1 /*
2 * Copyright (c) 1999, 2013, 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/thread.inline.hpp"
64 #include "runtime/threadCritical.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
74 // put OS-includes here (sorted alphabetically)
75 #include <errno.h>
76 #include <fcntl.h>
77 #include <inttypes.h>
78 #include <poll.h>
79 #include <procinfo.h>
80 #include <pthread.h>
81 #include <pwd.h>
82 #include <semaphore.h>
83 #include <signal.h>
84 #include <stdint.h>
85 #include <stdio.h>
86 #include <string.h>
87 #include <unistd.h>
88 #include <sys/ioctl.h>
89 #include <sys/ipc.h>
90 #include <sys/mman.h>
91 #include <sys/resource.h>
92 #include <sys/select.h>
93 #include <sys/shm.h>
94 #include <sys/socket.h>
95 #include <sys/stat.h>
96 #include <sys/sysinfo.h>
97 #include <sys/systemcfg.h>
98 #include <sys/time.h>
99 #include <sys/times.h>
100 #include <sys/types.h>
101 #include <sys/utsname.h>
102 #include <sys/vminfo.h>
103 #include <sys/wait.h>
104
105 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
106 #if !defined(_AIXVERSION_610)
107 extern "C" {
108 int getthrds64(pid_t ProcessIdentifier,
109 struct thrdentry64* ThreadBuffer,
110 int ThreadSize,
111 tid64_t* IndexPointer,
112 int Count);
113 }
114 #endif
115
116 // Excerpts from systemcfg.h definitions newer than AIX 5.3
117 #ifndef PV_7
118 # define PV_7 0x200000 // Power PC 7
119 # define PV_7_Compat 0x208000 // Power PC 7
120 #endif
121
122 #define MAX_PATH (2 * K)
123
124 // for timer info max values which include all bits
125 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
126 // for multipage initialization error analysis (in 'g_multipage_error')
127 #define ERROR_MP_OS_TOO_OLD 100
128 #define ERROR_MP_EXTSHM_ACTIVE 101
129 #define ERROR_MP_VMGETINFO_FAILED 102
130 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
131
132 // the semantics in this file are thus that codeptr_t is a *real code ptr*
133 // This means that any function taking codeptr_t as arguments will assume
134 // a real codeptr and won't handle function descriptors (eg getFuncName),
135 // whereas functions taking address as args will deal with function
136 // descriptors (eg os::dll_address_to_library_name)
137 typedef unsigned int* codeptr_t;
138
139 // typedefs for stackslots, stack pointers, pointers to op codes
140 typedef unsigned long stackslot_t;
141 typedef stackslot_t* stackptr_t;
142
143 // query dimensions of the stack of the calling thread
144 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
145
146 // function to check a given stack pointer against given stack limits
147 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
148 if (((uintptr_t)sp) & 0x7) {
149 return false;
150 }
151 if (sp > stack_base) {
152 return false;
153 }
154 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
155 return false;
156 }
157 return true;
158 }
159
160 // returns true if function is a valid codepointer
161 inline bool is_valid_codepointer(codeptr_t p) {
162 if (!p) {
163 return false;
164 }
165 if (((uintptr_t)p) & 0x3) {
166 return false;
167 }
168 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
169 return false;
170 }
171 return true;
172 }
173
174 // macro to check a given stack pointer against given stack limits and to die if test fails
175 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
176 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
177 }
178
179 // macro to check the current stack pointer against given stacklimits
180 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
181 address sp; \
182 sp = os::current_stack_pointer(); \
183 CHECK_STACK_PTR(sp, stack_base, stack_size); \
184 }
185
186 ////////////////////////////////////////////////////////////////////////////////
187 // global variables (for a description see os_aix.hpp)
188
189 julong os::Aix::_physical_memory = 0;
190 pthread_t os::Aix::_main_thread = ((pthread_t)0);
191 int os::Aix::_page_size = -1;
192 int os::Aix::_on_pase = -1;
193 int os::Aix::_os_version = -1;
194 int os::Aix::_stack_page_size = -1;
195 size_t os::Aix::_shm_default_page_size = -1;
196 int os::Aix::_can_use_64K_pages = -1;
197 int os::Aix::_can_use_16M_pages = -1;
198 int os::Aix::_xpg_sus_mode = -1;
199 int os::Aix::_extshm = -1;
200 int os::Aix::_logical_cpus = -1;
201
202 ////////////////////////////////////////////////////////////////////////////////
203 // local variables
204
205 static int g_multipage_error = -1; // error analysis for multipage initialization
206 static jlong initial_time_count = 0;
207 static int clock_tics_per_sec = 100;
208 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
209 static bool check_signals = true;
210 static pid_t _initial_pid = 0;
211 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
212 static sigset_t SR_sigset;
213 static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls */
214
215 julong os::available_memory() {
216 return Aix::available_memory();
217 }
218
219 julong os::Aix::available_memory() {
220 os::Aix::meminfo_t mi;
221 if (os::Aix::get_meminfo(&mi)) {
222 return mi.real_free;
223 } else {
224 return 0xFFFFFFFFFFFFFFFFLL;
225 }
226 }
227
228 julong os::physical_memory() {
229 return Aix::physical_memory();
230 }
231
232 ////////////////////////////////////////////////////////////////////////////////
233 // environment support
234
235 bool os::getenv(const char* name, char* buf, int len) {
236 const char* val = ::getenv(name);
237 if (val != NULL && strlen(val) < (size_t)len) {
238 strcpy(buf, val);
239 return true;
240 }
241 if (len > 0) buf[0] = 0; // return a null string
242 return false;
243 }
244
245
246 // Return true if user is running as root.
247
248 bool os::have_special_privileges() {
249 static bool init = false;
250 static bool privileges = false;
251 if (!init) {
252 privileges = (getuid() != geteuid()) || (getgid() != getegid());
253 init = true;
254 }
255 return privileges;
256 }
257
258 // Helper function, emulates disclaim64 using multiple 32bit disclaims
259 // because we cannot use disclaim64() on AS/400 and old AIX releases.
260 static bool my_disclaim64(char* addr, size_t size) {
261
262 if (size == 0) {
263 return true;
264 }
265
266 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
267 const unsigned int maxDisclaimSize = 0x80000000;
268
269 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
270 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
271
272 char* p = addr;
273
274 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
275 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
276 //if (Verbose)
277 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
278 return false;
279 }
280 p += maxDisclaimSize;
281 }
282
283 if (lastDisclaimSize > 0) {
284 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
285 //if (Verbose)
286 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
287 return false;
288 }
289 }
290
291 return true;
292 }
293
294 // Cpu architecture string
295 #if defined(PPC32)
296 static char cpu_arch[] = "ppc";
297 #elif defined(PPC64)
298 static char cpu_arch[] = "ppc64";
299 #else
300 #error Add appropriate cpu_arch setting
301 #endif
302
303
304 // Given an address, returns the size of the page backing that address.
305 size_t os::Aix::query_pagesize(void* addr) {
306
307 vm_page_info pi;
308 pi.addr = (uint64_t)addr;
309 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
310 return pi.pagesize;
311 } else {
312 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
313 assert(false, "vmgetinfo failed to retrieve page size");
314 return SIZE_4K;
315 }
316
317 }
318
319 // Returns the kernel thread id of the currently running thread.
320 pid_t os::Aix::gettid() {
321 return (pid_t) thread_self();
322 }
323
324 void os::Aix::initialize_system_info() {
325
326 // get the number of online(logical) cpus instead of configured
327 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
328 assert(_processor_count > 0, "_processor_count must be > 0");
329
330 // retrieve total physical storage
331 os::Aix::meminfo_t mi;
332 if (!os::Aix::get_meminfo(&mi)) {
333 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
334 assert(false, "os::Aix::get_meminfo failed.");
335 }
336 _physical_memory = (julong) mi.real_total;
337 }
338
339 // Helper function for tracing page sizes.
340 static const char* describe_pagesize(size_t pagesize) {
341 switch (pagesize) {
342 case SIZE_4K : return "4K";
343 case SIZE_64K: return "64K";
344 case SIZE_16M: return "16M";
345 case SIZE_16G: return "16G";
346 default:
347 assert(false, "surprise");
348 return "??";
349 }
350 }
351
352 // Retrieve information about multipage size support. Will initialize
353 // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages,
354 // Aix::_can_use_16M_pages.
355 // Must be called before calling os::large_page_init().
356 void os::Aix::query_multipage_support() {
357
358 guarantee(_page_size == -1 &&
359 _stack_page_size == -1 &&
360 _can_use_64K_pages == -1 &&
361 _can_use_16M_pages == -1 &&
362 g_multipage_error == -1,
363 "do not call twice");
364
365 _page_size = ::sysconf(_SC_PAGESIZE);
366
367 // This really would surprise me.
368 assert(_page_size == SIZE_4K, "surprise!");
369
370
371 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
372 // Default data page size is influenced either by linker options (-bdatapsize)
373 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
374 // default should be 4K.
375 size_t data_page_size = SIZE_4K;
376 {
377 void* p = ::malloc(SIZE_16M);
378 guarantee(p != NULL, "malloc failed");
379 data_page_size = os::Aix::query_pagesize(p);
380 ::free(p);
381 }
382
383 // query default shm page size (LDR_CNTRL SHMPSIZE)
384 {
385 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
386 guarantee(shmid != -1, "shmget failed");
387 void* p = ::shmat(shmid, NULL, 0);
388 ::shmctl(shmid, IPC_RMID, NULL);
389 guarantee(p != (void*) -1, "shmat failed");
390 _shm_default_page_size = os::Aix::query_pagesize(p);
391 ::shmdt(p);
392 }
393
394 // before querying the stack page size, make sure we are not running as primordial
395 // thread (because primordial thread's stack may have different page size than
396 // pthread thread stacks). Running a VM on the primordial thread won't work for a
397 // number of reasons so we may just as well guarantee it here
398 guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread");
399
400 // query stack page size
401 {
402 int dummy = 0;
403 _stack_page_size = os::Aix::query_pagesize(&dummy);
404 // everything else would surprise me and should be looked into
405 guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size");
406 // also, just for completeness: pthread stacks are allocated from C heap, so
407 // stack page size should be the same as data page size
408 guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size");
409 }
410
411 // EXTSHM is bad: among other things, it prevents setting pagesize dynamically
412 // for system V shm.
413 if (Aix::extshm()) {
414 if (Verbose) {
415 fprintf(stderr, "EXTSHM is active - will disable large page support.\n"
416 "Please make sure EXTSHM is OFF for large page support.\n");
417 }
418 g_multipage_error = ERROR_MP_EXTSHM_ACTIVE;
419 _can_use_64K_pages = _can_use_16M_pages = 0;
420 goto query_multipage_support_end;
421 }
422
423 // now check which page sizes the OS claims it supports, and of those, which actually can be used.
424 {
425 const int MAX_PAGE_SIZES = 4;
426 psize_t sizes[MAX_PAGE_SIZES];
427 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
428 if (num_psizes == -1) {
429 if (Verbose) {
430 fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
431 fprintf(stderr, "disabling multipage support.\n");
432 }
433 g_multipage_error = ERROR_MP_VMGETINFO_FAILED;
434 _can_use_64K_pages = _can_use_16M_pages = 0;
435 goto query_multipage_support_end;
436 }
437 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
438 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
439 if (Verbose) {
440 fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
441 for (int i = 0; i < num_psizes; i ++) {
442 fprintf(stderr, " %s ", describe_pagesize(sizes[i]));
443 }
444 fprintf(stderr, " .\n");
445 }
446
447 // Can we use 64K, 16M pages?
448 _can_use_64K_pages = 0;
449 _can_use_16M_pages = 0;
450 for (int i = 0; i < num_psizes; i ++) {
451 if (sizes[i] == SIZE_64K) {
452 _can_use_64K_pages = 1;
453 } else if (sizes[i] == SIZE_16M) {
454 _can_use_16M_pages = 1;
455 }
456 }
457
458 if (!_can_use_64K_pages) {
459 g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K;
460 }
461
462 // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages,
463 // there must be an actual 16M page pool, and we must run with enough rights.
464 if (_can_use_16M_pages) {
465 const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR);
466 guarantee(shmid != -1, "shmget failed");
467 struct shmid_ds shm_buf = { 0 };
468 shm_buf.shm_pagesize = SIZE_16M;
469 const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false;
470 const int en = errno;
471 ::shmctl(shmid, IPC_RMID, NULL);
472 if (!can_set_pagesize) {
473 if (Verbose) {
474 fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n"
475 "Will deactivate 16M support.\n", en, strerror(en));
476 }
477 _can_use_16M_pages = 0;
478 }
479 }
480
481 } // end: check which pages can be used for shared memory
482
483 query_multipage_support_end:
484
485 guarantee(_page_size != -1 &&
486 _stack_page_size != -1 &&
487 _can_use_64K_pages != -1 &&
488 _can_use_16M_pages != -1, "Page sizes not properly initialized");
489
490 if (_can_use_64K_pages) {
491 g_multipage_error = 0;
492 }
493
494 if (Verbose) {
495 fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size));
496 fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size));
497 fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size));
498 fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no"));
499 fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no"));
500 fprintf(stderr, "Multipage error details: %d\n", g_multipage_error);
501 }
502
503 } // end os::Aix::query_multipage_support()
504
505 // The code for this method was initially derived from the version in os_linux.cpp.
506 void os::init_system_properties_values() {
507
508 #define DEFAULT_LIBPATH "/usr/lib:/lib"
509 #define EXTENSIONS_DIR "/lib/ext"
510 #define ENDORSED_DIR "/lib/endorsed"
511
512 // Buffer that fits several sprintfs.
513 // Note that the space for the trailing null is provided
514 // by the nulls included by the sizeof operator.
515 const size_t bufsize =
516 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends.
517 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR), // extensions dir
518 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir
519 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
520
521 // sysclasspath, java_home, dll_dir
522 {
523 char *pslash;
524 os::jvm_path(buf, bufsize);
525
526 // Found the full path to libjvm.so.
527 // Now cut the path to <java_home>/jre if we can.
528 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
529 pslash = strrchr(buf, '/');
530 if (pslash != NULL) {
531 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
532 }
533 Arguments::set_dll_dir(buf);
534
535 if (pslash != NULL) {
536 pslash = strrchr(buf, '/');
537 if (pslash != NULL) {
538 *pslash = '\0'; // Get rid of /<arch>.
539 pslash = strrchr(buf, '/');
540 if (pslash != NULL) {
541 *pslash = '\0'; // Get rid of /lib.
542 }
543 }
544 }
545 Arguments::set_java_home(buf);
546 set_boot_path('/', ':');
547 }
548
549 // Where to look for native libraries.
550
551 // On Aix we get the user setting of LIBPATH.
552 // Eventually, all the library path setting will be done here.
553 // Get the user setting of LIBPATH.
554 char *v = ::getenv("LIBPATH");
555 const char *v_colon = ":";
556 if (v == NULL) { v = ""; v_colon = ""; }
557
558 // Concatenate user and invariant part of ld_library_path.
559 // That's +1 for the colon and +1 for the trailing '\0'.
560 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
561 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
562 Arguments::set_library_path(ld_library_path);
563 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal);
564
565 // Extensions directories.
566 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
567 Arguments::set_ext_dirs(buf);
568
569 // Endorsed standards default directory.
570 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
571 Arguments::set_endorsed_dirs(buf);
572
573 FREE_C_HEAP_ARRAY(char, buf, mtInternal);
574
575 #undef DEFAULT_LIBPATH
576 #undef EXTENSIONS_DIR
577 #undef ENDORSED_DIR
578 }
579
580 ////////////////////////////////////////////////////////////////////////////////
581 // breakpoint support
582
583 void os::breakpoint() {
584 BREAKPOINT;
585 }
586
587 extern "C" void breakpoint() {
588 // use debugger to set breakpoint here
589 }
590
591 ////////////////////////////////////////////////////////////////////////////////
592 // signal support
593
594 debug_only(static bool signal_sets_initialized = false);
595 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
596
597 bool os::Aix::is_sig_ignored(int sig) {
598 struct sigaction oact;
599 sigaction(sig, (struct sigaction*)NULL, &oact);
600 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
601 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
602 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
603 return true;
604 else
605 return false;
606 }
607
608 void os::Aix::signal_sets_init() {
609 // Should also have an assertion stating we are still single-threaded.
610 assert(!signal_sets_initialized, "Already initialized");
611 // Fill in signals that are necessarily unblocked for all threads in
612 // the VM. Currently, we unblock the following signals:
613 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
614 // by -Xrs (=ReduceSignalUsage));
615 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
616 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
617 // the dispositions or masks wrt these signals.
618 // Programs embedding the VM that want to use the above signals for their
619 // own purposes must, at this time, use the "-Xrs" option to prevent
620 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
621 // (See bug 4345157, and other related bugs).
622 // In reality, though, unblocking these signals is really a nop, since
623 // these signals are not blocked by default.
624 sigemptyset(&unblocked_sigs);
625 sigemptyset(&allowdebug_blocked_sigs);
626 sigaddset(&unblocked_sigs, SIGILL);
627 sigaddset(&unblocked_sigs, SIGSEGV);
628 sigaddset(&unblocked_sigs, SIGBUS);
629 sigaddset(&unblocked_sigs, SIGFPE);
630 sigaddset(&unblocked_sigs, SIGTRAP);
631 sigaddset(&unblocked_sigs, SIGDANGER);
632 sigaddset(&unblocked_sigs, SR_signum);
633
634 if (!ReduceSignalUsage) {
635 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
636 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
637 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
638 }
639 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
640 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
641 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
642 }
643 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
644 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
645 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
646 }
647 }
648 // Fill in signals that are blocked by all but the VM thread.
649 sigemptyset(&vm_sigs);
650 if (!ReduceSignalUsage)
651 sigaddset(&vm_sigs, BREAK_SIGNAL);
652 debug_only(signal_sets_initialized = true);
653 }
654
655 // These are signals that are unblocked while a thread is running Java.
656 // (For some reason, they get blocked by default.)
657 sigset_t* os::Aix::unblocked_signals() {
658 assert(signal_sets_initialized, "Not initialized");
659 return &unblocked_sigs;
660 }
661
662 // These are the signals that are blocked while a (non-VM) thread is
663 // running Java. Only the VM thread handles these signals.
664 sigset_t* os::Aix::vm_signals() {
665 assert(signal_sets_initialized, "Not initialized");
666 return &vm_sigs;
667 }
668
669 // These are signals that are blocked during cond_wait to allow debugger in
670 sigset_t* os::Aix::allowdebug_blocked_signals() {
671 assert(signal_sets_initialized, "Not initialized");
672 return &allowdebug_blocked_sigs;
673 }
674
675 void os::Aix::hotspot_sigmask(Thread* thread) {
676
677 //Save caller's signal mask before setting VM signal mask
678 sigset_t caller_sigmask;
679 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
680
681 OSThread* osthread = thread->osthread();
682 osthread->set_caller_sigmask(caller_sigmask);
683
684 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
685
686 if (!ReduceSignalUsage) {
687 if (thread->is_VM_thread()) {
688 // Only the VM thread handles BREAK_SIGNAL ...
689 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
690 } else {
691 // ... all other threads block BREAK_SIGNAL
692 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
693 }
694 }
695 }
696
697 // retrieve memory information.
698 // Returns false if something went wrong;
699 // content of pmi undefined in this case.
700 bool os::Aix::get_meminfo(meminfo_t* pmi) {
701
702 assert(pmi, "get_meminfo: invalid parameter");
703
704 memset(pmi, 0, sizeof(meminfo_t));
705
706 if (os::Aix::on_pase()) {
707
708 Unimplemented();
709 return false;
710
711 } else {
712
713 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
714 // See:
715 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
716 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
717 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
718 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
719
720 perfstat_memory_total_t psmt;
721 memset (&psmt, '\0', sizeof(psmt));
722 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
723 if (rc == -1) {
724 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
725 assert(0, "perfstat_memory_total() failed");
726 return false;
727 }
728
729 assert(rc == 1, "perfstat_memory_total() - weird return code");
730
731 // excerpt from
732 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
733 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
734 // The fields of perfstat_memory_total_t:
735 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
736 // u_longlong_t real_total Total real memory (in 4 KB pages).
737 // u_longlong_t real_free Free real memory (in 4 KB pages).
738 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
739 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
740
741 pmi->virt_total = psmt.virt_total * 4096;
742 pmi->real_total = psmt.real_total * 4096;
743 pmi->real_free = psmt.real_free * 4096;
744 pmi->pgsp_total = psmt.pgsp_total * 4096;
745 pmi->pgsp_free = psmt.pgsp_free * 4096;
746
747 return true;
748
749 }
750 } // end os::Aix::get_meminfo
751
752 // Retrieve global cpu information.
753 // Returns false if something went wrong;
754 // the content of pci is undefined in this case.
755 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
756 assert(pci, "get_cpuinfo: invalid parameter");
757 memset(pci, 0, sizeof(cpuinfo_t));
758
759 perfstat_cpu_total_t psct;
760 memset (&psct, '\0', sizeof(psct));
761
762 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
763 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
764 assert(0, "perfstat_cpu_total() failed");
765 return false;
766 }
767
768 // global cpu information
769 strcpy (pci->description, psct.description);
770 pci->processorHZ = psct.processorHZ;
771 pci->ncpus = psct.ncpus;
772 os::Aix::_logical_cpus = psct.ncpus;
773 for (int i = 0; i < 3; i++) {
774 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
775 }
776
777 // get the processor version from _system_configuration
778 switch (_system_configuration.version) {
779 case PV_7:
780 strcpy(pci->version, "Power PC 7");
781 break;
782 case PV_6_1:
783 strcpy(pci->version, "Power PC 6 DD1.x");
784 break;
785 case PV_6:
786 strcpy(pci->version, "Power PC 6");
787 break;
788 case PV_5:
789 strcpy(pci->version, "Power PC 5");
790 break;
791 case PV_5_2:
792 strcpy(pci->version, "Power PC 5_2");
793 break;
794 case PV_5_3:
795 strcpy(pci->version, "Power PC 5_3");
796 break;
797 case PV_5_Compat:
798 strcpy(pci->version, "PV_5_Compat");
799 break;
800 case PV_6_Compat:
801 strcpy(pci->version, "PV_6_Compat");
802 break;
803 case PV_7_Compat:
804 strcpy(pci->version, "PV_7_Compat");
805 break;
806 default:
807 strcpy(pci->version, "unknown");
808 }
809
810 return true;
811
812 } //end os::Aix::get_cpuinfo
813
814 //////////////////////////////////////////////////////////////////////////////
815 // detecting pthread library
816
817 void os::Aix::libpthread_init() {
818 return;
819 }
820
821 //////////////////////////////////////////////////////////////////////////////
822 // create new thread
823
824 // Thread start routine for all newly created threads
825 static void *java_start(Thread *thread) {
826
827 // find out my own stack dimensions
828 {
829 // actually, this should do exactly the same as thread->record_stack_base_and_size...
830 address base = 0;
831 size_t size = 0;
832 query_stack_dimensions(&base, &size);
833 thread->set_stack_base(base);
834 thread->set_stack_size(size);
835 }
836
837 // Do some sanity checks.
838 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
839
840 // Try to randomize the cache line index of hot stack frames.
841 // This helps when threads of the same stack traces evict each other's
842 // cache lines. The threads can be either from the same JVM instance, or
843 // from different JVM instances. The benefit is especially true for
844 // processors with hyperthreading technology.
845
846 static int counter = 0;
847 int pid = os::current_process_id();
848 alloca(((pid ^ counter++) & 7) * 128);
849
850 ThreadLocalStorage::set_thread(thread);
851
852 OSThread* osthread = thread->osthread();
853
854 // thread_id is kernel thread id (similar to Solaris LWP id)
855 osthread->set_thread_id(os::Aix::gettid());
856
857 // initialize signal mask for this thread
858 os::Aix::hotspot_sigmask(thread);
859
860 // initialize floating point control register
861 os::Aix::init_thread_fpu_state();
862
863 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
864
865 // call one more level start routine
866 thread->run();
867
868 return 0;
869 }
870
871 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
872
873 // We want the whole function to be synchronized.
874 ThreadCritical cs;
875
876 assert(thread->osthread() == NULL, "caller responsible");
877
878 // Allocate the OSThread object
879 OSThread* osthread = new OSThread(NULL, NULL);
880 if (osthread == NULL) {
881 return false;
882 }
883
884 // set the correct thread state
885 osthread->set_thread_type(thr_type);
886
887 // Initial state is ALLOCATED but not INITIALIZED
888 osthread->set_state(ALLOCATED);
889
890 thread->set_osthread(osthread);
891
892 // init thread attributes
893 pthread_attr_t attr;
894 pthread_attr_init(&attr);
895 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
896
897 // Make sure we run in 1:1 kernel-user-thread mode.
898 if (os::Aix::on_aix()) {
899 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
900 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
901 } // end: aix
902
903 // Start in suspended state, and in os::thread_start, wake the thread up.
904 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
905
906 // calculate stack size if it's not specified by caller
907 if (os::Aix::supports_variable_stack_size()) {
908 if (stack_size == 0) {
909 stack_size = os::Aix::default_stack_size(thr_type);
910
911 switch (thr_type) {
912 case os::java_thread:
913 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
914 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
915 stack_size = JavaThread::stack_size_at_create();
916 break;
917 case os::compiler_thread:
918 if (CompilerThreadStackSize > 0) {
919 stack_size = (size_t)(CompilerThreadStackSize * K);
920 break;
921 } // else fall through:
922 // use VMThreadStackSize if CompilerThreadStackSize is not defined
923 case os::vm_thread:
924 case os::pgc_thread:
925 case os::cgc_thread:
926 case os::watcher_thread:
927 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
928 break;
929 }
930 }
931
932 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
933 pthread_attr_setstacksize(&attr, stack_size);
934 } //else let thread_create() pick the default value (96 K on AIX)
935
936 pthread_t tid;
937 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
938
939 pthread_attr_destroy(&attr);
940
941 if (ret != 0) {
942 if (PrintMiscellaneous && (Verbose || WizardMode)) {
943 perror("pthread_create()");
944 }
945 // Need to clean up stuff we've allocated so far
946 thread->set_osthread(NULL);
947 delete osthread;
948 return false;
949 }
950
951 // Store pthread info into the OSThread
952 osthread->set_pthread_id(tid);
953
954 return true;
955 }
956
957 /////////////////////////////////////////////////////////////////////////////
958 // attach existing thread
959
960 // bootstrap the main thread
961 bool os::create_main_thread(JavaThread* thread) {
962 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
963 return create_attached_thread(thread);
964 }
965
966 bool os::create_attached_thread(JavaThread* thread) {
967 #ifdef ASSERT
968 thread->verify_not_published();
969 #endif
970
971 // Allocate the OSThread object
972 OSThread* osthread = new OSThread(NULL, NULL);
973
974 if (osthread == NULL) {
975 return false;
976 }
977
978 // Store pthread info into the OSThread
979 osthread->set_thread_id(os::Aix::gettid());
980 osthread->set_pthread_id(::pthread_self());
981
982 // initialize floating point control register
983 os::Aix::init_thread_fpu_state();
984
985 // some sanity checks
986 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
987
988 // Initial thread state is RUNNABLE
989 osthread->set_state(RUNNABLE);
990
991 thread->set_osthread(osthread);
992
993 if (UseNUMA) {
994 int lgrp_id = os::numa_get_group_id();
995 if (lgrp_id != -1) {
996 thread->set_lgrp_id(lgrp_id);
997 }
998 }
999
1000 // initialize signal mask for this thread
1001 // and save the caller's signal mask
1002 os::Aix::hotspot_sigmask(thread);
1003
1004 return true;
1005 }
1006
1007 void os::pd_start_thread(Thread* thread) {
1008 int status = pthread_continue_np(thread->osthread()->pthread_id());
1009 assert(status == 0, "thr_continue failed");
1010 }
1011
1012 // Free OS resources related to the OSThread
1013 void os::free_thread(OSThread* osthread) {
1014 assert(osthread != NULL, "osthread not set");
1015
1016 if (Thread::current()->osthread() == osthread) {
1017 // Restore caller's signal mask
1018 sigset_t sigmask = osthread->caller_sigmask();
1019 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1020 }
1021
1022 delete osthread;
1023 }
1024
1025 //////////////////////////////////////////////////////////////////////////////
1026 // thread local storage
1027
1028 int os::allocate_thread_local_storage() {
1029 pthread_key_t key;
1030 int rslt = pthread_key_create(&key, NULL);
1031 assert(rslt == 0, "cannot allocate thread local storage");
1032 return (int)key;
1033 }
1034
1035 // Note: This is currently not used by VM, as we don't destroy TLS key
1036 // on VM exit.
1037 void os::free_thread_local_storage(int index) {
1038 int rslt = pthread_key_delete((pthread_key_t)index);
1039 assert(rslt == 0, "invalid index");
1040 }
1041
1042 void os::thread_local_storage_at_put(int index, void* value) {
1043 int rslt = pthread_setspecific((pthread_key_t)index, value);
1044 assert(rslt == 0, "pthread_setspecific failed");
1045 }
1046
1047 extern "C" Thread* get_thread() {
1048 return ThreadLocalStorage::thread();
1049 }
1050
1051 ////////////////////////////////////////////////////////////////////////////////
1052 // time support
1053
1054 // Time since start-up in seconds to a fine granularity.
1055 // Used by VMSelfDestructTimer and the MemProfiler.
1056 double os::elapsedTime() {
1057 return (double)(os::elapsed_counter()) * 0.000001;
1058 }
1059
1060 jlong os::elapsed_counter() {
1061 timeval time;
1062 int status = gettimeofday(&time, NULL);
1063 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1064 }
1065
1066 jlong os::elapsed_frequency() {
1067 return (1000 * 1000);
1068 }
1069
1070 // For now, we say that linux does not support vtime. I have no idea
1071 // whether it can actually be made to (DLD, 9/13/05).
1072
1073 bool os::supports_vtime() { return false; }
1074 bool os::enable_vtime() { return false; }
1075 bool os::vtime_enabled() { return false; }
1076 double os::elapsedVTime() {
1077 // better than nothing, but not much
1078 return elapsedTime();
1079 }
1080
1081 jlong os::javaTimeMillis() {
1082 timeval time;
1083 int status = gettimeofday(&time, NULL);
1084 assert(status != -1, "aix error at gettimeofday()");
1085 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1086 }
1087
1088 // We need to manually declare mread_real_time,
1089 // because IBM didn't provide a prototype in time.h.
1090 // (they probably only ever tested in C, not C++)
1091 extern "C"
1092 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1093
1094 jlong os::javaTimeNanos() {
1095 if (os::Aix::on_pase()) {
1096 Unimplemented();
1097 return 0;
1098 }
1099 else {
1100 // On AIX use the precision of processors real time clock
1101 // or time base registers.
1102 timebasestruct_t time;
1103 int rc;
1104
1105 // If the CPU has a time register, it will be used and
1106 // we have to convert to real time first. After convertion we have following data:
1107 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1108 // time.tb_low [nanoseconds after the last full second above]
1109 // We better use mread_real_time here instead of read_real_time
1110 // to ensure that we will get a monotonic increasing time.
1111 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1112 rc = time_base_to_time(&time, TIMEBASE_SZ);
1113 assert(rc != -1, "aix error at time_base_to_time()");
1114 }
1115 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1116 }
1117 }
1118
1119 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1120 info_ptr->max_value = ALL_64_BITS;
1121 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1122 info_ptr->may_skip_backward = false;
1123 info_ptr->may_skip_forward = false;
1124 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1125 }
1126
1127 // Return the real, user, and system times in seconds from an
1128 // arbitrary fixed point in the past.
1129 bool os::getTimesSecs(double* process_real_time,
1130 double* process_user_time,
1131 double* process_system_time) {
1132 struct tms ticks;
1133 clock_t real_ticks = times(&ticks);
1134
1135 if (real_ticks == (clock_t) (-1)) {
1136 return false;
1137 } else {
1138 double ticks_per_second = (double) clock_tics_per_sec;
1139 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1140 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1141 *process_real_time = ((double) real_ticks) / ticks_per_second;
1142
1143 return true;
1144 }
1145 }
1146
1147
1148 char * os::local_time_string(char *buf, size_t buflen) {
1149 struct tm t;
1150 time_t long_time;
1151 time(&long_time);
1152 localtime_r(&long_time, &t);
1153 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1154 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1155 t.tm_hour, t.tm_min, t.tm_sec);
1156 return buf;
1157 }
1158
1159 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1160 return localtime_r(clock, res);
1161 }
1162
1163 ////////////////////////////////////////////////////////////////////////////////
1164 // runtime exit support
1165
1166 // Note: os::shutdown() might be called very early during initialization, or
1167 // called from signal handler. Before adding something to os::shutdown(), make
1168 // sure it is async-safe and can handle partially initialized VM.
1169 void os::shutdown() {
1170
1171 // allow PerfMemory to attempt cleanup of any persistent resources
1172 perfMemory_exit();
1173
1174 // needs to remove object in file system
1175 AttachListener::abort();
1176
1177 // flush buffered output, finish log files
1178 ostream_abort();
1179
1180 // Check for abort hook
1181 abort_hook_t abort_hook = Arguments::abort_hook();
1182 if (abort_hook != NULL) {
1183 abort_hook();
1184 }
1185
1186 }
1187
1188 // Note: os::abort() might be called very early during initialization, or
1189 // called from signal handler. Before adding something to os::abort(), make
1190 // sure it is async-safe and can handle partially initialized VM.
1191 void os::abort(bool dump_core) {
1192 os::shutdown();
1193 if (dump_core) {
1194 #ifndef PRODUCT
1195 fdStream out(defaultStream::output_fd());
1196 out.print_raw("Current thread is ");
1197 char buf[16];
1198 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1199 out.print_raw_cr(buf);
1200 out.print_raw_cr("Dumping core ...");
1201 #endif
1202 ::abort(); // dump core
1203 }
1204
1205 ::exit(1);
1206 }
1207
1208 // Die immediately, no exit hook, no abort hook, no cleanup.
1209 void os::die() {
1210 ::abort();
1211 }
1212
1213 // Unused on Aix for now.
1214 void os::set_error_file(const char *logfile) {}
1215
1216
1217 // This method is a copy of JDK's sysGetLastErrorString
1218 // from src/solaris/hpi/src/system_md.c
1219
1220 size_t os::lasterror(char *buf, size_t len) {
1221
1222 if (errno == 0) return 0;
1223
1224 const char *s = ::strerror(errno);
1225 size_t n = ::strlen(s);
1226 if (n >= len) {
1227 n = len - 1;
1228 }
1229 ::strncpy(buf, s, n);
1230 buf[n] = '\0';
1231 return n;
1232 }
1233
1234 intx os::current_thread_id() { return (intx)pthread_self(); }
1235 int os::current_process_id() {
1236
1237 // This implementation returns a unique pid, the pid of the
1238 // launcher thread that starts the vm 'process'.
1239
1240 // Under POSIX, getpid() returns the same pid as the
1241 // launcher thread rather than a unique pid per thread.
1242 // Use gettid() if you want the old pre NPTL behaviour.
1243
1244 // if you are looking for the result of a call to getpid() that
1245 // returns a unique pid for the calling thread, then look at the
1246 // OSThread::thread_id() method in osThread_linux.hpp file
1247
1248 return (int)(_initial_pid ? _initial_pid : getpid());
1249 }
1250
1251 // DLL functions
1252
1253 const char* os::dll_file_extension() { return ".so"; }
1254
1255 // This must be hard coded because it's the system's temporary
1256 // directory not the java application's temp directory, ala java.io.tmpdir.
1257 const char* os::get_temp_directory() { return "/tmp"; }
1258
1259 static bool file_exists(const char* filename) {
1260 struct stat statbuf;
1261 if (filename == NULL || strlen(filename) == 0) {
1262 return false;
1263 }
1264 return os::stat(filename, &statbuf) == 0;
1265 }
1266
1267 bool os::dll_build_name(char* buffer, size_t buflen,
1268 const char* pname, const char* fname) {
1269 bool retval = false;
1270 // Copied from libhpi
1271 const size_t pnamelen = pname ? strlen(pname) : 0;
1272
1273 // Return error on buffer overflow.
1274 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1275 *buffer = '\0';
1276 return retval;
1277 }
1278
1279 if (pnamelen == 0) {
1280 snprintf(buffer, buflen, "lib%s.so", fname);
1281 retval = true;
1282 } else if (strchr(pname, *os::path_separator()) != NULL) {
1283 int n;
1284 char** pelements = split_path(pname, &n);
1285 for (int i = 0; i < n; i++) {
1286 // Really shouldn't be NULL, but check can't hurt
1287 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1288 continue; // skip the empty path values
1289 }
1290 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1291 if (file_exists(buffer)) {
1292 retval = true;
1293 break;
1294 }
1295 }
1296 // release the storage
1297 for (int i = 0; i < n; i++) {
1298 if (pelements[i] != NULL) {
1299 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
1300 }
1301 }
1302 if (pelements != NULL) {
1303 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
1304 }
1305 } else {
1306 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1307 retval = true;
1308 }
1309 return retval;
1310 }
1311
1312 // Check if addr is inside libjvm.so.
1313 bool os::address_is_in_vm(address addr) {
1314
1315 // Input could be a real pc or a function pointer literal. The latter
1316 // would be a function descriptor residing in the data segment of a module.
1317
1318 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1319 if (lib) {
1320 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1321 return true;
1322 } else {
1323 return false;
1324 }
1325 } else {
1326 lib = LoadedLibraries::find_for_data_address(addr);
1327 if (lib) {
1328 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1329 return true;
1330 } else {
1331 return false;
1332 }
1333 } else {
1334 return false;
1335 }
1336 }
1337 }
1338
1339 // Resolve an AIX function descriptor literal to a code pointer.
1340 // If the input is a valid code pointer to a text segment of a loaded module,
1341 // it is returned unchanged.
1342 // If the input is a valid AIX function descriptor, it is resolved to the
1343 // code entry point.
1344 // If the input is neither a valid function descriptor nor a valid code pointer,
1345 // NULL is returned.
1346 static address resolve_function_descriptor_to_code_pointer(address p) {
1347
1348 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1349 if (lib) {
1350 // its a real code pointer
1351 return p;
1352 } else {
1353 lib = LoadedLibraries::find_for_data_address(p);
1354 if (lib) {
1355 // pointer to data segment, potential function descriptor
1356 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1357 if (LoadedLibraries::find_for_text_address(code_entry)) {
1358 // Its a function descriptor
1359 return code_entry;
1360 }
1361 }
1362 }
1363 return NULL;
1364 }
1365
1366 bool os::dll_address_to_function_name(address addr, char *buf,
1367 int buflen, int *offset) {
1368 if (offset) {
1369 *offset = -1;
1370 }
1371 if (buf) {
1372 buf[0] = '\0';
1373 }
1374
1375 // Resolve function ptr literals first.
1376 addr = resolve_function_descriptor_to_code_pointer(addr);
1377 if (!addr) {
1378 return false;
1379 }
1380
1381 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1382 return Decoder::decode(addr, buf, buflen, offset);
1383 }
1384
1385 static int getModuleName(codeptr_t pc, // [in] program counter
1386 char* p_name, size_t namelen, // [out] optional: function name
1387 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1388 ) {
1389
1390 // initialize output parameters
1391 if (p_name && namelen > 0) {
1392 *p_name = '\0';
1393 }
1394 if (p_errmsg && errmsglen > 0) {
1395 *p_errmsg = '\0';
1396 }
1397
1398 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1399 if (lib) {
1400 if (p_name && namelen > 0) {
1401 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1402 }
1403 return 0;
1404 }
1405
1406 if (Verbose) {
1407 fprintf(stderr, "pc outside any module");
1408 }
1409
1410 return -1;
1411
1412 }
1413
1414 bool os::dll_address_to_library_name(address addr, char* buf,
1415 int buflen, int* offset) {
1416 if (offset) {
1417 *offset = -1;
1418 }
1419 if (buf) {
1420 buf[0] = '\0';
1421 }
1422
1423 // Resolve function ptr literals first.
1424 addr = resolve_function_descriptor_to_code_pointer(addr);
1425 if (!addr) {
1426 return false;
1427 }
1428
1429 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1430 return true;
1431 }
1432 return false;
1433 }
1434
1435 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1436 // for the same architecture as Hotspot is running on
1437 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1438
1439 if (ebuf && ebuflen > 0) {
1440 ebuf[0] = '\0';
1441 ebuf[ebuflen - 1] = '\0';
1442 }
1443
1444 if (!filename || strlen(filename) == 0) {
1445 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1446 return NULL;
1447 }
1448
1449 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1450 void * result= ::dlopen(filename, RTLD_LAZY);
1451 if (result != NULL) {
1452 // Reload dll cache. Don't do this in signal handling.
1453 LoadedLibraries::reload();
1454 return result;
1455 } else {
1456 // error analysis when dlopen fails
1457 const char* const error_report = ::dlerror();
1458 if (error_report && ebuf && ebuflen > 0) {
1459 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1460 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1461 }
1462 }
1463 return NULL;
1464 }
1465
1466 // Glibc-2.0 libdl is not MT safe. If you are building with any glibc,
1467 // chances are you might want to run the generated bits against glibc-2.0
1468 // libdl.so, so always use locking for any version of glibc.
1469 void* os::dll_lookup(void* handle, const char* name) {
1470 pthread_mutex_lock(&dl_mutex);
1471 void* res = dlsym(handle, name);
1472 pthread_mutex_unlock(&dl_mutex);
1473 return res;
1474 }
1475
1476 void* os::get_default_process_handle() {
1477 return (void*)::dlopen(NULL, RTLD_LAZY);
1478 }
1479
1480 void os::print_dll_info(outputStream *st) {
1481 st->print_cr("Dynamic libraries:");
1482 LoadedLibraries::print(st);
1483 }
1484
1485 void os::print_os_info(outputStream* st) {
1486 st->print("OS:");
1487
1488 st->print("uname:");
1489 struct utsname name;
1490 uname(&name);
1491 st->print(name.sysname); st->print(" ");
1492 st->print(name.nodename); st->print(" ");
1493 st->print(name.release); st->print(" ");
1494 st->print(name.version); st->print(" ");
1495 st->print(name.machine);
1496 st->cr();
1497
1498 // rlimit
1499 st->print("rlimit:");
1500 struct rlimit rlim;
1501
1502 st->print(" STACK ");
1503 getrlimit(RLIMIT_STACK, &rlim);
1504 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1505 else st->print("%uk", rlim.rlim_cur >> 10);
1506
1507 st->print(", CORE ");
1508 getrlimit(RLIMIT_CORE, &rlim);
1509 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1510 else st->print("%uk", rlim.rlim_cur >> 10);
1511
1512 st->print(", NPROC ");
1513 st->print("%d", sysconf(_SC_CHILD_MAX));
1514
1515 st->print(", NOFILE ");
1516 getrlimit(RLIMIT_NOFILE, &rlim);
1517 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1518 else st->print("%d", rlim.rlim_cur);
1519
1520 st->print(", AS ");
1521 getrlimit(RLIMIT_AS, &rlim);
1522 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1523 else st->print("%uk", rlim.rlim_cur >> 10);
1524
1525 // Print limits on DATA, because it limits the C-heap.
1526 st->print(", DATA ");
1527 getrlimit(RLIMIT_DATA, &rlim);
1528 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1529 else st->print("%uk", rlim.rlim_cur >> 10);
1530 st->cr();
1531
1532 // load average
1533 st->print("load average:");
1534 double loadavg[3] = {-1.L, -1.L, -1.L};
1535 os::loadavg(loadavg, 3);
1536 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1537 st->cr();
1538 }
1539
1540 void os::print_memory_info(outputStream* st) {
1541
1542 st->print_cr("Memory:");
1543
1544 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1545 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1546 st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size()));
1547 st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no"));
1548 st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no"));
1549 if (g_multipage_error != 0) {
1550 st->print_cr(" multipage error: %d", g_multipage_error);
1551 }
1552
1553 // print out LDR_CNTRL because it affects the default page sizes
1554 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1555 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1556
1557 const char* const extshm = ::getenv("EXTSHM");
1558 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1559
1560 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1561 os::Aix::meminfo_t mi;
1562 if (os::Aix::get_meminfo(&mi)) {
1563 char buffer[256];
1564 if (os::Aix::on_aix()) {
1565 jio_snprintf(buffer, sizeof(buffer),
1566 " physical total : %llu\n"
1567 " physical free : %llu\n"
1568 " swap total : %llu\n"
1569 " swap free : %llu\n",
1570 mi.real_total,
1571 mi.real_free,
1572 mi.pgsp_total,
1573 mi.pgsp_free);
1574 } else {
1575 Unimplemented();
1576 }
1577 st->print_raw(buffer);
1578 } else {
1579 st->print_cr(" (no more information available)");
1580 }
1581 }
1582
1583 void os::pd_print_cpu_info(outputStream* st) {
1584 // cpu
1585 st->print("CPU:");
1586 st->print("total %d", os::processor_count());
1587 // It's not safe to query number of active processors after crash
1588 // st->print("(active %d)", os::active_processor_count());
1589 st->print(" %s", VM_Version::cpu_features());
1590 st->cr();
1591 }
1592
1593 void os::print_siginfo(outputStream* st, void* siginfo) {
1594 // Use common posix version.
1595 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1596 st->cr();
1597 }
1598
1599
1600 static void print_signal_handler(outputStream* st, int sig,
1601 char* buf, size_t buflen);
1602
1603 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1604 st->print_cr("Signal Handlers:");
1605 print_signal_handler(st, SIGSEGV, buf, buflen);
1606 print_signal_handler(st, SIGBUS , buf, buflen);
1607 print_signal_handler(st, SIGFPE , buf, buflen);
1608 print_signal_handler(st, SIGPIPE, buf, buflen);
1609 print_signal_handler(st, SIGXFSZ, buf, buflen);
1610 print_signal_handler(st, SIGILL , buf, buflen);
1611 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1612 print_signal_handler(st, SR_signum, buf, buflen);
1613 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1614 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1615 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1616 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1617 print_signal_handler(st, SIGTRAP, buf, buflen);
1618 print_signal_handler(st, SIGDANGER, buf, buflen);
1619 }
1620
1621 static char saved_jvm_path[MAXPATHLEN] = {0};
1622
1623 // Find the full path to the current module, libjvm.so or libjvm_g.so
1624 void os::jvm_path(char *buf, jint buflen) {
1625 // Error checking.
1626 if (buflen < MAXPATHLEN) {
1627 assert(false, "must use a large-enough buffer");
1628 buf[0] = '\0';
1629 return;
1630 }
1631 // Lazy resolve the path to current module.
1632 if (saved_jvm_path[0] != 0) {
1633 strcpy(buf, saved_jvm_path);
1634 return;
1635 }
1636
1637 Dl_info dlinfo;
1638 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1639 assert(ret != 0, "cannot locate libjvm");
1640 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1641 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1642
1643 strcpy(saved_jvm_path, buf);
1644 }
1645
1646 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1647 // no prefix required, not even "_"
1648 }
1649
1650 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1651 // no suffix required
1652 }
1653
1654 ////////////////////////////////////////////////////////////////////////////////
1655 // sun.misc.Signal support
1656
1657 static volatile jint sigint_count = 0;
1658
1659 static void
1660 UserHandler(int sig, void *siginfo, void *context) {
1661 // 4511530 - sem_post is serialized and handled by the manager thread. When
1662 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1663 // don't want to flood the manager thread with sem_post requests.
1664 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1665 return;
1666
1667 // Ctrl-C is pressed during error reporting, likely because the error
1668 // handler fails to abort. Let VM die immediately.
1669 if (sig == SIGINT && is_error_reported()) {
1670 os::die();
1671 }
1672
1673 os::signal_notify(sig);
1674 }
1675
1676 void* os::user_handler() {
1677 return CAST_FROM_FN_PTR(void*, UserHandler);
1678 }
1679
1680 extern "C" {
1681 typedef void (*sa_handler_t)(int);
1682 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1683 }
1684
1685 void* os::signal(int signal_number, void* handler) {
1686 struct sigaction sigAct, oldSigAct;
1687
1688 sigfillset(&(sigAct.sa_mask));
1689
1690 // Do not block out synchronous signals in the signal handler.
1691 // Blocking synchronous signals only makes sense if you can really
1692 // be sure that those signals won't happen during signal handling,
1693 // when the blocking applies. Normal signal handlers are lean and
1694 // do not cause signals. But our signal handlers tend to be "risky"
1695 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1696 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1697 // by a SIGILL, which was blocked due to the signal mask. The process
1698 // just hung forever. Better to crash from a secondary signal than to hang.
1699 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1700 sigdelset(&(sigAct.sa_mask), SIGBUS);
1701 sigdelset(&(sigAct.sa_mask), SIGILL);
1702 sigdelset(&(sigAct.sa_mask), SIGFPE);
1703 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1704
1705 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1706
1707 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1708
1709 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1710 // -1 means registration failed
1711 return (void *)-1;
1712 }
1713
1714 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1715 }
1716
1717 void os::signal_raise(int signal_number) {
1718 ::raise(signal_number);
1719 }
1720
1721 //
1722 // The following code is moved from os.cpp for making this
1723 // code platform specific, which it is by its very nature.
1724 //
1725
1726 // Will be modified when max signal is changed to be dynamic
1727 int os::sigexitnum_pd() {
1728 return NSIG;
1729 }
1730
1731 // a counter for each possible signal value
1732 static volatile jint pending_signals[NSIG+1] = { 0 };
1733
1734 // Linux(POSIX) specific hand shaking semaphore.
1735 static sem_t sig_sem;
1736
1737 void os::signal_init_pd() {
1738 // Initialize signal structures
1739 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1740
1741 // Initialize signal semaphore
1742 int rc = ::sem_init(&sig_sem, 0, 0);
1743 guarantee(rc != -1, "sem_init failed");
1744 }
1745
1746 void os::signal_notify(int sig) {
1747 Atomic::inc(&pending_signals[sig]);
1748 ::sem_post(&sig_sem);
1749 }
1750
1751 static int check_pending_signals(bool wait) {
1752 Atomic::store(0, &sigint_count);
1753 for (;;) {
1754 for (int i = 0; i < NSIG + 1; i++) {
1755 jint n = pending_signals[i];
1756 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1757 return i;
1758 }
1759 }
1760 if (!wait) {
1761 return -1;
1762 }
1763 JavaThread *thread = JavaThread::current();
1764 ThreadBlockInVM tbivm(thread);
1765
1766 bool threadIsSuspended;
1767 do {
1768 thread->set_suspend_equivalent();
1769 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1770
1771 ::sem_wait(&sig_sem);
1772
1773 // were we externally suspended while we were waiting?
1774 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1775 if (threadIsSuspended) {
1776 //
1777 // The semaphore has been incremented, but while we were waiting
1778 // another thread suspended us. We don't want to continue running
1779 // while suspended because that would surprise the thread that
1780 // suspended us.
1781 //
1782 ::sem_post(&sig_sem);
1783
1784 thread->java_suspend_self();
1785 }
1786 } while (threadIsSuspended);
1787 }
1788 }
1789
1790 int os::signal_lookup() {
1791 return check_pending_signals(false);
1792 }
1793
1794 int os::signal_wait() {
1795 return check_pending_signals(true);
1796 }
1797
1798 ////////////////////////////////////////////////////////////////////////////////
1799 // Virtual Memory
1800
1801 // AddrRange describes an immutable address range
1802 //
1803 // This is a helper class for the 'shared memory bookkeeping' below.
1804 class AddrRange {
1805 friend class ShmBkBlock;
1806
1807 char* _start;
1808 size_t _size;
1809
1810 public:
1811
1812 AddrRange(char* start, size_t size)
1813 : _start(start), _size(size)
1814 {}
1815
1816 AddrRange(const AddrRange& r)
1817 : _start(r.start()), _size(r.size())
1818 {}
1819
1820 char* start() const { return _start; }
1821 size_t size() const { return _size; }
1822 char* end() const { return _start + _size; }
1823 bool is_empty() const { return _size == 0 ? true : false; }
1824
1825 static AddrRange empty_range() { return AddrRange(NULL, 0); }
1826
1827 bool contains(const char* p) const {
1828 return start() <= p && end() > p;
1829 }
1830
1831 bool contains(const AddrRange& range) const {
1832 return start() <= range.start() && end() >= range.end();
1833 }
1834
1835 bool intersects(const AddrRange& range) const {
1836 return (range.start() <= start() && range.end() > start()) ||
1837 (range.start() < end() && range.end() >= end()) ||
1838 contains(range);
1839 }
1840
1841 bool is_same_range(const AddrRange& range) const {
1842 return start() == range.start() && size() == range.size();
1843 }
1844
1845 // return the closest inside range consisting of whole pages
1846 AddrRange find_closest_aligned_range(size_t pagesize) const {
1847 if (pagesize == 0 || is_empty()) {
1848 return empty_range();
1849 }
1850 char* const from = (char*)align_size_up((intptr_t)_start, pagesize);
1851 char* const to = (char*)align_size_down((intptr_t)end(), pagesize);
1852 if (from > to) {
1853 return empty_range();
1854 }
1855 return AddrRange(from, to - from);
1856 }
1857 };
1858
1859 ////////////////////////////////////////////////////////////////////////////
1860 // shared memory bookkeeping
1861 //
1862 // the os::reserve_memory() API and friends hand out different kind of memory, depending
1863 // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat.
1864 //
1865 // But these memory types have to be treated differently. For example, to uncommit
1866 // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory,
1867 // disclaim64() is needed.
1868 //
1869 // Therefore we need to keep track of the allocated memory segments and their
1870 // properties.
1871
1872 // ShmBkBlock: base class for all blocks in the shared memory bookkeeping
1873 class ShmBkBlock {
1874
1875 ShmBkBlock* _next;
1876
1877 protected:
1878
1879 AddrRange _range;
1880 const size_t _pagesize;
1881 const bool _pinned;
1882
1883 public:
1884
1885 ShmBkBlock(AddrRange range, size_t pagesize, bool pinned)
1886 : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) {
1887
1888 assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size");
1889 assert(!_range.is_empty(), "invalid range");
1890 }
1891
1892 virtual void print(outputStream* st) const {
1893 st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s",
1894 _range.start(), _range.end(), _range.size(),
1895 _range.size() / _pagesize, describe_pagesize(_pagesize),
1896 _pinned ? "pinned" : "");
1897 }
1898
1899 enum Type { MMAP, SHMAT };
1900 virtual Type getType() = 0;
1901
1902 char* base() const { return _range.start(); }
1903 size_t size() const { return _range.size(); }
1904
1905 void setAddrRange(AddrRange range) {
1906 _range = range;
1907 }
1908
1909 bool containsAddress(const char* p) const {
1910 return _range.contains(p);
1911 }
1912
1913 bool containsRange(const char* p, size_t size) const {
1914 return _range.contains(AddrRange((char*)p, size));
1915 }
1916
1917 bool isSameRange(const char* p, size_t size) const {
1918 return _range.is_same_range(AddrRange((char*)p, size));
1919 }
1920
1921 virtual bool disclaim(char* p, size_t size) = 0;
1922 virtual bool release() = 0;
1923
1924 // blocks live in a list.
1925 ShmBkBlock* next() const { return _next; }
1926 void set_next(ShmBkBlock* blk) { _next = blk; }
1927
1928 }; // end: ShmBkBlock
1929
1930
1931 // ShmBkMappedBlock: describes an block allocated with mmap()
1932 class ShmBkMappedBlock : public ShmBkBlock {
1933 public:
1934
1935 ShmBkMappedBlock(AddrRange range)
1936 : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned
1937
1938 void print(outputStream* st) const {
1939 ShmBkBlock::print(st);
1940 st->print_cr(" - mmap'ed");
1941 }
1942
1943 Type getType() {
1944 return MMAP;
1945 }
1946
1947 bool disclaim(char* p, size_t size) {
1948
1949 AddrRange r(p, size);
1950
1951 guarantee(_range.contains(r), "invalid disclaim");
1952
1953 // only disclaim whole ranges.
1954 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
1955 if (r2.is_empty()) {
1956 return true;
1957 }
1958
1959 const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE);
1960
1961 if (rc != 0) {
1962 warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno);
1963 }
1964
1965 return rc == 0 ? true : false;
1966 }
1967
1968 bool release() {
1969 // mmap'ed blocks are released using munmap
1970 if (::munmap(_range.start(), _range.size()) != 0) {
1971 warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno);
1972 return false;
1973 }
1974 return true;
1975 }
1976 }; // end: ShmBkMappedBlock
1977
1978 // ShmBkShmatedBlock: describes an block allocated with shmget/shmat()
1979 class ShmBkShmatedBlock : public ShmBkBlock {
1980 public:
1981
1982 ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned)
1983 : ShmBkBlock(range, pagesize, pinned) {}
1984
1985 void print(outputStream* st) const {
1986 ShmBkBlock::print(st);
1987 st->print_cr(" - shmat'ed");
1988 }
1989
1990 Type getType() {
1991 return SHMAT;
1992 }
1993
1994 bool disclaim(char* p, size_t size) {
1995
1996 AddrRange r(p, size);
1997
1998 if (_pinned) {
1999 return true;
2000 }
2001
2002 // shmat'ed blocks are disclaimed using disclaim64
2003 guarantee(_range.contains(r), "invalid disclaim");
2004
2005 // only disclaim whole ranges.
2006 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
2007 if (r2.is_empty()) {
2008 return true;
2009 }
2010
2011 const bool rc = my_disclaim64(r2.start(), r2.size());
2012
2013 if (Verbose && !rc) {
2014 warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end());
2015 }
2016
2017 return rc;
2018 }
2019
2020 bool release() {
2021 bool rc = false;
2022 if (::shmdt(_range.start()) != 0) {
2023 warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno);
2024 } else {
2025 rc = true;
2026 }
2027 return rc;
2028 }
2029
2030 }; // end: ShmBkShmatedBlock
2031
2032 static ShmBkBlock* g_shmbk_list = NULL;
2033 static volatile jint g_shmbk_table_lock = 0;
2034
2035 // keep some usage statistics
2036 static struct {
2037 int nodes; // number of nodes in list
2038 size_t bytes; // reserved - not committed - bytes.
2039 int reserves; // how often reserve was called
2040 int lookups; // how often a lookup was made
2041 } g_shmbk_stats = { 0, 0, 0, 0 };
2042
2043 // add information about a shared memory segment to the bookkeeping
2044 static void shmbk_register(ShmBkBlock* p_block) {
2045 guarantee(p_block, "logic error");
2046 p_block->set_next(g_shmbk_list);
2047 g_shmbk_list = p_block;
2048 g_shmbk_stats.reserves ++;
2049 g_shmbk_stats.bytes += p_block->size();
2050 g_shmbk_stats.nodes ++;
2051 }
2052
2053 // remove information about a shared memory segment by its starting address
2054 static void shmbk_unregister(ShmBkBlock* p_block) {
2055 ShmBkBlock* p = g_shmbk_list;
2056 ShmBkBlock* prev = NULL;
2057 while (p) {
2058 if (p == p_block) {
2059 if (prev) {
2060 prev->set_next(p->next());
2061 } else {
2062 g_shmbk_list = p->next();
2063 }
2064 g_shmbk_stats.nodes --;
2065 g_shmbk_stats.bytes -= p->size();
2066 return;
2067 }
2068 prev = p;
2069 p = p->next();
2070 }
2071 assert(false, "should not happen");
2072 }
2073
2074 // given a pointer, return shared memory bookkeeping record for the segment it points into
2075 // using the returned block info must happen under lock protection
2076 static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) {
2077 g_shmbk_stats.lookups ++;
2078 ShmBkBlock* p = g_shmbk_list;
2079 while (p) {
2080 if (p->containsAddress(addr)) {
2081 return p;
2082 }
2083 p = p->next();
2084 }
2085 return NULL;
2086 }
2087
2088 // dump all information about all memory segments allocated with os::reserve_memory()
2089 void shmbk_dump_info() {
2090 tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, "
2091 "total reserves: %d total lookups: %d)",
2092 g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups);
2093 const ShmBkBlock* p = g_shmbk_list;
2094 int i = 0;
2095 while (p) {
2096 p->print(tty);
2097 p = p->next();
2098 i ++;
2099 }
2100 }
2101
2102 #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK;
2103 #define UNLOCK_SHMBK }
2104
2105 // End: shared memory bookkeeping
2106 ////////////////////////////////////////////////////////////////////////////////////////////////////
2107
2108 int os::vm_page_size() {
2109 // Seems redundant as all get out
2110 assert(os::Aix::page_size() != -1, "must call os::init");
2111 return os::Aix::page_size();
2112 }
2113
2114 // Aix allocates memory by pages.
2115 int os::vm_allocation_granularity() {
2116 assert(os::Aix::page_size() != -1, "must call os::init");
2117 return os::Aix::page_size();
2118 }
2119
2120 int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) {
2121
2122 // Commit is a noop. There is no explicit commit
2123 // needed on AIX. Memory is committed when touched.
2124 //
2125 // Debug : check address range for validity
2126 #ifdef ASSERT
2127 LOCK_SHMBK
2128 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2129 if (!block) {
2130 fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr);
2131 shmbk_dump_info();
2132 assert(false, "invalid pointer");
2133 return false;
2134 } else if (!block->containsRange(addr, size)) {
2135 fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size);
2136 shmbk_dump_info();
2137 assert(false, "invalid range");
2138 return false;
2139 }
2140 UNLOCK_SHMBK
2141 #endif // ASSERT
2142
2143 return 0;
2144 }
2145
2146 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2147 return os::Aix::commit_memory_impl(addr, size, exec) == 0;
2148 }
2149
2150 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2151 const char* mesg) {
2152 assert(mesg != NULL, "mesg must be specified");
2153 os::Aix::commit_memory_impl(addr, size, exec);
2154 }
2155
2156 int os::Aix::commit_memory_impl(char* addr, size_t size,
2157 size_t alignment_hint, bool exec) {
2158 return os::Aix::commit_memory_impl(addr, size, exec);
2159 }
2160
2161 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2162 bool exec) {
2163 return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0;
2164 }
2165
2166 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2167 size_t alignment_hint, bool exec,
2168 const char* mesg) {
2169 os::Aix::commit_memory_impl(addr, size, alignment_hint, exec);
2170 }
2171
2172 bool os::pd_uncommit_memory(char* addr, size_t size) {
2173
2174 // Delegate to ShmBkBlock class which knows how to uncommit its memory.
2175
2176 bool rc = false;
2177 LOCK_SHMBK
2178 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2179 if (!block) {
2180 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2181 shmbk_dump_info();
2182 assert(false, "invalid pointer");
2183 return false;
2184 } else if (!block->containsRange(addr, size)) {
2185 fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size);
2186 shmbk_dump_info();
2187 assert(false, "invalid range");
2188 return false;
2189 }
2190 rc = block->disclaim(addr, size);
2191 UNLOCK_SHMBK
2192
2193 if (Verbose && !rc) {
2194 warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size);
2195 }
2196 return rc;
2197 }
2198
2199 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2200 return os::guard_memory(addr, size);
2201 }
2202
2203 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2204 return os::unguard_memory(addr, size);
2205 }
2206
2207 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2208 }
2209
2210 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2211 }
2212
2213 void os::numa_make_global(char *addr, size_t bytes) {
2214 }
2215
2216 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2217 }
2218
2219 bool os::numa_topology_changed() {
2220 return false;
2221 }
2222
2223 size_t os::numa_get_groups_num() {
2224 return 1;
2225 }
2226
2227 int os::numa_get_group_id() {
2228 return 0;
2229 }
2230
2231 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2232 if (size > 0) {
2233 ids[0] = 0;
2234 return 1;
2235 }
2236 return 0;
2237 }
2238
2239 bool os::get_page_info(char *start, page_info* info) {
2240 return false;
2241 }
2242
2243 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2244 return end;
2245 }
2246
2247 // Flags for reserve_shmatted_memory:
2248 #define RESSHM_WISHADDR_OR_FAIL 1
2249 #define RESSHM_TRY_16M_PAGES 2
2250 #define RESSHM_16M_PAGES_OR_FAIL 4
2251
2252 // Result of reserve_shmatted_memory:
2253 struct shmatted_memory_info_t {
2254 char* addr;
2255 size_t pagesize;
2256 bool pinned;
2257 };
2258
2259 // Reserve a section of shmatted memory.
2260 // params:
2261 // bytes [in]: size of memory, in bytes
2262 // requested_addr [in]: wish address.
2263 // NULL = no wish.
2264 // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot
2265 // be obtained, function will fail. Otherwise wish address is treated as hint and
2266 // another pointer is returned.
2267 // flags [in]: some flags. Valid flags are:
2268 // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained.
2269 // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool
2270 // (requires UseLargePages and Use16MPages)
2271 // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail.
2272 // Otherwise any other page size will do.
2273 // p_info [out] : holds information about the created shared memory segment.
2274 static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) {
2275
2276 assert(p_info, "parameter error");
2277
2278 // init output struct.
2279 p_info->addr = NULL;
2280
2281 // neither should we be here for EXTSHM=ON.
2282 if (os::Aix::extshm()) {
2283 ShouldNotReachHere();
2284 }
2285
2286 // extract flags. sanity checks.
2287 const bool wishaddr_or_fail =
2288 flags & RESSHM_WISHADDR_OR_FAIL;
2289 const bool try_16M_pages =
2290 flags & RESSHM_TRY_16M_PAGES;
2291 const bool f16M_pages_or_fail =
2292 flags & RESSHM_16M_PAGES_OR_FAIL;
2293
2294 // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary,
2295 // shmat will fail anyway, so save some cycles by failing right away
2296 if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) {
2297 if (wishaddr_or_fail) {
2298 return false;
2299 } else {
2300 requested_addr = NULL;
2301 }
2302 }
2303
2304 char* addr = NULL;
2305
2306 // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change
2307 // pagesize dynamically.
2308 const size_t size = align_size_up(bytes, SIZE_16M);
2309
2310 // reserve the shared segment
2311 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2312 if (shmid == -1) {
2313 warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno);
2314 return false;
2315 }
2316
2317 // Important note:
2318 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2319 // We must right after attaching it remove it from the system. System V shm segments are global and
2320 // survive the process.
2321 // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm".
2322
2323 // try forcing the page size
2324 size_t pagesize = -1; // unknown so far
2325
2326 if (UseLargePages) {
2327
2328 struct shmid_ds shmbuf;
2329 memset(&shmbuf, 0, sizeof(shmbuf));
2330
2331 // First, try to take from 16M page pool if...
2332 if (os::Aix::can_use_16M_pages() // we can ...
2333 && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages)..
2334 && try_16M_pages) { // caller wants us to.
2335 shmbuf.shm_pagesize = SIZE_16M;
2336 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2337 pagesize = SIZE_16M;
2338 } else {
2339 warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)",
2340 size / SIZE_16M, errno);
2341 if (f16M_pages_or_fail) {
2342 goto cleanup_shm;
2343 }
2344 }
2345 }
2346
2347 // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might,
2348 // because the 64K page pool may also be exhausted.
2349 if (pagesize == -1) {
2350 shmbuf.shm_pagesize = SIZE_64K;
2351 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2352 pagesize = SIZE_64K;
2353 } else {
2354 warning("Failed to allocate %d 64K pages. (shmctl failed with %d)",
2355 size / SIZE_64K, errno);
2356 // here I give up. leave page_size -1 - later, after attaching, we will query the
2357 // real page size of the attached memory. (in theory, it may be something different
2358 // from 4K if LDR_CNTRL SHM_PSIZE is set)
2359 }
2360 }
2361 }
2362
2363 // sanity point
2364 assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size");
2365
2366 // Now attach the shared segment.
2367 addr = (char*) shmat(shmid, requested_addr, 0);
2368 if (addr == (char*)-1) {
2369 // How to handle attach failure:
2370 // If it failed for a specific wish address, tolerate this: in that case, if wish address was
2371 // mandatory, fail, if not, retry anywhere.
2372 // If it failed for any other reason, treat that as fatal error.
2373 addr = NULL;
2374 if (requested_addr) {
2375 if (wishaddr_or_fail) {
2376 goto cleanup_shm;
2377 } else {
2378 addr = (char*) shmat(shmid, NULL, 0);
2379 if (addr == (char*)-1) { // fatal
2380 addr = NULL;
2381 warning("shmat failed (errno: %d)", errno);
2382 goto cleanup_shm;
2383 }
2384 }
2385 } else { // fatal
2386 addr = NULL;
2387 warning("shmat failed (errno: %d)", errno);
2388 goto cleanup_shm;
2389 }
2390 }
2391
2392 // sanity point
2393 assert(addr && addr != (char*) -1, "wrong address");
2394
2395 // after successful Attach remove the segment - right away.
2396 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2397 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2398 guarantee(false, "failed to remove shared memory segment!");
2399 }
2400 shmid = -1;
2401
2402 // query the real page size. In case setting the page size did not work (see above), the system
2403 // may have given us something other then 4K (LDR_CNTRL)
2404 {
2405 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2406 if (pagesize != -1) {
2407 assert(pagesize == real_pagesize, "unexpected pagesize after shmat");
2408 } else {
2409 pagesize = real_pagesize;
2410 }
2411 }
2412
2413 // Now register the reserved block with internal book keeping.
2414 LOCK_SHMBK
2415 const bool pinned = pagesize >= SIZE_16M ? true : false;
2416 ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned);
2417 assert(p_block, "");
2418 shmbk_register(p_block);
2419 UNLOCK_SHMBK
2420
2421 cleanup_shm:
2422
2423 // if we have not done so yet, remove the shared memory segment. This is very important.
2424 if (shmid != -1) {
2425 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2426 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2427 guarantee(false, "failed to remove shared memory segment!");
2428 }
2429 shmid = -1;
2430 }
2431
2432 // trace
2433 if (Verbose && !addr) {
2434 if (requested_addr != NULL) {
2435 warning("failed to shm-allocate 0x%llX bytes at wish address 0x%p.", size, requested_addr);
2436 } else {
2437 warning("failed to shm-allocate 0x%llX bytes at any address.", size);
2438 }
2439 }
2440
2441 // hand info to caller
2442 if (addr) {
2443 p_info->addr = addr;
2444 p_info->pagesize = pagesize;
2445 p_info->pinned = pagesize == SIZE_16M ? true : false;
2446 }
2447
2448 // sanity test:
2449 if (requested_addr && addr && wishaddr_or_fail) {
2450 guarantee(addr == requested_addr, "shmat error");
2451 }
2452
2453 // just one more test to really make sure we have no dangling shm segments.
2454 guarantee(shmid == -1, "dangling shm segments");
2455
2456 return addr ? true : false;
2457
2458 } // end: reserve_shmatted_memory
2459
2460 // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory():
2461 // will return NULL in case of an error.
2462 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) {
2463
2464 // if a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2465 if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) {
2466 warning("Wish address 0x%p not aligned to page boundary.", requested_addr);
2467 return NULL;
2468 }
2469
2470 const size_t size = align_size_up(bytes, SIZE_4K);
2471
2472 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2473 // msync(MS_INVALIDATE) (see os::uncommit_memory)
2474 int flags = MAP_ANONYMOUS | MAP_SHARED;
2475
2476 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2477 // it means if wishaddress is given but MAP_FIXED is not set.
2478 //
2479 // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED
2480 // clobbers the address range, which is probably not what the caller wants. That's
2481 // why I assert here (again) that the SPEC1170 compat mode is off.
2482 // If we want to be able to run under SPEC1170, we have to do some porting and
2483 // testing.
2484 if (requested_addr != NULL) {
2485 assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed.");
2486 flags |= MAP_FIXED;
2487 }
2488
2489 char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2490
2491 if (addr == MAP_FAILED) {
2492 // attach failed: tolerate for specific wish addresses. Not being able to attach
2493 // anywhere is a fatal error.
2494 if (requested_addr == NULL) {
2495 // It's ok to fail here if the machine has not enough memory.
2496 warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno);
2497 }
2498 addr = NULL;
2499 goto cleanup_mmap;
2500 }
2501
2502 // If we did request a specific address and that address was not available, fail.
2503 if (addr && requested_addr) {
2504 guarantee(addr == requested_addr, "unexpected");
2505 }
2506
2507 // register this mmap'ed segment with book keeping
2508 LOCK_SHMBK
2509 ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size));
2510 assert(p_block, "");
2511 shmbk_register(p_block);
2512 UNLOCK_SHMBK
2513
2514 cleanup_mmap:
2515
2516 // trace
2517 if (Verbose) {
2518 if (addr) {
2519 fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes);
2520 }
2521 else {
2522 if (requested_addr != NULL) {
2523 warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr);
2524 } else {
2525 warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes);
2526 }
2527 }
2528 }
2529
2530 return addr;
2531
2532 } // end: reserve_mmaped_memory
2533
2534 // Reserves and attaches a shared memory segment.
2535 // Will assert if a wish address is given and could not be obtained.
2536 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2537 return os::attempt_reserve_memory_at(bytes, requested_addr);
2538 }
2539
2540 bool os::pd_release_memory(char* addr, size_t size) {
2541
2542 // delegate to ShmBkBlock class which knows how to uncommit its memory.
2543
2544 bool rc = false;
2545 LOCK_SHMBK
2546 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2547 if (!block) {
2548 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2549 shmbk_dump_info();
2550 assert(false, "invalid pointer");
2551 return false;
2552 }
2553 else if (!block->isSameRange(addr, size)) {
2554 if (block->getType() == ShmBkBlock::MMAP) {
2555 // Release only the same range or a the beginning or the end of a range.
2556 if (block->base() == addr && size < block->size()) {
2557 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size));
2558 assert(b, "");
2559 shmbk_register(b);
2560 block->setAddrRange(AddrRange(addr, size));
2561 }
2562 else if (addr > block->base() && addr + size == block->base() + block->size()) {
2563 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size));
2564 assert(b, "");
2565 shmbk_register(b);
2566 block->setAddrRange(AddrRange(addr, size));
2567 }
2568 else {
2569 fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size);
2570 shmbk_dump_info();
2571 assert(false, "invalid mmap range");
2572 return false;
2573 }
2574 }
2575 else {
2576 // Release only the same range. No partial release allowed.
2577 // Soften the requirement a bit, because the user may think he owns a smaller size
2578 // than the block is due to alignment etc.
2579 if (block->base() != addr || block->size() < size) {
2580 fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size);
2581 shmbk_dump_info();
2582 assert(false, "invalid shmget range");
2583 return false;
2584 }
2585 }
2586 }
2587 rc = block->release();
2588 assert(rc, "release failed");
2589 // remove block from bookkeeping
2590 shmbk_unregister(block);
2591 delete block;
2592 UNLOCK_SHMBK
2593
2594 if (!rc) {
2595 warning("failed to released %lu bytes at 0x%p", size, addr);
2596 }
2597
2598 return rc;
2599 }
2600
2601 static bool checked_mprotect(char* addr, size_t size, int prot) {
2602
2603 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2604 // not tell me if protection failed when trying to protect an un-protectable range.
2605 //
2606 // This means if the memory was allocated using shmget/shmat, protection wont work
2607 // but mprotect will still return 0:
2608 //
2609 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2610
2611 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2612
2613 if (!rc) {
2614 const char* const s_errno = strerror(errno);
2615 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2616 return false;
2617 }
2618
2619 // mprotect success check
2620 //
2621 // Mprotect said it changed the protection but can I believe it?
2622 //
2623 // To be sure I need to check the protection afterwards. Try to
2624 // read from protected memory and check whether that causes a segfault.
2625 //
2626 if (!os::Aix::xpg_sus_mode()) {
2627
2628 if (StubRoutines::SafeFetch32_stub()) {
2629
2630 const bool read_protected =
2631 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2632 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2633
2634 if (prot & PROT_READ) {
2635 rc = !read_protected;
2636 } else {
2637 rc = read_protected;
2638 }
2639 }
2640 }
2641 if (!rc) {
2642 assert(false, "mprotect failed.");
2643 }
2644 return rc;
2645 }
2646
2647 // Set protections specified
2648 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2649 unsigned int p = 0;
2650 switch (prot) {
2651 case MEM_PROT_NONE: p = PROT_NONE; break;
2652 case MEM_PROT_READ: p = PROT_READ; break;
2653 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2654 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2655 default:
2656 ShouldNotReachHere();
2657 }
2658 // is_committed is unused.
2659 return checked_mprotect(addr, size, p);
2660 }
2661
2662 bool os::guard_memory(char* addr, size_t size) {
2663 return checked_mprotect(addr, size, PROT_NONE);
2664 }
2665
2666 bool os::unguard_memory(char* addr, size_t size) {
2667 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2668 }
2669
2670 // Large page support
2671
2672 static size_t _large_page_size = 0;
2673
2674 // Enable large page support if OS allows that.
2675 void os::large_page_init() {
2676
2677 // Note: os::Aix::query_multipage_support must run first.
2678
2679 if (!UseLargePages) {
2680 return;
2681 }
2682
2683 if (!Aix::can_use_64K_pages()) {
2684 assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M.");
2685 UseLargePages = false;
2686 return;
2687 }
2688
2689 if (!Aix::can_use_16M_pages() && Use16MPages) {
2690 fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool "
2691 " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n");
2692 }
2693
2694 // Do not report 16M page alignment as part of os::_page_sizes if we are
2695 // explicitly forbidden from using 16M pages. Doing so would increase the
2696 // alignment the garbage collector calculates with, slightly increasing
2697 // heap usage. We should only pay for 16M alignment if we really want to
2698 // use 16M pages.
2699 if (Use16MPages && Aix::can_use_16M_pages()) {
2700 _large_page_size = SIZE_16M;
2701 _page_sizes[0] = SIZE_16M;
2702 _page_sizes[1] = SIZE_64K;
2703 _page_sizes[2] = SIZE_4K;
2704 _page_sizes[3] = 0;
2705 } else if (Aix::can_use_64K_pages()) {
2706 _large_page_size = SIZE_64K;
2707 _page_sizes[0] = SIZE_64K;
2708 _page_sizes[1] = SIZE_4K;
2709 _page_sizes[2] = 0;
2710 }
2711
2712 if (Verbose) {
2713 ("Default large page size is 0x%llX.", _large_page_size);
2714 }
2715 } // end: os::large_page_init()
2716
2717 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2718 // "exec" is passed in but not used. Creating the shared image for
2719 // the code cache doesn't have an SHM_X executable permission to check.
2720 Unimplemented();
2721 return 0;
2722 }
2723
2724 bool os::release_memory_special(char* base, size_t bytes) {
2725 // detaching the SHM segment will also delete it, see reserve_memory_special()
2726 Unimplemented();
2727 return false;
2728 }
2729
2730 size_t os::large_page_size() {
2731 return _large_page_size;
2732 }
2733
2734 bool os::can_commit_large_page_memory() {
2735 // Well, sadly we cannot commit anything at all (see comment in
2736 // os::commit_memory) but we claim to so we can make use of large pages
2737 return true;
2738 }
2739
2740 bool os::can_execute_large_page_memory() {
2741 // We can do that
2742 return true;
2743 }
2744
2745 // Reserve memory at an arbitrary address, only if that area is
2746 // available (and not reserved for something else).
2747 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2748
2749 bool use_mmap = false;
2750
2751 // mmap: smaller graining, no large page support
2752 // shm: large graining (256M), large page support, limited number of shm segments
2753 //
2754 // Prefer mmap wherever we either do not need large page support or have OS limits
2755
2756 if (!UseLargePages || bytes < SIZE_16M) {
2757 use_mmap = true;
2758 }
2759
2760 char* addr = NULL;
2761 if (use_mmap) {
2762 addr = reserve_mmaped_memory(bytes, requested_addr);
2763 } else {
2764 // shmat: wish address is mandatory, and do not try 16M pages here.
2765 shmatted_memory_info_t info;
2766 const int flags = RESSHM_WISHADDR_OR_FAIL;
2767 if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) {
2768 addr = info.addr;
2769 }
2770 }
2771
2772 return addr;
2773 }
2774
2775 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2776 return ::read(fd, buf, nBytes);
2777 }
2778
2779 void os::naked_short_sleep(jlong ms) {
2780 struct timespec req;
2781
2782 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2783 req.tv_sec = 0;
2784 if (ms > 0) {
2785 req.tv_nsec = (ms % 1000) * 1000000;
2786 }
2787 else {
2788 req.tv_nsec = 1;
2789 }
2790
2791 nanosleep(&req, NULL);
2792
2793 return;
2794 }
2795
2796 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2797 void os::infinite_sleep() {
2798 while (true) { // sleep forever ...
2799 ::sleep(100); // ... 100 seconds at a time
2800 }
2801 }
2802
2803 // Used to convert frequent JVM_Yield() to nops
2804 bool os::dont_yield() {
2805 return DontYieldALot;
2806 }
2807
2808 void os::yield() {
2809 sched_yield();
2810 }
2811
2812 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN; }
2813
2814 void os::yield_all(int attempts) {
2815 // Yields to all threads, including threads with lower priorities
2816 // Threads on Linux are all with same priority. The Solaris style
2817 // os::yield_all() with nanosleep(1ms) is not necessary.
2818 sched_yield();
2819 }
2820
2821 // Called from the tight loops to possibly influence time-sharing heuristics
2822 void os::loop_breaker(int attempts) {
2823 os::yield_all(attempts);
2824 }
2825
2826 ////////////////////////////////////////////////////////////////////////////////
2827 // thread priority support
2828
2829 // From AIX manpage to pthread_setschedparam
2830 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2831 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2832 //
2833 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2834 // range from 40 to 80, where 40 is the least favored priority and 80
2835 // is the most favored."
2836 //
2837 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2838 // scheduling there; however, this still leaves iSeries.)
2839 //
2840 // We use the same values for AIX and PASE.
2841 int os::java_to_os_priority[CriticalPriority + 1] = {
2842 54, // 0 Entry should never be used
2843
2844 55, // 1 MinPriority
2845 55, // 2
2846 56, // 3
2847
2848 56, // 4
2849 57, // 5 NormPriority
2850 57, // 6
2851
2852 58, // 7
2853 58, // 8
2854 59, // 9 NearMaxPriority
2855
2856 60, // 10 MaxPriority
2857
2858 60 // 11 CriticalPriority
2859 };
2860
2861 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2862 if (!UseThreadPriorities) return OS_OK;
2863 pthread_t thr = thread->osthread()->pthread_id();
2864 int policy = SCHED_OTHER;
2865 struct sched_param param;
2866 param.sched_priority = newpri;
2867 int ret = pthread_setschedparam(thr, policy, ¶m);
2868
2869 if (Verbose) {
2870 if (ret == 0) {
2871 fprintf(stderr, "changed priority of thread %d to %d\n", (int)thr, newpri);
2872 } else {
2873 fprintf(stderr, "Could not changed priority for thread %d to %d (error %d, %s)\n",
2874 (int)thr, newpri, ret, strerror(ret));
2875 }
2876 }
2877 return (ret == 0) ? OS_OK : OS_ERR;
2878 }
2879
2880 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2881 if (!UseThreadPriorities) {
2882 *priority_ptr = java_to_os_priority[NormPriority];
2883 return OS_OK;
2884 }
2885 pthread_t thr = thread->osthread()->pthread_id();
2886 int policy = SCHED_OTHER;
2887 struct sched_param param;
2888 int ret = pthread_getschedparam(thr, &policy, ¶m);
2889 *priority_ptr = param.sched_priority;
2890
2891 return (ret == 0) ? OS_OK : OS_ERR;
2892 }
2893
2894 // Hint to the underlying OS that a task switch would not be good.
2895 // Void return because it's a hint and can fail.
2896 void os::hint_no_preempt() {}
2897
2898 ////////////////////////////////////////////////////////////////////////////////
2899 // suspend/resume support
2900
2901 // the low-level signal-based suspend/resume support is a remnant from the
2902 // old VM-suspension that used to be for java-suspension, safepoints etc,
2903 // within hotspot. Now there is a single use-case for this:
2904 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2905 // that runs in the watcher thread.
2906 // The remaining code is greatly simplified from the more general suspension
2907 // code that used to be used.
2908 //
2909 // The protocol is quite simple:
2910 // - suspend:
2911 // - sends a signal to the target thread
2912 // - polls the suspend state of the osthread using a yield loop
2913 // - target thread signal handler (SR_handler) sets suspend state
2914 // and blocks in sigsuspend until continued
2915 // - resume:
2916 // - sets target osthread state to continue
2917 // - sends signal to end the sigsuspend loop in the SR_handler
2918 //
2919 // Note that the SR_lock plays no role in this suspend/resume protocol.
2920 //
2921
2922 static void resume_clear_context(OSThread *osthread) {
2923 osthread->set_ucontext(NULL);
2924 osthread->set_siginfo(NULL);
2925 }
2926
2927 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2928 osthread->set_ucontext(context);
2929 osthread->set_siginfo(siginfo);
2930 }
2931
2932 //
2933 // Handler function invoked when a thread's execution is suspended or
2934 // resumed. We have to be careful that only async-safe functions are
2935 // called here (Note: most pthread functions are not async safe and
2936 // should be avoided.)
2937 //
2938 // Note: sigwait() is a more natural fit than sigsuspend() from an
2939 // interface point of view, but sigwait() prevents the signal hander
2940 // from being run. libpthread would get very confused by not having
2941 // its signal handlers run and prevents sigwait()'s use with the
2942 // mutex granting granting signal.
2943 //
2944 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2945 //
2946 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2947 // Save and restore errno to avoid confusing native code with EINTR
2948 // after sigsuspend.
2949 int old_errno = errno;
2950
2951 Thread* thread = Thread::current();
2952 OSThread* osthread = thread->osthread();
2953 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2954
2955 os::SuspendResume::State current = osthread->sr.state();
2956 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2957 suspend_save_context(osthread, siginfo, context);
2958
2959 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2960 os::SuspendResume::State state = osthread->sr.suspended();
2961 if (state == os::SuspendResume::SR_SUSPENDED) {
2962 sigset_t suspend_set; // signals for sigsuspend()
2963
2964 // get current set of blocked signals and unblock resume signal
2965 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2966 sigdelset(&suspend_set, SR_signum);
2967
2968 // wait here until we are resumed
2969 while (1) {
2970 sigsuspend(&suspend_set);
2971
2972 os::SuspendResume::State result = osthread->sr.running();
2973 if (result == os::SuspendResume::SR_RUNNING) {
2974 break;
2975 }
2976 }
2977
2978 } else if (state == os::SuspendResume::SR_RUNNING) {
2979 // request was cancelled, continue
2980 } else {
2981 ShouldNotReachHere();
2982 }
2983
2984 resume_clear_context(osthread);
2985 } else if (current == os::SuspendResume::SR_RUNNING) {
2986 // request was cancelled, continue
2987 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2988 // ignore
2989 } else {
2990 ShouldNotReachHere();
2991 }
2992
2993 errno = old_errno;
2994 }
2995
2996
2997 static int SR_initialize() {
2998 struct sigaction act;
2999 char *s;
3000 // Get signal number to use for suspend/resume
3001 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
3002 int sig = ::strtol(s, 0, 10);
3003 if (sig > 0 || sig < NSIG) {
3004 SR_signum = sig;
3005 }
3006 }
3007
3008 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
3009 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
3010
3011 sigemptyset(&SR_sigset);
3012 sigaddset(&SR_sigset, SR_signum);
3013
3014 // Set up signal handler for suspend/resume.
3015 act.sa_flags = SA_RESTART|SA_SIGINFO;
3016 act.sa_handler = (void (*)(int)) SR_handler;
3017
3018 // SR_signum is blocked by default.
3019 // 4528190 - We also need to block pthread restart signal (32 on all
3020 // supported Linux platforms). Note that LinuxThreads need to block
3021 // this signal for all threads to work properly. So we don't have
3022 // to use hard-coded signal number when setting up the mask.
3023 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
3024
3025 if (sigaction(SR_signum, &act, 0) == -1) {
3026 return -1;
3027 }
3028
3029 // Save signal flag
3030 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
3031 return 0;
3032 }
3033
3034 static int SR_finalize() {
3035 return 0;
3036 }
3037
3038 static int sr_notify(OSThread* osthread) {
3039 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3040 assert_status(status == 0, status, "pthread_kill");
3041 return status;
3042 }
3043
3044 // "Randomly" selected value for how long we want to spin
3045 // before bailing out on suspending a thread, also how often
3046 // we send a signal to a thread we want to resume
3047 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3048 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3049
3050 // returns true on success and false on error - really an error is fatal
3051 // but this seems the normal response to library errors
3052 static bool do_suspend(OSThread* osthread) {
3053 assert(osthread->sr.is_running(), "thread should be running");
3054 // mark as suspended and send signal
3055
3056 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3057 // failed to switch, state wasn't running?
3058 ShouldNotReachHere();
3059 return false;
3060 }
3061
3062 if (sr_notify(osthread) != 0) {
3063 // try to cancel, switch to running
3064
3065 os::SuspendResume::State result = osthread->sr.cancel_suspend();
3066 if (result == os::SuspendResume::SR_RUNNING) {
3067 // cancelled
3068 return false;
3069 } else if (result == os::SuspendResume::SR_SUSPENDED) {
3070 // somehow managed to suspend
3071 return true;
3072 } else {
3073 ShouldNotReachHere();
3074 return false;
3075 }
3076 }
3077
3078 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3079
3080 for (int n = 0; !osthread->sr.is_suspended(); n++) {
3081 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
3082 os::yield_all(i);
3083 }
3084
3085 // timeout, try to cancel the request
3086 if (n >= RANDOMLY_LARGE_INTEGER) {
3087 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3088 if (cancelled == os::SuspendResume::SR_RUNNING) {
3089 return false;
3090 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3091 return true;
3092 } else {
3093 ShouldNotReachHere();
3094 return false;
3095 }
3096 }
3097 }
3098
3099 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3100 return true;
3101 }
3102
3103 static void do_resume(OSThread* osthread) {
3104 //assert(osthread->sr.is_suspended(), "thread should be suspended");
3105
3106 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3107 // failed to switch to WAKEUP_REQUEST
3108 ShouldNotReachHere();
3109 return;
3110 }
3111
3112 while (!osthread->sr.is_running()) {
3113 if (sr_notify(osthread) == 0) {
3114 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
3115 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
3116 os::yield_all(i);
3117 }
3118 }
3119 } else {
3120 ShouldNotReachHere();
3121 }
3122 }
3123
3124 guarantee(osthread->sr.is_running(), "Must be running!");
3125 }
3126
3127 ///////////////////////////////////////////////////////////////////////////////////
3128 // signal handling (except suspend/resume)
3129
3130 // This routine may be used by user applications as a "hook" to catch signals.
3131 // The user-defined signal handler must pass unrecognized signals to this
3132 // routine, and if it returns true (non-zero), then the signal handler must
3133 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3134 // routine will never retun false (zero), but instead will execute a VM panic
3135 // routine kill the process.
3136 //
3137 // If this routine returns false, it is OK to call it again. This allows
3138 // the user-defined signal handler to perform checks either before or after
3139 // the VM performs its own checks. Naturally, the user code would be making
3140 // a serious error if it tried to handle an exception (such as a null check
3141 // or breakpoint) that the VM was generating for its own correct operation.
3142 //
3143 // This routine may recognize any of the following kinds of signals:
3144 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3145 // It should be consulted by handlers for any of those signals.
3146 //
3147 // The caller of this routine must pass in the three arguments supplied
3148 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3149 // field of the structure passed to sigaction(). This routine assumes that
3150 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3151 //
3152 // Note that the VM will print warnings if it detects conflicting signal
3153 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3154 //
3155 extern "C" JNIEXPORT int
3156 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
3157
3158 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3159 // to be the thing to call; documentation is not terribly clear about whether
3160 // pthread_sigmask also works, and if it does, whether it does the same.
3161 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3162 const int rc = ::pthread_sigmask(how, set, oset);
3163 // return value semantics differ slightly for error case:
3164 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3165 // (so, pthread_sigmask is more theadsafe for error handling)
3166 // But success is always 0.
3167 return rc == 0 ? true : false;
3168 }
3169
3170 // Function to unblock all signals which are, according
3171 // to POSIX, typical program error signals. If they happen while being blocked,
3172 // they typically will bring down the process immediately.
3173 bool unblock_program_error_signals() {
3174 sigset_t set;
3175 ::sigemptyset(&set);
3176 ::sigaddset(&set, SIGILL);
3177 ::sigaddset(&set, SIGBUS);
3178 ::sigaddset(&set, SIGFPE);
3179 ::sigaddset(&set, SIGSEGV);
3180 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3181 }
3182
3183 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3184 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3185 assert(info != NULL && uc != NULL, "it must be old kernel");
3186
3187 // Never leave program error signals blocked;
3188 // on all our platforms they would bring down the process immediately when
3189 // getting raised while being blocked.
3190 unblock_program_error_signals();
3191
3192 JVM_handle_aix_signal(sig, info, uc, true);
3193 }
3194
3195
3196 // This boolean allows users to forward their own non-matching signals
3197 // to JVM_handle_aix_signal, harmlessly.
3198 bool os::Aix::signal_handlers_are_installed = false;
3199
3200 // For signal-chaining
3201 struct sigaction os::Aix::sigact[MAXSIGNUM];
3202 unsigned int os::Aix::sigs = 0;
3203 bool os::Aix::libjsig_is_loaded = false;
3204 typedef struct sigaction *(*get_signal_t)(int);
3205 get_signal_t os::Aix::get_signal_action = NULL;
3206
3207 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3208 struct sigaction *actp = NULL;
3209
3210 if (libjsig_is_loaded) {
3211 // Retrieve the old signal handler from libjsig
3212 actp = (*get_signal_action)(sig);
3213 }
3214 if (actp == NULL) {
3215 // Retrieve the preinstalled signal handler from jvm
3216 actp = get_preinstalled_handler(sig);
3217 }
3218
3219 return actp;
3220 }
3221
3222 static bool call_chained_handler(struct sigaction *actp, int sig,
3223 siginfo_t *siginfo, void *context) {
3224 // Call the old signal handler
3225 if (actp->sa_handler == SIG_DFL) {
3226 // It's more reasonable to let jvm treat it as an unexpected exception
3227 // instead of taking the default action.
3228 return false;
3229 } else if (actp->sa_handler != SIG_IGN) {
3230 if ((actp->sa_flags & SA_NODEFER) == 0) {
3231 // automaticlly block the signal
3232 sigaddset(&(actp->sa_mask), sig);
3233 }
3234
3235 sa_handler_t hand = NULL;
3236 sa_sigaction_t sa = NULL;
3237 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3238 // retrieve the chained handler
3239 if (siginfo_flag_set) {
3240 sa = actp->sa_sigaction;
3241 } else {
3242 hand = actp->sa_handler;
3243 }
3244
3245 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3246 actp->sa_handler = SIG_DFL;
3247 }
3248
3249 // try to honor the signal mask
3250 sigset_t oset;
3251 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3252
3253 // call into the chained handler
3254 if (siginfo_flag_set) {
3255 (*sa)(sig, siginfo, context);
3256 } else {
3257 (*hand)(sig);
3258 }
3259
3260 // restore the signal mask
3261 pthread_sigmask(SIG_SETMASK, &oset, 0);
3262 }
3263 // Tell jvm's signal handler the signal is taken care of.
3264 return true;
3265 }
3266
3267 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3268 bool chained = false;
3269 // signal-chaining
3270 if (UseSignalChaining) {
3271 struct sigaction *actp = get_chained_signal_action(sig);
3272 if (actp != NULL) {
3273 chained = call_chained_handler(actp, sig, siginfo, context);
3274 }
3275 }
3276 return chained;
3277 }
3278
3279 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3280 if ((((unsigned int)1 << sig) & sigs) != 0) {
3281 return &sigact[sig];
3282 }
3283 return NULL;
3284 }
3285
3286 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3287 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3288 sigact[sig] = oldAct;
3289 sigs |= (unsigned int)1 << sig;
3290 }
3291
3292 // for diagnostic
3293 int os::Aix::sigflags[MAXSIGNUM];
3294
3295 int os::Aix::get_our_sigflags(int sig) {
3296 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3297 return sigflags[sig];
3298 }
3299
3300 void os::Aix::set_our_sigflags(int sig, int flags) {
3301 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3302 sigflags[sig] = flags;
3303 }
3304
3305 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3306 // Check for overwrite.
3307 struct sigaction oldAct;
3308 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3309
3310 void* oldhand = oldAct.sa_sigaction
3311 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3312 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3313 // Renamed 'signalHandler' to avoid collision with other shared libs.
3314 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3315 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3316 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3317 if (AllowUserSignalHandlers || !set_installed) {
3318 // Do not overwrite; user takes responsibility to forward to us.
3319 return;
3320 } else if (UseSignalChaining) {
3321 // save the old handler in jvm
3322 save_preinstalled_handler(sig, oldAct);
3323 // libjsig also interposes the sigaction() call below and saves the
3324 // old sigaction on it own.
3325 } else {
3326 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3327 "%#lx for signal %d.", (long)oldhand, sig));
3328 }
3329 }
3330
3331 struct sigaction sigAct;
3332 sigfillset(&(sigAct.sa_mask));
3333 if (!set_installed) {
3334 sigAct.sa_handler = SIG_DFL;
3335 sigAct.sa_flags = SA_RESTART;
3336 } else {
3337 // Renamed 'signalHandler' to avoid collision with other shared libs.
3338 sigAct.sa_sigaction = javaSignalHandler;
3339 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3340 }
3341 // Save flags, which are set by ours
3342 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3343 sigflags[sig] = sigAct.sa_flags;
3344
3345 int ret = sigaction(sig, &sigAct, &oldAct);
3346 assert(ret == 0, "check");
3347
3348 void* oldhand2 = oldAct.sa_sigaction
3349 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3350 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3351 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3352 }
3353
3354 // install signal handlers for signals that HotSpot needs to
3355 // handle in order to support Java-level exception handling.
3356 void os::Aix::install_signal_handlers() {
3357 if (!signal_handlers_are_installed) {
3358 signal_handlers_are_installed = true;
3359
3360 // signal-chaining
3361 typedef void (*signal_setting_t)();
3362 signal_setting_t begin_signal_setting = NULL;
3363 signal_setting_t end_signal_setting = NULL;
3364 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3365 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3366 if (begin_signal_setting != NULL) {
3367 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3368 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3369 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3370 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3371 libjsig_is_loaded = true;
3372 assert(UseSignalChaining, "should enable signal-chaining");
3373 }
3374 if (libjsig_is_loaded) {
3375 // Tell libjsig jvm is setting signal handlers
3376 (*begin_signal_setting)();
3377 }
3378
3379 set_signal_handler(SIGSEGV, true);
3380 set_signal_handler(SIGPIPE, true);
3381 set_signal_handler(SIGBUS, true);
3382 set_signal_handler(SIGILL, true);
3383 set_signal_handler(SIGFPE, true);
3384 set_signal_handler(SIGTRAP, true);
3385 set_signal_handler(SIGXFSZ, true);
3386 set_signal_handler(SIGDANGER, true);
3387
3388 if (libjsig_is_loaded) {
3389 // Tell libjsig jvm finishes setting signal handlers
3390 (*end_signal_setting)();
3391 }
3392
3393 // We don't activate signal checker if libjsig is in place, we trust ourselves
3394 // and if UserSignalHandler is installed all bets are off.
3395 // Log that signal checking is off only if -verbose:jni is specified.
3396 if (CheckJNICalls) {
3397 if (libjsig_is_loaded) {
3398 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3399 check_signals = false;
3400 }
3401 if (AllowUserSignalHandlers) {
3402 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3403 check_signals = false;
3404 }
3405 // need to initialize check_signal_done
3406 ::sigemptyset(&check_signal_done);
3407 }
3408 }
3409 }
3410
3411 static const char* get_signal_handler_name(address handler,
3412 char* buf, int buflen) {
3413 int offset;
3414 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3415 if (found) {
3416 // skip directory names
3417 const char *p1, *p2;
3418 p1 = buf;
3419 size_t len = strlen(os::file_separator());
3420 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3421 // The way os::dll_address_to_library_name is implemented on Aix
3422 // right now, it always returns -1 for the offset which is not
3423 // terribly informative.
3424 // Will fix that. For now, omit the offset.
3425 jio_snprintf(buf, buflen, "%s", p1);
3426 } else {
3427 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3428 }
3429 return buf;
3430 }
3431
3432 static void print_signal_handler(outputStream* st, int sig,
3433 char* buf, size_t buflen) {
3434 struct sigaction sa;
3435 sigaction(sig, NULL, &sa);
3436
3437 st->print("%s: ", os::exception_name(sig, buf, buflen));
3438
3439 address handler = (sa.sa_flags & SA_SIGINFO)
3440 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3441 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3442
3443 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3444 st->print("SIG_DFL");
3445 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3446 st->print("SIG_IGN");
3447 } else {
3448 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3449 }
3450
3451 // Print readable mask.
3452 st->print(", sa_mask[0]=");
3453 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3454
3455 address rh = VMError::get_resetted_sighandler(sig);
3456 // May be, handler was resetted by VMError?
3457 if (rh != NULL) {
3458 handler = rh;
3459 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3460 }
3461
3462 // Print textual representation of sa_flags.
3463 st->print(", sa_flags=");
3464 os::Posix::print_sa_flags(st, sa.sa_flags);
3465
3466 // Check: is it our handler?
3467 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3468 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3469 // It is our signal handler.
3470 // Check for flags, reset system-used one!
3471 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3472 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3473 os::Aix::get_our_sigflags(sig));
3474 }
3475 }
3476 st->cr();
3477 }
3478
3479
3480 #define DO_SIGNAL_CHECK(sig) \
3481 if (!sigismember(&check_signal_done, sig)) \
3482 os::Aix::check_signal_handler(sig)
3483
3484 // This method is a periodic task to check for misbehaving JNI applications
3485 // under CheckJNI, we can add any periodic checks here
3486
3487 void os::run_periodic_checks() {
3488
3489 if (check_signals == false) return;
3490
3491 // SEGV and BUS if overridden could potentially prevent
3492 // generation of hs*.log in the event of a crash, debugging
3493 // such a case can be very challenging, so we absolutely
3494 // check the following for a good measure:
3495 DO_SIGNAL_CHECK(SIGSEGV);
3496 DO_SIGNAL_CHECK(SIGILL);
3497 DO_SIGNAL_CHECK(SIGFPE);
3498 DO_SIGNAL_CHECK(SIGBUS);
3499 DO_SIGNAL_CHECK(SIGPIPE);
3500 DO_SIGNAL_CHECK(SIGXFSZ);
3501 if (UseSIGTRAP) {
3502 DO_SIGNAL_CHECK(SIGTRAP);
3503 }
3504 DO_SIGNAL_CHECK(SIGDANGER);
3505
3506 // ReduceSignalUsage allows the user to override these handlers
3507 // see comments at the very top and jvm_solaris.h
3508 if (!ReduceSignalUsage) {
3509 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3510 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3511 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3512 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3513 }
3514
3515 DO_SIGNAL_CHECK(SR_signum);
3516 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3517 }
3518
3519 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3520
3521 static os_sigaction_t os_sigaction = NULL;
3522
3523 void os::Aix::check_signal_handler(int sig) {
3524 char buf[O_BUFLEN];
3525 address jvmHandler = NULL;
3526
3527 struct sigaction act;
3528 if (os_sigaction == NULL) {
3529 // only trust the default sigaction, in case it has been interposed
3530 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3531 if (os_sigaction == NULL) return;
3532 }
3533
3534 os_sigaction(sig, (struct sigaction*)NULL, &act);
3535
3536 address thisHandler = (act.sa_flags & SA_SIGINFO)
3537 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3538 : CAST_FROM_FN_PTR(address, act.sa_handler);
3539
3540
3541 switch(sig) {
3542 case SIGSEGV:
3543 case SIGBUS:
3544 case SIGFPE:
3545 case SIGPIPE:
3546 case SIGILL:
3547 case SIGXFSZ:
3548 // Renamed 'signalHandler' to avoid collision with other shared libs.
3549 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3550 break;
3551
3552 case SHUTDOWN1_SIGNAL:
3553 case SHUTDOWN2_SIGNAL:
3554 case SHUTDOWN3_SIGNAL:
3555 case BREAK_SIGNAL:
3556 jvmHandler = (address)user_handler();
3557 break;
3558
3559 case INTERRUPT_SIGNAL:
3560 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3561 break;
3562
3563 default:
3564 if (sig == SR_signum) {
3565 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3566 } else {
3567 return;
3568 }
3569 break;
3570 }
3571
3572 if (thisHandler != jvmHandler) {
3573 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3574 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3575 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3576 // No need to check this sig any longer
3577 sigaddset(&check_signal_done, sig);
3578 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3579 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3580 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3581 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3582 // No need to check this sig any longer
3583 sigaddset(&check_signal_done, sig);
3584 }
3585
3586 // Dump all the signal
3587 if (sigismember(&check_signal_done, sig)) {
3588 print_signal_handlers(tty, buf, O_BUFLEN);
3589 }
3590 }
3591
3592 extern bool signal_name(int signo, char* buf, size_t len);
3593
3594 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3595 if (0 < exception_code && exception_code <= SIGRTMAX) {
3596 // signal
3597 if (!signal_name(exception_code, buf, size)) {
3598 jio_snprintf(buf, size, "SIG%d", exception_code);
3599 }
3600 return buf;
3601 } else {
3602 return NULL;
3603 }
3604 }
3605
3606 // To install functions for atexit system call
3607 extern "C" {
3608 static void perfMemory_exit_helper() {
3609 perfMemory_exit();
3610 }
3611 }
3612
3613 // This is called _before_ the most of global arguments have been parsed.
3614 void os::init(void) {
3615 // This is basic, we want to know if that ever changes.
3616 // (shared memory boundary is supposed to be a 256M aligned)
3617 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3618
3619 // First off, we need to know whether we run on AIX or PASE, and
3620 // the OS level we run on.
3621 os::Aix::initialize_os_info();
3622
3623 // Scan environment (SPEC1170 behaviour, etc)
3624 os::Aix::scan_environment();
3625
3626 // Check which pages are supported by AIX.
3627 os::Aix::query_multipage_support();
3628
3629 // Next, we need to initialize libo4 and libperfstat libraries.
3630 if (os::Aix::on_pase()) {
3631 os::Aix::initialize_libo4();
3632 } else {
3633 os::Aix::initialize_libperfstat();
3634 }
3635
3636 // Reset the perfstat information provided by ODM.
3637 if (os::Aix::on_aix()) {
3638 libperfstat::perfstat_reset();
3639 }
3640
3641 // Now initialze basic system properties. Note that for some of the values we
3642 // need libperfstat etc.
3643 os::Aix::initialize_system_info();
3644
3645 // Initialize large page support.
3646 if (UseLargePages) {
3647 os::large_page_init();
3648 if (!UseLargePages) {
3649 // initialize os::_page_sizes
3650 _page_sizes[0] = Aix::page_size();
3651 _page_sizes[1] = 0;
3652 if (Verbose) {
3653 fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n");
3654 }
3655 }
3656 } else {
3657 // initialize os::_page_sizes
3658 _page_sizes[0] = Aix::page_size();
3659 _page_sizes[1] = 0;
3660 }
3661
3662 // debug trace
3663 if (Verbose) {
3664 fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size());
3665 fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size());
3666 fprintf(stderr, "os::_page_sizes = ( ");
3667 for (int i = 0; _page_sizes[i]; i ++) {
3668 fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i]));
3669 }
3670 fprintf(stderr, ")\n");
3671 }
3672
3673 _initial_pid = getpid();
3674
3675 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3676
3677 init_random(1234567);
3678
3679 ThreadCritical::initialize();
3680
3681 // Main_thread points to the aboriginal thread.
3682 Aix::_main_thread = pthread_self();
3683
3684 initial_time_count = os::elapsed_counter();
3685 pthread_mutex_init(&dl_mutex, NULL);
3686 }
3687
3688 // this is called _after_ the global arguments have been parsed
3689 jint os::init_2(void) {
3690
3691 if (Verbose) {
3692 fprintf(stderr, "processor count: %d\n", os::_processor_count);
3693 fprintf(stderr, "physical memory: %lu\n", Aix::_physical_memory);
3694 }
3695
3696 // initially build up the loaded dll map
3697 LoadedLibraries::reload();
3698
3699 const int page_size = Aix::page_size();
3700 const int map_size = page_size;
3701
3702 address map_address = (address) MAP_FAILED;
3703 const int prot = PROT_READ;
3704 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3705
3706 // use optimized addresses for the polling page,
3707 // e.g. map it to a special 32-bit address.
3708 if (OptimizePollingPageLocation) {
3709 // architecture-specific list of address wishes:
3710 address address_wishes[] = {
3711 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3712 // PPC64: all address wishes are non-negative 32 bit values where
3713 // the lower 16 bits are all zero. we can load these addresses
3714 // with a single ppc_lis instruction.
3715 (address) 0x30000000, (address) 0x31000000,
3716 (address) 0x32000000, (address) 0x33000000,
3717 (address) 0x40000000, (address) 0x41000000,
3718 (address) 0x42000000, (address) 0x43000000,
3719 (address) 0x50000000, (address) 0x51000000,
3720 (address) 0x52000000, (address) 0x53000000,
3721 (address) 0x60000000, (address) 0x61000000,
3722 (address) 0x62000000, (address) 0x63000000
3723 };
3724 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3725
3726 // iterate over the list of address wishes:
3727 for (int i=0; i<address_wishes_length; i++) {
3728 // try to map with current address wish.
3729 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3730 // fail if the address is already mapped.
3731 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3732 map_size, prot,
3733 flags | MAP_FIXED,
3734 -1, 0);
3735 if (Verbose) {
3736 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3737 address_wishes[i], map_address + (ssize_t)page_size);
3738 }
3739
3740 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3741 // map succeeded and map_address is at wished address, exit loop.
3742 break;
3743 }
3744
3745 if (map_address != (address) MAP_FAILED) {
3746 // map succeeded, but polling_page is not at wished address, unmap and continue.
3747 ::munmap(map_address, map_size);
3748 map_address = (address) MAP_FAILED;
3749 }
3750 // map failed, continue loop.
3751 }
3752 } // end OptimizePollingPageLocation
3753
3754 if (map_address == (address) MAP_FAILED) {
3755 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3756 }
3757 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3758 os::set_polling_page(map_address);
3759
3760 if (!UseMembar) {
3761 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3762 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3763 os::set_memory_serialize_page(mem_serialize_page);
3764
3765 #ifndef PRODUCT
3766 if (Verbose && PrintMiscellaneous)
3767 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3768 #endif
3769 }
3770
3771 // initialize suspend/resume support - must do this before signal_sets_init()
3772 if (SR_initialize() != 0) {
3773 perror("SR_initialize failed");
3774 return JNI_ERR;
3775 }
3776
3777 Aix::signal_sets_init();
3778 Aix::install_signal_handlers();
3779
3780 // Check minimum allowable stack size for thread creation and to initialize
3781 // the java system classes, including StackOverflowError - depends on page
3782 // size. Add a page for compiler2 recursion in main thread.
3783 // Add in 2*BytesPerWord times page size to account for VM stack during
3784 // class initialization depending on 32 or 64 bit VM.
3785 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3786 (size_t)(StackYellowPages+StackRedPages+StackShadowPages +
3787 2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size());
3788
3789 size_t threadStackSizeInBytes = ThreadStackSize * K;
3790 if (threadStackSizeInBytes != 0 &&
3791 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3792 tty->print_cr("\nThe stack size specified is too small, "
3793 "Specify at least %dk",
3794 os::Aix::min_stack_allowed / K);
3795 return JNI_ERR;
3796 }
3797
3798 // Make the stack size a multiple of the page size so that
3799 // the yellow/red zones can be guarded.
3800 // note that this can be 0, if no default stacksize was set
3801 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3802
3803 Aix::libpthread_init();
3804
3805 if (MaxFDLimit) {
3806 // set the number of file descriptors to max. print out error
3807 // if getrlimit/setrlimit fails but continue regardless.
3808 struct rlimit nbr_files;
3809 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3810 if (status != 0) {
3811 if (PrintMiscellaneous && (Verbose || WizardMode))
3812 perror("os::init_2 getrlimit failed");
3813 } else {
3814 nbr_files.rlim_cur = nbr_files.rlim_max;
3815 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3816 if (status != 0) {
3817 if (PrintMiscellaneous && (Verbose || WizardMode))
3818 perror("os::init_2 setrlimit failed");
3819 }
3820 }
3821 }
3822
3823 if (PerfAllowAtExitRegistration) {
3824 // only register atexit functions if PerfAllowAtExitRegistration is set.
3825 // atexit functions can be delayed until process exit time, which
3826 // can be problematic for embedded VM situations. Embedded VMs should
3827 // call DestroyJavaVM() to assure that VM resources are released.
3828
3829 // note: perfMemory_exit_helper atexit function may be removed in
3830 // the future if the appropriate cleanup code can be added to the
3831 // VM_Exit VMOperation's doit method.
3832 if (atexit(perfMemory_exit_helper) != 0) {
3833 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3834 }
3835 }
3836
3837 return JNI_OK;
3838 }
3839
3840 // this is called at the end of vm_initialization
3841 void os::init_3(void) {
3842 return;
3843 }
3844
3845 // Mark the polling page as unreadable
3846 void os::make_polling_page_unreadable(void) {
3847 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3848 fatal("Could not disable polling page");
3849 }
3850 };
3851
3852 // Mark the polling page as readable
3853 void os::make_polling_page_readable(void) {
3854 // Changed according to os_linux.cpp.
3855 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3856 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
3857 }
3858 };
3859
3860 int os::active_processor_count() {
3861 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3862 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3863 return online_cpus;
3864 }
3865
3866 void os::set_native_thread_name(const char *name) {
3867 // Not yet implemented.
3868 return;
3869 }
3870
3871 bool os::distribute_processes(uint length, uint* distribution) {
3872 // Not yet implemented.
3873 return false;
3874 }
3875
3876 bool os::bind_to_processor(uint processor_id) {
3877 // Not yet implemented.
3878 return false;
3879 }
3880
3881 void os::SuspendedThreadTask::internal_do_task() {
3882 if (do_suspend(_thread->osthread())) {
3883 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3884 do_task(context);
3885 do_resume(_thread->osthread());
3886 }
3887 }
3888
3889 class PcFetcher : public os::SuspendedThreadTask {
3890 public:
3891 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3892 ExtendedPC result();
3893 protected:
3894 void do_task(const os::SuspendedThreadTaskContext& context);
3895 private:
3896 ExtendedPC _epc;
3897 };
3898
3899 ExtendedPC PcFetcher::result() {
3900 guarantee(is_done(), "task is not done yet.");
3901 return _epc;
3902 }
3903
3904 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3905 Thread* thread = context.thread();
3906 OSThread* osthread = thread->osthread();
3907 if (osthread->ucontext() != NULL) {
3908 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3909 } else {
3910 // NULL context is unexpected, double-check this is the VMThread.
3911 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3912 }
3913 }
3914
3915 // Suspends the target using the signal mechanism and then grabs the PC before
3916 // resuming the target. Used by the flat-profiler only
3917 ExtendedPC os::get_thread_pc(Thread* thread) {
3918 // Make sure that it is called by the watcher for the VMThread.
3919 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3920 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3921
3922 PcFetcher fetcher(thread);
3923 fetcher.run();
3924 return fetcher.result();
3925 }
3926
3927 // Not neede on Aix.
3928 // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) {
3929 // }
3930
3931 ////////////////////////////////////////////////////////////////////////////////
3932 // debug support
3933
3934 static address same_page(address x, address y) {
3935 intptr_t page_bits = -os::vm_page_size();
3936 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3937 return x;
3938 else if (x > y)
3939 return (address)(intptr_t(y) | ~page_bits) + 1;
3940 else
3941 return (address)(intptr_t(y) & page_bits);
3942 }
3943
3944 bool os::find(address addr, outputStream* st) {
3945
3946 st->print(PTR_FORMAT ": ", addr);
3947
3948 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3949 if (lib) {
3950 lib->print(st);
3951 return true;
3952 } else {
3953 lib = LoadedLibraries::find_for_data_address(addr);
3954 if (lib) {
3955 lib->print(st);
3956 return true;
3957 } else {
3958 st->print_cr("(outside any module)");
3959 }
3960 }
3961
3962 return false;
3963 }
3964
3965 ////////////////////////////////////////////////////////////////////////////////
3966 // misc
3967
3968 // This does not do anything on Aix. This is basically a hook for being
3969 // able to use structured exception handling (thread-local exception filters)
3970 // on, e.g., Win32.
3971 void
3972 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3973 JavaCallArguments* args, Thread* thread) {
3974 f(value, method, args, thread);
3975 }
3976
3977 void os::print_statistics() {
3978 }
3979
3980 int os::message_box(const char* title, const char* message) {
3981 int i;
3982 fdStream err(defaultStream::error_fd());
3983 for (i = 0; i < 78; i++) err.print_raw("=");
3984 err.cr();
3985 err.print_raw_cr(title);
3986 for (i = 0; i < 78; i++) err.print_raw("-");
3987 err.cr();
3988 err.print_raw_cr(message);
3989 for (i = 0; i < 78; i++) err.print_raw("=");
3990 err.cr();
3991
3992 char buf[16];
3993 // Prevent process from exiting upon "read error" without consuming all CPU
3994 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3995
3996 return buf[0] == 'y' || buf[0] == 'Y';
3997 }
3998
3999 int os::stat(const char *path, struct stat *sbuf) {
4000 char pathbuf[MAX_PATH];
4001 if (strlen(path) > MAX_PATH - 1) {
4002 errno = ENAMETOOLONG;
4003 return -1;
4004 }
4005 os::native_path(strcpy(pathbuf, path));
4006 return ::stat(pathbuf, sbuf);
4007 }
4008
4009 bool os::check_heap(bool force) {
4010 return true;
4011 }
4012
4013 // int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) {
4014 // return ::vsnprintf(buf, count, format, args);
4015 // }
4016
4017 // Is a (classpath) directory empty?
4018 bool os::dir_is_empty(const char* path) {
4019 DIR *dir = NULL;
4020 struct dirent *ptr;
4021
4022 dir = opendir(path);
4023 if (dir == NULL) return true;
4024
4025 /* Scan the directory */
4026 bool result = true;
4027 char buf[sizeof(struct dirent) + MAX_PATH];
4028 while (result && (ptr = ::readdir(dir)) != NULL) {
4029 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4030 result = false;
4031 }
4032 }
4033 closedir(dir);
4034 return result;
4035 }
4036
4037 // This code originates from JDK's sysOpen and open64_w
4038 // from src/solaris/hpi/src/system_md.c
4039
4040 #ifndef O_DELETE
4041 #define O_DELETE 0x10000
4042 #endif
4043
4044 // Open a file. Unlink the file immediately after open returns
4045 // if the specified oflag has the O_DELETE flag set.
4046 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c
4047
4048 int os::open(const char *path, int oflag, int mode) {
4049
4050 if (strlen(path) > MAX_PATH - 1) {
4051 errno = ENAMETOOLONG;
4052 return -1;
4053 }
4054 int fd;
4055 int o_delete = (oflag & O_DELETE);
4056 oflag = oflag & ~O_DELETE;
4057
4058 fd = ::open64(path, oflag, mode);
4059 if (fd == -1) return -1;
4060
4061 // If the open succeeded, the file might still be a directory.
4062 {
4063 struct stat64 buf64;
4064 int ret = ::fstat64(fd, &buf64);
4065 int st_mode = buf64.st_mode;
4066
4067 if (ret != -1) {
4068 if ((st_mode & S_IFMT) == S_IFDIR) {
4069 errno = EISDIR;
4070 ::close(fd);
4071 return -1;
4072 }
4073 } else {
4074 ::close(fd);
4075 return -1;
4076 }
4077 }
4078
4079 // All file descriptors that are opened in the JVM and not
4080 // specifically destined for a subprocess should have the
4081 // close-on-exec flag set. If we don't set it, then careless 3rd
4082 // party native code might fork and exec without closing all
4083 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4084 // UNIXProcess.c), and this in turn might:
4085 //
4086 // - cause end-of-file to fail to be detected on some file
4087 // descriptors, resulting in mysterious hangs, or
4088 //
4089 // - might cause an fopen in the subprocess to fail on a system
4090 // suffering from bug 1085341.
4091 //
4092 // (Yes, the default setting of the close-on-exec flag is a Unix
4093 // design flaw.)
4094 //
4095 // See:
4096 // 1085341: 32-bit stdio routines should support file descriptors >255
4097 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4098 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4099 #ifdef FD_CLOEXEC
4100 {
4101 int flags = ::fcntl(fd, F_GETFD);
4102 if (flags != -1)
4103 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4104 }
4105 #endif
4106
4107 if (o_delete != 0) {
4108 ::unlink(path);
4109 }
4110 return fd;
4111 }
4112
4113
4114 // create binary file, rewriting existing file if required
4115 int os::create_binary_file(const char* path, bool rewrite_existing) {
4116 int oflags = O_WRONLY | O_CREAT;
4117 if (!rewrite_existing) {
4118 oflags |= O_EXCL;
4119 }
4120 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4121 }
4122
4123 // return current position of file pointer
4124 jlong os::current_file_offset(int fd) {
4125 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4126 }
4127
4128 // move file pointer to the specified offset
4129 jlong os::seek_to_file_offset(int fd, jlong offset) {
4130 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4131 }
4132
4133 // This code originates from JDK's sysAvailable
4134 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4135
4136 int os::available(int fd, jlong *bytes) {
4137 jlong cur, end;
4138 int mode;
4139 struct stat64 buf64;
4140
4141 if (::fstat64(fd, &buf64) >= 0) {
4142 mode = buf64.st_mode;
4143 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4144 // XXX: is the following call interruptible? If so, this might
4145 // need to go through the INTERRUPT_IO() wrapper as for other
4146 // blocking, interruptible calls in this file.
4147 int n;
4148 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4149 *bytes = n;
4150 return 1;
4151 }
4152 }
4153 }
4154 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4155 return 0;
4156 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4157 return 0;
4158 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4159 return 0;
4160 }
4161 *bytes = end - cur;
4162 return 1;
4163 }
4164
4165 int os::socket_available(int fd, jint *pbytes) {
4166 // Linux doc says EINTR not returned, unlike Solaris
4167 int ret = ::ioctl(fd, FIONREAD, pbytes);
4168
4169 //%% note ioctl can return 0 when successful, JVM_SocketAvailable
4170 // is expected to return 0 on failure and 1 on success to the jdk.
4171 return (ret < 0) ? 0 : 1;
4172 }
4173
4174 // Map a block of memory.
4175 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4176 char *addr, size_t bytes, bool read_only,
4177 bool allow_exec) {
4178 Unimplemented();
4179 return NULL;
4180 }
4181
4182
4183 // Remap a block of memory.
4184 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4185 char *addr, size_t bytes, bool read_only,
4186 bool allow_exec) {
4187 // same as map_memory() on this OS
4188 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4189 allow_exec);
4190 }
4191
4192 // Unmap a block of memory.
4193 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4194 return munmap(addr, bytes) == 0;
4195 }
4196
4197 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4198 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4199 // of a thread.
4200 //
4201 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4202 // the fast estimate available on the platform.
4203
4204 jlong os::current_thread_cpu_time() {
4205 // return user + sys since the cost is the same
4206 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4207 assert(n >= 0, "negative CPU time");
4208 return n;
4209 }
4210
4211 jlong os::thread_cpu_time(Thread* thread) {
4212 // consistent with what current_thread_cpu_time() returns
4213 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4214 assert(n >= 0, "negative CPU time");
4215 return n;
4216 }
4217
4218 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4219 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4220 assert(n >= 0, "negative CPU time");
4221 return n;
4222 }
4223
4224 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4225 bool error = false;
4226
4227 jlong sys_time = 0;
4228 jlong user_time = 0;
4229
4230 // reimplemented using getthrds64().
4231 //
4232 // goes like this:
4233 // For the thread in question, get the kernel thread id. Then get the
4234 // kernel thread statistics using that id.
4235 //
4236 // This only works of course when no pthread scheduling is used,
4237 // ie there is a 1:1 relationship to kernel threads.
4238 // On AIX, see AIXTHREAD_SCOPE variable.
4239
4240 pthread_t pthtid = thread->osthread()->pthread_id();
4241
4242 // retrieve kernel thread id for the pthread:
4243 tid64_t tid = 0;
4244 struct __pthrdsinfo pinfo;
4245 // I just love those otherworldly IBM APIs which force me to hand down
4246 // dummy buffers for stuff I dont care for...
4247 char dummy[1];
4248 int dummy_size = sizeof(dummy);
4249 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4250 dummy, &dummy_size) == 0) {
4251 tid = pinfo.__pi_tid;
4252 } else {
4253 tty->print_cr("pthread_getthrds_np failed.");
4254 error = true;
4255 }
4256
4257 // retrieve kernel timing info for that kernel thread
4258 if (!error) {
4259 struct thrdentry64 thrdentry;
4260 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4261 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4262 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4263 } else {
4264 tty->print_cr("pthread_getthrds_np failed.");
4265 error = true;
4266 }
4267 }
4268
4269 if (p_sys_time) {
4270 *p_sys_time = sys_time;
4271 }
4272
4273 if (p_user_time) {
4274 *p_user_time = user_time;
4275 }
4276
4277 if (error) {
4278 return false;
4279 }
4280
4281 return true;
4282 }
4283
4284 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4285 jlong sys_time;
4286 jlong user_time;
4287
4288 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4289 return -1;
4290 }
4291
4292 return user_sys_cpu_time ? sys_time + user_time : user_time;
4293 }
4294
4295 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4296 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4297 info_ptr->may_skip_backward = false; // elapsed time not wall time
4298 info_ptr->may_skip_forward = false; // elapsed time not wall time
4299 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4300 }
4301
4302 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4303 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4304 info_ptr->may_skip_backward = false; // elapsed time not wall time
4305 info_ptr->may_skip_forward = false; // elapsed time not wall time
4306 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4307 }
4308
4309 bool os::is_thread_cpu_time_supported() {
4310 return true;
4311 }
4312
4313 // System loadavg support. Returns -1 if load average cannot be obtained.
4314 // For now just return the system wide load average (no processor sets).
4315 int os::loadavg(double values[], int nelem) {
4316
4317 // Implemented using libperfstat on AIX.
4318
4319 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4320 guarantee(values, "argument error");
4321
4322 if (os::Aix::on_pase()) {
4323 Unimplemented();
4324 return -1;
4325 } else {
4326 // AIX: use libperfstat
4327 //
4328 // See also:
4329 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4330 // /usr/include/libperfstat.h:
4331
4332 // Use the already AIX version independent get_cpuinfo.
4333 os::Aix::cpuinfo_t ci;
4334 if (os::Aix::get_cpuinfo(&ci)) {
4335 for (int i = 0; i < nelem; i++) {
4336 values[i] = ci.loadavg[i];
4337 }
4338 } else {
4339 return -1;
4340 }
4341 return nelem;
4342 }
4343 }
4344
4345 void os::pause() {
4346 char filename[MAX_PATH];
4347 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4348 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4349 } else {
4350 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4351 }
4352
4353 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4354 if (fd != -1) {
4355 struct stat buf;
4356 ::close(fd);
4357 while (::stat(filename, &buf) == 0) {
4358 (void)::poll(NULL, 0, 100);
4359 }
4360 } else {
4361 jio_fprintf(stderr,
4362 "Could not open pause file '%s', continuing immediately.\n", filename);
4363 }
4364 }
4365
4366 bool os::Aix::is_primordial_thread() {
4367 if (pthread_self() == (pthread_t)1) {
4368 return true;
4369 } else {
4370 return false;
4371 }
4372 }
4373
4374 // OS recognitions (PASE/AIX, OS level) call this before calling any
4375 // one of Aix::on_pase(), Aix::os_version() static
4376 void os::Aix::initialize_os_info() {
4377
4378 assert(_on_pase == -1 && _os_version == -1, "already called.");
4379
4380 struct utsname uts;
4381 memset(&uts, 0, sizeof(uts));
4382 strcpy(uts.sysname, "?");
4383 if (::uname(&uts) == -1) {
4384 fprintf(stderr, "uname failed (%d)\n", errno);
4385 guarantee(0, "Could not determine whether we run on AIX or PASE");
4386 } else {
4387 if (Verbose) {
4388 fprintf(stderr,"uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4389 "node \"%s\" machine \"%s\"\n",
4390 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4391 }
4392 const int major = atoi(uts.version);
4393 assert(major > 0, "invalid OS version");
4394 const int minor = atoi(uts.release);
4395 assert(minor > 0, "invalid OS release");
4396 _os_version = (major << 8) | minor;
4397 if (strcmp(uts.sysname, "OS400") == 0) {
4398 Unimplemented();
4399 } else if (strcmp(uts.sysname, "AIX") == 0) {
4400 // We run on AIX. We do not support versions older than AIX 5.3.
4401 _on_pase = 0;
4402 if (_os_version < 0x0503) {
4403 fprintf(stderr, "AIX release older than AIX 5.3 not supported.\n");
4404 assert(false, "AIX release too old.");
4405 } else {
4406 if (Verbose) {
4407 fprintf(stderr, "We run on AIX %d.%d\n", major, minor);
4408 }
4409 }
4410 } else {
4411 assert(false, "unknown OS");
4412 }
4413 }
4414
4415 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4416
4417 } // end: os::Aix::initialize_os_info()
4418
4419 // Scan environment for important settings which might effect the VM.
4420 // Trace out settings. Warn about invalid settings and/or correct them.
4421 //
4422 // Must run after os::Aix::initialue_os_info().
4423 void os::Aix::scan_environment() {
4424
4425 char* p;
4426 int rc;
4427
4428 // Warn explicity if EXTSHM=ON is used. That switch changes how
4429 // System V shared memory behaves. One effect is that page size of
4430 // shared memory cannot be change dynamically, effectivly preventing
4431 // large pages from working.
4432 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4433 // recommendation is (in OSS notes) to switch it off.
4434 p = ::getenv("EXTSHM");
4435 if (Verbose) {
4436 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4437 }
4438 if (p && strcmp(p, "ON") == 0) {
4439 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4440 _extshm = 1;
4441 } else {
4442 _extshm = 0;
4443 }
4444
4445 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4446 // Not tested, not supported.
4447 //
4448 // Note that it might be worth the trouble to test and to require it, if only to
4449 // get useful return codes for mprotect.
4450 //
4451 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4452 // exec() ? before loading the libjvm ? ....)
4453 p = ::getenv("XPG_SUS_ENV");
4454 if (Verbose) {
4455 fprintf(stderr, "XPG_SUS_ENV=%s.\n", p ? p : "<unset>");
4456 }
4457 if (p && strcmp(p, "ON") == 0) {
4458 _xpg_sus_mode = 1;
4459 fprintf(stderr, "Unsupported setting: XPG_SUS_ENV=ON\n");
4460 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4461 // clobber address ranges. If we ever want to support that, we have to do some
4462 // testing first.
4463 guarantee(false, "XPG_SUS_ENV=ON not supported");
4464 } else {
4465 _xpg_sus_mode = 0;
4466 }
4467
4468 // Switch off AIX internal (pthread) guard pages. This has
4469 // immediate effect for any pthread_create calls which follow.
4470 p = ::getenv("AIXTHREAD_GUARDPAGES");
4471 if (Verbose) {
4472 fprintf(stderr, "AIXTHREAD_GUARDPAGES=%s.\n", p ? p : "<unset>");
4473 fprintf(stderr, "setting AIXTHREAD_GUARDPAGES=0.\n");
4474 }
4475 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4476 guarantee(rc == 0, "");
4477
4478 } // end: os::Aix::scan_environment()
4479
4480 // PASE: initialize the libo4 library (AS400 PASE porting library).
4481 void os::Aix::initialize_libo4() {
4482 Unimplemented();
4483 }
4484
4485 // AIX: initialize the libperfstat library (we load this dynamically
4486 // because it is only available on AIX.
4487 void os::Aix::initialize_libperfstat() {
4488
4489 assert(os::Aix::on_aix(), "AIX only");
4490
4491 if (!libperfstat::init()) {
4492 fprintf(stderr, "libperfstat initialization failed.\n");
4493 assert(false, "libperfstat initialization failed");
4494 } else {
4495 if (Verbose) {
4496 fprintf(stderr, "libperfstat initialized.\n");
4497 }
4498 }
4499 } // end: os::Aix::initialize_libperfstat
4500
4501 /////////////////////////////////////////////////////////////////////////////
4502 // thread stack
4503
4504 // function to query the current stack size using pthread_getthrds_np
4505 //
4506 // ! do not change anything here unless you know what you are doing !
4507 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4508
4509 // This only works when invoked on a pthread. As we agreed not to use
4510 // primordial threads anyway, I assert here
4511 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4512
4513 // information about this api can be found (a) in the pthread.h header and
4514 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4515 //
4516 // The use of this API to find out the current stack is kind of undefined.
4517 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4518 // enough for cases where I let the pthread library create its stacks. For cases
4519 // where I create an own stack and pass this to pthread_create, it seems not to
4520 // work (the returned stack size in that case is 0).
4521
4522 pthread_t tid = pthread_self();
4523 struct __pthrdsinfo pinfo;
4524 char dummy[1]; // we only need this to satisfy the api and to not get E
4525 int dummy_size = sizeof(dummy);
4526
4527 memset(&pinfo, 0, sizeof(pinfo));
4528
4529 const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4530 sizeof(pinfo), dummy, &dummy_size);
4531
4532 if (rc != 0) {
4533 fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc);
4534 guarantee(0, "pthread_getthrds_np failed");
4535 }
4536
4537 guarantee(pinfo.__pi_stackend, "returned stack base invalid");
4538
4539 // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack
4540 // (when handing down a stack to pthread create, see pthread_attr_setstackaddr).
4541 // Not sure what to do here - I feel inclined to forbid this use case completely.
4542 guarantee(pinfo.__pi_stacksize, "returned stack size invalid");
4543
4544 // On AIX, stacks are not necessarily page aligned so round the base and size accordingly
4545 if (p_stack_base) {
4546 (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size());
4547 }
4548
4549 if (p_stack_size) {
4550 (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size();
4551 }
4552
4553 #ifndef PRODUCT
4554 if (Verbose) {
4555 fprintf(stderr,
4556 "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT
4557 ", real stack_size=" INTPTR_FORMAT
4558 ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n",
4559 (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize,
4560 (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()),
4561 pinfo.__pi_stacksize - os::Aix::stack_page_size());
4562 }
4563 #endif
4564
4565 } // end query_stack_dimensions
4566
4567 // get the current stack base from the OS (actually, the pthread library)
4568 address os::current_stack_base() {
4569 address p;
4570 query_stack_dimensions(&p, 0);
4571 return p;
4572 }
4573
4574 // get the current stack size from the OS (actually, the pthread library)
4575 size_t os::current_stack_size() {
4576 size_t s;
4577 query_stack_dimensions(0, &s);
4578 return s;
4579 }
4580
4581 // Refer to the comments in os_solaris.cpp park-unpark.
4582 //
4583 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4584 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4585 // For specifics regarding the bug see GLIBC BUGID 261237 :
4586 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4587 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4588 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4589 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4590 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4591 // and monitorenter when we're using 1-0 locking. All those operations may result in
4592 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4593 // of libpthread avoids the problem, but isn't practical.
4594 //
4595 // Possible remedies:
4596 //
4597 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4598 // This is palliative and probabilistic, however. If the thread is preempted
4599 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4600 // than the minimum period may have passed, and the abstime may be stale (in the
4601 // past) resultin in a hang. Using this technique reduces the odds of a hang
4602 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4603 //
4604 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4605 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4606 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4607 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4608 // thread.
4609 //
4610 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4611 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4612 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4613 // This also works well. In fact it avoids kernel-level scalability impediments
4614 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4615 // timers in a graceful fashion.
4616 //
4617 // 4. When the abstime value is in the past it appears that control returns
4618 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4619 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4620 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4621 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4622 // It may be possible to avoid reinitialization by checking the return
4623 // value from pthread_cond_timedwait(). In addition to reinitializing the
4624 // condvar we must establish the invariant that cond_signal() is only called
4625 // within critical sections protected by the adjunct mutex. This prevents
4626 // cond_signal() from "seeing" a condvar that's in the midst of being
4627 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4628 // desirable signal-after-unlock optimization that avoids futile context switching.
4629 //
4630 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4631 // structure when a condvar is used or initialized. cond_destroy() would
4632 // release the helper structure. Our reinitialize-after-timedwait fix
4633 // put excessive stress on malloc/free and locks protecting the c-heap.
4634 //
4635 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4636 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4637 // and only enabling the work-around for vulnerable environments.
4638
4639 // utility to compute the abstime argument to timedwait:
4640 // millis is the relative timeout time
4641 // abstime will be the absolute timeout time
4642 // TODO: replace compute_abstime() with unpackTime()
4643
4644 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4645 if (millis < 0) millis = 0;
4646 struct timeval now;
4647 int status = gettimeofday(&now, NULL);
4648 assert(status == 0, "gettimeofday");
4649 jlong seconds = millis / 1000;
4650 millis %= 1000;
4651 if (seconds > 50000000) { // see man cond_timedwait(3T)
4652 seconds = 50000000;
4653 }
4654 abstime->tv_sec = now.tv_sec + seconds;
4655 long usec = now.tv_usec + millis * 1000;
4656 if (usec >= 1000000) {
4657 abstime->tv_sec += 1;
4658 usec -= 1000000;
4659 }
4660 abstime->tv_nsec = usec * 1000;
4661 return abstime;
4662 }
4663
4664
4665 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4666 // Conceptually TryPark() should be equivalent to park(0).
4667
4668 int os::PlatformEvent::TryPark() {
4669 for (;;) {
4670 const int v = _Event;
4671 guarantee ((v == 0) || (v == 1), "invariant");
4672 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4673 }
4674 }
4675
4676 void os::PlatformEvent::park() { // AKA "down()"
4677 // Invariant: Only the thread associated with the Event/PlatformEvent
4678 // may call park().
4679 // TODO: assert that _Assoc != NULL or _Assoc == Self
4680 int v;
4681 for (;;) {
4682 v = _Event;
4683 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4684 }
4685 guarantee (v >= 0, "invariant");
4686 if (v == 0) {
4687 // Do this the hard way by blocking ...
4688 int status = pthread_mutex_lock(_mutex);
4689 assert_status(status == 0, status, "mutex_lock");
4690 guarantee (_nParked == 0, "invariant");
4691 ++ _nParked;
4692 while (_Event < 0) {
4693 status = pthread_cond_wait(_cond, _mutex);
4694 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4695 }
4696 -- _nParked;
4697
4698 // In theory we could move the ST of 0 into _Event past the unlock(),
4699 // but then we'd need a MEMBAR after the ST.
4700 _Event = 0;
4701 status = pthread_mutex_unlock(_mutex);
4702 assert_status(status == 0, status, "mutex_unlock");
4703 }
4704 guarantee (_Event >= 0, "invariant");
4705 }
4706
4707 int os::PlatformEvent::park(jlong millis) {
4708 guarantee (_nParked == 0, "invariant");
4709
4710 int v;
4711 for (;;) {
4712 v = _Event;
4713 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4714 }
4715 guarantee (v >= 0, "invariant");
4716 if (v != 0) return OS_OK;
4717
4718 // We do this the hard way, by blocking the thread.
4719 // Consider enforcing a minimum timeout value.
4720 struct timespec abst;
4721 compute_abstime(&abst, millis);
4722
4723 int ret = OS_TIMEOUT;
4724 int status = pthread_mutex_lock(_mutex);
4725 assert_status(status == 0, status, "mutex_lock");
4726 guarantee (_nParked == 0, "invariant");
4727 ++_nParked;
4728
4729 // Object.wait(timo) will return because of
4730 // (a) notification
4731 // (b) timeout
4732 // (c) thread.interrupt
4733 //
4734 // Thread.interrupt and object.notify{All} both call Event::set.
4735 // That is, we treat thread.interrupt as a special case of notification.
4736 // The underlying Solaris implementation, cond_timedwait, admits
4737 // spurious/premature wakeups, but the JLS/JVM spec prevents the
4738 // JVM from making those visible to Java code. As such, we must
4739 // filter out spurious wakeups. We assume all ETIME returns are valid.
4740 //
4741 // TODO: properly differentiate simultaneous notify+interrupt.
4742 // In that case, we should propagate the notify to another waiter.
4743
4744 while (_Event < 0) {
4745 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4746 assert_status(status == 0 || status == ETIMEDOUT,
4747 status, "cond_timedwait");
4748 if (!FilterSpuriousWakeups) break; // previous semantics
4749 if (status == ETIMEDOUT) break;
4750 // We consume and ignore EINTR and spurious wakeups.
4751 }
4752 --_nParked;
4753 if (_Event >= 0) {
4754 ret = OS_OK;
4755 }
4756 _Event = 0;
4757 status = pthread_mutex_unlock(_mutex);
4758 assert_status(status == 0, status, "mutex_unlock");
4759 assert (_nParked == 0, "invariant");
4760 return ret;
4761 }
4762
4763 void os::PlatformEvent::unpark() {
4764 int v, AnyWaiters;
4765 for (;;) {
4766 v = _Event;
4767 if (v > 0) {
4768 // The LD of _Event could have reordered or be satisfied
4769 // by a read-aside from this processor's write buffer.
4770 // To avoid problems execute a barrier and then
4771 // ratify the value.
4772 OrderAccess::fence();
4773 if (_Event == v) return;
4774 continue;
4775 }
4776 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4777 }
4778 if (v < 0) {
4779 // Wait for the thread associated with the event to vacate
4780 int status = pthread_mutex_lock(_mutex);
4781 assert_status(status == 0, status, "mutex_lock");
4782 AnyWaiters = _nParked;
4783
4784 if (AnyWaiters != 0) {
4785 // We intentional signal *after* dropping the lock
4786 // to avoid a common class of futile wakeups.
4787 status = pthread_cond_signal(_cond);
4788 assert_status(status == 0, status, "cond_signal");
4789 }
4790 // Mutex should be locked for pthread_cond_signal(_cond).
4791 status = pthread_mutex_unlock(_mutex);
4792 assert_status(status == 0, status, "mutex_unlock");
4793 }
4794
4795 // Note that we signal() _after dropping the lock for "immortal" Events.
4796 // This is safe and avoids a common class of futile wakeups. In rare
4797 // circumstances this can cause a thread to return prematurely from
4798 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4799 // simply re-test the condition and re-park itself.
4800 }
4801
4802
4803 // JSR166
4804 // -------------------------------------------------------
4805
4806 //
4807 // The solaris and linux implementations of park/unpark are fairly
4808 // conservative for now, but can be improved. They currently use a
4809 // mutex/condvar pair, plus a a count.
4810 // Park decrements count if > 0, else does a condvar wait. Unpark
4811 // sets count to 1 and signals condvar. Only one thread ever waits
4812 // on the condvar. Contention seen when trying to park implies that someone
4813 // is unparking you, so don't wait. And spurious returns are fine, so there
4814 // is no need to track notifications.
4815 //
4816
4817 #define MAX_SECS 100000000
4818 //
4819 // This code is common to linux and solaris and will be moved to a
4820 // common place in dolphin.
4821 //
4822 // The passed in time value is either a relative time in nanoseconds
4823 // or an absolute time in milliseconds. Either way it has to be unpacked
4824 // into suitable seconds and nanoseconds components and stored in the
4825 // given timespec structure.
4826 // Given time is a 64-bit value and the time_t used in the timespec is only
4827 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4828 // overflow if times way in the future are given. Further on Solaris versions
4829 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4830 // number of seconds, in abstime, is less than current_time + 100,000,000.
4831 // As it will be 28 years before "now + 100000000" will overflow we can
4832 // ignore overflow and just impose a hard-limit on seconds using the value
4833 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4834 // years from "now".
4835 //
4836
4837 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4838 assert (time > 0, "convertTime");
4839
4840 struct timeval now;
4841 int status = gettimeofday(&now, NULL);
4842 assert(status == 0, "gettimeofday");
4843
4844 time_t max_secs = now.tv_sec + MAX_SECS;
4845
4846 if (isAbsolute) {
4847 jlong secs = time / 1000;
4848 if (secs > max_secs) {
4849 absTime->tv_sec = max_secs;
4850 }
4851 else {
4852 absTime->tv_sec = secs;
4853 }
4854 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4855 }
4856 else {
4857 jlong secs = time / NANOSECS_PER_SEC;
4858 if (secs >= MAX_SECS) {
4859 absTime->tv_sec = max_secs;
4860 absTime->tv_nsec = 0;
4861 }
4862 else {
4863 absTime->tv_sec = now.tv_sec + secs;
4864 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4865 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4866 absTime->tv_nsec -= NANOSECS_PER_SEC;
4867 ++absTime->tv_sec; // note: this must be <= max_secs
4868 }
4869 }
4870 }
4871 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4872 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4873 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4874 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4875 }
4876
4877 void Parker::park(bool isAbsolute, jlong time) {
4878 // Optional fast-path check:
4879 // Return immediately if a permit is available.
4880 if (_counter > 0) {
4881 _counter = 0;
4882 OrderAccess::fence();
4883 return;
4884 }
4885
4886 Thread* thread = Thread::current();
4887 assert(thread->is_Java_thread(), "Must be JavaThread");
4888 JavaThread *jt = (JavaThread *)thread;
4889
4890 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4891 // Check interrupt before trying to wait
4892 if (Thread::is_interrupted(thread, false)) {
4893 return;
4894 }
4895
4896 // Next, demultiplex/decode time arguments
4897 timespec absTime;
4898 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4899 return;
4900 }
4901 if (time > 0) {
4902 unpackTime(&absTime, isAbsolute, time);
4903 }
4904
4905
4906 // Enter safepoint region
4907 // Beware of deadlocks such as 6317397.
4908 // The per-thread Parker:: mutex is a classic leaf-lock.
4909 // In particular a thread must never block on the Threads_lock while
4910 // holding the Parker:: mutex. If safepoints are pending both the
4911 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4912 ThreadBlockInVM tbivm(jt);
4913
4914 // Don't wait if cannot get lock since interference arises from
4915 // unblocking. Also. check interrupt before trying wait
4916 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4917 return;
4918 }
4919
4920 int status;
4921 if (_counter > 0) { // no wait needed
4922 _counter = 0;
4923 status = pthread_mutex_unlock(_mutex);
4924 assert (status == 0, "invariant");
4925 OrderAccess::fence();
4926 return;
4927 }
4928
4929 #ifdef ASSERT
4930 // Don't catch signals while blocked; let the running threads have the signals.
4931 // (This allows a debugger to break into the running thread.)
4932 sigset_t oldsigs;
4933 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4934 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4935 #endif
4936
4937 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4938 jt->set_suspend_equivalent();
4939 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4940
4941 if (time == 0) {
4942 status = pthread_cond_wait (_cond, _mutex);
4943 } else {
4944 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4945 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4946 pthread_cond_destroy (_cond);
4947 pthread_cond_init (_cond, NULL);
4948 }
4949 }
4950 assert_status(status == 0 || status == EINTR ||
4951 status == ETIME || status == ETIMEDOUT,
4952 status, "cond_timedwait");
4953
4954 #ifdef ASSERT
4955 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4956 #endif
4957
4958 _counter = 0;
4959 status = pthread_mutex_unlock(_mutex);
4960 assert_status(status == 0, status, "invariant");
4961 // If externally suspended while waiting, re-suspend
4962 if (jt->handle_special_suspend_equivalent_condition()) {
4963 jt->java_suspend_self();
4964 }
4965
4966 OrderAccess::fence();
4967 }
4968
4969 void Parker::unpark() {
4970 int s, status;
4971 status = pthread_mutex_lock(_mutex);
4972 assert (status == 0, "invariant");
4973 s = _counter;
4974 _counter = 1;
4975 if (s < 1) {
4976 if (WorkAroundNPTLTimedWaitHang) {
4977 status = pthread_cond_signal (_cond);
4978 assert (status == 0, "invariant");
4979 status = pthread_mutex_unlock(_mutex);
4980 assert (status == 0, "invariant");
4981 } else {
4982 status = pthread_mutex_unlock(_mutex);
4983 assert (status == 0, "invariant");
4984 status = pthread_cond_signal (_cond);
4985 assert (status == 0, "invariant");
4986 }
4987 } else {
4988 pthread_mutex_unlock(_mutex);
4989 assert (status == 0, "invariant");
4990 }
4991 }
4992
4993
4994 extern char** environ;
4995
4996 // Run the specified command in a separate process. Return its exit value,
4997 // or -1 on failure (e.g. can't fork a new process).
4998 // Unlike system(), this function can be called from signal handler. It
4999 // doesn't block SIGINT et al.
5000 int os::fork_and_exec(char* cmd) {
5001 char * argv[4] = {"sh", "-c", cmd, NULL};
5002
5003 pid_t pid = fork();
5004
5005 if (pid < 0) {
5006 // fork failed
5007 return -1;
5008
5009 } else if (pid == 0) {
5010 // child process
5011
5012 // try to be consistent with system(), which uses "/usr/bin/sh" on AIX
5013 execve("/usr/bin/sh", argv, environ);
5014
5015 // execve failed
5016 _exit(-1);
5017
5018 } else {
5019 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
5020 // care about the actual exit code, for now.
5021
5022 int status;
5023
5024 // Wait for the child process to exit. This returns immediately if
5025 // the child has already exited. */
5026 while (waitpid(pid, &status, 0) < 0) {
5027 switch (errno) {
5028 case ECHILD: return 0;
5029 case EINTR: break;
5030 default: return -1;
5031 }
5032 }
5033
5034 if (WIFEXITED(status)) {
5035 // The child exited normally; get its exit code.
5036 return WEXITSTATUS(status);
5037 } else if (WIFSIGNALED(status)) {
5038 // The child exited because of a signal
5039 // The best value to return is 0x80 + signal number,
5040 // because that is what all Unix shells do, and because
5041 // it allows callers to distinguish between process exit and
5042 // process death by signal.
5043 return 0x80 + WTERMSIG(status);
5044 } else {
5045 // Unknown exit code; pass it through
5046 return status;
5047 }
5048 }
5049 // Remove warning.
5050 return -1;
5051 }
5052
5053 // is_headless_jre()
5054 //
5055 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5056 // in order to report if we are running in a headless jre.
5057 //
5058 // Since JDK8 xawt/libmawt.so is moved into the same directory
5059 // as libawt.so, and renamed libawt_xawt.so
5060 bool os::is_headless_jre() {
5061 struct stat statbuf;
5062 char buf[MAXPATHLEN];
5063 char libmawtpath[MAXPATHLEN];
5064 const char *xawtstr = "/xawt/libmawt.so";
5065 const char *new_xawtstr = "/libawt_xawt.so";
5066
5067 char *p;
5068
5069 // Get path to libjvm.so
5070 os::jvm_path(buf, sizeof(buf));
5071
5072 // Get rid of libjvm.so
5073 p = strrchr(buf, '/');
5074 if (p == NULL) return false;
5075 else *p = '\0';
5076
5077 // Get rid of client or server
5078 p = strrchr(buf, '/');
5079 if (p == NULL) return false;
5080 else *p = '\0';
5081
5082 // check xawt/libmawt.so
5083 strcpy(libmawtpath, buf);
5084 strcat(libmawtpath, xawtstr);
5085 if (::stat(libmawtpath, &statbuf) == 0) return false;
5086
5087 // check libawt_xawt.so
5088 strcpy(libmawtpath, buf);
5089 strcat(libmawtpath, new_xawtstr);
5090 if (::stat(libmawtpath, &statbuf) == 0) return false;
5091
5092 return true;
5093 }
5094
5095 // Get the default path to the core file
5096 // Returns the length of the string
5097 int os::get_core_path(char* buffer, size_t bufferSize) {
5098 const char* p = get_current_directory(buffer, bufferSize);
5099
5100 if (p == NULL) {
5101 assert(p != NULL, "failed to get current directory");
5102 return 0;
5103 }
5104
5105 return strlen(buffer);
5106 }
5107
5108 #ifndef PRODUCT
5109 void TestReserveMemorySpecial_test() {
5110 // No tests available for this platform
5111 }
5112 #endif