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/osThread.hpp"
59 #include "runtime/perfMemory.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/statSampler.hpp"
62 #include "runtime/stubRoutines.hpp"
63 #include "runtime/threadCritical.hpp"
64 #include "runtime/thread.inline.hpp"
65 #include "runtime/timer.hpp"
66 #include "services/attachListener.hpp"
67 #include "services/runtimeService.hpp"
68 #include "utilities/decoder.hpp"
69 #include "utilities/defaultStream.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/growableArray.hpp"
72 #include "utilities/vmError.hpp"
73 #ifdef TARGET_ARCH_ppc
74 # include "assembler_ppc.inline.hpp"
75 # include "nativeInst_ppc.hpp"
76 #endif
77 #ifdef COMPILER1
78 #include "c1/c1_Runtime1.hpp"
79 #endif
80 #ifdef COMPILER2
81 #include "opto/runtime.hpp"
82 #endif
83
84 // put OS-includes here (sorted alphabetically)
85 #include <errno.h>
86 #include <fcntl.h>
87 #include <inttypes.h>
88 #include <poll.h>
89 #include <procinfo.h>
90 #include <pthread.h>
91 #include <pwd.h>
92 #include <semaphore.h>
93 #include <signal.h>
94 #include <stdint.h>
95 #include <stdio.h>
96 #include <string.h>
97 #include <unistd.h>
98 #include <sys/ioctl.h>
99 #include <sys/ipc.h>
100 #include <sys/mman.h>
101 #include <sys/resource.h>
102 #include <sys/select.h>
103 #include <sys/shm.h>
104 #include <sys/socket.h>
105 #include <sys/stat.h>
106 #include <sys/sysinfo.h>
107 #include <sys/systemcfg.h>
108 #include <sys/time.h>
109 #include <sys/times.h>
110 #include <sys/types.h>
111 #include <sys/utsname.h>
112 #include <sys/vminfo.h>
113 #include <sys/wait.h>
114
115 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
116 #if !defined(_AIXVERSION_610)
117 extern "C" {
118 int getthrds64(pid_t ProcessIdentifier,
119 struct thrdentry64* ThreadBuffer,
120 int ThreadSize,
121 tid64_t* IndexPointer,
122 int Count);
123 }
124 #endif
125
126 // Excerpts from systemcfg.h definitions newer than AIX 5.3
127 #ifndef PV_7
128 # define PV_7 0x200000 // Power PC 7
129 # define PV_7_Compat 0x208000 // Power PC 7
130 #endif
131
132 #define MAX_PATH (2 * K)
133
134 // for timer info max values which include all bits
135 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
136 // for multipage initialization error analysis (in 'g_multipage_error')
137 #define ERROR_MP_OS_TOO_OLD 100
138 #define ERROR_MP_EXTSHM_ACTIVE 101
139 #define ERROR_MP_VMGETINFO_FAILED 102
140 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
141
142 // the semantics in this file are thus that codeptr_t is a *real code ptr*
143 // This means that any function taking codeptr_t as arguments will assume
144 // a real codeptr and won't handle function descriptors (eg getFuncName),
145 // whereas functions taking address as args will deal with function
146 // descriptors (eg os::dll_address_to_library_name)
147 typedef unsigned int* codeptr_t;
148
149 // typedefs for stackslots, stack pointers, pointers to op codes
150 typedef unsigned long stackslot_t;
151 typedef stackslot_t* stackptr_t;
152
153 // query dimensions of the stack of the calling thread
154 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
155
156 // function to check a given stack pointer against given stack limits
157 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
158 if (((uintptr_t)sp) & 0x7) {
159 return false;
160 }
161 if (sp > stack_base) {
162 return false;
163 }
164 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
165 return false;
166 }
167 return true;
168 }
169
170 // returns true if function is a valid codepointer
171 inline bool is_valid_codepointer(codeptr_t p) {
172 if (!p) {
173 return false;
174 }
175 if (((uintptr_t)p) & 0x3) {
176 return false;
177 }
178 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
179 return false;
180 }
181 return true;
182 }
183
184 // macro to check a given stack pointer against given stack limits and to die if test fails
185 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
186 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
187 }
188
189 // macro to check the current stack pointer against given stacklimits
190 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
191 address sp; \
192 sp = os::current_stack_pointer(); \
193 CHECK_STACK_PTR(sp, stack_base, stack_size); \
194 }
195
196 ////////////////////////////////////////////////////////////////////////////////
197 // global variables (for a description see os_aix.hpp)
198
199 julong os::Aix::_physical_memory = 0;
200 pthread_t os::Aix::_main_thread = ((pthread_t)0);
201 int os::Aix::_page_size = -1;
202 int os::Aix::_on_pase = -1;
203 int os::Aix::_os_version = -1;
204 int os::Aix::_stack_page_size = -1;
205 size_t os::Aix::_shm_default_page_size = -1;
206 int os::Aix::_can_use_64K_pages = -1;
207 int os::Aix::_can_use_16M_pages = -1;
208 int os::Aix::_xpg_sus_mode = -1;
209 int os::Aix::_extshm = -1;
210 int os::Aix::_logical_cpus = -1;
211
212 ////////////////////////////////////////////////////////////////////////////////
213 // local variables
214
215 static int g_multipage_error = -1; // error analysis for multipage initialization
216 static jlong initial_time_count = 0;
217 static int clock_tics_per_sec = 100;
218 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
219 static bool check_signals = true;
220 static pid_t _initial_pid = 0;
221 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
222 static sigset_t SR_sigset;
223 static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls */
224
225 julong os::available_memory() {
226 return Aix::available_memory();
227 }
228
229 julong os::Aix::available_memory() {
230 os::Aix::meminfo_t mi;
231 if (os::Aix::get_meminfo(&mi)) {
232 return mi.real_free;
233 } else {
234 return 0xFFFFFFFFFFFFFFFFLL;
235 }
236 }
237
238 julong os::physical_memory() {
239 return Aix::physical_memory();
240 }
241
242 ////////////////////////////////////////////////////////////////////////////////
243 // environment support
244
245 bool os::getenv(const char* name, char* buf, int len) {
246 const char* val = ::getenv(name);
247 if (val != NULL && strlen(val) < (size_t)len) {
248 strcpy(buf, val);
249 return true;
250 }
251 if (len > 0) buf[0] = 0; // return a null string
252 return false;
253 }
254
255
256 // Return true if user is running as root.
257
258 bool os::have_special_privileges() {
259 static bool init = false;
260 static bool privileges = false;
261 if (!init) {
262 privileges = (getuid() != geteuid()) || (getgid() != getegid());
263 init = true;
264 }
265 return privileges;
266 }
267
268 // Helper function, emulates disclaim64 using multiple 32bit disclaims
269 // because we cannot use disclaim64() on AS/400 and old AIX releases.
270 static bool my_disclaim64(char* addr, size_t size) {
271
272 if (size == 0) {
273 return true;
274 }
275
276 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
277 const unsigned int maxDisclaimSize = 0x80000000;
278
279 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
280 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
281
282 char* p = addr;
283
284 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
285 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
286 //if (Verbose)
287 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
288 return false;
289 }
290 p += maxDisclaimSize;
291 }
292
293 if (lastDisclaimSize > 0) {
294 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
295 //if (Verbose)
296 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
297 return false;
298 }
299 }
300
301 return true;
302 }
303
304 // Cpu architecture string
305 #if defined(PPC32)
306 static char cpu_arch[] = "ppc";
307 #elif defined(PPC64)
308 static char cpu_arch[] = "ppc64";
309 #else
310 #error Add appropriate cpu_arch setting
311 #endif
312
313
314 // Given an address, returns the size of the page backing that address.
315 size_t os::Aix::query_pagesize(void* addr) {
316
317 vm_page_info pi;
318 pi.addr = (uint64_t)addr;
319 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
320 return pi.pagesize;
321 } else {
322 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
323 assert(false, "vmgetinfo failed to retrieve page size");
324 return SIZE_4K;
325 }
326
327 }
328
329 // Returns the kernel thread id of the currently running thread.
330 pid_t os::Aix::gettid() {
331 return (pid_t) thread_self();
332 }
333
334 void os::Aix::initialize_system_info() {
335
336 // get the number of online(logical) cpus instead of configured
337 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
338 assert(_processor_count > 0, "_processor_count must be > 0");
339
340 // retrieve total physical storage
341 os::Aix::meminfo_t mi;
342 if (!os::Aix::get_meminfo(&mi)) {
343 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
344 assert(false, "os::Aix::get_meminfo failed.");
345 }
346 _physical_memory = (julong) mi.real_total;
347 }
348
349 // Helper function for tracing page sizes.
350 static const char* describe_pagesize(size_t pagesize) {
351 switch (pagesize) {
352 case SIZE_4K : return "4K";
353 case SIZE_64K: return "64K";
354 case SIZE_16M: return "16M";
355 case SIZE_16G: return "16G";
356 default:
357 assert(false, "surprise");
358 return "??";
359 }
360 }
361
362 // Retrieve information about multipage size support. Will initialize
363 // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages,
364 // Aix::_can_use_16M_pages.
365 // Must be called before calling os::large_page_init().
366 void os::Aix::query_multipage_support() {
367
368 guarantee(_page_size == -1 &&
369 _stack_page_size == -1 &&
370 _can_use_64K_pages == -1 &&
371 _can_use_16M_pages == -1 &&
372 g_multipage_error == -1,
373 "do not call twice");
374
375 _page_size = ::sysconf(_SC_PAGESIZE);
376
377 // This really would surprise me.
378 assert(_page_size == SIZE_4K, "surprise!");
379
380
381 // query default data page size (default page size for C-Heap, pthread stacks and .bss).
382 // Default data page size is influenced either by linker options (-bdatapsize)
383 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
384 // default should be 4K.
385 size_t data_page_size = SIZE_4K;
386 {
387 void* p = ::malloc(SIZE_16M);
388 data_page_size = os::Aix::query_pagesize(p);
389 ::free(p);
390 }
391
392 // query default shm page size (LDR_CNTRL SHMPSIZE)
393 {
394 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
395 guarantee(shmid != -1, "shmget failed");
396 void* p = ::shmat(shmid, NULL, 0);
397 ::shmctl(shmid, IPC_RMID, NULL);
398 guarantee(p != (void*) -1, "shmat failed");
399 _shm_default_page_size = os::Aix::query_pagesize(p);
400 ::shmdt(p);
401 }
402
403 // before querying the stack page size, make sure we are not running as primordial
404 // thread (because primordial thread's stack may have different page size than
405 // pthread thread stacks). Running a VM on the primordial thread won't work for a
406 // number of reasons so we may just as well guarantee it here
407 guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread");
408
409 // query stack page size
410 {
411 int dummy = 0;
412 _stack_page_size = os::Aix::query_pagesize(&dummy);
413 // everything else would surprise me and should be looked into
414 guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size");
415 // also, just for completeness: pthread stacks are allocated from C heap, so
416 // stack page size should be the same as data page size
417 guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size");
418 }
419
420 // EXTSHM is bad: among other things, it prevents setting pagesize dynamically
421 // for system V shm.
422 if (Aix::extshm()) {
423 if (Verbose) {
424 fprintf(stderr, "EXTSHM is active - will disable large page support.\n"
425 "Please make sure EXTSHM is OFF for large page support.\n");
426 }
427 g_multipage_error = ERROR_MP_EXTSHM_ACTIVE;
428 _can_use_64K_pages = _can_use_16M_pages = 0;
429 goto query_multipage_support_end;
430 }
431
432 // now check which page sizes the OS claims it supports, and of those, which actually can be used.
433 {
434 const int MAX_PAGE_SIZES = 4;
435 psize_t sizes[MAX_PAGE_SIZES];
436 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
437 if (num_psizes == -1) {
438 if (Verbose) {
439 fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
440 fprintf(stderr, "disabling multipage support.\n");
441 }
442 g_multipage_error = ERROR_MP_VMGETINFO_FAILED;
443 _can_use_64K_pages = _can_use_16M_pages = 0;
444 goto query_multipage_support_end;
445 }
446 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
447 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
448 if (Verbose) {
449 fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
450 for (int i = 0; i < num_psizes; i ++) {
451 fprintf(stderr, " %s ", describe_pagesize(sizes[i]));
452 }
453 fprintf(stderr, " .\n");
454 }
455
456 // Can we use 64K, 16M pages?
457 _can_use_64K_pages = 0;
458 _can_use_16M_pages = 0;
459 for (int i = 0; i < num_psizes; i ++) {
460 if (sizes[i] == SIZE_64K) {
461 _can_use_64K_pages = 1;
462 } else if (sizes[i] == SIZE_16M) {
463 _can_use_16M_pages = 1;
464 }
465 }
466
467 if (!_can_use_64K_pages) {
468 g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K;
469 }
470
471 // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages,
472 // there must be an actual 16M page pool, and we must run with enough rights.
473 if (_can_use_16M_pages) {
474 const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR);
475 guarantee(shmid != -1, "shmget failed");
476 struct shmid_ds shm_buf = { 0 };
477 shm_buf.shm_pagesize = SIZE_16M;
478 const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false;
479 const int en = errno;
480 ::shmctl(shmid, IPC_RMID, NULL);
481 if (!can_set_pagesize) {
482 if (Verbose) {
483 fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n"
484 "Will deactivate 16M support.\n", en, strerror(en));
485 }
486 _can_use_16M_pages = 0;
487 }
488 }
489
490 } // end: check which pages can be used for shared memory
491
492 query_multipage_support_end:
493
494 guarantee(_page_size != -1 &&
495 _stack_page_size != -1 &&
496 _can_use_64K_pages != -1 &&
497 _can_use_16M_pages != -1, "Page sizes not properly initialized");
498
499 if (_can_use_64K_pages) {
500 g_multipage_error = 0;
501 }
502
503 if (Verbose) {
504 fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size));
505 fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size));
506 fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size));
507 fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no"));
508 fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no"));
509 fprintf(stderr, "Multipage error details: %d\n", g_multipage_error);
510 }
511
512 } // end os::Aix::query_multipage_support()
513
514
515 // The code for this method was initially derived from the version in os_linux.cpp
516 void os::init_system_properties_values() {
517 // The next few definitions allow the code to be verbatim:
518 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
519 #define DEFAULT_LIBPATH "/usr/lib:/lib"
520 #define EXTENSIONS_DIR "/lib/ext"
521 #define ENDORSED_DIR "/lib/endorsed"
522
523 // sysclasspath, java_home, dll_dir
524 char *home_path;
525 char *dll_path;
526 char *pslash;
527 char buf[MAXPATHLEN];
528 os::jvm_path(buf, sizeof(buf));
529
530 // Found the full path to libjvm.so.
531 // Now cut the path to <java_home>/jre if we can.
532 *(strrchr(buf, '/')) = '\0'; // get rid of /libjvm.so
533 pslash = strrchr(buf, '/');
534 if (pslash != NULL) {
535 *pslash = '\0'; // get rid of /{client|server|hotspot}
536 }
537
538 dll_path = malloc(strlen(buf) + 1);
539 strcpy(dll_path, buf);
540 Arguments::set_dll_dir(dll_path);
541
542 if (pslash != NULL) {
543 pslash = strrchr(buf, '/');
544 if (pslash != NULL) {
545 *pslash = '\0'; // get rid of /<arch>
546 pslash = strrchr(buf, '/');
547 if (pslash != NULL) {
548 *pslash = '\0'; // get rid of /lib
549 }
550 }
551 }
552
553 home_path = malloc(strlen(buf) + 1);
554 strcpy(home_path, buf);
555 Arguments::set_java_home(home_path);
556
557 if (!set_boot_path('/', ':')) return;
558
559 // Where to look for native libraries
560
561 // On Aix we get the user setting of LIBPATH
562 // Eventually, all the library path setting will be done here.
563 char *ld_library_path;
564
565 // Construct the invariant part of ld_library_path.
566 ld_library_path = (char *) malloc(sizeof(DEFAULT_LIBPATH));
567 sprintf(ld_library_path, DEFAULT_LIBPATH);
568
569 // Get the user setting of LIBPATH, and prepended it.
570 char *v = ::getenv("LIBPATH");
571 if (v == NULL) {
572 v = "";
573 }
574
575 char *t = ld_library_path;
576 // That's +1 for the colon and +1 for the trailing '\0'
577 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
578 sprintf(ld_library_path, "%s:%s", v, t);
579
580 Arguments::set_library_path(ld_library_path);
581
582 // Extensions directories
583 char* cbuf = malloc(strlen(Arguments::get_java_home()) + sizeof(EXTENSIONS_DIR));
584 sprintf(cbuf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
585 Arguments::set_ext_dirs(cbuf);
586
587 // Endorsed standards default directory.
588 cbuf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
589 sprintf(cbuf, "%s" ENDORSED_DIR, Arguments::get_java_home());
590 Arguments::set_endorsed_dirs(cbuf);
591
592 #undef malloc
593 #undef DEFAULT_LIBPATH
594 #undef EXTENSIONS_DIR
595 #undef ENDORSED_DIR
596 }
597
598 ////////////////////////////////////////////////////////////////////////////////
599 // breakpoint support
600
601 void os::breakpoint() {
602 BREAKPOINT;
603 }
604
605 extern "C" void breakpoint() {
606 // use debugger to set breakpoint here
607 }
608
609 ////////////////////////////////////////////////////////////////////////////////
610 // signal support
611
612 debug_only(static bool signal_sets_initialized = false);
613 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
614
615 bool os::Aix::is_sig_ignored(int sig) {
616 struct sigaction oact;
617 sigaction(sig, (struct sigaction*)NULL, &oact);
618 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
619 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
620 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
621 return true;
622 else
623 return false;
624 }
625
626 void os::Aix::signal_sets_init() {
627 // Should also have an assertion stating we are still single-threaded.
628 assert(!signal_sets_initialized, "Already initialized");
629 // Fill in signals that are necessarily unblocked for all threads in
630 // the VM. Currently, we unblock the following signals:
631 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
632 // by -Xrs (=ReduceSignalUsage));
633 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
634 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
635 // the dispositions or masks wrt these signals.
636 // Programs embedding the VM that want to use the above signals for their
637 // own purposes must, at this time, use the "-Xrs" option to prevent
638 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
639 // (See bug 4345157, and other related bugs).
640 // In reality, though, unblocking these signals is really a nop, since
641 // these signals are not blocked by default.
642 sigemptyset(&unblocked_sigs);
643 sigemptyset(&allowdebug_blocked_sigs);
644 sigaddset(&unblocked_sigs, SIGILL);
645 sigaddset(&unblocked_sigs, SIGSEGV);
646 sigaddset(&unblocked_sigs, SIGBUS);
647 sigaddset(&unblocked_sigs, SIGFPE);
648 sigaddset(&unblocked_sigs, SIGTRAP);
649 sigaddset(&unblocked_sigs, SIGDANGER);
650 sigaddset(&unblocked_sigs, SR_signum);
651
652 if (!ReduceSignalUsage) {
653 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
654 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
655 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
656 }
657 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
658 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
659 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
660 }
661 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
662 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
663 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
664 }
665 }
666 // Fill in signals that are blocked by all but the VM thread.
667 sigemptyset(&vm_sigs);
668 if (!ReduceSignalUsage)
669 sigaddset(&vm_sigs, BREAK_SIGNAL);
670 debug_only(signal_sets_initialized = true);
671 }
672
673 // These are signals that are unblocked while a thread is running Java.
674 // (For some reason, they get blocked by default.)
675 sigset_t* os::Aix::unblocked_signals() {
676 assert(signal_sets_initialized, "Not initialized");
677 return &unblocked_sigs;
678 }
679
680 // These are the signals that are blocked while a (non-VM) thread is
681 // running Java. Only the VM thread handles these signals.
682 sigset_t* os::Aix::vm_signals() {
683 assert(signal_sets_initialized, "Not initialized");
684 return &vm_sigs;
685 }
686
687 // These are signals that are blocked during cond_wait to allow debugger in
688 sigset_t* os::Aix::allowdebug_blocked_signals() {
689 assert(signal_sets_initialized, "Not initialized");
690 return &allowdebug_blocked_sigs;
691 }
692
693 void os::Aix::hotspot_sigmask(Thread* thread) {
694
695 //Save caller's signal mask before setting VM signal mask
696 sigset_t caller_sigmask;
697 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
698
699 OSThread* osthread = thread->osthread();
700 osthread->set_caller_sigmask(caller_sigmask);
701
702 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
703
704 if (!ReduceSignalUsage) {
705 if (thread->is_VM_thread()) {
706 // Only the VM thread handles BREAK_SIGNAL ...
707 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
708 } else {
709 // ... all other threads block BREAK_SIGNAL
710 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
711 }
712 }
713 }
714
715 // retrieve memory information.
716 // Returns false if something went wrong;
717 // content of pmi undefined in this case.
718 bool os::Aix::get_meminfo(meminfo_t* pmi) {
719
720 assert(pmi, "get_meminfo: invalid parameter");
721
722 memset(pmi, 0, sizeof(meminfo_t));
723
724 if (os::Aix::on_pase()) {
725
726 Unimplemented();
727 return false;
728
729 } else {
730
731 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
732 // See:
733 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
734 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
735 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
736 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
737
738 perfstat_memory_total_t psmt;
739 memset (&psmt, '\0', sizeof(psmt));
740 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
741 if (rc == -1) {
742 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
743 assert(0, "perfstat_memory_total() failed");
744 return false;
745 }
746
747 assert(rc == 1, "perfstat_memory_total() - weird return code");
748
749 // excerpt from
750 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
751 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
752 // The fields of perfstat_memory_total_t:
753 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
754 // u_longlong_t real_total Total real memory (in 4 KB pages).
755 // u_longlong_t real_free Free real memory (in 4 KB pages).
756 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
757 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
758
759 pmi->virt_total = psmt.virt_total * 4096;
760 pmi->real_total = psmt.real_total * 4096;
761 pmi->real_free = psmt.real_free * 4096;
762 pmi->pgsp_total = psmt.pgsp_total * 4096;
763 pmi->pgsp_free = psmt.pgsp_free * 4096;
764
765 return true;
766
767 }
768 } // end os::Aix::get_meminfo
769
770 // Retrieve global cpu information.
771 // Returns false if something went wrong;
772 // the content of pci is undefined in this case.
773 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
774 assert(pci, "get_cpuinfo: invalid parameter");
775 memset(pci, 0, sizeof(cpuinfo_t));
776
777 perfstat_cpu_total_t psct;
778 memset (&psct, '\0', sizeof(psct));
779
780 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
781 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
782 assert(0, "perfstat_cpu_total() failed");
783 return false;
784 }
785
786 // global cpu information
787 strcpy (pci->description, psct.description);
788 pci->processorHZ = psct.processorHZ;
789 pci->ncpus = psct.ncpus;
790 os::Aix::_logical_cpus = psct.ncpus;
791 for (int i = 0; i < 3; i++) {
792 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
793 }
794
795 // get the processor version from _system_configuration
796 switch (_system_configuration.version) {
797 case PV_7:
798 strcpy(pci->version, "Power PC 7");
799 break;
800 case PV_6_1:
801 strcpy(pci->version, "Power PC 6 DD1.x");
802 break;
803 case PV_6:
804 strcpy(pci->version, "Power PC 6");
805 break;
806 case PV_5:
807 strcpy(pci->version, "Power PC 5");
808 break;
809 case PV_5_2:
810 strcpy(pci->version, "Power PC 5_2");
811 break;
812 case PV_5_3:
813 strcpy(pci->version, "Power PC 5_3");
814 break;
815 case PV_5_Compat:
816 strcpy(pci->version, "PV_5_Compat");
817 break;
818 case PV_6_Compat:
819 strcpy(pci->version, "PV_6_Compat");
820 break;
821 case PV_7_Compat:
822 strcpy(pci->version, "PV_7_Compat");
823 break;
824 default:
825 strcpy(pci->version, "unknown");
826 }
827
828 return true;
829
830 } //end os::Aix::get_cpuinfo
831
832 //////////////////////////////////////////////////////////////////////////////
833 // detecting pthread library
834
835 void os::Aix::libpthread_init() {
836 return;
837 }
838
839 //////////////////////////////////////////////////////////////////////////////
840 // create new thread
841
842 // Thread start routine for all newly created threads
843 static void *java_start(Thread *thread) {
844
845 // find out my own stack dimensions
846 {
847 // actually, this should do exactly the same as thread->record_stack_base_and_size...
848 address base = 0;
849 size_t size = 0;
850 query_stack_dimensions(&base, &size);
851 thread->set_stack_base(base);
852 thread->set_stack_size(size);
853 }
854
855 // Do some sanity checks.
856 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
857
858 // Try to randomize the cache line index of hot stack frames.
859 // This helps when threads of the same stack traces evict each other's
860 // cache lines. The threads can be either from the same JVM instance, or
861 // from different JVM instances. The benefit is especially true for
862 // processors with hyperthreading technology.
863
864 static int counter = 0;
865 int pid = os::current_process_id();
866 alloca(((pid ^ counter++) & 7) * 128);
867
868 ThreadLocalStorage::set_thread(thread);
869
870 OSThread* osthread = thread->osthread();
871
872 // thread_id is kernel thread id (similar to Solaris LWP id)
873 osthread->set_thread_id(os::Aix::gettid());
874
875 // initialize signal mask for this thread
876 os::Aix::hotspot_sigmask(thread);
877
878 // initialize floating point control register
879 os::Aix::init_thread_fpu_state();
880
881 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
882
883 // call one more level start routine
884 thread->run();
885
886 return 0;
887 }
888
889 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
890
891 // We want the whole function to be synchronized.
892 ThreadCritical cs;
893
894 assert(thread->osthread() == NULL, "caller responsible");
895
896 // Allocate the OSThread object
897 OSThread* osthread = new OSThread(NULL, NULL);
898 if (osthread == NULL) {
899 return false;
900 }
901
902 // set the correct thread state
903 osthread->set_thread_type(thr_type);
904
905 // Initial state is ALLOCATED but not INITIALIZED
906 osthread->set_state(ALLOCATED);
907
908 thread->set_osthread(osthread);
909
910 // init thread attributes
911 pthread_attr_t attr;
912 pthread_attr_init(&attr);
913 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
914
915 // Make sure we run in 1:1 kernel-user-thread mode.
916 if (os::Aix::on_aix()) {
917 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
918 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
919 } // end: aix
920
921 // Start in suspended state, and in os::thread_start, wake the thread up.
922 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
923
924 // calculate stack size if it's not specified by caller
925 if (os::Aix::supports_variable_stack_size()) {
926 if (stack_size == 0) {
927 stack_size = os::Aix::default_stack_size(thr_type);
928
929 switch (thr_type) {
930 case os::java_thread:
931 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
932 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
933 stack_size = JavaThread::stack_size_at_create();
934 break;
935 case os::compiler_thread:
936 if (CompilerThreadStackSize > 0) {
937 stack_size = (size_t)(CompilerThreadStackSize * K);
938 break;
939 } // else fall through:
940 // use VMThreadStackSize if CompilerThreadStackSize is not defined
941 case os::vm_thread:
942 case os::pgc_thread:
943 case os::cgc_thread:
944 case os::watcher_thread:
945 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
946 break;
947 }
948 }
949
950 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
951 pthread_attr_setstacksize(&attr, stack_size);
952 } //else let thread_create() pick the default value (96 K on AIX)
953
954 pthread_t tid;
955 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
956
957 pthread_attr_destroy(&attr);
958
959 if (ret != 0) {
960 if (PrintMiscellaneous && (Verbose || WizardMode)) {
961 perror("pthread_create()");
962 }
963 // Need to clean up stuff we've allocated so far
964 thread->set_osthread(NULL);
965 delete osthread;
966 return false;
967 }
968
969 // Store pthread info into the OSThread
970 osthread->set_pthread_id(tid);
971
972 return true;
973 }
974
975 /////////////////////////////////////////////////////////////////////////////
976 // attach existing thread
977
978 // bootstrap the main thread
979 bool os::create_main_thread(JavaThread* thread) {
980 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
981 return create_attached_thread(thread);
982 }
983
984 bool os::create_attached_thread(JavaThread* thread) {
985 #ifdef ASSERT
986 thread->verify_not_published();
987 #endif
988
989 // Allocate the OSThread object
990 OSThread* osthread = new OSThread(NULL, NULL);
991
992 if (osthread == NULL) {
993 return false;
994 }
995
996 // Store pthread info into the OSThread
997 osthread->set_thread_id(os::Aix::gettid());
998 osthread->set_pthread_id(::pthread_self());
999
1000 // initialize floating point control register
1001 os::Aix::init_thread_fpu_state();
1002
1003 // some sanity checks
1004 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
1005
1006 // Initial thread state is RUNNABLE
1007 osthread->set_state(RUNNABLE);
1008
1009 thread->set_osthread(osthread);
1010
1011 if (UseNUMA) {
1012 int lgrp_id = os::numa_get_group_id();
1013 if (lgrp_id != -1) {
1014 thread->set_lgrp_id(lgrp_id);
1015 }
1016 }
1017
1018 // initialize signal mask for this thread
1019 // and save the caller's signal mask
1020 os::Aix::hotspot_sigmask(thread);
1021
1022 return true;
1023 }
1024
1025 void os::pd_start_thread(Thread* thread) {
1026 int status = pthread_continue_np(thread->osthread()->pthread_id());
1027 assert(status == 0, "thr_continue failed");
1028 }
1029
1030 // Free OS resources related to the OSThread
1031 void os::free_thread(OSThread* osthread) {
1032 assert(osthread != NULL, "osthread not set");
1033
1034 if (Thread::current()->osthread() == osthread) {
1035 // Restore caller's signal mask
1036 sigset_t sigmask = osthread->caller_sigmask();
1037 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1038 }
1039
1040 delete osthread;
1041 }
1042
1043 //////////////////////////////////////////////////////////////////////////////
1044 // thread local storage
1045
1046 int os::allocate_thread_local_storage() {
1047 pthread_key_t key;
1048 int rslt = pthread_key_create(&key, NULL);
1049 assert(rslt == 0, "cannot allocate thread local storage");
1050 return (int)key;
1051 }
1052
1053 // Note: This is currently not used by VM, as we don't destroy TLS key
1054 // on VM exit.
1055 void os::free_thread_local_storage(int index) {
1056 int rslt = pthread_key_delete((pthread_key_t)index);
1057 assert(rslt == 0, "invalid index");
1058 }
1059
1060 void os::thread_local_storage_at_put(int index, void* value) {
1061 int rslt = pthread_setspecific((pthread_key_t)index, value);
1062 assert(rslt == 0, "pthread_setspecific failed");
1063 }
1064
1065 extern "C" Thread* get_thread() {
1066 return ThreadLocalStorage::thread();
1067 }
1068
1069 ////////////////////////////////////////////////////////////////////////////////
1070 // time support
1071
1072 // Time since start-up in seconds to a fine granularity.
1073 // Used by VMSelfDestructTimer and the MemProfiler.
1074 double os::elapsedTime() {
1075 return (double)(os::elapsed_counter()) * 0.000001;
1076 }
1077
1078 jlong os::elapsed_counter() {
1079 timeval time;
1080 int status = gettimeofday(&time, NULL);
1081 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1082 }
1083
1084 jlong os::elapsed_frequency() {
1085 return (1000 * 1000);
1086 }
1087
1088 // For now, we say that linux does not support vtime. I have no idea
1089 // whether it can actually be made to (DLD, 9/13/05).
1090
1091 bool os::supports_vtime() { return false; }
1092 bool os::enable_vtime() { return false; }
1093 bool os::vtime_enabled() { return false; }
1094 double os::elapsedVTime() {
1095 // better than nothing, but not much
1096 return elapsedTime();
1097 }
1098
1099 jlong os::javaTimeMillis() {
1100 timeval time;
1101 int status = gettimeofday(&time, NULL);
1102 assert(status != -1, "aix error at gettimeofday()");
1103 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1104 }
1105
1106 // We need to manually declare mread_real_time,
1107 // because IBM didn't provide a prototype in time.h.
1108 // (they probably only ever tested in C, not C++)
1109 extern "C"
1110 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1111
1112 jlong os::javaTimeNanos() {
1113 if (os::Aix::on_pase()) {
1114 Unimplemented();
1115 return 0;
1116 }
1117 else {
1118 // On AIX use the precision of processors real time clock
1119 // or time base registers.
1120 timebasestruct_t time;
1121 int rc;
1122
1123 // If the CPU has a time register, it will be used and
1124 // we have to convert to real time first. After convertion we have following data:
1125 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1126 // time.tb_low [nanoseconds after the last full second above]
1127 // We better use mread_real_time here instead of read_real_time
1128 // to ensure that we will get a monotonic increasing time.
1129 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1130 rc = time_base_to_time(&time, TIMEBASE_SZ);
1131 assert(rc != -1, "aix error at time_base_to_time()");
1132 }
1133 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1134 }
1135 }
1136
1137 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1138 info_ptr->max_value = ALL_64_BITS;
1139 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1140 info_ptr->may_skip_backward = false;
1141 info_ptr->may_skip_forward = false;
1142 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1143 }
1144
1145 // Return the real, user, and system times in seconds from an
1146 // arbitrary fixed point in the past.
1147 bool os::getTimesSecs(double* process_real_time,
1148 double* process_user_time,
1149 double* process_system_time) {
1150 struct tms ticks;
1151 clock_t real_ticks = times(&ticks);
1152
1153 if (real_ticks == (clock_t) (-1)) {
1154 return false;
1155 } else {
1156 double ticks_per_second = (double) clock_tics_per_sec;
1157 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1158 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1159 *process_real_time = ((double) real_ticks) / ticks_per_second;
1160
1161 return true;
1162 }
1163 }
1164
1165
1166 char * os::local_time_string(char *buf, size_t buflen) {
1167 struct tm t;
1168 time_t long_time;
1169 time(&long_time);
1170 localtime_r(&long_time, &t);
1171 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1172 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1173 t.tm_hour, t.tm_min, t.tm_sec);
1174 return buf;
1175 }
1176
1177 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1178 return localtime_r(clock, res);
1179 }
1180
1181 ////////////////////////////////////////////////////////////////////////////////
1182 // runtime exit support
1183
1184 // Note: os::shutdown() might be called very early during initialization, or
1185 // called from signal handler. Before adding something to os::shutdown(), make
1186 // sure it is async-safe and can handle partially initialized VM.
1187 void os::shutdown() {
1188
1189 // allow PerfMemory to attempt cleanup of any persistent resources
1190 perfMemory_exit();
1191
1192 // needs to remove object in file system
1193 AttachListener::abort();
1194
1195 // flush buffered output, finish log files
1196 ostream_abort();
1197
1198 // Check for abort hook
1199 abort_hook_t abort_hook = Arguments::abort_hook();
1200 if (abort_hook != NULL) {
1201 abort_hook();
1202 }
1203
1204 }
1205
1206 // Note: os::abort() might be called very early during initialization, or
1207 // called from signal handler. Before adding something to os::abort(), make
1208 // sure it is async-safe and can handle partially initialized VM.
1209 void os::abort(bool dump_core) {
1210 os::shutdown();
1211 if (dump_core) {
1212 #ifndef PRODUCT
1213 fdStream out(defaultStream::output_fd());
1214 out.print_raw("Current thread is ");
1215 char buf[16];
1216 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1217 out.print_raw_cr(buf);
1218 out.print_raw_cr("Dumping core ...");
1219 #endif
1220 ::abort(); // dump core
1221 }
1222
1223 ::exit(1);
1224 }
1225
1226 // Die immediately, no exit hook, no abort hook, no cleanup.
1227 void os::die() {
1228 ::abort();
1229 }
1230
1231 // Unused on Aix for now.
1232 void os::set_error_file(const char *logfile) {}
1233
1234
1235 // This method is a copy of JDK's sysGetLastErrorString
1236 // from src/solaris/hpi/src/system_md.c
1237
1238 size_t os::lasterror(char *buf, size_t len) {
1239
1240 if (errno == 0) return 0;
1241
1242 const char *s = ::strerror(errno);
1243 size_t n = ::strlen(s);
1244 if (n >= len) {
1245 n = len - 1;
1246 }
1247 ::strncpy(buf, s, n);
1248 buf[n] = '\0';
1249 return n;
1250 }
1251
1252 intx os::current_thread_id() { return (intx)pthread_self(); }
1253 int os::current_process_id() {
1254
1255 // This implementation returns a unique pid, the pid of the
1256 // launcher thread that starts the vm 'process'.
1257
1258 // Under POSIX, getpid() returns the same pid as the
1259 // launcher thread rather than a unique pid per thread.
1260 // Use gettid() if you want the old pre NPTL behaviour.
1261
1262 // if you are looking for the result of a call to getpid() that
1263 // returns a unique pid for the calling thread, then look at the
1264 // OSThread::thread_id() method in osThread_linux.hpp file
1265
1266 return (int)(_initial_pid ? _initial_pid : getpid());
1267 }
1268
1269 // DLL functions
1270
1271 const char* os::dll_file_extension() { return ".so"; }
1272
1273 // This must be hard coded because it's the system's temporary
1274 // directory not the java application's temp directory, ala java.io.tmpdir.
1275 const char* os::get_temp_directory() { return "/tmp"; }
1276
1277 static bool file_exists(const char* filename) {
1278 struct stat statbuf;
1279 if (filename == NULL || strlen(filename) == 0) {
1280 return false;
1281 }
1282 return os::stat(filename, &statbuf) == 0;
1283 }
1284
1285 bool os::dll_build_name(char* buffer, size_t buflen,
1286 const char* pname, const char* fname) {
1287 bool retval = false;
1288 // Copied from libhpi
1289 const size_t pnamelen = pname ? strlen(pname) : 0;
1290
1291 // Return error on buffer overflow.
1292 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1293 *buffer = '\0';
1294 return retval;
1295 }
1296
1297 if (pnamelen == 0) {
1298 snprintf(buffer, buflen, "lib%s.so", fname);
1299 retval = true;
1300 } else if (strchr(pname, *os::path_separator()) != NULL) {
1301 int n;
1302 char** pelements = split_path(pname, &n);
1303 for (int i = 0; i < n; i++) {
1304 // Really shouldn't be NULL, but check can't hurt
1305 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1306 continue; // skip the empty path values
1307 }
1308 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1309 if (file_exists(buffer)) {
1310 retval = true;
1311 break;
1312 }
1313 }
1314 // release the storage
1315 for (int i = 0; i < n; i++) {
1316 if (pelements[i] != NULL) {
1317 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1318 }
1319 }
1320 if (pelements != NULL) {
1321 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1322 }
1323 } else {
1324 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1325 retval = true;
1326 }
1327 return retval;
1328 }
1329
1330 // Check if addr is inside libjvm.so.
1331 bool os::address_is_in_vm(address addr) {
1332
1333 // Input could be a real pc or a function pointer literal. The latter
1334 // would be a function descriptor residing in the data segment of a module.
1335
1336 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1337 if (lib) {
1338 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1339 return true;
1340 } else {
1341 return false;
1342 }
1343 } else {
1344 lib = LoadedLibraries::find_for_data_address(addr);
1345 if (lib) {
1346 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1347 return true;
1348 } else {
1349 return false;
1350 }
1351 } else {
1352 return false;
1353 }
1354 }
1355 }
1356
1357 // Resolve an AIX function descriptor literal to a code pointer.
1358 // If the input is a valid code pointer to a text segment of a loaded module,
1359 // it is returned unchanged.
1360 // If the input is a valid AIX function descriptor, it is resolved to the
1361 // code entry point.
1362 // If the input is neither a valid function descriptor nor a valid code pointer,
1363 // NULL is returned.
1364 static address resolve_function_descriptor_to_code_pointer(address p) {
1365
1366 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1367 if (lib) {
1368 // its a real code pointer
1369 return p;
1370 } else {
1371 lib = LoadedLibraries::find_for_data_address(p);
1372 if (lib) {
1373 // pointer to data segment, potential function descriptor
1374 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1375 if (LoadedLibraries::find_for_text_address(code_entry)) {
1376 // Its a function descriptor
1377 return code_entry;
1378 }
1379 }
1380 }
1381 return NULL;
1382 }
1383
1384 bool os::dll_address_to_function_name(address addr, char *buf,
1385 int buflen, int *offset) {
1386 if (offset) {
1387 *offset = -1;
1388 }
1389 if (buf) {
1390 buf[0] = '\0';
1391 }
1392
1393 // Resolve function ptr literals first.
1394 addr = resolve_function_descriptor_to_code_pointer(addr);
1395 if (!addr) {
1396 return false;
1397 }
1398
1399 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1400 return Decoder::decode(addr, buf, buflen, offset);
1401 }
1402
1403 static int getModuleName(codeptr_t pc, // [in] program counter
1404 char* p_name, size_t namelen, // [out] optional: function name
1405 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1406 ) {
1407
1408 // initialize output parameters
1409 if (p_name && namelen > 0) {
1410 *p_name = '\0';
1411 }
1412 if (p_errmsg && errmsglen > 0) {
1413 *p_errmsg = '\0';
1414 }
1415
1416 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1417 if (lib) {
1418 if (p_name && namelen > 0) {
1419 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1420 }
1421 return 0;
1422 }
1423
1424 if (Verbose) {
1425 fprintf(stderr, "pc outside any module");
1426 }
1427
1428 return -1;
1429
1430 }
1431
1432 bool os::dll_address_to_library_name(address addr, char* buf,
1433 int buflen, int* offset) {
1434 if (offset) {
1435 *offset = -1;
1436 }
1437 if (buf) {
1438 buf[0] = '\0';
1439 }
1440
1441 // Resolve function ptr literals first.
1442 addr = resolve_function_descriptor_to_code_pointer(addr);
1443 if (!addr) {
1444 return false;
1445 }
1446
1447 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1448 return true;
1449 }
1450 return false;
1451 }
1452
1453 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1454 // for the same architecture as Hotspot is running on
1455 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1456
1457 if (ebuf && ebuflen > 0) {
1458 ebuf[0] = '\0';
1459 ebuf[ebuflen - 1] = '\0';
1460 }
1461
1462 if (!filename || strlen(filename) == 0) {
1463 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1464 return NULL;
1465 }
1466
1467 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1468 void * result= ::dlopen(filename, RTLD_LAZY);
1469 if (result != NULL) {
1470 // Reload dll cache. Don't do this in signal handling.
1471 LoadedLibraries::reload();
1472 return result;
1473 } else {
1474 // error analysis when dlopen fails
1475 const char* const error_report = ::dlerror();
1476 if (error_report && ebuf && ebuflen > 0) {
1477 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1478 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1479 }
1480 }
1481 return NULL;
1482 }
1483
1484 // Glibc-2.0 libdl is not MT safe. If you are building with any glibc,
1485 // chances are you might want to run the generated bits against glibc-2.0
1486 // libdl.so, so always use locking for any version of glibc.
1487 void* os::dll_lookup(void* handle, const char* name) {
1488 pthread_mutex_lock(&dl_mutex);
1489 void* res = dlsym(handle, name);
1490 pthread_mutex_unlock(&dl_mutex);
1491 return res;
1492 }
1493
1494 void* os::get_default_process_handle() {
1495 return (void*)::dlopen(NULL, RTLD_LAZY);
1496 }
1497
1498 void os::print_dll_info(outputStream *st) {
1499 st->print_cr("Dynamic libraries:");
1500 LoadedLibraries::print(st);
1501 }
1502
1503 void os::print_os_info(outputStream* st) {
1504 st->print("OS:");
1505
1506 st->print("uname:");
1507 struct utsname name;
1508 uname(&name);
1509 st->print(name.sysname); st->print(" ");
1510 st->print(name.nodename); st->print(" ");
1511 st->print(name.release); st->print(" ");
1512 st->print(name.version); st->print(" ");
1513 st->print(name.machine);
1514 st->cr();
1515
1516 // rlimit
1517 st->print("rlimit:");
1518 struct rlimit rlim;
1519
1520 st->print(" STACK ");
1521 getrlimit(RLIMIT_STACK, &rlim);
1522 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1523 else st->print("%uk", rlim.rlim_cur >> 10);
1524
1525 st->print(", CORE ");
1526 getrlimit(RLIMIT_CORE, &rlim);
1527 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1528 else st->print("%uk", rlim.rlim_cur >> 10);
1529
1530 st->print(", NPROC ");
1531 st->print("%d", sysconf(_SC_CHILD_MAX));
1532
1533 st->print(", NOFILE ");
1534 getrlimit(RLIMIT_NOFILE, &rlim);
1535 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1536 else st->print("%d", rlim.rlim_cur);
1537
1538 st->print(", AS ");
1539 getrlimit(RLIMIT_AS, &rlim);
1540 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1541 else st->print("%uk", rlim.rlim_cur >> 10);
1542
1543 // Print limits on DATA, because it limits the C-heap.
1544 st->print(", DATA ");
1545 getrlimit(RLIMIT_DATA, &rlim);
1546 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1547 else st->print("%uk", rlim.rlim_cur >> 10);
1548 st->cr();
1549
1550 // load average
1551 st->print("load average:");
1552 double loadavg[3] = {-1.L, -1.L, -1.L};
1553 os::loadavg(loadavg, 3);
1554 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1555 st->cr();
1556 }
1557
1558 void os::print_memory_info(outputStream* st) {
1559
1560 st->print_cr("Memory:");
1561
1562 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1563 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1564 st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size()));
1565 st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no"));
1566 st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no"));
1567 if (g_multipage_error != 0) {
1568 st->print_cr(" multipage error: %d", g_multipage_error);
1569 }
1570
1571 // print out LDR_CNTRL because it affects the default page sizes
1572 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1573 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1574
1575 const char* const extshm = ::getenv("EXTSHM");
1576 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1577
1578 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1579 os::Aix::meminfo_t mi;
1580 if (os::Aix::get_meminfo(&mi)) {
1581 char buffer[256];
1582 if (os::Aix::on_aix()) {
1583 jio_snprintf(buffer, sizeof(buffer),
1584 " physical total : %llu\n"
1585 " physical free : %llu\n"
1586 " swap total : %llu\n"
1587 " swap free : %llu\n",
1588 mi.real_total,
1589 mi.real_free,
1590 mi.pgsp_total,
1591 mi.pgsp_free);
1592 } else {
1593 Unimplemented();
1594 }
1595 st->print_raw(buffer);
1596 } else {
1597 st->print_cr(" (no more information available)");
1598 }
1599 }
1600
1601 void os::pd_print_cpu_info(outputStream* st) {
1602 // cpu
1603 st->print("CPU:");
1604 st->print("total %d", os::processor_count());
1605 // It's not safe to query number of active processors after crash
1606 // st->print("(active %d)", os::active_processor_count());
1607 st->print(" %s", VM_Version::cpu_features());
1608 st->cr();
1609 }
1610
1611 void os::print_siginfo(outputStream* st, void* siginfo) {
1612 // Use common posix version.
1613 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1614 st->cr();
1615 }
1616
1617
1618 static void print_signal_handler(outputStream* st, int sig,
1619 char* buf, size_t buflen);
1620
1621 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1622 st->print_cr("Signal Handlers:");
1623 print_signal_handler(st, SIGSEGV, buf, buflen);
1624 print_signal_handler(st, SIGBUS , buf, buflen);
1625 print_signal_handler(st, SIGFPE , buf, buflen);
1626 print_signal_handler(st, SIGPIPE, buf, buflen);
1627 print_signal_handler(st, SIGXFSZ, buf, buflen);
1628 print_signal_handler(st, SIGILL , buf, buflen);
1629 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1630 print_signal_handler(st, SR_signum, buf, buflen);
1631 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1632 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1633 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1634 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1635 print_signal_handler(st, SIGTRAP, buf, buflen);
1636 print_signal_handler(st, SIGDANGER, buf, buflen);
1637 }
1638
1639 static char saved_jvm_path[MAXPATHLEN] = {0};
1640
1641 // Find the full path to the current module, libjvm.so or libjvm_g.so
1642 void os::jvm_path(char *buf, jint buflen) {
1643 // Error checking.
1644 if (buflen < MAXPATHLEN) {
1645 assert(false, "must use a large-enough buffer");
1646 buf[0] = '\0';
1647 return;
1648 }
1649 // Lazy resolve the path to current module.
1650 if (saved_jvm_path[0] != 0) {
1651 strcpy(buf, saved_jvm_path);
1652 return;
1653 }
1654
1655 Dl_info dlinfo;
1656 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1657 assert(ret != 0, "cannot locate libjvm");
1658 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1659 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1660
1661 strcpy(saved_jvm_path, buf);
1662 }
1663
1664 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1665 // no prefix required, not even "_"
1666 }
1667
1668 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1669 // no suffix required
1670 }
1671
1672 ////////////////////////////////////////////////////////////////////////////////
1673 // sun.misc.Signal support
1674
1675 static volatile jint sigint_count = 0;
1676
1677 static void
1678 UserHandler(int sig, void *siginfo, void *context) {
1679 // 4511530 - sem_post is serialized and handled by the manager thread. When
1680 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1681 // don't want to flood the manager thread with sem_post requests.
1682 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1683 return;
1684
1685 // Ctrl-C is pressed during error reporting, likely because the error
1686 // handler fails to abort. Let VM die immediately.
1687 if (sig == SIGINT && is_error_reported()) {
1688 os::die();
1689 }
1690
1691 os::signal_notify(sig);
1692 }
1693
1694 void* os::user_handler() {
1695 return CAST_FROM_FN_PTR(void*, UserHandler);
1696 }
1697
1698 extern "C" {
1699 typedef void (*sa_handler_t)(int);
1700 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1701 }
1702
1703 void* os::signal(int signal_number, void* handler) {
1704 struct sigaction sigAct, oldSigAct;
1705
1706 sigfillset(&(sigAct.sa_mask));
1707
1708 // Do not block out synchronous signals in the signal handler.
1709 // Blocking synchronous signals only makes sense if you can really
1710 // be sure that those signals won't happen during signal handling,
1711 // when the blocking applies. Normal signal handlers are lean and
1712 // do not cause signals. But our signal handlers tend to be "risky"
1713 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1714 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1715 // by a SIGILL, which was blocked due to the signal mask. The process
1716 // just hung forever. Better to crash from a secondary signal than to hang.
1717 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1718 sigdelset(&(sigAct.sa_mask), SIGBUS);
1719 sigdelset(&(sigAct.sa_mask), SIGILL);
1720 sigdelset(&(sigAct.sa_mask), SIGFPE);
1721 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1722
1723 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1724
1725 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1726
1727 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1728 // -1 means registration failed
1729 return (void *)-1;
1730 }
1731
1732 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1733 }
1734
1735 void os::signal_raise(int signal_number) {
1736 ::raise(signal_number);
1737 }
1738
1739 //
1740 // The following code is moved from os.cpp for making this
1741 // code platform specific, which it is by its very nature.
1742 //
1743
1744 // Will be modified when max signal is changed to be dynamic
1745 int os::sigexitnum_pd() {
1746 return NSIG;
1747 }
1748
1749 // a counter for each possible signal value
1750 static volatile jint pending_signals[NSIG+1] = { 0 };
1751
1752 // Linux(POSIX) specific hand shaking semaphore.
1753 static sem_t sig_sem;
1754
1755 void os::signal_init_pd() {
1756 // Initialize signal structures
1757 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1758
1759 // Initialize signal semaphore
1760 int rc = ::sem_init(&sig_sem, 0, 0);
1761 guarantee(rc != -1, "sem_init failed");
1762 }
1763
1764 void os::signal_notify(int sig) {
1765 Atomic::inc(&pending_signals[sig]);
1766 ::sem_post(&sig_sem);
1767 }
1768
1769 static int check_pending_signals(bool wait) {
1770 Atomic::store(0, &sigint_count);
1771 for (;;) {
1772 for (int i = 0; i < NSIG + 1; i++) {
1773 jint n = pending_signals[i];
1774 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1775 return i;
1776 }
1777 }
1778 if (!wait) {
1779 return -1;
1780 }
1781 JavaThread *thread = JavaThread::current();
1782 ThreadBlockInVM tbivm(thread);
1783
1784 bool threadIsSuspended;
1785 do {
1786 thread->set_suspend_equivalent();
1787 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1788
1789 ::sem_wait(&sig_sem);
1790
1791 // were we externally suspended while we were waiting?
1792 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1793 if (threadIsSuspended) {
1794 //
1795 // The semaphore has been incremented, but while we were waiting
1796 // another thread suspended us. We don't want to continue running
1797 // while suspended because that would surprise the thread that
1798 // suspended us.
1799 //
1800 ::sem_post(&sig_sem);
1801
1802 thread->java_suspend_self();
1803 }
1804 } while (threadIsSuspended);
1805 }
1806 }
1807
1808 int os::signal_lookup() {
1809 return check_pending_signals(false);
1810 }
1811
1812 int os::signal_wait() {
1813 return check_pending_signals(true);
1814 }
1815
1816 ////////////////////////////////////////////////////////////////////////////////
1817 // Virtual Memory
1818
1819 // AddrRange describes an immutable address range
1820 //
1821 // This is a helper class for the 'shared memory bookkeeping' below.
1822 class AddrRange {
1823 friend class ShmBkBlock;
1824
1825 char* _start;
1826 size_t _size;
1827
1828 public:
1829
1830 AddrRange(char* start, size_t size)
1831 : _start(start), _size(size)
1832 {}
1833
1834 AddrRange(const AddrRange& r)
1835 : _start(r.start()), _size(r.size())
1836 {}
1837
1838 char* start() const { return _start; }
1839 size_t size() const { return _size; }
1840 char* end() const { return _start + _size; }
1841 bool is_empty() const { return _size == 0 ? true : false; }
1842
1843 static AddrRange empty_range() { return AddrRange(NULL, 0); }
1844
1845 bool contains(const char* p) const {
1846 return start() <= p && end() > p;
1847 }
1848
1849 bool contains(const AddrRange& range) const {
1850 return start() <= range.start() && end() >= range.end();
1851 }
1852
1853 bool intersects(const AddrRange& range) const {
1854 return (range.start() <= start() && range.end() > start()) ||
1855 (range.start() < end() && range.end() >= end()) ||
1856 contains(range);
1857 }
1858
1859 bool is_same_range(const AddrRange& range) const {
1860 return start() == range.start() && size() == range.size();
1861 }
1862
1863 // return the closest inside range consisting of whole pages
1864 AddrRange find_closest_aligned_range(size_t pagesize) const {
1865 if (pagesize == 0 || is_empty()) {
1866 return empty_range();
1867 }
1868 char* const from = (char*)align_size_up((intptr_t)_start, pagesize);
1869 char* const to = (char*)align_size_down((intptr_t)end(), pagesize);
1870 if (from > to) {
1871 return empty_range();
1872 }
1873 return AddrRange(from, to - from);
1874 }
1875 };
1876
1877 ////////////////////////////////////////////////////////////////////////////
1878 // shared memory bookkeeping
1879 //
1880 // the os::reserve_memory() API and friends hand out different kind of memory, depending
1881 // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat.
1882 //
1883 // But these memory types have to be treated differently. For example, to uncommit
1884 // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory,
1885 // disclaim64() is needed.
1886 //
1887 // Therefore we need to keep track of the allocated memory segments and their
1888 // properties.
1889
1890 // ShmBkBlock: base class for all blocks in the shared memory bookkeeping
1891 class ShmBkBlock {
1892
1893 ShmBkBlock* _next;
1894
1895 protected:
1896
1897 AddrRange _range;
1898 const size_t _pagesize;
1899 const bool _pinned;
1900
1901 public:
1902
1903 ShmBkBlock(AddrRange range, size_t pagesize, bool pinned)
1904 : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) {
1905
1906 assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size");
1907 assert(!_range.is_empty(), "invalid range");
1908 }
1909
1910 virtual void print(outputStream* st) const {
1911 st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s",
1912 _range.start(), _range.end(), _range.size(),
1913 _range.size() / _pagesize, describe_pagesize(_pagesize),
1914 _pinned ? "pinned" : "");
1915 }
1916
1917 enum Type { MMAP, SHMAT };
1918 virtual Type getType() = 0;
1919
1920 char* base() const { return _range.start(); }
1921 size_t size() const { return _range.size(); }
1922
1923 void setAddrRange(AddrRange range) {
1924 _range = range;
1925 }
1926
1927 bool containsAddress(const char* p) const {
1928 return _range.contains(p);
1929 }
1930
1931 bool containsRange(const char* p, size_t size) const {
1932 return _range.contains(AddrRange((char*)p, size));
1933 }
1934
1935 bool isSameRange(const char* p, size_t size) const {
1936 return _range.is_same_range(AddrRange((char*)p, size));
1937 }
1938
1939 virtual bool disclaim(char* p, size_t size) = 0;
1940 virtual bool release() = 0;
1941
1942 // blocks live in a list.
1943 ShmBkBlock* next() const { return _next; }
1944 void set_next(ShmBkBlock* blk) { _next = blk; }
1945
1946 }; // end: ShmBkBlock
1947
1948
1949 // ShmBkMappedBlock: describes an block allocated with mmap()
1950 class ShmBkMappedBlock : public ShmBkBlock {
1951 public:
1952
1953 ShmBkMappedBlock(AddrRange range)
1954 : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned
1955
1956 void print(outputStream* st) const {
1957 ShmBkBlock::print(st);
1958 st->print_cr(" - mmap'ed");
1959 }
1960
1961 Type getType() {
1962 return MMAP;
1963 }
1964
1965 bool disclaim(char* p, size_t size) {
1966
1967 AddrRange r(p, size);
1968
1969 guarantee(_range.contains(r), "invalid disclaim");
1970
1971 // only disclaim whole ranges.
1972 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
1973 if (r2.is_empty()) {
1974 return true;
1975 }
1976
1977 const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE);
1978
1979 if (rc != 0) {
1980 warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno);
1981 }
1982
1983 return rc == 0 ? true : false;
1984 }
1985
1986 bool release() {
1987 // mmap'ed blocks are released using munmap
1988 if (::munmap(_range.start(), _range.size()) != 0) {
1989 warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno);
1990 return false;
1991 }
1992 return true;
1993 }
1994 }; // end: ShmBkMappedBlock
1995
1996 // ShmBkShmatedBlock: describes an block allocated with shmget/shmat()
1997 class ShmBkShmatedBlock : public ShmBkBlock {
1998 public:
1999
2000 ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned)
2001 : ShmBkBlock(range, pagesize, pinned) {}
2002
2003 void print(outputStream* st) const {
2004 ShmBkBlock::print(st);
2005 st->print_cr(" - shmat'ed");
2006 }
2007
2008 Type getType() {
2009 return SHMAT;
2010 }
2011
2012 bool disclaim(char* p, size_t size) {
2013
2014 AddrRange r(p, size);
2015
2016 if (_pinned) {
2017 return true;
2018 }
2019
2020 // shmat'ed blocks are disclaimed using disclaim64
2021 guarantee(_range.contains(r), "invalid disclaim");
2022
2023 // only disclaim whole ranges.
2024 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
2025 if (r2.is_empty()) {
2026 return true;
2027 }
2028
2029 const bool rc = my_disclaim64(r2.start(), r2.size());
2030
2031 if (Verbose && !rc) {
2032 warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end());
2033 }
2034
2035 return rc;
2036 }
2037
2038 bool release() {
2039 bool rc = false;
2040 if (::shmdt(_range.start()) != 0) {
2041 warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno);
2042 } else {
2043 rc = true;
2044 }
2045 return rc;
2046 }
2047
2048 }; // end: ShmBkShmatedBlock
2049
2050 static ShmBkBlock* g_shmbk_list = NULL;
2051 static volatile jint g_shmbk_table_lock = 0;
2052
2053 // keep some usage statistics
2054 static struct {
2055 int nodes; // number of nodes in list
2056 size_t bytes; // reserved - not committed - bytes.
2057 int reserves; // how often reserve was called
2058 int lookups; // how often a lookup was made
2059 } g_shmbk_stats = { 0, 0, 0, 0 };
2060
2061 // add information about a shared memory segment to the bookkeeping
2062 static void shmbk_register(ShmBkBlock* p_block) {
2063 guarantee(p_block, "logic error");
2064 p_block->set_next(g_shmbk_list);
2065 g_shmbk_list = p_block;
2066 g_shmbk_stats.reserves ++;
2067 g_shmbk_stats.bytes += p_block->size();
2068 g_shmbk_stats.nodes ++;
2069 }
2070
2071 // remove information about a shared memory segment by its starting address
2072 static void shmbk_unregister(ShmBkBlock* p_block) {
2073 ShmBkBlock* p = g_shmbk_list;
2074 ShmBkBlock* prev = NULL;
2075 while (p) {
2076 if (p == p_block) {
2077 if (prev) {
2078 prev->set_next(p->next());
2079 } else {
2080 g_shmbk_list = p->next();
2081 }
2082 g_shmbk_stats.nodes --;
2083 g_shmbk_stats.bytes -= p->size();
2084 return;
2085 }
2086 prev = p;
2087 p = p->next();
2088 }
2089 assert(false, "should not happen");
2090 }
2091
2092 // given a pointer, return shared memory bookkeeping record for the segment it points into
2093 // using the returned block info must happen under lock protection
2094 static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) {
2095 g_shmbk_stats.lookups ++;
2096 ShmBkBlock* p = g_shmbk_list;
2097 while (p) {
2098 if (p->containsAddress(addr)) {
2099 return p;
2100 }
2101 p = p->next();
2102 }
2103 return NULL;
2104 }
2105
2106 // dump all information about all memory segments allocated with os::reserve_memory()
2107 void shmbk_dump_info() {
2108 tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, "
2109 "total reserves: %d total lookups: %d)",
2110 g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups);
2111 const ShmBkBlock* p = g_shmbk_list;
2112 int i = 0;
2113 while (p) {
2114 p->print(tty);
2115 p = p->next();
2116 i ++;
2117 }
2118 }
2119
2120 #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK;
2121 #define UNLOCK_SHMBK }
2122
2123 // End: shared memory bookkeeping
2124 ////////////////////////////////////////////////////////////////////////////////////////////////////
2125
2126 int os::vm_page_size() {
2127 // Seems redundant as all get out
2128 assert(os::Aix::page_size() != -1, "must call os::init");
2129 return os::Aix::page_size();
2130 }
2131
2132 // Aix allocates memory by pages.
2133 int os::vm_allocation_granularity() {
2134 assert(os::Aix::page_size() != -1, "must call os::init");
2135 return os::Aix::page_size();
2136 }
2137
2138 int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) {
2139
2140 // Commit is a noop. There is no explicit commit
2141 // needed on AIX. Memory is committed when touched.
2142 //
2143 // Debug : check address range for validity
2144 #ifdef ASSERT
2145 LOCK_SHMBK
2146 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2147 if (!block) {
2148 fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr);
2149 shmbk_dump_info();
2150 assert(false, "invalid pointer");
2151 return false;
2152 } else if (!block->containsRange(addr, size)) {
2153 fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size);
2154 shmbk_dump_info();
2155 assert(false, "invalid range");
2156 return false;
2157 }
2158 UNLOCK_SHMBK
2159 #endif // ASSERT
2160
2161 return 0;
2162 }
2163
2164 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2165 return os::Aix::commit_memory_impl(addr, size, exec) == 0;
2166 }
2167
2168 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2169 const char* mesg) {
2170 assert(mesg != NULL, "mesg must be specified");
2171 os::Aix::commit_memory_impl(addr, size, exec);
2172 }
2173
2174 int os::Aix::commit_memory_impl(char* addr, size_t size,
2175 size_t alignment_hint, bool exec) {
2176 return os::Aix::commit_memory_impl(addr, size, exec);
2177 }
2178
2179 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2180 bool exec) {
2181 return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0;
2182 }
2183
2184 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2185 size_t alignment_hint, bool exec,
2186 const char* mesg) {
2187 os::Aix::commit_memory_impl(addr, size, alignment_hint, exec);
2188 }
2189
2190 bool os::pd_uncommit_memory(char* addr, size_t size) {
2191
2192 // Delegate to ShmBkBlock class which knows how to uncommit its memory.
2193
2194 bool rc = false;
2195 LOCK_SHMBK
2196 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2197 if (!block) {
2198 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2199 shmbk_dump_info();
2200 assert(false, "invalid pointer");
2201 return false;
2202 } else if (!block->containsRange(addr, size)) {
2203 fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size);
2204 shmbk_dump_info();
2205 assert(false, "invalid range");
2206 return false;
2207 }
2208 rc = block->disclaim(addr, size);
2209 UNLOCK_SHMBK
2210
2211 if (Verbose && !rc) {
2212 warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size);
2213 }
2214 return rc;
2215 }
2216
2217 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2218 return os::guard_memory(addr, size);
2219 }
2220
2221 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2222 return os::unguard_memory(addr, size);
2223 }
2224
2225 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2226 }
2227
2228 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2229 }
2230
2231 void os::numa_make_global(char *addr, size_t bytes) {
2232 }
2233
2234 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2235 }
2236
2237 bool os::numa_topology_changed() {
2238 return false;
2239 }
2240
2241 size_t os::numa_get_groups_num() {
2242 return 1;
2243 }
2244
2245 int os::numa_get_group_id() {
2246 return 0;
2247 }
2248
2249 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2250 if (size > 0) {
2251 ids[0] = 0;
2252 return 1;
2253 }
2254 return 0;
2255 }
2256
2257 bool os::get_page_info(char *start, page_info* info) {
2258 return false;
2259 }
2260
2261 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2262 return end;
2263 }
2264
2265 // Flags for reserve_shmatted_memory:
2266 #define RESSHM_WISHADDR_OR_FAIL 1
2267 #define RESSHM_TRY_16M_PAGES 2
2268 #define RESSHM_16M_PAGES_OR_FAIL 4
2269
2270 // Result of reserve_shmatted_memory:
2271 struct shmatted_memory_info_t {
2272 char* addr;
2273 size_t pagesize;
2274 bool pinned;
2275 };
2276
2277 // Reserve a section of shmatted memory.
2278 // params:
2279 // bytes [in]: size of memory, in bytes
2280 // requested_addr [in]: wish address.
2281 // NULL = no wish.
2282 // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot
2283 // be obtained, function will fail. Otherwise wish address is treated as hint and
2284 // another pointer is returned.
2285 // flags [in]: some flags. Valid flags are:
2286 // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained.
2287 // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool
2288 // (requires UseLargePages and Use16MPages)
2289 // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail.
2290 // Otherwise any other page size will do.
2291 // p_info [out] : holds information about the created shared memory segment.
2292 static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) {
2293
2294 assert(p_info, "parameter error");
2295
2296 // init output struct.
2297 p_info->addr = NULL;
2298
2299 // neither should we be here for EXTSHM=ON.
2300 if (os::Aix::extshm()) {
2301 ShouldNotReachHere();
2302 }
2303
2304 // extract flags. sanity checks.
2305 const bool wishaddr_or_fail =
2306 flags & RESSHM_WISHADDR_OR_FAIL;
2307 const bool try_16M_pages =
2308 flags & RESSHM_TRY_16M_PAGES;
2309 const bool f16M_pages_or_fail =
2310 flags & RESSHM_16M_PAGES_OR_FAIL;
2311
2312 // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary,
2313 // shmat will fail anyway, so save some cycles by failing right away
2314 if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) {
2315 if (wishaddr_or_fail) {
2316 return false;
2317 } else {
2318 requested_addr = NULL;
2319 }
2320 }
2321
2322 char* addr = NULL;
2323
2324 // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change
2325 // pagesize dynamically.
2326 const size_t size = align_size_up(bytes, SIZE_16M);
2327
2328 // reserve the shared segment
2329 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2330 if (shmid == -1) {
2331 warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno);
2332 return false;
2333 }
2334
2335 // Important note:
2336 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2337 // We must right after attaching it remove it from the system. System V shm segments are global and
2338 // survive the process.
2339 // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm".
2340
2341 // try forcing the page size
2342 size_t pagesize = -1; // unknown so far
2343
2344 if (UseLargePages) {
2345
2346 struct shmid_ds shmbuf;
2347 memset(&shmbuf, 0, sizeof(shmbuf));
2348
2349 // First, try to take from 16M page pool if...
2350 if (os::Aix::can_use_16M_pages() // we can ...
2351 && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages)..
2352 && try_16M_pages) { // caller wants us to.
2353 shmbuf.shm_pagesize = SIZE_16M;
2354 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2355 pagesize = SIZE_16M;
2356 } else {
2357 warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)",
2358 size / SIZE_16M, errno);
2359 if (f16M_pages_or_fail) {
2360 goto cleanup_shm;
2361 }
2362 }
2363 }
2364
2365 // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might,
2366 // because the 64K page pool may also be exhausted.
2367 if (pagesize == -1) {
2368 shmbuf.shm_pagesize = SIZE_64K;
2369 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2370 pagesize = SIZE_64K;
2371 } else {
2372 warning("Failed to allocate %d 64K pages. (shmctl failed with %d)",
2373 size / SIZE_64K, errno);
2374 // here I give up. leave page_size -1 - later, after attaching, we will query the
2375 // real page size of the attached memory. (in theory, it may be something different
2376 // from 4K if LDR_CNTRL SHM_PSIZE is set)
2377 }
2378 }
2379 }
2380
2381 // sanity point
2382 assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size");
2383
2384 // Now attach the shared segment.
2385 addr = (char*) shmat(shmid, requested_addr, 0);
2386 if (addr == (char*)-1) {
2387 // How to handle attach failure:
2388 // If it failed for a specific wish address, tolerate this: in that case, if wish address was
2389 // mandatory, fail, if not, retry anywhere.
2390 // If it failed for any other reason, treat that as fatal error.
2391 addr = NULL;
2392 if (requested_addr) {
2393 if (wishaddr_or_fail) {
2394 goto cleanup_shm;
2395 } else {
2396 addr = (char*) shmat(shmid, NULL, 0);
2397 if (addr == (char*)-1) { // fatal
2398 addr = NULL;
2399 warning("shmat failed (errno: %d)", errno);
2400 goto cleanup_shm;
2401 }
2402 }
2403 } else { // fatal
2404 addr = NULL;
2405 warning("shmat failed (errno: %d)", errno);
2406 goto cleanup_shm;
2407 }
2408 }
2409
2410 // sanity point
2411 assert(addr && addr != (char*) -1, "wrong address");
2412
2413 // after successful Attach remove the segment - right away.
2414 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2415 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2416 guarantee(false, "failed to remove shared memory segment!");
2417 }
2418 shmid = -1;
2419
2420 // query the real page size. In case setting the page size did not work (see above), the system
2421 // may have given us something other then 4K (LDR_CNTRL)
2422 {
2423 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2424 if (pagesize != -1) {
2425 assert(pagesize == real_pagesize, "unexpected pagesize after shmat");
2426 } else {
2427 pagesize = real_pagesize;
2428 }
2429 }
2430
2431 // Now register the reserved block with internal book keeping.
2432 LOCK_SHMBK
2433 const bool pinned = pagesize >= SIZE_16M ? true : false;
2434 ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned);
2435 assert(p_block, "");
2436 shmbk_register(p_block);
2437 UNLOCK_SHMBK
2438
2439 cleanup_shm:
2440
2441 // if we have not done so yet, remove the shared memory segment. This is very important.
2442 if (shmid != -1) {
2443 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2444 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2445 guarantee(false, "failed to remove shared memory segment!");
2446 }
2447 shmid = -1;
2448 }
2449
2450 // trace
2451 if (Verbose && !addr) {
2452 if (requested_addr != NULL) {
2453 warning("failed to shm-allocate 0x%llX bytes at wish address 0x%p.", size, requested_addr);
2454 } else {
2455 warning("failed to shm-allocate 0x%llX bytes at any address.", size);
2456 }
2457 }
2458
2459 // hand info to caller
2460 if (addr) {
2461 p_info->addr = addr;
2462 p_info->pagesize = pagesize;
2463 p_info->pinned = pagesize == SIZE_16M ? true : false;
2464 }
2465
2466 // sanity test:
2467 if (requested_addr && addr && wishaddr_or_fail) {
2468 guarantee(addr == requested_addr, "shmat error");
2469 }
2470
2471 // just one more test to really make sure we have no dangling shm segments.
2472 guarantee(shmid == -1, "dangling shm segments");
2473
2474 return addr ? true : false;
2475
2476 } // end: reserve_shmatted_memory
2477
2478 // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory():
2479 // will return NULL in case of an error.
2480 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) {
2481
2482 // if a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2483 if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) {
2484 warning("Wish address 0x%p not aligned to page boundary.", requested_addr);
2485 return NULL;
2486 }
2487
2488 const size_t size = align_size_up(bytes, SIZE_4K);
2489
2490 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2491 // msync(MS_INVALIDATE) (see os::uncommit_memory)
2492 int flags = MAP_ANONYMOUS | MAP_SHARED;
2493
2494 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2495 // it means if wishaddress is given but MAP_FIXED is not set.
2496 //
2497 // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED
2498 // clobbers the address range, which is probably not what the caller wants. That's
2499 // why I assert here (again) that the SPEC1170 compat mode is off.
2500 // If we want to be able to run under SPEC1170, we have to do some porting and
2501 // testing.
2502 if (requested_addr != NULL) {
2503 assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed.");
2504 flags |= MAP_FIXED;
2505 }
2506
2507 char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2508
2509 if (addr == MAP_FAILED) {
2510 // attach failed: tolerate for specific wish addresses. Not being able to attach
2511 // anywhere is a fatal error.
2512 if (requested_addr == NULL) {
2513 // It's ok to fail here if the machine has not enough memory.
2514 warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno);
2515 }
2516 addr = NULL;
2517 goto cleanup_mmap;
2518 }
2519
2520 // If we did request a specific address and that address was not available, fail.
2521 if (addr && requested_addr) {
2522 guarantee(addr == requested_addr, "unexpected");
2523 }
2524
2525 // register this mmap'ed segment with book keeping
2526 LOCK_SHMBK
2527 ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size));
2528 assert(p_block, "");
2529 shmbk_register(p_block);
2530 UNLOCK_SHMBK
2531
2532 cleanup_mmap:
2533
2534 // trace
2535 if (Verbose) {
2536 if (addr) {
2537 fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes);
2538 }
2539 else {
2540 if (requested_addr != NULL) {
2541 warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr);
2542 } else {
2543 warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes);
2544 }
2545 }
2546 }
2547
2548 return addr;
2549
2550 } // end: reserve_mmaped_memory
2551
2552 // Reserves and attaches a shared memory segment.
2553 // Will assert if a wish address is given and could not be obtained.
2554 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2555 return os::attempt_reserve_memory_at(bytes, requested_addr);
2556 }
2557
2558 bool os::pd_release_memory(char* addr, size_t size) {
2559
2560 // delegate to ShmBkBlock class which knows how to uncommit its memory.
2561
2562 bool rc = false;
2563 LOCK_SHMBK
2564 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2565 if (!block) {
2566 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2567 shmbk_dump_info();
2568 assert(false, "invalid pointer");
2569 return false;
2570 }
2571 else if (!block->isSameRange(addr, size)) {
2572 if (block->getType() == ShmBkBlock::MMAP) {
2573 // Release only the same range or a the beginning or the end of a range.
2574 if (block->base() == addr && size < block->size()) {
2575 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size));
2576 assert(b, "");
2577 shmbk_register(b);
2578 block->setAddrRange(AddrRange(addr, size));
2579 }
2580 else if (addr > block->base() && addr + size == block->base() + block->size()) {
2581 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size));
2582 assert(b, "");
2583 shmbk_register(b);
2584 block->setAddrRange(AddrRange(addr, size));
2585 }
2586 else {
2587 fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size);
2588 shmbk_dump_info();
2589 assert(false, "invalid mmap range");
2590 return false;
2591 }
2592 }
2593 else {
2594 // Release only the same range. No partial release allowed.
2595 // Soften the requirement a bit, because the user may think he owns a smaller size
2596 // than the block is due to alignment etc.
2597 if (block->base() != addr || block->size() < size) {
2598 fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size);
2599 shmbk_dump_info();
2600 assert(false, "invalid shmget range");
2601 return false;
2602 }
2603 }
2604 }
2605 rc = block->release();
2606 assert(rc, "release failed");
2607 // remove block from bookkeeping
2608 shmbk_unregister(block);
2609 delete block;
2610 UNLOCK_SHMBK
2611
2612 if (!rc) {
2613 warning("failed to released %lu bytes at 0x%p", size, addr);
2614 }
2615
2616 return rc;
2617 }
2618
2619 static bool checked_mprotect(char* addr, size_t size, int prot) {
2620
2621 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2622 // not tell me if protection failed when trying to protect an un-protectable range.
2623 //
2624 // This means if the memory was allocated using shmget/shmat, protection wont work
2625 // but mprotect will still return 0:
2626 //
2627 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2628
2629 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2630
2631 if (!rc) {
2632 const char* const s_errno = strerror(errno);
2633 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2634 return false;
2635 }
2636
2637 // mprotect success check
2638 //
2639 // Mprotect said it changed the protection but can I believe it?
2640 //
2641 // To be sure I need to check the protection afterwards. Try to
2642 // read from protected memory and check whether that causes a segfault.
2643 //
2644 if (!os::Aix::xpg_sus_mode()) {
2645
2646 if (StubRoutines::SafeFetch32_stub()) {
2647
2648 const bool read_protected =
2649 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2650 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2651
2652 if (prot & PROT_READ) {
2653 rc = !read_protected;
2654 } else {
2655 rc = read_protected;
2656 }
2657 }
2658 }
2659 if (!rc) {
2660 assert(false, "mprotect failed.");
2661 }
2662 return rc;
2663 }
2664
2665 // Set protections specified
2666 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2667 unsigned int p = 0;
2668 switch (prot) {
2669 case MEM_PROT_NONE: p = PROT_NONE; break;
2670 case MEM_PROT_READ: p = PROT_READ; break;
2671 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2672 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2673 default:
2674 ShouldNotReachHere();
2675 }
2676 // is_committed is unused.
2677 return checked_mprotect(addr, size, p);
2678 }
2679
2680 bool os::guard_memory(char* addr, size_t size) {
2681 return checked_mprotect(addr, size, PROT_NONE);
2682 }
2683
2684 bool os::unguard_memory(char* addr, size_t size) {
2685 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2686 }
2687
2688 // Large page support
2689
2690 static size_t _large_page_size = 0;
2691
2692 // Enable large page support if OS allows that.
2693 void os::large_page_init() {
2694
2695 // Note: os::Aix::query_multipage_support must run first.
2696
2697 if (!UseLargePages) {
2698 return;
2699 }
2700
2701 if (!Aix::can_use_64K_pages()) {
2702 assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M.");
2703 UseLargePages = false;
2704 return;
2705 }
2706
2707 if (!Aix::can_use_16M_pages() && Use16MPages) {
2708 fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool "
2709 " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n");
2710 }
2711
2712 // Do not report 16M page alignment as part of os::_page_sizes if we are
2713 // explicitly forbidden from using 16M pages. Doing so would increase the
2714 // alignment the garbage collector calculates with, slightly increasing
2715 // heap usage. We should only pay for 16M alignment if we really want to
2716 // use 16M pages.
2717 if (Use16MPages && Aix::can_use_16M_pages()) {
2718 _large_page_size = SIZE_16M;
2719 _page_sizes[0] = SIZE_16M;
2720 _page_sizes[1] = SIZE_64K;
2721 _page_sizes[2] = SIZE_4K;
2722 _page_sizes[3] = 0;
2723 } else if (Aix::can_use_64K_pages()) {
2724 _large_page_size = SIZE_64K;
2725 _page_sizes[0] = SIZE_64K;
2726 _page_sizes[1] = SIZE_4K;
2727 _page_sizes[2] = 0;
2728 }
2729
2730 if (Verbose) {
2731 ("Default large page size is 0x%llX.", _large_page_size);
2732 }
2733 } // end: os::large_page_init()
2734
2735 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2736 // "exec" is passed in but not used. Creating the shared image for
2737 // the code cache doesn't have an SHM_X executable permission to check.
2738 Unimplemented();
2739 return 0;
2740 }
2741
2742 bool os::release_memory_special(char* base, size_t bytes) {
2743 // detaching the SHM segment will also delete it, see reserve_memory_special()
2744 Unimplemented();
2745 return false;
2746 }
2747
2748 size_t os::large_page_size() {
2749 return _large_page_size;
2750 }
2751
2752 bool os::can_commit_large_page_memory() {
2753 // Well, sadly we cannot commit anything at all (see comment in
2754 // os::commit_memory) but we claim to so we can make use of large pages
2755 return true;
2756 }
2757
2758 bool os::can_execute_large_page_memory() {
2759 // We can do that
2760 return true;
2761 }
2762
2763 // Reserve memory at an arbitrary address, only if that area is
2764 // available (and not reserved for something else).
2765 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2766
2767 bool use_mmap = false;
2768
2769 // mmap: smaller graining, no large page support
2770 // shm: large graining (256M), large page support, limited number of shm segments
2771 //
2772 // Prefer mmap wherever we either do not need large page support or have OS limits
2773
2774 if (!UseLargePages || bytes < SIZE_16M) {
2775 use_mmap = true;
2776 }
2777
2778 char* addr = NULL;
2779 if (use_mmap) {
2780 addr = reserve_mmaped_memory(bytes, requested_addr);
2781 } else {
2782 // shmat: wish address is mandatory, and do not try 16M pages here.
2783 shmatted_memory_info_t info;
2784 const int flags = RESSHM_WISHADDR_OR_FAIL;
2785 if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) {
2786 addr = info.addr;
2787 }
2788 }
2789
2790 return addr;
2791 }
2792
2793 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2794 return ::read(fd, buf, nBytes);
2795 }
2796
2797 void os::naked_short_sleep(jlong ms) {
2798 struct timespec req;
2799
2800 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2801 req.tv_sec = 0;
2802 if (ms > 0) {
2803 req.tv_nsec = (ms % 1000) * 1000000;
2804 }
2805 else {
2806 req.tv_nsec = 1;
2807 }
2808
2809 nanosleep(&req, NULL);
2810
2811 return;
2812 }
2813
2814 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2815 void os::infinite_sleep() {
2816 while (true) { // sleep forever ...
2817 ::sleep(100); // ... 100 seconds at a time
2818 }
2819 }
2820
2821 // Used to convert frequent JVM_Yield() to nops
2822 bool os::dont_yield() {
2823 return DontYieldALot;
2824 }
2825
2826 void os::yield() {
2827 sched_yield();
2828 }
2829
2830 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN; }
2831
2832 void os::yield_all() {
2833 // Yields to all threads, including threads with lower priorities
2834 // Threads on Linux are all with same priority. The Solaris style
2835 // os::yield_all() with nanosleep(1ms) is not necessary.
2836 sched_yield();
2837 }
2838
2839 ////////////////////////////////////////////////////////////////////////////////
2840 // thread priority support
2841
2842 // From AIX manpage to pthread_setschedparam
2843 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2844 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2845 //
2846 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2847 // range from 40 to 80, where 40 is the least favored priority and 80
2848 // is the most favored."
2849 //
2850 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2851 // scheduling there; however, this still leaves iSeries.)
2852 //
2853 // We use the same values for AIX and PASE.
2854 int os::java_to_os_priority[CriticalPriority + 1] = {
2855 54, // 0 Entry should never be used
2856
2857 55, // 1 MinPriority
2858 55, // 2
2859 56, // 3
2860
2861 56, // 4
2862 57, // 5 NormPriority
2863 57, // 6
2864
2865 58, // 7
2866 58, // 8
2867 59, // 9 NearMaxPriority
2868
2869 60, // 10 MaxPriority
2870
2871 60 // 11 CriticalPriority
2872 };
2873
2874 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2875 if (!UseThreadPriorities) return OS_OK;
2876 pthread_t thr = thread->osthread()->pthread_id();
2877 int policy = SCHED_OTHER;
2878 struct sched_param param;
2879 param.sched_priority = newpri;
2880 int ret = pthread_setschedparam(thr, policy, ¶m);
2881
2882 if (Verbose) {
2883 if (ret == 0) {
2884 fprintf(stderr, "changed priority of thread %d to %d\n", (int)thr, newpri);
2885 } else {
2886 fprintf(stderr, "Could not changed priority for thread %d to %d (error %d, %s)\n",
2887 (int)thr, newpri, ret, strerror(ret));
2888 }
2889 }
2890 return (ret == 0) ? OS_OK : OS_ERR;
2891 }
2892
2893 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2894 if (!UseThreadPriorities) {
2895 *priority_ptr = java_to_os_priority[NormPriority];
2896 return OS_OK;
2897 }
2898 pthread_t thr = thread->osthread()->pthread_id();
2899 int policy = SCHED_OTHER;
2900 struct sched_param param;
2901 int ret = pthread_getschedparam(thr, &policy, ¶m);
2902 *priority_ptr = param.sched_priority;
2903
2904 return (ret == 0) ? OS_OK : OS_ERR;
2905 }
2906
2907 // Hint to the underlying OS that a task switch would not be good.
2908 // Void return because it's a hint and can fail.
2909 void os::hint_no_preempt() {}
2910
2911 ////////////////////////////////////////////////////////////////////////////////
2912 // suspend/resume support
2913
2914 // the low-level signal-based suspend/resume support is a remnant from the
2915 // old VM-suspension that used to be for java-suspension, safepoints etc,
2916 // within hotspot. Now there is a single use-case for this:
2917 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2918 // that runs in the watcher thread.
2919 // The remaining code is greatly simplified from the more general suspension
2920 // code that used to be used.
2921 //
2922 // The protocol is quite simple:
2923 // - suspend:
2924 // - sends a signal to the target thread
2925 // - polls the suspend state of the osthread using a yield loop
2926 // - target thread signal handler (SR_handler) sets suspend state
2927 // and blocks in sigsuspend until continued
2928 // - resume:
2929 // - sets target osthread state to continue
2930 // - sends signal to end the sigsuspend loop in the SR_handler
2931 //
2932 // Note that the SR_lock plays no role in this suspend/resume protocol.
2933 //
2934
2935 static void resume_clear_context(OSThread *osthread) {
2936 osthread->set_ucontext(NULL);
2937 osthread->set_siginfo(NULL);
2938 }
2939
2940 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2941 osthread->set_ucontext(context);
2942 osthread->set_siginfo(siginfo);
2943 }
2944
2945 //
2946 // Handler function invoked when a thread's execution is suspended or
2947 // resumed. We have to be careful that only async-safe functions are
2948 // called here (Note: most pthread functions are not async safe and
2949 // should be avoided.)
2950 //
2951 // Note: sigwait() is a more natural fit than sigsuspend() from an
2952 // interface point of view, but sigwait() prevents the signal hander
2953 // from being run. libpthread would get very confused by not having
2954 // its signal handlers run and prevents sigwait()'s use with the
2955 // mutex granting granting signal.
2956 //
2957 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2958 //
2959 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2960 // Save and restore errno to avoid confusing native code with EINTR
2961 // after sigsuspend.
2962 int old_errno = errno;
2963
2964 Thread* thread = Thread::current();
2965 OSThread* osthread = thread->osthread();
2966 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2967
2968 os::SuspendResume::State current = osthread->sr.state();
2969 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2970 suspend_save_context(osthread, siginfo, context);
2971
2972 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2973 os::SuspendResume::State state = osthread->sr.suspended();
2974 if (state == os::SuspendResume::SR_SUSPENDED) {
2975 sigset_t suspend_set; // signals for sigsuspend()
2976
2977 // get current set of blocked signals and unblock resume signal
2978 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2979 sigdelset(&suspend_set, SR_signum);
2980
2981 // wait here until we are resumed
2982 while (1) {
2983 sigsuspend(&suspend_set);
2984
2985 os::SuspendResume::State result = osthread->sr.running();
2986 if (result == os::SuspendResume::SR_RUNNING) {
2987 break;
2988 }
2989 }
2990
2991 } else if (state == os::SuspendResume::SR_RUNNING) {
2992 // request was cancelled, continue
2993 } else {
2994 ShouldNotReachHere();
2995 }
2996
2997 resume_clear_context(osthread);
2998 } else if (current == os::SuspendResume::SR_RUNNING) {
2999 // request was cancelled, continue
3000 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
3001 // ignore
3002 } else {
3003 ShouldNotReachHere();
3004 }
3005
3006 errno = old_errno;
3007 }
3008
3009
3010 static int SR_initialize() {
3011 struct sigaction act;
3012 char *s;
3013 // Get signal number to use for suspend/resume
3014 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
3015 int sig = ::strtol(s, 0, 10);
3016 if (sig > 0 || sig < NSIG) {
3017 SR_signum = sig;
3018 }
3019 }
3020
3021 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
3022 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
3023
3024 sigemptyset(&SR_sigset);
3025 sigaddset(&SR_sigset, SR_signum);
3026
3027 // Set up signal handler for suspend/resume.
3028 act.sa_flags = SA_RESTART|SA_SIGINFO;
3029 act.sa_handler = (void (*)(int)) SR_handler;
3030
3031 // SR_signum is blocked by default.
3032 // 4528190 - We also need to block pthread restart signal (32 on all
3033 // supported Linux platforms). Note that LinuxThreads need to block
3034 // this signal for all threads to work properly. So we don't have
3035 // to use hard-coded signal number when setting up the mask.
3036 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
3037
3038 if (sigaction(SR_signum, &act, 0) == -1) {
3039 return -1;
3040 }
3041
3042 // Save signal flag
3043 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
3044 return 0;
3045 }
3046
3047 static int SR_finalize() {
3048 return 0;
3049 }
3050
3051 static int sr_notify(OSThread* osthread) {
3052 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3053 assert_status(status == 0, status, "pthread_kill");
3054 return status;
3055 }
3056
3057 // "Randomly" selected value for how long we want to spin
3058 // before bailing out on suspending a thread, also how often
3059 // we send a signal to a thread we want to resume
3060 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3061 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3062
3063 // returns true on success and false on error - really an error is fatal
3064 // but this seems the normal response to library errors
3065 static bool do_suspend(OSThread* osthread) {
3066 assert(osthread->sr.is_running(), "thread should be running");
3067 // mark as suspended and send signal
3068
3069 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3070 // failed to switch, state wasn't running?
3071 ShouldNotReachHere();
3072 return false;
3073 }
3074
3075 if (sr_notify(osthread) != 0) {
3076 // try to cancel, switch to running
3077
3078 os::SuspendResume::State result = osthread->sr.cancel_suspend();
3079 if (result == os::SuspendResume::SR_RUNNING) {
3080 // cancelled
3081 return false;
3082 } else if (result == os::SuspendResume::SR_SUSPENDED) {
3083 // somehow managed to suspend
3084 return true;
3085 } else {
3086 ShouldNotReachHere();
3087 return false;
3088 }
3089 }
3090
3091 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3092
3093 for (int n = 0; !osthread->sr.is_suspended(); n++) {
3094 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
3095 os::yield_all();
3096 }
3097
3098 // timeout, try to cancel the request
3099 if (n >= RANDOMLY_LARGE_INTEGER) {
3100 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3101 if (cancelled == os::SuspendResume::SR_RUNNING) {
3102 return false;
3103 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3104 return true;
3105 } else {
3106 ShouldNotReachHere();
3107 return false;
3108 }
3109 }
3110 }
3111
3112 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3113 return true;
3114 }
3115
3116 static void do_resume(OSThread* osthread) {
3117 //assert(osthread->sr.is_suspended(), "thread should be suspended");
3118
3119 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3120 // failed to switch to WAKEUP_REQUEST
3121 ShouldNotReachHere();
3122 return;
3123 }
3124
3125 while (!osthread->sr.is_running()) {
3126 if (sr_notify(osthread) == 0) {
3127 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
3128 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
3129 os::yield_all();
3130 }
3131 }
3132 } else {
3133 ShouldNotReachHere();
3134 }
3135 }
3136
3137 guarantee(osthread->sr.is_running(), "Must be running!");
3138 }
3139
3140 ///////////////////////////////////////////////////////////////////////////////////
3141 // signal handling (except suspend/resume)
3142
3143 // This routine may be used by user applications as a "hook" to catch signals.
3144 // The user-defined signal handler must pass unrecognized signals to this
3145 // routine, and if it returns true (non-zero), then the signal handler must
3146 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3147 // routine will never retun false (zero), but instead will execute a VM panic
3148 // routine kill the process.
3149 //
3150 // If this routine returns false, it is OK to call it again. This allows
3151 // the user-defined signal handler to perform checks either before or after
3152 // the VM performs its own checks. Naturally, the user code would be making
3153 // a serious error if it tried to handle an exception (such as a null check
3154 // or breakpoint) that the VM was generating for its own correct operation.
3155 //
3156 // This routine may recognize any of the following kinds of signals:
3157 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3158 // It should be consulted by handlers for any of those signals.
3159 //
3160 // The caller of this routine must pass in the three arguments supplied
3161 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3162 // field of the structure passed to sigaction(). This routine assumes that
3163 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3164 //
3165 // Note that the VM will print warnings if it detects conflicting signal
3166 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3167 //
3168 extern "C" JNIEXPORT int
3169 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
3170
3171 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3172 // to be the thing to call; documentation is not terribly clear about whether
3173 // pthread_sigmask also works, and if it does, whether it does the same.
3174 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3175 const int rc = ::pthread_sigmask(how, set, oset);
3176 // return value semantics differ slightly for error case:
3177 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3178 // (so, pthread_sigmask is more theadsafe for error handling)
3179 // But success is always 0.
3180 return rc == 0 ? true : false;
3181 }
3182
3183 // Function to unblock all signals which are, according
3184 // to POSIX, typical program error signals. If they happen while being blocked,
3185 // they typically will bring down the process immediately.
3186 bool unblock_program_error_signals() {
3187 sigset_t set;
3188 ::sigemptyset(&set);
3189 ::sigaddset(&set, SIGILL);
3190 ::sigaddset(&set, SIGBUS);
3191 ::sigaddset(&set, SIGFPE);
3192 ::sigaddset(&set, SIGSEGV);
3193 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3194 }
3195
3196 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3197 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3198 assert(info != NULL && uc != NULL, "it must be old kernel");
3199
3200 // Never leave program error signals blocked;
3201 // on all our platforms they would bring down the process immediately when
3202 // getting raised while being blocked.
3203 unblock_program_error_signals();
3204
3205 JVM_handle_aix_signal(sig, info, uc, true);
3206 }
3207
3208
3209 // This boolean allows users to forward their own non-matching signals
3210 // to JVM_handle_aix_signal, harmlessly.
3211 bool os::Aix::signal_handlers_are_installed = false;
3212
3213 // For signal-chaining
3214 struct sigaction os::Aix::sigact[MAXSIGNUM];
3215 unsigned int os::Aix::sigs = 0;
3216 bool os::Aix::libjsig_is_loaded = false;
3217 typedef struct sigaction *(*get_signal_t)(int);
3218 get_signal_t os::Aix::get_signal_action = NULL;
3219
3220 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3221 struct sigaction *actp = NULL;
3222
3223 if (libjsig_is_loaded) {
3224 // Retrieve the old signal handler from libjsig
3225 actp = (*get_signal_action)(sig);
3226 }
3227 if (actp == NULL) {
3228 // Retrieve the preinstalled signal handler from jvm
3229 actp = get_preinstalled_handler(sig);
3230 }
3231
3232 return actp;
3233 }
3234
3235 static bool call_chained_handler(struct sigaction *actp, int sig,
3236 siginfo_t *siginfo, void *context) {
3237 // Call the old signal handler
3238 if (actp->sa_handler == SIG_DFL) {
3239 // It's more reasonable to let jvm treat it as an unexpected exception
3240 // instead of taking the default action.
3241 return false;
3242 } else if (actp->sa_handler != SIG_IGN) {
3243 if ((actp->sa_flags & SA_NODEFER) == 0) {
3244 // automaticlly block the signal
3245 sigaddset(&(actp->sa_mask), sig);
3246 }
3247
3248 sa_handler_t hand = NULL;
3249 sa_sigaction_t sa = NULL;
3250 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3251 // retrieve the chained handler
3252 if (siginfo_flag_set) {
3253 sa = actp->sa_sigaction;
3254 } else {
3255 hand = actp->sa_handler;
3256 }
3257
3258 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3259 actp->sa_handler = SIG_DFL;
3260 }
3261
3262 // try to honor the signal mask
3263 sigset_t oset;
3264 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3265
3266 // call into the chained handler
3267 if (siginfo_flag_set) {
3268 (*sa)(sig, siginfo, context);
3269 } else {
3270 (*hand)(sig);
3271 }
3272
3273 // restore the signal mask
3274 pthread_sigmask(SIG_SETMASK, &oset, 0);
3275 }
3276 // Tell jvm's signal handler the signal is taken care of.
3277 return true;
3278 }
3279
3280 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3281 bool chained = false;
3282 // signal-chaining
3283 if (UseSignalChaining) {
3284 struct sigaction *actp = get_chained_signal_action(sig);
3285 if (actp != NULL) {
3286 chained = call_chained_handler(actp, sig, siginfo, context);
3287 }
3288 }
3289 return chained;
3290 }
3291
3292 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3293 if ((((unsigned int)1 << sig) & sigs) != 0) {
3294 return &sigact[sig];
3295 }
3296 return NULL;
3297 }
3298
3299 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3300 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3301 sigact[sig] = oldAct;
3302 sigs |= (unsigned int)1 << sig;
3303 }
3304
3305 // for diagnostic
3306 int os::Aix::sigflags[MAXSIGNUM];
3307
3308 int os::Aix::get_our_sigflags(int sig) {
3309 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3310 return sigflags[sig];
3311 }
3312
3313 void os::Aix::set_our_sigflags(int sig, int flags) {
3314 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3315 sigflags[sig] = flags;
3316 }
3317
3318 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3319 // Check for overwrite.
3320 struct sigaction oldAct;
3321 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3322
3323 void* oldhand = oldAct.sa_sigaction
3324 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3325 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3326 // Renamed 'signalHandler' to avoid collision with other shared libs.
3327 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3328 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3329 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3330 if (AllowUserSignalHandlers || !set_installed) {
3331 // Do not overwrite; user takes responsibility to forward to us.
3332 return;
3333 } else if (UseSignalChaining) {
3334 // save the old handler in jvm
3335 save_preinstalled_handler(sig, oldAct);
3336 // libjsig also interposes the sigaction() call below and saves the
3337 // old sigaction on it own.
3338 } else {
3339 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3340 "%#lx for signal %d.", (long)oldhand, sig));
3341 }
3342 }
3343
3344 struct sigaction sigAct;
3345 sigfillset(&(sigAct.sa_mask));
3346 if (!set_installed) {
3347 sigAct.sa_handler = SIG_DFL;
3348 sigAct.sa_flags = SA_RESTART;
3349 } else {
3350 // Renamed 'signalHandler' to avoid collision with other shared libs.
3351 sigAct.sa_sigaction = javaSignalHandler;
3352 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3353 }
3354 // Save flags, which are set by ours
3355 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3356 sigflags[sig] = sigAct.sa_flags;
3357
3358 int ret = sigaction(sig, &sigAct, &oldAct);
3359 assert(ret == 0, "check");
3360
3361 void* oldhand2 = oldAct.sa_sigaction
3362 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3363 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3364 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3365 }
3366
3367 // install signal handlers for signals that HotSpot needs to
3368 // handle in order to support Java-level exception handling.
3369 void os::Aix::install_signal_handlers() {
3370 if (!signal_handlers_are_installed) {
3371 signal_handlers_are_installed = true;
3372
3373 // signal-chaining
3374 typedef void (*signal_setting_t)();
3375 signal_setting_t begin_signal_setting = NULL;
3376 signal_setting_t end_signal_setting = NULL;
3377 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3378 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3379 if (begin_signal_setting != NULL) {
3380 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3381 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3382 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3383 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3384 libjsig_is_loaded = true;
3385 assert(UseSignalChaining, "should enable signal-chaining");
3386 }
3387 if (libjsig_is_loaded) {
3388 // Tell libjsig jvm is setting signal handlers
3389 (*begin_signal_setting)();
3390 }
3391
3392 set_signal_handler(SIGSEGV, true);
3393 set_signal_handler(SIGPIPE, true);
3394 set_signal_handler(SIGBUS, true);
3395 set_signal_handler(SIGILL, true);
3396 set_signal_handler(SIGFPE, true);
3397 set_signal_handler(SIGTRAP, true);
3398 set_signal_handler(SIGXFSZ, true);
3399 set_signal_handler(SIGDANGER, true);
3400
3401 if (libjsig_is_loaded) {
3402 // Tell libjsig jvm finishes setting signal handlers
3403 (*end_signal_setting)();
3404 }
3405
3406 // We don't activate signal checker if libjsig is in place, we trust ourselves
3407 // and if UserSignalHandler is installed all bets are off.
3408 // Log that signal checking is off only if -verbose:jni is specified.
3409 if (CheckJNICalls) {
3410 if (libjsig_is_loaded) {
3411 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3412 check_signals = false;
3413 }
3414 if (AllowUserSignalHandlers) {
3415 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3416 check_signals = false;
3417 }
3418 // need to initialize check_signal_done
3419 ::sigemptyset(&check_signal_done);
3420 }
3421 }
3422 }
3423
3424 static const char* get_signal_handler_name(address handler,
3425 char* buf, int buflen) {
3426 int offset;
3427 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3428 if (found) {
3429 // skip directory names
3430 const char *p1, *p2;
3431 p1 = buf;
3432 size_t len = strlen(os::file_separator());
3433 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3434 // The way os::dll_address_to_library_name is implemented on Aix
3435 // right now, it always returns -1 for the offset which is not
3436 // terribly informative.
3437 // Will fix that. For now, omit the offset.
3438 jio_snprintf(buf, buflen, "%s", p1);
3439 } else {
3440 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3441 }
3442 return buf;
3443 }
3444
3445 static void print_signal_handler(outputStream* st, int sig,
3446 char* buf, size_t buflen) {
3447 struct sigaction sa;
3448 sigaction(sig, NULL, &sa);
3449
3450 st->print("%s: ", os::exception_name(sig, buf, buflen));
3451
3452 address handler = (sa.sa_flags & SA_SIGINFO)
3453 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3454 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3455
3456 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3457 st->print("SIG_DFL");
3458 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3459 st->print("SIG_IGN");
3460 } else {
3461 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3462 }
3463
3464 // Print readable mask.
3465 st->print(", sa_mask[0]=");
3466 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3467
3468 address rh = VMError::get_resetted_sighandler(sig);
3469 // May be, handler was resetted by VMError?
3470 if (rh != NULL) {
3471 handler = rh;
3472 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3473 }
3474
3475 // Print textual representation of sa_flags.
3476 st->print(", sa_flags=");
3477 os::Posix::print_sa_flags(st, sa.sa_flags);
3478
3479 // Check: is it our handler?
3480 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3481 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3482 // It is our signal handler.
3483 // Check for flags, reset system-used one!
3484 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3485 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3486 os::Aix::get_our_sigflags(sig));
3487 }
3488 }
3489 st->cr();
3490 }
3491
3492
3493 #define DO_SIGNAL_CHECK(sig) \
3494 if (!sigismember(&check_signal_done, sig)) \
3495 os::Aix::check_signal_handler(sig)
3496
3497 // This method is a periodic task to check for misbehaving JNI applications
3498 // under CheckJNI, we can add any periodic checks here
3499
3500 void os::run_periodic_checks() {
3501
3502 if (check_signals == false) return;
3503
3504 // SEGV and BUS if overridden could potentially prevent
3505 // generation of hs*.log in the event of a crash, debugging
3506 // such a case can be very challenging, so we absolutely
3507 // check the following for a good measure:
3508 DO_SIGNAL_CHECK(SIGSEGV);
3509 DO_SIGNAL_CHECK(SIGILL);
3510 DO_SIGNAL_CHECK(SIGFPE);
3511 DO_SIGNAL_CHECK(SIGBUS);
3512 DO_SIGNAL_CHECK(SIGPIPE);
3513 DO_SIGNAL_CHECK(SIGXFSZ);
3514 if (UseSIGTRAP) {
3515 DO_SIGNAL_CHECK(SIGTRAP);
3516 }
3517 DO_SIGNAL_CHECK(SIGDANGER);
3518
3519 // ReduceSignalUsage allows the user to override these handlers
3520 // see comments at the very top and jvm_solaris.h
3521 if (!ReduceSignalUsage) {
3522 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3523 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3524 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3525 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3526 }
3527
3528 DO_SIGNAL_CHECK(SR_signum);
3529 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3530 }
3531
3532 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3533
3534 static os_sigaction_t os_sigaction = NULL;
3535
3536 void os::Aix::check_signal_handler(int sig) {
3537 char buf[O_BUFLEN];
3538 address jvmHandler = NULL;
3539
3540 struct sigaction act;
3541 if (os_sigaction == NULL) {
3542 // only trust the default sigaction, in case it has been interposed
3543 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3544 if (os_sigaction == NULL) return;
3545 }
3546
3547 os_sigaction(sig, (struct sigaction*)NULL, &act);
3548
3549 address thisHandler = (act.sa_flags & SA_SIGINFO)
3550 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3551 : CAST_FROM_FN_PTR(address, act.sa_handler);
3552
3553
3554 switch(sig) {
3555 case SIGSEGV:
3556 case SIGBUS:
3557 case SIGFPE:
3558 case SIGPIPE:
3559 case SIGILL:
3560 case SIGXFSZ:
3561 // Renamed 'signalHandler' to avoid collision with other shared libs.
3562 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3563 break;
3564
3565 case SHUTDOWN1_SIGNAL:
3566 case SHUTDOWN2_SIGNAL:
3567 case SHUTDOWN3_SIGNAL:
3568 case BREAK_SIGNAL:
3569 jvmHandler = (address)user_handler();
3570 break;
3571
3572 case INTERRUPT_SIGNAL:
3573 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3574 break;
3575
3576 default:
3577 if (sig == SR_signum) {
3578 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3579 } else {
3580 return;
3581 }
3582 break;
3583 }
3584
3585 if (thisHandler != jvmHandler) {
3586 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3587 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3588 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3589 // No need to check this sig any longer
3590 sigaddset(&check_signal_done, sig);
3591 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3592 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3593 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3594 exception_name(sig, buf, O_BUFLEN));
3595 }
3596 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3597 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3598 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3599 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3600 // No need to check this sig any longer
3601 sigaddset(&check_signal_done, sig);
3602 }
3603
3604 // Dump all the signal
3605 if (sigismember(&check_signal_done, sig)) {
3606 print_signal_handlers(tty, buf, O_BUFLEN);
3607 }
3608 }
3609
3610 extern bool signal_name(int signo, char* buf, size_t len);
3611
3612 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3613 if (0 < exception_code && exception_code <= SIGRTMAX) {
3614 // signal
3615 if (!signal_name(exception_code, buf, size)) {
3616 jio_snprintf(buf, size, "SIG%d", exception_code);
3617 }
3618 return buf;
3619 } else {
3620 return NULL;
3621 }
3622 }
3623
3624 // To install functions for atexit system call
3625 extern "C" {
3626 static void perfMemory_exit_helper() {
3627 perfMemory_exit();
3628 }
3629 }
3630
3631 // This is called _before_ the most of global arguments have been parsed.
3632 void os::init(void) {
3633 // This is basic, we want to know if that ever changes.
3634 // (shared memory boundary is supposed to be a 256M aligned)
3635 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3636
3637 // First off, we need to know whether we run on AIX or PASE, and
3638 // the OS level we run on.
3639 os::Aix::initialize_os_info();
3640
3641 // Scan environment (SPEC1170 behaviour, etc)
3642 os::Aix::scan_environment();
3643
3644 // Check which pages are supported by AIX.
3645 os::Aix::query_multipage_support();
3646
3647 // Next, we need to initialize libo4 and libperfstat libraries.
3648 if (os::Aix::on_pase()) {
3649 os::Aix::initialize_libo4();
3650 } else {
3651 os::Aix::initialize_libperfstat();
3652 }
3653
3654 // Reset the perfstat information provided by ODM.
3655 if (os::Aix::on_aix()) {
3656 libperfstat::perfstat_reset();
3657 }
3658
3659 // Now initialze basic system properties. Note that for some of the values we
3660 // need libperfstat etc.
3661 os::Aix::initialize_system_info();
3662
3663 // Initialize large page support.
3664 if (UseLargePages) {
3665 os::large_page_init();
3666 if (!UseLargePages) {
3667 // initialize os::_page_sizes
3668 _page_sizes[0] = Aix::page_size();
3669 _page_sizes[1] = 0;
3670 if (Verbose) {
3671 fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n");
3672 }
3673 }
3674 } else {
3675 // initialize os::_page_sizes
3676 _page_sizes[0] = Aix::page_size();
3677 _page_sizes[1] = 0;
3678 }
3679
3680 // debug trace
3681 if (Verbose) {
3682 fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size());
3683 fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size());
3684 fprintf(stderr, "os::_page_sizes = ( ");
3685 for (int i = 0; _page_sizes[i]; i ++) {
3686 fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i]));
3687 }
3688 fprintf(stderr, ")\n");
3689 }
3690
3691 _initial_pid = getpid();
3692
3693 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3694
3695 init_random(1234567);
3696
3697 ThreadCritical::initialize();
3698
3699 // Main_thread points to the aboriginal thread.
3700 Aix::_main_thread = pthread_self();
3701
3702 initial_time_count = os::elapsed_counter();
3703 pthread_mutex_init(&dl_mutex, NULL);
3704 }
3705
3706 // this is called _after_ the global arguments have been parsed
3707 jint os::init_2(void) {
3708
3709 if (Verbose) {
3710 fprintf(stderr, "processor count: %d\n", os::_processor_count);
3711 fprintf(stderr, "physical memory: %lu\n", Aix::_physical_memory);
3712 }
3713
3714 // initially build up the loaded dll map
3715 LoadedLibraries::reload();
3716
3717 const int page_size = Aix::page_size();
3718 const int map_size = page_size;
3719
3720 address map_address = (address) MAP_FAILED;
3721 const int prot = PROT_READ;
3722 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3723
3724 // use optimized addresses for the polling page,
3725 // e.g. map it to a special 32-bit address.
3726 if (OptimizePollingPageLocation) {
3727 // architecture-specific list of address wishes:
3728 address address_wishes[] = {
3729 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3730 // PPC64: all address wishes are non-negative 32 bit values where
3731 // the lower 16 bits are all zero. we can load these addresses
3732 // with a single ppc_lis instruction.
3733 (address) 0x30000000, (address) 0x31000000,
3734 (address) 0x32000000, (address) 0x33000000,
3735 (address) 0x40000000, (address) 0x41000000,
3736 (address) 0x42000000, (address) 0x43000000,
3737 (address) 0x50000000, (address) 0x51000000,
3738 (address) 0x52000000, (address) 0x53000000,
3739 (address) 0x60000000, (address) 0x61000000,
3740 (address) 0x62000000, (address) 0x63000000
3741 };
3742 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3743
3744 // iterate over the list of address wishes:
3745 for (int i=0; i<address_wishes_length; i++) {
3746 // try to map with current address wish.
3747 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3748 // fail if the address is already mapped.
3749 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3750 map_size, prot,
3751 flags | MAP_FIXED,
3752 -1, 0);
3753 if (Verbose) {
3754 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3755 address_wishes[i], map_address + (ssize_t)page_size);
3756 }
3757
3758 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3759 // map succeeded and map_address is at wished address, exit loop.
3760 break;
3761 }
3762
3763 if (map_address != (address) MAP_FAILED) {
3764 // map succeeded, but polling_page is not at wished address, unmap and continue.
3765 ::munmap(map_address, map_size);
3766 map_address = (address) MAP_FAILED;
3767 }
3768 // map failed, continue loop.
3769 }
3770 } // end OptimizePollingPageLocation
3771
3772 if (map_address == (address) MAP_FAILED) {
3773 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3774 }
3775 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3776 os::set_polling_page(map_address);
3777
3778 if (!UseMembar) {
3779 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3780 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3781 os::set_memory_serialize_page(mem_serialize_page);
3782
3783 #ifndef PRODUCT
3784 if (Verbose && PrintMiscellaneous)
3785 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3786 #endif
3787 }
3788
3789 // initialize suspend/resume support - must do this before signal_sets_init()
3790 if (SR_initialize() != 0) {
3791 perror("SR_initialize failed");
3792 return JNI_ERR;
3793 }
3794
3795 Aix::signal_sets_init();
3796 Aix::install_signal_handlers();
3797
3798 // Check minimum allowable stack size for thread creation and to initialize
3799 // the java system classes, including StackOverflowError - depends on page
3800 // size. Add a page for compiler2 recursion in main thread.
3801 // Add in 2*BytesPerWord times page size to account for VM stack during
3802 // class initialization depending on 32 or 64 bit VM.
3803 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3804 (size_t)(StackYellowPages+StackRedPages+StackShadowPages +
3805 2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size());
3806
3807 size_t threadStackSizeInBytes = ThreadStackSize * K;
3808 if (threadStackSizeInBytes != 0 &&
3809 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3810 tty->print_cr("\nThe stack size specified is too small, "
3811 "Specify at least %dk",
3812 os::Aix::min_stack_allowed / K);
3813 return JNI_ERR;
3814 }
3815
3816 // Make the stack size a multiple of the page size so that
3817 // the yellow/red zones can be guarded.
3818 // note that this can be 0, if no default stacksize was set
3819 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3820
3821 Aix::libpthread_init();
3822
3823 if (MaxFDLimit) {
3824 // set the number of file descriptors to max. print out error
3825 // if getrlimit/setrlimit fails but continue regardless.
3826 struct rlimit nbr_files;
3827 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3828 if (status != 0) {
3829 if (PrintMiscellaneous && (Verbose || WizardMode))
3830 perror("os::init_2 getrlimit failed");
3831 } else {
3832 nbr_files.rlim_cur = nbr_files.rlim_max;
3833 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3834 if (status != 0) {
3835 if (PrintMiscellaneous && (Verbose || WizardMode))
3836 perror("os::init_2 setrlimit failed");
3837 }
3838 }
3839 }
3840
3841 if (PerfAllowAtExitRegistration) {
3842 // only register atexit functions if PerfAllowAtExitRegistration is set.
3843 // atexit functions can be delayed until process exit time, which
3844 // can be problematic for embedded VM situations. Embedded VMs should
3845 // call DestroyJavaVM() to assure that VM resources are released.
3846
3847 // note: perfMemory_exit_helper atexit function may be removed in
3848 // the future if the appropriate cleanup code can be added to the
3849 // VM_Exit VMOperation's doit method.
3850 if (atexit(perfMemory_exit_helper) != 0) {
3851 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3852 }
3853 }
3854
3855 return JNI_OK;
3856 }
3857
3858 // this is called at the end of vm_initialization
3859 void os::init_3(void) {
3860 return;
3861 }
3862
3863 // Mark the polling page as unreadable
3864 void os::make_polling_page_unreadable(void) {
3865 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3866 fatal("Could not disable polling page");
3867 }
3868 };
3869
3870 // Mark the polling page as readable
3871 void os::make_polling_page_readable(void) {
3872 // Changed according to os_linux.cpp.
3873 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3874 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
3875 }
3876 };
3877
3878 int os::active_processor_count() {
3879 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3880 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3881 return online_cpus;
3882 }
3883
3884 void os::set_native_thread_name(const char *name) {
3885 // Not yet implemented.
3886 return;
3887 }
3888
3889 bool os::distribute_processes(uint length, uint* distribution) {
3890 // Not yet implemented.
3891 return false;
3892 }
3893
3894 bool os::bind_to_processor(uint processor_id) {
3895 // Not yet implemented.
3896 return false;
3897 }
3898
3899 void os::SuspendedThreadTask::internal_do_task() {
3900 if (do_suspend(_thread->osthread())) {
3901 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3902 do_task(context);
3903 do_resume(_thread->osthread());
3904 }
3905 }
3906
3907 class PcFetcher : public os::SuspendedThreadTask {
3908 public:
3909 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3910 ExtendedPC result();
3911 protected:
3912 void do_task(const os::SuspendedThreadTaskContext& context);
3913 private:
3914 ExtendedPC _epc;
3915 };
3916
3917 ExtendedPC PcFetcher::result() {
3918 guarantee(is_done(), "task is not done yet.");
3919 return _epc;
3920 }
3921
3922 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3923 Thread* thread = context.thread();
3924 OSThread* osthread = thread->osthread();
3925 if (osthread->ucontext() != NULL) {
3926 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3927 } else {
3928 // NULL context is unexpected, double-check this is the VMThread.
3929 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3930 }
3931 }
3932
3933 // Suspends the target using the signal mechanism and then grabs the PC before
3934 // resuming the target. Used by the flat-profiler only
3935 ExtendedPC os::get_thread_pc(Thread* thread) {
3936 // Make sure that it is called by the watcher for the VMThread.
3937 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3938 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3939
3940 PcFetcher fetcher(thread);
3941 fetcher.run();
3942 return fetcher.result();
3943 }
3944
3945 // Not neede on Aix.
3946 // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) {
3947 // }
3948
3949 ////////////////////////////////////////////////////////////////////////////////
3950 // debug support
3951
3952 static address same_page(address x, address y) {
3953 intptr_t page_bits = -os::vm_page_size();
3954 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3955 return x;
3956 else if (x > y)
3957 return (address)(intptr_t(y) | ~page_bits) + 1;
3958 else
3959 return (address)(intptr_t(y) & page_bits);
3960 }
3961
3962 bool os::find(address addr, outputStream* st) {
3963
3964 st->print(PTR_FORMAT ": ", addr);
3965
3966 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3967 if (lib) {
3968 lib->print(st);
3969 return true;
3970 } else {
3971 lib = LoadedLibraries::find_for_data_address(addr);
3972 if (lib) {
3973 lib->print(st);
3974 return true;
3975 } else {
3976 st->print_cr("(outside any module)");
3977 }
3978 }
3979
3980 return false;
3981 }
3982
3983 ////////////////////////////////////////////////////////////////////////////////
3984 // misc
3985
3986 // This does not do anything on Aix. This is basically a hook for being
3987 // able to use structured exception handling (thread-local exception filters)
3988 // on, e.g., Win32.
3989 void
3990 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3991 JavaCallArguments* args, Thread* thread) {
3992 f(value, method, args, thread);
3993 }
3994
3995 void os::print_statistics() {
3996 }
3997
3998 int os::message_box(const char* title, const char* message) {
3999 int i;
4000 fdStream err(defaultStream::error_fd());
4001 for (i = 0; i < 78; i++) err.print_raw("=");
4002 err.cr();
4003 err.print_raw_cr(title);
4004 for (i = 0; i < 78; i++) err.print_raw("-");
4005 err.cr();
4006 err.print_raw_cr(message);
4007 for (i = 0; i < 78; i++) err.print_raw("=");
4008 err.cr();
4009
4010 char buf[16];
4011 // Prevent process from exiting upon "read error" without consuming all CPU
4012 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
4013
4014 return buf[0] == 'y' || buf[0] == 'Y';
4015 }
4016
4017 int os::stat(const char *path, struct stat *sbuf) {
4018 char pathbuf[MAX_PATH];
4019 if (strlen(path) > MAX_PATH - 1) {
4020 errno = ENAMETOOLONG;
4021 return -1;
4022 }
4023 os::native_path(strcpy(pathbuf, path));
4024 return ::stat(pathbuf, sbuf);
4025 }
4026
4027 bool os::check_heap(bool force) {
4028 return true;
4029 }
4030
4031 // int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
4032 // return ::vsnprintf(buf, count, format, args);
4033 // }
4034
4035 // Is a (classpath) directory empty?
4036 bool os::dir_is_empty(const char* path) {
4037 DIR *dir = NULL;
4038 struct dirent *ptr;
4039
4040 dir = opendir(path);
4041 if (dir == NULL) return true;
4042
4043 /* Scan the directory */
4044 bool result = true;
4045 char buf[sizeof(struct dirent) + MAX_PATH];
4046 while (result && (ptr = ::readdir(dir)) != NULL) {
4047 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4048 result = false;
4049 }
4050 }
4051 closedir(dir);
4052 return result;
4053 }
4054
4055 // This code originates from JDK's sysOpen and open64_w
4056 // from src/solaris/hpi/src/system_md.c
4057
4058 #ifndef O_DELETE
4059 #define O_DELETE 0x10000
4060 #endif
4061
4062 // Open a file. Unlink the file immediately after open returns
4063 // if the specified oflag has the O_DELETE flag set.
4064 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
4065
4066 int os::open(const char *path, int oflag, int mode) {
4067
4068 if (strlen(path) > MAX_PATH - 1) {
4069 errno = ENAMETOOLONG;
4070 return -1;
4071 }
4072 int fd;
4073 int o_delete = (oflag & O_DELETE);
4074 oflag = oflag & ~O_DELETE;
4075
4076 fd = ::open64(path, oflag, mode);
4077 if (fd == -1) return -1;
4078
4079 // If the open succeeded, the file might still be a directory.
4080 {
4081 struct stat64 buf64;
4082 int ret = ::fstat64(fd, &buf64);
4083 int st_mode = buf64.st_mode;
4084
4085 if (ret != -1) {
4086 if ((st_mode & S_IFMT) == S_IFDIR) {
4087 errno = EISDIR;
4088 ::close(fd);
4089 return -1;
4090 }
4091 } else {
4092 ::close(fd);
4093 return -1;
4094 }
4095 }
4096
4097 // All file descriptors that are opened in the JVM and not
4098 // specifically destined for a subprocess should have the
4099 // close-on-exec flag set. If we don't set it, then careless 3rd
4100 // party native code might fork and exec without closing all
4101 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4102 // UNIXProcess.c), and this in turn might:
4103 //
4104 // - cause end-of-file to fail to be detected on some file
4105 // descriptors, resulting in mysterious hangs, or
4106 //
4107 // - might cause an fopen in the subprocess to fail on a system
4108 // suffering from bug 1085341.
4109 //
4110 // (Yes, the default setting of the close-on-exec flag is a Unix
4111 // design flaw.)
4112 //
4113 // See:
4114 // 1085341: 32-bit stdio routines should support file descriptors >255
4115 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4116 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4117 #ifdef FD_CLOEXEC
4118 {
4119 int flags = ::fcntl(fd, F_GETFD);
4120 if (flags != -1)
4121 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4122 }
4123 #endif
4124
4125 if (o_delete != 0) {
4126 ::unlink(path);
4127 }
4128 return fd;
4129 }
4130
4131
4132 // create binary file, rewriting existing file if required
4133 int os::create_binary_file(const char* path, bool rewrite_existing) {
4134 int oflags = O_WRONLY | O_CREAT;
4135 if (!rewrite_existing) {
4136 oflags |= O_EXCL;
4137 }
4138 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4139 }
4140
4141 // return current position of file pointer
4142 jlong os::current_file_offset(int fd) {
4143 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4144 }
4145
4146 // move file pointer to the specified offset
4147 jlong os::seek_to_file_offset(int fd, jlong offset) {
4148 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4149 }
4150
4151 // This code originates from JDK's sysAvailable
4152 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4153
4154 int os::available(int fd, jlong *bytes) {
4155 jlong cur, end;
4156 int mode;
4157 struct stat64 buf64;
4158
4159 if (::fstat64(fd, &buf64) >= 0) {
4160 mode = buf64.st_mode;
4161 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4162 // XXX: is the following call interruptible? If so, this might
4163 // need to go through the INTERRUPT_IO() wrapper as for other
4164 // blocking, interruptible calls in this file.
4165 int n;
4166 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4167 *bytes = n;
4168 return 1;
4169 }
4170 }
4171 }
4172 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4173 return 0;
4174 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4175 return 0;
4176 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4177 return 0;
4178 }
4179 *bytes = end - cur;
4180 return 1;
4181 }
4182
4183 int os::socket_available(int fd, jint *pbytes) {
4184 // Linux doc says EINTR not returned, unlike Solaris
4185 int ret = ::ioctl(fd, FIONREAD, pbytes);
4186
4187 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
4188 // is expected to return 0 on failure and 1 on success to the jdk.
4189 return (ret < 0) ? 0 : 1;
4190 }
4191
4192 // Map a block of memory.
4193 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4194 char *addr, size_t bytes, bool read_only,
4195 bool allow_exec) {
4196 Unimplemented();
4197 return NULL;
4198 }
4199
4200
4201 // Remap a block of memory.
4202 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4203 char *addr, size_t bytes, bool read_only,
4204 bool allow_exec) {
4205 // same as map_memory() on this OS
4206 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4207 allow_exec);
4208 }
4209
4210 // Unmap a block of memory.
4211 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4212 return munmap(addr, bytes) == 0;
4213 }
4214
4215 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4216 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4217 // of a thread.
4218 //
4219 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4220 // the fast estimate available on the platform.
4221
4222 jlong os::current_thread_cpu_time() {
4223 // return user + sys since the cost is the same
4224 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4225 assert(n >= 0, "negative CPU time");
4226 return n;
4227 }
4228
4229 jlong os::thread_cpu_time(Thread* thread) {
4230 // consistent with what current_thread_cpu_time() returns
4231 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4232 assert(n >= 0, "negative CPU time");
4233 return n;
4234 }
4235
4236 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4237 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4238 assert(n >= 0, "negative CPU time");
4239 return n;
4240 }
4241
4242 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4243 bool error = false;
4244
4245 jlong sys_time = 0;
4246 jlong user_time = 0;
4247
4248 // reimplemented using getthrds64().
4249 //
4250 // goes like this:
4251 // For the thread in question, get the kernel thread id. Then get the
4252 // kernel thread statistics using that id.
4253 //
4254 // This only works of course when no pthread scheduling is used,
4255 // ie there is a 1:1 relationship to kernel threads.
4256 // On AIX, see AIXTHREAD_SCOPE variable.
4257
4258 pthread_t pthtid = thread->osthread()->pthread_id();
4259
4260 // retrieve kernel thread id for the pthread:
4261 tid64_t tid = 0;
4262 struct __pthrdsinfo pinfo;
4263 // I just love those otherworldly IBM APIs which force me to hand down
4264 // dummy buffers for stuff I dont care for...
4265 char dummy[1];
4266 int dummy_size = sizeof(dummy);
4267 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4268 dummy, &dummy_size) == 0) {
4269 tid = pinfo.__pi_tid;
4270 } else {
4271 tty->print_cr("pthread_getthrds_np failed.");
4272 error = true;
4273 }
4274
4275 // retrieve kernel timing info for that kernel thread
4276 if (!error) {
4277 struct thrdentry64 thrdentry;
4278 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4279 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4280 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4281 } else {
4282 tty->print_cr("pthread_getthrds_np failed.");
4283 error = true;
4284 }
4285 }
4286
4287 if (p_sys_time) {
4288 *p_sys_time = sys_time;
4289 }
4290
4291 if (p_user_time) {
4292 *p_user_time = user_time;
4293 }
4294
4295 if (error) {
4296 return false;
4297 }
4298
4299 return true;
4300 }
4301
4302 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4303 jlong sys_time;
4304 jlong user_time;
4305
4306 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4307 return -1;
4308 }
4309
4310 return user_sys_cpu_time ? sys_time + user_time : user_time;
4311 }
4312
4313 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4314 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4315 info_ptr->may_skip_backward = false; // elapsed time not wall time
4316 info_ptr->may_skip_forward = false; // elapsed time not wall time
4317 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4318 }
4319
4320 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4321 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4322 info_ptr->may_skip_backward = false; // elapsed time not wall time
4323 info_ptr->may_skip_forward = false; // elapsed time not wall time
4324 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4325 }
4326
4327 bool os::is_thread_cpu_time_supported() {
4328 return true;
4329 }
4330
4331 // System loadavg support. Returns -1 if load average cannot be obtained.
4332 // For now just return the system wide load average (no processor sets).
4333 int os::loadavg(double values[], int nelem) {
4334
4335 // Implemented using libperfstat on AIX.
4336
4337 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4338 guarantee(values, "argument error");
4339
4340 if (os::Aix::on_pase()) {
4341 Unimplemented();
4342 return -1;
4343 } else {
4344 // AIX: use libperfstat
4345 //
4346 // See also:
4347 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4348 // /usr/include/libperfstat.h:
4349
4350 // Use the already AIX version independent get_cpuinfo.
4351 os::Aix::cpuinfo_t ci;
4352 if (os::Aix::get_cpuinfo(&ci)) {
4353 for (int i = 0; i < nelem; i++) {
4354 values[i] = ci.loadavg[i];
4355 }
4356 } else {
4357 return -1;
4358 }
4359 return nelem;
4360 }
4361 }
4362
4363 void os::pause() {
4364 char filename[MAX_PATH];
4365 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4366 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4367 } else {
4368 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4369 }
4370
4371 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4372 if (fd != -1) {
4373 struct stat buf;
4374 ::close(fd);
4375 while (::stat(filename, &buf) == 0) {
4376 (void)::poll(NULL, 0, 100);
4377 }
4378 } else {
4379 jio_fprintf(stderr,
4380 "Could not open pause file '%s', continuing immediately.\n", filename);
4381 }
4382 }
4383
4384 bool os::Aix::is_primordial_thread() {
4385 if (pthread_self() == (pthread_t)1) {
4386 return true;
4387 } else {
4388 return false;
4389 }
4390 }
4391
4392 // OS recognitions (PASE/AIX, OS level) call this before calling any
4393 // one of Aix::on_pase(), Aix::os_version() static
4394 void os::Aix::initialize_os_info() {
4395
4396 assert(_on_pase == -1 && _os_version == -1, "already called.");
4397
4398 struct utsname uts;
4399 memset(&uts, 0, sizeof(uts));
4400 strcpy(uts.sysname, "?");
4401 if (::uname(&uts) == -1) {
4402 fprintf(stderr, "uname failed (%d)\n", errno);
4403 guarantee(0, "Could not determine whether we run on AIX or PASE");
4404 } else {
4405 if (Verbose) {
4406 fprintf(stderr,"uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4407 "node \"%s\" machine \"%s\"\n",
4408 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4409 }
4410 const int major = atoi(uts.version);
4411 assert(major > 0, "invalid OS version");
4412 const int minor = atoi(uts.release);
4413 assert(minor > 0, "invalid OS release");
4414 _os_version = (major << 8) | minor;
4415 if (strcmp(uts.sysname, "OS400") == 0) {
4416 Unimplemented();
4417 } else if (strcmp(uts.sysname, "AIX") == 0) {
4418 // We run on AIX. We do not support versions older than AIX 5.3.
4419 _on_pase = 0;
4420 if (_os_version < 0x0503) {
4421 fprintf(stderr, "AIX release older than AIX 5.3 not supported.\n");
4422 assert(false, "AIX release too old.");
4423 } else {
4424 if (Verbose) {
4425 fprintf(stderr, "We run on AIX %d.%d\n", major, minor);
4426 }
4427 }
4428 } else {
4429 assert(false, "unknown OS");
4430 }
4431 }
4432
4433 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4434
4435 } // end: os::Aix::initialize_os_info()
4436
4437 // Scan environment for important settings which might effect the VM.
4438 // Trace out settings. Warn about invalid settings and/or correct them.
4439 //
4440 // Must run after os::Aix::initialue_os_info().
4441 void os::Aix::scan_environment() {
4442
4443 char* p;
4444 int rc;
4445
4446 // Warn explicity if EXTSHM=ON is used. That switch changes how
4447 // System V shared memory behaves. One effect is that page size of
4448 // shared memory cannot be change dynamically, effectivly preventing
4449 // large pages from working.
4450 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4451 // recommendation is (in OSS notes) to switch it off.
4452 p = ::getenv("EXTSHM");
4453 if (Verbose) {
4454 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4455 }
4456 if (p && strcmp(p, "ON") == 0) {
4457 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4458 _extshm = 1;
4459 } else {
4460 _extshm = 0;
4461 }
4462
4463 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4464 // Not tested, not supported.
4465 //
4466 // Note that it might be worth the trouble to test and to require it, if only to
4467 // get useful return codes for mprotect.
4468 //
4469 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4470 // exec() ? before loading the libjvm ? ....)
4471 p = ::getenv("XPG_SUS_ENV");
4472 if (Verbose) {
4473 fprintf(stderr, "XPG_SUS_ENV=%s.\n", p ? p : "<unset>");
4474 }
4475 if (p && strcmp(p, "ON") == 0) {
4476 _xpg_sus_mode = 1;
4477 fprintf(stderr, "Unsupported setting: XPG_SUS_ENV=ON\n");
4478 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4479 // clobber address ranges. If we ever want to support that, we have to do some
4480 // testing first.
4481 guarantee(false, "XPG_SUS_ENV=ON not supported");
4482 } else {
4483 _xpg_sus_mode = 0;
4484 }
4485
4486 // Switch off AIX internal (pthread) guard pages. This has
4487 // immediate effect for any pthread_create calls which follow.
4488 p = ::getenv("AIXTHREAD_GUARDPAGES");
4489 if (Verbose) {
4490 fprintf(stderr, "AIXTHREAD_GUARDPAGES=%s.\n", p ? p : "<unset>");
4491 fprintf(stderr, "setting AIXTHREAD_GUARDPAGES=0.\n");
4492 }
4493 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4494 guarantee(rc == 0, "");
4495
4496 } // end: os::Aix::scan_environment()
4497
4498 // PASE: initialize the libo4 library (AS400 PASE porting library).
4499 void os::Aix::initialize_libo4() {
4500 Unimplemented();
4501 }
4502
4503 // AIX: initialize the libperfstat library (we load this dynamically
4504 // because it is only available on AIX.
4505 void os::Aix::initialize_libperfstat() {
4506
4507 assert(os::Aix::on_aix(), "AIX only");
4508
4509 if (!libperfstat::init()) {
4510 fprintf(stderr, "libperfstat initialization failed.\n");
4511 assert(false, "libperfstat initialization failed");
4512 } else {
4513 if (Verbose) {
4514 fprintf(stderr, "libperfstat initialized.\n");
4515 }
4516 }
4517 } // end: os::Aix::initialize_libperfstat
4518
4519 /////////////////////////////////////////////////////////////////////////////
4520 // thread stack
4521
4522 // function to query the current stack size using pthread_getthrds_np
4523 //
4524 // ! do not change anything here unless you know what you are doing !
4525 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4526
4527 // This only works when invoked on a pthread. As we agreed not to use
4528 // primordial threads anyway, I assert here
4529 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4530
4531 // information about this api can be found (a) in the pthread.h header and
4532 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4533 //
4534 // The use of this API to find out the current stack is kind of undefined.
4535 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4536 // enough for cases where I let the pthread library create its stacks. For cases
4537 // where I create an own stack and pass this to pthread_create, it seems not to
4538 // work (the returned stack size in that case is 0).
4539
4540 pthread_t tid = pthread_self();
4541 struct __pthrdsinfo pinfo;
4542 char dummy[1]; // we only need this to satisfy the api and to not get E
4543 int dummy_size = sizeof(dummy);
4544
4545 memset(&pinfo, 0, sizeof(pinfo));
4546
4547 const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4548 sizeof(pinfo), dummy, &dummy_size);
4549
4550 if (rc != 0) {
4551 fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc);
4552 guarantee(0, "pthread_getthrds_np failed");
4553 }
4554
4555 guarantee(pinfo.__pi_stackend, "returned stack base invalid");
4556
4557 // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack
4558 // (when handing down a stack to pthread create, see pthread_attr_setstackaddr).
4559 // Not sure what to do here - I feel inclined to forbid this use case completely.
4560 guarantee(pinfo.__pi_stacksize, "returned stack size invalid");
4561
4562 // On AIX, stacks are not necessarily page aligned so round the base and size accordingly
4563 if (p_stack_base) {
4564 (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size());
4565 }
4566
4567 if (p_stack_size) {
4568 (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size();
4569 }
4570
4571 #ifndef PRODUCT
4572 if (Verbose) {
4573 fprintf(stderr,
4574 "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT
4575 ", real stack_size=" INTPTR_FORMAT
4576 ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n",
4577 (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize,
4578 (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()),
4579 pinfo.__pi_stacksize - os::Aix::stack_page_size());
4580 }
4581 #endif
4582
4583 } // end query_stack_dimensions
4584
4585 // get the current stack base from the OS (actually, the pthread library)
4586 address os::current_stack_base() {
4587 address p;
4588 query_stack_dimensions(&p, 0);
4589 return p;
4590 }
4591
4592 // get the current stack size from the OS (actually, the pthread library)
4593 size_t os::current_stack_size() {
4594 size_t s;
4595 query_stack_dimensions(0, &s);
4596 return s;
4597 }
4598
4599 // Refer to the comments in os_solaris.cpp park-unpark.
4600 //
4601 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4602 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4603 // For specifics regarding the bug see GLIBC BUGID 261237 :
4604 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4605 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4606 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4607 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4608 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4609 // and monitorenter when we're using 1-0 locking. All those operations may result in
4610 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4611 // of libpthread avoids the problem, but isn't practical.
4612 //
4613 // Possible remedies:
4614 //
4615 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4616 // This is palliative and probabilistic, however. If the thread is preempted
4617 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4618 // than the minimum period may have passed, and the abstime may be stale (in the
4619 // past) resultin in a hang. Using this technique reduces the odds of a hang
4620 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4621 //
4622 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4623 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4624 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4625 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4626 // thread.
4627 //
4628 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4629 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4630 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4631 // This also works well. In fact it avoids kernel-level scalability impediments
4632 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4633 // timers in a graceful fashion.
4634 //
4635 // 4. When the abstime value is in the past it appears that control returns
4636 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4637 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4638 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4639 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4640 // It may be possible to avoid reinitialization by checking the return
4641 // value from pthread_cond_timedwait(). In addition to reinitializing the
4642 // condvar we must establish the invariant that cond_signal() is only called
4643 // within critical sections protected by the adjunct mutex. This prevents
4644 // cond_signal() from "seeing" a condvar that's in the midst of being
4645 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4646 // desirable signal-after-unlock optimization that avoids futile context switching.
4647 //
4648 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4649 // structure when a condvar is used or initialized. cond_destroy() would
4650 // release the helper structure. Our reinitialize-after-timedwait fix
4651 // put excessive stress on malloc/free and locks protecting the c-heap.
4652 //
4653 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4654 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4655 // and only enabling the work-around for vulnerable environments.
4656
4657 // utility to compute the abstime argument to timedwait:
4658 // millis is the relative timeout time
4659 // abstime will be the absolute timeout time
4660 // TODO: replace compute_abstime() with unpackTime()
4661
4662 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4663 if (millis < 0) millis = 0;
4664 struct timeval now;
4665 int status = gettimeofday(&now, NULL);
4666 assert(status == 0, "gettimeofday");
4667 jlong seconds = millis / 1000;
4668 millis %= 1000;
4669 if (seconds > 50000000) { // see man cond_timedwait(3T)
4670 seconds = 50000000;
4671 }
4672 abstime->tv_sec = now.tv_sec + seconds;
4673 long usec = now.tv_usec + millis * 1000;
4674 if (usec >= 1000000) {
4675 abstime->tv_sec += 1;
4676 usec -= 1000000;
4677 }
4678 abstime->tv_nsec = usec * 1000;
4679 return abstime;
4680 }
4681
4682
4683 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4684 // Conceptually TryPark() should be equivalent to park(0).
4685
4686 int os::PlatformEvent::TryPark() {
4687 for (;;) {
4688 const int v = _Event;
4689 guarantee ((v == 0) || (v == 1), "invariant");
4690 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4691 }
4692 }
4693
4694 void os::PlatformEvent::park() { // AKA "down()"
4695 // Invariant: Only the thread associated with the Event/PlatformEvent
4696 // may call park().
4697 // TODO: assert that _Assoc != NULL or _Assoc == Self
4698 int v;
4699 for (;;) {
4700 v = _Event;
4701 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4702 }
4703 guarantee (v >= 0, "invariant");
4704 if (v == 0) {
4705 // Do this the hard way by blocking ...
4706 int status = pthread_mutex_lock(_mutex);
4707 assert_status(status == 0, status, "mutex_lock");
4708 guarantee (_nParked == 0, "invariant");
4709 ++ _nParked;
4710 while (_Event < 0) {
4711 status = pthread_cond_wait(_cond, _mutex);
4712 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4713 }
4714 -- _nParked;
4715
4716 // In theory we could move the ST of 0 into _Event past the unlock(),
4717 // but then we'd need a MEMBAR after the ST.
4718 _Event = 0;
4719 status = pthread_mutex_unlock(_mutex);
4720 assert_status(status == 0, status, "mutex_unlock");
4721 }
4722 guarantee (_Event >= 0, "invariant");
4723 }
4724
4725 int os::PlatformEvent::park(jlong millis) {
4726 guarantee (_nParked == 0, "invariant");
4727
4728 int v;
4729 for (;;) {
4730 v = _Event;
4731 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4732 }
4733 guarantee (v >= 0, "invariant");
4734 if (v != 0) return OS_OK;
4735
4736 // We do this the hard way, by blocking the thread.
4737 // Consider enforcing a minimum timeout value.
4738 struct timespec abst;
4739 compute_abstime(&abst, millis);
4740
4741 int ret = OS_TIMEOUT;
4742 int status = pthread_mutex_lock(_mutex);
4743 assert_status(status == 0, status, "mutex_lock");
4744 guarantee (_nParked == 0, "invariant");
4745 ++_nParked;
4746
4747 // Object.wait(timo) will return because of
4748 // (a) notification
4749 // (b) timeout
4750 // (c) thread.interrupt
4751 //
4752 // Thread.interrupt and object.notify{All} both call Event::set.
4753 // That is, we treat thread.interrupt as a special case of notification.
4754 // The underlying Solaris implementation, cond_timedwait, admits
4755 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4756 // JVM from making those visible to Java code. As such, we must
4757 // filter out spurious wakeups. We assume all ETIME returns are valid.
4758 //
4759 // TODO: properly differentiate simultaneous notify+interrupt.
4760 // In that case, we should propagate the notify to another waiter.
4761
4762 while (_Event < 0) {
4763 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4764 assert_status(status == 0 || status == ETIMEDOUT,
4765 status, "cond_timedwait");
4766 if (!FilterSpuriousWakeups) break; // previous semantics
4767 if (status == ETIMEDOUT) break;
4768 // We consume and ignore EINTR and spurious wakeups.
4769 }
4770 --_nParked;
4771 if (_Event >= 0) {
4772 ret = OS_OK;
4773 }
4774 _Event = 0;
4775 status = pthread_mutex_unlock(_mutex);
4776 assert_status(status == 0, status, "mutex_unlock");
4777 assert (_nParked == 0, "invariant");
4778 return ret;
4779 }
4780
4781 void os::PlatformEvent::unpark() {
4782 int v, AnyWaiters;
4783 for (;;) {
4784 v = _Event;
4785 if (v > 0) {
4786 // The LD of _Event could have reordered or be satisfied
4787 // by a read-aside from this processor's write buffer.
4788 // To avoid problems execute a barrier and then
4789 // ratify the value.
4790 OrderAccess::fence();
4791 if (_Event == v) return;
4792 continue;
4793 }
4794 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4795 }
4796 if (v < 0) {
4797 // Wait for the thread associated with the event to vacate
4798 int status = pthread_mutex_lock(_mutex);
4799 assert_status(status == 0, status, "mutex_lock");
4800 AnyWaiters = _nParked;
4801
4802 if (AnyWaiters != 0) {
4803 // We intentional signal *after* dropping the lock
4804 // to avoid a common class of futile wakeups.
4805 status = pthread_cond_signal(_cond);
4806 assert_status(status == 0, status, "cond_signal");
4807 }
4808 // Mutex should be locked for pthread_cond_signal(_cond).
4809 status = pthread_mutex_unlock(_mutex);
4810 assert_status(status == 0, status, "mutex_unlock");
4811 }
4812
4813 // Note that we signal() _after dropping the lock for "immortal" Events.
4814 // This is safe and avoids a common class of futile wakeups. In rare
4815 // circumstances this can cause a thread to return prematurely from
4816 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4817 // simply re-test the condition and re-park itself.
4818 }
4819
4820
4821 // JSR166
4822 // -------------------------------------------------------
4823
4824 //
4825 // The solaris and linux implementations of park/unpark are fairly
4826 // conservative for now, but can be improved. They currently use a
4827 // mutex/condvar pair, plus a a count.
4828 // Park decrements count if > 0, else does a condvar wait. Unpark
4829 // sets count to 1 and signals condvar. Only one thread ever waits
4830 // on the condvar. Contention seen when trying to park implies that someone
4831 // is unparking you, so don't wait. And spurious returns are fine, so there
4832 // is no need to track notifications.
4833 //
4834
4835 #define MAX_SECS 100000000
4836 //
4837 // This code is common to linux and solaris and will be moved to a
4838 // common place in dolphin.
4839 //
4840 // The passed in time value is either a relative time in nanoseconds
4841 // or an absolute time in milliseconds. Either way it has to be unpacked
4842 // into suitable seconds and nanoseconds components and stored in the
4843 // given timespec structure.
4844 // Given time is a 64-bit value and the time_t used in the timespec is only
4845 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4846 // overflow if times way in the future are given. Further on Solaris versions
4847 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4848 // number of seconds, in abstime, is less than current_time + 100,000,000.
4849 // As it will be 28 years before "now + 100000000" will overflow we can
4850 // ignore overflow and just impose a hard-limit on seconds using the value
4851 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4852 // years from "now".
4853 //
4854
4855 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4856 assert (time > 0, "convertTime");
4857
4858 struct timeval now;
4859 int status = gettimeofday(&now, NULL);
4860 assert(status == 0, "gettimeofday");
4861
4862 time_t max_secs = now.tv_sec + MAX_SECS;
4863
4864 if (isAbsolute) {
4865 jlong secs = time / 1000;
4866 if (secs > max_secs) {
4867 absTime->tv_sec = max_secs;
4868 }
4869 else {
4870 absTime->tv_sec = secs;
4871 }
4872 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4873 }
4874 else {
4875 jlong secs = time / NANOSECS_PER_SEC;
4876 if (secs >= MAX_SECS) {
4877 absTime->tv_sec = max_secs;
4878 absTime->tv_nsec = 0;
4879 }
4880 else {
4881 absTime->tv_sec = now.tv_sec + secs;
4882 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4883 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4884 absTime->tv_nsec -= NANOSECS_PER_SEC;
4885 ++absTime->tv_sec; // note: this must be <= max_secs
4886 }
4887 }
4888 }
4889 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4890 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4891 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4892 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4893 }
4894
4895 void Parker::park(bool isAbsolute, jlong time) {
4896 // Optional fast-path check:
4897 // Return immediately if a permit is available.
4898 if (_counter > 0) {
4899 _counter = 0;
4900 OrderAccess::fence();
4901 return;
4902 }
4903
4904 Thread* thread = Thread::current();
4905 assert(thread->is_Java_thread(), "Must be JavaThread");
4906 JavaThread *jt = (JavaThread *)thread;
4907
4908 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4909 // Check interrupt before trying to wait
4910 if (Thread::is_interrupted(thread, false)) {
4911 return;
4912 }
4913
4914 // Next, demultiplex/decode time arguments
4915 timespec absTime;
4916 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4917 return;
4918 }
4919 if (time > 0) {
4920 unpackTime(&absTime, isAbsolute, time);
4921 }
4922
4923
4924 // Enter safepoint region
4925 // Beware of deadlocks such as 6317397.
4926 // The per-thread Parker:: mutex is a classic leaf-lock.
4927 // In particular a thread must never block on the Threads_lock while
4928 // holding the Parker:: mutex. If safepoints are pending both the
4929 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4930 ThreadBlockInVM tbivm(jt);
4931
4932 // Don't wait if cannot get lock since interference arises from
4933 // unblocking. Also. check interrupt before trying wait
4934 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4935 return;
4936 }
4937
4938 int status;
4939 if (_counter > 0) { // no wait needed
4940 _counter = 0;
4941 status = pthread_mutex_unlock(_mutex);
4942 assert (status == 0, "invariant");
4943 OrderAccess::fence();
4944 return;
4945 }
4946
4947 #ifdef ASSERT
4948 // Don't catch signals while blocked; let the running threads have the signals.
4949 // (This allows a debugger to break into the running thread.)
4950 sigset_t oldsigs;
4951 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4952 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4953 #endif
4954
4955 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4956 jt->set_suspend_equivalent();
4957 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4958
4959 if (time == 0) {
4960 status = pthread_cond_wait (_cond, _mutex);
4961 } else {
4962 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4963 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4964 pthread_cond_destroy (_cond);
4965 pthread_cond_init (_cond, NULL);
4966 }
4967 }
4968 assert_status(status == 0 || status == EINTR ||
4969 status == ETIME || status == ETIMEDOUT,
4970 status, "cond_timedwait");
4971
4972 #ifdef ASSERT
4973 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4974 #endif
4975
4976 _counter = 0;
4977 status = pthread_mutex_unlock(_mutex);
4978 assert_status(status == 0, status, "invariant");
4979 // If externally suspended while waiting, re-suspend
4980 if (jt->handle_special_suspend_equivalent_condition()) {
4981 jt->java_suspend_self();
4982 }
4983
4984 OrderAccess::fence();
4985 }
4986
4987 void Parker::unpark() {
4988 int s, status;
4989 status = pthread_mutex_lock(_mutex);
4990 assert (status == 0, "invariant");
4991 s = _counter;
4992 _counter = 1;
4993 if (s < 1) {
4994 if (WorkAroundNPTLTimedWaitHang) {
4995 status = pthread_cond_signal (_cond);
4996 assert (status == 0, "invariant");
4997 status = pthread_mutex_unlock(_mutex);
4998 assert (status == 0, "invariant");
4999 } else {
5000 status = pthread_mutex_unlock(_mutex);
5001 assert (status == 0, "invariant");
5002 status = pthread_cond_signal (_cond);
5003 assert (status == 0, "invariant");
5004 }
5005 } else {
5006 pthread_mutex_unlock(_mutex);
5007 assert (status == 0, "invariant");
5008 }
5009 }
5010
5011
5012 extern char** environ;
5013
5014 // Run the specified command in a separate process. Return its exit value,
5015 // or -1 on failure (e.g. can't fork a new process).
5016 // Unlike system(), this function can be called from signal handler. It
5017 // doesn't block SIGINT et al.
5018 int os::fork_and_exec(char* cmd) {
5019 char * argv[4] = {"sh", "-c", cmd, NULL};
5020
5021 pid_t pid = fork();
5022
5023 if (pid < 0) {
5024 // fork failed
5025 return -1;
5026
5027 } else if (pid == 0) {
5028 // child process
5029
5030 // try to be consistent with system(), which uses "/usr/bin/sh" on AIX
5031 execve("/usr/bin/sh", argv, environ);
5032
5033 // execve failed
5034 _exit(-1);
5035
5036 } else {
5037 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5038 // care about the actual exit code, for now.
5039
5040 int status;
5041
5042 // Wait for the child process to exit. This returns immediately if
5043 // the child has already exited. */
5044 while (waitpid(pid, &status, 0) < 0) {
5045 switch (errno) {
5046 case ECHILD: return 0;
5047 case EINTR: break;
5048 default: return -1;
5049 }
5050 }
5051
5052 if (WIFEXITED(status)) {
5053 // The child exited normally; get its exit code.
5054 return WEXITSTATUS(status);
5055 } else if (WIFSIGNALED(status)) {
5056 // The child exited because of a signal
5057 // The best value to return is 0x80 + signal number,
5058 // because that is what all Unix shells do, and because
5059 // it allows callers to distinguish between process exit and
5060 // process death by signal.
5061 return 0x80 + WTERMSIG(status);
5062 } else {
5063 // Unknown exit code; pass it through
5064 return status;
5065 }
5066 }
5067 // Remove warning.
5068 return -1;
5069 }
5070
5071 // is_headless_jre()
5072 //
5073 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5074 // in order to report if we are running in a headless jre.
5075 //
5076 // Since JDK8 xawt/libmawt.so is moved into the same directory
5077 // as libawt.so, and renamed libawt_xawt.so
5078 bool os::is_headless_jre() {
5079 struct stat statbuf;
5080 char buf[MAXPATHLEN];
5081 char libmawtpath[MAXPATHLEN];
5082 const char *xawtstr = "/xawt/libmawt.so";
5083 const char *new_xawtstr = "/libawt_xawt.so";
5084
5085 char *p;
5086
5087 // Get path to libjvm.so
5088 os::jvm_path(buf, sizeof(buf));
5089
5090 // Get rid of libjvm.so
5091 p = strrchr(buf, '/');
5092 if (p == NULL) return false;
5093 else *p = '\0';
5094
5095 // Get rid of client or server
5096 p = strrchr(buf, '/');
5097 if (p == NULL) return false;
5098 else *p = '\0';
5099
5100 // check xawt/libmawt.so
5101 strcpy(libmawtpath, buf);
5102 strcat(libmawtpath, xawtstr);
5103 if (::stat(libmawtpath, &statbuf) == 0) return false;
5104
5105 // check libawt_xawt.so
5106 strcpy(libmawtpath, buf);
5107 strcat(libmawtpath, new_xawtstr);
5108 if (::stat(libmawtpath, &statbuf) == 0) return false;
5109
5110 return true;
5111 }
5112
5113 // Get the default path to the core file
5114 // Returns the length of the string
5115 int os::get_core_path(char* buffer, size_t bufferSize) {
5116 const char* p = get_current_directory(buffer, bufferSize);
5117
5118 if (p == NULL) {
5119 assert(p != NULL, "failed to get current directory");
5120 return 0;
5121 }
5122
5123 return strlen(buffer);
5124 }
5125
5126 #ifndef PRODUCT
5127 void TestReserveMemorySpecial_test() {
5128 // No tests available for this platform
5129 }
5130 #endif