NORESERVE;
2651
2652 assert(!(fixed && (alignment_hint > 0)),
2653 "alignment hint meaningless with fixed mmap");
2654
2655 if (fixed) {
2656 flags |= MAP_FIXED;
2657 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2658 flags |= MAP_ALIGN;
2659 addr = (char*) alignment_hint;
2660 }
2661
2662 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2663 // uncommitted page. Otherwise, the read/write might succeed if we
2664 // have enough swap space to back the physical page.
2665 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2666 }
2667
2668 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2669 size_t alignment_hint) {
2670 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2671 (requested_addr != NULL));
2672
2673 guarantee(requested_addr == NULL || requested_addr == addr,
2674 "OS failed to return requested mmap address.");
2675 return addr;
2676 }
2677
2678 // Reserve memory at an arbitrary address, only if that area is
2679 // available (and not reserved for something else).
2680
2681 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2682 const int max_tries = 10;
2683 char* base[max_tries];
2684 size_t size[max_tries];
2685
2686 // Solaris adds a gap between mmap'ed regions. The size of the gap
2687 // is dependent on the requested size and the MMU. Our initial gap
2688 // value here is just a guess and will be corrected later.
2689 bool had_top_overlap = false;
2690 bool have_adjusted_gap = false;
2691 size_t gap = 0x400000;
2692
2693 // Assert only that the size is a multiple of the page size, since
2694 // that's all that mmap requires, and since that's all we really know
2695 // about at this low abstraction level. If we need higher alignment,
2696 // we can either pass an alignment to this method or verify alignment
2697 // in one of the methods further up the call chain. See bug 5044738.
2698 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2699
2700 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2701 // Give it a try, if the kernel honors the hint we can return immediately.
2702 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2703
2704 volatile int err = errno;
2705 if (addr == requested_addr) {
2706 return addr;
2707 } else if (addr != NULL) {
2708 pd_unmap_memory(addr, bytes);
2709 }
2710
2711 if (log_is_enabled(Warning, os)) {
2712 char buf[256];
2713 buf[0] = '\0';
2714 if (addr == NULL) {
2715 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2716 }
2717 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2718 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2719 "%s", bytes, requested_addr, addr, buf);
2720 }
2721
2722 // Address hint method didn't work. Fall back to the old method.
2723 // In theory, once SNV becomes our oldest supported platform, this
2724 // code will no longer be needed.
2725 //
2726 // Repeatedly allocate blocks until the block is allocated at the
2727 // right spot. Give up after max_tries.
2728 int i;
2729 for (i = 0; i < max_tries; ++i) {
2730 base[i] = reserve_memory(bytes);
2731
2732 if (base[i] != NULL) {
2733 // Is this the block we wanted?
2734 if (base[i] == requested_addr) {
2735 size[i] = bytes;
2736 break;
2737 }
2738
2739 // check that the gap value is right
2740 if (had_top_overlap && !have_adjusted_gap) {
2741 size_t actual_gap = base[i-1] - base[i] - bytes;
2742 if (gap != actual_gap) {
2743 // adjust the gap value and retry the last 2 allocations
2744 assert(i > 0, "gap adjustment code problem");
2745 have_adjusted_gap = true; // adjust the gap only once, just in case
2746 gap = actual_gap;
2747 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2748 unmap_memory(base[i], bytes);
2749 unmap_memory(base[i-1], size[i-1]);
2750 i-=2;
2751 continue;
2752 }
2753 }
2754
2755 // Does this overlap the block we wanted? Give back the overlapped
2756 // parts and try again.
2757 //
2758 // There is still a bug in this code: if top_overlap == bytes,
2759 // the overlap is offset from requested region by the value of gap.
2760 // In this case giving back the overlapped part will not work,
2761 // because we'll give back the entire block at base[i] and
2762 // therefore the subsequent allocation will not generate a new gap.
2763 // This could be fixed with a new algorithm that used larger
2764 // or variable size chunks to find the requested region -
2765 // but such a change would introduce additional complications.
2766 // It's rare enough that the planets align for this bug,
2767 // so we'll just wait for a fix for 6204603/5003415 which
2768 // will provide a mmap flag to allow us to avoid this business.
2769
2770 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2771 if (top_overlap >= 0 && top_overlap < bytes) {
2772 had_top_overlap = true;
2773 unmap_memory(base[i], top_overlap);
2774 base[i] += top_overlap;
2775 size[i] = bytes - top_overlap;
2776 } else {
2777 size_t bottom_overlap = base[i] + bytes - requested_addr;
2778 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2779 if (bottom_overlap == 0) {
2780 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2781 }
2782 unmap_memory(requested_addr, bottom_overlap);
2783 size[i] = bytes - bottom_overlap;
2784 } else {
2785 size[i] = bytes;
2786 }
2787 }
2788 }
2789 }
2790
2791 // Give back the unused reserved pieces.
2792
2793 for (int j = 0; j < i; ++j) {
2794 if (base[j] != NULL) {
2795 unmap_memory(base[j], size[j]);
2796 }
2797 }
2798
2799 return (i < max_tries) ? requested_addr : NULL;
2800 }
2801
2802 bool os::pd_release_memory(char* addr, size_t bytes) {
2803 size_t size = bytes;
2804 return munmap(addr, size) == 0;
2805 }
2806
2807 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2808 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2809 "addr must be page aligned");
2810 int retVal = mprotect(addr, bytes, prot);
2811 return retVal == 0;
2812 }
2813
2814 // Protect memory (Used to pass readonly pages through
2815 // JNI GetArray<type>Elements with empty arrays.)
2816 // Also, used for serialization page and for compressed oops null pointer
2817 // checking.
2818 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2819 bool is_committed) {
2820 unsigned int p = 0;
2821 switch (prot) {
2822 case MEM_PROT_NONE: p = PROT_NONE; break;
2823 case MEM_PROT_READ: p = PROT_READ; break;
2824 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2825 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2826 default:
2827 ShouldNotReachHere();
2828 }
2829 // is_committed is unused.
2830 return solaris_mprotect(addr, bytes, p);
2831 }
2832
2833 // guard_memory and unguard_memory only happens within stack guard pages.
2834 // Since ISM pertains only to the heap, guard and unguard memory should not
2835 /// happen with an ISM region.
2836 bool os::guard_memory(char* addr, size_t bytes) {
2837 return solaris_mprotect(addr, bytes, PROT_NONE);
2838 }
2839
2840 bool os::unguard_memory(char* addr, size_t bytes) {
2841 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2842 }
2843
2844 // Large page support
2845 static size_t _large_page_size = 0;
2846
2847 // Insertion sort for small arrays (descending order).
2848 static void insertion_sort_descending(size_t* array, int len) {
2849 for (int i = 0; i < len; i++) {
2850 size_t val = array[i];
2851 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2852 size_t tmp = array[key];
2853 array[key] = array[key - 1];
2854 array[key - 1] = tmp;
2855 }
2856 }
2857 }
2858
2859 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2860 const unsigned int usable_count = VM_Version::page_size_count();
2861 if (usable_count == 1) {
2862 return false;
2863 }
2864
2865 // Find the right getpagesizes interface. When solaris 11 is the minimum
2866 // build platform, getpagesizes() (without the '2') can be called directly.
2867 typedef int (*gps_t)(size_t[], int);
2868 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2869 if (gps_func == NULL) {
2870 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2871 if (gps_func == NULL) {
2872 if (warn) {
2873 warning("MPSS is not supported by the operating system.");
2874 }
2875 return false;
2876 }
2877 }
2878
2879 // Fill the array of page sizes.
2880 int n = (*gps_func)(_page_sizes, page_sizes_max);
2881 assert(n > 0, "Solaris bug?");
2882
2883 if (n == page_sizes_max) {
2884 // Add a sentinel value (necessary only if the array was completely filled
2885 // since it is static (zeroed at initialization)).
2886 _page_sizes[--n] = 0;
2887 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2888 }
2889 assert(_page_sizes[n] == 0, "missing sentinel");
2890 trace_page_sizes("available page sizes", _page_sizes, n);
2891
2892 if (n == 1) return false; // Only one page size available.
2893
2894 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2895 // select up to usable_count elements. First sort the array, find the first
2896 // acceptable value, then copy the usable sizes to the top of the array and
2897 // trim the rest. Make sure to include the default page size :-).
2898 //
2899 // A better policy could get rid of the 4M limit by taking the sizes of the
2900 // important VM memory regions (java heap and possibly the code cache) into
2901 // account.
2902 insertion_sort_descending(_page_sizes, n);
2903 const size_t size_limit =
2904 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2905 int beg;
2906 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2907 const int end = MIN2((int)usable_count, n) - 1;
2908 for (int cur = 0; cur < end; ++cur, ++beg) {
2909 _page_sizes[cur] = _page_sizes[beg];
2910 }
2911 _page_sizes[end] = vm_page_size();
2912 _page_sizes[end + 1] = 0;
2913
2914 if (_page_sizes[end] > _page_sizes[end - 1]) {
2915 // Default page size is not the smallest; sort again.
2916 insertion_sort_descending(_page_sizes, end + 1);
2917 }
2918 *page_size = _page_sizes[0];
2919
2920 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2921 return true;
2922 }
2923
2924 void os::large_page_init() {
2925 if (UseLargePages) {
2926 // print a warning if any large page related flag is specified on command line
2927 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2928 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2929
2930 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2931 }
2932 }
2933
2934 bool os::Solaris::is_valid_page_size(size_t bytes) {
2935 for (int i = 0; _page_sizes[i] != 0; i++) {
2936 if (_page_sizes[i] == bytes) {
2937 return true;
2938 }
2939 }
2940 return false;
2941 }
2942
2943 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
2944 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
2945 assert(is_ptr_aligned((void*) start, align),
2946 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
2947 assert(is_size_aligned(bytes, align),
2948 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
2949
2950 // Signal to OS that we want large pages for addresses
2951 // from addr, addr + bytes
2952 struct memcntl_mha mpss_struct;
2953 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
2954 mpss_struct.mha_pagesize = align;
2955 mpss_struct.mha_flags = 0;
2956 // Upon successful completion, memcntl() returns 0
2957 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
2958 debug_only(warning("Attempt to use MPSS failed."));
2959 return false;
2960 }
2961 return true;
2962 }
2963
2964 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
2965 fatal("os::reserve_memory_special should not be called on Solaris.");
2966 return NULL;
2967 }
2968
2969 bool os::release_memory_special(char* base, size_t bytes) {
2970 fatal("os::release_memory_special should not be called on Solaris.");
2971 return false;
2972 }
2973
2974 size_t os::large_page_size() {
2975 return _large_page_size;
2976 }
2977
2978 // MPSS allows application to commit large page memory on demand; with ISM
2979 // the entire memory region must be allocated as shared memory.
2980 bool os::can_commit_large_page_memory() {
2981 return true;
2982 }
2983
2984 bool os::can_execute_large_page_memory() {
2985 return true;
2986 }
2987
2988 // Read calls from inside the vm need to perform state transitions
2989 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2990 size_t res;
2991 JavaThread* thread = (JavaThread*)Thread::current();
2992 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
2993 ThreadBlockInVM tbiv(thread);
2994 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
2995 return res;
2996 }
2997
2998 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2999 size_t res;
3000 JavaThread* thread = (JavaThread*)Thread::current();
3001 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3002 ThreadBlockInVM tbiv(thread);
3003 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
3004 return res;
3005 }
3006
3007 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3008 size_t res;
3009 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3010 "Assumed _thread_in_native");
3011 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3012 return res;
3013 }
3014
3015 void os::naked_short_sleep(jlong ms) {
3016 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3017
3018 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3019 // Solaris requires -lrt for this.
3020 usleep((ms * 1000));
3021
3022 return;
3023 }
3024
3025 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3026 void os::infinite_sleep() {
3027 while (true) { // sleep forever ...
3028 ::sleep(100); // ... 100 seconds at a time
3029 }
3030 }
3031
3032 // Used to convert frequent JVM_Yield() to nops
3033 bool os::dont_yield() {
3034 if (DontYieldALot) {
3035 static hrtime_t last_time = 0;
3036 hrtime_t diff = getTimeNanos() - last_time;
3037
3038 if (diff < DontYieldALotInterval * 1000000) {
3039 return true;
3040 }
3041
3042 last_time += diff;
3043
3044 return false;
3045 } else {
3046 return false;
3047 }
3048 }
3049
3050 // Note that yield semantics are defined by the scheduling class to which
3051 // the thread currently belongs. Typically, yield will _not yield to
3052 // other equal or higher priority threads that reside on the dispatch queues
3053 // of other CPUs.
3054
3055 void os::naked_yield() {
3056 thr_yield();
3057 }
3058
3059 // Interface for setting lwp priorities. We are using T2 libthread,
3060 // which forces the use of bound threads, so all of our threads will
3061 // be assigned to real lwp's. Using the thr_setprio function is
3062 // meaningless in this mode so we must adjust the real lwp's priority.
3063 // The routines below implement the getting and setting of lwp priorities.
3064 //
3065 // Note: There are three priority scales used on Solaris. Java priotities
3066 // which range from 1 to 10, libthread "thr_setprio" scale which range
3067 // from 0 to 127, and the current scheduling class of the process we
3068 // are running in. This is typically from -60 to +60.
3069 // The setting of the lwp priorities in done after a call to thr_setprio
3070 // so Java priorities are mapped to libthread priorities and we map from
3071 // the latter to lwp priorities. We don't keep priorities stored in
3072 // Java priorities since some of our worker threads want to set priorities
3073 // higher than all Java threads.
3074 //
3075 // For related information:
3076 // (1) man -s 2 priocntl
3077 // (2) man -s 4 priocntl
3078 // (3) man dispadmin
3079 // = librt.so
3080 // = libthread/common/rtsched.c - thrp_setlwpprio().
3081 // = ps -cL <pid> ... to validate priority.
3082 // = sched_get_priority_min and _max
3083 // pthread_create
3084 // sched_setparam
3085 // pthread_setschedparam
3086 //
3087 // Assumptions:
3088 // + We assume that all threads in the process belong to the same
3089 // scheduling class. IE. an homogenous process.
3090 // + Must be root or in IA group to change change "interactive" attribute.
3091 // Priocntl() will fail silently. The only indication of failure is when
3092 // we read-back the value and notice that it hasn't changed.
3093 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3094 // + For RT, change timeslice as well. Invariant:
3095 // constant "priority integral"
3096 // Konst == TimeSlice * (60-Priority)
3097 // Given a priority, compute appropriate timeslice.
3098 // + Higher numerical values have higher priority.
3099
3100 // sched class attributes
3101 typedef struct {
3102 int schedPolicy; // classID
3103 int maxPrio;
3104 int minPrio;
3105 } SchedInfo;
3106
3107
3108 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3109
3110 #ifdef ASSERT
3111 static int ReadBackValidate = 1;
3112 #endif
3113 static int myClass = 0;
3114 static int myMin = 0;
3115 static int myMax = 0;
3116 static int myCur = 0;
3117 static bool priocntl_enable = false;
3118
3119 static const int criticalPrio = FXCriticalPriority;
3120 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3121
3122
3123 // lwp_priocntl_init
3124 //
3125 // Try to determine the priority scale for our process.
3126 //
3127 // Return errno or 0 if OK.
3128 //
3129 static int lwp_priocntl_init() {
3130 int rslt;
3131 pcinfo_t ClassInfo;
3132 pcparms_t ParmInfo;
3133 int i;
3134
3135 if (!UseThreadPriorities) return 0;
3136
3137 // If ThreadPriorityPolicy is 1, switch tables
3138 if (ThreadPriorityPolicy == 1) {
3139 for (i = 0; i < CriticalPriority+1; i++)
3140 os::java_to_os_priority[i] = prio_policy1[i];
3141 }
3142 if (UseCriticalJavaThreadPriority) {
3143 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3144 // See set_native_priority() and set_lwp_class_and_priority().
3145 // Save original MaxPriority mapping in case attempt to
3146 // use critical priority fails.
3147 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3148 // Set negative to distinguish from other priorities
3149 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3150 }
3151
3152 // Get IDs for a set of well-known scheduling classes.
3153 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3154 // the system. We should have a loop that iterates over the
3155 // classID values, which are known to be "small" integers.
3156
3157 strcpy(ClassInfo.pc_clname, "TS");
3158 ClassInfo.pc_cid = -1;
3159 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3160 if (rslt < 0) return errno;
3161 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3162 tsLimits.schedPolicy = ClassInfo.pc_cid;
3163 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3164 tsLimits.minPrio = -tsLimits.maxPrio;
3165
3166 strcpy(ClassInfo.pc_clname, "IA");
3167 ClassInfo.pc_cid = -1;
3168 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3169 if (rslt < 0) return errno;
3170 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3171 iaLimits.schedPolicy = ClassInfo.pc_cid;
3172 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3173 iaLimits.minPrio = -iaLimits.maxPrio;
3174
3175 strcpy(ClassInfo.pc_clname, "RT");
3176 ClassInfo.pc_cid = -1;
3177 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3178 if (rslt < 0) return errno;
3179 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3180 rtLimits.schedPolicy = ClassInfo.pc_cid;
3181 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3182 rtLimits.minPrio = 0;
3183
3184 strcpy(ClassInfo.pc_clname, "FX");
3185 ClassInfo.pc_cid = -1;
3186 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3187 if (rslt < 0) return errno;
3188 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3189 fxLimits.schedPolicy = ClassInfo.pc_cid;
3190 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3191 fxLimits.minPrio = 0;
3192
3193 // Query our "current" scheduling class.
3194 // This will normally be IA, TS or, rarely, FX or RT.
3195 memset(&ParmInfo, 0, sizeof(ParmInfo));
3196 ParmInfo.pc_cid = PC_CLNULL;
3197 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3198 if (rslt < 0) return errno;
3199 myClass = ParmInfo.pc_cid;
3200
3201 // We now know our scheduling classId, get specific information
3202 // about the class.
3203 ClassInfo.pc_cid = myClass;
3204 ClassInfo.pc_clname[0] = 0;
3205 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3206 if (rslt < 0) return errno;
3207
3208 if (ThreadPriorityVerbose) {
3209 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3210 }
3211
3212 memset(&ParmInfo, 0, sizeof(pcparms_t));
3213 ParmInfo.pc_cid = PC_CLNULL;
3214 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3215 if (rslt < 0) return errno;
3216
3217 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3218 myMin = rtLimits.minPrio;
3219 myMax = rtLimits.maxPrio;
3220 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3221 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3222 myMin = iaLimits.minPrio;
3223 myMax = iaLimits.maxPrio;
3224 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3225 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3226 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3227 myMin = tsLimits.minPrio;
3228 myMax = tsLimits.maxPrio;
3229 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3230 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3231 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3232 myMin = fxLimits.minPrio;
3233 myMax = fxLimits.maxPrio;
3234 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3235 } else {
3236 // No clue - punt
3237 if (ThreadPriorityVerbose) {
3238 tty->print_cr("Unknown scheduling class: %s ... \n",
3239 ClassInfo.pc_clname);
3240 }
3241 return EINVAL; // no clue, punt
3242 }
3243
3244 if (ThreadPriorityVerbose) {
3245 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3246 }
3247
3248 priocntl_enable = true; // Enable changing priorities
3249 return 0;
3250 }
3251
3252 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3253 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3254 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3255 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3256
3257
3258 // scale_to_lwp_priority
3259 //
3260 // Convert from the libthread "thr_setprio" scale to our current
3261 // lwp scheduling class scale.
3262 //
3263 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3264 int v;
3265
3266 if (x == 127) return rMax; // avoid round-down
3267 v = (((x*(rMax-rMin)))/128)+rMin;
3268 return v;
3269 }
3270
3271
3272 // set_lwp_class_and_priority
3273 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3274 int newPrio, int new_class, bool scale) {
3275 int rslt;
3276 int Actual, Expected, prv;
3277 pcparms_t ParmInfo; // for GET-SET
3278 #ifdef ASSERT
3279 pcparms_t ReadBack; // for readback
3280 #endif
3281
3282 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3283 // Query current values.
3284 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3285 // Cache "pcparms_t" in global ParmCache.
3286 // TODO: elide set-to-same-value
3287
3288 // If something went wrong on init, don't change priorities.
3289 if (!priocntl_enable) {
3290 if (ThreadPriorityVerbose) {
3291 tty->print_cr("Trying to set priority but init failed, ignoring");
3292 }
3293 return EINVAL;
3294 }
3295
3296 // If lwp hasn't started yet, just return
3297 // the _start routine will call us again.
3298 if (lwpid <= 0) {
3299 if (ThreadPriorityVerbose) {
3300 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3301 INTPTR_FORMAT " to %d, lwpid not set",
3302 ThreadID, newPrio);
3303 }
3304 return 0;
3305 }
3306
3307 if (ThreadPriorityVerbose) {
3308 tty->print_cr ("set_lwp_class_and_priority("
3309 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3310 ThreadID, lwpid, newPrio);
3311 }
3312
3313 memset(&ParmInfo, 0, sizeof(pcparms_t));
3314 ParmInfo.pc_cid = PC_CLNULL;
3315 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3316 if (rslt < 0) return errno;
3317
3318 int cur_class = ParmInfo.pc_cid;
3319 ParmInfo.pc_cid = (id_t)new_class;
3320
3321 if (new_class == rtLimits.schedPolicy) {
3322 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3323 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3324 rtLimits.maxPrio, newPrio)
3325 : newPrio;
3326 rtInfo->rt_tqsecs = RT_NOCHANGE;
3327 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3328 if (ThreadPriorityVerbose) {
3329 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3330 }
3331 } else if (new_class == iaLimits.schedPolicy) {
3332 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3333 int maxClamped = MIN2(iaLimits.maxPrio,
3334 cur_class == new_class
3335 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3336 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3337 maxClamped, newPrio)
3338 : newPrio;
3339 iaInfo->ia_uprilim = cur_class == new_class
3340 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3341 iaInfo->ia_mode = IA_NOCHANGE;
3342 if (ThreadPriorityVerbose) {
3343 tty->print_cr("IA: [%d...%d] %d->%d\n",
3344 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3345 }
3346 } else if (new_class == tsLimits.schedPolicy) {
3347 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3348 int maxClamped = MIN2(tsLimits.maxPrio,
3349 cur_class == new_class
3350 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3351 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3352 maxClamped, newPrio)
3353 : newPrio;
3354 tsInfo->ts_uprilim = cur_class == new_class
3355 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3356 if (ThreadPriorityVerbose) {
3357 tty->print_cr("TS: [%d...%d] %d->%d\n",
3358 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3359 }
3360 } else if (new_class == fxLimits.schedPolicy) {
3361 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3362 int maxClamped = MIN2(fxLimits.maxPrio,
3363 cur_class == new_class
3364 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3365 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3366 maxClamped, newPrio)
3367 : newPrio;
3368 fxInfo->fx_uprilim = cur_class == new_class
3369 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3370 fxInfo->fx_tqsecs = FX_NOCHANGE;
3371 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3372 if (ThreadPriorityVerbose) {
3373 tty->print_cr("FX: [%d...%d] %d->%d\n",
3374 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3375 }
3376 } else {
3377 if (ThreadPriorityVerbose) {
3378 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3379 }
3380 return EINVAL; // no clue, punt
3381 }
3382
3383 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3384 if (ThreadPriorityVerbose && rslt) {
3385 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3386 }
3387 if (rslt < 0) return errno;
3388
3389 #ifdef ASSERT
3390 // Sanity check: read back what we just attempted to set.
3391 // In theory it could have changed in the interim ...
3392 //
3393 // The priocntl system call is tricky.
3394 // Sometimes it'll validate the priority value argument and
3395 // return EINVAL if unhappy. At other times it fails silently.
3396 // Readbacks are prudent.
3397
3398 if (!ReadBackValidate) return 0;
3399
3400 memset(&ReadBack, 0, sizeof(pcparms_t));
3401 ReadBack.pc_cid = PC_CLNULL;
3402 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3403 assert(rslt >= 0, "priocntl failed");
3404 Actual = Expected = 0xBAD;
3405 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3406 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3407 Actual = RTPRI(ReadBack)->rt_pri;
3408 Expected = RTPRI(ParmInfo)->rt_pri;
3409 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3410 Actual = IAPRI(ReadBack)->ia_upri;
3411 Expected = IAPRI(ParmInfo)->ia_upri;
3412 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3413 Actual = TSPRI(ReadBack)->ts_upri;
3414 Expected = TSPRI(ParmInfo)->ts_upri;
3415 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3416 Actual = FXPRI(ReadBack)->fx_upri;
3417 Expected = FXPRI(ParmInfo)->fx_upri;
3418 } else {
3419 if (ThreadPriorityVerbose) {
3420 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3421 ParmInfo.pc_cid);
3422 }
3423 }
3424
3425 if (Actual != Expected) {
3426 if (ThreadPriorityVerbose) {
3427 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3428 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3429 }
3430 }
3431 #endif
3432
3433 return 0;
3434 }
3435
3436 // Solaris only gives access to 128 real priorities at a time,
3437 // so we expand Java's ten to fill this range. This would be better
3438 // if we dynamically adjusted relative priorities.
3439 //
3440 // The ThreadPriorityPolicy option allows us to select 2 different
3441 // priority scales.
3442 //
3443 // ThreadPriorityPolicy=0
3444 // Since the Solaris' default priority is MaximumPriority, we do not
3445 // set a priority lower than Max unless a priority lower than
3446 // NormPriority is requested.
3447 //
3448 // ThreadPriorityPolicy=1
3449 // This mode causes the priority table to get filled with
3450 // linear values. NormPriority get's mapped to 50% of the
3451 // Maximum priority an so on. This will cause VM threads
3452 // to get unfair treatment against other Solaris processes
3453 // which do not explicitly alter their thread priorities.
3454
3455 int os::java_to_os_priority[CriticalPriority + 1] = {
3456 -99999, // 0 Entry should never be used
3457
3458 0, // 1 MinPriority
3459 32, // 2
3460 64, // 3
3461
3462 96, // 4
3463 127, // 5 NormPriority
3464 127, // 6
3465
3466 127, // 7
3467 127, // 8
3468 127, // 9 NearMaxPriority
3469
3470 127, // 10 MaxPriority
3471
3472 -criticalPrio // 11 CriticalPriority
3473 };
3474
3475 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3476 OSThread* osthread = thread->osthread();
3477
3478 // Save requested priority in case the thread hasn't been started
3479 osthread->set_native_priority(newpri);
3480
3481 // Check for critical priority request
3482 bool fxcritical = false;
3483 if (newpri == -criticalPrio) {
3484 fxcritical = true;
3485 newpri = criticalPrio;
3486 }
3487
3488 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3489 if (!UseThreadPriorities) return OS_OK;
3490
3491 int status = 0;
3492
3493 if (!fxcritical) {
3494 // Use thr_setprio only if we have a priority that thr_setprio understands
3495 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3496 }
3497
3498 int lwp_status =
3499 set_lwp_class_and_priority(osthread->thread_id(),
3500 osthread->lwp_id(),
3501 newpri,
3502 fxcritical ? fxLimits.schedPolicy : myClass,
3503 !fxcritical);
3504 if (lwp_status != 0 && fxcritical) {
3505 // Try again, this time without changing the scheduling class
3506 newpri = java_MaxPriority_to_os_priority;
3507 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3508 osthread->lwp_id(),
3509 newpri, myClass, false);
3510 }
3511 status |= lwp_status;
3512 return (status == 0) ? OS_OK : OS_ERR;
3513 }
3514
3515
3516 OSReturn os::get_native_priority(const Thread* const thread,
3517 int *priority_ptr) {
3518 int p;
3519 if (!UseThreadPriorities) {
3520 *priority_ptr = NormalPriority;
3521 return OS_OK;
3522 }
3523 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3524 if (status != 0) {
3525 return OS_ERR;
3526 }
3527 *priority_ptr = p;
3528 return OS_OK;
3529 }
3530
3531
3532 // Hint to the underlying OS that a task switch would not be good.
3533 // Void return because it's a hint and can fail.
3534 void os::hint_no_preempt() {
3535 schedctl_start(schedctl_init());
3536 }
3537
3538 static void resume_clear_context(OSThread *osthread) {
3539 osthread->set_ucontext(NULL);
3540 }
3541
3542 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3543 osthread->set_ucontext(context);
3544 }
3545
3546 static PosixSemaphore sr_semaphore;
3547
3548 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3549 // Save and restore errno to avoid confusing native code with EINTR
3550 // after sigsuspend.
3551 int old_errno = errno;
3552
3553 OSThread* osthread = thread->osthread();
3554 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3555
3556 os::SuspendResume::State current = osthread->sr.state();
3557 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3558 suspend_save_context(osthread, uc);
3559
3560 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3561 os::SuspendResume::State state = osthread->sr.suspended();
3562 if (state == os::SuspendResume::SR_SUSPENDED) {
3563 sigset_t suspend_set; // signals for sigsuspend()
3564
3565 // get current set of blocked signals and unblock resume signal
3566 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3567 sigdelset(&suspend_set, os::Solaris::SIGasync());
3568
3569 sr_semaphore.signal();
3570 // wait here until we are resumed
3571 while (1) {
3572 sigsuspend(&suspend_set);
3573
3574 os::SuspendResume::State result = osthread->sr.running();
3575 if (result == os::SuspendResume::SR_RUNNING) {
3576 sr_semaphore.signal();
3577 break;
3578 }
3579 }
3580
3581 } else if (state == os::SuspendResume::SR_RUNNING) {
3582 // request was cancelled, continue
3583 } else {
3584 ShouldNotReachHere();
3585 }
3586
3587 resume_clear_context(osthread);
3588 } else if (current == os::SuspendResume::SR_RUNNING) {
3589 // request was cancelled, continue
3590 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3591 // ignore
3592 } else {
3593 // ignore
3594 }
3595
3596 errno = old_errno;
3597 }
3598
3599 void os::print_statistics() {
3600 }
3601
3602 bool os::message_box(const char* title, const char* message) {
3603 int i;
3604 fdStream err(defaultStream::error_fd());
3605 for (i = 0; i < 78; i++) err.print_raw("=");
3606 err.cr();
3607 err.print_raw_cr(title);
3608 for (i = 0; i < 78; i++) err.print_raw("-");
3609 err.cr();
3610 err.print_raw_cr(message);
3611 for (i = 0; i < 78; i++) err.print_raw("=");
3612 err.cr();
3613
3614 char buf[16];
3615 // Prevent process from exiting upon "read error" without consuming all CPU
3616 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3617
3618 return buf[0] == 'y' || buf[0] == 'Y';
3619 }
3620
3621 static int sr_notify(OSThread* osthread) {
3622 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3623 assert_status(status == 0, status, "thr_kill");
3624 return status;
3625 }
3626
3627 // "Randomly" selected value for how long we want to spin
3628 // before bailing out on suspending a thread, also how often
3629 // we send a signal to a thread we want to resume
3630 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3631 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3632
3633 static bool do_suspend(OSThread* osthread) {
3634 assert(osthread->sr.is_running(), "thread should be running");
3635 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3636
3637 // mark as suspended and send signal
3638 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3639 // failed to switch, state wasn't running?
3640 ShouldNotReachHere();
3641 return false;
3642 }
3643
3644 if (sr_notify(osthread) != 0) {
3645 ShouldNotReachHere();
3646 }
3647
3648 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3649 while (true) {
3650 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3651 break;
3652 } else {
3653 // timeout
3654 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3655 if (cancelled == os::SuspendResume::SR_RUNNING) {
3656 return false;
3657 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3658 // make sure that we consume the signal on the semaphore as well
3659 sr_semaphore.wait();
3660 break;
3661 } else {
3662 ShouldNotReachHere();
3663 return false;
3664 }
3665 }
3666 }
3667
3668 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3669 return true;
3670 }
3671
3672 static void do_resume(OSThread* osthread) {
3673 assert(osthread->sr.is_suspended(), "thread should be suspended");
3674 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3675
3676 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3677 // failed to switch to WAKEUP_REQUEST
3678 ShouldNotReachHere();
3679 return;
3680 }
3681
3682 while (true) {
3683 if (sr_notify(osthread) == 0) {
3684 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3685 if (osthread->sr.is_running()) {
3686 return;
3687 }
3688 }
3689 } else {
3690 ShouldNotReachHere();
3691 }
3692 }
3693
3694 guarantee(osthread->sr.is_running(), "Must be running!");
3695 }
3696
3697 void os::SuspendedThreadTask::internal_do_task() {
3698 if (do_suspend(_thread->osthread())) {
3699 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3700 do_task(context);
3701 do_resume(_thread->osthread());
3702 }
3703 }
3704
3705 class PcFetcher : public os::SuspendedThreadTask {
3706 public:
3707 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3708 ExtendedPC result();
3709 protected:
3710 void do_task(const os::SuspendedThreadTaskContext& context);
3711 private:
3712 ExtendedPC _epc;
3713 };
3714
3715 ExtendedPC PcFetcher::result() {
3716 guarantee(is_done(), "task is not done yet.");
3717 return _epc;
3718 }
3719
3720 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3721 Thread* thread = context.thread();
3722 OSThread* osthread = thread->osthread();
3723 if (osthread->ucontext() != NULL) {
3724 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext());
3725 } else {
3726 // NULL context is unexpected, double-check this is the VMThread
3727 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3728 }
3729 }
3730
3731 // A lightweight implementation that does not suspend the target thread and
3732 // thus returns only a hint. Used for profiling only!
3733 ExtendedPC os::get_thread_pc(Thread* thread) {
3734 // Make sure that it is called by the watcher and the Threads lock is owned.
3735 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3736 // For now, is only used to profile the VM Thread
3737 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3738 PcFetcher fetcher(thread);
3739 fetcher.run();
3740 return fetcher.result();
3741 }
3742
3743
3744 // This does not do anything on Solaris. This is basically a hook for being
3745 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3746 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3747 const methodHandle& method, JavaCallArguments* args,
3748 Thread* thread) {
3749 f(value, method, args, thread);
3750 }
3751
3752 // This routine may be used by user applications as a "hook" to catch signals.
3753 // The user-defined signal handler must pass unrecognized signals to this
3754 // routine, and if it returns true (non-zero), then the signal handler must
3755 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3756 // routine will never retun false (zero), but instead will execute a VM panic
3757 // routine kill the process.
3758 //
3759 // If this routine returns false, it is OK to call it again. This allows
3760 // the user-defined signal handler to perform checks either before or after
3761 // the VM performs its own checks. Naturally, the user code would be making
3762 // a serious error if it tried to handle an exception (such as a null check
3763 // or breakpoint) that the VM was generating for its own correct operation.
3764 //
3765 // This routine may recognize any of the following kinds of signals:
3766 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3767 // os::Solaris::SIGasync
3768 // It should be consulted by handlers for any of those signals.
3769 //
3770 // The caller of this routine must pass in the three arguments supplied
3771 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3772 // field of the structure passed to sigaction(). This routine assumes that
3773 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3774 //
3775 // Note that the VM will print warnings if it detects conflicting signal
3776 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3777 //
3778 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3779 siginfo_t* siginfo,
3780 void* ucontext,
3781 int abort_if_unrecognized);
3782
3783
3784 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3785 int orig_errno = errno; // Preserve errno value over signal handler.
3786 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3787 errno = orig_errno;
3788 }
3789
3790 // This boolean allows users to forward their own non-matching signals
3791 // to JVM_handle_solaris_signal, harmlessly.
3792 bool os::Solaris::signal_handlers_are_installed = false;
3793
3794 // For signal-chaining
3795 bool os::Solaris::libjsig_is_loaded = false;
3796 typedef struct sigaction *(*get_signal_t)(int);
3797 get_signal_t os::Solaris::get_signal_action = NULL;
3798
3799 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3800 struct sigaction *actp = NULL;
3801
3802 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3803 // Retrieve the old signal handler from libjsig
3804 actp = (*get_signal_action)(sig);
3805 }
3806 if (actp == NULL) {
3807 // Retrieve the preinstalled signal handler from jvm
3808 actp = get_preinstalled_handler(sig);
3809 }
3810
3811 return actp;
3812 }
3813
3814 static bool call_chained_handler(struct sigaction *actp, int sig,
3815 siginfo_t *siginfo, void *context) {
3816 // Call the old signal handler
3817 if (actp->sa_handler == SIG_DFL) {
3818 // It's more reasonable to let jvm treat it as an unexpected exception
3819 // instead of taking the default action.
3820 return false;
3821 } else if (actp->sa_handler != SIG_IGN) {
3822 if ((actp->sa_flags & SA_NODEFER) == 0) {
3823 // automaticlly block the signal
3824 sigaddset(&(actp->sa_mask), sig);
3825 }
3826
3827 sa_handler_t hand;
3828 sa_sigaction_t sa;
3829 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3830 // retrieve the chained handler
3831 if (siginfo_flag_set) {
3832 sa = actp->sa_sigaction;
3833 } else {
3834 hand = actp->sa_handler;
3835 }
3836
3837 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3838 actp->sa_handler = SIG_DFL;
3839 }
3840
3841 // try to honor the signal mask
3842 sigset_t oset;
3843 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3844
3845 // call into the chained handler
3846 if (siginfo_flag_set) {
3847 (*sa)(sig, siginfo, context);
3848 } else {
3849 (*hand)(sig);
3850 }
3851
3852 // restore the signal mask
3853 pthread_sigmask(SIG_SETMASK, &oset, 0);
3854 }
3855 // Tell jvm's signal handler the signal is taken care of.
3856 return true;
3857 }
3858
3859 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3860 bool chained = false;
3861 // signal-chaining
3862 if (UseSignalChaining) {
3863 struct sigaction *actp = get_chained_signal_action(sig);
3864 if (actp != NULL) {
3865 chained = call_chained_handler(actp, sig, siginfo, context);
3866 }
3867 }
3868 return chained;
3869 }
3870
3871 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3872 assert((chainedsigactions != (struct sigaction *)NULL) &&
3873 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3874 if (preinstalled_sigs[sig] != 0) {
3875 return &chainedsigactions[sig];
3876 }
3877 return NULL;
3878 }
3879
3880 void os::Solaris::save_preinstalled_handler(int sig,
3881 struct sigaction& oldAct) {
3882 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3883 assert((chainedsigactions != (struct sigaction *)NULL) &&
3884 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3885 chainedsigactions[sig] = oldAct;
3886 preinstalled_sigs[sig] = 1;
3887 }
3888
3889 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3890 bool oktochain) {
3891 // Check for overwrite.
3892 struct sigaction oldAct;
3893 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3894 void* oldhand =
3895 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3896 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3897 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3898 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3899 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3900 if (AllowUserSignalHandlers || !set_installed) {
3901 // Do not overwrite; user takes responsibility to forward to us.
3902 return;
3903 } else if (UseSignalChaining) {
3904 if (oktochain) {
3905 // save the old handler in jvm
3906 save_preinstalled_handler(sig, oldAct);
3907 } else {
3908 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3909 }
3910 // libjsig also interposes the sigaction() call below and saves the
3911 // old sigaction on it own.
3912 } else {
3913 fatal("Encountered unexpected pre-existing sigaction handler "
3914 "%#lx for signal %d.", (long)oldhand, sig);
3915 }
3916 }
3917
3918 struct sigaction sigAct;
3919 sigfillset(&(sigAct.sa_mask));
3920 sigAct.sa_handler = SIG_DFL;
3921
3922 sigAct.sa_sigaction = signalHandler;
3923 // Handle SIGSEGV on alternate signal stack if
3924 // not using stack banging
3925 if (!UseStackBanging && sig == SIGSEGV) {
3926 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3927 } else {
3928 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3929 }
3930 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
3931
3932 sigaction(sig, &sigAct, &oldAct);
3933
3934 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3935 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3936 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3937 }
3938
3939
3940 #define DO_SIGNAL_CHECK(sig) \
3941 do { \
3942 if (!sigismember(&check_signal_done, sig)) { \
3943 os::Solaris::check_signal_handler(sig); \
3944 } \
3945 } while (0)
3946
3947 // This method is a periodic task to check for misbehaving JNI applications
3948 // under CheckJNI, we can add any periodic checks here
3949
3950 void os::run_periodic_checks() {
3951 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
3952 // thereby preventing a NULL checks.
3953 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
3954
3955 if (check_signals == false) return;
3956
3957 // SEGV and BUS if overridden could potentially prevent
3958 // generation of hs*.log in the event of a crash, debugging
3959 // such a case can be very challenging, so we absolutely
3960 // check for the following for a good measure:
3961 DO_SIGNAL_CHECK(SIGSEGV);
3962 DO_SIGNAL_CHECK(SIGILL);
3963 DO_SIGNAL_CHECK(SIGFPE);
3964 DO_SIGNAL_CHECK(SIGBUS);
3965 DO_SIGNAL_CHECK(SIGPIPE);
3966 DO_SIGNAL_CHECK(SIGXFSZ);
3967
3968 // ReduceSignalUsage allows the user to override these handlers
3969 // see comments at the very top and jvm_solaris.h
3970 if (!ReduceSignalUsage) {
3971 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3972 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3973 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3974 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3975 }
3976
3977 // See comments above for using JVM1/JVM2
3978 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
3979
3980 }
3981
3982 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3983
3984 static os_sigaction_t os_sigaction = NULL;
3985
3986 void os::Solaris::check_signal_handler(int sig) {
3987 char buf[O_BUFLEN];
3988 address jvmHandler = NULL;
3989
3990 struct sigaction act;
3991 if (os_sigaction == NULL) {
3992 // only trust the default sigaction, in case it has been interposed
3993 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3994 if (os_sigaction == NULL) return;
3995 }
3996
3997 os_sigaction(sig, (struct sigaction*)NULL, &act);
3998
3999 address thisHandler = (act.sa_flags & SA_SIGINFO)
4000 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4001 : CAST_FROM_FN_PTR(address, act.sa_handler);
4002
4003
4004 switch (sig) {
4005 case SIGSEGV:
4006 case SIGBUS:
4007 case SIGFPE:
4008 case SIGPIPE:
4009 case SIGXFSZ:
4010 case SIGILL:
4011 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4012 break;
4013
4014 case SHUTDOWN1_SIGNAL:
4015 case SHUTDOWN2_SIGNAL:
4016 case SHUTDOWN3_SIGNAL:
4017 case BREAK_SIGNAL:
4018 jvmHandler = (address)user_handler();
4019 break;
4020
4021 default:
4022 int asynsig = os::Solaris::SIGasync();
4023
4024 if (sig == asynsig) {
4025 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4026 } else {
4027 return;
4028 }
4029 break;
4030 }
4031
4032
4033 if (thisHandler != jvmHandler) {
4034 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4035 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4036 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4037 // No need to check this sig any longer
4038 sigaddset(&check_signal_done, sig);
4039 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4040 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4041 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4042 exception_name(sig, buf, O_BUFLEN));
4043 }
4044 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4045 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4046 tty->print("expected:");
4047 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
4048 tty->cr();
4049 tty->print(" found:");
4050 os::Posix::print_sa_flags(tty, act.sa_flags);
4051 tty->cr();
4052 // No need to check this sig any longer
4053 sigaddset(&check_signal_done, sig);
4054 }
4055
4056 // Print all the signal handler state
4057 if (sigismember(&check_signal_done, sig)) {
4058 print_signal_handlers(tty, buf, O_BUFLEN);
4059 }
4060
4061 }
4062
4063 void os::Solaris::install_signal_handlers() {
4064 bool libjsigdone = false;
4065 signal_handlers_are_installed = true;
4066
4067 // signal-chaining
4068 typedef void (*signal_setting_t)();
4069 signal_setting_t begin_signal_setting = NULL;
4070 signal_setting_t end_signal_setting = NULL;
4071 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4072 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4073 if (begin_signal_setting != NULL) {
4074 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4075 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4076 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4077 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4078 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4079 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4080 libjsig_is_loaded = true;
4081 if (os::Solaris::get_libjsig_version != NULL) {
4082 libjsigversion = (*os::Solaris::get_libjsig_version)();
4083 }
4084 assert(UseSignalChaining, "should enable signal-chaining");
4085 }
4086 if (libjsig_is_loaded) {
4087 // Tell libjsig jvm is setting signal handlers
4088 (*begin_signal_setting)();
4089 }
4090
4091 set_signal_handler(SIGSEGV, true, true);
4092 set_signal_handler(SIGPIPE, true, true);
4093 set_signal_handler(SIGXFSZ, true, true);
4094 set_signal_handler(SIGBUS, true, true);
4095 set_signal_handler(SIGILL, true, true);
4096 set_signal_handler(SIGFPE, true, true);
4097
4098
4099 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4100 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4101 // can not register overridable signals which might be > 32
4102 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4103 // Tell libjsig jvm has finished setting signal handlers
4104 (*end_signal_setting)();
4105 libjsigdone = true;
4106 }
4107 }
4108
4109 set_signal_handler(os::Solaris::SIGasync(), true, true);
4110
4111 if (libjsig_is_loaded && !libjsigdone) {
4112 // Tell libjsig jvm finishes setting signal handlers
4113 (*end_signal_setting)();
4114 }
4115
4116 // We don't activate signal checker if libjsig is in place, we trust ourselves
4117 // and if UserSignalHandler is installed all bets are off.
4118 // Log that signal checking is off only if -verbose:jni is specified.
4119 if (CheckJNICalls) {
4120 if (libjsig_is_loaded) {
4121 if (PrintJNIResolving) {
4122 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4123 }
4124 check_signals = false;
4125 }
4126 if (AllowUserSignalHandlers) {
4127 if (PrintJNIResolving) {
4128 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4129 }
4130 check_signals = false;
4131 }
4132 }
4133 }
4134
4135
4136 void report_error(const char* file_name, int line_no, const char* title,
4137 const char* format, ...);
4138
4139 // (Static) wrappers for the liblgrp API
4140 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4141 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4142 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4143 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4144 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4145 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4146 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4147 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4148 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4149
4150 static address resolve_symbol_lazy(const char* name) {
4151 address addr = (address) dlsym(RTLD_DEFAULT, name);
4152 if (addr == NULL) {
4153 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4154 addr = (address) dlsym(RTLD_NEXT, name);
4155 }
4156 return addr;
4157 }
4158
4159 static address resolve_symbol(const char* name) {
4160 address addr = resolve_symbol_lazy(name);
4161 if (addr == NULL) {
4162 fatal(dlerror());
4163 }
4164 return addr;
4165 }
4166
4167 void os::Solaris::libthread_init() {
4168 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4169
4170 lwp_priocntl_init();
4171
4172 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4173 if (func == NULL) {
4174 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4175 // Guarantee that this VM is running on an new enough OS (5.6 or
4176 // later) that it will have a new enough libthread.so.
4177 guarantee(func != NULL, "libthread.so is too old.");
4178 }
4179
4180 int size;
4181 void (*handler_info_func)(address *, int *);
4182 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4183 handler_info_func(&handler_start, &size);
4184 handler_end = handler_start + size;
4185 }
4186
4187
4188 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4189 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4190 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4191 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4192 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4193 int os::Solaris::_mutex_scope = USYNC_THREAD;
4194
4195 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4196 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4197 int_fnP_cond_tP os::Solaris::_cond_signal;
4198 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4199 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4200 int_fnP_cond_tP os::Solaris::_cond_destroy;
4201 int os::Solaris::_cond_scope = USYNC_THREAD;
4202
4203 void os::Solaris::synchronization_init() {
4204 if (UseLWPSynchronization) {
4205 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4206 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4207 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4208 os::Solaris::set_mutex_init(lwp_mutex_init);
4209 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4210 os::Solaris::set_mutex_scope(USYNC_THREAD);
4211
4212 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4213 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4214 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4215 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4216 os::Solaris::set_cond_init(lwp_cond_init);
4217 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4218 os::Solaris::set_cond_scope(USYNC_THREAD);
4219 } else {
4220 os::Solaris::set_mutex_scope(USYNC_THREAD);
4221 os::Solaris::set_cond_scope(USYNC_THREAD);
4222
4223 if (UsePthreads) {
4224 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4225 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4226 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4227 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4228 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4229
4230 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4231 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4232 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4233 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4234 os::Solaris::set_cond_init(pthread_cond_default_init);
4235 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4236 } else {
4237 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4238 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4239 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4240 os::Solaris::set_mutex_init(::mutex_init);
4241 os::Solaris::set_mutex_destroy(::mutex_destroy);
4242
4243 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4244 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4245 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4246 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4247 os::Solaris::set_cond_init(::cond_init);
4248 os::Solaris::set_cond_destroy(::cond_destroy);
4249 }
4250 }
4251 }
4252
4253 bool os::Solaris::liblgrp_init() {
4254 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4255 if (handle != NULL) {
4256 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4257 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4258 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4259 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4260 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4261 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4262 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4263 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4264 dlsym(handle, "lgrp_cookie_stale")));
4265
4266 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4267 set_lgrp_cookie(c);
4268 return true;
4269 }
4270 return false;
4271 }
4272
4273 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4274 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4275 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4276
4277 void init_pset_getloadavg_ptr(void) {
4278 pset_getloadavg_ptr =
4279 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4280 if (pset_getloadavg_ptr == NULL) {
4281 log_warning(os)("pset_getloadavg function not found");
4282 }
4283 }
4284
4285 int os::Solaris::_dev_zero_fd = -1;
4286
4287 // this is called _before_ the global arguments have been parsed
4288 void os::init(void) {
4289 _initial_pid = getpid();
4290
4291 max_hrtime = first_hrtime = gethrtime();
4292
4293 init_random(1234567);
4294
4295 page_size = sysconf(_SC_PAGESIZE);
4296 if (page_size == -1) {
4297 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4298 }
4299 init_page_sizes((size_t) page_size);
4300
4301 Solaris::initialize_system_info();
4302
4303 int fd = ::open("/dev/zero", O_RDWR);
4304 if (fd < 0) {
4305 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4306 } else {
4307 Solaris::set_dev_zero_fd(fd);
4308
4309 // Close on exec, child won't inherit.
4310 fcntl(fd, F_SETFD, FD_CLOEXEC);
4311 }
4312
4313 clock_tics_per_sec = CLK_TCK;
4314
4315 // check if dladdr1() exists; dladdr1 can provide more information than
4316 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4317 // and is available on linker patches for 5.7 and 5.8.
4318 // libdl.so must have been loaded, this call is just an entry lookup
4319 void * hdl = dlopen("libdl.so", RTLD_NOW);
4320 if (hdl) {
4321 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4322 }
4323
4324 // (Solaris only) this switches to calls that actually do locking.
4325 ThreadCritical::initialize();
4326
4327 main_thread = thr_self();
4328
4329 // Constant minimum stack size allowed. It must be at least
4330 // the minimum of what the OS supports (thr_min_stack()), and
4331 // enough to allow the thread to get to user bytecode execution.
4332 Posix::_compiler_thread_min_stack_allowed = MAX2(thr_min_stack(),
4333 Posix::_compiler_thread_min_stack_allowed);
4334 Posix::_java_thread_min_stack_allowed = MAX2(thr_min_stack(),
4335 Posix::_java_thread_min_stack_allowed);
4336 Posix::_vm_internal_thread_min_stack_allowed = MAX2(thr_min_stack(),
4337 Posix::_vm_internal_thread_min_stack_allowed);
4338
4339 // dynamic lookup of functions that may not be available in our lowest
4340 // supported Solaris release
4341 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4342 if (handle != NULL) {
4343 Solaris::_pthread_setname_np = // from 11.3
4344 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4345 }
4346 }
4347
4348 // To install functions for atexit system call
4349 extern "C" {
4350 static void perfMemory_exit_helper() {
4351 perfMemory_exit();
4352 }
4353 }
4354
4355 // this is called _after_ the global arguments have been parsed
4356 jint os::init_2(void) {
4357 // try to enable extended file IO ASAP, see 6431278
4358 os::Solaris::try_enable_extended_io();
4359
4360 // Allocate a single page and mark it as readable for safepoint polling. Also
4361 // use this first mmap call to check support for MAP_ALIGN.
4362 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4363 page_size,
4364 MAP_PRIVATE | MAP_ALIGN,
4365 PROT_READ);
4366 if (polling_page == NULL) {
4367 has_map_align = false;
4368 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4369 PROT_READ);
4370 }
4371
4372 os::set_polling_page(polling_page);
4373 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4374
4375 if (!UseMembar) {
4376 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4377 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4378 os::set_memory_serialize_page(mem_serialize_page);
4379 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4380 }
4381
4382 // Check and sets minimum stack sizes against command line options
4383 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
4384 return JNI_ERR;
4385 }
4386
4387 Solaris::libthread_init();
4388
4389 if (UseNUMA) {
4390 if (!Solaris::liblgrp_init()) {
4391 UseNUMA = false;
4392 } else {
4393 size_t lgrp_limit = os::numa_get_groups_num();
4394 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4395 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4396 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4397 if (lgrp_num < 2) {
4398 // There's only one locality group, disable NUMA.
4399 UseNUMA = false;
4400 }
4401 }
4402 if (!UseNUMA && ForceNUMA) {
4403 UseNUMA = true;
4404 }
4405 }
4406
4407 Solaris::signal_sets_init();
4408 Solaris::init_signal_mem();
4409 Solaris::install_signal_handlers();
4410
4411 if (libjsigversion < JSIG_VERSION_1_4_1) {
4412 Maxlibjsigsigs = OLDMAXSIGNUM;
4413 }
4414
4415 // initialize synchronization primitives to use either thread or
4416 // lwp synchronization (controlled by UseLWPSynchronization)
4417 Solaris::synchronization_init();
4418
4419 if (MaxFDLimit) {
4420 // set the number of file descriptors to max. print out error
4421 // if getrlimit/setrlimit fails but continue regardless.
4422 struct rlimit nbr_files;
4423 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4424 if (status != 0) {
4425 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4426 } else {
4427 nbr_files.rlim_cur = nbr_files.rlim_max;
4428 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4429 if (status != 0) {
4430 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4431 }
4432 }
4433 }
4434
4435 // Calculate theoretical max. size of Threads to guard gainst
4436 // artifical out-of-memory situations, where all available address-
4437 // space has been reserved by thread stacks. Default stack size is 1Mb.
4438 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4439 JavaThread::stack_size_at_create() : (1*K*K);
4440 assert(pre_thread_stack_size != 0, "Must have a stack");
4441 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4442 // we should start doing Virtual Memory banging. Currently when the threads will
4443 // have used all but 200Mb of space.
4444 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4445 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4446
4447 // at-exit methods are called in the reverse order of their registration.
4448 // In Solaris 7 and earlier, atexit functions are called on return from
4449 // main or as a result of a call to exit(3C). There can be only 32 of
4450 // these functions registered and atexit() does not set errno. In Solaris
4451 // 8 and later, there is no limit to the number of functions registered
4452 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4453 // functions are called upon dlclose(3DL) in addition to return from main
4454 // and exit(3C).
4455
4456 if (PerfAllowAtExitRegistration) {
4457 // only register atexit functions if PerfAllowAtExitRegistration is set.
4458 // atexit functions can be delayed until process exit time, which
4459 // can be problematic for embedded VM situations. Embedded VMs should
4460 // call DestroyJavaVM() to assure that VM resources are released.
4461
4462 // note: perfMemory_exit_helper atexit function may be removed in
4463 // the future if the appropriate cleanup code can be added to the
4464 // VM_Exit VMOperation's doit method.
4465 if (atexit(perfMemory_exit_helper) != 0) {
4466 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4467 }
4468 }
4469
4470 // Init pset_loadavg function pointer
4471 init_pset_getloadavg_ptr();
4472
4473 return JNI_OK;
4474 }
4475
4476 // Mark the polling page as unreadable
4477 void os::make_polling_page_unreadable(void) {
4478 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4479 fatal("Could not disable polling page");
4480 }
4481 }
4482
4483 // Mark the polling page as readable
4484 void os::make_polling_page_readable(void) {
4485 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4486 fatal("Could not enable polling page");
4487 }
4488 }
4489
4490 // Is a (classpath) directory empty?
4491 bool os::dir_is_empty(const char* path) {
4492 DIR *dir = NULL;
4493 struct dirent *ptr;
4494
4495 dir = opendir(path);
4496 if (dir == NULL) return true;
4497
4498 // Scan the directory
4499 bool result = true;
4500 char buf[sizeof(struct dirent) + MAX_PATH];
4501 struct dirent *dbuf = (struct dirent *) buf;
4502 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4503 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4504 result = false;
4505 }
4506 }
4507 closedir(dir);
4508 return result;
4509 }
4510
4511 // This code originates from JDK's sysOpen and open64_w
4512 // from src/solaris/hpi/src/system_md.c
4513
4514 int os::open(const char *path, int oflag, int mode) {
4515 if (strlen(path) > MAX_PATH - 1) {
4516 errno = ENAMETOOLONG;
4517 return -1;
4518 }
4519 int fd;
4520
4521 fd = ::open64(path, oflag, mode);
4522 if (fd == -1) return -1;
4523
4524 // If the open succeeded, the file might still be a directory
4525 {
4526 struct stat64 buf64;
4527 int ret = ::fstat64(fd, &buf64);
4528 int st_mode = buf64.st_mode;
4529
4530 if (ret != -1) {
4531 if ((st_mode & S_IFMT) == S_IFDIR) {
4532 errno = EISDIR;
4533 ::close(fd);
4534 return -1;
4535 }
4536 } else {
4537 ::close(fd);
4538 return -1;
4539 }
4540 }
4541
4542 // 32-bit Solaris systems suffer from:
4543 //
4544 // - an historical default soft limit of 256 per-process file
4545 // descriptors that is too low for many Java programs.
4546 //
4547 // - a design flaw where file descriptors created using stdio
4548 // fopen must be less than 256, _even_ when the first limit above
4549 // has been raised. This can cause calls to fopen (but not calls to
4550 // open, for example) to fail mysteriously, perhaps in 3rd party
4551 // native code (although the JDK itself uses fopen). One can hardly
4552 // criticize them for using this most standard of all functions.
4553 //
4554 // We attempt to make everything work anyways by:
4555 //
4556 // - raising the soft limit on per-process file descriptors beyond
4557 // 256
4558 //
4559 // - As of Solaris 10u4, we can request that Solaris raise the 256
4560 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4561 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4562 //
4563 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4564 // workaround the bug by remapping non-stdio file descriptors below
4565 // 256 to ones beyond 256, which is done below.
4566 //
4567 // See:
4568 // 1085341: 32-bit stdio routines should support file descriptors >255
4569 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4570 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4571 // enable_extended_FILE_stdio() in VM initialisation
4572 // Giri Mandalika's blog
4573 // http://technopark02.blogspot.com/2005_05_01_archive.html
4574 //
4575 #ifndef _LP64
4576 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4577 int newfd = ::fcntl(fd, F_DUPFD, 256);
4578 if (newfd != -1) {
4579 ::close(fd);
4580 fd = newfd;
4581 }
4582 }
4583 #endif // 32-bit Solaris
4584
4585 // All file descriptors that are opened in the JVM and not
4586 // specifically destined for a subprocess should have the
4587 // close-on-exec flag set. If we don't set it, then careless 3rd
4588 // party native code might fork and exec without closing all
4589 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4590 // UNIXProcess.c), and this in turn might:
4591 //
4592 // - cause end-of-file to fail to be detected on some file
4593 // descriptors, resulting in mysterious hangs, or
4594 //
4595 // - might cause an fopen in the subprocess to fail on a system
4596 // suffering from bug 1085341.
4597 //
4598 // (Yes, the default setting of the close-on-exec flag is a Unix
4599 // design flaw)
4600 //
4601 // See:
4602 // 1085341: 32-bit stdio routines should support file descriptors >255
4603 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4604 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4605 //
4606 #ifdef FD_CLOEXEC
4607 {
4608 int flags = ::fcntl(fd, F_GETFD);
4609 if (flags != -1) {
4610 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4611 }
4612 }
4613 #endif
4614
4615 return fd;
4616 }
4617
4618 // create binary file, rewriting existing file if required
4619 int os::create_binary_file(const char* path, bool rewrite_existing) {
4620 int oflags = O_WRONLY | O_CREAT;
4621 if (!rewrite_existing) {
4622 oflags |= O_EXCL;
4623 }
4624 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4625 }
4626
4627 // return current position of file pointer
4628 jlong os::current_file_offset(int fd) {
4629 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4630 }
4631
4632 // move file pointer to the specified offset
4633 jlong os::seek_to_file_offset(int fd, jlong offset) {
4634 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4635 }
4636
4637 jlong os::lseek(int fd, jlong offset, int whence) {
4638 return (jlong) ::lseek64(fd, offset, whence);
4639 }
4640
4641 char * os::native_path(char *path) {
4642 return path;
4643 }
4644
4645 int os::ftruncate(int fd, jlong length) {
4646 return ::ftruncate64(fd, length);
4647 }
4648
4649 int os::fsync(int fd) {
4650 RESTARTABLE_RETURN_INT(::fsync(fd));
4651 }
4652
4653 int os::available(int fd, jlong *bytes) {
4654 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4655 "Assumed _thread_in_native");
4656 jlong cur, end;
4657 int mode;
4658 struct stat64 buf64;
4659
4660 if (::fstat64(fd, &buf64) >= 0) {
4661 mode = buf64.st_mode;
4662 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4663 int n,ioctl_return;
4664
4665 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4666 if (ioctl_return>= 0) {
4667 *bytes = n;
4668 return 1;
4669 }
4670 }
4671 }
4672 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4673 return 0;
4674 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4675 return 0;
4676 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4677 return 0;
4678 }
4679 *bytes = end - cur;
4680 return 1;
4681 }
4682
4683 // Map a block of memory.
4684 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4685 char *addr, size_t bytes, bool read_only,
4686 bool allow_exec) {
4687 int prot;
4688 int flags;
4689
4690 if (read_only) {
4691 prot = PROT_READ;
4692 flags = MAP_SHARED;
4693 } else {
4694 prot = PROT_READ | PROT_WRITE;
4695 flags = MAP_PRIVATE;
4696 }
4697
4698 if (allow_exec) {
4699 prot |= PROT_EXEC;
4700 }
4701
4702 if (addr != NULL) {
4703 flags |= MAP_FIXED;
4704 }
4705
4706 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4707 fd, file_offset);
4708 if (mapped_address == MAP_FAILED) {
4709 return NULL;
4710 }
4711 return mapped_address;
4712 }
4713
4714
4715 // Remap a block of memory.
4716 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4717 char *addr, size_t bytes, bool read_only,
4718 bool allow_exec) {
4719 // same as map_memory() on this OS
4720 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4721 allow_exec);
4722 }
4723
4724
4725 // Unmap a block of memory.
4726 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4727 return munmap(addr, bytes) == 0;
4728 }
4729
4730 void os::pause() {
4731 char filename[MAX_PATH];
4732 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4733 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4734 } else {
4735 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4736 }
4737
4738 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4739 if (fd != -1) {
4740 struct stat buf;
4741 ::close(fd);
4742 while (::stat(filename, &buf) == 0) {
4743 (void)::poll(NULL, 0, 100);
4744 }
4745 } else {
4746 jio_fprintf(stderr,
4747 "Could not open pause file '%s', continuing immediately.\n", filename);
4748 }
4749 }
4750
4751 #ifndef PRODUCT
4752 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4753 // Turn this on if you need to trace synch operations.
4754 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4755 // and call record_synch_enable and record_synch_disable
4756 // around the computation of interest.
4757
4758 void record_synch(char* name, bool returning); // defined below
4759
4760 class RecordSynch {
4761 char* _name;
4762 public:
4763 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4764 ~RecordSynch() { record_synch(_name, true); }
4765 };
4766
4767 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4768 extern "C" ret name params { \
4769 typedef ret name##_t params; \
4770 static name##_t* implem = NULL; \
4771 static int callcount = 0; \
4772 if (implem == NULL) { \
4773 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4774 if (implem == NULL) fatal(dlerror()); \
4775 } \
4776 ++callcount; \
4777 RecordSynch _rs(#name); \
4778 inner; \
4779 return implem args; \
4780 }
4781 // in dbx, examine callcounts this way:
4782 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4783
4784 #define CHECK_POINTER_OK(p) \
4785 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4786 #define CHECK_MU \
4787 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4788 #define CHECK_CV \
4789 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4790 #define CHECK_P(p) \
4791 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4792
4793 #define CHECK_MUTEX(mutex_op) \
4794 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4795
4796 CHECK_MUTEX( mutex_lock)
4797 CHECK_MUTEX( _mutex_lock)
4798 CHECK_MUTEX( mutex_unlock)
4799 CHECK_MUTEX(_mutex_unlock)
4800 CHECK_MUTEX( mutex_trylock)
4801 CHECK_MUTEX(_mutex_trylock)
4802
4803 #define CHECK_COND(cond_op) \
4804 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4805
4806 CHECK_COND( cond_wait);
4807 CHECK_COND(_cond_wait);
4808 CHECK_COND(_cond_wait_cancel);
4809
4810 #define CHECK_COND2(cond_op) \
4811 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4812
4813 CHECK_COND2( cond_timedwait);
4814 CHECK_COND2(_cond_timedwait);
4815 CHECK_COND2(_cond_timedwait_cancel);
4816
4817 // do the _lwp_* versions too
4818 #define mutex_t lwp_mutex_t
4819 #define cond_t lwp_cond_t
4820 CHECK_MUTEX( _lwp_mutex_lock)
4821 CHECK_MUTEX( _lwp_mutex_unlock)
4822 CHECK_MUTEX( _lwp_mutex_trylock)
4823 CHECK_MUTEX( __lwp_mutex_lock)
4824 CHECK_MUTEX( __lwp_mutex_unlock)
4825 CHECK_MUTEX( __lwp_mutex_trylock)
4826 CHECK_MUTEX(___lwp_mutex_lock)
4827 CHECK_MUTEX(___lwp_mutex_unlock)
4828
4829 CHECK_COND( _lwp_cond_wait);
4830 CHECK_COND( __lwp_cond_wait);
4831 CHECK_COND(___lwp_cond_wait);
4832
4833 CHECK_COND2( _lwp_cond_timedwait);
4834 CHECK_COND2( __lwp_cond_timedwait);
4835 #undef mutex_t
4836 #undef cond_t
4837
4838 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4839 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4840 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4841 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4842 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4843 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4844 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4845 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4846
4847
4848 // recording machinery:
4849
4850 enum { RECORD_SYNCH_LIMIT = 200 };
4851 char* record_synch_name[RECORD_SYNCH_LIMIT];
4852 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4853 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4854 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4855 int record_synch_count = 0;
4856 bool record_synch_enabled = false;
4857
4858 // in dbx, examine recorded data this way:
4859 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4860
4861 void record_synch(char* name, bool returning) {
4862 if (record_synch_enabled) {
4863 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4864 record_synch_name[record_synch_count] = name;
4865 record_synch_returning[record_synch_count] = returning;
4866 record_synch_thread[record_synch_count] = thr_self();
4867 record_synch_arg0ptr[record_synch_count] = &name;
4868 record_synch_count++;
4869 }
4870 // put more checking code here:
4871 // ...
4872 }
4873 }
4874
4875 void record_synch_enable() {
4876 // start collecting trace data, if not already doing so
4877 if (!record_synch_enabled) record_synch_count = 0;
4878 record_synch_enabled = true;
4879 }
4880
4881 void record_synch_disable() {
4882 // stop collecting trace data
4883 record_synch_enabled = false;
4884 }
4885
4886 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4887 #endif // PRODUCT
4888
4889 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4890 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
4891 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
4892
4893
4894 // JVMTI & JVM monitoring and management support
4895 // The thread_cpu_time() and current_thread_cpu_time() are only
4896 // supported if is_thread_cpu_time_supported() returns true.
4897 // They are not supported on Solaris T1.
4898
4899 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4900 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4901 // of a thread.
4902 //
4903 // current_thread_cpu_time() and thread_cpu_time(Thread *)
4904 // returns the fast estimate available on the platform.
4905
4906 // hrtime_t gethrvtime() return value includes
4907 // user time but does not include system time
4908 jlong os::current_thread_cpu_time() {
4909 return (jlong) gethrvtime();
4910 }
4911
4912 jlong os::thread_cpu_time(Thread *thread) {
4913 // return user level CPU time only to be consistent with
4914 // what current_thread_cpu_time returns.
4915 // thread_cpu_time_info() must be changed if this changes
4916 return os::thread_cpu_time(thread, false /* user time only */);
4917 }
4918
4919 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4920 if (user_sys_cpu_time) {
4921 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4922 } else {
4923 return os::current_thread_cpu_time();
4924 }
4925 }
4926
4927 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4928 char proc_name[64];
4929 int count;
4930 prusage_t prusage;
4931 jlong lwp_time;
4932 int fd;
4933
4934 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
4935 getpid(),
4936 thread->osthread()->lwp_id());
4937 fd = ::open(proc_name, O_RDONLY);
4938 if (fd == -1) return -1;
4939
4940 do {
4941 count = ::pread(fd,
4942 (void *)&prusage.pr_utime,
4943 thr_time_size,
4944 thr_time_off);
4945 } while (count < 0 && errno == EINTR);
4946 ::close(fd);
4947 if (count < 0) return -1;
4948
4949 if (user_sys_cpu_time) {
4950 // user + system CPU time
4951 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
4952 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
4953 (jlong)prusage.pr_stime.tv_nsec +
4954 (jlong)prusage.pr_utime.tv_nsec;
4955 } else {
4956 // user level CPU time only
4957 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
4958 (jlong)prusage.pr_utime.tv_nsec;
4959 }
4960
4961 return (lwp_time);
4962 }
4963
4964 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4965 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4966 info_ptr->may_skip_backward = false; // elapsed time not wall time
4967 info_ptr->may_skip_forward = false; // elapsed time not wall time
4968 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4969 }
4970
4971 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4972 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4973 info_ptr->may_skip_backward = false; // elapsed time not wall time
4974 info_ptr->may_skip_forward = false; // elapsed time not wall time
4975 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
4976 }
4977
4978 bool os::is_thread_cpu_time_supported() {
4979 return true;
4980 }
4981
4982 // System loadavg support. Returns -1 if load average cannot be obtained.
4983 // Return the load average for our processor set if the primitive exists
4984 // (Solaris 9 and later). Otherwise just return system wide loadavg.
4985 int os::loadavg(double loadavg[], int nelem) {
4986 if (pset_getloadavg_ptr != NULL) {
4987 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
4988 } else {
4989 return ::getloadavg(loadavg, nelem);
4990 }
4991 }
4992
4993 //---------------------------------------------------------------------------------
4994
4995 bool os::find(address addr, outputStream* st) {
4996 Dl_info dlinfo;
4997 memset(&dlinfo, 0, sizeof(dlinfo));
4998 if (dladdr(addr, &dlinfo) != 0) {
4999 st->print(PTR_FORMAT ": ", addr);
5000 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5001 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5002 } else if (dlinfo.dli_fbase != NULL) {
5003 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5004 } else {
5005 st->print("<absolute address>");
5006 }
5007 if (dlinfo.dli_fname != NULL) {
5008 st->print(" in %s", dlinfo.dli_fname);
5009 }
5010 if (dlinfo.dli_fbase != NULL) {
5011 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5012 }
5013 st->cr();
5014
5015 if (Verbose) {
5016 // decode some bytes around the PC
5017 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5018 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5019 address lowest = (address) dlinfo.dli_sname;
5020 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5021 if (begin < lowest) begin = lowest;
5022 Dl_info dlinfo2;
5023 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5024 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
5025 end = (address) dlinfo2.dli_saddr;
5026 }
5027 Disassembler::decode(begin, end, st);
5028 }
5029 return true;
5030 }
5031 return false;
5032 }
5033
5034 // Following function has been added to support HotSparc's libjvm.so running
5035 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5036 // src/solaris/hpi/native_threads in the EVM codebase.
5037 //
5038 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5039 // libraries and should thus be removed. We will leave it behind for a while
5040 // until we no longer want to able to run on top of 1.3.0 Solaris production
5041 // JDK. See 4341971.
5042
5043 #define STACK_SLACK 0x800
5044
5045 extern "C" {
5046 intptr_t sysThreadAvailableStackWithSlack() {
5047 stack_t st;
5048 intptr_t retval, stack_top;
5049 retval = thr_stksegment(&st);
5050 assert(retval == 0, "incorrect return value from thr_stksegment");
5051 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5052 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5053 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5054 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5055 }
5056 }
5057
5058 // ObjectMonitor park-unpark infrastructure ...
5059 //
5060 // We implement Solaris and Linux PlatformEvents with the
5061 // obvious condvar-mutex-flag triple.
5062 // Another alternative that works quite well is pipes:
5063 // Each PlatformEvent consists of a pipe-pair.
5064 // The thread associated with the PlatformEvent
5065 // calls park(), which reads from the input end of the pipe.
5066 // Unpark() writes into the other end of the pipe.
5067 // The write-side of the pipe must be set NDELAY.
5068 // Unfortunately pipes consume a large # of handles.
5069 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5070 // Using pipes for the 1st few threads might be workable, however.
5071 //
5072 // park() is permitted to return spuriously.
5073 // Callers of park() should wrap the call to park() in
5074 // an appropriate loop. A litmus test for the correct
5075 // usage of park is the following: if park() were modified
5076 // to immediately return 0 your code should still work,
5077 // albeit degenerating to a spin loop.
5078 //
5079 // In a sense, park()-unpark() just provides more polite spinning
5080 // and polling with the key difference over naive spinning being
5081 // that a parked thread needs to be explicitly unparked() in order
5082 // to wake up and to poll the underlying condition.
5083 //
5084 // Assumption:
5085 // Only one parker can exist on an event, which is why we allocate
5086 // them per-thread. Multiple unparkers can coexist.
5087 //
5088 // _Event transitions in park()
5089 // -1 => -1 : illegal
5090 // 1 => 0 : pass - return immediately
5091 // 0 => -1 : block; then set _Event to 0 before returning
5092 //
5093 // _Event transitions in unpark()
5094 // 0 => 1 : just return
5095 // 1 => 1 : just return
5096 // -1 => either 0 or 1; must signal target thread
5097 // That is, we can safely transition _Event from -1 to either
5098 // 0 or 1.
5099 //
5100 // _Event serves as a restricted-range semaphore.
5101 // -1 : thread is blocked, i.e. there is a waiter
5102 // 0 : neutral: thread is running or ready,
5103 // could have been signaled after a wait started
5104 // 1 : signaled - thread is running or ready
5105 //
5106 // Another possible encoding of _Event would be with
5107 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5108 //
5109 // TODO-FIXME: add DTRACE probes for:
5110 // 1. Tx parks
5111 // 2. Ty unparks Tx
5112 // 3. Tx resumes from park
5113
5114
5115 // value determined through experimentation
5116 #define ROUNDINGFIX 11
5117
5118 // utility to compute the abstime argument to timedwait.
5119 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5120
5121 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5122 // millis is the relative timeout time
5123 // abstime will be the absolute timeout time
5124 if (millis < 0) millis = 0;
5125 struct timeval now;
5126 int status = gettimeofday(&now, NULL);
5127 assert(status == 0, "gettimeofday");
5128 jlong seconds = millis / 1000;
5129 jlong max_wait_period;
5130
5131 if (UseLWPSynchronization) {
5132 // forward port of fix for 4275818 (not sleeping long enough)
5133 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5134 // _lwp_cond_timedwait() used a round_down algorithm rather
5135 // than a round_up. For millis less than our roundfactor
5136 // it rounded down to 0 which doesn't meet the spec.
5137 // For millis > roundfactor we may return a bit sooner, but
5138 // since we can not accurately identify the patch level and
5139 // this has already been fixed in Solaris 9 and 8 we will
5140 // leave it alone rather than always rounding down.
5141
5142 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5143 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5144 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5145 max_wait_period = 21000000;
5146 } else {
5147 max_wait_period = 50000000;
5148 }
5149 millis %= 1000;
5150 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5151 seconds = max_wait_period;
5152 }
5153 abstime->tv_sec = now.tv_sec + seconds;
5154 long usec = now.tv_usec + millis * 1000;
5155 if (usec >= 1000000) {
5156 abstime->tv_sec += 1;
5157 usec -= 1000000;
5158 }
5159 abstime->tv_nsec = usec * 1000;
5160 return abstime;
5161 }
5162
5163 void os::PlatformEvent::park() { // AKA: down()
5164 // Transitions for _Event:
5165 // -1 => -1 : illegal
5166 // 1 => 0 : pass - return immediately
5167 // 0 => -1 : block; then set _Event to 0 before returning
5168
5169 // Invariant: Only the thread associated with the Event/PlatformEvent
5170 // may call park().
5171 assert(_nParked == 0, "invariant");
5172
5173 int v;
5174 for (;;) {
5175 v = _Event;
5176 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5177 }
5178 guarantee(v >= 0, "invariant");
5179 if (v == 0) {
5180 // Do this the hard way by blocking ...
5181 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5182 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5183 // Only for SPARC >= V8PlusA
5184 #if defined(__sparc) && defined(COMPILER2)
5185 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5186 #endif
5187 int status = os::Solaris::mutex_lock(_mutex);
5188 assert_status(status == 0, status, "mutex_lock");
5189 guarantee(_nParked == 0, "invariant");
5190 ++_nParked;
5191 while (_Event < 0) {
5192 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5193 // Treat this the same as if the wait was interrupted
5194 // With usr/lib/lwp going to kernel, always handle ETIME
5195 status = os::Solaris::cond_wait(_cond, _mutex);
5196 if (status == ETIME) status = EINTR;
5197 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5198 }
5199 --_nParked;
5200 _Event = 0;
5201 status = os::Solaris::mutex_unlock(_mutex);
5202 assert_status(status == 0, status, "mutex_unlock");
5203 // Paranoia to ensure our locked and lock-free paths interact
5204 // correctly with each other.
5205 OrderAccess::fence();
5206 }
5207 }
5208
5209 int os::PlatformEvent::park(jlong millis) {
5210 // Transitions for _Event:
5211 // -1 => -1 : illegal
5212 // 1 => 0 : pass - return immediately
5213 // 0 => -1 : block; then set _Event to 0 before returning
5214
5215 guarantee(_nParked == 0, "invariant");
5216 int v;
5217 for (;;) {
5218 v = _Event;
5219 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5220 }
5221 guarantee(v >= 0, "invariant");
5222 if (v != 0) return OS_OK;
5223
5224 int ret = OS_TIMEOUT;
5225 timestruc_t abst;
5226 compute_abstime(&abst, millis);
5227
5228 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5229 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5230 // Only for SPARC >= V8PlusA
5231 #if defined(__sparc) && defined(COMPILER2)
5232 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5233 #endif
5234 int status = os::Solaris::mutex_lock(_mutex);
5235 assert_status(status == 0, status, "mutex_lock");
5236 guarantee(_nParked == 0, "invariant");
5237 ++_nParked;
5238 while (_Event < 0) {
5239 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5240 assert_status(status == 0 || status == EINTR ||
5241 status == ETIME || status == ETIMEDOUT,
5242 status, "cond_timedwait");
5243 if (!FilterSpuriousWakeups) break; // previous semantics
5244 if (status == ETIME || status == ETIMEDOUT) break;
5245 // We consume and ignore EINTR and spurious wakeups.
5246 }
5247 --_nParked;
5248 if (_Event >= 0) ret = OS_OK;
5249 _Event = 0;
5250 status = os::Solaris::mutex_unlock(_mutex);
5251 assert_status(status == 0, status, "mutex_unlock");
5252 // Paranoia to ensure our locked and lock-free paths interact
5253 // correctly with each other.
5254 OrderAccess::fence();
5255 return ret;
5256 }
5257
5258 void os::PlatformEvent::unpark() {
5259 // Transitions for _Event:
5260 // 0 => 1 : just return
5261 // 1 => 1 : just return
5262 // -1 => either 0 or 1; must signal target thread
5263 // That is, we can safely transition _Event from -1 to either
5264 // 0 or 1.
5265 // See also: "Semaphores in Plan 9" by Mullender & Cox
5266 //
5267 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5268 // that it will take two back-to-back park() calls for the owning
5269 // thread to block. This has the benefit of forcing a spurious return
5270 // from the first park() call after an unpark() call which will help
5271 // shake out uses of park() and unpark() without condition variables.
5272
5273 if (Atomic::xchg(1, &_Event) >= 0) return;
5274
5275 // If the thread associated with the event was parked, wake it.
5276 // Wait for the thread assoc with the PlatformEvent to vacate.
5277 int status = os::Solaris::mutex_lock(_mutex);
5278 assert_status(status == 0, status, "mutex_lock");
5279 int AnyWaiters = _nParked;
5280 status = os::Solaris::mutex_unlock(_mutex);
5281 assert_status(status == 0, status, "mutex_unlock");
5282 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5283 if (AnyWaiters != 0) {
5284 // Note that we signal() *after* dropping the lock for "immortal" Events.
5285 // This is safe and avoids a common class of futile wakeups. In rare
5286 // circumstances this can cause a thread to return prematurely from
5287 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5288 // will simply re-test the condition and re-park itself.
5289 // This provides particular benefit if the underlying platform does not
5290 // provide wait morphing.
5291 status = os::Solaris::cond_signal(_cond);
5292 assert_status(status == 0, status, "cond_signal");
5293 }
5294 }
5295
5296 // JSR166
5297 // -------------------------------------------------------
5298
5299 // The solaris and linux implementations of park/unpark are fairly
5300 // conservative for now, but can be improved. They currently use a
5301 // mutex/condvar pair, plus _counter.
5302 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5303 // sets count to 1 and signals condvar. Only one thread ever waits
5304 // on the condvar. Contention seen when trying to park implies that someone
5305 // is unparking you, so don't wait. And spurious returns are fine, so there
5306 // is no need to track notifications.
5307
5308 #define MAX_SECS 100000000
5309
5310 // This code is common to linux and solaris and will be moved to a
5311 // common place in dolphin.
5312 //
5313 // The passed in time value is either a relative time in nanoseconds
5314 // or an absolute time in milliseconds. Either way it has to be unpacked
5315 // into suitable seconds and nanoseconds components and stored in the
5316 // given timespec structure.
5317 // Given time is a 64-bit value and the time_t used in the timespec is only
5318 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5319 // overflow if times way in the future are given. Further on Solaris versions
5320 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5321 // number of seconds, in abstime, is less than current_time + 100,000,000.
5322 // As it will be 28 years before "now + 100000000" will overflow we can
5323 // ignore overflow and just impose a hard-limit on seconds using the value
5324 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5325 // years from "now".
5326 //
5327 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5328 assert(time > 0, "convertTime");
5329
5330 struct timeval now;
5331 int status = gettimeofday(&now, NULL);
5332 assert(status == 0, "gettimeofday");
5333
5334 time_t max_secs = now.tv_sec + MAX_SECS;
5335
5336 if (isAbsolute) {
5337 jlong secs = time / 1000;
5338 if (secs > max_secs) {
5339 absTime->tv_sec = max_secs;
5340 } else {
5341 absTime->tv_sec = secs;
5342 }
5343 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5344 } else {
5345 jlong secs = time / NANOSECS_PER_SEC;
5346 if (secs >= MAX_SECS) {
5347 absTime->tv_sec = max_secs;
5348 absTime->tv_nsec = 0;
5349 } else {
5350 absTime->tv_sec = now.tv_sec + secs;
5351 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5352 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5353 absTime->tv_nsec -= NANOSECS_PER_SEC;
5354 ++absTime->tv_sec; // note: this must be <= max_secs
5355 }
5356 }
5357 }
5358 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5359 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5360 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5361 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5362 }
5363
5364 void Parker::park(bool isAbsolute, jlong time) {
5365 // Ideally we'd do something useful while spinning, such
5366 // as calling unpackTime().
5367
5368 // Optional fast-path check:
5369 // Return immediately if a permit is available.
5370 // We depend on Atomic::xchg() having full barrier semantics
5371 // since we are doing a lock-free update to _counter.
5372 if (Atomic::xchg(0, &_counter) > 0) return;
5373
5374 // Optional fast-exit: Check interrupt before trying to wait
5375 Thread* thread = Thread::current();
5376 assert(thread->is_Java_thread(), "Must be JavaThread");
5377 JavaThread *jt = (JavaThread *)thread;
5378 if (Thread::is_interrupted(thread, false)) {
5379 return;
5380 }
5381
5382 // First, demultiplex/decode time arguments
5383 timespec absTime;
5384 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5385 return;
5386 }
5387 if (time > 0) {
5388 // Warning: this code might be exposed to the old Solaris time
5389 // round-down bugs. Grep "roundingFix" for details.
5390 unpackTime(&absTime, isAbsolute, time);
5391 }
5392
5393 // Enter safepoint region
5394 // Beware of deadlocks such as 6317397.
5395 // The per-thread Parker:: _mutex is a classic leaf-lock.
5396 // In particular a thread must never block on the Threads_lock while
5397 // holding the Parker:: mutex. If safepoints are pending both the
5398 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5399 ThreadBlockInVM tbivm(jt);
5400
5401 // Don't wait if cannot get lock since interference arises from
5402 // unblocking. Also. check interrupt before trying wait
5403 if (Thread::is_interrupted(thread, false) ||
5404 os::Solaris::mutex_trylock(_mutex) != 0) {
5405 return;
5406 }
5407
5408 int status;
5409
5410 if (_counter > 0) { // no wait needed
5411 _counter = 0;
5412 status = os::Solaris::mutex_unlock(_mutex);
5413 assert(status == 0, "invariant");
5414 // Paranoia to ensure our locked and lock-free paths interact
5415 // correctly with each other and Java-level accesses.
5416 OrderAccess::fence();
5417 return;
5418 }
5419
5420 #ifdef ASSERT
5421 // Don't catch signals while blocked; let the running threads have the signals.
5422 // (This allows a debugger to break into the running thread.)
5423 sigset_t oldsigs;
5424 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5425 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5426 #endif
5427
5428 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5429 jt->set_suspend_equivalent();
5430 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5431
5432 // Do this the hard way by blocking ...
5433 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5434 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5435 // Only for SPARC >= V8PlusA
5436 #if defined(__sparc) && defined(COMPILER2)
5437 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5438 #endif
5439
5440 if (time == 0) {
5441 status = os::Solaris::cond_wait(_cond, _mutex);
5442 } else {
5443 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5444 }
5445 // Note that an untimed cond_wait() can sometimes return ETIME on older
5446 // versions of the Solaris.
5447 assert_status(status == 0 || status == EINTR ||
5448 status == ETIME || status == ETIMEDOUT,
5449 status, "cond_timedwait");
5450
5451 #ifdef ASSERT
5452 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
5453 #endif
5454 _counter = 0;
5455 status = os::Solaris::mutex_unlock(_mutex);
5456 assert_status(status == 0, status, "mutex_unlock");
5457 // Paranoia to ensure our locked and lock-free paths interact
5458 // correctly with each other and Java-level accesses.
5459 OrderAccess::fence();
5460
5461 // If externally suspended while waiting, re-suspend
5462 if (jt->handle_special_suspend_equivalent_condition()) {
5463 jt->java_suspend_self();
5464 }
5465 }
5466
5467 void Parker::unpark() {
5468 int status = os::Solaris::mutex_lock(_mutex);
5469 assert(status == 0, "invariant");
5470 const int s = _counter;
5471 _counter = 1;
5472 status = os::Solaris::mutex_unlock(_mutex);
5473 assert(status == 0, "invariant");
5474
5475 if (s < 1) {
5476 status = os::Solaris::cond_signal(_cond);
5477 assert(status == 0, "invariant");
5478 }
5479 }
5480
5481 extern char** environ;
5482
5483 // Run the specified command in a separate process. Return its exit value,
5484 // or -1 on failure (e.g. can't fork a new process).
5485 // Unlike system(), this function can be called from signal handler. It
5486 // doesn't block SIGINT et al.
5487 int os::fork_and_exec(char* cmd) {
5488 char * argv[4];
5489 argv[0] = (char *)"sh";
5490 argv[1] = (char *)"-c";
5491 argv[2] = cmd;
5492 argv[3] = NULL;
5493
5494 // fork is async-safe, fork1 is not so can't use in signal handler
5495 pid_t pid;
5496 Thread* t = Thread::current_or_null_safe();
5497 if (t != NULL && t->is_inside_signal_handler()) {
5498 pid = fork();
5499 } else {
5500 pid = fork1();
5501 }
5502
5503 if (pid < 0) {
5504 // fork failed
5505 warning("fork failed: %s", os::strerror(errno));
5506 return -1;
5507
5508 } else if (pid == 0) {
5509 // child process
5510
5511 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5512 execve("/usr/bin/sh", argv, environ);
5513
5514 // execve failed
5515 _exit(-1);
5516
5517 } else {
5518 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5519 // care about the actual exit code, for now.
5520
5521 int status;
5522
5523 // Wait for the child process to exit. This returns immediately if
5524 // the child has already exited. */
5525 while (waitpid(pid, &status, 0) < 0) {
5526 switch (errno) {
5527 case ECHILD: return 0;
5528 case EINTR: break;
5529 default: return -1;
5530 }
5531 }
5532
5533 if (WIFEXITED(status)) {
5534 // The child exited normally; get its exit code.
5535 return WEXITSTATUS(status);
5536 } else if (WIFSIGNALED(status)) {
5537 // The child exited because of a signal
5538 // The best value to return is 0x80 + signal number,
5539 // because that is what all Unix shells do, and because
5540 // it allows callers to distinguish between process exit and
5541 // process death by signal.
5542 return 0x80 + WTERMSIG(status);
5543 } else {
5544 // Unknown exit code; pass it through
5545 return status;
5546 }
5547 }
5548 }
5549
5550 // is_headless_jre()
5551 //
5552 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5553 // in order to report if we are running in a headless jre
5554 //
5555 // Since JDK8 xawt/libmawt.so was moved into the same directory
5556 // as libawt.so, and renamed libawt_xawt.so
5557 //
5558 bool os::is_headless_jre() {
5559 struct stat statbuf;
5560 char buf[MAXPATHLEN];
5561 char libmawtpath[MAXPATHLEN];
5562 const char *xawtstr = "/xawt/libmawt.so";
5563 const char *new_xawtstr = "/libawt_xawt.so";
5564 char *p;
5565
5566 // Get path to libjvm.so
5567 os::jvm_path(buf, sizeof(buf));
5568
5569 // Get rid of libjvm.so
5570 p = strrchr(buf, '/');
5571 if (p == NULL) {
5572 return false;
5573 } else {
5574 *p = '\0';
5575 }
5576
5577 // Get rid of client or server
5578 p = strrchr(buf, '/');
5579 if (p == NULL) {
5580 return false;
5581 } else {
5582 *p = '\0';
5583 }
5584
5585 // check xawt/libmawt.so
5586 strcpy(libmawtpath, buf);
5587 strcat(libmawtpath, xawtstr);
5588 if (::stat(libmawtpath, &statbuf) == 0) return false;
5589
5590 // check libawt_xawt.so
5591 strcpy(libmawtpath, buf);
5592 strcat(libmawtpath, new_xawtstr);
5593 if (::stat(libmawtpath, &statbuf) == 0) return false;
5594
5595 return true;
5596 }
5597
5598 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5599 size_t res;
5600 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5601 return res;
5602 }
5603
5604 int os::close(int fd) {
5605 return ::close(fd);
5606 }
5607
5608 int os::socket_close(int fd) {
5609 return ::close(fd);
5610 }
5611
5612 int os::recv(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)::recv(fd, buf, nBytes, flags));
5616 }
5617
5618 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5619 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5620 "Assumed _thread_in_native");
5621 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5622 }
5623
5624 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5625 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5626 }
5627
5628 // As both poll and select can be interrupted by signals, we have to be
5629 // prepared to restart the system call after updating the timeout, unless
5630 // a poll() is done with timeout == -1, in which case we repeat with this
5631 // "wait forever" value.
5632
5633 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5634 int _result;
5635 _result = ::connect(fd, him, len);
5636
5637 // On Solaris, when a connect() call is interrupted, the connection
5638 // can be established asynchronously (see 6343810). Subsequent calls
5639 // to connect() must check the errno value which has the semantic
5640 // described below (copied from the connect() man page). Handling
5641 // of asynchronously established connections is required for both
5642 // blocking and non-blocking sockets.
5643 // EINTR The connection attempt was interrupted
5644 // before any data arrived by the delivery of
5645 // a signal. The connection, however, will be
5646 // established asynchronously.
5647 //
5648 // EINPROGRESS The socket is non-blocking, and the connec-
5649 // tion cannot be completed immediately.
5650 //
5651 // EALREADY The socket is non-blocking, and a previous
5652 // connection attempt has not yet been com-
5653 // pleted.
5654 //
5655 // EISCONN The socket is already connected.
5656 if (_result == OS_ERR && errno == EINTR) {
5657 // restarting a connect() changes its errno semantics
5658 RESTARTABLE(::connect(fd, him, len), _result);
5659 // undo these changes
5660 if (_result == OS_ERR) {
5661 if (errno == EALREADY) {
5662 errno = EINPROGRESS; // fall through
5663 } else if (errno == EISCONN) {
5664 errno = 0;
5665 return OS_OK;
5666 }
5667 }
5668 }
5669 return _result;
5670 }
5671
5672 // Get the default path to the core file
5673 // Returns the length of the string
5674 int os::get_core_path(char* buffer, size_t bufferSize) {
5675 const char* p = get_current_directory(buffer, bufferSize);
5676
5677 if (p == NULL) {
5678 assert(p != NULL, "failed to get current directory");
5679 return 0;
5680 }
5681
5682 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5683 p, current_process_id());
5684
5685 return strlen(buffer);
5686 }
5687
5688 #ifndef PRODUCT
5689 void TestReserveMemorySpecial_test() {
5690 // No tests available for this platform
5691 }
5692 #endif
5693
5694 bool os::start_debugging(char *buf, int buflen) {
5695 int len = (int)strlen(buf);
5696 char *p = &buf[len];
5697
5698 jio_snprintf(p, buflen-len,
5699 "\n\n"
5700 "Do you want to debug the problem?\n\n"
5701 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5702 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5703 "Otherwise, press RETURN to abort...",
5704 os::current_process_id(), os::current_thread_id());
5705
5706 bool yes = os::message_box("Unexpected Error", buf);
5707
5708 if (yes) {
5709 // yes, user asked VM to launch debugger
5710 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5711
5712 os::fork_and_exec(buf);
5713 yes = false;
5714 }
5715 return yes;
5716 }