1 /*
2 * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2016 SAP SE. 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 "logging/log.hpp"
40 #include "libo4.hpp"
41 #include "libperfstat_aix.hpp"
42 #include "libodm_aix.hpp"
43 #include "loadlib_aix.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "misc_aix.hpp"
47 #include "mutex_aix.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "os_aix.inline.hpp"
50 #include "os_share_aix.hpp"
51 #include "porting_aix.hpp"
52 #include "prims/jniFastGetField.hpp"
53 #include "prims/jvm.h"
54 #include "prims/jvm_misc.hpp"
55 #include "runtime/arguments.hpp"
56 #include "runtime/atomic.inline.hpp"
57 #include "runtime/extendedPC.hpp"
58 #include "runtime/globals.hpp"
59 #include "runtime/interfaceSupport.hpp"
60 #include "runtime/java.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/mutexLocker.hpp"
63 #include "runtime/objectMonitor.hpp"
64 #include "runtime/orderAccess.inline.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/osThread.hpp"
67 #include "runtime/perfMemory.hpp"
68 #include "runtime/sharedRuntime.hpp"
69 #include "runtime/statSampler.hpp"
70 #include "runtime/stubRoutines.hpp"
71 #include "runtime/thread.inline.hpp"
72 #include "runtime/threadCritical.hpp"
73 #include "runtime/timer.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "services/attachListener.hpp"
76 #include "services/runtimeService.hpp"
77 #include "utilities/decoder.hpp"
78 #include "utilities/defaultStream.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/vmError.hpp"
82
83 // put OS-includes here (sorted alphabetically)
84 #include <errno.h>
85 #include <fcntl.h>
86 #include <inttypes.h>
87 #include <poll.h>
88 #include <procinfo.h>
89 #include <pthread.h>
90 #include <pwd.h>
91 #include <semaphore.h>
92 #include <signal.h>
93 #include <stdint.h>
94 #include <stdio.h>
95 #include <string.h>
96 #include <unistd.h>
97 #include <sys/ioctl.h>
98 #include <sys/ipc.h>
99 #include <sys/mman.h>
100 #include <sys/resource.h>
101 #include <sys/select.h>
102 #include <sys/shm.h>
103 #include <sys/socket.h>
104 #include <sys/stat.h>
105 #include <sys/sysinfo.h>
106 #include <sys/systemcfg.h>
107 #include <sys/time.h>
108 #include <sys/times.h>
109 #include <sys/types.h>
110 #include <sys/utsname.h>
111 #include <sys/vminfo.h>
112 #include <sys/wait.h>
113
114 // Missing prototypes for various system APIs.
115 extern "C"
116 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
117
118 #if !defined(_AIXVERSION_610)
119 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
120 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
121 extern "C" int getargs (procsinfo*, int, char*, int);
122 #endif
123
124 #define MAX_PATH (2 * K)
125
126 // for timer info max values which include all bits
127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
128 // for multipage initialization error analysis (in 'g_multipage_error')
129 #define ERROR_MP_OS_TOO_OLD 100
130 #define ERROR_MP_EXTSHM_ACTIVE 101
131 #define ERROR_MP_VMGETINFO_FAILED 102
132 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
133
134 // Query dimensions of the stack of the calling thread.
135 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
136 static address resolve_function_descriptor_to_code_pointer(address p);
137
138 static void vmembk_print_on(outputStream* os);
139
140 ////////////////////////////////////////////////////////////////////////////////
141 // global variables (for a description see os_aix.hpp)
142
143 julong os::Aix::_physical_memory = 0;
144
145 pthread_t os::Aix::_main_thread = ((pthread_t)0);
146 int os::Aix::_page_size = -1;
147
148 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
149 int os::Aix::_on_pase = -1;
150
151 // 0 = uninitialized, otherwise 32 bit number:
152 // 0xVVRRTTSS
153 // VV - major version
154 // RR - minor version
155 // TT - tech level, if known, 0 otherwise
156 // SS - service pack, if known, 0 otherwise
157 uint32_t os::Aix::_os_version = 0;
158
159 int os::Aix::_stack_page_size = -1;
160
161 // -1 = uninitialized, 0 - no, 1 - yes
162 int os::Aix::_xpg_sus_mode = -1;
163
164 // -1 = uninitialized, 0 - no, 1 - yes
165 int os::Aix::_extshm = -1;
166
167 ////////////////////////////////////////////////////////////////////////////////
168 // local variables
169
170 static jlong initial_time_count = 0;
171 static int clock_tics_per_sec = 100;
172 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
173 static bool check_signals = true;
174 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
175 static sigset_t SR_sigset;
176
177 // Process break recorded at startup.
178 static address g_brk_at_startup = NULL;
179
180 // This describes the state of multipage support of the underlying
181 // OS. Note that this is of no interest to the outsize world and
182 // therefore should not be defined in AIX class.
183 //
184 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
185 // latter two (16M "large" resp. 16G "huge" pages) require special
186 // setup and are normally not available.
187 //
188 // AIX supports multiple page sizes per process, for:
189 // - Stack (of the primordial thread, so not relevant for us)
190 // - Data - data, bss, heap, for us also pthread stacks
191 // - Text - text code
192 // - shared memory
193 //
194 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
195 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
196 //
197 // For shared memory, page size can be set dynamically via
198 // shmctl(). Different shared memory regions can have different page
199 // sizes.
200 //
201 // More information can be found at AIBM info center:
202 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
203 //
204 static struct {
205 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
206 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
207 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
208 size_t pthr_stack_pagesize; // stack page size of pthread threads
209 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
210 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
211 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
212 int error; // Error describing if something went wrong at multipage init.
213 } g_multipage_support = {
214 (size_t) -1,
215 (size_t) -1,
216 (size_t) -1,
217 (size_t) -1,
218 (size_t) -1,
219 false, false,
220 0
221 };
222
223 // We must not accidentally allocate memory close to the BRK - even if
224 // that would work - because then we prevent the BRK segment from
225 // growing which may result in a malloc OOM even though there is
226 // enough memory. The problem only arises if we shmat() or mmap() at
227 // a specific wish address, e.g. to place the heap in a
228 // compressed-oops-friendly way.
229 static bool is_close_to_brk(address a) {
230 assert0(g_brk_at_startup != NULL);
231 if (a >= g_brk_at_startup &&
232 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
233 return true;
234 }
235 return false;
236 }
237
238 julong os::available_memory() {
239 return Aix::available_memory();
240 }
241
242 julong os::Aix::available_memory() {
243 // Avoid expensive API call here, as returned value will always be null.
244 if (os::Aix::on_pase()) {
245 return 0x0LL;
246 }
247 os::Aix::meminfo_t mi;
248 if (os::Aix::get_meminfo(&mi)) {
249 return mi.real_free;
250 } else {
251 return ULONG_MAX;
252 }
253 }
254
255 julong os::physical_memory() {
256 return Aix::physical_memory();
257 }
258
259 // Return true if user is running as root.
260
261 bool os::have_special_privileges() {
262 static bool init = false;
263 static bool privileges = false;
264 if (!init) {
265 privileges = (getuid() != geteuid()) || (getgid() != getegid());
266 init = true;
267 }
268 return privileges;
269 }
270
271 // Helper function, emulates disclaim64 using multiple 32bit disclaims
272 // because we cannot use disclaim64() on AS/400 and old AIX releases.
273 static bool my_disclaim64(char* addr, size_t size) {
274
275 if (size == 0) {
276 return true;
277 }
278
279 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
280 const unsigned int maxDisclaimSize = 0x40000000;
281
282 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
283 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
284
285 char* p = addr;
286
287 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
288 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
289 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
290 return false;
291 }
292 p += maxDisclaimSize;
293 }
294
295 if (lastDisclaimSize > 0) {
296 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
297 trcVerbose("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 // Wrap the function "vmgetinfo" which is not available on older OS releases.
315 static int checked_vmgetinfo(void *out, int command, int arg) {
316 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
317 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
318 }
319 return ::vmgetinfo(out, command, arg);
320 }
321
322 // Given an address, returns the size of the page backing that address.
323 size_t os::Aix::query_pagesize(void* addr) {
324
325 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
326 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
327 return SIZE_4K;
328 }
329
330 vm_page_info pi;
331 pi.addr = (uint64_t)addr;
332 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
333 return pi.pagesize;
334 } else {
335 assert(false, "vmgetinfo failed to retrieve page size");
336 return SIZE_4K;
337 }
338 }
339
340 void os::Aix::initialize_system_info() {
341
342 // Get the number of online(logical) cpus instead of configured.
343 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
344 assert(_processor_count > 0, "_processor_count must be > 0");
345
346 // Retrieve total physical storage.
347 os::Aix::meminfo_t mi;
348 if (!os::Aix::get_meminfo(&mi)) {
349 assert(false, "os::Aix::get_meminfo failed.");
350 }
351 _physical_memory = (julong) mi.real_total;
352 }
353
354 // Helper function for tracing page sizes.
355 static const char* describe_pagesize(size_t pagesize) {
356 switch (pagesize) {
357 case SIZE_4K : return "4K";
358 case SIZE_64K: return "64K";
359 case SIZE_16M: return "16M";
360 case SIZE_16G: return "16G";
361 default:
362 assert(false, "surprise");
363 return "??";
364 }
365 }
366
367 // Probe OS for multipage support.
368 // Will fill the global g_multipage_support structure.
369 // Must be called before calling os::large_page_init().
370 static void query_multipage_support() {
371
372 guarantee(g_multipage_support.pagesize == -1,
373 "do not call twice");
374
375 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
376
377 // This really would surprise me.
378 assert(g_multipage_support.pagesize == SIZE_4K, "surprise!");
379
380 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
381 // Default data page size is defined either by linker options (-bdatapsize)
382 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
383 // default should be 4K.
384 {
385 void* p = ::malloc(SIZE_16M);
386 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
387 ::free(p);
388 }
389
390 // Query default shm page size (LDR_CNTRL SHMPSIZE).
391 // Note that this is pure curiosity. We do not rely on default page size but set
392 // our own page size after allocated.
393 {
394 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
395 guarantee(shmid != -1, "shmget failed");
396 void* p = ::shmat(shmid, NULL, 0);
397 ::shmctl(shmid, IPC_RMID, NULL);
398 guarantee(p != (void*) -1, "shmat failed");
399 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
400 ::shmdt(p);
401 }
402
403 // Before querying the stack page size, make sure we are not running as primordial
404 // thread (because primordial thread's stack may have different page size than
405 // pthread thread stacks). Running a VM on the primordial thread won't work for a
406 // number of reasons so we may just as well guarantee it here.
407 guarantee0(!os::Aix::is_primordial_thread());
408
409 // Query pthread stack page size. Should be the same as data page size because
410 // pthread stacks are allocated from C-Heap.
411 {
412 int dummy = 0;
413 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
414 }
415
416 // Query default text page size (LDR_CNTRL TEXTPSIZE).
417 {
418 address any_function =
419 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
420 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
421 }
422
423 // Now probe for support of 64K pages and 16M pages.
424
425 // Before OS/400 V6R1, there is no support for pages other than 4K.
426 if (os::Aix::on_pase_V5R4_or_older()) {
427 trcVerbose("OS/400 < V6R1 - no large page support.");
428 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
429 goto query_multipage_support_end;
430 }
431
432 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
433 {
434 const int MAX_PAGE_SIZES = 4;
435 psize_t sizes[MAX_PAGE_SIZES];
436 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
437 if (num_psizes == -1) {
438 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
439 trcVerbose("disabling multipage support.");
440 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
441 goto query_multipage_support_end;
442 }
443 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
444 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
445 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
446 for (int i = 0; i < num_psizes; i ++) {
447 trcVerbose(" %s ", describe_pagesize(sizes[i]));
448 }
449
450 // Can we use 64K, 16M pages?
451 for (int i = 0; i < num_psizes; i ++) {
452 const size_t pagesize = sizes[i];
453 if (pagesize != SIZE_64K && pagesize != SIZE_16M) {
454 continue;
455 }
456 bool can_use = false;
457 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
458 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
459 IPC_CREAT | S_IRUSR | S_IWUSR);
460 guarantee0(shmid != -1); // Should always work.
461 // Try to set pagesize.
462 struct shmid_ds shm_buf = { 0 };
463 shm_buf.shm_pagesize = pagesize;
464 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
465 const int en = errno;
466 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
467 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
468 errno);
469 } else {
470 // Attach and double check pageisze.
471 void* p = ::shmat(shmid, NULL, 0);
472 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
473 guarantee0(p != (void*) -1); // Should always work.
474 const size_t real_pagesize = os::Aix::query_pagesize(p);
475 if (real_pagesize != pagesize) {
476 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
477 } else {
478 can_use = true;
479 }
480 ::shmdt(p);
481 }
482 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
483 if (pagesize == SIZE_64K) {
484 g_multipage_support.can_use_64K_pages = can_use;
485 } else if (pagesize == SIZE_16M) {
486 g_multipage_support.can_use_16M_pages = can_use;
487 }
488 }
489
490 } // end: check which pages can be used for shared memory
491
492 query_multipage_support_end:
493
494 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
495 describe_pagesize(g_multipage_support.pagesize));
496 trcVerbose("Data page size (C-Heap, bss, etc): %s",
497 describe_pagesize(g_multipage_support.datapsize));
498 trcVerbose("Text page size: %s",
499 describe_pagesize(g_multipage_support.textpsize));
500 trcVerbose("Thread stack page size (pthread): %s",
501 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
502 trcVerbose("Default shared memory page size: %s",
503 describe_pagesize(g_multipage_support.shmpsize));
504 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
505 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
506 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
507 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
508 trcVerbose("Multipage error details: %d",
509 g_multipage_support.error);
510
511 // sanity checks
512 assert0(g_multipage_support.pagesize == SIZE_4K);
513 assert0(g_multipage_support.datapsize == SIZE_4K || g_multipage_support.datapsize == SIZE_64K);
514 assert0(g_multipage_support.textpsize == SIZE_4K || g_multipage_support.textpsize == SIZE_64K);
515 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
516 assert0(g_multipage_support.shmpsize == SIZE_4K || g_multipage_support.shmpsize == SIZE_64K);
517
518 }
519
520 void os::init_system_properties_values() {
521
522 #define DEFAULT_LIBPATH "/lib:/usr/lib"
523 #define EXTENSIONS_DIR "/lib/ext"
524
525 // Buffer that fits several sprintfs.
526 // Note that the space for the trailing null is provided
527 // by the nulls included by the sizeof operator.
528 const size_t bufsize =
529 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
530 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
531 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
532
533 // sysclasspath, java_home, dll_dir
534 {
535 char *pslash;
536 os::jvm_path(buf, bufsize);
537
538 // Found the full path to libjvm.so.
539 // Now cut the path to <java_home>/jre if we can.
540 pslash = strrchr(buf, '/');
541 if (pslash != NULL) {
542 *pslash = '\0'; // Get rid of /libjvm.so.
543 }
544 pslash = strrchr(buf, '/');
545 if (pslash != NULL) {
546 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
547 }
548 Arguments::set_dll_dir(buf);
549
550 if (pslash != NULL) {
551 pslash = strrchr(buf, '/');
552 if (pslash != NULL) {
553 *pslash = '\0'; // Get rid of /<arch>.
554 pslash = strrchr(buf, '/');
555 if (pslash != NULL) {
556 *pslash = '\0'; // Get rid of /lib.
557 }
558 }
559 }
560 Arguments::set_java_home(buf);
561 set_boot_path('/', ':');
562 }
563
564 // Where to look for native libraries.
565
566 // On Aix we get the user setting of LIBPATH.
567 // Eventually, all the library path setting will be done here.
568 // Get the user setting of LIBPATH.
569 const char *v = ::getenv("LIBPATH");
570 const char *v_colon = ":";
571 if (v == NULL) { v = ""; v_colon = ""; }
572
573 // Concatenate user and invariant part of ld_library_path.
574 // That's +1 for the colon and +1 for the trailing '\0'.
575 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
576 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
577 Arguments::set_library_path(ld_library_path);
578 FREE_C_HEAP_ARRAY(char, ld_library_path);
579
580 // Extensions directories.
581 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
582 Arguments::set_ext_dirs(buf);
583
584 FREE_C_HEAP_ARRAY(char, buf);
585
586 #undef DEFAULT_LIBPATH
587 #undef EXTENSIONS_DIR
588 }
589
590 ////////////////////////////////////////////////////////////////////////////////
591 // breakpoint support
592
593 void os::breakpoint() {
594 BREAKPOINT;
595 }
596
597 extern "C" void breakpoint() {
598 // use debugger to set breakpoint here
599 }
600
601 ////////////////////////////////////////////////////////////////////////////////
602 // signal support
603
604 debug_only(static bool signal_sets_initialized = false);
605 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
606
607 bool os::Aix::is_sig_ignored(int sig) {
608 struct sigaction oact;
609 sigaction(sig, (struct sigaction*)NULL, &oact);
610 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
611 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
612 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
613 return true;
614 } else {
615 return false;
616 }
617 }
618
619 void os::Aix::signal_sets_init() {
620 // Should also have an assertion stating we are still single-threaded.
621 assert(!signal_sets_initialized, "Already initialized");
622 // Fill in signals that are necessarily unblocked for all threads in
623 // the VM. Currently, we unblock the following signals:
624 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
625 // by -Xrs (=ReduceSignalUsage));
626 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
627 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
628 // the dispositions or masks wrt these signals.
629 // Programs embedding the VM that want to use the above signals for their
630 // own purposes must, at this time, use the "-Xrs" option to prevent
631 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
632 // (See bug 4345157, and other related bugs).
633 // In reality, though, unblocking these signals is really a nop, since
634 // these signals are not blocked by default.
635 sigemptyset(&unblocked_sigs);
636 sigemptyset(&allowdebug_blocked_sigs);
637 sigaddset(&unblocked_sigs, SIGILL);
638 sigaddset(&unblocked_sigs, SIGSEGV);
639 sigaddset(&unblocked_sigs, SIGBUS);
640 sigaddset(&unblocked_sigs, SIGFPE);
641 sigaddset(&unblocked_sigs, SIGTRAP);
642 sigaddset(&unblocked_sigs, SIGDANGER);
643 sigaddset(&unblocked_sigs, SR_signum);
644
645 if (!ReduceSignalUsage) {
646 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
647 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
648 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
649 }
650 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
651 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
652 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
653 }
654 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
655 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
656 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
657 }
658 }
659 // Fill in signals that are blocked by all but the VM thread.
660 sigemptyset(&vm_sigs);
661 if (!ReduceSignalUsage)
662 sigaddset(&vm_sigs, BREAK_SIGNAL);
663 debug_only(signal_sets_initialized = true);
664 }
665
666 // These are signals that are unblocked while a thread is running Java.
667 // (For some reason, they get blocked by default.)
668 sigset_t* os::Aix::unblocked_signals() {
669 assert(signal_sets_initialized, "Not initialized");
670 return &unblocked_sigs;
671 }
672
673 // These are the signals that are blocked while a (non-VM) thread is
674 // running Java. Only the VM thread handles these signals.
675 sigset_t* os::Aix::vm_signals() {
676 assert(signal_sets_initialized, "Not initialized");
677 return &vm_sigs;
678 }
679
680 // These are signals that are blocked during cond_wait to allow debugger in
681 sigset_t* os::Aix::allowdebug_blocked_signals() {
682 assert(signal_sets_initialized, "Not initialized");
683 return &allowdebug_blocked_sigs;
684 }
685
686 void os::Aix::hotspot_sigmask(Thread* thread) {
687
688 //Save caller's signal mask before setting VM signal mask
689 sigset_t caller_sigmask;
690 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
691
692 OSThread* osthread = thread->osthread();
693 osthread->set_caller_sigmask(caller_sigmask);
694
695 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
696
697 if (!ReduceSignalUsage) {
698 if (thread->is_VM_thread()) {
699 // Only the VM thread handles BREAK_SIGNAL ...
700 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
701 } else {
702 // ... all other threads block BREAK_SIGNAL
703 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
704 }
705 }
706 }
707
708 // retrieve memory information.
709 // Returns false if something went wrong;
710 // content of pmi undefined in this case.
711 bool os::Aix::get_meminfo(meminfo_t* pmi) {
712
713 assert(pmi, "get_meminfo: invalid parameter");
714
715 memset(pmi, 0, sizeof(meminfo_t));
716
717 if (os::Aix::on_pase()) {
718 // On PASE, use the libo4 porting library.
719
720 unsigned long long virt_total = 0;
721 unsigned long long real_total = 0;
722 unsigned long long real_free = 0;
723 unsigned long long pgsp_total = 0;
724 unsigned long long pgsp_free = 0;
725 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
726 pmi->virt_total = virt_total;
727 pmi->real_total = real_total;
728 pmi->real_free = real_free;
729 pmi->pgsp_total = pgsp_total;
730 pmi->pgsp_free = pgsp_free;
731 return true;
732 }
733 return false;
734
735 } else {
736
737 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
738 // See:
739 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
740 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
741 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
742 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
743
744 perfstat_memory_total_t psmt;
745 memset (&psmt, '\0', sizeof(psmt));
746 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
747 if (rc == -1) {
748 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
749 assert(0, "perfstat_memory_total() failed");
750 return false;
751 }
752
753 assert(rc == 1, "perfstat_memory_total() - weird return code");
754
755 // excerpt from
756 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
757 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
758 // The fields of perfstat_memory_total_t:
759 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
760 // u_longlong_t real_total Total real memory (in 4 KB pages).
761 // u_longlong_t real_free Free real memory (in 4 KB pages).
762 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
763 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
764
765 pmi->virt_total = psmt.virt_total * 4096;
766 pmi->real_total = psmt.real_total * 4096;
767 pmi->real_free = psmt.real_free * 4096;
768 pmi->pgsp_total = psmt.pgsp_total * 4096;
769 pmi->pgsp_free = psmt.pgsp_free * 4096;
770
771 return true;
772
773 }
774 } // end os::Aix::get_meminfo
775
776 //////////////////////////////////////////////////////////////////////////////
777 // create new thread
778
779 // Thread start routine for all newly created threads
780 static void *thread_native_entry(Thread *thread) {
781
782 // find out my own stack dimensions
783 {
784 // actually, this should do exactly the same as thread->record_stack_base_and_size...
785 address base = 0;
786 size_t size = 0;
787 query_stack_dimensions(&base, &size);
788 thread->set_stack_base(base);
789 thread->set_stack_size(size);
790 }
791
792 const pthread_t pthread_id = ::pthread_self();
793 const tid_t kernel_thread_id = ::thread_self();
794
795 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
796 os::current_thread_id(), (uintx) kernel_thread_id);
797
798 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
799 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
800 // tools hook pthread_create(). In this case, we may run into problems establishing
801 // guard pages on those stacks, because the stacks may reside in memory which is not
802 // protectable (shmated).
803 if (thread->stack_base() > ::sbrk(0)) {
804 log_warning(os, thread)("Thread stack not in data segment.");
805 }
806
807 // Try to randomize the cache line index of hot stack frames.
808 // This helps when threads of the same stack traces evict each other's
809 // cache lines. The threads can be either from the same JVM instance, or
810 // from different JVM instances. The benefit is especially true for
811 // processors with hyperthreading technology.
812
813 static int counter = 0;
814 int pid = os::current_process_id();
815 alloca(((pid ^ counter++) & 7) * 128);
816
817 thread->initialize_thread_current();
818
819 OSThread* osthread = thread->osthread();
820
821 // Thread_id is pthread id.
822 osthread->set_thread_id(pthread_id);
823
824 // .. but keep kernel thread id too for diagnostics
825 osthread->set_kernel_thread_id(kernel_thread_id);
826
827 // Initialize signal mask for this thread.
828 os::Aix::hotspot_sigmask(thread);
829
830 // Initialize floating point control register.
831 os::Aix::init_thread_fpu_state();
832
833 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
834
835 // Call one more level start routine.
836 thread->run();
837
838 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
839 os::current_thread_id(), (uintx) kernel_thread_id);
840
841 // If a thread has not deleted itself ("delete this") as part of its
842 // termination sequence, we have to ensure thread-local-storage is
843 // cleared before we actually terminate. No threads should ever be
844 // deleted asynchronously with respect to their termination.
845 if (Thread::current_or_null_safe() != NULL) {
846 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
847 thread->clear_thread_current();
848 }
849
850 return 0;
851 }
852
853 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
854
855 assert(thread->osthread() == NULL, "caller responsible");
856
857 // Allocate the OSThread object
858 OSThread* osthread = new OSThread(NULL, NULL);
859 if (osthread == NULL) {
860 return false;
861 }
862
863 // set the correct thread state
864 osthread->set_thread_type(thr_type);
865
866 // Initial state is ALLOCATED but not INITIALIZED
867 osthread->set_state(ALLOCATED);
868
869 thread->set_osthread(osthread);
870
871 // init thread attributes
872 pthread_attr_t attr;
873 pthread_attr_init(&attr);
874 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
875
876 // Make sure we run in 1:1 kernel-user-thread mode.
877 if (os::Aix::on_aix()) {
878 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
879 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
880 } // end: aix
881
882 // Start in suspended state, and in os::thread_start, wake the thread up.
883 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
884
885 // calculate stack size if it's not specified by caller
886 if (stack_size == 0) {
887 stack_size = os::Aix::default_stack_size(thr_type);
888
889 switch (thr_type) {
890 case os::java_thread:
891 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
892 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
893 stack_size = JavaThread::stack_size_at_create();
894 break;
895 case os::compiler_thread:
896 if (CompilerThreadStackSize > 0) {
897 stack_size = (size_t)(CompilerThreadStackSize * K);
898 break;
899 } // else fall through:
900 // use VMThreadStackSize if CompilerThreadStackSize is not defined
901 case os::vm_thread:
902 case os::pgc_thread:
903 case os::cgc_thread:
904 case os::watcher_thread:
905 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
906 break;
907 }
908 }
909
910 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
911 pthread_attr_setstacksize(&attr, stack_size);
912
913 pthread_t tid;
914 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
915
916
917 char buf[64];
918 if (ret == 0) {
919 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
920 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
921 } else {
922 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
923 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
924 }
925
926 pthread_attr_destroy(&attr);
927
928 if (ret != 0) {
929 // Need to clean up stuff we've allocated so far
930 thread->set_osthread(NULL);
931 delete osthread;
932 return false;
933 }
934
935 // OSThread::thread_id is the pthread id.
936 osthread->set_thread_id(tid);
937
938 return true;
939 }
940
941 /////////////////////////////////////////////////////////////////////////////
942 // attach existing thread
943
944 // bootstrap the main thread
945 bool os::create_main_thread(JavaThread* thread) {
946 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
947 return create_attached_thread(thread);
948 }
949
950 bool os::create_attached_thread(JavaThread* thread) {
951 #ifdef ASSERT
952 thread->verify_not_published();
953 #endif
954
955 // Allocate the OSThread object
956 OSThread* osthread = new OSThread(NULL, NULL);
957
958 if (osthread == NULL) {
959 return false;
960 }
961
962 const pthread_t pthread_id = ::pthread_self();
963 const tid_t kernel_thread_id = ::thread_self();
964
965 // OSThread::thread_id is the pthread id.
966 osthread->set_thread_id(pthread_id);
967
968 // .. but keep kernel thread id too for diagnostics
969 osthread->set_kernel_thread_id(kernel_thread_id);
970
971 // initialize floating point control register
972 os::Aix::init_thread_fpu_state();
973
974 // Initial thread state is RUNNABLE
975 osthread->set_state(RUNNABLE);
976
977 thread->set_osthread(osthread);
978
979 if (UseNUMA) {
980 int lgrp_id = os::numa_get_group_id();
981 if (lgrp_id != -1) {
982 thread->set_lgrp_id(lgrp_id);
983 }
984 }
985
986 // initialize signal mask for this thread
987 // and save the caller's signal mask
988 os::Aix::hotspot_sigmask(thread);
989
990 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
991 os::current_thread_id(), (uintx) kernel_thread_id);
992
993 return true;
994 }
995
996 void os::pd_start_thread(Thread* thread) {
997 int status = pthread_continue_np(thread->osthread()->pthread_id());
998 assert(status == 0, "thr_continue failed");
999 }
1000
1001 // Free OS resources related to the OSThread
1002 void os::free_thread(OSThread* osthread) {
1003 assert(osthread != NULL, "osthread not set");
1004
1005 // We are told to free resources of the argument thread,
1006 // but we can only really operate on the current thread.
1007 assert(Thread::current()->osthread() == osthread,
1008 "os::free_thread but not current thread");
1009
1010 // Restore caller's signal mask
1011 sigset_t sigmask = osthread->caller_sigmask();
1012 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1013
1014 delete osthread;
1015 }
1016
1017 ////////////////////////////////////////////////////////////////////////////////
1018 // time support
1019
1020 // Time since start-up in seconds to a fine granularity.
1021 // Used by VMSelfDestructTimer and the MemProfiler.
1022 double os::elapsedTime() {
1023 return (double)(os::elapsed_counter()) * 0.000001;
1024 }
1025
1026 jlong os::elapsed_counter() {
1027 timeval time;
1028 int status = gettimeofday(&time, NULL);
1029 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1030 }
1031
1032 jlong os::elapsed_frequency() {
1033 return (1000 * 1000);
1034 }
1035
1036 bool os::supports_vtime() { return true; }
1037 bool os::enable_vtime() { return false; }
1038 bool os::vtime_enabled() { return false; }
1039
1040 double os::elapsedVTime() {
1041 struct rusage usage;
1042 int retval = getrusage(RUSAGE_THREAD, &usage);
1043 if (retval == 0) {
1044 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1045 } else {
1046 // better than nothing, but not much
1047 return elapsedTime();
1048 }
1049 }
1050
1051 jlong os::javaTimeMillis() {
1052 timeval time;
1053 int status = gettimeofday(&time, NULL);
1054 assert(status != -1, "aix error at gettimeofday()");
1055 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1056 }
1057
1058 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1059 timeval time;
1060 int status = gettimeofday(&time, NULL);
1061 assert(status != -1, "aix error at gettimeofday()");
1062 seconds = jlong(time.tv_sec);
1063 nanos = jlong(time.tv_usec) * 1000;
1064 }
1065
1066 jlong os::javaTimeNanos() {
1067 if (os::Aix::on_pase()) {
1068
1069 timeval time;
1070 int status = gettimeofday(&time, NULL);
1071 assert(status != -1, "PASE error at gettimeofday()");
1072 jlong usecs = jlong((unsigned long long) time.tv_sec * (1000 * 1000) + time.tv_usec);
1073 return 1000 * usecs;
1074
1075 } else {
1076 // On AIX use the precision of processors real time clock
1077 // or time base registers.
1078 timebasestruct_t time;
1079 int rc;
1080
1081 // If the CPU has a time register, it will be used and
1082 // we have to convert to real time first. After convertion we have following data:
1083 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1084 // time.tb_low [nanoseconds after the last full second above]
1085 // We better use mread_real_time here instead of read_real_time
1086 // to ensure that we will get a monotonic increasing time.
1087 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1088 rc = time_base_to_time(&time, TIMEBASE_SZ);
1089 assert(rc != -1, "aix error at time_base_to_time()");
1090 }
1091 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1092 }
1093 }
1094
1095 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1096 info_ptr->max_value = ALL_64_BITS;
1097 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1098 info_ptr->may_skip_backward = false;
1099 info_ptr->may_skip_forward = false;
1100 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1101 }
1102
1103 // Return the real, user, and system times in seconds from an
1104 // arbitrary fixed point in the past.
1105 bool os::getTimesSecs(double* process_real_time,
1106 double* process_user_time,
1107 double* process_system_time) {
1108 struct tms ticks;
1109 clock_t real_ticks = times(&ticks);
1110
1111 if (real_ticks == (clock_t) (-1)) {
1112 return false;
1113 } else {
1114 double ticks_per_second = (double) clock_tics_per_sec;
1115 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1116 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1117 *process_real_time = ((double) real_ticks) / ticks_per_second;
1118
1119 return true;
1120 }
1121 }
1122
1123 char * os::local_time_string(char *buf, size_t buflen) {
1124 struct tm t;
1125 time_t long_time;
1126 time(&long_time);
1127 localtime_r(&long_time, &t);
1128 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1129 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1130 t.tm_hour, t.tm_min, t.tm_sec);
1131 return buf;
1132 }
1133
1134 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1135 return localtime_r(clock, res);
1136 }
1137
1138 ////////////////////////////////////////////////////////////////////////////////
1139 // runtime exit support
1140
1141 // Note: os::shutdown() might be called very early during initialization, or
1142 // called from signal handler. Before adding something to os::shutdown(), make
1143 // sure it is async-safe and can handle partially initialized VM.
1144 void os::shutdown() {
1145
1146 // allow PerfMemory to attempt cleanup of any persistent resources
1147 perfMemory_exit();
1148
1149 // needs to remove object in file system
1150 AttachListener::abort();
1151
1152 // flush buffered output, finish log files
1153 ostream_abort();
1154
1155 // Check for abort hook
1156 abort_hook_t abort_hook = Arguments::abort_hook();
1157 if (abort_hook != NULL) {
1158 abort_hook();
1159 }
1160 }
1161
1162 // Note: os::abort() might be called very early during initialization, or
1163 // called from signal handler. Before adding something to os::abort(), make
1164 // sure it is async-safe and can handle partially initialized VM.
1165 void os::abort(bool dump_core, void* siginfo, const void* context) {
1166 os::shutdown();
1167 if (dump_core) {
1168 #ifndef PRODUCT
1169 fdStream out(defaultStream::output_fd());
1170 out.print_raw("Current thread is ");
1171 char buf[16];
1172 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1173 out.print_raw_cr(buf);
1174 out.print_raw_cr("Dumping core ...");
1175 #endif
1176 ::abort(); // dump core
1177 }
1178
1179 ::exit(1);
1180 }
1181
1182 // Die immediately, no exit hook, no abort hook, no cleanup.
1183 void os::die() {
1184 ::abort();
1185 }
1186
1187 // This method is a copy of JDK's sysGetLastErrorString
1188 // from src/solaris/hpi/src/system_md.c
1189
1190 size_t os::lasterror(char *buf, size_t len) {
1191 if (errno == 0) return 0;
1192
1193 const char *s = os::strerror(errno);
1194 size_t n = ::strlen(s);
1195 if (n >= len) {
1196 n = len - 1;
1197 }
1198 ::strncpy(buf, s, n);
1199 buf[n] = '\0';
1200 return n;
1201 }
1202
1203 intx os::current_thread_id() {
1204 return (intx)pthread_self();
1205 }
1206
1207 int os::current_process_id() {
1208 return getpid();
1209 }
1210
1211 // DLL functions
1212
1213 const char* os::dll_file_extension() { return ".so"; }
1214
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() { return "/tmp"; }
1218
1219 static bool file_exists(const char* filename) {
1220 struct stat statbuf;
1221 if (filename == NULL || strlen(filename) == 0) {
1222 return false;
1223 }
1224 return os::stat(filename, &statbuf) == 0;
1225 }
1226
1227 bool os::dll_build_name(char* buffer, size_t buflen,
1228 const char* pname, const char* fname) {
1229 bool retval = false;
1230 // Copied from libhpi
1231 const size_t pnamelen = pname ? strlen(pname) : 0;
1232
1233 // Return error on buffer overflow.
1234 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1235 *buffer = '\0';
1236 return retval;
1237 }
1238
1239 if (pnamelen == 0) {
1240 snprintf(buffer, buflen, "lib%s.so", fname);
1241 retval = true;
1242 } else if (strchr(pname, *os::path_separator()) != NULL) {
1243 int n;
1244 char** pelements = split_path(pname, &n);
1245 if (pelements == NULL) {
1246 return false;
1247 }
1248 for (int i = 0; i < n; i++) {
1249 // Really shouldn't be NULL, but check can't hurt
1250 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1251 continue; // skip the empty path values
1252 }
1253 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1254 if (file_exists(buffer)) {
1255 retval = true;
1256 break;
1257 }
1258 }
1259 // release the storage
1260 for (int i = 0; i < n; i++) {
1261 if (pelements[i] != NULL) {
1262 FREE_C_HEAP_ARRAY(char, pelements[i]);
1263 }
1264 }
1265 if (pelements != NULL) {
1266 FREE_C_HEAP_ARRAY(char*, pelements);
1267 }
1268 } else {
1269 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1270 retval = true;
1271 }
1272 return retval;
1273 }
1274
1275 // Check if addr is inside libjvm.so.
1276 bool os::address_is_in_vm(address addr) {
1277
1278 // Input could be a real pc or a function pointer literal. The latter
1279 // would be a function descriptor residing in the data segment of a module.
1280 loaded_module_t lm;
1281 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1282 return lm.is_in_vm;
1283 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1284 return lm.is_in_vm;
1285 } else {
1286 return false;
1287 }
1288
1289 }
1290
1291 // Resolve an AIX function descriptor literal to a code pointer.
1292 // If the input is a valid code pointer to a text segment of a loaded module,
1293 // it is returned unchanged.
1294 // If the input is a valid AIX function descriptor, it is resolved to the
1295 // code entry point.
1296 // If the input is neither a valid function descriptor nor a valid code pointer,
1297 // NULL is returned.
1298 static address resolve_function_descriptor_to_code_pointer(address p) {
1299
1300 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1301 // It is a real code pointer.
1302 return p;
1303 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1304 // Pointer to data segment, potential function descriptor.
1305 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1306 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1307 // It is a function descriptor.
1308 return code_entry;
1309 }
1310 }
1311
1312 return NULL;
1313 }
1314
1315 bool os::dll_address_to_function_name(address addr, char *buf,
1316 int buflen, int *offset,
1317 bool demangle) {
1318 if (offset) {
1319 *offset = -1;
1320 }
1321 // Buf is not optional, but offset is optional.
1322 assert(buf != NULL, "sanity check");
1323 buf[0] = '\0';
1324
1325 // Resolve function ptr literals first.
1326 addr = resolve_function_descriptor_to_code_pointer(addr);
1327 if (!addr) {
1328 return false;
1329 }
1330
1331 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1332 }
1333
1334 bool os::dll_address_to_library_name(address addr, char* buf,
1335 int buflen, int* offset) {
1336 if (offset) {
1337 *offset = -1;
1338 }
1339 // Buf is not optional, but offset is optional.
1340 assert(buf != NULL, "sanity check");
1341 buf[0] = '\0';
1342
1343 // Resolve function ptr literals first.
1344 addr = resolve_function_descriptor_to_code_pointer(addr);
1345 if (!addr) {
1346 return false;
1347 }
1348
1349 return AixSymbols::get_module_name(addr, buf, buflen);
1350 }
1351
1352 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1353 // for the same architecture as Hotspot is running on.
1354 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1355
1356 if (ebuf && ebuflen > 0) {
1357 ebuf[0] = '\0';
1358 ebuf[ebuflen - 1] = '\0';
1359 }
1360
1361 if (!filename || strlen(filename) == 0) {
1362 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1363 return NULL;
1364 }
1365
1366 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1367 void * result= ::dlopen(filename, RTLD_LAZY);
1368 if (result != NULL) {
1369 // Reload dll cache. Don't do this in signal handling.
1370 LoadedLibraries::reload();
1371 return result;
1372 } else {
1373 // error analysis when dlopen fails
1374 const char* const error_report = ::dlerror();
1375 if (error_report && ebuf && ebuflen > 0) {
1376 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1377 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1378 }
1379 }
1380 return NULL;
1381 }
1382
1383 void* os::dll_lookup(void* handle, const char* name) {
1384 void* res = dlsym(handle, name);
1385 return res;
1386 }
1387
1388 void* os::get_default_process_handle() {
1389 return (void*)::dlopen(NULL, RTLD_LAZY);
1390 }
1391
1392 void os::print_dll_info(outputStream *st) {
1393 st->print_cr("Dynamic libraries:");
1394 LoadedLibraries::print(st);
1395 }
1396
1397 void os::get_summary_os_info(char* buf, size_t buflen) {
1398 // There might be something more readable than uname results for AIX.
1399 struct utsname name;
1400 uname(&name);
1401 snprintf(buf, buflen, "%s %s", name.release, name.version);
1402 }
1403
1404 void os::print_os_info(outputStream* st) {
1405 st->print("OS:");
1406
1407 st->print("uname:");
1408 struct utsname name;
1409 uname(&name);
1410 st->print(name.sysname); st->print(" ");
1411 st->print(name.nodename); st->print(" ");
1412 st->print(name.release); st->print(" ");
1413 st->print(name.version); st->print(" ");
1414 st->print(name.machine);
1415 st->cr();
1416
1417 uint32_t ver = os::Aix::os_version();
1418 st->print_cr("AIX kernel version %u.%u.%u.%u",
1419 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1420
1421 // rlimit
1422 st->print("rlimit:");
1423 struct rlimit rlim;
1424
1425 st->print(" STACK ");
1426 getrlimit(RLIMIT_STACK, &rlim);
1427 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1428 else st->print("%uk", rlim.rlim_cur >> 10);
1429
1430 st->print(", CORE ");
1431 getrlimit(RLIMIT_CORE, &rlim);
1432 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1433 else st->print("%uk", rlim.rlim_cur >> 10);
1434
1435 st->print(", NPROC ");
1436 st->print("%d", sysconf(_SC_CHILD_MAX));
1437
1438 st->print(", NOFILE ");
1439 getrlimit(RLIMIT_NOFILE, &rlim);
1440 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1441 else st->print("%d", rlim.rlim_cur);
1442
1443 st->print(", AS ");
1444 getrlimit(RLIMIT_AS, &rlim);
1445 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1446 else st->print("%uk", rlim.rlim_cur >> 10);
1447
1448 // Print limits on DATA, because it limits the C-heap.
1449 st->print(", DATA ");
1450 getrlimit(RLIMIT_DATA, &rlim);
1451 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1452 else st->print("%uk", rlim.rlim_cur >> 10);
1453 st->cr();
1454
1455 // load average
1456 st->print("load average:");
1457 double loadavg[3] = {-1.L, -1.L, -1.L};
1458 os::loadavg(loadavg, 3);
1459 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1460 st->cr();
1461
1462 // print wpar info
1463 libperfstat::wparinfo_t wi;
1464 if (libperfstat::get_wparinfo(&wi)) {
1465 st->print_cr("wpar info");
1466 st->print_cr("name: %s", wi.name);
1467 st->print_cr("id: %d", wi.wpar_id);
1468 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1469 }
1470
1471 // print partition info
1472 libperfstat::partitioninfo_t pi;
1473 if (libperfstat::get_partitioninfo(&pi)) {
1474 st->print_cr("partition info");
1475 st->print_cr(" name: %s", pi.name);
1476 }
1477
1478 }
1479
1480 void os::print_memory_info(outputStream* st) {
1481
1482 st->print_cr("Memory:");
1483
1484 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1485 describe_pagesize(g_multipage_support.pagesize));
1486 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1487 describe_pagesize(g_multipage_support.datapsize));
1488 st->print_cr(" Text page size: %s",
1489 describe_pagesize(g_multipage_support.textpsize));
1490 st->print_cr(" Thread stack page size (pthread): %s",
1491 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1492 st->print_cr(" Default shared memory page size: %s",
1493 describe_pagesize(g_multipage_support.shmpsize));
1494 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1495 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1496 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1497 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1498 st->print_cr(" Multipage error: %d",
1499 g_multipage_support.error);
1500 st->cr();
1501 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1502 // not used in OpenJDK st->print_cr(" os::stack_page_size: %s", describe_pagesize(os::stack_page_size()));
1503
1504 // print out LDR_CNTRL because it affects the default page sizes
1505 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1506 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1507
1508 // Print out EXTSHM because it is an unsupported setting.
1509 const char* const extshm = ::getenv("EXTSHM");
1510 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1511 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1512 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1513 }
1514
1515 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1516 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1517 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1518 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1519
1520 os::Aix::meminfo_t mi;
1521 if (os::Aix::get_meminfo(&mi)) {
1522 char buffer[256];
1523 if (os::Aix::on_aix()) {
1524 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1525 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1526 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1527 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1528 } else {
1529 // PASE - Numbers are result of QWCRSSTS; they mean:
1530 // real_total: Sum of all system pools
1531 // real_free: always 0
1532 // pgsp_total: we take the size of the system ASP
1533 // pgsp_free: size of system ASP times percentage of system ASP unused
1534 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1535 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1536 st->print_cr("%% system asp used : " SIZE_FORMAT,
1537 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1538 }
1539 st->print_raw(buffer);
1540 }
1541 st->cr();
1542
1543 // Print segments allocated with os::reserve_memory.
1544 st->print_cr("internal virtual memory regions used by vm:");
1545 vmembk_print_on(st);
1546 }
1547
1548 // Get a string for the cpuinfo that is a summary of the cpu type
1549 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1550 // This looks good
1551 libperfstat::cpuinfo_t ci;
1552 if (libperfstat::get_cpuinfo(&ci)) {
1553 strncpy(buf, ci.version, buflen);
1554 } else {
1555 strncpy(buf, "AIX", buflen);
1556 }
1557 }
1558
1559 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1560 st->print("CPU:");
1561 st->print("total %d", os::processor_count());
1562 // It's not safe to query number of active processors after crash.
1563 // st->print("(active %d)", os::active_processor_count());
1564 st->print(" %s", VM_Version::features());
1565 st->cr();
1566 }
1567
1568 static void print_signal_handler(outputStream* st, int sig,
1569 char* buf, size_t buflen);
1570
1571 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1572 st->print_cr("Signal Handlers:");
1573 print_signal_handler(st, SIGSEGV, buf, buflen);
1574 print_signal_handler(st, SIGBUS , buf, buflen);
1575 print_signal_handler(st, SIGFPE , buf, buflen);
1576 print_signal_handler(st, SIGPIPE, buf, buflen);
1577 print_signal_handler(st, SIGXFSZ, buf, buflen);
1578 print_signal_handler(st, SIGILL , buf, buflen);
1579 print_signal_handler(st, SR_signum, buf, buflen);
1580 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1581 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1582 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1583 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1584 print_signal_handler(st, SIGTRAP, buf, buflen);
1585 print_signal_handler(st, SIGDANGER, buf, buflen);
1586 }
1587
1588 static char saved_jvm_path[MAXPATHLEN] = {0};
1589
1590 // Find the full path to the current module, libjvm.so.
1591 void os::jvm_path(char *buf, jint buflen) {
1592 // Error checking.
1593 if (buflen < MAXPATHLEN) {
1594 assert(false, "must use a large-enough buffer");
1595 buf[0] = '\0';
1596 return;
1597 }
1598 // Lazy resolve the path to current module.
1599 if (saved_jvm_path[0] != 0) {
1600 strcpy(buf, saved_jvm_path);
1601 return;
1602 }
1603
1604 Dl_info dlinfo;
1605 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1606 assert(ret != 0, "cannot locate libjvm");
1607 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1608 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1609
1610 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1611 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1612 }
1613
1614 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1615 // no prefix required, not even "_"
1616 }
1617
1618 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1619 // no suffix required
1620 }
1621
1622 ////////////////////////////////////////////////////////////////////////////////
1623 // sun.misc.Signal support
1624
1625 static volatile jint sigint_count = 0;
1626
1627 static void
1628 UserHandler(int sig, void *siginfo, void *context) {
1629 // 4511530 - sem_post is serialized and handled by the manager thread. When
1630 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1631 // don't want to flood the manager thread with sem_post requests.
1632 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1633 return;
1634
1635 // Ctrl-C is pressed during error reporting, likely because the error
1636 // handler fails to abort. Let VM die immediately.
1637 if (sig == SIGINT && is_error_reported()) {
1638 os::die();
1639 }
1640
1641 os::signal_notify(sig);
1642 }
1643
1644 void* os::user_handler() {
1645 return CAST_FROM_FN_PTR(void*, UserHandler);
1646 }
1647
1648 extern "C" {
1649 typedef void (*sa_handler_t)(int);
1650 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1651 }
1652
1653 void* os::signal(int signal_number, void* handler) {
1654 struct sigaction sigAct, oldSigAct;
1655
1656 sigfillset(&(sigAct.sa_mask));
1657
1658 // Do not block out synchronous signals in the signal handler.
1659 // Blocking synchronous signals only makes sense if you can really
1660 // be sure that those signals won't happen during signal handling,
1661 // when the blocking applies. Normal signal handlers are lean and
1662 // do not cause signals. But our signal handlers tend to be "risky"
1663 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1664 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1665 // by a SIGILL, which was blocked due to the signal mask. The process
1666 // just hung forever. Better to crash from a secondary signal than to hang.
1667 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1668 sigdelset(&(sigAct.sa_mask), SIGBUS);
1669 sigdelset(&(sigAct.sa_mask), SIGILL);
1670 sigdelset(&(sigAct.sa_mask), SIGFPE);
1671 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1672
1673 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1674
1675 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1676
1677 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1678 // -1 means registration failed
1679 return (void *)-1;
1680 }
1681
1682 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1683 }
1684
1685 void os::signal_raise(int signal_number) {
1686 ::raise(signal_number);
1687 }
1688
1689 //
1690 // The following code is moved from os.cpp for making this
1691 // code platform specific, which it is by its very nature.
1692 //
1693
1694 // Will be modified when max signal is changed to be dynamic
1695 int os::sigexitnum_pd() {
1696 return NSIG;
1697 }
1698
1699 // a counter for each possible signal value
1700 static volatile jint pending_signals[NSIG+1] = { 0 };
1701
1702 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1703 // On AIX, we use sem_init(), sem_post(), sem_wait()
1704 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1705 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1706 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1707 // on AIX, msem_..() calls are suspected of causing problems.
1708 static sem_t sig_sem;
1709 static msemaphore* p_sig_msem = 0;
1710
1711 static void local_sem_init() {
1712 if (os::Aix::on_aix()) {
1713 int rc = ::sem_init(&sig_sem, 0, 0);
1714 guarantee(rc != -1, "sem_init failed");
1715 } else {
1716 // Memory semaphores must live in shared mem.
1717 guarantee0(p_sig_msem == NULL);
1718 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1719 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1720 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1721 }
1722 }
1723
1724 static void local_sem_post() {
1725 static bool warn_only_once = false;
1726 if (os::Aix::on_aix()) {
1727 int rc = ::sem_post(&sig_sem);
1728 if (rc == -1 && !warn_only_once) {
1729 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1730 warn_only_once = true;
1731 }
1732 } else {
1733 guarantee0(p_sig_msem != NULL);
1734 int rc = ::msem_unlock(p_sig_msem, 0);
1735 if (rc == -1 && !warn_only_once) {
1736 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1737 warn_only_once = true;
1738 }
1739 }
1740 }
1741
1742 static void local_sem_wait() {
1743 static bool warn_only_once = false;
1744 if (os::Aix::on_aix()) {
1745 int rc = ::sem_wait(&sig_sem);
1746 if (rc == -1 && !warn_only_once) {
1747 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1748 warn_only_once = true;
1749 }
1750 } else {
1751 guarantee0(p_sig_msem != NULL); // must init before use
1752 int rc = ::msem_lock(p_sig_msem, 0);
1753 if (rc == -1 && !warn_only_once) {
1754 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1755 warn_only_once = true;
1756 }
1757 }
1758 }
1759
1760 void os::signal_init_pd() {
1761 // Initialize signal structures
1762 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1763
1764 // Initialize signal semaphore
1765 local_sem_init();
1766 }
1767
1768 void os::signal_notify(int sig) {
1769 Atomic::inc(&pending_signals[sig]);
1770 local_sem_post();
1771 }
1772
1773 static int check_pending_signals(bool wait) {
1774 Atomic::store(0, &sigint_count);
1775 for (;;) {
1776 for (int i = 0; i < NSIG + 1; i++) {
1777 jint n = pending_signals[i];
1778 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1779 return i;
1780 }
1781 }
1782 if (!wait) {
1783 return -1;
1784 }
1785 JavaThread *thread = JavaThread::current();
1786 ThreadBlockInVM tbivm(thread);
1787
1788 bool threadIsSuspended;
1789 do {
1790 thread->set_suspend_equivalent();
1791 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1792
1793 local_sem_wait();
1794
1795 // were we externally suspended while we were waiting?
1796 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1797 if (threadIsSuspended) {
1798 //
1799 // The semaphore has been incremented, but while we were waiting
1800 // another thread suspended us. We don't want to continue running
1801 // while suspended because that would surprise the thread that
1802 // suspended us.
1803 //
1804
1805 local_sem_post();
1806
1807 thread->java_suspend_self();
1808 }
1809 } while (threadIsSuspended);
1810 }
1811 }
1812
1813 int os::signal_lookup() {
1814 return check_pending_signals(false);
1815 }
1816
1817 int os::signal_wait() {
1818 return check_pending_signals(true);
1819 }
1820
1821 ////////////////////////////////////////////////////////////////////////////////
1822 // Virtual Memory
1823
1824 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1825
1826 #define VMEM_MAPPED 1
1827 #define VMEM_SHMATED 2
1828
1829 struct vmembk_t {
1830 int type; // 1 - mmap, 2 - shmat
1831 char* addr;
1832 size_t size; // Real size, may be larger than usersize.
1833 size_t pagesize; // page size of area
1834 vmembk_t* next;
1835
1836 bool contains_addr(char* p) const {
1837 return p >= addr && p < (addr + size);
1838 }
1839
1840 bool contains_range(char* p, size_t s) const {
1841 return contains_addr(p) && contains_addr(p + s - 1);
1842 }
1843
1844 void print_on(outputStream* os) const {
1845 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1846 " bytes, %d %s pages), %s",
1847 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1848 (type == VMEM_SHMATED ? "shmat" : "mmap")
1849 );
1850 }
1851
1852 // Check that range is a sub range of memory block (or equal to memory block);
1853 // also check that range is fully page aligned to the page size if the block.
1854 void assert_is_valid_subrange(char* p, size_t s) const {
1855 if (!contains_range(p, s)) {
1856 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1857 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1858 p, p + s, addr, addr + size);
1859 guarantee0(false);
1860 }
1861 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1862 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1863 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1864 guarantee0(false);
1865 }
1866 }
1867 };
1868
1869 static struct {
1870 vmembk_t* first;
1871 MiscUtils::CritSect cs;
1872 } vmem;
1873
1874 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1875 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1876 assert0(p);
1877 if (p) {
1878 MiscUtils::AutoCritSect lck(&vmem.cs);
1879 p->addr = addr; p->size = size;
1880 p->pagesize = pagesize;
1881 p->type = type;
1882 p->next = vmem.first;
1883 vmem.first = p;
1884 }
1885 }
1886
1887 static vmembk_t* vmembk_find(char* addr) {
1888 MiscUtils::AutoCritSect lck(&vmem.cs);
1889 for (vmembk_t* p = vmem.first; p; p = p->next) {
1890 if (p->addr <= addr && (p->addr + p->size) > addr) {
1891 return p;
1892 }
1893 }
1894 return NULL;
1895 }
1896
1897 static void vmembk_remove(vmembk_t* p0) {
1898 MiscUtils::AutoCritSect lck(&vmem.cs);
1899 assert0(p0);
1900 assert0(vmem.first); // List should not be empty.
1901 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1902 if (*pp == p0) {
1903 *pp = p0->next;
1904 ::free(p0);
1905 return;
1906 }
1907 }
1908 assert0(false); // Not found?
1909 }
1910
1911 static void vmembk_print_on(outputStream* os) {
1912 MiscUtils::AutoCritSect lck(&vmem.cs);
1913 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1914 vmi->print_on(os);
1915 os->cr();
1916 }
1917 }
1918
1919 // Reserve and attach a section of System V memory.
1920 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1921 // address. Failing that, it will attach the memory anywhere.
1922 // If <requested_addr> is NULL, function will attach the memory anywhere.
1923 //
1924 // <alignment_hint> is being ignored by this function. It is very probable however that the
1925 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1926 // Should this be not enogh, we can put more work into it.
1927 static char* reserve_shmated_memory (
1928 size_t bytes,
1929 char* requested_addr,
1930 size_t alignment_hint) {
1931
1932 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1933 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1934 bytes, requested_addr, alignment_hint);
1935
1936 // Either give me wish address or wish alignment but not both.
1937 assert0(!(requested_addr != NULL && alignment_hint != 0));
1938
1939 // We must prevent anyone from attaching too close to the
1940 // BRK because that may cause malloc OOM.
1941 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1942 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1943 "Will attach anywhere.", requested_addr);
1944 // Act like the OS refused to attach there.
1945 requested_addr = NULL;
1946 }
1947
1948 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1949 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1950 if (os::Aix::on_pase_V5R4_or_older()) {
1951 ShouldNotReachHere();
1952 }
1953
1954 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1955 const size_t size = align_size_up(bytes, SIZE_64K);
1956
1957 // Reserve the shared segment.
1958 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1959 if (shmid == -1) {
1960 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1961 return NULL;
1962 }
1963
1964 // Important note:
1965 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1966 // We must right after attaching it remove it from the system. System V shm segments are global and
1967 // survive the process.
1968 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1969
1970 struct shmid_ds shmbuf;
1971 memset(&shmbuf, 0, sizeof(shmbuf));
1972 shmbuf.shm_pagesize = SIZE_64K;
1973 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1974 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1975 size / SIZE_64K, errno);
1976 // I want to know if this ever happens.
1977 assert(false, "failed to set page size for shmat");
1978 }
1979
1980 // Now attach the shared segment.
1981 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1982 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1983 // were not a segment boundary.
1984 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1985 const int errno_shmat = errno;
1986
1987 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1988 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
1989 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
1990 assert(false, "failed to remove shared memory segment!");
1991 }
1992
1993 // Handle shmat error. If we failed to attach, just return.
1994 if (addr == (char*)-1) {
1995 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
1996 return NULL;
1997 }
1998
1999 // Just for info: query the real page size. In case setting the page size did not
2000 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2001 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2002 if (real_pagesize != shmbuf.shm_pagesize) {
2003 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2004 }
2005
2006 if (addr) {
2007 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2008 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2009 } else {
2010 if (requested_addr != NULL) {
2011 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2012 } else {
2013 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2014 }
2015 }
2016
2017 // book-keeping
2018 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2019 assert0(is_aligned_to(addr, os::vm_page_size()));
2020
2021 return addr;
2022 }
2023
2024 static bool release_shmated_memory(char* addr, size_t size) {
2025
2026 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2027 addr, addr + size - 1);
2028
2029 bool rc = false;
2030
2031 // TODO: is there a way to verify shm size without doing bookkeeping?
2032 if (::shmdt(addr) != 0) {
2033 trcVerbose("error (%d).", errno);
2034 } else {
2035 trcVerbose("ok.");
2036 rc = true;
2037 }
2038 return rc;
2039 }
2040
2041 static bool uncommit_shmated_memory(char* addr, size_t size) {
2042 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2043 addr, addr + size - 1);
2044
2045 const bool rc = my_disclaim64(addr, size);
2046
2047 if (!rc) {
2048 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2049 return false;
2050 }
2051 return true;
2052 }
2053
2054 //////////////////////////////// mmap-based routines /////////////////////////////////
2055
2056 // Reserve memory via mmap.
2057 // If <requested_addr> is given, an attempt is made to attach at the given address.
2058 // Failing that, memory is allocated at any address.
2059 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2060 // allocate at an address aligned with the given alignment. Failing that, memory
2061 // is aligned anywhere.
2062 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2063 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2064 "alignment_hint " UINTX_FORMAT "...",
2065 bytes, requested_addr, alignment_hint);
2066
2067 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2068 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2069 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2070 return NULL;
2071 }
2072
2073 // We must prevent anyone from attaching too close to the
2074 // BRK because that may cause malloc OOM.
2075 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2076 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2077 "Will attach anywhere.", requested_addr);
2078 // Act like the OS refused to attach there.
2079 requested_addr = NULL;
2080 }
2081
2082 // Specify one or the other but not both.
2083 assert0(!(requested_addr != NULL && alignment_hint > 0));
2084
2085 // In 64K mode, we claim the global page size (os::vm_page_size())
2086 // is 64K. This is one of the few points where that illusion may
2087 // break, because mmap() will always return memory aligned to 4K. So
2088 // we must ensure we only ever return memory aligned to 64k.
2089 if (alignment_hint) {
2090 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2091 } else {
2092 alignment_hint = os::vm_page_size();
2093 }
2094
2095 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2096 const size_t size = align_size_up(bytes, os::vm_page_size());
2097
2098 // alignment: Allocate memory large enough to include an aligned range of the right size and
2099 // cut off the leading and trailing waste pages.
2100 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2101 const size_t extra_size = size + alignment_hint;
2102
2103 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2104 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2105 int flags = MAP_ANONYMOUS | MAP_SHARED;
2106
2107 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2108 // it means if wishaddress is given but MAP_FIXED is not set.
2109 //
2110 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2111 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2112 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2113 // get clobbered.
2114 if (requested_addr != NULL) {
2115 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2116 flags |= MAP_FIXED;
2117 }
2118 }
2119
2120 char* addr = (char*)::mmap(requested_addr, extra_size,
2121 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2122
2123 if (addr == MAP_FAILED) {
2124 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2125 return NULL;
2126 }
2127
2128 // Handle alignment.
2129 char* const addr_aligned = (char *)align_ptr_up(addr, alignment_hint);
2130 const size_t waste_pre = addr_aligned - addr;
2131 char* const addr_aligned_end = addr_aligned + size;
2132 const size_t waste_post = extra_size - waste_pre - size;
2133 if (waste_pre > 0) {
2134 ::munmap(addr, waste_pre);
2135 }
2136 if (waste_post > 0) {
2137 ::munmap(addr_aligned_end, waste_post);
2138 }
2139 addr = addr_aligned;
2140
2141 if (addr) {
2142 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2143 addr, addr + bytes, bytes);
2144 } else {
2145 if (requested_addr != NULL) {
2146 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2147 } else {
2148 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2149 }
2150 }
2151
2152 // bookkeeping
2153 vmembk_add(addr, size, SIZE_4K, VMEM_MAPPED);
2154
2155 // Test alignment, see above.
2156 assert0(is_aligned_to(addr, os::vm_page_size()));
2157
2158 return addr;
2159 }
2160
2161 static bool release_mmaped_memory(char* addr, size_t size) {
2162 assert0(is_aligned_to(addr, os::vm_page_size()));
2163 assert0(is_aligned_to(size, os::vm_page_size()));
2164
2165 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2166 addr, addr + size - 1);
2167 bool rc = false;
2168
2169 if (::munmap(addr, size) != 0) {
2170 trcVerbose("failed (%d)\n", errno);
2171 rc = false;
2172 } else {
2173 trcVerbose("ok.");
2174 rc = true;
2175 }
2176
2177 return rc;
2178 }
2179
2180 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2181
2182 assert0(is_aligned_to(addr, os::vm_page_size()));
2183 assert0(is_aligned_to(size, os::vm_page_size()));
2184
2185 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2186 addr, addr + size - 1);
2187 bool rc = false;
2188
2189 // Uncommit mmap memory with msync MS_INVALIDATE.
2190 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2191 trcVerbose("failed (%d)\n", errno);
2192 rc = false;
2193 } else {
2194 trcVerbose("ok.");
2195 rc = true;
2196 }
2197
2198 return rc;
2199 }
2200
2201 int os::vm_page_size() {
2202 // Seems redundant as all get out.
2203 assert(os::Aix::page_size() != -1, "must call os::init");
2204 return os::Aix::page_size();
2205 }
2206
2207 // Aix allocates memory by pages.
2208 int os::vm_allocation_granularity() {
2209 assert(os::Aix::page_size() != -1, "must call os::init");
2210 return os::Aix::page_size();
2211 }
2212
2213 #ifdef PRODUCT
2214 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2215 int err) {
2216 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2217 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2218 os::errno_name(err), err);
2219 }
2220 #endif
2221
2222 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2223 const char* mesg) {
2224 assert(mesg != NULL, "mesg must be specified");
2225 if (!pd_commit_memory(addr, size, exec)) {
2226 // Add extra info in product mode for vm_exit_out_of_memory():
2227 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2228 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2229 }
2230 }
2231
2232 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2233
2234 assert(is_aligned_to(addr, os::vm_page_size()),
2235 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2236 p2i(addr), os::vm_page_size());
2237 assert(is_aligned_to(size, os::vm_page_size()),
2238 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2239 size, os::vm_page_size());
2240
2241 vmembk_t* const vmi = vmembk_find(addr);
2242 guarantee0(vmi);
2243 vmi->assert_is_valid_subrange(addr, size);
2244
2245 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2246
2247 if (UseExplicitCommit) {
2248 // AIX commits memory on touch. So, touch all pages to be committed.
2249 for (char* p = addr; p < (addr + size); p += SIZE_4K) {
2250 *p = '\0';
2251 }
2252 }
2253
2254 return true;
2255 }
2256
2257 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2258 return pd_commit_memory(addr, size, exec);
2259 }
2260
2261 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2262 size_t alignment_hint, bool exec,
2263 const char* mesg) {
2264 // Alignment_hint is ignored on this OS.
2265 pd_commit_memory_or_exit(addr, size, exec, mesg);
2266 }
2267
2268 bool os::pd_uncommit_memory(char* addr, size_t size) {
2269 assert(is_aligned_to(addr, os::vm_page_size()),
2270 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2271 p2i(addr), os::vm_page_size());
2272 assert(is_aligned_to(size, os::vm_page_size()),
2273 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2274 size, os::vm_page_size());
2275
2276 // Dynamically do different things for mmap/shmat.
2277 const vmembk_t* const vmi = vmembk_find(addr);
2278 guarantee0(vmi);
2279 vmi->assert_is_valid_subrange(addr, size);
2280
2281 if (vmi->type == VMEM_SHMATED) {
2282 return uncommit_shmated_memory(addr, size);
2283 } else {
2284 return uncommit_mmaped_memory(addr, size);
2285 }
2286 }
2287
2288 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2289 // Do not call this; no need to commit stack pages on AIX.
2290 ShouldNotReachHere();
2291 return true;
2292 }
2293
2294 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2295 // Do not call this; no need to commit stack pages on AIX.
2296 ShouldNotReachHere();
2297 return true;
2298 }
2299
2300 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2301 }
2302
2303 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2304 }
2305
2306 void os::numa_make_global(char *addr, size_t bytes) {
2307 }
2308
2309 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2310 }
2311
2312 bool os::numa_topology_changed() {
2313 return false;
2314 }
2315
2316 size_t os::numa_get_groups_num() {
2317 return 1;
2318 }
2319
2320 int os::numa_get_group_id() {
2321 return 0;
2322 }
2323
2324 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2325 if (size > 0) {
2326 ids[0] = 0;
2327 return 1;
2328 }
2329 return 0;
2330 }
2331
2332 bool os::get_page_info(char *start, page_info* info) {
2333 return false;
2334 }
2335
2336 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2337 return end;
2338 }
2339
2340 // Reserves and attaches a shared memory segment.
2341 // Will assert if a wish address is given and could not be obtained.
2342 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2343
2344 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2345 // thereby clobbering old mappings at that place. That is probably
2346 // not intended, never used and almost certainly an error were it
2347 // ever be used this way (to try attaching at a specified address
2348 // without clobbering old mappings an alternate API exists,
2349 // os::attempt_reserve_memory_at()).
2350 // Instead of mimicking the dangerous coding of the other platforms, here I
2351 // just ignore the request address (release) or assert(debug).
2352 assert0(requested_addr == NULL);
2353
2354 // Always round to os::vm_page_size(), which may be larger than 4K.
2355 bytes = align_size_up(bytes, os::vm_page_size());
2356 const size_t alignment_hint0 =
2357 alignment_hint ? align_size_up(alignment_hint, os::vm_page_size()) : 0;
2358
2359 // In 4K mode always use mmap.
2360 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2361 if (os::vm_page_size() == SIZE_4K) {
2362 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2363 } else {
2364 if (bytes >= Use64KPagesThreshold) {
2365 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2366 } else {
2367 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2368 }
2369 }
2370 }
2371
2372 bool os::pd_release_memory(char* addr, size_t size) {
2373
2374 // Dynamically do different things for mmap/shmat.
2375 vmembk_t* const vmi = vmembk_find(addr);
2376 guarantee0(vmi);
2377
2378 // Always round to os::vm_page_size(), which may be larger than 4K.
2379 size = align_size_up(size, os::vm_page_size());
2380 addr = (char *)align_ptr_up(addr, os::vm_page_size());
2381
2382 bool rc = false;
2383 bool remove_bookkeeping = false;
2384 if (vmi->type == VMEM_SHMATED) {
2385 // For shmatted memory, we do:
2386 // - If user wants to release the whole range, release the memory (shmdt).
2387 // - If user only wants to release a partial range, uncommit (disclaim) that
2388 // range. That way, at least, we do not use memory anymore (bust still page
2389 // table space).
2390 vmi->assert_is_valid_subrange(addr, size);
2391 if (addr == vmi->addr && size == vmi->size) {
2392 rc = release_shmated_memory(addr, size);
2393 remove_bookkeeping = true;
2394 } else {
2395 rc = uncommit_shmated_memory(addr, size);
2396 }
2397 } else {
2398 // User may unmap partial regions but region has to be fully contained.
2399 #ifdef ASSERT
2400 vmi->assert_is_valid_subrange(addr, size);
2401 #endif
2402 rc = release_mmaped_memory(addr, size);
2403 remove_bookkeeping = true;
2404 }
2405
2406 // update bookkeeping
2407 if (rc && remove_bookkeeping) {
2408 vmembk_remove(vmi);
2409 }
2410
2411 return rc;
2412 }
2413
2414 static bool checked_mprotect(char* addr, size_t size, int prot) {
2415
2416 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2417 // not tell me if protection failed when trying to protect an un-protectable range.
2418 //
2419 // This means if the memory was allocated using shmget/shmat, protection wont work
2420 // but mprotect will still return 0:
2421 //
2422 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2423
2424 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2425
2426 if (!rc) {
2427 const char* const s_errno = os::errno_name(errno);
2428 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2429 return false;
2430 }
2431
2432 // mprotect success check
2433 //
2434 // Mprotect said it changed the protection but can I believe it?
2435 //
2436 // To be sure I need to check the protection afterwards. Try to
2437 // read from protected memory and check whether that causes a segfault.
2438 //
2439 if (!os::Aix::xpg_sus_mode()) {
2440
2441 if (CanUseSafeFetch32()) {
2442
2443 const bool read_protected =
2444 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2445 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2446
2447 if (prot & PROT_READ) {
2448 rc = !read_protected;
2449 } else {
2450 rc = read_protected;
2451 }
2452
2453 if (!rc) {
2454 if (os::Aix::on_pase()) {
2455 // There is an issue on older PASE systems where mprotect() will return success but the
2456 // memory will not be protected.
2457 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2458 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2459 // a stack. It is an OS error.
2460 //
2461 // A valid strategy is just to try again. This usually works. :-/
2462
2463 ::usleep(1000);
2464 if (::mprotect(addr, size, prot) == 0) {
2465 const bool read_protected_2 =
2466 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2467 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2468 rc = true;
2469 }
2470 }
2471 }
2472 }
2473 }
2474
2475 assert(rc == true, "mprotect failed.");
2476
2477 return rc;
2478 }
2479
2480 // Set protections specified
2481 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2482 unsigned int p = 0;
2483 switch (prot) {
2484 case MEM_PROT_NONE: p = PROT_NONE; break;
2485 case MEM_PROT_READ: p = PROT_READ; break;
2486 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2487 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2488 default:
2489 ShouldNotReachHere();
2490 }
2491 // is_committed is unused.
2492 return checked_mprotect(addr, size, p);
2493 }
2494
2495 bool os::guard_memory(char* addr, size_t size) {
2496 return checked_mprotect(addr, size, PROT_NONE);
2497 }
2498
2499 bool os::unguard_memory(char* addr, size_t size) {
2500 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2501 }
2502
2503 // Large page support
2504
2505 static size_t _large_page_size = 0;
2506
2507 // Enable large page support if OS allows that.
2508 void os::large_page_init() {
2509 return; // Nothing to do. See query_multipage_support and friends.
2510 }
2511
2512 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2513 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2514 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2515 // so this is not needed.
2516 assert(false, "should not be called on AIX");
2517 return NULL;
2518 }
2519
2520 bool os::release_memory_special(char* base, size_t bytes) {
2521 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2522 Unimplemented();
2523 return false;
2524 }
2525
2526 size_t os::large_page_size() {
2527 return _large_page_size;
2528 }
2529
2530 bool os::can_commit_large_page_memory() {
2531 // Does not matter, we do not support huge pages.
2532 return false;
2533 }
2534
2535 bool os::can_execute_large_page_memory() {
2536 // Does not matter, we do not support huge pages.
2537 return false;
2538 }
2539
2540 // Reserve memory at an arbitrary address, only if that area is
2541 // available (and not reserved for something else).
2542 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2543 char* addr = NULL;
2544
2545 // Always round to os::vm_page_size(), which may be larger than 4K.
2546 bytes = align_size_up(bytes, os::vm_page_size());
2547
2548 // In 4K mode always use mmap.
2549 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2550 if (os::vm_page_size() == SIZE_4K) {
2551 return reserve_mmaped_memory(bytes, requested_addr, 0);
2552 } else {
2553 if (bytes >= Use64KPagesThreshold) {
2554 return reserve_shmated_memory(bytes, requested_addr, 0);
2555 } else {
2556 return reserve_mmaped_memory(bytes, requested_addr, 0);
2557 }
2558 }
2559
2560 return addr;
2561 }
2562
2563 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2564 return ::read(fd, buf, nBytes);
2565 }
2566
2567 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2568 return ::pread(fd, buf, nBytes, offset);
2569 }
2570
2571 void os::naked_short_sleep(jlong ms) {
2572 struct timespec req;
2573
2574 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2575 req.tv_sec = 0;
2576 if (ms > 0) {
2577 req.tv_nsec = (ms % 1000) * 1000000;
2578 }
2579 else {
2580 req.tv_nsec = 1;
2581 }
2582
2583 nanosleep(&req, NULL);
2584
2585 return;
2586 }
2587
2588 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2589 void os::infinite_sleep() {
2590 while (true) { // sleep forever ...
2591 ::sleep(100); // ... 100 seconds at a time
2592 }
2593 }
2594
2595 // Used to convert frequent JVM_Yield() to nops
2596 bool os::dont_yield() {
2597 return DontYieldALot;
2598 }
2599
2600 void os::naked_yield() {
2601 sched_yield();
2602 }
2603
2604 ////////////////////////////////////////////////////////////////////////////////
2605 // thread priority support
2606
2607 // From AIX manpage to pthread_setschedparam
2608 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2609 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2610 //
2611 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2612 // range from 40 to 80, where 40 is the least favored priority and 80
2613 // is the most favored."
2614 //
2615 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2616 // scheduling there; however, this still leaves iSeries.)
2617 //
2618 // We use the same values for AIX and PASE.
2619 int os::java_to_os_priority[CriticalPriority + 1] = {
2620 54, // 0 Entry should never be used
2621
2622 55, // 1 MinPriority
2623 55, // 2
2624 56, // 3
2625
2626 56, // 4
2627 57, // 5 NormPriority
2628 57, // 6
2629
2630 58, // 7
2631 58, // 8
2632 59, // 9 NearMaxPriority
2633
2634 60, // 10 MaxPriority
2635
2636 60 // 11 CriticalPriority
2637 };
2638
2639 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2640 if (!UseThreadPriorities) return OS_OK;
2641 pthread_t thr = thread->osthread()->pthread_id();
2642 int policy = SCHED_OTHER;
2643 struct sched_param param;
2644 param.sched_priority = newpri;
2645 int ret = pthread_setschedparam(thr, policy, ¶m);
2646
2647 if (ret != 0) {
2648 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2649 (int)thr, newpri, ret, os::errno_name(ret));
2650 }
2651 return (ret == 0) ? OS_OK : OS_ERR;
2652 }
2653
2654 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2655 if (!UseThreadPriorities) {
2656 *priority_ptr = java_to_os_priority[NormPriority];
2657 return OS_OK;
2658 }
2659 pthread_t thr = thread->osthread()->pthread_id();
2660 int policy = SCHED_OTHER;
2661 struct sched_param param;
2662 int ret = pthread_getschedparam(thr, &policy, ¶m);
2663 *priority_ptr = param.sched_priority;
2664
2665 return (ret == 0) ? OS_OK : OS_ERR;
2666 }
2667
2668 // Hint to the underlying OS that a task switch would not be good.
2669 // Void return because it's a hint and can fail.
2670 void os::hint_no_preempt() {}
2671
2672 ////////////////////////////////////////////////////////////////////////////////
2673 // suspend/resume support
2674
2675 // the low-level signal-based suspend/resume support is a remnant from the
2676 // old VM-suspension that used to be for java-suspension, safepoints etc,
2677 // within hotspot. Now there is a single use-case for this:
2678 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2679 // that runs in the watcher thread.
2680 // The remaining code is greatly simplified from the more general suspension
2681 // code that used to be used.
2682 //
2683 // The protocol is quite simple:
2684 // - suspend:
2685 // - sends a signal to the target thread
2686 // - polls the suspend state of the osthread using a yield loop
2687 // - target thread signal handler (SR_handler) sets suspend state
2688 // and blocks in sigsuspend until continued
2689 // - resume:
2690 // - sets target osthread state to continue
2691 // - sends signal to end the sigsuspend loop in the SR_handler
2692 //
2693 // Note that the SR_lock plays no role in this suspend/resume protocol.
2694 //
2695
2696 static void resume_clear_context(OSThread *osthread) {
2697 osthread->set_ucontext(NULL);
2698 osthread->set_siginfo(NULL);
2699 }
2700
2701 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2702 osthread->set_ucontext(context);
2703 osthread->set_siginfo(siginfo);
2704 }
2705
2706 //
2707 // Handler function invoked when a thread's execution is suspended or
2708 // resumed. We have to be careful that only async-safe functions are
2709 // called here (Note: most pthread functions are not async safe and
2710 // should be avoided.)
2711 //
2712 // Note: sigwait() is a more natural fit than sigsuspend() from an
2713 // interface point of view, but sigwait() prevents the signal hander
2714 // from being run. libpthread would get very confused by not having
2715 // its signal handlers run and prevents sigwait()'s use with the
2716 // mutex granting granting signal.
2717 //
2718 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2719 //
2720 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2721 // Save and restore errno to avoid confusing native code with EINTR
2722 // after sigsuspend.
2723 int old_errno = errno;
2724
2725 Thread* thread = Thread::current();
2726 OSThread* osthread = thread->osthread();
2727 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2728
2729 os::SuspendResume::State current = osthread->sr.state();
2730 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2731 suspend_save_context(osthread, siginfo, context);
2732
2733 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2734 os::SuspendResume::State state = osthread->sr.suspended();
2735 if (state == os::SuspendResume::SR_SUSPENDED) {
2736 sigset_t suspend_set; // signals for sigsuspend()
2737
2738 // get current set of blocked signals and unblock resume signal
2739 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2740 sigdelset(&suspend_set, SR_signum);
2741
2742 // wait here until we are resumed
2743 while (1) {
2744 sigsuspend(&suspend_set);
2745
2746 os::SuspendResume::State result = osthread->sr.running();
2747 if (result == os::SuspendResume::SR_RUNNING) {
2748 break;
2749 }
2750 }
2751
2752 } else if (state == os::SuspendResume::SR_RUNNING) {
2753 // request was cancelled, continue
2754 } else {
2755 ShouldNotReachHere();
2756 }
2757
2758 resume_clear_context(osthread);
2759 } else if (current == os::SuspendResume::SR_RUNNING) {
2760 // request was cancelled, continue
2761 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2762 // ignore
2763 } else {
2764 ShouldNotReachHere();
2765 }
2766
2767 errno = old_errno;
2768 }
2769
2770 static int SR_initialize() {
2771 struct sigaction act;
2772 char *s;
2773 // Get signal number to use for suspend/resume
2774 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2775 int sig = ::strtol(s, 0, 10);
2776 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2777 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2778 SR_signum = sig;
2779 } else {
2780 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2781 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2782 }
2783 }
2784
2785 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2786 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2787
2788 sigemptyset(&SR_sigset);
2789 sigaddset(&SR_sigset, SR_signum);
2790
2791 // Set up signal handler for suspend/resume.
2792 act.sa_flags = SA_RESTART|SA_SIGINFO;
2793 act.sa_handler = (void (*)(int)) SR_handler;
2794
2795 // SR_signum is blocked by default.
2796 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2797
2798 if (sigaction(SR_signum, &act, 0) == -1) {
2799 return -1;
2800 }
2801
2802 // Save signal flag
2803 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2804 return 0;
2805 }
2806
2807 static int SR_finalize() {
2808 return 0;
2809 }
2810
2811 static int sr_notify(OSThread* osthread) {
2812 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2813 assert_status(status == 0, status, "pthread_kill");
2814 return status;
2815 }
2816
2817 // "Randomly" selected value for how long we want to spin
2818 // before bailing out on suspending a thread, also how often
2819 // we send a signal to a thread we want to resume
2820 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2821 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2822
2823 // returns true on success and false on error - really an error is fatal
2824 // but this seems the normal response to library errors
2825 static bool do_suspend(OSThread* osthread) {
2826 assert(osthread->sr.is_running(), "thread should be running");
2827 // mark as suspended and send signal
2828
2829 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2830 // failed to switch, state wasn't running?
2831 ShouldNotReachHere();
2832 return false;
2833 }
2834
2835 if (sr_notify(osthread) != 0) {
2836 // try to cancel, switch to running
2837
2838 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2839 if (result == os::SuspendResume::SR_RUNNING) {
2840 // cancelled
2841 return false;
2842 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2843 // somehow managed to suspend
2844 return true;
2845 } else {
2846 ShouldNotReachHere();
2847 return false;
2848 }
2849 }
2850
2851 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2852
2853 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2854 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2855 os::naked_yield();
2856 }
2857
2858 // timeout, try to cancel the request
2859 if (n >= RANDOMLY_LARGE_INTEGER) {
2860 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2861 if (cancelled == os::SuspendResume::SR_RUNNING) {
2862 return false;
2863 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2864 return true;
2865 } else {
2866 ShouldNotReachHere();
2867 return false;
2868 }
2869 }
2870 }
2871
2872 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2873 return true;
2874 }
2875
2876 static void do_resume(OSThread* osthread) {
2877 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2878
2879 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2880 // failed to switch to WAKEUP_REQUEST
2881 ShouldNotReachHere();
2882 return;
2883 }
2884
2885 while (!osthread->sr.is_running()) {
2886 if (sr_notify(osthread) == 0) {
2887 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2888 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2889 os::naked_yield();
2890 }
2891 }
2892 } else {
2893 ShouldNotReachHere();
2894 }
2895 }
2896
2897 guarantee(osthread->sr.is_running(), "Must be running!");
2898 }
2899
2900 ///////////////////////////////////////////////////////////////////////////////////
2901 // signal handling (except suspend/resume)
2902
2903 // This routine may be used by user applications as a "hook" to catch signals.
2904 // The user-defined signal handler must pass unrecognized signals to this
2905 // routine, and if it returns true (non-zero), then the signal handler must
2906 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2907 // routine will never retun false (zero), but instead will execute a VM panic
2908 // routine kill the process.
2909 //
2910 // If this routine returns false, it is OK to call it again. This allows
2911 // the user-defined signal handler to perform checks either before or after
2912 // the VM performs its own checks. Naturally, the user code would be making
2913 // a serious error if it tried to handle an exception (such as a null check
2914 // or breakpoint) that the VM was generating for its own correct operation.
2915 //
2916 // This routine may recognize any of the following kinds of signals:
2917 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2918 // It should be consulted by handlers for any of those signals.
2919 //
2920 // The caller of this routine must pass in the three arguments supplied
2921 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2922 // field of the structure passed to sigaction(). This routine assumes that
2923 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2924 //
2925 // Note that the VM will print warnings if it detects conflicting signal
2926 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2927 //
2928 extern "C" JNIEXPORT int
2929 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2930
2931 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2932 // to be the thing to call; documentation is not terribly clear about whether
2933 // pthread_sigmask also works, and if it does, whether it does the same.
2934 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2935 const int rc = ::pthread_sigmask(how, set, oset);
2936 // return value semantics differ slightly for error case:
2937 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2938 // (so, pthread_sigmask is more theadsafe for error handling)
2939 // But success is always 0.
2940 return rc == 0 ? true : false;
2941 }
2942
2943 // Function to unblock all signals which are, according
2944 // to POSIX, typical program error signals. If they happen while being blocked,
2945 // they typically will bring down the process immediately.
2946 bool unblock_program_error_signals() {
2947 sigset_t set;
2948 ::sigemptyset(&set);
2949 ::sigaddset(&set, SIGILL);
2950 ::sigaddset(&set, SIGBUS);
2951 ::sigaddset(&set, SIGFPE);
2952 ::sigaddset(&set, SIGSEGV);
2953 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2954 }
2955
2956 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2957 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2958 assert(info != NULL && uc != NULL, "it must be old kernel");
2959
2960 // Never leave program error signals blocked;
2961 // on all our platforms they would bring down the process immediately when
2962 // getting raised while being blocked.
2963 unblock_program_error_signals();
2964
2965 int orig_errno = errno; // Preserve errno value over signal handler.
2966 JVM_handle_aix_signal(sig, info, uc, true);
2967 errno = orig_errno;
2968 }
2969
2970 // This boolean allows users to forward their own non-matching signals
2971 // to JVM_handle_aix_signal, harmlessly.
2972 bool os::Aix::signal_handlers_are_installed = false;
2973
2974 // For signal-chaining
2975 struct sigaction sigact[NSIG];
2976 sigset_t sigs;
2977 bool os::Aix::libjsig_is_loaded = false;
2978 typedef struct sigaction *(*get_signal_t)(int);
2979 get_signal_t os::Aix::get_signal_action = NULL;
2980
2981 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
2982 struct sigaction *actp = NULL;
2983
2984 if (libjsig_is_loaded) {
2985 // Retrieve the old signal handler from libjsig
2986 actp = (*get_signal_action)(sig);
2987 }
2988 if (actp == NULL) {
2989 // Retrieve the preinstalled signal handler from jvm
2990 actp = get_preinstalled_handler(sig);
2991 }
2992
2993 return actp;
2994 }
2995
2996 static bool call_chained_handler(struct sigaction *actp, int sig,
2997 siginfo_t *siginfo, void *context) {
2998 // Call the old signal handler
2999 if (actp->sa_handler == SIG_DFL) {
3000 // It's more reasonable to let jvm treat it as an unexpected exception
3001 // instead of taking the default action.
3002 return false;
3003 } else if (actp->sa_handler != SIG_IGN) {
3004 if ((actp->sa_flags & SA_NODEFER) == 0) {
3005 // automaticlly block the signal
3006 sigaddset(&(actp->sa_mask), sig);
3007 }
3008
3009 sa_handler_t hand = NULL;
3010 sa_sigaction_t sa = NULL;
3011 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3012 // retrieve the chained handler
3013 if (siginfo_flag_set) {
3014 sa = actp->sa_sigaction;
3015 } else {
3016 hand = actp->sa_handler;
3017 }
3018
3019 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3020 actp->sa_handler = SIG_DFL;
3021 }
3022
3023 // try to honor the signal mask
3024 sigset_t oset;
3025 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3026
3027 // call into the chained handler
3028 if (siginfo_flag_set) {
3029 (*sa)(sig, siginfo, context);
3030 } else {
3031 (*hand)(sig);
3032 }
3033
3034 // restore the signal mask
3035 pthread_sigmask(SIG_SETMASK, &oset, 0);
3036 }
3037 // Tell jvm's signal handler the signal is taken care of.
3038 return true;
3039 }
3040
3041 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3042 bool chained = false;
3043 // signal-chaining
3044 if (UseSignalChaining) {
3045 struct sigaction *actp = get_chained_signal_action(sig);
3046 if (actp != NULL) {
3047 chained = call_chained_handler(actp, sig, siginfo, context);
3048 }
3049 }
3050 return chained;
3051 }
3052
3053 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3054 if (sigismember(&sigs, sig)) {
3055 return &sigact[sig];
3056 }
3057 return NULL;
3058 }
3059
3060 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3061 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3062 sigact[sig] = oldAct;
3063 sigaddset(&sigs, sig);
3064 }
3065
3066 // for diagnostic
3067 int sigflags[NSIG];
3068
3069 int os::Aix::get_our_sigflags(int sig) {
3070 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3071 return sigflags[sig];
3072 }
3073
3074 void os::Aix::set_our_sigflags(int sig, int flags) {
3075 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3076 if (sig > 0 && sig < NSIG) {
3077 sigflags[sig] = flags;
3078 }
3079 }
3080
3081 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3082 // Check for overwrite.
3083 struct sigaction oldAct;
3084 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3085
3086 void* oldhand = oldAct.sa_sigaction
3087 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3088 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3089 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3090 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3091 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3092 if (AllowUserSignalHandlers || !set_installed) {
3093 // Do not overwrite; user takes responsibility to forward to us.
3094 return;
3095 } else if (UseSignalChaining) {
3096 // save the old handler in jvm
3097 save_preinstalled_handler(sig, oldAct);
3098 // libjsig also interposes the sigaction() call below and saves the
3099 // old sigaction on it own.
3100 } else {
3101 fatal("Encountered unexpected pre-existing sigaction handler "
3102 "%#lx for signal %d.", (long)oldhand, sig);
3103 }
3104 }
3105
3106 struct sigaction sigAct;
3107 sigfillset(&(sigAct.sa_mask));
3108 if (!set_installed) {
3109 sigAct.sa_handler = SIG_DFL;
3110 sigAct.sa_flags = SA_RESTART;
3111 } else {
3112 sigAct.sa_sigaction = javaSignalHandler;
3113 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3114 }
3115 // Save flags, which are set by ours
3116 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3117 sigflags[sig] = sigAct.sa_flags;
3118
3119 int ret = sigaction(sig, &sigAct, &oldAct);
3120 assert(ret == 0, "check");
3121
3122 void* oldhand2 = oldAct.sa_sigaction
3123 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3124 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3125 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3126 }
3127
3128 // install signal handlers for signals that HotSpot needs to
3129 // handle in order to support Java-level exception handling.
3130 void os::Aix::install_signal_handlers() {
3131 if (!signal_handlers_are_installed) {
3132 signal_handlers_are_installed = true;
3133
3134 // signal-chaining
3135 typedef void (*signal_setting_t)();
3136 signal_setting_t begin_signal_setting = NULL;
3137 signal_setting_t end_signal_setting = NULL;
3138 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3139 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3140 if (begin_signal_setting != NULL) {
3141 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3142 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3143 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3144 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3145 libjsig_is_loaded = true;
3146 assert(UseSignalChaining, "should enable signal-chaining");
3147 }
3148 if (libjsig_is_loaded) {
3149 // Tell libjsig jvm is setting signal handlers.
3150 (*begin_signal_setting)();
3151 }
3152
3153 ::sigemptyset(&sigs);
3154 set_signal_handler(SIGSEGV, true);
3155 set_signal_handler(SIGPIPE, true);
3156 set_signal_handler(SIGBUS, true);
3157 set_signal_handler(SIGILL, true);
3158 set_signal_handler(SIGFPE, true);
3159 set_signal_handler(SIGTRAP, true);
3160 set_signal_handler(SIGXFSZ, true);
3161 set_signal_handler(SIGDANGER, true);
3162
3163 if (libjsig_is_loaded) {
3164 // Tell libjsig jvm finishes setting signal handlers.
3165 (*end_signal_setting)();
3166 }
3167
3168 // We don't activate signal checker if libjsig is in place, we trust ourselves
3169 // and if UserSignalHandler is installed all bets are off.
3170 // Log that signal checking is off only if -verbose:jni is specified.
3171 if (CheckJNICalls) {
3172 if (libjsig_is_loaded) {
3173 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3174 check_signals = false;
3175 }
3176 if (AllowUserSignalHandlers) {
3177 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3178 check_signals = false;
3179 }
3180 // Need to initialize check_signal_done.
3181 ::sigemptyset(&check_signal_done);
3182 }
3183 }
3184 }
3185
3186 static const char* get_signal_handler_name(address handler,
3187 char* buf, int buflen) {
3188 int offset;
3189 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3190 if (found) {
3191 // skip directory names
3192 const char *p1, *p2;
3193 p1 = buf;
3194 size_t len = strlen(os::file_separator());
3195 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3196 // The way os::dll_address_to_library_name is implemented on Aix
3197 // right now, it always returns -1 for the offset which is not
3198 // terribly informative.
3199 // Will fix that. For now, omit the offset.
3200 jio_snprintf(buf, buflen, "%s", p1);
3201 } else {
3202 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3203 }
3204 return buf;
3205 }
3206
3207 static void print_signal_handler(outputStream* st, int sig,
3208 char* buf, size_t buflen) {
3209 struct sigaction sa;
3210 sigaction(sig, NULL, &sa);
3211
3212 st->print("%s: ", os::exception_name(sig, buf, buflen));
3213
3214 address handler = (sa.sa_flags & SA_SIGINFO)
3215 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3216 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3217
3218 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3219 st->print("SIG_DFL");
3220 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3221 st->print("SIG_IGN");
3222 } else {
3223 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3224 }
3225
3226 // Print readable mask.
3227 st->print(", sa_mask[0]=");
3228 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3229
3230 address rh = VMError::get_resetted_sighandler(sig);
3231 // May be, handler was resetted by VMError?
3232 if (rh != NULL) {
3233 handler = rh;
3234 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3235 }
3236
3237 // Print textual representation of sa_flags.
3238 st->print(", sa_flags=");
3239 os::Posix::print_sa_flags(st, sa.sa_flags);
3240
3241 // Check: is it our handler?
3242 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3243 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3244 // It is our signal handler.
3245 // Check for flags, reset system-used one!
3246 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3247 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3248 os::Aix::get_our_sigflags(sig));
3249 }
3250 }
3251 st->cr();
3252 }
3253
3254 #define DO_SIGNAL_CHECK(sig) \
3255 if (!sigismember(&check_signal_done, sig)) \
3256 os::Aix::check_signal_handler(sig)
3257
3258 // This method is a periodic task to check for misbehaving JNI applications
3259 // under CheckJNI, we can add any periodic checks here
3260
3261 void os::run_periodic_checks() {
3262
3263 if (check_signals == false) return;
3264
3265 // SEGV and BUS if overridden could potentially prevent
3266 // generation of hs*.log in the event of a crash, debugging
3267 // such a case can be very challenging, so we absolutely
3268 // check the following for a good measure:
3269 DO_SIGNAL_CHECK(SIGSEGV);
3270 DO_SIGNAL_CHECK(SIGILL);
3271 DO_SIGNAL_CHECK(SIGFPE);
3272 DO_SIGNAL_CHECK(SIGBUS);
3273 DO_SIGNAL_CHECK(SIGPIPE);
3274 DO_SIGNAL_CHECK(SIGXFSZ);
3275 if (UseSIGTRAP) {
3276 DO_SIGNAL_CHECK(SIGTRAP);
3277 }
3278 DO_SIGNAL_CHECK(SIGDANGER);
3279
3280 // ReduceSignalUsage allows the user to override these handlers
3281 // see comments at the very top and jvm_solaris.h
3282 if (!ReduceSignalUsage) {
3283 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3284 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3285 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3286 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3287 }
3288
3289 DO_SIGNAL_CHECK(SR_signum);
3290 }
3291
3292 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3293
3294 static os_sigaction_t os_sigaction = NULL;
3295
3296 void os::Aix::check_signal_handler(int sig) {
3297 char buf[O_BUFLEN];
3298 address jvmHandler = NULL;
3299
3300 struct sigaction act;
3301 if (os_sigaction == NULL) {
3302 // only trust the default sigaction, in case it has been interposed
3303 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3304 if (os_sigaction == NULL) return;
3305 }
3306
3307 os_sigaction(sig, (struct sigaction*)NULL, &act);
3308
3309 address thisHandler = (act.sa_flags & SA_SIGINFO)
3310 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3311 : CAST_FROM_FN_PTR(address, act.sa_handler);
3312
3313 switch(sig) {
3314 case SIGSEGV:
3315 case SIGBUS:
3316 case SIGFPE:
3317 case SIGPIPE:
3318 case SIGILL:
3319 case SIGXFSZ:
3320 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3321 break;
3322
3323 case SHUTDOWN1_SIGNAL:
3324 case SHUTDOWN2_SIGNAL:
3325 case SHUTDOWN3_SIGNAL:
3326 case BREAK_SIGNAL:
3327 jvmHandler = (address)user_handler();
3328 break;
3329
3330 default:
3331 if (sig == SR_signum) {
3332 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3333 } else {
3334 return;
3335 }
3336 break;
3337 }
3338
3339 if (thisHandler != jvmHandler) {
3340 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3341 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3342 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3343 // No need to check this sig any longer
3344 sigaddset(&check_signal_done, sig);
3345 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3346 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3347 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3348 exception_name(sig, buf, O_BUFLEN));
3349 }
3350 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3351 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3352 tty->print("expected:");
3353 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3354 tty->cr();
3355 tty->print(" found:");
3356 os::Posix::print_sa_flags(tty, act.sa_flags);
3357 tty->cr();
3358 // No need to check this sig any longer
3359 sigaddset(&check_signal_done, sig);
3360 }
3361
3362 // Dump all the signal
3363 if (sigismember(&check_signal_done, sig)) {
3364 print_signal_handlers(tty, buf, O_BUFLEN);
3365 }
3366 }
3367
3368 // To install functions for atexit system call
3369 extern "C" {
3370 static void perfMemory_exit_helper() {
3371 perfMemory_exit();
3372 }
3373 }
3374
3375 // This is called _before_ the most of global arguments have been parsed.
3376 void os::init(void) {
3377 // This is basic, we want to know if that ever changes.
3378 // (Shared memory boundary is supposed to be a 256M aligned.)
3379 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3380
3381 // Record process break at startup.
3382 g_brk_at_startup = (address) ::sbrk(0);
3383 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3384
3385 // First off, we need to know whether we run on AIX or PASE, and
3386 // the OS level we run on.
3387 os::Aix::initialize_os_info();
3388
3389 // Scan environment (SPEC1170 behaviour, etc).
3390 os::Aix::scan_environment();
3391
3392 // Probe multipage support.
3393 query_multipage_support();
3394
3395 // Act like we only have one page size by eliminating corner cases which
3396 // we did not support very well anyway.
3397 // We have two input conditions:
3398 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3399 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3400 // setting.
3401 // Data segment page size is important for us because it defines the thread stack page
3402 // size, which is needed for guard page handling, stack banging etc.
3403 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3404 // and should be allocated with 64k pages.
3405 //
3406 // So, we do the following:
3407 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3408 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3409 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3410 // 64k no --- AIX 5.2 ? ---
3411 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3412
3413 // We explicitly leave no option to change page size, because only upgrading would work,
3414 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3415
3416 if (g_multipage_support.datapsize == SIZE_4K) {
3417 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3418 if (g_multipage_support.can_use_64K_pages) {
3419 // .. but we are able to use 64K pages dynamically.
3420 // This would be typical for java launchers which are not linked
3421 // with datapsize=64K (like, any other launcher but our own).
3422 //
3423 // In this case it would be smart to allocate the java heap with 64K
3424 // to get the performance benefit, and to fake 64k pages for the
3425 // data segment (when dealing with thread stacks).
3426 //
3427 // However, leave a possibility to downgrade to 4K, using
3428 // -XX:-Use64KPages.
3429 if (Use64KPages) {
3430 trcVerbose("64K page mode (faked for data segment)");
3431 Aix::_page_size = SIZE_64K;
3432 } else {
3433 trcVerbose("4K page mode (Use64KPages=off)");
3434 Aix::_page_size = SIZE_4K;
3435 }
3436 } else {
3437 // .. and not able to allocate 64k pages dynamically. Here, just
3438 // fall back to 4K paged mode and use mmap for everything.
3439 trcVerbose("4K page mode");
3440 Aix::_page_size = SIZE_4K;
3441 FLAG_SET_ERGO(bool, Use64KPages, false);
3442 }
3443 } else {
3444 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3445 // This normally means that we can allocate 64k pages dynamically.
3446 // (There is one special case where this may be false: EXTSHM=on.
3447 // but we decided to not support that mode).
3448 assert0(g_multipage_support.can_use_64K_pages);
3449 Aix::_page_size = SIZE_64K;
3450 trcVerbose("64K page mode");
3451 FLAG_SET_ERGO(bool, Use64KPages, true);
3452 }
3453
3454 // Short-wire stack page size to base page size; if that works, we just remove
3455 // that stack page size altogether.
3456 Aix::_stack_page_size = Aix::_page_size;
3457
3458 // For now UseLargePages is just ignored.
3459 FLAG_SET_ERGO(bool, UseLargePages, false);
3460 _page_sizes[0] = 0;
3461
3462 // debug trace
3463 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3464
3465 // Next, we need to initialize libo4 and libperfstat libraries.
3466 if (os::Aix::on_pase()) {
3467 os::Aix::initialize_libo4();
3468 } else {
3469 os::Aix::initialize_libperfstat();
3470 }
3471
3472 // Reset the perfstat information provided by ODM.
3473 if (os::Aix::on_aix()) {
3474 libperfstat::perfstat_reset();
3475 }
3476
3477 // Now initialze basic system properties. Note that for some of the values we
3478 // need libperfstat etc.
3479 os::Aix::initialize_system_info();
3480
3481 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3482
3483 init_random(1234567);
3484
3485 ThreadCritical::initialize();
3486
3487 // Main_thread points to the aboriginal thread.
3488 Aix::_main_thread = pthread_self();
3489
3490 initial_time_count = os::elapsed_counter();
3491 }
3492
3493 // This is called _after_ the global arguments have been parsed.
3494 jint os::init_2(void) {
3495
3496 if (os::Aix::on_pase()) {
3497 trcVerbose("Running on PASE.");
3498 } else {
3499 trcVerbose("Running on AIX (not PASE).");
3500 }
3501
3502 trcVerbose("processor count: %d", os::_processor_count);
3503 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3504
3505 // Initially build up the loaded dll map.
3506 LoadedLibraries::reload();
3507 if (Verbose) {
3508 trcVerbose("Loaded Libraries: ");
3509 LoadedLibraries::print(tty);
3510 }
3511
3512 const int page_size = Aix::page_size();
3513 const int map_size = page_size;
3514
3515 address map_address = (address) MAP_FAILED;
3516 const int prot = PROT_READ;
3517 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3518
3519 // Use optimized addresses for the polling page,
3520 // e.g. map it to a special 32-bit address.
3521 if (OptimizePollingPageLocation) {
3522 // architecture-specific list of address wishes:
3523 address address_wishes[] = {
3524 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3525 // PPC64: all address wishes are non-negative 32 bit values where
3526 // the lower 16 bits are all zero. we can load these addresses
3527 // with a single ppc_lis instruction.
3528 (address) 0x30000000, (address) 0x31000000,
3529 (address) 0x32000000, (address) 0x33000000,
3530 (address) 0x40000000, (address) 0x41000000,
3531 (address) 0x42000000, (address) 0x43000000,
3532 (address) 0x50000000, (address) 0x51000000,
3533 (address) 0x52000000, (address) 0x53000000,
3534 (address) 0x60000000, (address) 0x61000000,
3535 (address) 0x62000000, (address) 0x63000000
3536 };
3537 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3538
3539 // iterate over the list of address wishes:
3540 for (int i=0; i<address_wishes_length; i++) {
3541 // Try to map with current address wish.
3542 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3543 // fail if the address is already mapped.
3544 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3545 map_size, prot,
3546 flags | MAP_FIXED,
3547 -1, 0);
3548 trcVerbose("SafePoint Polling Page address: %p (wish) => %p",
3549 address_wishes[i], map_address + (ssize_t)page_size);
3550
3551 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3552 // Map succeeded and map_address is at wished address, exit loop.
3553 break;
3554 }
3555
3556 if (map_address != (address) MAP_FAILED) {
3557 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3558 ::munmap(map_address, map_size);
3559 map_address = (address) MAP_FAILED;
3560 }
3561 // Map failed, continue loop.
3562 }
3563 } // end OptimizePollingPageLocation
3564
3565 if (map_address == (address) MAP_FAILED) {
3566 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3567 }
3568 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3569 os::set_polling_page(map_address);
3570
3571 if (!UseMembar) {
3572 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3573 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3574 os::set_memory_serialize_page(mem_serialize_page);
3575
3576 trcVerbose("Memory Serialize Page address: %p - %p, size %IX (%IB)",
3577 mem_serialize_page, mem_serialize_page + Aix::page_size(),
3578 Aix::page_size(), Aix::page_size());
3579 }
3580
3581 // initialize suspend/resume support - must do this before signal_sets_init()
3582 if (SR_initialize() != 0) {
3583 perror("SR_initialize failed");
3584 return JNI_ERR;
3585 }
3586
3587 Aix::signal_sets_init();
3588 Aix::install_signal_handlers();
3589
3590 // Check minimum allowable stack size for thread creation and to initialize
3591 // the java system classes, including StackOverflowError - depends on page
3592 // size. Add a page for compiler2 recursion in main thread.
3593 // Add in 2*BytesPerWord times page size to account for VM stack during
3594 // class initialization depending on 32 or 64 bit VM.
3595 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3596 JavaThread::stack_guard_zone_size() +
3597 JavaThread::stack_shadow_zone_size() +
3598 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::vm_default_page_size());
3599
3600 os::Aix::min_stack_allowed = align_size_up(os::Aix::min_stack_allowed, os::Aix::page_size());
3601
3602 size_t threadStackSizeInBytes = ThreadStackSize * K;
3603 if (threadStackSizeInBytes != 0 &&
3604 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3605 tty->print_cr("\nThe stack size specified is too small, "
3606 "Specify at least %dk",
3607 os::Aix::min_stack_allowed / K);
3608 return JNI_ERR;
3609 }
3610
3611 // Make the stack size a multiple of the page size so that
3612 // the yellow/red zones can be guarded.
3613 // Note that this can be 0, if no default stacksize was set.
3614 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3615
3616 if (UseNUMA) {
3617 UseNUMA = false;
3618 warning("NUMA optimizations are not available on this OS.");
3619 }
3620
3621 if (MaxFDLimit) {
3622 // Set the number of file descriptors to max. print out error
3623 // if getrlimit/setrlimit fails but continue regardless.
3624 struct rlimit nbr_files;
3625 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3626 if (status != 0) {
3627 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3628 } else {
3629 nbr_files.rlim_cur = nbr_files.rlim_max;
3630 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3631 if (status != 0) {
3632 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3633 }
3634 }
3635 }
3636
3637 if (PerfAllowAtExitRegistration) {
3638 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3639 // At exit functions can be delayed until process exit time, which
3640 // can be problematic for embedded VM situations. Embedded VMs should
3641 // call DestroyJavaVM() to assure that VM resources are released.
3642
3643 // Note: perfMemory_exit_helper atexit function may be removed in
3644 // the future if the appropriate cleanup code can be added to the
3645 // VM_Exit VMOperation's doit method.
3646 if (atexit(perfMemory_exit_helper) != 0) {
3647 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3648 }
3649 }
3650
3651 return JNI_OK;
3652 }
3653
3654 // Mark the polling page as unreadable
3655 void os::make_polling_page_unreadable(void) {
3656 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3657 fatal("Could not disable polling page");
3658 }
3659 };
3660
3661 // Mark the polling page as readable
3662 void os::make_polling_page_readable(void) {
3663 // Changed according to os_linux.cpp.
3664 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3665 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3666 }
3667 };
3668
3669 int os::active_processor_count() {
3670 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3671 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3672 return online_cpus;
3673 }
3674
3675 void os::set_native_thread_name(const char *name) {
3676 // Not yet implemented.
3677 return;
3678 }
3679
3680 bool os::distribute_processes(uint length, uint* distribution) {
3681 // Not yet implemented.
3682 return false;
3683 }
3684
3685 bool os::bind_to_processor(uint processor_id) {
3686 // Not yet implemented.
3687 return false;
3688 }
3689
3690 void os::SuspendedThreadTask::internal_do_task() {
3691 if (do_suspend(_thread->osthread())) {
3692 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3693 do_task(context);
3694 do_resume(_thread->osthread());
3695 }
3696 }
3697
3698 class PcFetcher : public os::SuspendedThreadTask {
3699 public:
3700 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3701 ExtendedPC result();
3702 protected:
3703 void do_task(const os::SuspendedThreadTaskContext& context);
3704 private:
3705 ExtendedPC _epc;
3706 };
3707
3708 ExtendedPC PcFetcher::result() {
3709 guarantee(is_done(), "task is not done yet.");
3710 return _epc;
3711 }
3712
3713 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3714 Thread* thread = context.thread();
3715 OSThread* osthread = thread->osthread();
3716 if (osthread->ucontext() != NULL) {
3717 _epc = os::Aix::ucontext_get_pc((const ucontext_t *) context.ucontext());
3718 } else {
3719 // NULL context is unexpected, double-check this is the VMThread.
3720 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3721 }
3722 }
3723
3724 // Suspends the target using the signal mechanism and then grabs the PC before
3725 // resuming the target. Used by the flat-profiler only
3726 ExtendedPC os::get_thread_pc(Thread* thread) {
3727 // Make sure that it is called by the watcher for the VMThread.
3728 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3729 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3730
3731 PcFetcher fetcher(thread);
3732 fetcher.run();
3733 return fetcher.result();
3734 }
3735
3736 ////////////////////////////////////////////////////////////////////////////////
3737 // debug support
3738
3739 bool os::find(address addr, outputStream* st) {
3740
3741 st->print(PTR_FORMAT ": ", addr);
3742
3743 loaded_module_t lm;
3744 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3745 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3746 st->print_cr("%s", lm.path);
3747 return true;
3748 }
3749
3750 return false;
3751 }
3752
3753 ////////////////////////////////////////////////////////////////////////////////
3754 // misc
3755
3756 // This does not do anything on Aix. This is basically a hook for being
3757 // able to use structured exception handling (thread-local exception filters)
3758 // on, e.g., Win32.
3759 void
3760 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3761 JavaCallArguments* args, Thread* thread) {
3762 f(value, method, args, thread);
3763 }
3764
3765 void os::print_statistics() {
3766 }
3767
3768 bool os::message_box(const char* title, const char* message) {
3769 int i;
3770 fdStream err(defaultStream::error_fd());
3771 for (i = 0; i < 78; i++) err.print_raw("=");
3772 err.cr();
3773 err.print_raw_cr(title);
3774 for (i = 0; i < 78; i++) err.print_raw("-");
3775 err.cr();
3776 err.print_raw_cr(message);
3777 for (i = 0; i < 78; i++) err.print_raw("=");
3778 err.cr();
3779
3780 char buf[16];
3781 // Prevent process from exiting upon "read error" without consuming all CPU
3782 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3783
3784 return buf[0] == 'y' || buf[0] == 'Y';
3785 }
3786
3787 int os::stat(const char *path, struct stat *sbuf) {
3788 char pathbuf[MAX_PATH];
3789 if (strlen(path) > MAX_PATH - 1) {
3790 errno = ENAMETOOLONG;
3791 return -1;
3792 }
3793 os::native_path(strcpy(pathbuf, path));
3794 return ::stat(pathbuf, sbuf);
3795 }
3796
3797 bool os::check_heap(bool force) {
3798 return true;
3799 }
3800
3801 // Is a (classpath) directory empty?
3802 bool os::dir_is_empty(const char* path) {
3803 DIR *dir = NULL;
3804 struct dirent *ptr;
3805
3806 dir = opendir(path);
3807 if (dir == NULL) return true;
3808
3809 /* Scan the directory */
3810 bool result = true;
3811 char buf[sizeof(struct dirent) + MAX_PATH];
3812 while (result && (ptr = ::readdir(dir)) != NULL) {
3813 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3814 result = false;
3815 }
3816 }
3817 closedir(dir);
3818 return result;
3819 }
3820
3821 // This code originates from JDK's sysOpen and open64_w
3822 // from src/solaris/hpi/src/system_md.c
3823
3824 int os::open(const char *path, int oflag, int mode) {
3825
3826 if (strlen(path) > MAX_PATH - 1) {
3827 errno = ENAMETOOLONG;
3828 return -1;
3829 }
3830 int fd;
3831
3832 fd = ::open64(path, oflag, mode);
3833 if (fd == -1) return -1;
3834
3835 // If the open succeeded, the file might still be a directory.
3836 {
3837 struct stat64 buf64;
3838 int ret = ::fstat64(fd, &buf64);
3839 int st_mode = buf64.st_mode;
3840
3841 if (ret != -1) {
3842 if ((st_mode & S_IFMT) == S_IFDIR) {
3843 errno = EISDIR;
3844 ::close(fd);
3845 return -1;
3846 }
3847 } else {
3848 ::close(fd);
3849 return -1;
3850 }
3851 }
3852
3853 // All file descriptors that are opened in the JVM and not
3854 // specifically destined for a subprocess should have the
3855 // close-on-exec flag set. If we don't set it, then careless 3rd
3856 // party native code might fork and exec without closing all
3857 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3858 // UNIXProcess.c), and this in turn might:
3859 //
3860 // - cause end-of-file to fail to be detected on some file
3861 // descriptors, resulting in mysterious hangs, or
3862 //
3863 // - might cause an fopen in the subprocess to fail on a system
3864 // suffering from bug 1085341.
3865 //
3866 // (Yes, the default setting of the close-on-exec flag is a Unix
3867 // design flaw.)
3868 //
3869 // See:
3870 // 1085341: 32-bit stdio routines should support file descriptors >255
3871 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3872 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3873 #ifdef FD_CLOEXEC
3874 {
3875 int flags = ::fcntl(fd, F_GETFD);
3876 if (flags != -1)
3877 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3878 }
3879 #endif
3880
3881 return fd;
3882 }
3883
3884 // create binary file, rewriting existing file if required
3885 int os::create_binary_file(const char* path, bool rewrite_existing) {
3886 int oflags = O_WRONLY | O_CREAT;
3887 if (!rewrite_existing) {
3888 oflags |= O_EXCL;
3889 }
3890 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3891 }
3892
3893 // return current position of file pointer
3894 jlong os::current_file_offset(int fd) {
3895 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3896 }
3897
3898 // move file pointer to the specified offset
3899 jlong os::seek_to_file_offset(int fd, jlong offset) {
3900 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3901 }
3902
3903 // This code originates from JDK's sysAvailable
3904 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3905
3906 int os::available(int fd, jlong *bytes) {
3907 jlong cur, end;
3908 int mode;
3909 struct stat64 buf64;
3910
3911 if (::fstat64(fd, &buf64) >= 0) {
3912 mode = buf64.st_mode;
3913 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3914 int n;
3915 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3916 *bytes = n;
3917 return 1;
3918 }
3919 }
3920 }
3921 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3922 return 0;
3923 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3924 return 0;
3925 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3926 return 0;
3927 }
3928 *bytes = end - cur;
3929 return 1;
3930 }
3931
3932 // Map a block of memory.
3933 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3934 char *addr, size_t bytes, bool read_only,
3935 bool allow_exec) {
3936 int prot;
3937 int flags = MAP_PRIVATE;
3938
3939 if (read_only) {
3940 prot = PROT_READ;
3941 flags = MAP_SHARED;
3942 } else {
3943 prot = PROT_READ | PROT_WRITE;
3944 flags = MAP_PRIVATE;
3945 }
3946
3947 if (allow_exec) {
3948 prot |= PROT_EXEC;
3949 }
3950
3951 if (addr != NULL) {
3952 flags |= MAP_FIXED;
3953 }
3954
3955 // Allow anonymous mappings if 'fd' is -1.
3956 if (fd == -1) {
3957 flags |= MAP_ANONYMOUS;
3958 }
3959
3960 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3961 fd, file_offset);
3962 if (mapped_address == MAP_FAILED) {
3963 return NULL;
3964 }
3965 return mapped_address;
3966 }
3967
3968 // Remap a block of memory.
3969 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3970 char *addr, size_t bytes, bool read_only,
3971 bool allow_exec) {
3972 // same as map_memory() on this OS
3973 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3974 allow_exec);
3975 }
3976
3977 // Unmap a block of memory.
3978 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3979 return munmap(addr, bytes) == 0;
3980 }
3981
3982 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3983 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3984 // of a thread.
3985 //
3986 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3987 // the fast estimate available on the platform.
3988
3989 jlong os::current_thread_cpu_time() {
3990 // return user + sys since the cost is the same
3991 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3992 assert(n >= 0, "negative CPU time");
3993 return n;
3994 }
3995
3996 jlong os::thread_cpu_time(Thread* thread) {
3997 // consistent with what current_thread_cpu_time() returns
3998 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3999 assert(n >= 0, "negative CPU time");
4000 return n;
4001 }
4002
4003 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4004 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4005 assert(n >= 0, "negative CPU time");
4006 return n;
4007 }
4008
4009 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4010 bool error = false;
4011
4012 jlong sys_time = 0;
4013 jlong user_time = 0;
4014
4015 // Reimplemented using getthrds64().
4016 //
4017 // Works like this:
4018 // For the thread in question, get the kernel thread id. Then get the
4019 // kernel thread statistics using that id.
4020 //
4021 // This only works of course when no pthread scheduling is used,
4022 // i.e. there is a 1:1 relationship to kernel threads.
4023 // On AIX, see AIXTHREAD_SCOPE variable.
4024
4025 pthread_t pthtid = thread->osthread()->pthread_id();
4026
4027 // retrieve kernel thread id for the pthread:
4028 tid64_t tid = 0;
4029 struct __pthrdsinfo pinfo;
4030 // I just love those otherworldly IBM APIs which force me to hand down
4031 // dummy buffers for stuff I dont care for...
4032 char dummy[1];
4033 int dummy_size = sizeof(dummy);
4034 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4035 dummy, &dummy_size) == 0) {
4036 tid = pinfo.__pi_tid;
4037 } else {
4038 tty->print_cr("pthread_getthrds_np failed.");
4039 error = true;
4040 }
4041
4042 // retrieve kernel timing info for that kernel thread
4043 if (!error) {
4044 struct thrdentry64 thrdentry;
4045 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4046 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4047 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4048 } else {
4049 tty->print_cr("pthread_getthrds_np failed.");
4050 error = true;
4051 }
4052 }
4053
4054 if (p_sys_time) {
4055 *p_sys_time = sys_time;
4056 }
4057
4058 if (p_user_time) {
4059 *p_user_time = user_time;
4060 }
4061
4062 if (error) {
4063 return false;
4064 }
4065
4066 return true;
4067 }
4068
4069 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4070 jlong sys_time;
4071 jlong user_time;
4072
4073 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4074 return -1;
4075 }
4076
4077 return user_sys_cpu_time ? sys_time + user_time : user_time;
4078 }
4079
4080 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4081 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4082 info_ptr->may_skip_backward = false; // elapsed time not wall time
4083 info_ptr->may_skip_forward = false; // elapsed time not wall time
4084 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4085 }
4086
4087 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4088 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4089 info_ptr->may_skip_backward = false; // elapsed time not wall time
4090 info_ptr->may_skip_forward = false; // elapsed time not wall time
4091 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4092 }
4093
4094 bool os::is_thread_cpu_time_supported() {
4095 return true;
4096 }
4097
4098 // System loadavg support. Returns -1 if load average cannot be obtained.
4099 // For now just return the system wide load average (no processor sets).
4100 int os::loadavg(double values[], int nelem) {
4101
4102 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4103 guarantee(values, "argument error");
4104
4105 if (os::Aix::on_pase()) {
4106
4107 // AS/400 PASE: use libo4 porting library
4108 double v[3] = { 0.0, 0.0, 0.0 };
4109
4110 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4111 for (int i = 0; i < nelem; i ++) {
4112 values[i] = v[i];
4113 }
4114 return nelem;
4115 } else {
4116 return -1;
4117 }
4118
4119 } else {
4120
4121 // AIX: use libperfstat
4122 libperfstat::cpuinfo_t ci;
4123 if (libperfstat::get_cpuinfo(&ci)) {
4124 for (int i = 0; i < nelem; i++) {
4125 values[i] = ci.loadavg[i];
4126 }
4127 } else {
4128 return -1;
4129 }
4130 return nelem;
4131 }
4132 }
4133
4134 void os::pause() {
4135 char filename[MAX_PATH];
4136 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4137 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4138 } else {
4139 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4140 }
4141
4142 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4143 if (fd != -1) {
4144 struct stat buf;
4145 ::close(fd);
4146 while (::stat(filename, &buf) == 0) {
4147 (void)::poll(NULL, 0, 100);
4148 }
4149 } else {
4150 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4151 }
4152 }
4153
4154 bool os::Aix::is_primordial_thread() {
4155 if (pthread_self() == (pthread_t)1) {
4156 return true;
4157 } else {
4158 return false;
4159 }
4160 }
4161
4162 // OS recognitions (PASE/AIX, OS level) call this before calling any
4163 // one of Aix::on_pase(), Aix::os_version() static
4164 void os::Aix::initialize_os_info() {
4165
4166 assert(_on_pase == -1 && _os_version == 0, "already called.");
4167
4168 struct utsname uts;
4169 memset(&uts, 0, sizeof(uts));
4170 strcpy(uts.sysname, "?");
4171 if (::uname(&uts) == -1) {
4172 trcVerbose("uname failed (%d)", errno);
4173 guarantee(0, "Could not determine whether we run on AIX or PASE");
4174 } else {
4175 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4176 "node \"%s\" machine \"%s\"\n",
4177 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4178 const int major = atoi(uts.version);
4179 assert(major > 0, "invalid OS version");
4180 const int minor = atoi(uts.release);
4181 assert(minor > 0, "invalid OS release");
4182 _os_version = (major << 24) | (minor << 16);
4183 char ver_str[20] = {0};
4184 char *name_str = "unknown OS";
4185 if (strcmp(uts.sysname, "OS400") == 0) {
4186 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4187 _on_pase = 1;
4188 if (os_version_short() < 0x0504) {
4189 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4190 assert(false, "OS/400 release too old.");
4191 }
4192 name_str = "OS/400 (pase)";
4193 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4194 } else if (strcmp(uts.sysname, "AIX") == 0) {
4195 // We run on AIX. We do not support versions older than AIX 5.3.
4196 _on_pase = 0;
4197 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4198 odmWrapper::determine_os_kernel_version(&_os_version);
4199 if (os_version_short() < 0x0503) {
4200 trcVerbose("AIX release older than AIX 5.3 not supported.");
4201 assert(false, "AIX release too old.");
4202 }
4203 name_str = "AIX";
4204 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4205 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4206 } else {
4207 assert(false, name_str);
4208 }
4209 trcVerbose("We run on %s %s", name_str, ver_str);
4210 }
4211
4212 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4213 } // end: os::Aix::initialize_os_info()
4214
4215 // Scan environment for important settings which might effect the VM.
4216 // Trace out settings. Warn about invalid settings and/or correct them.
4217 //
4218 // Must run after os::Aix::initialue_os_info().
4219 void os::Aix::scan_environment() {
4220
4221 char* p;
4222 int rc;
4223
4224 // Warn explicity if EXTSHM=ON is used. That switch changes how
4225 // System V shared memory behaves. One effect is that page size of
4226 // shared memory cannot be change dynamically, effectivly preventing
4227 // large pages from working.
4228 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4229 // recommendation is (in OSS notes) to switch it off.
4230 p = ::getenv("EXTSHM");
4231 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4232 if (p && strcasecmp(p, "ON") == 0) {
4233 _extshm = 1;
4234 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4235 if (!AllowExtshm) {
4236 // We allow under certain conditions the user to continue. However, we want this
4237 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4238 // that the VM is not able to allocate 64k pages for the heap.
4239 // We do not want to run with reduced performance.
4240 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4241 }
4242 } else {
4243 _extshm = 0;
4244 }
4245
4246 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4247 // Not tested, not supported.
4248 //
4249 // Note that it might be worth the trouble to test and to require it, if only to
4250 // get useful return codes for mprotect.
4251 //
4252 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4253 // exec() ? before loading the libjvm ? ....)
4254 p = ::getenv("XPG_SUS_ENV");
4255 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4256 if (p && strcmp(p, "ON") == 0) {
4257 _xpg_sus_mode = 1;
4258 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4259 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4260 // clobber address ranges. If we ever want to support that, we have to do some
4261 // testing first.
4262 guarantee(false, "XPG_SUS_ENV=ON not supported");
4263 } else {
4264 _xpg_sus_mode = 0;
4265 }
4266
4267 if (os::Aix::on_pase()) {
4268 p = ::getenv("QIBM_MULTI_THREADED");
4269 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4270 }
4271
4272 p = ::getenv("LDR_CNTRL");
4273 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4274 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4275 if (p && ::strstr(p, "TEXTPSIZE")) {
4276 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4277 "you may experience hangs or crashes on OS/400 V7R1.");
4278 }
4279 }
4280
4281 p = ::getenv("AIXTHREAD_GUARDPAGES");
4282 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4283
4284 } // end: os::Aix::scan_environment()
4285
4286 // PASE: initialize the libo4 library (PASE porting library).
4287 void os::Aix::initialize_libo4() {
4288 guarantee(os::Aix::on_pase(), "OS/400 only.");
4289 if (!libo4::init()) {
4290 trcVerbose("libo4 initialization failed.");
4291 assert(false, "libo4 initialization failed");
4292 } else {
4293 trcVerbose("libo4 initialized.");
4294 }
4295 }
4296
4297 // AIX: initialize the libperfstat library.
4298 void os::Aix::initialize_libperfstat() {
4299 assert(os::Aix::on_aix(), "AIX only");
4300 if (!libperfstat::init()) {
4301 trcVerbose("libperfstat initialization failed.");
4302 assert(false, "libperfstat initialization failed");
4303 } else {
4304 trcVerbose("libperfstat initialized.");
4305 }
4306 }
4307
4308 /////////////////////////////////////////////////////////////////////////////
4309 // thread stack
4310
4311 // Function to query the current stack size using pthread_getthrds_np.
4312 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4313 // This only works when invoked on a pthread. As we agreed not to use
4314 // primordial threads anyway, I assert here.
4315 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4316
4317 // Information about this api can be found (a) in the pthread.h header and
4318 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4319 //
4320 // The use of this API to find out the current stack is kind of undefined.
4321 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4322 // enough for cases where I let the pthread library create its stacks. For cases
4323 // where I create an own stack and pass this to pthread_create, it seems not to
4324 // work (the returned stack size in that case is 0).
4325
4326 pthread_t tid = pthread_self();
4327 struct __pthrdsinfo pinfo;
4328 char dummy[1]; // Just needed to satisfy pthread_getthrds_np.
4329 int dummy_size = sizeof(dummy);
4330
4331 memset(&pinfo, 0, sizeof(pinfo));
4332
4333 const int rc = pthread_getthrds_np(&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4334 sizeof(pinfo), dummy, &dummy_size);
4335
4336 if (rc != 0) {
4337 assert0(false);
4338 trcVerbose("pthread_getthrds_np failed (%d)", rc);
4339 return false;
4340 }
4341 guarantee0(pinfo.__pi_stackend);
4342
4343 // The following may happen when invoking pthread_getthrds_np on a pthread
4344 // running on a user provided stack (when handing down a stack to pthread
4345 // create, see pthread_attr_setstackaddr).
4346 // Not sure what to do then.
4347
4348 guarantee0(pinfo.__pi_stacksize);
4349
4350 // Note: we get three values from pthread_getthrds_np:
4351 // __pi_stackaddr, __pi_stacksize, __pi_stackend
4352 //
4353 // high addr ---------------------
4354 //
4355 // | pthread internal data, like ~2K
4356 // |
4357 // | --------------------- __pi_stackend (usually not page aligned, (xxxxF890))
4358 // |
4359 // |
4360 // |
4361 // |
4362 // |
4363 // |
4364 // | --------------------- (__pi_stackend - __pi_stacksize)
4365 // |
4366 // | padding to align the following AIX guard pages, if enabled.
4367 // |
4368 // V --------------------- __pi_stackaddr
4369 //
4370 // low addr AIX guard pages, if enabled (AIXTHREAD_GUARDPAGES > 0)
4371 //
4372
4373 address stack_base = (address)(pinfo.__pi_stackend);
4374 address stack_low_addr = (address)align_ptr_up(pinfo.__pi_stackaddr,
4375 os::vm_page_size());
4376 size_t stack_size = stack_base - stack_low_addr;
4377
4378 if (p_stack_base) {
4379 *p_stack_base = stack_base;
4380 }
4381
4382 if (p_stack_size) {
4383 *p_stack_size = stack_size;
4384 }
4385
4386 return true;
4387 }
4388
4389 // Get the current stack base from the OS (actually, the pthread library).
4390 address os::current_stack_base() {
4391 address p;
4392 query_stack_dimensions(&p, 0);
4393 return p;
4394 }
4395
4396 // Get the current stack size from the OS (actually, the pthread library).
4397 size_t os::current_stack_size() {
4398 size_t s;
4399 query_stack_dimensions(0, &s);
4400 return s;
4401 }
4402
4403 // Refer to the comments in os_solaris.cpp park-unpark.
4404
4405 // utility to compute the abstime argument to timedwait:
4406 // millis is the relative timeout time
4407 // abstime will be the absolute timeout time
4408 // TODO: replace compute_abstime() with unpackTime()
4409
4410 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4411 if (millis < 0) millis = 0;
4412 struct timeval now;
4413 int status = gettimeofday(&now, NULL);
4414 assert(status == 0, "gettimeofday");
4415 jlong seconds = millis / 1000;
4416 millis %= 1000;
4417 if (seconds > 50000000) { // see man cond_timedwait(3T)
4418 seconds = 50000000;
4419 }
4420 abstime->tv_sec = now.tv_sec + seconds;
4421 long usec = now.tv_usec + millis * 1000;
4422 if (usec >= 1000000) {
4423 abstime->tv_sec += 1;
4424 usec -= 1000000;
4425 }
4426 abstime->tv_nsec = usec * 1000;
4427 return abstime;
4428 }
4429
4430 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4431 // Conceptually TryPark() should be equivalent to park(0).
4432
4433 int os::PlatformEvent::TryPark() {
4434 for (;;) {
4435 const int v = _Event;
4436 guarantee ((v == 0) || (v == 1), "invariant");
4437 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4438 }
4439 }
4440
4441 void os::PlatformEvent::park() { // AKA "down()"
4442 // Invariant: Only the thread associated with the Event/PlatformEvent
4443 // may call park().
4444 // TODO: assert that _Assoc != NULL or _Assoc == Self
4445 int v;
4446 for (;;) {
4447 v = _Event;
4448 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4449 }
4450 guarantee (v >= 0, "invariant");
4451 if (v == 0) {
4452 // Do this the hard way by blocking ...
4453 int status = pthread_mutex_lock(_mutex);
4454 assert_status(status == 0, status, "mutex_lock");
4455 guarantee (_nParked == 0, "invariant");
4456 ++ _nParked;
4457 while (_Event < 0) {
4458 status = pthread_cond_wait(_cond, _mutex);
4459 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4460 }
4461 -- _nParked;
4462
4463 // In theory we could move the ST of 0 into _Event past the unlock(),
4464 // but then we'd need a MEMBAR after the ST.
4465 _Event = 0;
4466 status = pthread_mutex_unlock(_mutex);
4467 assert_status(status == 0, status, "mutex_unlock");
4468 }
4469 guarantee (_Event >= 0, "invariant");
4470 }
4471
4472 int os::PlatformEvent::park(jlong millis) {
4473 guarantee (_nParked == 0, "invariant");
4474
4475 int v;
4476 for (;;) {
4477 v = _Event;
4478 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4479 }
4480 guarantee (v >= 0, "invariant");
4481 if (v != 0) return OS_OK;
4482
4483 // We do this the hard way, by blocking the thread.
4484 // Consider enforcing a minimum timeout value.
4485 struct timespec abst;
4486 compute_abstime(&abst, millis);
4487
4488 int ret = OS_TIMEOUT;
4489 int status = pthread_mutex_lock(_mutex);
4490 assert_status(status == 0, status, "mutex_lock");
4491 guarantee (_nParked == 0, "invariant");
4492 ++_nParked;
4493
4494 // Object.wait(timo) will return because of
4495 // (a) notification
4496 // (b) timeout
4497 // (c) thread.interrupt
4498 //
4499 // Thread.interrupt and object.notify{All} both call Event::set.
4500 // That is, we treat thread.interrupt as a special case of notification.
4501 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4502 // We assume all ETIME returns are valid.
4503 //
4504 // TODO: properly differentiate simultaneous notify+interrupt.
4505 // In that case, we should propagate the notify to another waiter.
4506
4507 while (_Event < 0) {
4508 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4509 assert_status(status == 0 || status == ETIMEDOUT,
4510 status, "cond_timedwait");
4511 if (!FilterSpuriousWakeups) break; // previous semantics
4512 if (status == ETIMEDOUT) break;
4513 // We consume and ignore EINTR and spurious wakeups.
4514 }
4515 --_nParked;
4516 if (_Event >= 0) {
4517 ret = OS_OK;
4518 }
4519 _Event = 0;
4520 status = pthread_mutex_unlock(_mutex);
4521 assert_status(status == 0, status, "mutex_unlock");
4522 assert (_nParked == 0, "invariant");
4523 return ret;
4524 }
4525
4526 void os::PlatformEvent::unpark() {
4527 int v, AnyWaiters;
4528 for (;;) {
4529 v = _Event;
4530 if (v > 0) {
4531 // The LD of _Event could have reordered or be satisfied
4532 // by a read-aside from this processor's write buffer.
4533 // To avoid problems execute a barrier and then
4534 // ratify the value.
4535 OrderAccess::fence();
4536 if (_Event == v) return;
4537 continue;
4538 }
4539 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4540 }
4541 if (v < 0) {
4542 // Wait for the thread associated with the event to vacate
4543 int status = pthread_mutex_lock(_mutex);
4544 assert_status(status == 0, status, "mutex_lock");
4545 AnyWaiters = _nParked;
4546
4547 if (AnyWaiters != 0) {
4548 // We intentional signal *after* dropping the lock
4549 // to avoid a common class of futile wakeups.
4550 status = pthread_cond_signal(_cond);
4551 assert_status(status == 0, status, "cond_signal");
4552 }
4553 // Mutex should be locked for pthread_cond_signal(_cond).
4554 status = pthread_mutex_unlock(_mutex);
4555 assert_status(status == 0, status, "mutex_unlock");
4556 }
4557
4558 // Note that we signal() _after dropping the lock for "immortal" Events.
4559 // This is safe and avoids a common class of futile wakeups. In rare
4560 // circumstances this can cause a thread to return prematurely from
4561 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4562 // simply re-test the condition and re-park itself.
4563 }
4564
4565
4566 // JSR166
4567 // -------------------------------------------------------
4568
4569 //
4570 // The solaris and linux implementations of park/unpark are fairly
4571 // conservative for now, but can be improved. They currently use a
4572 // mutex/condvar pair, plus a a count.
4573 // Park decrements count if > 0, else does a condvar wait. Unpark
4574 // sets count to 1 and signals condvar. Only one thread ever waits
4575 // on the condvar. Contention seen when trying to park implies that someone
4576 // is unparking you, so don't wait. And spurious returns are fine, so there
4577 // is no need to track notifications.
4578 //
4579
4580 #define MAX_SECS 100000000
4581 //
4582 // This code is common to linux and solaris and will be moved to a
4583 // common place in dolphin.
4584 //
4585 // The passed in time value is either a relative time in nanoseconds
4586 // or an absolute time in milliseconds. Either way it has to be unpacked
4587 // into suitable seconds and nanoseconds components and stored in the
4588 // given timespec structure.
4589 // Given time is a 64-bit value and the time_t used in the timespec is only
4590 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4591 // overflow if times way in the future are given. Further on Solaris versions
4592 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4593 // number of seconds, in abstime, is less than current_time + 100,000,000.
4594 // As it will be 28 years before "now + 100000000" will overflow we can
4595 // ignore overflow and just impose a hard-limit on seconds using the value
4596 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4597 // years from "now".
4598 //
4599
4600 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4601 assert (time > 0, "convertTime");
4602
4603 struct timeval now;
4604 int status = gettimeofday(&now, NULL);
4605 assert(status == 0, "gettimeofday");
4606
4607 time_t max_secs = now.tv_sec + MAX_SECS;
4608
4609 if (isAbsolute) {
4610 jlong secs = time / 1000;
4611 if (secs > max_secs) {
4612 absTime->tv_sec = max_secs;
4613 }
4614 else {
4615 absTime->tv_sec = secs;
4616 }
4617 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4618 }
4619 else {
4620 jlong secs = time / NANOSECS_PER_SEC;
4621 if (secs >= MAX_SECS) {
4622 absTime->tv_sec = max_secs;
4623 absTime->tv_nsec = 0;
4624 }
4625 else {
4626 absTime->tv_sec = now.tv_sec + secs;
4627 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4628 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4629 absTime->tv_nsec -= NANOSECS_PER_SEC;
4630 ++absTime->tv_sec; // note: this must be <= max_secs
4631 }
4632 }
4633 }
4634 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4635 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4636 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4637 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4638 }
4639
4640 void Parker::park(bool isAbsolute, jlong time) {
4641 // Optional fast-path check:
4642 // Return immediately if a permit is available.
4643 if (_counter > 0) {
4644 _counter = 0;
4645 OrderAccess::fence();
4646 return;
4647 }
4648
4649 Thread* thread = Thread::current();
4650 assert(thread->is_Java_thread(), "Must be JavaThread");
4651 JavaThread *jt = (JavaThread *)thread;
4652
4653 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4654 // Check interrupt before trying to wait
4655 if (Thread::is_interrupted(thread, false)) {
4656 return;
4657 }
4658
4659 // Next, demultiplex/decode time arguments
4660 timespec absTime;
4661 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4662 return;
4663 }
4664 if (time > 0) {
4665 unpackTime(&absTime, isAbsolute, time);
4666 }
4667
4668 // Enter safepoint region
4669 // Beware of deadlocks such as 6317397.
4670 // The per-thread Parker:: mutex is a classic leaf-lock.
4671 // In particular a thread must never block on the Threads_lock while
4672 // holding the Parker:: mutex. If safepoints are pending both the
4673 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4674 ThreadBlockInVM tbivm(jt);
4675
4676 // Don't wait if cannot get lock since interference arises from
4677 // unblocking. Also. check interrupt before trying wait
4678 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4679 return;
4680 }
4681
4682 int status;
4683 if (_counter > 0) { // no wait needed
4684 _counter = 0;
4685 status = pthread_mutex_unlock(_mutex);
4686 assert (status == 0, "invariant");
4687 OrderAccess::fence();
4688 return;
4689 }
4690
4691 #ifdef ASSERT
4692 // Don't catch signals while blocked; let the running threads have the signals.
4693 // (This allows a debugger to break into the running thread.)
4694 sigset_t oldsigs;
4695 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4696 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4697 #endif
4698
4699 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4700 jt->set_suspend_equivalent();
4701 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4702
4703 if (time == 0) {
4704 status = pthread_cond_wait (_cond, _mutex);
4705 } else {
4706 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4707 }
4708 assert_status(status == 0 || status == EINTR ||
4709 status == ETIME || status == ETIMEDOUT,
4710 status, "cond_timedwait");
4711
4712 #ifdef ASSERT
4713 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4714 #endif
4715
4716 _counter = 0;
4717 status = pthread_mutex_unlock(_mutex);
4718 assert_status(status == 0, status, "invariant");
4719 // If externally suspended while waiting, re-suspend
4720 if (jt->handle_special_suspend_equivalent_condition()) {
4721 jt->java_suspend_self();
4722 }
4723
4724 OrderAccess::fence();
4725 }
4726
4727 void Parker::unpark() {
4728 int s, status;
4729 status = pthread_mutex_lock(_mutex);
4730 assert (status == 0, "invariant");
4731 s = _counter;
4732 _counter = 1;
4733 if (s < 1) {
4734 status = pthread_mutex_unlock(_mutex);
4735 assert (status == 0, "invariant");
4736 status = pthread_cond_signal (_cond);
4737 assert (status == 0, "invariant");
4738 } else {
4739 pthread_mutex_unlock(_mutex);
4740 assert (status == 0, "invariant");
4741 }
4742 }
4743
4744 extern char** environ;
4745
4746 // Run the specified command in a separate process. Return its exit value,
4747 // or -1 on failure (e.g. can't fork a new process).
4748 // Unlike system(), this function can be called from signal handler. It
4749 // doesn't block SIGINT et al.
4750 int os::fork_and_exec(char* cmd) {
4751 char * argv[4] = {"sh", "-c", cmd, NULL};
4752
4753 pid_t pid = fork();
4754
4755 if (pid < 0) {
4756 // fork failed
4757 return -1;
4758
4759 } else if (pid == 0) {
4760 // child process
4761
4762 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4763 execve("/usr/bin/sh", argv, environ);
4764
4765 // execve failed
4766 _exit(-1);
4767
4768 } else {
4769 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4770 // care about the actual exit code, for now.
4771
4772 int status;
4773
4774 // Wait for the child process to exit. This returns immediately if
4775 // the child has already exited. */
4776 while (waitpid(pid, &status, 0) < 0) {
4777 switch (errno) {
4778 case ECHILD: return 0;
4779 case EINTR: break;
4780 default: return -1;
4781 }
4782 }
4783
4784 if (WIFEXITED(status)) {
4785 // The child exited normally; get its exit code.
4786 return WEXITSTATUS(status);
4787 } else if (WIFSIGNALED(status)) {
4788 // The child exited because of a signal.
4789 // The best value to return is 0x80 + signal number,
4790 // because that is what all Unix shells do, and because
4791 // it allows callers to distinguish between process exit and
4792 // process death by signal.
4793 return 0x80 + WTERMSIG(status);
4794 } else {
4795 // Unknown exit code; pass it through.
4796 return status;
4797 }
4798 }
4799 return -1;
4800 }
4801
4802 // is_headless_jre()
4803 //
4804 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4805 // in order to report if we are running in a headless jre.
4806 //
4807 // Since JDK8 xawt/libmawt.so is moved into the same directory
4808 // as libawt.so, and renamed libawt_xawt.so
4809 bool os::is_headless_jre() {
4810 struct stat statbuf;
4811 char buf[MAXPATHLEN];
4812 char libmawtpath[MAXPATHLEN];
4813 const char *xawtstr = "/xawt/libmawt.so";
4814 const char *new_xawtstr = "/libawt_xawt.so";
4815
4816 char *p;
4817
4818 // Get path to libjvm.so
4819 os::jvm_path(buf, sizeof(buf));
4820
4821 // Get rid of libjvm.so
4822 p = strrchr(buf, '/');
4823 if (p == NULL) return false;
4824 else *p = '\0';
4825
4826 // Get rid of client or server
4827 p = strrchr(buf, '/');
4828 if (p == NULL) return false;
4829 else *p = '\0';
4830
4831 // check xawt/libmawt.so
4832 strcpy(libmawtpath, buf);
4833 strcat(libmawtpath, xawtstr);
4834 if (::stat(libmawtpath, &statbuf) == 0) return false;
4835
4836 // check libawt_xawt.so
4837 strcpy(libmawtpath, buf);
4838 strcat(libmawtpath, new_xawtstr);
4839 if (::stat(libmawtpath, &statbuf) == 0) return false;
4840
4841 return true;
4842 }
4843
4844 // Get the default path to the core file
4845 // Returns the length of the string
4846 int os::get_core_path(char* buffer, size_t bufferSize) {
4847 const char* p = get_current_directory(buffer, bufferSize);
4848
4849 if (p == NULL) {
4850 assert(p != NULL, "failed to get current directory");
4851 return 0;
4852 }
4853
4854 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4855 p, current_process_id());
4856
4857 return strlen(buffer);
4858 }
4859
4860 #ifndef PRODUCT
4861 void TestReserveMemorySpecial_test() {
4862 // No tests available for this platform
4863 }
4864 #endif
4865
4866 bool os::start_debugging(char *buf, int buflen) {
4867 int len = (int)strlen(buf);
4868 char *p = &buf[len];
4869
4870 jio_snprintf(p, buflen -len,
4871 "\n\n"
4872 "Do you want to debug the problem?\n\n"
4873 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4874 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4875 "Otherwise, press RETURN to abort...",
4876 os::current_process_id(),
4877 os::current_thread_id(), thread_self());
4878
4879 bool yes = os::message_box("Unexpected Error", buf);
4880
4881 if (yes) {
4882 // yes, user asked VM to launch debugger
4883 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4884
4885 os::fork_and_exec(buf);
4886 yes = false;
4887 }
4888 return yes;
4889 }
4890
4891 static inline time_t get_mtime(const char* filename) {
4892 struct stat st;
4893 int ret = os::stat(filename, &st);
4894 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4895 return st.st_mtime;
4896 }
4897
4898 int os::compare_file_modified_times(const char* file1, const char* file2) {
4899 time_t t1 = get_mtime(file1);
4900 time_t t2 = get_mtime(file2);
4901 return t1 - t2;
4902 }
4903
4904 bool os::map_memory_to_file(char* base, size_t size, const char* backingFileDir) {
4905 VMError::report_and_die("Allocating object heap with backing file is not supported for AIX");
4906 return false;
4907 }