1 /*
2 * Copyright (c) 1999, 2015, 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_aix.inline.hpp"
46 #include "os_share_aix.hpp"
47 #include "porting_aix.hpp"
48 #include "prims/jniFastGetField.hpp"
49 #include "prims/jvm.h"
50 #include "prims/jvm_misc.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/atomic.inline.hpp"
53 #include "runtime/extendedPC.hpp"
54 #include "runtime/globals.hpp"
55 #include "runtime/interfaceSupport.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/mutexLocker.hpp"
59 #include "runtime/objectMonitor.hpp"
60 #include "runtime/orderAccess.inline.hpp"
61 #include "runtime/os.hpp"
62 #include "runtime/osThread.hpp"
63 #include "runtime/perfMemory.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/statSampler.hpp"
66 #include "runtime/stubRoutines.hpp"
67 #include "runtime/thread.inline.hpp"
68 #include "runtime/threadCritical.hpp"
69 #include "runtime/timer.hpp"
70 #include "runtime/vm_version.hpp"
71 #include "services/attachListener.hpp"
72 #include "services/runtimeService.hpp"
73 #include "utilities/decoder.hpp"
74 #include "utilities/defaultStream.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/vmError.hpp"
78
79 // put OS-includes here (sorted alphabetically)
80 #include <errno.h>
81 #include <fcntl.h>
82 #include <inttypes.h>
83 #include <poll.h>
84 #include <procinfo.h>
85 #include <pthread.h>
86 #include <pwd.h>
87 #include <semaphore.h>
88 #include <signal.h>
89 #include <stdint.h>
90 #include <stdio.h>
91 #include <string.h>
92 #include <unistd.h>
93 #include <sys/ioctl.h>
94 #include <sys/ipc.h>
95 #include <sys/mman.h>
96 #include <sys/resource.h>
97 #include <sys/select.h>
98 #include <sys/shm.h>
99 #include <sys/socket.h>
100 #include <sys/stat.h>
101 #include <sys/sysinfo.h>
102 #include <sys/systemcfg.h>
103 #include <sys/time.h>
104 #include <sys/times.h>
105 #include <sys/types.h>
106 #include <sys/utsname.h>
107 #include <sys/vminfo.h>
108 #include <sys/wait.h>
109
110 // If RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling
111 // getrusage() is prepared to handle the associated failure.
112 #ifndef RUSAGE_THREAD
113 #define RUSAGE_THREAD (1) /* only the calling thread */
114 #endif
115
116 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
117 #if !defined(_AIXVERSION_610)
118 extern "C" {
119 int getthrds64(pid_t ProcessIdentifier,
120 struct thrdentry64* ThreadBuffer,
121 int ThreadSize,
122 tid64_t* IndexPointer,
123 int Count);
124 }
125 #endif
126
127 #define MAX_PATH (2 * K)
128
129 // for timer info max values which include all bits
130 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
131 // for multipage initialization error analysis (in 'g_multipage_error')
132 #define ERROR_MP_OS_TOO_OLD 100
133 #define ERROR_MP_EXTSHM_ACTIVE 101
134 #define ERROR_MP_VMGETINFO_FAILED 102
135 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
136
137 // The semantics in this file are thus that codeptr_t is a *real code ptr*.
138 // This means that any function taking codeptr_t as arguments will assume
139 // a real codeptr and won't handle function descriptors (eg getFuncName),
140 // whereas functions taking address as args will deal with function
141 // descriptors (eg os::dll_address_to_library_name).
142 typedef unsigned int* codeptr_t;
143
144 // Typedefs for stackslots, stack pointers, pointers to op codes.
145 typedef unsigned long stackslot_t;
146 typedef stackslot_t* stackptr_t;
147
148 // Excerpts from systemcfg.h definitions newer than AIX 5.3.
149 #ifndef PV_7
150 #define PV_7 0x200000 /* Power PC 7 */
151 #define PV_7_Compat 0x208000 /* Power PC 7 */
152 #endif
153 #ifndef PV_8
154 #define PV_8 0x300000 /* Power PC 8 */
155 #define PV_8_Compat 0x308000 /* Power PC 8 */
156 #endif
157
158 #define trcVerbose(fmt, ...) { /* PPC port */ \
159 if (Verbose) { \
160 fprintf(stderr, fmt, ##__VA_ARGS__); \
161 fputc('\n', stderr); fflush(stderr); \
162 } \
163 }
164 #define trc(fmt, ...) /* PPC port */
165
166 #define ERRBYE(s) { \
167 trcVerbose(s); \
168 return -1; \
169 }
170
171 // query dimensions of the stack of the calling thread
172 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
173
174 // function to check a given stack pointer against given stack limits
175 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
176 if (((uintptr_t)sp) & 0x7) {
177 return false;
178 }
179 if (sp > stack_base) {
180 return false;
181 }
182 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
183 return false;
184 }
185 return true;
186 }
187
188 // returns true if function is a valid codepointer
189 inline bool is_valid_codepointer(codeptr_t p) {
190 if (!p) {
191 return false;
192 }
193 if (((uintptr_t)p) & 0x3) {
194 return false;
195 }
196 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
197 return false;
198 }
199 return true;
200 }
201
202 // Macro to check a given stack pointer against given stack limits and to die if test fails.
203 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
204 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
205 }
206
207 // Macro to check the current stack pointer against given stacklimits.
208 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
209 address sp; \
210 sp = os::current_stack_pointer(); \
211 CHECK_STACK_PTR(sp, stack_base, stack_size); \
212 }
213
214 ////////////////////////////////////////////////////////////////////////////////
215 // global variables (for a description see os_aix.hpp)
216
217 julong os::Aix::_physical_memory = 0;
218 pthread_t os::Aix::_main_thread = ((pthread_t)0);
219 int os::Aix::_page_size = -1;
220 int os::Aix::_on_pase = -1;
221 int os::Aix::_os_version = -1;
222 int os::Aix::_stack_page_size = -1;
223 size_t os::Aix::_shm_default_page_size = -1;
224 int os::Aix::_can_use_64K_pages = -1;
225 int os::Aix::_can_use_16M_pages = -1;
226 int os::Aix::_xpg_sus_mode = -1;
227 int os::Aix::_extshm = -1;
228 int os::Aix::_logical_cpus = -1;
229
230 ////////////////////////////////////////////////////////////////////////////////
231 // local variables
232
233 static int g_multipage_error = -1; // error analysis for multipage initialization
234 static jlong initial_time_count = 0;
235 static int clock_tics_per_sec = 100;
236 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
237 static bool check_signals = true;
238 static pid_t _initial_pid = 0;
239 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
240 static sigset_t SR_sigset;
241 static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls.
242
243 julong os::available_memory() {
244 return Aix::available_memory();
245 }
246
247 julong os::Aix::available_memory() {
248 os::Aix::meminfo_t mi;
249 if (os::Aix::get_meminfo(&mi)) {
250 return mi.real_free;
251 } else {
252 return 0xFFFFFFFFFFFFFFFFLL;
253 }
254 }
255
256 julong os::physical_memory() {
257 return Aix::physical_memory();
258 }
259
260 ////////////////////////////////////////////////////////////////////////////////
261 // environment support
262
263 bool os::getenv(const char* name, char* buf, int len) {
264 const char* val = ::getenv(name);
265 if (val != NULL && strlen(val) < (size_t)len) {
266 strcpy(buf, val);
267 return true;
268 }
269 if (len > 0) buf[0] = 0; // return a null string
270 return false;
271 }
272
273 // Return true if user is running as root.
274
275 bool os::have_special_privileges() {
276 static bool init = false;
277 static bool privileges = false;
278 if (!init) {
279 privileges = (getuid() != geteuid()) || (getgid() != getegid());
280 init = true;
281 }
282 return privileges;
283 }
284
285 // Helper function, emulates disclaim64 using multiple 32bit disclaims
286 // because we cannot use disclaim64() on AS/400 and old AIX releases.
287 static bool my_disclaim64(char* addr, size_t size) {
288
289 if (size == 0) {
290 return true;
291 }
292
293 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
294 const unsigned int maxDisclaimSize = 0x80000000;
295
296 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
297 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
298
299 char* p = addr;
300
301 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
302 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
303 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
304 return false;
305 }
306 p += maxDisclaimSize;
307 }
308
309 if (lastDisclaimSize > 0) {
310 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
311 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
312 return false;
313 }
314 }
315
316 return true;
317 }
318
319 // Cpu architecture string
320 #if defined(PPC32)
321 static char cpu_arch[] = "ppc";
322 #elif defined(PPC64)
323 static char cpu_arch[] = "ppc64";
324 #else
325 #error Add appropriate cpu_arch setting
326 #endif
327
328
329 // Given an address, returns the size of the page backing that address.
330 size_t os::Aix::query_pagesize(void* addr) {
331
332 vm_page_info pi;
333 pi.addr = (uint64_t)addr;
334 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
335 return pi.pagesize;
336 } else {
337 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
338 assert(false, "vmgetinfo failed to retrieve page size");
339 return SIZE_4K;
340 }
341
342 }
343
344 // Returns the kernel thread id of the currently running thread.
345 pid_t os::Aix::gettid() {
346 return (pid_t) thread_self();
347 }
348
349 void os::Aix::initialize_system_info() {
350
351 // Get the number of online(logical) cpus instead of configured.
352 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
353 assert(_processor_count > 0, "_processor_count must be > 0");
354
355 // Retrieve total physical storage.
356 os::Aix::meminfo_t mi;
357 if (!os::Aix::get_meminfo(&mi)) {
358 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
359 assert(false, "os::Aix::get_meminfo failed.");
360 }
361 _physical_memory = (julong) mi.real_total;
362 }
363
364 // Helper function for tracing page sizes.
365 static const char* describe_pagesize(size_t pagesize) {
366 switch (pagesize) {
367 case SIZE_4K : return "4K";
368 case SIZE_64K: return "64K";
369 case SIZE_16M: return "16M";
370 case SIZE_16G: return "16G";
371 default:
372 assert(false, "surprise");
373 return "??";
374 }
375 }
376
377 // Retrieve information about multipage size support. Will initialize
378 // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages,
379 // Aix::_can_use_16M_pages.
380 // Must be called before calling os::large_page_init().
381 void os::Aix::query_multipage_support() {
382
383 guarantee(_page_size == -1 &&
384 _stack_page_size == -1 &&
385 _can_use_64K_pages == -1 &&
386 _can_use_16M_pages == -1 &&
387 g_multipage_error == -1,
388 "do not call twice");
389
390 _page_size = ::sysconf(_SC_PAGESIZE);
391
392 // This really would surprise me.
393 assert(_page_size == SIZE_4K, "surprise!");
394
395
396 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
397 // Default data page size is influenced either by linker options (-bdatapsize)
398 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
399 // default should be 4K.
400 size_t data_page_size = SIZE_4K;
401 {
402 void* p = os::malloc(SIZE_16M, mtInternal);
403 guarantee(p != NULL, "malloc failed");
404 data_page_size = os::Aix::query_pagesize(p);
405 os::free(p);
406 }
407
408 // query default shm page size (LDR_CNTRL SHMPSIZE)
409 {
410 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
411 guarantee(shmid != -1, "shmget failed");
412 void* p = ::shmat(shmid, NULL, 0);
413 ::shmctl(shmid, IPC_RMID, NULL);
414 guarantee(p != (void*) -1, "shmat failed");
415 _shm_default_page_size = os::Aix::query_pagesize(p);
416 ::shmdt(p);
417 }
418
419 // before querying the stack page size, make sure we are not running as primordial
420 // thread (because primordial thread's stack may have different page size than
421 // pthread thread stacks). Running a VM on the primordial thread won't work for a
422 // number of reasons so we may just as well guarantee it here
423 guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread");
424
425 // query stack page size
426 {
427 int dummy = 0;
428 _stack_page_size = os::Aix::query_pagesize(&dummy);
429 // everything else would surprise me and should be looked into
430 guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size");
431 // also, just for completeness: pthread stacks are allocated from C heap, so
432 // stack page size should be the same as data page size
433 guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size");
434 }
435
436 // EXTSHM is bad: among other things, it prevents setting pagesize dynamically
437 // for system V shm.
438 if (Aix::extshm()) {
439 if (Verbose) {
440 fprintf(stderr, "EXTSHM is active - will disable large page support.\n"
441 "Please make sure EXTSHM is OFF for large page support.\n");
442 }
443 g_multipage_error = ERROR_MP_EXTSHM_ACTIVE;
444 _can_use_64K_pages = _can_use_16M_pages = 0;
445 goto query_multipage_support_end;
446 }
447
448 // now check which page sizes the OS claims it supports, and of those, which actually can be used.
449 {
450 const int MAX_PAGE_SIZES = 4;
451 psize_t sizes[MAX_PAGE_SIZES];
452 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
453 if (num_psizes == -1) {
454 if (Verbose) {
455 fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
456 fprintf(stderr, "disabling multipage support.\n");
457 }
458 g_multipage_error = ERROR_MP_VMGETINFO_FAILED;
459 _can_use_64K_pages = _can_use_16M_pages = 0;
460 goto query_multipage_support_end;
461 }
462 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
463 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
464 if (Verbose) {
465 fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
466 for (int i = 0; i < num_psizes; i ++) {
467 fprintf(stderr, " %s ", describe_pagesize(sizes[i]));
468 }
469 fprintf(stderr, " .\n");
470 }
471
472 // Can we use 64K, 16M pages?
473 _can_use_64K_pages = 0;
474 _can_use_16M_pages = 0;
475 for (int i = 0; i < num_psizes; i ++) {
476 if (sizes[i] == SIZE_64K) {
477 _can_use_64K_pages = 1;
478 } else if (sizes[i] == SIZE_16M) {
479 _can_use_16M_pages = 1;
480 }
481 }
482
483 if (!_can_use_64K_pages) {
484 g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K;
485 }
486
487 // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages,
488 // there must be an actual 16M page pool, and we must run with enough rights.
489 if (_can_use_16M_pages) {
490 const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR);
491 guarantee(shmid != -1, "shmget failed");
492 struct shmid_ds shm_buf = { 0 };
493 shm_buf.shm_pagesize = SIZE_16M;
494 const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false;
495 const int en = errno;
496 ::shmctl(shmid, IPC_RMID, NULL);
497 if (!can_set_pagesize) {
498 if (Verbose) {
499 fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n"
500 "Will deactivate 16M support.\n", en, strerror(en));
501 }
502 _can_use_16M_pages = 0;
503 }
504 }
505
506 } // end: check which pages can be used for shared memory
507
508 query_multipage_support_end:
509
510 guarantee(_page_size != -1 &&
511 _stack_page_size != -1 &&
512 _can_use_64K_pages != -1 &&
513 _can_use_16M_pages != -1, "Page sizes not properly initialized");
514
515 if (_can_use_64K_pages) {
516 g_multipage_error = 0;
517 }
518
519 if (Verbose) {
520 fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size));
521 fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size));
522 fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size));
523 fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no"));
524 fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no"));
525 fprintf(stderr, "Multipage error details: %d\n", g_multipage_error);
526 }
527
528 } // end os::Aix::query_multipage_support()
529
530 void os::init_system_properties_values() {
531
532 #define DEFAULT_LIBPATH "/usr/lib:/lib"
533 #define EXTENSIONS_DIR "/lib/ext"
534
535 // Buffer that fits several sprintfs.
536 // Note that the space for the trailing null is provided
537 // by the nulls included by the sizeof operator.
538 const size_t bufsize =
539 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
540 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
541 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
542
543 // sysclasspath, java_home, dll_dir
544 {
545 char *pslash;
546 os::jvm_path(buf, bufsize);
547
548 // Found the full path to libjvm.so.
549 // Now cut the path to <java_home>/jre if we can.
550 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
551 pslash = strrchr(buf, '/');
552 if (pslash != NULL) {
553 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
554 }
555 Arguments::set_dll_dir(buf);
556
557 if (pslash != NULL) {
558 pslash = strrchr(buf, '/');
559 if (pslash != NULL) {
560 *pslash = '\0'; // Get rid of /<arch>.
561 pslash = strrchr(buf, '/');
562 if (pslash != NULL) {
563 *pslash = '\0'; // Get rid of /lib.
564 }
565 }
566 }
567 Arguments::set_java_home(buf);
568 set_boot_path('/', ':');
569 }
570
571 // Where to look for native libraries.
572
573 // On Aix we get the user setting of LIBPATH.
574 // Eventually, all the library path setting will be done here.
575 // Get the user setting of LIBPATH.
576 const char *v = ::getenv("LIBPATH");
577 const char *v_colon = ":";
578 if (v == NULL) { v = ""; v_colon = ""; }
579
580 // Concatenate user and invariant part of ld_library_path.
581 // That's +1 for the colon and +1 for the trailing '\0'.
582 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
583 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
584 Arguments::set_library_path(ld_library_path);
585 FREE_C_HEAP_ARRAY(char, ld_library_path);
586
587 // Extensions directories.
588 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
589 Arguments::set_ext_dirs(buf);
590
591 FREE_C_HEAP_ARRAY(char, buf);
592
593 #undef DEFAULT_LIBPATH
594 #undef EXTENSIONS_DIR
595 }
596
597 ////////////////////////////////////////////////////////////////////////////////
598 // breakpoint support
599
600 void os::breakpoint() {
601 BREAKPOINT;
602 }
603
604 extern "C" void breakpoint() {
605 // use debugger to set breakpoint here
606 }
607
608 ////////////////////////////////////////////////////////////////////////////////
609 // signal support
610
611 debug_only(static bool signal_sets_initialized = false);
612 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
613
614 bool os::Aix::is_sig_ignored(int sig) {
615 struct sigaction oact;
616 sigaction(sig, (struct sigaction*)NULL, &oact);
617 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
618 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
619 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
620 return true;
621 } else {
622 return false;
623 }
624 }
625
626 void os::Aix::signal_sets_init() {
627 // Should also have an assertion stating we are still single-threaded.
628 assert(!signal_sets_initialized, "Already initialized");
629 // Fill in signals that are necessarily unblocked for all threads in
630 // the VM. Currently, we unblock the following signals:
631 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
632 // by -Xrs (=ReduceSignalUsage));
633 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
634 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
635 // the dispositions or masks wrt these signals.
636 // Programs embedding the VM that want to use the above signals for their
637 // own purposes must, at this time, use the "-Xrs" option to prevent
638 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
639 // (See bug 4345157, and other related bugs).
640 // In reality, though, unblocking these signals is really a nop, since
641 // these signals are not blocked by default.
642 sigemptyset(&unblocked_sigs);
643 sigemptyset(&allowdebug_blocked_sigs);
644 sigaddset(&unblocked_sigs, SIGILL);
645 sigaddset(&unblocked_sigs, SIGSEGV);
646 sigaddset(&unblocked_sigs, SIGBUS);
647 sigaddset(&unblocked_sigs, SIGFPE);
648 sigaddset(&unblocked_sigs, SIGTRAP);
649 sigaddset(&unblocked_sigs, SIGDANGER);
650 sigaddset(&unblocked_sigs, SR_signum);
651
652 if (!ReduceSignalUsage) {
653 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
654 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
655 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
656 }
657 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
658 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
659 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
660 }
661 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
662 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
663 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
664 }
665 }
666 // Fill in signals that are blocked by all but the VM thread.
667 sigemptyset(&vm_sigs);
668 if (!ReduceSignalUsage)
669 sigaddset(&vm_sigs, BREAK_SIGNAL);
670 debug_only(signal_sets_initialized = true);
671 }
672
673 // These are signals that are unblocked while a thread is running Java.
674 // (For some reason, they get blocked by default.)
675 sigset_t* os::Aix::unblocked_signals() {
676 assert(signal_sets_initialized, "Not initialized");
677 return &unblocked_sigs;
678 }
679
680 // These are the signals that are blocked while a (non-VM) thread is
681 // running Java. Only the VM thread handles these signals.
682 sigset_t* os::Aix::vm_signals() {
683 assert(signal_sets_initialized, "Not initialized");
684 return &vm_sigs;
685 }
686
687 // These are signals that are blocked during cond_wait to allow debugger in
688 sigset_t* os::Aix::allowdebug_blocked_signals() {
689 assert(signal_sets_initialized, "Not initialized");
690 return &allowdebug_blocked_sigs;
691 }
692
693 void os::Aix::hotspot_sigmask(Thread* thread) {
694
695 //Save caller's signal mask before setting VM signal mask
696 sigset_t caller_sigmask;
697 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
698
699 OSThread* osthread = thread->osthread();
700 osthread->set_caller_sigmask(caller_sigmask);
701
702 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
703
704 if (!ReduceSignalUsage) {
705 if (thread->is_VM_thread()) {
706 // Only the VM thread handles BREAK_SIGNAL ...
707 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
708 } else {
709 // ... all other threads block BREAK_SIGNAL
710 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
711 }
712 }
713 }
714
715 // retrieve memory information.
716 // Returns false if something went wrong;
717 // content of pmi undefined in this case.
718 bool os::Aix::get_meminfo(meminfo_t* pmi) {
719
720 assert(pmi, "get_meminfo: invalid parameter");
721
722 memset(pmi, 0, sizeof(meminfo_t));
723
724 if (os::Aix::on_pase()) {
725
726 Unimplemented();
727 return false;
728
729 } else {
730
731 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
732 // See:
733 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
734 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
735 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
736 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
737
738 perfstat_memory_total_t psmt;
739 memset (&psmt, '\0', sizeof(psmt));
740 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
741 if (rc == -1) {
742 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
743 assert(0, "perfstat_memory_total() failed");
744 return false;
745 }
746
747 assert(rc == 1, "perfstat_memory_total() - weird return code");
748
749 // excerpt from
750 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
751 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
752 // The fields of perfstat_memory_total_t:
753 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
754 // u_longlong_t real_total Total real memory (in 4 KB pages).
755 // u_longlong_t real_free Free real memory (in 4 KB pages).
756 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
757 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
758
759 pmi->virt_total = psmt.virt_total * 4096;
760 pmi->real_total = psmt.real_total * 4096;
761 pmi->real_free = psmt.real_free * 4096;
762 pmi->pgsp_total = psmt.pgsp_total * 4096;
763 pmi->pgsp_free = psmt.pgsp_free * 4096;
764
765 return true;
766
767 }
768 } // end os::Aix::get_meminfo
769
770 // Retrieve global cpu information.
771 // Returns false if something went wrong;
772 // the content of pci is undefined in this case.
773 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
774 assert(pci, "get_cpuinfo: invalid parameter");
775 memset(pci, 0, sizeof(cpuinfo_t));
776
777 perfstat_cpu_total_t psct;
778 memset (&psct, '\0', sizeof(psct));
779
780 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
781 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
782 assert(0, "perfstat_cpu_total() failed");
783 return false;
784 }
785
786 // global cpu information
787 strcpy (pci->description, psct.description);
788 pci->processorHZ = psct.processorHZ;
789 pci->ncpus = psct.ncpus;
790 os::Aix::_logical_cpus = psct.ncpus;
791 for (int i = 0; i < 3; i++) {
792 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
793 }
794
795 // get the processor version from _system_configuration
796 switch (_system_configuration.version) {
797 case PV_8:
798 strcpy(pci->version, "Power PC 8");
799 break;
800 case PV_7:
801 strcpy(pci->version, "Power PC 7");
802 break;
803 case PV_6_1:
804 strcpy(pci->version, "Power PC 6 DD1.x");
805 break;
806 case PV_6:
807 strcpy(pci->version, "Power PC 6");
808 break;
809 case PV_5:
810 strcpy(pci->version, "Power PC 5");
811 break;
812 case PV_5_2:
813 strcpy(pci->version, "Power PC 5_2");
814 break;
815 case PV_5_3:
816 strcpy(pci->version, "Power PC 5_3");
817 break;
818 case PV_5_Compat:
819 strcpy(pci->version, "PV_5_Compat");
820 break;
821 case PV_6_Compat:
822 strcpy(pci->version, "PV_6_Compat");
823 break;
824 case PV_7_Compat:
825 strcpy(pci->version, "PV_7_Compat");
826 break;
827 case PV_8_Compat:
828 strcpy(pci->version, "PV_8_Compat");
829 break;
830 default:
831 strcpy(pci->version, "unknown");
832 }
833
834 return true;
835
836 } //end os::Aix::get_cpuinfo
837
838 //////////////////////////////////////////////////////////////////////////////
839 // detecting pthread library
840
841 void os::Aix::libpthread_init() {
842 return;
843 }
844
845 //////////////////////////////////////////////////////////////////////////////
846 // create new thread
847
848 // Thread start routine for all newly created threads
849 static void *java_start(Thread *thread) {
850
851 // find out my own stack dimensions
852 {
853 // actually, this should do exactly the same as thread->record_stack_base_and_size...
854 address base = 0;
855 size_t size = 0;
856 query_stack_dimensions(&base, &size);
857 thread->set_stack_base(base);
858 thread->set_stack_size(size);
859 }
860
861 // Do some sanity checks.
862 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
863
864 // Try to randomize the cache line index of hot stack frames.
865 // This helps when threads of the same stack traces evict each other's
866 // cache lines. The threads can be either from the same JVM instance, or
867 // from different JVM instances. The benefit is especially true for
868 // processors with hyperthreading technology.
869
870 static int counter = 0;
871 int pid = os::current_process_id();
872 alloca(((pid ^ counter++) & 7) * 128);
873
874 ThreadLocalStorage::set_thread(thread);
875
876 OSThread* osthread = thread->osthread();
877
878 // thread_id is kernel thread id (similar to Solaris LWP id)
879 osthread->set_thread_id(os::Aix::gettid());
880
881 // initialize signal mask for this thread
882 os::Aix::hotspot_sigmask(thread);
883
884 // initialize floating point control register
885 os::Aix::init_thread_fpu_state();
886
887 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
888
889 // call one more level start routine
890 thread->run();
891
892 return 0;
893 }
894
895 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
896
897 // We want the whole function to be synchronized.
898 ThreadCritical cs;
899
900 assert(thread->osthread() == NULL, "caller responsible");
901
902 // Allocate the OSThread object
903 OSThread* osthread = new OSThread(NULL, NULL);
904 if (osthread == NULL) {
905 return false;
906 }
907
908 // set the correct thread state
909 osthread->set_thread_type(thr_type);
910
911 // Initial state is ALLOCATED but not INITIALIZED
912 osthread->set_state(ALLOCATED);
913
914 thread->set_osthread(osthread);
915
916 // init thread attributes
917 pthread_attr_t attr;
918 pthread_attr_init(&attr);
919 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
920
921 // Make sure we run in 1:1 kernel-user-thread mode.
922 if (os::Aix::on_aix()) {
923 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
924 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
925 } // end: aix
926
927 // Start in suspended state, and in os::thread_start, wake the thread up.
928 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
929
930 // calculate stack size if it's not specified by caller
931 if (os::Aix::supports_variable_stack_size()) {
932 if (stack_size == 0) {
933 stack_size = os::Aix::default_stack_size(thr_type);
934
935 switch (thr_type) {
936 case os::java_thread:
937 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
938 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
939 stack_size = JavaThread::stack_size_at_create();
940 break;
941 case os::compiler_thread:
942 if (CompilerThreadStackSize > 0) {
943 stack_size = (size_t)(CompilerThreadStackSize * K);
944 break;
945 } // else fall through:
946 // use VMThreadStackSize if CompilerThreadStackSize is not defined
947 case os::vm_thread:
948 case os::pgc_thread:
949 case os::cgc_thread:
950 case os::watcher_thread:
951 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
952 break;
953 }
954 }
955
956 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
957 pthread_attr_setstacksize(&attr, stack_size);
958 } //else let thread_create() pick the default value (96 K on AIX)
959
960 pthread_t tid;
961 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
962
963 pthread_attr_destroy(&attr);
964
965 if (ret == 0) {
966 // PPC port traceOsMisc(("Created New Thread : pthread-id %u", tid));
967 } else {
968 if (PrintMiscellaneous && (Verbose || WizardMode)) {
969 perror("pthread_create()");
970 }
971 // Need to clean up stuff we've allocated so far
972 thread->set_osthread(NULL);
973 delete osthread;
974 return false;
975 }
976
977 // Store pthread info into the OSThread
978 osthread->set_pthread_id(tid);
979
980 return true;
981 }
982
983 /////////////////////////////////////////////////////////////////////////////
984 // attach existing thread
985
986 // bootstrap the main thread
987 bool os::create_main_thread(JavaThread* thread) {
988 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
989 return create_attached_thread(thread);
990 }
991
992 bool os::create_attached_thread(JavaThread* thread) {
993 #ifdef ASSERT
994 thread->verify_not_published();
995 #endif
996
997 // Allocate the OSThread object
998 OSThread* osthread = new OSThread(NULL, NULL);
999
1000 if (osthread == NULL) {
1001 return false;
1002 }
1003
1004 // Store pthread info into the OSThread
1005 osthread->set_thread_id(os::Aix::gettid());
1006 osthread->set_pthread_id(::pthread_self());
1007
1008 // initialize floating point control register
1009 os::Aix::init_thread_fpu_state();
1010
1011 // some sanity checks
1012 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
1013
1014 // Initial thread state is RUNNABLE
1015 osthread->set_state(RUNNABLE);
1016
1017 thread->set_osthread(osthread);
1018
1019 if (UseNUMA) {
1020 int lgrp_id = os::numa_get_group_id();
1021 if (lgrp_id != -1) {
1022 thread->set_lgrp_id(lgrp_id);
1023 }
1024 }
1025
1026 // initialize signal mask for this thread
1027 // and save the caller's signal mask
1028 os::Aix::hotspot_sigmask(thread);
1029
1030 return true;
1031 }
1032
1033 void os::pd_start_thread(Thread* thread) {
1034 int status = pthread_continue_np(thread->osthread()->pthread_id());
1035 assert(status == 0, "thr_continue failed");
1036 }
1037
1038 // Free OS resources related to the OSThread
1039 void os::free_thread(OSThread* osthread) {
1040 assert(osthread != NULL, "osthread not set");
1041
1042 if (Thread::current()->osthread() == osthread) {
1043 // Restore caller's signal mask
1044 sigset_t sigmask = osthread->caller_sigmask();
1045 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1046 }
1047
1048 delete osthread;
1049 }
1050
1051 //////////////////////////////////////////////////////////////////////////////
1052 // thread local storage
1053
1054 int os::allocate_thread_local_storage() {
1055 pthread_key_t key;
1056 int rslt = pthread_key_create(&key, NULL);
1057 assert(rslt == 0, "cannot allocate thread local storage");
1058 return (int)key;
1059 }
1060
1061 // Note: This is currently not used by VM, as we don't destroy TLS key
1062 // on VM exit.
1063 void os::free_thread_local_storage(int index) {
1064 int rslt = pthread_key_delete((pthread_key_t)index);
1065 assert(rslt == 0, "invalid index");
1066 }
1067
1068 void os::thread_local_storage_at_put(int index, void* value) {
1069 int rslt = pthread_setspecific((pthread_key_t)index, value);
1070 assert(rslt == 0, "pthread_setspecific failed");
1071 }
1072
1073 extern "C" Thread* get_thread() {
1074 return ThreadLocalStorage::thread();
1075 }
1076
1077 ////////////////////////////////////////////////////////////////////////////////
1078 // time support
1079
1080 // Time since start-up in seconds to a fine granularity.
1081 // Used by VMSelfDestructTimer and the MemProfiler.
1082 double os::elapsedTime() {
1083 return (double)(os::elapsed_counter()) * 0.000001;
1084 }
1085
1086 jlong os::elapsed_counter() {
1087 timeval time;
1088 int status = gettimeofday(&time, NULL);
1089 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1090 }
1091
1092 jlong os::elapsed_frequency() {
1093 return (1000 * 1000);
1094 }
1095
1096 bool os::supports_vtime() { return true; }
1097 bool os::enable_vtime() { return false; }
1098 bool os::vtime_enabled() { return false; }
1099
1100 double os::elapsedVTime() {
1101 struct rusage usage;
1102 int retval = getrusage(RUSAGE_THREAD, &usage);
1103 if (retval == 0) {
1104 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1105 } else {
1106 // better than nothing, but not much
1107 return elapsedTime();
1108 }
1109 }
1110
1111 jlong os::javaTimeMillis() {
1112 timeval time;
1113 int status = gettimeofday(&time, NULL);
1114 assert(status != -1, "aix error at gettimeofday()");
1115 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1116 }
1117
1118 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1119 timeval time;
1120 int status = gettimeofday(&time, NULL);
1121 assert(status != -1, "aix error at gettimeofday()");
1122 seconds = jlong(time.tv_sec);
1123 nanos = jlong(time.tv_usec) * 1000;
1124 }
1125
1126
1127 // We need to manually declare mread_real_time,
1128 // because IBM didn't provide a prototype in time.h.
1129 // (they probably only ever tested in C, not C++)
1130 extern "C"
1131 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1132
1133 jlong os::javaTimeNanos() {
1134 if (os::Aix::on_pase()) {
1135 Unimplemented();
1136 return 0;
1137 } else {
1138 // On AIX use the precision of processors real time clock
1139 // or time base registers.
1140 timebasestruct_t time;
1141 int rc;
1142
1143 // If the CPU has a time register, it will be used and
1144 // we have to convert to real time first. After convertion we have following data:
1145 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1146 // time.tb_low [nanoseconds after the last full second above]
1147 // We better use mread_real_time here instead of read_real_time
1148 // to ensure that we will get a monotonic increasing time.
1149 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1150 rc = time_base_to_time(&time, TIMEBASE_SZ);
1151 assert(rc != -1, "aix error at time_base_to_time()");
1152 }
1153 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1154 }
1155 }
1156
1157 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1158 info_ptr->max_value = ALL_64_BITS;
1159 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1160 info_ptr->may_skip_backward = false;
1161 info_ptr->may_skip_forward = false;
1162 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1163 }
1164
1165 // Return the real, user, and system times in seconds from an
1166 // arbitrary fixed point in the past.
1167 bool os::getTimesSecs(double* process_real_time,
1168 double* process_user_time,
1169 double* process_system_time) {
1170 struct tms ticks;
1171 clock_t real_ticks = times(&ticks);
1172
1173 if (real_ticks == (clock_t) (-1)) {
1174 return false;
1175 } else {
1176 double ticks_per_second = (double) clock_tics_per_sec;
1177 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1178 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1179 *process_real_time = ((double) real_ticks) / ticks_per_second;
1180
1181 return true;
1182 }
1183 }
1184
1185 char * os::local_time_string(char *buf, size_t buflen) {
1186 struct tm t;
1187 time_t long_time;
1188 time(&long_time);
1189 localtime_r(&long_time, &t);
1190 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1191 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1192 t.tm_hour, t.tm_min, t.tm_sec);
1193 return buf;
1194 }
1195
1196 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1197 return localtime_r(clock, res);
1198 }
1199
1200 ////////////////////////////////////////////////////////////////////////////////
1201 // runtime exit support
1202
1203 // Note: os::shutdown() might be called very early during initialization, or
1204 // called from signal handler. Before adding something to os::shutdown(), make
1205 // sure it is async-safe and can handle partially initialized VM.
1206 void os::shutdown() {
1207
1208 // allow PerfMemory to attempt cleanup of any persistent resources
1209 perfMemory_exit();
1210
1211 // needs to remove object in file system
1212 AttachListener::abort();
1213
1214 // flush buffered output, finish log files
1215 ostream_abort();
1216
1217 // Check for abort hook
1218 abort_hook_t abort_hook = Arguments::abort_hook();
1219 if (abort_hook != NULL) {
1220 abort_hook();
1221 }
1222 }
1223
1224 // Note: os::abort() might be called very early during initialization, or
1225 // called from signal handler. Before adding something to os::abort(), make
1226 // sure it is async-safe and can handle partially initialized VM.
1227 void os::abort(bool dump_core) {
1228 os::shutdown();
1229 if (dump_core) {
1230 #ifndef PRODUCT
1231 fdStream out(defaultStream::output_fd());
1232 out.print_raw("Current thread is ");
1233 char buf[16];
1234 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1235 out.print_raw_cr(buf);
1236 out.print_raw_cr("Dumping core ...");
1237 #endif
1238 ::abort(); // dump core
1239 }
1240
1241 ::exit(1);
1242 }
1243
1244 // Die immediately, no exit hook, no abort hook, no cleanup.
1245 void os::die() {
1246 ::abort();
1247 }
1248
1249 // This method is a copy of JDK's sysGetLastErrorString
1250 // from src/solaris/hpi/src/system_md.c
1251
1252 size_t os::lasterror(char *buf, size_t len) {
1253 if (errno == 0) return 0;
1254
1255 const char *s = ::strerror(errno);
1256 size_t n = ::strlen(s);
1257 if (n >= len) {
1258 n = len - 1;
1259 }
1260 ::strncpy(buf, s, n);
1261 buf[n] = '\0';
1262 return n;
1263 }
1264
1265 intx os::current_thread_id() { return (intx)pthread_self(); }
1266
1267 int os::current_process_id() {
1268
1269 // This implementation returns a unique pid, the pid of the
1270 // launcher thread that starts the vm 'process'.
1271
1272 // Under POSIX, getpid() returns the same pid as the
1273 // launcher thread rather than a unique pid per thread.
1274 // Use gettid() if you want the old pre NPTL behaviour.
1275
1276 // if you are looking for the result of a call to getpid() that
1277 // returns a unique pid for the calling thread, then look at the
1278 // OSThread::thread_id() method in osThread_linux.hpp file
1279
1280 return (int)(_initial_pid ? _initial_pid : getpid());
1281 }
1282
1283 // DLL functions
1284
1285 const char* os::dll_file_extension() { return ".so"; }
1286
1287 // This must be hard coded because it's the system's temporary
1288 // directory not the java application's temp directory, ala java.io.tmpdir.
1289 const char* os::get_temp_directory() { return "/tmp"; }
1290
1291 static bool file_exists(const char* filename) {
1292 struct stat statbuf;
1293 if (filename == NULL || strlen(filename) == 0) {
1294 return false;
1295 }
1296 return os::stat(filename, &statbuf) == 0;
1297 }
1298
1299 bool os::dll_build_name(char* buffer, size_t buflen,
1300 const char* pname, const char* fname) {
1301 bool retval = false;
1302 // Copied from libhpi
1303 const size_t pnamelen = pname ? strlen(pname) : 0;
1304
1305 // Return error on buffer overflow.
1306 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1307 *buffer = '\0';
1308 return retval;
1309 }
1310
1311 if (pnamelen == 0) {
1312 snprintf(buffer, buflen, "lib%s.so", fname);
1313 retval = true;
1314 } else if (strchr(pname, *os::path_separator()) != NULL) {
1315 int n;
1316 char** pelements = split_path(pname, &n);
1317 for (int i = 0; i < n; i++) {
1318 // Really shouldn't be NULL, but check can't hurt
1319 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1320 continue; // skip the empty path values
1321 }
1322 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1323 if (file_exists(buffer)) {
1324 retval = true;
1325 break;
1326 }
1327 }
1328 // release the storage
1329 for (int i = 0; i < n; i++) {
1330 if (pelements[i] != NULL) {
1331 FREE_C_HEAP_ARRAY(char, pelements[i]);
1332 }
1333 }
1334 if (pelements != NULL) {
1335 FREE_C_HEAP_ARRAY(char*, pelements);
1336 }
1337 } else {
1338 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1339 retval = true;
1340 }
1341 return retval;
1342 }
1343
1344 // Check if addr is inside libjvm.so.
1345 bool os::address_is_in_vm(address addr) {
1346
1347 // Input could be a real pc or a function pointer literal. The latter
1348 // would be a function descriptor residing in the data segment of a module.
1349
1350 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1351 if (lib) {
1352 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1353 return true;
1354 } else {
1355 return false;
1356 }
1357 } else {
1358 lib = LoadedLibraries::find_for_data_address(addr);
1359 if (lib) {
1360 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1361 return true;
1362 } else {
1363 return false;
1364 }
1365 } else {
1366 return false;
1367 }
1368 }
1369 }
1370
1371 // Resolve an AIX function descriptor literal to a code pointer.
1372 // If the input is a valid code pointer to a text segment of a loaded module,
1373 // it is returned unchanged.
1374 // If the input is a valid AIX function descriptor, it is resolved to the
1375 // code entry point.
1376 // If the input is neither a valid function descriptor nor a valid code pointer,
1377 // NULL is returned.
1378 static address resolve_function_descriptor_to_code_pointer(address p) {
1379
1380 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1381 if (lib) {
1382 // its a real code pointer
1383 return p;
1384 } else {
1385 lib = LoadedLibraries::find_for_data_address(p);
1386 if (lib) {
1387 // pointer to data segment, potential function descriptor
1388 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1389 if (LoadedLibraries::find_for_text_address(code_entry)) {
1390 // Its a function descriptor
1391 return code_entry;
1392 }
1393 }
1394 }
1395 return NULL;
1396 }
1397
1398 bool os::dll_address_to_function_name(address addr, char *buf,
1399 int buflen, int *offset) {
1400 if (offset) {
1401 *offset = -1;
1402 }
1403 // Buf is not optional, but offset is optional.
1404 assert(buf != NULL, "sanity check");
1405 buf[0] = '\0';
1406
1407 // Resolve function ptr literals first.
1408 addr = resolve_function_descriptor_to_code_pointer(addr);
1409 if (!addr) {
1410 return false;
1411 }
1412
1413 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1414 return Decoder::decode(addr, buf, buflen, offset);
1415 }
1416
1417 static int getModuleName(codeptr_t pc, // [in] program counter
1418 char* p_name, size_t namelen, // [out] optional: function name
1419 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1420 ) {
1421
1422 // initialize output parameters
1423 if (p_name && namelen > 0) {
1424 *p_name = '\0';
1425 }
1426 if (p_errmsg && errmsglen > 0) {
1427 *p_errmsg = '\0';
1428 }
1429
1430 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1431 if (lib) {
1432 if (p_name && namelen > 0) {
1433 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1434 }
1435 return 0;
1436 }
1437
1438 trcVerbose("pc outside any module");
1439
1440 return -1;
1441 }
1442
1443 bool os::dll_address_to_library_name(address addr, char* buf,
1444 int buflen, int* offset) {
1445 if (offset) {
1446 *offset = -1;
1447 }
1448 // Buf is not optional, but offset is optional.
1449 assert(buf != NULL, "sanity check");
1450 buf[0] = '\0';
1451
1452 // Resolve function ptr literals first.
1453 addr = resolve_function_descriptor_to_code_pointer(addr);
1454 if (!addr) {
1455 return false;
1456 }
1457
1458 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1459 return true;
1460 }
1461 return false;
1462 }
1463
1464 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1465 // for the same architecture as Hotspot is running on.
1466 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1467
1468 if (ebuf && ebuflen > 0) {
1469 ebuf[0] = '\0';
1470 ebuf[ebuflen - 1] = '\0';
1471 }
1472
1473 if (!filename || strlen(filename) == 0) {
1474 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1475 return NULL;
1476 }
1477
1478 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1479 void * result= ::dlopen(filename, RTLD_LAZY);
1480 if (result != NULL) {
1481 // Reload dll cache. Don't do this in signal handling.
1482 LoadedLibraries::reload();
1483 return result;
1484 } else {
1485 // error analysis when dlopen fails
1486 const char* const error_report = ::dlerror();
1487 if (error_report && ebuf && ebuflen > 0) {
1488 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1489 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1490 }
1491 }
1492 return NULL;
1493 }
1494
1495 // Glibc-2.0 libdl is not MT safe. If you are building with any glibc,
1496 // chances are you might want to run the generated bits against glibc-2.0
1497 // libdl.so, so always use locking for any version of glibc.
1498 void* os::dll_lookup(void* handle, const char* name) {
1499 pthread_mutex_lock(&dl_mutex);
1500 void* res = dlsym(handle, name);
1501 pthread_mutex_unlock(&dl_mutex);
1502 return res;
1503 }
1504
1505 void* os::get_default_process_handle() {
1506 return (void*)::dlopen(NULL, RTLD_LAZY);
1507 }
1508
1509 void os::print_dll_info(outputStream *st) {
1510 st->print_cr("Dynamic libraries:");
1511 LoadedLibraries::print(st);
1512 }
1513
1514 void os::print_os_info(outputStream* st) {
1515 st->print("OS:");
1516
1517 st->print("uname:");
1518 struct utsname name;
1519 uname(&name);
1520 st->print(name.sysname); st->print(" ");
1521 st->print(name.nodename); st->print(" ");
1522 st->print(name.release); st->print(" ");
1523 st->print(name.version); st->print(" ");
1524 st->print(name.machine);
1525 st->cr();
1526
1527 // rlimit
1528 st->print("rlimit:");
1529 struct rlimit rlim;
1530
1531 st->print(" STACK ");
1532 getrlimit(RLIMIT_STACK, &rlim);
1533 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1534 else st->print("%uk", rlim.rlim_cur >> 10);
1535
1536 st->print(", CORE ");
1537 getrlimit(RLIMIT_CORE, &rlim);
1538 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1539 else st->print("%uk", rlim.rlim_cur >> 10);
1540
1541 st->print(", NPROC ");
1542 st->print("%d", sysconf(_SC_CHILD_MAX));
1543
1544 st->print(", NOFILE ");
1545 getrlimit(RLIMIT_NOFILE, &rlim);
1546 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1547 else st->print("%d", rlim.rlim_cur);
1548
1549 st->print(", AS ");
1550 getrlimit(RLIMIT_AS, &rlim);
1551 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1552 else st->print("%uk", rlim.rlim_cur >> 10);
1553
1554 // Print limits on DATA, because it limits the C-heap.
1555 st->print(", DATA ");
1556 getrlimit(RLIMIT_DATA, &rlim);
1557 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1558 else st->print("%uk", rlim.rlim_cur >> 10);
1559 st->cr();
1560
1561 // load average
1562 st->print("load average:");
1563 double loadavg[3] = {-1.L, -1.L, -1.L};
1564 os::loadavg(loadavg, 3);
1565 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1566 st->cr();
1567 }
1568
1569 void os::print_memory_info(outputStream* st) {
1570
1571 st->print_cr("Memory:");
1572
1573 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1574 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1575 st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size()));
1576 st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no"));
1577 st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no"));
1578 if (g_multipage_error != 0) {
1579 st->print_cr(" multipage error: %d", g_multipage_error);
1580 }
1581
1582 // print out LDR_CNTRL because it affects the default page sizes
1583 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1584 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1585
1586 const char* const extshm = ::getenv("EXTSHM");
1587 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1588
1589 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1590 os::Aix::meminfo_t mi;
1591 if (os::Aix::get_meminfo(&mi)) {
1592 char buffer[256];
1593 if (os::Aix::on_aix()) {
1594 jio_snprintf(buffer, sizeof(buffer),
1595 " physical total : %llu\n"
1596 " physical free : %llu\n"
1597 " swap total : %llu\n"
1598 " swap free : %llu\n",
1599 mi.real_total,
1600 mi.real_free,
1601 mi.pgsp_total,
1602 mi.pgsp_free);
1603 } else {
1604 Unimplemented();
1605 }
1606 st->print_raw(buffer);
1607 } else {
1608 st->print_cr(" (no more information available)");
1609 }
1610 }
1611
1612 void os::pd_print_cpu_info(outputStream* st) {
1613 // cpu
1614 st->print("CPU:");
1615 st->print("total %d", os::processor_count());
1616 // It's not safe to query number of active processors after crash
1617 // st->print("(active %d)", os::active_processor_count());
1618 st->print(" %s", VM_Version::cpu_features());
1619 st->cr();
1620 }
1621
1622 void os::print_siginfo(outputStream* st, void* siginfo) {
1623 // Use common posix version.
1624 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1625 st->cr();
1626 }
1627
1628 static void print_signal_handler(outputStream* st, int sig,
1629 char* buf, size_t buflen);
1630
1631 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1632 st->print_cr("Signal Handlers:");
1633 print_signal_handler(st, SIGSEGV, buf, buflen);
1634 print_signal_handler(st, SIGBUS , buf, buflen);
1635 print_signal_handler(st, SIGFPE , buf, buflen);
1636 print_signal_handler(st, SIGPIPE, buf, buflen);
1637 print_signal_handler(st, SIGXFSZ, buf, buflen);
1638 print_signal_handler(st, SIGILL , buf, buflen);
1639 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1640 print_signal_handler(st, SR_signum, buf, buflen);
1641 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1642 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1643 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1644 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1645 print_signal_handler(st, SIGTRAP, buf, buflen);
1646 print_signal_handler(st, SIGDANGER, buf, buflen);
1647 }
1648
1649 static char saved_jvm_path[MAXPATHLEN] = {0};
1650
1651 // Find the full path to the current module, libjvm.so.
1652 void os::jvm_path(char *buf, jint buflen) {
1653 // Error checking.
1654 if (buflen < MAXPATHLEN) {
1655 assert(false, "must use a large-enough buffer");
1656 buf[0] = '\0';
1657 return;
1658 }
1659 // Lazy resolve the path to current module.
1660 if (saved_jvm_path[0] != 0) {
1661 strcpy(buf, saved_jvm_path);
1662 return;
1663 }
1664
1665 Dl_info dlinfo;
1666 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1667 assert(ret != 0, "cannot locate libjvm");
1668 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1669 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1670
1671 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1672 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1673 }
1674
1675 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1676 // no prefix required, not even "_"
1677 }
1678
1679 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1680 // no suffix required
1681 }
1682
1683 ////////////////////////////////////////////////////////////////////////////////
1684 // sun.misc.Signal support
1685
1686 static volatile jint sigint_count = 0;
1687
1688 static void
1689 UserHandler(int sig, void *siginfo, void *context) {
1690 // 4511530 - sem_post is serialized and handled by the manager thread. When
1691 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1692 // don't want to flood the manager thread with sem_post requests.
1693 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1694 return;
1695
1696 // Ctrl-C is pressed during error reporting, likely because the error
1697 // handler fails to abort. Let VM die immediately.
1698 if (sig == SIGINT && is_error_reported()) {
1699 os::die();
1700 }
1701
1702 os::signal_notify(sig);
1703 }
1704
1705 void* os::user_handler() {
1706 return CAST_FROM_FN_PTR(void*, UserHandler);
1707 }
1708
1709 extern "C" {
1710 typedef void (*sa_handler_t)(int);
1711 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1712 }
1713
1714 void* os::signal(int signal_number, void* handler) {
1715 struct sigaction sigAct, oldSigAct;
1716
1717 sigfillset(&(sigAct.sa_mask));
1718
1719 // Do not block out synchronous signals in the signal handler.
1720 // Blocking synchronous signals only makes sense if you can really
1721 // be sure that those signals won't happen during signal handling,
1722 // when the blocking applies. Normal signal handlers are lean and
1723 // do not cause signals. But our signal handlers tend to be "risky"
1724 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1725 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1726 // by a SIGILL, which was blocked due to the signal mask. The process
1727 // just hung forever. Better to crash from a secondary signal than to hang.
1728 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1729 sigdelset(&(sigAct.sa_mask), SIGBUS);
1730 sigdelset(&(sigAct.sa_mask), SIGILL);
1731 sigdelset(&(sigAct.sa_mask), SIGFPE);
1732 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1733
1734 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1735
1736 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1737
1738 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1739 // -1 means registration failed
1740 return (void *)-1;
1741 }
1742
1743 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1744 }
1745
1746 void os::signal_raise(int signal_number) {
1747 ::raise(signal_number);
1748 }
1749
1750 //
1751 // The following code is moved from os.cpp for making this
1752 // code platform specific, which it is by its very nature.
1753 //
1754
1755 // Will be modified when max signal is changed to be dynamic
1756 int os::sigexitnum_pd() {
1757 return NSIG;
1758 }
1759
1760 // a counter for each possible signal value
1761 static volatile jint pending_signals[NSIG+1] = { 0 };
1762
1763 // Linux(POSIX) specific hand shaking semaphore.
1764 static sem_t sig_sem;
1765
1766 void os::signal_init_pd() {
1767 // Initialize signal structures
1768 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1769
1770 // Initialize signal semaphore
1771 int rc = ::sem_init(&sig_sem, 0, 0);
1772 guarantee(rc != -1, "sem_init failed");
1773 }
1774
1775 void os::signal_notify(int sig) {
1776 Atomic::inc(&pending_signals[sig]);
1777 ::sem_post(&sig_sem);
1778 }
1779
1780 static int check_pending_signals(bool wait) {
1781 Atomic::store(0, &sigint_count);
1782 for (;;) {
1783 for (int i = 0; i < NSIG + 1; i++) {
1784 jint n = pending_signals[i];
1785 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1786 return i;
1787 }
1788 }
1789 if (!wait) {
1790 return -1;
1791 }
1792 JavaThread *thread = JavaThread::current();
1793 ThreadBlockInVM tbivm(thread);
1794
1795 bool threadIsSuspended;
1796 do {
1797 thread->set_suspend_equivalent();
1798 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1799
1800 ::sem_wait(&sig_sem);
1801
1802 // were we externally suspended while we were waiting?
1803 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1804 if (threadIsSuspended) {
1805 //
1806 // The semaphore has been incremented, but while we were waiting
1807 // another thread suspended us. We don't want to continue running
1808 // while suspended because that would surprise the thread that
1809 // suspended us.
1810 //
1811 ::sem_post(&sig_sem);
1812
1813 thread->java_suspend_self();
1814 }
1815 } while (threadIsSuspended);
1816 }
1817 }
1818
1819 int os::signal_lookup() {
1820 return check_pending_signals(false);
1821 }
1822
1823 int os::signal_wait() {
1824 return check_pending_signals(true);
1825 }
1826
1827 ////////////////////////////////////////////////////////////////////////////////
1828 // Virtual Memory
1829
1830 // AddrRange describes an immutable address range
1831 //
1832 // This is a helper class for the 'shared memory bookkeeping' below.
1833 class AddrRange {
1834 friend class ShmBkBlock;
1835
1836 char* _start;
1837 size_t _size;
1838
1839 public:
1840
1841 AddrRange(char* start, size_t size)
1842 : _start(start), _size(size)
1843 {}
1844
1845 AddrRange(const AddrRange& r)
1846 : _start(r.start()), _size(r.size())
1847 {}
1848
1849 char* start() const { return _start; }
1850 size_t size() const { return _size; }
1851 char* end() const { return _start + _size; }
1852 bool is_empty() const { return _size == 0 ? true : false; }
1853
1854 static AddrRange empty_range() { return AddrRange(NULL, 0); }
1855
1856 bool contains(const char* p) const {
1857 return start() <= p && end() > p;
1858 }
1859
1860 bool contains(const AddrRange& range) const {
1861 return start() <= range.start() && end() >= range.end();
1862 }
1863
1864 bool intersects(const AddrRange& range) const {
1865 return (range.start() <= start() && range.end() > start()) ||
1866 (range.start() < end() && range.end() >= end()) ||
1867 contains(range);
1868 }
1869
1870 bool is_same_range(const AddrRange& range) const {
1871 return start() == range.start() && size() == range.size();
1872 }
1873
1874 // return the closest inside range consisting of whole pages
1875 AddrRange find_closest_aligned_range(size_t pagesize) const {
1876 if (pagesize == 0 || is_empty()) {
1877 return empty_range();
1878 }
1879 char* const from = (char*)align_size_up((intptr_t)_start, pagesize);
1880 char* const to = (char*)align_size_down((intptr_t)end(), pagesize);
1881 if (from > to) {
1882 return empty_range();
1883 }
1884 return AddrRange(from, to - from);
1885 }
1886 };
1887
1888 ////////////////////////////////////////////////////////////////////////////
1889 // shared memory bookkeeping
1890 //
1891 // the os::reserve_memory() API and friends hand out different kind of memory, depending
1892 // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat.
1893 //
1894 // But these memory types have to be treated differently. For example, to uncommit
1895 // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory,
1896 // disclaim64() is needed.
1897 //
1898 // Therefore we need to keep track of the allocated memory segments and their
1899 // properties.
1900
1901 // ShmBkBlock: base class for all blocks in the shared memory bookkeeping
1902 class ShmBkBlock : public CHeapObj<mtInternal> {
1903
1904 ShmBkBlock* _next;
1905
1906 protected:
1907
1908 AddrRange _range;
1909 const size_t _pagesize;
1910 const bool _pinned;
1911
1912 public:
1913
1914 ShmBkBlock(AddrRange range, size_t pagesize, bool pinned)
1915 : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) {
1916
1917 assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size");
1918 assert(!_range.is_empty(), "invalid range");
1919 }
1920
1921 virtual void print(outputStream* st) const {
1922 st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s",
1923 _range.start(), _range.end(), _range.size(),
1924 _range.size() / _pagesize, describe_pagesize(_pagesize),
1925 _pinned ? "pinned" : "");
1926 }
1927
1928 enum Type { MMAP, SHMAT };
1929 virtual Type getType() = 0;
1930
1931 char* base() const { return _range.start(); }
1932 size_t size() const { return _range.size(); }
1933
1934 void setAddrRange(AddrRange range) {
1935 _range = range;
1936 }
1937
1938 bool containsAddress(const char* p) const {
1939 return _range.contains(p);
1940 }
1941
1942 bool containsRange(const char* p, size_t size) const {
1943 return _range.contains(AddrRange((char*)p, size));
1944 }
1945
1946 bool isSameRange(const char* p, size_t size) const {
1947 return _range.is_same_range(AddrRange((char*)p, size));
1948 }
1949
1950 virtual bool disclaim(char* p, size_t size) = 0;
1951 virtual bool release() = 0;
1952
1953 // blocks live in a list.
1954 ShmBkBlock* next() const { return _next; }
1955 void set_next(ShmBkBlock* blk) { _next = blk; }
1956
1957 }; // end: ShmBkBlock
1958
1959
1960 // ShmBkMappedBlock: describes an block allocated with mmap()
1961 class ShmBkMappedBlock : public ShmBkBlock {
1962 public:
1963
1964 ShmBkMappedBlock(AddrRange range)
1965 : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned
1966
1967 void print(outputStream* st) const {
1968 ShmBkBlock::print(st);
1969 st->print_cr(" - mmap'ed");
1970 }
1971
1972 Type getType() {
1973 return MMAP;
1974 }
1975
1976 bool disclaim(char* p, size_t size) {
1977
1978 AddrRange r(p, size);
1979
1980 guarantee(_range.contains(r), "invalid disclaim");
1981
1982 // only disclaim whole ranges.
1983 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
1984 if (r2.is_empty()) {
1985 return true;
1986 }
1987
1988 const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE);
1989
1990 if (rc != 0) {
1991 warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno);
1992 }
1993
1994 return rc == 0 ? true : false;
1995 }
1996
1997 bool release() {
1998 // mmap'ed blocks are released using munmap
1999 if (::munmap(_range.start(), _range.size()) != 0) {
2000 warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno);
2001 return false;
2002 }
2003 return true;
2004 }
2005 }; // end: ShmBkMappedBlock
2006
2007 // ShmBkShmatedBlock: describes an block allocated with shmget/shmat()
2008 class ShmBkShmatedBlock : public ShmBkBlock {
2009 public:
2010
2011 ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned)
2012 : ShmBkBlock(range, pagesize, pinned) {}
2013
2014 void print(outputStream* st) const {
2015 ShmBkBlock::print(st);
2016 st->print_cr(" - shmat'ed");
2017 }
2018
2019 Type getType() {
2020 return SHMAT;
2021 }
2022
2023 bool disclaim(char* p, size_t size) {
2024
2025 AddrRange r(p, size);
2026
2027 if (_pinned) {
2028 return true;
2029 }
2030
2031 // shmat'ed blocks are disclaimed using disclaim64
2032 guarantee(_range.contains(r), "invalid disclaim");
2033
2034 // only disclaim whole ranges.
2035 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
2036 if (r2.is_empty()) {
2037 return true;
2038 }
2039
2040 const bool rc = my_disclaim64(r2.start(), r2.size());
2041
2042 if (Verbose && !rc) {
2043 warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end());
2044 }
2045
2046 return rc;
2047 }
2048
2049 bool release() {
2050 bool rc = false;
2051 if (::shmdt(_range.start()) != 0) {
2052 warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno);
2053 } else {
2054 rc = true;
2055 }
2056 return rc;
2057 }
2058
2059 }; // end: ShmBkShmatedBlock
2060
2061 static ShmBkBlock* g_shmbk_list = NULL;
2062 static volatile jint g_shmbk_table_lock = 0;
2063
2064 // keep some usage statistics
2065 static struct {
2066 int nodes; // number of nodes in list
2067 size_t bytes; // reserved - not committed - bytes.
2068 int reserves; // how often reserve was called
2069 int lookups; // how often a lookup was made
2070 } g_shmbk_stats = { 0, 0, 0, 0 };
2071
2072 // add information about a shared memory segment to the bookkeeping
2073 static void shmbk_register(ShmBkBlock* p_block) {
2074 guarantee(p_block, "logic error");
2075 p_block->set_next(g_shmbk_list);
2076 g_shmbk_list = p_block;
2077 g_shmbk_stats.reserves ++;
2078 g_shmbk_stats.bytes += p_block->size();
2079 g_shmbk_stats.nodes ++;
2080 }
2081
2082 // remove information about a shared memory segment by its starting address
2083 static void shmbk_unregister(ShmBkBlock* p_block) {
2084 ShmBkBlock* p = g_shmbk_list;
2085 ShmBkBlock* prev = NULL;
2086 while (p) {
2087 if (p == p_block) {
2088 if (prev) {
2089 prev->set_next(p->next());
2090 } else {
2091 g_shmbk_list = p->next();
2092 }
2093 g_shmbk_stats.nodes --;
2094 g_shmbk_stats.bytes -= p->size();
2095 return;
2096 }
2097 prev = p;
2098 p = p->next();
2099 }
2100 assert(false, "should not happen");
2101 }
2102
2103 // given a pointer, return shared memory bookkeeping record for the segment it points into
2104 // using the returned block info must happen under lock protection
2105 static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) {
2106 g_shmbk_stats.lookups ++;
2107 ShmBkBlock* p = g_shmbk_list;
2108 while (p) {
2109 if (p->containsAddress(addr)) {
2110 return p;
2111 }
2112 p = p->next();
2113 }
2114 return NULL;
2115 }
2116
2117 // dump all information about all memory segments allocated with os::reserve_memory()
2118 void shmbk_dump_info() {
2119 tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, "
2120 "total reserves: %d total lookups: %d)",
2121 g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups);
2122 const ShmBkBlock* p = g_shmbk_list;
2123 int i = 0;
2124 while (p) {
2125 p->print(tty);
2126 p = p->next();
2127 i ++;
2128 }
2129 }
2130
2131 #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK;
2132 #define UNLOCK_SHMBK }
2133
2134 // End: shared memory bookkeeping
2135 ////////////////////////////////////////////////////////////////////////////////////////////////////
2136
2137 int os::vm_page_size() {
2138 // Seems redundant as all get out
2139 assert(os::Aix::page_size() != -1, "must call os::init");
2140 return os::Aix::page_size();
2141 }
2142
2143 // Aix allocates memory by pages.
2144 int os::vm_allocation_granularity() {
2145 assert(os::Aix::page_size() != -1, "must call os::init");
2146 return os::Aix::page_size();
2147 }
2148
2149 int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) {
2150
2151 // Commit is a noop. There is no explicit commit
2152 // needed on AIX. Memory is committed when touched.
2153 //
2154 // Debug : check address range for validity
2155 #ifdef ASSERT
2156 LOCK_SHMBK
2157 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2158 if (!block) {
2159 fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr);
2160 shmbk_dump_info();
2161 assert(false, "invalid pointer");
2162 return false;
2163 } else if (!block->containsRange(addr, size)) {
2164 fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size);
2165 shmbk_dump_info();
2166 assert(false, "invalid range");
2167 return false;
2168 }
2169 UNLOCK_SHMBK
2170 #endif // ASSERT
2171
2172 return 0;
2173 }
2174
2175 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2176 return os::Aix::commit_memory_impl(addr, size, exec) == 0;
2177 }
2178
2179 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2180 const char* mesg) {
2181 assert(mesg != NULL, "mesg must be specified");
2182 os::Aix::commit_memory_impl(addr, size, exec);
2183 }
2184
2185 int os::Aix::commit_memory_impl(char* addr, size_t size,
2186 size_t alignment_hint, bool exec) {
2187 return os::Aix::commit_memory_impl(addr, size, exec);
2188 }
2189
2190 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2191 bool exec) {
2192 return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0;
2193 }
2194
2195 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2196 size_t alignment_hint, bool exec,
2197 const char* mesg) {
2198 os::Aix::commit_memory_impl(addr, size, alignment_hint, exec);
2199 }
2200
2201 bool os::pd_uncommit_memory(char* addr, size_t size) {
2202
2203 // Delegate to ShmBkBlock class which knows how to uncommit its memory.
2204
2205 bool rc = false;
2206 LOCK_SHMBK
2207 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2208 if (!block) {
2209 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2210 shmbk_dump_info();
2211 assert(false, "invalid pointer");
2212 return false;
2213 } else if (!block->containsRange(addr, size)) {
2214 fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size);
2215 shmbk_dump_info();
2216 assert(false, "invalid range");
2217 return false;
2218 }
2219 rc = block->disclaim(addr, size);
2220 UNLOCK_SHMBK
2221
2222 if (Verbose && !rc) {
2223 warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size);
2224 }
2225 return rc;
2226 }
2227
2228 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2229 return os::guard_memory(addr, size);
2230 }
2231
2232 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2233 return os::unguard_memory(addr, size);
2234 }
2235
2236 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2237 }
2238
2239 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2240 }
2241
2242 void os::numa_make_global(char *addr, size_t bytes) {
2243 }
2244
2245 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2246 }
2247
2248 bool os::numa_topology_changed() {
2249 return false;
2250 }
2251
2252 size_t os::numa_get_groups_num() {
2253 return 1;
2254 }
2255
2256 int os::numa_get_group_id() {
2257 return 0;
2258 }
2259
2260 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2261 if (size > 0) {
2262 ids[0] = 0;
2263 return 1;
2264 }
2265 return 0;
2266 }
2267
2268 bool os::get_page_info(char *start, page_info* info) {
2269 return false;
2270 }
2271
2272 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2273 return end;
2274 }
2275
2276 // Flags for reserve_shmatted_memory:
2277 #define RESSHM_WISHADDR_OR_FAIL 1
2278 #define RESSHM_TRY_16M_PAGES 2
2279 #define RESSHM_16M_PAGES_OR_FAIL 4
2280
2281 // Result of reserve_shmatted_memory:
2282 struct shmatted_memory_info_t {
2283 char* addr;
2284 size_t pagesize;
2285 bool pinned;
2286 };
2287
2288 // Reserve a section of shmatted memory.
2289 // params:
2290 // bytes [in]: size of memory, in bytes
2291 // requested_addr [in]: wish address.
2292 // NULL = no wish.
2293 // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot
2294 // be obtained, function will fail. Otherwise wish address is treated as hint and
2295 // another pointer is returned.
2296 // flags [in]: some flags. Valid flags are:
2297 // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained.
2298 // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool
2299 // (requires UseLargePages and Use16MPages)
2300 // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail.
2301 // Otherwise any other page size will do.
2302 // p_info [out] : holds information about the created shared memory segment.
2303 static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) {
2304
2305 assert(p_info, "parameter error");
2306
2307 // init output struct.
2308 p_info->addr = NULL;
2309
2310 // neither should we be here for EXTSHM=ON.
2311 if (os::Aix::extshm()) {
2312 ShouldNotReachHere();
2313 }
2314
2315 // extract flags. sanity checks.
2316 const bool wishaddr_or_fail =
2317 flags & RESSHM_WISHADDR_OR_FAIL;
2318 const bool try_16M_pages =
2319 flags & RESSHM_TRY_16M_PAGES;
2320 const bool f16M_pages_or_fail =
2321 flags & RESSHM_16M_PAGES_OR_FAIL;
2322
2323 // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary,
2324 // shmat will fail anyway, so save some cycles by failing right away
2325 if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) {
2326 if (wishaddr_or_fail) {
2327 return false;
2328 } else {
2329 requested_addr = NULL;
2330 }
2331 }
2332
2333 char* addr = NULL;
2334
2335 // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change
2336 // pagesize dynamically.
2337 const size_t size = align_size_up(bytes, SIZE_16M);
2338
2339 // reserve the shared segment
2340 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2341 if (shmid == -1) {
2342 warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno);
2343 return false;
2344 }
2345
2346 // Important note:
2347 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2348 // We must right after attaching it remove it from the system. System V shm segments are global and
2349 // survive the process.
2350 // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm".
2351
2352 // try forcing the page size
2353 size_t pagesize = -1; // unknown so far
2354
2355 if (UseLargePages) {
2356
2357 struct shmid_ds shmbuf;
2358 memset(&shmbuf, 0, sizeof(shmbuf));
2359
2360 // First, try to take from 16M page pool if...
2361 if (os::Aix::can_use_16M_pages() // we can ...
2362 && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages)..
2363 && try_16M_pages) { // caller wants us to.
2364 shmbuf.shm_pagesize = SIZE_16M;
2365 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2366 pagesize = SIZE_16M;
2367 } else {
2368 warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)",
2369 size / SIZE_16M, errno);
2370 if (f16M_pages_or_fail) {
2371 goto cleanup_shm;
2372 }
2373 }
2374 }
2375
2376 // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might,
2377 // because the 64K page pool may also be exhausted.
2378 if (pagesize == -1) {
2379 shmbuf.shm_pagesize = SIZE_64K;
2380 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2381 pagesize = SIZE_64K;
2382 } else {
2383 warning("Failed to allocate %d 64K pages. (shmctl failed with %d)",
2384 size / SIZE_64K, errno);
2385 // here I give up. leave page_size -1 - later, after attaching, we will query the
2386 // real page size of the attached memory. (in theory, it may be something different
2387 // from 4K if LDR_CNTRL SHM_PSIZE is set)
2388 }
2389 }
2390 }
2391
2392 // sanity point
2393 assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size");
2394
2395 // Now attach the shared segment.
2396 addr = (char*) shmat(shmid, requested_addr, 0);
2397 if (addr == (char*)-1) {
2398 // How to handle attach failure:
2399 // If it failed for a specific wish address, tolerate this: in that case, if wish address was
2400 // mandatory, fail, if not, retry anywhere.
2401 // If it failed for any other reason, treat that as fatal error.
2402 addr = NULL;
2403 if (requested_addr) {
2404 if (wishaddr_or_fail) {
2405 goto cleanup_shm;
2406 } else {
2407 addr = (char*) shmat(shmid, NULL, 0);
2408 if (addr == (char*)-1) { // fatal
2409 addr = NULL;
2410 warning("shmat failed (errno: %d)", errno);
2411 goto cleanup_shm;
2412 }
2413 }
2414 } else { // fatal
2415 addr = NULL;
2416 warning("shmat failed (errno: %d)", errno);
2417 goto cleanup_shm;
2418 }
2419 }
2420
2421 // sanity point
2422 assert(addr && addr != (char*) -1, "wrong address");
2423
2424 // after successful Attach remove the segment - right away.
2425 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2426 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2427 guarantee(false, "failed to remove shared memory segment!");
2428 }
2429 shmid = -1;
2430
2431 // query the real page size. In case setting the page size did not work (see above), the system
2432 // may have given us something other then 4K (LDR_CNTRL)
2433 {
2434 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2435 if (pagesize != -1) {
2436 assert(pagesize == real_pagesize, "unexpected pagesize after shmat");
2437 } else {
2438 pagesize = real_pagesize;
2439 }
2440 }
2441
2442 // Now register the reserved block with internal book keeping.
2443 LOCK_SHMBK
2444 const bool pinned = pagesize >= SIZE_16M ? true : false;
2445 ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned);
2446 assert(p_block, "");
2447 shmbk_register(p_block);
2448 UNLOCK_SHMBK
2449
2450 cleanup_shm:
2451
2452 // if we have not done so yet, remove the shared memory segment. This is very important.
2453 if (shmid != -1) {
2454 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2455 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2456 guarantee(false, "failed to remove shared memory segment!");
2457 }
2458 shmid = -1;
2459 }
2460
2461 // trace
2462 if (Verbose && !addr) {
2463 if (requested_addr != NULL) {
2464 warning("failed to shm-allocate 0x%llX bytes at wish address 0x%p.", size, requested_addr);
2465 } else {
2466 warning("failed to shm-allocate 0x%llX bytes at any address.", size);
2467 }
2468 }
2469
2470 // hand info to caller
2471 if (addr) {
2472 p_info->addr = addr;
2473 p_info->pagesize = pagesize;
2474 p_info->pinned = pagesize == SIZE_16M ? true : false;
2475 }
2476
2477 // sanity test:
2478 if (requested_addr && addr && wishaddr_or_fail) {
2479 guarantee(addr == requested_addr, "shmat error");
2480 }
2481
2482 // just one more test to really make sure we have no dangling shm segments.
2483 guarantee(shmid == -1, "dangling shm segments");
2484
2485 return addr ? true : false;
2486
2487 } // end: reserve_shmatted_memory
2488
2489 // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory():
2490 // will return NULL in case of an error.
2491 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) {
2492
2493 // if a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2494 if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) {
2495 warning("Wish address 0x%p not aligned to page boundary.", requested_addr);
2496 return NULL;
2497 }
2498
2499 const size_t size = align_size_up(bytes, SIZE_4K);
2500
2501 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2502 // msync(MS_INVALIDATE) (see os::uncommit_memory)
2503 int flags = MAP_ANONYMOUS | MAP_SHARED;
2504
2505 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2506 // it means if wishaddress is given but MAP_FIXED is not set.
2507 //
2508 // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED
2509 // clobbers the address range, which is probably not what the caller wants. That's
2510 // why I assert here (again) that the SPEC1170 compat mode is off.
2511 // If we want to be able to run under SPEC1170, we have to do some porting and
2512 // testing.
2513 if (requested_addr != NULL) {
2514 assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed.");
2515 flags |= MAP_FIXED;
2516 }
2517
2518 char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2519
2520 if (addr == MAP_FAILED) {
2521 // attach failed: tolerate for specific wish addresses. Not being able to attach
2522 // anywhere is a fatal error.
2523 if (requested_addr == NULL) {
2524 // It's ok to fail here if the machine has not enough memory.
2525 warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno);
2526 }
2527 addr = NULL;
2528 goto cleanup_mmap;
2529 }
2530
2531 // If we did request a specific address and that address was not available, fail.
2532 if (addr && requested_addr) {
2533 guarantee(addr == requested_addr, "unexpected");
2534 }
2535
2536 // register this mmap'ed segment with book keeping
2537 LOCK_SHMBK
2538 ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size));
2539 assert(p_block, "");
2540 shmbk_register(p_block);
2541 UNLOCK_SHMBK
2542
2543 cleanup_mmap:
2544
2545 // trace
2546 if (Verbose) {
2547 if (addr) {
2548 fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes);
2549 }
2550 else {
2551 if (requested_addr != NULL) {
2552 warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr);
2553 } else {
2554 warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes);
2555 }
2556 }
2557 }
2558
2559 return addr;
2560
2561 } // end: reserve_mmaped_memory
2562
2563 // Reserves and attaches a shared memory segment.
2564 // Will assert if a wish address is given and could not be obtained.
2565 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2566 return os::attempt_reserve_memory_at(bytes, requested_addr);
2567 }
2568
2569 bool os::pd_release_memory(char* addr, size_t size) {
2570
2571 // delegate to ShmBkBlock class which knows how to uncommit its memory.
2572
2573 bool rc = false;
2574 LOCK_SHMBK
2575 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2576 if (!block) {
2577 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2578 shmbk_dump_info();
2579 assert(false, "invalid pointer");
2580 return false;
2581 }
2582 else if (!block->isSameRange(addr, size)) {
2583 if (block->getType() == ShmBkBlock::MMAP) {
2584 // Release only the same range or a the beginning or the end of a range.
2585 if (block->base() == addr && size < block->size()) {
2586 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size));
2587 assert(b, "");
2588 shmbk_register(b);
2589 block->setAddrRange(AddrRange(addr, size));
2590 }
2591 else if (addr > block->base() && addr + size == block->base() + block->size()) {
2592 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size));
2593 assert(b, "");
2594 shmbk_register(b);
2595 block->setAddrRange(AddrRange(addr, size));
2596 }
2597 else {
2598 fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size);
2599 shmbk_dump_info();
2600 assert(false, "invalid mmap range");
2601 return false;
2602 }
2603 }
2604 else {
2605 // Release only the same range. No partial release allowed.
2606 // Soften the requirement a bit, because the user may think he owns a smaller size
2607 // than the block is due to alignment etc.
2608 if (block->base() != addr || block->size() < size) {
2609 fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size);
2610 shmbk_dump_info();
2611 assert(false, "invalid shmget range");
2612 return false;
2613 }
2614 }
2615 }
2616 rc = block->release();
2617 assert(rc, "release failed");
2618 // remove block from bookkeeping
2619 shmbk_unregister(block);
2620 delete block;
2621 UNLOCK_SHMBK
2622
2623 if (!rc) {
2624 warning("failed to released %lu bytes at 0x%p", size, addr);
2625 }
2626
2627 return rc;
2628 }
2629
2630 static bool checked_mprotect(char* addr, size_t size, int prot) {
2631
2632 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2633 // not tell me if protection failed when trying to protect an un-protectable range.
2634 //
2635 // This means if the memory was allocated using shmget/shmat, protection wont work
2636 // but mprotect will still return 0:
2637 //
2638 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2639
2640 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2641
2642 if (!rc) {
2643 const char* const s_errno = strerror(errno);
2644 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2645 return false;
2646 }
2647
2648 // mprotect success check
2649 //
2650 // Mprotect said it changed the protection but can I believe it?
2651 //
2652 // To be sure I need to check the protection afterwards. Try to
2653 // read from protected memory and check whether that causes a segfault.
2654 //
2655 if (!os::Aix::xpg_sus_mode()) {
2656
2657 if (StubRoutines::SafeFetch32_stub()) {
2658
2659 const bool read_protected =
2660 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2661 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2662
2663 if (prot & PROT_READ) {
2664 rc = !read_protected;
2665 } else {
2666 rc = read_protected;
2667 }
2668 }
2669 }
2670 if (!rc) {
2671 assert(false, "mprotect failed.");
2672 }
2673 return rc;
2674 }
2675
2676 // Set protections specified
2677 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2678 unsigned int p = 0;
2679 switch (prot) {
2680 case MEM_PROT_NONE: p = PROT_NONE; break;
2681 case MEM_PROT_READ: p = PROT_READ; break;
2682 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2683 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2684 default:
2685 ShouldNotReachHere();
2686 }
2687 // is_committed is unused.
2688 return checked_mprotect(addr, size, p);
2689 }
2690
2691 bool os::guard_memory(char* addr, size_t size) {
2692 return checked_mprotect(addr, size, PROT_NONE);
2693 }
2694
2695 bool os::unguard_memory(char* addr, size_t size) {
2696 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2697 }
2698
2699 // Large page support
2700
2701 static size_t _large_page_size = 0;
2702
2703 // Enable large page support if OS allows that.
2704 void os::large_page_init() {
2705
2706 // Note: os::Aix::query_multipage_support must run first.
2707
2708 if (!UseLargePages) {
2709 return;
2710 }
2711
2712 if (!Aix::can_use_64K_pages()) {
2713 assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M.");
2714 UseLargePages = false;
2715 return;
2716 }
2717
2718 if (!Aix::can_use_16M_pages() && Use16MPages) {
2719 fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool "
2720 " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n");
2721 }
2722
2723 // Do not report 16M page alignment as part of os::_page_sizes if we are
2724 // explicitly forbidden from using 16M pages. Doing so would increase the
2725 // alignment the garbage collector calculates with, slightly increasing
2726 // heap usage. We should only pay for 16M alignment if we really want to
2727 // use 16M pages.
2728 if (Use16MPages && Aix::can_use_16M_pages()) {
2729 _large_page_size = SIZE_16M;
2730 _page_sizes[0] = SIZE_16M;
2731 _page_sizes[1] = SIZE_64K;
2732 _page_sizes[2] = SIZE_4K;
2733 _page_sizes[3] = 0;
2734 } else if (Aix::can_use_64K_pages()) {
2735 _large_page_size = SIZE_64K;
2736 _page_sizes[0] = SIZE_64K;
2737 _page_sizes[1] = SIZE_4K;
2738 _page_sizes[2] = 0;
2739 }
2740
2741 if (Verbose) {
2742 ("Default large page size is 0x%llX.", _large_page_size);
2743 }
2744 } // end: os::large_page_init()
2745
2746 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2747 // "exec" is passed in but not used. Creating the shared image for
2748 // the code cache doesn't have an SHM_X executable permission to check.
2749 Unimplemented();
2750 return 0;
2751 }
2752
2753 bool os::release_memory_special(char* base, size_t bytes) {
2754 // detaching the SHM segment will also delete it, see reserve_memory_special()
2755 Unimplemented();
2756 return false;
2757 }
2758
2759 size_t os::large_page_size() {
2760 return _large_page_size;
2761 }
2762
2763 bool os::can_commit_large_page_memory() {
2764 // Well, sadly we cannot commit anything at all (see comment in
2765 // os::commit_memory) but we claim to so we can make use of large pages
2766 return true;
2767 }
2768
2769 bool os::can_execute_large_page_memory() {
2770 // We can do that
2771 return true;
2772 }
2773
2774 // Reserve memory at an arbitrary address, only if that area is
2775 // available (and not reserved for something else).
2776 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2777
2778 bool use_mmap = false;
2779
2780 // mmap: smaller graining, no large page support
2781 // shm: large graining (256M), large page support, limited number of shm segments
2782 //
2783 // Prefer mmap wherever we either do not need large page support or have OS limits
2784
2785 if (!UseLargePages || bytes < SIZE_16M) {
2786 use_mmap = true;
2787 }
2788
2789 char* addr = NULL;
2790 if (use_mmap) {
2791 addr = reserve_mmaped_memory(bytes, requested_addr);
2792 } else {
2793 // shmat: wish address is mandatory, and do not try 16M pages here.
2794 shmatted_memory_info_t info;
2795 const int flags = RESSHM_WISHADDR_OR_FAIL;
2796 if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) {
2797 addr = info.addr;
2798 }
2799 }
2800
2801 return addr;
2802 }
2803
2804 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2805 return ::read(fd, buf, nBytes);
2806 }
2807
2808 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2809 return ::pread(fd, buf, nBytes, offset);
2810 }
2811
2812 void os::naked_short_sleep(jlong ms) {
2813 struct timespec req;
2814
2815 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2816 req.tv_sec = 0;
2817 if (ms > 0) {
2818 req.tv_nsec = (ms % 1000) * 1000000;
2819 }
2820 else {
2821 req.tv_nsec = 1;
2822 }
2823
2824 nanosleep(&req, NULL);
2825
2826 return;
2827 }
2828
2829 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2830 void os::infinite_sleep() {
2831 while (true) { // sleep forever ...
2832 ::sleep(100); // ... 100 seconds at a time
2833 }
2834 }
2835
2836 // Used to convert frequent JVM_Yield() to nops
2837 bool os::dont_yield() {
2838 return DontYieldALot;
2839 }
2840
2841 void os::naked_yield() {
2842 sched_yield();
2843 }
2844
2845 ////////////////////////////////////////////////////////////////////////////////
2846 // thread priority support
2847
2848 // From AIX manpage to pthread_setschedparam
2849 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2850 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2851 //
2852 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2853 // range from 40 to 80, where 40 is the least favored priority and 80
2854 // is the most favored."
2855 //
2856 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2857 // scheduling there; however, this still leaves iSeries.)
2858 //
2859 // We use the same values for AIX and PASE.
2860 int os::java_to_os_priority[CriticalPriority + 1] = {
2861 54, // 0 Entry should never be used
2862
2863 55, // 1 MinPriority
2864 55, // 2
2865 56, // 3
2866
2867 56, // 4
2868 57, // 5 NormPriority
2869 57, // 6
2870
2871 58, // 7
2872 58, // 8
2873 59, // 9 NearMaxPriority
2874
2875 60, // 10 MaxPriority
2876
2877 60 // 11 CriticalPriority
2878 };
2879
2880 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2881 if (!UseThreadPriorities) return OS_OK;
2882 pthread_t thr = thread->osthread()->pthread_id();
2883 int policy = SCHED_OTHER;
2884 struct sched_param param;
2885 param.sched_priority = newpri;
2886 int ret = pthread_setschedparam(thr, policy, ¶m);
2887
2888 if (ret != 0) {
2889 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2890 (int)thr, newpri, ret, strerror(ret));
2891 }
2892 return (ret == 0) ? OS_OK : OS_ERR;
2893 }
2894
2895 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2896 if (!UseThreadPriorities) {
2897 *priority_ptr = java_to_os_priority[NormPriority];
2898 return OS_OK;
2899 }
2900 pthread_t thr = thread->osthread()->pthread_id();
2901 int policy = SCHED_OTHER;
2902 struct sched_param param;
2903 int ret = pthread_getschedparam(thr, &policy, ¶m);
2904 *priority_ptr = param.sched_priority;
2905
2906 return (ret == 0) ? OS_OK : OS_ERR;
2907 }
2908
2909 // Hint to the underlying OS that a task switch would not be good.
2910 // Void return because it's a hint and can fail.
2911 void os::hint_no_preempt() {}
2912
2913 ////////////////////////////////////////////////////////////////////////////////
2914 // suspend/resume support
2915
2916 // the low-level signal-based suspend/resume support is a remnant from the
2917 // old VM-suspension that used to be for java-suspension, safepoints etc,
2918 // within hotspot. Now there is a single use-case for this:
2919 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2920 // that runs in the watcher thread.
2921 // The remaining code is greatly simplified from the more general suspension
2922 // code that used to be used.
2923 //
2924 // The protocol is quite simple:
2925 // - suspend:
2926 // - sends a signal to the target thread
2927 // - polls the suspend state of the osthread using a yield loop
2928 // - target thread signal handler (SR_handler) sets suspend state
2929 // and blocks in sigsuspend until continued
2930 // - resume:
2931 // - sets target osthread state to continue
2932 // - sends signal to end the sigsuspend loop in the SR_handler
2933 //
2934 // Note that the SR_lock plays no role in this suspend/resume protocol.
2935 //
2936
2937 static void resume_clear_context(OSThread *osthread) {
2938 osthread->set_ucontext(NULL);
2939 osthread->set_siginfo(NULL);
2940 }
2941
2942 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2943 osthread->set_ucontext(context);
2944 osthread->set_siginfo(siginfo);
2945 }
2946
2947 //
2948 // Handler function invoked when a thread's execution is suspended or
2949 // resumed. We have to be careful that only async-safe functions are
2950 // called here (Note: most pthread functions are not async safe and
2951 // should be avoided.)
2952 //
2953 // Note: sigwait() is a more natural fit than sigsuspend() from an
2954 // interface point of view, but sigwait() prevents the signal hander
2955 // from being run. libpthread would get very confused by not having
2956 // its signal handlers run and prevents sigwait()'s use with the
2957 // mutex granting granting signal.
2958 //
2959 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2960 //
2961 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2962 // Save and restore errno to avoid confusing native code with EINTR
2963 // after sigsuspend.
2964 int old_errno = errno;
2965
2966 Thread* thread = Thread::current();
2967 OSThread* osthread = thread->osthread();
2968 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2969
2970 os::SuspendResume::State current = osthread->sr.state();
2971 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2972 suspend_save_context(osthread, siginfo, context);
2973
2974 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2975 os::SuspendResume::State state = osthread->sr.suspended();
2976 if (state == os::SuspendResume::SR_SUSPENDED) {
2977 sigset_t suspend_set; // signals for sigsuspend()
2978
2979 // get current set of blocked signals and unblock resume signal
2980 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2981 sigdelset(&suspend_set, SR_signum);
2982
2983 // wait here until we are resumed
2984 while (1) {
2985 sigsuspend(&suspend_set);
2986
2987 os::SuspendResume::State result = osthread->sr.running();
2988 if (result == os::SuspendResume::SR_RUNNING) {
2989 break;
2990 }
2991 }
2992
2993 } else if (state == os::SuspendResume::SR_RUNNING) {
2994 // request was cancelled, continue
2995 } else {
2996 ShouldNotReachHere();
2997 }
2998
2999 resume_clear_context(osthread);
3000 } else if (current == os::SuspendResume::SR_RUNNING) {
3001 // request was cancelled, continue
3002 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3003 // ignore
3004 } else {
3005 ShouldNotReachHere();
3006 }
3007
3008 errno = old_errno;
3009 }
3010
3011 static int SR_initialize() {
3012 struct sigaction act;
3013 char *s;
3014 // Get signal number to use for suspend/resume
3015 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
3016 int sig = ::strtol(s, 0, 10);
3017 if (sig > 0 || sig < NSIG) {
3018 SR_signum = sig;
3019 }
3020 }
3021
3022 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
3023 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
3024
3025 sigemptyset(&SR_sigset);
3026 sigaddset(&SR_sigset, SR_signum);
3027
3028 // Set up signal handler for suspend/resume.
3029 act.sa_flags = SA_RESTART|SA_SIGINFO;
3030 act.sa_handler = (void (*)(int)) SR_handler;
3031
3032 // SR_signum is blocked by default.
3033 // 4528190 - We also need to block pthread restart signal (32 on all
3034 // supported Linux platforms). Note that LinuxThreads need to block
3035 // this signal for all threads to work properly. So we don't have
3036 // to use hard-coded signal number when setting up the mask.
3037 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
3038
3039 if (sigaction(SR_signum, &act, 0) == -1) {
3040 return -1;
3041 }
3042
3043 // Save signal flag
3044 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
3045 return 0;
3046 }
3047
3048 static int SR_finalize() {
3049 return 0;
3050 }
3051
3052 static int sr_notify(OSThread* osthread) {
3053 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3054 assert_status(status == 0, status, "pthread_kill");
3055 return status;
3056 }
3057
3058 // "Randomly" selected value for how long we want to spin
3059 // before bailing out on suspending a thread, also how often
3060 // we send a signal to a thread we want to resume
3061 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3062 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3063
3064 // returns true on success and false on error - really an error is fatal
3065 // but this seems the normal response to library errors
3066 static bool do_suspend(OSThread* osthread) {
3067 assert(osthread->sr.is_running(), "thread should be running");
3068 // mark as suspended and send signal
3069
3070 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3071 // failed to switch, state wasn't running?
3072 ShouldNotReachHere();
3073 return false;
3074 }
3075
3076 if (sr_notify(osthread) != 0) {
3077 // try to cancel, switch to running
3078
3079 os::SuspendResume::State result = osthread->sr.cancel_suspend();
3080 if (result == os::SuspendResume::SR_RUNNING) {
3081 // cancelled
3082 return false;
3083 } else if (result == os::SuspendResume::SR_SUSPENDED) {
3084 // somehow managed to suspend
3085 return true;
3086 } else {
3087 ShouldNotReachHere();
3088 return false;
3089 }
3090 }
3091
3092 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3093
3094 for (int n = 0; !osthread->sr.is_suspended(); n++) {
3095 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
3096 os::naked_yield();
3097 }
3098
3099 // timeout, try to cancel the request
3100 if (n >= RANDOMLY_LARGE_INTEGER) {
3101 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3102 if (cancelled == os::SuspendResume::SR_RUNNING) {
3103 return false;
3104 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3105 return true;
3106 } else {
3107 ShouldNotReachHere();
3108 return false;
3109 }
3110 }
3111 }
3112
3113 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3114 return true;
3115 }
3116
3117 static void do_resume(OSThread* osthread) {
3118 //assert(osthread->sr.is_suspended(), "thread should be suspended");
3119
3120 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3121 // failed to switch to WAKEUP_REQUEST
3122 ShouldNotReachHere();
3123 return;
3124 }
3125
3126 while (!osthread->sr.is_running()) {
3127 if (sr_notify(osthread) == 0) {
3128 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
3129 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
3130 os::naked_yield();
3131 }
3132 }
3133 } else {
3134 ShouldNotReachHere();
3135 }
3136 }
3137
3138 guarantee(osthread->sr.is_running(), "Must be running!");
3139 }
3140
3141 ///////////////////////////////////////////////////////////////////////////////////
3142 // signal handling (except suspend/resume)
3143
3144 // This routine may be used by user applications as a "hook" to catch signals.
3145 // The user-defined signal handler must pass unrecognized signals to this
3146 // routine, and if it returns true (non-zero), then the signal handler must
3147 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3148 // routine will never retun false (zero), but instead will execute a VM panic
3149 // routine kill the process.
3150 //
3151 // If this routine returns false, it is OK to call it again. This allows
3152 // the user-defined signal handler to perform checks either before or after
3153 // the VM performs its own checks. Naturally, the user code would be making
3154 // a serious error if it tried to handle an exception (such as a null check
3155 // or breakpoint) that the VM was generating for its own correct operation.
3156 //
3157 // This routine may recognize any of the following kinds of signals:
3158 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3159 // It should be consulted by handlers for any of those signals.
3160 //
3161 // The caller of this routine must pass in the three arguments supplied
3162 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3163 // field of the structure passed to sigaction(). This routine assumes that
3164 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3165 //
3166 // Note that the VM will print warnings if it detects conflicting signal
3167 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3168 //
3169 extern "C" JNIEXPORT int
3170 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
3171
3172 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3173 // to be the thing to call; documentation is not terribly clear about whether
3174 // pthread_sigmask also works, and if it does, whether it does the same.
3175 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3176 const int rc = ::pthread_sigmask(how, set, oset);
3177 // return value semantics differ slightly for error case:
3178 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3179 // (so, pthread_sigmask is more theadsafe for error handling)
3180 // But success is always 0.
3181 return rc == 0 ? true : false;
3182 }
3183
3184 // Function to unblock all signals which are, according
3185 // to POSIX, typical program error signals. If they happen while being blocked,
3186 // they typically will bring down the process immediately.
3187 bool unblock_program_error_signals() {
3188 sigset_t set;
3189 ::sigemptyset(&set);
3190 ::sigaddset(&set, SIGILL);
3191 ::sigaddset(&set, SIGBUS);
3192 ::sigaddset(&set, SIGFPE);
3193 ::sigaddset(&set, SIGSEGV);
3194 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3195 }
3196
3197 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3198 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3199 assert(info != NULL && uc != NULL, "it must be old kernel");
3200
3201 // Never leave program error signals blocked;
3202 // on all our platforms they would bring down the process immediately when
3203 // getting raised while being blocked.
3204 unblock_program_error_signals();
3205
3206 JVM_handle_aix_signal(sig, info, uc, true);
3207 }
3208
3209 // This boolean allows users to forward their own non-matching signals
3210 // to JVM_handle_aix_signal, harmlessly.
3211 bool os::Aix::signal_handlers_are_installed = false;
3212
3213 // For signal-chaining
3214 struct sigaction os::Aix::sigact[MAXSIGNUM];
3215 unsigned int os::Aix::sigs = 0;
3216 bool os::Aix::libjsig_is_loaded = false;
3217 typedef struct sigaction *(*get_signal_t)(int);
3218 get_signal_t os::Aix::get_signal_action = NULL;
3219
3220 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3221 struct sigaction *actp = NULL;
3222
3223 if (libjsig_is_loaded) {
3224 // Retrieve the old signal handler from libjsig
3225 actp = (*get_signal_action)(sig);
3226 }
3227 if (actp == NULL) {
3228 // Retrieve the preinstalled signal handler from jvm
3229 actp = get_preinstalled_handler(sig);
3230 }
3231
3232 return actp;
3233 }
3234
3235 static bool call_chained_handler(struct sigaction *actp, int sig,
3236 siginfo_t *siginfo, void *context) {
3237 // Call the old signal handler
3238 if (actp->sa_handler == SIG_DFL) {
3239 // It's more reasonable to let jvm treat it as an unexpected exception
3240 // instead of taking the default action.
3241 return false;
3242 } else if (actp->sa_handler != SIG_IGN) {
3243 if ((actp->sa_flags & SA_NODEFER) == 0) {
3244 // automaticlly block the signal
3245 sigaddset(&(actp->sa_mask), sig);
3246 }
3247
3248 sa_handler_t hand = NULL;
3249 sa_sigaction_t sa = NULL;
3250 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3251 // retrieve the chained handler
3252 if (siginfo_flag_set) {
3253 sa = actp->sa_sigaction;
3254 } else {
3255 hand = actp->sa_handler;
3256 }
3257
3258 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3259 actp->sa_handler = SIG_DFL;
3260 }
3261
3262 // try to honor the signal mask
3263 sigset_t oset;
3264 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3265
3266 // call into the chained handler
3267 if (siginfo_flag_set) {
3268 (*sa)(sig, siginfo, context);
3269 } else {
3270 (*hand)(sig);
3271 }
3272
3273 // restore the signal mask
3274 pthread_sigmask(SIG_SETMASK, &oset, 0);
3275 }
3276 // Tell jvm's signal handler the signal is taken care of.
3277 return true;
3278 }
3279
3280 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3281 bool chained = false;
3282 // signal-chaining
3283 if (UseSignalChaining) {
3284 struct sigaction *actp = get_chained_signal_action(sig);
3285 if (actp != NULL) {
3286 chained = call_chained_handler(actp, sig, siginfo, context);
3287 }
3288 }
3289 return chained;
3290 }
3291
3292 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3293 if ((((unsigned int)1 << sig) & sigs) != 0) {
3294 return &sigact[sig];
3295 }
3296 return NULL;
3297 }
3298
3299 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3300 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3301 sigact[sig] = oldAct;
3302 sigs |= (unsigned int)1 << sig;
3303 }
3304
3305 // for diagnostic
3306 int os::Aix::sigflags[MAXSIGNUM];
3307
3308 int os::Aix::get_our_sigflags(int sig) {
3309 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3310 return sigflags[sig];
3311 }
3312
3313 void os::Aix::set_our_sigflags(int sig, int flags) {
3314 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3315 sigflags[sig] = flags;
3316 }
3317
3318 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3319 // Check for overwrite.
3320 struct sigaction oldAct;
3321 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3322
3323 void* oldhand = oldAct.sa_sigaction
3324 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3325 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3326 // Renamed 'signalHandler' to avoid collision with other shared libs.
3327 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3328 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3329 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3330 if (AllowUserSignalHandlers || !set_installed) {
3331 // Do not overwrite; user takes responsibility to forward to us.
3332 return;
3333 } else if (UseSignalChaining) {
3334 // save the old handler in jvm
3335 save_preinstalled_handler(sig, oldAct);
3336 // libjsig also interposes the sigaction() call below and saves the
3337 // old sigaction on it own.
3338 } else {
3339 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3340 "%#lx for signal %d.", (long)oldhand, sig));
3341 }
3342 }
3343
3344 struct sigaction sigAct;
3345 sigfillset(&(sigAct.sa_mask));
3346 if (!set_installed) {
3347 sigAct.sa_handler = SIG_DFL;
3348 sigAct.sa_flags = SA_RESTART;
3349 } else {
3350 // Renamed 'signalHandler' to avoid collision with other shared libs.
3351 sigAct.sa_sigaction = javaSignalHandler;
3352 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3353 }
3354 // Save flags, which are set by ours
3355 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3356 sigflags[sig] = sigAct.sa_flags;
3357
3358 int ret = sigaction(sig, &sigAct, &oldAct);
3359 assert(ret == 0, "check");
3360
3361 void* oldhand2 = oldAct.sa_sigaction
3362 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3363 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3364 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3365 }
3366
3367 // install signal handlers for signals that HotSpot needs to
3368 // handle in order to support Java-level exception handling.
3369 void os::Aix::install_signal_handlers() {
3370 if (!signal_handlers_are_installed) {
3371 signal_handlers_are_installed = true;
3372
3373 // signal-chaining
3374 typedef void (*signal_setting_t)();
3375 signal_setting_t begin_signal_setting = NULL;
3376 signal_setting_t end_signal_setting = NULL;
3377 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3378 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3379 if (begin_signal_setting != NULL) {
3380 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3381 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3382 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3383 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3384 libjsig_is_loaded = true;
3385 assert(UseSignalChaining, "should enable signal-chaining");
3386 }
3387 if (libjsig_is_loaded) {
3388 // Tell libjsig jvm is setting signal handlers
3389 (*begin_signal_setting)();
3390 }
3391
3392 set_signal_handler(SIGSEGV, true);
3393 set_signal_handler(SIGPIPE, true);
3394 set_signal_handler(SIGBUS, true);
3395 set_signal_handler(SIGILL, true);
3396 set_signal_handler(SIGFPE, true);
3397 set_signal_handler(SIGTRAP, true);
3398 set_signal_handler(SIGXFSZ, true);
3399 set_signal_handler(SIGDANGER, true);
3400
3401 if (libjsig_is_loaded) {
3402 // Tell libjsig jvm finishes setting signal handlers.
3403 (*end_signal_setting)();
3404 }
3405
3406 // We don't activate signal checker if libjsig is in place, we trust ourselves
3407 // and if UserSignalHandler is installed all bets are off.
3408 // Log that signal checking is off only if -verbose:jni is specified.
3409 if (CheckJNICalls) {
3410 if (libjsig_is_loaded) {
3411 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3412 check_signals = false;
3413 }
3414 if (AllowUserSignalHandlers) {
3415 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3416 check_signals = false;
3417 }
3418 // Need to initialize check_signal_done.
3419 ::sigemptyset(&check_signal_done);
3420 }
3421 }
3422 }
3423
3424 static const char* get_signal_handler_name(address handler,
3425 char* buf, int buflen) {
3426 int offset;
3427 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3428 if (found) {
3429 // skip directory names
3430 const char *p1, *p2;
3431 p1 = buf;
3432 size_t len = strlen(os::file_separator());
3433 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3434 // The way os::dll_address_to_library_name is implemented on Aix
3435 // right now, it always returns -1 for the offset which is not
3436 // terribly informative.
3437 // Will fix that. For now, omit the offset.
3438 jio_snprintf(buf, buflen, "%s", p1);
3439 } else {
3440 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3441 }
3442 return buf;
3443 }
3444
3445 static void print_signal_handler(outputStream* st, int sig,
3446 char* buf, size_t buflen) {
3447 struct sigaction sa;
3448 sigaction(sig, NULL, &sa);
3449
3450 st->print("%s: ", os::exception_name(sig, buf, buflen));
3451
3452 address handler = (sa.sa_flags & SA_SIGINFO)
3453 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3454 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3455
3456 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3457 st->print("SIG_DFL");
3458 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3459 st->print("SIG_IGN");
3460 } else {
3461 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3462 }
3463
3464 // Print readable mask.
3465 st->print(", sa_mask[0]=");
3466 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3467
3468 address rh = VMError::get_resetted_sighandler(sig);
3469 // May be, handler was resetted by VMError?
3470 if (rh != NULL) {
3471 handler = rh;
3472 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3473 }
3474
3475 // Print textual representation of sa_flags.
3476 st->print(", sa_flags=");
3477 os::Posix::print_sa_flags(st, sa.sa_flags);
3478
3479 // Check: is it our handler?
3480 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3481 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3482 // It is our signal handler.
3483 // Check for flags, reset system-used one!
3484 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3485 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3486 os::Aix::get_our_sigflags(sig));
3487 }
3488 }
3489 st->cr();
3490 }
3491
3492 #define DO_SIGNAL_CHECK(sig) \
3493 if (!sigismember(&check_signal_done, sig)) \
3494 os::Aix::check_signal_handler(sig)
3495
3496 // This method is a periodic task to check for misbehaving JNI applications
3497 // under CheckJNI, we can add any periodic checks here
3498
3499 void os::run_periodic_checks() {
3500
3501 if (check_signals == false) return;
3502
3503 // SEGV and BUS if overridden could potentially prevent
3504 // generation of hs*.log in the event of a crash, debugging
3505 // such a case can be very challenging, so we absolutely
3506 // check the following for a good measure:
3507 DO_SIGNAL_CHECK(SIGSEGV);
3508 DO_SIGNAL_CHECK(SIGILL);
3509 DO_SIGNAL_CHECK(SIGFPE);
3510 DO_SIGNAL_CHECK(SIGBUS);
3511 DO_SIGNAL_CHECK(SIGPIPE);
3512 DO_SIGNAL_CHECK(SIGXFSZ);
3513 if (UseSIGTRAP) {
3514 DO_SIGNAL_CHECK(SIGTRAP);
3515 }
3516 DO_SIGNAL_CHECK(SIGDANGER);
3517
3518 // ReduceSignalUsage allows the user to override these handlers
3519 // see comments at the very top and jvm_solaris.h
3520 if (!ReduceSignalUsage) {
3521 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3522 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3523 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3524 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3525 }
3526
3527 DO_SIGNAL_CHECK(SR_signum);
3528 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3529 }
3530
3531 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3532
3533 static os_sigaction_t os_sigaction = NULL;
3534
3535 void os::Aix::check_signal_handler(int sig) {
3536 char buf[O_BUFLEN];
3537 address jvmHandler = NULL;
3538
3539 struct sigaction act;
3540 if (os_sigaction == NULL) {
3541 // only trust the default sigaction, in case it has been interposed
3542 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3543 if (os_sigaction == NULL) return;
3544 }
3545
3546 os_sigaction(sig, (struct sigaction*)NULL, &act);
3547
3548 address thisHandler = (act.sa_flags & SA_SIGINFO)
3549 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3550 : CAST_FROM_FN_PTR(address, act.sa_handler);
3551
3552 switch(sig) {
3553 case SIGSEGV:
3554 case SIGBUS:
3555 case SIGFPE:
3556 case SIGPIPE:
3557 case SIGILL:
3558 case SIGXFSZ:
3559 // Renamed 'signalHandler' to avoid collision with other shared libs.
3560 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3561 break;
3562
3563 case SHUTDOWN1_SIGNAL:
3564 case SHUTDOWN2_SIGNAL:
3565 case SHUTDOWN3_SIGNAL:
3566 case BREAK_SIGNAL:
3567 jvmHandler = (address)user_handler();
3568 break;
3569
3570 case INTERRUPT_SIGNAL:
3571 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3572 break;
3573
3574 default:
3575 if (sig == SR_signum) {
3576 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3577 } else {
3578 return;
3579 }
3580 break;
3581 }
3582
3583 if (thisHandler != jvmHandler) {
3584 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3585 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3586 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3587 // No need to check this sig any longer
3588 sigaddset(&check_signal_done, sig);
3589 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3590 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3591 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3592 exception_name(sig, buf, O_BUFLEN));
3593 }
3594 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3595 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3596 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3597 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3598 // No need to check this sig any longer
3599 sigaddset(&check_signal_done, sig);
3600 }
3601
3602 // Dump all the signal
3603 if (sigismember(&check_signal_done, sig)) {
3604 print_signal_handlers(tty, buf, O_BUFLEN);
3605 }
3606 }
3607
3608 extern bool signal_name(int signo, char* buf, size_t len);
3609
3610 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3611 if (0 < exception_code && exception_code <= SIGRTMAX) {
3612 // signal
3613 if (!signal_name(exception_code, buf, size)) {
3614 jio_snprintf(buf, size, "SIG%d", exception_code);
3615 }
3616 return buf;
3617 } else {
3618 return NULL;
3619 }
3620 }
3621
3622 // To install functions for atexit system call
3623 extern "C" {
3624 static void perfMemory_exit_helper() {
3625 perfMemory_exit();
3626 }
3627 }
3628
3629 // This is called _before_ the most of global arguments have been parsed.
3630 void os::init(void) {
3631 // This is basic, we want to know if that ever changes.
3632 // (shared memory boundary is supposed to be a 256M aligned)
3633 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3634
3635 // First off, we need to know whether we run on AIX or PASE, and
3636 // the OS level we run on.
3637 os::Aix::initialize_os_info();
3638
3639 // Scan environment (SPEC1170 behaviour, etc)
3640 os::Aix::scan_environment();
3641
3642 // Check which pages are supported by AIX.
3643 os::Aix::query_multipage_support();
3644
3645 // Next, we need to initialize libo4 and libperfstat libraries.
3646 if (os::Aix::on_pase()) {
3647 os::Aix::initialize_libo4();
3648 } else {
3649 os::Aix::initialize_libperfstat();
3650 }
3651
3652 // Reset the perfstat information provided by ODM.
3653 if (os::Aix::on_aix()) {
3654 libperfstat::perfstat_reset();
3655 }
3656
3657 // Now initialze basic system properties. Note that for some of the values we
3658 // need libperfstat etc.
3659 os::Aix::initialize_system_info();
3660
3661 // Initialize large page support.
3662 if (UseLargePages) {
3663 os::large_page_init();
3664 if (!UseLargePages) {
3665 // initialize os::_page_sizes
3666 _page_sizes[0] = Aix::page_size();
3667 _page_sizes[1] = 0;
3668 if (Verbose) {
3669 fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n");
3670 }
3671 }
3672 } else {
3673 // initialize os::_page_sizes
3674 _page_sizes[0] = Aix::page_size();
3675 _page_sizes[1] = 0;
3676 }
3677
3678 // debug trace
3679 if (Verbose) {
3680 fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size());
3681 fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size());
3682 fprintf(stderr, "os::_page_sizes = ( ");
3683 for (int i = 0; _page_sizes[i]; i ++) {
3684 fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i]));
3685 }
3686 fprintf(stderr, ")\n");
3687 }
3688
3689 _initial_pid = getpid();
3690
3691 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3692
3693 init_random(1234567);
3694
3695 ThreadCritical::initialize();
3696
3697 // Main_thread points to the aboriginal thread.
3698 Aix::_main_thread = pthread_self();
3699
3700 initial_time_count = os::elapsed_counter();
3701 pthread_mutex_init(&dl_mutex, NULL);
3702 }
3703
3704 // This is called _after_ the global arguments have been parsed.
3705 jint os::init_2(void) {
3706
3707 trcVerbose("processor count: %d", os::_processor_count);
3708 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3709
3710 // Initially build up the loaded dll map.
3711 LoadedLibraries::reload();
3712
3713 const int page_size = Aix::page_size();
3714 const int map_size = page_size;
3715
3716 address map_address = (address) MAP_FAILED;
3717 const int prot = PROT_READ;
3718 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3719
3720 // use optimized addresses for the polling page,
3721 // e.g. map it to a special 32-bit address.
3722 if (OptimizePollingPageLocation) {
3723 // architecture-specific list of address wishes:
3724 address address_wishes[] = {
3725 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3726 // PPC64: all address wishes are non-negative 32 bit values where
3727 // the lower 16 bits are all zero. we can load these addresses
3728 // with a single ppc_lis instruction.
3729 (address) 0x30000000, (address) 0x31000000,
3730 (address) 0x32000000, (address) 0x33000000,
3731 (address) 0x40000000, (address) 0x41000000,
3732 (address) 0x42000000, (address) 0x43000000,
3733 (address) 0x50000000, (address) 0x51000000,
3734 (address) 0x52000000, (address) 0x53000000,
3735 (address) 0x60000000, (address) 0x61000000,
3736 (address) 0x62000000, (address) 0x63000000
3737 };
3738 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3739
3740 // iterate over the list of address wishes:
3741 for (int i=0; i<address_wishes_length; i++) {
3742 // try to map with current address wish.
3743 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3744 // fail if the address is already mapped.
3745 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3746 map_size, prot,
3747 flags | MAP_FIXED,
3748 -1, 0);
3749 if (Verbose) {
3750 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3751 address_wishes[i], map_address + (ssize_t)page_size);
3752 }
3753
3754 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3755 // map succeeded and map_address is at wished address, exit loop.
3756 break;
3757 }
3758
3759 if (map_address != (address) MAP_FAILED) {
3760 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3761 ::munmap(map_address, map_size);
3762 map_address = (address) MAP_FAILED;
3763 }
3764 // map failed, continue loop.
3765 }
3766 } // end OptimizePollingPageLocation
3767
3768 if (map_address == (address) MAP_FAILED) {
3769 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3770 }
3771 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3772 os::set_polling_page(map_address);
3773
3774 if (!UseMembar) {
3775 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3776 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3777 os::set_memory_serialize_page(mem_serialize_page);
3778
3779 #ifndef PRODUCT
3780 if (Verbose && PrintMiscellaneous)
3781 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3782 #endif
3783 }
3784
3785 // initialize suspend/resume support - must do this before signal_sets_init()
3786 if (SR_initialize() != 0) {
3787 perror("SR_initialize failed");
3788 return JNI_ERR;
3789 }
3790
3791 Aix::signal_sets_init();
3792 Aix::install_signal_handlers();
3793
3794 // Check minimum allowable stack size for thread creation and to initialize
3795 // the java system classes, including StackOverflowError - depends on page
3796 // size. Add a page for compiler2 recursion in main thread.
3797 // Add in 2*BytesPerWord times page size to account for VM stack during
3798 // class initialization depending on 32 or 64 bit VM.
3799 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3800 (size_t)(StackYellowPages+StackRedPages+StackShadowPages +
3801 2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size());
3802
3803 size_t threadStackSizeInBytes = ThreadStackSize * K;
3804 if (threadStackSizeInBytes != 0 &&
3805 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3806 tty->print_cr("\nThe stack size specified is too small, "
3807 "Specify at least %dk",
3808 os::Aix::min_stack_allowed / K);
3809 return JNI_ERR;
3810 }
3811
3812 // Make the stack size a multiple of the page size so that
3813 // the yellow/red zones can be guarded.
3814 // Note that this can be 0, if no default stacksize was set.
3815 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3816
3817 Aix::libpthread_init();
3818
3819 if (MaxFDLimit) {
3820 // set the number of file descriptors to max. print out error
3821 // if getrlimit/setrlimit fails but continue regardless.
3822 struct rlimit nbr_files;
3823 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3824 if (status != 0) {
3825 if (PrintMiscellaneous && (Verbose || WizardMode))
3826 perror("os::init_2 getrlimit failed");
3827 } else {
3828 nbr_files.rlim_cur = nbr_files.rlim_max;
3829 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3830 if (status != 0) {
3831 if (PrintMiscellaneous && (Verbose || WizardMode))
3832 perror("os::init_2 setrlimit failed");
3833 }
3834 }
3835 }
3836
3837 if (PerfAllowAtExitRegistration) {
3838 // only register atexit functions if PerfAllowAtExitRegistration is set.
3839 // atexit functions can be delayed until process exit time, which
3840 // can be problematic for embedded VM situations. Embedded VMs should
3841 // call DestroyJavaVM() to assure that VM resources are released.
3842
3843 // note: perfMemory_exit_helper atexit function may be removed in
3844 // the future if the appropriate cleanup code can be added to the
3845 // VM_Exit VMOperation's doit method.
3846 if (atexit(perfMemory_exit_helper) != 0) {
3847 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3848 }
3849 }
3850
3851 return JNI_OK;
3852 }
3853
3854 // Mark the polling page as unreadable
3855 void os::make_polling_page_unreadable(void) {
3856 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3857 fatal("Could not disable polling page");
3858 }
3859 };
3860
3861 // Mark the polling page as readable
3862 void os::make_polling_page_readable(void) {
3863 // Changed according to os_linux.cpp.
3864 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3865 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
3866 }
3867 };
3868
3869 int os::active_processor_count() {
3870 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3871 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3872 return online_cpus;
3873 }
3874
3875 void os::set_native_thread_name(const char *name) {
3876 // Not yet implemented.
3877 return;
3878 }
3879
3880 bool os::distribute_processes(uint length, uint* distribution) {
3881 // Not yet implemented.
3882 return false;
3883 }
3884
3885 bool os::bind_to_processor(uint processor_id) {
3886 // Not yet implemented.
3887 return false;
3888 }
3889
3890 void os::SuspendedThreadTask::internal_do_task() {
3891 if (do_suspend(_thread->osthread())) {
3892 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3893 do_task(context);
3894 do_resume(_thread->osthread());
3895 }
3896 }
3897
3898 class PcFetcher : public os::SuspendedThreadTask {
3899 public:
3900 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3901 ExtendedPC result();
3902 protected:
3903 void do_task(const os::SuspendedThreadTaskContext& context);
3904 private:
3905 ExtendedPC _epc;
3906 };
3907
3908 ExtendedPC PcFetcher::result() {
3909 guarantee(is_done(), "task is not done yet.");
3910 return _epc;
3911 }
3912
3913 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3914 Thread* thread = context.thread();
3915 OSThread* osthread = thread->osthread();
3916 if (osthread->ucontext() != NULL) {
3917 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3918 } else {
3919 // NULL context is unexpected, double-check this is the VMThread.
3920 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3921 }
3922 }
3923
3924 // Suspends the target using the signal mechanism and then grabs the PC before
3925 // resuming the target. Used by the flat-profiler only
3926 ExtendedPC os::get_thread_pc(Thread* thread) {
3927 // Make sure that it is called by the watcher for the VMThread.
3928 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3929 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3930
3931 PcFetcher fetcher(thread);
3932 fetcher.run();
3933 return fetcher.result();
3934 }
3935
3936 // Not neede on Aix.
3937 // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) {
3938 // }
3939
3940 ////////////////////////////////////////////////////////////////////////////////
3941 // debug support
3942
3943 static address same_page(address x, address y) {
3944 intptr_t page_bits = -os::vm_page_size();
3945 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3946 return x;
3947 else if (x > y)
3948 return (address)(intptr_t(y) | ~page_bits) + 1;
3949 else
3950 return (address)(intptr_t(y) & page_bits);
3951 }
3952
3953 bool os::find(address addr, outputStream* st) {
3954
3955 st->print(PTR_FORMAT ": ", addr);
3956
3957 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3958 if (lib) {
3959 lib->print(st);
3960 return true;
3961 } else {
3962 lib = LoadedLibraries::find_for_data_address(addr);
3963 if (lib) {
3964 lib->print(st);
3965 return true;
3966 } else {
3967 st->print_cr("(outside any module)");
3968 }
3969 }
3970
3971 return false;
3972 }
3973
3974 ////////////////////////////////////////////////////////////////////////////////
3975 // misc
3976
3977 // This does not do anything on Aix. This is basically a hook for being
3978 // able to use structured exception handling (thread-local exception filters)
3979 // on, e.g., Win32.
3980 void
3981 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3982 JavaCallArguments* args, Thread* thread) {
3983 f(value, method, args, thread);
3984 }
3985
3986 void os::print_statistics() {
3987 }
3988
3989 int os::message_box(const char* title, const char* message) {
3990 int i;
3991 fdStream err(defaultStream::error_fd());
3992 for (i = 0; i < 78; i++) err.print_raw("=");
3993 err.cr();
3994 err.print_raw_cr(title);
3995 for (i = 0; i < 78; i++) err.print_raw("-");
3996 err.cr();
3997 err.print_raw_cr(message);
3998 for (i = 0; i < 78; i++) err.print_raw("=");
3999 err.cr();
4000
4001 char buf[16];
4002 // Prevent process from exiting upon "read error" without consuming all CPU
4003 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4004
4005 return buf[0] == 'y' || buf[0] == 'Y';
4006 }
4007
4008 int os::stat(const char *path, struct stat *sbuf) {
4009 char pathbuf[MAX_PATH];
4010 if (strlen(path) > MAX_PATH - 1) {
4011 errno = ENAMETOOLONG;
4012 return -1;
4013 }
4014 os::native_path(strcpy(pathbuf, path));
4015 return ::stat(pathbuf, sbuf);
4016 }
4017
4018 bool os::check_heap(bool force) {
4019 return true;
4020 }
4021
4022 // Is a (classpath) directory empty?
4023 bool os::dir_is_empty(const char* path) {
4024 DIR *dir = NULL;
4025 struct dirent *ptr;
4026
4027 dir = opendir(path);
4028 if (dir == NULL) return true;
4029
4030 /* Scan the directory */
4031 bool result = true;
4032 char buf[sizeof(struct dirent) + MAX_PATH];
4033 while (result && (ptr = ::readdir(dir)) != NULL) {
4034 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4035 result = false;
4036 }
4037 }
4038 closedir(dir);
4039 return result;
4040 }
4041
4042 // This code originates from JDK's sysOpen and open64_w
4043 // from src/solaris/hpi/src/system_md.c
4044
4045 int os::open(const char *path, int oflag, int mode) {
4046
4047 if (strlen(path) > MAX_PATH - 1) {
4048 errno = ENAMETOOLONG;
4049 return -1;
4050 }
4051 int fd;
4052
4053 fd = ::open64(path, oflag, mode);
4054 if (fd == -1) return -1;
4055
4056 // If the open succeeded, the file might still be a directory.
4057 {
4058 struct stat64 buf64;
4059 int ret = ::fstat64(fd, &buf64);
4060 int st_mode = buf64.st_mode;
4061
4062 if (ret != -1) {
4063 if ((st_mode & S_IFMT) == S_IFDIR) {
4064 errno = EISDIR;
4065 ::close(fd);
4066 return -1;
4067 }
4068 } else {
4069 ::close(fd);
4070 return -1;
4071 }
4072 }
4073
4074 // All file descriptors that are opened in the JVM and not
4075 // specifically destined for a subprocess should have the
4076 // close-on-exec flag set. If we don't set it, then careless 3rd
4077 // party native code might fork and exec without closing all
4078 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4079 // UNIXProcess.c), and this in turn might:
4080 //
4081 // - cause end-of-file to fail to be detected on some file
4082 // descriptors, resulting in mysterious hangs, or
4083 //
4084 // - might cause an fopen in the subprocess to fail on a system
4085 // suffering from bug 1085341.
4086 //
4087 // (Yes, the default setting of the close-on-exec flag is a Unix
4088 // design flaw.)
4089 //
4090 // See:
4091 // 1085341: 32-bit stdio routines should support file descriptors >255
4092 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4093 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4094 #ifdef FD_CLOEXEC
4095 {
4096 int flags = ::fcntl(fd, F_GETFD);
4097 if (flags != -1)
4098 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4099 }
4100 #endif
4101
4102 return fd;
4103 }
4104
4105 // create binary file, rewriting existing file if required
4106 int os::create_binary_file(const char* path, bool rewrite_existing) {
4107 int oflags = O_WRONLY | O_CREAT;
4108 if (!rewrite_existing) {
4109 oflags |= O_EXCL;
4110 }
4111 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4112 }
4113
4114 // return current position of file pointer
4115 jlong os::current_file_offset(int fd) {
4116 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4117 }
4118
4119 // move file pointer to the specified offset
4120 jlong os::seek_to_file_offset(int fd, jlong offset) {
4121 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4122 }
4123
4124 // This code originates from JDK's sysAvailable
4125 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4126
4127 int os::available(int fd, jlong *bytes) {
4128 jlong cur, end;
4129 int mode;
4130 struct stat64 buf64;
4131
4132 if (::fstat64(fd, &buf64) >= 0) {
4133 mode = buf64.st_mode;
4134 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4135 // XXX: is the following call interruptible? If so, this might
4136 // need to go through the INTERRUPT_IO() wrapper as for other
4137 // blocking, interruptible calls in this file.
4138 int n;
4139 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4140 *bytes = n;
4141 return 1;
4142 }
4143 }
4144 }
4145 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4146 return 0;
4147 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4148 return 0;
4149 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4150 return 0;
4151 }
4152 *bytes = end - cur;
4153 return 1;
4154 }
4155
4156 // Map a block of memory.
4157 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4158 char *addr, size_t bytes, bool read_only,
4159 bool allow_exec) {
4160 int prot;
4161 int flags = MAP_PRIVATE;
4162
4163 if (read_only) {
4164 prot = PROT_READ;
4165 } else {
4166 prot = PROT_READ | PROT_WRITE;
4167 }
4168
4169 if (allow_exec) {
4170 prot |= PROT_EXEC;
4171 }
4172
4173 if (addr != NULL) {
4174 flags |= MAP_FIXED;
4175 }
4176
4177 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags,
4178 fd, file_offset);
4179 if (mapped_address == MAP_FAILED) {
4180 return NULL;
4181 }
4182 return mapped_address;
4183 }
4184
4185 // Remap a block of memory.
4186 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4187 char *addr, size_t bytes, bool read_only,
4188 bool allow_exec) {
4189 // same as map_memory() on this OS
4190 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4191 allow_exec);
4192 }
4193
4194 // Unmap a block of memory.
4195 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4196 return munmap(addr, bytes) == 0;
4197 }
4198
4199 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4200 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4201 // of a thread.
4202 //
4203 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4204 // the fast estimate available on the platform.
4205
4206 jlong os::current_thread_cpu_time() {
4207 // return user + sys since the cost is the same
4208 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4209 assert(n >= 0, "negative CPU time");
4210 return n;
4211 }
4212
4213 jlong os::thread_cpu_time(Thread* thread) {
4214 // consistent with what current_thread_cpu_time() returns
4215 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4216 assert(n >= 0, "negative CPU time");
4217 return n;
4218 }
4219
4220 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4221 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4222 assert(n >= 0, "negative CPU time");
4223 return n;
4224 }
4225
4226 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4227 bool error = false;
4228
4229 jlong sys_time = 0;
4230 jlong user_time = 0;
4231
4232 // Reimplemented using getthrds64().
4233 //
4234 // Works like this:
4235 // For the thread in question, get the kernel thread id. Then get the
4236 // kernel thread statistics using that id.
4237 //
4238 // This only works of course when no pthread scheduling is used,
4239 // i.e. there is a 1:1 relationship to kernel threads.
4240 // On AIX, see AIXTHREAD_SCOPE variable.
4241
4242 pthread_t pthtid = thread->osthread()->pthread_id();
4243
4244 // retrieve kernel thread id for the pthread:
4245 tid64_t tid = 0;
4246 struct __pthrdsinfo pinfo;
4247 // I just love those otherworldly IBM APIs which force me to hand down
4248 // dummy buffers for stuff I dont care for...
4249 char dummy[1];
4250 int dummy_size = sizeof(dummy);
4251 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4252 dummy, &dummy_size) == 0) {
4253 tid = pinfo.__pi_tid;
4254 } else {
4255 tty->print_cr("pthread_getthrds_np failed.");
4256 error = true;
4257 }
4258
4259 // retrieve kernel timing info for that kernel thread
4260 if (!error) {
4261 struct thrdentry64 thrdentry;
4262 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4263 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4264 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4265 } else {
4266 tty->print_cr("pthread_getthrds_np failed.");
4267 error = true;
4268 }
4269 }
4270
4271 if (p_sys_time) {
4272 *p_sys_time = sys_time;
4273 }
4274
4275 if (p_user_time) {
4276 *p_user_time = user_time;
4277 }
4278
4279 if (error) {
4280 return false;
4281 }
4282
4283 return true;
4284 }
4285
4286 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4287 jlong sys_time;
4288 jlong user_time;
4289
4290 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4291 return -1;
4292 }
4293
4294 return user_sys_cpu_time ? sys_time + user_time : user_time;
4295 }
4296
4297 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4298 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4299 info_ptr->may_skip_backward = false; // elapsed time not wall time
4300 info_ptr->may_skip_forward = false; // elapsed time not wall time
4301 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4302 }
4303
4304 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4305 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4306 info_ptr->may_skip_backward = false; // elapsed time not wall time
4307 info_ptr->may_skip_forward = false; // elapsed time not wall time
4308 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4309 }
4310
4311 bool os::is_thread_cpu_time_supported() {
4312 return true;
4313 }
4314
4315 // System loadavg support. Returns -1 if load average cannot be obtained.
4316 // For now just return the system wide load average (no processor sets).
4317 int os::loadavg(double values[], int nelem) {
4318
4319 // Implemented using libperfstat on AIX.
4320
4321 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4322 guarantee(values, "argument error");
4323
4324 if (os::Aix::on_pase()) {
4325 Unimplemented();
4326 return -1;
4327 } else {
4328 // AIX: use libperfstat
4329 //
4330 // See also:
4331 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4332 // /usr/include/libperfstat.h:
4333
4334 // Use the already AIX version independent get_cpuinfo.
4335 os::Aix::cpuinfo_t ci;
4336 if (os::Aix::get_cpuinfo(&ci)) {
4337 for (int i = 0; i < nelem; i++) {
4338 values[i] = ci.loadavg[i];
4339 }
4340 } else {
4341 return -1;
4342 }
4343 return nelem;
4344 }
4345 }
4346
4347 void os::pause() {
4348 char filename[MAX_PATH];
4349 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4350 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4351 } else {
4352 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4353 }
4354
4355 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4356 if (fd != -1) {
4357 struct stat buf;
4358 ::close(fd);
4359 while (::stat(filename, &buf) == 0) {
4360 (void)::poll(NULL, 0, 100);
4361 }
4362 } else {
4363 jio_fprintf(stderr,
4364 "Could not open pause file '%s', continuing immediately.\n", filename);
4365 }
4366 }
4367
4368 bool os::Aix::is_primordial_thread() {
4369 if (pthread_self() == (pthread_t)1) {
4370 return true;
4371 } else {
4372 return false;
4373 }
4374 }
4375
4376 // OS recognitions (PASE/AIX, OS level) call this before calling any
4377 // one of Aix::on_pase(), Aix::os_version() static
4378 void os::Aix::initialize_os_info() {
4379
4380 assert(_on_pase == -1 && _os_version == -1, "already called.");
4381
4382 struct utsname uts;
4383 memset(&uts, 0, sizeof(uts));
4384 strcpy(uts.sysname, "?");
4385 if (::uname(&uts) == -1) {
4386 trc("uname failed (%d)", errno);
4387 guarantee(0, "Could not determine whether we run on AIX or PASE");
4388 } else {
4389 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4390 "node \"%s\" machine \"%s\"\n",
4391 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4392 const int major = atoi(uts.version);
4393 assert(major > 0, "invalid OS version");
4394 const int minor = atoi(uts.release);
4395 assert(minor > 0, "invalid OS release");
4396 _os_version = (major << 8) | minor;
4397 if (strcmp(uts.sysname, "OS400") == 0) {
4398 Unimplemented();
4399 } else if (strcmp(uts.sysname, "AIX") == 0) {
4400 // We run on AIX. We do not support versions older than AIX 5.3.
4401 _on_pase = 0;
4402 if (_os_version < 0x0503) {
4403 trc("AIX release older than AIX 5.3 not supported.");
4404 assert(false, "AIX release too old.");
4405 } else {
4406 trcVerbose("We run on AIX %d.%d\n", major, minor);
4407 }
4408 } else {
4409 assert(false, "unknown OS");
4410 }
4411 }
4412
4413 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4414 } // end: os::Aix::initialize_os_info()
4415
4416 // Scan environment for important settings which might effect the VM.
4417 // Trace out settings. Warn about invalid settings and/or correct them.
4418 //
4419 // Must run after os::Aix::initialue_os_info().
4420 void os::Aix::scan_environment() {
4421
4422 char* p;
4423 int rc;
4424
4425 // Warn explicity if EXTSHM=ON is used. That switch changes how
4426 // System V shared memory behaves. One effect is that page size of
4427 // shared memory cannot be change dynamically, effectivly preventing
4428 // large pages from working.
4429 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4430 // recommendation is (in OSS notes) to switch it off.
4431 p = ::getenv("EXTSHM");
4432 if (Verbose) {
4433 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4434 }
4435 if (p && strcmp(p, "ON") == 0) {
4436 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4437 _extshm = 1;
4438 } else {
4439 _extshm = 0;
4440 }
4441
4442 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4443 // Not tested, not supported.
4444 //
4445 // Note that it might be worth the trouble to test and to require it, if only to
4446 // get useful return codes for mprotect.
4447 //
4448 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4449 // exec() ? before loading the libjvm ? ....)
4450 p = ::getenv("XPG_SUS_ENV");
4451 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4452 if (p && strcmp(p, "ON") == 0) {
4453 _xpg_sus_mode = 1;
4454 trc("Unsupported setting: XPG_SUS_ENV=ON");
4455 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4456 // clobber address ranges. If we ever want to support that, we have to do some
4457 // testing first.
4458 guarantee(false, "XPG_SUS_ENV=ON not supported");
4459 } else {
4460 _xpg_sus_mode = 0;
4461 }
4462
4463 // Switch off AIX internal (pthread) guard pages. This has
4464 // immediate effect for any pthread_create calls which follow.
4465 p = ::getenv("AIXTHREAD_GUARDPAGES");
4466 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4467 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4468 guarantee(rc == 0, "");
4469
4470 } // end: os::Aix::scan_environment()
4471
4472 // PASE: initialize the libo4 library (AS400 PASE porting library).
4473 void os::Aix::initialize_libo4() {
4474 Unimplemented();
4475 }
4476
4477 // AIX: initialize the libperfstat library (we load this dynamically
4478 // because it is only available on AIX.
4479 void os::Aix::initialize_libperfstat() {
4480
4481 assert(os::Aix::on_aix(), "AIX only");
4482
4483 if (!libperfstat::init()) {
4484 trc("libperfstat initialization failed.");
4485 assert(false, "libperfstat initialization failed");
4486 } else {
4487 if (Verbose) {
4488 fprintf(stderr, "libperfstat initialized.\n");
4489 }
4490 }
4491 } // end: os::Aix::initialize_libperfstat
4492
4493 /////////////////////////////////////////////////////////////////////////////
4494 // thread stack
4495
4496 // function to query the current stack size using pthread_getthrds_np
4497 //
4498 // ! do not change anything here unless you know what you are doing !
4499 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4500
4501 // This only works when invoked on a pthread. As we agreed not to use
4502 // primordial threads anyway, I assert here
4503 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4504
4505 // information about this api can be found (a) in the pthread.h header and
4506 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4507 //
4508 // The use of this API to find out the current stack is kind of undefined.
4509 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4510 // enough for cases where I let the pthread library create its stacks. For cases
4511 // where I create an own stack and pass this to pthread_create, it seems not to
4512 // work (the returned stack size in that case is 0).
4513
4514 pthread_t tid = pthread_self();
4515 struct __pthrdsinfo pinfo;
4516 char dummy[1]; // we only need this to satisfy the api and to not get E
4517 int dummy_size = sizeof(dummy);
4518
4519 memset(&pinfo, 0, sizeof(pinfo));
4520
4521 const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4522 sizeof(pinfo), dummy, &dummy_size);
4523
4524 if (rc != 0) {
4525 fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc);
4526 guarantee(0, "pthread_getthrds_np failed");
4527 }
4528
4529 guarantee(pinfo.__pi_stackend, "returned stack base invalid");
4530
4531 // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack
4532 // (when handing down a stack to pthread create, see pthread_attr_setstackaddr).
4533 // Not sure what to do here - I feel inclined to forbid this use case completely.
4534 guarantee(pinfo.__pi_stacksize, "returned stack size invalid");
4535
4536 // On AIX, stacks are not necessarily page aligned so round the base and size accordingly
4537 if (p_stack_base) {
4538 (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size());
4539 }
4540
4541 if (p_stack_size) {
4542 (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size();
4543 }
4544
4545 #ifndef PRODUCT
4546 if (Verbose) {
4547 fprintf(stderr,
4548 "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT
4549 ", real stack_size=" INTPTR_FORMAT
4550 ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n",
4551 (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize,
4552 (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()),
4553 pinfo.__pi_stacksize - os::Aix::stack_page_size());
4554 }
4555 #endif
4556
4557 } // end query_stack_dimensions
4558
4559 // get the current stack base from the OS (actually, the pthread library)
4560 address os::current_stack_base() {
4561 address p;
4562 query_stack_dimensions(&p, 0);
4563 return p;
4564 }
4565
4566 // get the current stack size from the OS (actually, the pthread library)
4567 size_t os::current_stack_size() {
4568 size_t s;
4569 query_stack_dimensions(0, &s);
4570 return s;
4571 }
4572
4573 // Refer to the comments in os_solaris.cpp park-unpark.
4574 //
4575 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4576 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4577 // For specifics regarding the bug see GLIBC BUGID 261237 :
4578 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4579 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4580 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4581 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4582 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4583 // and monitorenter when we're using 1-0 locking. All those operations may result in
4584 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4585 // of libpthread avoids the problem, but isn't practical.
4586 //
4587 // Possible remedies:
4588 //
4589 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4590 // This is palliative and probabilistic, however. If the thread is preempted
4591 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4592 // than the minimum period may have passed, and the abstime may be stale (in the
4593 // past) resultin in a hang. Using this technique reduces the odds of a hang
4594 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4595 //
4596 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4597 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4598 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4599 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4600 // thread.
4601 //
4602 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4603 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4604 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4605 // This also works well. In fact it avoids kernel-level scalability impediments
4606 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4607 // timers in a graceful fashion.
4608 //
4609 // 4. When the abstime value is in the past it appears that control returns
4610 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4611 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4612 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4613 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4614 // It may be possible to avoid reinitialization by checking the return
4615 // value from pthread_cond_timedwait(). In addition to reinitializing the
4616 // condvar we must establish the invariant that cond_signal() is only called
4617 // within critical sections protected by the adjunct mutex. This prevents
4618 // cond_signal() from "seeing" a condvar that's in the midst of being
4619 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4620 // desirable signal-after-unlock optimization that avoids futile context switching.
4621 //
4622 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4623 // structure when a condvar is used or initialized. cond_destroy() would
4624 // release the helper structure. Our reinitialize-after-timedwait fix
4625 // put excessive stress on malloc/free and locks protecting the c-heap.
4626 //
4627 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4628 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4629 // and only enabling the work-around for vulnerable environments.
4630
4631 // utility to compute the abstime argument to timedwait:
4632 // millis is the relative timeout time
4633 // abstime will be the absolute timeout time
4634 // TODO: replace compute_abstime() with unpackTime()
4635
4636 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4637 if (millis < 0) millis = 0;
4638 struct timeval now;
4639 int status = gettimeofday(&now, NULL);
4640 assert(status == 0, "gettimeofday");
4641 jlong seconds = millis / 1000;
4642 millis %= 1000;
4643 if (seconds > 50000000) { // see man cond_timedwait(3T)
4644 seconds = 50000000;
4645 }
4646 abstime->tv_sec = now.tv_sec + seconds;
4647 long usec = now.tv_usec + millis * 1000;
4648 if (usec >= 1000000) {
4649 abstime->tv_sec += 1;
4650 usec -= 1000000;
4651 }
4652 abstime->tv_nsec = usec * 1000;
4653 return abstime;
4654 }
4655
4656 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4657 // Conceptually TryPark() should be equivalent to park(0).
4658
4659 int os::PlatformEvent::TryPark() {
4660 for (;;) {
4661 const int v = _Event;
4662 guarantee ((v == 0) || (v == 1), "invariant");
4663 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4664 }
4665 }
4666
4667 void os::PlatformEvent::park() { // AKA "down()"
4668 // Invariant: Only the thread associated with the Event/PlatformEvent
4669 // may call park().
4670 // TODO: assert that _Assoc != NULL or _Assoc == Self
4671 int v;
4672 for (;;) {
4673 v = _Event;
4674 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4675 }
4676 guarantee (v >= 0, "invariant");
4677 if (v == 0) {
4678 // Do this the hard way by blocking ...
4679 int status = pthread_mutex_lock(_mutex);
4680 assert_status(status == 0, status, "mutex_lock");
4681 guarantee (_nParked == 0, "invariant");
4682 ++ _nParked;
4683 while (_Event < 0) {
4684 status = pthread_cond_wait(_cond, _mutex);
4685 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4686 }
4687 -- _nParked;
4688
4689 // In theory we could move the ST of 0 into _Event past the unlock(),
4690 // but then we'd need a MEMBAR after the ST.
4691 _Event = 0;
4692 status = pthread_mutex_unlock(_mutex);
4693 assert_status(status == 0, status, "mutex_unlock");
4694 }
4695 guarantee (_Event >= 0, "invariant");
4696 }
4697
4698 int os::PlatformEvent::park(jlong millis) {
4699 guarantee (_nParked == 0, "invariant");
4700
4701 int v;
4702 for (;;) {
4703 v = _Event;
4704 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4705 }
4706 guarantee (v >= 0, "invariant");
4707 if (v != 0) return OS_OK;
4708
4709 // We do this the hard way, by blocking the thread.
4710 // Consider enforcing a minimum timeout value.
4711 struct timespec abst;
4712 compute_abstime(&abst, millis);
4713
4714 int ret = OS_TIMEOUT;
4715 int status = pthread_mutex_lock(_mutex);
4716 assert_status(status == 0, status, "mutex_lock");
4717 guarantee (_nParked == 0, "invariant");
4718 ++_nParked;
4719
4720 // Object.wait(timo) will return because of
4721 // (a) notification
4722 // (b) timeout
4723 // (c) thread.interrupt
4724 //
4725 // Thread.interrupt and object.notify{All} both call Event::set.
4726 // That is, we treat thread.interrupt as a special case of notification.
4727 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4728 // We assume all ETIME returns are valid.
4729 //
4730 // TODO: properly differentiate simultaneous notify+interrupt.
4731 // In that case, we should propagate the notify to another waiter.
4732
4733 while (_Event < 0) {
4734 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4735 assert_status(status == 0 || status == ETIMEDOUT,
4736 status, "cond_timedwait");
4737 if (!FilterSpuriousWakeups) break; // previous semantics
4738 if (status == ETIMEDOUT) break;
4739 // We consume and ignore EINTR and spurious wakeups.
4740 }
4741 --_nParked;
4742 if (_Event >= 0) {
4743 ret = OS_OK;
4744 }
4745 _Event = 0;
4746 status = pthread_mutex_unlock(_mutex);
4747 assert_status(status == 0, status, "mutex_unlock");
4748 assert (_nParked == 0, "invariant");
4749 return ret;
4750 }
4751
4752 void os::PlatformEvent::unpark() {
4753 int v, AnyWaiters;
4754 for (;;) {
4755 v = _Event;
4756 if (v > 0) {
4757 // The LD of _Event could have reordered or be satisfied
4758 // by a read-aside from this processor's write buffer.
4759 // To avoid problems execute a barrier and then
4760 // ratify the value.
4761 OrderAccess::fence();
4762 if (_Event == v) return;
4763 continue;
4764 }
4765 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4766 }
4767 if (v < 0) {
4768 // Wait for the thread associated with the event to vacate
4769 int status = pthread_mutex_lock(_mutex);
4770 assert_status(status == 0, status, "mutex_lock");
4771 AnyWaiters = _nParked;
4772
4773 if (AnyWaiters != 0) {
4774 // We intentional signal *after* dropping the lock
4775 // to avoid a common class of futile wakeups.
4776 status = pthread_cond_signal(_cond);
4777 assert_status(status == 0, status, "cond_signal");
4778 }
4779 // Mutex should be locked for pthread_cond_signal(_cond).
4780 status = pthread_mutex_unlock(_mutex);
4781 assert_status(status == 0, status, "mutex_unlock");
4782 }
4783
4784 // Note that we signal() _after dropping the lock for "immortal" Events.
4785 // This is safe and avoids a common class of futile wakeups. In rare
4786 // circumstances this can cause a thread to return prematurely from
4787 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4788 // simply re-test the condition and re-park itself.
4789 }
4790
4791
4792 // JSR166
4793 // -------------------------------------------------------
4794
4795 //
4796 // The solaris and linux implementations of park/unpark are fairly
4797 // conservative for now, but can be improved. They currently use a
4798 // mutex/condvar pair, plus a a count.
4799 // Park decrements count if > 0, else does a condvar wait. Unpark
4800 // sets count to 1 and signals condvar. Only one thread ever waits
4801 // on the condvar. Contention seen when trying to park implies that someone
4802 // is unparking you, so don't wait. And spurious returns are fine, so there
4803 // is no need to track notifications.
4804 //
4805
4806 #define MAX_SECS 100000000
4807 //
4808 // This code is common to linux and solaris and will be moved to a
4809 // common place in dolphin.
4810 //
4811 // The passed in time value is either a relative time in nanoseconds
4812 // or an absolute time in milliseconds. Either way it has to be unpacked
4813 // into suitable seconds and nanoseconds components and stored in the
4814 // given timespec structure.
4815 // Given time is a 64-bit value and the time_t used in the timespec is only
4816 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4817 // overflow if times way in the future are given. Further on Solaris versions
4818 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4819 // number of seconds, in abstime, is less than current_time + 100,000,000.
4820 // As it will be 28 years before "now + 100000000" will overflow we can
4821 // ignore overflow and just impose a hard-limit on seconds using the value
4822 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4823 // years from "now".
4824 //
4825
4826 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4827 assert (time > 0, "convertTime");
4828
4829 struct timeval now;
4830 int status = gettimeofday(&now, NULL);
4831 assert(status == 0, "gettimeofday");
4832
4833 time_t max_secs = now.tv_sec + MAX_SECS;
4834
4835 if (isAbsolute) {
4836 jlong secs = time / 1000;
4837 if (secs > max_secs) {
4838 absTime->tv_sec = max_secs;
4839 }
4840 else {
4841 absTime->tv_sec = secs;
4842 }
4843 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4844 }
4845 else {
4846 jlong secs = time / NANOSECS_PER_SEC;
4847 if (secs >= MAX_SECS) {
4848 absTime->tv_sec = max_secs;
4849 absTime->tv_nsec = 0;
4850 }
4851 else {
4852 absTime->tv_sec = now.tv_sec + secs;
4853 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4854 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4855 absTime->tv_nsec -= NANOSECS_PER_SEC;
4856 ++absTime->tv_sec; // note: this must be <= max_secs
4857 }
4858 }
4859 }
4860 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4861 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4862 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4863 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4864 }
4865
4866 void Parker::park(bool isAbsolute, jlong time) {
4867 // Optional fast-path check:
4868 // Return immediately if a permit is available.
4869 if (_counter > 0) {
4870 _counter = 0;
4871 OrderAccess::fence();
4872 return;
4873 }
4874
4875 Thread* thread = Thread::current();
4876 assert(thread->is_Java_thread(), "Must be JavaThread");
4877 JavaThread *jt = (JavaThread *)thread;
4878
4879 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4880 // Check interrupt before trying to wait
4881 if (Thread::is_interrupted(thread, false)) {
4882 return;
4883 }
4884
4885 // Next, demultiplex/decode time arguments
4886 timespec absTime;
4887 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4888 return;
4889 }
4890 if (time > 0) {
4891 unpackTime(&absTime, isAbsolute, time);
4892 }
4893
4894 // Enter safepoint region
4895 // Beware of deadlocks such as 6317397.
4896 // The per-thread Parker:: mutex is a classic leaf-lock.
4897 // In particular a thread must never block on the Threads_lock while
4898 // holding the Parker:: mutex. If safepoints are pending both the
4899 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4900 ThreadBlockInVM tbivm(jt);
4901
4902 // Don't wait if cannot get lock since interference arises from
4903 // unblocking. Also. check interrupt before trying wait
4904 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4905 return;
4906 }
4907
4908 int status;
4909 if (_counter > 0) { // no wait needed
4910 _counter = 0;
4911 status = pthread_mutex_unlock(_mutex);
4912 assert (status == 0, "invariant");
4913 OrderAccess::fence();
4914 return;
4915 }
4916
4917 #ifdef ASSERT
4918 // Don't catch signals while blocked; let the running threads have the signals.
4919 // (This allows a debugger to break into the running thread.)
4920 sigset_t oldsigs;
4921 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4922 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4923 #endif
4924
4925 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4926 jt->set_suspend_equivalent();
4927 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4928
4929 if (time == 0) {
4930 status = pthread_cond_wait (_cond, _mutex);
4931 } else {
4932 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4933 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4934 pthread_cond_destroy (_cond);
4935 pthread_cond_init (_cond, NULL);
4936 }
4937 }
4938 assert_status(status == 0 || status == EINTR ||
4939 status == ETIME || status == ETIMEDOUT,
4940 status, "cond_timedwait");
4941
4942 #ifdef ASSERT
4943 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4944 #endif
4945
4946 _counter = 0;
4947 status = pthread_mutex_unlock(_mutex);
4948 assert_status(status == 0, status, "invariant");
4949 // If externally suspended while waiting, re-suspend
4950 if (jt->handle_special_suspend_equivalent_condition()) {
4951 jt->java_suspend_self();
4952 }
4953
4954 OrderAccess::fence();
4955 }
4956
4957 void Parker::unpark() {
4958 int s, status;
4959 status = pthread_mutex_lock(_mutex);
4960 assert (status == 0, "invariant");
4961 s = _counter;
4962 _counter = 1;
4963 if (s < 1) {
4964 if (WorkAroundNPTLTimedWaitHang) {
4965 status = pthread_cond_signal (_cond);
4966 assert (status == 0, "invariant");
4967 status = pthread_mutex_unlock(_mutex);
4968 assert (status == 0, "invariant");
4969 } else {
4970 status = pthread_mutex_unlock(_mutex);
4971 assert (status == 0, "invariant");
4972 status = pthread_cond_signal (_cond);
4973 assert (status == 0, "invariant");
4974 }
4975 } else {
4976 pthread_mutex_unlock(_mutex);
4977 assert (status == 0, "invariant");
4978 }
4979 }
4980
4981 extern char** environ;
4982
4983 // Run the specified command in a separate process. Return its exit value,
4984 // or -1 on failure (e.g. can't fork a new process).
4985 // Unlike system(), this function can be called from signal handler. It
4986 // doesn't block SIGINT et al.
4987 int os::fork_and_exec(char* cmd) {
4988 char * argv[4] = {"sh", "-c", cmd, NULL};
4989
4990 pid_t pid = fork();
4991
4992 if (pid < 0) {
4993 // fork failed
4994 return -1;
4995
4996 } else if (pid == 0) {
4997 // child process
4998
4999 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
5000 execve("/usr/bin/sh", argv, environ);
5001
5002 // execve failed
5003 _exit(-1);
5004
5005 } else {
5006 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5007 // care about the actual exit code, for now.
5008
5009 int status;
5010
5011 // Wait for the child process to exit. This returns immediately if
5012 // the child has already exited. */
5013 while (waitpid(pid, &status, 0) < 0) {
5014 switch (errno) {
5015 case ECHILD: return 0;
5016 case EINTR: break;
5017 default: return -1;
5018 }
5019 }
5020
5021 if (WIFEXITED(status)) {
5022 // The child exited normally; get its exit code.
5023 return WEXITSTATUS(status);
5024 } else if (WIFSIGNALED(status)) {
5025 // The child exited because of a signal.
5026 // The best value to return is 0x80 + signal number,
5027 // because that is what all Unix shells do, and because
5028 // it allows callers to distinguish between process exit and
5029 // process death by signal.
5030 return 0x80 + WTERMSIG(status);
5031 } else {
5032 // Unknown exit code; pass it through.
5033 return status;
5034 }
5035 }
5036 return -1;
5037 }
5038
5039 // is_headless_jre()
5040 //
5041 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5042 // in order to report if we are running in a headless jre.
5043 //
5044 // Since JDK8 xawt/libmawt.so is moved into the same directory
5045 // as libawt.so, and renamed libawt_xawt.so
5046 bool os::is_headless_jre() {
5047 struct stat statbuf;
5048 char buf[MAXPATHLEN];
5049 char libmawtpath[MAXPATHLEN];
5050 const char *xawtstr = "/xawt/libmawt.so";
5051 const char *new_xawtstr = "/libawt_xawt.so";
5052
5053 char *p;
5054
5055 // Get path to libjvm.so
5056 os::jvm_path(buf, sizeof(buf));
5057
5058 // Get rid of libjvm.so
5059 p = strrchr(buf, '/');
5060 if (p == NULL) return false;
5061 else *p = '\0';
5062
5063 // Get rid of client or server
5064 p = strrchr(buf, '/');
5065 if (p == NULL) return false;
5066 else *p = '\0';
5067
5068 // check xawt/libmawt.so
5069 strcpy(libmawtpath, buf);
5070 strcat(libmawtpath, xawtstr);
5071 if (::stat(libmawtpath, &statbuf) == 0) return false;
5072
5073 // check libawt_xawt.so
5074 strcpy(libmawtpath, buf);
5075 strcat(libmawtpath, new_xawtstr);
5076 if (::stat(libmawtpath, &statbuf) == 0) return false;
5077
5078 return true;
5079 }
5080
5081 // Get the default path to the core file
5082 // Returns the length of the string
5083 int os::get_core_path(char* buffer, size_t bufferSize) {
5084 const char* p = get_current_directory(buffer, bufferSize);
5085
5086 if (p == NULL) {
5087 assert(p != NULL, "failed to get current directory");
5088 return 0;
5089 }
5090
5091 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
5092 p, current_process_id());
5093
5094 return strlen(buffer);
5095 }
5096
5097 #ifndef PRODUCT
5098 void TestReserveMemorySpecial_test() {
5099 // No tests available for this platform
5100 }
5101 #endif