1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2014 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_aix.h"
39 #include "libperfstat_aix.hpp"
40 #include "loadlib_aix.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/filemap.hpp"
43 #include "mutex_aix.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "os_share_aix.hpp"
46 #include "porting_aix.hpp"
47 #include "prims/jniFastGetField.hpp"
48 #include "prims/jvm.h"
49 #include "prims/jvm_misc.hpp"
50 #include "runtime/arguments.hpp"
51 #include "runtime/extendedPC.hpp"
52 #include "runtime/globals.hpp"
53 #include "runtime/interfaceSupport.hpp"
54 #include "runtime/java.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/mutexLocker.hpp"
57 #include "runtime/objectMonitor.hpp"
58 #include "runtime/orderAccess.inline.hpp"
59 #include "runtime/osThread.hpp"
60 #include "runtime/perfMemory.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/statSampler.hpp"
63 #include "runtime/stubRoutines.hpp"
64 #include "runtime/thread.inline.hpp"
65 #include "runtime/threadCritical.hpp"
66 #include "runtime/timer.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/decoder.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/vmError.hpp"
74
75 // put OS-includes here (sorted alphabetically)
76 #include <errno.h>
77 #include <fcntl.h>
78 #include <inttypes.h>
79 #include <poll.h>
80 #include <procinfo.h>
81 #include <pthread.h>
82 #include <pwd.h>
83 #include <semaphore.h>
84 #include <signal.h>
85 #include <stdint.h>
86 #include <stdio.h>
87 #include <string.h>
88 #include <unistd.h>
89 #include <sys/ioctl.h>
90 #include <sys/ipc.h>
91 #include <sys/mman.h>
92 #include <sys/resource.h>
93 #include <sys/select.h>
94 #include <sys/shm.h>
95 #include <sys/socket.h>
96 #include <sys/stat.h>
97 #include <sys/sysinfo.h>
98 #include <sys/systemcfg.h>
99 #include <sys/time.h>
100 #include <sys/times.h>
101 #include <sys/types.h>
102 #include <sys/utsname.h>
103 #include <sys/vminfo.h>
104 #include <sys/wait.h>
105
106 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
107 #if !defined(_AIXVERSION_610)
108 extern "C" {
109 int getthrds64(pid_t ProcessIdentifier,
110 struct thrdentry64* ThreadBuffer,
111 int ThreadSize,
112 tid64_t* IndexPointer,
113 int Count);
114 }
115 #endif
116
117 #define MAX_PATH (2 * K)
118
119 // for timer info max values which include all bits
120 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
121 // for multipage initialization error analysis (in 'g_multipage_error')
122 #define ERROR_MP_OS_TOO_OLD 100
123 #define ERROR_MP_EXTSHM_ACTIVE 101
124 #define ERROR_MP_VMGETINFO_FAILED 102
125 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
126
127 // The semantics in this file are thus that codeptr_t is a *real code ptr*.
128 // This means that any function taking codeptr_t as arguments will assume
129 // a real codeptr and won't handle function descriptors (eg getFuncName),
130 // whereas functions taking address as args will deal with function
131 // descriptors (eg os::dll_address_to_library_name).
132 typedef unsigned int* codeptr_t;
133
134 // Typedefs for stackslots, stack pointers, pointers to op codes.
135 typedef unsigned long stackslot_t;
136 typedef stackslot_t* stackptr_t;
137
138 // Excerpts from systemcfg.h definitions newer than AIX 5.3.
139 #ifndef PV_7
140 #define PV_7 0x200000 /* Power PC 7 */
141 #define PV_7_Compat 0x208000 /* Power PC 7 */
142 #endif
143 #ifndef PV_8
144 #define PV_8 0x300000 /* Power PC 8 */
145 #define PV_8_Compat 0x308000 /* Power PC 8 */
146 #endif
147
148 #define trcVerbose(fmt, ...) { /* PPC port */ \
149 if (Verbose) { \
150 fprintf(stderr, fmt, ##__VA_ARGS__); \
151 fputc('\n', stderr); fflush(stderr); \
152 } \
153 }
154 #define trc(fmt, ...) /* PPC port */
155
156 #define ERRBYE(s) { \
157 trcVerbose(s); \
158 return -1; \
159 }
160
161 // query dimensions of the stack of the calling thread
162 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
163
164 // function to check a given stack pointer against given stack limits
165 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
166 if (((uintptr_t)sp) & 0x7) {
167 return false;
168 }
169 if (sp > stack_base) {
170 return false;
171 }
172 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
173 return false;
174 }
175 return true;
176 }
177
178 // returns true if function is a valid codepointer
179 inline bool is_valid_codepointer(codeptr_t p) {
180 if (!p) {
181 return false;
182 }
183 if (((uintptr_t)p) & 0x3) {
184 return false;
185 }
186 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
187 return false;
188 }
189 return true;
190 }
191
192 // Macro to check a given stack pointer against given stack limits and to die if test fails.
193 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
194 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
195 }
196
197 // Macro to check the current stack pointer against given stacklimits.
198 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
199 address sp; \
200 sp = os::current_stack_pointer(); \
201 CHECK_STACK_PTR(sp, stack_base, stack_size); \
202 }
203
204 ////////////////////////////////////////////////////////////////////////////////
205 // global variables (for a description see os_aix.hpp)
206
207 julong os::Aix::_physical_memory = 0;
208 pthread_t os::Aix::_main_thread = ((pthread_t)0);
209 int os::Aix::_page_size = -1;
210 int os::Aix::_on_pase = -1;
211 int os::Aix::_os_version = -1;
212 int os::Aix::_stack_page_size = -1;
213 size_t os::Aix::_shm_default_page_size = -1;
214 int os::Aix::_can_use_64K_pages = -1;
215 int os::Aix::_can_use_16M_pages = -1;
216 int os::Aix::_xpg_sus_mode = -1;
217 int os::Aix::_extshm = -1;
218 int os::Aix::_logical_cpus = -1;
219
220 ////////////////////////////////////////////////////////////////////////////////
221 // local variables
222
223 static int g_multipage_error = -1; // error analysis for multipage initialization
224 static jlong initial_time_count = 0;
225 static int clock_tics_per_sec = 100;
226 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
227 static bool check_signals = true;
228 static pid_t _initial_pid = 0;
229 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
230 static sigset_t SR_sigset;
231 static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls.
232
233 julong os::available_memory() {
234 return Aix::available_memory();
235 }
236
237 julong os::Aix::available_memory() {
238 os::Aix::meminfo_t mi;
239 if (os::Aix::get_meminfo(&mi)) {
240 return mi.real_free;
241 } else {
242 return 0xFFFFFFFFFFFFFFFFLL;
243 }
244 }
245
246 julong os::physical_memory() {
247 return Aix::physical_memory();
248 }
249
250 ////////////////////////////////////////////////////////////////////////////////
251 // environment support
252
253 bool os::getenv(const char* name, char* buf, int len) {
254 const char* val = ::getenv(name);
255 if (val != NULL && strlen(val) < (size_t)len) {
256 strcpy(buf, val);
257 return true;
258 }
259 if (len > 0) buf[0] = 0; // return a null string
260 return false;
261 }
262
263 // Return true if user is running as root.
264
265 bool os::have_special_privileges() {
266 static bool init = false;
267 static bool privileges = false;
268 if (!init) {
269 privileges = (getuid() != geteuid()) || (getgid() != getegid());
270 init = true;
271 }
272 return privileges;
273 }
274
275 // Helper function, emulates disclaim64 using multiple 32bit disclaims
276 // because we cannot use disclaim64() on AS/400 and old AIX releases.
277 static bool my_disclaim64(char* addr, size_t size) {
278
279 if (size == 0) {
280 return true;
281 }
282
283 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
284 const unsigned int maxDisclaimSize = 0x80000000;
285
286 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
287 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
288
289 char* p = addr;
290
291 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
292 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
293 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
294 return false;
295 }
296 p += maxDisclaimSize;
297 }
298
299 if (lastDisclaimSize > 0) {
300 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
301 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
302 return false;
303 }
304 }
305
306 return true;
307 }
308
309 // Cpu architecture string
310 #if defined(PPC32)
311 static char cpu_arch[] = "ppc";
312 #elif defined(PPC64)
313 static char cpu_arch[] = "ppc64";
314 #else
315 #error Add appropriate cpu_arch setting
316 #endif
317
318
319 // Given an address, returns the size of the page backing that address.
320 size_t os::Aix::query_pagesize(void* addr) {
321
322 vm_page_info pi;
323 pi.addr = (uint64_t)addr;
324 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
325 return pi.pagesize;
326 } else {
327 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
328 assert(false, "vmgetinfo failed to retrieve page size");
329 return SIZE_4K;
330 }
331
332 }
333
334 // Returns the kernel thread id of the currently running thread.
335 pid_t os::Aix::gettid() {
336 return (pid_t) thread_self();
337 }
338
339 void os::Aix::initialize_system_info() {
340
341 // Get the number of online(logical) cpus instead of configured.
342 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
343 assert(_processor_count > 0, "_processor_count must be > 0");
344
345 // Retrieve total physical storage.
346 os::Aix::meminfo_t mi;
347 if (!os::Aix::get_meminfo(&mi)) {
348 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
349 assert(false, "os::Aix::get_meminfo failed.");
350 }
351 _physical_memory = (julong) mi.real_total;
352 }
353
354 // Helper function for tracing page sizes.
355 static const char* describe_pagesize(size_t pagesize) {
356 switch (pagesize) {
357 case SIZE_4K : return "4K";
358 case SIZE_64K: return "64K";
359 case SIZE_16M: return "16M";
360 case SIZE_16G: return "16G";
361 default:
362 assert(false, "surprise");
363 return "??";
364 }
365 }
366
367 // Retrieve information about multipage size support. Will initialize
368 // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages,
369 // Aix::_can_use_16M_pages.
370 // Must be called before calling os::large_page_init().
371 void os::Aix::query_multipage_support() {
372
373 guarantee(_page_size == -1 &&
374 _stack_page_size == -1 &&
375 _can_use_64K_pages == -1 &&
376 _can_use_16M_pages == -1 &&
377 g_multipage_error == -1,
378 "do not call twice");
379
380 _page_size = ::sysconf(_SC_PAGESIZE);
381
382 // This really would surprise me.
383 assert(_page_size == SIZE_4K, "surprise!");
384
385
386 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
387 // Default data page size is influenced either by linker options (-bdatapsize)
388 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
389 // default should be 4K.
390 size_t data_page_size = SIZE_4K;
391 {
392 void* p = ::malloc(SIZE_16M);
393 guarantee(p != NULL, "malloc failed");
394 data_page_size = os::Aix::query_pagesize(p);
395 ::free(p);
396 }
397
398 // query default shm page size (LDR_CNTRL SHMPSIZE)
399 {
400 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
401 guarantee(shmid != -1, "shmget failed");
402 void* p = ::shmat(shmid, NULL, 0);
403 ::shmctl(shmid, IPC_RMID, NULL);
404 guarantee(p != (void*) -1, "shmat failed");
405 _shm_default_page_size = os::Aix::query_pagesize(p);
406 ::shmdt(p);
407 }
408
409 // before querying the stack page size, make sure we are not running as primordial
410 // thread (because primordial thread's stack may have different page size than
411 // pthread thread stacks). Running a VM on the primordial thread won't work for a
412 // number of reasons so we may just as well guarantee it here
413 guarantee(!os::is_primordial_thread(), "Must not be called for primordial thread");
414
415 // query stack page size
416 {
417 int dummy = 0;
418 _stack_page_size = os::Aix::query_pagesize(&dummy);
419 // everything else would surprise me and should be looked into
420 guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size");
421 // also, just for completeness: pthread stacks are allocated from C heap, so
422 // stack page size should be the same as data page size
423 guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size");
424 }
425
426 // EXTSHM is bad: among other things, it prevents setting pagesize dynamically
427 // for system V shm.
428 if (Aix::extshm()) {
429 if (Verbose) {
430 fprintf(stderr, "EXTSHM is active - will disable large page support.\n"
431 "Please make sure EXTSHM is OFF for large page support.\n");
432 }
433 g_multipage_error = ERROR_MP_EXTSHM_ACTIVE;
434 _can_use_64K_pages = _can_use_16M_pages = 0;
435 goto query_multipage_support_end;
436 }
437
438 // now check which page sizes the OS claims it supports, and of those, which actually can be used.
439 {
440 const int MAX_PAGE_SIZES = 4;
441 psize_t sizes[MAX_PAGE_SIZES];
442 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
443 if (num_psizes == -1) {
444 if (Verbose) {
445 fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
446 fprintf(stderr, "disabling multipage support.\n");
447 }
448 g_multipage_error = ERROR_MP_VMGETINFO_FAILED;
449 _can_use_64K_pages = _can_use_16M_pages = 0;
450 goto query_multipage_support_end;
451 }
452 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
453 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
454 if (Verbose) {
455 fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
456 for (int i = 0; i < num_psizes; i ++) {
457 fprintf(stderr, " %s ", describe_pagesize(sizes[i]));
458 }
459 fprintf(stderr, " .\n");
460 }
461
462 // Can we use 64K, 16M pages?
463 _can_use_64K_pages = 0;
464 _can_use_16M_pages = 0;
465 for (int i = 0; i < num_psizes; i ++) {
466 if (sizes[i] == SIZE_64K) {
467 _can_use_64K_pages = 1;
468 } else if (sizes[i] == SIZE_16M) {
469 _can_use_16M_pages = 1;
470 }
471 }
472
473 if (!_can_use_64K_pages) {
474 g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K;
475 }
476
477 // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages,
478 // there must be an actual 16M page pool, and we must run with enough rights.
479 if (_can_use_16M_pages) {
480 const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR);
481 guarantee(shmid != -1, "shmget failed");
482 struct shmid_ds shm_buf = { 0 };
483 shm_buf.shm_pagesize = SIZE_16M;
484 const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false;
485 const int en = errno;
486 ::shmctl(shmid, IPC_RMID, NULL);
487 if (!can_set_pagesize) {
488 if (Verbose) {
489 fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n"
490 "Will deactivate 16M support.\n", en, strerror(en));
491 }
492 _can_use_16M_pages = 0;
493 }
494 }
495
496 } // end: check which pages can be used for shared memory
497
498 query_multipage_support_end:
499
500 guarantee(_page_size != -1 &&
501 _stack_page_size != -1 &&
502 _can_use_64K_pages != -1 &&
503 _can_use_16M_pages != -1, "Page sizes not properly initialized");
504
505 if (_can_use_64K_pages) {
506 g_multipage_error = 0;
507 }
508
509 if (Verbose) {
510 fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size));
511 fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size));
512 fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size));
513 fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no"));
514 fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no"));
515 fprintf(stderr, "Multipage error details: %d\n", g_multipage_error);
516 }
517
518 } // end os::Aix::query_multipage_support()
519
520 void os::init_system_properties_values() {
521
522 #define DEFAULT_LIBPATH "/usr/lib:/lib"
523 #define EXTENSIONS_DIR "/lib/ext"
524 #define ENDORSED_DIR "/lib/endorsed"
525
526 // Buffer that fits several sprintfs.
527 // Note that the space for the trailing null is provided
528 // by the nulls included by the sizeof operator.
529 const size_t bufsize =
530 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
531 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR), // extensions dir
532 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
533 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
534
535 // sysclasspath, java_home, dll_dir
536 {
537 char *pslash;
538 os::jvm_path(buf, bufsize);
539
540 // Found the full path to libjvm.so.
541 // Now cut the path to <java_home>/jre if we can.
542 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
543 pslash = strrchr(buf, '/');
544 if (pslash != NULL) {
545 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
546 }
547 Arguments::set_dll_dir(buf);
548
549 if (pslash != NULL) {
550 pslash = strrchr(buf, '/');
551 if (pslash != NULL) {
552 *pslash = '\0'; // Get rid of /<arch>.
553 pslash = strrchr(buf, '/');
554 if (pslash != NULL) {
555 *pslash = '\0'; // Get rid of /lib.
556 }
557 }
558 }
559 Arguments::set_java_home(buf);
560 set_boot_path('/', ':');
561 }
562
563 // Where to look for native libraries.
564
565 // On Aix we get the user setting of LIBPATH.
566 // Eventually, all the library path setting will be done here.
567 // Get the user setting of LIBPATH.
568 const char *v = ::getenv("LIBPATH");
569 const char *v_colon = ":";
570 if (v == NULL) { v = ""; v_colon = ""; }
571
572 // Concatenate user and invariant part of ld_library_path.
573 // That's +1 for the colon and +1 for the trailing '\0'.
574 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
575 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
576 Arguments::set_library_path(ld_library_path);
577 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal);
578
579 // Extensions directories.
580 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
581 Arguments::set_ext_dirs(buf);
582
583 // Endorsed standards default directory.
584 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
585 Arguments::set_endorsed_dirs(buf);
586
587 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
588
589 #undef DEFAULT_LIBPATH
590 #undef EXTENSIONS_DIR
591 #undef ENDORSED_DIR
592 }
593
594 ////////////////////////////////////////////////////////////////////////////////
595 // breakpoint support
596
597 void os::breakpoint() {
598 BREAKPOINT;
599 }
600
601 extern "C" void breakpoint() {
602 // use debugger to set breakpoint here
603 }
604
605 ////////////////////////////////////////////////////////////////////////////////
606 // signal support
607
608 debug_only(static bool signal_sets_initialized = false);
609 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
610
611 bool os::Aix::is_sig_ignored(int sig) {
612 struct sigaction oact;
613 sigaction(sig, (struct sigaction*)NULL, &oact);
614 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
615 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
616 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
617 return true;
618 } else {
619 return false;
620 }
621 }
622
623 void os::Aix::signal_sets_init() {
624 // Should also have an assertion stating we are still single-threaded.
625 assert(!signal_sets_initialized, "Already initialized");
626 // Fill in signals that are necessarily unblocked for all threads in
627 // the VM. Currently, we unblock the following signals:
628 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
629 // by -Xrs (=ReduceSignalUsage));
630 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
631 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
632 // the dispositions or masks wrt these signals.
633 // Programs embedding the VM that want to use the above signals for their
634 // own purposes must, at this time, use the "-Xrs" option to prevent
635 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
636 // (See bug 4345157, and other related bugs).
637 // In reality, though, unblocking these signals is really a nop, since
638 // these signals are not blocked by default.
639 sigemptyset(&unblocked_sigs);
640 sigemptyset(&allowdebug_blocked_sigs);
641 sigaddset(&unblocked_sigs, SIGILL);
642 sigaddset(&unblocked_sigs, SIGSEGV);
643 sigaddset(&unblocked_sigs, SIGBUS);
644 sigaddset(&unblocked_sigs, SIGFPE);
645 sigaddset(&unblocked_sigs, SIGTRAP);
646 sigaddset(&unblocked_sigs, SIGDANGER);
647 sigaddset(&unblocked_sigs, SR_signum);
648
649 if (!ReduceSignalUsage) {
650 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
651 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
652 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
653 }
654 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
655 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
656 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
657 }
658 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
659 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
660 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
661 }
662 }
663 // Fill in signals that are blocked by all but the VM thread.
664 sigemptyset(&vm_sigs);
665 if (!ReduceSignalUsage)
666 sigaddset(&vm_sigs, BREAK_SIGNAL);
667 debug_only(signal_sets_initialized = true);
668 }
669
670 // These are signals that are unblocked while a thread is running Java.
671 // (For some reason, they get blocked by default.)
672 sigset_t* os::Aix::unblocked_signals() {
673 assert(signal_sets_initialized, "Not initialized");
674 return &unblocked_sigs;
675 }
676
677 // These are the signals that are blocked while a (non-VM) thread is
678 // running Java. Only the VM thread handles these signals.
679 sigset_t* os::Aix::vm_signals() {
680 assert(signal_sets_initialized, "Not initialized");
681 return &vm_sigs;
682 }
683
684 // These are signals that are blocked during cond_wait to allow debugger in
685 sigset_t* os::Aix::allowdebug_blocked_signals() {
686 assert(signal_sets_initialized, "Not initialized");
687 return &allowdebug_blocked_sigs;
688 }
689
690 void os::Aix::hotspot_sigmask(Thread* thread) {
691
692 //Save caller's signal mask before setting VM signal mask
693 sigset_t caller_sigmask;
694 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
695
696 OSThread* osthread = thread->osthread();
697 osthread->set_caller_sigmask(caller_sigmask);
698
699 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
700
701 if (!ReduceSignalUsage) {
702 if (thread->is_VM_thread()) {
703 // Only the VM thread handles BREAK_SIGNAL ...
704 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
705 } else {
706 // ... all other threads block BREAK_SIGNAL
707 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
708 }
709 }
710 }
711
712 // retrieve memory information.
713 // Returns false if something went wrong;
714 // content of pmi undefined in this case.
715 bool os::Aix::get_meminfo(meminfo_t* pmi) {
716
717 assert(pmi, "get_meminfo: invalid parameter");
718
719 memset(pmi, 0, sizeof(meminfo_t));
720
721 if (os::Aix::on_pase()) {
722
723 Unimplemented();
724 return false;
725
726 } else {
727
728 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
729 // See:
730 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
731 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
732 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
733 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
734
735 perfstat_memory_total_t psmt;
736 memset (&psmt, '\0', sizeof(psmt));
737 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
738 if (rc == -1) {
739 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
740 assert(0, "perfstat_memory_total() failed");
741 return false;
742 }
743
744 assert(rc == 1, "perfstat_memory_total() - weird return code");
745
746 // excerpt from
747 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
748 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
749 // The fields of perfstat_memory_total_t:
750 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
751 // u_longlong_t real_total Total real memory (in 4 KB pages).
752 // u_longlong_t real_free Free real memory (in 4 KB pages).
753 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
754 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
755
756 pmi->virt_total = psmt.virt_total * 4096;
757 pmi->real_total = psmt.real_total * 4096;
758 pmi->real_free = psmt.real_free * 4096;
759 pmi->pgsp_total = psmt.pgsp_total * 4096;
760 pmi->pgsp_free = psmt.pgsp_free * 4096;
761
762 return true;
763
764 }
765 } // end os::Aix::get_meminfo
766
767 // Retrieve global cpu information.
768 // Returns false if something went wrong;
769 // the content of pci is undefined in this case.
770 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
771 assert(pci, "get_cpuinfo: invalid parameter");
772 memset(pci, 0, sizeof(cpuinfo_t));
773
774 perfstat_cpu_total_t psct;
775 memset (&psct, '\0', sizeof(psct));
776
777 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
778 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
779 assert(0, "perfstat_cpu_total() failed");
780 return false;
781 }
782
783 // global cpu information
784 strcpy (pci->description, psct.description);
785 pci->processorHZ = psct.processorHZ;
786 pci->ncpus = psct.ncpus;
787 os::Aix::_logical_cpus = psct.ncpus;
788 for (int i = 0; i < 3; i++) {
789 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
790 }
791
792 // get the processor version from _system_configuration
793 switch (_system_configuration.version) {
794 case PV_8:
795 strcpy(pci->version, "Power PC 8");
796 break;
797 case PV_7:
798 strcpy(pci->version, "Power PC 7");
799 break;
800 case PV_6_1:
801 strcpy(pci->version, "Power PC 6 DD1.x");
802 break;
803 case PV_6:
804 strcpy(pci->version, "Power PC 6");
805 break;
806 case PV_5:
807 strcpy(pci->version, "Power PC 5");
808 break;
809 case PV_5_2:
810 strcpy(pci->version, "Power PC 5_2");
811 break;
812 case PV_5_3:
813 strcpy(pci->version, "Power PC 5_3");
814 break;
815 case PV_5_Compat:
816 strcpy(pci->version, "PV_5_Compat");
817 break;
818 case PV_6_Compat:
819 strcpy(pci->version, "PV_6_Compat");
820 break;
821 case PV_7_Compat:
822 strcpy(pci->version, "PV_7_Compat");
823 break;
824 case PV_8_Compat:
825 strcpy(pci->version, "PV_8_Compat");
826 break;
827 default:
828 strcpy(pci->version, "unknown");
829 }
830
831 return true;
832
833 } //end os::Aix::get_cpuinfo
834
835 //////////////////////////////////////////////////////////////////////////////
836 // detecting pthread library
837
838 void os::Aix::libpthread_init() {
839 return;
840 }
841
842 //////////////////////////////////////////////////////////////////////////////
843 // create new thread
844
845 // Thread start routine for all newly created threads
846 static void *java_start(Thread *thread) {
847
848 // find out my own stack dimensions
849 {
850 // actually, this should do exactly the same as thread->record_stack_base_and_size...
851 address base = 0;
852 size_t size = 0;
853 query_stack_dimensions(&base, &size);
854 thread->set_stack_base(base);
855 thread->set_stack_size(size);
856 }
857
858 // Do some sanity checks.
859 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
860
861 // Try to randomize the cache line index of hot stack frames.
862 // This helps when threads of the same stack traces evict each other's
863 // cache lines. The threads can be either from the same JVM instance, or
864 // from different JVM instances. The benefit is especially true for
865 // processors with hyperthreading technology.
866
867 static int counter = 0;
868 int pid = os::current_process_id();
869 alloca(((pid ^ counter++) & 7) * 128);
870
871 ThreadLocalStorage::set_thread(thread);
872
873 OSThread* osthread = thread->osthread();
874
875 // thread_id is kernel thread id (similar to Solaris LWP id)
876 osthread->set_thread_id(os::Aix::gettid());
877
878 // initialize signal mask for this thread
879 os::Aix::hotspot_sigmask(thread);
880
881 // initialize floating point control register
882 os::Aix::init_thread_fpu_state();
883
884 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
885
886 // call one more level start routine
887 thread->run();
888
889 return 0;
890 }
891
892 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
893
894 // We want the whole function to be synchronized.
895 ThreadCritical cs;
896
897 assert(thread->osthread() == NULL, "caller responsible");
898
899 // Allocate the OSThread object
900 OSThread* osthread = new OSThread(NULL, NULL);
901 if (osthread == NULL) {
902 return false;
903 }
904
905 // set the correct thread state
906 osthread->set_thread_type(thr_type);
907
908 // Initial state is ALLOCATED but not INITIALIZED
909 osthread->set_state(ALLOCATED);
910
911 thread->set_osthread(osthread);
912
913 // init thread attributes
914 pthread_attr_t attr;
915 pthread_attr_init(&attr);
916 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
917
918 // Make sure we run in 1:1 kernel-user-thread mode.
919 if (os::Aix::on_aix()) {
920 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
921 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
922 } // end: aix
923
924 // Start in suspended state, and in os::thread_start, wake the thread up.
925 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
926
927 // calculate stack size if it's not specified by caller
928 if (os::Aix::supports_variable_stack_size()) {
929 if (stack_size == 0) {
930 stack_size = os::Aix::default_stack_size(thr_type);
931
932 switch (thr_type) {
933 case os::java_thread:
934 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
935 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
936 stack_size = JavaThread::stack_size_at_create();
937 break;
938 case os::compiler_thread:
939 if (CompilerThreadStackSize > 0) {
940 stack_size = (size_t)(CompilerThreadStackSize * K);
941 break;
942 } // else fall through:
943 // use VMThreadStackSize if CompilerThreadStackSize is not defined
944 case os::vm_thread:
945 case os::pgc_thread:
946 case os::cgc_thread:
947 case os::watcher_thread:
948 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
949 break;
950 }
951 }
952
953 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
954 pthread_attr_setstacksize(&attr, stack_size);
955 } //else let thread_create() pick the default value (96 K on AIX)
956
957 pthread_t tid;
958 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
959
960 pthread_attr_destroy(&attr);
961
962 if (ret == 0) {
963 // PPC port traceOsMisc(("Created New Thread : pthread-id %u", tid));
964 } else {
965 if (PrintMiscellaneous && (Verbose || WizardMode)) {
966 perror("pthread_create()");
967 }
968 // Need to clean up stuff we've allocated so far
969 thread->set_osthread(NULL);
970 delete osthread;
971 return false;
972 }
973
974 // Store pthread info into the OSThread
975 osthread->set_pthread_id(tid);
976
977 return true;
978 }
979
980 /////////////////////////////////////////////////////////////////////////////
981 // attach existing thread
982
983 // bootstrap the main thread
984 bool os::create_main_thread(JavaThread* thread) {
985 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
986 return create_attached_thread(thread);
987 }
988
989 bool os::create_attached_thread(JavaThread* thread) {
990 #ifdef ASSERT
991 thread->verify_not_published();
992 #endif
993
994 // Allocate the OSThread object
995 OSThread* osthread = new OSThread(NULL, NULL);
996
997 if (osthread == NULL) {
998 return false;
999 }
1000
1001 // Store pthread info into the OSThread
1002 osthread->set_thread_id(os::Aix::gettid());
1003 osthread->set_pthread_id(::pthread_self());
1004
1005 // initialize floating point control register
1006 os::Aix::init_thread_fpu_state();
1007
1008 // some sanity checks
1009 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
1010
1011 // Initial thread state is RUNNABLE
1012 osthread->set_state(RUNNABLE);
1013
1014 thread->set_osthread(osthread);
1015
1016 if (UseNUMA) {
1017 int lgrp_id = os::numa_get_group_id();
1018 if (lgrp_id != -1) {
1019 thread->set_lgrp_id(lgrp_id);
1020 }
1021 }
1022
1023 // initialize signal mask for this thread
1024 // and save the caller's signal mask
1025 os::Aix::hotspot_sigmask(thread);
1026
1027 return true;
1028 }
1029
1030 void os::pd_start_thread(Thread* thread) {
1031 int status = pthread_continue_np(thread->osthread()->pthread_id());
1032 assert(status == 0, "thr_continue failed");
1033 }
1034
1035 // Free OS resources related to the OSThread
1036 void os::free_thread(OSThread* osthread) {
1037 assert(osthread != NULL, "osthread not set");
1038
1039 if (Thread::current()->osthread() == osthread) {
1040 // Restore caller's signal mask
1041 sigset_t sigmask = osthread->caller_sigmask();
1042 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1043 }
1044
1045 delete osthread;
1046 }
1047
1048 //////////////////////////////////////////////////////////////////////////////
1049 // thread local storage
1050
1051 int os::allocate_thread_local_storage() {
1052 pthread_key_t key;
1053 int rslt = pthread_key_create(&key, NULL);
1054 assert(rslt == 0, "cannot allocate thread local storage");
1055 return (int)key;
1056 }
1057
1058 // Note: This is currently not used by VM, as we don't destroy TLS key
1059 // on VM exit.
1060 void os::free_thread_local_storage(int index) {
1061 int rslt = pthread_key_delete((pthread_key_t)index);
1062 assert(rslt == 0, "invalid index");
1063 }
1064
1065 void os::thread_local_storage_at_put(int index, void* value) {
1066 int rslt = pthread_setspecific((pthread_key_t)index, value);
1067 assert(rslt == 0, "pthread_setspecific failed");
1068 }
1069
1070 extern "C" Thread* get_thread() {
1071 return ThreadLocalStorage::thread();
1072 }
1073
1074 ////////////////////////////////////////////////////////////////////////////////
1075 // time support
1076
1077 // Time since start-up in seconds to a fine granularity.
1078 // Used by VMSelfDestructTimer and the MemProfiler.
1079 double os::elapsedTime() {
1080 return (double)(os::elapsed_counter()) * 0.000001;
1081 }
1082
1083 jlong os::elapsed_counter() {
1084 timeval time;
1085 int status = gettimeofday(&time, NULL);
1086 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1087 }
1088
1089 jlong os::elapsed_frequency() {
1090 return (1000 * 1000);
1091 }
1092
1093 // For now, we say that linux does not support vtime. I have no idea
1094 // whether it can actually be made to (DLD, 9/13/05).
1095
1096 bool os::supports_vtime() { return false; }
1097 bool os::enable_vtime() { return false; }
1098 bool os::vtime_enabled() { return false; }
1099 double os::elapsedVTime() {
1100 // better than nothing, but not much
1101 return elapsedTime();
1102 }
1103
1104 jlong os::javaTimeMillis() {
1105 timeval time;
1106 int status = gettimeofday(&time, NULL);
1107 assert(status != -1, "aix error at gettimeofday()");
1108 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1109 }
1110
1111 // We need to manually declare mread_real_time,
1112 // because IBM didn't provide a prototype in time.h.
1113 // (they probably only ever tested in C, not C++)
1114 extern "C"
1115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1116
1117 jlong os::javaTimeNanos() {
1118 if (os::Aix::on_pase()) {
1119 Unimplemented();
1120 return 0;
1121 } else {
1122 // On AIX use the precision of processors real time clock
1123 // or time base registers.
1124 timebasestruct_t time;
1125 int rc;
1126
1127 // If the CPU has a time register, it will be used and
1128 // we have to convert to real time first. After convertion we have following data:
1129 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1130 // time.tb_low [nanoseconds after the last full second above]
1131 // We better use mread_real_time here instead of read_real_time
1132 // to ensure that we will get a monotonic increasing time.
1133 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1134 rc = time_base_to_time(&time, TIMEBASE_SZ);
1135 assert(rc != -1, "aix error at time_base_to_time()");
1136 }
1137 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1138 }
1139 }
1140
1141 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1142 {
1143 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
1144 info_ptr->max_value = ALL_64_BITS;
1145
1146 // gettimeofday is a real time clock so it skips
1147 info_ptr->may_skip_backward = true;
1148 info_ptr->may_skip_forward = true;
1149 }
1150
1151 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1152 }
1153
1154 // Return the real, user, and system times in seconds from an
1155 // arbitrary fixed point in the past.
1156 bool os::getTimesSecs(double* process_real_time,
1157 double* process_user_time,
1158 double* process_system_time) {
1159 struct tms ticks;
1160 clock_t real_ticks = times(&ticks);
1161
1162 if (real_ticks == (clock_t) (-1)) {
1163 return false;
1164 } else {
1165 double ticks_per_second = (double) clock_tics_per_sec;
1166 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1167 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1168 *process_real_time = ((double) real_ticks) / ticks_per_second;
1169
1170 return true;
1171 }
1172 }
1173
1174 char * os::local_time_string(char *buf, size_t buflen) {
1175 struct tm t;
1176 time_t long_time;
1177 time(&long_time);
1178 localtime_r(&long_time, &t);
1179 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1180 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1181 t.tm_hour, t.tm_min, t.tm_sec);
1182 return buf;
1183 }
1184
1185 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1186 return localtime_r(clock, res);
1187 }
1188
1189 ////////////////////////////////////////////////////////////////////////////////
1190 // runtime exit support
1191
1192 // Note: os::shutdown() might be called very early during initialization, or
1193 // called from signal handler. Before adding something to os::shutdown(), make
1194 // sure it is async-safe and can handle partially initialized VM.
1195 void os::shutdown() {
1196
1197 // allow PerfMemory to attempt cleanup of any persistent resources
1198 perfMemory_exit();
1199
1200 // needs to remove object in file system
1201 AttachListener::abort();
1202
1203 // flush buffered output, finish log files
1204 ostream_abort();
1205
1206 // Check for abort hook
1207 abort_hook_t abort_hook = Arguments::abort_hook();
1208 if (abort_hook != NULL) {
1209 abort_hook();
1210 }
1211 }
1212
1213 // Note: os::abort() might be called very early during initialization, or
1214 // called from signal handler. Before adding something to os::abort(), make
1215 // sure it is async-safe and can handle partially initialized VM.
1216 void os::abort(bool dump_core) {
1217 os::shutdown();
1218 if (dump_core) {
1219 #ifndef PRODUCT
1220 fdStream out(defaultStream::output_fd());
1221 out.print_raw("Current thread is ");
1222 char buf[16];
1223 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1224 out.print_raw_cr(buf);
1225 out.print_raw_cr("Dumping core ...");
1226 #endif
1227 ::abort(); // dump core
1228 }
1229
1230 ::exit(1);
1231 }
1232
1233 // Die immediately, no exit hook, no abort hook, no cleanup.
1234 void os::die() {
1235 ::abort();
1236 }
1237
1238 // This method is a copy of JDK's sysGetLastErrorString
1239 // from src/solaris/hpi/src/system_md.c
1240
1241 size_t os::lasterror(char *buf, size_t len) {
1242 if (errno == 0) return 0;
1243
1244 const char *s = ::strerror(errno);
1245 size_t n = ::strlen(s);
1246 if (n >= len) {
1247 n = len - 1;
1248 }
1249 ::strncpy(buf, s, n);
1250 buf[n] = '\0';
1251 return n;
1252 }
1253
1254 intx os::current_thread_id() { return (intx)pthread_self(); }
1255
1256 int os::current_process_id() {
1257
1258 // This implementation returns a unique pid, the pid of the
1259 // launcher thread that starts the vm 'process'.
1260
1261 // Under POSIX, getpid() returns the same pid as the
1262 // launcher thread rather than a unique pid per thread.
1263 // Use gettid() if you want the old pre NPTL behaviour.
1264
1265 // if you are looking for the result of a call to getpid() that
1266 // returns a unique pid for the calling thread, then look at the
1267 // OSThread::thread_id() method in osThread_linux.hpp file
1268
1269 return (int)(_initial_pid ? _initial_pid : getpid());
1270 }
1271
1272 // DLL functions
1273
1274 const char* os::dll_file_extension() { return ".so"; }
1275
1276 // This must be hard coded because it's the system's temporary
1277 // directory not the java application's temp directory, ala java.io.tmpdir.
1278 const char* os::get_temp_directory() { return "/tmp"; }
1279
1280 static bool file_exists(const char* filename) {
1281 struct stat statbuf;
1282 if (filename == NULL || strlen(filename) == 0) {
1283 return false;
1284 }
1285 return os::stat(filename, &statbuf) == 0;
1286 }
1287
1288 bool os::dll_build_name(char* buffer, size_t buflen,
1289 const char* pname, const char* fname) {
1290 bool retval = false;
1291 // Copied from libhpi
1292 const size_t pnamelen = pname ? strlen(pname) : 0;
1293
1294 // Return error on buffer overflow.
1295 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1296 *buffer = '\0';
1297 return retval;
1298 }
1299
1300 if (pnamelen == 0) {
1301 snprintf(buffer, buflen, "lib%s.so", fname);
1302 retval = true;
1303 } else if (strchr(pname, *os::path_separator()) != NULL) {
1304 int n;
1305 char** pelements = split_path(pname, &n);
1306 for (int i = 0; i < n; i++) {
1307 // Really shouldn't be NULL, but check can't hurt
1308 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1309 continue; // skip the empty path values
1310 }
1311 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1312 if (file_exists(buffer)) {
1313 retval = true;
1314 break;
1315 }
1316 }
1317 // release the storage
1318 for (int i = 0; i < n; i++) {
1319 if (pelements[i] != NULL) {
1320 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1321 }
1322 }
1323 if (pelements != NULL) {
1324 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1325 }
1326 } else {
1327 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1328 retval = true;
1329 }
1330 return retval;
1331 }
1332
1333 // Check if addr is inside libjvm.so.
1334 bool os::address_is_in_vm(address addr) {
1335
1336 // Input could be a real pc or a function pointer literal. The latter
1337 // would be a function descriptor residing in the data segment of a module.
1338
1339 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1340 if (lib) {
1341 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1342 return true;
1343 } else {
1344 return false;
1345 }
1346 } else {
1347 lib = LoadedLibraries::find_for_data_address(addr);
1348 if (lib) {
1349 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1350 return true;
1351 } else {
1352 return false;
1353 }
1354 } else {
1355 return false;
1356 }
1357 }
1358 }
1359
1360 // Resolve an AIX function descriptor literal to a code pointer.
1361 // If the input is a valid code pointer to a text segment of a loaded module,
1362 // it is returned unchanged.
1363 // If the input is a valid AIX function descriptor, it is resolved to the
1364 // code entry point.
1365 // If the input is neither a valid function descriptor nor a valid code pointer,
1366 // NULL is returned.
1367 static address resolve_function_descriptor_to_code_pointer(address p) {
1368
1369 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1370 if (lib) {
1371 // its a real code pointer
1372 return p;
1373 } else {
1374 lib = LoadedLibraries::find_for_data_address(p);
1375 if (lib) {
1376 // pointer to data segment, potential function descriptor
1377 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1378 if (LoadedLibraries::find_for_text_address(code_entry)) {
1379 // Its a function descriptor
1380 return code_entry;
1381 }
1382 }
1383 }
1384 return NULL;
1385 }
1386
1387 bool os::dll_address_to_function_name(address addr, char *buf,
1388 int buflen, int *offset) {
1389 if (offset) {
1390 *offset = -1;
1391 }
1392 // Buf is not optional, but offset is optional.
1393 assert(buf != NULL, "sanity check");
1394 buf[0] = '\0';
1395
1396 // Resolve function ptr literals first.
1397 addr = resolve_function_descriptor_to_code_pointer(addr);
1398 if (!addr) {
1399 return false;
1400 }
1401
1402 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1403 return Decoder::decode(addr, buf, buflen, offset);
1404 }
1405
1406 static int getModuleName(codeptr_t pc, // [in] program counter
1407 char* p_name, size_t namelen, // [out] optional: function name
1408 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1409 ) {
1410
1411 // initialize output parameters
1412 if (p_name && namelen > 0) {
1413 *p_name = '\0';
1414 }
1415 if (p_errmsg && errmsglen > 0) {
1416 *p_errmsg = '\0';
1417 }
1418
1419 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1420 if (lib) {
1421 if (p_name && namelen > 0) {
1422 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1423 }
1424 return 0;
1425 }
1426
1427 trcVerbose("pc outside any module");
1428
1429 return -1;
1430 }
1431
1432 bool os::dll_address_to_library_name(address addr, char* buf,
1433 int buflen, int* offset) {
1434 if (offset) {
1435 *offset = -1;
1436 }
1437 // Buf is not optional, but offset is optional.
1438 assert(buf != NULL, "sanity check");
1439 buf[0] = '\0';
1440
1441 // Resolve function ptr literals first.
1442 addr = resolve_function_descriptor_to_code_pointer(addr);
1443 if (!addr) {
1444 return false;
1445 }
1446
1447 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1448 return true;
1449 }
1450 return false;
1451 }
1452
1453 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1454 // for the same architecture as Hotspot is running on.
1455 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1456
1457 if (ebuf && ebuflen > 0) {
1458 ebuf[0] = '\0';
1459 ebuf[ebuflen - 1] = '\0';
1460 }
1461
1462 if (!filename || strlen(filename) == 0) {
1463 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1464 return NULL;
1465 }
1466
1467 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1468 void * result= ::dlopen(filename, RTLD_LAZY);
1469 if (result != NULL) {
1470 // Reload dll cache. Don't do this in signal handling.
1471 LoadedLibraries::reload();
1472 return result;
1473 } else {
1474 // error analysis when dlopen fails
1475 const char* const error_report = ::dlerror();
1476 if (error_report && ebuf && ebuflen > 0) {
1477 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1478 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1479 }
1480 }
1481 return NULL;
1482 }
1483
1484 // Glibc-2.0 libdl is not MT safe. If you are building with any glibc,
1485 // chances are you might want to run the generated bits against glibc-2.0
1486 // libdl.so, so always use locking for any version of glibc.
1487 void* os::dll_lookup(void* handle, const char* name) {
1488 pthread_mutex_lock(&dl_mutex);
1489 void* res = dlsym(handle, name);
1490 pthread_mutex_unlock(&dl_mutex);
1491 return res;
1492 }
1493
1494 void* os::get_default_process_handle() {
1495 return (void*)::dlopen(NULL, RTLD_LAZY);
1496 }
1497
1498 void os::print_dll_info(outputStream *st) {
1499 st->print_cr("Dynamic libraries:");
1500 LoadedLibraries::print(st);
1501 }
1502
1503 void os::print_os_info(outputStream* st) {
1504 st->print("OS:");
1505
1506 st->print("uname:");
1507 struct utsname name;
1508 uname(&name);
1509 st->print(name.sysname); st->print(" ");
1510 st->print(name.nodename); st->print(" ");
1511 st->print(name.release); st->print(" ");
1512 st->print(name.version); st->print(" ");
1513 st->print(name.machine);
1514 st->cr();
1515
1516 // rlimit
1517 st->print("rlimit:");
1518 struct rlimit rlim;
1519
1520 st->print(" STACK ");
1521 getrlimit(RLIMIT_STACK, &rlim);
1522 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1523 else st->print("%uk", rlim.rlim_cur >> 10);
1524
1525 st->print(", CORE ");
1526 getrlimit(RLIMIT_CORE, &rlim);
1527 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1528 else st->print("%uk", rlim.rlim_cur >> 10);
1529
1530 st->print(", NPROC ");
1531 st->print("%d", sysconf(_SC_CHILD_MAX));
1532
1533 st->print(", NOFILE ");
1534 getrlimit(RLIMIT_NOFILE, &rlim);
1535 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1536 else st->print("%d", rlim.rlim_cur);
1537
1538 st->print(", AS ");
1539 getrlimit(RLIMIT_AS, &rlim);
1540 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1541 else st->print("%uk", rlim.rlim_cur >> 10);
1542
1543 // Print limits on DATA, because it limits the C-heap.
1544 st->print(", DATA ");
1545 getrlimit(RLIMIT_DATA, &rlim);
1546 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1547 else st->print("%uk", rlim.rlim_cur >> 10);
1548 st->cr();
1549
1550 // load average
1551 st->print("load average:");
1552 double loadavg[3] = {-1.L, -1.L, -1.L};
1553 os::loadavg(loadavg, 3);
1554 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1555 st->cr();
1556 }
1557
1558 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1559 // Not yet implemented.
1560 return 0;
1561 }
1562
1563 void os::print_memory_info(outputStream* st) {
1564
1565 st->print_cr("Memory:");
1566
1567 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1568 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1569 st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size()));
1570 st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no"));
1571 st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no"));
1572 if (g_multipage_error != 0) {
1573 st->print_cr(" multipage error: %d", g_multipage_error);
1574 }
1575
1576 // print out LDR_CNTRL because it affects the default page sizes
1577 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1578 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1579
1580 const char* const extshm = ::getenv("EXTSHM");
1581 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1582
1583 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1584 os::Aix::meminfo_t mi;
1585 if (os::Aix::get_meminfo(&mi)) {
1586 char buffer[256];
1587 if (os::Aix::on_aix()) {
1588 jio_snprintf(buffer, sizeof(buffer),
1589 " physical total : %llu\n"
1590 " physical free : %llu\n"
1591 " swap total : %llu\n"
1592 " swap free : %llu\n",
1593 mi.real_total,
1594 mi.real_free,
1595 mi.pgsp_total,
1596 mi.pgsp_free);
1597 } else {
1598 Unimplemented();
1599 }
1600 st->print_raw(buffer);
1601 } else {
1602 st->print_cr(" (no more information available)");
1603 }
1604 }
1605
1606 void os::pd_print_cpu_info(outputStream* st) {
1607 // cpu
1608 st->print("CPU:");
1609 st->print("total %d", os::processor_count());
1610 // It's not safe to query number of active processors after crash
1611 // st->print("(active %d)", os::active_processor_count());
1612 st->print(" %s", VM_Version::cpu_features());
1613 st->cr();
1614 }
1615
1616 void os::print_siginfo(outputStream* st, void* siginfo) {
1617 // Use common posix version.
1618 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1619 st->cr();
1620 }
1621
1622 static void print_signal_handler(outputStream* st, int sig,
1623 char* buf, size_t buflen);
1624
1625 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1626 st->print_cr("Signal Handlers:");
1627 print_signal_handler(st, SIGSEGV, buf, buflen);
1628 print_signal_handler(st, SIGBUS , buf, buflen);
1629 print_signal_handler(st, SIGFPE , buf, buflen);
1630 print_signal_handler(st, SIGPIPE, buf, buflen);
1631 print_signal_handler(st, SIGXFSZ, buf, buflen);
1632 print_signal_handler(st, SIGILL , buf, buflen);
1633 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1634 print_signal_handler(st, SR_signum, buf, buflen);
1635 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1636 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1637 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1638 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1639 print_signal_handler(st, SIGTRAP, buf, buflen);
1640 print_signal_handler(st, SIGDANGER, buf, buflen);
1641 }
1642
1643 static char saved_jvm_path[MAXPATHLEN] = {0};
1644
1645 // Find the full path to the current module, libjvm.so.
1646 void os::jvm_path(char *buf, jint buflen) {
1647 // Error checking.
1648 if (buflen < MAXPATHLEN) {
1649 assert(false, "must use a large-enough buffer");
1650 buf[0] = '\0';
1651 return;
1652 }
1653 // Lazy resolve the path to current module.
1654 if (saved_jvm_path[0] != 0) {
1655 strcpy(buf, saved_jvm_path);
1656 return;
1657 }
1658
1659 Dl_info dlinfo;
1660 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1661 assert(ret != 0, "cannot locate libjvm");
1662 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1663 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1664
1665 strcpy(saved_jvm_path, buf);
1666 }
1667
1668 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1669 // no prefix required, not even "_"
1670 }
1671
1672 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1673 // no suffix required
1674 }
1675
1676 ////////////////////////////////////////////////////////////////////////////////
1677 // sun.misc.Signal support
1678
1679 static volatile jint sigint_count = 0;
1680
1681 static void
1682 UserHandler(int sig, void *siginfo, void *context) {
1683 // 4511530 - sem_post is serialized and handled by the manager thread. When
1684 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1685 // don't want to flood the manager thread with sem_post requests.
1686 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1687 return;
1688
1689 // Ctrl-C is pressed during error reporting, likely because the error
1690 // handler fails to abort. Let VM die immediately.
1691 if (sig == SIGINT && is_error_reported()) {
1692 os::die();
1693 }
1694
1695 os::signal_notify(sig);
1696 }
1697
1698 void* os::user_handler() {
1699 return CAST_FROM_FN_PTR(void*, UserHandler);
1700 }
1701
1702 extern "C" {
1703 typedef void (*sa_handler_t)(int);
1704 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1705 }
1706
1707 void* os::signal(int signal_number, void* handler) {
1708 struct sigaction sigAct, oldSigAct;
1709
1710 sigfillset(&(sigAct.sa_mask));
1711
1712 // Do not block out synchronous signals in the signal handler.
1713 // Blocking synchronous signals only makes sense if you can really
1714 // be sure that those signals won't happen during signal handling,
1715 // when the blocking applies. Normal signal handlers are lean and
1716 // do not cause signals. But our signal handlers tend to be "risky"
1717 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1718 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1719 // by a SIGILL, which was blocked due to the signal mask. The process
1720 // just hung forever. Better to crash from a secondary signal than to hang.
1721 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1722 sigdelset(&(sigAct.sa_mask), SIGBUS);
1723 sigdelset(&(sigAct.sa_mask), SIGILL);
1724 sigdelset(&(sigAct.sa_mask), SIGFPE);
1725 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1726
1727 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1728
1729 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1730
1731 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1732 // -1 means registration failed
1733 return (void *)-1;
1734 }
1735
1736 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1737 }
1738
1739 void os::signal_raise(int signal_number) {
1740 ::raise(signal_number);
1741 }
1742
1743 //
1744 // The following code is moved from os.cpp for making this
1745 // code platform specific, which it is by its very nature.
1746 //
1747
1748 // Will be modified when max signal is changed to be dynamic
1749 int os::sigexitnum_pd() {
1750 return NSIG;
1751 }
1752
1753 // a counter for each possible signal value
1754 static volatile jint pending_signals[NSIG+1] = { 0 };
1755
1756 // Linux(POSIX) specific hand shaking semaphore.
1757 static sem_t sig_sem;
1758
1759 void os::signal_init_pd() {
1760 // Initialize signal structures
1761 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1762
1763 // Initialize signal semaphore
1764 int rc = ::sem_init(&sig_sem, 0, 0);
1765 guarantee(rc != -1, "sem_init failed");
1766 }
1767
1768 void os::signal_notify(int sig) {
1769 Atomic::inc(&pending_signals[sig]);
1770 ::sem_post(&sig_sem);
1771 }
1772
1773 static int check_pending_signals(bool wait) {
1774 Atomic::store(0, &sigint_count);
1775 for (;;) {
1776 for (int i = 0; i < NSIG + 1; i++) {
1777 jint n = pending_signals[i];
1778 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1779 return i;
1780 }
1781 }
1782 if (!wait) {
1783 return -1;
1784 }
1785 JavaThread *thread = JavaThread::current();
1786 ThreadBlockInVM tbivm(thread);
1787
1788 bool threadIsSuspended;
1789 do {
1790 thread->set_suspend_equivalent();
1791 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1792
1793 ::sem_wait(&sig_sem);
1794
1795 // were we externally suspended while we were waiting?
1796 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1797 if (threadIsSuspended) {
1798 //
1799 // The semaphore has been incremented, but while we were waiting
1800 // another thread suspended us. We don't want to continue running
1801 // while suspended because that would surprise the thread that
1802 // suspended us.
1803 //
1804 ::sem_post(&sig_sem);
1805
1806 thread->java_suspend_self();
1807 }
1808 } while (threadIsSuspended);
1809 }
1810 }
1811
1812 int os::signal_lookup() {
1813 return check_pending_signals(false);
1814 }
1815
1816 int os::signal_wait() {
1817 return check_pending_signals(true);
1818 }
1819
1820 ////////////////////////////////////////////////////////////////////////////////
1821 // Virtual Memory
1822
1823 // AddrRange describes an immutable address range
1824 //
1825 // This is a helper class for the 'shared memory bookkeeping' below.
1826 class AddrRange {
1827 friend class ShmBkBlock;
1828
1829 char* _start;
1830 size_t _size;
1831
1832 public:
1833
1834 AddrRange(char* start, size_t size)
1835 : _start(start), _size(size)
1836 {}
1837
1838 AddrRange(const AddrRange& r)
1839 : _start(r.start()), _size(r.size())
1840 {}
1841
1842 char* start() const { return _start; }
1843 size_t size() const { return _size; }
1844 char* end() const { return _start + _size; }
1845 bool is_empty() const { return _size == 0 ? true : false; }
1846
1847 static AddrRange empty_range() { return AddrRange(NULL, 0); }
1848
1849 bool contains(const char* p) const {
1850 return start() <= p && end() > p;
1851 }
1852
1853 bool contains(const AddrRange& range) const {
1854 return start() <= range.start() && end() >= range.end();
1855 }
1856
1857 bool intersects(const AddrRange& range) const {
1858 return (range.start() <= start() && range.end() > start()) ||
1859 (range.start() < end() && range.end() >= end()) ||
1860 contains(range);
1861 }
1862
1863 bool is_same_range(const AddrRange& range) const {
1864 return start() == range.start() && size() == range.size();
1865 }
1866
1867 // return the closest inside range consisting of whole pages
1868 AddrRange find_closest_aligned_range(size_t pagesize) const {
1869 if (pagesize == 0 || is_empty()) {
1870 return empty_range();
1871 }
1872 char* const from = (char*)align_size_up((intptr_t)_start, pagesize);
1873 char* const to = (char*)align_size_down((intptr_t)end(), pagesize);
1874 if (from > to) {
1875 return empty_range();
1876 }
1877 return AddrRange(from, to - from);
1878 }
1879 };
1880
1881 ////////////////////////////////////////////////////////////////////////////
1882 // shared memory bookkeeping
1883 //
1884 // the os::reserve_memory() API and friends hand out different kind of memory, depending
1885 // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat.
1886 //
1887 // But these memory types have to be treated differently. For example, to uncommit
1888 // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory,
1889 // disclaim64() is needed.
1890 //
1891 // Therefore we need to keep track of the allocated memory segments and their
1892 // properties.
1893
1894 // ShmBkBlock: base class for all blocks in the shared memory bookkeeping
1895 class ShmBkBlock {
1896
1897 ShmBkBlock* _next;
1898
1899 protected:
1900
1901 AddrRange _range;
1902 const size_t _pagesize;
1903 const bool _pinned;
1904
1905 public:
1906
1907 ShmBkBlock(AddrRange range, size_t pagesize, bool pinned)
1908 : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) {
1909
1910 assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size");
1911 assert(!_range.is_empty(), "invalid range");
1912 }
1913
1914 virtual void print(outputStream* st) const {
1915 st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s",
1916 _range.start(), _range.end(), _range.size(),
1917 _range.size() / _pagesize, describe_pagesize(_pagesize),
1918 _pinned ? "pinned" : "");
1919 }
1920
1921 enum Type { MMAP, SHMAT };
1922 virtual Type getType() = 0;
1923
1924 char* base() const { return _range.start(); }
1925 size_t size() const { return _range.size(); }
1926
1927 void setAddrRange(AddrRange range) {
1928 _range = range;
1929 }
1930
1931 bool containsAddress(const char* p) const {
1932 return _range.contains(p);
1933 }
1934
1935 bool containsRange(const char* p, size_t size) const {
1936 return _range.contains(AddrRange((char*)p, size));
1937 }
1938
1939 bool isSameRange(const char* p, size_t size) const {
1940 return _range.is_same_range(AddrRange((char*)p, size));
1941 }
1942
1943 virtual bool disclaim(char* p, size_t size) = 0;
1944 virtual bool release() = 0;
1945
1946 // blocks live in a list.
1947 ShmBkBlock* next() const { return _next; }
1948 void set_next(ShmBkBlock* blk) { _next = blk; }
1949
1950 }; // end: ShmBkBlock
1951
1952
1953 // ShmBkMappedBlock: describes an block allocated with mmap()
1954 class ShmBkMappedBlock : public ShmBkBlock {
1955 public:
1956
1957 ShmBkMappedBlock(AddrRange range)
1958 : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned
1959
1960 void print(outputStream* st) const {
1961 ShmBkBlock::print(st);
1962 st->print_cr(" - mmap'ed");
1963 }
1964
1965 Type getType() {
1966 return MMAP;
1967 }
1968
1969 bool disclaim(char* p, size_t size) {
1970
1971 AddrRange r(p, size);
1972
1973 guarantee(_range.contains(r), "invalid disclaim");
1974
1975 // only disclaim whole ranges.
1976 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
1977 if (r2.is_empty()) {
1978 return true;
1979 }
1980
1981 const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE);
1982
1983 if (rc != 0) {
1984 warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno);
1985 }
1986
1987 return rc == 0 ? true : false;
1988 }
1989
1990 bool release() {
1991 // mmap'ed blocks are released using munmap
1992 if (::munmap(_range.start(), _range.size()) != 0) {
1993 warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno);
1994 return false;
1995 }
1996 return true;
1997 }
1998 }; // end: ShmBkMappedBlock
1999
2000 // ShmBkShmatedBlock: describes an block allocated with shmget/shmat()
2001 class ShmBkShmatedBlock : public ShmBkBlock {
2002 public:
2003
2004 ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned)
2005 : ShmBkBlock(range, pagesize, pinned) {}
2006
2007 void print(outputStream* st) const {
2008 ShmBkBlock::print(st);
2009 st->print_cr(" - shmat'ed");
2010 }
2011
2012 Type getType() {
2013 return SHMAT;
2014 }
2015
2016 bool disclaim(char* p, size_t size) {
2017
2018 AddrRange r(p, size);
2019
2020 if (_pinned) {
2021 return true;
2022 }
2023
2024 // shmat'ed blocks are disclaimed using disclaim64
2025 guarantee(_range.contains(r), "invalid disclaim");
2026
2027 // only disclaim whole ranges.
2028 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
2029 if (r2.is_empty()) {
2030 return true;
2031 }
2032
2033 const bool rc = my_disclaim64(r2.start(), r2.size());
2034
2035 if (Verbose && !rc) {
2036 warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end());
2037 }
2038
2039 return rc;
2040 }
2041
2042 bool release() {
2043 bool rc = false;
2044 if (::shmdt(_range.start()) != 0) {
2045 warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno);
2046 } else {
2047 rc = true;
2048 }
2049 return rc;
2050 }
2051
2052 }; // end: ShmBkShmatedBlock
2053
2054 static ShmBkBlock* g_shmbk_list = NULL;
2055 static volatile jint g_shmbk_table_lock = 0;
2056
2057 // keep some usage statistics
2058 static struct {
2059 int nodes; // number of nodes in list
2060 size_t bytes; // reserved - not committed - bytes.
2061 int reserves; // how often reserve was called
2062 int lookups; // how often a lookup was made
2063 } g_shmbk_stats = { 0, 0, 0, 0 };
2064
2065 // add information about a shared memory segment to the bookkeeping
2066 static void shmbk_register(ShmBkBlock* p_block) {
2067 guarantee(p_block, "logic error");
2068 p_block->set_next(g_shmbk_list);
2069 g_shmbk_list = p_block;
2070 g_shmbk_stats.reserves ++;
2071 g_shmbk_stats.bytes += p_block->size();
2072 g_shmbk_stats.nodes ++;
2073 }
2074
2075 // remove information about a shared memory segment by its starting address
2076 static void shmbk_unregister(ShmBkBlock* p_block) {
2077 ShmBkBlock* p = g_shmbk_list;
2078 ShmBkBlock* prev = NULL;
2079 while (p) {
2080 if (p == p_block) {
2081 if (prev) {
2082 prev->set_next(p->next());
2083 } else {
2084 g_shmbk_list = p->next();
2085 }
2086 g_shmbk_stats.nodes --;
2087 g_shmbk_stats.bytes -= p->size();
2088 return;
2089 }
2090 prev = p;
2091 p = p->next();
2092 }
2093 assert(false, "should not happen");
2094 }
2095
2096 // given a pointer, return shared memory bookkeeping record for the segment it points into
2097 // using the returned block info must happen under lock protection
2098 static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) {
2099 g_shmbk_stats.lookups ++;
2100 ShmBkBlock* p = g_shmbk_list;
2101 while (p) {
2102 if (p->containsAddress(addr)) {
2103 return p;
2104 }
2105 p = p->next();
2106 }
2107 return NULL;
2108 }
2109
2110 // dump all information about all memory segments allocated with os::reserve_memory()
2111 void shmbk_dump_info() {
2112 tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, "
2113 "total reserves: %d total lookups: %d)",
2114 g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups);
2115 const ShmBkBlock* p = g_shmbk_list;
2116 int i = 0;
2117 while (p) {
2118 p->print(tty);
2119 p = p->next();
2120 i ++;
2121 }
2122 }
2123
2124 #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK;
2125 #define UNLOCK_SHMBK }
2126
2127 // End: shared memory bookkeeping
2128 ////////////////////////////////////////////////////////////////////////////////////////////////////
2129
2130 int os::vm_page_size() {
2131 // Seems redundant as all get out
2132 assert(os::Aix::page_size() != -1, "must call os::init");
2133 return os::Aix::page_size();
2134 }
2135
2136 // Aix allocates memory by pages.
2137 int os::vm_allocation_granularity() {
2138 assert(os::Aix::page_size() != -1, "must call os::init");
2139 return os::Aix::page_size();
2140 }
2141
2142 int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) {
2143
2144 // Commit is a noop. There is no explicit commit
2145 // needed on AIX. Memory is committed when touched.
2146 //
2147 // Debug : check address range for validity
2148 #ifdef ASSERT
2149 LOCK_SHMBK
2150 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2151 if (!block) {
2152 fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr);
2153 shmbk_dump_info();
2154 assert(false, "invalid pointer");
2155 return false;
2156 } else if (!block->containsRange(addr, size)) {
2157 fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size);
2158 shmbk_dump_info();
2159 assert(false, "invalid range");
2160 return false;
2161 }
2162 UNLOCK_SHMBK
2163 #endif // ASSERT
2164
2165 return 0;
2166 }
2167
2168 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2169 return os::Aix::commit_memory_impl(addr, size, exec) == 0;
2170 }
2171
2172 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2173 const char* mesg) {
2174 assert(mesg != NULL, "mesg must be specified");
2175 os::Aix::commit_memory_impl(addr, size, exec);
2176 }
2177
2178 int os::Aix::commit_memory_impl(char* addr, size_t size,
2179 size_t alignment_hint, bool exec) {
2180 return os::Aix::commit_memory_impl(addr, size, exec);
2181 }
2182
2183 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2184 bool exec) {
2185 return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0;
2186 }
2187
2188 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2189 size_t alignment_hint, bool exec,
2190 const char* mesg) {
2191 os::Aix::commit_memory_impl(addr, size, alignment_hint, exec);
2192 }
2193
2194 bool os::pd_uncommit_memory(char* addr, size_t size) {
2195
2196 // Delegate to ShmBkBlock class which knows how to uncommit its memory.
2197
2198 bool rc = false;
2199 LOCK_SHMBK
2200 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2201 if (!block) {
2202 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2203 shmbk_dump_info();
2204 assert(false, "invalid pointer");
2205 return false;
2206 } else if (!block->containsRange(addr, size)) {
2207 fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size);
2208 shmbk_dump_info();
2209 assert(false, "invalid range");
2210 return false;
2211 }
2212 rc = block->disclaim(addr, size);
2213 UNLOCK_SHMBK
2214
2215 if (Verbose && !rc) {
2216 warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size);
2217 }
2218 return rc;
2219 }
2220
2221 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2222 return os::guard_memory(addr, size);
2223 }
2224
2225 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2226 return os::unguard_memory(addr, size);
2227 }
2228
2229 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2230 }
2231
2232 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2233 }
2234
2235 void os::numa_make_global(char *addr, size_t bytes) {
2236 }
2237
2238 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2239 }
2240
2241 bool os::numa_topology_changed() {
2242 return false;
2243 }
2244
2245 size_t os::numa_get_groups_num() {
2246 return 1;
2247 }
2248
2249 int os::numa_get_group_id() {
2250 return 0;
2251 }
2252
2253 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2254 if (size > 0) {
2255 ids[0] = 0;
2256 return 1;
2257 }
2258 return 0;
2259 }
2260
2261 bool os::get_page_info(char *start, page_info* info) {
2262 return false;
2263 }
2264
2265 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2266 return end;
2267 }
2268
2269 // Flags for reserve_shmatted_memory:
2270 #define RESSHM_WISHADDR_OR_FAIL 1
2271 #define RESSHM_TRY_16M_PAGES 2
2272 #define RESSHM_16M_PAGES_OR_FAIL 4
2273
2274 // Result of reserve_shmatted_memory:
2275 struct shmatted_memory_info_t {
2276 char* addr;
2277 size_t pagesize;
2278 bool pinned;
2279 };
2280
2281 // Reserve a section of shmatted memory.
2282 // params:
2283 // bytes [in]: size of memory, in bytes
2284 // requested_addr [in]: wish address.
2285 // NULL = no wish.
2286 // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot
2287 // be obtained, function will fail. Otherwise wish address is treated as hint and
2288 // another pointer is returned.
2289 // flags [in]: some flags. Valid flags are:
2290 // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained.
2291 // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool
2292 // (requires UseLargePages and Use16MPages)
2293 // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail.
2294 // Otherwise any other page size will do.
2295 // p_info [out] : holds information about the created shared memory segment.
2296 static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) {
2297
2298 assert(p_info, "parameter error");
2299
2300 // init output struct.
2301 p_info->addr = NULL;
2302
2303 // neither should we be here for EXTSHM=ON.
2304 if (os::Aix::extshm()) {
2305 ShouldNotReachHere();
2306 }
2307
2308 // extract flags. sanity checks.
2309 const bool wishaddr_or_fail =
2310 flags & RESSHM_WISHADDR_OR_FAIL;
2311 const bool try_16M_pages =
2312 flags & RESSHM_TRY_16M_PAGES;
2313 const bool f16M_pages_or_fail =
2314 flags & RESSHM_16M_PAGES_OR_FAIL;
2315
2316 // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary,
2317 // shmat will fail anyway, so save some cycles by failing right away
2318 if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) {
2319 if (wishaddr_or_fail) {
2320 return false;
2321 } else {
2322 requested_addr = NULL;
2323 }
2324 }
2325
2326 char* addr = NULL;
2327
2328 // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change
2329 // pagesize dynamically.
2330 const size_t size = align_size_up(bytes, SIZE_16M);
2331
2332 // reserve the shared segment
2333 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2334 if (shmid == -1) {
2335 warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno);
2336 return false;
2337 }
2338
2339 // Important note:
2340 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2341 // We must right after attaching it remove it from the system. System V shm segments are global and
2342 // survive the process.
2343 // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm".
2344
2345 // try forcing the page size
2346 size_t pagesize = -1; // unknown so far
2347
2348 if (UseLargePages) {
2349
2350 struct shmid_ds shmbuf;
2351 memset(&shmbuf, 0, sizeof(shmbuf));
2352
2353 // First, try to take from 16M page pool if...
2354 if (os::Aix::can_use_16M_pages() // we can ...
2355 && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages)..
2356 && try_16M_pages) { // caller wants us to.
2357 shmbuf.shm_pagesize = SIZE_16M;
2358 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2359 pagesize = SIZE_16M;
2360 } else {
2361 warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)",
2362 size / SIZE_16M, errno);
2363 if (f16M_pages_or_fail) {
2364 goto cleanup_shm;
2365 }
2366 }
2367 }
2368
2369 // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might,
2370 // because the 64K page pool may also be exhausted.
2371 if (pagesize == -1) {
2372 shmbuf.shm_pagesize = SIZE_64K;
2373 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2374 pagesize = SIZE_64K;
2375 } else {
2376 warning("Failed to allocate %d 64K pages. (shmctl failed with %d)",
2377 size / SIZE_64K, errno);
2378 // here I give up. leave page_size -1 - later, after attaching, we will query the
2379 // real page size of the attached memory. (in theory, it may be something different
2380 // from 4K if LDR_CNTRL SHM_PSIZE is set)
2381 }
2382 }
2383 }
2384
2385 // sanity point
2386 assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size");
2387
2388 // Now attach the shared segment.
2389 addr = (char*) shmat(shmid, requested_addr, 0);
2390 if (addr == (char*)-1) {
2391 // How to handle attach failure:
2392 // If it failed for a specific wish address, tolerate this: in that case, if wish address was
2393 // mandatory, fail, if not, retry anywhere.
2394 // If it failed for any other reason, treat that as fatal error.
2395 addr = NULL;
2396 if (requested_addr) {
2397 if (wishaddr_or_fail) {
2398 goto cleanup_shm;
2399 } else {
2400 addr = (char*) shmat(shmid, NULL, 0);
2401 if (addr == (char*)-1) { // fatal
2402 addr = NULL;
2403 warning("shmat failed (errno: %d)", errno);
2404 goto cleanup_shm;
2405 }
2406 }
2407 } else { // fatal
2408 addr = NULL;
2409 warning("shmat failed (errno: %d)", errno);
2410 goto cleanup_shm;
2411 }
2412 }
2413
2414 // sanity point
2415 assert(addr && addr != (char*) -1, "wrong address");
2416
2417 // after successful Attach remove the segment - right away.
2418 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2419 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2420 guarantee(false, "failed to remove shared memory segment!");
2421 }
2422 shmid = -1;
2423
2424 // query the real page size. In case setting the page size did not work (see above), the system
2425 // may have given us something other then 4K (LDR_CNTRL)
2426 {
2427 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2428 if (pagesize != -1) {
2429 assert(pagesize == real_pagesize, "unexpected pagesize after shmat");
2430 } else {
2431 pagesize = real_pagesize;
2432 }
2433 }
2434
2435 // Now register the reserved block with internal book keeping.
2436 LOCK_SHMBK
2437 const bool pinned = pagesize >= SIZE_16M ? true : false;
2438 ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned);
2439 assert(p_block, "");
2440 shmbk_register(p_block);
2441 UNLOCK_SHMBK
2442
2443 cleanup_shm:
2444
2445 // if we have not done so yet, remove the shared memory segment. This is very important.
2446 if (shmid != -1) {
2447 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2448 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2449 guarantee(false, "failed to remove shared memory segment!");
2450 }
2451 shmid = -1;
2452 }
2453
2454 // trace
2455 if (Verbose && !addr) {
2456 if (requested_addr != NULL) {
2457 warning("failed to shm-allocate 0x%llX bytes at wish address 0x%p.", size, requested_addr);
2458 } else {
2459 warning("failed to shm-allocate 0x%llX bytes at any address.", size);
2460 }
2461 }
2462
2463 // hand info to caller
2464 if (addr) {
2465 p_info->addr = addr;
2466 p_info->pagesize = pagesize;
2467 p_info->pinned = pagesize == SIZE_16M ? true : false;
2468 }
2469
2470 // sanity test:
2471 if (requested_addr && addr && wishaddr_or_fail) {
2472 guarantee(addr == requested_addr, "shmat error");
2473 }
2474
2475 // just one more test to really make sure we have no dangling shm segments.
2476 guarantee(shmid == -1, "dangling shm segments");
2477
2478 return addr ? true : false;
2479
2480 } // end: reserve_shmatted_memory
2481
2482 // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory():
2483 // will return NULL in case of an error.
2484 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) {
2485
2486 // if a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2487 if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) {
2488 warning("Wish address 0x%p not aligned to page boundary.", requested_addr);
2489 return NULL;
2490 }
2491
2492 const size_t size = align_size_up(bytes, SIZE_4K);
2493
2494 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2495 // msync(MS_INVALIDATE) (see os::uncommit_memory)
2496 int flags = MAP_ANONYMOUS | MAP_SHARED;
2497
2498 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2499 // it means if wishaddress is given but MAP_FIXED is not set.
2500 //
2501 // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED
2502 // clobbers the address range, which is probably not what the caller wants. That's
2503 // why I assert here (again) that the SPEC1170 compat mode is off.
2504 // If we want to be able to run under SPEC1170, we have to do some porting and
2505 // testing.
2506 if (requested_addr != NULL) {
2507 assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed.");
2508 flags |= MAP_FIXED;
2509 }
2510
2511 char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2512
2513 if (addr == MAP_FAILED) {
2514 // attach failed: tolerate for specific wish addresses. Not being able to attach
2515 // anywhere is a fatal error.
2516 if (requested_addr == NULL) {
2517 // It's ok to fail here if the machine has not enough memory.
2518 warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno);
2519 }
2520 addr = NULL;
2521 goto cleanup_mmap;
2522 }
2523
2524 // If we did request a specific address and that address was not available, fail.
2525 if (addr && requested_addr) {
2526 guarantee(addr == requested_addr, "unexpected");
2527 }
2528
2529 // register this mmap'ed segment with book keeping
2530 LOCK_SHMBK
2531 ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size));
2532 assert(p_block, "");
2533 shmbk_register(p_block);
2534 UNLOCK_SHMBK
2535
2536 cleanup_mmap:
2537
2538 // trace
2539 if (Verbose) {
2540 if (addr) {
2541 fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes);
2542 }
2543 else {
2544 if (requested_addr != NULL) {
2545 warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr);
2546 } else {
2547 warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes);
2548 }
2549 }
2550 }
2551
2552 return addr;
2553
2554 } // end: reserve_mmaped_memory
2555
2556 // Reserves and attaches a shared memory segment.
2557 // Will assert if a wish address is given and could not be obtained.
2558 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2559 return os::attempt_reserve_memory_at(bytes, requested_addr);
2560 }
2561
2562 bool os::pd_release_memory(char* addr, size_t size) {
2563
2564 // delegate to ShmBkBlock class which knows how to uncommit its memory.
2565
2566 bool rc = false;
2567 LOCK_SHMBK
2568 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2569 if (!block) {
2570 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2571 shmbk_dump_info();
2572 assert(false, "invalid pointer");
2573 return false;
2574 }
2575 else if (!block->isSameRange(addr, size)) {
2576 if (block->getType() == ShmBkBlock::MMAP) {
2577 // Release only the same range or a the beginning or the end of a range.
2578 if (block->base() == addr && size < block->size()) {
2579 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size));
2580 assert(b, "");
2581 shmbk_register(b);
2582 block->setAddrRange(AddrRange(addr, size));
2583 }
2584 else if (addr > block->base() && addr + size == block->base() + block->size()) {
2585 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size));
2586 assert(b, "");
2587 shmbk_register(b);
2588 block->setAddrRange(AddrRange(addr, size));
2589 }
2590 else {
2591 fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size);
2592 shmbk_dump_info();
2593 assert(false, "invalid mmap range");
2594 return false;
2595 }
2596 }
2597 else {
2598 // Release only the same range. No partial release allowed.
2599 // Soften the requirement a bit, because the user may think he owns a smaller size
2600 // than the block is due to alignment etc.
2601 if (block->base() != addr || block->size() < size) {
2602 fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size);
2603 shmbk_dump_info();
2604 assert(false, "invalid shmget range");
2605 return false;
2606 }
2607 }
2608 }
2609 rc = block->release();
2610 assert(rc, "release failed");
2611 // remove block from bookkeeping
2612 shmbk_unregister(block);
2613 delete block;
2614 UNLOCK_SHMBK
2615
2616 if (!rc) {
2617 warning("failed to released %lu bytes at 0x%p", size, addr);
2618 }
2619
2620 return rc;
2621 }
2622
2623 static bool checked_mprotect(char* addr, size_t size, int prot) {
2624
2625 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2626 // not tell me if protection failed when trying to protect an un-protectable range.
2627 //
2628 // This means if the memory was allocated using shmget/shmat, protection wont work
2629 // but mprotect will still return 0:
2630 //
2631 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2632
2633 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2634
2635 if (!rc) {
2636 const char* const s_errno = strerror(errno);
2637 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2638 return false;
2639 }
2640
2641 // mprotect success check
2642 //
2643 // Mprotect said it changed the protection but can I believe it?
2644 //
2645 // To be sure I need to check the protection afterwards. Try to
2646 // read from protected memory and check whether that causes a segfault.
2647 //
2648 if (!os::Aix::xpg_sus_mode()) {
2649
2650 if (StubRoutines::SafeFetch32_stub()) {
2651
2652 const bool read_protected =
2653 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2654 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2655
2656 if (prot & PROT_READ) {
2657 rc = !read_protected;
2658 } else {
2659 rc = read_protected;
2660 }
2661 }
2662 }
2663 if (!rc) {
2664 assert(false, "mprotect failed.");
2665 }
2666 return rc;
2667 }
2668
2669 // Set protections specified
2670 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2671 unsigned int p = 0;
2672 switch (prot) {
2673 case MEM_PROT_NONE: p = PROT_NONE; break;
2674 case MEM_PROT_READ: p = PROT_READ; break;
2675 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2676 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2677 default:
2678 ShouldNotReachHere();
2679 }
2680 // is_committed is unused.
2681 return checked_mprotect(addr, size, p);
2682 }
2683
2684 bool os::guard_memory(char* addr, size_t size) {
2685 return checked_mprotect(addr, size, PROT_NONE);
2686 }
2687
2688 bool os::unguard_memory(char* addr, size_t size) {
2689 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2690 }
2691
2692 // Large page support
2693
2694 static size_t _large_page_size = 0;
2695
2696 // Enable large page support if OS allows that.
2697 void os::large_page_init() {
2698
2699 // Note: os::Aix::query_multipage_support must run first.
2700
2701 if (!UseLargePages) {
2702 return;
2703 }
2704
2705 if (!Aix::can_use_64K_pages()) {
2706 assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M.");
2707 UseLargePages = false;
2708 return;
2709 }
2710
2711 if (!Aix::can_use_16M_pages() && Use16MPages) {
2712 fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool "
2713 " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n");
2714 }
2715
2716 // Do not report 16M page alignment as part of os::_page_sizes if we are
2717 // explicitly forbidden from using 16M pages. Doing so would increase the
2718 // alignment the garbage collector calculates with, slightly increasing
2719 // heap usage. We should only pay for 16M alignment if we really want to
2720 // use 16M pages.
2721 if (Use16MPages && Aix::can_use_16M_pages()) {
2722 _large_page_size = SIZE_16M;
2723 _page_sizes[0] = SIZE_16M;
2724 _page_sizes[1] = SIZE_64K;
2725 _page_sizes[2] = SIZE_4K;
2726 _page_sizes[3] = 0;
2727 } else if (Aix::can_use_64K_pages()) {
2728 _large_page_size = SIZE_64K;
2729 _page_sizes[0] = SIZE_64K;
2730 _page_sizes[1] = SIZE_4K;
2731 _page_sizes[2] = 0;
2732 }
2733
2734 if (Verbose) {
2735 ("Default large page size is 0x%llX.", _large_page_size);
2736 }
2737 } // end: os::large_page_init()
2738
2739 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2740 // "exec" is passed in but not used. Creating the shared image for
2741 // the code cache doesn't have an SHM_X executable permission to check.
2742 Unimplemented();
2743 return 0;
2744 }
2745
2746 bool os::release_memory_special(char* base, size_t bytes) {
2747 // detaching the SHM segment will also delete it, see reserve_memory_special()
2748 Unimplemented();
2749 return false;
2750 }
2751
2752 size_t os::large_page_size() {
2753 return _large_page_size;
2754 }
2755
2756 bool os::can_commit_large_page_memory() {
2757 // Well, sadly we cannot commit anything at all (see comment in
2758 // os::commit_memory) but we claim to so we can make use of large pages
2759 return true;
2760 }
2761
2762 bool os::can_execute_large_page_memory() {
2763 // We can do that
2764 return true;
2765 }
2766
2767 // Reserve memory at an arbitrary address, only if that area is
2768 // available (and not reserved for something else).
2769 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2770
2771 bool use_mmap = false;
2772
2773 // mmap: smaller graining, no large page support
2774 // shm: large graining (256M), large page support, limited number of shm segments
2775 //
2776 // Prefer mmap wherever we either do not need large page support or have OS limits
2777
2778 if (!UseLargePages || bytes < SIZE_16M) {
2779 use_mmap = true;
2780 }
2781
2782 char* addr = NULL;
2783 if (use_mmap) {
2784 addr = reserve_mmaped_memory(bytes, requested_addr);
2785 } else {
2786 // shmat: wish address is mandatory, and do not try 16M pages here.
2787 shmatted_memory_info_t info;
2788 const int flags = RESSHM_WISHADDR_OR_FAIL;
2789 if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) {
2790 addr = info.addr;
2791 }
2792 }
2793
2794 return addr;
2795 }
2796
2797 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2798 return ::read(fd, buf, nBytes);
2799 }
2800
2801 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2802 return ::pread(fd, buf, nBytes, offset);
2803 }
2804
2805 #define NANOSECS_PER_MILLISEC 1000000
2806
2807 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
2808 assert(thread == Thread::current(), "thread consistency check");
2809
2810 // Prevent nasty overflow in deadline calculation
2811 // by handling long sleeps similar to solaris or windows.
2812 const jlong limit = INT_MAX;
2813 int result;
2814 while (millis > limit) {
2815 if ((result = os::sleep(thread, limit, interruptible)) != OS_OK) {
2816 return result;
2817 }
2818 millis -= limit;
2819 }
2820
2821 ParkEvent * const slp = thread->_SleepEvent;
2822 slp->reset();
2823 OrderAccess::fence();
2824
2825 if (interruptible) {
2826 jlong prevtime = javaTimeNanos();
2827
2828 // Prevent precision loss and too long sleeps
2829 jlong deadline = prevtime + millis * NANOSECS_PER_MILLISEC;
2830
2831 for (;;) {
2832 if (os::is_interrupted(thread, true)) {
2833 return OS_INTRPT;
2834 }
2835
2836 jlong newtime = javaTimeNanos();
2837
2838 assert(newtime >= prevtime, "time moving backwards");
2839 // Doing prevtime and newtime in microseconds doesn't help precision,
2840 // and trying to round up to avoid lost milliseconds can result in a
2841 // too-short delay.
2842 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2843
2844 if (millis <= 0) {
2845 return OS_OK;
2846 }
2847
2848 // Stop sleeping if we passed the deadline
2849 if (newtime >= deadline) {
2850 return OS_OK;
2851 }
2852
2853 prevtime = newtime;
2854
2855 {
2856 assert(thread->is_Java_thread(), "sanity check");
2857 JavaThread *jt = (JavaThread *) thread;
2858 ThreadBlockInVM tbivm(jt);
2859 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
2860
2861 jt->set_suspend_equivalent();
2862
2863 slp->park(millis);
2864
2865 // were we externally suspended while we were waiting?
2866 jt->check_and_wait_while_suspended();
2867 }
2868 }
2869 } else {
2870 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
2871 jlong prevtime = javaTimeNanos();
2872
2873 // Prevent precision loss and too long sleeps
2874 jlong deadline = prevtime + millis * NANOSECS_PER_MILLISEC;
2875
2876 for (;;) {
2877 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on
2878 // the 1st iteration ...
2879 jlong newtime = javaTimeNanos();
2880
2881 if (newtime - prevtime < 0) {
2882 // time moving backwards, should only happen if no monotonic clock
2883 // not a guarantee() because JVM should not abort on kernel/glibc bugs
2884 // - HS14 Commented out as not implemented.
2885 // - TODO Maybe we should implement it?
2886 //assert(!Aix::supports_monotonic_clock(), "time moving backwards");
2887 } else {
2888 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
2889 }
2890
2891 if (millis <= 0) break;
2892
2893 if (newtime >= deadline) {
2894 break;
2895 }
2896
2897 prevtime = newtime;
2898 slp->park(millis);
2899 }
2900 return OS_OK;
2901 }
2902 }
2903
2904 void os::naked_short_sleep(jlong ms) {
2905 struct timespec req;
2906
2907 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2908 req.tv_sec = 0;
2909 if (ms > 0) {
2910 req.tv_nsec = (ms % 1000) * 1000000;
2911 }
2912 else {
2913 req.tv_nsec = 1;
2914 }
2915
2916 nanosleep(&req, NULL);
2917
2918 return;
2919 }
2920
2921 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2922 void os::infinite_sleep() {
2923 while (true) { // sleep forever ...
2924 ::sleep(100); // ... 100 seconds at a time
2925 }
2926 }
2927
2928 // Used to convert frequent JVM_Yield() to nops
2929 bool os::dont_yield() {
2930 return DontYieldALot;
2931 }
2932
2933 void os::yield() {
2934 sched_yield();
2935 }
2936
2937 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN; }
2938
2939 void os::yield_all(int attempts) {
2940 // Yields to all threads, including threads with lower priorities
2941 // Threads on Linux are all with same priority. The Solaris style
2942 // os::yield_all() with nanosleep(1ms) is not necessary.
2943 sched_yield();
2944 }
2945
2946 // Called from the tight loops to possibly influence time-sharing heuristics
2947 void os::loop_breaker(int attempts) {
2948 os::yield_all(attempts);
2949 }
2950
2951 ////////////////////////////////////////////////////////////////////////////////
2952 // thread priority support
2953
2954 // From AIX manpage to pthread_setschedparam
2955 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2956 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2957 //
2958 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2959 // range from 40 to 80, where 40 is the least favored priority and 80
2960 // is the most favored."
2961 //
2962 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2963 // scheduling there; however, this still leaves iSeries.)
2964 //
2965 // We use the same values for AIX and PASE.
2966 int os::java_to_os_priority[CriticalPriority + 1] = {
2967 54, // 0 Entry should never be used
2968
2969 55, // 1 MinPriority
2970 55, // 2
2971 56, // 3
2972
2973 56, // 4
2974 57, // 5 NormPriority
2975 57, // 6
2976
2977 58, // 7
2978 58, // 8
2979 59, // 9 NearMaxPriority
2980
2981 60, // 10 MaxPriority
2982
2983 60 // 11 CriticalPriority
2984 };
2985
2986 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2987 if (!UseThreadPriorities) return OS_OK;
2988 pthread_t thr = thread->osthread()->pthread_id();
2989 int policy = SCHED_OTHER;
2990 struct sched_param param;
2991 param.sched_priority = newpri;
2992 int ret = pthread_setschedparam(thr, policy, ¶m);
2993
2994 if (ret != 0) {
2995 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2996 (int)thr, newpri, ret, strerror(ret));
2997 }
2998 return (ret == 0) ? OS_OK : OS_ERR;
2999 }
3000
3001 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
3002 if (!UseThreadPriorities) {
3003 *priority_ptr = java_to_os_priority[NormPriority];
3004 return OS_OK;
3005 }
3006 pthread_t thr = thread->osthread()->pthread_id();
3007 int policy = SCHED_OTHER;
3008 struct sched_param param;
3009 int ret = pthread_getschedparam(thr, &policy, ¶m);
3010 *priority_ptr = param.sched_priority;
3011
3012 return (ret == 0) ? OS_OK : OS_ERR;
3013 }
3014
3015 // Hint to the underlying OS that a task switch would not be good.
3016 // Void return because it's a hint and can fail.
3017 void os::hint_no_preempt() {}
3018
3019 ////////////////////////////////////////////////////////////////////////////////
3020 // suspend/resume support
3021
3022 // the low-level signal-based suspend/resume support is a remnant from the
3023 // old VM-suspension that used to be for java-suspension, safepoints etc,
3024 // within hotspot. Now there is a single use-case for this:
3025 // - calling get_thread_pc() on the VMThread by the flat-profiler task
3026 // that runs in the watcher thread.
3027 // The remaining code is greatly simplified from the more general suspension
3028 // code that used to be used.
3029 //
3030 // The protocol is quite simple:
3031 // - suspend:
3032 // - sends a signal to the target thread
3033 // - polls the suspend state of the osthread using a yield loop
3034 // - target thread signal handler (SR_handler) sets suspend state
3035 // and blocks in sigsuspend until continued
3036 // - resume:
3037 // - sets target osthread state to continue
3038 // - sends signal to end the sigsuspend loop in the SR_handler
3039 //
3040 // Note that the SR_lock plays no role in this suspend/resume protocol.
3041 //
3042
3043 static void resume_clear_context(OSThread *osthread) {
3044 osthread->set_ucontext(NULL);
3045 osthread->set_siginfo(NULL);
3046 }
3047
3048 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
3049 osthread->set_ucontext(context);
3050 osthread->set_siginfo(siginfo);
3051 }
3052
3053 //
3054 // Handler function invoked when a thread's execution is suspended or
3055 // resumed. We have to be careful that only async-safe functions are
3056 // called here (Note: most pthread functions are not async safe and
3057 // should be avoided.)
3058 //
3059 // Note: sigwait() is a more natural fit than sigsuspend() from an
3060 // interface point of view, but sigwait() prevents the signal hander
3061 // from being run. libpthread would get very confused by not having
3062 // its signal handlers run and prevents sigwait()'s use with the
3063 // mutex granting granting signal.
3064 //
3065 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
3066 //
3067 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
3068 // Save and restore errno to avoid confusing native code with EINTR
3069 // after sigsuspend.
3070 int old_errno = errno;
3071
3072 Thread* thread = Thread::current();
3073 OSThread* osthread = thread->osthread();
3074 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
3075
3076 os::SuspendResume::State current = osthread->sr.state();
3077 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
3078 suspend_save_context(osthread, siginfo, context);
3079
3080 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
3081 os::SuspendResume::State state = osthread->sr.suspended();
3082 if (state == os::SuspendResume::SR_SUSPENDED) {
3083 sigset_t suspend_set; // signals for sigsuspend()
3084
3085 // get current set of blocked signals and unblock resume signal
3086 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
3087 sigdelset(&suspend_set, SR_signum);
3088
3089 // wait here until we are resumed
3090 while (1) {
3091 sigsuspend(&suspend_set);
3092
3093 os::SuspendResume::State result = osthread->sr.running();
3094 if (result == os::SuspendResume::SR_RUNNING) {
3095 break;
3096 }
3097 }
3098
3099 } else if (state == os::SuspendResume::SR_RUNNING) {
3100 // request was cancelled, continue
3101 } else {
3102 ShouldNotReachHere();
3103 }
3104
3105 resume_clear_context(osthread);
3106 } else if (current == os::SuspendResume::SR_RUNNING) {
3107 // request was cancelled, continue
3108 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3109 // ignore
3110 } else {
3111 ShouldNotReachHere();
3112 }
3113
3114 errno = old_errno;
3115 }
3116
3117 static int SR_initialize() {
3118 struct sigaction act;
3119 char *s;
3120 // Get signal number to use for suspend/resume
3121 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
3122 int sig = ::strtol(s, 0, 10);
3123 if (sig > 0 || sig < NSIG) {
3124 SR_signum = sig;
3125 }
3126 }
3127
3128 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
3129 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
3130
3131 sigemptyset(&SR_sigset);
3132 sigaddset(&SR_sigset, SR_signum);
3133
3134 // Set up signal handler for suspend/resume.
3135 act.sa_flags = SA_RESTART|SA_SIGINFO;
3136 act.sa_handler = (void (*)(int)) SR_handler;
3137
3138 // SR_signum is blocked by default.
3139 // 4528190 - We also need to block pthread restart signal (32 on all
3140 // supported Linux platforms). Note that LinuxThreads need to block
3141 // this signal for all threads to work properly. So we don't have
3142 // to use hard-coded signal number when setting up the mask.
3143 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
3144
3145 if (sigaction(SR_signum, &act, 0) == -1) {
3146 return -1;
3147 }
3148
3149 // Save signal flag
3150 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
3151 return 0;
3152 }
3153
3154 static int SR_finalize() {
3155 return 0;
3156 }
3157
3158 static int sr_notify(OSThread* osthread) {
3159 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3160 assert_status(status == 0, status, "pthread_kill");
3161 return status;
3162 }
3163
3164 // "Randomly" selected value for how long we want to spin
3165 // before bailing out on suspending a thread, also how often
3166 // we send a signal to a thread we want to resume
3167 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3168 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3169
3170 // returns true on success and false on error - really an error is fatal
3171 // but this seems the normal response to library errors
3172 static bool do_suspend(OSThread* osthread) {
3173 assert(osthread->sr.is_running(), "thread should be running");
3174 // mark as suspended and send signal
3175
3176 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3177 // failed to switch, state wasn't running?
3178 ShouldNotReachHere();
3179 return false;
3180 }
3181
3182 if (sr_notify(osthread) != 0) {
3183 // try to cancel, switch to running
3184
3185 os::SuspendResume::State result = osthread->sr.cancel_suspend();
3186 if (result == os::SuspendResume::SR_RUNNING) {
3187 // cancelled
3188 return false;
3189 } else if (result == os::SuspendResume::SR_SUSPENDED) {
3190 // somehow managed to suspend
3191 return true;
3192 } else {
3193 ShouldNotReachHere();
3194 return false;
3195 }
3196 }
3197
3198 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3199
3200 for (int n = 0; !osthread->sr.is_suspended(); n++) {
3201 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
3202 os::yield_all(i);
3203 }
3204
3205 // timeout, try to cancel the request
3206 if (n >= RANDOMLY_LARGE_INTEGER) {
3207 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3208 if (cancelled == os::SuspendResume::SR_RUNNING) {
3209 return false;
3210 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3211 return true;
3212 } else {
3213 ShouldNotReachHere();
3214 return false;
3215 }
3216 }
3217 }
3218
3219 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3220 return true;
3221 }
3222
3223 static void do_resume(OSThread* osthread) {
3224 //assert(osthread->sr.is_suspended(), "thread should be suspended");
3225
3226 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3227 // failed to switch to WAKEUP_REQUEST
3228 ShouldNotReachHere();
3229 return;
3230 }
3231
3232 while (!osthread->sr.is_running()) {
3233 if (sr_notify(osthread) == 0) {
3234 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
3235 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
3236 os::yield_all(i);
3237 }
3238 }
3239 } else {
3240 ShouldNotReachHere();
3241 }
3242 }
3243
3244 guarantee(osthread->sr.is_running(), "Must be running!");
3245 }
3246
3247 ////////////////////////////////////////////////////////////////////////////////
3248 // interrupt support
3249
3250 void os::interrupt(Thread* thread) {
3251 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
3252 "possibility of dangling Thread pointer");
3253
3254 OSThread* osthread = thread->osthread();
3255
3256 if (!osthread->interrupted()) {
3257 osthread->set_interrupted(true);
3258 // More than one thread can get here with the same value of osthread,
3259 // resulting in multiple notifications. We do, however, want the store
3260 // to interrupted() to be visible to other threads before we execute unpark().
3261 OrderAccess::fence();
3262 ParkEvent * const slp = thread->_SleepEvent;
3263 if (slp != NULL) slp->unpark();
3264 }
3265
3266 // For JSR166. Unpark even if interrupt status already was set
3267 if (thread->is_Java_thread())
3268 ((JavaThread*)thread)->parker()->unpark();
3269
3270 ParkEvent * ev = thread->_ParkEvent;
3271 if (ev != NULL) ev->unpark();
3272
3273 }
3274
3275 bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
3276 assert(Thread::current() == thread || Threads_lock->owned_by_self(),
3277 "possibility of dangling Thread pointer");
3278
3279 OSThread* osthread = thread->osthread();
3280
3281 bool interrupted = osthread->interrupted();
3282
3283 if (interrupted && clear_interrupted) {
3284 osthread->set_interrupted(false);
3285 // consider thread->_SleepEvent->reset() ... optional optimization
3286 }
3287
3288 return interrupted;
3289 }
3290
3291 ///////////////////////////////////////////////////////////////////////////////////
3292 // signal handling (except suspend/resume)
3293
3294 // This routine may be used by user applications as a "hook" to catch signals.
3295 // The user-defined signal handler must pass unrecognized signals to this
3296 // routine, and if it returns true (non-zero), then the signal handler must
3297 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3298 // routine will never retun false (zero), but instead will execute a VM panic
3299 // routine kill the process.
3300 //
3301 // If this routine returns false, it is OK to call it again. This allows
3302 // the user-defined signal handler to perform checks either before or after
3303 // the VM performs its own checks. Naturally, the user code would be making
3304 // a serious error if it tried to handle an exception (such as a null check
3305 // or breakpoint) that the VM was generating for its own correct operation.
3306 //
3307 // This routine may recognize any of the following kinds of signals:
3308 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3309 // It should be consulted by handlers for any of those signals.
3310 //
3311 // The caller of this routine must pass in the three arguments supplied
3312 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3313 // field of the structure passed to sigaction(). This routine assumes that
3314 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3315 //
3316 // Note that the VM will print warnings if it detects conflicting signal
3317 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3318 //
3319 extern "C" JNIEXPORT int
3320 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
3321
3322 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3323 // to be the thing to call; documentation is not terribly clear about whether
3324 // pthread_sigmask also works, and if it does, whether it does the same.
3325 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3326 const int rc = ::pthread_sigmask(how, set, oset);
3327 // return value semantics differ slightly for error case:
3328 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3329 // (so, pthread_sigmask is more theadsafe for error handling)
3330 // But success is always 0.
3331 return rc == 0 ? true : false;
3332 }
3333
3334 // Function to unblock all signals which are, according
3335 // to POSIX, typical program error signals. If they happen while being blocked,
3336 // they typically will bring down the process immediately.
3337 bool unblock_program_error_signals() {
3338 sigset_t set;
3339 ::sigemptyset(&set);
3340 ::sigaddset(&set, SIGILL);
3341 ::sigaddset(&set, SIGBUS);
3342 ::sigaddset(&set, SIGFPE);
3343 ::sigaddset(&set, SIGSEGV);
3344 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3345 }
3346
3347 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3348 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3349 assert(info != NULL && uc != NULL, "it must be old kernel");
3350
3351 // Never leave program error signals blocked;
3352 // on all our platforms they would bring down the process immediately when
3353 // getting raised while being blocked.
3354 unblock_program_error_signals();
3355
3356 JVM_handle_aix_signal(sig, info, uc, true);
3357 }
3358
3359 // This boolean allows users to forward their own non-matching signals
3360 // to JVM_handle_aix_signal, harmlessly.
3361 bool os::Aix::signal_handlers_are_installed = false;
3362
3363 // For signal-chaining
3364 struct sigaction os::Aix::sigact[MAXSIGNUM];
3365 unsigned int os::Aix::sigs = 0;
3366 bool os::Aix::libjsig_is_loaded = false;
3367 typedef struct sigaction *(*get_signal_t)(int);
3368 get_signal_t os::Aix::get_signal_action = NULL;
3369
3370 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3371 struct sigaction *actp = NULL;
3372
3373 if (libjsig_is_loaded) {
3374 // Retrieve the old signal handler from libjsig
3375 actp = (*get_signal_action)(sig);
3376 }
3377 if (actp == NULL) {
3378 // Retrieve the preinstalled signal handler from jvm
3379 actp = get_preinstalled_handler(sig);
3380 }
3381
3382 return actp;
3383 }
3384
3385 static bool call_chained_handler(struct sigaction *actp, int sig,
3386 siginfo_t *siginfo, void *context) {
3387 // Call the old signal handler
3388 if (actp->sa_handler == SIG_DFL) {
3389 // It's more reasonable to let jvm treat it as an unexpected exception
3390 // instead of taking the default action.
3391 return false;
3392 } else if (actp->sa_handler != SIG_IGN) {
3393 if ((actp->sa_flags & SA_NODEFER) == 0) {
3394 // automaticlly block the signal
3395 sigaddset(&(actp->sa_mask), sig);
3396 }
3397
3398 sa_handler_t hand = NULL;
3399 sa_sigaction_t sa = NULL;
3400 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3401 // retrieve the chained handler
3402 if (siginfo_flag_set) {
3403 sa = actp->sa_sigaction;
3404 } else {
3405 hand = actp->sa_handler;
3406 }
3407
3408 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3409 actp->sa_handler = SIG_DFL;
3410 }
3411
3412 // try to honor the signal mask
3413 sigset_t oset;
3414 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3415
3416 // call into the chained handler
3417 if (siginfo_flag_set) {
3418 (*sa)(sig, siginfo, context);
3419 } else {
3420 (*hand)(sig);
3421 }
3422
3423 // restore the signal mask
3424 pthread_sigmask(SIG_SETMASK, &oset, 0);
3425 }
3426 // Tell jvm's signal handler the signal is taken care of.
3427 return true;
3428 }
3429
3430 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3431 bool chained = false;
3432 // signal-chaining
3433 if (UseSignalChaining) {
3434 struct sigaction *actp = get_chained_signal_action(sig);
3435 if (actp != NULL) {
3436 chained = call_chained_handler(actp, sig, siginfo, context);
3437 }
3438 }
3439 return chained;
3440 }
3441
3442 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3443 if ((((unsigned int)1 << sig) & sigs) != 0) {
3444 return &sigact[sig];
3445 }
3446 return NULL;
3447 }
3448
3449 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3450 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3451 sigact[sig] = oldAct;
3452 sigs |= (unsigned int)1 << sig;
3453 }
3454
3455 // for diagnostic
3456 int os::Aix::sigflags[MAXSIGNUM];
3457
3458 int os::Aix::get_our_sigflags(int sig) {
3459 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3460 return sigflags[sig];
3461 }
3462
3463 void os::Aix::set_our_sigflags(int sig, int flags) {
3464 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3465 sigflags[sig] = flags;
3466 }
3467
3468 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3469 // Check for overwrite.
3470 struct sigaction oldAct;
3471 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3472
3473 void* oldhand = oldAct.sa_sigaction
3474 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3475 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3476 // Renamed 'signalHandler' to avoid collision with other shared libs.
3477 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3478 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3479 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3480 if (AllowUserSignalHandlers || !set_installed) {
3481 // Do not overwrite; user takes responsibility to forward to us.
3482 return;
3483 } else if (UseSignalChaining) {
3484 // save the old handler in jvm
3485 save_preinstalled_handler(sig, oldAct);
3486 // libjsig also interposes the sigaction() call below and saves the
3487 // old sigaction on it own.
3488 } else {
3489 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3490 "%#lx for signal %d.", (long)oldhand, sig));
3491 }
3492 }
3493
3494 struct sigaction sigAct;
3495 sigfillset(&(sigAct.sa_mask));
3496 if (!set_installed) {
3497 sigAct.sa_handler = SIG_DFL;
3498 sigAct.sa_flags = SA_RESTART;
3499 } else {
3500 // Renamed 'signalHandler' to avoid collision with other shared libs.
3501 sigAct.sa_sigaction = javaSignalHandler;
3502 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3503 }
3504 // Save flags, which are set by ours
3505 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3506 sigflags[sig] = sigAct.sa_flags;
3507
3508 int ret = sigaction(sig, &sigAct, &oldAct);
3509 assert(ret == 0, "check");
3510
3511 void* oldhand2 = oldAct.sa_sigaction
3512 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3513 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3514 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3515 }
3516
3517 // install signal handlers for signals that HotSpot needs to
3518 // handle in order to support Java-level exception handling.
3519 void os::Aix::install_signal_handlers() {
3520 if (!signal_handlers_are_installed) {
3521 signal_handlers_are_installed = true;
3522
3523 // signal-chaining
3524 typedef void (*signal_setting_t)();
3525 signal_setting_t begin_signal_setting = NULL;
3526 signal_setting_t end_signal_setting = NULL;
3527 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3528 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3529 if (begin_signal_setting != NULL) {
3530 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3531 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3532 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3533 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3534 libjsig_is_loaded = true;
3535 assert(UseSignalChaining, "should enable signal-chaining");
3536 }
3537 if (libjsig_is_loaded) {
3538 // Tell libjsig jvm is setting signal handlers
3539 (*begin_signal_setting)();
3540 }
3541
3542 set_signal_handler(SIGSEGV, true);
3543 set_signal_handler(SIGPIPE, true);
3544 set_signal_handler(SIGBUS, true);
3545 set_signal_handler(SIGILL, true);
3546 set_signal_handler(SIGFPE, true);
3547 set_signal_handler(SIGTRAP, true);
3548 set_signal_handler(SIGXFSZ, true);
3549 set_signal_handler(SIGDANGER, true);
3550
3551 if (libjsig_is_loaded) {
3552 // Tell libjsig jvm finishes setting signal handlers.
3553 (*end_signal_setting)();
3554 }
3555
3556 // We don't activate signal checker if libjsig is in place, we trust ourselves
3557 // and if UserSignalHandler is installed all bets are off.
3558 // Log that signal checking is off only if -verbose:jni is specified.
3559 if (CheckJNICalls) {
3560 if (libjsig_is_loaded) {
3561 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3562 check_signals = false;
3563 }
3564 if (AllowUserSignalHandlers) {
3565 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3566 check_signals = false;
3567 }
3568 // Need to initialize check_signal_done.
3569 ::sigemptyset(&check_signal_done);
3570 }
3571 }
3572 }
3573
3574 static const char* get_signal_handler_name(address handler,
3575 char* buf, int buflen) {
3576 int offset;
3577 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3578 if (found) {
3579 // skip directory names
3580 const char *p1, *p2;
3581 p1 = buf;
3582 size_t len = strlen(os::file_separator());
3583 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3584 // The way os::dll_address_to_library_name is implemented on Aix
3585 // right now, it always returns -1 for the offset which is not
3586 // terribly informative.
3587 // Will fix that. For now, omit the offset.
3588 jio_snprintf(buf, buflen, "%s", p1);
3589 } else {
3590 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3591 }
3592 return buf;
3593 }
3594
3595 static void print_signal_handler(outputStream* st, int sig,
3596 char* buf, size_t buflen) {
3597 struct sigaction sa;
3598 sigaction(sig, NULL, &sa);
3599
3600 st->print("%s: ", os::exception_name(sig, buf, buflen));
3601
3602 address handler = (sa.sa_flags & SA_SIGINFO)
3603 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3604 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3605
3606 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3607 st->print("SIG_DFL");
3608 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3609 st->print("SIG_IGN");
3610 } else {
3611 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3612 }
3613
3614 // Print readable mask.
3615 st->print(", sa_mask[0]=");
3616 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3617
3618 address rh = VMError::get_resetted_sighandler(sig);
3619 // May be, handler was resetted by VMError?
3620 if (rh != NULL) {
3621 handler = rh;
3622 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3623 }
3624
3625 // Print textual representation of sa_flags.
3626 st->print(", sa_flags=");
3627 os::Posix::print_sa_flags(st, sa.sa_flags);
3628
3629 // Check: is it our handler?
3630 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3631 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3632 // It is our signal handler.
3633 // Check for flags, reset system-used one!
3634 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3635 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3636 os::Aix::get_our_sigflags(sig));
3637 }
3638 }
3639 st->cr();
3640 }
3641
3642 #define DO_SIGNAL_CHECK(sig) \
3643 if (!sigismember(&check_signal_done, sig)) \
3644 os::Aix::check_signal_handler(sig)
3645
3646 // This method is a periodic task to check for misbehaving JNI applications
3647 // under CheckJNI, we can add any periodic checks here
3648
3649 void os::run_periodic_checks() {
3650
3651 if (check_signals == false) return;
3652
3653 // SEGV and BUS if overridden could potentially prevent
3654 // generation of hs*.log in the event of a crash, debugging
3655 // such a case can be very challenging, so we absolutely
3656 // check the following for a good measure:
3657 DO_SIGNAL_CHECK(SIGSEGV);
3658 DO_SIGNAL_CHECK(SIGILL);
3659 DO_SIGNAL_CHECK(SIGFPE);
3660 DO_SIGNAL_CHECK(SIGBUS);
3661 DO_SIGNAL_CHECK(SIGPIPE);
3662 DO_SIGNAL_CHECK(SIGXFSZ);
3663 if (UseSIGTRAP) {
3664 DO_SIGNAL_CHECK(SIGTRAP);
3665 }
3666 DO_SIGNAL_CHECK(SIGDANGER);
3667
3668 // ReduceSignalUsage allows the user to override these handlers
3669 // see comments at the very top and jvm_solaris.h
3670 if (!ReduceSignalUsage) {
3671 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3672 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3673 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3674 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3675 }
3676
3677 DO_SIGNAL_CHECK(SR_signum);
3678 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3679 }
3680
3681 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3682
3683 static os_sigaction_t os_sigaction = NULL;
3684
3685 void os::Aix::check_signal_handler(int sig) {
3686 char buf[O_BUFLEN];
3687 address jvmHandler = NULL;
3688
3689 struct sigaction act;
3690 if (os_sigaction == NULL) {
3691 // only trust the default sigaction, in case it has been interposed
3692 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3693 if (os_sigaction == NULL) return;
3694 }
3695
3696 os_sigaction(sig, (struct sigaction*)NULL, &act);
3697
3698 address thisHandler = (act.sa_flags & SA_SIGINFO)
3699 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3700 : CAST_FROM_FN_PTR(address, act.sa_handler);
3701
3702 switch(sig) {
3703 case SIGSEGV:
3704 case SIGBUS:
3705 case SIGFPE:
3706 case SIGPIPE:
3707 case SIGILL:
3708 case SIGXFSZ:
3709 // Renamed 'signalHandler' to avoid collision with other shared libs.
3710 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3711 break;
3712
3713 case SHUTDOWN1_SIGNAL:
3714 case SHUTDOWN2_SIGNAL:
3715 case SHUTDOWN3_SIGNAL:
3716 case BREAK_SIGNAL:
3717 jvmHandler = (address)user_handler();
3718 break;
3719
3720 case INTERRUPT_SIGNAL:
3721 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3722 break;
3723
3724 default:
3725 if (sig == SR_signum) {
3726 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3727 } else {
3728 return;
3729 }
3730 break;
3731 }
3732
3733 if (thisHandler != jvmHandler) {
3734 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3735 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3736 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3737 // No need to check this sig any longer
3738 sigaddset(&check_signal_done, sig);
3739 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3740 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3741 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3742 exception_name(sig, buf, O_BUFLEN));
3743 }
3744 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3745 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3746 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3747 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3748 // No need to check this sig any longer
3749 sigaddset(&check_signal_done, sig);
3750 }
3751
3752 // Dump all the signal
3753 if (sigismember(&check_signal_done, sig)) {
3754 print_signal_handlers(tty, buf, O_BUFLEN);
3755 }
3756 }
3757
3758 extern bool signal_name(int signo, char* buf, size_t len);
3759
3760 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3761 if (0 < exception_code && exception_code <= SIGRTMAX) {
3762 // signal
3763 if (!signal_name(exception_code, buf, size)) {
3764 jio_snprintf(buf, size, "SIG%d", exception_code);
3765 }
3766 return buf;
3767 } else {
3768 return NULL;
3769 }
3770 }
3771
3772 // To install functions for atexit system call
3773 extern "C" {
3774 static void perfMemory_exit_helper() {
3775 perfMemory_exit();
3776 }
3777 }
3778
3779 // This is called _before_ the most of global arguments have been parsed.
3780 void os::init(void) {
3781 // This is basic, we want to know if that ever changes.
3782 // (shared memory boundary is supposed to be a 256M aligned)
3783 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3784
3785 // First off, we need to know whether we run on AIX or PASE, and
3786 // the OS level we run on.
3787 os::Aix::initialize_os_info();
3788
3789 // Scan environment (SPEC1170 behaviour, etc)
3790 os::Aix::scan_environment();
3791
3792 // Check which pages are supported by AIX.
3793 os::Aix::query_multipage_support();
3794
3795 // Next, we need to initialize libo4 and libperfstat libraries.
3796 if (os::Aix::on_pase()) {
3797 os::Aix::initialize_libo4();
3798 } else {
3799 os::Aix::initialize_libperfstat();
3800 }
3801
3802 // Reset the perfstat information provided by ODM.
3803 if (os::Aix::on_aix()) {
3804 libperfstat::perfstat_reset();
3805 }
3806
3807 // Now initialze basic system properties. Note that for some of the values we
3808 // need libperfstat etc.
3809 os::Aix::initialize_system_info();
3810
3811 // Initialize large page support.
3812 if (UseLargePages) {
3813 os::large_page_init();
3814 if (!UseLargePages) {
3815 // initialize os::_page_sizes
3816 _page_sizes[0] = Aix::page_size();
3817 _page_sizes[1] = 0;
3818 if (Verbose) {
3819 fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n");
3820 }
3821 }
3822 } else {
3823 // initialize os::_page_sizes
3824 _page_sizes[0] = Aix::page_size();
3825 _page_sizes[1] = 0;
3826 }
3827
3828 // debug trace
3829 if (Verbose) {
3830 fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size());
3831 fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size());
3832 fprintf(stderr, "os::_page_sizes = ( ");
3833 for (int i = 0; _page_sizes[i]; i ++) {
3834 fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i]));
3835 }
3836 fprintf(stderr, ")\n");
3837 }
3838
3839 _initial_pid = getpid();
3840
3841 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3842
3843 init_random(1234567);
3844
3845 ThreadCritical::initialize();
3846
3847 // _main_thread points to the thread that created/loaded the JVM.
3848 Aix::_main_thread = pthread_self();
3849
3850 initial_time_count = os::elapsed_counter();
3851 pthread_mutex_init(&dl_mutex, NULL);
3852 }
3853
3854 // This is called _after_ the global arguments have been parsed.
3855 jint os::init_2(void) {
3856
3857 trcVerbose("processor count: %d", os::_processor_count);
3858 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3859
3860 // Initially build up the loaded dll map.
3861 LoadedLibraries::reload();
3862
3863 const int page_size = Aix::page_size();
3864 const int map_size = page_size;
3865
3866 address map_address = (address) MAP_FAILED;
3867 const int prot = PROT_READ;
3868 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3869
3870 // use optimized addresses for the polling page,
3871 // e.g. map it to a special 32-bit address.
3872 if (OptimizePollingPageLocation) {
3873 // architecture-specific list of address wishes:
3874 address address_wishes[] = {
3875 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3876 // PPC64: all address wishes are non-negative 32 bit values where
3877 // the lower 16 bits are all zero. we can load these addresses
3878 // with a single ppc_lis instruction.
3879 (address) 0x30000000, (address) 0x31000000,
3880 (address) 0x32000000, (address) 0x33000000,
3881 (address) 0x40000000, (address) 0x41000000,
3882 (address) 0x42000000, (address) 0x43000000,
3883 (address) 0x50000000, (address) 0x51000000,
3884 (address) 0x52000000, (address) 0x53000000,
3885 (address) 0x60000000, (address) 0x61000000,
3886 (address) 0x62000000, (address) 0x63000000
3887 };
3888 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3889
3890 // iterate over the list of address wishes:
3891 for (int i=0; i<address_wishes_length; i++) {
3892 // try to map with current address wish.
3893 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3894 // fail if the address is already mapped.
3895 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3896 map_size, prot,
3897 flags | MAP_FIXED,
3898 -1, 0);
3899 if (Verbose) {
3900 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3901 address_wishes[i], map_address + (ssize_t)page_size);
3902 }
3903
3904 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3905 // map succeeded and map_address is at wished address, exit loop.
3906 break;
3907 }
3908
3909 if (map_address != (address) MAP_FAILED) {
3910 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3911 ::munmap(map_address, map_size);
3912 map_address = (address) MAP_FAILED;
3913 }
3914 // map failed, continue loop.
3915 }
3916 } // end OptimizePollingPageLocation
3917
3918 if (map_address == (address) MAP_FAILED) {
3919 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3920 }
3921 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3922 os::set_polling_page(map_address);
3923
3924 if (!UseMembar) {
3925 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3926 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3927 os::set_memory_serialize_page(mem_serialize_page);
3928
3929 #ifndef PRODUCT
3930 if (Verbose && PrintMiscellaneous)
3931 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3932 #endif
3933 }
3934
3935 // initialize suspend/resume support - must do this before signal_sets_init()
3936 if (SR_initialize() != 0) {
3937 perror("SR_initialize failed");
3938 return JNI_ERR;
3939 }
3940
3941 Aix::signal_sets_init();
3942 Aix::install_signal_handlers();
3943
3944 // Check minimum allowable stack size for thread creation and to initialize
3945 // the java system classes, including StackOverflowError - depends on page
3946 // size. Add a page for compiler2 recursion in main thread.
3947 // Add in 2*BytesPerWord times page size to account for VM stack during
3948 // class initialization depending on 32 or 64 bit VM.
3949 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3950 (size_t)(StackYellowPages+StackRedPages+StackShadowPages +
3951 2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size());
3952
3953 size_t threadStackSizeInBytes = ThreadStackSize * K;
3954 if (threadStackSizeInBytes != 0 &&
3955 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3956 tty->print_cr("\nThe stack size specified is too small, "
3957 "Specify at least %dk",
3958 os::Aix::min_stack_allowed / K);
3959 return JNI_ERR;
3960 }
3961
3962 // Make the stack size a multiple of the page size so that
3963 // the yellow/red zones can be guarded.
3964 // Note that this can be 0, if no default stacksize was set.
3965 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3966
3967 Aix::libpthread_init();
3968
3969 if (MaxFDLimit) {
3970 // set the number of file descriptors to max. print out error
3971 // if getrlimit/setrlimit fails but continue regardless.
3972 struct rlimit nbr_files;
3973 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3974 if (status != 0) {
3975 if (PrintMiscellaneous && (Verbose || WizardMode))
3976 perror("os::init_2 getrlimit failed");
3977 } else {
3978 nbr_files.rlim_cur = nbr_files.rlim_max;
3979 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3980 if (status != 0) {
3981 if (PrintMiscellaneous && (Verbose || WizardMode))
3982 perror("os::init_2 setrlimit failed");
3983 }
3984 }
3985 }
3986
3987 if (PerfAllowAtExitRegistration) {
3988 // only register atexit functions if PerfAllowAtExitRegistration is set.
3989 // atexit functions can be delayed until process exit time, which
3990 // can be problematic for embedded VM situations. Embedded VMs should
3991 // call DestroyJavaVM() to assure that VM resources are released.
3992
3993 // note: perfMemory_exit_helper atexit function may be removed in
3994 // the future if the appropriate cleanup code can be added to the
3995 // VM_Exit VMOperation's doit method.
3996 if (atexit(perfMemory_exit_helper) != 0) {
3997 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3998 }
3999 }
4000
4001 return JNI_OK;
4002 }
4003
4004 // Mark the polling page as unreadable
4005 void os::make_polling_page_unreadable(void) {
4006 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
4007 fatal("Could not disable polling page");
4008 }
4009 };
4010
4011 // Mark the polling page as readable
4012 void os::make_polling_page_readable(void) {
4013 // Changed according to os_linux.cpp.
4014 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
4015 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
4016 }
4017 };
4018
4019 int os::active_processor_count() {
4020 // User has overridden the number of active processors
4021 if (ActiveProcessorCount > 0) {
4022 if (PrintActiveCpus) {
4023 tty->print_cr("active_processor_count: "
4024 "active processor count set by user : %d",
4025 ActiveProcessorCount);
4026 }
4027 return ActiveProcessorCount;
4028 }
4029
4030 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
4031 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
4032 return online_cpus;
4033 }
4034
4035 void os::set_native_thread_name(const char *name) {
4036 // Not yet implemented.
4037 return;
4038 }
4039
4040 bool os::distribute_processes(uint length, uint* distribution) {
4041 // Not yet implemented.
4042 return false;
4043 }
4044
4045 bool os::bind_to_processor(uint processor_id) {
4046 // Not yet implemented.
4047 return false;
4048 }
4049
4050 void os::SuspendedThreadTask::internal_do_task() {
4051 if (do_suspend(_thread->osthread())) {
4052 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
4053 do_task(context);
4054 do_resume(_thread->osthread());
4055 }
4056 }
4057
4058 class PcFetcher : public os::SuspendedThreadTask {
4059 public:
4060 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
4061 ExtendedPC result();
4062 protected:
4063 void do_task(const os::SuspendedThreadTaskContext& context);
4064 private:
4065 ExtendedPC _epc;
4066 };
4067
4068 ExtendedPC PcFetcher::result() {
4069 guarantee(is_done(), "task is not done yet.");
4070 return _epc;
4071 }
4072
4073 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
4074 Thread* thread = context.thread();
4075 OSThread* osthread = thread->osthread();
4076 if (osthread->ucontext() != NULL) {
4077 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
4078 } else {
4079 // NULL context is unexpected, double-check this is the VMThread.
4080 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
4081 }
4082 }
4083
4084 // Suspends the target using the signal mechanism and then grabs the PC before
4085 // resuming the target. Used by the flat-profiler only
4086 ExtendedPC os::get_thread_pc(Thread* thread) {
4087 // Make sure that it is called by the watcher for the VMThread.
4088 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
4089 assert(thread->is_VM_thread(), "Can only be called for VMThread");
4090
4091 PcFetcher fetcher(thread);
4092 fetcher.run();
4093 return fetcher.result();
4094 }
4095
4096 // Not neede on Aix.
4097 // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) {
4098 // }
4099
4100 ////////////////////////////////////////////////////////////////////////////////
4101 // debug support
4102
4103 static address same_page(address x, address y) {
4104 intptr_t page_bits = -os::vm_page_size();
4105 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
4106 return x;
4107 else if (x > y)
4108 return (address)(intptr_t(y) | ~page_bits) + 1;
4109 else
4110 return (address)(intptr_t(y) & page_bits);
4111 }
4112
4113 bool os::find(address addr, outputStream* st) {
4114
4115 st->print(PTR_FORMAT ": ", addr);
4116
4117 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
4118 if (lib) {
4119 lib->print(st);
4120 return true;
4121 } else {
4122 lib = LoadedLibraries::find_for_data_address(addr);
4123 if (lib) {
4124 lib->print(st);
4125 return true;
4126 } else {
4127 st->print_cr("(outside any module)");
4128 }
4129 }
4130
4131 return false;
4132 }
4133
4134 ////////////////////////////////////////////////////////////////////////////////
4135 // misc
4136
4137 // This does not do anything on Aix. This is basically a hook for being
4138 // able to use structured exception handling (thread-local exception filters)
4139 // on, e.g., Win32.
4140 void
4141 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
4142 JavaCallArguments* args, Thread* thread) {
4143 f(value, method, args, thread);
4144 }
4145
4146 void os::print_statistics() {
4147 }
4148
4149 int os::message_box(const char* title, const char* message) {
4150 int i;
4151 fdStream err(defaultStream::error_fd());
4152 for (i = 0; i < 78; i++) err.print_raw("=");
4153 err.cr();
4154 err.print_raw_cr(title);
4155 for (i = 0; i < 78; i++) err.print_raw("-");
4156 err.cr();
4157 err.print_raw_cr(message);
4158 for (i = 0; i < 78; i++) err.print_raw("=");
4159 err.cr();
4160
4161 char buf[16];
4162 // Prevent process from exiting upon "read error" without consuming all CPU
4163 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4164
4165 return buf[0] == 'y' || buf[0] == 'Y';
4166 }
4167
4168 int os::stat(const char *path, struct stat *sbuf) {
4169 char pathbuf[MAX_PATH];
4170 if (strlen(path) > MAX_PATH - 1) {
4171 errno = ENAMETOOLONG;
4172 return -1;
4173 }
4174 os::native_path(strcpy(pathbuf, path));
4175 return ::stat(pathbuf, sbuf);
4176 }
4177
4178 bool os::check_heap(bool force) {
4179 return true;
4180 }
4181
4182 // int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
4183 // return ::vsnprintf(buf, count, format, args);
4184 // }
4185
4186 // Is a (classpath) directory empty?
4187 bool os::dir_is_empty(const char* path) {
4188 DIR *dir = NULL;
4189 struct dirent *ptr;
4190
4191 dir = opendir(path);
4192 if (dir == NULL) return true;
4193
4194 /* Scan the directory */
4195 bool result = true;
4196 while (result && (ptr = readdir(dir)) != NULL) {
4197 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4198 result = false;
4199 }
4200 }
4201 closedir(dir);
4202 return result;
4203 }
4204
4205 // This code originates from JDK's sysOpen and open64_w
4206 // from src/solaris/hpi/src/system_md.c
4207
4208 #ifndef O_DELETE
4209 #define O_DELETE 0x10000
4210 #endif
4211
4212 // Open a file. Unlink the file immediately after open returns
4213 // if the specified oflag has the O_DELETE flag set.
4214 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
4215
4216 int os::open(const char *path, int oflag, int mode) {
4217
4218 if (strlen(path) > MAX_PATH - 1) {
4219 errno = ENAMETOOLONG;
4220 return -1;
4221 }
4222 int fd;
4223 int o_delete = (oflag & O_DELETE);
4224 oflag = oflag & ~O_DELETE;
4225
4226 fd = ::open64(path, oflag, mode);
4227 if (fd == -1) return -1;
4228
4229 // If the open succeeded, the file might still be a directory.
4230 {
4231 struct stat64 buf64;
4232 int ret = ::fstat64(fd, &buf64);
4233 int st_mode = buf64.st_mode;
4234
4235 if (ret != -1) {
4236 if ((st_mode & S_IFMT) == S_IFDIR) {
4237 errno = EISDIR;
4238 ::close(fd);
4239 return -1;
4240 }
4241 } else {
4242 ::close(fd);
4243 return -1;
4244 }
4245 }
4246
4247 // All file descriptors that are opened in the JVM and not
4248 // specifically destined for a subprocess should have the
4249 // close-on-exec flag set. If we don't set it, then careless 3rd
4250 // party native code might fork and exec without closing all
4251 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4252 // UNIXProcess.c), and this in turn might:
4253 //
4254 // - cause end-of-file to fail to be detected on some file
4255 // descriptors, resulting in mysterious hangs, or
4256 //
4257 // - might cause an fopen in the subprocess to fail on a system
4258 // suffering from bug 1085341.
4259 //
4260 // (Yes, the default setting of the close-on-exec flag is a Unix
4261 // design flaw.)
4262 //
4263 // See:
4264 // 1085341: 32-bit stdio routines should support file descriptors >255
4265 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4266 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4267 #ifdef FD_CLOEXEC
4268 {
4269 int flags = ::fcntl(fd, F_GETFD);
4270 if (flags != -1)
4271 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4272 }
4273 #endif
4274
4275 if (o_delete != 0) {
4276 ::unlink(path);
4277 }
4278 return fd;
4279 }
4280
4281 // create binary file, rewriting existing file if required
4282 int os::create_binary_file(const char* path, bool rewrite_existing) {
4283 int oflags = O_WRONLY | O_CREAT;
4284 if (!rewrite_existing) {
4285 oflags |= O_EXCL;
4286 }
4287 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4288 }
4289
4290 // return current position of file pointer
4291 jlong os::current_file_offset(int fd) {
4292 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4293 }
4294
4295 // move file pointer to the specified offset
4296 jlong os::seek_to_file_offset(int fd, jlong offset) {
4297 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4298 }
4299
4300 // This code originates from JDK's sysAvailable
4301 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4302
4303 int os::available(int fd, jlong *bytes) {
4304 jlong cur, end;
4305 int mode;
4306 struct stat64 buf64;
4307
4308 if (::fstat64(fd, &buf64) >= 0) {
4309 mode = buf64.st_mode;
4310 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4311 // XXX: is the following call interruptible? If so, this might
4312 // need to go through the INTERRUPT_IO() wrapper as for other
4313 // blocking, interruptible calls in this file.
4314 int n;
4315 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4316 *bytes = n;
4317 return 1;
4318 }
4319 }
4320 }
4321 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4322 return 0;
4323 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4324 return 0;
4325 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4326 return 0;
4327 }
4328 *bytes = end - cur;
4329 return 1;
4330 }
4331
4332 int os::socket_available(int fd, jint *pbytes) {
4333 // Linux doc says EINTR not returned, unlike Solaris
4334 int ret = ::ioctl(fd, FIONREAD, pbytes);
4335
4336 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
4337 // is expected to return 0 on failure and 1 on success to the jdk.
4338 return (ret < 0) ? 0 : 1;
4339 }
4340
4341 // Map a block of memory.
4342 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4343 char *addr, size_t bytes, bool read_only,
4344 bool allow_exec) {
4345 Unimplemented();
4346 return NULL;
4347 }
4348
4349 // Remap a block of memory.
4350 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4351 char *addr, size_t bytes, bool read_only,
4352 bool allow_exec) {
4353 // same as map_memory() on this OS
4354 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4355 allow_exec);
4356 }
4357
4358 // Unmap a block of memory.
4359 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4360 return munmap(addr, bytes) == 0;
4361 }
4362
4363 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4364 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4365 // of a thread.
4366 //
4367 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4368 // the fast estimate available on the platform.
4369
4370 jlong os::current_thread_cpu_time() {
4371 // return user + sys since the cost is the same
4372 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4373 assert(n >= 0, "negative CPU time");
4374 return n;
4375 }
4376
4377 jlong os::thread_cpu_time(Thread* thread) {
4378 // consistent with what current_thread_cpu_time() returns
4379 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4380 assert(n >= 0, "negative CPU time");
4381 return n;
4382 }
4383
4384 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4385 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4386 assert(n >= 0, "negative CPU time");
4387 return n;
4388 }
4389
4390 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4391 bool error = false;
4392
4393 jlong sys_time = 0;
4394 jlong user_time = 0;
4395
4396 // Reimplemented using getthrds64().
4397 //
4398 // Works like this:
4399 // For the thread in question, get the kernel thread id. Then get the
4400 // kernel thread statistics using that id.
4401 //
4402 // This only works of course when no pthread scheduling is used,
4403 // i.e. there is a 1:1 relationship to kernel threads.
4404 // On AIX, see AIXTHREAD_SCOPE variable.
4405
4406 pthread_t pthtid = thread->osthread()->pthread_id();
4407
4408 // retrieve kernel thread id for the pthread:
4409 tid64_t tid = 0;
4410 struct __pthrdsinfo pinfo;
4411 // I just love those otherworldly IBM APIs which force me to hand down
4412 // dummy buffers for stuff I dont care for...
4413 char dummy[1];
4414 int dummy_size = sizeof(dummy);
4415 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4416 dummy, &dummy_size) == 0) {
4417 tid = pinfo.__pi_tid;
4418 } else {
4419 tty->print_cr("pthread_getthrds_np failed.");
4420 error = true;
4421 }
4422
4423 // retrieve kernel timing info for that kernel thread
4424 if (!error) {
4425 struct thrdentry64 thrdentry;
4426 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4427 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4428 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4429 } else {
4430 tty->print_cr("pthread_getthrds_np failed.");
4431 error = true;
4432 }
4433 }
4434
4435 if (p_sys_time) {
4436 *p_sys_time = sys_time;
4437 }
4438
4439 if (p_user_time) {
4440 *p_user_time = user_time;
4441 }
4442
4443 if (error) {
4444 return false;
4445 }
4446
4447 return true;
4448 }
4449
4450 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4451 jlong sys_time;
4452 jlong user_time;
4453
4454 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4455 return -1;
4456 }
4457
4458 return user_sys_cpu_time ? sys_time + user_time : user_time;
4459 }
4460
4461 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4462 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4463 info_ptr->may_skip_backward = false; // elapsed time not wall time
4464 info_ptr->may_skip_forward = false; // elapsed time not wall time
4465 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4466 }
4467
4468 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4469 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4470 info_ptr->may_skip_backward = false; // elapsed time not wall time
4471 info_ptr->may_skip_forward = false; // elapsed time not wall time
4472 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4473 }
4474
4475 bool os::is_thread_cpu_time_supported() {
4476 return true;
4477 }
4478
4479 // System loadavg support. Returns -1 if load average cannot be obtained.
4480 // For now just return the system wide load average (no processor sets).
4481 int os::loadavg(double values[], int nelem) {
4482
4483 // Implemented using libperfstat on AIX.
4484
4485 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4486 guarantee(values, "argument error");
4487
4488 if (os::Aix::on_pase()) {
4489 Unimplemented();
4490 return -1;
4491 } else {
4492 // AIX: use libperfstat
4493 //
4494 // See also:
4495 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4496 // /usr/include/libperfstat.h:
4497
4498 // Use the already AIX version independent get_cpuinfo.
4499 os::Aix::cpuinfo_t ci;
4500 if (os::Aix::get_cpuinfo(&ci)) {
4501 for (int i = 0; i < nelem; i++) {
4502 values[i] = ci.loadavg[i];
4503 }
4504 } else {
4505 return -1;
4506 }
4507 return nelem;
4508 }
4509 }
4510
4511 void os::pause() {
4512 char filename[MAX_PATH];
4513 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4514 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4515 } else {
4516 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4517 }
4518
4519 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4520 if (fd != -1) {
4521 struct stat buf;
4522 ::close(fd);
4523 while (::stat(filename, &buf) == 0) {
4524 (void)::poll(NULL, 0, 100);
4525 }
4526 } else {
4527 jio_fprintf(stderr,
4528 "Could not open pause file '%s', continuing immediately.\n", filename);
4529 }
4530 }
4531
4532 bool os::is_primordial_thread(void) {
4533 if (pthread_self() == (pthread_t)1) {
4534 return true;
4535 } else {
4536 return false;
4537 }
4538 }
4539
4540 // OS recognitions (PASE/AIX, OS level) call this before calling any
4541 // one of Aix::on_pase(), Aix::os_version() static
4542 void os::Aix::initialize_os_info() {
4543
4544 assert(_on_pase == -1 && _os_version == -1, "already called.");
4545
4546 struct utsname uts;
4547 memset(&uts, 0, sizeof(uts));
4548 strcpy(uts.sysname, "?");
4549 if (::uname(&uts) == -1) {
4550 trc("uname failed (%d)", errno);
4551 guarantee(0, "Could not determine whether we run on AIX or PASE");
4552 } else {
4553 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4554 "node \"%s\" machine \"%s\"\n",
4555 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4556 const int major = atoi(uts.version);
4557 assert(major > 0, "invalid OS version");
4558 const int minor = atoi(uts.release);
4559 assert(minor > 0, "invalid OS release");
4560 _os_version = (major << 8) | minor;
4561 if (strcmp(uts.sysname, "OS400") == 0) {
4562 Unimplemented();
4563 } else if (strcmp(uts.sysname, "AIX") == 0) {
4564 // We run on AIX. We do not support versions older than AIX 5.3.
4565 _on_pase = 0;
4566 if (_os_version < 0x0503) {
4567 trc("AIX release older than AIX 5.3 not supported.");
4568 assert(false, "AIX release too old.");
4569 } else {
4570 trcVerbose("We run on AIX %d.%d\n", major, minor);
4571 }
4572 } else {
4573 assert(false, "unknown OS");
4574 }
4575 }
4576
4577 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4578 } // end: os::Aix::initialize_os_info()
4579
4580 // Scan environment for important settings which might effect the VM.
4581 // Trace out settings. Warn about invalid settings and/or correct them.
4582 //
4583 // Must run after os::Aix::initialue_os_info().
4584 void os::Aix::scan_environment() {
4585
4586 char* p;
4587 int rc;
4588
4589 // Warn explicity if EXTSHM=ON is used. That switch changes how
4590 // System V shared memory behaves. One effect is that page size of
4591 // shared memory cannot be change dynamically, effectivly preventing
4592 // large pages from working.
4593 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4594 // recommendation is (in OSS notes) to switch it off.
4595 p = ::getenv("EXTSHM");
4596 if (Verbose) {
4597 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4598 }
4599 if (p && strcmp(p, "ON") == 0) {
4600 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4601 _extshm = 1;
4602 } else {
4603 _extshm = 0;
4604 }
4605
4606 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4607 // Not tested, not supported.
4608 //
4609 // Note that it might be worth the trouble to test and to require it, if only to
4610 // get useful return codes for mprotect.
4611 //
4612 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4613 // exec() ? before loading the libjvm ? ....)
4614 p = ::getenv("XPG_SUS_ENV");
4615 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4616 if (p && strcmp(p, "ON") == 0) {
4617 _xpg_sus_mode = 1;
4618 trc("Unsupported setting: XPG_SUS_ENV=ON");
4619 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4620 // clobber address ranges. If we ever want to support that, we have to do some
4621 // testing first.
4622 guarantee(false, "XPG_SUS_ENV=ON not supported");
4623 } else {
4624 _xpg_sus_mode = 0;
4625 }
4626
4627 // Switch off AIX internal (pthread) guard pages. This has
4628 // immediate effect for any pthread_create calls which follow.
4629 p = ::getenv("AIXTHREAD_GUARDPAGES");
4630 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4631 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4632 guarantee(rc == 0, "");
4633
4634 } // end: os::Aix::scan_environment()
4635
4636 // PASE: initialize the libo4 library (AS400 PASE porting library).
4637 void os::Aix::initialize_libo4() {
4638 Unimplemented();
4639 }
4640
4641 // AIX: initialize the libperfstat library (we load this dynamically
4642 // because it is only available on AIX.
4643 void os::Aix::initialize_libperfstat() {
4644
4645 assert(os::Aix::on_aix(), "AIX only");
4646
4647 if (!libperfstat::init()) {
4648 trc("libperfstat initialization failed.");
4649 assert(false, "libperfstat initialization failed");
4650 } else {
4651 if (Verbose) {
4652 fprintf(stderr, "libperfstat initialized.\n");
4653 }
4654 }
4655 } // end: os::Aix::initialize_libperfstat
4656
4657 /////////////////////////////////////////////////////////////////////////////
4658 // thread stack
4659
4660 // function to query the current stack size using pthread_getthrds_np
4661 //
4662 // ! do not change anything here unless you know what you are doing !
4663 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4664
4665 // This only works when invoked on a pthread. As we agreed not to use
4666 // primordial threads anyway, I assert here
4667 guarantee(!os::is_primordial_thread(), "not allowed on the primordial thread");
4668
4669 // information about this api can be found (a) in the pthread.h header and
4670 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4671 //
4672 // The use of this API to find out the current stack is kind of undefined.
4673 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4674 // enough for cases where I let the pthread library create its stacks. For cases
4675 // where I create an own stack and pass this to pthread_create, it seems not to
4676 // work (the returned stack size in that case is 0).
4677
4678 pthread_t tid = pthread_self();
4679 struct __pthrdsinfo pinfo;
4680 char dummy[1]; // we only need this to satisfy the api and to not get E
4681 int dummy_size = sizeof(dummy);
4682
4683 memset(&pinfo, 0, sizeof(pinfo));
4684
4685 const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4686 sizeof(pinfo), dummy, &dummy_size);
4687
4688 if (rc != 0) {
4689 fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc);
4690 guarantee(0, "pthread_getthrds_np failed");
4691 }
4692
4693 guarantee(pinfo.__pi_stackend, "returned stack base invalid");
4694
4695 // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack
4696 // (when handing down a stack to pthread create, see pthread_attr_setstackaddr).
4697 // Not sure what to do here - I feel inclined to forbid this use case completely.
4698 guarantee(pinfo.__pi_stacksize, "returned stack size invalid");
4699
4700 // On AIX, stacks are not necessarily page aligned so round the base and size accordingly
4701 if (p_stack_base) {
4702 (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size());
4703 }
4704
4705 if (p_stack_size) {
4706 (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size();
4707 }
4708
4709 #ifndef PRODUCT
4710 if (Verbose) {
4711 fprintf(stderr,
4712 "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT
4713 ", real stack_size=" INTPTR_FORMAT
4714 ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n",
4715 (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize,
4716 (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()),
4717 pinfo.__pi_stacksize - os::Aix::stack_page_size());
4718 }
4719 #endif
4720
4721 } // end query_stack_dimensions
4722
4723 // get the current stack base from the OS (actually, the pthread library)
4724 address os::current_stack_base() {
4725 address p;
4726 query_stack_dimensions(&p, 0);
4727 return p;
4728 }
4729
4730 // get the current stack size from the OS (actually, the pthread library)
4731 size_t os::current_stack_size() {
4732 size_t s;
4733 query_stack_dimensions(0, &s);
4734 return s;
4735 }
4736
4737 // Refer to the comments in os_solaris.cpp park-unpark.
4738 //
4739 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4740 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4741 // For specifics regarding the bug see GLIBC BUGID 261237 :
4742 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4743 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4744 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4745 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4746 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4747 // and monitorenter when we're using 1-0 locking. All those operations may result in
4748 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4749 // of libpthread avoids the problem, but isn't practical.
4750 //
4751 // Possible remedies:
4752 //
4753 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4754 // This is palliative and probabilistic, however. If the thread is preempted
4755 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4756 // than the minimum period may have passed, and the abstime may be stale (in the
4757 // past) resultin in a hang. Using this technique reduces the odds of a hang
4758 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4759 //
4760 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4761 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4762 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4763 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4764 // thread.
4765 //
4766 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4767 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4768 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4769 // This also works well. In fact it avoids kernel-level scalability impediments
4770 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4771 // timers in a graceful fashion.
4772 //
4773 // 4. When the abstime value is in the past it appears that control returns
4774 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4775 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4776 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4777 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4778 // It may be possible to avoid reinitialization by checking the return
4779 // value from pthread_cond_timedwait(). In addition to reinitializing the
4780 // condvar we must establish the invariant that cond_signal() is only called
4781 // within critical sections protected by the adjunct mutex. This prevents
4782 // cond_signal() from "seeing" a condvar that's in the midst of being
4783 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4784 // desirable signal-after-unlock optimization that avoids futile context switching.
4785 //
4786 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4787 // structure when a condvar is used or initialized. cond_destroy() would
4788 // release the helper structure. Our reinitialize-after-timedwait fix
4789 // put excessive stress on malloc/free and locks protecting the c-heap.
4790 //
4791 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4792 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4793 // and only enabling the work-around for vulnerable environments.
4794
4795 // utility to compute the abstime argument to timedwait:
4796 // millis is the relative timeout time
4797 // abstime will be the absolute timeout time
4798 // TODO: replace compute_abstime() with unpackTime()
4799
4800 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4801 if (millis < 0) millis = 0;
4802 struct timeval now;
4803 int status = gettimeofday(&now, NULL);
4804 assert(status == 0, "gettimeofday");
4805 jlong seconds = millis / 1000;
4806 millis %= 1000;
4807 if (seconds > 50000000) { // see man cond_timedwait(3T)
4808 seconds = 50000000;
4809 }
4810 abstime->tv_sec = now.tv_sec + seconds;
4811 long usec = now.tv_usec + millis * 1000;
4812 if (usec >= 1000000) {
4813 abstime->tv_sec += 1;
4814 usec -= 1000000;
4815 }
4816 abstime->tv_nsec = usec * 1000;
4817 return abstime;
4818 }
4819
4820 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4821 // Conceptually TryPark() should be equivalent to park(0).
4822
4823 int os::PlatformEvent::TryPark() {
4824 for (;;) {
4825 const int v = _Event;
4826 guarantee ((v == 0) || (v == 1), "invariant");
4827 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4828 }
4829 }
4830
4831 void os::PlatformEvent::park() { // AKA "down()"
4832 // Invariant: Only the thread associated with the Event/PlatformEvent
4833 // may call park().
4834 // TODO: assert that _Assoc != NULL or _Assoc == Self
4835 int v;
4836 for (;;) {
4837 v = _Event;
4838 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4839 }
4840 guarantee (v >= 0, "invariant");
4841 if (v == 0) {
4842 // Do this the hard way by blocking ...
4843 int status = pthread_mutex_lock(_mutex);
4844 assert_status(status == 0, status, "mutex_lock");
4845 guarantee (_nParked == 0, "invariant");
4846 ++ _nParked;
4847 while (_Event < 0) {
4848 status = pthread_cond_wait(_cond, _mutex);
4849 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4850 }
4851 -- _nParked;
4852
4853 // In theory we could move the ST of 0 into _Event past the unlock(),
4854 // but then we'd need a MEMBAR after the ST.
4855 _Event = 0;
4856 status = pthread_mutex_unlock(_mutex);
4857 assert_status(status == 0, status, "mutex_unlock");
4858 }
4859 guarantee (_Event >= 0, "invariant");
4860 }
4861
4862 int os::PlatformEvent::park(jlong millis) {
4863 guarantee (_nParked == 0, "invariant");
4864
4865 int v;
4866 for (;;) {
4867 v = _Event;
4868 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4869 }
4870 guarantee (v >= 0, "invariant");
4871 if (v != 0) return OS_OK;
4872
4873 // We do this the hard way, by blocking the thread.
4874 // Consider enforcing a minimum timeout value.
4875 struct timespec abst;
4876 compute_abstime(&abst, millis);
4877
4878 int ret = OS_TIMEOUT;
4879 int status = pthread_mutex_lock(_mutex);
4880 assert_status(status == 0, status, "mutex_lock");
4881 guarantee (_nParked == 0, "invariant");
4882 ++_nParked;
4883
4884 // Object.wait(timo) will return because of
4885 // (a) notification
4886 // (b) timeout
4887 // (c) thread.interrupt
4888 //
4889 // Thread.interrupt and object.notify{All} both call Event::set.
4890 // That is, we treat thread.interrupt as a special case of notification.
4891 // The underlying Solaris implementation, cond_timedwait, admits
4892 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4893 // JVM from making those visible to Java code. As such, we must
4894 // filter out spurious wakeups. We assume all ETIME returns are valid.
4895 //
4896 // TODO: properly differentiate simultaneous notify+interrupt.
4897 // In that case, we should propagate the notify to another waiter.
4898
4899 while (_Event < 0) {
4900 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4901 assert_status(status == 0 || status == ETIMEDOUT,
4902 status, "cond_timedwait");
4903 if (!FilterSpuriousWakeups) break; // previous semantics
4904 if (status == ETIMEDOUT) break;
4905 // We consume and ignore EINTR and spurious wakeups.
4906 }
4907 --_nParked;
4908 if (_Event >= 0) {
4909 ret = OS_OK;
4910 }
4911 _Event = 0;
4912 status = pthread_mutex_unlock(_mutex);
4913 assert_status(status == 0, status, "mutex_unlock");
4914 assert (_nParked == 0, "invariant");
4915 return ret;
4916 }
4917
4918 void os::PlatformEvent::unpark() {
4919 int v, AnyWaiters;
4920 for (;;) {
4921 v = _Event;
4922 if (v > 0) {
4923 // The LD of _Event could have reordered or be satisfied
4924 // by a read-aside from this processor's write buffer.
4925 // To avoid problems execute a barrier and then
4926 // ratify the value.
4927 OrderAccess::fence();
4928 if (_Event == v) return;
4929 continue;
4930 }
4931 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4932 }
4933 if (v < 0) {
4934 // Wait for the thread associated with the event to vacate
4935 int status = pthread_mutex_lock(_mutex);
4936 assert_status(status == 0, status, "mutex_lock");
4937 AnyWaiters = _nParked;
4938
4939 if (AnyWaiters != 0) {
4940 // We intentional signal *after* dropping the lock
4941 // to avoid a common class of futile wakeups.
4942 status = pthread_cond_signal(_cond);
4943 assert_status(status == 0, status, "cond_signal");
4944 }
4945 // Mutex should be locked for pthread_cond_signal(_cond).
4946 status = pthread_mutex_unlock(_mutex);
4947 assert_status(status == 0, status, "mutex_unlock");
4948 }
4949
4950 // Note that we signal() _after dropping the lock for "immortal" Events.
4951 // This is safe and avoids a common class of futile wakeups. In rare
4952 // circumstances this can cause a thread to return prematurely from
4953 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4954 // simply re-test the condition and re-park itself.
4955 }
4956
4957
4958 // JSR166
4959 // -------------------------------------------------------
4960
4961 //
4962 // The solaris and linux implementations of park/unpark are fairly
4963 // conservative for now, but can be improved. They currently use a
4964 // mutex/condvar pair, plus a a count.
4965 // Park decrements count if > 0, else does a condvar wait. Unpark
4966 // sets count to 1 and signals condvar. Only one thread ever waits
4967 // on the condvar. Contention seen when trying to park implies that someone
4968 // is unparking you, so don't wait. And spurious returns are fine, so there
4969 // is no need to track notifications.
4970 //
4971
4972 #define MAX_SECS 100000000
4973 //
4974 // This code is common to linux and solaris and will be moved to a
4975 // common place in dolphin.
4976 //
4977 // The passed in time value is either a relative time in nanoseconds
4978 // or an absolute time in milliseconds. Either way it has to be unpacked
4979 // into suitable seconds and nanoseconds components and stored in the
4980 // given timespec structure.
4981 // Given time is a 64-bit value and the time_t used in the timespec is only
4982 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4983 // overflow if times way in the future are given. Further on Solaris versions
4984 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4985 // number of seconds, in abstime, is less than current_time + 100,000,000.
4986 // As it will be 28 years before "now + 100000000" will overflow we can
4987 // ignore overflow and just impose a hard-limit on seconds using the value
4988 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4989 // years from "now".
4990 //
4991
4992 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4993 assert (time > 0, "convertTime");
4994
4995 struct timeval now;
4996 int status = gettimeofday(&now, NULL);
4997 assert(status == 0, "gettimeofday");
4998
4999 time_t max_secs = now.tv_sec + MAX_SECS;
5000
5001 if (isAbsolute) {
5002 jlong secs = time / 1000;
5003 if (secs > max_secs) {
5004 absTime->tv_sec = max_secs;
5005 }
5006 else {
5007 absTime->tv_sec = secs;
5008 }
5009 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
5010 }
5011 else {
5012 jlong secs = time / NANOSECS_PER_SEC;
5013 if (secs >= MAX_SECS) {
5014 absTime->tv_sec = max_secs;
5015 absTime->tv_nsec = 0;
5016 }
5017 else {
5018 absTime->tv_sec = now.tv_sec + secs;
5019 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
5020 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
5021 absTime->tv_nsec -= NANOSECS_PER_SEC;
5022 ++absTime->tv_sec; // note: this must be <= max_secs
5023 }
5024 }
5025 }
5026 assert(absTime->tv_sec >= 0, "tv_sec < 0");
5027 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
5028 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
5029 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
5030 }
5031
5032 void Parker::park(bool isAbsolute, jlong time) {
5033 // Optional fast-path check:
5034 // Return immediately if a permit is available.
5035 if (_counter > 0) {
5036 _counter = 0;
5037 OrderAccess::fence();
5038 return;
5039 }
5040
5041 Thread* thread = Thread::current();
5042 assert(thread->is_Java_thread(), "Must be JavaThread");
5043 JavaThread *jt = (JavaThread *)thread;
5044
5045 // Optional optimization -- avoid state transitions if there's an interrupt pending.
5046 // Check interrupt before trying to wait
5047 if (Thread::is_interrupted(thread, false)) {
5048 return;
5049 }
5050
5051 // Next, demultiplex/decode time arguments
5052 timespec absTime;
5053 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
5054 return;
5055 }
5056 if (time > 0) {
5057 unpackTime(&absTime, isAbsolute, time);
5058 }
5059
5060 // Enter safepoint region
5061 // Beware of deadlocks such as 6317397.
5062 // The per-thread Parker:: mutex is a classic leaf-lock.
5063 // In particular a thread must never block on the Threads_lock while
5064 // holding the Parker:: mutex. If safepoints are pending both the
5065 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
5066 ThreadBlockInVM tbivm(jt);
5067
5068 // Don't wait if cannot get lock since interference arises from
5069 // unblocking. Also. check interrupt before trying wait
5070 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
5071 return;
5072 }
5073
5074 int status;
5075 if (_counter > 0) { // no wait needed
5076 _counter = 0;
5077 status = pthread_mutex_unlock(_mutex);
5078 assert (status == 0, "invariant");
5079 OrderAccess::fence();
5080 return;
5081 }
5082
5083 #ifdef ASSERT
5084 // Don't catch signals while blocked; let the running threads have the signals.
5085 // (This allows a debugger to break into the running thread.)
5086 sigset_t oldsigs;
5087 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
5088 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
5089 #endif
5090
5091 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
5092 jt->set_suspend_equivalent();
5093 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
5094
5095 if (time == 0) {
5096 status = pthread_cond_wait (_cond, _mutex);
5097 } else {
5098 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
5099 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
5100 pthread_cond_destroy (_cond);
5101 pthread_cond_init (_cond, NULL);
5102 }
5103 }
5104 assert_status(status == 0 || status == EINTR ||
5105 status == ETIME || status == ETIMEDOUT,
5106 status, "cond_timedwait");
5107
5108 #ifdef ASSERT
5109 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
5110 #endif
5111
5112 _counter = 0;
5113 status = pthread_mutex_unlock(_mutex);
5114 assert_status(status == 0, status, "invariant");
5115 // If externally suspended while waiting, re-suspend
5116 if (jt->handle_special_suspend_equivalent_condition()) {
5117 jt->java_suspend_self();
5118 }
5119
5120 OrderAccess::fence();
5121 }
5122
5123 void Parker::unpark() {
5124 int s, status;
5125 status = pthread_mutex_lock(_mutex);
5126 assert (status == 0, "invariant");
5127 s = _counter;
5128 _counter = 1;
5129 if (s < 1) {
5130 if (WorkAroundNPTLTimedWaitHang) {
5131 status = pthread_cond_signal (_cond);
5132 assert (status == 0, "invariant");
5133 status = pthread_mutex_unlock(_mutex);
5134 assert (status == 0, "invariant");
5135 } else {
5136 status = pthread_mutex_unlock(_mutex);
5137 assert (status == 0, "invariant");
5138 status = pthread_cond_signal (_cond);
5139 assert (status == 0, "invariant");
5140 }
5141 } else {
5142 pthread_mutex_unlock(_mutex);
5143 assert (status == 0, "invariant");
5144 }
5145 }
5146
5147 extern char** environ;
5148
5149 // Run the specified command in a separate process. Return its exit value,
5150 // or -1 on failure (e.g. can't fork a new process).
5151 // Unlike system(), this function can be called from signal handler. It
5152 // doesn't block SIGINT et al.
5153 int os::fork_and_exec(char* cmd) {
5154 char * argv[4] = {"sh", "-c", cmd, NULL};
5155
5156 pid_t pid = fork();
5157
5158 if (pid < 0) {
5159 // fork failed
5160 return -1;
5161
5162 } else if (pid == 0) {
5163 // child process
5164
5165 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
5166 execve("/usr/bin/sh", argv, environ);
5167
5168 // execve failed
5169 _exit(-1);
5170
5171 } else {
5172 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5173 // care about the actual exit code, for now.
5174
5175 int status;
5176
5177 // Wait for the child process to exit. This returns immediately if
5178 // the child has already exited. */
5179 while (waitpid(pid, &status, 0) < 0) {
5180 switch (errno) {
5181 case ECHILD: return 0;
5182 case EINTR: break;
5183 default: return -1;
5184 }
5185 }
5186
5187 if (WIFEXITED(status)) {
5188 // The child exited normally; get its exit code.
5189 return WEXITSTATUS(status);
5190 } else if (WIFSIGNALED(status)) {
5191 // The child exited because of a signal.
5192 // The best value to return is 0x80 + signal number,
5193 // because that is what all Unix shells do, and because
5194 // it allows callers to distinguish between process exit and
5195 // process death by signal.
5196 return 0x80 + WTERMSIG(status);
5197 } else {
5198 // Unknown exit code; pass it through.
5199 return status;
5200 }
5201 }
5202 return -1;
5203 }
5204
5205 // is_headless_jre()
5206 //
5207 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5208 // in order to report if we are running in a headless jre.
5209 //
5210 // Since JDK8 xawt/libmawt.so is moved into the same directory
5211 // as libawt.so, and renamed libawt_xawt.so
5212 bool os::is_headless_jre() {
5213 struct stat statbuf;
5214 char buf[MAXPATHLEN];
5215 char libmawtpath[MAXPATHLEN];
5216 const char *xawtstr = "/xawt/libmawt.so";
5217 const char *new_xawtstr = "/libawt_xawt.so";
5218
5219 char *p;
5220
5221 // Get path to libjvm.so
5222 os::jvm_path(buf, sizeof(buf));
5223
5224 // Get rid of libjvm.so
5225 p = strrchr(buf, '/');
5226 if (p == NULL) return false;
5227 else *p = '\0';
5228
5229 // Get rid of client or server
5230 p = strrchr(buf, '/');
5231 if (p == NULL) return false;
5232 else *p = '\0';
5233
5234 // check xawt/libmawt.so
5235 strcpy(libmawtpath, buf);
5236 strcat(libmawtpath, xawtstr);
5237 if (::stat(libmawtpath, &statbuf) == 0) return false;
5238
5239 // check libawt_xawt.so
5240 strcpy(libmawtpath, buf);
5241 strcat(libmawtpath, new_xawtstr);
5242 if (::stat(libmawtpath, &statbuf) == 0) return false;
5243
5244 return true;
5245 }
5246
5247 // Get the default path to the core file
5248 // Returns the length of the string
5249 int os::get_core_path(char* buffer, size_t bufferSize) {
5250 const char* p = get_current_directory(buffer, bufferSize);
5251
5252 if (p == NULL) {
5253 assert(p != NULL, "failed to get current directory");
5254 return 0;
5255 }
5256
5257 return strlen(buffer);
5258 }
5259
5260 #ifndef PRODUCT
5261 void TestReserveMemorySpecial_test() {
5262 // No tests available for this platform
5263 }
5264 #endif