1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2014 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_aix.h"
39 #include "libperfstat_aix.hpp"
40 #include "loadlib_aix.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/filemap.hpp"
43 #include "mutex_aix.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "os_aix.inline.hpp"
46 #include "os_share_aix.hpp"
47 #include "porting_aix.hpp"
48 #include "prims/jniFastGetField.hpp"
49 #include "prims/jvm.h"
50 #include "prims/jvm_misc.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/atomic.inline.hpp"
53 #include "runtime/extendedPC.hpp"
54 #include "runtime/globals.hpp"
55 #include "runtime/interfaceSupport.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/mutexLocker.hpp"
59 #include "runtime/objectMonitor.hpp"
60 #include "runtime/orderAccess.inline.hpp"
61 #include "runtime/os.hpp"
62 #include "runtime/osThread.hpp"
63 #include "runtime/perfMemory.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/statSampler.hpp"
66 #include "runtime/stubRoutines.hpp"
67 #include "runtime/thread.inline.hpp"
68 #include "runtime/threadCritical.hpp"
69 #include "runtime/timer.hpp"
70 #include "runtime/vm_version.hpp"
71 #include "services/attachListener.hpp"
72 #include "services/runtimeService.hpp"
73 #include "utilities/decoder.hpp"
74 #include "utilities/defaultStream.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/vmError.hpp"
78
79 // put OS-includes here (sorted alphabetically)
80 #include <errno.h>
81 #include <fcntl.h>
82 #include <inttypes.h>
83 #include <poll.h>
84 #include <procinfo.h>
85 #include <pthread.h>
86 #include <pwd.h>
87 #include <semaphore.h>
88 #include <signal.h>
89 #include <stdint.h>
90 #include <stdio.h>
91 #include <string.h>
92 #include <unistd.h>
93 #include <sys/ioctl.h>
94 #include <sys/ipc.h>
95 #include <sys/mman.h>
96 #include <sys/resource.h>
97 #include <sys/select.h>
98 #include <sys/shm.h>
99 #include <sys/socket.h>
100 #include <sys/stat.h>
101 #include <sys/sysinfo.h>
102 #include <sys/systemcfg.h>
103 #include <sys/time.h>
104 #include <sys/times.h>
105 #include <sys/types.h>
106 #include <sys/utsname.h>
107 #include <sys/vminfo.h>
108 #include <sys/wait.h>
109
110 // If RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling
111 // getrusage() is prepared to handle the associated failure.
112 #ifndef RUSAGE_THREAD
113 #define RUSAGE_THREAD (1) /* only the calling thread */
114 #endif
115
116 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
117 #if !defined(_AIXVERSION_610)
118 extern "C" {
119 int getthrds64(pid_t ProcessIdentifier,
120 struct thrdentry64* ThreadBuffer,
121 int ThreadSize,
122 tid64_t* IndexPointer,
123 int Count);
124 }
125 #endif
126
127 // Excerpts from systemcfg.h definitions newer than AIX 5.3
128 #ifndef PV_7
129 # define PV_7 0x200000 // Power PC 7
130 # define PV_7_Compat 0x208000 // Power PC 7
131 #endif
132
133 #define MAX_PATH (2 * K)
134
135 // for timer info max values which include all bits
136 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
137 // for multipage initialization error analysis (in 'g_multipage_error')
138 #define ERROR_MP_OS_TOO_OLD 100
139 #define ERROR_MP_EXTSHM_ACTIVE 101
140 #define ERROR_MP_VMGETINFO_FAILED 102
141 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
142
143 // the semantics in this file are thus that codeptr_t is a *real code ptr*
144 // This means that any function taking codeptr_t as arguments will assume
145 // a real codeptr and won't handle function descriptors (eg getFuncName),
146 // whereas functions taking address as args will deal with function
147 // descriptors (eg os::dll_address_to_library_name)
148 typedef unsigned int* codeptr_t;
149
150 // typedefs for stackslots, stack pointers, pointers to op codes
151 typedef unsigned long stackslot_t;
152 typedef stackslot_t* stackptr_t;
153
154 // query dimensions of the stack of the calling thread
155 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
156
157 // function to check a given stack pointer against given stack limits
158 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
159 if (((uintptr_t)sp) & 0x7) {
160 return false;
161 }
162 if (sp > stack_base) {
163 return false;
164 }
165 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
166 return false;
167 }
168 return true;
169 }
170
171 // returns true if function is a valid codepointer
172 inline bool is_valid_codepointer(codeptr_t p) {
173 if (!p) {
174 return false;
175 }
176 if (((uintptr_t)p) & 0x3) {
177 return false;
178 }
179 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
180 return false;
181 }
182 return true;
183 }
184
185 // macro to check a given stack pointer against given stack limits and to die if test fails
186 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
187 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
188 }
189
190 // macro to check the current stack pointer against given stacklimits
191 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
192 address sp; \
193 sp = os::current_stack_pointer(); \
194 CHECK_STACK_PTR(sp, stack_base, stack_size); \
195 }
196
197 ////////////////////////////////////////////////////////////////////////////////
198 // global variables (for a description see os_aix.hpp)
199
200 julong os::Aix::_physical_memory = 0;
201 pthread_t os::Aix::_main_thread = ((pthread_t)0);
202 int os::Aix::_page_size = -1;
203 int os::Aix::_on_pase = -1;
204 int os::Aix::_os_version = -1;
205 int os::Aix::_stack_page_size = -1;
206 size_t os::Aix::_shm_default_page_size = -1;
207 int os::Aix::_can_use_64K_pages = -1;
208 int os::Aix::_can_use_16M_pages = -1;
209 int os::Aix::_xpg_sus_mode = -1;
210 int os::Aix::_extshm = -1;
211 int os::Aix::_logical_cpus = -1;
212
213 ////////////////////////////////////////////////////////////////////////////////
214 // local variables
215
216 static int g_multipage_error = -1; // error analysis for multipage initialization
217 static jlong initial_time_count = 0;
218 static int clock_tics_per_sec = 100;
219 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
220 static bool check_signals = true;
221 static pid_t _initial_pid = 0;
222 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
223 static sigset_t SR_sigset;
224 static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls */
225
226 julong os::available_memory() {
227 return Aix::available_memory();
228 }
229
230 julong os::Aix::available_memory() {
231 os::Aix::meminfo_t mi;
232 if (os::Aix::get_meminfo(&mi)) {
233 return mi.real_free;
234 } else {
235 return 0xFFFFFFFFFFFFFFFFLL;
236 }
237 }
238
239 julong os::physical_memory() {
240 return Aix::physical_memory();
241 }
242
243 ////////////////////////////////////////////////////////////////////////////////
244 // environment support
245
246 bool os::getenv(const char* name, char* buf, int len) {
247 const char* val = ::getenv(name);
248 if (val != NULL && strlen(val) < (size_t)len) {
249 strcpy(buf, val);
250 return true;
251 }
252 if (len > 0) buf[0] = 0; // return a null string
253 return false;
254 }
255
256
257 // Return true if user is running as root.
258
259 bool os::have_special_privileges() {
260 static bool init = false;
261 static bool privileges = false;
262 if (!init) {
263 privileges = (getuid() != geteuid()) || (getgid() != getegid());
264 init = true;
265 }
266 return privileges;
267 }
268
269 // Helper function, emulates disclaim64 using multiple 32bit disclaims
270 // because we cannot use disclaim64() on AS/400 and old AIX releases.
271 static bool my_disclaim64(char* addr, size_t size) {
272
273 if (size == 0) {
274 return true;
275 }
276
277 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
278 const unsigned int maxDisclaimSize = 0x80000000;
279
280 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
281 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
282
283 char* p = addr;
284
285 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
286 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
287 //if (Verbose)
288 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
289 return false;
290 }
291 p += maxDisclaimSize;
292 }
293
294 if (lastDisclaimSize > 0) {
295 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
296 //if (Verbose)
297 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
298 return false;
299 }
300 }
301
302 return true;
303 }
304
305 // Cpu architecture string
306 #if defined(PPC32)
307 static char cpu_arch[] = "ppc";
308 #elif defined(PPC64)
309 static char cpu_arch[] = "ppc64";
310 #else
311 #error Add appropriate cpu_arch setting
312 #endif
313
314
315 // Given an address, returns the size of the page backing that address.
316 size_t os::Aix::query_pagesize(void* addr) {
317
318 vm_page_info pi;
319 pi.addr = (uint64_t)addr;
320 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
321 return pi.pagesize;
322 } else {
323 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
324 assert(false, "vmgetinfo failed to retrieve page size");
325 return SIZE_4K;
326 }
327
328 }
329
330 // Returns the kernel thread id of the currently running thread.
331 pid_t os::Aix::gettid() {
332 return (pid_t) thread_self();
333 }
334
335 void os::Aix::initialize_system_info() {
336
337 // get the number of online(logical) cpus instead of configured
338 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
339 assert(_processor_count > 0, "_processor_count must be > 0");
340
341 // retrieve total physical storage
342 os::Aix::meminfo_t mi;
343 if (!os::Aix::get_meminfo(&mi)) {
344 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
345 assert(false, "os::Aix::get_meminfo failed.");
346 }
347 _physical_memory = (julong) mi.real_total;
348 }
349
350 // Helper function for tracing page sizes.
351 static const char* describe_pagesize(size_t pagesize) {
352 switch (pagesize) {
353 case SIZE_4K : return "4K";
354 case SIZE_64K: return "64K";
355 case SIZE_16M: return "16M";
356 case SIZE_16G: return "16G";
357 default:
358 assert(false, "surprise");
359 return "??";
360 }
361 }
362
363 // Retrieve information about multipage size support. Will initialize
364 // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages,
365 // Aix::_can_use_16M_pages.
366 // Must be called before calling os::large_page_init().
367 void os::Aix::query_multipage_support() {
368
369 guarantee(_page_size == -1 &&
370 _stack_page_size == -1 &&
371 _can_use_64K_pages == -1 &&
372 _can_use_16M_pages == -1 &&
373 g_multipage_error == -1,
374 "do not call twice");
375
376 _page_size = ::sysconf(_SC_PAGESIZE);
377
378 // This really would surprise me.
379 assert(_page_size == SIZE_4K, "surprise!");
380
381
382 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
383 // Default data page size is influenced either by linker options (-bdatapsize)
384 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
385 // default should be 4K.
386 size_t data_page_size = SIZE_4K;
387 {
388 void* p = os::malloc(SIZE_16M, mtInternal);
389 guarantee(p != NULL, "malloc failed");
390 data_page_size = os::Aix::query_pagesize(p);
391 os::free(p);
392 }
393
394 // query default shm page size (LDR_CNTRL SHMPSIZE)
395 {
396 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
397 guarantee(shmid != -1, "shmget failed");
398 void* p = ::shmat(shmid, NULL, 0);
399 ::shmctl(shmid, IPC_RMID, NULL);
400 guarantee(p != (void*) -1, "shmat failed");
401 _shm_default_page_size = os::Aix::query_pagesize(p);
402 ::shmdt(p);
403 }
404
405 // before querying the stack page size, make sure we are not running as primordial
406 // thread (because primordial thread's stack may have different page size than
407 // pthread thread stacks). Running a VM on the primordial thread won't work for a
408 // number of reasons so we may just as well guarantee it here
409 guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread");
410
411 // query stack page size
412 {
413 int dummy = 0;
414 _stack_page_size = os::Aix::query_pagesize(&dummy);
415 // everything else would surprise me and should be looked into
416 guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size");
417 // also, just for completeness: pthread stacks are allocated from C heap, so
418 // stack page size should be the same as data page size
419 guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size");
420 }
421
422 // EXTSHM is bad: among other things, it prevents setting pagesize dynamically
423 // for system V shm.
424 if (Aix::extshm()) {
425 if (Verbose) {
426 fprintf(stderr, "EXTSHM is active - will disable large page support.\n"
427 "Please make sure EXTSHM is OFF for large page support.\n");
428 }
429 g_multipage_error = ERROR_MP_EXTSHM_ACTIVE;
430 _can_use_64K_pages = _can_use_16M_pages = 0;
431 goto query_multipage_support_end;
432 }
433
434 // now check which page sizes the OS claims it supports, and of those, which actually can be used.
435 {
436 const int MAX_PAGE_SIZES = 4;
437 psize_t sizes[MAX_PAGE_SIZES];
438 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
439 if (num_psizes == -1) {
440 if (Verbose) {
441 fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
442 fprintf(stderr, "disabling multipage support.\n");
443 }
444 g_multipage_error = ERROR_MP_VMGETINFO_FAILED;
445 _can_use_64K_pages = _can_use_16M_pages = 0;
446 goto query_multipage_support_end;
447 }
448 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
449 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
450 if (Verbose) {
451 fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
452 for (int i = 0; i < num_psizes; i ++) {
453 fprintf(stderr, " %s ", describe_pagesize(sizes[i]));
454 }
455 fprintf(stderr, " .\n");
456 }
457
458 // Can we use 64K, 16M pages?
459 _can_use_64K_pages = 0;
460 _can_use_16M_pages = 0;
461 for (int i = 0; i < num_psizes; i ++) {
462 if (sizes[i] == SIZE_64K) {
463 _can_use_64K_pages = 1;
464 } else if (sizes[i] == SIZE_16M) {
465 _can_use_16M_pages = 1;
466 }
467 }
468
469 if (!_can_use_64K_pages) {
470 g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K;
471 }
472
473 // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages,
474 // there must be an actual 16M page pool, and we must run with enough rights.
475 if (_can_use_16M_pages) {
476 const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR);
477 guarantee(shmid != -1, "shmget failed");
478 struct shmid_ds shm_buf = { 0 };
479 shm_buf.shm_pagesize = SIZE_16M;
480 const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false;
481 const int en = errno;
482 ::shmctl(shmid, IPC_RMID, NULL);
483 if (!can_set_pagesize) {
484 if (Verbose) {
485 fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n"
486 "Will deactivate 16M support.\n", en, strerror(en));
487 }
488 _can_use_16M_pages = 0;
489 }
490 }
491
492 } // end: check which pages can be used for shared memory
493
494 query_multipage_support_end:
495
496 guarantee(_page_size != -1 &&
497 _stack_page_size != -1 &&
498 _can_use_64K_pages != -1 &&
499 _can_use_16M_pages != -1, "Page sizes not properly initialized");
500
501 if (_can_use_64K_pages) {
502 g_multipage_error = 0;
503 }
504
505 if (Verbose) {
506 fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size));
507 fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size));
508 fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size));
509 fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no"));
510 fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no"));
511 fprintf(stderr, "Multipage error details: %d\n", g_multipage_error);
512 }
513
514 } // end os::Aix::query_multipage_support()
515
516 // The code for this method was initially derived from the version in os_linux.cpp.
517 void os::init_system_properties_values() {
518
519 #define DEFAULT_LIBPATH "/usr/lib:/lib"
520 #define EXTENSIONS_DIR "/lib/ext"
521
522 // Buffer that fits several sprintfs.
523 // Note that the space for the trailing null is provided
524 // by the nulls included by the sizeof operator.
525 const size_t bufsize =
526 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
527 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
528 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
529
530 // sysclasspath, java_home, dll_dir
531 {
532 char *pslash;
533 os::jvm_path(buf, bufsize);
534
535 // Found the full path to libjvm.so.
536 // Now cut the path to <java_home>/jre if we can.
537 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
538 pslash = strrchr(buf, '/');
539 if (pslash != NULL) {
540 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
541 }
542 Arguments::set_dll_dir(buf);
543
544 if (pslash != NULL) {
545 pslash = strrchr(buf, '/');
546 if (pslash != NULL) {
547 *pslash = '\0'; // Get rid of /<arch>.
548 pslash = strrchr(buf, '/');
549 if (pslash != NULL) {
550 *pslash = '\0'; // Get rid of /lib.
551 }
552 }
553 }
554 Arguments::set_java_home(buf);
555 set_boot_path('/', ':');
556 }
557
558 // Where to look for native libraries.
559
560 // On Aix we get the user setting of LIBPATH.
561 // Eventually, all the library path setting will be done here.
562 // Get the user setting of LIBPATH.
563 const char *v = ::getenv("LIBPATH");
564 const char *v_colon = ":";
565 if (v == NULL) { v = ""; v_colon = ""; }
566
567 // Concatenate user and invariant part of ld_library_path.
568 // That's +1 for the colon and +1 for the trailing '\0'.
569 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
570 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
571 Arguments::set_library_path(ld_library_path);
572 FREE_C_HEAP_ARRAY(char, ld_library_path);
573
574 // Extensions directories.
575 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
576 Arguments::set_ext_dirs(buf);
577
578 FREE_C_HEAP_ARRAY(char, buf);
579
580 #undef DEFAULT_LIBPATH
581 #undef EXTENSIONS_DIR
582 }
583
584 ////////////////////////////////////////////////////////////////////////////////
585 // breakpoint support
586
587 void os::breakpoint() {
588 BREAKPOINT;
589 }
590
591 extern "C" void breakpoint() {
592 // use debugger to set breakpoint here
593 }
594
595 ////////////////////////////////////////////////////////////////////////////////
596 // signal support
597
598 debug_only(static bool signal_sets_initialized = false);
599 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
600
601 bool os::Aix::is_sig_ignored(int sig) {
602 struct sigaction oact;
603 sigaction(sig, (struct sigaction*)NULL, &oact);
604 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
605 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
606 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
607 return true;
608 else
609 return false;
610 }
611
612 void os::Aix::signal_sets_init() {
613 // Should also have an assertion stating we are still single-threaded.
614 assert(!signal_sets_initialized, "Already initialized");
615 // Fill in signals that are necessarily unblocked for all threads in
616 // the VM. Currently, we unblock the following signals:
617 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
618 // by -Xrs (=ReduceSignalUsage));
619 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
620 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
621 // the dispositions or masks wrt these signals.
622 // Programs embedding the VM that want to use the above signals for their
623 // own purposes must, at this time, use the "-Xrs" option to prevent
624 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
625 // (See bug 4345157, and other related bugs).
626 // In reality, though, unblocking these signals is really a nop, since
627 // these signals are not blocked by default.
628 sigemptyset(&unblocked_sigs);
629 sigemptyset(&allowdebug_blocked_sigs);
630 sigaddset(&unblocked_sigs, SIGILL);
631 sigaddset(&unblocked_sigs, SIGSEGV);
632 sigaddset(&unblocked_sigs, SIGBUS);
633 sigaddset(&unblocked_sigs, SIGFPE);
634 sigaddset(&unblocked_sigs, SIGTRAP);
635 sigaddset(&unblocked_sigs, SIGDANGER);
636 sigaddset(&unblocked_sigs, SR_signum);
637
638 if (!ReduceSignalUsage) {
639 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
640 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
641 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
642 }
643 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
644 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
645 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
646 }
647 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
648 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
649 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
650 }
651 }
652 // Fill in signals that are blocked by all but the VM thread.
653 sigemptyset(&vm_sigs);
654 if (!ReduceSignalUsage)
655 sigaddset(&vm_sigs, BREAK_SIGNAL);
656 debug_only(signal_sets_initialized = true);
657 }
658
659 // These are signals that are unblocked while a thread is running Java.
660 // (For some reason, they get blocked by default.)
661 sigset_t* os::Aix::unblocked_signals() {
662 assert(signal_sets_initialized, "Not initialized");
663 return &unblocked_sigs;
664 }
665
666 // These are the signals that are blocked while a (non-VM) thread is
667 // running Java. Only the VM thread handles these signals.
668 sigset_t* os::Aix::vm_signals() {
669 assert(signal_sets_initialized, "Not initialized");
670 return &vm_sigs;
671 }
672
673 // These are signals that are blocked during cond_wait to allow debugger in
674 sigset_t* os::Aix::allowdebug_blocked_signals() {
675 assert(signal_sets_initialized, "Not initialized");
676 return &allowdebug_blocked_sigs;
677 }
678
679 void os::Aix::hotspot_sigmask(Thread* thread) {
680
681 //Save caller's signal mask before setting VM signal mask
682 sigset_t caller_sigmask;
683 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
684
685 OSThread* osthread = thread->osthread();
686 osthread->set_caller_sigmask(caller_sigmask);
687
688 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
689
690 if (!ReduceSignalUsage) {
691 if (thread->is_VM_thread()) {
692 // Only the VM thread handles BREAK_SIGNAL ...
693 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
694 } else {
695 // ... all other threads block BREAK_SIGNAL
696 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
697 }
698 }
699 }
700
701 // retrieve memory information.
702 // Returns false if something went wrong;
703 // content of pmi undefined in this case.
704 bool os::Aix::get_meminfo(meminfo_t* pmi) {
705
706 assert(pmi, "get_meminfo: invalid parameter");
707
708 memset(pmi, 0, sizeof(meminfo_t));
709
710 if (os::Aix::on_pase()) {
711
712 Unimplemented();
713 return false;
714
715 } else {
716
717 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
718 // See:
719 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
720 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
721 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
722 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
723
724 perfstat_memory_total_t psmt;
725 memset (&psmt, '\0', sizeof(psmt));
726 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
727 if (rc == -1) {
728 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
729 assert(0, "perfstat_memory_total() failed");
730 return false;
731 }
732
733 assert(rc == 1, "perfstat_memory_total() - weird return code");
734
735 // excerpt from
736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
737 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
738 // The fields of perfstat_memory_total_t:
739 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
740 // u_longlong_t real_total Total real memory (in 4 KB pages).
741 // u_longlong_t real_free Free real memory (in 4 KB pages).
742 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
743 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
744
745 pmi->virt_total = psmt.virt_total * 4096;
746 pmi->real_total = psmt.real_total * 4096;
747 pmi->real_free = psmt.real_free * 4096;
748 pmi->pgsp_total = psmt.pgsp_total * 4096;
749 pmi->pgsp_free = psmt.pgsp_free * 4096;
750
751 return true;
752
753 }
754 } // end os::Aix::get_meminfo
755
756 // Retrieve global cpu information.
757 // Returns false if something went wrong;
758 // the content of pci is undefined in this case.
759 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
760 assert(pci, "get_cpuinfo: invalid parameter");
761 memset(pci, 0, sizeof(cpuinfo_t));
762
763 perfstat_cpu_total_t psct;
764 memset (&psct, '\0', sizeof(psct));
765
766 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
767 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
768 assert(0, "perfstat_cpu_total() failed");
769 return false;
770 }
771
772 // global cpu information
773 strcpy (pci->description, psct.description);
774 pci->processorHZ = psct.processorHZ;
775 pci->ncpus = psct.ncpus;
776 os::Aix::_logical_cpus = psct.ncpus;
777 for (int i = 0; i < 3; i++) {
778 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
779 }
780
781 // get the processor version from _system_configuration
782 switch (_system_configuration.version) {
783 case PV_7:
784 strcpy(pci->version, "Power PC 7");
785 break;
786 case PV_6_1:
787 strcpy(pci->version, "Power PC 6 DD1.x");
788 break;
789 case PV_6:
790 strcpy(pci->version, "Power PC 6");
791 break;
792 case PV_5:
793 strcpy(pci->version, "Power PC 5");
794 break;
795 case PV_5_2:
796 strcpy(pci->version, "Power PC 5_2");
797 break;
798 case PV_5_3:
799 strcpy(pci->version, "Power PC 5_3");
800 break;
801 case PV_5_Compat:
802 strcpy(pci->version, "PV_5_Compat");
803 break;
804 case PV_6_Compat:
805 strcpy(pci->version, "PV_6_Compat");
806 break;
807 case PV_7_Compat:
808 strcpy(pci->version, "PV_7_Compat");
809 break;
810 default:
811 strcpy(pci->version, "unknown");
812 }
813
814 return true;
815
816 } //end os::Aix::get_cpuinfo
817
818 //////////////////////////////////////////////////////////////////////////////
819 // detecting pthread library
820
821 void os::Aix::libpthread_init() {
822 return;
823 }
824
825 //////////////////////////////////////////////////////////////////////////////
826 // create new thread
827
828 // Thread start routine for all newly created threads
829 static void *java_start(Thread *thread) {
830
831 // find out my own stack dimensions
832 {
833 // actually, this should do exactly the same as thread->record_stack_base_and_size...
834 address base = 0;
835 size_t size = 0;
836 query_stack_dimensions(&base, &size);
837 thread->set_stack_base(base);
838 thread->set_stack_size(size);
839 }
840
841 // Do some sanity checks.
842 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
843
844 // Try to randomize the cache line index of hot stack frames.
845 // This helps when threads of the same stack traces evict each other's
846 // cache lines. The threads can be either from the same JVM instance, or
847 // from different JVM instances. The benefit is especially true for
848 // processors with hyperthreading technology.
849
850 static int counter = 0;
851 int pid = os::current_process_id();
852 alloca(((pid ^ counter++) & 7) * 128);
853
854 ThreadLocalStorage::set_thread(thread);
855
856 OSThread* osthread = thread->osthread();
857
858 // thread_id is kernel thread id (similar to Solaris LWP id)
859 osthread->set_thread_id(os::Aix::gettid());
860
861 // initialize signal mask for this thread
862 os::Aix::hotspot_sigmask(thread);
863
864 // initialize floating point control register
865 os::Aix::init_thread_fpu_state();
866
867 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
868
869 // call one more level start routine
870 thread->run();
871
872 return 0;
873 }
874
875 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
876
877 // We want the whole function to be synchronized.
878 ThreadCritical cs;
879
880 assert(thread->osthread() == NULL, "caller responsible");
881
882 // Allocate the OSThread object
883 OSThread* osthread = new OSThread(NULL, NULL);
884 if (osthread == NULL) {
885 return false;
886 }
887
888 // set the correct thread state
889 osthread->set_thread_type(thr_type);
890
891 // Initial state is ALLOCATED but not INITIALIZED
892 osthread->set_state(ALLOCATED);
893
894 thread->set_osthread(osthread);
895
896 // init thread attributes
897 pthread_attr_t attr;
898 pthread_attr_init(&attr);
899 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
900
901 // Make sure we run in 1:1 kernel-user-thread mode.
902 if (os::Aix::on_aix()) {
903 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
904 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
905 } // end: aix
906
907 // Start in suspended state, and in os::thread_start, wake the thread up.
908 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
909
910 // calculate stack size if it's not specified by caller
911 if (os::Aix::supports_variable_stack_size()) {
912 if (stack_size == 0) {
913 stack_size = os::Aix::default_stack_size(thr_type);
914
915 switch (thr_type) {
916 case os::java_thread:
917 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
918 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
919 stack_size = JavaThread::stack_size_at_create();
920 break;
921 case os::compiler_thread:
922 if (CompilerThreadStackSize > 0) {
923 stack_size = (size_t)(CompilerThreadStackSize * K);
924 break;
925 } // else fall through:
926 // use VMThreadStackSize if CompilerThreadStackSize is not defined
927 case os::vm_thread:
928 case os::pgc_thread:
929 case os::cgc_thread:
930 case os::watcher_thread:
931 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
932 break;
933 }
934 }
935
936 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
937 pthread_attr_setstacksize(&attr, stack_size);
938 } //else let thread_create() pick the default value (96 K on AIX)
939
940 pthread_t tid;
941 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
942
943 pthread_attr_destroy(&attr);
944
945 if (ret != 0) {
946 if (PrintMiscellaneous && (Verbose || WizardMode)) {
947 perror("pthread_create()");
948 }
949 // Need to clean up stuff we've allocated so far
950 thread->set_osthread(NULL);
951 delete osthread;
952 return false;
953 }
954
955 // Store pthread info into the OSThread
956 osthread->set_pthread_id(tid);
957
958 return true;
959 }
960
961 /////////////////////////////////////////////////////////////////////////////
962 // attach existing thread
963
964 // bootstrap the main thread
965 bool os::create_main_thread(JavaThread* thread) {
966 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
967 return create_attached_thread(thread);
968 }
969
970 bool os::create_attached_thread(JavaThread* thread) {
971 #ifdef ASSERT
972 thread->verify_not_published();
973 #endif
974
975 // Allocate the OSThread object
976 OSThread* osthread = new OSThread(NULL, NULL);
977
978 if (osthread == NULL) {
979 return false;
980 }
981
982 // Store pthread info into the OSThread
983 osthread->set_thread_id(os::Aix::gettid());
984 osthread->set_pthread_id(::pthread_self());
985
986 // initialize floating point control register
987 os::Aix::init_thread_fpu_state();
988
989 // some sanity checks
990 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
991
992 // Initial thread state is RUNNABLE
993 osthread->set_state(RUNNABLE);
994
995 thread->set_osthread(osthread);
996
997 if (UseNUMA) {
998 int lgrp_id = os::numa_get_group_id();
999 if (lgrp_id != -1) {
1000 thread->set_lgrp_id(lgrp_id);
1001 }
1002 }
1003
1004 // initialize signal mask for this thread
1005 // and save the caller's signal mask
1006 os::Aix::hotspot_sigmask(thread);
1007
1008 return true;
1009 }
1010
1011 void os::pd_start_thread(Thread* thread) {
1012 int status = pthread_continue_np(thread->osthread()->pthread_id());
1013 assert(status == 0, "thr_continue failed");
1014 }
1015
1016 // Free OS resources related to the OSThread
1017 void os::free_thread(OSThread* osthread) {
1018 assert(osthread != NULL, "osthread not set");
1019
1020 if (Thread::current()->osthread() == osthread) {
1021 // Restore caller's signal mask
1022 sigset_t sigmask = osthread->caller_sigmask();
1023 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1024 }
1025
1026 delete osthread;
1027 }
1028
1029 //////////////////////////////////////////////////////////////////////////////
1030 // thread local storage
1031
1032 int os::allocate_thread_local_storage() {
1033 pthread_key_t key;
1034 int rslt = pthread_key_create(&key, NULL);
1035 assert(rslt == 0, "cannot allocate thread local storage");
1036 return (int)key;
1037 }
1038
1039 // Note: This is currently not used by VM, as we don't destroy TLS key
1040 // on VM exit.
1041 void os::free_thread_local_storage(int index) {
1042 int rslt = pthread_key_delete((pthread_key_t)index);
1043 assert(rslt == 0, "invalid index");
1044 }
1045
1046 void os::thread_local_storage_at_put(int index, void* value) {
1047 int rslt = pthread_setspecific((pthread_key_t)index, value);
1048 assert(rslt == 0, "pthread_setspecific failed");
1049 }
1050
1051 extern "C" Thread* get_thread() {
1052 return ThreadLocalStorage::thread();
1053 }
1054
1055 ////////////////////////////////////////////////////////////////////////////////
1056 // time support
1057
1058 // Time since start-up in seconds to a fine granularity.
1059 // Used by VMSelfDestructTimer and the MemProfiler.
1060 double os::elapsedTime() {
1061 return (double)(os::elapsed_counter()) * 0.000001;
1062 }
1063
1064 jlong os::elapsed_counter() {
1065 timeval time;
1066 int status = gettimeofday(&time, NULL);
1067 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1068 }
1069
1070 jlong os::elapsed_frequency() {
1071 return (1000 * 1000);
1072 }
1073
1074 bool os::supports_vtime() { return true; }
1075 bool os::enable_vtime() { return false; }
1076 bool os::vtime_enabled() { return false; }
1077
1078 double os::elapsedVTime() {
1079 struct rusage usage;
1080 int retval = getrusage(RUSAGE_THREAD, &usage);
1081 if (retval == 0) {
1082 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1083 } else {
1084 // better than nothing, but not much
1085 return elapsedTime();
1086 }
1087 }
1088
1089 jlong os::javaTimeMillis() {
1090 timeval time;
1091 int status = gettimeofday(&time, NULL);
1092 assert(status != -1, "aix error at gettimeofday()");
1093 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1094 }
1095
1096 // We need to manually declare mread_real_time,
1097 // because IBM didn't provide a prototype in time.h.
1098 // (they probably only ever tested in C, not C++)
1099 extern "C"
1100 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1101
1102 jlong os::javaTimeNanos() {
1103 if (os::Aix::on_pase()) {
1104 Unimplemented();
1105 return 0;
1106 }
1107 else {
1108 // On AIX use the precision of processors real time clock
1109 // or time base registers.
1110 timebasestruct_t time;
1111 int rc;
1112
1113 // If the CPU has a time register, it will be used and
1114 // we have to convert to real time first. After convertion we have following data:
1115 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1116 // time.tb_low [nanoseconds after the last full second above]
1117 // We better use mread_real_time here instead of read_real_time
1118 // to ensure that we will get a monotonic increasing time.
1119 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1120 rc = time_base_to_time(&time, TIMEBASE_SZ);
1121 assert(rc != -1, "aix error at time_base_to_time()");
1122 }
1123 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1124 }
1125 }
1126
1127 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1128 info_ptr->max_value = ALL_64_BITS;
1129 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1130 info_ptr->may_skip_backward = false;
1131 info_ptr->may_skip_forward = false;
1132 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1133 }
1134
1135 // Return the real, user, and system times in seconds from an
1136 // arbitrary fixed point in the past.
1137 bool os::getTimesSecs(double* process_real_time,
1138 double* process_user_time,
1139 double* process_system_time) {
1140 struct tms ticks;
1141 clock_t real_ticks = times(&ticks);
1142
1143 if (real_ticks == (clock_t) (-1)) {
1144 return false;
1145 } else {
1146 double ticks_per_second = (double) clock_tics_per_sec;
1147 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1148 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1149 *process_real_time = ((double) real_ticks) / ticks_per_second;
1150
1151 return true;
1152 }
1153 }
1154
1155
1156 char * os::local_time_string(char *buf, size_t buflen) {
1157 struct tm t;
1158 time_t long_time;
1159 time(&long_time);
1160 localtime_r(&long_time, &t);
1161 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1162 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1163 t.tm_hour, t.tm_min, t.tm_sec);
1164 return buf;
1165 }
1166
1167 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1168 return localtime_r(clock, res);
1169 }
1170
1171 ////////////////////////////////////////////////////////////////////////////////
1172 // runtime exit support
1173
1174 // Note: os::shutdown() might be called very early during initialization, or
1175 // called from signal handler. Before adding something to os::shutdown(), make
1176 // sure it is async-safe and can handle partially initialized VM.
1177 void os::shutdown() {
1178
1179 // allow PerfMemory to attempt cleanup of any persistent resources
1180 perfMemory_exit();
1181
1182 // needs to remove object in file system
1183 AttachListener::abort();
1184
1185 // flush buffered output, finish log files
1186 ostream_abort();
1187
1188 // Check for abort hook
1189 abort_hook_t abort_hook = Arguments::abort_hook();
1190 if (abort_hook != NULL) {
1191 abort_hook();
1192 }
1193
1194 }
1195
1196 // Note: os::abort() might be called very early during initialization, or
1197 // called from signal handler. Before adding something to os::abort(), make
1198 // sure it is async-safe and can handle partially initialized VM.
1199 void os::abort(bool dump_core) {
1200 os::shutdown();
1201 if (dump_core) {
1202 #ifndef PRODUCT
1203 fdStream out(defaultStream::output_fd());
1204 out.print_raw("Current thread is ");
1205 char buf[16];
1206 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1207 out.print_raw_cr(buf);
1208 out.print_raw_cr("Dumping core ...");
1209 #endif
1210 ::abort(); // dump core
1211 }
1212
1213 ::exit(1);
1214 }
1215
1216 // Die immediately, no exit hook, no abort hook, no cleanup.
1217 void os::die() {
1218 ::abort();
1219 }
1220
1221 // This method is a copy of JDK's sysGetLastErrorString
1222 // from src/solaris/hpi/src/system_md.c
1223
1224 size_t os::lasterror(char *buf, size_t len) {
1225
1226 if (errno == 0) return 0;
1227
1228 const char *s = ::strerror(errno);
1229 size_t n = ::strlen(s);
1230 if (n >= len) {
1231 n = len - 1;
1232 }
1233 ::strncpy(buf, s, n);
1234 buf[n] = '\0';
1235 return n;
1236 }
1237
1238 intx os::current_thread_id() { return (intx)pthread_self(); }
1239 int os::current_process_id() {
1240
1241 // This implementation returns a unique pid, the pid of the
1242 // launcher thread that starts the vm 'process'.
1243
1244 // Under POSIX, getpid() returns the same pid as the
1245 // launcher thread rather than a unique pid per thread.
1246 // Use gettid() if you want the old pre NPTL behaviour.
1247
1248 // if you are looking for the result of a call to getpid() that
1249 // returns a unique pid for the calling thread, then look at the
1250 // OSThread::thread_id() method in osThread_linux.hpp file
1251
1252 return (int)(_initial_pid ? _initial_pid : getpid());
1253 }
1254
1255 // DLL functions
1256
1257 const char* os::dll_file_extension() { return ".so"; }
1258
1259 // This must be hard coded because it's the system's temporary
1260 // directory not the java application's temp directory, ala java.io.tmpdir.
1261 const char* os::get_temp_directory() { return "/tmp"; }
1262
1263 static bool file_exists(const char* filename) {
1264 struct stat statbuf;
1265 if (filename == NULL || strlen(filename) == 0) {
1266 return false;
1267 }
1268 return os::stat(filename, &statbuf) == 0;
1269 }
1270
1271 bool os::dll_build_name(char* buffer, size_t buflen,
1272 const char* pname, const char* fname) {
1273 bool retval = false;
1274 // Copied from libhpi
1275 const size_t pnamelen = pname ? strlen(pname) : 0;
1276
1277 // Return error on buffer overflow.
1278 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1279 *buffer = '\0';
1280 return retval;
1281 }
1282
1283 if (pnamelen == 0) {
1284 snprintf(buffer, buflen, "lib%s.so", fname);
1285 retval = true;
1286 } else if (strchr(pname, *os::path_separator()) != NULL) {
1287 int n;
1288 char** pelements = split_path(pname, &n);
1289 for (int i = 0; i < n; i++) {
1290 // Really shouldn't be NULL, but check can't hurt
1291 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1292 continue; // skip the empty path values
1293 }
1294 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1295 if (file_exists(buffer)) {
1296 retval = true;
1297 break;
1298 }
1299 }
1300 // release the storage
1301 for (int i = 0; i < n; i++) {
1302 if (pelements[i] != NULL) {
1303 FREE_C_HEAP_ARRAY(char, pelements[i]);
1304 }
1305 }
1306 if (pelements != NULL) {
1307 FREE_C_HEAP_ARRAY(char*, pelements);
1308 }
1309 } else {
1310 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1311 retval = true;
1312 }
1313 return retval;
1314 }
1315
1316 // Check if addr is inside libjvm.so.
1317 bool os::address_is_in_vm(address addr) {
1318
1319 // Input could be a real pc or a function pointer literal. The latter
1320 // would be a function descriptor residing in the data segment of a module.
1321
1322 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1323 if (lib) {
1324 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1325 return true;
1326 } else {
1327 return false;
1328 }
1329 } else {
1330 lib = LoadedLibraries::find_for_data_address(addr);
1331 if (lib) {
1332 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1333 return true;
1334 } else {
1335 return false;
1336 }
1337 } else {
1338 return false;
1339 }
1340 }
1341 }
1342
1343 // Resolve an AIX function descriptor literal to a code pointer.
1344 // If the input is a valid code pointer to a text segment of a loaded module,
1345 // it is returned unchanged.
1346 // If the input is a valid AIX function descriptor, it is resolved to the
1347 // code entry point.
1348 // If the input is neither a valid function descriptor nor a valid code pointer,
1349 // NULL is returned.
1350 static address resolve_function_descriptor_to_code_pointer(address p) {
1351
1352 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1353 if (lib) {
1354 // its a real code pointer
1355 return p;
1356 } else {
1357 lib = LoadedLibraries::find_for_data_address(p);
1358 if (lib) {
1359 // pointer to data segment, potential function descriptor
1360 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1361 if (LoadedLibraries::find_for_text_address(code_entry)) {
1362 // Its a function descriptor
1363 return code_entry;
1364 }
1365 }
1366 }
1367 return NULL;
1368 }
1369
1370 bool os::dll_address_to_function_name(address addr, char *buf,
1371 int buflen, int *offset) {
1372 if (offset) {
1373 *offset = -1;
1374 }
1375 if (buf) {
1376 buf[0] = '\0';
1377 }
1378
1379 // Resolve function ptr literals first.
1380 addr = resolve_function_descriptor_to_code_pointer(addr);
1381 if (!addr) {
1382 return false;
1383 }
1384
1385 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1386 return Decoder::decode(addr, buf, buflen, offset);
1387 }
1388
1389 static int getModuleName(codeptr_t pc, // [in] program counter
1390 char* p_name, size_t namelen, // [out] optional: function name
1391 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1392 ) {
1393
1394 // initialize output parameters
1395 if (p_name && namelen > 0) {
1396 *p_name = '\0';
1397 }
1398 if (p_errmsg && errmsglen > 0) {
1399 *p_errmsg = '\0';
1400 }
1401
1402 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1403 if (lib) {
1404 if (p_name && namelen > 0) {
1405 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1406 }
1407 return 0;
1408 }
1409
1410 if (Verbose) {
1411 fprintf(stderr, "pc outside any module");
1412 }
1413
1414 return -1;
1415
1416 }
1417
1418 bool os::dll_address_to_library_name(address addr, char* buf,
1419 int buflen, int* offset) {
1420 if (offset) {
1421 *offset = -1;
1422 }
1423 if (buf) {
1424 buf[0] = '\0';
1425 }
1426
1427 // Resolve function ptr literals first.
1428 addr = resolve_function_descriptor_to_code_pointer(addr);
1429 if (!addr) {
1430 return false;
1431 }
1432
1433 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1434 return true;
1435 }
1436 return false;
1437 }
1438
1439 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1440 // for the same architecture as Hotspot is running on
1441 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1442
1443 if (ebuf && ebuflen > 0) {
1444 ebuf[0] = '\0';
1445 ebuf[ebuflen - 1] = '\0';
1446 }
1447
1448 if (!filename || strlen(filename) == 0) {
1449 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1450 return NULL;
1451 }
1452
1453 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1454 void * result= ::dlopen(filename, RTLD_LAZY);
1455 if (result != NULL) {
1456 // Reload dll cache. Don't do this in signal handling.
1457 LoadedLibraries::reload();
1458 return result;
1459 } else {
1460 // error analysis when dlopen fails
1461 const char* const error_report = ::dlerror();
1462 if (error_report && ebuf && ebuflen > 0) {
1463 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1464 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1465 }
1466 }
1467 return NULL;
1468 }
1469
1470 // Glibc-2.0 libdl is not MT safe. If you are building with any glibc,
1471 // chances are you might want to run the generated bits against glibc-2.0
1472 // libdl.so, so always use locking for any version of glibc.
1473 void* os::dll_lookup(void* handle, const char* name) {
1474 pthread_mutex_lock(&dl_mutex);
1475 void* res = dlsym(handle, name);
1476 pthread_mutex_unlock(&dl_mutex);
1477 return res;
1478 }
1479
1480 void* os::get_default_process_handle() {
1481 return (void*)::dlopen(NULL, RTLD_LAZY);
1482 }
1483
1484 void os::print_dll_info(outputStream *st) {
1485 st->print_cr("Dynamic libraries:");
1486 LoadedLibraries::print(st);
1487 }
1488
1489 void os::print_os_info(outputStream* st) {
1490 st->print("OS:");
1491
1492 st->print("uname:");
1493 struct utsname name;
1494 uname(&name);
1495 st->print(name.sysname); st->print(" ");
1496 st->print(name.nodename); st->print(" ");
1497 st->print(name.release); st->print(" ");
1498 st->print(name.version); st->print(" ");
1499 st->print(name.machine);
1500 st->cr();
1501
1502 // rlimit
1503 st->print("rlimit:");
1504 struct rlimit rlim;
1505
1506 st->print(" STACK ");
1507 getrlimit(RLIMIT_STACK, &rlim);
1508 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1509 else st->print("%uk", rlim.rlim_cur >> 10);
1510
1511 st->print(", CORE ");
1512 getrlimit(RLIMIT_CORE, &rlim);
1513 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1514 else st->print("%uk", rlim.rlim_cur >> 10);
1515
1516 st->print(", NPROC ");
1517 st->print("%d", sysconf(_SC_CHILD_MAX));
1518
1519 st->print(", NOFILE ");
1520 getrlimit(RLIMIT_NOFILE, &rlim);
1521 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1522 else st->print("%d", rlim.rlim_cur);
1523
1524 st->print(", AS ");
1525 getrlimit(RLIMIT_AS, &rlim);
1526 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1527 else st->print("%uk", rlim.rlim_cur >> 10);
1528
1529 // Print limits on DATA, because it limits the C-heap.
1530 st->print(", DATA ");
1531 getrlimit(RLIMIT_DATA, &rlim);
1532 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1533 else st->print("%uk", rlim.rlim_cur >> 10);
1534 st->cr();
1535
1536 // load average
1537 st->print("load average:");
1538 double loadavg[3] = {-1.L, -1.L, -1.L};
1539 os::loadavg(loadavg, 3);
1540 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1541 st->cr();
1542 }
1543
1544 void os::print_memory_info(outputStream* st) {
1545
1546 st->print_cr("Memory:");
1547
1548 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1549 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1550 st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size()));
1551 st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no"));
1552 st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no"));
1553 if (g_multipage_error != 0) {
1554 st->print_cr(" multipage error: %d", g_multipage_error);
1555 }
1556
1557 // print out LDR_CNTRL because it affects the default page sizes
1558 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1559 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1560
1561 const char* const extshm = ::getenv("EXTSHM");
1562 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1563
1564 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1565 os::Aix::meminfo_t mi;
1566 if (os::Aix::get_meminfo(&mi)) {
1567 char buffer[256];
1568 if (os::Aix::on_aix()) {
1569 jio_snprintf(buffer, sizeof(buffer),
1570 " physical total : %llu\n"
1571 " physical free : %llu\n"
1572 " swap total : %llu\n"
1573 " swap free : %llu\n",
1574 mi.real_total,
1575 mi.real_free,
1576 mi.pgsp_total,
1577 mi.pgsp_free);
1578 } else {
1579 Unimplemented();
1580 }
1581 st->print_raw(buffer);
1582 } else {
1583 st->print_cr(" (no more information available)");
1584 }
1585 }
1586
1587 void os::pd_print_cpu_info(outputStream* st) {
1588 // cpu
1589 st->print("CPU:");
1590 st->print("total %d", os::processor_count());
1591 // It's not safe to query number of active processors after crash
1592 // st->print("(active %d)", os::active_processor_count());
1593 st->print(" %s", VM_Version::cpu_features());
1594 st->cr();
1595 }
1596
1597 void os::print_siginfo(outputStream* st, void* siginfo) {
1598 // Use common posix version.
1599 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1600 st->cr();
1601 }
1602
1603
1604 static void print_signal_handler(outputStream* st, int sig,
1605 char* buf, size_t buflen);
1606
1607 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1608 st->print_cr("Signal Handlers:");
1609 print_signal_handler(st, SIGSEGV, buf, buflen);
1610 print_signal_handler(st, SIGBUS , buf, buflen);
1611 print_signal_handler(st, SIGFPE , buf, buflen);
1612 print_signal_handler(st, SIGPIPE, buf, buflen);
1613 print_signal_handler(st, SIGXFSZ, buf, buflen);
1614 print_signal_handler(st, SIGILL , buf, buflen);
1615 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1616 print_signal_handler(st, SR_signum, buf, buflen);
1617 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1618 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1619 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1620 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1621 print_signal_handler(st, SIGTRAP, buf, buflen);
1622 print_signal_handler(st, SIGDANGER, buf, buflen);
1623 }
1624
1625 static char saved_jvm_path[MAXPATHLEN] = {0};
1626
1627 // Find the full path to the current module, libjvm.so or libjvm_g.so
1628 void os::jvm_path(char *buf, jint buflen) {
1629 // Error checking.
1630 if (buflen < MAXPATHLEN) {
1631 assert(false, "must use a large-enough buffer");
1632 buf[0] = '\0';
1633 return;
1634 }
1635 // Lazy resolve the path to current module.
1636 if (saved_jvm_path[0] != 0) {
1637 strcpy(buf, saved_jvm_path);
1638 return;
1639 }
1640
1641 Dl_info dlinfo;
1642 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1643 assert(ret != 0, "cannot locate libjvm");
1644 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1645 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1646
1647 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1648 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1649 }
1650
1651 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1652 // no prefix required, not even "_"
1653 }
1654
1655 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1656 // no suffix required
1657 }
1658
1659 ////////////////////////////////////////////////////////////////////////////////
1660 // sun.misc.Signal support
1661
1662 static volatile jint sigint_count = 0;
1663
1664 static void
1665 UserHandler(int sig, void *siginfo, void *context) {
1666 // 4511530 - sem_post is serialized and handled by the manager thread. When
1667 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1668 // don't want to flood the manager thread with sem_post requests.
1669 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1670 return;
1671
1672 // Ctrl-C is pressed during error reporting, likely because the error
1673 // handler fails to abort. Let VM die immediately.
1674 if (sig == SIGINT && is_error_reported()) {
1675 os::die();
1676 }
1677
1678 os::signal_notify(sig);
1679 }
1680
1681 void* os::user_handler() {
1682 return CAST_FROM_FN_PTR(void*, UserHandler);
1683 }
1684
1685 extern "C" {
1686 typedef void (*sa_handler_t)(int);
1687 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1688 }
1689
1690 void* os::signal(int signal_number, void* handler) {
1691 struct sigaction sigAct, oldSigAct;
1692
1693 sigfillset(&(sigAct.sa_mask));
1694
1695 // Do not block out synchronous signals in the signal handler.
1696 // Blocking synchronous signals only makes sense if you can really
1697 // be sure that those signals won't happen during signal handling,
1698 // when the blocking applies. Normal signal handlers are lean and
1699 // do not cause signals. But our signal handlers tend to be "risky"
1700 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1701 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1702 // by a SIGILL, which was blocked due to the signal mask. The process
1703 // just hung forever. Better to crash from a secondary signal than to hang.
1704 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1705 sigdelset(&(sigAct.sa_mask), SIGBUS);
1706 sigdelset(&(sigAct.sa_mask), SIGILL);
1707 sigdelset(&(sigAct.sa_mask), SIGFPE);
1708 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1709
1710 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1711
1712 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1713
1714 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1715 // -1 means registration failed
1716 return (void *)-1;
1717 }
1718
1719 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1720 }
1721
1722 void os::signal_raise(int signal_number) {
1723 ::raise(signal_number);
1724 }
1725
1726 //
1727 // The following code is moved from os.cpp for making this
1728 // code platform specific, which it is by its very nature.
1729 //
1730
1731 // Will be modified when max signal is changed to be dynamic
1732 int os::sigexitnum_pd() {
1733 return NSIG;
1734 }
1735
1736 // a counter for each possible signal value
1737 static volatile jint pending_signals[NSIG+1] = { 0 };
1738
1739 // Linux(POSIX) specific hand shaking semaphore.
1740 static sem_t sig_sem;
1741
1742 void os::signal_init_pd() {
1743 // Initialize signal structures
1744 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1745
1746 // Initialize signal semaphore
1747 int rc = ::sem_init(&sig_sem, 0, 0);
1748 guarantee(rc != -1, "sem_init failed");
1749 }
1750
1751 void os::signal_notify(int sig) {
1752 Atomic::inc(&pending_signals[sig]);
1753 ::sem_post(&sig_sem);
1754 }
1755
1756 static int check_pending_signals(bool wait) {
1757 Atomic::store(0, &sigint_count);
1758 for (;;) {
1759 for (int i = 0; i < NSIG + 1; i++) {
1760 jint n = pending_signals[i];
1761 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1762 return i;
1763 }
1764 }
1765 if (!wait) {
1766 return -1;
1767 }
1768 JavaThread *thread = JavaThread::current();
1769 ThreadBlockInVM tbivm(thread);
1770
1771 bool threadIsSuspended;
1772 do {
1773 thread->set_suspend_equivalent();
1774 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1775
1776 ::sem_wait(&sig_sem);
1777
1778 // were we externally suspended while we were waiting?
1779 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1780 if (threadIsSuspended) {
1781 //
1782 // The semaphore has been incremented, but while we were waiting
1783 // another thread suspended us. We don't want to continue running
1784 // while suspended because that would surprise the thread that
1785 // suspended us.
1786 //
1787 ::sem_post(&sig_sem);
1788
1789 thread->java_suspend_self();
1790 }
1791 } while (threadIsSuspended);
1792 }
1793 }
1794
1795 int os::signal_lookup() {
1796 return check_pending_signals(false);
1797 }
1798
1799 int os::signal_wait() {
1800 return check_pending_signals(true);
1801 }
1802
1803 ////////////////////////////////////////////////////////////////////////////////
1804 // Virtual Memory
1805
1806 // AddrRange describes an immutable address range
1807 //
1808 // This is a helper class for the 'shared memory bookkeeping' below.
1809 class AddrRange {
1810 friend class ShmBkBlock;
1811
1812 char* _start;
1813 size_t _size;
1814
1815 public:
1816
1817 AddrRange(char* start, size_t size)
1818 : _start(start), _size(size)
1819 {}
1820
1821 AddrRange(const AddrRange& r)
1822 : _start(r.start()), _size(r.size())
1823 {}
1824
1825 char* start() const { return _start; }
1826 size_t size() const { return _size; }
1827 char* end() const { return _start + _size; }
1828 bool is_empty() const { return _size == 0 ? true : false; }
1829
1830 static AddrRange empty_range() { return AddrRange(NULL, 0); }
1831
1832 bool contains(const char* p) const {
1833 return start() <= p && end() > p;
1834 }
1835
1836 bool contains(const AddrRange& range) const {
1837 return start() <= range.start() && end() >= range.end();
1838 }
1839
1840 bool intersects(const AddrRange& range) const {
1841 return (range.start() <= start() && range.end() > start()) ||
1842 (range.start() < end() && range.end() >= end()) ||
1843 contains(range);
1844 }
1845
1846 bool is_same_range(const AddrRange& range) const {
1847 return start() == range.start() && size() == range.size();
1848 }
1849
1850 // return the closest inside range consisting of whole pages
1851 AddrRange find_closest_aligned_range(size_t pagesize) const {
1852 if (pagesize == 0 || is_empty()) {
1853 return empty_range();
1854 }
1855 char* const from = (char*)align_size_up((intptr_t)_start, pagesize);
1856 char* const to = (char*)align_size_down((intptr_t)end(), pagesize);
1857 if (from > to) {
1858 return empty_range();
1859 }
1860 return AddrRange(from, to - from);
1861 }
1862 };
1863
1864 ////////////////////////////////////////////////////////////////////////////
1865 // shared memory bookkeeping
1866 //
1867 // the os::reserve_memory() API and friends hand out different kind of memory, depending
1868 // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat.
1869 //
1870 // But these memory types have to be treated differently. For example, to uncommit
1871 // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory,
1872 // disclaim64() is needed.
1873 //
1874 // Therefore we need to keep track of the allocated memory segments and their
1875 // properties.
1876
1877 // ShmBkBlock: base class for all blocks in the shared memory bookkeeping
1878 class ShmBkBlock : public CHeapObj<mtInternal> {
1879
1880 ShmBkBlock* _next;
1881
1882 protected:
1883
1884 AddrRange _range;
1885 const size_t _pagesize;
1886 const bool _pinned;
1887
1888 public:
1889
1890 ShmBkBlock(AddrRange range, size_t pagesize, bool pinned)
1891 : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) {
1892
1893 assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size");
1894 assert(!_range.is_empty(), "invalid range");
1895 }
1896
1897 virtual void print(outputStream* st) const {
1898 st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s",
1899 _range.start(), _range.end(), _range.size(),
1900 _range.size() / _pagesize, describe_pagesize(_pagesize),
1901 _pinned ? "pinned" : "");
1902 }
1903
1904 enum Type { MMAP, SHMAT };
1905 virtual Type getType() = 0;
1906
1907 char* base() const { return _range.start(); }
1908 size_t size() const { return _range.size(); }
1909
1910 void setAddrRange(AddrRange range) {
1911 _range = range;
1912 }
1913
1914 bool containsAddress(const char* p) const {
1915 return _range.contains(p);
1916 }
1917
1918 bool containsRange(const char* p, size_t size) const {
1919 return _range.contains(AddrRange((char*)p, size));
1920 }
1921
1922 bool isSameRange(const char* p, size_t size) const {
1923 return _range.is_same_range(AddrRange((char*)p, size));
1924 }
1925
1926 virtual bool disclaim(char* p, size_t size) = 0;
1927 virtual bool release() = 0;
1928
1929 // blocks live in a list.
1930 ShmBkBlock* next() const { return _next; }
1931 void set_next(ShmBkBlock* blk) { _next = blk; }
1932
1933 }; // end: ShmBkBlock
1934
1935
1936 // ShmBkMappedBlock: describes an block allocated with mmap()
1937 class ShmBkMappedBlock : public ShmBkBlock {
1938 public:
1939
1940 ShmBkMappedBlock(AddrRange range)
1941 : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned
1942
1943 void print(outputStream* st) const {
1944 ShmBkBlock::print(st);
1945 st->print_cr(" - mmap'ed");
1946 }
1947
1948 Type getType() {
1949 return MMAP;
1950 }
1951
1952 bool disclaim(char* p, size_t size) {
1953
1954 AddrRange r(p, size);
1955
1956 guarantee(_range.contains(r), "invalid disclaim");
1957
1958 // only disclaim whole ranges.
1959 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
1960 if (r2.is_empty()) {
1961 return true;
1962 }
1963
1964 const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE);
1965
1966 if (rc != 0) {
1967 warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno);
1968 }
1969
1970 return rc == 0 ? true : false;
1971 }
1972
1973 bool release() {
1974 // mmap'ed blocks are released using munmap
1975 if (::munmap(_range.start(), _range.size()) != 0) {
1976 warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno);
1977 return false;
1978 }
1979 return true;
1980 }
1981 }; // end: ShmBkMappedBlock
1982
1983 // ShmBkShmatedBlock: describes an block allocated with shmget/shmat()
1984 class ShmBkShmatedBlock : public ShmBkBlock {
1985 public:
1986
1987 ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned)
1988 : ShmBkBlock(range, pagesize, pinned) {}
1989
1990 void print(outputStream* st) const {
1991 ShmBkBlock::print(st);
1992 st->print_cr(" - shmat'ed");
1993 }
1994
1995 Type getType() {
1996 return SHMAT;
1997 }
1998
1999 bool disclaim(char* p, size_t size) {
2000
2001 AddrRange r(p, size);
2002
2003 if (_pinned) {
2004 return true;
2005 }
2006
2007 // shmat'ed blocks are disclaimed using disclaim64
2008 guarantee(_range.contains(r), "invalid disclaim");
2009
2010 // only disclaim whole ranges.
2011 const AddrRange r2 = r.find_closest_aligned_range(_pagesize);
2012 if (r2.is_empty()) {
2013 return true;
2014 }
2015
2016 const bool rc = my_disclaim64(r2.start(), r2.size());
2017
2018 if (Verbose && !rc) {
2019 warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end());
2020 }
2021
2022 return rc;
2023 }
2024
2025 bool release() {
2026 bool rc = false;
2027 if (::shmdt(_range.start()) != 0) {
2028 warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno);
2029 } else {
2030 rc = true;
2031 }
2032 return rc;
2033 }
2034
2035 }; // end: ShmBkShmatedBlock
2036
2037 static ShmBkBlock* g_shmbk_list = NULL;
2038 static volatile jint g_shmbk_table_lock = 0;
2039
2040 // keep some usage statistics
2041 static struct {
2042 int nodes; // number of nodes in list
2043 size_t bytes; // reserved - not committed - bytes.
2044 int reserves; // how often reserve was called
2045 int lookups; // how often a lookup was made
2046 } g_shmbk_stats = { 0, 0, 0, 0 };
2047
2048 // add information about a shared memory segment to the bookkeeping
2049 static void shmbk_register(ShmBkBlock* p_block) {
2050 guarantee(p_block, "logic error");
2051 p_block->set_next(g_shmbk_list);
2052 g_shmbk_list = p_block;
2053 g_shmbk_stats.reserves ++;
2054 g_shmbk_stats.bytes += p_block->size();
2055 g_shmbk_stats.nodes ++;
2056 }
2057
2058 // remove information about a shared memory segment by its starting address
2059 static void shmbk_unregister(ShmBkBlock* p_block) {
2060 ShmBkBlock* p = g_shmbk_list;
2061 ShmBkBlock* prev = NULL;
2062 while (p) {
2063 if (p == p_block) {
2064 if (prev) {
2065 prev->set_next(p->next());
2066 } else {
2067 g_shmbk_list = p->next();
2068 }
2069 g_shmbk_stats.nodes --;
2070 g_shmbk_stats.bytes -= p->size();
2071 return;
2072 }
2073 prev = p;
2074 p = p->next();
2075 }
2076 assert(false, "should not happen");
2077 }
2078
2079 // given a pointer, return shared memory bookkeeping record for the segment it points into
2080 // using the returned block info must happen under lock protection
2081 static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) {
2082 g_shmbk_stats.lookups ++;
2083 ShmBkBlock* p = g_shmbk_list;
2084 while (p) {
2085 if (p->containsAddress(addr)) {
2086 return p;
2087 }
2088 p = p->next();
2089 }
2090 return NULL;
2091 }
2092
2093 // dump all information about all memory segments allocated with os::reserve_memory()
2094 void shmbk_dump_info() {
2095 tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, "
2096 "total reserves: %d total lookups: %d)",
2097 g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups);
2098 const ShmBkBlock* p = g_shmbk_list;
2099 int i = 0;
2100 while (p) {
2101 p->print(tty);
2102 p = p->next();
2103 i ++;
2104 }
2105 }
2106
2107 #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK;
2108 #define UNLOCK_SHMBK }
2109
2110 // End: shared memory bookkeeping
2111 ////////////////////////////////////////////////////////////////////////////////////////////////////
2112
2113 int os::vm_page_size() {
2114 // Seems redundant as all get out
2115 assert(os::Aix::page_size() != -1, "must call os::init");
2116 return os::Aix::page_size();
2117 }
2118
2119 // Aix allocates memory by pages.
2120 int os::vm_allocation_granularity() {
2121 assert(os::Aix::page_size() != -1, "must call os::init");
2122 return os::Aix::page_size();
2123 }
2124
2125 int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) {
2126
2127 // Commit is a noop. There is no explicit commit
2128 // needed on AIX. Memory is committed when touched.
2129 //
2130 // Debug : check address range for validity
2131 #ifdef ASSERT
2132 LOCK_SHMBK
2133 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2134 if (!block) {
2135 fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr);
2136 shmbk_dump_info();
2137 assert(false, "invalid pointer");
2138 return false;
2139 } else if (!block->containsRange(addr, size)) {
2140 fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size);
2141 shmbk_dump_info();
2142 assert(false, "invalid range");
2143 return false;
2144 }
2145 UNLOCK_SHMBK
2146 #endif // ASSERT
2147
2148 return 0;
2149 }
2150
2151 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2152 return os::Aix::commit_memory_impl(addr, size, exec) == 0;
2153 }
2154
2155 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2156 const char* mesg) {
2157 assert(mesg != NULL, "mesg must be specified");
2158 os::Aix::commit_memory_impl(addr, size, exec);
2159 }
2160
2161 int os::Aix::commit_memory_impl(char* addr, size_t size,
2162 size_t alignment_hint, bool exec) {
2163 return os::Aix::commit_memory_impl(addr, size, exec);
2164 }
2165
2166 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
2167 bool exec) {
2168 return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0;
2169 }
2170
2171 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2172 size_t alignment_hint, bool exec,
2173 const char* mesg) {
2174 os::Aix::commit_memory_impl(addr, size, alignment_hint, exec);
2175 }
2176
2177 bool os::pd_uncommit_memory(char* addr, size_t size) {
2178
2179 // Delegate to ShmBkBlock class which knows how to uncommit its memory.
2180
2181 bool rc = false;
2182 LOCK_SHMBK
2183 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2184 if (!block) {
2185 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2186 shmbk_dump_info();
2187 assert(false, "invalid pointer");
2188 return false;
2189 } else if (!block->containsRange(addr, size)) {
2190 fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size);
2191 shmbk_dump_info();
2192 assert(false, "invalid range");
2193 return false;
2194 }
2195 rc = block->disclaim(addr, size);
2196 UNLOCK_SHMBK
2197
2198 if (Verbose && !rc) {
2199 warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size);
2200 }
2201 return rc;
2202 }
2203
2204 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2205 return os::guard_memory(addr, size);
2206 }
2207
2208 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2209 return os::unguard_memory(addr, size);
2210 }
2211
2212 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2213 }
2214
2215 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2216 }
2217
2218 void os::numa_make_global(char *addr, size_t bytes) {
2219 }
2220
2221 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2222 }
2223
2224 bool os::numa_topology_changed() {
2225 return false;
2226 }
2227
2228 size_t os::numa_get_groups_num() {
2229 return 1;
2230 }
2231
2232 int os::numa_get_group_id() {
2233 return 0;
2234 }
2235
2236 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2237 if (size > 0) {
2238 ids[0] = 0;
2239 return 1;
2240 }
2241 return 0;
2242 }
2243
2244 bool os::get_page_info(char *start, page_info* info) {
2245 return false;
2246 }
2247
2248 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2249 return end;
2250 }
2251
2252 // Flags for reserve_shmatted_memory:
2253 #define RESSHM_WISHADDR_OR_FAIL 1
2254 #define RESSHM_TRY_16M_PAGES 2
2255 #define RESSHM_16M_PAGES_OR_FAIL 4
2256
2257 // Result of reserve_shmatted_memory:
2258 struct shmatted_memory_info_t {
2259 char* addr;
2260 size_t pagesize;
2261 bool pinned;
2262 };
2263
2264 // Reserve a section of shmatted memory.
2265 // params:
2266 // bytes [in]: size of memory, in bytes
2267 // requested_addr [in]: wish address.
2268 // NULL = no wish.
2269 // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot
2270 // be obtained, function will fail. Otherwise wish address is treated as hint and
2271 // another pointer is returned.
2272 // flags [in]: some flags. Valid flags are:
2273 // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained.
2274 // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool
2275 // (requires UseLargePages and Use16MPages)
2276 // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail.
2277 // Otherwise any other page size will do.
2278 // p_info [out] : holds information about the created shared memory segment.
2279 static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) {
2280
2281 assert(p_info, "parameter error");
2282
2283 // init output struct.
2284 p_info->addr = NULL;
2285
2286 // neither should we be here for EXTSHM=ON.
2287 if (os::Aix::extshm()) {
2288 ShouldNotReachHere();
2289 }
2290
2291 // extract flags. sanity checks.
2292 const bool wishaddr_or_fail =
2293 flags & RESSHM_WISHADDR_OR_FAIL;
2294 const bool try_16M_pages =
2295 flags & RESSHM_TRY_16M_PAGES;
2296 const bool f16M_pages_or_fail =
2297 flags & RESSHM_16M_PAGES_OR_FAIL;
2298
2299 // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary,
2300 // shmat will fail anyway, so save some cycles by failing right away
2301 if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) {
2302 if (wishaddr_or_fail) {
2303 return false;
2304 } else {
2305 requested_addr = NULL;
2306 }
2307 }
2308
2309 char* addr = NULL;
2310
2311 // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change
2312 // pagesize dynamically.
2313 const size_t size = align_size_up(bytes, SIZE_16M);
2314
2315 // reserve the shared segment
2316 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2317 if (shmid == -1) {
2318 warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno);
2319 return false;
2320 }
2321
2322 // Important note:
2323 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2324 // We must right after attaching it remove it from the system. System V shm segments are global and
2325 // survive the process.
2326 // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm".
2327
2328 // try forcing the page size
2329 size_t pagesize = -1; // unknown so far
2330
2331 if (UseLargePages) {
2332
2333 struct shmid_ds shmbuf;
2334 memset(&shmbuf, 0, sizeof(shmbuf));
2335
2336 // First, try to take from 16M page pool if...
2337 if (os::Aix::can_use_16M_pages() // we can ...
2338 && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages)..
2339 && try_16M_pages) { // caller wants us to.
2340 shmbuf.shm_pagesize = SIZE_16M;
2341 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2342 pagesize = SIZE_16M;
2343 } else {
2344 warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)",
2345 size / SIZE_16M, errno);
2346 if (f16M_pages_or_fail) {
2347 goto cleanup_shm;
2348 }
2349 }
2350 }
2351
2352 // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might,
2353 // because the 64K page pool may also be exhausted.
2354 if (pagesize == -1) {
2355 shmbuf.shm_pagesize = SIZE_64K;
2356 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) {
2357 pagesize = SIZE_64K;
2358 } else {
2359 warning("Failed to allocate %d 64K pages. (shmctl failed with %d)",
2360 size / SIZE_64K, errno);
2361 // here I give up. leave page_size -1 - later, after attaching, we will query the
2362 // real page size of the attached memory. (in theory, it may be something different
2363 // from 4K if LDR_CNTRL SHM_PSIZE is set)
2364 }
2365 }
2366 }
2367
2368 // sanity point
2369 assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size");
2370
2371 // Now attach the shared segment.
2372 addr = (char*) shmat(shmid, requested_addr, 0);
2373 if (addr == (char*)-1) {
2374 // How to handle attach failure:
2375 // If it failed for a specific wish address, tolerate this: in that case, if wish address was
2376 // mandatory, fail, if not, retry anywhere.
2377 // If it failed for any other reason, treat that as fatal error.
2378 addr = NULL;
2379 if (requested_addr) {
2380 if (wishaddr_or_fail) {
2381 goto cleanup_shm;
2382 } else {
2383 addr = (char*) shmat(shmid, NULL, 0);
2384 if (addr == (char*)-1) { // fatal
2385 addr = NULL;
2386 warning("shmat failed (errno: %d)", errno);
2387 goto cleanup_shm;
2388 }
2389 }
2390 } else { // fatal
2391 addr = NULL;
2392 warning("shmat failed (errno: %d)", errno);
2393 goto cleanup_shm;
2394 }
2395 }
2396
2397 // sanity point
2398 assert(addr && addr != (char*) -1, "wrong address");
2399
2400 // after successful Attach remove the segment - right away.
2401 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2402 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2403 guarantee(false, "failed to remove shared memory segment!");
2404 }
2405 shmid = -1;
2406
2407 // query the real page size. In case setting the page size did not work (see above), the system
2408 // may have given us something other then 4K (LDR_CNTRL)
2409 {
2410 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2411 if (pagesize != -1) {
2412 assert(pagesize == real_pagesize, "unexpected pagesize after shmat");
2413 } else {
2414 pagesize = real_pagesize;
2415 }
2416 }
2417
2418 // Now register the reserved block with internal book keeping.
2419 LOCK_SHMBK
2420 const bool pinned = pagesize >= SIZE_16M ? true : false;
2421 ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned);
2422 assert(p_block, "");
2423 shmbk_register(p_block);
2424 UNLOCK_SHMBK
2425
2426 cleanup_shm:
2427
2428 // if we have not done so yet, remove the shared memory segment. This is very important.
2429 if (shmid != -1) {
2430 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2431 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2432 guarantee(false, "failed to remove shared memory segment!");
2433 }
2434 shmid = -1;
2435 }
2436
2437 // trace
2438 if (Verbose && !addr) {
2439 if (requested_addr != NULL) {
2440 warning("failed to shm-allocate 0x%llX bytes at wish address 0x%p.", size, requested_addr);
2441 } else {
2442 warning("failed to shm-allocate 0x%llX bytes at any address.", size);
2443 }
2444 }
2445
2446 // hand info to caller
2447 if (addr) {
2448 p_info->addr = addr;
2449 p_info->pagesize = pagesize;
2450 p_info->pinned = pagesize == SIZE_16M ? true : false;
2451 }
2452
2453 // sanity test:
2454 if (requested_addr && addr && wishaddr_or_fail) {
2455 guarantee(addr == requested_addr, "shmat error");
2456 }
2457
2458 // just one more test to really make sure we have no dangling shm segments.
2459 guarantee(shmid == -1, "dangling shm segments");
2460
2461 return addr ? true : false;
2462
2463 } // end: reserve_shmatted_memory
2464
2465 // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory():
2466 // will return NULL in case of an error.
2467 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) {
2468
2469 // if a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2470 if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) {
2471 warning("Wish address 0x%p not aligned to page boundary.", requested_addr);
2472 return NULL;
2473 }
2474
2475 const size_t size = align_size_up(bytes, SIZE_4K);
2476
2477 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2478 // msync(MS_INVALIDATE) (see os::uncommit_memory)
2479 int flags = MAP_ANONYMOUS | MAP_SHARED;
2480
2481 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2482 // it means if wishaddress is given but MAP_FIXED is not set.
2483 //
2484 // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED
2485 // clobbers the address range, which is probably not what the caller wants. That's
2486 // why I assert here (again) that the SPEC1170 compat mode is off.
2487 // If we want to be able to run under SPEC1170, we have to do some porting and
2488 // testing.
2489 if (requested_addr != NULL) {
2490 assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed.");
2491 flags |= MAP_FIXED;
2492 }
2493
2494 char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2495
2496 if (addr == MAP_FAILED) {
2497 // attach failed: tolerate for specific wish addresses. Not being able to attach
2498 // anywhere is a fatal error.
2499 if (requested_addr == NULL) {
2500 // It's ok to fail here if the machine has not enough memory.
2501 warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno);
2502 }
2503 addr = NULL;
2504 goto cleanup_mmap;
2505 }
2506
2507 // If we did request a specific address and that address was not available, fail.
2508 if (addr && requested_addr) {
2509 guarantee(addr == requested_addr, "unexpected");
2510 }
2511
2512 // register this mmap'ed segment with book keeping
2513 LOCK_SHMBK
2514 ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size));
2515 assert(p_block, "");
2516 shmbk_register(p_block);
2517 UNLOCK_SHMBK
2518
2519 cleanup_mmap:
2520
2521 // trace
2522 if (Verbose) {
2523 if (addr) {
2524 fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes);
2525 }
2526 else {
2527 if (requested_addr != NULL) {
2528 warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr);
2529 } else {
2530 warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes);
2531 }
2532 }
2533 }
2534
2535 return addr;
2536
2537 } // end: reserve_mmaped_memory
2538
2539 // Reserves and attaches a shared memory segment.
2540 // Will assert if a wish address is given and could not be obtained.
2541 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2542 return os::attempt_reserve_memory_at(bytes, requested_addr);
2543 }
2544
2545 bool os::pd_release_memory(char* addr, size_t size) {
2546
2547 // delegate to ShmBkBlock class which knows how to uncommit its memory.
2548
2549 bool rc = false;
2550 LOCK_SHMBK
2551 ShmBkBlock* const block = shmbk_find_by_containing_address(addr);
2552 if (!block) {
2553 fprintf(stderr, "invalid pointer: 0x%p.\n", addr);
2554 shmbk_dump_info();
2555 assert(false, "invalid pointer");
2556 return false;
2557 }
2558 else if (!block->isSameRange(addr, size)) {
2559 if (block->getType() == ShmBkBlock::MMAP) {
2560 // Release only the same range or a the beginning or the end of a range.
2561 if (block->base() == addr && size < block->size()) {
2562 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size));
2563 assert(b, "");
2564 shmbk_register(b);
2565 block->setAddrRange(AddrRange(addr, size));
2566 }
2567 else if (addr > block->base() && addr + size == block->base() + block->size()) {
2568 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size));
2569 assert(b, "");
2570 shmbk_register(b);
2571 block->setAddrRange(AddrRange(addr, size));
2572 }
2573 else {
2574 fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size);
2575 shmbk_dump_info();
2576 assert(false, "invalid mmap range");
2577 return false;
2578 }
2579 }
2580 else {
2581 // Release only the same range. No partial release allowed.
2582 // Soften the requirement a bit, because the user may think he owns a smaller size
2583 // than the block is due to alignment etc.
2584 if (block->base() != addr || block->size() < size) {
2585 fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size);
2586 shmbk_dump_info();
2587 assert(false, "invalid shmget range");
2588 return false;
2589 }
2590 }
2591 }
2592 rc = block->release();
2593 assert(rc, "release failed");
2594 // remove block from bookkeeping
2595 shmbk_unregister(block);
2596 delete block;
2597 UNLOCK_SHMBK
2598
2599 if (!rc) {
2600 warning("failed to released %lu bytes at 0x%p", size, addr);
2601 }
2602
2603 return rc;
2604 }
2605
2606 static bool checked_mprotect(char* addr, size_t size, int prot) {
2607
2608 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2609 // not tell me if protection failed when trying to protect an un-protectable range.
2610 //
2611 // This means if the memory was allocated using shmget/shmat, protection wont work
2612 // but mprotect will still return 0:
2613 //
2614 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2615
2616 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2617
2618 if (!rc) {
2619 const char* const s_errno = strerror(errno);
2620 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2621 return false;
2622 }
2623
2624 // mprotect success check
2625 //
2626 // Mprotect said it changed the protection but can I believe it?
2627 //
2628 // To be sure I need to check the protection afterwards. Try to
2629 // read from protected memory and check whether that causes a segfault.
2630 //
2631 if (!os::Aix::xpg_sus_mode()) {
2632
2633 if (StubRoutines::SafeFetch32_stub()) {
2634
2635 const bool read_protected =
2636 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2637 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2638
2639 if (prot & PROT_READ) {
2640 rc = !read_protected;
2641 } else {
2642 rc = read_protected;
2643 }
2644 }
2645 }
2646 if (!rc) {
2647 assert(false, "mprotect failed.");
2648 }
2649 return rc;
2650 }
2651
2652 // Set protections specified
2653 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2654 unsigned int p = 0;
2655 switch (prot) {
2656 case MEM_PROT_NONE: p = PROT_NONE; break;
2657 case MEM_PROT_READ: p = PROT_READ; break;
2658 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2659 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2660 default:
2661 ShouldNotReachHere();
2662 }
2663 // is_committed is unused.
2664 return checked_mprotect(addr, size, p);
2665 }
2666
2667 bool os::guard_memory(char* addr, size_t size) {
2668 return checked_mprotect(addr, size, PROT_NONE);
2669 }
2670
2671 bool os::unguard_memory(char* addr, size_t size) {
2672 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2673 }
2674
2675 // Large page support
2676
2677 static size_t _large_page_size = 0;
2678
2679 // Enable large page support if OS allows that.
2680 void os::large_page_init() {
2681
2682 // Note: os::Aix::query_multipage_support must run first.
2683
2684 if (!UseLargePages) {
2685 return;
2686 }
2687
2688 if (!Aix::can_use_64K_pages()) {
2689 assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M.");
2690 UseLargePages = false;
2691 return;
2692 }
2693
2694 if (!Aix::can_use_16M_pages() && Use16MPages) {
2695 fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool "
2696 " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n");
2697 }
2698
2699 // Do not report 16M page alignment as part of os::_page_sizes if we are
2700 // explicitly forbidden from using 16M pages. Doing so would increase the
2701 // alignment the garbage collector calculates with, slightly increasing
2702 // heap usage. We should only pay for 16M alignment if we really want to
2703 // use 16M pages.
2704 if (Use16MPages && Aix::can_use_16M_pages()) {
2705 _large_page_size = SIZE_16M;
2706 _page_sizes[0] = SIZE_16M;
2707 _page_sizes[1] = SIZE_64K;
2708 _page_sizes[2] = SIZE_4K;
2709 _page_sizes[3] = 0;
2710 } else if (Aix::can_use_64K_pages()) {
2711 _large_page_size = SIZE_64K;
2712 _page_sizes[0] = SIZE_64K;
2713 _page_sizes[1] = SIZE_4K;
2714 _page_sizes[2] = 0;
2715 }
2716
2717 if (Verbose) {
2718 ("Default large page size is 0x%llX.", _large_page_size);
2719 }
2720 } // end: os::large_page_init()
2721
2722 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2723 // "exec" is passed in but not used. Creating the shared image for
2724 // the code cache doesn't have an SHM_X executable permission to check.
2725 Unimplemented();
2726 return 0;
2727 }
2728
2729 bool os::release_memory_special(char* base, size_t bytes) {
2730 // detaching the SHM segment will also delete it, see reserve_memory_special()
2731 Unimplemented();
2732 return false;
2733 }
2734
2735 size_t os::large_page_size() {
2736 return _large_page_size;
2737 }
2738
2739 bool os::can_commit_large_page_memory() {
2740 // Well, sadly we cannot commit anything at all (see comment in
2741 // os::commit_memory) but we claim to so we can make use of large pages
2742 return true;
2743 }
2744
2745 bool os::can_execute_large_page_memory() {
2746 // We can do that
2747 return true;
2748 }
2749
2750 // Reserve memory at an arbitrary address, only if that area is
2751 // available (and not reserved for something else).
2752 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2753
2754 bool use_mmap = false;
2755
2756 // mmap: smaller graining, no large page support
2757 // shm: large graining (256M), large page support, limited number of shm segments
2758 //
2759 // Prefer mmap wherever we either do not need large page support or have OS limits
2760
2761 if (!UseLargePages || bytes < SIZE_16M) {
2762 use_mmap = true;
2763 }
2764
2765 char* addr = NULL;
2766 if (use_mmap) {
2767 addr = reserve_mmaped_memory(bytes, requested_addr);
2768 } else {
2769 // shmat: wish address is mandatory, and do not try 16M pages here.
2770 shmatted_memory_info_t info;
2771 const int flags = RESSHM_WISHADDR_OR_FAIL;
2772 if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) {
2773 addr = info.addr;
2774 }
2775 }
2776
2777 return addr;
2778 }
2779
2780 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2781 return ::read(fd, buf, nBytes);
2782 }
2783
2784 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2785 return ::pread(fd, buf, nBytes, offset);
2786 }
2787
2788 void os::naked_short_sleep(jlong ms) {
2789 struct timespec req;
2790
2791 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2792 req.tv_sec = 0;
2793 if (ms > 0) {
2794 req.tv_nsec = (ms % 1000) * 1000000;
2795 }
2796 else {
2797 req.tv_nsec = 1;
2798 }
2799
2800 nanosleep(&req, NULL);
2801
2802 return;
2803 }
2804
2805 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2806 void os::infinite_sleep() {
2807 while (true) { // sleep forever ...
2808 ::sleep(100); // ... 100 seconds at a time
2809 }
2810 }
2811
2812 // Used to convert frequent JVM_Yield() to nops
2813 bool os::dont_yield() {
2814 return DontYieldALot;
2815 }
2816
2817 void os::naked_yield() {
2818 sched_yield();
2819 }
2820
2821 ////////////////////////////////////////////////////////////////////////////////
2822 // thread priority support
2823
2824 // From AIX manpage to pthread_setschedparam
2825 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2826 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2827 //
2828 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2829 // range from 40 to 80, where 40 is the least favored priority and 80
2830 // is the most favored."
2831 //
2832 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2833 // scheduling there; however, this still leaves iSeries.)
2834 //
2835 // We use the same values for AIX and PASE.
2836 int os::java_to_os_priority[CriticalPriority + 1] = {
2837 54, // 0 Entry should never be used
2838
2839 55, // 1 MinPriority
2840 55, // 2
2841 56, // 3
2842
2843 56, // 4
2844 57, // 5 NormPriority
2845 57, // 6
2846
2847 58, // 7
2848 58, // 8
2849 59, // 9 NearMaxPriority
2850
2851 60, // 10 MaxPriority
2852
2853 60 // 11 CriticalPriority
2854 };
2855
2856 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2857 if (!UseThreadPriorities) return OS_OK;
2858 pthread_t thr = thread->osthread()->pthread_id();
2859 int policy = SCHED_OTHER;
2860 struct sched_param param;
2861 param.sched_priority = newpri;
2862 int ret = pthread_setschedparam(thr, policy, ¶m);
2863
2864 if (Verbose) {
2865 if (ret == 0) {
2866 fprintf(stderr, "changed priority of thread %d to %d\n", (int)thr, newpri);
2867 } else {
2868 fprintf(stderr, "Could not changed priority for thread %d to %d (error %d, %s)\n",
2869 (int)thr, newpri, ret, strerror(ret));
2870 }
2871 }
2872 return (ret == 0) ? OS_OK : OS_ERR;
2873 }
2874
2875 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2876 if (!UseThreadPriorities) {
2877 *priority_ptr = java_to_os_priority[NormPriority];
2878 return OS_OK;
2879 }
2880 pthread_t thr = thread->osthread()->pthread_id();
2881 int policy = SCHED_OTHER;
2882 struct sched_param param;
2883 int ret = pthread_getschedparam(thr, &policy, ¶m);
2884 *priority_ptr = param.sched_priority;
2885
2886 return (ret == 0) ? OS_OK : OS_ERR;
2887 }
2888
2889 // Hint to the underlying OS that a task switch would not be good.
2890 // Void return because it's a hint and can fail.
2891 void os::hint_no_preempt() {}
2892
2893 ////////////////////////////////////////////////////////////////////////////////
2894 // suspend/resume support
2895
2896 // the low-level signal-based suspend/resume support is a remnant from the
2897 // old VM-suspension that used to be for java-suspension, safepoints etc,
2898 // within hotspot. Now there is a single use-case for this:
2899 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2900 // that runs in the watcher thread.
2901 // The remaining code is greatly simplified from the more general suspension
2902 // code that used to be used.
2903 //
2904 // The protocol is quite simple:
2905 // - suspend:
2906 // - sends a signal to the target thread
2907 // - polls the suspend state of the osthread using a yield loop
2908 // - target thread signal handler (SR_handler) sets suspend state
2909 // and blocks in sigsuspend until continued
2910 // - resume:
2911 // - sets target osthread state to continue
2912 // - sends signal to end the sigsuspend loop in the SR_handler
2913 //
2914 // Note that the SR_lock plays no role in this suspend/resume protocol.
2915 //
2916
2917 static void resume_clear_context(OSThread *osthread) {
2918 osthread->set_ucontext(NULL);
2919 osthread->set_siginfo(NULL);
2920 }
2921
2922 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2923 osthread->set_ucontext(context);
2924 osthread->set_siginfo(siginfo);
2925 }
2926
2927 //
2928 // Handler function invoked when a thread's execution is suspended or
2929 // resumed. We have to be careful that only async-safe functions are
2930 // called here (Note: most pthread functions are not async safe and
2931 // should be avoided.)
2932 //
2933 // Note: sigwait() is a more natural fit than sigsuspend() from an
2934 // interface point of view, but sigwait() prevents the signal hander
2935 // from being run. libpthread would get very confused by not having
2936 // its signal handlers run and prevents sigwait()'s use with the
2937 // mutex granting granting signal.
2938 //
2939 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2940 //
2941 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2942 // Save and restore errno to avoid confusing native code with EINTR
2943 // after sigsuspend.
2944 int old_errno = errno;
2945
2946 Thread* thread = Thread::current();
2947 OSThread* osthread = thread->osthread();
2948 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2949
2950 os::SuspendResume::State current = osthread->sr.state();
2951 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2952 suspend_save_context(osthread, siginfo, context);
2953
2954 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2955 os::SuspendResume::State state = osthread->sr.suspended();
2956 if (state == os::SuspendResume::SR_SUSPENDED) {
2957 sigset_t suspend_set; // signals for sigsuspend()
2958
2959 // get current set of blocked signals and unblock resume signal
2960 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2961 sigdelset(&suspend_set, SR_signum);
2962
2963 // wait here until we are resumed
2964 while (1) {
2965 sigsuspend(&suspend_set);
2966
2967 os::SuspendResume::State result = osthread->sr.running();
2968 if (result == os::SuspendResume::SR_RUNNING) {
2969 break;
2970 }
2971 }
2972
2973 } else if (state == os::SuspendResume::SR_RUNNING) {
2974 // request was cancelled, continue
2975 } else {
2976 ShouldNotReachHere();
2977 }
2978
2979 resume_clear_context(osthread);
2980 } else if (current == os::SuspendResume::SR_RUNNING) {
2981 // request was cancelled, continue
2982 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2983 // ignore
2984 } else {
2985 ShouldNotReachHere();
2986 }
2987
2988 errno = old_errno;
2989 }
2990
2991
2992 static int SR_initialize() {
2993 struct sigaction act;
2994 char *s;
2995 // Get signal number to use for suspend/resume
2996 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2997 int sig = ::strtol(s, 0, 10);
2998 if (sig > 0 || sig < NSIG) {
2999 SR_signum = sig;
3000 }
3001 }
3002
3003 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
3004 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
3005
3006 sigemptyset(&SR_sigset);
3007 sigaddset(&SR_sigset, SR_signum);
3008
3009 // Set up signal handler for suspend/resume.
3010 act.sa_flags = SA_RESTART|SA_SIGINFO;
3011 act.sa_handler = (void (*)(int)) SR_handler;
3012
3013 // SR_signum is blocked by default.
3014 // 4528190 - We also need to block pthread restart signal (32 on all
3015 // supported Linux platforms). Note that LinuxThreads need to block
3016 // this signal for all threads to work properly. So we don't have
3017 // to use hard-coded signal number when setting up the mask.
3018 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
3019
3020 if (sigaction(SR_signum, &act, 0) == -1) {
3021 return -1;
3022 }
3023
3024 // Save signal flag
3025 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
3026 return 0;
3027 }
3028
3029 static int SR_finalize() {
3030 return 0;
3031 }
3032
3033 static int sr_notify(OSThread* osthread) {
3034 int status = pthread_kill(osthread->pthread_id(), SR_signum);
3035 assert_status(status == 0, status, "pthread_kill");
3036 return status;
3037 }
3038
3039 // "Randomly" selected value for how long we want to spin
3040 // before bailing out on suspending a thread, also how often
3041 // we send a signal to a thread we want to resume
3042 static const int RANDOMLY_LARGE_INTEGER = 1000000;
3043 static const int RANDOMLY_LARGE_INTEGER2 = 100;
3044
3045 // returns true on success and false on error - really an error is fatal
3046 // but this seems the normal response to library errors
3047 static bool do_suspend(OSThread* osthread) {
3048 assert(osthread->sr.is_running(), "thread should be running");
3049 // mark as suspended and send signal
3050
3051 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
3052 // failed to switch, state wasn't running?
3053 ShouldNotReachHere();
3054 return false;
3055 }
3056
3057 if (sr_notify(osthread) != 0) {
3058 // try to cancel, switch to running
3059
3060 os::SuspendResume::State result = osthread->sr.cancel_suspend();
3061 if (result == os::SuspendResume::SR_RUNNING) {
3062 // cancelled
3063 return false;
3064 } else if (result == os::SuspendResume::SR_SUSPENDED) {
3065 // somehow managed to suspend
3066 return true;
3067 } else {
3068 ShouldNotReachHere();
3069 return false;
3070 }
3071 }
3072
3073 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
3074
3075 for (int n = 0; !osthread->sr.is_suspended(); n++) {
3076 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
3077 os::naked_yield();
3078 }
3079
3080 // timeout, try to cancel the request
3081 if (n >= RANDOMLY_LARGE_INTEGER) {
3082 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
3083 if (cancelled == os::SuspendResume::SR_RUNNING) {
3084 return false;
3085 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
3086 return true;
3087 } else {
3088 ShouldNotReachHere();
3089 return false;
3090 }
3091 }
3092 }
3093
3094 guarantee(osthread->sr.is_suspended(), "Must be suspended");
3095 return true;
3096 }
3097
3098 static void do_resume(OSThread* osthread) {
3099 //assert(osthread->sr.is_suspended(), "thread should be suspended");
3100
3101 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
3102 // failed to switch to WAKEUP_REQUEST
3103 ShouldNotReachHere();
3104 return;
3105 }
3106
3107 while (!osthread->sr.is_running()) {
3108 if (sr_notify(osthread) == 0) {
3109 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
3110 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
3111 os::naked_yield();
3112 }
3113 }
3114 } else {
3115 ShouldNotReachHere();
3116 }
3117 }
3118
3119 guarantee(osthread->sr.is_running(), "Must be running!");
3120 }
3121
3122 ///////////////////////////////////////////////////////////////////////////////////
3123 // signal handling (except suspend/resume)
3124
3125 // This routine may be used by user applications as a "hook" to catch signals.
3126 // The user-defined signal handler must pass unrecognized signals to this
3127 // routine, and if it returns true (non-zero), then the signal handler must
3128 // return immediately. If the flag "abort_if_unrecognized" is true, then this
3129 // routine will never retun false (zero), but instead will execute a VM panic
3130 // routine kill the process.
3131 //
3132 // If this routine returns false, it is OK to call it again. This allows
3133 // the user-defined signal handler to perform checks either before or after
3134 // the VM performs its own checks. Naturally, the user code would be making
3135 // a serious error if it tried to handle an exception (such as a null check
3136 // or breakpoint) that the VM was generating for its own correct operation.
3137 //
3138 // This routine may recognize any of the following kinds of signals:
3139 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
3140 // It should be consulted by handlers for any of those signals.
3141 //
3142 // The caller of this routine must pass in the three arguments supplied
3143 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3144 // field of the structure passed to sigaction(). This routine assumes that
3145 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3146 //
3147 // Note that the VM will print warnings if it detects conflicting signal
3148 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3149 //
3150 extern "C" JNIEXPORT int
3151 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
3152
3153 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3154 // to be the thing to call; documentation is not terribly clear about whether
3155 // pthread_sigmask also works, and if it does, whether it does the same.
3156 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3157 const int rc = ::pthread_sigmask(how, set, oset);
3158 // return value semantics differ slightly for error case:
3159 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3160 // (so, pthread_sigmask is more theadsafe for error handling)
3161 // But success is always 0.
3162 return rc == 0 ? true : false;
3163 }
3164
3165 // Function to unblock all signals which are, according
3166 // to POSIX, typical program error signals. If they happen while being blocked,
3167 // they typically will bring down the process immediately.
3168 bool unblock_program_error_signals() {
3169 sigset_t set;
3170 ::sigemptyset(&set);
3171 ::sigaddset(&set, SIGILL);
3172 ::sigaddset(&set, SIGBUS);
3173 ::sigaddset(&set, SIGFPE);
3174 ::sigaddset(&set, SIGSEGV);
3175 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3176 }
3177
3178 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3179 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3180 assert(info != NULL && uc != NULL, "it must be old kernel");
3181
3182 // Never leave program error signals blocked;
3183 // on all our platforms they would bring down the process immediately when
3184 // getting raised while being blocked.
3185 unblock_program_error_signals();
3186
3187 JVM_handle_aix_signal(sig, info, uc, true);
3188 }
3189
3190
3191 // This boolean allows users to forward their own non-matching signals
3192 // to JVM_handle_aix_signal, harmlessly.
3193 bool os::Aix::signal_handlers_are_installed = false;
3194
3195 // For signal-chaining
3196 struct sigaction os::Aix::sigact[MAXSIGNUM];
3197 unsigned int os::Aix::sigs = 0;
3198 bool os::Aix::libjsig_is_loaded = false;
3199 typedef struct sigaction *(*get_signal_t)(int);
3200 get_signal_t os::Aix::get_signal_action = NULL;
3201
3202 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3203 struct sigaction *actp = NULL;
3204
3205 if (libjsig_is_loaded) {
3206 // Retrieve the old signal handler from libjsig
3207 actp = (*get_signal_action)(sig);
3208 }
3209 if (actp == NULL) {
3210 // Retrieve the preinstalled signal handler from jvm
3211 actp = get_preinstalled_handler(sig);
3212 }
3213
3214 return actp;
3215 }
3216
3217 static bool call_chained_handler(struct sigaction *actp, int sig,
3218 siginfo_t *siginfo, void *context) {
3219 // Call the old signal handler
3220 if (actp->sa_handler == SIG_DFL) {
3221 // It's more reasonable to let jvm treat it as an unexpected exception
3222 // instead of taking the default action.
3223 return false;
3224 } else if (actp->sa_handler != SIG_IGN) {
3225 if ((actp->sa_flags & SA_NODEFER) == 0) {
3226 // automaticlly block the signal
3227 sigaddset(&(actp->sa_mask), sig);
3228 }
3229
3230 sa_handler_t hand = NULL;
3231 sa_sigaction_t sa = NULL;
3232 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3233 // retrieve the chained handler
3234 if (siginfo_flag_set) {
3235 sa = actp->sa_sigaction;
3236 } else {
3237 hand = actp->sa_handler;
3238 }
3239
3240 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3241 actp->sa_handler = SIG_DFL;
3242 }
3243
3244 // try to honor the signal mask
3245 sigset_t oset;
3246 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3247
3248 // call into the chained handler
3249 if (siginfo_flag_set) {
3250 (*sa)(sig, siginfo, context);
3251 } else {
3252 (*hand)(sig);
3253 }
3254
3255 // restore the signal mask
3256 pthread_sigmask(SIG_SETMASK, &oset, 0);
3257 }
3258 // Tell jvm's signal handler the signal is taken care of.
3259 return true;
3260 }
3261
3262 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3263 bool chained = false;
3264 // signal-chaining
3265 if (UseSignalChaining) {
3266 struct sigaction *actp = get_chained_signal_action(sig);
3267 if (actp != NULL) {
3268 chained = call_chained_handler(actp, sig, siginfo, context);
3269 }
3270 }
3271 return chained;
3272 }
3273
3274 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3275 if ((((unsigned int)1 << sig) & sigs) != 0) {
3276 return &sigact[sig];
3277 }
3278 return NULL;
3279 }
3280
3281 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3282 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3283 sigact[sig] = oldAct;
3284 sigs |= (unsigned int)1 << sig;
3285 }
3286
3287 // for diagnostic
3288 int os::Aix::sigflags[MAXSIGNUM];
3289
3290 int os::Aix::get_our_sigflags(int sig) {
3291 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3292 return sigflags[sig];
3293 }
3294
3295 void os::Aix::set_our_sigflags(int sig, int flags) {
3296 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3297 sigflags[sig] = flags;
3298 }
3299
3300 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3301 // Check for overwrite.
3302 struct sigaction oldAct;
3303 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3304
3305 void* oldhand = oldAct.sa_sigaction
3306 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3307 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3308 // Renamed 'signalHandler' to avoid collision with other shared libs.
3309 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3310 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3311 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3312 if (AllowUserSignalHandlers || !set_installed) {
3313 // Do not overwrite; user takes responsibility to forward to us.
3314 return;
3315 } else if (UseSignalChaining) {
3316 // save the old handler in jvm
3317 save_preinstalled_handler(sig, oldAct);
3318 // libjsig also interposes the sigaction() call below and saves the
3319 // old sigaction on it own.
3320 } else {
3321 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3322 "%#lx for signal %d.", (long)oldhand, sig));
3323 }
3324 }
3325
3326 struct sigaction sigAct;
3327 sigfillset(&(sigAct.sa_mask));
3328 if (!set_installed) {
3329 sigAct.sa_handler = SIG_DFL;
3330 sigAct.sa_flags = SA_RESTART;
3331 } else {
3332 // Renamed 'signalHandler' to avoid collision with other shared libs.
3333 sigAct.sa_sigaction = javaSignalHandler;
3334 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3335 }
3336 // Save flags, which are set by ours
3337 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3338 sigflags[sig] = sigAct.sa_flags;
3339
3340 int ret = sigaction(sig, &sigAct, &oldAct);
3341 assert(ret == 0, "check");
3342
3343 void* oldhand2 = oldAct.sa_sigaction
3344 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3345 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3346 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3347 }
3348
3349 // install signal handlers for signals that HotSpot needs to
3350 // handle in order to support Java-level exception handling.
3351 void os::Aix::install_signal_handlers() {
3352 if (!signal_handlers_are_installed) {
3353 signal_handlers_are_installed = true;
3354
3355 // signal-chaining
3356 typedef void (*signal_setting_t)();
3357 signal_setting_t begin_signal_setting = NULL;
3358 signal_setting_t end_signal_setting = NULL;
3359 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3360 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3361 if (begin_signal_setting != NULL) {
3362 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3363 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3364 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3365 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3366 libjsig_is_loaded = true;
3367 assert(UseSignalChaining, "should enable signal-chaining");
3368 }
3369 if (libjsig_is_loaded) {
3370 // Tell libjsig jvm is setting signal handlers
3371 (*begin_signal_setting)();
3372 }
3373
3374 set_signal_handler(SIGSEGV, true);
3375 set_signal_handler(SIGPIPE, true);
3376 set_signal_handler(SIGBUS, true);
3377 set_signal_handler(SIGILL, true);
3378 set_signal_handler(SIGFPE, true);
3379 set_signal_handler(SIGTRAP, true);
3380 set_signal_handler(SIGXFSZ, true);
3381 set_signal_handler(SIGDANGER, true);
3382
3383 if (libjsig_is_loaded) {
3384 // Tell libjsig jvm finishes setting signal handlers
3385 (*end_signal_setting)();
3386 }
3387
3388 // We don't activate signal checker if libjsig is in place, we trust ourselves
3389 // and if UserSignalHandler is installed all bets are off.
3390 // Log that signal checking is off only if -verbose:jni is specified.
3391 if (CheckJNICalls) {
3392 if (libjsig_is_loaded) {
3393 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3394 check_signals = false;
3395 }
3396 if (AllowUserSignalHandlers) {
3397 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3398 check_signals = false;
3399 }
3400 // need to initialize check_signal_done
3401 ::sigemptyset(&check_signal_done);
3402 }
3403 }
3404 }
3405
3406 static const char* get_signal_handler_name(address handler,
3407 char* buf, int buflen) {
3408 int offset;
3409 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3410 if (found) {
3411 // skip directory names
3412 const char *p1, *p2;
3413 p1 = buf;
3414 size_t len = strlen(os::file_separator());
3415 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3416 // The way os::dll_address_to_library_name is implemented on Aix
3417 // right now, it always returns -1 for the offset which is not
3418 // terribly informative.
3419 // Will fix that. For now, omit the offset.
3420 jio_snprintf(buf, buflen, "%s", p1);
3421 } else {
3422 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3423 }
3424 return buf;
3425 }
3426
3427 static void print_signal_handler(outputStream* st, int sig,
3428 char* buf, size_t buflen) {
3429 struct sigaction sa;
3430 sigaction(sig, NULL, &sa);
3431
3432 st->print("%s: ", os::exception_name(sig, buf, buflen));
3433
3434 address handler = (sa.sa_flags & SA_SIGINFO)
3435 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3436 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3437
3438 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3439 st->print("SIG_DFL");
3440 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3441 st->print("SIG_IGN");
3442 } else {
3443 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3444 }
3445
3446 // Print readable mask.
3447 st->print(", sa_mask[0]=");
3448 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3449
3450 address rh = VMError::get_resetted_sighandler(sig);
3451 // May be, handler was resetted by VMError?
3452 if (rh != NULL) {
3453 handler = rh;
3454 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3455 }
3456
3457 // Print textual representation of sa_flags.
3458 st->print(", sa_flags=");
3459 os::Posix::print_sa_flags(st, sa.sa_flags);
3460
3461 // Check: is it our handler?
3462 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3463 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3464 // It is our signal handler.
3465 // Check for flags, reset system-used one!
3466 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3467 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3468 os::Aix::get_our_sigflags(sig));
3469 }
3470 }
3471 st->cr();
3472 }
3473
3474
3475 #define DO_SIGNAL_CHECK(sig) \
3476 if (!sigismember(&check_signal_done, sig)) \
3477 os::Aix::check_signal_handler(sig)
3478
3479 // This method is a periodic task to check for misbehaving JNI applications
3480 // under CheckJNI, we can add any periodic checks here
3481
3482 void os::run_periodic_checks() {
3483
3484 if (check_signals == false) return;
3485
3486 // SEGV and BUS if overridden could potentially prevent
3487 // generation of hs*.log in the event of a crash, debugging
3488 // such a case can be very challenging, so we absolutely
3489 // check the following for a good measure:
3490 DO_SIGNAL_CHECK(SIGSEGV);
3491 DO_SIGNAL_CHECK(SIGILL);
3492 DO_SIGNAL_CHECK(SIGFPE);
3493 DO_SIGNAL_CHECK(SIGBUS);
3494 DO_SIGNAL_CHECK(SIGPIPE);
3495 DO_SIGNAL_CHECK(SIGXFSZ);
3496 if (UseSIGTRAP) {
3497 DO_SIGNAL_CHECK(SIGTRAP);
3498 }
3499 DO_SIGNAL_CHECK(SIGDANGER);
3500
3501 // ReduceSignalUsage allows the user to override these handlers
3502 // see comments at the very top and jvm_solaris.h
3503 if (!ReduceSignalUsage) {
3504 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3505 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3506 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3507 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3508 }
3509
3510 DO_SIGNAL_CHECK(SR_signum);
3511 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3512 }
3513
3514 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3515
3516 static os_sigaction_t os_sigaction = NULL;
3517
3518 void os::Aix::check_signal_handler(int sig) {
3519 char buf[O_BUFLEN];
3520 address jvmHandler = NULL;
3521
3522 struct sigaction act;
3523 if (os_sigaction == NULL) {
3524 // only trust the default sigaction, in case it has been interposed
3525 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3526 if (os_sigaction == NULL) return;
3527 }
3528
3529 os_sigaction(sig, (struct sigaction*)NULL, &act);
3530
3531 address thisHandler = (act.sa_flags & SA_SIGINFO)
3532 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3533 : CAST_FROM_FN_PTR(address, act.sa_handler);
3534
3535
3536 switch(sig) {
3537 case SIGSEGV:
3538 case SIGBUS:
3539 case SIGFPE:
3540 case SIGPIPE:
3541 case SIGILL:
3542 case SIGXFSZ:
3543 // Renamed 'signalHandler' to avoid collision with other shared libs.
3544 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3545 break;
3546
3547 case SHUTDOWN1_SIGNAL:
3548 case SHUTDOWN2_SIGNAL:
3549 case SHUTDOWN3_SIGNAL:
3550 case BREAK_SIGNAL:
3551 jvmHandler = (address)user_handler();
3552 break;
3553
3554 case INTERRUPT_SIGNAL:
3555 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3556 break;
3557
3558 default:
3559 if (sig == SR_signum) {
3560 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3561 } else {
3562 return;
3563 }
3564 break;
3565 }
3566
3567 if (thisHandler != jvmHandler) {
3568 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3569 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3570 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3571 // No need to check this sig any longer
3572 sigaddset(&check_signal_done, sig);
3573 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3574 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3575 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3576 exception_name(sig, buf, O_BUFLEN));
3577 }
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 // Mark the polling page as unreadable
3841 void os::make_polling_page_unreadable(void) {
3842 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3843 fatal("Could not disable polling page");
3844 }
3845 };
3846
3847 // Mark the polling page as readable
3848 void os::make_polling_page_readable(void) {
3849 // Changed according to os_linux.cpp.
3850 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3851 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
3852 }
3853 };
3854
3855 int os::active_processor_count() {
3856 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3857 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3858 return online_cpus;
3859 }
3860
3861 void os::set_native_thread_name(const char *name) {
3862 // Not yet implemented.
3863 return;
3864 }
3865
3866 bool os::distribute_processes(uint length, uint* distribution) {
3867 // Not yet implemented.
3868 return false;
3869 }
3870
3871 bool os::bind_to_processor(uint processor_id) {
3872 // Not yet implemented.
3873 return false;
3874 }
3875
3876 void os::SuspendedThreadTask::internal_do_task() {
3877 if (do_suspend(_thread->osthread())) {
3878 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3879 do_task(context);
3880 do_resume(_thread->osthread());
3881 }
3882 }
3883
3884 class PcFetcher : public os::SuspendedThreadTask {
3885 public:
3886 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3887 ExtendedPC result();
3888 protected:
3889 void do_task(const os::SuspendedThreadTaskContext& context);
3890 private:
3891 ExtendedPC _epc;
3892 };
3893
3894 ExtendedPC PcFetcher::result() {
3895 guarantee(is_done(), "task is not done yet.");
3896 return _epc;
3897 }
3898
3899 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3900 Thread* thread = context.thread();
3901 OSThread* osthread = thread->osthread();
3902 if (osthread->ucontext() != NULL) {
3903 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3904 } else {
3905 // NULL context is unexpected, double-check this is the VMThread.
3906 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3907 }
3908 }
3909
3910 // Suspends the target using the signal mechanism and then grabs the PC before
3911 // resuming the target. Used by the flat-profiler only
3912 ExtendedPC os::get_thread_pc(Thread* thread) {
3913 // Make sure that it is called by the watcher for the VMThread.
3914 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3915 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3916
3917 PcFetcher fetcher(thread);
3918 fetcher.run();
3919 return fetcher.result();
3920 }
3921
3922 // Not neede on Aix.
3923 // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) {
3924 // }
3925
3926 ////////////////////////////////////////////////////////////////////////////////
3927 // debug support
3928
3929 static address same_page(address x, address y) {
3930 intptr_t page_bits = -os::vm_page_size();
3931 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3932 return x;
3933 else if (x > y)
3934 return (address)(intptr_t(y) | ~page_bits) + 1;
3935 else
3936 return (address)(intptr_t(y) & page_bits);
3937 }
3938
3939 bool os::find(address addr, outputStream* st) {
3940
3941 st->print(PTR_FORMAT ": ", addr);
3942
3943 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3944 if (lib) {
3945 lib->print(st);
3946 return true;
3947 } else {
3948 lib = LoadedLibraries::find_for_data_address(addr);
3949 if (lib) {
3950 lib->print(st);
3951 return true;
3952 } else {
3953 st->print_cr("(outside any module)");
3954 }
3955 }
3956
3957 return false;
3958 }
3959
3960 ////////////////////////////////////////////////////////////////////////////////
3961 // misc
3962
3963 // This does not do anything on Aix. This is basically a hook for being
3964 // able to use structured exception handling (thread-local exception filters)
3965 // on, e.g., Win32.
3966 void
3967 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3968 JavaCallArguments* args, Thread* thread) {
3969 f(value, method, args, thread);
3970 }
3971
3972 void os::print_statistics() {
3973 }
3974
3975 int os::message_box(const char* title, const char* message) {
3976 int i;
3977 fdStream err(defaultStream::error_fd());
3978 for (i = 0; i < 78; i++) err.print_raw("=");
3979 err.cr();
3980 err.print_raw_cr(title);
3981 for (i = 0; i < 78; i++) err.print_raw("-");
3982 err.cr();
3983 err.print_raw_cr(message);
3984 for (i = 0; i < 78; i++) err.print_raw("=");
3985 err.cr();
3986
3987 char buf[16];
3988 // Prevent process from exiting upon "read error" without consuming all CPU
3989 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3990
3991 return buf[0] == 'y' || buf[0] == 'Y';
3992 }
3993
3994 int os::stat(const char *path, struct stat *sbuf) {
3995 char pathbuf[MAX_PATH];
3996 if (strlen(path) > MAX_PATH - 1) {
3997 errno = ENAMETOOLONG;
3998 return -1;
3999 }
4000 os::native_path(strcpy(pathbuf, path));
4001 return ::stat(pathbuf, sbuf);
4002 }
4003
4004 bool os::check_heap(bool force) {
4005 return true;
4006 }
4007
4008 // Is a (classpath) directory empty?
4009 bool os::dir_is_empty(const char* path) {
4010 DIR *dir = NULL;
4011 struct dirent *ptr;
4012
4013 dir = opendir(path);
4014 if (dir == NULL) return true;
4015
4016 /* Scan the directory */
4017 bool result = true;
4018 char buf[sizeof(struct dirent) + MAX_PATH];
4019 while (result && (ptr = ::readdir(dir)) != NULL) {
4020 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
4021 result = false;
4022 }
4023 }
4024 closedir(dir);
4025 return result;
4026 }
4027
4028 // This code originates from JDK's sysOpen and open64_w
4029 // from src/solaris/hpi/src/system_md.c
4030
4031 int os::open(const char *path, int oflag, int mode) {
4032
4033 if (strlen(path) > MAX_PATH - 1) {
4034 errno = ENAMETOOLONG;
4035 return -1;
4036 }
4037 int fd;
4038
4039 fd = ::open64(path, oflag, mode);
4040 if (fd == -1) return -1;
4041
4042 // If the open succeeded, the file might still be a directory.
4043 {
4044 struct stat64 buf64;
4045 int ret = ::fstat64(fd, &buf64);
4046 int st_mode = buf64.st_mode;
4047
4048 if (ret != -1) {
4049 if ((st_mode & S_IFMT) == S_IFDIR) {
4050 errno = EISDIR;
4051 ::close(fd);
4052 return -1;
4053 }
4054 } else {
4055 ::close(fd);
4056 return -1;
4057 }
4058 }
4059
4060 // All file descriptors that are opened in the JVM and not
4061 // specifically destined for a subprocess should have the
4062 // close-on-exec flag set. If we don't set it, then careless 3rd
4063 // party native code might fork and exec without closing all
4064 // appropriate file descriptors (e.g. as we do in closeDescriptors in
4065 // UNIXProcess.c), and this in turn might:
4066 //
4067 // - cause end-of-file to fail to be detected on some file
4068 // descriptors, resulting in mysterious hangs, or
4069 //
4070 // - might cause an fopen in the subprocess to fail on a system
4071 // suffering from bug 1085341.
4072 //
4073 // (Yes, the default setting of the close-on-exec flag is a Unix
4074 // design flaw.)
4075 //
4076 // See:
4077 // 1085341: 32-bit stdio routines should support file descriptors >255
4078 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
4079 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
4080 #ifdef FD_CLOEXEC
4081 {
4082 int flags = ::fcntl(fd, F_GETFD);
4083 if (flags != -1)
4084 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
4085 }
4086 #endif
4087
4088 return fd;
4089 }
4090
4091
4092 // create binary file, rewriting existing file if required
4093 int os::create_binary_file(const char* path, bool rewrite_existing) {
4094 int oflags = O_WRONLY | O_CREAT;
4095 if (!rewrite_existing) {
4096 oflags |= O_EXCL;
4097 }
4098 return ::open64(path, oflags, S_IREAD | S_IWRITE);
4099 }
4100
4101 // return current position of file pointer
4102 jlong os::current_file_offset(int fd) {
4103 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
4104 }
4105
4106 // move file pointer to the specified offset
4107 jlong os::seek_to_file_offset(int fd, jlong offset) {
4108 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
4109 }
4110
4111 // This code originates from JDK's sysAvailable
4112 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
4113
4114 int os::available(int fd, jlong *bytes) {
4115 jlong cur, end;
4116 int mode;
4117 struct stat64 buf64;
4118
4119 if (::fstat64(fd, &buf64) >= 0) {
4120 mode = buf64.st_mode;
4121 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
4122 // XXX: is the following call interruptible? If so, this might
4123 // need to go through the INTERRUPT_IO() wrapper as for other
4124 // blocking, interruptible calls in this file.
4125 int n;
4126 if (::ioctl(fd, FIONREAD, &n) >= 0) {
4127 *bytes = n;
4128 return 1;
4129 }
4130 }
4131 }
4132 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
4133 return 0;
4134 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
4135 return 0;
4136 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
4137 return 0;
4138 }
4139 *bytes = end - cur;
4140 return 1;
4141 }
4142
4143 // Map a block of memory.
4144 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4145 char *addr, size_t bytes, bool read_only,
4146 bool allow_exec) {
4147 Unimplemented();
4148 return NULL;
4149 }
4150
4151
4152 // Remap a block of memory.
4153 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4154 char *addr, size_t bytes, bool read_only,
4155 bool allow_exec) {
4156 // same as map_memory() on this OS
4157 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4158 allow_exec);
4159 }
4160
4161 // Unmap a block of memory.
4162 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4163 return munmap(addr, bytes) == 0;
4164 }
4165
4166 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4167 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4168 // of a thread.
4169 //
4170 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4171 // the fast estimate available on the platform.
4172
4173 jlong os::current_thread_cpu_time() {
4174 // return user + sys since the cost is the same
4175 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4176 assert(n >= 0, "negative CPU time");
4177 return n;
4178 }
4179
4180 jlong os::thread_cpu_time(Thread* thread) {
4181 // consistent with what current_thread_cpu_time() returns
4182 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4183 assert(n >= 0, "negative CPU time");
4184 return n;
4185 }
4186
4187 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4188 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4189 assert(n >= 0, "negative CPU time");
4190 return n;
4191 }
4192
4193 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4194 bool error = false;
4195
4196 jlong sys_time = 0;
4197 jlong user_time = 0;
4198
4199 // reimplemented using getthrds64().
4200 //
4201 // goes like this:
4202 // For the thread in question, get the kernel thread id. Then get the
4203 // kernel thread statistics using that id.
4204 //
4205 // This only works of course when no pthread scheduling is used,
4206 // ie there is a 1:1 relationship to kernel threads.
4207 // On AIX, see AIXTHREAD_SCOPE variable.
4208
4209 pthread_t pthtid = thread->osthread()->pthread_id();
4210
4211 // retrieve kernel thread id for the pthread:
4212 tid64_t tid = 0;
4213 struct __pthrdsinfo pinfo;
4214 // I just love those otherworldly IBM APIs which force me to hand down
4215 // dummy buffers for stuff I dont care for...
4216 char dummy[1];
4217 int dummy_size = sizeof(dummy);
4218 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4219 dummy, &dummy_size) == 0) {
4220 tid = pinfo.__pi_tid;
4221 } else {
4222 tty->print_cr("pthread_getthrds_np failed.");
4223 error = true;
4224 }
4225
4226 // retrieve kernel timing info for that kernel thread
4227 if (!error) {
4228 struct thrdentry64 thrdentry;
4229 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4230 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4231 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4232 } else {
4233 tty->print_cr("pthread_getthrds_np failed.");
4234 error = true;
4235 }
4236 }
4237
4238 if (p_sys_time) {
4239 *p_sys_time = sys_time;
4240 }
4241
4242 if (p_user_time) {
4243 *p_user_time = user_time;
4244 }
4245
4246 if (error) {
4247 return false;
4248 }
4249
4250 return true;
4251 }
4252
4253 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4254 jlong sys_time;
4255 jlong user_time;
4256
4257 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4258 return -1;
4259 }
4260
4261 return user_sys_cpu_time ? sys_time + user_time : user_time;
4262 }
4263
4264 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4265 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4266 info_ptr->may_skip_backward = false; // elapsed time not wall time
4267 info_ptr->may_skip_forward = false; // elapsed time not wall time
4268 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4269 }
4270
4271 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4272 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4273 info_ptr->may_skip_backward = false; // elapsed time not wall time
4274 info_ptr->may_skip_forward = false; // elapsed time not wall time
4275 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4276 }
4277
4278 bool os::is_thread_cpu_time_supported() {
4279 return true;
4280 }
4281
4282 // System loadavg support. Returns -1 if load average cannot be obtained.
4283 // For now just return the system wide load average (no processor sets).
4284 int os::loadavg(double values[], int nelem) {
4285
4286 // Implemented using libperfstat on AIX.
4287
4288 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4289 guarantee(values, "argument error");
4290
4291 if (os::Aix::on_pase()) {
4292 Unimplemented();
4293 return -1;
4294 } else {
4295 // AIX: use libperfstat
4296 //
4297 // See also:
4298 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4299 // /usr/include/libperfstat.h:
4300
4301 // Use the already AIX version independent get_cpuinfo.
4302 os::Aix::cpuinfo_t ci;
4303 if (os::Aix::get_cpuinfo(&ci)) {
4304 for (int i = 0; i < nelem; i++) {
4305 values[i] = ci.loadavg[i];
4306 }
4307 } else {
4308 return -1;
4309 }
4310 return nelem;
4311 }
4312 }
4313
4314 void os::pause() {
4315 char filename[MAX_PATH];
4316 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4317 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4318 } else {
4319 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4320 }
4321
4322 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4323 if (fd != -1) {
4324 struct stat buf;
4325 ::close(fd);
4326 while (::stat(filename, &buf) == 0) {
4327 (void)::poll(NULL, 0, 100);
4328 }
4329 } else {
4330 jio_fprintf(stderr,
4331 "Could not open pause file '%s', continuing immediately.\n", filename);
4332 }
4333 }
4334
4335 bool os::Aix::is_primordial_thread() {
4336 if (pthread_self() == (pthread_t)1) {
4337 return true;
4338 } else {
4339 return false;
4340 }
4341 }
4342
4343 // OS recognitions (PASE/AIX, OS level) call this before calling any
4344 // one of Aix::on_pase(), Aix::os_version() static
4345 void os::Aix::initialize_os_info() {
4346
4347 assert(_on_pase == -1 && _os_version == -1, "already called.");
4348
4349 struct utsname uts;
4350 memset(&uts, 0, sizeof(uts));
4351 strcpy(uts.sysname, "?");
4352 if (::uname(&uts) == -1) {
4353 fprintf(stderr, "uname failed (%d)\n", errno);
4354 guarantee(0, "Could not determine whether we run on AIX or PASE");
4355 } else {
4356 if (Verbose) {
4357 fprintf(stderr,"uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4358 "node \"%s\" machine \"%s\"\n",
4359 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4360 }
4361 const int major = atoi(uts.version);
4362 assert(major > 0, "invalid OS version");
4363 const int minor = atoi(uts.release);
4364 assert(minor > 0, "invalid OS release");
4365 _os_version = (major << 8) | minor;
4366 if (strcmp(uts.sysname, "OS400") == 0) {
4367 Unimplemented();
4368 } else if (strcmp(uts.sysname, "AIX") == 0) {
4369 // We run on AIX. We do not support versions older than AIX 5.3.
4370 _on_pase = 0;
4371 if (_os_version < 0x0503) {
4372 fprintf(stderr, "AIX release older than AIX 5.3 not supported.\n");
4373 assert(false, "AIX release too old.");
4374 } else {
4375 if (Verbose) {
4376 fprintf(stderr, "We run on AIX %d.%d\n", major, minor);
4377 }
4378 }
4379 } else {
4380 assert(false, "unknown OS");
4381 }
4382 }
4383
4384 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4385
4386 } // end: os::Aix::initialize_os_info()
4387
4388 // Scan environment for important settings which might effect the VM.
4389 // Trace out settings. Warn about invalid settings and/or correct them.
4390 //
4391 // Must run after os::Aix::initialue_os_info().
4392 void os::Aix::scan_environment() {
4393
4394 char* p;
4395 int rc;
4396
4397 // Warn explicity if EXTSHM=ON is used. That switch changes how
4398 // System V shared memory behaves. One effect is that page size of
4399 // shared memory cannot be change dynamically, effectivly preventing
4400 // large pages from working.
4401 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4402 // recommendation is (in OSS notes) to switch it off.
4403 p = ::getenv("EXTSHM");
4404 if (Verbose) {
4405 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4406 }
4407 if (p && strcmp(p, "ON") == 0) {
4408 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4409 _extshm = 1;
4410 } else {
4411 _extshm = 0;
4412 }
4413
4414 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4415 // Not tested, not supported.
4416 //
4417 // Note that it might be worth the trouble to test and to require it, if only to
4418 // get useful return codes for mprotect.
4419 //
4420 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4421 // exec() ? before loading the libjvm ? ....)
4422 p = ::getenv("XPG_SUS_ENV");
4423 if (Verbose) {
4424 fprintf(stderr, "XPG_SUS_ENV=%s.\n", p ? p : "<unset>");
4425 }
4426 if (p && strcmp(p, "ON") == 0) {
4427 _xpg_sus_mode = 1;
4428 fprintf(stderr, "Unsupported setting: XPG_SUS_ENV=ON\n");
4429 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4430 // clobber address ranges. If we ever want to support that, we have to do some
4431 // testing first.
4432 guarantee(false, "XPG_SUS_ENV=ON not supported");
4433 } else {
4434 _xpg_sus_mode = 0;
4435 }
4436
4437 // Switch off AIX internal (pthread) guard pages. This has
4438 // immediate effect for any pthread_create calls which follow.
4439 p = ::getenv("AIXTHREAD_GUARDPAGES");
4440 if (Verbose) {
4441 fprintf(stderr, "AIXTHREAD_GUARDPAGES=%s.\n", p ? p : "<unset>");
4442 fprintf(stderr, "setting AIXTHREAD_GUARDPAGES=0.\n");
4443 }
4444 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4445 guarantee(rc == 0, "");
4446
4447 } // end: os::Aix::scan_environment()
4448
4449 // PASE: initialize the libo4 library (AS400 PASE porting library).
4450 void os::Aix::initialize_libo4() {
4451 Unimplemented();
4452 }
4453
4454 // AIX: initialize the libperfstat library (we load this dynamically
4455 // because it is only available on AIX.
4456 void os::Aix::initialize_libperfstat() {
4457
4458 assert(os::Aix::on_aix(), "AIX only");
4459
4460 if (!libperfstat::init()) {
4461 fprintf(stderr, "libperfstat initialization failed.\n");
4462 assert(false, "libperfstat initialization failed");
4463 } else {
4464 if (Verbose) {
4465 fprintf(stderr, "libperfstat initialized.\n");
4466 }
4467 }
4468 } // end: os::Aix::initialize_libperfstat
4469
4470 /////////////////////////////////////////////////////////////////////////////
4471 // thread stack
4472
4473 // function to query the current stack size using pthread_getthrds_np
4474 //
4475 // ! do not change anything here unless you know what you are doing !
4476 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4477
4478 // This only works when invoked on a pthread. As we agreed not to use
4479 // primordial threads anyway, I assert here
4480 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4481
4482 // information about this api can be found (a) in the pthread.h header and
4483 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4484 //
4485 // The use of this API to find out the current stack is kind of undefined.
4486 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4487 // enough for cases where I let the pthread library create its stacks. For cases
4488 // where I create an own stack and pass this to pthread_create, it seems not to
4489 // work (the returned stack size in that case is 0).
4490
4491 pthread_t tid = pthread_self();
4492 struct __pthrdsinfo pinfo;
4493 char dummy[1]; // we only need this to satisfy the api and to not get E
4494 int dummy_size = sizeof(dummy);
4495
4496 memset(&pinfo, 0, sizeof(pinfo));
4497
4498 const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4499 sizeof(pinfo), dummy, &dummy_size);
4500
4501 if (rc != 0) {
4502 fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc);
4503 guarantee(0, "pthread_getthrds_np failed");
4504 }
4505
4506 guarantee(pinfo.__pi_stackend, "returned stack base invalid");
4507
4508 // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack
4509 // (when handing down a stack to pthread create, see pthread_attr_setstackaddr).
4510 // Not sure what to do here - I feel inclined to forbid this use case completely.
4511 guarantee(pinfo.__pi_stacksize, "returned stack size invalid");
4512
4513 // On AIX, stacks are not necessarily page aligned so round the base and size accordingly
4514 if (p_stack_base) {
4515 (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size());
4516 }
4517
4518 if (p_stack_size) {
4519 (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size();
4520 }
4521
4522 #ifndef PRODUCT
4523 if (Verbose) {
4524 fprintf(stderr,
4525 "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT
4526 ", real stack_size=" INTPTR_FORMAT
4527 ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n",
4528 (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize,
4529 (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()),
4530 pinfo.__pi_stacksize - os::Aix::stack_page_size());
4531 }
4532 #endif
4533
4534 } // end query_stack_dimensions
4535
4536 // get the current stack base from the OS (actually, the pthread library)
4537 address os::current_stack_base() {
4538 address p;
4539 query_stack_dimensions(&p, 0);
4540 return p;
4541 }
4542
4543 // get the current stack size from the OS (actually, the pthread library)
4544 size_t os::current_stack_size() {
4545 size_t s;
4546 query_stack_dimensions(0, &s);
4547 return s;
4548 }
4549
4550 // Refer to the comments in os_solaris.cpp park-unpark.
4551 //
4552 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4553 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4554 // For specifics regarding the bug see GLIBC BUGID 261237 :
4555 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4556 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4557 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4558 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4559 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4560 // and monitorenter when we're using 1-0 locking. All those operations may result in
4561 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4562 // of libpthread avoids the problem, but isn't practical.
4563 //
4564 // Possible remedies:
4565 //
4566 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4567 // This is palliative and probabilistic, however. If the thread is preempted
4568 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4569 // than the minimum period may have passed, and the abstime may be stale (in the
4570 // past) resultin in a hang. Using this technique reduces the odds of a hang
4571 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4572 //
4573 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4574 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4575 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4576 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4577 // thread.
4578 //
4579 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4580 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4581 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4582 // This also works well. In fact it avoids kernel-level scalability impediments
4583 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4584 // timers in a graceful fashion.
4585 //
4586 // 4. When the abstime value is in the past it appears that control returns
4587 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4588 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4589 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4590 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4591 // It may be possible to avoid reinitialization by checking the return
4592 // value from pthread_cond_timedwait(). In addition to reinitializing the
4593 // condvar we must establish the invariant that cond_signal() is only called
4594 // within critical sections protected by the adjunct mutex. This prevents
4595 // cond_signal() from "seeing" a condvar that's in the midst of being
4596 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4597 // desirable signal-after-unlock optimization that avoids futile context switching.
4598 //
4599 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4600 // structure when a condvar is used or initialized. cond_destroy() would
4601 // release the helper structure. Our reinitialize-after-timedwait fix
4602 // put excessive stress on malloc/free and locks protecting the c-heap.
4603 //
4604 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4605 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4606 // and only enabling the work-around for vulnerable environments.
4607
4608 // utility to compute the abstime argument to timedwait:
4609 // millis is the relative timeout time
4610 // abstime will be the absolute timeout time
4611 // TODO: replace compute_abstime() with unpackTime()
4612
4613 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4614 if (millis < 0) millis = 0;
4615 struct timeval now;
4616 int status = gettimeofday(&now, NULL);
4617 assert(status == 0, "gettimeofday");
4618 jlong seconds = millis / 1000;
4619 millis %= 1000;
4620 if (seconds > 50000000) { // see man cond_timedwait(3T)
4621 seconds = 50000000;
4622 }
4623 abstime->tv_sec = now.tv_sec + seconds;
4624 long usec = now.tv_usec + millis * 1000;
4625 if (usec >= 1000000) {
4626 abstime->tv_sec += 1;
4627 usec -= 1000000;
4628 }
4629 abstime->tv_nsec = usec * 1000;
4630 return abstime;
4631 }
4632
4633
4634 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4635 // Conceptually TryPark() should be equivalent to park(0).
4636
4637 int os::PlatformEvent::TryPark() {
4638 for (;;) {
4639 const int v = _Event;
4640 guarantee ((v == 0) || (v == 1), "invariant");
4641 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4642 }
4643 }
4644
4645 void os::PlatformEvent::park() { // AKA "down()"
4646 // Invariant: Only the thread associated with the Event/PlatformEvent
4647 // may call park().
4648 // TODO: assert that _Assoc != NULL or _Assoc == Self
4649 int v;
4650 for (;;) {
4651 v = _Event;
4652 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4653 }
4654 guarantee (v >= 0, "invariant");
4655 if (v == 0) {
4656 // Do this the hard way by blocking ...
4657 int status = pthread_mutex_lock(_mutex);
4658 assert_status(status == 0, status, "mutex_lock");
4659 guarantee (_nParked == 0, "invariant");
4660 ++ _nParked;
4661 while (_Event < 0) {
4662 status = pthread_cond_wait(_cond, _mutex);
4663 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4664 }
4665 -- _nParked;
4666
4667 // In theory we could move the ST of 0 into _Event past the unlock(),
4668 // but then we'd need a MEMBAR after the ST.
4669 _Event = 0;
4670 status = pthread_mutex_unlock(_mutex);
4671 assert_status(status == 0, status, "mutex_unlock");
4672 }
4673 guarantee (_Event >= 0, "invariant");
4674 }
4675
4676 int os::PlatformEvent::park(jlong millis) {
4677 guarantee (_nParked == 0, "invariant");
4678
4679 int v;
4680 for (;;) {
4681 v = _Event;
4682 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4683 }
4684 guarantee (v >= 0, "invariant");
4685 if (v != 0) return OS_OK;
4686
4687 // We do this the hard way, by blocking the thread.
4688 // Consider enforcing a minimum timeout value.
4689 struct timespec abst;
4690 compute_abstime(&abst, millis);
4691
4692 int ret = OS_TIMEOUT;
4693 int status = pthread_mutex_lock(_mutex);
4694 assert_status(status == 0, status, "mutex_lock");
4695 guarantee (_nParked == 0, "invariant");
4696 ++_nParked;
4697
4698 // Object.wait(timo) will return because of
4699 // (a) notification
4700 // (b) timeout
4701 // (c) thread.interrupt
4702 //
4703 // Thread.interrupt and object.notify{All} both call Event::set.
4704 // That is, we treat thread.interrupt as a special case of notification.
4705 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4706 // We assume all ETIME returns are valid.
4707 //
4708 // TODO: properly differentiate simultaneous notify+interrupt.
4709 // In that case, we should propagate the notify to another waiter.
4710
4711 while (_Event < 0) {
4712 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4713 assert_status(status == 0 || status == ETIMEDOUT,
4714 status, "cond_timedwait");
4715 if (!FilterSpuriousWakeups) break; // previous semantics
4716 if (status == ETIMEDOUT) break;
4717 // We consume and ignore EINTR and spurious wakeups.
4718 }
4719 --_nParked;
4720 if (_Event >= 0) {
4721 ret = OS_OK;
4722 }
4723 _Event = 0;
4724 status = pthread_mutex_unlock(_mutex);
4725 assert_status(status == 0, status, "mutex_unlock");
4726 assert (_nParked == 0, "invariant");
4727 return ret;
4728 }
4729
4730 void os::PlatformEvent::unpark() {
4731 int v, AnyWaiters;
4732 for (;;) {
4733 v = _Event;
4734 if (v > 0) {
4735 // The LD of _Event could have reordered or be satisfied
4736 // by a read-aside from this processor's write buffer.
4737 // To avoid problems execute a barrier and then
4738 // ratify the value.
4739 OrderAccess::fence();
4740 if (_Event == v) return;
4741 continue;
4742 }
4743 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4744 }
4745 if (v < 0) {
4746 // Wait for the thread associated with the event to vacate
4747 int status = pthread_mutex_lock(_mutex);
4748 assert_status(status == 0, status, "mutex_lock");
4749 AnyWaiters = _nParked;
4750
4751 if (AnyWaiters != 0) {
4752 // We intentional signal *after* dropping the lock
4753 // to avoid a common class of futile wakeups.
4754 status = pthread_cond_signal(_cond);
4755 assert_status(status == 0, status, "cond_signal");
4756 }
4757 // Mutex should be locked for pthread_cond_signal(_cond).
4758 status = pthread_mutex_unlock(_mutex);
4759 assert_status(status == 0, status, "mutex_unlock");
4760 }
4761
4762 // Note that we signal() _after dropping the lock for "immortal" Events.
4763 // This is safe and avoids a common class of futile wakeups. In rare
4764 // circumstances this can cause a thread to return prematurely from
4765 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4766 // simply re-test the condition and re-park itself.
4767 }
4768
4769
4770 // JSR166
4771 // -------------------------------------------------------
4772
4773 //
4774 // The solaris and linux implementations of park/unpark are fairly
4775 // conservative for now, but can be improved. They currently use a
4776 // mutex/condvar pair, plus a a count.
4777 // Park decrements count if > 0, else does a condvar wait. Unpark
4778 // sets count to 1 and signals condvar. Only one thread ever waits
4779 // on the condvar. Contention seen when trying to park implies that someone
4780 // is unparking you, so don't wait. And spurious returns are fine, so there
4781 // is no need to track notifications.
4782 //
4783
4784 #define MAX_SECS 100000000
4785 //
4786 // This code is common to linux and solaris and will be moved to a
4787 // common place in dolphin.
4788 //
4789 // The passed in time value is either a relative time in nanoseconds
4790 // or an absolute time in milliseconds. Either way it has to be unpacked
4791 // into suitable seconds and nanoseconds components and stored in the
4792 // given timespec structure.
4793 // Given time is a 64-bit value and the time_t used in the timespec is only
4794 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4795 // overflow if times way in the future are given. Further on Solaris versions
4796 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4797 // number of seconds, in abstime, is less than current_time + 100,000,000.
4798 // As it will be 28 years before "now + 100000000" will overflow we can
4799 // ignore overflow and just impose a hard-limit on seconds using the value
4800 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4801 // years from "now".
4802 //
4803
4804 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4805 assert (time > 0, "convertTime");
4806
4807 struct timeval now;
4808 int status = gettimeofday(&now, NULL);
4809 assert(status == 0, "gettimeofday");
4810
4811 time_t max_secs = now.tv_sec + MAX_SECS;
4812
4813 if (isAbsolute) {
4814 jlong secs = time / 1000;
4815 if (secs > max_secs) {
4816 absTime->tv_sec = max_secs;
4817 }
4818 else {
4819 absTime->tv_sec = secs;
4820 }
4821 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4822 }
4823 else {
4824 jlong secs = time / NANOSECS_PER_SEC;
4825 if (secs >= MAX_SECS) {
4826 absTime->tv_sec = max_secs;
4827 absTime->tv_nsec = 0;
4828 }
4829 else {
4830 absTime->tv_sec = now.tv_sec + secs;
4831 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4832 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4833 absTime->tv_nsec -= NANOSECS_PER_SEC;
4834 ++absTime->tv_sec; // note: this must be <= max_secs
4835 }
4836 }
4837 }
4838 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4839 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4840 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4841 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4842 }
4843
4844 void Parker::park(bool isAbsolute, jlong time) {
4845 // Optional fast-path check:
4846 // Return immediately if a permit is available.
4847 if (_counter > 0) {
4848 _counter = 0;
4849 OrderAccess::fence();
4850 return;
4851 }
4852
4853 Thread* thread = Thread::current();
4854 assert(thread->is_Java_thread(), "Must be JavaThread");
4855 JavaThread *jt = (JavaThread *)thread;
4856
4857 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4858 // Check interrupt before trying to wait
4859 if (Thread::is_interrupted(thread, false)) {
4860 return;
4861 }
4862
4863 // Next, demultiplex/decode time arguments
4864 timespec absTime;
4865 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4866 return;
4867 }
4868 if (time > 0) {
4869 unpackTime(&absTime, isAbsolute, time);
4870 }
4871
4872
4873 // Enter safepoint region
4874 // Beware of deadlocks such as 6317397.
4875 // The per-thread Parker:: mutex is a classic leaf-lock.
4876 // In particular a thread must never block on the Threads_lock while
4877 // holding the Parker:: mutex. If safepoints are pending both the
4878 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4879 ThreadBlockInVM tbivm(jt);
4880
4881 // Don't wait if cannot get lock since interference arises from
4882 // unblocking. Also. check interrupt before trying wait
4883 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4884 return;
4885 }
4886
4887 int status;
4888 if (_counter > 0) { // no wait needed
4889 _counter = 0;
4890 status = pthread_mutex_unlock(_mutex);
4891 assert (status == 0, "invariant");
4892 OrderAccess::fence();
4893 return;
4894 }
4895
4896 #ifdef ASSERT
4897 // Don't catch signals while blocked; let the running threads have the signals.
4898 // (This allows a debugger to break into the running thread.)
4899 sigset_t oldsigs;
4900 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4901 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4902 #endif
4903
4904 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4905 jt->set_suspend_equivalent();
4906 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4907
4908 if (time == 0) {
4909 status = pthread_cond_wait (_cond, _mutex);
4910 } else {
4911 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4912 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4913 pthread_cond_destroy (_cond);
4914 pthread_cond_init (_cond, NULL);
4915 }
4916 }
4917 assert_status(status == 0 || status == EINTR ||
4918 status == ETIME || status == ETIMEDOUT,
4919 status, "cond_timedwait");
4920
4921 #ifdef ASSERT
4922 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4923 #endif
4924
4925 _counter = 0;
4926 status = pthread_mutex_unlock(_mutex);
4927 assert_status(status == 0, status, "invariant");
4928 // If externally suspended while waiting, re-suspend
4929 if (jt->handle_special_suspend_equivalent_condition()) {
4930 jt->java_suspend_self();
4931 }
4932
4933 OrderAccess::fence();
4934 }
4935
4936 void Parker::unpark() {
4937 int s, status;
4938 status = pthread_mutex_lock(_mutex);
4939 assert (status == 0, "invariant");
4940 s = _counter;
4941 _counter = 1;
4942 if (s < 1) {
4943 if (WorkAroundNPTLTimedWaitHang) {
4944 status = pthread_cond_signal (_cond);
4945 assert (status == 0, "invariant");
4946 status = pthread_mutex_unlock(_mutex);
4947 assert (status == 0, "invariant");
4948 } else {
4949 status = pthread_mutex_unlock(_mutex);
4950 assert (status == 0, "invariant");
4951 status = pthread_cond_signal (_cond);
4952 assert (status == 0, "invariant");
4953 }
4954 } else {
4955 pthread_mutex_unlock(_mutex);
4956 assert (status == 0, "invariant");
4957 }
4958 }
4959
4960
4961 extern char** environ;
4962
4963 // Run the specified command in a separate process. Return its exit value,
4964 // or -1 on failure (e.g. can't fork a new process).
4965 // Unlike system(), this function can be called from signal handler. It
4966 // doesn't block SIGINT et al.
4967 int os::fork_and_exec(char* cmd) {
4968 char * argv[4] = {"sh", "-c", cmd, NULL};
4969
4970 pid_t pid = fork();
4971
4972 if (pid < 0) {
4973 // fork failed
4974 return -1;
4975
4976 } else if (pid == 0) {
4977 // child process
4978
4979 // try to be consistent with system(), which uses "/usr/bin/sh" on AIX
4980 execve("/usr/bin/sh", argv, environ);
4981
4982 // execve failed
4983 _exit(-1);
4984
4985 } else {
4986 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4987 // care about the actual exit code, for now.
4988
4989 int status;
4990
4991 // Wait for the child process to exit. This returns immediately if
4992 // the child has already exited. */
4993 while (waitpid(pid, &status, 0) < 0) {
4994 switch (errno) {
4995 case ECHILD: return 0;
4996 case EINTR: break;
4997 default: return -1;
4998 }
4999 }
5000
5001 if (WIFEXITED(status)) {
5002 // The child exited normally; get its exit code.
5003 return WEXITSTATUS(status);
5004 } else if (WIFSIGNALED(status)) {
5005 // The child exited because of a signal
5006 // The best value to return is 0x80 + signal number,
5007 // because that is what all Unix shells do, and because
5008 // it allows callers to distinguish between process exit and
5009 // process death by signal.
5010 return 0x80 + WTERMSIG(status);
5011 } else {
5012 // Unknown exit code; pass it through
5013 return status;
5014 }
5015 }
5016 // Remove warning.
5017 return -1;
5018 }
5019
5020 // is_headless_jre()
5021 //
5022 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
5023 // in order to report if we are running in a headless jre.
5024 //
5025 // Since JDK8 xawt/libmawt.so is moved into the same directory
5026 // as libawt.so, and renamed libawt_xawt.so
5027 bool os::is_headless_jre() {
5028 struct stat statbuf;
5029 char buf[MAXPATHLEN];
5030 char libmawtpath[MAXPATHLEN];
5031 const char *xawtstr = "/xawt/libmawt.so";
5032 const char *new_xawtstr = "/libawt_xawt.so";
5033
5034 char *p;
5035
5036 // Get path to libjvm.so
5037 os::jvm_path(buf, sizeof(buf));
5038
5039 // Get rid of libjvm.so
5040 p = strrchr(buf, '/');
5041 if (p == NULL) return false;
5042 else *p = '\0';
5043
5044 // Get rid of client or server
5045 p = strrchr(buf, '/');
5046 if (p == NULL) return false;
5047 else *p = '\0';
5048
5049 // check xawt/libmawt.so
5050 strcpy(libmawtpath, buf);
5051 strcat(libmawtpath, xawtstr);
5052 if (::stat(libmawtpath, &statbuf) == 0) return false;
5053
5054 // check libawt_xawt.so
5055 strcpy(libmawtpath, buf);
5056 strcat(libmawtpath, new_xawtstr);
5057 if (::stat(libmawtpath, &statbuf) == 0) return false;
5058
5059 return true;
5060 }
5061
5062 // Get the default path to the core file
5063 // Returns the length of the string
5064 int os::get_core_path(char* buffer, size_t bufferSize) {
5065 const char* p = get_current_directory(buffer, bufferSize);
5066
5067 if (p == NULL) {
5068 assert(p != NULL, "failed to get current directory");
5069 return 0;
5070 }
5071
5072 return strlen(buffer);
5073 }
5074
5075 #ifndef PRODUCT
5076 void TestReserveMemorySpecial_test() {
5077 // No tests available for this platform
5078 }
5079 #endif