1 /*
2 * Copyright (c) 1997, 2016, 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 "mutex_solaris.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "os_share_solaris.hpp"
41 #include "os_solaris.inline.hpp"
42 #include "prims/jniFastGetField.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/atomic.inline.hpp"
47 #include "runtime/extendedPC.hpp"
48 #include "runtime/globals.hpp"
49 #include "runtime/interfaceSupport.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/mutexLocker.hpp"
53 #include "runtime/objectMonitor.hpp"
54 #include "runtime/orderAccess.inline.hpp"
55 #include "runtime/osThread.hpp"
56 #include "runtime/perfMemory.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/stubRoutines.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "runtime/threadCritical.hpp"
62 #include "runtime/timer.hpp"
63 #include "runtime/vm_version.hpp"
64 #include "semaphore_posix.hpp"
65 #include "services/attachListener.hpp"
66 #include "services/memTracker.hpp"
67 #include "services/runtimeService.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/macros.hpp"
73 #include "utilities/vmError.hpp"
74
75 // put OS-includes here
76 # include <dlfcn.h>
77 # include <errno.h>
78 # include <exception>
79 # include <link.h>
80 # include <poll.h>
81 # include <pthread.h>
82 # include <pwd.h>
83 # include <schedctl.h>
84 # include <setjmp.h>
85 # include <signal.h>
86 # include <stdio.h>
87 # include <alloca.h>
88 # include <sys/filio.h>
89 # include <sys/ipc.h>
90 # include <sys/lwp.h>
91 # include <sys/machelf.h> // for elf Sym structure used by dladdr1
92 # include <sys/mman.h>
93 # include <sys/processor.h>
94 # include <sys/procset.h>
95 # include <sys/pset.h>
96 # include <sys/resource.h>
97 # include <sys/shm.h>
98 # include <sys/socket.h>
99 # include <sys/stat.h>
100 # include <sys/systeminfo.h>
101 # include <sys/time.h>
102 # include <sys/times.h>
103 # include <sys/types.h>
104 # include <sys/wait.h>
105 # include <sys/utsname.h>
106 # include <thread.h>
107 # include <unistd.h>
108 # include <sys/priocntl.h>
109 # include <sys/rtpriocntl.h>
110 # include <sys/tspriocntl.h>
111 # include <sys/iapriocntl.h>
112 # include <sys/fxpriocntl.h>
113 # include <sys/loadavg.h>
114 # include <string.h>
115 # include <stdio.h>
116
117 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
118 # include <sys/procfs.h> // see comment in <sys/procfs.h>
119
120 #define MAX_PATH (2 * K)
121
122 // for timer info max values which include all bits
123 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
124
125
126 // Here are some liblgrp types from sys/lgrp_user.h to be able to
127 // compile on older systems without this header file.
128
129 #ifndef MADV_ACCESS_LWP
130 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */
131 #endif
132 #ifndef MADV_ACCESS_MANY
133 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */
134 #endif
135
136 #ifndef LGRP_RSRC_CPU
137 #define LGRP_RSRC_CPU 0 /* CPU resources */
138 #endif
139 #ifndef LGRP_RSRC_MEM
140 #define LGRP_RSRC_MEM 1 /* memory resources */
141 #endif
142
143 // Values for ThreadPriorityPolicy == 1
144 int prio_policy1[CriticalPriority+1] = {
145 -99999, 0, 16, 32, 48, 64,
146 80, 96, 112, 124, 127, 127 };
147
148 // System parameters used internally
149 static clock_t clock_tics_per_sec = 100;
150
151 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+)
152 static bool enabled_extended_FILE_stdio = false;
153
154 // For diagnostics to print a message once. see run_periodic_checks
155 static bool check_addr0_done = false;
156 static sigset_t check_signal_done;
157 static bool check_signals = true;
158
159 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo
160 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo
161
162 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround
163
164 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL;
165
166 // "default" initializers for missing libc APIs
167 extern "C" {
168 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
169 static int lwp_mutex_destroy(mutex_t *mx) { return 0; }
170
171 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
172 static int lwp_cond_destroy(cond_t *cv) { return 0; }
173 }
174
175 // "default" initializers for pthread-based synchronization
176 extern "C" {
177 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; }
178 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; }
179 }
180
181 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time);
182
183 static inline size_t adjust_stack_size(address base, size_t size) {
184 if ((ssize_t)size < 0) {
185 // 4759953: Compensate for ridiculous stack size.
186 size = max_intx;
187 }
188 if (size > (size_t)base) {
189 // 4812466: Make sure size doesn't allow the stack to wrap the address space.
190 size = (size_t)base;
191 }
192 return size;
193 }
194
195 static inline stack_t get_stack_info() {
196 stack_t st;
197 int retval = thr_stksegment(&st);
198 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size);
199 assert(retval == 0, "incorrect return value from thr_stksegment");
200 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
201 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
202 return st;
203 }
204
205 address os::current_stack_base() {
206 int r = thr_main();
207 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
208 bool is_primordial_thread = r;
209
210 // Workaround 4352906, avoid calls to thr_stksegment by
211 // thr_main after the first one (it looks like we trash
212 // some data, causing the value for ss_sp to be incorrect).
213 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) {
214 stack_t st = get_stack_info();
215 if (is_primordial_thread) {
216 // cache initial value of stack base
217 os::Solaris::_main_stack_base = (address)st.ss_sp;
218 }
219 return (address)st.ss_sp;
220 } else {
221 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base");
222 return os::Solaris::_main_stack_base;
223 }
224 }
225
226 size_t os::current_stack_size() {
227 size_t size;
228
229 int r = thr_main();
230 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
231 if (!r) {
232 size = get_stack_info().ss_size;
233 } else {
234 struct rlimit limits;
235 getrlimit(RLIMIT_STACK, &limits);
236 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur);
237 }
238 // base may not be page aligned
239 address base = current_stack_base();
240 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());;
241 return (size_t)(base - bottom);
242 }
243
244 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
245 return localtime_r(clock, res);
246 }
247
248 void os::Solaris::try_enable_extended_io() {
249 typedef int (*enable_extended_FILE_stdio_t)(int, int);
250
251 if (!UseExtendedFileIO) {
252 return;
253 }
254
255 enable_extended_FILE_stdio_t enabler =
256 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT,
257 "enable_extended_FILE_stdio");
258 if (enabler) {
259 enabler(-1, -1);
260 }
261 }
262
263 static int _processors_online = 0;
264
265 jint os::Solaris::_os_thread_limit = 0;
266 volatile jint os::Solaris::_os_thread_count = 0;
267
268 julong os::available_memory() {
269 return Solaris::available_memory();
270 }
271
272 julong os::Solaris::available_memory() {
273 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size();
274 }
275
276 julong os::Solaris::_physical_memory = 0;
277
278 julong os::physical_memory() {
279 return Solaris::physical_memory();
280 }
281
282 static hrtime_t first_hrtime = 0;
283 static const hrtime_t hrtime_hz = 1000*1000*1000;
284 static volatile hrtime_t max_hrtime = 0;
285
286
287 void os::Solaris::initialize_system_info() {
288 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
289 _processors_online = sysconf(_SC_NPROCESSORS_ONLN);
290 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) *
291 (julong)sysconf(_SC_PAGESIZE);
292 }
293
294 int os::active_processor_count() {
295 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
296 pid_t pid = getpid();
297 psetid_t pset = PS_NONE;
298 // Are we running in a processor set or is there any processor set around?
299 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) {
300 uint_t pset_cpus;
301 // Query the number of cpus available to us.
302 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) {
303 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check");
304 _processors_online = pset_cpus;
305 return pset_cpus;
306 }
307 }
308 // Otherwise return number of online cpus
309 return online_cpus;
310 }
311
312 static bool find_processors_in_pset(psetid_t pset,
313 processorid_t** id_array,
314 uint_t* id_length) {
315 bool result = false;
316 // Find the number of processors in the processor set.
317 if (pset_info(pset, NULL, id_length, NULL) == 0) {
318 // Make up an array to hold their ids.
319 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
320 // Fill in the array with their processor ids.
321 if (pset_info(pset, NULL, id_length, *id_array) == 0) {
322 result = true;
323 }
324 }
325 return result;
326 }
327
328 // Callers of find_processors_online() must tolerate imprecise results --
329 // the system configuration can change asynchronously because of DR
330 // or explicit psradm operations.
331 //
332 // We also need to take care that the loop (below) terminates as the
333 // number of processors online can change between the _SC_NPROCESSORS_ONLN
334 // request and the loop that builds the list of processor ids. Unfortunately
335 // there's no reliable way to determine the maximum valid processor id,
336 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online
337 // man pages, which claim the processor id set is "sparse, but
338 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually
339 // exit the loop.
340 //
341 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's
342 // not available on S8.0.
343
344 static bool find_processors_online(processorid_t** id_array,
345 uint* id_length) {
346 const processorid_t MAX_PROCESSOR_ID = 100000;
347 // Find the number of processors online.
348 *id_length = sysconf(_SC_NPROCESSORS_ONLN);
349 // Make up an array to hold their ids.
350 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal);
351 // Processors need not be numbered consecutively.
352 long found = 0;
353 processorid_t next = 0;
354 while (found < *id_length && next < MAX_PROCESSOR_ID) {
355 processor_info_t info;
356 if (processor_info(next, &info) == 0) {
357 // NB, PI_NOINTR processors are effectively online ...
358 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) {
359 (*id_array)[found] = next;
360 found += 1;
361 }
362 }
363 next += 1;
364 }
365 if (found < *id_length) {
366 // The loop above didn't identify the expected number of processors.
367 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN)
368 // and re-running the loop, above, but there's no guarantee of progress
369 // if the system configuration is in flux. Instead, we just return what
370 // we've got. Note that in the worst case find_processors_online() could
371 // return an empty set. (As a fall-back in the case of the empty set we
372 // could just return the ID of the current processor).
373 *id_length = found;
374 }
375
376 return true;
377 }
378
379 static bool assign_distribution(processorid_t* id_array,
380 uint id_length,
381 uint* distribution,
382 uint distribution_length) {
383 // We assume we can assign processorid_t's to uint's.
384 assert(sizeof(processorid_t) == sizeof(uint),
385 "can't convert processorid_t to uint");
386 // Quick check to see if we won't succeed.
387 if (id_length < distribution_length) {
388 return false;
389 }
390 // Assign processor ids to the distribution.
391 // Try to shuffle processors to distribute work across boards,
392 // assuming 4 processors per board.
393 const uint processors_per_board = ProcessDistributionStride;
394 // Find the maximum processor id.
395 processorid_t max_id = 0;
396 for (uint m = 0; m < id_length; m += 1) {
397 max_id = MAX2(max_id, id_array[m]);
398 }
399 // The next id, to limit loops.
400 const processorid_t limit_id = max_id + 1;
401 // Make up markers for available processors.
402 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal);
403 for (uint c = 0; c < limit_id; c += 1) {
404 available_id[c] = false;
405 }
406 for (uint a = 0; a < id_length; a += 1) {
407 available_id[id_array[a]] = true;
408 }
409 // Step by "boards", then by "slot", copying to "assigned".
410 // NEEDS_CLEANUP: The assignment of processors should be stateful,
411 // remembering which processors have been assigned by
412 // previous calls, etc., so as to distribute several
413 // independent calls of this method. What we'd like is
414 // It would be nice to have an API that let us ask
415 // how many processes are bound to a processor,
416 // but we don't have that, either.
417 // In the short term, "board" is static so that
418 // subsequent distributions don't all start at board 0.
419 static uint board = 0;
420 uint assigned = 0;
421 // Until we've found enough processors ....
422 while (assigned < distribution_length) {
423 // ... find the next available processor in the board.
424 for (uint slot = 0; slot < processors_per_board; slot += 1) {
425 uint try_id = board * processors_per_board + slot;
426 if ((try_id < limit_id) && (available_id[try_id] == true)) {
427 distribution[assigned] = try_id;
428 available_id[try_id] = false;
429 assigned += 1;
430 break;
431 }
432 }
433 board += 1;
434 if (board * processors_per_board + 0 >= limit_id) {
435 board = 0;
436 }
437 }
438 if (available_id != NULL) {
439 FREE_C_HEAP_ARRAY(bool, available_id);
440 }
441 return true;
442 }
443
444 void os::set_native_thread_name(const char *name) {
445 if (Solaris::_pthread_setname_np != NULL) {
446 // Only the first 31 bytes of 'name' are processed by pthread_setname_np
447 // but we explicitly copy into a size-limited buffer to avoid any
448 // possible overflow.
449 char buf[32];
450 snprintf(buf, sizeof(buf), "%s", name);
451 buf[sizeof(buf) - 1] = '\0';
452 Solaris::_pthread_setname_np(pthread_self(), buf);
453 }
454 }
455
456 bool os::distribute_processes(uint length, uint* distribution) {
457 bool result = false;
458 // Find the processor id's of all the available CPUs.
459 processorid_t* id_array = NULL;
460 uint id_length = 0;
461 // There are some races between querying information and using it,
462 // since processor sets can change dynamically.
463 psetid_t pset = PS_NONE;
464 // Are we running in a processor set?
465 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) {
466 result = find_processors_in_pset(pset, &id_array, &id_length);
467 } else {
468 result = find_processors_online(&id_array, &id_length);
469 }
470 if (result == true) {
471 if (id_length >= length) {
472 result = assign_distribution(id_array, id_length, distribution, length);
473 } else {
474 result = false;
475 }
476 }
477 if (id_array != NULL) {
478 FREE_C_HEAP_ARRAY(processorid_t, id_array);
479 }
480 return result;
481 }
482
483 bool os::bind_to_processor(uint processor_id) {
484 // We assume that a processorid_t can be stored in a uint.
485 assert(sizeof(uint) == sizeof(processorid_t),
486 "can't convert uint to processorid_t");
487 int bind_result =
488 processor_bind(P_LWPID, // bind LWP.
489 P_MYID, // bind current LWP.
490 (processorid_t) processor_id, // id.
491 NULL); // don't return old binding.
492 return (bind_result == 0);
493 }
494
495 // Return true if user is running as root.
496
497 bool os::have_special_privileges() {
498 static bool init = false;
499 static bool privileges = false;
500 if (!init) {
501 privileges = (getuid() != geteuid()) || (getgid() != getegid());
502 init = true;
503 }
504 return privileges;
505 }
506
507
508 void os::init_system_properties_values() {
509 // The next steps are taken in the product version:
510 //
511 // Obtain the JAVA_HOME value from the location of libjvm.so.
512 // This library should be located at:
513 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.
514 //
515 // If "/jre/lib/" appears at the right place in the path, then we
516 // assume libjvm.so is installed in a JDK and we use this path.
517 //
518 // Otherwise exit with message: "Could not create the Java virtual machine."
519 //
520 // The following extra steps are taken in the debugging version:
521 //
522 // If "/jre/lib/" does NOT appear at the right place in the path
523 // instead of exit check for $JAVA_HOME environment variable.
524 //
525 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
526 // then we append a fake suffix "hotspot/libjvm.so" to this path so
527 // it looks like libjvm.so is installed there
528 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.
529 //
530 // Otherwise exit.
531 //
532 // Important note: if the location of libjvm.so changes this
533 // code needs to be changed accordingly.
534
535 // Base path of extensions installed on the system.
536 #define SYS_EXT_DIR "/usr/jdk/packages"
537 #define EXTENSIONS_DIR "/lib/ext"
538
539 char cpu_arch[12];
540 // Buffer that fits several sprintfs.
541 // Note that the space for the colon and the trailing null are provided
542 // by the nulls included by the sizeof operator.
543 const size_t bufsize =
544 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
545 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path
546 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir
547 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
548
549 // sysclasspath, java_home, dll_dir
550 {
551 char *pslash;
552 os::jvm_path(buf, bufsize);
553
554 // Found the full path to libjvm.so.
555 // Now cut the path to <java_home>/jre if we can.
556 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
557 pslash = strrchr(buf, '/');
558 if (pslash != NULL) {
559 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
560 }
561 Arguments::set_dll_dir(buf);
562
563 if (pslash != NULL) {
564 pslash = strrchr(buf, '/');
565 if (pslash != NULL) {
566 *pslash = '\0'; // Get rid of /<arch>.
567 pslash = strrchr(buf, '/');
568 if (pslash != NULL) {
569 *pslash = '\0'; // Get rid of /lib.
570 }
571 }
572 }
573 Arguments::set_java_home(buf);
574 set_boot_path('/', ':');
575 }
576
577 // Where to look for native libraries.
578 {
579 // Use dlinfo() to determine the correct java.library.path.
580 //
581 // If we're launched by the Java launcher, and the user
582 // does not set java.library.path explicitly on the commandline,
583 // the Java launcher sets LD_LIBRARY_PATH for us and unsets
584 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case
585 // dlinfo returns LD_LIBRARY_PATH + crle settings (including
586 // /usr/lib), which is exactly what we want.
587 //
588 // If the user does set java.library.path, it completely
589 // overwrites this setting, and always has.
590 //
591 // If we're not launched by the Java launcher, we may
592 // get here with any/all of the LD_LIBRARY_PATH[_32|64]
593 // settings. Again, dlinfo does exactly what we want.
594
595 Dl_serinfo info_sz, *info = &info_sz;
596 Dl_serpath *path;
597 char *library_path;
598 char *common_path = buf;
599
600 // Determine search path count and required buffer size.
601 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) {
602 FREE_C_HEAP_ARRAY(char, buf);
603 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror());
604 }
605
606 // Allocate new buffer and initialize.
607 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal);
608 info->dls_size = info_sz.dls_size;
609 info->dls_cnt = info_sz.dls_cnt;
610
611 // Obtain search path information.
612 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) {
613 FREE_C_HEAP_ARRAY(char, buf);
614 FREE_C_HEAP_ARRAY(char, info);
615 vm_exit_during_initialization("dlinfo SERINFO request", dlerror());
616 }
617
618 path = &info->dls_serpath[0];
619
620 // Note: Due to a legacy implementation, most of the library path
621 // is set in the launcher. This was to accomodate linking restrictions
622 // on legacy Solaris implementations (which are no longer supported).
623 // Eventually, all the library path setting will be done here.
624 //
625 // However, to prevent the proliferation of improperly built native
626 // libraries, the new path component /usr/jdk/packages is added here.
627
628 // Determine the actual CPU architecture.
629 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
630 #ifdef _LP64
631 // If we are a 64-bit vm, perform the following translations:
632 // sparc -> sparcv9
633 // i386 -> amd64
634 if (strcmp(cpu_arch, "sparc") == 0) {
635 strcat(cpu_arch, "v9");
636 } else if (strcmp(cpu_arch, "i386") == 0) {
637 strcpy(cpu_arch, "amd64");
638 }
639 #endif
640
641 // Construct the invariant part of ld_library_path.
642 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch);
643
644 // Struct size is more than sufficient for the path components obtained
645 // through the dlinfo() call, so only add additional space for the path
646 // components explicitly added here.
647 size_t library_path_size = info->dls_size + strlen(common_path);
648 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal);
649 library_path[0] = '\0';
650
651 // Construct the desired Java library path from the linker's library
652 // search path.
653 //
654 // For compatibility, it is optimal that we insert the additional path
655 // components specific to the Java VM after those components specified
656 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so
657 // infrastructure.
658 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it.
659 strcpy(library_path, common_path);
660 } else {
661 int inserted = 0;
662 int i;
663 for (i = 0; i < info->dls_cnt; i++, path++) {
664 uint_t flags = path->dls_flags & LA_SER_MASK;
665 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) {
666 strcat(library_path, common_path);
667 strcat(library_path, os::path_separator());
668 inserted = 1;
669 }
670 strcat(library_path, path->dls_name);
671 strcat(library_path, os::path_separator());
672 }
673 // Eliminate trailing path separator.
674 library_path[strlen(library_path)-1] = '\0';
675 }
676
677 // happens before argument parsing - can't use a trace flag
678 // tty->print_raw("init_system_properties_values: native lib path: ");
679 // tty->print_raw_cr(library_path);
680
681 // Callee copies into its own buffer.
682 Arguments::set_library_path(library_path);
683
684 FREE_C_HEAP_ARRAY(char, library_path);
685 FREE_C_HEAP_ARRAY(char, info);
686 }
687
688 // Extensions directories.
689 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home());
690 Arguments::set_ext_dirs(buf);
691
692 FREE_C_HEAP_ARRAY(char, buf);
693
694 #undef SYS_EXT_DIR
695 #undef EXTENSIONS_DIR
696 }
697
698 void os::breakpoint() {
699 BREAKPOINT;
700 }
701
702 bool os::obsolete_option(const JavaVMOption *option) {
703 if (!strncmp(option->optionString, "-Xt", 3)) {
704 return true;
705 } else if (!strncmp(option->optionString, "-Xtm", 4)) {
706 return true;
707 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) {
708 return true;
709 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) {
710 return true;
711 }
712 return false;
713 }
714
715 bool os::Solaris::valid_stack_address(Thread* thread, address sp) {
716 address stackStart = (address)thread->stack_base();
717 address stackEnd = (address)(stackStart - (address)thread->stack_size());
718 if (sp < stackStart && sp >= stackEnd) return true;
719 return false;
720 }
721
722 extern "C" void breakpoint() {
723 // use debugger to set breakpoint here
724 }
725
726 static thread_t main_thread;
727
728 // Thread start routine for all new Java threads
729 extern "C" void* java_start(void* thread_addr) {
730 // Try to randomize the cache line index of hot stack frames.
731 // This helps when threads of the same stack traces evict each other's
732 // cache lines. The threads can be either from the same JVM instance, or
733 // from different JVM instances. The benefit is especially true for
734 // processors with hyperthreading technology.
735 static int counter = 0;
736 int pid = os::current_process_id();
737 alloca(((pid ^ counter++) & 7) * 128);
738
739 int prio;
740 Thread* thread = (Thread*)thread_addr;
741
742 thread->initialize_thread_current();
743
744 OSThread* osthr = thread->osthread();
745
746 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound
747 thread->_schedctl = (void *) schedctl_init();
748
749 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").",
750 os::current_thread_id());
751
752 if (UseNUMA) {
753 int lgrp_id = os::numa_get_group_id();
754 if (lgrp_id != -1) {
755 thread->set_lgrp_id(lgrp_id);
756 }
757 }
758
759 // If the creator called set priority before we started,
760 // we need to call set_native_priority now that we have an lwp.
761 // We used to get the priority from thr_getprio (we called
762 // thr_setprio way back in create_thread) and pass it to
763 // set_native_priority, but Solaris scales the priority
764 // in java_to_os_priority, so when we read it back here,
765 // we pass trash to set_native_priority instead of what's
766 // in java_to_os_priority. So we save the native priority
767 // in the osThread and recall it here.
768
769 if (osthr->thread_id() != -1) {
770 if (UseThreadPriorities) {
771 int prio = osthr->native_priority();
772 if (ThreadPriorityVerbose) {
773 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is "
774 INTPTR_FORMAT ", setting priority: %d\n",
775 osthr->thread_id(), osthr->lwp_id(), prio);
776 }
777 os::set_native_priority(thread, prio);
778 }
779 } else if (ThreadPriorityVerbose) {
780 warning("Can't set priority in _start routine, thread id hasn't been set\n");
781 }
782
783 assert(osthr->get_state() == RUNNABLE, "invalid os thread state");
784
785 // initialize signal mask for this thread
786 os::Solaris::hotspot_sigmask(thread);
787
788 thread->run();
789
790 // One less thread is executing
791 // When the VMThread gets here, the main thread may have already exited
792 // which frees the CodeHeap containing the Atomic::dec code
793 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) {
794 Atomic::dec(&os::Solaris::_os_thread_count);
795 }
796
797 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id());
798
799 if (UseDetachedThreads) {
800 thr_exit(NULL);
801 ShouldNotReachHere();
802 }
803 return NULL;
804 }
805
806 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) {
807 // Allocate the OSThread object
808 OSThread* osthread = new OSThread(NULL, NULL);
809 if (osthread == NULL) return NULL;
810
811 // Store info on the Solaris thread into the OSThread
812 osthread->set_thread_id(thread_id);
813 osthread->set_lwp_id(_lwp_self());
814 thread->_schedctl = (void *) schedctl_init();
815
816 if (UseNUMA) {
817 int lgrp_id = os::numa_get_group_id();
818 if (lgrp_id != -1) {
819 thread->set_lgrp_id(lgrp_id);
820 }
821 }
822
823 if (ThreadPriorityVerbose) {
824 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n",
825 osthread->thread_id(), osthread->lwp_id());
826 }
827
828 // Initial thread state is INITIALIZED, not SUSPENDED
829 osthread->set_state(INITIALIZED);
830
831 return osthread;
832 }
833
834 void os::Solaris::hotspot_sigmask(Thread* thread) {
835 //Save caller's signal mask
836 sigset_t sigmask;
837 pthread_sigmask(SIG_SETMASK, NULL, &sigmask);
838 OSThread *osthread = thread->osthread();
839 osthread->set_caller_sigmask(sigmask);
840
841 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL);
842 if (!ReduceSignalUsage) {
843 if (thread->is_VM_thread()) {
844 // Only the VM thread handles BREAK_SIGNAL ...
845 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
846 } else {
847 // ... all other threads block BREAK_SIGNAL
848 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked");
849 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
850 }
851 }
852 }
853
854 bool os::create_attached_thread(JavaThread* thread) {
855 #ifdef ASSERT
856 thread->verify_not_published();
857 #endif
858 OSThread* osthread = create_os_thread(thread, thr_self());
859 if (osthread == NULL) {
860 return false;
861 }
862
863 // Initial thread state is RUNNABLE
864 osthread->set_state(RUNNABLE);
865 thread->set_osthread(osthread);
866
867 // initialize signal mask for this thread
868 // and save the caller's signal mask
869 os::Solaris::hotspot_sigmask(thread);
870
871 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").",
872 os::current_thread_id());
873
874 return true;
875 }
876
877 bool os::create_main_thread(JavaThread* thread) {
878 #ifdef ASSERT
879 thread->verify_not_published();
880 #endif
881 if (_starting_thread == NULL) {
882 _starting_thread = create_os_thread(thread, main_thread);
883 if (_starting_thread == NULL) {
884 return false;
885 }
886 }
887
888 // The primodial thread is runnable from the start
889 _starting_thread->set_state(RUNNABLE);
890
891 thread->set_osthread(_starting_thread);
892
893 // initialize signal mask for this thread
894 // and save the caller's signal mask
895 os::Solaris::hotspot_sigmask(thread);
896
897 return true;
898 }
899
900 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr()
901 static char* describe_thr_create_attributes(char* buf, size_t buflen,
902 size_t stacksize, long flags) {
903 stringStream ss(buf, buflen);
904 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024);
905 ss.print("flags: ");
906 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " ");
907 #define ALL(X) \
908 X(THR_SUSPENDED) \
909 X(THR_DETACHED) \
910 X(THR_BOUND) \
911 X(THR_NEW_LWP) \
912 X(THR_DAEMON)
913 ALL(PRINT_FLAG)
914 #undef ALL
915 #undef PRINT_FLAG
916 return buf;
917 }
918
919 bool os::create_thread(Thread* thread, ThreadType thr_type,
920 size_t stack_size) {
921 // Allocate the OSThread object
922 OSThread* osthread = new OSThread(NULL, NULL);
923 if (osthread == NULL) {
924 return false;
925 }
926
927 if (ThreadPriorityVerbose) {
928 char *thrtyp;
929 switch (thr_type) {
930 case vm_thread:
931 thrtyp = (char *)"vm";
932 break;
933 case cgc_thread:
934 thrtyp = (char *)"cgc";
935 break;
936 case pgc_thread:
937 thrtyp = (char *)"pgc";
938 break;
939 case java_thread:
940 thrtyp = (char *)"java";
941 break;
942 case compiler_thread:
943 thrtyp = (char *)"compiler";
944 break;
945 case watcher_thread:
946 thrtyp = (char *)"watcher";
947 break;
948 default:
949 thrtyp = (char *)"unknown";
950 break;
951 }
952 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp);
953 }
954
955 // Calculate stack size if it's not specified by caller.
956 if (stack_size == 0) {
957 // The default stack size 1M (2M for LP64).
958 stack_size = (BytesPerWord >> 2) * K * K;
959
960 switch (thr_type) {
961 case os::java_thread:
962 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss
963 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create();
964 break;
965 case os::compiler_thread:
966 if (CompilerThreadStackSize > 0) {
967 stack_size = (size_t)(CompilerThreadStackSize * K);
968 break;
969 } // else fall through:
970 // use VMThreadStackSize if CompilerThreadStackSize is not defined
971 case os::vm_thread:
972 case os::pgc_thread:
973 case os::cgc_thread:
974 case os::watcher_thread:
975 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
976 break;
977 }
978 }
979 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed);
980
981 // Initial state is ALLOCATED but not INITIALIZED
982 osthread->set_state(ALLOCATED);
983
984 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) {
985 // We got lots of threads. Check if we still have some address space left.
986 // Need to be at least 5Mb of unreserved address space. We do check by
987 // trying to reserve some.
988 const size_t VirtualMemoryBangSize = 20*K*K;
989 char* mem = os::reserve_memory(VirtualMemoryBangSize);
990 if (mem == NULL) {
991 delete osthread;
992 return false;
993 } else {
994 // Release the memory again
995 os::release_memory(mem, VirtualMemoryBangSize);
996 }
997 }
998
999 // Setup osthread because the child thread may need it.
1000 thread->set_osthread(osthread);
1001
1002 // Create the Solaris thread
1003 thread_t tid = 0;
1004 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED;
1005 int status;
1006
1007 // Mark that we don't have an lwp or thread id yet.
1008 // In case we attempt to set the priority before the thread starts.
1009 osthread->set_lwp_id(-1);
1010 osthread->set_thread_id(-1);
1011
1012 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid);
1013
1014 char buf[64];
1015 if (status == 0) {
1016 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ",
1017 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1018 } else {
1019 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.",
1020 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags));
1021 }
1022
1023 if (status != 0) {
1024 thread->set_osthread(NULL);
1025 // Need to clean up stuff we've allocated so far
1026 delete osthread;
1027 return false;
1028 }
1029
1030 Atomic::inc(&os::Solaris::_os_thread_count);
1031
1032 // Store info on the Solaris thread into the OSThread
1033 osthread->set_thread_id(tid);
1034
1035 // Remember that we created this thread so we can set priority on it
1036 osthread->set_vm_created();
1037
1038 // Initial thread state is INITIALIZED, not SUSPENDED
1039 osthread->set_state(INITIALIZED);
1040
1041 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain
1042 return true;
1043 }
1044
1045 // defined for >= Solaris 10. This allows builds on earlier versions
1046 // of Solaris to take advantage of the newly reserved Solaris JVM signals.
1047 // With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL
1048 // was SIGJVM1.
1049 //
1050 #if !defined(SIGJVM1)
1051 #define SIGJVM1 39
1052 #define SIGJVM2 40
1053 #endif
1054
1055 debug_only(static bool signal_sets_initialized = false);
1056 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
1057
1058 int os::Solaris::_SIGasync = ASYNC_SIGNAL;
1059
1060 bool os::Solaris::is_sig_ignored(int sig) {
1061 struct sigaction oact;
1062 sigaction(sig, (struct sigaction*)NULL, &oact);
1063 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
1064 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
1065 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
1066 return true;
1067 } else {
1068 return false;
1069 }
1070 }
1071
1072 // Note: SIGRTMIN is a macro that calls sysconf() so it will
1073 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime
1074 static bool isJVM1available() {
1075 return SIGJVM1 < SIGRTMIN;
1076 }
1077
1078 void os::Solaris::signal_sets_init() {
1079 // Should also have an assertion stating we are still single-threaded.
1080 assert(!signal_sets_initialized, "Already initialized");
1081 // Fill in signals that are necessarily unblocked for all threads in
1082 // the VM. Currently, we unblock the following signals:
1083 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
1084 // by -Xrs (=ReduceSignalUsage));
1085 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
1086 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
1087 // the dispositions or masks wrt these signals.
1088 // Programs embedding the VM that want to use the above signals for their
1089 // own purposes must, at this time, use the "-Xrs" option to prevent
1090 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
1091 // (See bug 4345157, and other related bugs).
1092 // In reality, though, unblocking these signals is really a nop, since
1093 // these signals are not blocked by default.
1094 sigemptyset(&unblocked_sigs);
1095 sigemptyset(&allowdebug_blocked_sigs);
1096 sigaddset(&unblocked_sigs, SIGILL);
1097 sigaddset(&unblocked_sigs, SIGSEGV);
1098 sigaddset(&unblocked_sigs, SIGBUS);
1099 sigaddset(&unblocked_sigs, SIGFPE);
1100
1101 // Always true on Solaris 10+
1102 guarantee(isJVM1available(), "SIGJVM1/2 missing!");
1103 os::Solaris::set_SIGasync(SIGJVM2);
1104
1105 sigaddset(&unblocked_sigs, os::Solaris::SIGasync());
1106
1107 if (!ReduceSignalUsage) {
1108 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
1109 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
1110 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
1111 }
1112 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
1113 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
1114 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
1115 }
1116 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
1117 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
1118 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
1119 }
1120 }
1121 // Fill in signals that are blocked by all but the VM thread.
1122 sigemptyset(&vm_sigs);
1123 if (!ReduceSignalUsage) {
1124 sigaddset(&vm_sigs, BREAK_SIGNAL);
1125 }
1126 debug_only(signal_sets_initialized = true);
1127
1128 // For diagnostics only used in run_periodic_checks
1129 sigemptyset(&check_signal_done);
1130 }
1131
1132 // These are signals that are unblocked while a thread is running Java.
1133 // (For some reason, they get blocked by default.)
1134 sigset_t* os::Solaris::unblocked_signals() {
1135 assert(signal_sets_initialized, "Not initialized");
1136 return &unblocked_sigs;
1137 }
1138
1139 // These are the signals that are blocked while a (non-VM) thread is
1140 // running Java. Only the VM thread handles these signals.
1141 sigset_t* os::Solaris::vm_signals() {
1142 assert(signal_sets_initialized, "Not initialized");
1143 return &vm_sigs;
1144 }
1145
1146 // These are signals that are blocked during cond_wait to allow debugger in
1147 sigset_t* os::Solaris::allowdebug_blocked_signals() {
1148 assert(signal_sets_initialized, "Not initialized");
1149 return &allowdebug_blocked_sigs;
1150 }
1151
1152
1153 void _handle_uncaught_cxx_exception() {
1154 VMError::report_and_die("An uncaught C++ exception");
1155 }
1156
1157
1158 // First crack at OS-specific initialization, from inside the new thread.
1159 void os::initialize_thread(Thread* thr) {
1160 int r = thr_main();
1161 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689");
1162 if (r) {
1163 JavaThread* jt = (JavaThread *)thr;
1164 assert(jt != NULL, "Sanity check");
1165 size_t stack_size;
1166 address base = jt->stack_base();
1167 if (Arguments::created_by_java_launcher()) {
1168 // Use 2MB to allow for Solaris 7 64 bit mode.
1169 stack_size = JavaThread::stack_size_at_create() == 0
1170 ? 2048*K : JavaThread::stack_size_at_create();
1171
1172 // There are rare cases when we may have already used more than
1173 // the basic stack size allotment before this method is invoked.
1174 // Attempt to allow for a normally sized java_stack.
1175 size_t current_stack_offset = (size_t)(base - (address)&stack_size);
1176 stack_size += ReservedSpace::page_align_size_down(current_stack_offset);
1177 } else {
1178 // 6269555: If we were not created by a Java launcher, i.e. if we are
1179 // running embedded in a native application, treat the primordial thread
1180 // as much like a native attached thread as possible. This means using
1181 // the current stack size from thr_stksegment(), unless it is too large
1182 // to reliably setup guard pages. A reasonable max size is 8MB.
1183 size_t current_size = current_stack_size();
1184 // This should never happen, but just in case....
1185 if (current_size == 0) current_size = 2 * K * K;
1186 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size;
1187 }
1188 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());;
1189 stack_size = (size_t)(base - bottom);
1190
1191 assert(stack_size > 0, "Stack size calculation problem");
1192
1193 if (stack_size > jt->stack_size()) {
1194 #ifndef PRODUCT
1195 struct rlimit limits;
1196 getrlimit(RLIMIT_STACK, &limits);
1197 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur);
1198 assert(size >= jt->stack_size(), "Stack size problem in main thread");
1199 #endif
1200 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n"
1201 "(Stack sizes are rounded up to a multiple of the system page size.)\n"
1202 "See limit(1) to increase the stack size limit.",
1203 stack_size / K, jt->stack_size() / K);
1204 vm_exit(1);
1205 }
1206 assert(jt->stack_size() >= stack_size,
1207 "Attempt to map more stack than was allocated");
1208 jt->set_stack_size(stack_size);
1209 }
1210
1211 // With the T2 libthread (T1 is no longer supported) threads are always bound
1212 // and we use stackbanging in all cases.
1213
1214 os::Solaris::init_thread_fpu_state();
1215 std::set_terminate(_handle_uncaught_cxx_exception);
1216 }
1217
1218
1219
1220 // Free Solaris resources related to the OSThread
1221 void os::free_thread(OSThread* osthread) {
1222 assert(osthread != NULL, "os::free_thread but osthread not set");
1223
1224
1225 // We are told to free resources of the argument thread,
1226 // but we can only really operate on the current thread.
1227 // The main thread must take the VMThread down synchronously
1228 // before the main thread exits and frees up CodeHeap
1229 guarantee((Thread::current()->osthread() == osthread
1230 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread");
1231 if (Thread::current()->osthread() == osthread) {
1232 // Restore caller's signal mask
1233 sigset_t sigmask = osthread->caller_sigmask();
1234 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1235 }
1236 delete osthread;
1237 }
1238
1239 void os::pd_start_thread(Thread* thread) {
1240 int status = thr_continue(thread->osthread()->thread_id());
1241 assert_status(status == 0, status, "thr_continue failed");
1242 }
1243
1244
1245 intx os::current_thread_id() {
1246 return (intx)thr_self();
1247 }
1248
1249 static pid_t _initial_pid = 0;
1250
1251 int os::current_process_id() {
1252 return (int)(_initial_pid ? _initial_pid : getpid());
1253 }
1254
1255 // gethrtime() should be monotonic according to the documentation,
1256 // but some virtualized platforms are known to break this guarantee.
1257 // getTimeNanos() must be guaranteed not to move backwards, so we
1258 // are forced to add a check here.
1259 inline hrtime_t getTimeNanos() {
1260 const hrtime_t now = gethrtime();
1261 const hrtime_t prev = max_hrtime;
1262 if (now <= prev) {
1263 return prev; // same or retrograde time;
1264 }
1265 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev);
1266 assert(obsv >= prev, "invariant"); // Monotonicity
1267 // If the CAS succeeded then we're done and return "now".
1268 // If the CAS failed and the observed value "obsv" is >= now then
1269 // we should return "obsv". If the CAS failed and now > obsv > prv then
1270 // some other thread raced this thread and installed a new value, in which case
1271 // we could either (a) retry the entire operation, (b) retry trying to install now
1272 // or (c) just return obsv. We use (c). No loop is required although in some cases
1273 // we might discard a higher "now" value in deference to a slightly lower but freshly
1274 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1275 // to (a) or (b) -- and greatly reduces coherence traffic.
1276 // We might also condition (c) on the magnitude of the delta between obsv and now.
1277 // Avoiding excessive CAS operations to hot RW locations is critical.
1278 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1279 return (prev == obsv) ? now : obsv;
1280 }
1281
1282 // Time since start-up in seconds to a fine granularity.
1283 // Used by VMSelfDestructTimer and the MemProfiler.
1284 double os::elapsedTime() {
1285 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz;
1286 }
1287
1288 jlong os::elapsed_counter() {
1289 return (jlong)(getTimeNanos() - first_hrtime);
1290 }
1291
1292 jlong os::elapsed_frequency() {
1293 return hrtime_hz;
1294 }
1295
1296 // Return the real, user, and system times in seconds from an
1297 // arbitrary fixed point in the past.
1298 bool os::getTimesSecs(double* process_real_time,
1299 double* process_user_time,
1300 double* process_system_time) {
1301 struct tms ticks;
1302 clock_t real_ticks = times(&ticks);
1303
1304 if (real_ticks == (clock_t) (-1)) {
1305 return false;
1306 } else {
1307 double ticks_per_second = (double) clock_tics_per_sec;
1308 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1309 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1310 // For consistency return the real time from getTimeNanos()
1311 // converted to seconds.
1312 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS);
1313
1314 return true;
1315 }
1316 }
1317
1318 bool os::supports_vtime() { return true; }
1319
1320 bool os::enable_vtime() {
1321 int fd = ::open("/proc/self/ctl", O_WRONLY);
1322 if (fd == -1) {
1323 return false;
1324 }
1325
1326 long cmd[] = { PCSET, PR_MSACCT };
1327 int res = ::write(fd, cmd, sizeof(long) * 2);
1328 ::close(fd);
1329 if (res != sizeof(long) * 2) {
1330 return false;
1331 }
1332 return true;
1333 }
1334
1335 bool os::vtime_enabled() {
1336 int fd = ::open("/proc/self/status", O_RDONLY);
1337 if (fd == -1) {
1338 return false;
1339 }
1340
1341 pstatus_t status;
1342 int res = os::read(fd, (void*) &status, sizeof(pstatus_t));
1343 ::close(fd);
1344 if (res != sizeof(pstatus_t)) {
1345 return false;
1346 }
1347 return status.pr_flags & PR_MSACCT;
1348 }
1349
1350 double os::elapsedVTime() {
1351 return (double)gethrvtime() / (double)hrtime_hz;
1352 }
1353
1354 // Used internally for comparisons only
1355 // getTimeMillis guaranteed to not move backwards on Solaris
1356 jlong getTimeMillis() {
1357 jlong nanotime = getTimeNanos();
1358 return (jlong)(nanotime / NANOSECS_PER_MILLISEC);
1359 }
1360
1361 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis
1362 jlong os::javaTimeMillis() {
1363 timeval t;
1364 if (gettimeofday(&t, NULL) == -1) {
1365 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno));
1366 }
1367 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000;
1368 }
1369
1370 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1371 timeval t;
1372 if (gettimeofday(&t, NULL) == -1) {
1373 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno));
1374 }
1375 seconds = jlong(t.tv_sec);
1376 nanos = jlong(t.tv_usec) * 1000;
1377 }
1378
1379
1380 jlong os::javaTimeNanos() {
1381 return (jlong)getTimeNanos();
1382 }
1383
1384 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1385 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits
1386 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
1387 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
1388 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1389 }
1390
1391 char * os::local_time_string(char *buf, size_t buflen) {
1392 struct tm t;
1393 time_t long_time;
1394 time(&long_time);
1395 localtime_r(&long_time, &t);
1396 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1397 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1398 t.tm_hour, t.tm_min, t.tm_sec);
1399 return buf;
1400 }
1401
1402 // Note: os::shutdown() might be called very early during initialization, or
1403 // called from signal handler. Before adding something to os::shutdown(), make
1404 // sure it is async-safe and can handle partially initialized VM.
1405 void os::shutdown() {
1406
1407 // allow PerfMemory to attempt cleanup of any persistent resources
1408 perfMemory_exit();
1409
1410 // needs to remove object in file system
1411 AttachListener::abort();
1412
1413 // flush buffered output, finish log files
1414 ostream_abort();
1415
1416 // Check for abort hook
1417 abort_hook_t abort_hook = Arguments::abort_hook();
1418 if (abort_hook != NULL) {
1419 abort_hook();
1420 }
1421 }
1422
1423 // Note: os::abort() might be called very early during initialization, or
1424 // called from signal handler. Before adding something to os::abort(), make
1425 // sure it is async-safe and can handle partially initialized VM.
1426 void os::abort(bool dump_core, void* siginfo, const void* context) {
1427 os::shutdown();
1428 if (dump_core) {
1429 #ifndef PRODUCT
1430 fdStream out(defaultStream::output_fd());
1431 out.print_raw("Current thread is ");
1432 char buf[16];
1433 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1434 out.print_raw_cr(buf);
1435 out.print_raw_cr("Dumping core ...");
1436 #endif
1437 ::abort(); // dump core (for debugging)
1438 }
1439
1440 ::exit(1);
1441 }
1442
1443 // Die immediately, no exit hook, no abort hook, no cleanup.
1444 void os::die() {
1445 ::abort(); // dump core (for debugging)
1446 }
1447
1448 // DLL functions
1449
1450 const char* os::dll_file_extension() { return ".so"; }
1451
1452 // This must be hard coded because it's the system's temporary
1453 // directory not the java application's temp directory, ala java.io.tmpdir.
1454 const char* os::get_temp_directory() { return "/tmp"; }
1455
1456 static bool file_exists(const char* filename) {
1457 struct stat statbuf;
1458 if (filename == NULL || strlen(filename) == 0) {
1459 return false;
1460 }
1461 return os::stat(filename, &statbuf) == 0;
1462 }
1463
1464 bool os::dll_build_name(char* buffer, size_t buflen,
1465 const char* pname, const char* fname) {
1466 bool retval = false;
1467 const size_t pnamelen = pname ? strlen(pname) : 0;
1468
1469 // Return error on buffer overflow.
1470 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1471 return retval;
1472 }
1473
1474 if (pnamelen == 0) {
1475 snprintf(buffer, buflen, "lib%s.so", fname);
1476 retval = true;
1477 } else if (strchr(pname, *os::path_separator()) != NULL) {
1478 int n;
1479 char** pelements = split_path(pname, &n);
1480 if (pelements == NULL) {
1481 return false;
1482 }
1483 for (int i = 0; i < n; i++) {
1484 // really shouldn't be NULL but what the heck, check can't hurt
1485 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1486 continue; // skip the empty path values
1487 }
1488 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1489 if (file_exists(buffer)) {
1490 retval = true;
1491 break;
1492 }
1493 }
1494 // release the storage
1495 for (int i = 0; i < n; i++) {
1496 if (pelements[i] != NULL) {
1497 FREE_C_HEAP_ARRAY(char, pelements[i]);
1498 }
1499 }
1500 if (pelements != NULL) {
1501 FREE_C_HEAP_ARRAY(char*, pelements);
1502 }
1503 } else {
1504 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1505 retval = true;
1506 }
1507 return retval;
1508 }
1509
1510 // check if addr is inside libjvm.so
1511 bool os::address_is_in_vm(address addr) {
1512 static address libjvm_base_addr;
1513 Dl_info dlinfo;
1514
1515 if (libjvm_base_addr == NULL) {
1516 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) {
1517 libjvm_base_addr = (address)dlinfo.dli_fbase;
1518 }
1519 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
1520 }
1521
1522 if (dladdr((void *)addr, &dlinfo) != 0) {
1523 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
1524 }
1525
1526 return false;
1527 }
1528
1529 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int);
1530 static dladdr1_func_type dladdr1_func = NULL;
1531
1532 bool os::dll_address_to_function_name(address addr, char *buf,
1533 int buflen, int * offset,
1534 bool demangle) {
1535 // buf is not optional, but offset is optional
1536 assert(buf != NULL, "sanity check");
1537
1538 Dl_info dlinfo;
1539
1540 // dladdr1_func was initialized in os::init()
1541 if (dladdr1_func != NULL) {
1542 // yes, we have dladdr1
1543
1544 // Support for dladdr1 is checked at runtime; it may be
1545 // available even if the vm is built on a machine that does
1546 // not have dladdr1 support. Make sure there is a value for
1547 // RTLD_DL_SYMENT.
1548 #ifndef RTLD_DL_SYMENT
1549 #define RTLD_DL_SYMENT 1
1550 #endif
1551 #ifdef _LP64
1552 Elf64_Sym * info;
1553 #else
1554 Elf32_Sym * info;
1555 #endif
1556 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info,
1557 RTLD_DL_SYMENT) != 0) {
1558 // see if we have a matching symbol that covers our address
1559 if (dlinfo.dli_saddr != NULL &&
1560 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) {
1561 if (dlinfo.dli_sname != NULL) {
1562 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1563 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
1564 }
1565 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1566 return true;
1567 }
1568 }
1569 // no matching symbol so try for just file info
1570 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1571 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1572 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1573 return true;
1574 }
1575 }
1576 }
1577 buf[0] = '\0';
1578 if (offset != NULL) *offset = -1;
1579 return false;
1580 }
1581
1582 // no, only dladdr is available
1583 if (dladdr((void *)addr, &dlinfo) != 0) {
1584 // see if we have a matching symbol
1585 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) {
1586 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) {
1587 jio_snprintf(buf, buflen, dlinfo.dli_sname);
1588 }
1589 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
1590 return true;
1591 }
1592 // no matching symbol so try for just file info
1593 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) {
1594 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
1595 buf, buflen, offset, dlinfo.dli_fname, demangle)) {
1596 return true;
1597 }
1598 }
1599 }
1600 buf[0] = '\0';
1601 if (offset != NULL) *offset = -1;
1602 return false;
1603 }
1604
1605 bool os::dll_address_to_library_name(address addr, char* buf,
1606 int buflen, int* offset) {
1607 // buf is not optional, but offset is optional
1608 assert(buf != NULL, "sanity check");
1609
1610 Dl_info dlinfo;
1611
1612 if (dladdr((void*)addr, &dlinfo) != 0) {
1613 if (dlinfo.dli_fname != NULL) {
1614 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
1615 }
1616 if (dlinfo.dli_fbase != NULL && offset != NULL) {
1617 *offset = addr - (address)dlinfo.dli_fbase;
1618 }
1619 return true;
1620 }
1621
1622 buf[0] = '\0';
1623 if (offset) *offset = -1;
1624 return false;
1625 }
1626
1627 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1628 Dl_info dli;
1629 // Sanity check?
1630 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 ||
1631 dli.dli_fname == NULL) {
1632 return 1;
1633 }
1634
1635 void * handle = dlopen(dli.dli_fname, RTLD_LAZY);
1636 if (handle == NULL) {
1637 return 1;
1638 }
1639
1640 Link_map *map;
1641 dlinfo(handle, RTLD_DI_LINKMAP, &map);
1642 if (map == NULL) {
1643 dlclose(handle);
1644 return 1;
1645 }
1646
1647 while (map->l_prev != NULL) {
1648 map = map->l_prev;
1649 }
1650
1651 while (map != NULL) {
1652 // Iterate through all map entries and call callback with fields of interest
1653 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) {
1654 dlclose(handle);
1655 return 1;
1656 }
1657 map = map->l_next;
1658 }
1659
1660 dlclose(handle);
1661 return 0;
1662 }
1663
1664 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) {
1665 outputStream * out = (outputStream *) param;
1666 out->print_cr(PTR_FORMAT " \t%s", base_address, name);
1667 return 0;
1668 }
1669
1670 void os::print_dll_info(outputStream * st) {
1671 st->print_cr("Dynamic libraries:"); st->flush();
1672 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) {
1673 st->print_cr("Error: Cannot print dynamic libraries.");
1674 }
1675 }
1676
1677 // Loads .dll/.so and
1678 // in case of error it checks if .dll/.so was built for the
1679 // same architecture as Hotspot is running on
1680
1681 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1682 void * result= ::dlopen(filename, RTLD_LAZY);
1683 if (result != NULL) {
1684 // Successful loading
1685 return result;
1686 }
1687
1688 Elf32_Ehdr elf_head;
1689
1690 // Read system error message into ebuf
1691 // It may or may not be overwritten below
1692 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
1693 ebuf[ebuflen-1]='\0';
1694 int diag_msg_max_length=ebuflen-strlen(ebuf);
1695 char* diag_msg_buf=ebuf+strlen(ebuf);
1696
1697 if (diag_msg_max_length==0) {
1698 // No more space in ebuf for additional diagnostics message
1699 return NULL;
1700 }
1701
1702
1703 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
1704
1705 if (file_descriptor < 0) {
1706 // Can't open library, report dlerror() message
1707 return NULL;
1708 }
1709
1710 bool failed_to_read_elf_head=
1711 (sizeof(elf_head)!=
1712 (::read(file_descriptor, &elf_head,sizeof(elf_head))));
1713
1714 ::close(file_descriptor);
1715 if (failed_to_read_elf_head) {
1716 // file i/o error - report dlerror() msg
1717 return NULL;
1718 }
1719
1720 typedef struct {
1721 Elf32_Half code; // Actual value as defined in elf.h
1722 Elf32_Half compat_class; // Compatibility of archs at VM's sense
1723 char elf_class; // 32 or 64 bit
1724 char endianess; // MSB or LSB
1725 char* name; // String representation
1726 } arch_t;
1727
1728 static const arch_t arch_array[]={
1729 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1730 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
1731 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
1732 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
1733 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1734 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
1735 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
1736 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
1737 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
1738 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"}
1739 };
1740
1741 #if (defined IA32)
1742 static Elf32_Half running_arch_code=EM_386;
1743 #elif (defined AMD64)
1744 static Elf32_Half running_arch_code=EM_X86_64;
1745 #elif (defined IA64)
1746 static Elf32_Half running_arch_code=EM_IA_64;
1747 #elif (defined __sparc) && (defined _LP64)
1748 static Elf32_Half running_arch_code=EM_SPARCV9;
1749 #elif (defined __sparc) && (!defined _LP64)
1750 static Elf32_Half running_arch_code=EM_SPARC;
1751 #elif (defined __powerpc64__)
1752 static Elf32_Half running_arch_code=EM_PPC64;
1753 #elif (defined __powerpc__)
1754 static Elf32_Half running_arch_code=EM_PPC;
1755 #elif (defined ARM)
1756 static Elf32_Half running_arch_code=EM_ARM;
1757 #else
1758 #error Method os::dll_load requires that one of following is defined:\
1759 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM
1760 #endif
1761
1762 // Identify compatability class for VM's architecture and library's architecture
1763 // Obtain string descriptions for architectures
1764
1765 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
1766 int running_arch_index=-1;
1767
1768 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) {
1769 if (running_arch_code == arch_array[i].code) {
1770 running_arch_index = i;
1771 }
1772 if (lib_arch.code == arch_array[i].code) {
1773 lib_arch.compat_class = arch_array[i].compat_class;
1774 lib_arch.name = arch_array[i].name;
1775 }
1776 }
1777
1778 assert(running_arch_index != -1,
1779 "Didn't find running architecture code (running_arch_code) in arch_array");
1780 if (running_arch_index == -1) {
1781 // Even though running architecture detection failed
1782 // we may still continue with reporting dlerror() message
1783 return NULL;
1784 }
1785
1786 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
1787 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
1788 return NULL;
1789 }
1790
1791 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
1792 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
1793 return NULL;
1794 }
1795
1796 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
1797 if (lib_arch.name!=NULL) {
1798 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1799 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
1800 lib_arch.name, arch_array[running_arch_index].name);
1801 } else {
1802 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
1803 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
1804 lib_arch.code,
1805 arch_array[running_arch_index].name);
1806 }
1807 }
1808
1809 return NULL;
1810 }
1811
1812 void* os::dll_lookup(void* handle, const char* name) {
1813 return dlsym(handle, name);
1814 }
1815
1816 void* os::get_default_process_handle() {
1817 return (void*)::dlopen(NULL, RTLD_LAZY);
1818 }
1819
1820 int os::stat(const char *path, struct stat *sbuf) {
1821 char pathbuf[MAX_PATH];
1822 if (strlen(path) > MAX_PATH - 1) {
1823 errno = ENAMETOOLONG;
1824 return -1;
1825 }
1826 os::native_path(strcpy(pathbuf, path));
1827 return ::stat(pathbuf, sbuf);
1828 }
1829
1830 static inline time_t get_mtime(const char* filename) {
1831 struct stat st;
1832 int ret = os::stat(filename, &st);
1833 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
1834 return st.st_mtime;
1835 }
1836
1837 int os::compare_file_modified_times(const char* file1, const char* file2) {
1838 time_t t1 = get_mtime(file1);
1839 time_t t2 = get_mtime(file2);
1840 return t1 - t2;
1841 }
1842
1843 static bool _print_ascii_file(const char* filename, outputStream* st) {
1844 int fd = ::open(filename, O_RDONLY);
1845 if (fd == -1) {
1846 return false;
1847 }
1848
1849 char buf[32];
1850 int bytes;
1851 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
1852 st->print_raw(buf, bytes);
1853 }
1854
1855 ::close(fd);
1856
1857 return true;
1858 }
1859
1860 void os::print_os_info_brief(outputStream* st) {
1861 os::Solaris::print_distro_info(st);
1862
1863 os::Posix::print_uname_info(st);
1864
1865 os::Solaris::print_libversion_info(st);
1866 }
1867
1868 void os::print_os_info(outputStream* st) {
1869 st->print("OS:");
1870
1871 os::Solaris::print_distro_info(st);
1872
1873 os::Posix::print_uname_info(st);
1874
1875 os::Solaris::print_libversion_info(st);
1876
1877 os::Posix::print_rlimit_info(st);
1878
1879 os::Posix::print_load_average(st);
1880 }
1881
1882 void os::Solaris::print_distro_info(outputStream* st) {
1883 if (!_print_ascii_file("/etc/release", st)) {
1884 st->print("Solaris");
1885 }
1886 st->cr();
1887 }
1888
1889 void os::get_summary_os_info(char* buf, size_t buflen) {
1890 strncpy(buf, "Solaris", buflen); // default to plain solaris
1891 FILE* fp = fopen("/etc/release", "r");
1892 if (fp != NULL) {
1893 char tmp[256];
1894 // Only get the first line and chop out everything but the os name.
1895 if (fgets(tmp, sizeof(tmp), fp)) {
1896 char* ptr = tmp;
1897 // skip past whitespace characters
1898 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++;
1899 if (*ptr != '\0') {
1900 char* nl = strchr(ptr, '\n');
1901 if (nl != NULL) *nl = '\0';
1902 strncpy(buf, ptr, buflen);
1903 }
1904 }
1905 fclose(fp);
1906 }
1907 }
1908
1909 void os::Solaris::print_libversion_info(outputStream* st) {
1910 st->print(" (T2 libthread)");
1911 st->cr();
1912 }
1913
1914 static bool check_addr0(outputStream* st) {
1915 jboolean status = false;
1916 const int read_chunk = 200;
1917 int ret = 0;
1918 int nmap = 0;
1919 int fd = ::open("/proc/self/map",O_RDONLY);
1920 if (fd >= 0) {
1921 prmap_t *p = NULL;
1922 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t));
1923 if (NULL == mbuff) {
1924 ::close(fd);
1925 return status;
1926 }
1927 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
1928 //check if read() has not read partial data
1929 if( 0 != ret % sizeof(prmap_t)){
1930 break;
1931 }
1932 nmap = ret / sizeof(prmap_t);
1933 p = (prmap_t *)mbuff;
1934 for(int i = 0; i < nmap; i++){
1935 if (p->pr_vaddr == 0x0) {
1936 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024);
1937 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
1938 st->print("Access: ");
1939 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
1940 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
1941 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
1942 st->cr();
1943 status = true;
1944 }
1945 p++;
1946 }
1947 }
1948 free(mbuff);
1949 ::close(fd);
1950 }
1951 return status;
1952 }
1953
1954 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1955 // Get MHz with system call. We don't seem to already have this.
1956 processor_info_t stats;
1957 processorid_t id = getcpuid();
1958 int clock = 0;
1959 if (processor_info(id, &stats) != -1) {
1960 clock = stats.pi_clock; // pi_processor_type isn't more informative than below
1961 }
1962 #ifdef AMD64
1963 snprintf(buf, buflen, "x86 64 bit %d MHz", clock);
1964 #else
1965 // must be sparc
1966 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock);
1967 #endif
1968 }
1969
1970 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1971 // Nothing to do for now.
1972 }
1973
1974 void os::print_memory_info(outputStream* st) {
1975 st->print("Memory:");
1976 st->print(" %dk page", os::vm_page_size()>>10);
1977 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10);
1978 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10);
1979 st->cr();
1980 (void) check_addr0(st);
1981 }
1982
1983 // Moved from whole group, because we need them here for diagnostic
1984 // prints.
1985 #define OLDMAXSIGNUM 32
1986 static int Maxsignum = 0;
1987 static int *ourSigFlags = NULL;
1988
1989 int os::Solaris::get_our_sigflags(int sig) {
1990 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1991 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1992 return ourSigFlags[sig];
1993 }
1994
1995 void os::Solaris::set_our_sigflags(int sig, int flags) {
1996 assert(ourSigFlags!=NULL, "signal data structure not initialized");
1997 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range");
1998 ourSigFlags[sig] = flags;
1999 }
2000
2001
2002 static const char* get_signal_handler_name(address handler,
2003 char* buf, int buflen) {
2004 int offset;
2005 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
2006 if (found) {
2007 // skip directory names
2008 const char *p1, *p2;
2009 p1 = buf;
2010 size_t len = strlen(os::file_separator());
2011 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
2012 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset);
2013 } else {
2014 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
2015 }
2016 return buf;
2017 }
2018
2019 static void print_signal_handler(outputStream* st, int sig,
2020 char* buf, size_t buflen) {
2021 struct sigaction sa;
2022
2023 sigaction(sig, NULL, &sa);
2024
2025 st->print("%s: ", os::exception_name(sig, buf, buflen));
2026
2027 address handler = (sa.sa_flags & SA_SIGINFO)
2028 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
2029 : CAST_FROM_FN_PTR(address, sa.sa_handler);
2030
2031 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
2032 st->print("SIG_DFL");
2033 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
2034 st->print("SIG_IGN");
2035 } else {
2036 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
2037 }
2038
2039 st->print(", sa_mask[0]=");
2040 os::Posix::print_signal_set_short(st, &sa.sa_mask);
2041
2042 address rh = VMError::get_resetted_sighandler(sig);
2043 // May be, handler was resetted by VMError?
2044 if (rh != NULL) {
2045 handler = rh;
2046 sa.sa_flags = VMError::get_resetted_sigflags(sig);
2047 }
2048
2049 st->print(", sa_flags=");
2050 os::Posix::print_sa_flags(st, sa.sa_flags);
2051
2052 // Check: is it our handler?
2053 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) {
2054 // It is our signal handler
2055 // check for flags
2056 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) {
2057 st->print(
2058 ", flags was changed from " PTR32_FORMAT ", consider using jsig library",
2059 os::Solaris::get_our_sigflags(sig));
2060 }
2061 }
2062 st->cr();
2063 }
2064
2065 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
2066 st->print_cr("Signal Handlers:");
2067 print_signal_handler(st, SIGSEGV, buf, buflen);
2068 print_signal_handler(st, SIGBUS , buf, buflen);
2069 print_signal_handler(st, SIGFPE , buf, buflen);
2070 print_signal_handler(st, SIGPIPE, buf, buflen);
2071 print_signal_handler(st, SIGXFSZ, buf, buflen);
2072 print_signal_handler(st, SIGILL , buf, buflen);
2073 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen);
2074 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
2075 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen);
2076 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
2077 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen);
2078 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen);
2079 }
2080
2081 static char saved_jvm_path[MAXPATHLEN] = { 0 };
2082
2083 // Find the full path to the current module, libjvm.so
2084 void os::jvm_path(char *buf, jint buflen) {
2085 // Error checking.
2086 if (buflen < MAXPATHLEN) {
2087 assert(false, "must use a large-enough buffer");
2088 buf[0] = '\0';
2089 return;
2090 }
2091 // Lazy resolve the path to current module.
2092 if (saved_jvm_path[0] != 0) {
2093 strcpy(buf, saved_jvm_path);
2094 return;
2095 }
2096
2097 Dl_info dlinfo;
2098 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
2099 assert(ret != 0, "cannot locate libjvm");
2100 if (ret != 0 && dlinfo.dli_fname != NULL) {
2101 realpath((char *)dlinfo.dli_fname, buf);
2102 } else {
2103 buf[0] = '\0';
2104 return;
2105 }
2106
2107 if (Arguments::sun_java_launcher_is_altjvm()) {
2108 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
2109 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so".
2110 // If "/jre/lib/" appears at the right place in the string, then
2111 // assume we are installed in a JDK and we're done. Otherwise, check
2112 // for a JAVA_HOME environment variable and fix up the path so it
2113 // looks like libjvm.so is installed there (append a fake suffix
2114 // hotspot/libjvm.so).
2115 const char *p = buf + strlen(buf) - 1;
2116 for (int count = 0; p > buf && count < 5; ++count) {
2117 for (--p; p > buf && *p != '/'; --p)
2118 /* empty */ ;
2119 }
2120
2121 if (strncmp(p, "/jre/lib/", 9) != 0) {
2122 // Look for JAVA_HOME in the environment.
2123 char* java_home_var = ::getenv("JAVA_HOME");
2124 if (java_home_var != NULL && java_home_var[0] != 0) {
2125 char cpu_arch[12];
2126 char* jrelib_p;
2127 int len;
2128 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch));
2129 #ifdef _LP64
2130 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9.
2131 if (strcmp(cpu_arch, "sparc") == 0) {
2132 strcat(cpu_arch, "v9");
2133 } else if (strcmp(cpu_arch, "i386") == 0) {
2134 strcpy(cpu_arch, "amd64");
2135 }
2136 #endif
2137 // Check the current module name "libjvm.so".
2138 p = strrchr(buf, '/');
2139 assert(strstr(p, "/libjvm") == p, "invalid library name");
2140
2141 realpath(java_home_var, buf);
2142 // determine if this is a legacy image or modules image
2143 // modules image doesn't have "jre" subdirectory
2144 len = strlen(buf);
2145 assert(len < buflen, "Ran out of buffer space");
2146 jrelib_p = buf + len;
2147 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch);
2148 if (0 != access(buf, F_OK)) {
2149 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch);
2150 }
2151
2152 if (0 == access(buf, F_OK)) {
2153 // Use current module name "libjvm.so"
2154 len = strlen(buf);
2155 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
2156 } else {
2157 // Go back to path of .so
2158 realpath((char *)dlinfo.dli_fname, buf);
2159 }
2160 }
2161 }
2162 }
2163
2164 strncpy(saved_jvm_path, buf, MAXPATHLEN);
2165 saved_jvm_path[MAXPATHLEN - 1] = '\0';
2166 }
2167
2168
2169 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
2170 // no prefix required, not even "_"
2171 }
2172
2173
2174 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
2175 // no suffix required
2176 }
2177
2178 // This method is a copy of JDK's sysGetLastErrorString
2179 // from src/solaris/hpi/src/system_md.c
2180
2181 size_t os::lasterror(char *buf, size_t len) {
2182 if (errno == 0) return 0;
2183
2184 const char *s = os::strerror(errno);
2185 size_t n = ::strlen(s);
2186 if (n >= len) {
2187 n = len - 1;
2188 }
2189 ::strncpy(buf, s, n);
2190 buf[n] = '\0';
2191 return n;
2192 }
2193
2194
2195 // sun.misc.Signal
2196
2197 extern "C" {
2198 static void UserHandler(int sig, void *siginfo, void *context) {
2199 // Ctrl-C is pressed during error reporting, likely because the error
2200 // handler fails to abort. Let VM die immediately.
2201 if (sig == SIGINT && is_error_reported()) {
2202 os::die();
2203 }
2204
2205 os::signal_notify(sig);
2206 // We do not need to reinstate the signal handler each time...
2207 }
2208 }
2209
2210 void* os::user_handler() {
2211 return CAST_FROM_FN_PTR(void*, UserHandler);
2212 }
2213
2214 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
2215 struct timespec ts;
2216 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
2217
2218 return ts;
2219 }
2220
2221 extern "C" {
2222 typedef void (*sa_handler_t)(int);
2223 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
2224 }
2225
2226 void* os::signal(int signal_number, void* handler) {
2227 struct sigaction sigAct, oldSigAct;
2228 sigfillset(&(sigAct.sa_mask));
2229 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND;
2230 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
2231
2232 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
2233 // -1 means registration failed
2234 return (void *)-1;
2235 }
2236
2237 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
2238 }
2239
2240 void os::signal_raise(int signal_number) {
2241 raise(signal_number);
2242 }
2243
2244 // The following code is moved from os.cpp for making this
2245 // code platform specific, which it is by its very nature.
2246
2247 // a counter for each possible signal value
2248 static int Sigexit = 0;
2249 static int Maxlibjsigsigs;
2250 static jint *pending_signals = NULL;
2251 static int *preinstalled_sigs = NULL;
2252 static struct sigaction *chainedsigactions = NULL;
2253 static sema_t sig_sem;
2254 typedef int (*version_getting_t)();
2255 version_getting_t os::Solaris::get_libjsig_version = NULL;
2256 static int libjsigversion = NULL;
2257
2258 int os::sigexitnum_pd() {
2259 assert(Sigexit > 0, "signal memory not yet initialized");
2260 return Sigexit;
2261 }
2262
2263 void os::Solaris::init_signal_mem() {
2264 // Initialize signal structures
2265 Maxsignum = SIGRTMAX;
2266 Sigexit = Maxsignum+1;
2267 assert(Maxsignum >0, "Unable to obtain max signal number");
2268
2269 Maxlibjsigsigs = Maxsignum;
2270
2271 // pending_signals has one int per signal
2272 // The additional signal is for SIGEXIT - exit signal to signal_thread
2273 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal);
2274 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1)));
2275
2276 if (UseSignalChaining) {
2277 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction)
2278 * (Maxsignum + 1), mtInternal);
2279 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1)));
2280 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2281 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1)));
2282 }
2283 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal);
2284 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1));
2285 }
2286
2287 void os::signal_init_pd() {
2288 int ret;
2289
2290 ret = ::sema_init(&sig_sem, 0, NULL, NULL);
2291 assert(ret == 0, "sema_init() failed");
2292 }
2293
2294 void os::signal_notify(int signal_number) {
2295 int ret;
2296
2297 Atomic::inc(&pending_signals[signal_number]);
2298 ret = ::sema_post(&sig_sem);
2299 assert(ret == 0, "sema_post() failed");
2300 }
2301
2302 static int check_pending_signals(bool wait_for_signal) {
2303 int ret;
2304 while (true) {
2305 for (int i = 0; i < Sigexit + 1; i++) {
2306 jint n = pending_signals[i];
2307 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
2308 return i;
2309 }
2310 }
2311 if (!wait_for_signal) {
2312 return -1;
2313 }
2314 JavaThread *thread = JavaThread::current();
2315 ThreadBlockInVM tbivm(thread);
2316
2317 bool threadIsSuspended;
2318 do {
2319 thread->set_suspend_equivalent();
2320 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
2321 while ((ret = ::sema_wait(&sig_sem)) == EINTR)
2322 ;
2323 assert(ret == 0, "sema_wait() failed");
2324
2325 // were we externally suspended while we were waiting?
2326 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
2327 if (threadIsSuspended) {
2328 // The semaphore has been incremented, but while we were waiting
2329 // another thread suspended us. We don't want to continue running
2330 // while suspended because that would surprise the thread that
2331 // suspended us.
2332 ret = ::sema_post(&sig_sem);
2333 assert(ret == 0, "sema_post() failed");
2334
2335 thread->java_suspend_self();
2336 }
2337 } while (threadIsSuspended);
2338 }
2339 }
2340
2341 int os::signal_lookup() {
2342 return check_pending_signals(false);
2343 }
2344
2345 int os::signal_wait() {
2346 return check_pending_signals(true);
2347 }
2348
2349 ////////////////////////////////////////////////////////////////////////////////
2350 // Virtual Memory
2351
2352 static int page_size = -1;
2353
2354 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will
2355 // clear this var if support is not available.
2356 static bool has_map_align = true;
2357
2358 int os::vm_page_size() {
2359 assert(page_size != -1, "must call os::init");
2360 return page_size;
2361 }
2362
2363 // Solaris allocates memory by pages.
2364 int os::vm_allocation_granularity() {
2365 assert(page_size != -1, "must call os::init");
2366 return page_size;
2367 }
2368
2369 static bool recoverable_mmap_error(int err) {
2370 // See if the error is one we can let the caller handle. This
2371 // list of errno values comes from the Solaris mmap(2) man page.
2372 switch (err) {
2373 case EBADF:
2374 case EINVAL:
2375 case ENOTSUP:
2376 // let the caller deal with these errors
2377 return true;
2378
2379 default:
2380 // Any remaining errors on this OS can cause our reserved mapping
2381 // to be lost. That can cause confusion where different data
2382 // structures think they have the same memory mapped. The worst
2383 // scenario is if both the VM and a library think they have the
2384 // same memory mapped.
2385 return false;
2386 }
2387 }
2388
2389 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec,
2390 int err) {
2391 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2392 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec,
2393 os::strerror(err), err);
2394 }
2395
2396 static void warn_fail_commit_memory(char* addr, size_t bytes,
2397 size_t alignment_hint, bool exec,
2398 int err) {
2399 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2400 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes,
2401 alignment_hint, exec, os::strerror(err), err);
2402 }
2403
2404 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) {
2405 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
2406 size_t size = bytes;
2407 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
2408 if (res != NULL) {
2409 if (UseNUMAInterleaving) {
2410 numa_make_global(addr, bytes);
2411 }
2412 return 0;
2413 }
2414
2415 int err = errno; // save errno from mmap() call in mmap_chunk()
2416
2417 if (!recoverable_mmap_error(err)) {
2418 warn_fail_commit_memory(addr, bytes, exec, err);
2419 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory.");
2420 }
2421
2422 return err;
2423 }
2424
2425 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) {
2426 return Solaris::commit_memory_impl(addr, bytes, exec) == 0;
2427 }
2428
2429 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec,
2430 const char* mesg) {
2431 assert(mesg != NULL, "mesg must be specified");
2432 int err = os::Solaris::commit_memory_impl(addr, bytes, exec);
2433 if (err != 0) {
2434 // the caller wants all commit errors to exit with the specified mesg:
2435 warn_fail_commit_memory(addr, bytes, exec, err);
2436 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2437 }
2438 }
2439
2440 size_t os::Solaris::page_size_for_alignment(size_t alignment) {
2441 assert(is_size_aligned(alignment, (size_t) vm_page_size()),
2442 SIZE_FORMAT " is not aligned to " SIZE_FORMAT,
2443 alignment, (size_t) vm_page_size());
2444
2445 for (int i = 0; _page_sizes[i] != 0; i++) {
2446 if (is_size_aligned(alignment, _page_sizes[i])) {
2447 return _page_sizes[i];
2448 }
2449 }
2450
2451 return (size_t) vm_page_size();
2452 }
2453
2454 int os::Solaris::commit_memory_impl(char* addr, size_t bytes,
2455 size_t alignment_hint, bool exec) {
2456 int err = Solaris::commit_memory_impl(addr, bytes, exec);
2457 if (err == 0 && UseLargePages && alignment_hint > 0) {
2458 assert(is_size_aligned(bytes, alignment_hint),
2459 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint);
2460
2461 // The syscall memcntl requires an exact page size (see man memcntl for details).
2462 size_t page_size = page_size_for_alignment(alignment_hint);
2463 if (page_size > (size_t) vm_page_size()) {
2464 (void)Solaris::setup_large_pages(addr, bytes, page_size);
2465 }
2466 }
2467 return err;
2468 }
2469
2470 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint,
2471 bool exec) {
2472 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0;
2473 }
2474
2475 void os::pd_commit_memory_or_exit(char* addr, size_t bytes,
2476 size_t alignment_hint, bool exec,
2477 const char* mesg) {
2478 assert(mesg != NULL, "mesg must be specified");
2479 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec);
2480 if (err != 0) {
2481 // the caller wants all commit errors to exit with the specified mesg:
2482 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err);
2483 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg);
2484 }
2485 }
2486
2487 // Uncommit the pages in a specified region.
2488 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) {
2489 if (madvise(addr, bytes, MADV_FREE) < 0) {
2490 debug_only(warning("MADV_FREE failed."));
2491 return;
2492 }
2493 }
2494
2495 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2496 return os::commit_memory(addr, size, !ExecMem);
2497 }
2498
2499 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2500 return os::uncommit_memory(addr, size);
2501 }
2502
2503 // Change the page size in a given range.
2504 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2505 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned.");
2506 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned.");
2507 if (UseLargePages) {
2508 size_t page_size = Solaris::page_size_for_alignment(alignment_hint);
2509 if (page_size > (size_t) vm_page_size()) {
2510 Solaris::setup_large_pages(addr, bytes, page_size);
2511 }
2512 }
2513 }
2514
2515 // Tell the OS to make the range local to the first-touching LWP
2516 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2517 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2518 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) {
2519 debug_only(warning("MADV_ACCESS_LWP failed."));
2520 }
2521 }
2522
2523 // Tell the OS that this range would be accessed from different LWPs.
2524 void os::numa_make_global(char *addr, size_t bytes) {
2525 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned.");
2526 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) {
2527 debug_only(warning("MADV_ACCESS_MANY failed."));
2528 }
2529 }
2530
2531 // Get the number of the locality groups.
2532 size_t os::numa_get_groups_num() {
2533 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie());
2534 return n != -1 ? n : 1;
2535 }
2536
2537 // Get a list of leaf locality groups. A leaf lgroup is group that
2538 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory
2539 // board. An LWP is assigned to one of these groups upon creation.
2540 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2541 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) {
2542 ids[0] = 0;
2543 return 1;
2544 }
2545 int result_size = 0, top = 1, bottom = 0, cur = 0;
2546 for (int k = 0; k < size; k++) {
2547 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur],
2548 (Solaris::lgrp_id_t*)&ids[top], size - top);
2549 if (r == -1) {
2550 ids[0] = 0;
2551 return 1;
2552 }
2553 if (!r) {
2554 // That's a leaf node.
2555 assert(bottom <= cur, "Sanity check");
2556 // Check if the node has memory
2557 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur],
2558 NULL, 0, LGRP_RSRC_MEM) > 0) {
2559 ids[bottom++] = ids[cur];
2560 }
2561 }
2562 top += r;
2563 cur++;
2564 }
2565 if (bottom == 0) {
2566 // Handle a situation, when the OS reports no memory available.
2567 // Assume UMA architecture.
2568 ids[0] = 0;
2569 return 1;
2570 }
2571 return bottom;
2572 }
2573
2574 // Detect the topology change. Typically happens during CPU plugging-unplugging.
2575 bool os::numa_topology_changed() {
2576 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie());
2577 if (is_stale != -1 && is_stale) {
2578 Solaris::lgrp_fini(Solaris::lgrp_cookie());
2579 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER);
2580 assert(c != 0, "Failure to initialize LGRP API");
2581 Solaris::set_lgrp_cookie(c);
2582 return true;
2583 }
2584 return false;
2585 }
2586
2587 // Get the group id of the current LWP.
2588 int os::numa_get_group_id() {
2589 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID);
2590 if (lgrp_id == -1) {
2591 return 0;
2592 }
2593 const int size = os::numa_get_groups_num();
2594 int *ids = (int*)alloca(size * sizeof(int));
2595
2596 // Get the ids of all lgroups with memory; r is the count.
2597 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id,
2598 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM);
2599 if (r <= 0) {
2600 return 0;
2601 }
2602 return ids[os::random() % r];
2603 }
2604
2605 // Request information about the page.
2606 bool os::get_page_info(char *start, page_info* info) {
2607 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2608 uint64_t addr = (uintptr_t)start;
2609 uint64_t outdata[2];
2610 uint_t validity = 0;
2611
2612 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) {
2613 return false;
2614 }
2615
2616 info->size = 0;
2617 info->lgrp_id = -1;
2618
2619 if ((validity & 1) != 0) {
2620 if ((validity & 2) != 0) {
2621 info->lgrp_id = outdata[0];
2622 }
2623 if ((validity & 4) != 0) {
2624 info->size = outdata[1];
2625 }
2626 return true;
2627 }
2628 return false;
2629 }
2630
2631 // Scan the pages from start to end until a page different than
2632 // the one described in the info parameter is encountered.
2633 char *os::scan_pages(char *start, char* end, page_info* page_expected,
2634 page_info* page_found) {
2635 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE };
2636 const size_t types = sizeof(info_types) / sizeof(info_types[0]);
2637 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1];
2638 uint_t validity[MAX_MEMINFO_CNT];
2639
2640 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size);
2641 uint64_t p = (uint64_t)start;
2642 while (p < (uint64_t)end) {
2643 addrs[0] = p;
2644 size_t addrs_count = 1;
2645 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) {
2646 addrs[addrs_count] = addrs[addrs_count - 1] + page_size;
2647 addrs_count++;
2648 }
2649
2650 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) {
2651 return NULL;
2652 }
2653
2654 size_t i = 0;
2655 for (; i < addrs_count; i++) {
2656 if ((validity[i] & 1) != 0) {
2657 if ((validity[i] & 4) != 0) {
2658 if (outdata[types * i + 1] != page_expected->size) {
2659 break;
2660 }
2661 } else if (page_expected->size != 0) {
2662 break;
2663 }
2664
2665 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) {
2666 if (outdata[types * i] != page_expected->lgrp_id) {
2667 break;
2668 }
2669 }
2670 } else {
2671 return NULL;
2672 }
2673 }
2674
2675 if (i < addrs_count) {
2676 if ((validity[i] & 2) != 0) {
2677 page_found->lgrp_id = outdata[types * i];
2678 } else {
2679 page_found->lgrp_id = -1;
2680 }
2681 if ((validity[i] & 4) != 0) {
2682 page_found->size = outdata[types * i + 1];
2683 } else {
2684 page_found->size = 0;
2685 }
2686 return (char*)addrs[i];
2687 }
2688
2689 p = addrs[addrs_count - 1] + page_size;
2690 }
2691 return end;
2692 }
2693
2694 bool os::pd_uncommit_memory(char* addr, size_t bytes) {
2695 size_t size = bytes;
2696 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2697 // uncommitted page. Otherwise, the read/write might succeed if we
2698 // have enough swap space to back the physical page.
2699 return
2700 NULL != Solaris::mmap_chunk(addr, size,
2701 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE,
2702 PROT_NONE);
2703 }
2704
2705 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) {
2706 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0);
2707
2708 if (b == MAP_FAILED) {
2709 return NULL;
2710 }
2711 return b;
2712 }
2713
2714 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes,
2715 size_t alignment_hint, bool fixed) {
2716 char* addr = requested_addr;
2717 int flags = MAP_PRIVATE | MAP_NORESERVE;
2718
2719 assert(!(fixed && (alignment_hint > 0)),
2720 "alignment hint meaningless with fixed mmap");
2721
2722 if (fixed) {
2723 flags |= MAP_FIXED;
2724 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) {
2725 flags |= MAP_ALIGN;
2726 addr = (char*) alignment_hint;
2727 }
2728
2729 // Map uncommitted pages PROT_NONE so we fail early if we touch an
2730 // uncommitted page. Otherwise, the read/write might succeed if we
2731 // have enough swap space to back the physical page.
2732 return mmap_chunk(addr, bytes, flags, PROT_NONE);
2733 }
2734
2735 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
2736 size_t alignment_hint) {
2737 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint,
2738 (requested_addr != NULL));
2739
2740 guarantee(requested_addr == NULL || requested_addr == addr,
2741 "OS failed to return requested mmap address.");
2742 return addr;
2743 }
2744
2745 // Reserve memory at an arbitrary address, only if that area is
2746 // available (and not reserved for something else).
2747
2748 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2749 const int max_tries = 10;
2750 char* base[max_tries];
2751 size_t size[max_tries];
2752
2753 // Solaris adds a gap between mmap'ed regions. The size of the gap
2754 // is dependent on the requested size and the MMU. Our initial gap
2755 // value here is just a guess and will be corrected later.
2756 bool had_top_overlap = false;
2757 bool have_adjusted_gap = false;
2758 size_t gap = 0x400000;
2759
2760 // Assert only that the size is a multiple of the page size, since
2761 // that's all that mmap requires, and since that's all we really know
2762 // about at this low abstraction level. If we need higher alignment,
2763 // we can either pass an alignment to this method or verify alignment
2764 // in one of the methods further up the call chain. See bug 5044738.
2765 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
2766
2767 // Since snv_84, Solaris attempts to honor the address hint - see 5003415.
2768 // Give it a try, if the kernel honors the hint we can return immediately.
2769 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false);
2770
2771 volatile int err = errno;
2772 if (addr == requested_addr) {
2773 return addr;
2774 } else if (addr != NULL) {
2775 pd_unmap_memory(addr, bytes);
2776 }
2777
2778 if (log_is_enabled(Warning, os)) {
2779 char buf[256];
2780 buf[0] = '\0';
2781 if (addr == NULL) {
2782 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err));
2783 }
2784 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at "
2785 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT
2786 "%s", bytes, requested_addr, addr, buf);
2787 }
2788
2789 // Address hint method didn't work. Fall back to the old method.
2790 // In theory, once SNV becomes our oldest supported platform, this
2791 // code will no longer be needed.
2792 //
2793 // Repeatedly allocate blocks until the block is allocated at the
2794 // right spot. Give up after max_tries.
2795 int i;
2796 for (i = 0; i < max_tries; ++i) {
2797 base[i] = reserve_memory(bytes);
2798
2799 if (base[i] != NULL) {
2800 // Is this the block we wanted?
2801 if (base[i] == requested_addr) {
2802 size[i] = bytes;
2803 break;
2804 }
2805
2806 // check that the gap value is right
2807 if (had_top_overlap && !have_adjusted_gap) {
2808 size_t actual_gap = base[i-1] - base[i] - bytes;
2809 if (gap != actual_gap) {
2810 // adjust the gap value and retry the last 2 allocations
2811 assert(i > 0, "gap adjustment code problem");
2812 have_adjusted_gap = true; // adjust the gap only once, just in case
2813 gap = actual_gap;
2814 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap);
2815 unmap_memory(base[i], bytes);
2816 unmap_memory(base[i-1], size[i-1]);
2817 i-=2;
2818 continue;
2819 }
2820 }
2821
2822 // Does this overlap the block we wanted? Give back the overlapped
2823 // parts and try again.
2824 //
2825 // There is still a bug in this code: if top_overlap == bytes,
2826 // the overlap is offset from requested region by the value of gap.
2827 // In this case giving back the overlapped part will not work,
2828 // because we'll give back the entire block at base[i] and
2829 // therefore the subsequent allocation will not generate a new gap.
2830 // This could be fixed with a new algorithm that used larger
2831 // or variable size chunks to find the requested region -
2832 // but such a change would introduce additional complications.
2833 // It's rare enough that the planets align for this bug,
2834 // so we'll just wait for a fix for 6204603/5003415 which
2835 // will provide a mmap flag to allow us to avoid this business.
2836
2837 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
2838 if (top_overlap >= 0 && top_overlap < bytes) {
2839 had_top_overlap = true;
2840 unmap_memory(base[i], top_overlap);
2841 base[i] += top_overlap;
2842 size[i] = bytes - top_overlap;
2843 } else {
2844 size_t bottom_overlap = base[i] + bytes - requested_addr;
2845 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
2846 if (bottom_overlap == 0) {
2847 log_info(os)("attempt_reserve_memory_at: possible alignment bug");
2848 }
2849 unmap_memory(requested_addr, bottom_overlap);
2850 size[i] = bytes - bottom_overlap;
2851 } else {
2852 size[i] = bytes;
2853 }
2854 }
2855 }
2856 }
2857
2858 // Give back the unused reserved pieces.
2859
2860 for (int j = 0; j < i; ++j) {
2861 if (base[j] != NULL) {
2862 unmap_memory(base[j], size[j]);
2863 }
2864 }
2865
2866 return (i < max_tries) ? requested_addr : NULL;
2867 }
2868
2869 bool os::pd_release_memory(char* addr, size_t bytes) {
2870 size_t size = bytes;
2871 return munmap(addr, size) == 0;
2872 }
2873
2874 static bool solaris_mprotect(char* addr, size_t bytes, int prot) {
2875 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()),
2876 "addr must be page aligned");
2877 int retVal = mprotect(addr, bytes, prot);
2878 return retVal == 0;
2879 }
2880
2881 // Protect memory (Used to pass readonly pages through
2882 // JNI GetArray<type>Elements with empty arrays.)
2883 // Also, used for serialization page and for compressed oops null pointer
2884 // checking.
2885 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
2886 bool is_committed) {
2887 unsigned int p = 0;
2888 switch (prot) {
2889 case MEM_PROT_NONE: p = PROT_NONE; break;
2890 case MEM_PROT_READ: p = PROT_READ; break;
2891 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2892 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2893 default:
2894 ShouldNotReachHere();
2895 }
2896 // is_committed is unused.
2897 return solaris_mprotect(addr, bytes, p);
2898 }
2899
2900 // guard_memory and unguard_memory only happens within stack guard pages.
2901 // Since ISM pertains only to the heap, guard and unguard memory should not
2902 /// happen with an ISM region.
2903 bool os::guard_memory(char* addr, size_t bytes) {
2904 return solaris_mprotect(addr, bytes, PROT_NONE);
2905 }
2906
2907 bool os::unguard_memory(char* addr, size_t bytes) {
2908 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE);
2909 }
2910
2911 // Large page support
2912 static size_t _large_page_size = 0;
2913
2914 // Insertion sort for small arrays (descending order).
2915 static void insertion_sort_descending(size_t* array, int len) {
2916 for (int i = 0; i < len; i++) {
2917 size_t val = array[i];
2918 for (size_t key = i; key > 0 && array[key - 1] < val; --key) {
2919 size_t tmp = array[key];
2920 array[key] = array[key - 1];
2921 array[key - 1] = tmp;
2922 }
2923 }
2924 }
2925
2926 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) {
2927 const unsigned int usable_count = VM_Version::page_size_count();
2928 if (usable_count == 1) {
2929 return false;
2930 }
2931
2932 // Find the right getpagesizes interface. When solaris 11 is the minimum
2933 // build platform, getpagesizes() (without the '2') can be called directly.
2934 typedef int (*gps_t)(size_t[], int);
2935 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
2936 if (gps_func == NULL) {
2937 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
2938 if (gps_func == NULL) {
2939 if (warn) {
2940 warning("MPSS is not supported by the operating system.");
2941 }
2942 return false;
2943 }
2944 }
2945
2946 // Fill the array of page sizes.
2947 int n = (*gps_func)(_page_sizes, page_sizes_max);
2948 assert(n > 0, "Solaris bug?");
2949
2950 if (n == page_sizes_max) {
2951 // Add a sentinel value (necessary only if the array was completely filled
2952 // since it is static (zeroed at initialization)).
2953 _page_sizes[--n] = 0;
2954 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
2955 }
2956 assert(_page_sizes[n] == 0, "missing sentinel");
2957 trace_page_sizes("available page sizes", _page_sizes, n);
2958
2959 if (n == 1) return false; // Only one page size available.
2960
2961 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and
2962 // select up to usable_count elements. First sort the array, find the first
2963 // acceptable value, then copy the usable sizes to the top of the array and
2964 // trim the rest. Make sure to include the default page size :-).
2965 //
2966 // A better policy could get rid of the 4M limit by taking the sizes of the
2967 // important VM memory regions (java heap and possibly the code cache) into
2968 // account.
2969 insertion_sort_descending(_page_sizes, n);
2970 const size_t size_limit =
2971 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes;
2972 int beg;
2973 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */;
2974 const int end = MIN2((int)usable_count, n) - 1;
2975 for (int cur = 0; cur < end; ++cur, ++beg) {
2976 _page_sizes[cur] = _page_sizes[beg];
2977 }
2978 _page_sizes[end] = vm_page_size();
2979 _page_sizes[end + 1] = 0;
2980
2981 if (_page_sizes[end] > _page_sizes[end - 1]) {
2982 // Default page size is not the smallest; sort again.
2983 insertion_sort_descending(_page_sizes, end + 1);
2984 }
2985 *page_size = _page_sizes[0];
2986
2987 trace_page_sizes("usable page sizes", _page_sizes, end + 1);
2988 return true;
2989 }
2990
2991 void os::large_page_init() {
2992 if (UseLargePages) {
2993 // print a warning if any large page related flag is specified on command line
2994 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) ||
2995 !FLAG_IS_DEFAULT(LargePageSizeInBytes);
2996
2997 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size);
2998 }
2999 }
3000
3001 bool os::Solaris::is_valid_page_size(size_t bytes) {
3002 for (int i = 0; _page_sizes[i] != 0; i++) {
3003 if (_page_sizes[i] == bytes) {
3004 return true;
3005 }
3006 }
3007 return false;
3008 }
3009
3010 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) {
3011 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align);
3012 assert(is_ptr_aligned((void*) start, align),
3013 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align);
3014 assert(is_size_aligned(bytes, align),
3015 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align);
3016
3017 // Signal to OS that we want large pages for addresses
3018 // from addr, addr + bytes
3019 struct memcntl_mha mpss_struct;
3020 mpss_struct.mha_cmd = MHA_MAPSIZE_VA;
3021 mpss_struct.mha_pagesize = align;
3022 mpss_struct.mha_flags = 0;
3023 // Upon successful completion, memcntl() returns 0
3024 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) {
3025 debug_only(warning("Attempt to use MPSS failed."));
3026 return false;
3027 }
3028 return true;
3029 }
3030
3031 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) {
3032 fatal("os::reserve_memory_special should not be called on Solaris.");
3033 return NULL;
3034 }
3035
3036 bool os::release_memory_special(char* base, size_t bytes) {
3037 fatal("os::release_memory_special should not be called on Solaris.");
3038 return false;
3039 }
3040
3041 size_t os::large_page_size() {
3042 return _large_page_size;
3043 }
3044
3045 // MPSS allows application to commit large page memory on demand; with ISM
3046 // the entire memory region must be allocated as shared memory.
3047 bool os::can_commit_large_page_memory() {
3048 return true;
3049 }
3050
3051 bool os::can_execute_large_page_memory() {
3052 return true;
3053 }
3054
3055 // Read calls from inside the vm need to perform state transitions
3056 size_t os::read(int fd, void *buf, unsigned int nBytes) {
3057 size_t res;
3058 JavaThread* thread = (JavaThread*)Thread::current();
3059 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3060 ThreadBlockInVM tbiv(thread);
3061 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3062 return res;
3063 }
3064
3065 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
3066 size_t res;
3067 JavaThread* thread = (JavaThread*)Thread::current();
3068 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm");
3069 ThreadBlockInVM tbiv(thread);
3070 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res);
3071 return res;
3072 }
3073
3074 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) {
3075 size_t res;
3076 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
3077 "Assumed _thread_in_native");
3078 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res);
3079 return res;
3080 }
3081
3082 void os::naked_short_sleep(jlong ms) {
3083 assert(ms < 1000, "Un-interruptable sleep, short time use only");
3084
3085 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but
3086 // Solaris requires -lrt for this.
3087 usleep((ms * 1000));
3088
3089 return;
3090 }
3091
3092 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
3093 void os::infinite_sleep() {
3094 while (true) { // sleep forever ...
3095 ::sleep(100); // ... 100 seconds at a time
3096 }
3097 }
3098
3099 // Used to convert frequent JVM_Yield() to nops
3100 bool os::dont_yield() {
3101 if (DontYieldALot) {
3102 static hrtime_t last_time = 0;
3103 hrtime_t diff = getTimeNanos() - last_time;
3104
3105 if (diff < DontYieldALotInterval * 1000000) {
3106 return true;
3107 }
3108
3109 last_time += diff;
3110
3111 return false;
3112 } else {
3113 return false;
3114 }
3115 }
3116
3117 // Note that yield semantics are defined by the scheduling class to which
3118 // the thread currently belongs. Typically, yield will _not yield to
3119 // other equal or higher priority threads that reside on the dispatch queues
3120 // of other CPUs.
3121
3122 void os::naked_yield() {
3123 thr_yield();
3124 }
3125
3126 // Interface for setting lwp priorities. If we are using T2 libthread,
3127 // which forces the use of BoundThreads or we manually set UseBoundThreads,
3128 // all of our threads will be assigned to real lwp's. Using the thr_setprio
3129 // function is meaningless in this mode so we must adjust the real lwp's priority
3130 // The routines below implement the getting and setting of lwp priorities.
3131 //
3132 // Note: T2 is now the only supported libthread. UseBoundThreads flag is
3133 // being deprecated and all threads are now BoundThreads
3134 //
3135 // Note: There are three priority scales used on Solaris. Java priotities
3136 // which range from 1 to 10, libthread "thr_setprio" scale which range
3137 // from 0 to 127, and the current scheduling class of the process we
3138 // are running in. This is typically from -60 to +60.
3139 // The setting of the lwp priorities in done after a call to thr_setprio
3140 // so Java priorities are mapped to libthread priorities and we map from
3141 // the latter to lwp priorities. We don't keep priorities stored in
3142 // Java priorities since some of our worker threads want to set priorities
3143 // higher than all Java threads.
3144 //
3145 // For related information:
3146 // (1) man -s 2 priocntl
3147 // (2) man -s 4 priocntl
3148 // (3) man dispadmin
3149 // = librt.so
3150 // = libthread/common/rtsched.c - thrp_setlwpprio().
3151 // = ps -cL <pid> ... to validate priority.
3152 // = sched_get_priority_min and _max
3153 // pthread_create
3154 // sched_setparam
3155 // pthread_setschedparam
3156 //
3157 // Assumptions:
3158 // + We assume that all threads in the process belong to the same
3159 // scheduling class. IE. an homogenous process.
3160 // + Must be root or in IA group to change change "interactive" attribute.
3161 // Priocntl() will fail silently. The only indication of failure is when
3162 // we read-back the value and notice that it hasn't changed.
3163 // + Interactive threads enter the runq at the head, non-interactive at the tail.
3164 // + For RT, change timeslice as well. Invariant:
3165 // constant "priority integral"
3166 // Konst == TimeSlice * (60-Priority)
3167 // Given a priority, compute appropriate timeslice.
3168 // + Higher numerical values have higher priority.
3169
3170 // sched class attributes
3171 typedef struct {
3172 int schedPolicy; // classID
3173 int maxPrio;
3174 int minPrio;
3175 } SchedInfo;
3176
3177
3178 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits;
3179
3180 #ifdef ASSERT
3181 static int ReadBackValidate = 1;
3182 #endif
3183 static int myClass = 0;
3184 static int myMin = 0;
3185 static int myMax = 0;
3186 static int myCur = 0;
3187 static bool priocntl_enable = false;
3188
3189 static const int criticalPrio = FXCriticalPriority;
3190 static int java_MaxPriority_to_os_priority = 0; // Saved mapping
3191
3192
3193 // lwp_priocntl_init
3194 //
3195 // Try to determine the priority scale for our process.
3196 //
3197 // Return errno or 0 if OK.
3198 //
3199 static int lwp_priocntl_init() {
3200 int rslt;
3201 pcinfo_t ClassInfo;
3202 pcparms_t ParmInfo;
3203 int i;
3204
3205 if (!UseThreadPriorities) return 0;
3206
3207 // If ThreadPriorityPolicy is 1, switch tables
3208 if (ThreadPriorityPolicy == 1) {
3209 for (i = 0; i < CriticalPriority+1; i++)
3210 os::java_to_os_priority[i] = prio_policy1[i];
3211 }
3212 if (UseCriticalJavaThreadPriority) {
3213 // MaxPriority always maps to the FX scheduling class and criticalPrio.
3214 // See set_native_priority() and set_lwp_class_and_priority().
3215 // Save original MaxPriority mapping in case attempt to
3216 // use critical priority fails.
3217 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority];
3218 // Set negative to distinguish from other priorities
3219 os::java_to_os_priority[MaxPriority] = -criticalPrio;
3220 }
3221
3222 // Get IDs for a set of well-known scheduling classes.
3223 // TODO-FIXME: GETCLINFO returns the current # of classes in the
3224 // the system. We should have a loop that iterates over the
3225 // classID values, which are known to be "small" integers.
3226
3227 strcpy(ClassInfo.pc_clname, "TS");
3228 ClassInfo.pc_cid = -1;
3229 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3230 if (rslt < 0) return errno;
3231 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1");
3232 tsLimits.schedPolicy = ClassInfo.pc_cid;
3233 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri;
3234 tsLimits.minPrio = -tsLimits.maxPrio;
3235
3236 strcpy(ClassInfo.pc_clname, "IA");
3237 ClassInfo.pc_cid = -1;
3238 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3239 if (rslt < 0) return errno;
3240 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1");
3241 iaLimits.schedPolicy = ClassInfo.pc_cid;
3242 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri;
3243 iaLimits.minPrio = -iaLimits.maxPrio;
3244
3245 strcpy(ClassInfo.pc_clname, "RT");
3246 ClassInfo.pc_cid = -1;
3247 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3248 if (rslt < 0) return errno;
3249 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1");
3250 rtLimits.schedPolicy = ClassInfo.pc_cid;
3251 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri;
3252 rtLimits.minPrio = 0;
3253
3254 strcpy(ClassInfo.pc_clname, "FX");
3255 ClassInfo.pc_cid = -1;
3256 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo);
3257 if (rslt < 0) return errno;
3258 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1");
3259 fxLimits.schedPolicy = ClassInfo.pc_cid;
3260 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri;
3261 fxLimits.minPrio = 0;
3262
3263 // Query our "current" scheduling class.
3264 // This will normally be IA, TS or, rarely, FX or RT.
3265 memset(&ParmInfo, 0, sizeof(ParmInfo));
3266 ParmInfo.pc_cid = PC_CLNULL;
3267 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3268 if (rslt < 0) return errno;
3269 myClass = ParmInfo.pc_cid;
3270
3271 // We now know our scheduling classId, get specific information
3272 // about the class.
3273 ClassInfo.pc_cid = myClass;
3274 ClassInfo.pc_clname[0] = 0;
3275 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo);
3276 if (rslt < 0) return errno;
3277
3278 if (ThreadPriorityVerbose) {
3279 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname);
3280 }
3281
3282 memset(&ParmInfo, 0, sizeof(pcparms_t));
3283 ParmInfo.pc_cid = PC_CLNULL;
3284 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo);
3285 if (rslt < 0) return errno;
3286
3287 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3288 myMin = rtLimits.minPrio;
3289 myMax = rtLimits.maxPrio;
3290 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3291 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3292 myMin = iaLimits.minPrio;
3293 myMax = iaLimits.maxPrio;
3294 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict
3295 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3296 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3297 myMin = tsLimits.minPrio;
3298 myMax = tsLimits.maxPrio;
3299 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict
3300 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3301 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3302 myMin = fxLimits.minPrio;
3303 myMax = fxLimits.maxPrio;
3304 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict
3305 } else {
3306 // No clue - punt
3307 if (ThreadPriorityVerbose) {
3308 tty->print_cr("Unknown scheduling class: %s ... \n",
3309 ClassInfo.pc_clname);
3310 }
3311 return EINVAL; // no clue, punt
3312 }
3313
3314 if (ThreadPriorityVerbose) {
3315 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax);
3316 }
3317
3318 priocntl_enable = true; // Enable changing priorities
3319 return 0;
3320 }
3321
3322 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms))
3323 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms))
3324 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms))
3325 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms))
3326
3327
3328 // scale_to_lwp_priority
3329 //
3330 // Convert from the libthread "thr_setprio" scale to our current
3331 // lwp scheduling class scale.
3332 //
3333 static int scale_to_lwp_priority(int rMin, int rMax, int x) {
3334 int v;
3335
3336 if (x == 127) return rMax; // avoid round-down
3337 v = (((x*(rMax-rMin)))/128)+rMin;
3338 return v;
3339 }
3340
3341
3342 // set_lwp_class_and_priority
3343 int set_lwp_class_and_priority(int ThreadID, int lwpid,
3344 int newPrio, int new_class, bool scale) {
3345 int rslt;
3346 int Actual, Expected, prv;
3347 pcparms_t ParmInfo; // for GET-SET
3348 #ifdef ASSERT
3349 pcparms_t ReadBack; // for readback
3350 #endif
3351
3352 // Set priority via PC_GETPARMS, update, PC_SETPARMS
3353 // Query current values.
3354 // TODO: accelerate this by eliminating the PC_GETPARMS call.
3355 // Cache "pcparms_t" in global ParmCache.
3356 // TODO: elide set-to-same-value
3357
3358 // If something went wrong on init, don't change priorities.
3359 if (!priocntl_enable) {
3360 if (ThreadPriorityVerbose) {
3361 tty->print_cr("Trying to set priority but init failed, ignoring");
3362 }
3363 return EINVAL;
3364 }
3365
3366 // If lwp hasn't started yet, just return
3367 // the _start routine will call us again.
3368 if (lwpid <= 0) {
3369 if (ThreadPriorityVerbose) {
3370 tty->print_cr("deferring the set_lwp_class_and_priority of thread "
3371 INTPTR_FORMAT " to %d, lwpid not set",
3372 ThreadID, newPrio);
3373 }
3374 return 0;
3375 }
3376
3377 if (ThreadPriorityVerbose) {
3378 tty->print_cr ("set_lwp_class_and_priority("
3379 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ",
3380 ThreadID, lwpid, newPrio);
3381 }
3382
3383 memset(&ParmInfo, 0, sizeof(pcparms_t));
3384 ParmInfo.pc_cid = PC_CLNULL;
3385 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo);
3386 if (rslt < 0) return errno;
3387
3388 int cur_class = ParmInfo.pc_cid;
3389 ParmInfo.pc_cid = (id_t)new_class;
3390
3391 if (new_class == rtLimits.schedPolicy) {
3392 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms;
3393 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio,
3394 rtLimits.maxPrio, newPrio)
3395 : newPrio;
3396 rtInfo->rt_tqsecs = RT_NOCHANGE;
3397 rtInfo->rt_tqnsecs = RT_NOCHANGE;
3398 if (ThreadPriorityVerbose) {
3399 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri);
3400 }
3401 } else if (new_class == iaLimits.schedPolicy) {
3402 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms;
3403 int maxClamped = MIN2(iaLimits.maxPrio,
3404 cur_class == new_class
3405 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio);
3406 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio,
3407 maxClamped, newPrio)
3408 : newPrio;
3409 iaInfo->ia_uprilim = cur_class == new_class
3410 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio;
3411 iaInfo->ia_mode = IA_NOCHANGE;
3412 if (ThreadPriorityVerbose) {
3413 tty->print_cr("IA: [%d...%d] %d->%d\n",
3414 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri);
3415 }
3416 } else if (new_class == tsLimits.schedPolicy) {
3417 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms;
3418 int maxClamped = MIN2(tsLimits.maxPrio,
3419 cur_class == new_class
3420 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio);
3421 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio,
3422 maxClamped, newPrio)
3423 : newPrio;
3424 tsInfo->ts_uprilim = cur_class == new_class
3425 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio;
3426 if (ThreadPriorityVerbose) {
3427 tty->print_cr("TS: [%d...%d] %d->%d\n",
3428 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri);
3429 }
3430 } else if (new_class == fxLimits.schedPolicy) {
3431 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms;
3432 int maxClamped = MIN2(fxLimits.maxPrio,
3433 cur_class == new_class
3434 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio);
3435 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio,
3436 maxClamped, newPrio)
3437 : newPrio;
3438 fxInfo->fx_uprilim = cur_class == new_class
3439 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio;
3440 fxInfo->fx_tqsecs = FX_NOCHANGE;
3441 fxInfo->fx_tqnsecs = FX_NOCHANGE;
3442 if (ThreadPriorityVerbose) {
3443 tty->print_cr("FX: [%d...%d] %d->%d\n",
3444 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri);
3445 }
3446 } else {
3447 if (ThreadPriorityVerbose) {
3448 tty->print_cr("Unknown new scheduling class %d\n", new_class);
3449 }
3450 return EINVAL; // no clue, punt
3451 }
3452
3453 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo);
3454 if (ThreadPriorityVerbose && rslt) {
3455 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno);
3456 }
3457 if (rslt < 0) return errno;
3458
3459 #ifdef ASSERT
3460 // Sanity check: read back what we just attempted to set.
3461 // In theory it could have changed in the interim ...
3462 //
3463 // The priocntl system call is tricky.
3464 // Sometimes it'll validate the priority value argument and
3465 // return EINVAL if unhappy. At other times it fails silently.
3466 // Readbacks are prudent.
3467
3468 if (!ReadBackValidate) return 0;
3469
3470 memset(&ReadBack, 0, sizeof(pcparms_t));
3471 ReadBack.pc_cid = PC_CLNULL;
3472 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack);
3473 assert(rslt >= 0, "priocntl failed");
3474 Actual = Expected = 0xBAD;
3475 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match");
3476 if (ParmInfo.pc_cid == rtLimits.schedPolicy) {
3477 Actual = RTPRI(ReadBack)->rt_pri;
3478 Expected = RTPRI(ParmInfo)->rt_pri;
3479 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) {
3480 Actual = IAPRI(ReadBack)->ia_upri;
3481 Expected = IAPRI(ParmInfo)->ia_upri;
3482 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) {
3483 Actual = TSPRI(ReadBack)->ts_upri;
3484 Expected = TSPRI(ParmInfo)->ts_upri;
3485 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) {
3486 Actual = FXPRI(ReadBack)->fx_upri;
3487 Expected = FXPRI(ParmInfo)->fx_upri;
3488 } else {
3489 if (ThreadPriorityVerbose) {
3490 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n",
3491 ParmInfo.pc_cid);
3492 }
3493 }
3494
3495 if (Actual != Expected) {
3496 if (ThreadPriorityVerbose) {
3497 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n",
3498 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected);
3499 }
3500 }
3501 #endif
3502
3503 return 0;
3504 }
3505
3506 // Solaris only gives access to 128 real priorities at a time,
3507 // so we expand Java's ten to fill this range. This would be better
3508 // if we dynamically adjusted relative priorities.
3509 //
3510 // The ThreadPriorityPolicy option allows us to select 2 different
3511 // priority scales.
3512 //
3513 // ThreadPriorityPolicy=0
3514 // Since the Solaris' default priority is MaximumPriority, we do not
3515 // set a priority lower than Max unless a priority lower than
3516 // NormPriority is requested.
3517 //
3518 // ThreadPriorityPolicy=1
3519 // This mode causes the priority table to get filled with
3520 // linear values. NormPriority get's mapped to 50% of the
3521 // Maximum priority an so on. This will cause VM threads
3522 // to get unfair treatment against other Solaris processes
3523 // which do not explicitly alter their thread priorities.
3524
3525 int os::java_to_os_priority[CriticalPriority + 1] = {
3526 -99999, // 0 Entry should never be used
3527
3528 0, // 1 MinPriority
3529 32, // 2
3530 64, // 3
3531
3532 96, // 4
3533 127, // 5 NormPriority
3534 127, // 6
3535
3536 127, // 7
3537 127, // 8
3538 127, // 9 NearMaxPriority
3539
3540 127, // 10 MaxPriority
3541
3542 -criticalPrio // 11 CriticalPriority
3543 };
3544
3545 OSReturn os::set_native_priority(Thread* thread, int newpri) {
3546 OSThread* osthread = thread->osthread();
3547
3548 // Save requested priority in case the thread hasn't been started
3549 osthread->set_native_priority(newpri);
3550
3551 // Check for critical priority request
3552 bool fxcritical = false;
3553 if (newpri == -criticalPrio) {
3554 fxcritical = true;
3555 newpri = criticalPrio;
3556 }
3557
3558 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping");
3559 if (!UseThreadPriorities) return OS_OK;
3560
3561 int status = 0;
3562
3563 if (!fxcritical) {
3564 // Use thr_setprio only if we have a priority that thr_setprio understands
3565 status = thr_setprio(thread->osthread()->thread_id(), newpri);
3566 }
3567
3568 int lwp_status =
3569 set_lwp_class_and_priority(osthread->thread_id(),
3570 osthread->lwp_id(),
3571 newpri,
3572 fxcritical ? fxLimits.schedPolicy : myClass,
3573 !fxcritical);
3574 if (lwp_status != 0 && fxcritical) {
3575 // Try again, this time without changing the scheduling class
3576 newpri = java_MaxPriority_to_os_priority;
3577 lwp_status = set_lwp_class_and_priority(osthread->thread_id(),
3578 osthread->lwp_id(),
3579 newpri, myClass, false);
3580 }
3581 status |= lwp_status;
3582 return (status == 0) ? OS_OK : OS_ERR;
3583 }
3584
3585
3586 OSReturn os::get_native_priority(const Thread* const thread,
3587 int *priority_ptr) {
3588 int p;
3589 if (!UseThreadPriorities) {
3590 *priority_ptr = NormalPriority;
3591 return OS_OK;
3592 }
3593 int status = thr_getprio(thread->osthread()->thread_id(), &p);
3594 if (status != 0) {
3595 return OS_ERR;
3596 }
3597 *priority_ptr = p;
3598 return OS_OK;
3599 }
3600
3601
3602 // Hint to the underlying OS that a task switch would not be good.
3603 // Void return because it's a hint and can fail.
3604 void os::hint_no_preempt() {
3605 schedctl_start(schedctl_init());
3606 }
3607
3608 static void resume_clear_context(OSThread *osthread) {
3609 osthread->set_ucontext(NULL);
3610 }
3611
3612 static void suspend_save_context(OSThread *osthread, ucontext_t* context) {
3613 osthread->set_ucontext(context);
3614 }
3615
3616 static PosixSemaphore sr_semaphore;
3617
3618 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) {
3619 // Save and restore errno to avoid confusing native code with EINTR
3620 // after sigsuspend.
3621 int old_errno = errno;
3622
3623 OSThread* osthread = thread->osthread();
3624 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3625
3626 os::SuspendResume::State current = osthread->sr.state();
3627 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3628 suspend_save_context(osthread, uc);
3629
3630 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3631 os::SuspendResume::State state = osthread->sr.suspended();
3632 if (state == os::SuspendResume::SR_SUSPENDED) {
3633 sigset_t suspend_set; // signals for sigsuspend()
3634
3635 // get current set of blocked signals and unblock resume signal
3636 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3637 sigdelset(&suspend_set, os::Solaris::SIGasync());
3638
3639 sr_semaphore.signal();
3640 // wait here until we are resumed
3641 while (1) {
3642 sigsuspend(&suspend_set);
3643
3644 os::SuspendResume::State result = osthread->sr.running();
3645 if (result == os::SuspendResume::SR_RUNNING) {
3646 sr_semaphore.signal();
3647 break;
3648 }
3649 }
3650
3651 } else if (state == os::SuspendResume::SR_RUNNING) {
3652 // request was cancelled, continue
3653 } else {
3654 ShouldNotReachHere();
3655 }
3656
3657 resume_clear_context(osthread);
3658 } else if (current == os::SuspendResume::SR_RUNNING) {
3659 // request was cancelled, continue
3660 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3661 // ignore
3662 } else {
3663 // ignore
3664 }
3665
3666 errno = old_errno;
3667 }
3668
3669 void os::print_statistics() {
3670 }
3671
3672 bool os::message_box(const char* title, const char* message) {
3673 int i;
3674 fdStream err(defaultStream::error_fd());
3675 for (i = 0; i < 78; i++) err.print_raw("=");
3676 err.cr();
3677 err.print_raw_cr(title);
3678 for (i = 0; i < 78; i++) err.print_raw("-");
3679 err.cr();
3680 err.print_raw_cr(message);
3681 for (i = 0; i < 78; i++) err.print_raw("=");
3682 err.cr();
3683
3684 char buf[16];
3685 // Prevent process from exiting upon "read error" without consuming all CPU
3686 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3687
3688 return buf[0] == 'y' || buf[0] == 'Y';
3689 }
3690
3691 static int sr_notify(OSThread* osthread) {
3692 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync());
3693 assert_status(status == 0, status, "thr_kill");
3694 return status;
3695 }
3696
3697 // "Randomly" selected value for how long we want to spin
3698 // before bailing out on suspending a thread, also how often
3699 // we send a signal to a thread we want to resume
3700 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3701 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3702
3703 static bool do_suspend(OSThread* osthread) {
3704 assert(osthread->sr.is_running(), "thread should be running");
3705 assert(!sr_semaphore.trywait(), "semaphore has invalid state");
3706
3707 // mark as suspended and send signal
3708 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3709 // failed to switch, state wasn't running?
3710 ShouldNotReachHere();
3711 return false;
3712 }
3713
3714 if (sr_notify(osthread) != 0) {
3715 ShouldNotReachHere();
3716 }
3717
3718 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3719 while (true) {
3720 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) {
3721 break;
3722 } else {
3723 // timeout
3724 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3725 if (cancelled == os::SuspendResume::SR_RUNNING) {
3726 return false;
3727 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3728 // make sure that we consume the signal on the semaphore as well
3729 sr_semaphore.wait();
3730 break;
3731 } else {
3732 ShouldNotReachHere();
3733 return false;
3734 }
3735 }
3736 }
3737
3738 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3739 return true;
3740 }
3741
3742 static void do_resume(OSThread* osthread) {
3743 assert(osthread->sr.is_suspended(), "thread should be suspended");
3744 assert(!sr_semaphore.trywait(), "invalid semaphore state");
3745
3746 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3747 // failed to switch to WAKEUP_REQUEST
3748 ShouldNotReachHere();
3749 return;
3750 }
3751
3752 while (true) {
3753 if (sr_notify(osthread) == 0) {
3754 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) {
3755 if (osthread->sr.is_running()) {
3756 return;
3757 }
3758 }
3759 } else {
3760 ShouldNotReachHere();
3761 }
3762 }
3763
3764 guarantee(osthread->sr.is_running(), "Must be running!");
3765 }
3766
3767 void os::SuspendedThreadTask::internal_do_task() {
3768 if (do_suspend(_thread->osthread())) {
3769 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3770 do_task(context);
3771 do_resume(_thread->osthread());
3772 }
3773 }
3774
3775 class PcFetcher : public os::SuspendedThreadTask {
3776 public:
3777 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3778 ExtendedPC result();
3779 protected:
3780 void do_task(const os::SuspendedThreadTaskContext& context);
3781 private:
3782 ExtendedPC _epc;
3783 };
3784
3785 ExtendedPC PcFetcher::result() {
3786 guarantee(is_done(), "task is not done yet.");
3787 return _epc;
3788 }
3789
3790 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3791 Thread* thread = context.thread();
3792 OSThread* osthread = thread->osthread();
3793 if (osthread->ucontext() != NULL) {
3794 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext());
3795 } else {
3796 // NULL context is unexpected, double-check this is the VMThread
3797 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3798 }
3799 }
3800
3801 // A lightweight implementation that does not suspend the target thread and
3802 // thus returns only a hint. Used for profiling only!
3803 ExtendedPC os::get_thread_pc(Thread* thread) {
3804 // Make sure that it is called by the watcher and the Threads lock is owned.
3805 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock");
3806 // For now, is only used to profile the VM Thread
3807 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3808 PcFetcher fetcher(thread);
3809 fetcher.run();
3810 return fetcher.result();
3811 }
3812
3813
3814 // This does not do anything on Solaris. This is basically a hook for being
3815 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32.
3816 void os::os_exception_wrapper(java_call_t f, JavaValue* value,
3817 const methodHandle& method, JavaCallArguments* args,
3818 Thread* thread) {
3819 f(value, method, args, thread);
3820 }
3821
3822 // This routine may be used by user applications as a "hook" to catch signals.
3823 // The user-defined signal handler must pass unrecognized signals to this
3824 // routine, and if it returns true (non-zero), then the signal handler must
3825 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3826 // routine will never retun false (zero), but instead will execute a VM panic
3827 // routine kill the process.
3828 //
3829 // If this routine returns false, it is OK to call it again. This allows
3830 // the user-defined signal handler to perform checks either before or after
3831 // the VM performs its own checks. Naturally, the user code would be making
3832 // a serious error if it tried to handle an exception (such as a null check
3833 // or breakpoint) that the VM was generating for its own correct operation.
3834 //
3835 // This routine may recognize any of the following kinds of signals:
3836 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ,
3837 // os::Solaris::SIGasync
3838 // It should be consulted by handlers for any of those signals.
3839 //
3840 // The caller of this routine must pass in the three arguments supplied
3841 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3842 // field of the structure passed to sigaction(). This routine assumes that
3843 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3844 //
3845 // Note that the VM will print warnings if it detects conflicting signal
3846 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3847 //
3848 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo,
3849 siginfo_t* siginfo,
3850 void* ucontext,
3851 int abort_if_unrecognized);
3852
3853
3854 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {
3855 int orig_errno = errno; // Preserve errno value over signal handler.
3856 JVM_handle_solaris_signal(sig, info, ucVoid, true);
3857 errno = orig_errno;
3858 }
3859
3860 // This boolean allows users to forward their own non-matching signals
3861 // to JVM_handle_solaris_signal, harmlessly.
3862 bool os::Solaris::signal_handlers_are_installed = false;
3863
3864 // For signal-chaining
3865 bool os::Solaris::libjsig_is_loaded = false;
3866 typedef struct sigaction *(*get_signal_t)(int);
3867 get_signal_t os::Solaris::get_signal_action = NULL;
3868
3869 struct sigaction* os::Solaris::get_chained_signal_action(int sig) {
3870 struct sigaction *actp = NULL;
3871
3872 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) {
3873 // Retrieve the old signal handler from libjsig
3874 actp = (*get_signal_action)(sig);
3875 }
3876 if (actp == NULL) {
3877 // Retrieve the preinstalled signal handler from jvm
3878 actp = get_preinstalled_handler(sig);
3879 }
3880
3881 return actp;
3882 }
3883
3884 static bool call_chained_handler(struct sigaction *actp, int sig,
3885 siginfo_t *siginfo, void *context) {
3886 // Call the old signal handler
3887 if (actp->sa_handler == SIG_DFL) {
3888 // It's more reasonable to let jvm treat it as an unexpected exception
3889 // instead of taking the default action.
3890 return false;
3891 } else if (actp->sa_handler != SIG_IGN) {
3892 if ((actp->sa_flags & SA_NODEFER) == 0) {
3893 // automaticlly block the signal
3894 sigaddset(&(actp->sa_mask), sig);
3895 }
3896
3897 sa_handler_t hand;
3898 sa_sigaction_t sa;
3899 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3900 // retrieve the chained handler
3901 if (siginfo_flag_set) {
3902 sa = actp->sa_sigaction;
3903 } else {
3904 hand = actp->sa_handler;
3905 }
3906
3907 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3908 actp->sa_handler = SIG_DFL;
3909 }
3910
3911 // try to honor the signal mask
3912 sigset_t oset;
3913 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3914
3915 // call into the chained handler
3916 if (siginfo_flag_set) {
3917 (*sa)(sig, siginfo, context);
3918 } else {
3919 (*hand)(sig);
3920 }
3921
3922 // restore the signal mask
3923 pthread_sigmask(SIG_SETMASK, &oset, 0);
3924 }
3925 // Tell jvm's signal handler the signal is taken care of.
3926 return true;
3927 }
3928
3929 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3930 bool chained = false;
3931 // signal-chaining
3932 if (UseSignalChaining) {
3933 struct sigaction *actp = get_chained_signal_action(sig);
3934 if (actp != NULL) {
3935 chained = call_chained_handler(actp, sig, siginfo, context);
3936 }
3937 }
3938 return chained;
3939 }
3940
3941 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) {
3942 assert((chainedsigactions != (struct sigaction *)NULL) &&
3943 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3944 if (preinstalled_sigs[sig] != 0) {
3945 return &chainedsigactions[sig];
3946 }
3947 return NULL;
3948 }
3949
3950 void os::Solaris::save_preinstalled_handler(int sig,
3951 struct sigaction& oldAct) {
3952 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range");
3953 assert((chainedsigactions != (struct sigaction *)NULL) &&
3954 (preinstalled_sigs != (int *)NULL), "signals not yet initialized");
3955 chainedsigactions[sig] = oldAct;
3956 preinstalled_sigs[sig] = 1;
3957 }
3958
3959 void os::Solaris::set_signal_handler(int sig, bool set_installed,
3960 bool oktochain) {
3961 // Check for overwrite.
3962 struct sigaction oldAct;
3963 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3964 void* oldhand =
3965 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3966 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3967 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3968 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3969 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) {
3970 if (AllowUserSignalHandlers || !set_installed) {
3971 // Do not overwrite; user takes responsibility to forward to us.
3972 return;
3973 } else if (UseSignalChaining) {
3974 if (oktochain) {
3975 // save the old handler in jvm
3976 save_preinstalled_handler(sig, oldAct);
3977 } else {
3978 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal.");
3979 }
3980 // libjsig also interposes the sigaction() call below and saves the
3981 // old sigaction on it own.
3982 } else {
3983 fatal("Encountered unexpected pre-existing sigaction handler "
3984 "%#lx for signal %d.", (long)oldhand, sig);
3985 }
3986 }
3987
3988 struct sigaction sigAct;
3989 sigfillset(&(sigAct.sa_mask));
3990 sigAct.sa_handler = SIG_DFL;
3991
3992 sigAct.sa_sigaction = signalHandler;
3993 // Handle SIGSEGV on alternate signal stack if
3994 // not using stack banging
3995 if (!UseStackBanging && sig == SIGSEGV) {
3996 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
3997 } else {
3998 sigAct.sa_flags = SA_SIGINFO | SA_RESTART;
3999 }
4000 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags);
4001
4002 sigaction(sig, &sigAct, &oldAct);
4003
4004 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
4005 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
4006 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
4007 }
4008
4009
4010 #define DO_SIGNAL_CHECK(sig) \
4011 do { \
4012 if (!sigismember(&check_signal_done, sig)) { \
4013 os::Solaris::check_signal_handler(sig); \
4014 } \
4015 } while (0)
4016
4017 // This method is a periodic task to check for misbehaving JNI applications
4018 // under CheckJNI, we can add any periodic checks here
4019
4020 void os::run_periodic_checks() {
4021 // A big source of grief is hijacking virt. addr 0x0 on Solaris,
4022 // thereby preventing a NULL checks.
4023 if (!check_addr0_done) check_addr0_done = check_addr0(tty);
4024
4025 if (check_signals == false) return;
4026
4027 // SEGV and BUS if overridden could potentially prevent
4028 // generation of hs*.log in the event of a crash, debugging
4029 // such a case can be very challenging, so we absolutely
4030 // check for the following for a good measure:
4031 DO_SIGNAL_CHECK(SIGSEGV);
4032 DO_SIGNAL_CHECK(SIGILL);
4033 DO_SIGNAL_CHECK(SIGFPE);
4034 DO_SIGNAL_CHECK(SIGBUS);
4035 DO_SIGNAL_CHECK(SIGPIPE);
4036 DO_SIGNAL_CHECK(SIGXFSZ);
4037
4038 // ReduceSignalUsage allows the user to override these handlers
4039 // see comments at the very top and jvm_solaris.h
4040 if (!ReduceSignalUsage) {
4041 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
4042 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
4043 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
4044 DO_SIGNAL_CHECK(BREAK_SIGNAL);
4045 }
4046
4047 // See comments above for using JVM1/JVM2
4048 DO_SIGNAL_CHECK(os::Solaris::SIGasync());
4049
4050 }
4051
4052 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
4053
4054 static os_sigaction_t os_sigaction = NULL;
4055
4056 void os::Solaris::check_signal_handler(int sig) {
4057 char buf[O_BUFLEN];
4058 address jvmHandler = NULL;
4059
4060 struct sigaction act;
4061 if (os_sigaction == NULL) {
4062 // only trust the default sigaction, in case it has been interposed
4063 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
4064 if (os_sigaction == NULL) return;
4065 }
4066
4067 os_sigaction(sig, (struct sigaction*)NULL, &act);
4068
4069 address thisHandler = (act.sa_flags & SA_SIGINFO)
4070 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
4071 : CAST_FROM_FN_PTR(address, act.sa_handler);
4072
4073
4074 switch (sig) {
4075 case SIGSEGV:
4076 case SIGBUS:
4077 case SIGFPE:
4078 case SIGPIPE:
4079 case SIGXFSZ:
4080 case SIGILL:
4081 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4082 break;
4083
4084 case SHUTDOWN1_SIGNAL:
4085 case SHUTDOWN2_SIGNAL:
4086 case SHUTDOWN3_SIGNAL:
4087 case BREAK_SIGNAL:
4088 jvmHandler = (address)user_handler();
4089 break;
4090
4091 default:
4092 int asynsig = os::Solaris::SIGasync();
4093
4094 if (sig == asynsig) {
4095 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler);
4096 } else {
4097 return;
4098 }
4099 break;
4100 }
4101
4102
4103 if (thisHandler != jvmHandler) {
4104 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
4105 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
4106 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
4107 // No need to check this sig any longer
4108 sigaddset(&check_signal_done, sig);
4109 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
4110 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
4111 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
4112 exception_name(sig, buf, O_BUFLEN));
4113 }
4114 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) {
4115 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
4116 tty->print("expected:");
4117 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig));
4118 tty->cr();
4119 tty->print(" found:");
4120 os::Posix::print_sa_flags(tty, act.sa_flags);
4121 tty->cr();
4122 // No need to check this sig any longer
4123 sigaddset(&check_signal_done, sig);
4124 }
4125
4126 // Print all the signal handler state
4127 if (sigismember(&check_signal_done, sig)) {
4128 print_signal_handlers(tty, buf, O_BUFLEN);
4129 }
4130
4131 }
4132
4133 void os::Solaris::install_signal_handlers() {
4134 bool libjsigdone = false;
4135 signal_handlers_are_installed = true;
4136
4137 // signal-chaining
4138 typedef void (*signal_setting_t)();
4139 signal_setting_t begin_signal_setting = NULL;
4140 signal_setting_t end_signal_setting = NULL;
4141 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4142 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
4143 if (begin_signal_setting != NULL) {
4144 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
4145 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
4146 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
4147 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
4148 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t,
4149 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version"));
4150 libjsig_is_loaded = true;
4151 if (os::Solaris::get_libjsig_version != NULL) {
4152 libjsigversion = (*os::Solaris::get_libjsig_version)();
4153 }
4154 assert(UseSignalChaining, "should enable signal-chaining");
4155 }
4156 if (libjsig_is_loaded) {
4157 // Tell libjsig jvm is setting signal handlers
4158 (*begin_signal_setting)();
4159 }
4160
4161 set_signal_handler(SIGSEGV, true, true);
4162 set_signal_handler(SIGPIPE, true, true);
4163 set_signal_handler(SIGXFSZ, true, true);
4164 set_signal_handler(SIGBUS, true, true);
4165 set_signal_handler(SIGILL, true, true);
4166 set_signal_handler(SIGFPE, true, true);
4167
4168
4169 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) {
4170 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so
4171 // can not register overridable signals which might be > 32
4172 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) {
4173 // Tell libjsig jvm has finished setting signal handlers
4174 (*end_signal_setting)();
4175 libjsigdone = true;
4176 }
4177 }
4178
4179 set_signal_handler(os::Solaris::SIGasync(), true, true);
4180
4181 if (libjsig_is_loaded && !libjsigdone) {
4182 // Tell libjsig jvm finishes setting signal handlers
4183 (*end_signal_setting)();
4184 }
4185
4186 // We don't activate signal checker if libjsig is in place, we trust ourselves
4187 // and if UserSignalHandler is installed all bets are off.
4188 // Log that signal checking is off only if -verbose:jni is specified.
4189 if (CheckJNICalls) {
4190 if (libjsig_is_loaded) {
4191 if (PrintJNIResolving) {
4192 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
4193 }
4194 check_signals = false;
4195 }
4196 if (AllowUserSignalHandlers) {
4197 if (PrintJNIResolving) {
4198 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
4199 }
4200 check_signals = false;
4201 }
4202 }
4203 }
4204
4205
4206 void report_error(const char* file_name, int line_no, const char* title,
4207 const char* format, ...);
4208
4209 // (Static) wrapper for getisax(2) call.
4210 os::Solaris::getisax_func_t os::Solaris::_getisax = 0;
4211
4212 // (Static) wrappers for the liblgrp API
4213 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home;
4214 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init;
4215 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini;
4216 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root;
4217 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children;
4218 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources;
4219 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps;
4220 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale;
4221 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0;
4222
4223 // (Static) wrapper for meminfo() call.
4224 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0;
4225
4226 static address resolve_symbol_lazy(const char* name) {
4227 address addr = (address) dlsym(RTLD_DEFAULT, name);
4228 if (addr == NULL) {
4229 // RTLD_DEFAULT was not defined on some early versions of 2.5.1
4230 addr = (address) dlsym(RTLD_NEXT, name);
4231 }
4232 return addr;
4233 }
4234
4235 static address resolve_symbol(const char* name) {
4236 address addr = resolve_symbol_lazy(name);
4237 if (addr == NULL) {
4238 fatal(dlerror());
4239 }
4240 return addr;
4241 }
4242
4243 void os::Solaris::libthread_init() {
4244 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators");
4245
4246 lwp_priocntl_init();
4247
4248 // RTLD_DEFAULT was not defined on some early versions of 5.5.1
4249 if (func == NULL) {
4250 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators");
4251 // Guarantee that this VM is running on an new enough OS (5.6 or
4252 // later) that it will have a new enough libthread.so.
4253 guarantee(func != NULL, "libthread.so is too old.");
4254 }
4255
4256 int size;
4257 void (*handler_info_func)(address *, int *);
4258 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo"));
4259 handler_info_func(&handler_start, &size);
4260 handler_end = handler_start + size;
4261 }
4262
4263
4264 int_fnP_mutex_tP os::Solaris::_mutex_lock;
4265 int_fnP_mutex_tP os::Solaris::_mutex_trylock;
4266 int_fnP_mutex_tP os::Solaris::_mutex_unlock;
4267 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init;
4268 int_fnP_mutex_tP os::Solaris::_mutex_destroy;
4269 int os::Solaris::_mutex_scope = USYNC_THREAD;
4270
4271 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait;
4272 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait;
4273 int_fnP_cond_tP os::Solaris::_cond_signal;
4274 int_fnP_cond_tP os::Solaris::_cond_broadcast;
4275 int_fnP_cond_tP_i_vP os::Solaris::_cond_init;
4276 int_fnP_cond_tP os::Solaris::_cond_destroy;
4277 int os::Solaris::_cond_scope = USYNC_THREAD;
4278
4279 void os::Solaris::synchronization_init() {
4280 if (UseLWPSynchronization) {
4281 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock")));
4282 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock")));
4283 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock")));
4284 os::Solaris::set_mutex_init(lwp_mutex_init);
4285 os::Solaris::set_mutex_destroy(lwp_mutex_destroy);
4286 os::Solaris::set_mutex_scope(USYNC_THREAD);
4287
4288 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait")));
4289 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait")));
4290 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal")));
4291 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast")));
4292 os::Solaris::set_cond_init(lwp_cond_init);
4293 os::Solaris::set_cond_destroy(lwp_cond_destroy);
4294 os::Solaris::set_cond_scope(USYNC_THREAD);
4295 } else {
4296 os::Solaris::set_mutex_scope(USYNC_THREAD);
4297 os::Solaris::set_cond_scope(USYNC_THREAD);
4298
4299 if (UsePthreads) {
4300 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock")));
4301 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock")));
4302 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock")));
4303 os::Solaris::set_mutex_init(pthread_mutex_default_init);
4304 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy")));
4305
4306 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait")));
4307 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait")));
4308 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal")));
4309 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast")));
4310 os::Solaris::set_cond_init(pthread_cond_default_init);
4311 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy")));
4312 } else {
4313 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock")));
4314 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock")));
4315 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock")));
4316 os::Solaris::set_mutex_init(::mutex_init);
4317 os::Solaris::set_mutex_destroy(::mutex_destroy);
4318
4319 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait")));
4320 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait")));
4321 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal")));
4322 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast")));
4323 os::Solaris::set_cond_init(::cond_init);
4324 os::Solaris::set_cond_destroy(::cond_destroy);
4325 }
4326 }
4327 }
4328
4329 bool os::Solaris::liblgrp_init() {
4330 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY);
4331 if (handle != NULL) {
4332 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home")));
4333 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init")));
4334 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini")));
4335 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root")));
4336 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children")));
4337 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources")));
4338 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps")));
4339 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t,
4340 dlsym(handle, "lgrp_cookie_stale")));
4341
4342 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER);
4343 set_lgrp_cookie(c);
4344 return true;
4345 }
4346 return false;
4347 }
4348
4349 void os::Solaris::misc_sym_init() {
4350 address func;
4351
4352 // getisax
4353 func = resolve_symbol_lazy("getisax");
4354 if (func != NULL) {
4355 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func);
4356 }
4357
4358 // meminfo
4359 func = resolve_symbol_lazy("meminfo");
4360 if (func != NULL) {
4361 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func));
4362 }
4363 }
4364
4365 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) {
4366 assert(_getisax != NULL, "_getisax not set");
4367 return _getisax(array, n);
4368 }
4369
4370 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem);
4371 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem);
4372 static pset_getloadavg_type pset_getloadavg_ptr = NULL;
4373
4374 void init_pset_getloadavg_ptr(void) {
4375 pset_getloadavg_ptr =
4376 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg");
4377 if (pset_getloadavg_ptr == NULL) {
4378 log_warning(os)("pset_getloadavg function not found");
4379 }
4380 }
4381
4382 int os::Solaris::_dev_zero_fd = -1;
4383
4384 // this is called _before_ the global arguments have been parsed
4385 void os::init(void) {
4386 _initial_pid = getpid();
4387
4388 max_hrtime = first_hrtime = gethrtime();
4389
4390 init_random(1234567);
4391
4392 page_size = sysconf(_SC_PAGESIZE);
4393 if (page_size == -1) {
4394 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno));
4395 }
4396 init_page_sizes((size_t) page_size);
4397
4398 Solaris::initialize_system_info();
4399
4400 // Initialize misc. symbols as soon as possible, so we can use them
4401 // if we need them.
4402 Solaris::misc_sym_init();
4403
4404 int fd = ::open("/dev/zero", O_RDWR);
4405 if (fd < 0) {
4406 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno));
4407 } else {
4408 Solaris::set_dev_zero_fd(fd);
4409
4410 // Close on exec, child won't inherit.
4411 fcntl(fd, F_SETFD, FD_CLOEXEC);
4412 }
4413
4414 clock_tics_per_sec = CLK_TCK;
4415
4416 // check if dladdr1() exists; dladdr1 can provide more information than
4417 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9
4418 // and is available on linker patches for 5.7 and 5.8.
4419 // libdl.so must have been loaded, this call is just an entry lookup
4420 void * hdl = dlopen("libdl.so", RTLD_NOW);
4421 if (hdl) {
4422 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1"));
4423 }
4424
4425 // (Solaris only) this switches to calls that actually do locking.
4426 ThreadCritical::initialize();
4427
4428 main_thread = thr_self();
4429
4430 // Constant minimum stack size allowed. It must be at least
4431 // the minimum of what the OS supports (thr_min_stack()), and
4432 // enough to allow the thread to get to user bytecode execution.
4433 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed);
4434
4435 // retrieve entry point for pthread_setname_np
4436 void * handle = dlopen("libc.so.1", RTLD_LAZY);
4437 if (handle != NULL) {
4438 Solaris::_pthread_setname_np =
4439 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np");
4440 }
4441 }
4442
4443 // To install functions for atexit system call
4444 extern "C" {
4445 static void perfMemory_exit_helper() {
4446 perfMemory_exit();
4447 }
4448 }
4449
4450 // this is called _after_ the global arguments have been parsed
4451 jint os::init_2(void) {
4452 // try to enable extended file IO ASAP, see 6431278
4453 os::Solaris::try_enable_extended_io();
4454
4455 // Allocate a single page and mark it as readable for safepoint polling. Also
4456 // use this first mmap call to check support for MAP_ALIGN.
4457 address polling_page = (address)Solaris::mmap_chunk((char*)page_size,
4458 page_size,
4459 MAP_PRIVATE | MAP_ALIGN,
4460 PROT_READ);
4461 if (polling_page == NULL) {
4462 has_map_align = false;
4463 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE,
4464 PROT_READ);
4465 }
4466
4467 os::set_polling_page(polling_page);
4468 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
4469
4470 if (!UseMembar) {
4471 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE);
4472 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
4473 os::set_memory_serialize_page(mem_serialize_page);
4474 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page));
4475 }
4476
4477 // Check minimum allowable stack size for thread creation and to initialize
4478 // the java system classes, including StackOverflowError - depends on page
4479 // size. Add a page for compiler2 recursion in main thread.
4480 // Add in 2*BytesPerWord times page size to account for VM stack during
4481 // class initialization depending on 32 or 64 bit VM.
4482 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed,
4483 JavaThread::stack_guard_zone_size() +
4484 JavaThread::stack_shadow_zone_size() +
4485 (2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size);
4486
4487 size_t threadStackSizeInBytes = ThreadStackSize * K;
4488 if (threadStackSizeInBytes != 0 &&
4489 threadStackSizeInBytes < os::Solaris::min_stack_allowed) {
4490 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk",
4491 os::Solaris::min_stack_allowed/K);
4492 return JNI_ERR;
4493 }
4494
4495 // For 64kbps there will be a 64kb page size, which makes
4496 // the usable default stack size quite a bit less. Increase the
4497 // stack for 64kb (or any > than 8kb) pages, this increases
4498 // virtual memory fragmentation (since we're not creating the
4499 // stack on a power of 2 boundary. The real fix for this
4500 // should be to fix the guard page mechanism.
4501
4502 if (vm_page_size() > 8*K) {
4503 threadStackSizeInBytes = (threadStackSizeInBytes != 0)
4504 ? threadStackSizeInBytes +
4505 JavaThread::stack_red_zone_size() +
4506 JavaThread::stack_yellow_zone_size()
4507 : 0;
4508 ThreadStackSize = threadStackSizeInBytes/K;
4509 }
4510
4511 // Make the stack size a multiple of the page size so that
4512 // the yellow/red zones can be guarded.
4513 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes,
4514 vm_page_size()));
4515
4516 Solaris::libthread_init();
4517
4518 if (UseNUMA) {
4519 if (!Solaris::liblgrp_init()) {
4520 UseNUMA = false;
4521 } else {
4522 size_t lgrp_limit = os::numa_get_groups_num();
4523 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal);
4524 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit);
4525 FREE_C_HEAP_ARRAY(int, lgrp_ids);
4526 if (lgrp_num < 2) {
4527 // There's only one locality group, disable NUMA.
4528 UseNUMA = false;
4529 }
4530 }
4531 if (!UseNUMA && ForceNUMA) {
4532 UseNUMA = true;
4533 }
4534 }
4535
4536 Solaris::signal_sets_init();
4537 Solaris::init_signal_mem();
4538 Solaris::install_signal_handlers();
4539
4540 if (libjsigversion < JSIG_VERSION_1_4_1) {
4541 Maxlibjsigsigs = OLDMAXSIGNUM;
4542 }
4543
4544 // initialize synchronization primitives to use either thread or
4545 // lwp synchronization (controlled by UseLWPSynchronization)
4546 Solaris::synchronization_init();
4547
4548 if (MaxFDLimit) {
4549 // set the number of file descriptors to max. print out error
4550 // if getrlimit/setrlimit fails but continue regardless.
4551 struct rlimit nbr_files;
4552 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
4553 if (status != 0) {
4554 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
4555 } else {
4556 nbr_files.rlim_cur = nbr_files.rlim_max;
4557 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
4558 if (status != 0) {
4559 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
4560 }
4561 }
4562 }
4563
4564 // Calculate theoretical max. size of Threads to guard gainst
4565 // artifical out-of-memory situations, where all available address-
4566 // space has been reserved by thread stacks. Default stack size is 1Mb.
4567 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ?
4568 JavaThread::stack_size_at_create() : (1*K*K);
4569 assert(pre_thread_stack_size != 0, "Must have a stack");
4570 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when
4571 // we should start doing Virtual Memory banging. Currently when the threads will
4572 // have used all but 200Mb of space.
4573 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K);
4574 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size;
4575
4576 // at-exit methods are called in the reverse order of their registration.
4577 // In Solaris 7 and earlier, atexit functions are called on return from
4578 // main or as a result of a call to exit(3C). There can be only 32 of
4579 // these functions registered and atexit() does not set errno. In Solaris
4580 // 8 and later, there is no limit to the number of functions registered
4581 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit
4582 // functions are called upon dlclose(3DL) in addition to return from main
4583 // and exit(3C).
4584
4585 if (PerfAllowAtExitRegistration) {
4586 // only register atexit functions if PerfAllowAtExitRegistration is set.
4587 // atexit functions can be delayed until process exit time, which
4588 // can be problematic for embedded VM situations. Embedded VMs should
4589 // call DestroyJavaVM() to assure that VM resources are released.
4590
4591 // note: perfMemory_exit_helper atexit function may be removed in
4592 // the future if the appropriate cleanup code can be added to the
4593 // VM_Exit VMOperation's doit method.
4594 if (atexit(perfMemory_exit_helper) != 0) {
4595 warning("os::init2 atexit(perfMemory_exit_helper) failed");
4596 }
4597 }
4598
4599 // Init pset_loadavg function pointer
4600 init_pset_getloadavg_ptr();
4601
4602 return JNI_OK;
4603 }
4604
4605 // Mark the polling page as unreadable
4606 void os::make_polling_page_unreadable(void) {
4607 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) {
4608 fatal("Could not disable polling page");
4609 }
4610 }
4611
4612 // Mark the polling page as readable
4613 void os::make_polling_page_readable(void) {
4614 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) {
4615 fatal("Could not enable polling page");
4616 }
4617 }
4618
4619 // OS interface.
4620
4621 bool os::check_heap(bool force) { return true; }
4622
4623 // Is a (classpath) directory empty?
4624 bool os::dir_is_empty(const char* path) {
4625 DIR *dir = NULL;
4626 struct dirent *ptr;
4627
4628 dir = opendir(path);
4629 if (dir == NULL) return true;
4630
4631 // Scan the directory
4632 bool result = true;
4633 char buf[sizeof(struct dirent) + MAX_PATH];
4634 struct dirent *dbuf = (struct dirent *) buf;
4635 while (result && (ptr = readdir(dir, dbuf)) != NULL) {
4636 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4637 result = false;
4638 }
4639 }
4640 closedir(dir);
4641 return result;
4642 }
4643
4644 // This code originates from JDK's sysOpen and open64_w
4645 // from src/solaris/hpi/src/system_md.c
4646
4647 int os::open(const char *path, int oflag, int mode) {
4648 if (strlen(path) > MAX_PATH - 1) {
4649 errno = ENAMETOOLONG;
4650 return -1;
4651 }
4652 int fd;
4653
4654 fd = ::open64(path, oflag, mode);
4655 if (fd == -1) return -1;
4656
4657 // If the open succeeded, the file might still be a directory
4658 {
4659 struct stat64 buf64;
4660 int ret = ::fstat64(fd, &buf64);
4661 int st_mode = buf64.st_mode;
4662
4663 if (ret != -1) {
4664 if ((st_mode & S_IFMT) == S_IFDIR) {
4665 errno = EISDIR;
4666 ::close(fd);
4667 return -1;
4668 }
4669 } else {
4670 ::close(fd);
4671 return -1;
4672 }
4673 }
4674
4675 // 32-bit Solaris systems suffer from:
4676 //
4677 // - an historical default soft limit of 256 per-process file
4678 // descriptors that is too low for many Java programs.
4679 //
4680 // - a design flaw where file descriptors created using stdio
4681 // fopen must be less than 256, _even_ when the first limit above
4682 // has been raised. This can cause calls to fopen (but not calls to
4683 // open, for example) to fail mysteriously, perhaps in 3rd party
4684 // native code (although the JDK itself uses fopen). One can hardly
4685 // criticize them for using this most standard of all functions.
4686 //
4687 // We attempt to make everything work anyways by:
4688 //
4689 // - raising the soft limit on per-process file descriptors beyond
4690 // 256
4691 //
4692 // - As of Solaris 10u4, we can request that Solaris raise the 256
4693 // stdio fopen limit by calling function enable_extended_FILE_stdio.
4694 // This is done in init_2 and recorded in enabled_extended_FILE_stdio
4695 //
4696 // - If we are stuck on an old (pre 10u4) Solaris system, we can
4697 // workaround the bug by remapping non-stdio file descriptors below
4698 // 256 to ones beyond 256, which is done below.
4699 //
4700 // See:
4701 // 1085341: 32-bit stdio routines should support file descriptors >255
4702 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files
4703 // 6431278: Netbeans crash on 32 bit Solaris: need to call
4704 // enable_extended_FILE_stdio() in VM initialisation
4705 // Giri Mandalika's blog
4706 // http://technopark02.blogspot.com/2005_05_01_archive.html
4707 //
4708 #ifndef _LP64
4709 if ((!enabled_extended_FILE_stdio) && fd < 256) {
4710 int newfd = ::fcntl(fd, F_DUPFD, 256);
4711 if (newfd != -1) {
4712 ::close(fd);
4713 fd = newfd;
4714 }
4715 }
4716 #endif // 32-bit Solaris
4717
4718 // All file descriptors that are opened in the JVM and not
4719 // specifically destined for a subprocess should have the
4720 // close-on-exec flag set. If we don't set it, then careless 3rd
4721 // party native code might fork and exec without closing all
4722 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4723 // UNIXProcess.c), and this in turn might:
4724 //
4725 // - cause end-of-file to fail to be detected on some file
4726 // descriptors, resulting in mysterious hangs, or
4727 //
4728 // - might cause an fopen in the subprocess to fail on a system
4729 // suffering from bug 1085341.
4730 //
4731 // (Yes, the default setting of the close-on-exec flag is a Unix
4732 // design flaw)
4733 //
4734 // See:
4735 // 1085341: 32-bit stdio routines should support file descriptors >255
4736 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4737 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4738 //
4739 #ifdef FD_CLOEXEC
4740 {
4741 int flags = ::fcntl(fd, F_GETFD);
4742 if (flags != -1) {
4743 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4744 }
4745 }
4746 #endif
4747
4748 return fd;
4749 }
4750
4751 // create binary file, rewriting existing file if required
4752 int os::create_binary_file(const char* path, bool rewrite_existing) {
4753 int oflags = O_WRONLY | O_CREAT;
4754 if (!rewrite_existing) {
4755 oflags |= O_EXCL;
4756 }
4757 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4758 }
4759
4760 // return current position of file pointer
4761 jlong os::current_file_offset(int fd) {
4762 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4763 }
4764
4765 // move file pointer to the specified offset
4766 jlong os::seek_to_file_offset(int fd, jlong offset) {
4767 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4768 }
4769
4770 jlong os::lseek(int fd, jlong offset, int whence) {
4771 return (jlong) ::lseek64(fd, offset, whence);
4772 }
4773
4774 char * os::native_path(char *path) {
4775 return path;
4776 }
4777
4778 int os::ftruncate(int fd, jlong length) {
4779 return ::ftruncate64(fd, length);
4780 }
4781
4782 int os::fsync(int fd) {
4783 RESTARTABLE_RETURN_INT(::fsync(fd));
4784 }
4785
4786 int os::available(int fd, jlong *bytes) {
4787 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
4788 "Assumed _thread_in_native");
4789 jlong cur, end;
4790 int mode;
4791 struct stat64 buf64;
4792
4793 if (::fstat64(fd, &buf64) >= 0) {
4794 mode = buf64.st_mode;
4795 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4796 int n,ioctl_return;
4797
4798 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return);
4799 if (ioctl_return>= 0) {
4800 *bytes = n;
4801 return 1;
4802 }
4803 }
4804 }
4805 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4806 return 0;
4807 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4808 return 0;
4809 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4810 return 0;
4811 }
4812 *bytes = end - cur;
4813 return 1;
4814 }
4815
4816 // Map a block of memory.
4817 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4818 char *addr, size_t bytes, bool read_only,
4819 bool allow_exec) {
4820 int prot;
4821 int flags;
4822
4823 if (read_only) {
4824 prot = PROT_READ;
4825 flags = MAP_SHARED;
4826 } else {
4827 prot = PROT_READ | PROT_WRITE;
4828 flags = MAP_PRIVATE;
4829 }
4830
4831 if (allow_exec) {
4832 prot |= PROT_EXEC;
4833 }
4834
4835 if (addr != NULL) {
4836 flags |= MAP_FIXED;
4837 }
4838
4839 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4840 fd, file_offset);
4841 if (mapped_address == MAP_FAILED) {
4842 return NULL;
4843 }
4844 return mapped_address;
4845 }
4846
4847
4848 // Remap a block of memory.
4849 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4850 char *addr, size_t bytes, bool read_only,
4851 bool allow_exec) {
4852 // same as map_memory() on this OS
4853 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4854 allow_exec);
4855 }
4856
4857
4858 // Unmap a block of memory.
4859 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4860 return munmap(addr, bytes) == 0;
4861 }
4862
4863 void os::pause() {
4864 char filename[MAX_PATH];
4865 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4866 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4867 } else {
4868 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4869 }
4870
4871 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4872 if (fd != -1) {
4873 struct stat buf;
4874 ::close(fd);
4875 while (::stat(filename, &buf) == 0) {
4876 (void)::poll(NULL, 0, 100);
4877 }
4878 } else {
4879 jio_fprintf(stderr,
4880 "Could not open pause file '%s', continuing immediately.\n", filename);
4881 }
4882 }
4883
4884 #ifndef PRODUCT
4885 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
4886 // Turn this on if you need to trace synch operations.
4887 // Set RECORD_SYNCH_LIMIT to a large-enough value,
4888 // and call record_synch_enable and record_synch_disable
4889 // around the computation of interest.
4890
4891 void record_synch(char* name, bool returning); // defined below
4892
4893 class RecordSynch {
4894 char* _name;
4895 public:
4896 RecordSynch(char* name) :_name(name) { record_synch(_name, false); }
4897 ~RecordSynch() { record_synch(_name, true); }
4898 };
4899
4900 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \
4901 extern "C" ret name params { \
4902 typedef ret name##_t params; \
4903 static name##_t* implem = NULL; \
4904 static int callcount = 0; \
4905 if (implem == NULL) { \
4906 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \
4907 if (implem == NULL) fatal(dlerror()); \
4908 } \
4909 ++callcount; \
4910 RecordSynch _rs(#name); \
4911 inner; \
4912 return implem args; \
4913 }
4914 // in dbx, examine callcounts this way:
4915 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done
4916
4917 #define CHECK_POINTER_OK(p) \
4918 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p)))
4919 #define CHECK_MU \
4920 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only.");
4921 #define CHECK_CV \
4922 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only.");
4923 #define CHECK_P(p) \
4924 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only.");
4925
4926 #define CHECK_MUTEX(mutex_op) \
4927 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU);
4928
4929 CHECK_MUTEX( mutex_lock)
4930 CHECK_MUTEX( _mutex_lock)
4931 CHECK_MUTEX( mutex_unlock)
4932 CHECK_MUTEX(_mutex_unlock)
4933 CHECK_MUTEX( mutex_trylock)
4934 CHECK_MUTEX(_mutex_trylock)
4935
4936 #define CHECK_COND(cond_op) \
4937 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV);
4938
4939 CHECK_COND( cond_wait);
4940 CHECK_COND(_cond_wait);
4941 CHECK_COND(_cond_wait_cancel);
4942
4943 #define CHECK_COND2(cond_op) \
4944 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV);
4945
4946 CHECK_COND2( cond_timedwait);
4947 CHECK_COND2(_cond_timedwait);
4948 CHECK_COND2(_cond_timedwait_cancel);
4949
4950 // do the _lwp_* versions too
4951 #define mutex_t lwp_mutex_t
4952 #define cond_t lwp_cond_t
4953 CHECK_MUTEX( _lwp_mutex_lock)
4954 CHECK_MUTEX( _lwp_mutex_unlock)
4955 CHECK_MUTEX( _lwp_mutex_trylock)
4956 CHECK_MUTEX( __lwp_mutex_lock)
4957 CHECK_MUTEX( __lwp_mutex_unlock)
4958 CHECK_MUTEX( __lwp_mutex_trylock)
4959 CHECK_MUTEX(___lwp_mutex_lock)
4960 CHECK_MUTEX(___lwp_mutex_unlock)
4961
4962 CHECK_COND( _lwp_cond_wait);
4963 CHECK_COND( __lwp_cond_wait);
4964 CHECK_COND(___lwp_cond_wait);
4965
4966 CHECK_COND2( _lwp_cond_timedwait);
4967 CHECK_COND2( __lwp_cond_timedwait);
4968 #undef mutex_t
4969 #undef cond_t
4970
4971 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4972 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0);
4973 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0);
4974 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0);
4975 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4976 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p));
4977 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4978 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV);
4979
4980
4981 // recording machinery:
4982
4983 enum { RECORD_SYNCH_LIMIT = 200 };
4984 char* record_synch_name[RECORD_SYNCH_LIMIT];
4985 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT];
4986 bool record_synch_returning[RECORD_SYNCH_LIMIT];
4987 thread_t record_synch_thread[RECORD_SYNCH_LIMIT];
4988 int record_synch_count = 0;
4989 bool record_synch_enabled = false;
4990
4991 // in dbx, examine recorded data this way:
4992 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done
4993
4994 void record_synch(char* name, bool returning) {
4995 if (record_synch_enabled) {
4996 if (record_synch_count < RECORD_SYNCH_LIMIT) {
4997 record_synch_name[record_synch_count] = name;
4998 record_synch_returning[record_synch_count] = returning;
4999 record_synch_thread[record_synch_count] = thr_self();
5000 record_synch_arg0ptr[record_synch_count] = &name;
5001 record_synch_count++;
5002 }
5003 // put more checking code here:
5004 // ...
5005 }
5006 }
5007
5008 void record_synch_enable() {
5009 // start collecting trace data, if not already doing so
5010 if (!record_synch_enabled) record_synch_count = 0;
5011 record_synch_enabled = true;
5012 }
5013
5014 void record_synch_disable() {
5015 // stop collecting trace data
5016 record_synch_enabled = false;
5017 }
5018
5019 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS
5020 #endif // PRODUCT
5021
5022 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5023 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) -
5024 (intptr_t)(&((prusage_t *)(NULL))->pr_utime);
5025
5026
5027 // JVMTI & JVM monitoring and management support
5028 // The thread_cpu_time() and current_thread_cpu_time() are only
5029 // supported if is_thread_cpu_time_supported() returns true.
5030 // They are not supported on Solaris T1.
5031
5032 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
5033 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
5034 // of a thread.
5035 //
5036 // current_thread_cpu_time() and thread_cpu_time(Thread *)
5037 // returns the fast estimate available on the platform.
5038
5039 // hrtime_t gethrvtime() return value includes
5040 // user time but does not include system time
5041 jlong os::current_thread_cpu_time() {
5042 return (jlong) gethrvtime();
5043 }
5044
5045 jlong os::thread_cpu_time(Thread *thread) {
5046 // return user level CPU time only to be consistent with
5047 // what current_thread_cpu_time returns.
5048 // thread_cpu_time_info() must be changed if this changes
5049 return os::thread_cpu_time(thread, false /* user time only */);
5050 }
5051
5052 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
5053 if (user_sys_cpu_time) {
5054 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
5055 } else {
5056 return os::current_thread_cpu_time();
5057 }
5058 }
5059
5060 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
5061 char proc_name[64];
5062 int count;
5063 prusage_t prusage;
5064 jlong lwp_time;
5065 int fd;
5066
5067 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage",
5068 getpid(),
5069 thread->osthread()->lwp_id());
5070 fd = ::open(proc_name, O_RDONLY);
5071 if (fd == -1) return -1;
5072
5073 do {
5074 count = ::pread(fd,
5075 (void *)&prusage.pr_utime,
5076 thr_time_size,
5077 thr_time_off);
5078 } while (count < 0 && errno == EINTR);
5079 ::close(fd);
5080 if (count < 0) return -1;
5081
5082 if (user_sys_cpu_time) {
5083 // user + system CPU time
5084 lwp_time = (((jlong)prusage.pr_stime.tv_sec +
5085 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) +
5086 (jlong)prusage.pr_stime.tv_nsec +
5087 (jlong)prusage.pr_utime.tv_nsec;
5088 } else {
5089 // user level CPU time only
5090 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) +
5091 (jlong)prusage.pr_utime.tv_nsec;
5092 }
5093
5094 return (lwp_time);
5095 }
5096
5097 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5098 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5099 info_ptr->may_skip_backward = false; // elapsed time not wall time
5100 info_ptr->may_skip_forward = false; // elapsed time not wall time
5101 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5102 }
5103
5104 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
5105 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
5106 info_ptr->may_skip_backward = false; // elapsed time not wall time
5107 info_ptr->may_skip_forward = false; // elapsed time not wall time
5108 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned
5109 }
5110
5111 bool os::is_thread_cpu_time_supported() {
5112 return true;
5113 }
5114
5115 // System loadavg support. Returns -1 if load average cannot be obtained.
5116 // Return the load average for our processor set if the primitive exists
5117 // (Solaris 9 and later). Otherwise just return system wide loadavg.
5118 int os::loadavg(double loadavg[], int nelem) {
5119 if (pset_getloadavg_ptr != NULL) {
5120 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem);
5121 } else {
5122 return ::getloadavg(loadavg, nelem);
5123 }
5124 }
5125
5126 //---------------------------------------------------------------------------------
5127
5128 bool os::find(address addr, outputStream* st) {
5129 Dl_info dlinfo;
5130 memset(&dlinfo, 0, sizeof(dlinfo));
5131 if (dladdr(addr, &dlinfo) != 0) {
5132 st->print(PTR_FORMAT ": ", addr);
5133 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) {
5134 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr);
5135 } else if (dlinfo.dli_fbase != NULL) {
5136 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase);
5137 } else {
5138 st->print("<absolute address>");
5139 }
5140 if (dlinfo.dli_fname != NULL) {
5141 st->print(" in %s", dlinfo.dli_fname);
5142 }
5143 if (dlinfo.dli_fbase != NULL) {
5144 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase);
5145 }
5146 st->cr();
5147
5148 if (Verbose) {
5149 // decode some bytes around the PC
5150 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size());
5151 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size());
5152 address lowest = (address) dlinfo.dli_sname;
5153 if (!lowest) lowest = (address) dlinfo.dli_fbase;
5154 if (begin < lowest) begin = lowest;
5155 Dl_info dlinfo2;
5156 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr
5157 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) {
5158 end = (address) dlinfo2.dli_saddr;
5159 }
5160 Disassembler::decode(begin, end, st);
5161 }
5162 return true;
5163 }
5164 return false;
5165 }
5166
5167 // Following function has been added to support HotSparc's libjvm.so running
5168 // under Solaris production JDK 1.2.2 / 1.3.0. These came from
5169 // src/solaris/hpi/native_threads in the EVM codebase.
5170 //
5171 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release
5172 // libraries and should thus be removed. We will leave it behind for a while
5173 // until we no longer want to able to run on top of 1.3.0 Solaris production
5174 // JDK. See 4341971.
5175
5176 #define STACK_SLACK 0x800
5177
5178 extern "C" {
5179 intptr_t sysThreadAvailableStackWithSlack() {
5180 stack_t st;
5181 intptr_t retval, stack_top;
5182 retval = thr_stksegment(&st);
5183 assert(retval == 0, "incorrect return value from thr_stksegment");
5184 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned");
5185 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned");
5186 stack_top=(intptr_t)st.ss_sp-st.ss_size;
5187 return ((intptr_t)&stack_top - stack_top - STACK_SLACK);
5188 }
5189 }
5190
5191 // ObjectMonitor park-unpark infrastructure ...
5192 //
5193 // We implement Solaris and Linux PlatformEvents with the
5194 // obvious condvar-mutex-flag triple.
5195 // Another alternative that works quite well is pipes:
5196 // Each PlatformEvent consists of a pipe-pair.
5197 // The thread associated with the PlatformEvent
5198 // calls park(), which reads from the input end of the pipe.
5199 // Unpark() writes into the other end of the pipe.
5200 // The write-side of the pipe must be set NDELAY.
5201 // Unfortunately pipes consume a large # of handles.
5202 // Native solaris lwp_park() and lwp_unpark() work nicely, too.
5203 // Using pipes for the 1st few threads might be workable, however.
5204 //
5205 // park() is permitted to return spuriously.
5206 // Callers of park() should wrap the call to park() in
5207 // an appropriate loop. A litmus test for the correct
5208 // usage of park is the following: if park() were modified
5209 // to immediately return 0 your code should still work,
5210 // albeit degenerating to a spin loop.
5211 //
5212 // In a sense, park()-unpark() just provides more polite spinning
5213 // and polling with the key difference over naive spinning being
5214 // that a parked thread needs to be explicitly unparked() in order
5215 // to wake up and to poll the underlying condition.
5216 //
5217 // Assumption:
5218 // Only one parker can exist on an event, which is why we allocate
5219 // them per-thread. Multiple unparkers can coexist.
5220 //
5221 // _Event transitions in park()
5222 // -1 => -1 : illegal
5223 // 1 => 0 : pass - return immediately
5224 // 0 => -1 : block; then set _Event to 0 before returning
5225 //
5226 // _Event transitions in unpark()
5227 // 0 => 1 : just return
5228 // 1 => 1 : just return
5229 // -1 => either 0 or 1; must signal target thread
5230 // That is, we can safely transition _Event from -1 to either
5231 // 0 or 1.
5232 //
5233 // _Event serves as a restricted-range semaphore.
5234 // -1 : thread is blocked, i.e. there is a waiter
5235 // 0 : neutral: thread is running or ready,
5236 // could have been signaled after a wait started
5237 // 1 : signaled - thread is running or ready
5238 //
5239 // Another possible encoding of _Event would be with
5240 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits.
5241 //
5242 // TODO-FIXME: add DTRACE probes for:
5243 // 1. Tx parks
5244 // 2. Ty unparks Tx
5245 // 3. Tx resumes from park
5246
5247
5248 // value determined through experimentation
5249 #define ROUNDINGFIX 11
5250
5251 // utility to compute the abstime argument to timedwait.
5252 // TODO-FIXME: switch from compute_abstime() to unpackTime().
5253
5254 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) {
5255 // millis is the relative timeout time
5256 // abstime will be the absolute timeout time
5257 if (millis < 0) millis = 0;
5258 struct timeval now;
5259 int status = gettimeofday(&now, NULL);
5260 assert(status == 0, "gettimeofday");
5261 jlong seconds = millis / 1000;
5262 jlong max_wait_period;
5263
5264 if (UseLWPSynchronization) {
5265 // forward port of fix for 4275818 (not sleeping long enough)
5266 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where
5267 // _lwp_cond_timedwait() used a round_down algorithm rather
5268 // than a round_up. For millis less than our roundfactor
5269 // it rounded down to 0 which doesn't meet the spec.
5270 // For millis > roundfactor we may return a bit sooner, but
5271 // since we can not accurately identify the patch level and
5272 // this has already been fixed in Solaris 9 and 8 we will
5273 // leave it alone rather than always rounding down.
5274
5275 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX;
5276 // It appears that when we go directly through Solaris _lwp_cond_timedwait()
5277 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6
5278 max_wait_period = 21000000;
5279 } else {
5280 max_wait_period = 50000000;
5281 }
5282 millis %= 1000;
5283 if (seconds > max_wait_period) { // see man cond_timedwait(3T)
5284 seconds = max_wait_period;
5285 }
5286 abstime->tv_sec = now.tv_sec + seconds;
5287 long usec = now.tv_usec + millis * 1000;
5288 if (usec >= 1000000) {
5289 abstime->tv_sec += 1;
5290 usec -= 1000000;
5291 }
5292 abstime->tv_nsec = usec * 1000;
5293 return abstime;
5294 }
5295
5296 void os::PlatformEvent::park() { // AKA: down()
5297 // Transitions for _Event:
5298 // -1 => -1 : illegal
5299 // 1 => 0 : pass - return immediately
5300 // 0 => -1 : block; then set _Event to 0 before returning
5301
5302 // Invariant: Only the thread associated with the Event/PlatformEvent
5303 // may call park().
5304 assert(_nParked == 0, "invariant");
5305
5306 int v;
5307 for (;;) {
5308 v = _Event;
5309 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5310 }
5311 guarantee(v >= 0, "invariant");
5312 if (v == 0) {
5313 // Do this the hard way by blocking ...
5314 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5315 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5316 // Only for SPARC >= V8PlusA
5317 #if defined(__sparc) && defined(COMPILER2)
5318 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5319 #endif
5320 int status = os::Solaris::mutex_lock(_mutex);
5321 assert_status(status == 0, status, "mutex_lock");
5322 guarantee(_nParked == 0, "invariant");
5323 ++_nParked;
5324 while (_Event < 0) {
5325 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ...
5326 // Treat this the same as if the wait was interrupted
5327 // With usr/lib/lwp going to kernel, always handle ETIME
5328 status = os::Solaris::cond_wait(_cond, _mutex);
5329 if (status == ETIME) status = EINTR;
5330 assert_status(status == 0 || status == EINTR, status, "cond_wait");
5331 }
5332 --_nParked;
5333 _Event = 0;
5334 status = os::Solaris::mutex_unlock(_mutex);
5335 assert_status(status == 0, status, "mutex_unlock");
5336 // Paranoia to ensure our locked and lock-free paths interact
5337 // correctly with each other.
5338 OrderAccess::fence();
5339 }
5340 }
5341
5342 int os::PlatformEvent::park(jlong millis) {
5343 // Transitions for _Event:
5344 // -1 => -1 : illegal
5345 // 1 => 0 : pass - return immediately
5346 // 0 => -1 : block; then set _Event to 0 before returning
5347
5348 guarantee(_nParked == 0, "invariant");
5349 int v;
5350 for (;;) {
5351 v = _Event;
5352 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break;
5353 }
5354 guarantee(v >= 0, "invariant");
5355 if (v != 0) return OS_OK;
5356
5357 int ret = OS_TIMEOUT;
5358 timestruc_t abst;
5359 compute_abstime(&abst, millis);
5360
5361 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5362 // For Solaris SPARC set fprs.FEF=0 prior to parking.
5363 // Only for SPARC >= V8PlusA
5364 #if defined(__sparc) && defined(COMPILER2)
5365 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5366 #endif
5367 int status = os::Solaris::mutex_lock(_mutex);
5368 assert_status(status == 0, status, "mutex_lock");
5369 guarantee(_nParked == 0, "invariant");
5370 ++_nParked;
5371 while (_Event < 0) {
5372 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst);
5373 assert_status(status == 0 || status == EINTR ||
5374 status == ETIME || status == ETIMEDOUT,
5375 status, "cond_timedwait");
5376 if (!FilterSpuriousWakeups) break; // previous semantics
5377 if (status == ETIME || status == ETIMEDOUT) break;
5378 // We consume and ignore EINTR and spurious wakeups.
5379 }
5380 --_nParked;
5381 if (_Event >= 0) ret = OS_OK;
5382 _Event = 0;
5383 status = os::Solaris::mutex_unlock(_mutex);
5384 assert_status(status == 0, status, "mutex_unlock");
5385 // Paranoia to ensure our locked and lock-free paths interact
5386 // correctly with each other.
5387 OrderAccess::fence();
5388 return ret;
5389 }
5390
5391 void os::PlatformEvent::unpark() {
5392 // Transitions for _Event:
5393 // 0 => 1 : just return
5394 // 1 => 1 : just return
5395 // -1 => either 0 or 1; must signal target thread
5396 // That is, we can safely transition _Event from -1 to either
5397 // 0 or 1.
5398 // See also: "Semaphores in Plan 9" by Mullender & Cox
5399 //
5400 // Note: Forcing a transition from "-1" to "1" on an unpark() means
5401 // that it will take two back-to-back park() calls for the owning
5402 // thread to block. This has the benefit of forcing a spurious return
5403 // from the first park() call after an unpark() call which will help
5404 // shake out uses of park() and unpark() without condition variables.
5405
5406 if (Atomic::xchg(1, &_Event) >= 0) return;
5407
5408 // If the thread associated with the event was parked, wake it.
5409 // Wait for the thread assoc with the PlatformEvent to vacate.
5410 int status = os::Solaris::mutex_lock(_mutex);
5411 assert_status(status == 0, status, "mutex_lock");
5412 int AnyWaiters = _nParked;
5413 status = os::Solaris::mutex_unlock(_mutex);
5414 assert_status(status == 0, status, "mutex_unlock");
5415 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant");
5416 if (AnyWaiters != 0) {
5417 // Note that we signal() *after* dropping the lock for "immortal" Events.
5418 // This is safe and avoids a common class of futile wakeups. In rare
5419 // circumstances this can cause a thread to return prematurely from
5420 // cond_{timed}wait() but the spurious wakeup is benign and the victim
5421 // will simply re-test the condition and re-park itself.
5422 // This provides particular benefit if the underlying platform does not
5423 // provide wait morphing.
5424 status = os::Solaris::cond_signal(_cond);
5425 assert_status(status == 0, status, "cond_signal");
5426 }
5427 }
5428
5429 // JSR166
5430 // -------------------------------------------------------
5431
5432 // The solaris and linux implementations of park/unpark are fairly
5433 // conservative for now, but can be improved. They currently use a
5434 // mutex/condvar pair, plus _counter.
5435 // Park decrements _counter if > 0, else does a condvar wait. Unpark
5436 // sets count to 1 and signals condvar. Only one thread ever waits
5437 // on the condvar. Contention seen when trying to park implies that someone
5438 // is unparking you, so don't wait. And spurious returns are fine, so there
5439 // is no need to track notifications.
5440
5441 #define MAX_SECS 100000000
5442
5443 // This code is common to linux and solaris and will be moved to a
5444 // common place in dolphin.
5445 //
5446 // The passed in time value is either a relative time in nanoseconds
5447 // or an absolute time in milliseconds. Either way it has to be unpacked
5448 // into suitable seconds and nanoseconds components and stored in the
5449 // given timespec structure.
5450 // Given time is a 64-bit value and the time_t used in the timespec is only
5451 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
5452 // overflow if times way in the future are given. Further on Solaris versions
5453 // prior to 10 there is a restriction (see cond_timedwait) that the specified
5454 // number of seconds, in abstime, is less than current_time + 100,000,000.
5455 // As it will be 28 years before "now + 100000000" will overflow we can
5456 // ignore overflow and just impose a hard-limit on seconds using the value
5457 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
5458 // years from "now".
5459 //
5460 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
5461 assert(time > 0, "convertTime");
5462
5463 struct timeval now;
5464 int status = gettimeofday(&now, NULL);
5465 assert(status == 0, "gettimeofday");
5466
5467 time_t max_secs = now.tv_sec + MAX_SECS;
5468
5469 if (isAbsolute) {
5470 jlong secs = time / 1000;
5471 if (secs > max_secs) {
5472 absTime->tv_sec = max_secs;
5473 } else {
5474 absTime->tv_sec = secs;
5475 }
5476 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5477 } else {
5478 jlong secs = time / NANOSECS_PER_SEC;
5479 if (secs >= MAX_SECS) {
5480 absTime->tv_sec = max_secs;
5481 absTime->tv_nsec = 0;
5482 } else {
5483 absTime->tv_sec = now.tv_sec + secs;
5484 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5485 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5486 absTime->tv_nsec -= NANOSECS_PER_SEC;
5487 ++absTime->tv_sec; // note: this must be <= max_secs
5488 }
5489 }
5490 }
5491 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5492 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5493 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5494 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5495 }
5496
5497 void Parker::park(bool isAbsolute, jlong time) {
5498 // Ideally we'd do something useful while spinning, such
5499 // as calling unpackTime().
5500
5501 // Optional fast-path check:
5502 // Return immediately if a permit is available.
5503 // We depend on Atomic::xchg() having full barrier semantics
5504 // since we are doing a lock-free update to _counter.
5505 if (Atomic::xchg(0, &_counter) > 0) return;
5506
5507 // Optional fast-exit: Check interrupt before trying to wait
5508 Thread* thread = Thread::current();
5509 assert(thread->is_Java_thread(), "Must be JavaThread");
5510 JavaThread *jt = (JavaThread *)thread;
5511 if (Thread::is_interrupted(thread, false)) {
5512 return;
5513 }
5514
5515 // First, demultiplex/decode time arguments
5516 timespec absTime;
5517 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5518 return;
5519 }
5520 if (time > 0) {
5521 // Warning: this code might be exposed to the old Solaris time
5522 // round-down bugs. Grep "roundingFix" for details.
5523 unpackTime(&absTime, isAbsolute, time);
5524 }
5525
5526 // Enter safepoint region
5527 // Beware of deadlocks such as 6317397.
5528 // The per-thread Parker:: _mutex is a classic leaf-lock.
5529 // In particular a thread must never block on the Threads_lock while
5530 // holding the Parker:: mutex. If safepoints are pending both the
5531 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5532 ThreadBlockInVM tbivm(jt);
5533
5534 // Don't wait if cannot get lock since interference arises from
5535 // unblocking. Also. check interrupt before trying wait
5536 if (Thread::is_interrupted(thread, false) ||
5537 os::Solaris::mutex_trylock(_mutex) != 0) {
5538 return;
5539 }
5540
5541 int status;
5542
5543 if (_counter > 0) { // no wait needed
5544 _counter = 0;
5545 status = os::Solaris::mutex_unlock(_mutex);
5546 assert(status == 0, "invariant");
5547 // Paranoia to ensure our locked and lock-free paths interact
5548 // correctly with each other and Java-level accesses.
5549 OrderAccess::fence();
5550 return;
5551 }
5552
5553 #ifdef ASSERT
5554 // Don't catch signals while blocked; let the running threads have the signals.
5555 // (This allows a debugger to break into the running thread.)
5556 sigset_t oldsigs;
5557 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals();
5558 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5559 #endif
5560
5561 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5562 jt->set_suspend_equivalent();
5563 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5564
5565 // Do this the hard way by blocking ...
5566 // See http://monaco.sfbay/detail.jsf?cr=5094058.
5567 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking.
5568 // Only for SPARC >= V8PlusA
5569 #if defined(__sparc) && defined(COMPILER2)
5570 if (ClearFPUAtPark) { _mark_fpu_nosave(); }
5571 #endif
5572
5573 if (time == 0) {
5574 status = os::Solaris::cond_wait(_cond, _mutex);
5575 } else {
5576 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime);
5577 }
5578 // Note that an untimed cond_wait() can sometimes return ETIME on older
5579 // versions of the Solaris.
5580 assert_status(status == 0 || status == EINTR ||
5581 status == ETIME || status == ETIMEDOUT,
5582 status, "cond_timedwait");
5583
5584 #ifdef ASSERT
5585 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
5586 #endif
5587 _counter = 0;
5588 status = os::Solaris::mutex_unlock(_mutex);
5589 assert_status(status == 0, status, "mutex_unlock");
5590 // Paranoia to ensure our locked and lock-free paths interact
5591 // correctly with each other and Java-level accesses.
5592 OrderAccess::fence();
5593
5594 // If externally suspended while waiting, re-suspend
5595 if (jt->handle_special_suspend_equivalent_condition()) {
5596 jt->java_suspend_self();
5597 }
5598 }
5599
5600 void Parker::unpark() {
5601 int status = os::Solaris::mutex_lock(_mutex);
5602 assert(status == 0, "invariant");
5603 const int s = _counter;
5604 _counter = 1;
5605 status = os::Solaris::mutex_unlock(_mutex);
5606 assert(status == 0, "invariant");
5607
5608 if (s < 1) {
5609 status = os::Solaris::cond_signal(_cond);
5610 assert(status == 0, "invariant");
5611 }
5612 }
5613
5614 extern char** environ;
5615
5616 // Run the specified command in a separate process. Return its exit value,
5617 // or -1 on failure (e.g. can't fork a new process).
5618 // Unlike system(), this function can be called from signal handler. It
5619 // doesn't block SIGINT et al.
5620 int os::fork_and_exec(char* cmd) {
5621 char * argv[4];
5622 argv[0] = (char *)"sh";
5623 argv[1] = (char *)"-c";
5624 argv[2] = cmd;
5625 argv[3] = NULL;
5626
5627 // fork is async-safe, fork1 is not so can't use in signal handler
5628 pid_t pid;
5629 Thread* t = Thread::current_or_null_safe();
5630 if (t != NULL && t->is_inside_signal_handler()) {
5631 pid = fork();
5632 } else {
5633 pid = fork1();
5634 }
5635
5636 if (pid < 0) {
5637 // fork failed
5638 warning("fork failed: %s", os::strerror(errno));
5639 return -1;
5640
5641 } else if (pid == 0) {
5642 // child process
5643
5644 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris
5645 execve("/usr/bin/sh", argv, environ);
5646
5647 // execve failed
5648 _exit(-1);
5649
5650 } else {
5651 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5652 // care about the actual exit code, for now.
5653
5654 int status;
5655
5656 // Wait for the child process to exit. This returns immediately if
5657 // the child has already exited. */
5658 while (waitpid(pid, &status, 0) < 0) {
5659 switch (errno) {
5660 case ECHILD: return 0;
5661 case EINTR: break;
5662 default: return -1;
5663 }
5664 }
5665
5666 if (WIFEXITED(status)) {
5667 // The child exited normally; get its exit code.
5668 return WEXITSTATUS(status);
5669 } else if (WIFSIGNALED(status)) {
5670 // The child exited because of a signal
5671 // The best value to return is 0x80 + signal number,
5672 // because that is what all Unix shells do, and because
5673 // it allows callers to distinguish between process exit and
5674 // process death by signal.
5675 return 0x80 + WTERMSIG(status);
5676 } else {
5677 // Unknown exit code; pass it through
5678 return status;
5679 }
5680 }
5681 }
5682
5683 // is_headless_jre()
5684 //
5685 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5686 // in order to report if we are running in a headless jre
5687 //
5688 // Since JDK8 xawt/libmawt.so was moved into the same directory
5689 // as libawt.so, and renamed libawt_xawt.so
5690 //
5691 bool os::is_headless_jre() {
5692 struct stat statbuf;
5693 char buf[MAXPATHLEN];
5694 char libmawtpath[MAXPATHLEN];
5695 const char *xawtstr = "/xawt/libmawt.so";
5696 const char *new_xawtstr = "/libawt_xawt.so";
5697 char *p;
5698
5699 // Get path to libjvm.so
5700 os::jvm_path(buf, sizeof(buf));
5701
5702 // Get rid of libjvm.so
5703 p = strrchr(buf, '/');
5704 if (p == NULL) {
5705 return false;
5706 } else {
5707 *p = '\0';
5708 }
5709
5710 // Get rid of client or server
5711 p = strrchr(buf, '/');
5712 if (p == NULL) {
5713 return false;
5714 } else {
5715 *p = '\0';
5716 }
5717
5718 // check xawt/libmawt.so
5719 strcpy(libmawtpath, buf);
5720 strcat(libmawtpath, xawtstr);
5721 if (::stat(libmawtpath, &statbuf) == 0) return false;
5722
5723 // check libawt_xawt.so
5724 strcpy(libmawtpath, buf);
5725 strcat(libmawtpath, new_xawtstr);
5726 if (::stat(libmawtpath, &statbuf) == 0) return false;
5727
5728 return true;
5729 }
5730
5731 size_t os::write(int fd, const void *buf, unsigned int nBytes) {
5732 size_t res;
5733 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res);
5734 return res;
5735 }
5736
5737 int os::close(int fd) {
5738 return ::close(fd);
5739 }
5740
5741 int os::socket_close(int fd) {
5742 return ::close(fd);
5743 }
5744
5745 int os::recv(int fd, char* buf, size_t nBytes, uint flags) {
5746 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5747 "Assumed _thread_in_native");
5748 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags));
5749 }
5750
5751 int os::send(int fd, char* buf, size_t nBytes, uint flags) {
5752 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native,
5753 "Assumed _thread_in_native");
5754 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5755 }
5756
5757 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) {
5758 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags));
5759 }
5760
5761 // As both poll and select can be interrupted by signals, we have to be
5762 // prepared to restart the system call after updating the timeout, unless
5763 // a poll() is done with timeout == -1, in which case we repeat with this
5764 // "wait forever" value.
5765
5766 int os::connect(int fd, struct sockaddr *him, socklen_t len) {
5767 int _result;
5768 _result = ::connect(fd, him, len);
5769
5770 // On Solaris, when a connect() call is interrupted, the connection
5771 // can be established asynchronously (see 6343810). Subsequent calls
5772 // to connect() must check the errno value which has the semantic
5773 // described below (copied from the connect() man page). Handling
5774 // of asynchronously established connections is required for both
5775 // blocking and non-blocking sockets.
5776 // EINTR The connection attempt was interrupted
5777 // before any data arrived by the delivery of
5778 // a signal. The connection, however, will be
5779 // established asynchronously.
5780 //
5781 // EINPROGRESS The socket is non-blocking, and the connec-
5782 // tion cannot be completed immediately.
5783 //
5784 // EALREADY The socket is non-blocking, and a previous
5785 // connection attempt has not yet been com-
5786 // pleted.
5787 //
5788 // EISCONN The socket is already connected.
5789 if (_result == OS_ERR && errno == EINTR) {
5790 // restarting a connect() changes its errno semantics
5791 RESTARTABLE(::connect(fd, him, len), _result);
5792 // undo these changes
5793 if (_result == OS_ERR) {
5794 if (errno == EALREADY) {
5795 errno = EINPROGRESS; // fall through
5796 } else if (errno == EISCONN) {
5797 errno = 0;
5798 return OS_OK;
5799 }
5800 }
5801 }
5802 return _result;
5803 }
5804
5805 // Get the default path to the core file
5806 // Returns the length of the string
5807 int os::get_core_path(char* buffer, size_t bufferSize) {
5808 const char* p = get_current_directory(buffer, bufferSize);
5809
5810 if (p == NULL) {
5811 assert(p != NULL, "failed to get current directory");
5812 return 0;
5813 }
5814
5815 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5816 p, current_process_id());
5817
5818 return strlen(buffer);
5819 }
5820
5821 #ifndef PRODUCT
5822 void TestReserveMemorySpecial_test() {
5823 // No tests available for this platform
5824 }
5825 #endif
5826
5827 bool os::start_debugging(char *buf, int buflen) {
5828 int len = (int)strlen(buf);
5829 char *p = &buf[len];
5830
5831 jio_snprintf(p, buflen-len,
5832 "\n\n"
5833 "Do you want to debug the problem?\n\n"
5834 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
5835 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
5836 "Otherwise, press RETURN to abort...",
5837 os::current_process_id(), os::current_thread_id());
5838
5839 bool yes = os::message_box("Unexpected Error", buf);
5840
5841 if (yes) {
5842 // yes, user asked VM to launch debugger
5843 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id());
5844
5845 os::fork_and_exec(buf);
5846 yes = false;
5847 }
5848 return yes;
5849 }