1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2014 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_aix.h"
39 #include "libperfstat_aix.hpp"
40 #include "loadlib_aix.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/filemap.hpp"
43 #include "mutex_aix.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "os_share_aix.hpp"
46 #include "porting_aix.hpp"
47 #include "prims/jniFastGetField.hpp"
48 #include "prims/jvm.h"
49 #include "prims/jvm_misc.hpp"
50 #include "runtime/arguments.hpp"
51 #include "runtime/extendedPC.hpp"
52 #include "runtime/globals.hpp"
53 #include "runtime/interfaceSupport.hpp"
54 #include "runtime/java.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/mutexLocker.hpp"
57 #include "runtime/objectMonitor.hpp"
58 #include "runtime/orderAccess.inline.hpp"
59 #include "runtime/osThread.hpp"
60 #include "runtime/perfMemory.hpp"
61 #include "runtime/sharedRuntime.hpp"
62 #include "runtime/statSampler.hpp"
63 #include "runtime/stubRoutines.hpp"
64 #include "runtime/thread.inline.hpp"
65 #include "runtime/threadCritical.hpp"
66 #include "runtime/timer.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/runtimeService.hpp"
69 #include "utilities/decoder.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/events.hpp"
72 #include "utilities/growableArray.hpp"
73 #include "utilities/vmError.hpp"
74
75 // put OS-includes here (sorted alphabetically)
76 #include <errno.h>
77 #include <fcntl.h>
78 #include <inttypes.h>
79 #include <poll.h>
80 #include <procinfo.h>
81 #include <pthread.h>
82 #include <pwd.h>
83 #include <semaphore.h>
84 #include <signal.h>
85 #include <stdint.h>
86 #include <stdio.h>
87 #include <string.h>
88 #include <unistd.h>
89 #include <sys/ioctl.h>
90 #include <sys/ipc.h>
91 #include <sys/mman.h>
92 #include <sys/resource.h>
93 #include <sys/select.h>
94 #include <sys/shm.h>
95 #include <sys/socket.h>
96 #include <sys/stat.h>
97 #include <sys/sysinfo.h>
98 #include <sys/systemcfg.h>
99 #include <sys/time.h>
100 #include <sys/times.h>
101 #include <sys/types.h>
102 #include <sys/utsname.h>
103 #include <sys/vminfo.h>
104 #include <sys/wait.h>
105
106 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
107 #if !defined(_AIXVERSION_610)
108 extern "C" {
109 int getthrds64(pid_t ProcessIdentifier,
110 struct thrdentry64* ThreadBuffer,
111 int ThreadSize,
112 tid64_t* IndexPointer,
113 int Count);
114 }
115 #endif
116
117 // Excerpts from systemcfg.h definitions newer than AIX 5.3
118 #ifndef PV_7
119 # define PV_7 0x200000 // Power PC 7
120 # define PV_7_Compat 0x208000 // Power PC 7
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // the semantics in this file are thus that codeptr_t is a *real code ptr*
134 // This means that any function taking codeptr_t as arguments will assume
135 // a real codeptr and won't handle function descriptors (eg getFuncName),
136 // whereas functions taking address as args will deal with function
137 // descriptors (eg os::dll_address_to_library_name)
138 typedef unsigned int* codeptr_t;
139
140 // typedefs for stackslots, stack pointers, pointers to op codes
141 typedef unsigned long stackslot_t;
142 typedef stackslot_t* stackptr_t;
143
144 // query dimensions of the stack of the calling thread
145 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
146
147 // function to check a given stack pointer against given stack limits
148 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
149 if (((uintptr_t)sp) & 0x7) {
150 return false;
151 }
152 if (sp > stack_base) {
153 return false;
154 }
155 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
156 return false;
157 }
158 return true;
159 }
160
161 // returns true if function is a valid codepointer
162 inline bool is_valid_codepointer(codeptr_t p) {
163 if (!p) {
164 return false;
165 }
166 if (((uintptr_t)p) & 0x3) {
167 return false;
168 }
169 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
170 return false;
171 }
172 return true;
173 }
174
175 // macro to check a given stack pointer against given stack limits and to die if test fails
176 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
177 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
178 }
179
180 // macro to check the current stack pointer against given stacklimits
181 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
182 address sp; \
183 sp = os::current_stack_pointer(); \
184 CHECK_STACK_PTR(sp, stack_base, stack_size); \
185 }
186
187 ////////////////////////////////////////////////////////////////////////////////
188 // global variables (for a description see os_aix.hpp)
189
190 julong os::Aix::_physical_memory = 0;
191 pthread_t os::Aix::_main_thread = ((pthread_t)0);
192 int os::Aix::_page_size = -1;
193 int os::Aix::_on_pase = -1;
194 int os::Aix::_os_version = -1;
195 int os::Aix::_stack_page_size = -1;
196 size_t os::Aix::_shm_default_page_size = -1;
197 int os::Aix::_can_use_64K_pages = -1;
198 int os::Aix::_can_use_16M_pages = -1;
199 int os::Aix::_xpg_sus_mode = -1;
200 int os::Aix::_extshm = -1;
201 int os::Aix::_logical_cpus = -1;
202
203 ////////////////////////////////////////////////////////////////////////////////
204 // local variables
205
206 static int g_multipage_error = -1; // error analysis for multipage initialization
207 static jlong initial_time_count = 0;
208 static int clock_tics_per_sec = 100;
209 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
210 static bool check_signals = true;
211 static pid_t _initial_pid = 0;
212 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
213 static sigset_t SR_sigset;
214 static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls */
215
216 julong os::available_memory() {
217 return Aix::available_memory();
218 }
219
220 julong os::Aix::available_memory() {
221 os::Aix::meminfo_t mi;
222 if (os::Aix::get_meminfo(&mi)) {
223 return mi.real_free;
224 } else {
225 return 0xFFFFFFFFFFFFFFFFLL;
226 }
227 }
228
229 julong os::physical_memory() {
230 return Aix::physical_memory();
231 }
232
233 ////////////////////////////////////////////////////////////////////////////////
234 // environment support
235
236 bool os::getenv(const char* name, char* buf, int len) {
237 const char* val = ::getenv(name);
238 if (val != NULL && strlen(val) < (size_t)len) {
239 strcpy(buf, val);
240 return true;
241 }
242 if (len > 0) buf[0] = 0; // return a null string
243 return false;
244 }
245
246
247 // Return true if user is running as root.
248
249 bool os::have_special_privileges() {
250 static bool init = false;
251 static bool privileges = false;
252 if (!init) {
253 privileges = (getuid() != geteuid()) || (getgid() != getegid());
254 init = true;
255 }
256 return privileges;
257 }
258
259 // Helper function, emulates disclaim64 using multiple 32bit disclaims
260 // because we cannot use disclaim64() on AS/400 and old AIX releases.
261 static bool my_disclaim64(char* addr, size_t size) {
262
263 if (size == 0) {
264 return true;
265 }
266
267 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
268 const unsigned int maxDisclaimSize = 0x80000000;
269
270 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
271 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
272
273 char* p = addr;
274
275 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
276 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
277 //if (Verbose)
278 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
279 return false;
280 }
281 p += maxDisclaimSize;
282 }
283
284 if (lastDisclaimSize > 0) {
285 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
286 //if (Verbose)
287 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
288 return false;
289 }
290 }
291
292 return true;
293 }
294
295 // Cpu architecture string
296 #if defined(PPC32)
297 static char cpu_arch[] = "ppc";
298 #elif defined(PPC64)
299 static char cpu_arch[] = "ppc64";
300 #else
301 #error Add appropriate cpu_arch setting
302 #endif
303
304
305 // Given an address, returns the size of the page backing that address.
306 size_t os::Aix::query_pagesize(void* addr) {
307
308 vm_page_info pi;
309 pi.addr = (uint64_t)addr;
310 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
311 return pi.pagesize;
312 } else {
313 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
314 assert(false, "vmgetinfo failed to retrieve page size");
315 return SIZE_4K;
316 }
317
318 }
319
320 // Returns the kernel thread id of the currently running thread.
321 pid_t os::Aix::gettid() {
322 return (pid_t) thread_self();
323 }
324
325 void os::Aix::initialize_system_info() {
326
327 // get the number of online(logical) cpus instead of configured
328 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
329 assert(_processor_count > 0, "_processor_count must be > 0");
330
331 // retrieve total physical storage
332 os::Aix::meminfo_t mi;
333 if (!os::Aix::get_meminfo(&mi)) {
334 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
335 assert(false, "os::Aix::get_meminfo failed.");
336 }
337 _physical_memory = (julong) mi.real_total;
338 }
339
340 // Helper function for tracing page sizes.
341 static const char* describe_pagesize(size_t pagesize) {
342 switch (pagesize) {
343 case SIZE_4K : return "4K";
344 case SIZE_64K: return "64K";
345 case SIZE_16M: return "16M";
346 case SIZE_16G: return "16G";
347 default:
348 assert(false, "surprise");
349 return "??";
350 }
351 }
352
353 // Retrieve information about multipage size support. Will initialize
354 // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages,
355 // Aix::_can_use_16M_pages.
356 // Must be called before calling os::large_page_init().
357 void os::Aix::query_multipage_support() {
358
359 guarantee(_page_size == -1 &&
360 _stack_page_size == -1 &&
361 _can_use_64K_pages == -1 &&
362 _can_use_16M_pages == -1 &&
363 g_multipage_error == -1,
364 "do not call twice");
365
366 _page_size = ::sysconf(_SC_PAGESIZE);
367
368 // This really would surprise me.
369 assert(_page_size == SIZE_4K, "surprise!");
370
371
372 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
373 // Default data page size is influenced either by linker options (-bdatapsize)
374 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
375 // default should be 4K.
376 size_t data_page_size = SIZE_4K;
377 {
378 void* p = ::malloc(SIZE_16M);
379 guarantee(p != NULL, "malloc failed");
380 data_page_size = os::Aix::query_pagesize(p);
381 ::free(p);
382 }
383
384 // query default shm page size (LDR_CNTRL SHMPSIZE)
385 {
386 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
387 guarantee(shmid != -1, "shmget failed");
388 void* p = ::shmat(shmid, NULL, 0);
389 ::shmctl(shmid, IPC_RMID, NULL);
390 guarantee(p != (void*) -1, "shmat failed");
391 _shm_default_page_size = os::Aix::query_pagesize(p);
392 ::shmdt(p);
393 }
394
395 // before querying the stack page size, make sure we are not running as primordial
396 // thread (because primordial thread's stack may have different page size than
397 // pthread thread stacks). Running a VM on the primordial thread won't work for a
398 // number of reasons so we may just as well guarantee it here
399 guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread");
400
401 // query stack page size
402 {
403 int dummy = 0;
404 _stack_page_size = os::Aix::query_pagesize(&dummy);
405 // everything else would surprise me and should be looked into
406 guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size");
407 // also, just for completeness: pthread stacks are allocated from C heap, so
408 // stack page size should be the same as data page size
409 guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size");
410 }
411
412 // EXTSHM is bad: among other things, it prevents setting pagesize dynamically
413 // for system V shm.
414 if (Aix::extshm()) {
415 if (Verbose) {
416 fprintf(stderr, "EXTSHM is active - will disable large page support.\n"
417 "Please make sure EXTSHM is OFF for large page support.\n");
418 }
419 g_multipage_error = ERROR_MP_EXTSHM_ACTIVE;
420 _can_use_64K_pages = _can_use_16M_pages = 0;
421 goto query_multipage_support_end;
422 }
423
424 // now check which page sizes the OS claims it supports, and of those, which actually can be used.
425 {
426 const int MAX_PAGE_SIZES = 4;
427 psize_t sizes[MAX_PAGE_SIZES];
428 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
429 if (num_psizes == -1) {
430 if (Verbose) {
431 fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
432 fprintf(stderr, "disabling multipage support.\n");
433 }
434 g_multipage_error = ERROR_MP_VMGETINFO_FAILED;
435 _can_use_64K_pages = _can_use_16M_pages = 0;
436 goto query_multipage_support_end;
437 }
438 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
439 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
440 if (Verbose) {
441 fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
442 for (int i = 0; i < num_psizes; i ++) {
443 fprintf(stderr, " %s ", describe_pagesize(sizes[i]));
444 }
445 fprintf(stderr, " .\n");
446 }
447
448 // Can we use 64K, 16M pages?
449 _can_use_64K_pages = 0;
450 _can_use_16M_pages = 0;
451 for (int i = 0; i < num_psizes; i ++) {
452 if (sizes[i] == SIZE_64K) {
453 _can_use_64K_pages = 1;
454 } else if (sizes[i] == SIZE_16M) {
455 _can_use_16M_pages = 1;
456 }
457 }
458
459 if (!_can_use_64K_pages) {
460 g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K;
461 }
462
463 // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages,
464 // there must be an actual 16M page pool, and we must run with enough rights.
465 if (_can_use_16M_pages) {
466 const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR);
467 guarantee(shmid != -1, "shmget failed");
468 struct shmid_ds shm_buf = { 0 };
469 shm_buf.shm_pagesize = SIZE_16M;
470 const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false;
471 const int en = errno;
472 ::shmctl(shmid, IPC_RMID, NULL);
473 if (!can_set_pagesize) {
474 if (Verbose) {
475 fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n"
476 "Will deactivate 16M support.\n", en, strerror(en));
477 }
478 _can_use_16M_pages = 0;
479 }
480 }
481
482 } // end: check which pages can be used for shared memory
483
484 query_multipage_support_end:
485
486 guarantee(_page_size != -1 &&
487 _stack_page_size != -1 &&
488 _can_use_64K_pages != -1 &&
489 _can_use_16M_pages != -1, "Page sizes not properly initialized");
490
491 if (_can_use_64K_pages) {
492 g_multipage_error = 0;
493 }
494
495 if (Verbose) {
496 fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size));
497 fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size));
498 fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size));
499 fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no"));
500 fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no"));
501 fprintf(stderr, "Multipage error details: %d\n", g_multipage_error);
502 }
503
504 } // end os::Aix::query_multipage_support()
505
506 // The code for this method was initially derived from the version in os_linux.cpp.
507 void os::init_system_properties_values() {
508
509 #define DEFAULT_LIBPATH "/usr/lib:/lib"
510 #define EXTENSIONS_DIR "/lib/ext"
511 #define ENDORSED_DIR "/lib/endorsed"
512
513 // Buffer that fits several sprintfs.
514 // Note that the space for the trailing null is provided
515 // by the nulls included by the sizeof operator.
516 const size_t bufsize =
517 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
518 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR), // extensions dir
519 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
520 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
521
522 // sysclasspath, java_home, dll_dir
523 {
524 char *pslash;
525 os::jvm_path(buf, bufsize);
526
527 // Found the full path to libjvm.so.
528 // Now cut the path to <java_home>/jre if we can.
529 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
530 pslash = strrchr(buf, '/');
531 if (pslash != NULL) {
532 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
533 }
534 Arguments::set_dll_dir(buf);
535
536 if (pslash != NULL) {
537 pslash = strrchr(buf, '/');
538 if (pslash != NULL) {
539 *pslash = '\0'; // Get rid of /<arch>.
540 pslash = strrchr(buf, '/');
541 if (pslash != NULL) {
542 *pslash = '\0'; // Get rid of /lib.
543 }
544 }
545 }
546 Arguments::set_java_home(buf);
547 set_boot_path('/', ':');
548 }
549
550 // Where to look for native libraries.
551
552 // On Aix we get the user setting of LIBPATH.
553 // Eventually, all the library path setting will be done here.
554 // Get the user setting of LIBPATH.
555 const char *v = ::getenv("LIBPATH");
556 const char *v_colon = ":";
557 if (v == NULL) { v = ""; v_colon = ""; }
558
559 // Concatenate user and invariant part of ld_library_path.
560 // That's +1 for the colon and +1 for the trailing '\0'.
561 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
562 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
563 Arguments::set_library_path(ld_library_path);
564 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal);
565
566 // Extensions directories.
567 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
568 Arguments::set_ext_dirs(buf);
569
570 // Endorsed standards default directory.
571 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
572 Arguments::set_endorsed_dirs(buf);
573
574 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
575
576 #undef DEFAULT_LIBPATH
577 #undef EXTENSIONS_DIR
578 #undef ENDORSED_DIR
579 }
580
581 ////////////////////////////////////////////////////////////////////////////////
582 // breakpoint support
583
584 void os::breakpoint() {
585 BREAKPOINT;
586 }
587
588 extern "C" void breakpoint() {
589 // use debugger to set breakpoint here
590 }
591
592 ////////////////////////////////////////////////////////////////////////////////
593 // signal support
594
595 debug_only(static bool signal_sets_initialized = false);
596 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
597
598 bool os::Aix::is_sig_ignored(int sig) {
599 struct sigaction oact;
600 sigaction(sig, (struct sigaction*)NULL, &oact);
601 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
602 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
603 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
604 return true;
605 else
606 return false;
607 }
608
609 void os::Aix::signal_sets_init() {
610 // Should also have an assertion stating we are still single-threaded.
611 assert(!signal_sets_initialized, "Already initialized");
612 // Fill in signals that are necessarily unblocked for all threads in
613 // the VM. Currently, we unblock the following signals:
614 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
615 // by -Xrs (=ReduceSignalUsage));
616 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
617 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
618 // the dispositions or masks wrt these signals.
619 // Programs embedding the VM that want to use the above signals for their
620 // own purposes must, at this time, use the "-Xrs" option to prevent
621 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
622 // (See bug 4345157, and other related bugs).
623 // In reality, though, unblocking these signals is really a nop, since
624 // these signals are not blocked by default.
625 sigemptyset(&unblocked_sigs);
626 sigemptyset(&allowdebug_blocked_sigs);
627 sigaddset(&unblocked_sigs, SIGILL);
628 sigaddset(&unblocked_sigs, SIGSEGV);
629 sigaddset(&unblocked_sigs, SIGBUS);
630 sigaddset(&unblocked_sigs, SIGFPE);
631 sigaddset(&unblocked_sigs, SIGTRAP);
632 sigaddset(&unblocked_sigs, SIGDANGER);
633 sigaddset(&unblocked_sigs, SR_signum);
634
635 if (!ReduceSignalUsage) {
636 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
637 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
638 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
639 }
640 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
641 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
642 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
643 }
644 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
645 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
646 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
647 }
648 }
649 // Fill in signals that are blocked by all but the VM thread.
650 sigemptyset(&vm_sigs);
651 if (!ReduceSignalUsage)
652 sigaddset(&vm_sigs, BREAK_SIGNAL);
653 debug_only(signal_sets_initialized = true);
654 }
655
656 // These are signals that are unblocked while a thread is running Java.
657 // (For some reason, they get blocked by default.)
658 sigset_t* os::Aix::unblocked_signals() {
659 assert(signal_sets_initialized, "Not initialized");
660 return &unblocked_sigs;
661 }
662
663 // These are the signals that are blocked while a (non-VM) thread is
664 // running Java. Only the VM thread handles these signals.
665 sigset_t* os::Aix::vm_signals() {
666 assert(signal_sets_initialized, "Not initialized");
667 return &vm_sigs;
668 }
669
670 // These are signals that are blocked during cond_wait to allow debugger in
671 sigset_t* os::Aix::allowdebug_blocked_signals() {
672 assert(signal_sets_initialized, "Not initialized");
673 return &allowdebug_blocked_sigs;
674 }
675
676 void os::Aix::hotspot_sigmask(Thread* thread) {
677
678 //Save caller's signal mask before setting VM signal mask
679 sigset_t caller_sigmask;
680 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
681
682 OSThread* osthread = thread->osthread();
683 osthread->set_caller_sigmask(caller_sigmask);
684
685 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
686
687 if (!ReduceSignalUsage) {
688 if (thread->is_VM_thread()) {
689 // Only the VM thread handles BREAK_SIGNAL ...
690 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
691 } else {
692 // ... all other threads block BREAK_SIGNAL
693 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
694 }
695 }
696 }
697
698 // retrieve memory information.
699 // Returns false if something went wrong;
700 // content of pmi undefined in this case.
701 bool os::Aix::get_meminfo(meminfo_t* pmi) {
702
703 assert(pmi, "get_meminfo: invalid parameter");
704
705 memset(pmi, 0, sizeof(meminfo_t));
706
707 if (os::Aix::on_pase()) {
708
709 Unimplemented();
710 return false;
711
712 } else {
713
714 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
715 // See:
716 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
717 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
718 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
719 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
720
721 perfstat_memory_total_t psmt;
722 memset (&psmt, '\0', sizeof(psmt));
723 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
724 if (rc == -1) {
725 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
726 assert(0, "perfstat_memory_total() failed");
727 return false;
728 }
729
730 assert(rc == 1, "perfstat_memory_total() - weird return code");
731
732 // excerpt from
733 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
734 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
735 // The fields of perfstat_memory_total_t:
736 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
737 // u_longlong_t real_total Total real memory (in 4 KB pages).
738 // u_longlong_t real_free Free real memory (in 4 KB pages).
739 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
740 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
741
742 pmi->virt_total = psmt.virt_total * 4096;
743 pmi->real_total = psmt.real_total * 4096;
744 pmi->real_free = psmt.real_free * 4096;
745 pmi->pgsp_total = psmt.pgsp_total * 4096;
746 pmi->pgsp_free = psmt.pgsp_free * 4096;
747
748 return true;
749
750 }
751 } // end os::Aix::get_meminfo
752
753 // Retrieve global cpu information.
754 // Returns false if something went wrong;
755 // the content of pci is undefined in this case.
756 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
757 assert(pci, "get_cpuinfo: invalid parameter");
758 memset(pci, 0, sizeof(cpuinfo_t));
759
760 perfstat_cpu_total_t psct;
761 memset (&psct, '\0', sizeof(psct));
762
763 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
764 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
765 assert(0, "perfstat_cpu_total() failed");
766 return false;
767 }
768
769 // global cpu information
770 strcpy (pci->description, psct.description);
771 pci->processorHZ = psct.processorHZ;
772 pci->ncpus = psct.ncpus;
773 os::Aix::_logical_cpus = psct.ncpus;
774 for (int i = 0; i < 3; i++) {
775 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
776 }
777
778 // get the processor version from _system_configuration
779 switch (_system_configuration.version) {
780 case PV_7:
781 strcpy(pci->version, "Power PC 7");
782 break;
783 case PV_6_1:
784 strcpy(pci->version, "Power PC 6 DD1.x");
785 break;
786 case PV_6:
787 strcpy(pci->version, "Power PC 6");
788 break;
789 case PV_5:
790 strcpy(pci->version, "Power PC 5");
791 break;
792 case PV_5_2:
793 strcpy(pci->version, "Power PC 5_2");
794 break;
795 case PV_5_3:
796 strcpy(pci->version, "Power PC 5_3");
797 break;
798 case PV_5_Compat:
799 strcpy(pci->version, "PV_5_Compat");
800 break;
801 case PV_6_Compat:
802 strcpy(pci->version, "PV_6_Compat");
803 break;
804 case PV_7_Compat:
805 strcpy(pci->version, "PV_7_Compat");
806 break;
807 default:
808 strcpy(pci->version, "unknown");
809 }
810
811 return true;
812
813 } //end os::Aix::get_cpuinfo
814
815 //////////////////////////////////////////////////////////////////////////////
816 // detecting pthread library
817
818 void os::Aix::libpthread_init() {
819 return;
820 }
821
822 //////////////////////////////////////////////////////////////////////////////
823 // create new thread
824
825 // Thread start routine for all newly created threads
826 static void *java_start(Thread *thread) {
827
828 // find out my own stack dimensions
829 {
830 // actually, this should do exactly the same as thread->record_stack_base_and_size...
831 address base = 0;
832 size_t size = 0;
833 query_stack_dimensions(&base, &size);
834 thread->set_stack_base(base);
835 thread->set_stack_size(size);
836 }
837
838 // Do some sanity checks.
839 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
840
841 // Try to randomize the cache line index of hot stack frames.
842 // This helps when threads of the same stack traces evict each other's
843 // cache lines. The threads can be either from the same JVM instance, or
844 // from different JVM instances. The benefit is especially true for
845 // processors with hyperthreading technology.
846
847 static int counter = 0;
848 int pid = os::current_process_id();
849 alloca(((pid ^ counter++) & 7) * 128);
850
851 ThreadLocalStorage::set_thread(thread);
852
853 OSThread* osthread = thread->osthread();
854
855 // thread_id is kernel thread id (similar to Solaris LWP id)
856 osthread->set_thread_id(os::Aix::gettid());
857
858 // initialize signal mask for this thread
859 os::Aix::hotspot_sigmask(thread);
860
861 // initialize floating point control register
862 os::Aix::init_thread_fpu_state();
863
864 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
865
866 // call one more level start routine
867 thread->run();
868
869 return 0;
870 }
871
872 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
873
874 // We want the whole function to be synchronized.
875 ThreadCritical cs;
876
877 assert(thread->osthread() == NULL, "caller responsible");
878
879 // Allocate the OSThread object
880 OSThread* osthread = new OSThread(NULL, NULL);
881 if (osthread == NULL) {
882 return false;
883 }
884
885 // set the correct thread state
886 osthread->set_thread_type(thr_type);
887
888 // Initial state is ALLOCATED but not INITIALIZED
889 osthread->set_state(ALLOCATED);
890
891 thread->set_osthread(osthread);
892
893 // init thread attributes
894 pthread_attr_t attr;
895 pthread_attr_init(&attr);
896 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
897
898 // Make sure we run in 1:1 kernel-user-thread mode.
899 if (os::Aix::on_aix()) {
900 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
901 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
902 } // end: aix
903
904 // Start in suspended state, and in os::thread_start, wake the thread up.
905 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
906
907 // calculate stack size if it's not specified by caller
908 if (os::Aix::supports_variable_stack_size()) {
909 if (stack_size == 0) {
910 stack_size = os::Aix::default_stack_size(thr_type);
911
912 switch (thr_type) {
913 case os::java_thread:
914 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
915 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
916 stack_size = JavaThread::stack_size_at_create();
917 break;
918 case os::compiler_thread:
919 if (CompilerThreadStackSize > 0) {
920 stack_size = (size_t)(CompilerThreadStackSize * K);
921 break;
922 } // else fall through:
923 // use VMThreadStackSize if CompilerThreadStackSize is not defined
924 case os::vm_thread:
925 case os::pgc_thread:
926 case os::cgc_thread:
927 case os::watcher_thread:
928 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
929 break;
930 }
931 }
932
933 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
934 pthread_attr_setstacksize(&attr, stack_size);
935 } //else let thread_create() pick the default value (96 K on AIX)
936
937 pthread_t tid;
938 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
939
940 pthread_attr_destroy(&attr);
941
942 if (ret != 0) {
943 if (PrintMiscellaneous && (Verbose || WizardMode)) {
944 perror("pthread_create()");
945 }
946 // Need to clean up stuff we've allocated so far
947 thread->set_osthread(NULL);
948 delete osthread;
949 return false;
950 }
951
952 // Store pthread info into the OSThread
953 osthread->set_pthread_id(tid);
954
955 return true;
956 }
957
958 /////////////////////////////////////////////////////////////////////////////
959 // attach existing thread
960
961 // bootstrap the main thread
962 bool os::create_main_thread(JavaThread* thread) {
963 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
964 return create_attached_thread(thread);
965 }
966
967 bool os::create_attached_thread(JavaThread* thread) {
968 #ifdef ASSERT
969 thread->verify_not_published();
970 #endif
971
972 // Allocate the OSThread object
973 OSThread* osthread = new OSThread(NULL, NULL);
974
975 if (osthread == NULL) {
976 return false;
977 }
978
979 // Store pthread info into the OSThread
980 osthread->set_thread_id(os::Aix::gettid());
981 osthread->set_pthread_id(::pthread_self());
982
983 // initialize floating point control register
984 os::Aix::init_thread_fpu_state();
985
986 // some sanity checks
987 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
988
989 // Initial thread state is RUNNABLE
990 osthread->set_state(RUNNABLE);
991
992 thread->set_osthread(osthread);
993
994 if (UseNUMA) {
995 int lgrp_id = os::numa_get_group_id();
996 if (lgrp_id != -1) {
997 thread->set_lgrp_id(lgrp_id);
998 }
999 }
1000
1001 // initialize signal mask for this thread
1002 // and save the caller's signal mask
1003 os::Aix::hotspot_sigmask(thread);
1004
1005 return true;
1006 }
1007
1008 void os::pd_start_thread(Thread* thread) {
1009 int status = pthread_continue_np(thread->osthread()->pthread_id());
1010 assert(status == 0, "thr_continue failed");
1011 }
1012
1013 // Free OS resources related to the OSThread
1014 void os::free_thread(OSThread* osthread) {
1015 assert(osthread != NULL, "osthread not set");
1016
1017 if (Thread::current()->osthread() == osthread) {
1018 // Restore caller's signal mask
1019 sigset_t sigmask = osthread->caller_sigmask();
1020 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1021 }
1022
1023 delete osthread;
1024 }
1025
1026 //////////////////////////////////////////////////////////////////////////////
1027 // thread local storage
1028
1029 int os::allocate_thread_local_storage() {
1030 pthread_key_t key;
1031 int rslt = pthread_key_create(&key, NULL);
1032 assert(rslt == 0, "cannot allocate thread local storage");
1033 return (int)key;
1034 }
1035
1036 // Note: This is currently not used by VM, as we don't destroy TLS key
1037 // on VM exit.
1038 void os::free_thread_local_storage(int index) {
1039 int rslt = pthread_key_delete((pthread_key_t)index);
1040 assert(rslt == 0, "invalid index");
1041 }
1042
1043 void os::thread_local_storage_at_put(int index, void* value) {
1044 int rslt = pthread_setspecific((pthread_key_t)index, value);
1045 assert(rslt == 0, "pthread_setspecific failed");
1046 }
1047
1048 extern "C" Thread* get_thread() {
1049 return ThreadLocalStorage::thread();
1050 }
1051
1052 ////////////////////////////////////////////////////////////////////////////////
1053 // time support
1054
1055 // Time since start-up in seconds to a fine granularity.
1056 // Used by VMSelfDestructTimer and the MemProfiler.
1057 double os::elapsedTime() {
1058 return (double)(os::elapsed_counter()) * 0.000001;
1059 }
1060
1061 jlong os::elapsed_counter() {
1062 timeval time;
1063 int status = gettimeofday(&time, NULL);
1064 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1065 }
1066
1067 jlong os::elapsed_frequency() {
1068 return (1000 * 1000);
1069 }
1070
1071 // For now, we say that linux does not support vtime. I have no idea
1072 // whether it can actually be made to (DLD, 9/13/05).
1073
1074 bool os::supports_vtime() { return false; }
1075 bool os::enable_vtime() { return false; }
1076 bool os::vtime_enabled() { return false; }
1077 double os::elapsedVTime() {
1078 // better than nothing, but not much
1079 return elapsedTime();
1080 }
1081
1082 jlong os::javaTimeMillis() {
1083 timeval time;
1084 int status = gettimeofday(&time, NULL);
1085 assert(status != -1, "aix error at gettimeofday()");
1086 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1087 }
1088
1089 // We need to manually declare mread_real_time,
1090 // because IBM didn't provide a prototype in time.h.
1091 // (they probably only ever tested in C, not C++)
1092 extern "C"
1093 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1094
1095 jlong os::javaTimeNanos() {
1096 if (os::Aix::on_pase()) {
1097 Unimplemented();
1098 return 0;
1099 }
1100 else {
1101 // On AIX use the precision of processors real time clock
1102 // or time base registers.
1103 timebasestruct_t time;
1104 int rc;
1105
1106 // If the CPU has a time register, it will be used and
1107 // we have to convert to real time first. After convertion we have following data:
1108 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1109 // time.tb_low [nanoseconds after the last full second above]
1110 // We better use mread_real_time here instead of read_real_time
1111 // to ensure that we will get a monotonic increasing time.
1112 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1113 rc = time_base_to_time(&time, TIMEBASE_SZ);
1114 assert(rc != -1, "aix error at time_base_to_time()");
1115 }
1116 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1117 }
1118 }
1119
1120 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1121 info_ptr->max_value = ALL_64_BITS;
1122 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1123 info_ptr->may_skip_backward = false;
1124 info_ptr->may_skip_forward = false;
1125 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1126 }
1127
1128 // Return the real, user, and system times in seconds from an
1129 // arbitrary fixed point in the past.
1130 bool os::getTimesSecs(double* process_real_time,
1131 double* process_user_time,
1132 double* process_system_time) {
1133 struct tms ticks;
1134 clock_t real_ticks = times(&ticks);
1135
1136 if (real_ticks == (clock_t) (-1)) {
1137 return false;
1138 } else {
1139 double ticks_per_second = (double) clock_tics_per_sec;
1140 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1141 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1142 *process_real_time = ((double) real_ticks) / ticks_per_second;
1143
1144 return true;
1145 }
1146 }
1147
1148
1149 char * os::local_time_string(char *buf, size_t buflen) {
1150 struct tm t;
1151 time_t long_time;
1152 time(&long_time);
1153 localtime_r(&long_time, &t);
1154 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1155 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1156 t.tm_hour, t.tm_min, t.tm_sec);
1157 return buf;
1158 }
1159
1160 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1161 return localtime_r(clock, res);
1162 }
1163
1164 ////////////////////////////////////////////////////////////////////////////////
1165 // runtime exit support
1166
1167 // Note: os::shutdown() might be called very early during initialization, or
1168 // called from signal handler. Before adding something to os::shutdown(), make
1169 // sure it is async-safe and can handle partially initialized VM.
1170 void os::shutdown() {
1171
1172 // allow PerfMemory to attempt cleanup of any persistent resources
1173 perfMemory_exit();
1174
1175 // needs to remove object in file system
1176 AttachListener::abort();
1177
1178 // flush buffered output, finish log files
1179 ostream_abort();
1180
1181 // Check for abort hook
1182 abort_hook_t abort_hook = Arguments::abort_hook();
1183 if (abort_hook != NULL) {
1184 abort_hook();
1185 }
1186
1187 }
1188
1189 // Note: os::abort() might be called very early during initialization, or
1190 // called from signal handler. Before adding something to os::abort(), make
1191 // sure it is async-safe and can handle partially initialized VM.
1192 void os::abort(bool dump_core) {
1193 os::shutdown();
1194 if (dump_core) {
1195 #ifndef PRODUCT
1196 fdStream out(defaultStream::output_fd());
1197 out.print_raw("Current thread is ");
1198 char buf[16];
1199 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1200 out.print_raw_cr(buf);
1201 out.print_raw_cr("Dumping core ...");
1202 #endif
1203 ::abort(); // dump core
1204 }
1205
1206 ::exit(1);
1207 }
1208
1209 // Die immediately, no exit hook, no abort hook, no cleanup.
1210 void os::die() {
1211 ::abort();
1212 }
1213
1214 // Unused on Aix for now.
1215 void os::set_error_file(const char *logfile) {}
1216
1217
1218 // This method is a copy of JDK's sysGetLastErrorString
1219 // from src/solaris/hpi/src/system_md.c
1220
1221 size_t os::lasterror(char *buf, size_t len) {
1222
1223 if (errno == 0) return 0;
1224
1225 const char *s = ::strerror(errno);
1226 size_t n = ::strlen(s);
1227 if (n >= len) {
1228 n = len - 1;
1229 }
1230 ::strncpy(buf, s, n);
1231 buf[n] = '\0';
1232 return n;
1233 }
1234
1235 intx os::current_thread_id() { return (intx)pthread_self(); }
1236 int os::current_process_id() {
1237
1238 // This implementation returns a unique pid, the pid of the
1239 // launcher thread that starts the vm 'process'.
1240
1241 // Under POSIX, getpid() returns the same pid as the
1242 // launcher thread rather than a unique pid per thread.
1243 // Use gettid() if you want the old pre NPTL behaviour.
1244
1245 // if you are looking for the result of a call to getpid() that
1246 // returns a unique pid for the calling thread, then look at the
1247 // OSThread::thread_id() method in osThread_linux.hpp file
1248
1249 return (int)(_initial_pid ? _initial_pid : getpid());
1250 }
1251
1252 // DLL functions
1253
1254 const char* os::dll_file_extension() { return ".so"; }
1255
1256 // This must be hard coded because it's the system's temporary
1257 // directory not the java application's temp directory, ala java.io.tmpdir.
1258 const char* os::get_temp_directory() { return "/tmp"; }
1259
1260 static bool file_exists(const char* filename) {
1261 struct stat statbuf;
1262 if (filename == NULL || strlen(filename) == 0) {
1263 return false;
1264 }
1265 return os::stat(filename, &statbuf) == 0;
1266 }
1267
1268 bool os::dll_build_name(char* buffer, size_t buflen,
1269 const char* pname, const char* fname) {
1270 bool retval = false;
1271 // Copied from libhpi
1272 const size_t pnamelen = pname ? strlen(pname) : 0;
1273
1274 // Return error on buffer overflow.
1275 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1276 *buffer = '\0';
1277 return retval;
1278 }
1279
1280 if (pnamelen == 0) {
1281 snprintf(buffer, buflen, "lib%s.so", fname);
1282 retval = true;
1283 } else if (strchr(pname, *os::path_separator()) != NULL) {
1284 int n;
1285 char** pelements = split_path(pname, &n);
1286 for (int i = 0; i < n; i++) {
1287 // Really shouldn't be NULL, but check can't hurt
1288 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1289 continue; // skip the empty path values
1290 }
1291 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1292 if (file_exists(buffer)) {
1293 retval = true;
1294 break;
1295 }
1296 }
1297 // release the storage
1298 for (int i = 0; i < n; i++) {
1299 if (pelements[i] != NULL) {
1300 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1301 }
1302 }
1303 if (pelements != NULL) {
1304 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1305 }
1306 } else {
1307 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1308 retval = true;
1309 }
1310 return retval;
1311 }
1312
1313 // Check if addr is inside libjvm.so.
1314 bool os::address_is_in_vm(address addr) {
1315
1316 // Input could be a real pc or a function pointer literal. The latter
1317 // would be a function descriptor residing in the data segment of a module.
1318
1319 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1320 if (lib) {
1321 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1322 return true;
1323 } else {
1324 return false;
1325 }
1326 } else {
1327 lib = LoadedLibraries::find_for_data_address(addr);
1328 if (lib) {
1329 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1330 return true;
1331 } else {
1332 return false;
1333 }
1334 } else {
1335 return false;
1336 }
1337 }
1338 }
1339
1340 // Resolve an AIX function descriptor literal to a code pointer.
1341 // If the input is a valid code pointer to a text segment of a loaded module,
1342 // it is returned unchanged.
1343 // If the input is a valid AIX function descriptor, it is resolved to the
1344 // code entry point.
1345 // If the input is neither a valid function descriptor nor a valid code pointer,
1346 // NULL is returned.
1347 static address resolve_function_descriptor_to_code_pointer(address p) {
1348
1349 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1350 if (lib) {
1351 // its a real code pointer
1352 return p;
1353 } else {
1354 lib = LoadedLibraries::find_for_data_address(p);
1355 if (lib) {
1356 // pointer to data segment, potential function descriptor
1357 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1358 if (LoadedLibraries::find_for_text_address(code_entry)) {
1359 // Its a function descriptor
1360 return code_entry;
1361 }
1362 }
1363 }
1364 return NULL;
1365 }
1366
1367 bool os::dll_address_to_function_name(address addr, char *buf,
1368 int buflen, int *offset) {
1369 if (offset) {
1370 *offset = -1;
1371 }
1372 if (buf) {
1373 buf[0] = '\0';
1374 }
1375
1376 // Resolve function ptr literals first.
1377 addr = resolve_function_descriptor_to_code_pointer(addr);
1378 if (!addr) {
1379 return false;
1380 }
1381
1382 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1383 return Decoder::decode(addr, buf, buflen, offset);
1384 }
1385
1386 static int getModuleName(codeptr_t pc, // [in] program counter
1387 char* p_name, size_t namelen, // [out] optional: function name
1388 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1389 ) {
1390
1391 // initialize output parameters
1392 if (p_name && namelen > 0) {
1393 *p_name = '\0';
1394 }
1395 if (p_errmsg && errmsglen > 0) {
1396 *p_errmsg = '\0';
1397 }
1398
1399 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1400 if (lib) {
1401 if (p_name && namelen > 0) {
1402 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1403 }
1404 return 0;
1405 }
1406
1407 if (Verbose) {
1408 fprintf(stderr, "pc outside any module");
1409 }
1410
1411 return -1;
1412
1413 }
1414
1415 bool os::dll_address_to_library_name(address addr, char* buf,
1416 int buflen, int* offset) {
1417 if (offset) {
1418 *offset = -1;
1419 }
1420 if (buf) {
1421 buf[0] = '\0';
1422 }
1423
1424 // Resolve function ptr literals first.
1425 addr = resolve_function_descriptor_to_code_pointer(addr);
1426 if (!addr) {
1427 return false;
1428 }
1429
1430 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1431 return true;
1432 }
1433 return false;
1434 }
1435
1436 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1437 // for the same architecture as Hotspot is running on
1438 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1439
1440 if (ebuf && ebuflen > 0) {
1441 ebuf[0] = '\0';
1442 ebuf[ebuflen - 1] = '\0';
1443 }
1444
1445 if (!filename || strlen(filename) == 0) {
1446 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1447 return NULL;
1448 }
1449
1450 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1451 void * result= ::dlopen(filename, RTLD_LAZY);
1452 if (result != NULL) {
1453 // Reload dll cache. Don't do this in signal handling.
1454 LoadedLibraries::reload();
1455 return result;
1456 } else {
1457 // error analysis when dlopen fails
1458 const char* const error_report = ::dlerror();
1459 if (error_report && ebuf && ebuflen > 0) {
1460 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1461 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1462 }
1463 }
1464 return NULL;
1465 }
1466
1467 // Glibc-2.0 libdl is not MT safe. If you are building with any glibc,
1468 // chances are you might want to run the generated bits against glibc-2.0
1469 // libdl.so, so always use locking for any version of glibc.
1470 void* os::dll_lookup(void* handle, const char* name) {
1471 pthread_mutex_lock(&dl_mutex);
1472 void* res = dlsym(handle, name);
1473 pthread_mutex_unlock(&dl_mutex);
1474 return res;
1475 }
1476
1477 void* os::get_default_process_handle() {
1478 return (void*)::dlopen(NULL, RTLD_LAZY);
1479 }
1480
1481 void os::print_dll_info(outputStream *st) {
1482 st->print_cr("Dynamic libraries:");
1483 LoadedLibraries::print(st);
1484 }
1485
1486 void os::print_os_info(outputStream* st) {
1487 st->print("OS:");
1488
1489 st->print("uname:");
1490 struct utsname name;
1491 uname(&name);
1492 st->print(name.sysname); st->print(" ");
1493 st->print(name.nodename); st->print(" ");
1494 st->print(name.release); st->print(" ");
1495 st->print(name.version); st->print(" ");
1496 st->print(name.machine);
1497 st->cr();
1498
1499 // rlimit
1500 st->print("rlimit:");
1501 struct rlimit rlim;
1502
1503 st->print(" STACK ");
1504 getrlimit(RLIMIT_STACK, &rlim);
1505 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1506 else st->print("%uk", rlim.rlim_cur >> 10);
1507
1508 st->print(", CORE ");
1509 getrlimit(RLIMIT_CORE, &rlim);
1510 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1511 else st->print("%uk", rlim.rlim_cur >> 10);
1512
1513 st->print(", NPROC ");
1514 st->print("%d", sysconf(_SC_CHILD_MAX));
1515
1516 st->print(", NOFILE ");
1517 getrlimit(RLIMIT_NOFILE, &rlim);
1518 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1519 else st->print("%d", rlim.rlim_cur);
1520
1521 st->print(", AS ");
1522 getrlimit(RLIMIT_AS, &rlim);
1523 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1524 else st->print("%uk", rlim.rlim_cur >> 10);
1525
1526 // Print limits on DATA, because it limits the C-heap.
1527 st->print(", DATA ");
1528 getrlimit(RLIMIT_DATA, &rlim);
1529 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1530 else st->print("%uk", rlim.rlim_cur >> 10);
1531 st->cr();
1532
1533 // load average
1534 st->print("load average:");
1535 double loadavg[3] = {-1.L, -1.L, -1.L};
1536 os::loadavg(loadavg, 3);
1537 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1538 st->cr();
1539 }
1540
1541 void os::print_memory_info(outputStream* st) {
1542
1543 st->print_cr("Memory:");
1544
1545 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1546 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1547 st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size()));
1548 st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no"));
1549 st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no"));
1550 if (g_multipage_error != 0) {
1551 st->print_cr(" multipage error: %d", g_multipage_error);
1552 }
1553
1554 // print out LDR_CNTRL because it affects the default page sizes
1555 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1556 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1557
1558 const char* const extshm = ::getenv("EXTSHM");
1559 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1560
1561 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1562 os::Aix::meminfo_t mi;
1563 if (os::Aix::get_meminfo(&mi)) {
1564 char buffer[256];
1565 if (os::Aix::on_aix()) {
1566 jio_snprintf(buffer, sizeof(buffer),
1567 " physical total : %llu\n"
1568 " physical free : %llu\n"
1569 " swap total : %llu\n"
1570 " swap free : %llu\n",
1571 mi.real_total,
1572 mi.real_free,
1573 mi.pgsp_total,
1574 mi.pgsp_free);
1575 } else {
1576 Unimplemented();
1577 }
1578 st->print_raw(buffer);
1579 } else {
1580 st->print_cr(" (no more information available)");
1581 }
1582 }
1583
1584 void os::pd_print_cpu_info(outputStream* st) {
1585 // cpu
1586 st->print("CPU:");
1587 st->print("total %d", os::processor_count());
1588 // It's not safe to query number of active processors after crash
1589 // st->print("(active %d)", os::active_processor_count());
1590 st->print(" %s", VM_Version::cpu_features());
1591 st->cr();
1592 }
1593
1594 void os::print_siginfo(outputStream* st, void* siginfo) {
1595 // Use common posix version.
1596 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1597 st->cr();
1598 }
1599
1600
1601 static void print_signal_handler(outputStream* st, int sig,
1602 char* buf, size_t buflen);
1603
1604 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1605 st->print_cr("Signal Handlers:");
1606 print_signal_handler(st, SIGSEGV, buf, buflen);
1607 print_signal_handler(st, SIGBUS , buf, buflen);
1608 print_signal_handler(st, SIGFPE , buf, buflen);
1609 print_signal_handler(st, SIGPIPE, buf, buflen);
1610 print_signal_handler(st, SIGXFSZ, buf, buflen);
1611 print_signal_handler(st, SIGILL , buf, buflen);
1612 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1613 print_signal_handler(st, SR_signum, buf, buflen);
1614 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1615 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1616 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1617 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1618 print_signal_handler(st, SIGTRAP, buf, buflen);
1619 print_signal_handler(st, SIGDANGER, buf, buflen);
1620 }
1621
1622 static char saved_jvm_path[MAXPATHLEN] = {0};
1623
1624 // Find the full path to the current module, libjvm.so or libjvm_g.so
1625 void os::jvm_path(char *buf, jint buflen) {
1626 // Error checking.
1627 if (buflen < MAXPATHLEN) {
1628 assert(false, "must use a large-enough buffer");
1629 buf[0] = '\0';
1630 return;
1631 }
1632 // Lazy resolve the path to current module.
1633 if (saved_jvm_path[0] != 0) {
1634 strcpy(buf, saved_jvm_path);
1635 return;
1636 }
1637
1638 Dl_info dlinfo;
1639 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1640 assert(ret != 0, "cannot locate libjvm");
1641 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1642 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1643
1644 strcpy(saved_jvm_path, buf);
1645 }
1646
1647 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1648 // no prefix required, not even "_"
1649 }
1650
1651 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1652 // no suffix required
1653 }
1654
1655 ////////////////////////////////////////////////////////////////////////////////
1656 // sun.misc.Signal support
1657
1658 static volatile jint sigint_count = 0;
1659
1660 static void
1661 UserHandler(int sig, void *siginfo, void *context) {
1662 // 4511530 - sem_post is serialized and handled by the manager thread. When
1663 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1664 // don't want to flood the manager thread with sem_post requests.
1665 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1666 return;
1667
1668 // Ctrl-C is pressed during error reporting, likely because the error
1669 // handler fails to abort. Let VM die immediately.
1670 if (sig == SIGINT && is_error_reported()) {
1671 os::die();
1672 }
1673
1674 os::signal_notify(sig);
1675 }
1676
1677 void* os::user_handler() {
1678 return CAST_FROM_FN_PTR(void*, UserHandler);
1679 }
1680
1681 extern "C" {
1682 typedef void (*sa_handler_t)(int);
1683 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1684 }
1685
1686 void* os::signal(int signal_number, void* handler) {
1687 struct sigaction sigAct, oldSigAct;
1688
1689 sigfillset(&(sigAct.sa_mask));
1690
1691 // Do not block out synchronous signals in the signal handler.
1692 // Blocking synchronous signals only makes sense if you can really
1693 // be sure that those signals won't happen during signal handling,
1694 // when the blocking applies. Normal signal handlers are lean and
1695 // do not cause signals. But our signal handlers tend to be "risky"
1696 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1697 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1698 // by a SIGILL, which was blocked due to the signal mask. The process
1699 // just hung forever. Better to crash from a secondary signal than to hang.
1700 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1701 sigdelset(&(sigAct.sa_mask), SIGBUS);
1702 sigdelset(&(sigAct.sa_mask), SIGILL);
1703 sigdelset(&(sigAct.sa_mask), SIGFPE);
1704 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1705
1706 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1707
1708 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1709
1710 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1711 // -1 means registration failed
1712 return (void *)-1;
1713 }
1714
1715 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1716 }
1717
1718 void os::signal_raise(int signal_number) {
1719 ::raise(signal_number);
1720 }
1721
1722 //
1723 // The following code is moved from os.cpp for making this
1724 // code platform specific, which it is by its very nature.
1725 //
1726
1727 // Will be modified when max signal is changed to be dynamic
1728 int os::sigexitnum_pd() {
1729 return NSIG;
1730 }
1731
1732 // a counter for each possible signal value
1733 static volatile jint pending_signals[NSIG+1] = { 0 };
1734
1735 // Linux(POSIX) specific hand shaking semaphore.
1736 static sem_t sig_sem;
1737
1738 void os::signal_init_pd() {
1739 // Initialize signal structures
1740 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1741
1742 // Initialize signal semaphore
1743 int rc = ::sem_init(&sig_sem, 0, 0);
1744 guarantee(rc != -1, "sem_init failed");
1745 }
1746
1747 void os::signal_notify(int sig) {
1748 Atomic::inc(&pending_signals[sig]);
1749 ::sem_post(&sig_sem);
1750 }
1751
1752 static int check_pending_signals(bool wait) {
1753 Atomic::store(0, &sigint_count);
1754 for (;;) {
1755 for (int i = 0; i < NSIG + 1; i++) {
1756 jint n = pending_signals[i];
1757 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1758 return i;
1759 }
1760 }
1761 if (!wait) {
1762 return -1;
1763 }
1764 JavaThread *thread = JavaThread::current();
1765 ThreadBlockInVM tbivm(thread);
1766
1767 bool threadIsSuspended;
1768 do {
1769 thread->set_suspend_equivalent();
1770 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1771
1772 ::sem_wait(&sig_sem);
1773
1774 // were we externally suspended while we were waiting?
1775 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1776 if (threadIsSuspended) {
1777 //
1778 // The semaphore has been incremented, but while we were waiting
1779 // another thread suspended us. We don't want to continue running
1780 // while suspended because that would surprise the thread that
1781 // suspended us.
1782 //
1783 ::sem_post(&sig_sem);
1784
1785 thread->java_suspend_self();
1786 }
1787 } while (threadIsSuspended);
1788 }
1789 }
1790
1791 int os::signal_lookup() {
1792 return check_pending_signals(false);
1793 }
1794
1795 int os::signal_wait() {
1796 return check_pending_signals(true);
1797 }
1798
1799 ////////////////////////////////////////////////////////////////////////////////
1800 // Virtual Memory
1801
1802 // AddrRange describes an immutable address range
1803 //
1804 // This is a helper class for the 'shared memory bookkeeping' below.
1805 class AddrRange {
1806 friend class ShmBkBlock;
1807
1808 char* _start;
1809 size_t _size;
1810
1811 public:
1812
1813 AddrRange(char* start, size_t size)
1814 : _start(start), _size(size)
1815 {}
1816
1817 AddrRange(const AddrRange& r)
1818 : _start(r.start()), _size(r.size())
1819 {}
1820
1821 char* start() const { return _start; }
1822 size_t size() const { return _size; }
1823 char* end() const { return _start + _size; }
1824 bool is_empty() const { return _size == 0 ? true : false; }
1825
1826 static AddrRange empty_range() { return AddrRange(NULL, 0); }
1827
1828 bool contains(const char* p) const {
1829 return start() <= p && end() > p;
1830 }
1831
1832 bool contains(const AddrRange& range) const {
1833 return start() <= range.start() && end() >= range.end();
1834 }
1835
1836 bool intersects(const AddrRange& range) const {
1837 return (range.start() <= start() && range.end() > start()) ||
1838 (range.start() < end() && range.end() >= end()) ||
1839 contains(range);
1840 }
1841
1842 bool is_same_range(const AddrRange& range) const {
1843 return start() == range.start() && size() == range.size();
1844 }
1845
1846 // return the closest inside range consisting of whole pages
1847 AddrRange find_closest_aligned_range(size_t pagesize) const {
1848 if (pagesize == 0 || is_empty()) {
1849 return empty_range();
1850 }
1851 char* const from = (char*)align_size_up((intptr_t)_start, pagesize);
1852 char* const to = (char*)align_size_down((intptr_t)end(), pagesize);
1853 if (from > to) {
1854 return empty_range();
1855 }
1856 return AddrRange(from, to - from);
1857 }
1858 };
1859
1860 ////////////////////////////////////////////////////////////////////////////
1861 // shared memory bookkeeping
1862 //
1863 // the os::reserve_memory() API and friends hand out different kind of memory, depending
1864 // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat.
1865 //
1866 // But these memory types have to be treated differently. For example, to uncommit
1867 // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory,
1868 // disclaim64() is needed.
1869 //
1870 // Therefore we need to keep track of the allocated memory segments and their
1871 // properties.
1872
1873 // ShmBkBlock: base class for all blocks in the shared memory bookkeeping
1874 class ShmBkBlock : public CHeapObj<mtInternal> {
1875
1876 ShmBkBlock* _next;
1877
1878 protected:
1879
1880 AddrRange _range;
1881 const size_t _pagesize;
1882 const bool _pinned;
1883
1884 public:
1885
1886 ShmBkBlock(AddrRange range, size_t pagesize, bool pinned)
1887 : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) {
1888
1889 assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size");
1890 assert(!_range.is_empty(), "invalid range");
1891 }
1892
1893 virtual void print(outputStream* st) const {
1894 st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s",
1895 _range.start(), _range.end(), _range.size(),
1896 _range.size() / _pagesize, describe_pagesize(_pagesize),
1897 _pinned ? "pinned" : "");
1898 }
1899
1900 enum Type { MMAP, SHMAT };
1901 virtual Type getType() = 0;
1902
1903 char* base() const { return _range.start(); }
1904 size_t size() const { return _range.size(); }
1905
1906 void setAddrRange(AddrRange range) {
1907 _range = range;
1908 }
1909
1910 bool containsAddress(const char* p) const {
1911 return _range.contains(p);
1912 }
1913
1914 bool containsRange(const char* p, size_t size) const {
1915 return _range.contains(AddrRange((char*)p, size));
1916 }
1917
1918 bool isSameRange(const char* p, size_t size) const {
1919 return _range.is_same_range(AddrRange((char*)p, size));
1920 }
1921
1922 virtual bool disclaim(char* p, size_t size) = 0;
1923 virtual bool release() = 0;
1924
1925 // blocks live in a list.
1926 ShmBkBlock* next() const { return _next; }
1927 void set_next(ShmBkBlock* blk) { _next = blk; }
1928
1929 }; // end: ShmBkBlock
1930
1931
1932 // ShmBkMappedBlock: describes an block allocated with mmap()
1933 class ShmBkMappedBlock : public ShmBkBlock {
1934 public:
1935
1936 ShmBkMappedBlock(AddrRange range)
1937 : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned
1938
1939 void print(outputStream* st) const {
1940 ShmBkBlock::print(st);
1941 st->print_cr(" - mmap'ed");
1942 }
1943
1944 Type getType() {
1945 return MMAP;
1946 }
1947
1948 bool disclaim(char* p, size_t size) {
1949
1950 AddrRange r(p, size);
1951
1952 guarantee(_range.contains(r), "invalid disclaim");
1953
1954 // only disclaim whole ranges.
1955 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
1956 if (r2.is_empty()) {
1957 return true;
1958 }
1959
1960 const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE);
1961
1962 if (rc != 0) {
1963 warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno);
1964 }
1965
1966 return rc == 0 ? true : false;
1967 }
1968
1969 bool release() {
1970 // mmap'ed blocks are released using munmap
1971 if (::munmap(_range.start(), _range.size()) != 0) {
1972 warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno);
1973 return false;
1974 }
1975 return true;
1976 }
1977 }; // end: ShmBkMappedBlock
1978
1979 // ShmBkShmatedBlock: describes an block allocated with shmget/shmat()
1980 class ShmBkShmatedBlock : public ShmBkBlock {
1981 public:
1982
1983 ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned)
1984 : ShmBkBlock(range, pagesize, pinned) {}
1985
1986 void print(outputStream* st) const {
1987 ShmBkBlock::print(st);
1988 st->print_cr(" - shmat'ed");
1989 }
1990
1991 Type getType() {
1992 return SHMAT;
1993 }
1994
1995 bool disclaim(char* p, size_t size) {
1996
1997 AddrRange r(p, size);
1998
1999 if (_pinned) {
2000 return true;
2001 }
2002
2003 // shmat'ed blocks are disclaimed using disclaim64
2004 guarantee(_range.contains(r), "invalid disclaim");
2005
2006 // only disclaim whole ranges.
2007 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
2008 if (r2.is_empty()) {
2009 return true;
2010 }
2011
2012 const bool rc = my_disclaim64(r2.start(), r2.size());
2013
2014 if (Verbose && !rc) {
2015 warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end());
2016 }
2017
2018 return rc;
2019 }
2020
2021 bool release() {
2022 bool rc = false;
2023 if (::shmdt(_range.start()) != 0) {
2024 warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno);
2025 } else {
2026 rc = true;
2027 }
2028 return rc;
2029 }
2030
2031 }; // end: ShmBkShmatedBlock
2032
2033 static ShmBkBlock* g_shmbk_list = NULL;
2034 static volatile jint g_shmbk_table_lock = 0;
2035
2036 // keep some usage statistics
2037 static struct {
2038 int nodes; // number of nodes in list
2039 size_t bytes; // reserved - not committed - bytes.
2040 int reserves; // how often reserve was called
2041 int lookups; // how often a lookup was made
2042 } g_shmbk_stats = { 0, 0, 0, 0 };
2043
2044 // add information about a shared memory segment to the bookkeeping
2045 static void shmbk_register(ShmBkBlock* p_block) {
2046 guarantee(p_block, "logic error");
2047 p_block->set_next(g_shmbk_list);
2048 g_shmbk_list = p_block;
2049 g_shmbk_stats.reserves ++;
2050 g_shmbk_stats.bytes += p_block->size();
2051 g_shmbk_stats.nodes ++;
2052 }
2053
2054 // remove information about a shared memory segment by its starting address
2055 static void shmbk_unregister(ShmBkBlock* p_block) {
2056 ShmBkBlock* p = g_shmbk_list;
2057 ShmBkBlock* prev = NULL;
2058 while (p) {
2059 if (p == p_block) {
2060 if (prev) {
2061 prev->set_next(p->next());
2062 } else {
2063 g_shmbk_list = p->next();
2064 }
2065 g_shmbk_stats.nodes --;
2066 g_shmbk_stats.bytes -= p->size();
2067 return;
2068 }
2069 prev = p;
2070 p = p->next();
2071 }
2072 assert(false, "should not happen");
2073 }
2074
2075 // given a pointer, return shared memory bookkeeping record for the segment it points into
2076 // using the returned block info must happen under lock protection
2077 static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) {
2078 g_shmbk_stats.lookups ++;
2079 ShmBkBlock* p = g_shmbk_list;
2080 while (p) {
2081 if (p->containsAddress(addr)) {
2082 return p;
2083 }
2084 p = p->next();
2085 }
2086 return NULL;
2087 }
2088
2089 // dump all information about all memory segments allocated with os::reserve_memory()
2090 void shmbk_dump_info() {
2091 tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, "
2092 "total reserves: %d total lookups: %d)",
2093 g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups);
2094 const ShmBkBlock* p = g_shmbk_list;
2095 int i = 0;
2096 while (p) {
2097 p->print(tty);
2098 p = p->next();
2099 i ++;
2100 }
2101 }
2102
2103 #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK;
2104 #define UNLOCK_SHMBK }
2105
2106 // End: shared memory bookkeeping
2107 ////////////////////////////////////////////////////////////////////////////////////////////////////
2108
2109 int os::vm_page_size() {
2110 // Seems redundant as all get out
2111 assert(os::Aix::page_size() != -1, "must call os::init");
2112 return os::Aix::page_size();
2113 }
2114
2115 // Aix allocates memory by pages.
2116 int os::vm_allocation_granularity() {
2117 assert(os::Aix::page_size() != -1, "must call os::init");
2118 return os::Aix::page_size();
2119 }
2120
2121 int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) {
2122
2123 // Commit is a noop. There is no explicit commit
2124 // needed on AIX. Memory is committed when touched.
2125 //
2126 // Debug : check address range for validity
2127 #ifdef ASSERT
2128 LOCK_SHMBK
2129 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2130 if (!block) {
2131 fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr);
2132 shmbk_dump_info();
2133 assert(false, "invalid pointer");
2134 return false;
2135 } else if (!block->containsRange(addr, size)) {
2136 fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size);
2137 shmbk_dump_info();
2138 assert(false, "invalid range");
2139 return false;
2140 }
2141 UNLOCK_SHMBK
2142 #endif // ASSERT
2143
2144 return 0;
2145 }
2146
2147 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2148 return os::Aix::commit_memory_impl(addr, size, exec) == 0;
2149 }
2150
2151 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2152 const char* mesg) {
2153 assert(mesg != NULL, "mesg must be specified");
2154 os::Aix::commit_memory_impl(addr, size, exec);
2155 }
2156
2157 int os::Aix::commit_memory_impl(char* addr, size_t size,
2158 size_t alignment_hint, bool exec) {
2159 return os::Aix::commit_memory_impl(addr, size, exec);
2160 }
2161
2162 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2163 bool exec) {
2164 return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0;
2165 }
2166
2167 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2168 size_t alignment_hint, bool exec,
2169 const char* mesg) {
2170 os::Aix::commit_memory_impl(addr, size, alignment_hint, exec);
2171 }
2172
2173 bool os::pd_uncommit_memory(char* addr, size_t size) {
2174
2175 // Delegate to ShmBkBlock class which knows how to uncommit its memory.
2176
2177 bool rc = false;
2178 LOCK_SHMBK
2179 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2180 if (!block) {
2181 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2182 shmbk_dump_info();
2183 assert(false, "invalid pointer");
2184 return false;
2185 } else if (!block->containsRange(addr, size)) {
2186 fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size);
2187 shmbk_dump_info();
2188 assert(false, "invalid range");
2189 return false;
2190 }
2191 rc = block->disclaim(addr, size);
2192 UNLOCK_SHMBK
2193
2194 if (Verbose && !rc) {
2195 warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size);
2196 }
2197 return rc;
2198 }
2199
2200 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2201 return os::guard_memory(addr, size);
2202 }
2203
2204 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2205 return os::unguard_memory(addr, size);
2206 }
2207
2208 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2209 }
2210
2211 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2212 }
2213
2214 void os::numa_make_global(char *addr, size_t bytes) {
2215 }
2216
2217 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2218 }
2219
2220 bool os::numa_topology_changed() {
2221 return false;
2222 }
2223
2224 size_t os::numa_get_groups_num() {
2225 return 1;
2226 }
2227
2228 int os::numa_get_group_id() {
2229 return 0;
2230 }
2231
2232 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2233 if (size > 0) {
2234 ids[0] = 0;
2235 return 1;
2236 }
2237 return 0;
2238 }
2239
2240 bool os::get_page_info(char *start, page_info* info) {
2241 return false;
2242 }
2243
2244 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2245 return end;
2246 }
2247
2248 // Flags for reserve_shmatted_memory:
2249 #define RESSHM_WISHADDR_OR_FAIL 1
2250 #define RESSHM_TRY_16M_PAGES 2
2251 #define RESSHM_16M_PAGES_OR_FAIL 4
2252
2253 // Result of reserve_shmatted_memory:
2254 struct shmatted_memory_info_t {
2255 char* addr;
2256 size_t pagesize;
2257 bool pinned;
2258 };
2259
2260 // Reserve a section of shmatted memory.
2261 // params:
2262 // bytes [in]: size of memory, in bytes
2263 // requested_addr [in]: wish address.
2264 // NULL = no wish.
2265 // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot
2266 // be obtained, function will fail. Otherwise wish address is treated as hint and
2267 // another pointer is returned.
2268 // flags [in]: some flags. Valid flags are:
2269 // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained.
2270 // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool
2271 // (requires UseLargePages and Use16MPages)
2272 // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail.
2273 // Otherwise any other page size will do.
2274 // p_info [out] : holds information about the created shared memory segment.
2275 static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) {
2276
2277 assert(p_info, "parameter error");
2278
2279 // init output struct.
2280 p_info->addr = NULL;
2281
2282 // neither should we be here for EXTSHM=ON.
2283 if (os::Aix::extshm()) {
2284 ShouldNotReachHere();
2285 }
2286
2287 // extract flags. sanity checks.
2288 const bool wishaddr_or_fail =
2289 flags & RESSHM_WISHADDR_OR_FAIL;
2290 const bool try_16M_pages =
2291 flags & RESSHM_TRY_16M_PAGES;
2292 const bool f16M_pages_or_fail =
2293 flags & RESSHM_16M_PAGES_OR_FAIL;
2294
2295 // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary,
2296 // shmat will fail anyway, so save some cycles by failing right away
2297 if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) {
2298 if (wishaddr_or_fail) {
2299 return false;
2300 } else {
2301 requested_addr = NULL;
2302 }
2303 }
2304
2305 char* addr = NULL;
2306
2307 // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change
2308 // pagesize dynamically.
2309 const size_t size = align_size_up(bytes, SIZE_16M);
2310
2311 // reserve the shared segment
2312 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2313 if (shmid == -1) {
2314 warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno);
2315 return false;
2316 }
2317
2318 // Important note:
2319 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2320 // We must right after attaching it remove it from the system. System V shm segments are global and
2321 // survive the process.
2322 // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm".
2323
2324 // try forcing the page size
2325 size_t pagesize = -1; // unknown so far
2326
2327 if (UseLargePages) {
2328
2329 struct shmid_ds shmbuf;
2330 memset(&shmbuf, 0, sizeof(shmbuf));
2331
2332 // First, try to take from 16M page pool if...
2333 if (os::Aix::can_use_16M_pages() // we can ...
2334 && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages)..
2335 && try_16M_pages) { // caller wants us to.
2336 shmbuf.shm_pagesize = SIZE_16M;
2337 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2338 pagesize = SIZE_16M;
2339 } else {
2340 warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)",
2341 size / SIZE_16M, errno);
2342 if (f16M_pages_or_fail) {
2343 goto cleanup_shm;
2344 }
2345 }
2346 }
2347
2348 // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might,
2349 // because the 64K page pool may also be exhausted.
2350 if (pagesize == -1) {
2351 shmbuf.shm_pagesize = SIZE_64K;
2352 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2353 pagesize = SIZE_64K;
2354 } else {
2355 warning("Failed to allocate %d 64K pages. (shmctl failed with %d)",
2356 size / SIZE_64K, errno);
2357 // here I give up. leave page_size -1 - later, after attaching, we will query the
2358 // real page size of the attached memory. (in theory, it may be something different
2359 // from 4K if LDR_CNTRL SHM_PSIZE is set)
2360 }
2361 }
2362 }
2363
2364 // sanity point
2365 assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size");
2366
2367 // Now attach the shared segment.
2368 addr = (char*) shmat(shmid, requested_addr, 0);
2369 if (addr == (char*)-1) {
2370 // How to handle attach failure:
2371 // If it failed for a specific wish address, tolerate this: in that case, if wish address was
2372 // mandatory, fail, if not, retry anywhere.
2373 // If it failed for any other reason, treat that as fatal error.
2374 addr = NULL;
2375 if (requested_addr) {
2376 if (wishaddr_or_fail) {
2377 goto cleanup_shm;
2378 } else {
2379 addr = (char*) shmat(shmid, NULL, 0);
2380 if (addr == (char*)-1) { // fatal
2381 addr = NULL;
2382 warning("shmat failed (errno: %d)", errno);
2383 goto cleanup_shm;
2384 }
2385 }
2386 } else { // fatal
2387 addr = NULL;
2388 warning("shmat failed (errno: %d)", errno);
2389 goto cleanup_shm;
2390 }
2391 }
2392
2393 // sanity point
2394 assert(addr && addr != (char*) -1, "wrong address");
2395
2396 // after successful Attach remove the segment - right away.
2397 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2398 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2399 guarantee(false, "failed to remove shared memory segment!");
2400 }
2401 shmid = -1;
2402
2403 // query the real page size. In case setting the page size did not work (see above), the system
2404 // may have given us something other then 4K (LDR_CNTRL)
2405 {
2406 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2407 if (pagesize != -1) {
2408 assert(pagesize == real_pagesize, "unexpected pagesize after shmat");
2409 } else {
2410 pagesize = real_pagesize;
2411 }
2412 }
2413
2414 // Now register the reserved block with internal book keeping.
2415 LOCK_SHMBK
2416 const bool pinned = pagesize >= SIZE_16M ? true : false;
2417 ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned);
2418 assert(p_block, "");
2419 shmbk_register(p_block);
2420 UNLOCK_SHMBK
2421
2422 cleanup_shm:
2423
2424 // if we have not done so yet, remove the shared memory segment. This is very important.
2425 if (shmid != -1) {
2426 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2427 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2428 guarantee(false, "failed to remove shared memory segment!");
2429 }
2430 shmid = -1;
2431 }
2432
2433 // trace
2434 if (Verbose && !addr) {
2435 if (requested_addr != NULL) {
2436 warning("failed to shm-allocate 0x%llX bytes at wish address 0x%p.", size, requested_addr);
2437 } else {
2438 warning("failed to shm-allocate 0x%llX bytes at any address.", size);
2439 }
2440 }
2441
2442 // hand info to caller
2443 if (addr) {
2444 p_info->addr = addr;
2445 p_info->pagesize = pagesize;
2446 p_info->pinned = pagesize == SIZE_16M ? true : false;
2447 }
2448
2449 // sanity test:
2450 if (requested_addr && addr && wishaddr_or_fail) {
2451 guarantee(addr == requested_addr, "shmat error");
2452 }
2453
2454 // just one more test to really make sure we have no dangling shm segments.
2455 guarantee(shmid == -1, "dangling shm segments");
2456
2457 return addr ? true : false;
2458
2459 } // end: reserve_shmatted_memory
2460
2461 // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory():
2462 // will return NULL in case of an error.
2463 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) {
2464
2465 // if a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2466 if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) {
2467 warning("Wish address 0x%p not aligned to page boundary.", requested_addr);
2468 return NULL;
2469 }
2470
2471 const size_t size = align_size_up(bytes, SIZE_4K);
2472
2473 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2474 // msync(MS_INVALIDATE) (see os::uncommit_memory)
2475 int flags = MAP_ANONYMOUS | MAP_SHARED;
2476
2477 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2478 // it means if wishaddress is given but MAP_FIXED is not set.
2479 //
2480 // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED
2481 // clobbers the address range, which is probably not what the caller wants. That's
2482 // why I assert here (again) that the SPEC1170 compat mode is off.
2483 // If we want to be able to run under SPEC1170, we have to do some porting and
2484 // testing.
2485 if (requested_addr != NULL) {
2486 assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed.");
2487 flags |= MAP_FIXED;
2488 }
2489
2490 char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2491
2492 if (addr == MAP_FAILED) {
2493 // attach failed: tolerate for specific wish addresses. Not being able to attach
2494 // anywhere is a fatal error.
2495 if (requested_addr == NULL) {
2496 // It's ok to fail here if the machine has not enough memory.
2497 warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno);
2498 }
2499 addr = NULL;
2500 goto cleanup_mmap;
2501 }
2502
2503 // If we did request a specific address and that address was not available, fail.
2504 if (addr && requested_addr) {
2505 guarantee(addr == requested_addr, "unexpected");
2506 }
2507
2508 // register this mmap'ed segment with book keeping
2509 LOCK_SHMBK
2510 ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size));
2511 assert(p_block, "");
2512 shmbk_register(p_block);
2513 UNLOCK_SHMBK
2514
2515 cleanup_mmap:
2516
2517 // trace
2518 if (Verbose) {
2519 if (addr) {
2520 fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes);
2521 }
2522 else {
2523 if (requested_addr != NULL) {
2524 warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr);
2525 } else {
2526 warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes);
2527 }
2528 }
2529 }
2530
2531 return addr;
2532
2533 } // end: reserve_mmaped_memory
2534
2535 // Reserves and attaches a shared memory segment.
2536 // Will assert if a wish address is given and could not be obtained.
2537 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2538 return os::attempt_reserve_memory_at(bytes, requested_addr);
2539 }
2540
2541 bool os::pd_release_memory(char* addr, size_t size) {
2542
2543 // delegate to ShmBkBlock class which knows how to uncommit its memory.
2544
2545 bool rc = false;
2546 LOCK_SHMBK
2547 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2548 if (!block) {
2549 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2550 shmbk_dump_info();
2551 assert(false, "invalid pointer");
2552 return false;
2553 }
2554 else if (!block->isSameRange(addr, size)) {
2555 if (block->getType() == ShmBkBlock::MMAP) {
2556 // Release only the same range or a the beginning or the end of a range.
2557 if (block->base() == addr && size < block->size()) {
2558 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size));
2559 assert(b, "");
2560 shmbk_register(b);
2561 block->setAddrRange(AddrRange(addr, size));
2562 }
2563 else if (addr > block->base() && addr + size == block->base() + block->size()) {
2564 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size));
2565 assert(b, "");
2566 shmbk_register(b);
2567 block->setAddrRange(AddrRange(addr, size));
2568 }
2569 else {
2570 fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size);
2571 shmbk_dump_info();
2572 assert(false, "invalid mmap range");
2573 return false;
2574 }
2575 }
2576 else {
2577 // Release only the same range. No partial release allowed.
2578 // Soften the requirement a bit, because the user may think he owns a smaller size
2579 // than the block is due to alignment etc.
2580 if (block->base() != addr || block->size() < size) {
2581 fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size);
2582 shmbk_dump_info();
2583 assert(false, "invalid shmget range");
2584 return false;
2585 }
2586 }
2587 }
2588 rc = block->release();
2589 assert(rc, "release failed");
2590 // remove block from bookkeeping
2591 shmbk_unregister(block);
2592 delete block;
2593 UNLOCK_SHMBK
2594
2595 if (!rc) {
2596 warning("failed to released %lu bytes at 0x%p", size, addr);
2597 }
2598
2599 return rc;
2600 }
2601
2602 static bool checked_mprotect(char* addr, size_t size, int prot) {
2603
2604 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2605 // not tell me if protection failed when trying to protect an un-protectable range.
2606 //
2607 // This means if the memory was allocated using shmget/shmat, protection wont work
2608 // but mprotect will still return 0:
2609 //
2610 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2611
2612 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2613
2614 if (!rc) {
2615 const char* const s_errno = strerror(errno);
2616 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2617 return false;
2618 }
2619
2620 // mprotect success check
2621 //
2622 // Mprotect said it changed the protection but can I believe it?
2623 //
2624 // To be sure I need to check the protection afterwards. Try to
2625 // read from protected memory and check whether that causes a segfault.
2626 //
2627 if (!os::Aix::xpg_sus_mode()) {
2628
2629 if (StubRoutines::SafeFetch32_stub()) {
2630
2631 const bool read_protected =
2632 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2633 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2634
2635 if (prot & PROT_READ) {
2636 rc = !read_protected;
2637 } else {
2638 rc = read_protected;
2639 }
2640 }
2641 }
2642 if (!rc) {
2643 assert(false, "mprotect failed.");
2644 }
2645 return rc;
2646 }
2647
2648 // Set protections specified
2649 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2650 unsigned int p = 0;
2651 switch (prot) {
2652 case MEM_PROT_NONE: p = PROT_NONE; break;
2653 case MEM_PROT_READ: p = PROT_READ; break;
2654 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2655 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2656 default:
2657 ShouldNotReachHere();
2658 }
2659 // is_committed is unused.
2660 return checked_mprotect(addr, size, p);
2661 }
2662
2663 bool os::guard_memory(char* addr, size_t size) {
2664 return checked_mprotect(addr, size, PROT_NONE);
2665 }
2666
2667 bool os::unguard_memory(char* addr, size_t size) {
2668 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2669 }
2670
2671 // Large page support
2672
2673 static size_t _large_page_size = 0;
2674
2675 // Enable large page support if OS allows that.
2676 void os::large_page_init() {
2677
2678 // Note: os::Aix::query_multipage_support must run first.
2679
2680 if (!UseLargePages) {
2681 return;
2682 }
2683
2684 if (!Aix::can_use_64K_pages()) {
2685 assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M.");
2686 UseLargePages = false;
2687 return;
2688 }
2689
2690 if (!Aix::can_use_16M_pages() && Use16MPages) {
2691 fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool "
2692 " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n");
2693 }
2694
2695 // Do not report 16M page alignment as part of os::_page_sizes if we are
2696 // explicitly forbidden from using 16M pages. Doing so would increase the
2697 // alignment the garbage collector calculates with, slightly increasing
2698 // heap usage. We should only pay for 16M alignment if we really want to
2699 // use 16M pages.
2700 if (Use16MPages && Aix::can_use_16M_pages()) {
2701 _large_page_size = SIZE_16M;
2702 _page_sizes[0] = SIZE_16M;
2703 _page_sizes[1] = SIZE_64K;
2704 _page_sizes[2] = SIZE_4K;
2705 _page_sizes[3] = 0;
2706 } else if (Aix::can_use_64K_pages()) {
2707 _large_page_size = SIZE_64K;
2708 _page_sizes[0] = SIZE_64K;
2709 _page_sizes[1] = SIZE_4K;
2710 _page_sizes[2] = 0;
2711 }
2712
2713 if (Verbose) {
2714 ("Default large page size is 0x%llX.", _large_page_size);
2715 }
2716 } // end: os::large_page_init()
2717
2718 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2719 // "exec" is passed in but not used. Creating the shared image for
2720 // the code cache doesn't have an SHM_X executable permission to check.
2721 Unimplemented();
2722 return 0;
2723 }
2724
2725 bool os::release_memory_special(char* base, size_t bytes) {
2726 // detaching the SHM segment will also delete it, see reserve_memory_special()
2727 Unimplemented();
2728 return false;
2729 }
2730
2731 size_t os::large_page_size() {
2732 return _large_page_size;
2733 }
2734
2735 bool os::can_commit_large_page_memory() {
2736 // Well, sadly we cannot commit anything at all (see comment in
2737 // os::commit_memory) but we claim to so we can make use of large pages
2738 return true;
2739 }
2740
2741 bool os::can_execute_large_page_memory() {
2742 // We can do that
2743 return true;
2744 }
2745
2746 // Reserve memory at an arbitrary address, only if that area is
2747 // available (and not reserved for something else).
2748 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2749
2750 bool use_mmap = false;
2751
2752 // mmap: smaller graining, no large page support
2753 // shm: large graining (256M), large page support, limited number of shm segments
2754 //
2755 // Prefer mmap wherever we either do not need large page support or have OS limits
2756
2757 if (!UseLargePages || bytes < SIZE_16M) {
2758 use_mmap = true;
2759 }
2760
2761 char* addr = NULL;
2762 if (use_mmap) {
2763 addr = reserve_mmaped_memory(bytes, requested_addr);
2764 } else {
2765 // shmat: wish address is mandatory, and do not try 16M pages here.
2766 shmatted_memory_info_t info;
2767 const int flags = RESSHM_WISHADDR_OR_FAIL;
2768 if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) {
2769 addr = info.addr;
2770 }
2771 }
2772
2773 return addr;
2774 }
2775
2776 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2777 return ::read(fd, buf, nBytes);
2778 }
2779
2780 void os::naked_short_sleep(jlong ms) {
2781 struct timespec req;
2782
2783 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2784 req.tv_sec = 0;
2785 if (ms > 0) {
2786 req.tv_nsec = (ms % 1000) * 1000000;
2787 }
2788 else {
2789 req.tv_nsec = 1;
2790 }
2791
2792 nanosleep(&req, NULL);
2793
2794 return;
2795 }
2796
2797 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2798 void os::infinite_sleep() {
2799 while (true) { // sleep forever ...
2800 ::sleep(100); // ... 100 seconds at a time
2801 }
2802 }
2803
2804 // Used to convert frequent JVM_Yield() to nops
2805 bool os::dont_yield() {
2806 return DontYieldALot;
2807 }
2808
2809 void os::yield() {
2810 sched_yield();
2811 }
2812
2813 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN; }
2814
2815 void os::yield_all() {
2816 // Yields to all threads, including threads with lower priorities
2817 // Threads on Linux are all with same priority. The Solaris style
2818 // os::yield_all() with nanosleep(1ms) is not necessary.
2819 sched_yield();
2820 }
2821
2822 ////////////////////////////////////////////////////////////////////////////////
2823 // thread priority support
2824
2825 // From AIX manpage to pthread_setschedparam
2826 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2827 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2828 //
2829 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2830 // range from 40 to 80, where 40 is the least favored priority and 80
2831 // is the most favored."
2832 //
2833 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2834 // scheduling there; however, this still leaves iSeries.)
2835 //
2836 // We use the same values for AIX and PASE.
2837 int os::java_to_os_priority[CriticalPriority + 1] = {
2838 54, // 0 Entry should never be used
2839
2840 55, // 1 MinPriority
2841 55, // 2
2842 56, // 3
2843
2844 56, // 4
2845 57, // 5 NormPriority
2846 57, // 6
2847
2848 58, // 7
2849 58, // 8
2850 59, // 9 NearMaxPriority
2851
2852 60, // 10 MaxPriority
2853
2854 60 // 11 CriticalPriority
2855 };
2856
2857 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2858 if (!UseThreadPriorities) return OS_OK;
2859 pthread_t thr = thread->osthread()->pthread_id();
2860 int policy = SCHED_OTHER;
2861 struct sched_param param;
2862 param.sched_priority = newpri;
2863 int ret = pthread_setschedparam(thr, policy, ¶m);
2864
2865 if (Verbose) {
2866 if (ret == 0) {
2867 fprintf(stderr, "changed priority of thread %d to %d\n", (int)thr, newpri);
2868 } else {
2869 fprintf(stderr, "Could not changed priority for thread %d to %d (error %d, %s)\n",
2870 (int)thr, newpri, ret, strerror(ret));
2871 }
2872 }
2873 return (ret == 0) ? OS_OK : OS_ERR;
2874 }
2875
2876 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2877 if (!UseThreadPriorities) {
2878 *priority_ptr = java_to_os_priority[NormPriority];
2879 return OS_OK;
2880 }
2881 pthread_t thr = thread->osthread()->pthread_id();
2882 int policy = SCHED_OTHER;
2883 struct sched_param param;
2884 int ret = pthread_getschedparam(thr, &policy, ¶m);
2885 *priority_ptr = param.sched_priority;
2886
2887 return (ret == 0) ? OS_OK : OS_ERR;
2888 }
2889
2890 // Hint to the underlying OS that a task switch would not be good.
2891 // Void return because it's a hint and can fail.
2892 void os::hint_no_preempt() {}
2893
2894 ////////////////////////////////////////////////////////////////////////////////
2895 // suspend/resume support
2896
2897 // the low-level signal-based suspend/resume support is a remnant from the
2898 // old VM-suspension that used to be for java-suspension, safepoints etc,
2899 // within hotspot. Now there is a single use-case for this:
2900 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2901 // that runs in the watcher thread.
2902 // The remaining code is greatly simplified from the more general suspension
2903 // code that used to be used.
2904 //
2905 // The protocol is quite simple:
2906 // - suspend:
2907 // - sends a signal to the target thread
2908 // - polls the suspend state of the osthread using a yield loop
2909 // - target thread signal handler (SR_handler) sets suspend state
2910 // and blocks in sigsuspend until continued
2911 // - resume:
2912 // - sets target osthread state to continue
2913 // - sends signal to end the sigsuspend loop in the SR_handler
2914 //
2915 // Note that the SR_lock plays no role in this suspend/resume protocol.
2916 //
2917
2918 static void resume_clear_context(OSThread *osthread) {
2919 osthread->set_ucontext(NULL);
2920 osthread->set_siginfo(NULL);
2921 }
2922
2923 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2924 osthread->set_ucontext(context);
2925 osthread->set_siginfo(siginfo);
2926 }
2927
2928 //
2929 // Handler function invoked when a thread's execution is suspended or
2930 // resumed. We have to be careful that only async-safe functions are
2931 // called here (Note: most pthread functions are not async safe and
2932 // should be avoided.)
2933 //
2934 // Note: sigwait() is a more natural fit than sigsuspend() from an
2935 // interface point of view, but sigwait() prevents the signal hander
2936 // from being run. libpthread would get very confused by not having
2937 // its signal handlers run and prevents sigwait()'s use with the
2938 // mutex granting granting signal.
2939 //
2940 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2941 //
2942 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2943 // Save and restore errno to avoid confusing native code with EINTR
2944 // after sigsuspend.
2945 int old_errno = errno;
2946
2947 Thread* thread = Thread::current();
2948 OSThread* osthread = thread->osthread();
2949 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2950
2951 os::SuspendResume::State current = osthread->sr.state();
2952 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2953 suspend_save_context(osthread, siginfo, context);
2954
2955 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2956 os::SuspendResume::State state = osthread->sr.suspended();
2957 if (state == os::SuspendResume::SR_SUSPENDED) {
2958 sigset_t suspend_set; // signals for sigsuspend()
2959
2960 // get current set of blocked signals and unblock resume signal
2961 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2962 sigdelset(&suspend_set, SR_signum);
2963
2964 // wait here until we are resumed
2965 while (1) {
2966 sigsuspend(&suspend_set);
2967
2968 os::SuspendResume::State result = osthread->sr.running();
2969 if (result == os::SuspendResume::SR_RUNNING) {
2970 break;
2971 }
2972 }
2973
2974 } else if (state == os::SuspendResume::SR_RUNNING) {
2975 // request was cancelled, continue
2976 } else {
2977 ShouldNotReachHere();
2978 }
2979
2980 resume_clear_context(osthread);
2981 } else if (current == os::SuspendResume::SR_RUNNING) {
2982 // request was cancelled, continue
2983 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2984 // ignore
2985 } else {
2986 ShouldNotReachHere();
2987 }
2988
2989 errno = old_errno;
2990 }
2991
2992
2993 static int SR_initialize() {
2994 struct sigaction act;
2995 char *s;
2996 // Get signal number to use for suspend/resume
2997 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2998 int sig = ::strtol(s, 0, 10);
2999 if (sig > 0 || sig < NSIG) {
3000 SR_signum = sig;
3001 }
3002 }
3003
3004 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
3005 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
3006
3007 sigemptyset(&SR_sigset);
3008 sigaddset(&SR_sigset, SR_signum);
3009
3010 // Set up signal handler for suspend/resume.
3011 act.sa_flags = SA_RESTART|SA_SIGINFO;
3012 act.sa_handler = (void (*)(int)) SR_handler;
3013
3014 // SR_signum is blocked by default.
3015 // 4528190 - We also need to block pthread restart signal (32 on all
3016 // supported Linux platforms). Note that LinuxThreads need to block
3017 // this signal for all threads to work properly. So we don't have
3018 // to use hard-coded signal number when setting up the mask.
3019 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
3020
3021 if (sigaction(SR_signum, &act, 0) == -1) {
3022 return -1;
3023 }
3024
3025 // Save signal flag
3026 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
3027 return 0;
3028 }
3029
3030 static int SR_finalize() {
3031 return 0;
3032 }
3033
3034 static int sr_notify(OSThread* osthread) {
3035 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3036 assert_status(status == 0, status, "pthread_kill");
3037 return status;
3038 }
3039
3040 // "Randomly" selected value for how long we want to spin
3041 // before bailing out on suspending a thread, also how often
3042 // we send a signal to a thread we want to resume
3043 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3044 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3045
3046 // returns true on success and false on error - really an error is fatal
3047 // but this seems the normal response to library errors
3048 static bool do_suspend(OSThread* osthread) {
3049 assert(osthread->sr.is_running(), "thread should be running");
3050 // mark as suspended and send signal
3051
3052 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3053 // failed to switch, state wasn't running?
3054 ShouldNotReachHere();
3055 return false;
3056 }
3057
3058 if (sr_notify(osthread) != 0) {
3059 // try to cancel, switch to running
3060
3061 os::SuspendResume::State result = osthread->sr.cancel_suspend();
3062 if (result == os::SuspendResume::SR_RUNNING) {
3063 // cancelled
3064 return false;
3065 } else if (result == os::SuspendResume::SR_SUSPENDED) {
3066 // somehow managed to suspend
3067 return true;
3068 } else {
3069 ShouldNotReachHere();
3070 return false;
3071 }
3072 }
3073
3074 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3075
3076 for (int n = 0; !osthread->sr.is_suspended(); n++) {
3077 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
3078 os::yield_all();
3079 }
3080
3081 // timeout, try to cancel the request
3082 if (n >= RANDOMLY_LARGE_INTEGER) {
3083 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3084 if (cancelled == os::SuspendResume::SR_RUNNING) {
3085 return false;
3086 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3087 return true;
3088 } else {
3089 ShouldNotReachHere();
3090 return false;
3091 }
3092 }
3093 }
3094
3095 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3096 return true;
3097 }
3098
3099 static void do_resume(OSThread* osthread) {
3100 //assert(osthread->sr.is_suspended(), "thread should be suspended");
3101
3102 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3103 // failed to switch to WAKEUP_REQUEST
3104 ShouldNotReachHere();
3105 return;
3106 }
3107
3108 while (!osthread->sr.is_running()) {
3109 if (sr_notify(osthread) == 0) {
3110 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
3111 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
3112 os::yield_all();
3113 }
3114 }
3115 } else {
3116 ShouldNotReachHere();
3117 }
3118 }
3119
3120 guarantee(osthread->sr.is_running(), "Must be running!");
3121 }
3122
3123 ///////////////////////////////////////////////////////////////////////////////////
3124 // signal handling (except suspend/resume)
3125
3126 // This routine may be used by user applications as a "hook" to catch signals.
3127 // The user-defined signal handler must pass unrecognized signals to this
3128 // routine, and if it returns true (non-zero), then the signal handler must
3129 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3130 // routine will never retun false (zero), but instead will execute a VM panic
3131 // routine kill the process.
3132 //
3133 // If this routine returns false, it is OK to call it again. This allows
3134 // the user-defined signal handler to perform checks either before or after
3135 // the VM performs its own checks. Naturally, the user code would be making
3136 // a serious error if it tried to handle an exception (such as a null check
3137 // or breakpoint) that the VM was generating for its own correct operation.
3138 //
3139 // This routine may recognize any of the following kinds of signals:
3140 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3141 // It should be consulted by handlers for any of those signals.
3142 //
3143 // The caller of this routine must pass in the three arguments supplied
3144 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3145 // field of the structure passed to sigaction(). This routine assumes that
3146 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3147 //
3148 // Note that the VM will print warnings if it detects conflicting signal
3149 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3150 //
3151 extern "C" JNIEXPORT int
3152 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
3153
3154 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3155 // to be the thing to call; documentation is not terribly clear about whether
3156 // pthread_sigmask also works, and if it does, whether it does the same.
3157 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3158 const int rc = ::pthread_sigmask(how, set, oset);
3159 // return value semantics differ slightly for error case:
3160 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3161 // (so, pthread_sigmask is more theadsafe for error handling)
3162 // But success is always 0.
3163 return rc == 0 ? true : false;
3164 }
3165
3166 // Function to unblock all signals which are, according
3167 // to POSIX, typical program error signals. If they happen while being blocked,
3168 // they typically will bring down the process immediately.
3169 bool unblock_program_error_signals() {
3170 sigset_t set;
3171 ::sigemptyset(&set);
3172 ::sigaddset(&set, SIGILL);
3173 ::sigaddset(&set, SIGBUS);
3174 ::sigaddset(&set, SIGFPE);
3175 ::sigaddset(&set, SIGSEGV);
3176 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3177 }
3178
3179 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3180 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3181 assert(info != NULL && uc != NULL, "it must be old kernel");
3182
3183 // Never leave program error signals blocked;
3184 // on all our platforms they would bring down the process immediately when
3185 // getting raised while being blocked.
3186 unblock_program_error_signals();
3187
3188 JVM_handle_aix_signal(sig, info, uc, true);
3189 }
3190
3191
3192 // This boolean allows users to forward their own non-matching signals
3193 // to JVM_handle_aix_signal, harmlessly.
3194 bool os::Aix::signal_handlers_are_installed = false;
3195
3196 // For signal-chaining
3197 struct sigaction os::Aix::sigact[MAXSIGNUM];
3198 unsigned int os::Aix::sigs = 0;
3199 bool os::Aix::libjsig_is_loaded = false;
3200 typedef struct sigaction *(*get_signal_t)(int);
3201 get_signal_t os::Aix::get_signal_action = NULL;
3202
3203 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3204 struct sigaction *actp = NULL;
3205
3206 if (libjsig_is_loaded) {
3207 // Retrieve the old signal handler from libjsig
3208 actp = (*get_signal_action)(sig);
3209 }
3210 if (actp == NULL) {
3211 // Retrieve the preinstalled signal handler from jvm
3212 actp = get_preinstalled_handler(sig);
3213 }
3214
3215 return actp;
3216 }
3217
3218 static bool call_chained_handler(struct sigaction *actp, int sig,
3219 siginfo_t *siginfo, void *context) {
3220 // Call the old signal handler
3221 if (actp->sa_handler == SIG_DFL) {
3222 // It's more reasonable to let jvm treat it as an unexpected exception
3223 // instead of taking the default action.
3224 return false;
3225 } else if (actp->sa_handler != SIG_IGN) {
3226 if ((actp->sa_flags & SA_NODEFER) == 0) {
3227 // automaticlly block the signal
3228 sigaddset(&(actp->sa_mask), sig);
3229 }
3230
3231 sa_handler_t hand = NULL;
3232 sa_sigaction_t sa = NULL;
3233 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3234 // retrieve the chained handler
3235 if (siginfo_flag_set) {
3236 sa = actp->sa_sigaction;
3237 } else {
3238 hand = actp->sa_handler;
3239 }
3240
3241 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3242 actp->sa_handler = SIG_DFL;
3243 }
3244
3245 // try to honor the signal mask
3246 sigset_t oset;
3247 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3248
3249 // call into the chained handler
3250 if (siginfo_flag_set) {
3251 (*sa)(sig, siginfo, context);
3252 } else {
3253 (*hand)(sig);
3254 }
3255
3256 // restore the signal mask
3257 pthread_sigmask(SIG_SETMASK, &oset, 0);
3258 }
3259 // Tell jvm's signal handler the signal is taken care of.
3260 return true;
3261 }
3262
3263 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3264 bool chained = false;
3265 // signal-chaining
3266 if (UseSignalChaining) {
3267 struct sigaction *actp = get_chained_signal_action(sig);
3268 if (actp != NULL) {
3269 chained = call_chained_handler(actp, sig, siginfo, context);
3270 }
3271 }
3272 return chained;
3273 }
3274
3275 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3276 if ((((unsigned int)1 << sig) & sigs) != 0) {
3277 return &sigact[sig];
3278 }
3279 return NULL;
3280 }
3281
3282 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3283 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3284 sigact[sig] = oldAct;
3285 sigs |= (unsigned int)1 << sig;
3286 }
3287
3288 // for diagnostic
3289 int os::Aix::sigflags[MAXSIGNUM];
3290
3291 int os::Aix::get_our_sigflags(int sig) {
3292 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3293 return sigflags[sig];
3294 }
3295
3296 void os::Aix::set_our_sigflags(int sig, int flags) {
3297 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3298 sigflags[sig] = flags;
3299 }
3300
3301 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3302 // Check for overwrite.
3303 struct sigaction oldAct;
3304 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3305
3306 void* oldhand = oldAct.sa_sigaction
3307 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3308 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3309 // Renamed 'signalHandler' to avoid collision with other shared libs.
3310 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3311 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3312 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3313 if (AllowUserSignalHandlers || !set_installed) {
3314 // Do not overwrite; user takes responsibility to forward to us.
3315 return;
3316 } else if (UseSignalChaining) {
3317 // save the old handler in jvm
3318 save_preinstalled_handler(sig, oldAct);
3319 // libjsig also interposes the sigaction() call below and saves the
3320 // old sigaction on it own.
3321 } else {
3322 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3323 "%#lx for signal %d.", (long)oldhand, sig));
3324 }
3325 }
3326
3327 struct sigaction sigAct;
3328 sigfillset(&(sigAct.sa_mask));
3329 if (!set_installed) {
3330 sigAct.sa_handler = SIG_DFL;
3331 sigAct.sa_flags = SA_RESTART;
3332 } else {
3333 // Renamed 'signalHandler' to avoid collision with other shared libs.
3334 sigAct.sa_sigaction = javaSignalHandler;
3335 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3336 }
3337 // Save flags, which are set by ours
3338 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3339 sigflags[sig] = sigAct.sa_flags;
3340
3341 int ret = sigaction(sig, &sigAct, &oldAct);
3342 assert(ret == 0, "check");
3343
3344 void* oldhand2 = oldAct.sa_sigaction
3345 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3346 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3347 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3348 }
3349
3350 // install signal handlers for signals that HotSpot needs to
3351 // handle in order to support Java-level exception handling.
3352 void os::Aix::install_signal_handlers() {
3353 if (!signal_handlers_are_installed) {
3354 signal_handlers_are_installed = true;
3355
3356 // signal-chaining
3357 typedef void (*signal_setting_t)();
3358 signal_setting_t begin_signal_setting = NULL;
3359 signal_setting_t end_signal_setting = NULL;
3360 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3361 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3362 if (begin_signal_setting != NULL) {
3363 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3364 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3365 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3366 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3367 libjsig_is_loaded = true;
3368 assert(UseSignalChaining, "should enable signal-chaining");
3369 }
3370 if (libjsig_is_loaded) {
3371 // Tell libjsig jvm is setting signal handlers
3372 (*begin_signal_setting)();
3373 }
3374
3375 set_signal_handler(SIGSEGV, true);
3376 set_signal_handler(SIGPIPE, true);
3377 set_signal_handler(SIGBUS, true);
3378 set_signal_handler(SIGILL, true);
3379 set_signal_handler(SIGFPE, true);
3380 set_signal_handler(SIGTRAP, true);
3381 set_signal_handler(SIGXFSZ, true);
3382 set_signal_handler(SIGDANGER, true);
3383
3384 if (libjsig_is_loaded) {
3385 // Tell libjsig jvm finishes setting signal handlers
3386 (*end_signal_setting)();
3387 }
3388
3389 // We don't activate signal checker if libjsig is in place, we trust ourselves
3390 // and if UserSignalHandler is installed all bets are off.
3391 // Log that signal checking is off only if -verbose:jni is specified.
3392 if (CheckJNICalls) {
3393 if (libjsig_is_loaded) {
3394 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3395 check_signals = false;
3396 }
3397 if (AllowUserSignalHandlers) {
3398 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3399 check_signals = false;
3400 }
3401 // need to initialize check_signal_done
3402 ::sigemptyset(&check_signal_done);
3403 }
3404 }
3405 }
3406
3407 static const char* get_signal_handler_name(address handler,
3408 char* buf, int buflen) {
3409 int offset;
3410 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3411 if (found) {
3412 // skip directory names
3413 const char *p1, *p2;
3414 p1 = buf;
3415 size_t len = strlen(os::file_separator());
3416 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3417 // The way os::dll_address_to_library_name is implemented on Aix
3418 // right now, it always returns -1 for the offset which is not
3419 // terribly informative.
3420 // Will fix that. For now, omit the offset.
3421 jio_snprintf(buf, buflen, "%s", p1);
3422 } else {
3423 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3424 }
3425 return buf;
3426 }
3427
3428 static void print_signal_handler(outputStream* st, int sig,
3429 char* buf, size_t buflen) {
3430 struct sigaction sa;
3431 sigaction(sig, NULL, &sa);
3432
3433 st->print("%s: ", os::exception_name(sig, buf, buflen));
3434
3435 address handler = (sa.sa_flags & SA_SIGINFO)
3436 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3437 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3438
3439 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3440 st->print("SIG_DFL");
3441 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3442 st->print("SIG_IGN");
3443 } else {
3444 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3445 }
3446
3447 // Print readable mask.
3448 st->print(", sa_mask[0]=");
3449 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3450
3451 address rh = VMError::get_resetted_sighandler(sig);
3452 // May be, handler was resetted by VMError?
3453 if (rh != NULL) {
3454 handler = rh;
3455 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3456 }
3457
3458 // Print textual representation of sa_flags.
3459 st->print(", sa_flags=");
3460 os::Posix::print_sa_flags(st, sa.sa_flags);
3461
3462 // Check: is it our handler?
3463 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3464 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3465 // It is our signal handler.
3466 // Check for flags, reset system-used one!
3467 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3468 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3469 os::Aix::get_our_sigflags(sig));
3470 }
3471 }
3472 st->cr();
3473 }
3474
3475
3476 #define DO_SIGNAL_CHECK(sig) \
3477 if (!sigismember(&check_signal_done, sig)) \
3478 os::Aix::check_signal_handler(sig)
3479
3480 // This method is a periodic task to check for misbehaving JNI applications
3481 // under CheckJNI, we can add any periodic checks here
3482
3483 void os::run_periodic_checks() {
3484
3485 if (check_signals == false) return;
3486
3487 // SEGV and BUS if overridden could potentially prevent
3488 // generation of hs*.log in the event of a crash, debugging
3489 // such a case can be very challenging, so we absolutely
3490 // check the following for a good measure:
3491 DO_SIGNAL_CHECK(SIGSEGV);
3492 DO_SIGNAL_CHECK(SIGILL);
3493 DO_SIGNAL_CHECK(SIGFPE);
3494 DO_SIGNAL_CHECK(SIGBUS);
3495 DO_SIGNAL_CHECK(SIGPIPE);
3496 DO_SIGNAL_CHECK(SIGXFSZ);
3497 if (UseSIGTRAP) {
3498 DO_SIGNAL_CHECK(SIGTRAP);
3499 }
3500 DO_SIGNAL_CHECK(SIGDANGER);
3501
3502 // ReduceSignalUsage allows the user to override these handlers
3503 // see comments at the very top and jvm_solaris.h
3504 if (!ReduceSignalUsage) {
3505 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3506 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3507 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3508 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3509 }
3510
3511 DO_SIGNAL_CHECK(SR_signum);
3512 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3513 }
3514
3515 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3516
3517 static os_sigaction_t os_sigaction = NULL;
3518
3519 void os::Aix::check_signal_handler(int sig) {
3520 char buf[O_BUFLEN];
3521 address jvmHandler = NULL;
3522
3523 struct sigaction act;
3524 if (os_sigaction == NULL) {
3525 // only trust the default sigaction, in case it has been interposed
3526 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3527 if (os_sigaction == NULL) return;
3528 }
3529
3530 os_sigaction(sig, (struct sigaction*)NULL, &act);
3531
3532 address thisHandler = (act.sa_flags & SA_SIGINFO)
3533 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3534 : CAST_FROM_FN_PTR(address, act.sa_handler);
3535
3536
3537 switch(sig) {
3538 case SIGSEGV:
3539 case SIGBUS:
3540 case SIGFPE:
3541 case SIGPIPE:
3542 case SIGILL:
3543 case SIGXFSZ:
3544 // Renamed 'signalHandler' to avoid collision with other shared libs.
3545 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3546 break;
3547
3548 case SHUTDOWN1_SIGNAL:
3549 case SHUTDOWN2_SIGNAL:
3550 case SHUTDOWN3_SIGNAL:
3551 case BREAK_SIGNAL:
3552 jvmHandler = (address)user_handler();
3553 break;
3554
3555 case INTERRUPT_SIGNAL:
3556 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3557 break;
3558
3559 default:
3560 if (sig == SR_signum) {
3561 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3562 } else {
3563 return;
3564 }
3565 break;
3566 }
3567
3568 if (thisHandler != jvmHandler) {
3569 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3570 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3571 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3572 // No need to check this sig any longer
3573 sigaddset(&check_signal_done, sig);
3574 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3575 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3576 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3577 exception_name(sig, buf, O_BUFLEN));
3578 }
3579 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3580 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3581 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3582 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3583 // No need to check this sig any longer
3584 sigaddset(&check_signal_done, sig);
3585 }
3586
3587 // Dump all the signal
3588 if (sigismember(&check_signal_done, sig)) {
3589 print_signal_handlers(tty, buf, O_BUFLEN);
3590 }
3591 }
3592
3593 extern bool signal_name(int signo, char* buf, size_t len);
3594
3595 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3596 if (0 < exception_code && exception_code <= SIGRTMAX) {
3597 // signal
3598 if (!signal_name(exception_code, buf, size)) {
3599 jio_snprintf(buf, size, "SIG%d", exception_code);
3600 }
3601 return buf;
3602 } else {
3603 return NULL;
3604 }
3605 }
3606
3607 // To install functions for atexit system call
3608 extern "C" {
3609 static void perfMemory_exit_helper() {
3610 perfMemory_exit();
3611 }
3612 }
3613
3614 // This is called _before_ the most of global arguments have been parsed.
3615 void os::init(void) {
3616 // This is basic, we want to know if that ever changes.
3617 // (shared memory boundary is supposed to be a 256M aligned)
3618 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3619
3620 // First off, we need to know whether we run on AIX or PASE, and
3621 // the OS level we run on.
3622 os::Aix::initialize_os_info();
3623
3624 // Scan environment (SPEC1170 behaviour, etc)
3625 os::Aix::scan_environment();
3626
3627 // Check which pages are supported by AIX.
3628 os::Aix::query_multipage_support();
3629
3630 // Next, we need to initialize libo4 and libperfstat libraries.
3631 if (os::Aix::on_pase()) {
3632 os::Aix::initialize_libo4();
3633 } else {
3634 os::Aix::initialize_libperfstat();
3635 }
3636
3637 // Reset the perfstat information provided by ODM.
3638 if (os::Aix::on_aix()) {
3639 libperfstat::perfstat_reset();
3640 }
3641
3642 // Now initialze basic system properties. Note that for some of the values we
3643 // need libperfstat etc.
3644 os::Aix::initialize_system_info();
3645
3646 // Initialize large page support.
3647 if (UseLargePages) {
3648 os::large_page_init();
3649 if (!UseLargePages) {
3650 // initialize os::_page_sizes
3651 _page_sizes[0] = Aix::page_size();
3652 _page_sizes[1] = 0;
3653 if (Verbose) {
3654 fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n");
3655 }
3656 }
3657 } else {
3658 // initialize os::_page_sizes
3659 _page_sizes[0] = Aix::page_size();
3660 _page_sizes[1] = 0;
3661 }
3662
3663 // debug trace
3664 if (Verbose) {
3665 fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size());
3666 fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size());
3667 fprintf(stderr, "os::_page_sizes = ( ");
3668 for (int i = 0; _page_sizes[i]; i ++) {
3669 fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i]));
3670 }
3671 fprintf(stderr, ")\n");
3672 }
3673
3674 _initial_pid = getpid();
3675
3676 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3677
3678 init_random(1234567);
3679
3680 ThreadCritical::initialize();
3681
3682 // Main_thread points to the aboriginal thread.
3683 Aix::_main_thread = pthread_self();
3684
3685 initial_time_count = os::elapsed_counter();
3686 pthread_mutex_init(&dl_mutex, NULL);
3687 }
3688
3689 // this is called _after_ the global arguments have been parsed
3690 jint os::init_2(void) {
3691
3692 if (Verbose) {
3693 fprintf(stderr, "processor count: %d\n", os::_processor_count);
3694 fprintf(stderr, "physical memory: %lu\n", Aix::_physical_memory);
3695 }
3696
3697 // initially build up the loaded dll map
3698 LoadedLibraries::reload();
3699
3700 const int page_size = Aix::page_size();
3701 const int map_size = page_size;
3702
3703 address map_address = (address) MAP_FAILED;
3704 const int prot = PROT_READ;
3705 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3706
3707 // use optimized addresses for the polling page,
3708 // e.g. map it to a special 32-bit address.
3709 if (OptimizePollingPageLocation) {
3710 // architecture-specific list of address wishes:
3711 address address_wishes[] = {
3712 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3713 // PPC64: all address wishes are non-negative 32 bit values where
3714 // the lower 16 bits are all zero. we can load these addresses
3715 // with a single ppc_lis instruction.
3716 (address) 0x30000000, (address) 0x31000000,
3717 (address) 0x32000000, (address) 0x33000000,
3718 (address) 0x40000000, (address) 0x41000000,
3719 (address) 0x42000000, (address) 0x43000000,
3720 (address) 0x50000000, (address) 0x51000000,
3721 (address) 0x52000000, (address) 0x53000000,
3722 (address) 0x60000000, (address) 0x61000000,
3723 (address) 0x62000000, (address) 0x63000000
3724 };
3725 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3726
3727 // iterate over the list of address wishes:
3728 for (int i=0; i<address_wishes_length; i++) {
3729 // try to map with current address wish.
3730 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3731 // fail if the address is already mapped.
3732 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3733 map_size, prot,
3734 flags | MAP_FIXED,
3735 -1, 0);
3736 if (Verbose) {
3737 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3738 address_wishes[i], map_address + (ssize_t)page_size);
3739 }
3740
3741 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3742 // map succeeded and map_address is at wished address, exit loop.
3743 break;
3744 }
3745
3746 if (map_address != (address) MAP_FAILED) {
3747 // map succeeded, but polling_page is not at wished address, unmap and continue.
3748 ::munmap(map_address, map_size);
3749 map_address = (address) MAP_FAILED;
3750 }
3751 // map failed, continue loop.
3752 }
3753 } // end OptimizePollingPageLocation
3754
3755 if (map_address == (address) MAP_FAILED) {
3756 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3757 }
3758 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3759 os::set_polling_page(map_address);
3760
3761 if (!UseMembar) {
3762 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3763 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3764 os::set_memory_serialize_page(mem_serialize_page);
3765
3766 #ifndef PRODUCT
3767 if (Verbose && PrintMiscellaneous)
3768 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3769 #endif
3770 }
3771
3772 // initialize suspend/resume support - must do this before signal_sets_init()
3773 if (SR_initialize() != 0) {
3774 perror("SR_initialize failed");
3775 return JNI_ERR;
3776 }
3777
3778 Aix::signal_sets_init();
3779 Aix::install_signal_handlers();
3780
3781 // Check minimum allowable stack size for thread creation and to initialize
3782 // the java system classes, including StackOverflowError - depends on page
3783 // size. Add a page for compiler2 recursion in main thread.
3784 // Add in 2*BytesPerWord times page size to account for VM stack during
3785 // class initialization depending on 32 or 64 bit VM.
3786 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3787 (size_t)(StackYellowPages+StackRedPages+StackShadowPages +
3788 2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size());
3789
3790 size_t threadStackSizeInBytes = ThreadStackSize * K;
3791 if (threadStackSizeInBytes != 0 &&
3792 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3793 tty->print_cr("\nThe stack size specified is too small, "
3794 "Specify at least %dk",
3795 os::Aix::min_stack_allowed / K);
3796 return JNI_ERR;
3797 }
3798
3799 // Make the stack size a multiple of the page size so that
3800 // the yellow/red zones can be guarded.
3801 // note that this can be 0, if no default stacksize was set
3802 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3803
3804 Aix::libpthread_init();
3805
3806 if (MaxFDLimit) {
3807 // set the number of file descriptors to max. print out error
3808 // if getrlimit/setrlimit fails but continue regardless.
3809 struct rlimit nbr_files;
3810 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3811 if (status != 0) {
3812 if (PrintMiscellaneous && (Verbose || WizardMode))
3813 perror("os::init_2 getrlimit failed");
3814 } else {
3815 nbr_files.rlim_cur = nbr_files.rlim_max;
3816 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3817 if (status != 0) {
3818 if (PrintMiscellaneous && (Verbose || WizardMode))
3819 perror("os::init_2 setrlimit failed");
3820 }
3821 }
3822 }
3823
3824 if (PerfAllowAtExitRegistration) {
3825 // only register atexit functions if PerfAllowAtExitRegistration is set.
3826 // atexit functions can be delayed until process exit time, which
3827 // can be problematic for embedded VM situations. Embedded VMs should
3828 // call DestroyJavaVM() to assure that VM resources are released.
3829
3830 // note: perfMemory_exit_helper atexit function may be removed in
3831 // the future if the appropriate cleanup code can be added to the
3832 // VM_Exit VMOperation's doit method.
3833 if (atexit(perfMemory_exit_helper) != 0) {
3834 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3835 }
3836 }
3837
3838 return JNI_OK;
3839 }
3840
3841 // this is called at the end of vm_initialization
3842 void os::init_3(void) {
3843 return;
3844 }
3845
3846 // Mark the polling page as unreadable
3847 void os::make_polling_page_unreadable(void) {
3848 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3849 fatal("Could not disable polling page");
3850 }
3851 };
3852
3853 // Mark the polling page as readable
3854 void os::make_polling_page_readable(void) {
3855 // Changed according to os_linux.cpp.
3856 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3857 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
3858 }
3859 };
3860
3861 int os::active_processor_count() {
3862 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3863 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3864 return online_cpus;
3865 }
3866
3867 void os::set_native_thread_name(const char *name) {
3868 // Not yet implemented.
3869 return;
3870 }
3871
3872 bool os::distribute_processes(uint length, uint* distribution) {
3873 // Not yet implemented.
3874 return false;
3875 }
3876
3877 bool os::bind_to_processor(uint processor_id) {
3878 // Not yet implemented.
3879 return false;
3880 }
3881
3882 void os::SuspendedThreadTask::internal_do_task() {
3883 if (do_suspend(_thread->osthread())) {
3884 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3885 do_task(context);
3886 do_resume(_thread->osthread());
3887 }
3888 }
3889
3890 class PcFetcher : public os::SuspendedThreadTask {
3891 public:
3892 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3893 ExtendedPC result();
3894 protected:
3895 void do_task(const os::SuspendedThreadTaskContext& context);
3896 private:
3897 ExtendedPC _epc;
3898 };
3899
3900 ExtendedPC PcFetcher::result() {
3901 guarantee(is_done(), "task is not done yet.");
3902 return _epc;
3903 }
3904
3905 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3906 Thread* thread = context.thread();
3907 OSThread* osthread = thread->osthread();
3908 if (osthread->ucontext() != NULL) {
3909 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3910 } else {
3911 // NULL context is unexpected, double-check this is the VMThread.
3912 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3913 }
3914 }
3915
3916 // Suspends the target using the signal mechanism and then grabs the PC before
3917 // resuming the target. Used by the flat-profiler only
3918 ExtendedPC os::get_thread_pc(Thread* thread) {
3919 // Make sure that it is called by the watcher for the VMThread.
3920 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3921 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3922
3923 PcFetcher fetcher(thread);
3924 fetcher.run();
3925 return fetcher.result();
3926 }
3927
3928 // Not neede on Aix.
3929 // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) {
3930 // }
3931
3932 ////////////////////////////////////////////////////////////////////////////////
3933 // debug support
3934
3935 static address same_page(address x, address y) {
3936 intptr_t page_bits = -os::vm_page_size();
3937 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3938 return x;
3939 else if (x > y)
3940 return (address)(intptr_t(y) | ~page_bits) + 1;
3941 else
3942 return (address)(intptr_t(y) & page_bits);
3943 }
3944
3945 bool os::find(address addr, outputStream* st) {
3946
3947 st->print(PTR_FORMAT ": ", addr);
3948
3949 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3950 if (lib) {
3951 lib->print(st);
3952 return true;
3953 } else {
3954 lib = LoadedLibraries::find_for_data_address(addr);
3955 if (lib) {
3956 lib->print(st);
3957 return true;
3958 } else {
3959 st->print_cr("(outside any module)");
3960 }
3961 }
3962
3963 return false;
3964 }
3965
3966 ////////////////////////////////////////////////////////////////////////////////
3967 // misc
3968
3969 // This does not do anything on Aix. This is basically a hook for being
3970 // able to use structured exception handling (thread-local exception filters)
3971 // on, e.g., Win32.
3972 void
3973 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3974 JavaCallArguments* args, Thread* thread) {
3975 f(value, method, args, thread);
3976 }
3977
3978 void os::print_statistics() {
3979 }
3980
3981 int os::message_box(const char* title, const char* message) {
3982 int i;
3983 fdStream err(defaultStream::error_fd());
3984 for (i = 0; i < 78; i++) err.print_raw("=");
3985 err.cr();
3986 err.print_raw_cr(title);
3987 for (i = 0; i < 78; i++) err.print_raw("-");
3988 err.cr();
3989 err.print_raw_cr(message);
3990 for (i = 0; i < 78; i++) err.print_raw("=");
3991 err.cr();
3992
3993 char buf[16];
3994 // Prevent process from exiting upon "read error" without consuming all CPU
3995 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3996
3997 return buf[0] == 'y' || buf[0] == 'Y';
3998 }
3999
4000 int os::stat(const char *path, struct stat *sbuf) {
4001 char pathbuf[MAX_PATH];
4002 if (strlen(path) > MAX_PATH - 1) {
4003 errno = ENAMETOOLONG;
4004 return -1;
4005 }
4006 os::native_path(strcpy(pathbuf, path));
4007 return ::stat(pathbuf, sbuf);
4008 }
4009
4010 bool os::check_heap(bool force) {
4011 return true;
4012 }
4013
4014 // int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
4015 // return ::vsnprintf(buf, count, format, args);
4016 // }
4017
4018 // Is a (classpath) directory empty?
4019 bool os::dir_is_empty(const char* path) {
4020 DIR *dir = NULL;
4021 struct dirent *ptr;
4022
4023 dir = opendir(path);
4024 if (dir == NULL) return true;
4025
4026 /* Scan the directory */
4027 bool result = true;
4028 char buf[sizeof(struct dirent) + MAX_PATH];
4029 while (result && (ptr = ::readdir(dir)) != NULL) {
4030 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4031 result = false;
4032 }
4033 }
4034 closedir(dir);
4035 return result;
4036 }
4037
4038 // This code originates from JDK's sysOpen and open64_w
4039 // from src/solaris/hpi/src/system_md.c
4040
4041 #ifndef O_DELETE
4042 #define O_DELETE 0x10000
4043 #endif
4044
4045 // Open a file. Unlink the file immediately after open returns
4046 // if the specified oflag has the O_DELETE flag set.
4047 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
4048
4049 int os::open(const char *path, int oflag, int mode) {
4050
4051 if (strlen(path) > MAX_PATH - 1) {
4052 errno = ENAMETOOLONG;
4053 return -1;
4054 }
4055 int fd;
4056 int o_delete = (oflag & O_DELETE);
4057 oflag = oflag & ~O_DELETE;
4058
4059 fd = ::open64(path, oflag, mode);
4060 if (fd == -1) return -1;
4061
4062 // If the open succeeded, the file might still be a directory.
4063 {
4064 struct stat64 buf64;
4065 int ret = ::fstat64(fd, &buf64);
4066 int st_mode = buf64.st_mode;
4067
4068 if (ret != -1) {
4069 if ((st_mode & S_IFMT) == S_IFDIR) {
4070 errno = EISDIR;
4071 ::close(fd);
4072 return -1;
4073 }
4074 } else {
4075 ::close(fd);
4076 return -1;
4077 }
4078 }
4079
4080 // All file descriptors that are opened in the JVM and not
4081 // specifically destined for a subprocess should have the
4082 // close-on-exec flag set. If we don't set it, then careless 3rd
4083 // party native code might fork and exec without closing all
4084 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4085 // UNIXProcess.c), and this in turn might:
4086 //
4087 // - cause end-of-file to fail to be detected on some file
4088 // descriptors, resulting in mysterious hangs, or
4089 //
4090 // - might cause an fopen in the subprocess to fail on a system
4091 // suffering from bug 1085341.
4092 //
4093 // (Yes, the default setting of the close-on-exec flag is a Unix
4094 // design flaw.)
4095 //
4096 // See:
4097 // 1085341: 32-bit stdio routines should support file descriptors >255
4098 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4099 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4100 #ifdef FD_CLOEXEC
4101 {
4102 int flags = ::fcntl(fd, F_GETFD);
4103 if (flags != -1)
4104 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4105 }
4106 #endif
4107
4108 if (o_delete != 0) {
4109 ::unlink(path);
4110 }
4111 return fd;
4112 }
4113
4114
4115 // create binary file, rewriting existing file if required
4116 int os::create_binary_file(const char* path, bool rewrite_existing) {
4117 int oflags = O_WRONLY | O_CREAT;
4118 if (!rewrite_existing) {
4119 oflags |= O_EXCL;
4120 }
4121 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4122 }
4123
4124 // return current position of file pointer
4125 jlong os::current_file_offset(int fd) {
4126 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4127 }
4128
4129 // move file pointer to the specified offset
4130 jlong os::seek_to_file_offset(int fd, jlong offset) {
4131 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4132 }
4133
4134 // This code originates from JDK's sysAvailable
4135 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4136
4137 int os::available(int fd, jlong *bytes) {
4138 jlong cur, end;
4139 int mode;
4140 struct stat64 buf64;
4141
4142 if (::fstat64(fd, &buf64) >= 0) {
4143 mode = buf64.st_mode;
4144 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4145 // XXX: is the following call interruptible? If so, this might
4146 // need to go through the INTERRUPT_IO() wrapper as for other
4147 // blocking, interruptible calls in this file.
4148 int n;
4149 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4150 *bytes = n;
4151 return 1;
4152 }
4153 }
4154 }
4155 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4156 return 0;
4157 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4158 return 0;
4159 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4160 return 0;
4161 }
4162 *bytes = end - cur;
4163 return 1;
4164 }
4165
4166 int os::socket_available(int fd, jint *pbytes) {
4167 // Linux doc says EINTR not returned, unlike Solaris
4168 int ret = ::ioctl(fd, FIONREAD, pbytes);
4169
4170 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
4171 // is expected to return 0 on failure and 1 on success to the jdk.
4172 return (ret < 0) ? 0 : 1;
4173 }
4174
4175 // Map a block of memory.
4176 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4177 char *addr, size_t bytes, bool read_only,
4178 bool allow_exec) {
4179 Unimplemented();
4180 return NULL;
4181 }
4182
4183
4184 // Remap a block of memory.
4185 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4186 char *addr, size_t bytes, bool read_only,
4187 bool allow_exec) {
4188 // same as map_memory() on this OS
4189 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4190 allow_exec);
4191 }
4192
4193 // Unmap a block of memory.
4194 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4195 return munmap(addr, bytes) == 0;
4196 }
4197
4198 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4199 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4200 // of a thread.
4201 //
4202 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4203 // the fast estimate available on the platform.
4204
4205 jlong os::current_thread_cpu_time() {
4206 // return user + sys since the cost is the same
4207 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4208 assert(n >= 0, "negative CPU time");
4209 return n;
4210 }
4211
4212 jlong os::thread_cpu_time(Thread* thread) {
4213 // consistent with what current_thread_cpu_time() returns
4214 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4215 assert(n >= 0, "negative CPU time");
4216 return n;
4217 }
4218
4219 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4220 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4221 assert(n >= 0, "negative CPU time");
4222 return n;
4223 }
4224
4225 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4226 bool error = false;
4227
4228 jlong sys_time = 0;
4229 jlong user_time = 0;
4230
4231 // reimplemented using getthrds64().
4232 //
4233 // goes like this:
4234 // For the thread in question, get the kernel thread id. Then get the
4235 // kernel thread statistics using that id.
4236 //
4237 // This only works of course when no pthread scheduling is used,
4238 // ie there is a 1:1 relationship to kernel threads.
4239 // On AIX, see AIXTHREAD_SCOPE variable.
4240
4241 pthread_t pthtid = thread->osthread()->pthread_id();
4242
4243 // retrieve kernel thread id for the pthread:
4244 tid64_t tid = 0;
4245 struct __pthrdsinfo pinfo;
4246 // I just love those otherworldly IBM APIs which force me to hand down
4247 // dummy buffers for stuff I dont care for...
4248 char dummy[1];
4249 int dummy_size = sizeof(dummy);
4250 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4251 dummy, &dummy_size) == 0) {
4252 tid = pinfo.__pi_tid;
4253 } else {
4254 tty->print_cr("pthread_getthrds_np failed.");
4255 error = true;
4256 }
4257
4258 // retrieve kernel timing info for that kernel thread
4259 if (!error) {
4260 struct thrdentry64 thrdentry;
4261 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4262 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4263 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4264 } else {
4265 tty->print_cr("pthread_getthrds_np failed.");
4266 error = true;
4267 }
4268 }
4269
4270 if (p_sys_time) {
4271 *p_sys_time = sys_time;
4272 }
4273
4274 if (p_user_time) {
4275 *p_user_time = user_time;
4276 }
4277
4278 if (error) {
4279 return false;
4280 }
4281
4282 return true;
4283 }
4284
4285 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4286 jlong sys_time;
4287 jlong user_time;
4288
4289 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4290 return -1;
4291 }
4292
4293 return user_sys_cpu_time ? sys_time + user_time : user_time;
4294 }
4295
4296 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4297 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4298 info_ptr->may_skip_backward = false; // elapsed time not wall time
4299 info_ptr->may_skip_forward = false; // elapsed time not wall time
4300 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4301 }
4302
4303 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4304 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4305 info_ptr->may_skip_backward = false; // elapsed time not wall time
4306 info_ptr->may_skip_forward = false; // elapsed time not wall time
4307 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4308 }
4309
4310 bool os::is_thread_cpu_time_supported() {
4311 return true;
4312 }
4313
4314 // System loadavg support. Returns -1 if load average cannot be obtained.
4315 // For now just return the system wide load average (no processor sets).
4316 int os::loadavg(double values[], int nelem) {
4317
4318 // Implemented using libperfstat on AIX.
4319
4320 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4321 guarantee(values, "argument error");
4322
4323 if (os::Aix::on_pase()) {
4324 Unimplemented();
4325 return -1;
4326 } else {
4327 // AIX: use libperfstat
4328 //
4329 // See also:
4330 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4331 // /usr/include/libperfstat.h:
4332
4333 // Use the already AIX version independent get_cpuinfo.
4334 os::Aix::cpuinfo_t ci;
4335 if (os::Aix::get_cpuinfo(&ci)) {
4336 for (int i = 0; i < nelem; i++) {
4337 values[i] = ci.loadavg[i];
4338 }
4339 } else {
4340 return -1;
4341 }
4342 return nelem;
4343 }
4344 }
4345
4346 void os::pause() {
4347 char filename[MAX_PATH];
4348 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4349 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4350 } else {
4351 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4352 }
4353
4354 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4355 if (fd != -1) {
4356 struct stat buf;
4357 ::close(fd);
4358 while (::stat(filename, &buf) == 0) {
4359 (void)::poll(NULL, 0, 100);
4360 }
4361 } else {
4362 jio_fprintf(stderr,
4363 "Could not open pause file '%s', continuing immediately.\n", filename);
4364 }
4365 }
4366
4367 bool os::Aix::is_primordial_thread() {
4368 if (pthread_self() == (pthread_t)1) {
4369 return true;
4370 } else {
4371 return false;
4372 }
4373 }
4374
4375 // OS recognitions (PASE/AIX, OS level) call this before calling any
4376 // one of Aix::on_pase(), Aix::os_version() static
4377 void os::Aix::initialize_os_info() {
4378
4379 assert(_on_pase == -1 && _os_version == -1, "already called.");
4380
4381 struct utsname uts;
4382 memset(&uts, 0, sizeof(uts));
4383 strcpy(uts.sysname, "?");
4384 if (::uname(&uts) == -1) {
4385 fprintf(stderr, "uname failed (%d)\n", errno);
4386 guarantee(0, "Could not determine whether we run on AIX or PASE");
4387 } else {
4388 if (Verbose) {
4389 fprintf(stderr,"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 }
4393 const int major = atoi(uts.version);
4394 assert(major > 0, "invalid OS version");
4395 const int minor = atoi(uts.release);
4396 assert(minor > 0, "invalid OS release");
4397 _os_version = (major << 8) | minor;
4398 if (strcmp(uts.sysname, "OS400") == 0) {
4399 Unimplemented();
4400 } else if (strcmp(uts.sysname, "AIX") == 0) {
4401 // We run on AIX. We do not support versions older than AIX 5.3.
4402 _on_pase = 0;
4403 if (_os_version < 0x0503) {
4404 fprintf(stderr, "AIX release older than AIX 5.3 not supported.\n");
4405 assert(false, "AIX release too old.");
4406 } else {
4407 if (Verbose) {
4408 fprintf(stderr, "We run on AIX %d.%d\n", major, minor);
4409 }
4410 }
4411 } else {
4412 assert(false, "unknown OS");
4413 }
4414 }
4415
4416 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4417
4418 } // end: os::Aix::initialize_os_info()
4419
4420 // Scan environment for important settings which might effect the VM.
4421 // Trace out settings. Warn about invalid settings and/or correct them.
4422 //
4423 // Must run after os::Aix::initialue_os_info().
4424 void os::Aix::scan_environment() {
4425
4426 char* p;
4427 int rc;
4428
4429 // Warn explicity if EXTSHM=ON is used. That switch changes how
4430 // System V shared memory behaves. One effect is that page size of
4431 // shared memory cannot be change dynamically, effectivly preventing
4432 // large pages from working.
4433 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4434 // recommendation is (in OSS notes) to switch it off.
4435 p = ::getenv("EXTSHM");
4436 if (Verbose) {
4437 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4438 }
4439 if (p && strcmp(p, "ON") == 0) {
4440 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4441 _extshm = 1;
4442 } else {
4443 _extshm = 0;
4444 }
4445
4446 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4447 // Not tested, not supported.
4448 //
4449 // Note that it might be worth the trouble to test and to require it, if only to
4450 // get useful return codes for mprotect.
4451 //
4452 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4453 // exec() ? before loading the libjvm ? ....)
4454 p = ::getenv("XPG_SUS_ENV");
4455 if (Verbose) {
4456 fprintf(stderr, "XPG_SUS_ENV=%s.\n", p ? p : "<unset>");
4457 }
4458 if (p && strcmp(p, "ON") == 0) {
4459 _xpg_sus_mode = 1;
4460 fprintf(stderr, "Unsupported setting: XPG_SUS_ENV=ON\n");
4461 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4462 // clobber address ranges. If we ever want to support that, we have to do some
4463 // testing first.
4464 guarantee(false, "XPG_SUS_ENV=ON not supported");
4465 } else {
4466 _xpg_sus_mode = 0;
4467 }
4468
4469 // Switch off AIX internal (pthread) guard pages. This has
4470 // immediate effect for any pthread_create calls which follow.
4471 p = ::getenv("AIXTHREAD_GUARDPAGES");
4472 if (Verbose) {
4473 fprintf(stderr, "AIXTHREAD_GUARDPAGES=%s.\n", p ? p : "<unset>");
4474 fprintf(stderr, "setting AIXTHREAD_GUARDPAGES=0.\n");
4475 }
4476 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4477 guarantee(rc == 0, "");
4478
4479 } // end: os::Aix::scan_environment()
4480
4481 // PASE: initialize the libo4 library (AS400 PASE porting library).
4482 void os::Aix::initialize_libo4() {
4483 Unimplemented();
4484 }
4485
4486 // AIX: initialize the libperfstat library (we load this dynamically
4487 // because it is only available on AIX.
4488 void os::Aix::initialize_libperfstat() {
4489
4490 assert(os::Aix::on_aix(), "AIX only");
4491
4492 if (!libperfstat::init()) {
4493 fprintf(stderr, "libperfstat initialization failed.\n");
4494 assert(false, "libperfstat initialization failed");
4495 } else {
4496 if (Verbose) {
4497 fprintf(stderr, "libperfstat initialized.\n");
4498 }
4499 }
4500 } // end: os::Aix::initialize_libperfstat
4501
4502 /////////////////////////////////////////////////////////////////////////////
4503 // thread stack
4504
4505 // function to query the current stack size using pthread_getthrds_np
4506 //
4507 // ! do not change anything here unless you know what you are doing !
4508 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4509
4510 // This only works when invoked on a pthread. As we agreed not to use
4511 // primordial threads anyway, I assert here
4512 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4513
4514 // information about this api can be found (a) in the pthread.h header and
4515 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4516 //
4517 // The use of this API to find out the current stack is kind of undefined.
4518 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4519 // enough for cases where I let the pthread library create its stacks. For cases
4520 // where I create an own stack and pass this to pthread_create, it seems not to
4521 // work (the returned stack size in that case is 0).
4522
4523 pthread_t tid = pthread_self();
4524 struct __pthrdsinfo pinfo;
4525 char dummy[1]; // we only need this to satisfy the api and to not get E
4526 int dummy_size = sizeof(dummy);
4527
4528 memset(&pinfo, 0, sizeof(pinfo));
4529
4530 const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4531 sizeof(pinfo), dummy, &dummy_size);
4532
4533 if (rc != 0) {
4534 fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc);
4535 guarantee(0, "pthread_getthrds_np failed");
4536 }
4537
4538 guarantee(pinfo.__pi_stackend, "returned stack base invalid");
4539
4540 // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack
4541 // (when handing down a stack to pthread create, see pthread_attr_setstackaddr).
4542 // Not sure what to do here - I feel inclined to forbid this use case completely.
4543 guarantee(pinfo.__pi_stacksize, "returned stack size invalid");
4544
4545 // On AIX, stacks are not necessarily page aligned so round the base and size accordingly
4546 if (p_stack_base) {
4547 (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size());
4548 }
4549
4550 if (p_stack_size) {
4551 (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size();
4552 }
4553
4554 #ifndef PRODUCT
4555 if (Verbose) {
4556 fprintf(stderr,
4557 "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT
4558 ", real stack_size=" INTPTR_FORMAT
4559 ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n",
4560 (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize,
4561 (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()),
4562 pinfo.__pi_stacksize - os::Aix::stack_page_size());
4563 }
4564 #endif
4565
4566 } // end query_stack_dimensions
4567
4568 // get the current stack base from the OS (actually, the pthread library)
4569 address os::current_stack_base() {
4570 address p;
4571 query_stack_dimensions(&p, 0);
4572 return p;
4573 }
4574
4575 // get the current stack size from the OS (actually, the pthread library)
4576 size_t os::current_stack_size() {
4577 size_t s;
4578 query_stack_dimensions(0, &s);
4579 return s;
4580 }
4581
4582 // Refer to the comments in os_solaris.cpp park-unpark.
4583 //
4584 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4585 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4586 // For specifics regarding the bug see GLIBC BUGID 261237 :
4587 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4588 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4589 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4590 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4591 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4592 // and monitorenter when we're using 1-0 locking. All those operations may result in
4593 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4594 // of libpthread avoids the problem, but isn't practical.
4595 //
4596 // Possible remedies:
4597 //
4598 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4599 // This is palliative and probabilistic, however. If the thread is preempted
4600 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4601 // than the minimum period may have passed, and the abstime may be stale (in the
4602 // past) resultin in a hang. Using this technique reduces the odds of a hang
4603 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4604 //
4605 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4606 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4607 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4608 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4609 // thread.
4610 //
4611 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4612 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4613 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4614 // This also works well. In fact it avoids kernel-level scalability impediments
4615 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4616 // timers in a graceful fashion.
4617 //
4618 // 4. When the abstime value is in the past it appears that control returns
4619 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4620 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4621 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4622 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4623 // It may be possible to avoid reinitialization by checking the return
4624 // value from pthread_cond_timedwait(). In addition to reinitializing the
4625 // condvar we must establish the invariant that cond_signal() is only called
4626 // within critical sections protected by the adjunct mutex. This prevents
4627 // cond_signal() from "seeing" a condvar that's in the midst of being
4628 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4629 // desirable signal-after-unlock optimization that avoids futile context switching.
4630 //
4631 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4632 // structure when a condvar is used or initialized. cond_destroy() would
4633 // release the helper structure. Our reinitialize-after-timedwait fix
4634 // put excessive stress on malloc/free and locks protecting the c-heap.
4635 //
4636 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4637 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4638 // and only enabling the work-around for vulnerable environments.
4639
4640 // utility to compute the abstime argument to timedwait:
4641 // millis is the relative timeout time
4642 // abstime will be the absolute timeout time
4643 // TODO: replace compute_abstime() with unpackTime()
4644
4645 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4646 if (millis < 0) millis = 0;
4647 struct timeval now;
4648 int status = gettimeofday(&now, NULL);
4649 assert(status == 0, "gettimeofday");
4650 jlong seconds = millis / 1000;
4651 millis %= 1000;
4652 if (seconds > 50000000) { // see man cond_timedwait(3T)
4653 seconds = 50000000;
4654 }
4655 abstime->tv_sec = now.tv_sec + seconds;
4656 long usec = now.tv_usec + millis * 1000;
4657 if (usec >= 1000000) {
4658 abstime->tv_sec += 1;
4659 usec -= 1000000;
4660 }
4661 abstime->tv_nsec = usec * 1000;
4662 return abstime;
4663 }
4664
4665
4666 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4667 // Conceptually TryPark() should be equivalent to park(0).
4668
4669 int os::PlatformEvent::TryPark() {
4670 for (;;) {
4671 const int v = _Event;
4672 guarantee ((v == 0) || (v == 1), "invariant");
4673 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4674 }
4675 }
4676
4677 void os::PlatformEvent::park() { // AKA "down()"
4678 // Invariant: Only the thread associated with the Event/PlatformEvent
4679 // may call park().
4680 // TODO: assert that _Assoc != NULL or _Assoc == Self
4681 int v;
4682 for (;;) {
4683 v = _Event;
4684 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4685 }
4686 guarantee (v >= 0, "invariant");
4687 if (v == 0) {
4688 // Do this the hard way by blocking ...
4689 int status = pthread_mutex_lock(_mutex);
4690 assert_status(status == 0, status, "mutex_lock");
4691 guarantee (_nParked == 0, "invariant");
4692 ++ _nParked;
4693 while (_Event < 0) {
4694 status = pthread_cond_wait(_cond, _mutex);
4695 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4696 }
4697 -- _nParked;
4698
4699 // In theory we could move the ST of 0 into _Event past the unlock(),
4700 // but then we'd need a MEMBAR after the ST.
4701 _Event = 0;
4702 status = pthread_mutex_unlock(_mutex);
4703 assert_status(status == 0, status, "mutex_unlock");
4704 }
4705 guarantee (_Event >= 0, "invariant");
4706 }
4707
4708 int os::PlatformEvent::park(jlong millis) {
4709 guarantee (_nParked == 0, "invariant");
4710
4711 int v;
4712 for (;;) {
4713 v = _Event;
4714 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4715 }
4716 guarantee (v >= 0, "invariant");
4717 if (v != 0) return OS_OK;
4718
4719 // We do this the hard way, by blocking the thread.
4720 // Consider enforcing a minimum timeout value.
4721 struct timespec abst;
4722 compute_abstime(&abst, millis);
4723
4724 int ret = OS_TIMEOUT;
4725 int status = pthread_mutex_lock(_mutex);
4726 assert_status(status == 0, status, "mutex_lock");
4727 guarantee (_nParked == 0, "invariant");
4728 ++_nParked;
4729
4730 // Object.wait(timo) will return because of
4731 // (a) notification
4732 // (b) timeout
4733 // (c) thread.interrupt
4734 //
4735 // Thread.interrupt and object.notify{All} both call Event::set.
4736 // That is, we treat thread.interrupt as a special case of notification.
4737 // We must filter out spurious wakeups.
4738 // We assume all ETIME returns are valid.
4739 //
4740 // TODO: properly differentiate simultaneous notify+interrupt.
4741 // In that case, we should propagate the notify to another waiter.
4742
4743 while (_Event < 0) {
4744 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4745 assert_status(status == 0 || status == ETIMEDOUT,
4746 status, "cond_timedwait");
4747 if (!FilterSpuriousWakeups) break; // previous semantics
4748 if (status == ETIMEDOUT) break;
4749 // We consume and ignore EINTR and spurious wakeups.
4750 }
4751 --_nParked;
4752 if (_Event >= 0) {
4753 ret = OS_OK;
4754 }
4755 _Event = 0;
4756 status = pthread_mutex_unlock(_mutex);
4757 assert_status(status == 0, status, "mutex_unlock");
4758 assert (_nParked == 0, "invariant");
4759 return ret;
4760 }
4761
4762 void os::PlatformEvent::unpark() {
4763 int v, AnyWaiters;
4764 for (;;) {
4765 v = _Event;
4766 if (v > 0) {
4767 // The LD of _Event could have reordered or be satisfied
4768 // by a read-aside from this processor's write buffer.
4769 // To avoid problems execute a barrier and then
4770 // ratify the value.
4771 OrderAccess::fence();
4772 if (_Event == v) return;
4773 continue;
4774 }
4775 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4776 }
4777 if (v < 0) {
4778 // Wait for the thread associated with the event to vacate
4779 int status = pthread_mutex_lock(_mutex);
4780 assert_status(status == 0, status, "mutex_lock");
4781 AnyWaiters = _nParked;
4782
4783 if (AnyWaiters != 0) {
4784 // We intentional signal *after* dropping the lock
4785 // to avoid a common class of futile wakeups.
4786 status = pthread_cond_signal(_cond);
4787 assert_status(status == 0, status, "cond_signal");
4788 }
4789 // Mutex should be locked for pthread_cond_signal(_cond).
4790 status = pthread_mutex_unlock(_mutex);
4791 assert_status(status == 0, status, "mutex_unlock");
4792 }
4793
4794 // Note that we signal() _after dropping the lock for "immortal" Events.
4795 // This is safe and avoids a common class of futile wakeups. In rare
4796 // circumstances this can cause a thread to return prematurely from
4797 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4798 // simply re-test the condition and re-park itself.
4799 }
4800
4801
4802 // JSR166
4803 // -------------------------------------------------------
4804
4805 //
4806 // The solaris and linux implementations of park/unpark are fairly
4807 // conservative for now, but can be improved. They currently use a
4808 // mutex/condvar pair, plus a a count.
4809 // Park decrements count if > 0, else does a condvar wait. Unpark
4810 // sets count to 1 and signals condvar. Only one thread ever waits
4811 // on the condvar. Contention seen when trying to park implies that someone
4812 // is unparking you, so don't wait. And spurious returns are fine, so there
4813 // is no need to track notifications.
4814 //
4815
4816 #define MAX_SECS 100000000
4817 //
4818 // This code is common to linux and solaris and will be moved to a
4819 // common place in dolphin.
4820 //
4821 // The passed in time value is either a relative time in nanoseconds
4822 // or an absolute time in milliseconds. Either way it has to be unpacked
4823 // into suitable seconds and nanoseconds components and stored in the
4824 // given timespec structure.
4825 // Given time is a 64-bit value and the time_t used in the timespec is only
4826 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4827 // overflow if times way in the future are given. Further on Solaris versions
4828 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4829 // number of seconds, in abstime, is less than current_time + 100,000,000.
4830 // As it will be 28 years before "now + 100000000" will overflow we can
4831 // ignore overflow and just impose a hard-limit on seconds using the value
4832 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4833 // years from "now".
4834 //
4835
4836 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4837 assert (time > 0, "convertTime");
4838
4839 struct timeval now;
4840 int status = gettimeofday(&now, NULL);
4841 assert(status == 0, "gettimeofday");
4842
4843 time_t max_secs = now.tv_sec + MAX_SECS;
4844
4845 if (isAbsolute) {
4846 jlong secs = time / 1000;
4847 if (secs > max_secs) {
4848 absTime->tv_sec = max_secs;
4849 }
4850 else {
4851 absTime->tv_sec = secs;
4852 }
4853 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4854 }
4855 else {
4856 jlong secs = time / NANOSECS_PER_SEC;
4857 if (secs >= MAX_SECS) {
4858 absTime->tv_sec = max_secs;
4859 absTime->tv_nsec = 0;
4860 }
4861 else {
4862 absTime->tv_sec = now.tv_sec + secs;
4863 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4864 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4865 absTime->tv_nsec -= NANOSECS_PER_SEC;
4866 ++absTime->tv_sec; // note: this must be <= max_secs
4867 }
4868 }
4869 }
4870 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4871 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4872 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4873 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4874 }
4875
4876 void Parker::park(bool isAbsolute, jlong time) {
4877 // Optional fast-path check:
4878 // Return immediately if a permit is available.
4879 if (_counter > 0) {
4880 _counter = 0;
4881 OrderAccess::fence();
4882 return;
4883 }
4884
4885 Thread* thread = Thread::current();
4886 assert(thread->is_Java_thread(), "Must be JavaThread");
4887 JavaThread *jt = (JavaThread *)thread;
4888
4889 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4890 // Check interrupt before trying to wait
4891 if (Thread::is_interrupted(thread, false)) {
4892 return;
4893 }
4894
4895 // Next, demultiplex/decode time arguments
4896 timespec absTime;
4897 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4898 return;
4899 }
4900 if (time > 0) {
4901 unpackTime(&absTime, isAbsolute, time);
4902 }
4903
4904
4905 // Enter safepoint region
4906 // Beware of deadlocks such as 6317397.
4907 // The per-thread Parker:: mutex is a classic leaf-lock.
4908 // In particular a thread must never block on the Threads_lock while
4909 // holding the Parker:: mutex. If safepoints are pending both the
4910 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4911 ThreadBlockInVM tbivm(jt);
4912
4913 // Don't wait if cannot get lock since interference arises from
4914 // unblocking. Also. check interrupt before trying wait
4915 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4916 return;
4917 }
4918
4919 int status;
4920 if (_counter > 0) { // no wait needed
4921 _counter = 0;
4922 status = pthread_mutex_unlock(_mutex);
4923 assert (status == 0, "invariant");
4924 OrderAccess::fence();
4925 return;
4926 }
4927
4928 #ifdef ASSERT
4929 // Don't catch signals while blocked; let the running threads have the signals.
4930 // (This allows a debugger to break into the running thread.)
4931 sigset_t oldsigs;
4932 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4933 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4934 #endif
4935
4936 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4937 jt->set_suspend_equivalent();
4938 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4939
4940 if (time == 0) {
4941 status = pthread_cond_wait (_cond, _mutex);
4942 } else {
4943 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4944 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4945 pthread_cond_destroy (_cond);
4946 pthread_cond_init (_cond, NULL);
4947 }
4948 }
4949 assert_status(status == 0 || status == EINTR ||
4950 status == ETIME || status == ETIMEDOUT,
4951 status, "cond_timedwait");
4952
4953 #ifdef ASSERT
4954 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4955 #endif
4956
4957 _counter = 0;
4958 status = pthread_mutex_unlock(_mutex);
4959 assert_status(status == 0, status, "invariant");
4960 // If externally suspended while waiting, re-suspend
4961 if (jt->handle_special_suspend_equivalent_condition()) {
4962 jt->java_suspend_self();
4963 }
4964
4965 OrderAccess::fence();
4966 }
4967
4968 void Parker::unpark() {
4969 int s, status;
4970 status = pthread_mutex_lock(_mutex);
4971 assert (status == 0, "invariant");
4972 s = _counter;
4973 _counter = 1;
4974 if (s < 1) {
4975 if (WorkAroundNPTLTimedWaitHang) {
4976 status = pthread_cond_signal (_cond);
4977 assert (status == 0, "invariant");
4978 status = pthread_mutex_unlock(_mutex);
4979 assert (status == 0, "invariant");
4980 } else {
4981 status = pthread_mutex_unlock(_mutex);
4982 assert (status == 0, "invariant");
4983 status = pthread_cond_signal (_cond);
4984 assert (status == 0, "invariant");
4985 }
4986 } else {
4987 pthread_mutex_unlock(_mutex);
4988 assert (status == 0, "invariant");
4989 }
4990 }
4991
4992
4993 extern char** environ;
4994
4995 // Run the specified command in a separate process. Return its exit value,
4996 // or -1 on failure (e.g. can't fork a new process).
4997 // Unlike system(), this function can be called from signal handler. It
4998 // doesn't block SIGINT et al.
4999 int os::fork_and_exec(char* cmd) {
5000 char * argv[4] = {"sh", "-c", cmd, NULL};
5001
5002 pid_t pid = fork();
5003
5004 if (pid < 0) {
5005 // fork failed
5006 return -1;
5007
5008 } else if (pid == 0) {
5009 // child process
5010
5011 // try to be consistent with system(), which uses "/usr/bin/sh" on AIX
5012 execve("/usr/bin/sh", argv, environ);
5013
5014 // execve failed
5015 _exit(-1);
5016
5017 } else {
5018 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5019 // care about the actual exit code, for now.
5020
5021 int status;
5022
5023 // Wait for the child process to exit. This returns immediately if
5024 // the child has already exited. */
5025 while (waitpid(pid, &status, 0) < 0) {
5026 switch (errno) {
5027 case ECHILD: return 0;
5028 case EINTR: break;
5029 default: return -1;
5030 }
5031 }
5032
5033 if (WIFEXITED(status)) {
5034 // The child exited normally; get its exit code.
5035 return WEXITSTATUS(status);
5036 } else if (WIFSIGNALED(status)) {
5037 // The child exited because of a signal
5038 // The best value to return is 0x80 + signal number,
5039 // because that is what all Unix shells do, and because
5040 // it allows callers to distinguish between process exit and
5041 // process death by signal.
5042 return 0x80 + WTERMSIG(status);
5043 } else {
5044 // Unknown exit code; pass it through
5045 return status;
5046 }
5047 }
5048 // Remove warning.
5049 return -1;
5050 }
5051
5052 // is_headless_jre()
5053 //
5054 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5055 // in order to report if we are running in a headless jre.
5056 //
5057 // Since JDK8 xawt/libmawt.so is moved into the same directory
5058 // as libawt.so, and renamed libawt_xawt.so
5059 bool os::is_headless_jre() {
5060 struct stat statbuf;
5061 char buf[MAXPATHLEN];
5062 char libmawtpath[MAXPATHLEN];
5063 const char *xawtstr = "/xawt/libmawt.so";
5064 const char *new_xawtstr = "/libawt_xawt.so";
5065
5066 char *p;
5067
5068 // Get path to libjvm.so
5069 os::jvm_path(buf, sizeof(buf));
5070
5071 // Get rid of libjvm.so
5072 p = strrchr(buf, '/');
5073 if (p == NULL) return false;
5074 else *p = '\0';
5075
5076 // Get rid of client or server
5077 p = strrchr(buf, '/');
5078 if (p == NULL) return false;
5079 else *p = '\0';
5080
5081 // check xawt/libmawt.so
5082 strcpy(libmawtpath, buf);
5083 strcat(libmawtpath, xawtstr);
5084 if (::stat(libmawtpath, &statbuf) == 0) return false;
5085
5086 // check libawt_xawt.so
5087 strcpy(libmawtpath, buf);
5088 strcat(libmawtpath, new_xawtstr);
5089 if (::stat(libmawtpath, &statbuf) == 0) return false;
5090
5091 return true;
5092 }
5093
5094 // Get the default path to the core file
5095 // Returns the length of the string
5096 int os::get_core_path(char* buffer, size_t bufferSize) {
5097 const char* p = get_current_directory(buffer, bufferSize);
5098
5099 if (p == NULL) {
5100 assert(p != NULL, "failed to get current directory");
5101 return 0;
5102 }
5103
5104 return strlen(buffer);
5105 }
5106
5107 #ifndef PRODUCT
5108 void TestReserveMemorySpecial_test() {
5109 // No tests available for this platform
5110 }
5111 #endif