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