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 "oops/oop.inline.hpp"
48 #include "os_aix.inline.hpp"
49 #include "os_share_aix.hpp"
50 #include "porting_aix.hpp"
51 #include "prims/jniFastGetField.hpp"
52 #include "prims/jvm.h"
53 #include "prims/jvm_misc.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/atomic.inline.hpp"
56 #include "runtime/extendedPC.hpp"
57 #include "runtime/globals.hpp"
58 #include "runtime/interfaceSupport.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/mutexLocker.hpp"
62 #include "runtime/objectMonitor.hpp"
63 #include "runtime/orderAccess.inline.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/osThread.hpp"
66 #include "runtime/perfMemory.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/statSampler.hpp"
69 #include "runtime/stubRoutines.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/threadCritical.hpp"
72 #include "runtime/timer.hpp"
73 #include "runtime/vm_version.hpp"
74 #include "services/attachListener.hpp"
75 #include "services/runtimeService.hpp"
76 #include "utilities/decoder.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/growableArray.hpp"
80 #include "utilities/vmError.hpp"
81
82 // put OS-includes here (sorted alphabetically)
83 #include <errno.h>
84 #include <fcntl.h>
85 #include <inttypes.h>
86 #include <poll.h>
87 #include <procinfo.h>
88 #include <pthread.h>
89 #include <pwd.h>
90 #include <semaphore.h>
91 #include <signal.h>
92 #include <stdint.h>
93 #include <stdio.h>
94 #include <string.h>
95 #include <unistd.h>
96 #include <sys/ioctl.h>
97 #include <sys/ipc.h>
98 #include <sys/mman.h>
99 #include <sys/resource.h>
100 #include <sys/select.h>
101 #include <sys/shm.h>
102 #include <sys/socket.h>
103 #include <sys/stat.h>
104 #include <sys/sysinfo.h>
105 #include <sys/systemcfg.h>
106 #include <sys/time.h>
107 #include <sys/times.h>
108 #include <sys/types.h>
109 #include <sys/utsname.h>
110 #include <sys/vminfo.h>
111 #include <sys/wait.h>
112
113 // Missing prototypes for various system APIs.
114 extern "C"
115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
116
117 #if !defined(_AIXVERSION_610)
118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
120 extern "C" int getargs (procsinfo*, int, char*, int);
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // Query dimensions of the stack of the calling thread.
134 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
135 static address resolve_function_descriptor_to_code_pointer(address p);
136
137 static void vmembk_print_on(outputStream* os);
138
139 ////////////////////////////////////////////////////////////////////////////////
140 // global variables (for a description see os_aix.hpp)
141
142 julong os::Aix::_physical_memory = 0;
143
144 pthread_t os::Aix::_main_thread = ((pthread_t)0);
145 int os::Aix::_page_size = -1;
146
147 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
148 int os::Aix::_on_pase = -1;
149
150 // 0 = uninitialized, otherwise 32 bit number:
151 // 0xVVRRTTSS
152 // VV - major version
153 // RR - minor version
154 // TT - tech level, if known, 0 otherwise
155 // SS - service pack, if known, 0 otherwise
156 uint32_t os::Aix::_os_version = 0;
157
158 // -1 = uninitialized, 0 - no, 1 - yes
159 int os::Aix::_xpg_sus_mode = -1;
160
161 // -1 = uninitialized, 0 - no, 1 - yes
162 int os::Aix::_extshm = -1;
163
164 ////////////////////////////////////////////////////////////////////////////////
165 // local variables
166
167 static jlong initial_time_count = 0;
168 static int clock_tics_per_sec = 100;
169 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
170 static bool check_signals = true;
171 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
172 static sigset_t SR_sigset;
173
174 // Process break recorded at startup.
175 static address g_brk_at_startup = NULL;
176
177 // This describes the state of multipage support of the underlying
178 // OS. Note that this is of no interest to the outsize world and
179 // therefore should not be defined in AIX class.
180 //
181 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
182 // latter two (16M "large" resp. 16G "huge" pages) require special
183 // setup and are normally not available.
184 //
185 // AIX supports multiple page sizes per process, for:
186 // - Stack (of the primordial thread, so not relevant for us)
187 // - Data - data, bss, heap, for us also pthread stacks
188 // - Text - text code
189 // - shared memory
190 //
191 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
192 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
193 //
194 // For shared memory, page size can be set dynamically via
195 // shmctl(). Different shared memory regions can have different page
196 // sizes.
197 //
198 // More information can be found at AIBM info center:
199 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
200 //
201 static struct {
202 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
203 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
204 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
205 size_t pthr_stack_pagesize; // stack page size of pthread threads
206 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
207 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
208 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
209 int error; // Error describing if something went wrong at multipage init.
210 } g_multipage_support = {
211 (size_t) -1,
212 (size_t) -1,
213 (size_t) -1,
214 (size_t) -1,
215 (size_t) -1,
216 false, false,
217 0
218 };
219
220 // We must not accidentally allocate memory close to the BRK - even if
221 // that would work - because then we prevent the BRK segment from
222 // growing which may result in a malloc OOM even though there is
223 // enough memory. The problem only arises if we shmat() or mmap() at
224 // a specific wish address, e.g. to place the heap in a
225 // compressed-oops-friendly way.
226 static bool is_close_to_brk(address a) {
227 assert0(g_brk_at_startup != NULL);
228 if (a >= g_brk_at_startup &&
229 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
230 return true;
231 }
232 return false;
233 }
234
235 julong os::available_memory() {
236 return Aix::available_memory();
237 }
238
239 julong os::Aix::available_memory() {
240 // Avoid expensive API call here, as returned value will always be null.
241 if (os::Aix::on_pase()) {
242 return 0x0LL;
243 }
244 os::Aix::meminfo_t mi;
245 if (os::Aix::get_meminfo(&mi)) {
246 return mi.real_free;
247 } else {
248 return ULONG_MAX;
249 }
250 }
251
252 julong os::physical_memory() {
253 return Aix::physical_memory();
254 }
255
256 // Return true if user is running as root.
257
258 bool os::have_special_privileges() {
259 static bool init = false;
260 static bool privileges = false;
261 if (!init) {
262 privileges = (getuid() != geteuid()) || (getgid() != getegid());
263 init = true;
264 }
265 return privileges;
266 }
267
268 // Helper function, emulates disclaim64 using multiple 32bit disclaims
269 // because we cannot use disclaim64() on AS/400 and old AIX releases.
270 static bool my_disclaim64(char* addr, size_t size) {
271
272 if (size == 0) {
273 return true;
274 }
275
276 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
277 const unsigned int maxDisclaimSize = 0x40000000;
278
279 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
280 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
281
282 char* p = addr;
283
284 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
285 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
286 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
287 return false;
288 }
289 p += maxDisclaimSize;
290 }
291
292 if (lastDisclaimSize > 0) {
293 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
294 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
295 return false;
296 }
297 }
298
299 return true;
300 }
301
302 // Cpu architecture string
303 #if defined(PPC32)
304 static char cpu_arch[] = "ppc";
305 #elif defined(PPC64)
306 static char cpu_arch[] = "ppc64";
307 #else
308 #error Add appropriate cpu_arch setting
309 #endif
310
311 // Wrap the function "vmgetinfo" which is not available on older OS releases.
312 static int checked_vmgetinfo(void *out, int command, int arg) {
313 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
314 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
315 }
316 return ::vmgetinfo(out, command, arg);
317 }
318
319 // Given an address, returns the size of the page backing that address.
320 size_t os::Aix::query_pagesize(void* addr) {
321
322 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
323 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
324 return SIZE_4K;
325 }
326
327 vm_page_info pi;
328 pi.addr = (uint64_t)addr;
329 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
330 return pi.pagesize;
331 } else {
332 assert(false, "vmgetinfo failed to retrieve page size");
333 return SIZE_4K;
334 }
335 }
336
337 void os::Aix::initialize_system_info() {
338
339 // Get the number of online(logical) cpus instead of configured.
340 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
341 assert(_processor_count > 0, "_processor_count must be > 0");
342
343 // Retrieve total physical storage.
344 os::Aix::meminfo_t mi;
345 if (!os::Aix::get_meminfo(&mi)) {
346 assert(false, "os::Aix::get_meminfo failed.");
347 }
348 _physical_memory = (julong) mi.real_total;
349 }
350
351 // Helper function for tracing page sizes.
352 static const char* describe_pagesize(size_t pagesize) {
353 switch (pagesize) {
354 case SIZE_4K : return "4K";
355 case SIZE_64K: return "64K";
356 case SIZE_16M: return "16M";
357 case SIZE_16G: return "16G";
358 default:
359 assert(false, "surprise");
360 return "??";
361 }
362 }
363
364 // Probe OS for multipage support.
365 // Will fill the global g_multipage_support structure.
366 // Must be called before calling os::large_page_init().
367 static void query_multipage_support() {
368
369 guarantee(g_multipage_support.pagesize == -1,
370 "do not call twice");
371
372 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
373
374 // This really would surprise me.
375 assert(g_multipage_support.pagesize == SIZE_4K, "surprise!");
376
377 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
378 // Default data page size is defined either by linker options (-bdatapsize)
379 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
380 // default should be 4K.
381 {
382 void* p = ::malloc(SIZE_16M);
383 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
384 ::free(p);
385 }
386
387 // Query default shm page size (LDR_CNTRL SHMPSIZE).
388 // Note that this is pure curiosity. We do not rely on default page size but set
389 // our own page size after allocated.
390 {
391 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
392 guarantee(shmid != -1, "shmget failed");
393 void* p = ::shmat(shmid, NULL, 0);
394 ::shmctl(shmid, IPC_RMID, NULL);
395 guarantee(p != (void*) -1, "shmat failed");
396 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
397 ::shmdt(p);
398 }
399
400 // Before querying the stack page size, make sure we are not running as primordial
401 // thread (because primordial thread's stack may have different page size than
402 // pthread thread stacks). Running a VM on the primordial thread won't work for a
403 // number of reasons so we may just as well guarantee it here.
404 guarantee0(!os::Aix::is_primordial_thread());
405
406 // Query pthread stack page size. Should be the same as data page size because
407 // pthread stacks are allocated from C-Heap.
408 {
409 int dummy = 0;
410 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
411 }
412
413 // Query default text page size (LDR_CNTRL TEXTPSIZE).
414 {
415 address any_function =
416 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
417 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
418 }
419
420 // Now probe for support of 64K pages and 16M pages.
421
422 // Before OS/400 V6R1, there is no support for pages other than 4K.
423 if (os::Aix::on_pase_V5R4_or_older()) {
424 trcVerbose("OS/400 < V6R1 - no large page support.");
425 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
426 goto query_multipage_support_end;
427 }
428
429 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
430 {
431 const int MAX_PAGE_SIZES = 4;
432 psize_t sizes[MAX_PAGE_SIZES];
433 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
434 if (num_psizes == -1) {
435 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
436 trcVerbose("disabling multipage support.");
437 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
438 goto query_multipage_support_end;
439 }
440 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
441 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
442 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
443 for (int i = 0; i < num_psizes; i ++) {
444 trcVerbose(" %s ", describe_pagesize(sizes[i]));
445 }
446
447 // Can we use 64K, 16M pages?
448 for (int i = 0; i < num_psizes; i ++) {
449 const size_t pagesize = sizes[i];
450 if (pagesize != SIZE_64K && pagesize != SIZE_16M) {
451 continue;
452 }
453 bool can_use = false;
454 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
455 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
456 IPC_CREAT | S_IRUSR | S_IWUSR);
457 guarantee0(shmid != -1); // Should always work.
458 // Try to set pagesize.
459 struct shmid_ds shm_buf = { 0 };
460 shm_buf.shm_pagesize = pagesize;
461 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
462 const int en = errno;
463 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
464 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
465 errno);
466 } else {
467 // Attach and double check pageisze.
468 void* p = ::shmat(shmid, NULL, 0);
469 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
470 guarantee0(p != (void*) -1); // Should always work.
471 const size_t real_pagesize = os::Aix::query_pagesize(p);
472 if (real_pagesize != pagesize) {
473 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
474 } else {
475 can_use = true;
476 }
477 ::shmdt(p);
478 }
479 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
480 if (pagesize == SIZE_64K) {
481 g_multipage_support.can_use_64K_pages = can_use;
482 } else if (pagesize == SIZE_16M) {
483 g_multipage_support.can_use_16M_pages = can_use;
484 }
485 }
486
487 } // end: check which pages can be used for shared memory
488
489 query_multipage_support_end:
490
491 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
492 describe_pagesize(g_multipage_support.pagesize));
493 trcVerbose("Data page size (C-Heap, bss, etc): %s",
494 describe_pagesize(g_multipage_support.datapsize));
495 trcVerbose("Text page size: %s",
496 describe_pagesize(g_multipage_support.textpsize));
497 trcVerbose("Thread stack page size (pthread): %s",
498 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
499 trcVerbose("Default shared memory page size: %s",
500 describe_pagesize(g_multipage_support.shmpsize));
501 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
502 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
503 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
504 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
505 trcVerbose("Multipage error details: %d",
506 g_multipage_support.error);
507
508 // sanity checks
509 assert0(g_multipage_support.pagesize == SIZE_4K);
510 assert0(g_multipage_support.datapsize == SIZE_4K || g_multipage_support.datapsize == SIZE_64K);
511 assert0(g_multipage_support.textpsize == SIZE_4K || g_multipage_support.textpsize == SIZE_64K);
512 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
513 assert0(g_multipage_support.shmpsize == SIZE_4K || g_multipage_support.shmpsize == SIZE_64K);
514
515 }
516
517 void os::init_system_properties_values() {
518
519 #define DEFAULT_LIBPATH "/lib:/usr/lib"
520 #define EXTENSIONS_DIR "/lib/ext"
521
522 // Buffer that fits several sprintfs.
523 // Note that the space for the trailing null is provided
524 // by the nulls included by the sizeof operator.
525 const size_t bufsize =
526 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
527 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
528 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
529
530 // sysclasspath, java_home, dll_dir
531 {
532 char *pslash;
533 os::jvm_path(buf, bufsize);
534
535 // Found the full path to libjvm.so.
536 // Now cut the path to <java_home>/jre if we can.
537 pslash = strrchr(buf, '/');
538 if (pslash != NULL) {
539 *pslash = '\0'; // Get rid of /libjvm.so.
540 }
541 pslash = strrchr(buf, '/');
542 if (pslash != NULL) {
543 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
544 }
545 Arguments::set_dll_dir(buf);
546
547 if (pslash != NULL) {
548 pslash = strrchr(buf, '/');
549 if (pslash != NULL) {
550 *pslash = '\0'; // Get rid of /<arch>.
551 pslash = strrchr(buf, '/');
552 if (pslash != NULL) {
553 *pslash = '\0'; // Get rid of /lib.
554 }
555 }
556 }
557 Arguments::set_java_home(buf);
558 set_boot_path('/', ':');
559 }
560
561 // Where to look for native libraries.
562
563 // On Aix we get the user setting of LIBPATH.
564 // Eventually, all the library path setting will be done here.
565 // Get the user setting of LIBPATH.
566 const char *v = ::getenv("LIBPATH");
567 const char *v_colon = ":";
568 if (v == NULL) { v = ""; v_colon = ""; }
569
570 // Concatenate user and invariant part of ld_library_path.
571 // That's +1 for the colon and +1 for the trailing '\0'.
572 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
573 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
574 Arguments::set_library_path(ld_library_path);
575 FREE_C_HEAP_ARRAY(char, ld_library_path);
576
577 // Extensions directories.
578 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
579 Arguments::set_ext_dirs(buf);
580
581 FREE_C_HEAP_ARRAY(char, buf);
582
583 #undef DEFAULT_LIBPATH
584 #undef EXTENSIONS_DIR
585 }
586
587 ////////////////////////////////////////////////////////////////////////////////
588 // breakpoint support
589
590 void os::breakpoint() {
591 BREAKPOINT;
592 }
593
594 extern "C" void breakpoint() {
595 // use debugger to set breakpoint here
596 }
597
598 ////////////////////////////////////////////////////////////////////////////////
599 // signal support
600
601 debug_only(static bool signal_sets_initialized = false);
602 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
603
604 bool os::Aix::is_sig_ignored(int sig) {
605 struct sigaction oact;
606 sigaction(sig, (struct sigaction*)NULL, &oact);
607 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
608 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
609 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
610 return true;
611 } else {
612 return false;
613 }
614 }
615
616 void os::Aix::signal_sets_init() {
617 // Should also have an assertion stating we are still single-threaded.
618 assert(!signal_sets_initialized, "Already initialized");
619 // Fill in signals that are necessarily unblocked for all threads in
620 // the VM. Currently, we unblock the following signals:
621 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
622 // by -Xrs (=ReduceSignalUsage));
623 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
624 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
625 // the dispositions or masks wrt these signals.
626 // Programs embedding the VM that want to use the above signals for their
627 // own purposes must, at this time, use the "-Xrs" option to prevent
628 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
629 // (See bug 4345157, and other related bugs).
630 // In reality, though, unblocking these signals is really a nop, since
631 // these signals are not blocked by default.
632 sigemptyset(&unblocked_sigs);
633 sigemptyset(&allowdebug_blocked_sigs);
634 sigaddset(&unblocked_sigs, SIGILL);
635 sigaddset(&unblocked_sigs, SIGSEGV);
636 sigaddset(&unblocked_sigs, SIGBUS);
637 sigaddset(&unblocked_sigs, SIGFPE);
638 sigaddset(&unblocked_sigs, SIGTRAP);
639 sigaddset(&unblocked_sigs, SIGDANGER);
640 sigaddset(&unblocked_sigs, SR_signum);
641
642 if (!ReduceSignalUsage) {
643 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
644 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
645 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
646 }
647 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
648 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
649 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
650 }
651 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
652 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
653 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
654 }
655 }
656 // Fill in signals that are blocked by all but the VM thread.
657 sigemptyset(&vm_sigs);
658 if (!ReduceSignalUsage)
659 sigaddset(&vm_sigs, BREAK_SIGNAL);
660 debug_only(signal_sets_initialized = true);
661 }
662
663 // These are signals that are unblocked while a thread is running Java.
664 // (For some reason, they get blocked by default.)
665 sigset_t* os::Aix::unblocked_signals() {
666 assert(signal_sets_initialized, "Not initialized");
667 return &unblocked_sigs;
668 }
669
670 // These are the signals that are blocked while a (non-VM) thread is
671 // running Java. Only the VM thread handles these signals.
672 sigset_t* os::Aix::vm_signals() {
673 assert(signal_sets_initialized, "Not initialized");
674 return &vm_sigs;
675 }
676
677 // These are signals that are blocked during cond_wait to allow debugger in
678 sigset_t* os::Aix::allowdebug_blocked_signals() {
679 assert(signal_sets_initialized, "Not initialized");
680 return &allowdebug_blocked_sigs;
681 }
682
683 void os::Aix::hotspot_sigmask(Thread* thread) {
684
685 //Save caller's signal mask before setting VM signal mask
686 sigset_t caller_sigmask;
687 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
688
689 OSThread* osthread = thread->osthread();
690 osthread->set_caller_sigmask(caller_sigmask);
691
692 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
693
694 if (!ReduceSignalUsage) {
695 if (thread->is_VM_thread()) {
696 // Only the VM thread handles BREAK_SIGNAL ...
697 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
698 } else {
699 // ... all other threads block BREAK_SIGNAL
700 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
701 }
702 }
703 }
704
705 // retrieve memory information.
706 // Returns false if something went wrong;
707 // content of pmi undefined in this case.
708 bool os::Aix::get_meminfo(meminfo_t* pmi) {
709
710 assert(pmi, "get_meminfo: invalid parameter");
711
712 memset(pmi, 0, sizeof(meminfo_t));
713
714 if (os::Aix::on_pase()) {
715 // On PASE, use the libo4 porting library.
716
717 unsigned long long virt_total = 0;
718 unsigned long long real_total = 0;
719 unsigned long long real_free = 0;
720 unsigned long long pgsp_total = 0;
721 unsigned long long pgsp_free = 0;
722 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
723 pmi->virt_total = virt_total;
724 pmi->real_total = real_total;
725 pmi->real_free = real_free;
726 pmi->pgsp_total = pgsp_total;
727 pmi->pgsp_free = pgsp_free;
728 return true;
729 }
730 return false;
731
732 } else {
733
734 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
735 // See:
736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
737 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
738 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
739 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
740
741 perfstat_memory_total_t psmt;
742 memset (&psmt, '\0', sizeof(psmt));
743 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
744 if (rc == -1) {
745 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
746 assert(0, "perfstat_memory_total() failed");
747 return false;
748 }
749
750 assert(rc == 1, "perfstat_memory_total() - weird return code");
751
752 // excerpt from
753 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
754 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
755 // The fields of perfstat_memory_total_t:
756 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
757 // u_longlong_t real_total Total real memory (in 4 KB pages).
758 // u_longlong_t real_free Free real memory (in 4 KB pages).
759 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
760 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
761
762 pmi->virt_total = psmt.virt_total * 4096;
763 pmi->real_total = psmt.real_total * 4096;
764 pmi->real_free = psmt.real_free * 4096;
765 pmi->pgsp_total = psmt.pgsp_total * 4096;
766 pmi->pgsp_free = psmt.pgsp_free * 4096;
767
768 return true;
769
770 }
771 } // end os::Aix::get_meminfo
772
773 //////////////////////////////////////////////////////////////////////////////
774 // create new thread
775
776 // Thread start routine for all newly created threads
777 static void *thread_native_entry(Thread *thread) {
778
779 // find out my own stack dimensions
780 {
781 // actually, this should do exactly the same as thread->record_stack_base_and_size...
782 address base = 0;
783 size_t size = 0;
784 query_stack_dimensions(&base, &size);
785 thread->set_stack_base(base);
786 thread->set_stack_size(size);
787 }
788
789 const pthread_t pthread_id = ::pthread_self();
790 const tid_t kernel_thread_id = ::thread_self();
791
792 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
793 os::current_thread_id(), (uintx) kernel_thread_id);
794
795 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
796 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
797 // tools hook pthread_create(). In this case, we may run into problems establishing
798 // guard pages on those stacks, because the stacks may reside in memory which is not
799 // protectable (shmated).
800 if (thread->stack_base() > ::sbrk(0)) {
801 log_warning(os, thread)("Thread stack not in data segment.");
802 }
803
804 // Try to randomize the cache line index of hot stack frames.
805 // This helps when threads of the same stack traces evict each other's
806 // cache lines. The threads can be either from the same JVM instance, or
807 // from different JVM instances. The benefit is especially true for
808 // processors with hyperthreading technology.
809
810 static int counter = 0;
811 int pid = os::current_process_id();
812 alloca(((pid ^ counter++) & 7) * 128);
813
814 thread->initialize_thread_current();
815
816 OSThread* osthread = thread->osthread();
817
818 // Thread_id is pthread id.
819 osthread->set_thread_id(pthread_id);
820
821 // .. but keep kernel thread id too for diagnostics
822 osthread->set_kernel_thread_id(kernel_thread_id);
823
824 // Initialize signal mask for this thread.
825 os::Aix::hotspot_sigmask(thread);
826
827 // Initialize floating point control register.
828 os::Aix::init_thread_fpu_state();
829
830 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
831
832 // Call one more level start routine.
833 thread->run();
834
835 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
836 os::current_thread_id(), (uintx) kernel_thread_id);
837
838 // If a thread has not deleted itself ("delete this") as part of its
839 // termination sequence, we have to ensure thread-local-storage is
840 // cleared before we actually terminate. No threads should ever be
841 // deleted asynchronously with respect to their termination.
842 if (Thread::current_or_null_safe() != NULL) {
843 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
844 thread->clear_thread_current();
845 }
846
847 return 0;
848 }
849
850 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
851
852 assert(thread->osthread() == NULL, "caller responsible");
853
854 // Allocate the OSThread object
855 OSThread* osthread = new OSThread(NULL, NULL);
856 if (osthread == NULL) {
857 return false;
858 }
859
860 // set the correct thread state
861 osthread->set_thread_type(thr_type);
862
863 // Initial state is ALLOCATED but not INITIALIZED
864 osthread->set_state(ALLOCATED);
865
866 thread->set_osthread(osthread);
867
868 // init thread attributes
869 pthread_attr_t attr;
870 pthread_attr_init(&attr);
871 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
872
873 // Make sure we run in 1:1 kernel-user-thread mode.
874 if (os::Aix::on_aix()) {
875 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
876 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
877 } // end: aix
878
879 // Start in suspended state, and in os::thread_start, wake the thread up.
880 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
881
882 // calculate stack size if it's not specified by caller
883 if (stack_size == 0) {
884 stack_size = os::Aix::default_stack_size(thr_type);
885
886 switch (thr_type) {
887 case os::java_thread:
888 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
889 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
890 stack_size = JavaThread::stack_size_at_create();
891 break;
892 case os::compiler_thread:
893 if (CompilerThreadStackSize > 0) {
894 stack_size = (size_t)(CompilerThreadStackSize * K);
895 break;
896 } // else fall through:
897 // use VMThreadStackSize if CompilerThreadStackSize is not defined
898 case os::vm_thread:
899 case os::pgc_thread:
900 case os::cgc_thread:
901 case os::watcher_thread:
902 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
903 break;
904 }
905 }
906
907 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
908 pthread_attr_setstacksize(&attr, stack_size);
909
910 pthread_t tid;
911 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
912
913
914 char buf[64];
915 if (ret == 0) {
916 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
917 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
918 } else {
919 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
920 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
921 }
922
923 pthread_attr_destroy(&attr);
924
925 if (ret != 0) {
926 // Need to clean up stuff we've allocated so far
927 thread->set_osthread(NULL);
928 delete osthread;
929 return false;
930 }
931
932 // OSThread::thread_id is the pthread id.
933 osthread->set_thread_id(tid);
934
935 return true;
936 }
937
938 /////////////////////////////////////////////////////////////////////////////
939 // attach existing thread
940
941 // bootstrap the main thread
942 bool os::create_main_thread(JavaThread* thread) {
943 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
944 return create_attached_thread(thread);
945 }
946
947 bool os::create_attached_thread(JavaThread* thread) {
948 #ifdef ASSERT
949 thread->verify_not_published();
950 #endif
951
952 // Allocate the OSThread object
953 OSThread* osthread = new OSThread(NULL, NULL);
954
955 if (osthread == NULL) {
956 return false;
957 }
958
959 const pthread_t pthread_id = ::pthread_self();
960 const tid_t kernel_thread_id = ::thread_self();
961
962 // OSThread::thread_id is the pthread id.
963 osthread->set_thread_id(pthread_id);
964
965 // .. but keep kernel thread id too for diagnostics
966 osthread->set_kernel_thread_id(kernel_thread_id);
967
968 // initialize floating point control register
969 os::Aix::init_thread_fpu_state();
970
971 // Initial thread state is RUNNABLE
972 osthread->set_state(RUNNABLE);
973
974 thread->set_osthread(osthread);
975
976 if (UseNUMA) {
977 int lgrp_id = os::numa_get_group_id();
978 if (lgrp_id != -1) {
979 thread->set_lgrp_id(lgrp_id);
980 }
981 }
982
983 // initialize signal mask for this thread
984 // and save the caller's signal mask
985 os::Aix::hotspot_sigmask(thread);
986
987 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
988 os::current_thread_id(), (uintx) kernel_thread_id);
989
990 return true;
991 }
992
993 void os::pd_start_thread(Thread* thread) {
994 int status = pthread_continue_np(thread->osthread()->pthread_id());
995 assert(status == 0, "thr_continue failed");
996 }
997
998 // Free OS resources related to the OSThread
999 void os::free_thread(OSThread* osthread) {
1000 assert(osthread != NULL, "osthread not set");
1001
1002 // We are told to free resources of the argument thread,
1003 // but we can only really operate on the current thread.
1004 assert(Thread::current()->osthread() == osthread,
1005 "os::free_thread but not current thread");
1006
1007 // Restore caller's signal mask
1008 sigset_t sigmask = osthread->caller_sigmask();
1009 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1010
1011 delete osthread;
1012 }
1013
1014 ////////////////////////////////////////////////////////////////////////////////
1015 // time support
1016
1017 // Time since start-up in seconds to a fine granularity.
1018 // Used by VMSelfDestructTimer and the MemProfiler.
1019 double os::elapsedTime() {
1020 return (double)(os::elapsed_counter()) * 0.000001;
1021 }
1022
1023 jlong os::elapsed_counter() {
1024 timeval time;
1025 int status = gettimeofday(&time, NULL);
1026 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1027 }
1028
1029 jlong os::elapsed_frequency() {
1030 return (1000 * 1000);
1031 }
1032
1033 bool os::supports_vtime() { return true; }
1034 bool os::enable_vtime() { return false; }
1035 bool os::vtime_enabled() { return false; }
1036
1037 double os::elapsedVTime() {
1038 struct rusage usage;
1039 int retval = getrusage(RUSAGE_THREAD, &usage);
1040 if (retval == 0) {
1041 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1042 } else {
1043 // better than nothing, but not much
1044 return elapsedTime();
1045 }
1046 }
1047
1048 jlong os::javaTimeMillis() {
1049 timeval time;
1050 int status = gettimeofday(&time, NULL);
1051 assert(status != -1, "aix error at gettimeofday()");
1052 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1053 }
1054
1055 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1056 timeval time;
1057 int status = gettimeofday(&time, NULL);
1058 assert(status != -1, "aix error at gettimeofday()");
1059 seconds = jlong(time.tv_sec);
1060 nanos = jlong(time.tv_usec) * 1000;
1061 }
1062
1063 jlong os::javaTimeNanos() {
1064 if (os::Aix::on_pase()) {
1065
1066 timeval time;
1067 int status = gettimeofday(&time, NULL);
1068 assert(status != -1, "PASE error at gettimeofday()");
1069 jlong usecs = jlong((unsigned long long) time.tv_sec * (1000 * 1000) + time.tv_usec);
1070 return 1000 * usecs;
1071
1072 } else {
1073 // On AIX use the precision of processors real time clock
1074 // or time base registers.
1075 timebasestruct_t time;
1076 int rc;
1077
1078 // If the CPU has a time register, it will be used and
1079 // we have to convert to real time first. After convertion we have following data:
1080 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1081 // time.tb_low [nanoseconds after the last full second above]
1082 // We better use mread_real_time here instead of read_real_time
1083 // to ensure that we will get a monotonic increasing time.
1084 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1085 rc = time_base_to_time(&time, TIMEBASE_SZ);
1086 assert(rc != -1, "aix error at time_base_to_time()");
1087 }
1088 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1089 }
1090 }
1091
1092 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1093 info_ptr->max_value = ALL_64_BITS;
1094 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1095 info_ptr->may_skip_backward = false;
1096 info_ptr->may_skip_forward = false;
1097 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1098 }
1099
1100 // Return the real, user, and system times in seconds from an
1101 // arbitrary fixed point in the past.
1102 bool os::getTimesSecs(double* process_real_time,
1103 double* process_user_time,
1104 double* process_system_time) {
1105 struct tms ticks;
1106 clock_t real_ticks = times(&ticks);
1107
1108 if (real_ticks == (clock_t) (-1)) {
1109 return false;
1110 } else {
1111 double ticks_per_second = (double) clock_tics_per_sec;
1112 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1113 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1114 *process_real_time = ((double) real_ticks) / ticks_per_second;
1115
1116 return true;
1117 }
1118 }
1119
1120 char * os::local_time_string(char *buf, size_t buflen) {
1121 struct tm t;
1122 time_t long_time;
1123 time(&long_time);
1124 localtime_r(&long_time, &t);
1125 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1126 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1127 t.tm_hour, t.tm_min, t.tm_sec);
1128 return buf;
1129 }
1130
1131 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1132 return localtime_r(clock, res);
1133 }
1134
1135 ////////////////////////////////////////////////////////////////////////////////
1136 // runtime exit support
1137
1138 // Note: os::shutdown() might be called very early during initialization, or
1139 // called from signal handler. Before adding something to os::shutdown(), make
1140 // sure it is async-safe and can handle partially initialized VM.
1141 void os::shutdown() {
1142
1143 // allow PerfMemory to attempt cleanup of any persistent resources
1144 perfMemory_exit();
1145
1146 // needs to remove object in file system
1147 AttachListener::abort();
1148
1149 // flush buffered output, finish log files
1150 ostream_abort();
1151
1152 // Check for abort hook
1153 abort_hook_t abort_hook = Arguments::abort_hook();
1154 if (abort_hook != NULL) {
1155 abort_hook();
1156 }
1157 }
1158
1159 // Note: os::abort() might be called very early during initialization, or
1160 // called from signal handler. Before adding something to os::abort(), make
1161 // sure it is async-safe and can handle partially initialized VM.
1162 void os::abort(bool dump_core, void* siginfo, const void* context) {
1163 os::shutdown();
1164 if (dump_core) {
1165 #ifndef PRODUCT
1166 fdStream out(defaultStream::output_fd());
1167 out.print_raw("Current thread is ");
1168 char buf[16];
1169 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1170 out.print_raw_cr(buf);
1171 out.print_raw_cr("Dumping core ...");
1172 #endif
1173 ::abort(); // dump core
1174 }
1175
1176 ::exit(1);
1177 }
1178
1179 // Die immediately, no exit hook, no abort hook, no cleanup.
1180 void os::die() {
1181 ::abort();
1182 }
1183
1184 // This method is a copy of JDK's sysGetLastErrorString
1185 // from src/solaris/hpi/src/system_md.c
1186
1187 size_t os::lasterror(char *buf, size_t len) {
1188 if (errno == 0) return 0;
1189
1190 const char *s = os::strerror(errno);
1191 size_t n = ::strlen(s);
1192 if (n >= len) {
1193 n = len - 1;
1194 }
1195 ::strncpy(buf, s, n);
1196 buf[n] = '\0';
1197 return n;
1198 }
1199
1200 intx os::current_thread_id() {
1201 return (intx)pthread_self();
1202 }
1203
1204 int os::current_process_id() {
1205 return getpid();
1206 }
1207
1208 // DLL functions
1209
1210 const char* os::dll_file_extension() { return ".so"; }
1211
1212 // This must be hard coded because it's the system's temporary
1213 // directory not the java application's temp directory, ala java.io.tmpdir.
1214 const char* os::get_temp_directory() { return "/tmp"; }
1215
1216 static bool file_exists(const char* filename) {
1217 struct stat statbuf;
1218 if (filename == NULL || strlen(filename) == 0) {
1219 return false;
1220 }
1221 return os::stat(filename, &statbuf) == 0;
1222 }
1223
1224 bool os::dll_build_name(char* buffer, size_t buflen,
1225 const char* pname, const char* fname) {
1226 bool retval = false;
1227 // Copied from libhpi
1228 const size_t pnamelen = pname ? strlen(pname) : 0;
1229
1230 // Return error on buffer overflow.
1231 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1232 *buffer = '\0';
1233 return retval;
1234 }
1235
1236 if (pnamelen == 0) {
1237 snprintf(buffer, buflen, "lib%s.so", fname);
1238 retval = true;
1239 } else if (strchr(pname, *os::path_separator()) != NULL) {
1240 int n;
1241 char** pelements = split_path(pname, &n);
1242 if (pelements == NULL) {
1243 return false;
1244 }
1245 for (int i = 0; i < n; i++) {
1246 // Really shouldn't be NULL, but check can't hurt
1247 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1248 continue; // skip the empty path values
1249 }
1250 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1251 if (file_exists(buffer)) {
1252 retval = true;
1253 break;
1254 }
1255 }
1256 // release the storage
1257 for (int i = 0; i < n; i++) {
1258 if (pelements[i] != NULL) {
1259 FREE_C_HEAP_ARRAY(char, pelements[i]);
1260 }
1261 }
1262 if (pelements != NULL) {
1263 FREE_C_HEAP_ARRAY(char*, pelements);
1264 }
1265 } else {
1266 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1267 retval = true;
1268 }
1269 return retval;
1270 }
1271
1272 // Check if addr is inside libjvm.so.
1273 bool os::address_is_in_vm(address addr) {
1274
1275 // Input could be a real pc or a function pointer literal. The latter
1276 // would be a function descriptor residing in the data segment of a module.
1277 loaded_module_t lm;
1278 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1279 return lm.is_in_vm;
1280 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1281 return lm.is_in_vm;
1282 } else {
1283 return false;
1284 }
1285
1286 }
1287
1288 // Resolve an AIX function descriptor literal to a code pointer.
1289 // If the input is a valid code pointer to a text segment of a loaded module,
1290 // it is returned unchanged.
1291 // If the input is a valid AIX function descriptor, it is resolved to the
1292 // code entry point.
1293 // If the input is neither a valid function descriptor nor a valid code pointer,
1294 // NULL is returned.
1295 static address resolve_function_descriptor_to_code_pointer(address p) {
1296
1297 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1298 // It is a real code pointer.
1299 return p;
1300 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1301 // Pointer to data segment, potential function descriptor.
1302 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1303 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1304 // It is a function descriptor.
1305 return code_entry;
1306 }
1307 }
1308
1309 return NULL;
1310 }
1311
1312 bool os::dll_address_to_function_name(address addr, char *buf,
1313 int buflen, int *offset,
1314 bool demangle) {
1315 if (offset) {
1316 *offset = -1;
1317 }
1318 // Buf is not optional, but offset is optional.
1319 assert(buf != NULL, "sanity check");
1320 buf[0] = '\0';
1321
1322 // Resolve function ptr literals first.
1323 addr = resolve_function_descriptor_to_code_pointer(addr);
1324 if (!addr) {
1325 return false;
1326 }
1327
1328 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1329 }
1330
1331 bool os::dll_address_to_library_name(address addr, char* buf,
1332 int buflen, int* offset) {
1333 if (offset) {
1334 *offset = -1;
1335 }
1336 // Buf is not optional, but offset is optional.
1337 assert(buf != NULL, "sanity check");
1338 buf[0] = '\0';
1339
1340 // Resolve function ptr literals first.
1341 addr = resolve_function_descriptor_to_code_pointer(addr);
1342 if (!addr) {
1343 return false;
1344 }
1345
1346 return AixSymbols::get_module_name(addr, buf, buflen);
1347 }
1348
1349 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1350 // for the same architecture as Hotspot is running on.
1351 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1352
1353 if (ebuf && ebuflen > 0) {
1354 ebuf[0] = '\0';
1355 ebuf[ebuflen - 1] = '\0';
1356 }
1357
1358 if (!filename || strlen(filename) == 0) {
1359 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1360 return NULL;
1361 }
1362
1363 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1364 void * result= ::dlopen(filename, RTLD_LAZY);
1365 if (result != NULL) {
1366 // Reload dll cache. Don't do this in signal handling.
1367 LoadedLibraries::reload();
1368 return result;
1369 } else {
1370 // error analysis when dlopen fails
1371 const char* const error_report = ::dlerror();
1372 if (error_report && ebuf && ebuflen > 0) {
1373 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1374 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1375 }
1376 }
1377 return NULL;
1378 }
1379
1380 void* os::dll_lookup(void* handle, const char* name) {
1381 void* res = dlsym(handle, name);
1382 return res;
1383 }
1384
1385 void* os::get_default_process_handle() {
1386 return (void*)::dlopen(NULL, RTLD_LAZY);
1387 }
1388
1389 void os::print_dll_info(outputStream *st) {
1390 st->print_cr("Dynamic libraries:");
1391 LoadedLibraries::print(st);
1392 }
1393
1394 void os::get_summary_os_info(char* buf, size_t buflen) {
1395 // There might be something more readable than uname results for AIX.
1396 struct utsname name;
1397 uname(&name);
1398 snprintf(buf, buflen, "%s %s", name.release, name.version);
1399 }
1400
1401 void os::print_os_info(outputStream* st) {
1402 st->print("OS:");
1403
1404 st->print("uname:");
1405 struct utsname name;
1406 uname(&name);
1407 st->print(name.sysname); st->print(" ");
1408 st->print(name.nodename); st->print(" ");
1409 st->print(name.release); st->print(" ");
1410 st->print(name.version); st->print(" ");
1411 st->print(name.machine);
1412 st->cr();
1413
1414 uint32_t ver = os::Aix::os_version();
1415 st->print_cr("AIX kernel version %u.%u.%u.%u",
1416 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1417
1418 // rlimit
1419 st->print("rlimit:");
1420 struct rlimit rlim;
1421
1422 st->print(" STACK ");
1423 getrlimit(RLIMIT_STACK, &rlim);
1424 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1425 else st->print("%uk", rlim.rlim_cur >> 10);
1426
1427 st->print(", CORE ");
1428 getrlimit(RLIMIT_CORE, &rlim);
1429 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1430 else st->print("%uk", rlim.rlim_cur >> 10);
1431
1432 st->print(", NPROC ");
1433 st->print("%d", sysconf(_SC_CHILD_MAX));
1434
1435 st->print(", NOFILE ");
1436 getrlimit(RLIMIT_NOFILE, &rlim);
1437 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1438 else st->print("%d", rlim.rlim_cur);
1439
1440 st->print(", AS ");
1441 getrlimit(RLIMIT_AS, &rlim);
1442 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1443 else st->print("%uk", rlim.rlim_cur >> 10);
1444
1445 // Print limits on DATA, because it limits the C-heap.
1446 st->print(", DATA ");
1447 getrlimit(RLIMIT_DATA, &rlim);
1448 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1449 else st->print("%uk", rlim.rlim_cur >> 10);
1450 st->cr();
1451
1452 // load average
1453 st->print("load average:");
1454 double loadavg[3] = {-1.L, -1.L, -1.L};
1455 os::loadavg(loadavg, 3);
1456 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1457 st->cr();
1458
1459 // print wpar info
1460 libperfstat::wparinfo_t wi;
1461 if (libperfstat::get_wparinfo(&wi)) {
1462 st->print_cr("wpar info");
1463 st->print_cr("name: %s", wi.name);
1464 st->print_cr("id: %d", wi.wpar_id);
1465 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1466 }
1467
1468 // print partition info
1469 libperfstat::partitioninfo_t pi;
1470 if (libperfstat::get_partitioninfo(&pi)) {
1471 st->print_cr("partition info");
1472 st->print_cr(" name: %s", pi.name);
1473 }
1474
1475 }
1476
1477 void os::print_memory_info(outputStream* st) {
1478
1479 st->print_cr("Memory:");
1480
1481 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1482 describe_pagesize(g_multipage_support.pagesize));
1483 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1484 describe_pagesize(g_multipage_support.datapsize));
1485 st->print_cr(" Text page size: %s",
1486 describe_pagesize(g_multipage_support.textpsize));
1487 st->print_cr(" Thread stack page size (pthread): %s",
1488 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1489 st->print_cr(" Default shared memory page size: %s",
1490 describe_pagesize(g_multipage_support.shmpsize));
1491 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1492 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1493 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1494 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1495 st->print_cr(" Multipage error: %d",
1496 g_multipage_support.error);
1497 st->cr();
1498 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1499
1500 // print out LDR_CNTRL because it affects the default page sizes
1501 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1502 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1503
1504 // Print out EXTSHM because it is an unsupported setting.
1505 const char* const extshm = ::getenv("EXTSHM");
1506 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1507 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1508 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1509 }
1510
1511 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1512 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1513 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1514 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1515
1516 os::Aix::meminfo_t mi;
1517 if (os::Aix::get_meminfo(&mi)) {
1518 char buffer[256];
1519 if (os::Aix::on_aix()) {
1520 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1521 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1522 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1523 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1524 } else {
1525 // PASE - Numbers are result of QWCRSSTS; they mean:
1526 // real_total: Sum of all system pools
1527 // real_free: always 0
1528 // pgsp_total: we take the size of the system ASP
1529 // pgsp_free: size of system ASP times percentage of system ASP unused
1530 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1531 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1532 st->print_cr("%% system asp used : " SIZE_FORMAT,
1533 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1534 }
1535 st->print_raw(buffer);
1536 }
1537 st->cr();
1538
1539 // Print segments allocated with os::reserve_memory.
1540 st->print_cr("internal virtual memory regions used by vm:");
1541 vmembk_print_on(st);
1542 }
1543
1544 // Get a string for the cpuinfo that is a summary of the cpu type
1545 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1546 // This looks good
1547 libperfstat::cpuinfo_t ci;
1548 if (libperfstat::get_cpuinfo(&ci)) {
1549 strncpy(buf, ci.version, buflen);
1550 } else {
1551 strncpy(buf, "AIX", buflen);
1552 }
1553 }
1554
1555 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1556 st->print("CPU:");
1557 st->print("total %d", os::processor_count());
1558 // It's not safe to query number of active processors after crash.
1559 // st->print("(active %d)", os::active_processor_count());
1560 st->print(" %s", VM_Version::features());
1561 st->cr();
1562 }
1563
1564 static void print_signal_handler(outputStream* st, int sig,
1565 char* buf, size_t buflen);
1566
1567 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1568 st->print_cr("Signal Handlers:");
1569 print_signal_handler(st, SIGSEGV, buf, buflen);
1570 print_signal_handler(st, SIGBUS , buf, buflen);
1571 print_signal_handler(st, SIGFPE , buf, buflen);
1572 print_signal_handler(st, SIGPIPE, buf, buflen);
1573 print_signal_handler(st, SIGXFSZ, buf, buflen);
1574 print_signal_handler(st, SIGILL , buf, buflen);
1575 print_signal_handler(st, SR_signum, buf, buflen);
1576 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1577 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1578 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1579 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1580 print_signal_handler(st, SIGTRAP, buf, buflen);
1581 print_signal_handler(st, SIGDANGER, buf, buflen);
1582 }
1583
1584 static char saved_jvm_path[MAXPATHLEN] = {0};
1585
1586 // Find the full path to the current module, libjvm.so.
1587 void os::jvm_path(char *buf, jint buflen) {
1588 // Error checking.
1589 if (buflen < MAXPATHLEN) {
1590 assert(false, "must use a large-enough buffer");
1591 buf[0] = '\0';
1592 return;
1593 }
1594 // Lazy resolve the path to current module.
1595 if (saved_jvm_path[0] != 0) {
1596 strcpy(buf, saved_jvm_path);
1597 return;
1598 }
1599
1600 Dl_info dlinfo;
1601 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1602 assert(ret != 0, "cannot locate libjvm");
1603 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1604 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1605
1606 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1607 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1608 }
1609
1610 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1611 // no prefix required, not even "_"
1612 }
1613
1614 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1615 // no suffix required
1616 }
1617
1618 ////////////////////////////////////////////////////////////////////////////////
1619 // sun.misc.Signal support
1620
1621 static volatile jint sigint_count = 0;
1622
1623 static void
1624 UserHandler(int sig, void *siginfo, void *context) {
1625 // 4511530 - sem_post is serialized and handled by the manager thread. When
1626 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1627 // don't want to flood the manager thread with sem_post requests.
1628 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1629 return;
1630
1631 // Ctrl-C is pressed during error reporting, likely because the error
1632 // handler fails to abort. Let VM die immediately.
1633 if (sig == SIGINT && is_error_reported()) {
1634 os::die();
1635 }
1636
1637 os::signal_notify(sig);
1638 }
1639
1640 void* os::user_handler() {
1641 return CAST_FROM_FN_PTR(void*, UserHandler);
1642 }
1643
1644 extern "C" {
1645 typedef void (*sa_handler_t)(int);
1646 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1647 }
1648
1649 void* os::signal(int signal_number, void* handler) {
1650 struct sigaction sigAct, oldSigAct;
1651
1652 sigfillset(&(sigAct.sa_mask));
1653
1654 // Do not block out synchronous signals in the signal handler.
1655 // Blocking synchronous signals only makes sense if you can really
1656 // be sure that those signals won't happen during signal handling,
1657 // when the blocking applies. Normal signal handlers are lean and
1658 // do not cause signals. But our signal handlers tend to be "risky"
1659 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1660 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1661 // by a SIGILL, which was blocked due to the signal mask. The process
1662 // just hung forever. Better to crash from a secondary signal than to hang.
1663 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1664 sigdelset(&(sigAct.sa_mask), SIGBUS);
1665 sigdelset(&(sigAct.sa_mask), SIGILL);
1666 sigdelset(&(sigAct.sa_mask), SIGFPE);
1667 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1668
1669 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1670
1671 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1672
1673 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1674 // -1 means registration failed
1675 return (void *)-1;
1676 }
1677
1678 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1679 }
1680
1681 void os::signal_raise(int signal_number) {
1682 ::raise(signal_number);
1683 }
1684
1685 //
1686 // The following code is moved from os.cpp for making this
1687 // code platform specific, which it is by its very nature.
1688 //
1689
1690 // Will be modified when max signal is changed to be dynamic
1691 int os::sigexitnum_pd() {
1692 return NSIG;
1693 }
1694
1695 // a counter for each possible signal value
1696 static volatile jint pending_signals[NSIG+1] = { 0 };
1697
1698 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1699 // On AIX, we use sem_init(), sem_post(), sem_wait()
1700 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1701 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1702 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1703 // on AIX, msem_..() calls are suspected of causing problems.
1704 static sem_t sig_sem;
1705 static msemaphore* p_sig_msem = 0;
1706
1707 static void local_sem_init() {
1708 if (os::Aix::on_aix()) {
1709 int rc = ::sem_init(&sig_sem, 0, 0);
1710 guarantee(rc != -1, "sem_init failed");
1711 } else {
1712 // Memory semaphores must live in shared mem.
1713 guarantee0(p_sig_msem == NULL);
1714 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1715 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1716 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1717 }
1718 }
1719
1720 static void local_sem_post() {
1721 static bool warn_only_once = false;
1722 if (os::Aix::on_aix()) {
1723 int rc = ::sem_post(&sig_sem);
1724 if (rc == -1 && !warn_only_once) {
1725 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1726 warn_only_once = true;
1727 }
1728 } else {
1729 guarantee0(p_sig_msem != NULL);
1730 int rc = ::msem_unlock(p_sig_msem, 0);
1731 if (rc == -1 && !warn_only_once) {
1732 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1733 warn_only_once = true;
1734 }
1735 }
1736 }
1737
1738 static void local_sem_wait() {
1739 static bool warn_only_once = false;
1740 if (os::Aix::on_aix()) {
1741 int rc = ::sem_wait(&sig_sem);
1742 if (rc == -1 && !warn_only_once) {
1743 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1744 warn_only_once = true;
1745 }
1746 } else {
1747 guarantee0(p_sig_msem != NULL); // must init before use
1748 int rc = ::msem_lock(p_sig_msem, 0);
1749 if (rc == -1 && !warn_only_once) {
1750 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1751 warn_only_once = true;
1752 }
1753 }
1754 }
1755
1756 void os::signal_init_pd() {
1757 // Initialize signal structures
1758 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1759
1760 // Initialize signal semaphore
1761 local_sem_init();
1762 }
1763
1764 void os::signal_notify(int sig) {
1765 Atomic::inc(&pending_signals[sig]);
1766 local_sem_post();
1767 }
1768
1769 static int check_pending_signals(bool wait) {
1770 Atomic::store(0, &sigint_count);
1771 for (;;) {
1772 for (int i = 0; i < NSIG + 1; i++) {
1773 jint n = pending_signals[i];
1774 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1775 return i;
1776 }
1777 }
1778 if (!wait) {
1779 return -1;
1780 }
1781 JavaThread *thread = JavaThread::current();
1782 ThreadBlockInVM tbivm(thread);
1783
1784 bool threadIsSuspended;
1785 do {
1786 thread->set_suspend_equivalent();
1787 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1788
1789 local_sem_wait();
1790
1791 // were we externally suspended while we were waiting?
1792 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1793 if (threadIsSuspended) {
1794 //
1795 // The semaphore has been incremented, but while we were waiting
1796 // another thread suspended us. We don't want to continue running
1797 // while suspended because that would surprise the thread that
1798 // suspended us.
1799 //
1800
1801 local_sem_post();
1802
1803 thread->java_suspend_self();
1804 }
1805 } while (threadIsSuspended);
1806 }
1807 }
1808
1809 int os::signal_lookup() {
1810 return check_pending_signals(false);
1811 }
1812
1813 int os::signal_wait() {
1814 return check_pending_signals(true);
1815 }
1816
1817 ////////////////////////////////////////////////////////////////////////////////
1818 // Virtual Memory
1819
1820 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1821
1822 #define VMEM_MAPPED 1
1823 #define VMEM_SHMATED 2
1824
1825 struct vmembk_t {
1826 int type; // 1 - mmap, 2 - shmat
1827 char* addr;
1828 size_t size; // Real size, may be larger than usersize.
1829 size_t pagesize; // page size of area
1830 vmembk_t* next;
1831
1832 bool contains_addr(char* p) const {
1833 return p >= addr && p < (addr + size);
1834 }
1835
1836 bool contains_range(char* p, size_t s) const {
1837 return contains_addr(p) && contains_addr(p + s - 1);
1838 }
1839
1840 void print_on(outputStream* os) const {
1841 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1842 " bytes, %d %s pages), %s",
1843 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1844 (type == VMEM_SHMATED ? "shmat" : "mmap")
1845 );
1846 }
1847
1848 // Check that range is a sub range of memory block (or equal to memory block);
1849 // also check that range is fully page aligned to the page size if the block.
1850 void assert_is_valid_subrange(char* p, size_t s) const {
1851 if (!contains_range(p, s)) {
1852 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1853 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1854 p, p + s, addr, addr + size);
1855 guarantee0(false);
1856 }
1857 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1858 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1859 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1860 guarantee0(false);
1861 }
1862 }
1863 };
1864
1865 static struct {
1866 vmembk_t* first;
1867 MiscUtils::CritSect cs;
1868 } vmem;
1869
1870 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1871 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1872 assert0(p);
1873 if (p) {
1874 MiscUtils::AutoCritSect lck(&vmem.cs);
1875 p->addr = addr; p->size = size;
1876 p->pagesize = pagesize;
1877 p->type = type;
1878 p->next = vmem.first;
1879 vmem.first = p;
1880 }
1881 }
1882
1883 static vmembk_t* vmembk_find(char* addr) {
1884 MiscUtils::AutoCritSect lck(&vmem.cs);
1885 for (vmembk_t* p = vmem.first; p; p = p->next) {
1886 if (p->addr <= addr && (p->addr + p->size) > addr) {
1887 return p;
1888 }
1889 }
1890 return NULL;
1891 }
1892
1893 static void vmembk_remove(vmembk_t* p0) {
1894 MiscUtils::AutoCritSect lck(&vmem.cs);
1895 assert0(p0);
1896 assert0(vmem.first); // List should not be empty.
1897 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1898 if (*pp == p0) {
1899 *pp = p0->next;
1900 ::free(p0);
1901 return;
1902 }
1903 }
1904 assert0(false); // Not found?
1905 }
1906
1907 static void vmembk_print_on(outputStream* os) {
1908 MiscUtils::AutoCritSect lck(&vmem.cs);
1909 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1910 vmi->print_on(os);
1911 os->cr();
1912 }
1913 }
1914
1915 // Reserve and attach a section of System V memory.
1916 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1917 // address. Failing that, it will attach the memory anywhere.
1918 // If <requested_addr> is NULL, function will attach the memory anywhere.
1919 //
1920 // <alignment_hint> is being ignored by this function. It is very probable however that the
1921 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1922 // Should this be not enogh, we can put more work into it.
1923 static char* reserve_shmated_memory (
1924 size_t bytes,
1925 char* requested_addr,
1926 size_t alignment_hint) {
1927
1928 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1929 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1930 bytes, requested_addr, alignment_hint);
1931
1932 // Either give me wish address or wish alignment but not both.
1933 assert0(!(requested_addr != NULL && alignment_hint != 0));
1934
1935 // We must prevent anyone from attaching too close to the
1936 // BRK because that may cause malloc OOM.
1937 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1938 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1939 "Will attach anywhere.", requested_addr);
1940 // Act like the OS refused to attach there.
1941 requested_addr = NULL;
1942 }
1943
1944 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1945 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1946 if (os::Aix::on_pase_V5R4_or_older()) {
1947 ShouldNotReachHere();
1948 }
1949
1950 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1951 const size_t size = align_size_up(bytes, SIZE_64K);
1952
1953 // Reserve the shared segment.
1954 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1955 if (shmid == -1) {
1956 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1957 return NULL;
1958 }
1959
1960 // Important note:
1961 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1962 // We must right after attaching it remove it from the system. System V shm segments are global and
1963 // survive the process.
1964 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1965
1966 struct shmid_ds shmbuf;
1967 memset(&shmbuf, 0, sizeof(shmbuf));
1968 shmbuf.shm_pagesize = SIZE_64K;
1969 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1970 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1971 size / SIZE_64K, errno);
1972 // I want to know if this ever happens.
1973 assert(false, "failed to set page size for shmat");
1974 }
1975
1976 // Now attach the shared segment.
1977 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1978 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1979 // were not a segment boundary.
1980 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1981 const int errno_shmat = errno;
1982
1983 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1984 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
1985 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
1986 assert(false, "failed to remove shared memory segment!");
1987 }
1988
1989 // Handle shmat error. If we failed to attach, just return.
1990 if (addr == (char*)-1) {
1991 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
1992 return NULL;
1993 }
1994
1995 // Just for info: query the real page size. In case setting the page size did not
1996 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
1997 const size_t real_pagesize = os::Aix::query_pagesize(addr);
1998 if (real_pagesize != shmbuf.shm_pagesize) {
1999 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2000 }
2001
2002 if (addr) {
2003 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2004 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2005 } else {
2006 if (requested_addr != NULL) {
2007 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2008 } else {
2009 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2010 }
2011 }
2012
2013 // book-keeping
2014 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2015 assert0(is_aligned_to(addr, os::vm_page_size()));
2016
2017 return addr;
2018 }
2019
2020 static bool release_shmated_memory(char* addr, size_t size) {
2021
2022 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2023 addr, addr + size - 1);
2024
2025 bool rc = false;
2026
2027 // TODO: is there a way to verify shm size without doing bookkeeping?
2028 if (::shmdt(addr) != 0) {
2029 trcVerbose("error (%d).", errno);
2030 } else {
2031 trcVerbose("ok.");
2032 rc = true;
2033 }
2034 return rc;
2035 }
2036
2037 static bool uncommit_shmated_memory(char* addr, size_t size) {
2038 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2039 addr, addr + size - 1);
2040
2041 const bool rc = my_disclaim64(addr, size);
2042
2043 if (!rc) {
2044 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2045 return false;
2046 }
2047 return true;
2048 }
2049
2050 //////////////////////////////// mmap-based routines /////////////////////////////////
2051
2052 // Reserve memory via mmap.
2053 // If <requested_addr> is given, an attempt is made to attach at the given address.
2054 // Failing that, memory is allocated at any address.
2055 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2056 // allocate at an address aligned with the given alignment. Failing that, memory
2057 // is aligned anywhere.
2058 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2059 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2060 "alignment_hint " UINTX_FORMAT "...",
2061 bytes, requested_addr, alignment_hint);
2062
2063 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2064 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2065 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2066 return NULL;
2067 }
2068
2069 // We must prevent anyone from attaching too close to the
2070 // BRK because that may cause malloc OOM.
2071 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2072 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2073 "Will attach anywhere.", requested_addr);
2074 // Act like the OS refused to attach there.
2075 requested_addr = NULL;
2076 }
2077
2078 // Specify one or the other but not both.
2079 assert0(!(requested_addr != NULL && alignment_hint > 0));
2080
2081 // In 64K mode, we claim the global page size (os::vm_page_size())
2082 // is 64K. This is one of the few points where that illusion may
2083 // break, because mmap() will always return memory aligned to 4K. So
2084 // we must ensure we only ever return memory aligned to 64k.
2085 if (alignment_hint) {
2086 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2087 } else {
2088 alignment_hint = os::vm_page_size();
2089 }
2090
2091 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2092 const size_t size = align_size_up(bytes, os::vm_page_size());
2093
2094 // alignment: Allocate memory large enough to include an aligned range of the right size and
2095 // cut off the leading and trailing waste pages.
2096 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2097 const size_t extra_size = size + alignment_hint;
2098
2099 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2100 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2101 int flags = MAP_ANONYMOUS | MAP_SHARED;
2102
2103 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2104 // it means if wishaddress is given but MAP_FIXED is not set.
2105 //
2106 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2107 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2108 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2109 // get clobbered.
2110 if (requested_addr != NULL) {
2111 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2112 flags |= MAP_FIXED;
2113 }
2114 }
2115
2116 char* addr = (char*)::mmap(requested_addr, extra_size,
2117 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2118
2119 if (addr == MAP_FAILED) {
2120 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2121 return NULL;
2122 }
2123
2124 // Handle alignment.
2125 char* const addr_aligned = (char *)align_ptr_up(addr, alignment_hint);
2126 const size_t waste_pre = addr_aligned - addr;
2127 char* const addr_aligned_end = addr_aligned + size;
2128 const size_t waste_post = extra_size - waste_pre - size;
2129 if (waste_pre > 0) {
2130 ::munmap(addr, waste_pre);
2131 }
2132 if (waste_post > 0) {
2133 ::munmap(addr_aligned_end, waste_post);
2134 }
2135 addr = addr_aligned;
2136
2137 if (addr) {
2138 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2139 addr, addr + bytes, bytes);
2140 } else {
2141 if (requested_addr != NULL) {
2142 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2143 } else {
2144 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2145 }
2146 }
2147
2148 // bookkeeping
2149 vmembk_add(addr, size, SIZE_4K, VMEM_MAPPED);
2150
2151 // Test alignment, see above.
2152 assert0(is_aligned_to(addr, os::vm_page_size()));
2153
2154 return addr;
2155 }
2156
2157 static bool release_mmaped_memory(char* addr, size_t size) {
2158 assert0(is_aligned_to(addr, os::vm_page_size()));
2159 assert0(is_aligned_to(size, os::vm_page_size()));
2160
2161 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2162 addr, addr + size - 1);
2163 bool rc = false;
2164
2165 if (::munmap(addr, size) != 0) {
2166 trcVerbose("failed (%d)\n", errno);
2167 rc = false;
2168 } else {
2169 trcVerbose("ok.");
2170 rc = true;
2171 }
2172
2173 return rc;
2174 }
2175
2176 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2177
2178 assert0(is_aligned_to(addr, os::vm_page_size()));
2179 assert0(is_aligned_to(size, os::vm_page_size()));
2180
2181 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2182 addr, addr + size - 1);
2183 bool rc = false;
2184
2185 // Uncommit mmap memory with msync MS_INVALIDATE.
2186 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2187 trcVerbose("failed (%d)\n", errno);
2188 rc = false;
2189 } else {
2190 trcVerbose("ok.");
2191 rc = true;
2192 }
2193
2194 return rc;
2195 }
2196
2197 int os::vm_page_size() {
2198 // Seems redundant as all get out.
2199 assert(os::Aix::page_size() != -1, "must call os::init");
2200 return os::Aix::page_size();
2201 }
2202
2203 // Aix allocates memory by pages.
2204 int os::vm_allocation_granularity() {
2205 assert(os::Aix::page_size() != -1, "must call os::init");
2206 return os::Aix::page_size();
2207 }
2208
2209 #ifdef PRODUCT
2210 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2211 int err) {
2212 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2213 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2214 os::errno_name(err), err);
2215 }
2216 #endif
2217
2218 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2219 const char* mesg) {
2220 assert(mesg != NULL, "mesg must be specified");
2221 if (!pd_commit_memory(addr, size, exec)) {
2222 // Add extra info in product mode for vm_exit_out_of_memory():
2223 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2224 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2225 }
2226 }
2227
2228 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2229
2230 assert(is_aligned_to(addr, os::vm_page_size()),
2231 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2232 p2i(addr), os::vm_page_size());
2233 assert(is_aligned_to(size, os::vm_page_size()),
2234 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2235 size, os::vm_page_size());
2236
2237 vmembk_t* const vmi = vmembk_find(addr);
2238 guarantee0(vmi);
2239 vmi->assert_is_valid_subrange(addr, size);
2240
2241 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2242
2243 if (UseExplicitCommit) {
2244 // AIX commits memory on touch. So, touch all pages to be committed.
2245 for (char* p = addr; p < (addr + size); p += SIZE_4K) {
2246 *p = '\0';
2247 }
2248 }
2249
2250 return true;
2251 }
2252
2253 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2254 return pd_commit_memory(addr, size, exec);
2255 }
2256
2257 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2258 size_t alignment_hint, bool exec,
2259 const char* mesg) {
2260 // Alignment_hint is ignored on this OS.
2261 pd_commit_memory_or_exit(addr, size, exec, mesg);
2262 }
2263
2264 bool os::pd_uncommit_memory(char* addr, size_t size) {
2265 assert(is_aligned_to(addr, os::vm_page_size()),
2266 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2267 p2i(addr), os::vm_page_size());
2268 assert(is_aligned_to(size, os::vm_page_size()),
2269 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2270 size, os::vm_page_size());
2271
2272 // Dynamically do different things for mmap/shmat.
2273 const vmembk_t* const vmi = vmembk_find(addr);
2274 guarantee0(vmi);
2275 vmi->assert_is_valid_subrange(addr, size);
2276
2277 if (vmi->type == VMEM_SHMATED) {
2278 return uncommit_shmated_memory(addr, size);
2279 } else {
2280 return uncommit_mmaped_memory(addr, size);
2281 }
2282 }
2283
2284 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2285 // Do not call this; no need to commit stack pages on AIX.
2286 ShouldNotReachHere();
2287 return true;
2288 }
2289
2290 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2291 // Do not call this; no need to commit stack pages on AIX.
2292 ShouldNotReachHere();
2293 return true;
2294 }
2295
2296 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2297 }
2298
2299 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2300 }
2301
2302 void os::numa_make_global(char *addr, size_t bytes) {
2303 }
2304
2305 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2306 }
2307
2308 bool os::numa_topology_changed() {
2309 return false;
2310 }
2311
2312 size_t os::numa_get_groups_num() {
2313 return 1;
2314 }
2315
2316 int os::numa_get_group_id() {
2317 return 0;
2318 }
2319
2320 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2321 if (size > 0) {
2322 ids[0] = 0;
2323 return 1;
2324 }
2325 return 0;
2326 }
2327
2328 bool os::get_page_info(char *start, page_info* info) {
2329 return false;
2330 }
2331
2332 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2333 return end;
2334 }
2335
2336 // Reserves and attaches a shared memory segment.
2337 // Will assert if a wish address is given and could not be obtained.
2338 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2339
2340 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2341 // thereby clobbering old mappings at that place. That is probably
2342 // not intended, never used and almost certainly an error were it
2343 // ever be used this way (to try attaching at a specified address
2344 // without clobbering old mappings an alternate API exists,
2345 // os::attempt_reserve_memory_at()).
2346 // Instead of mimicking the dangerous coding of the other platforms, here I
2347 // just ignore the request address (release) or assert(debug).
2348 assert0(requested_addr == NULL);
2349
2350 // Always round to os::vm_page_size(), which may be larger than 4K.
2351 bytes = align_size_up(bytes, os::vm_page_size());
2352 const size_t alignment_hint0 =
2353 alignment_hint ? align_size_up(alignment_hint, os::vm_page_size()) : 0;
2354
2355 // In 4K mode always use mmap.
2356 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2357 if (os::vm_page_size() == SIZE_4K) {
2358 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2359 } else {
2360 if (bytes >= Use64KPagesThreshold) {
2361 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2362 } else {
2363 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2364 }
2365 }
2366 }
2367
2368 bool os::pd_release_memory(char* addr, size_t size) {
2369
2370 // Dynamically do different things for mmap/shmat.
2371 vmembk_t* const vmi = vmembk_find(addr);
2372 guarantee0(vmi);
2373
2374 // Always round to os::vm_page_size(), which may be larger than 4K.
2375 size = align_size_up(size, os::vm_page_size());
2376 addr = (char *)align_ptr_up(addr, os::vm_page_size());
2377
2378 bool rc = false;
2379 bool remove_bookkeeping = false;
2380 if (vmi->type == VMEM_SHMATED) {
2381 // For shmatted memory, we do:
2382 // - If user wants to release the whole range, release the memory (shmdt).
2383 // - If user only wants to release a partial range, uncommit (disclaim) that
2384 // range. That way, at least, we do not use memory anymore (bust still page
2385 // table space).
2386 vmi->assert_is_valid_subrange(addr, size);
2387 if (addr == vmi->addr && size == vmi->size) {
2388 rc = release_shmated_memory(addr, size);
2389 remove_bookkeeping = true;
2390 } else {
2391 rc = uncommit_shmated_memory(addr, size);
2392 }
2393 } else {
2394 // User may unmap partial regions but region has to be fully contained.
2395 #ifdef ASSERT
2396 vmi->assert_is_valid_subrange(addr, size);
2397 #endif
2398 rc = release_mmaped_memory(addr, size);
2399 remove_bookkeeping = true;
2400 }
2401
2402 // update bookkeeping
2403 if (rc && remove_bookkeeping) {
2404 vmembk_remove(vmi);
2405 }
2406
2407 return rc;
2408 }
2409
2410 static bool checked_mprotect(char* addr, size_t size, int prot) {
2411
2412 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2413 // not tell me if protection failed when trying to protect an un-protectable range.
2414 //
2415 // This means if the memory was allocated using shmget/shmat, protection wont work
2416 // but mprotect will still return 0:
2417 //
2418 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2419
2420 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2421
2422 if (!rc) {
2423 const char* const s_errno = os::errno_name(errno);
2424 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2425 return false;
2426 }
2427
2428 // mprotect success check
2429 //
2430 // Mprotect said it changed the protection but can I believe it?
2431 //
2432 // To be sure I need to check the protection afterwards. Try to
2433 // read from protected memory and check whether that causes a segfault.
2434 //
2435 if (!os::Aix::xpg_sus_mode()) {
2436
2437 if (CanUseSafeFetch32()) {
2438
2439 const bool read_protected =
2440 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2441 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2442
2443 if (prot & PROT_READ) {
2444 rc = !read_protected;
2445 } else {
2446 rc = read_protected;
2447 }
2448
2449 if (!rc) {
2450 if (os::Aix::on_pase()) {
2451 // There is an issue on older PASE systems where mprotect() will return success but the
2452 // memory will not be protected.
2453 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2454 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2455 // a stack. It is an OS error.
2456 //
2457 // A valid strategy is just to try again. This usually works. :-/
2458
2459 ::usleep(1000);
2460 if (::mprotect(addr, size, prot) == 0) {
2461 const bool read_protected_2 =
2462 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2463 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2464 rc = true;
2465 }
2466 }
2467 }
2468 }
2469 }
2470
2471 assert(rc == true, "mprotect failed.");
2472
2473 return rc;
2474 }
2475
2476 // Set protections specified
2477 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2478 unsigned int p = 0;
2479 switch (prot) {
2480 case MEM_PROT_NONE: p = PROT_NONE; break;
2481 case MEM_PROT_READ: p = PROT_READ; break;
2482 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2483 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2484 default:
2485 ShouldNotReachHere();
2486 }
2487 // is_committed is unused.
2488 return checked_mprotect(addr, size, p);
2489 }
2490
2491 bool os::guard_memory(char* addr, size_t size) {
2492 return checked_mprotect(addr, size, PROT_NONE);
2493 }
2494
2495 bool os::unguard_memory(char* addr, size_t size) {
2496 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2497 }
2498
2499 // Large page support
2500
2501 static size_t _large_page_size = 0;
2502
2503 // Enable large page support if OS allows that.
2504 void os::large_page_init() {
2505 return; // Nothing to do. See query_multipage_support and friends.
2506 }
2507
2508 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2509 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2510 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2511 // so this is not needed.
2512 assert(false, "should not be called on AIX");
2513 return NULL;
2514 }
2515
2516 bool os::release_memory_special(char* base, size_t bytes) {
2517 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2518 Unimplemented();
2519 return false;
2520 }
2521
2522 size_t os::large_page_size() {
2523 return _large_page_size;
2524 }
2525
2526 bool os::can_commit_large_page_memory() {
2527 // Does not matter, we do not support huge pages.
2528 return false;
2529 }
2530
2531 bool os::can_execute_large_page_memory() {
2532 // Does not matter, we do not support huge pages.
2533 return false;
2534 }
2535
2536 // Reserve memory at an arbitrary address, only if that area is
2537 // available (and not reserved for something else).
2538 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2539 char* addr = NULL;
2540
2541 // Always round to os::vm_page_size(), which may be larger than 4K.
2542 bytes = align_size_up(bytes, os::vm_page_size());
2543
2544 // In 4K mode always use mmap.
2545 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2546 if (os::vm_page_size() == SIZE_4K) {
2547 return reserve_mmaped_memory(bytes, requested_addr, 0);
2548 } else {
2549 if (bytes >= Use64KPagesThreshold) {
2550 return reserve_shmated_memory(bytes, requested_addr, 0);
2551 } else {
2552 return reserve_mmaped_memory(bytes, requested_addr, 0);
2553 }
2554 }
2555
2556 return addr;
2557 }
2558
2559 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2560 return ::read(fd, buf, nBytes);
2561 }
2562
2563 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2564 return ::pread(fd, buf, nBytes, offset);
2565 }
2566
2567 void os::naked_short_sleep(jlong ms) {
2568 struct timespec req;
2569
2570 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2571 req.tv_sec = 0;
2572 if (ms > 0) {
2573 req.tv_nsec = (ms % 1000) * 1000000;
2574 }
2575 else {
2576 req.tv_nsec = 1;
2577 }
2578
2579 nanosleep(&req, NULL);
2580
2581 return;
2582 }
2583
2584 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2585 void os::infinite_sleep() {
2586 while (true) { // sleep forever ...
2587 ::sleep(100); // ... 100 seconds at a time
2588 }
2589 }
2590
2591 // Used to convert frequent JVM_Yield() to nops
2592 bool os::dont_yield() {
2593 return DontYieldALot;
2594 }
2595
2596 void os::naked_yield() {
2597 sched_yield();
2598 }
2599
2600 ////////////////////////////////////////////////////////////////////////////////
2601 // thread priority support
2602
2603 // From AIX manpage to pthread_setschedparam
2604 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2605 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2606 //
2607 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2608 // range from 40 to 80, where 40 is the least favored priority and 80
2609 // is the most favored."
2610 //
2611 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2612 // scheduling there; however, this still leaves iSeries.)
2613 //
2614 // We use the same values for AIX and PASE.
2615 int os::java_to_os_priority[CriticalPriority + 1] = {
2616 54, // 0 Entry should never be used
2617
2618 55, // 1 MinPriority
2619 55, // 2
2620 56, // 3
2621
2622 56, // 4
2623 57, // 5 NormPriority
2624 57, // 6
2625
2626 58, // 7
2627 58, // 8
2628 59, // 9 NearMaxPriority
2629
2630 60, // 10 MaxPriority
2631
2632 60 // 11 CriticalPriority
2633 };
2634
2635 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2636 if (!UseThreadPriorities) return OS_OK;
2637 pthread_t thr = thread->osthread()->pthread_id();
2638 int policy = SCHED_OTHER;
2639 struct sched_param param;
2640 param.sched_priority = newpri;
2641 int ret = pthread_setschedparam(thr, policy, ¶m);
2642
2643 if (ret != 0) {
2644 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2645 (int)thr, newpri, ret, os::errno_name(ret));
2646 }
2647 return (ret == 0) ? OS_OK : OS_ERR;
2648 }
2649
2650 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2651 if (!UseThreadPriorities) {
2652 *priority_ptr = java_to_os_priority[NormPriority];
2653 return OS_OK;
2654 }
2655 pthread_t thr = thread->osthread()->pthread_id();
2656 int policy = SCHED_OTHER;
2657 struct sched_param param;
2658 int ret = pthread_getschedparam(thr, &policy, ¶m);
2659 *priority_ptr = param.sched_priority;
2660
2661 return (ret == 0) ? OS_OK : OS_ERR;
2662 }
2663
2664 // Hint to the underlying OS that a task switch would not be good.
2665 // Void return because it's a hint and can fail.
2666 void os::hint_no_preempt() {}
2667
2668 ////////////////////////////////////////////////////////////////////////////////
2669 // suspend/resume support
2670
2671 // the low-level signal-based suspend/resume support is a remnant from the
2672 // old VM-suspension that used to be for java-suspension, safepoints etc,
2673 // within hotspot. Now there is a single use-case for this:
2674 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2675 // that runs in the watcher thread.
2676 // The remaining code is greatly simplified from the more general suspension
2677 // code that used to be used.
2678 //
2679 // The protocol is quite simple:
2680 // - suspend:
2681 // - sends a signal to the target thread
2682 // - polls the suspend state of the osthread using a yield loop
2683 // - target thread signal handler (SR_handler) sets suspend state
2684 // and blocks in sigsuspend until continued
2685 // - resume:
2686 // - sets target osthread state to continue
2687 // - sends signal to end the sigsuspend loop in the SR_handler
2688 //
2689 // Note that the SR_lock plays no role in this suspend/resume protocol.
2690 //
2691
2692 static void resume_clear_context(OSThread *osthread) {
2693 osthread->set_ucontext(NULL);
2694 osthread->set_siginfo(NULL);
2695 }
2696
2697 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2698 osthread->set_ucontext(context);
2699 osthread->set_siginfo(siginfo);
2700 }
2701
2702 //
2703 // Handler function invoked when a thread's execution is suspended or
2704 // resumed. We have to be careful that only async-safe functions are
2705 // called here (Note: most pthread functions are not async safe and
2706 // should be avoided.)
2707 //
2708 // Note: sigwait() is a more natural fit than sigsuspend() from an
2709 // interface point of view, but sigwait() prevents the signal hander
2710 // from being run. libpthread would get very confused by not having
2711 // its signal handlers run and prevents sigwait()'s use with the
2712 // mutex granting granting signal.
2713 //
2714 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2715 //
2716 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2717 // Save and restore errno to avoid confusing native code with EINTR
2718 // after sigsuspend.
2719 int old_errno = errno;
2720
2721 Thread* thread = Thread::current();
2722 OSThread* osthread = thread->osthread();
2723 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2724
2725 os::SuspendResume::State current = osthread->sr.state();
2726 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2727 suspend_save_context(osthread, siginfo, context);
2728
2729 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2730 os::SuspendResume::State state = osthread->sr.suspended();
2731 if (state == os::SuspendResume::SR_SUSPENDED) {
2732 sigset_t suspend_set; // signals for sigsuspend()
2733
2734 // get current set of blocked signals and unblock resume signal
2735 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2736 sigdelset(&suspend_set, SR_signum);
2737
2738 // wait here until we are resumed
2739 while (1) {
2740 sigsuspend(&suspend_set);
2741
2742 os::SuspendResume::State result = osthread->sr.running();
2743 if (result == os::SuspendResume::SR_RUNNING) {
2744 break;
2745 }
2746 }
2747
2748 } else if (state == os::SuspendResume::SR_RUNNING) {
2749 // request was cancelled, continue
2750 } else {
2751 ShouldNotReachHere();
2752 }
2753
2754 resume_clear_context(osthread);
2755 } else if (current == os::SuspendResume::SR_RUNNING) {
2756 // request was cancelled, continue
2757 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2758 // ignore
2759 } else {
2760 ShouldNotReachHere();
2761 }
2762
2763 errno = old_errno;
2764 }
2765
2766 static int SR_initialize() {
2767 struct sigaction act;
2768 char *s;
2769 // Get signal number to use for suspend/resume
2770 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2771 int sig = ::strtol(s, 0, 10);
2772 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2773 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2774 SR_signum = sig;
2775 } else {
2776 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2777 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2778 }
2779 }
2780
2781 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2782 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2783
2784 sigemptyset(&SR_sigset);
2785 sigaddset(&SR_sigset, SR_signum);
2786
2787 // Set up signal handler for suspend/resume.
2788 act.sa_flags = SA_RESTART|SA_SIGINFO;
2789 act.sa_handler = (void (*)(int)) SR_handler;
2790
2791 // SR_signum is blocked by default.
2792 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2793
2794 if (sigaction(SR_signum, &act, 0) == -1) {
2795 return -1;
2796 }
2797
2798 // Save signal flag
2799 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2800 return 0;
2801 }
2802
2803 static int SR_finalize() {
2804 return 0;
2805 }
2806
2807 static int sr_notify(OSThread* osthread) {
2808 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2809 assert_status(status == 0, status, "pthread_kill");
2810 return status;
2811 }
2812
2813 // "Randomly" selected value for how long we want to spin
2814 // before bailing out on suspending a thread, also how often
2815 // we send a signal to a thread we want to resume
2816 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2817 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2818
2819 // returns true on success and false on error - really an error is fatal
2820 // but this seems the normal response to library errors
2821 static bool do_suspend(OSThread* osthread) {
2822 assert(osthread->sr.is_running(), "thread should be running");
2823 // mark as suspended and send signal
2824
2825 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2826 // failed to switch, state wasn't running?
2827 ShouldNotReachHere();
2828 return false;
2829 }
2830
2831 if (sr_notify(osthread) != 0) {
2832 // try to cancel, switch to running
2833
2834 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2835 if (result == os::SuspendResume::SR_RUNNING) {
2836 // cancelled
2837 return false;
2838 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2839 // somehow managed to suspend
2840 return true;
2841 } else {
2842 ShouldNotReachHere();
2843 return false;
2844 }
2845 }
2846
2847 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2848
2849 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2850 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2851 os::naked_yield();
2852 }
2853
2854 // timeout, try to cancel the request
2855 if (n >= RANDOMLY_LARGE_INTEGER) {
2856 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2857 if (cancelled == os::SuspendResume::SR_RUNNING) {
2858 return false;
2859 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2860 return true;
2861 } else {
2862 ShouldNotReachHere();
2863 return false;
2864 }
2865 }
2866 }
2867
2868 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2869 return true;
2870 }
2871
2872 static void do_resume(OSThread* osthread) {
2873 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2874
2875 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2876 // failed to switch to WAKEUP_REQUEST
2877 ShouldNotReachHere();
2878 return;
2879 }
2880
2881 while (!osthread->sr.is_running()) {
2882 if (sr_notify(osthread) == 0) {
2883 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2884 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2885 os::naked_yield();
2886 }
2887 }
2888 } else {
2889 ShouldNotReachHere();
2890 }
2891 }
2892
2893 guarantee(osthread->sr.is_running(), "Must be running!");
2894 }
2895
2896 ///////////////////////////////////////////////////////////////////////////////////
2897 // signal handling (except suspend/resume)
2898
2899 // This routine may be used by user applications as a "hook" to catch signals.
2900 // The user-defined signal handler must pass unrecognized signals to this
2901 // routine, and if it returns true (non-zero), then the signal handler must
2902 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2903 // routine will never retun false (zero), but instead will execute a VM panic
2904 // routine kill the process.
2905 //
2906 // If this routine returns false, it is OK to call it again. This allows
2907 // the user-defined signal handler to perform checks either before or after
2908 // the VM performs its own checks. Naturally, the user code would be making
2909 // a serious error if it tried to handle an exception (such as a null check
2910 // or breakpoint) that the VM was generating for its own correct operation.
2911 //
2912 // This routine may recognize any of the following kinds of signals:
2913 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2914 // It should be consulted by handlers for any of those signals.
2915 //
2916 // The caller of this routine must pass in the three arguments supplied
2917 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2918 // field of the structure passed to sigaction(). This routine assumes that
2919 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2920 //
2921 // Note that the VM will print warnings if it detects conflicting signal
2922 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2923 //
2924 extern "C" JNIEXPORT int
2925 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2926
2927 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2928 // to be the thing to call; documentation is not terribly clear about whether
2929 // pthread_sigmask also works, and if it does, whether it does the same.
2930 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2931 const int rc = ::pthread_sigmask(how, set, oset);
2932 // return value semantics differ slightly for error case:
2933 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2934 // (so, pthread_sigmask is more theadsafe for error handling)
2935 // But success is always 0.
2936 return rc == 0 ? true : false;
2937 }
2938
2939 // Function to unblock all signals which are, according
2940 // to POSIX, typical program error signals. If they happen while being blocked,
2941 // they typically will bring down the process immediately.
2942 bool unblock_program_error_signals() {
2943 sigset_t set;
2944 ::sigemptyset(&set);
2945 ::sigaddset(&set, SIGILL);
2946 ::sigaddset(&set, SIGBUS);
2947 ::sigaddset(&set, SIGFPE);
2948 ::sigaddset(&set, SIGSEGV);
2949 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2950 }
2951
2952 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2953 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2954 assert(info != NULL && uc != NULL, "it must be old kernel");
2955
2956 // Never leave program error signals blocked;
2957 // on all our platforms they would bring down the process immediately when
2958 // getting raised while being blocked.
2959 unblock_program_error_signals();
2960
2961 int orig_errno = errno; // Preserve errno value over signal handler.
2962 JVM_handle_aix_signal(sig, info, uc, true);
2963 errno = orig_errno;
2964 }
2965
2966 // This boolean allows users to forward their own non-matching signals
2967 // to JVM_handle_aix_signal, harmlessly.
2968 bool os::Aix::signal_handlers_are_installed = false;
2969
2970 // For signal-chaining
2971 struct sigaction sigact[NSIG];
2972 sigset_t sigs;
2973 bool os::Aix::libjsig_is_loaded = false;
2974 typedef struct sigaction *(*get_signal_t)(int);
2975 get_signal_t os::Aix::get_signal_action = NULL;
2976
2977 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
2978 struct sigaction *actp = NULL;
2979
2980 if (libjsig_is_loaded) {
2981 // Retrieve the old signal handler from libjsig
2982 actp = (*get_signal_action)(sig);
2983 }
2984 if (actp == NULL) {
2985 // Retrieve the preinstalled signal handler from jvm
2986 actp = get_preinstalled_handler(sig);
2987 }
2988
2989 return actp;
2990 }
2991
2992 static bool call_chained_handler(struct sigaction *actp, int sig,
2993 siginfo_t *siginfo, void *context) {
2994 // Call the old signal handler
2995 if (actp->sa_handler == SIG_DFL) {
2996 // It's more reasonable to let jvm treat it as an unexpected exception
2997 // instead of taking the default action.
2998 return false;
2999 } else if (actp->sa_handler != SIG_IGN) {
3000 if ((actp->sa_flags & SA_NODEFER) == 0) {
3001 // automaticlly block the signal
3002 sigaddset(&(actp->sa_mask), sig);
3003 }
3004
3005 sa_handler_t hand = NULL;
3006 sa_sigaction_t sa = NULL;
3007 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3008 // retrieve the chained handler
3009 if (siginfo_flag_set) {
3010 sa = actp->sa_sigaction;
3011 } else {
3012 hand = actp->sa_handler;
3013 }
3014
3015 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3016 actp->sa_handler = SIG_DFL;
3017 }
3018
3019 // try to honor the signal mask
3020 sigset_t oset;
3021 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3022
3023 // call into the chained handler
3024 if (siginfo_flag_set) {
3025 (*sa)(sig, siginfo, context);
3026 } else {
3027 (*hand)(sig);
3028 }
3029
3030 // restore the signal mask
3031 pthread_sigmask(SIG_SETMASK, &oset, 0);
3032 }
3033 // Tell jvm's signal handler the signal is taken care of.
3034 return true;
3035 }
3036
3037 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3038 bool chained = false;
3039 // signal-chaining
3040 if (UseSignalChaining) {
3041 struct sigaction *actp = get_chained_signal_action(sig);
3042 if (actp != NULL) {
3043 chained = call_chained_handler(actp, sig, siginfo, context);
3044 }
3045 }
3046 return chained;
3047 }
3048
3049 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3050 if (sigismember(&sigs, sig)) {
3051 return &sigact[sig];
3052 }
3053 return NULL;
3054 }
3055
3056 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3057 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3058 sigact[sig] = oldAct;
3059 sigaddset(&sigs, sig);
3060 }
3061
3062 // for diagnostic
3063 int sigflags[NSIG];
3064
3065 int os::Aix::get_our_sigflags(int sig) {
3066 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3067 return sigflags[sig];
3068 }
3069
3070 void os::Aix::set_our_sigflags(int sig, int flags) {
3071 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3072 if (sig > 0 && sig < NSIG) {
3073 sigflags[sig] = flags;
3074 }
3075 }
3076
3077 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3078 // Check for overwrite.
3079 struct sigaction oldAct;
3080 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3081
3082 void* oldhand = oldAct.sa_sigaction
3083 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3084 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3085 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3086 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3087 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3088 if (AllowUserSignalHandlers || !set_installed) {
3089 // Do not overwrite; user takes responsibility to forward to us.
3090 return;
3091 } else if (UseSignalChaining) {
3092 // save the old handler in jvm
3093 save_preinstalled_handler(sig, oldAct);
3094 // libjsig also interposes the sigaction() call below and saves the
3095 // old sigaction on it own.
3096 } else {
3097 fatal("Encountered unexpected pre-existing sigaction handler "
3098 "%#lx for signal %d.", (long)oldhand, sig);
3099 }
3100 }
3101
3102 struct sigaction sigAct;
3103 sigfillset(&(sigAct.sa_mask));
3104 if (!set_installed) {
3105 sigAct.sa_handler = SIG_DFL;
3106 sigAct.sa_flags = SA_RESTART;
3107 } else {
3108 sigAct.sa_sigaction = javaSignalHandler;
3109 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3110 }
3111 // Save flags, which are set by ours
3112 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3113 sigflags[sig] = sigAct.sa_flags;
3114
3115 int ret = sigaction(sig, &sigAct, &oldAct);
3116 assert(ret == 0, "check");
3117
3118 void* oldhand2 = oldAct.sa_sigaction
3119 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3120 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3121 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3122 }
3123
3124 // install signal handlers for signals that HotSpot needs to
3125 // handle in order to support Java-level exception handling.
3126 void os::Aix::install_signal_handlers() {
3127 if (!signal_handlers_are_installed) {
3128 signal_handlers_are_installed = true;
3129
3130 // signal-chaining
3131 typedef void (*signal_setting_t)();
3132 signal_setting_t begin_signal_setting = NULL;
3133 signal_setting_t end_signal_setting = NULL;
3134 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3135 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3136 if (begin_signal_setting != NULL) {
3137 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3138 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3139 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3140 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3141 libjsig_is_loaded = true;
3142 assert(UseSignalChaining, "should enable signal-chaining");
3143 }
3144 if (libjsig_is_loaded) {
3145 // Tell libjsig jvm is setting signal handlers.
3146 (*begin_signal_setting)();
3147 }
3148
3149 ::sigemptyset(&sigs);
3150 set_signal_handler(SIGSEGV, true);
3151 set_signal_handler(SIGPIPE, true);
3152 set_signal_handler(SIGBUS, true);
3153 set_signal_handler(SIGILL, true);
3154 set_signal_handler(SIGFPE, true);
3155 set_signal_handler(SIGTRAP, true);
3156 set_signal_handler(SIGXFSZ, true);
3157 set_signal_handler(SIGDANGER, true);
3158
3159 if (libjsig_is_loaded) {
3160 // Tell libjsig jvm finishes setting signal handlers.
3161 (*end_signal_setting)();
3162 }
3163
3164 // We don't activate signal checker if libjsig is in place, we trust ourselves
3165 // and if UserSignalHandler is installed all bets are off.
3166 // Log that signal checking is off only if -verbose:jni is specified.
3167 if (CheckJNICalls) {
3168 if (libjsig_is_loaded) {
3169 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3170 check_signals = false;
3171 }
3172 if (AllowUserSignalHandlers) {
3173 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3174 check_signals = false;
3175 }
3176 // Need to initialize check_signal_done.
3177 ::sigemptyset(&check_signal_done);
3178 }
3179 }
3180 }
3181
3182 static const char* get_signal_handler_name(address handler,
3183 char* buf, int buflen) {
3184 int offset;
3185 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3186 if (found) {
3187 // skip directory names
3188 const char *p1, *p2;
3189 p1 = buf;
3190 size_t len = strlen(os::file_separator());
3191 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3192 // The way os::dll_address_to_library_name is implemented on Aix
3193 // right now, it always returns -1 for the offset which is not
3194 // terribly informative.
3195 // Will fix that. For now, omit the offset.
3196 jio_snprintf(buf, buflen, "%s", p1);
3197 } else {
3198 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3199 }
3200 return buf;
3201 }
3202
3203 static void print_signal_handler(outputStream* st, int sig,
3204 char* buf, size_t buflen) {
3205 struct sigaction sa;
3206 sigaction(sig, NULL, &sa);
3207
3208 st->print("%s: ", os::exception_name(sig, buf, buflen));
3209
3210 address handler = (sa.sa_flags & SA_SIGINFO)
3211 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3212 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3213
3214 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3215 st->print("SIG_DFL");
3216 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3217 st->print("SIG_IGN");
3218 } else {
3219 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3220 }
3221
3222 // Print readable mask.
3223 st->print(", sa_mask[0]=");
3224 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3225
3226 address rh = VMError::get_resetted_sighandler(sig);
3227 // May be, handler was resetted by VMError?
3228 if (rh != NULL) {
3229 handler = rh;
3230 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3231 }
3232
3233 // Print textual representation of sa_flags.
3234 st->print(", sa_flags=");
3235 os::Posix::print_sa_flags(st, sa.sa_flags);
3236
3237 // Check: is it our handler?
3238 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3239 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3240 // It is our signal handler.
3241 // Check for flags, reset system-used one!
3242 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3243 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3244 os::Aix::get_our_sigflags(sig));
3245 }
3246 }
3247 st->cr();
3248 }
3249
3250 #define DO_SIGNAL_CHECK(sig) \
3251 if (!sigismember(&check_signal_done, sig)) \
3252 os::Aix::check_signal_handler(sig)
3253
3254 // This method is a periodic task to check for misbehaving JNI applications
3255 // under CheckJNI, we can add any periodic checks here
3256
3257 void os::run_periodic_checks() {
3258
3259 if (check_signals == false) return;
3260
3261 // SEGV and BUS if overridden could potentially prevent
3262 // generation of hs*.log in the event of a crash, debugging
3263 // such a case can be very challenging, so we absolutely
3264 // check the following for a good measure:
3265 DO_SIGNAL_CHECK(SIGSEGV);
3266 DO_SIGNAL_CHECK(SIGILL);
3267 DO_SIGNAL_CHECK(SIGFPE);
3268 DO_SIGNAL_CHECK(SIGBUS);
3269 DO_SIGNAL_CHECK(SIGPIPE);
3270 DO_SIGNAL_CHECK(SIGXFSZ);
3271 if (UseSIGTRAP) {
3272 DO_SIGNAL_CHECK(SIGTRAP);
3273 }
3274 DO_SIGNAL_CHECK(SIGDANGER);
3275
3276 // ReduceSignalUsage allows the user to override these handlers
3277 // see comments at the very top and jvm_solaris.h
3278 if (!ReduceSignalUsage) {
3279 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3280 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3281 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3282 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3283 }
3284
3285 DO_SIGNAL_CHECK(SR_signum);
3286 }
3287
3288 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3289
3290 static os_sigaction_t os_sigaction = NULL;
3291
3292 void os::Aix::check_signal_handler(int sig) {
3293 char buf[O_BUFLEN];
3294 address jvmHandler = NULL;
3295
3296 struct sigaction act;
3297 if (os_sigaction == NULL) {
3298 // only trust the default sigaction, in case it has been interposed
3299 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3300 if (os_sigaction == NULL) return;
3301 }
3302
3303 os_sigaction(sig, (struct sigaction*)NULL, &act);
3304
3305 address thisHandler = (act.sa_flags & SA_SIGINFO)
3306 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3307 : CAST_FROM_FN_PTR(address, act.sa_handler);
3308
3309 switch(sig) {
3310 case SIGSEGV:
3311 case SIGBUS:
3312 case SIGFPE:
3313 case SIGPIPE:
3314 case SIGILL:
3315 case SIGXFSZ:
3316 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3317 break;
3318
3319 case SHUTDOWN1_SIGNAL:
3320 case SHUTDOWN2_SIGNAL:
3321 case SHUTDOWN3_SIGNAL:
3322 case BREAK_SIGNAL:
3323 jvmHandler = (address)user_handler();
3324 break;
3325
3326 default:
3327 if (sig == SR_signum) {
3328 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3329 } else {
3330 return;
3331 }
3332 break;
3333 }
3334
3335 if (thisHandler != jvmHandler) {
3336 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3337 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3338 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3339 // No need to check this sig any longer
3340 sigaddset(&check_signal_done, sig);
3341 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3342 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3343 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3344 exception_name(sig, buf, O_BUFLEN));
3345 }
3346 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3347 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3348 tty->print("expected:");
3349 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3350 tty->cr();
3351 tty->print(" found:");
3352 os::Posix::print_sa_flags(tty, act.sa_flags);
3353 tty->cr();
3354 // No need to check this sig any longer
3355 sigaddset(&check_signal_done, sig);
3356 }
3357
3358 // Dump all the signal
3359 if (sigismember(&check_signal_done, sig)) {
3360 print_signal_handlers(tty, buf, O_BUFLEN);
3361 }
3362 }
3363
3364 // To install functions for atexit system call
3365 extern "C" {
3366 static void perfMemory_exit_helper() {
3367 perfMemory_exit();
3368 }
3369 }
3370
3371 // This is called _before_ the most of global arguments have been parsed.
3372 void os::init(void) {
3373 // This is basic, we want to know if that ever changes.
3374 // (Shared memory boundary is supposed to be a 256M aligned.)
3375 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3376
3377 // Record process break at startup.
3378 g_brk_at_startup = (address) ::sbrk(0);
3379 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3380
3381 // First off, we need to know whether we run on AIX or PASE, and
3382 // the OS level we run on.
3383 os::Aix::initialize_os_info();
3384
3385 // Scan environment (SPEC1170 behaviour, etc).
3386 os::Aix::scan_environment();
3387
3388 // Probe multipage support.
3389 query_multipage_support();
3390
3391 // Act like we only have one page size by eliminating corner cases which
3392 // we did not support very well anyway.
3393 // We have two input conditions:
3394 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3395 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3396 // setting.
3397 // Data segment page size is important for us because it defines the thread stack page
3398 // size, which is needed for guard page handling, stack banging etc.
3399 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3400 // and should be allocated with 64k pages.
3401 //
3402 // So, we do the following:
3403 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3404 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3405 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3406 // 64k no --- AIX 5.2 ? ---
3407 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3408
3409 // We explicitly leave no option to change page size, because only upgrading would work,
3410 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3411
3412 if (g_multipage_support.datapsize == SIZE_4K) {
3413 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3414 if (g_multipage_support.can_use_64K_pages) {
3415 // .. but we are able to use 64K pages dynamically.
3416 // This would be typical for java launchers which are not linked
3417 // with datapsize=64K (like, any other launcher but our own).
3418 //
3419 // In this case it would be smart to allocate the java heap with 64K
3420 // to get the performance benefit, and to fake 64k pages for the
3421 // data segment (when dealing with thread stacks).
3422 //
3423 // However, leave a possibility to downgrade to 4K, using
3424 // -XX:-Use64KPages.
3425 if (Use64KPages) {
3426 trcVerbose("64K page mode (faked for data segment)");
3427 Aix::_page_size = SIZE_64K;
3428 } else {
3429 trcVerbose("4K page mode (Use64KPages=off)");
3430 Aix::_page_size = SIZE_4K;
3431 }
3432 } else {
3433 // .. and not able to allocate 64k pages dynamically. Here, just
3434 // fall back to 4K paged mode and use mmap for everything.
3435 trcVerbose("4K page mode");
3436 Aix::_page_size = SIZE_4K;
3437 FLAG_SET_ERGO(bool, Use64KPages, false);
3438 }
3439 } else {
3440 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3441 // This normally means that we can allocate 64k pages dynamically.
3442 // (There is one special case where this may be false: EXTSHM=on.
3443 // but we decided to not support that mode).
3444 assert0(g_multipage_support.can_use_64K_pages);
3445 Aix::_page_size = SIZE_64K;
3446 trcVerbose("64K page mode");
3447 FLAG_SET_ERGO(bool, Use64KPages, true);
3448 }
3449
3450 // For now UseLargePages is just ignored.
3451 FLAG_SET_ERGO(bool, UseLargePages, false);
3452 _page_sizes[0] = 0;
3453
3454 // debug trace
3455 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3456
3457 // Next, we need to initialize libo4 and libperfstat libraries.
3458 if (os::Aix::on_pase()) {
3459 os::Aix::initialize_libo4();
3460 } else {
3461 os::Aix::initialize_libperfstat();
3462 }
3463
3464 // Reset the perfstat information provided by ODM.
3465 if (os::Aix::on_aix()) {
3466 libperfstat::perfstat_reset();
3467 }
3468
3469 // Now initialze basic system properties. Note that for some of the values we
3470 // need libperfstat etc.
3471 os::Aix::initialize_system_info();
3472
3473 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3474
3475 init_random(1234567);
3476
3477 ThreadCritical::initialize();
3478
3479 // Main_thread points to the aboriginal thread.
3480 Aix::_main_thread = pthread_self();
3481
3482 initial_time_count = os::elapsed_counter();
3483 }
3484
3485 // This is called _after_ the global arguments have been parsed.
3486 jint os::init_2(void) {
3487
3488 if (os::Aix::on_pase()) {
3489 trcVerbose("Running on PASE.");
3490 } else {
3491 trcVerbose("Running on AIX (not PASE).");
3492 }
3493
3494 trcVerbose("processor count: %d", os::_processor_count);
3495 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3496
3497 // Initially build up the loaded dll map.
3498 LoadedLibraries::reload();
3499 if (Verbose) {
3500 trcVerbose("Loaded Libraries: ");
3501 LoadedLibraries::print(tty);
3502 }
3503
3504 const int page_size = Aix::page_size();
3505 const int map_size = page_size;
3506
3507 address map_address = (address) MAP_FAILED;
3508 const int prot = PROT_READ;
3509 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3510
3511 // Use optimized addresses for the polling page,
3512 // e.g. map it to a special 32-bit address.
3513 if (OptimizePollingPageLocation) {
3514 // architecture-specific list of address wishes:
3515 address address_wishes[] = {
3516 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3517 // PPC64: all address wishes are non-negative 32 bit values where
3518 // the lower 16 bits are all zero. we can load these addresses
3519 // with a single ppc_lis instruction.
3520 (address) 0x30000000, (address) 0x31000000,
3521 (address) 0x32000000, (address) 0x33000000,
3522 (address) 0x40000000, (address) 0x41000000,
3523 (address) 0x42000000, (address) 0x43000000,
3524 (address) 0x50000000, (address) 0x51000000,
3525 (address) 0x52000000, (address) 0x53000000,
3526 (address) 0x60000000, (address) 0x61000000,
3527 (address) 0x62000000, (address) 0x63000000
3528 };
3529 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3530
3531 // iterate over the list of address wishes:
3532 for (int i=0; i<address_wishes_length; i++) {
3533 // Try to map with current address wish.
3534 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3535 // fail if the address is already mapped.
3536 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3537 map_size, prot,
3538 flags | MAP_FIXED,
3539 -1, 0);
3540 trcVerbose("SafePoint Polling Page address: %p (wish) => %p",
3541 address_wishes[i], map_address + (ssize_t)page_size);
3542
3543 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3544 // Map succeeded and map_address is at wished address, exit loop.
3545 break;
3546 }
3547
3548 if (map_address != (address) MAP_FAILED) {
3549 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3550 ::munmap(map_address, map_size);
3551 map_address = (address) MAP_FAILED;
3552 }
3553 // Map failed, continue loop.
3554 }
3555 } // end OptimizePollingPageLocation
3556
3557 if (map_address == (address) MAP_FAILED) {
3558 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3559 }
3560 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3561 os::set_polling_page(map_address);
3562
3563 if (!UseMembar) {
3564 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3565 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3566 os::set_memory_serialize_page(mem_serialize_page);
3567
3568 trcVerbose("Memory Serialize Page address: %p - %p, size %IX (%IB)",
3569 mem_serialize_page, mem_serialize_page + Aix::page_size(),
3570 Aix::page_size(), Aix::page_size());
3571 }
3572
3573 // initialize suspend/resume support - must do this before signal_sets_init()
3574 if (SR_initialize() != 0) {
3575 perror("SR_initialize failed");
3576 return JNI_ERR;
3577 }
3578
3579 Aix::signal_sets_init();
3580 Aix::install_signal_handlers();
3581
3582 // Check minimum allowable stack size for thread creation and to initialize
3583 // the java system classes, including StackOverflowError - depends on page
3584 // size. Add two 4K pages for compiler2 recursion in main thread.
3585 // Add in 4*BytesPerWord 4K pages to account for VM stack during
3586 // class initialization depending on 32 or 64 bit VM.
3587 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3588 JavaThread::stack_guard_zone_size() +
3589 JavaThread::stack_shadow_zone_size() +
3590 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K);
3591
3592 os::Aix::min_stack_allowed = align_size_up(os::Aix::min_stack_allowed, os::vm_page_size());
3593
3594 size_t threadStackSizeInBytes = ThreadStackSize * K;
3595 if (threadStackSizeInBytes != 0 &&
3596 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3597 tty->print_cr("\nThe stack size specified is too small, "
3598 "Specify at least %dk",
3599 os::Aix::min_stack_allowed / K);
3600 return JNI_ERR;
3601 }
3602
3603 // Make the stack size a multiple of the page size so that
3604 // the yellow/red zones can be guarded.
3605 // Note that this can be 0, if no default stacksize was set.
3606 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3607
3608 if (UseNUMA) {
3609 UseNUMA = false;
3610 warning("NUMA optimizations are not available on this OS.");
3611 }
3612
3613 if (MaxFDLimit) {
3614 // Set the number of file descriptors to max. print out error
3615 // if getrlimit/setrlimit fails but continue regardless.
3616 struct rlimit nbr_files;
3617 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3618 if (status != 0) {
3619 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3620 } else {
3621 nbr_files.rlim_cur = nbr_files.rlim_max;
3622 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3623 if (status != 0) {
3624 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3625 }
3626 }
3627 }
3628
3629 if (PerfAllowAtExitRegistration) {
3630 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3631 // At exit functions can be delayed until process exit time, which
3632 // can be problematic for embedded VM situations. Embedded VMs should
3633 // call DestroyJavaVM() to assure that VM resources are released.
3634
3635 // Note: perfMemory_exit_helper atexit function may be removed in
3636 // the future if the appropriate cleanup code can be added to the
3637 // VM_Exit VMOperation's doit method.
3638 if (atexit(perfMemory_exit_helper) != 0) {
3639 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3640 }
3641 }
3642
3643 return JNI_OK;
3644 }
3645
3646 // Mark the polling page as unreadable
3647 void os::make_polling_page_unreadable(void) {
3648 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3649 fatal("Could not disable polling page");
3650 }
3651 };
3652
3653 // Mark the polling page as readable
3654 void os::make_polling_page_readable(void) {
3655 // Changed according to os_linux.cpp.
3656 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3657 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3658 }
3659 };
3660
3661 int os::active_processor_count() {
3662 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3663 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3664 return online_cpus;
3665 }
3666
3667 void os::set_native_thread_name(const char *name) {
3668 // Not yet implemented.
3669 return;
3670 }
3671
3672 bool os::distribute_processes(uint length, uint* distribution) {
3673 // Not yet implemented.
3674 return false;
3675 }
3676
3677 bool os::bind_to_processor(uint processor_id) {
3678 // Not yet implemented.
3679 return false;
3680 }
3681
3682 void os::SuspendedThreadTask::internal_do_task() {
3683 if (do_suspend(_thread->osthread())) {
3684 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3685 do_task(context);
3686 do_resume(_thread->osthread());
3687 }
3688 }
3689
3690 class PcFetcher : public os::SuspendedThreadTask {
3691 public:
3692 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3693 ExtendedPC result();
3694 protected:
3695 void do_task(const os::SuspendedThreadTaskContext& context);
3696 private:
3697 ExtendedPC _epc;
3698 };
3699
3700 ExtendedPC PcFetcher::result() {
3701 guarantee(is_done(), "task is not done yet.");
3702 return _epc;
3703 }
3704
3705 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3706 Thread* thread = context.thread();
3707 OSThread* osthread = thread->osthread();
3708 if (osthread->ucontext() != NULL) {
3709 _epc = os::Aix::ucontext_get_pc((const ucontext_t *) context.ucontext());
3710 } else {
3711 // NULL context is unexpected, double-check this is the VMThread.
3712 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3713 }
3714 }
3715
3716 // Suspends the target using the signal mechanism and then grabs the PC before
3717 // resuming the target. Used by the flat-profiler only
3718 ExtendedPC os::get_thread_pc(Thread* thread) {
3719 // Make sure that it is called by the watcher for the VMThread.
3720 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3721 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3722
3723 PcFetcher fetcher(thread);
3724 fetcher.run();
3725 return fetcher.result();
3726 }
3727
3728 ////////////////////////////////////////////////////////////////////////////////
3729 // debug support
3730
3731 bool os::find(address addr, outputStream* st) {
3732
3733 st->print(PTR_FORMAT ": ", addr);
3734
3735 loaded_module_t lm;
3736 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3737 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3738 st->print_cr("%s", lm.path);
3739 return true;
3740 }
3741
3742 return false;
3743 }
3744
3745 ////////////////////////////////////////////////////////////////////////////////
3746 // misc
3747
3748 // This does not do anything on Aix. This is basically a hook for being
3749 // able to use structured exception handling (thread-local exception filters)
3750 // on, e.g., Win32.
3751 void
3752 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3753 JavaCallArguments* args, Thread* thread) {
3754 f(value, method, args, thread);
3755 }
3756
3757 void os::print_statistics() {
3758 }
3759
3760 bool os::message_box(const char* title, const char* message) {
3761 int i;
3762 fdStream err(defaultStream::error_fd());
3763 for (i = 0; i < 78; i++) err.print_raw("=");
3764 err.cr();
3765 err.print_raw_cr(title);
3766 for (i = 0; i < 78; i++) err.print_raw("-");
3767 err.cr();
3768 err.print_raw_cr(message);
3769 for (i = 0; i < 78; i++) err.print_raw("=");
3770 err.cr();
3771
3772 char buf[16];
3773 // Prevent process from exiting upon "read error" without consuming all CPU
3774 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3775
3776 return buf[0] == 'y' || buf[0] == 'Y';
3777 }
3778
3779 int os::stat(const char *path, struct stat *sbuf) {
3780 char pathbuf[MAX_PATH];
3781 if (strlen(path) > MAX_PATH - 1) {
3782 errno = ENAMETOOLONG;
3783 return -1;
3784 }
3785 os::native_path(strcpy(pathbuf, path));
3786 return ::stat(pathbuf, sbuf);
3787 }
3788
3789 bool os::check_heap(bool force) {
3790 return true;
3791 }
3792
3793 // Is a (classpath) directory empty?
3794 bool os::dir_is_empty(const char* path) {
3795 DIR *dir = NULL;
3796 struct dirent *ptr;
3797
3798 dir = opendir(path);
3799 if (dir == NULL) return true;
3800
3801 /* Scan the directory */
3802 bool result = true;
3803 char buf[sizeof(struct dirent) + MAX_PATH];
3804 while (result && (ptr = ::readdir(dir)) != NULL) {
3805 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3806 result = false;
3807 }
3808 }
3809 closedir(dir);
3810 return result;
3811 }
3812
3813 // This code originates from JDK's sysOpen and open64_w
3814 // from src/solaris/hpi/src/system_md.c
3815
3816 int os::open(const char *path, int oflag, int mode) {
3817
3818 if (strlen(path) > MAX_PATH - 1) {
3819 errno = ENAMETOOLONG;
3820 return -1;
3821 }
3822 int fd;
3823
3824 fd = ::open64(path, oflag, mode);
3825 if (fd == -1) return -1;
3826
3827 // If the open succeeded, the file might still be a directory.
3828 {
3829 struct stat64 buf64;
3830 int ret = ::fstat64(fd, &buf64);
3831 int st_mode = buf64.st_mode;
3832
3833 if (ret != -1) {
3834 if ((st_mode & S_IFMT) == S_IFDIR) {
3835 errno = EISDIR;
3836 ::close(fd);
3837 return -1;
3838 }
3839 } else {
3840 ::close(fd);
3841 return -1;
3842 }
3843 }
3844
3845 // All file descriptors that are opened in the JVM and not
3846 // specifically destined for a subprocess should have the
3847 // close-on-exec flag set. If we don't set it, then careless 3rd
3848 // party native code might fork and exec without closing all
3849 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3850 // UNIXProcess.c), and this in turn might:
3851 //
3852 // - cause end-of-file to fail to be detected on some file
3853 // descriptors, resulting in mysterious hangs, or
3854 //
3855 // - might cause an fopen in the subprocess to fail on a system
3856 // suffering from bug 1085341.
3857 //
3858 // (Yes, the default setting of the close-on-exec flag is a Unix
3859 // design flaw.)
3860 //
3861 // See:
3862 // 1085341: 32-bit stdio routines should support file descriptors >255
3863 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3864 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3865 #ifdef FD_CLOEXEC
3866 {
3867 int flags = ::fcntl(fd, F_GETFD);
3868 if (flags != -1)
3869 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3870 }
3871 #endif
3872
3873 return fd;
3874 }
3875
3876 // create binary file, rewriting existing file if required
3877 int os::create_binary_file(const char* path, bool rewrite_existing) {
3878 int oflags = O_WRONLY | O_CREAT;
3879 if (!rewrite_existing) {
3880 oflags |= O_EXCL;
3881 }
3882 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3883 }
3884
3885 // return current position of file pointer
3886 jlong os::current_file_offset(int fd) {
3887 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3888 }
3889
3890 // move file pointer to the specified offset
3891 jlong os::seek_to_file_offset(int fd, jlong offset) {
3892 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3893 }
3894
3895 // This code originates from JDK's sysAvailable
3896 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3897
3898 int os::available(int fd, jlong *bytes) {
3899 jlong cur, end;
3900 int mode;
3901 struct stat64 buf64;
3902
3903 if (::fstat64(fd, &buf64) >= 0) {
3904 mode = buf64.st_mode;
3905 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3906 int n;
3907 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3908 *bytes = n;
3909 return 1;
3910 }
3911 }
3912 }
3913 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3914 return 0;
3915 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3916 return 0;
3917 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3918 return 0;
3919 }
3920 *bytes = end - cur;
3921 return 1;
3922 }
3923
3924 // Map a block of memory.
3925 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3926 char *addr, size_t bytes, bool read_only,
3927 bool allow_exec) {
3928 int prot;
3929 int flags = MAP_PRIVATE;
3930
3931 if (read_only) {
3932 prot = PROT_READ;
3933 flags = MAP_SHARED;
3934 } else {
3935 prot = PROT_READ | PROT_WRITE;
3936 flags = MAP_PRIVATE;
3937 }
3938
3939 if (allow_exec) {
3940 prot |= PROT_EXEC;
3941 }
3942
3943 if (addr != NULL) {
3944 flags |= MAP_FIXED;
3945 }
3946
3947 // Allow anonymous mappings if 'fd' is -1.
3948 if (fd == -1) {
3949 flags |= MAP_ANONYMOUS;
3950 }
3951
3952 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3953 fd, file_offset);
3954 if (mapped_address == MAP_FAILED) {
3955 return NULL;
3956 }
3957 return mapped_address;
3958 }
3959
3960 // Remap a block of memory.
3961 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3962 char *addr, size_t bytes, bool read_only,
3963 bool allow_exec) {
3964 // same as map_memory() on this OS
3965 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3966 allow_exec);
3967 }
3968
3969 // Unmap a block of memory.
3970 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3971 return munmap(addr, bytes) == 0;
3972 }
3973
3974 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3975 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3976 // of a thread.
3977 //
3978 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3979 // the fast estimate available on the platform.
3980
3981 jlong os::current_thread_cpu_time() {
3982 // return user + sys since the cost is the same
3983 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3984 assert(n >= 0, "negative CPU time");
3985 return n;
3986 }
3987
3988 jlong os::thread_cpu_time(Thread* thread) {
3989 // consistent with what current_thread_cpu_time() returns
3990 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3991 assert(n >= 0, "negative CPU time");
3992 return n;
3993 }
3994
3995 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3996 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3997 assert(n >= 0, "negative CPU time");
3998 return n;
3999 }
4000
4001 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4002 bool error = false;
4003
4004 jlong sys_time = 0;
4005 jlong user_time = 0;
4006
4007 // Reimplemented using getthrds64().
4008 //
4009 // Works like this:
4010 // For the thread in question, get the kernel thread id. Then get the
4011 // kernel thread statistics using that id.
4012 //
4013 // This only works of course when no pthread scheduling is used,
4014 // i.e. there is a 1:1 relationship to kernel threads.
4015 // On AIX, see AIXTHREAD_SCOPE variable.
4016
4017 pthread_t pthtid = thread->osthread()->pthread_id();
4018
4019 // retrieve kernel thread id for the pthread:
4020 tid64_t tid = 0;
4021 struct __pthrdsinfo pinfo;
4022 // I just love those otherworldly IBM APIs which force me to hand down
4023 // dummy buffers for stuff I dont care for...
4024 char dummy[1];
4025 int dummy_size = sizeof(dummy);
4026 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4027 dummy, &dummy_size) == 0) {
4028 tid = pinfo.__pi_tid;
4029 } else {
4030 tty->print_cr("pthread_getthrds_np failed.");
4031 error = true;
4032 }
4033
4034 // retrieve kernel timing info for that kernel thread
4035 if (!error) {
4036 struct thrdentry64 thrdentry;
4037 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4038 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4039 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4040 } else {
4041 tty->print_cr("pthread_getthrds_np failed.");
4042 error = true;
4043 }
4044 }
4045
4046 if (p_sys_time) {
4047 *p_sys_time = sys_time;
4048 }
4049
4050 if (p_user_time) {
4051 *p_user_time = user_time;
4052 }
4053
4054 if (error) {
4055 return false;
4056 }
4057
4058 return true;
4059 }
4060
4061 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4062 jlong sys_time;
4063 jlong user_time;
4064
4065 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4066 return -1;
4067 }
4068
4069 return user_sys_cpu_time ? sys_time + user_time : user_time;
4070 }
4071
4072 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4073 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4074 info_ptr->may_skip_backward = false; // elapsed time not wall time
4075 info_ptr->may_skip_forward = false; // elapsed time not wall time
4076 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4077 }
4078
4079 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4080 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4081 info_ptr->may_skip_backward = false; // elapsed time not wall time
4082 info_ptr->may_skip_forward = false; // elapsed time not wall time
4083 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4084 }
4085
4086 bool os::is_thread_cpu_time_supported() {
4087 return true;
4088 }
4089
4090 // System loadavg support. Returns -1 if load average cannot be obtained.
4091 // For now just return the system wide load average (no processor sets).
4092 int os::loadavg(double values[], int nelem) {
4093
4094 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4095 guarantee(values, "argument error");
4096
4097 if (os::Aix::on_pase()) {
4098
4099 // AS/400 PASE: use libo4 porting library
4100 double v[3] = { 0.0, 0.0, 0.0 };
4101
4102 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4103 for (int i = 0; i < nelem; i ++) {
4104 values[i] = v[i];
4105 }
4106 return nelem;
4107 } else {
4108 return -1;
4109 }
4110
4111 } else {
4112
4113 // AIX: use libperfstat
4114 libperfstat::cpuinfo_t ci;
4115 if (libperfstat::get_cpuinfo(&ci)) {
4116 for (int i = 0; i < nelem; i++) {
4117 values[i] = ci.loadavg[i];
4118 }
4119 } else {
4120 return -1;
4121 }
4122 return nelem;
4123 }
4124 }
4125
4126 void os::pause() {
4127 char filename[MAX_PATH];
4128 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4129 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4130 } else {
4131 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4132 }
4133
4134 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4135 if (fd != -1) {
4136 struct stat buf;
4137 ::close(fd);
4138 while (::stat(filename, &buf) == 0) {
4139 (void)::poll(NULL, 0, 100);
4140 }
4141 } else {
4142 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4143 }
4144 }
4145
4146 bool os::Aix::is_primordial_thread() {
4147 if (pthread_self() == (pthread_t)1) {
4148 return true;
4149 } else {
4150 return false;
4151 }
4152 }
4153
4154 // OS recognitions (PASE/AIX, OS level) call this before calling any
4155 // one of Aix::on_pase(), Aix::os_version() static
4156 void os::Aix::initialize_os_info() {
4157
4158 assert(_on_pase == -1 && _os_version == 0, "already called.");
4159
4160 struct utsname uts;
4161 memset(&uts, 0, sizeof(uts));
4162 strcpy(uts.sysname, "?");
4163 if (::uname(&uts) == -1) {
4164 trcVerbose("uname failed (%d)", errno);
4165 guarantee(0, "Could not determine whether we run on AIX or PASE");
4166 } else {
4167 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4168 "node \"%s\" machine \"%s\"\n",
4169 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4170 const int major = atoi(uts.version);
4171 assert(major > 0, "invalid OS version");
4172 const int minor = atoi(uts.release);
4173 assert(minor > 0, "invalid OS release");
4174 _os_version = (major << 24) | (minor << 16);
4175 char ver_str[20] = {0};
4176 char *name_str = "unknown OS";
4177 if (strcmp(uts.sysname, "OS400") == 0) {
4178 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4179 _on_pase = 1;
4180 if (os_version_short() < 0x0504) {
4181 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4182 assert(false, "OS/400 release too old.");
4183 }
4184 name_str = "OS/400 (pase)";
4185 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4186 } else if (strcmp(uts.sysname, "AIX") == 0) {
4187 // We run on AIX. We do not support versions older than AIX 5.3.
4188 _on_pase = 0;
4189 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4190 odmWrapper::determine_os_kernel_version(&_os_version);
4191 if (os_version_short() < 0x0503) {
4192 trcVerbose("AIX release older than AIX 5.3 not supported.");
4193 assert(false, "AIX release too old.");
4194 }
4195 name_str = "AIX";
4196 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4197 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4198 } else {
4199 assert(false, name_str);
4200 }
4201 trcVerbose("We run on %s %s", name_str, ver_str);
4202 }
4203
4204 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4205 } // end: os::Aix::initialize_os_info()
4206
4207 // Scan environment for important settings which might effect the VM.
4208 // Trace out settings. Warn about invalid settings and/or correct them.
4209 //
4210 // Must run after os::Aix::initialue_os_info().
4211 void os::Aix::scan_environment() {
4212
4213 char* p;
4214 int rc;
4215
4216 // Warn explicity if EXTSHM=ON is used. That switch changes how
4217 // System V shared memory behaves. One effect is that page size of
4218 // shared memory cannot be change dynamically, effectivly preventing
4219 // large pages from working.
4220 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4221 // recommendation is (in OSS notes) to switch it off.
4222 p = ::getenv("EXTSHM");
4223 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4224 if (p && strcasecmp(p, "ON") == 0) {
4225 _extshm = 1;
4226 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4227 if (!AllowExtshm) {
4228 // We allow under certain conditions the user to continue. However, we want this
4229 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4230 // that the VM is not able to allocate 64k pages for the heap.
4231 // We do not want to run with reduced performance.
4232 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4233 }
4234 } else {
4235 _extshm = 0;
4236 }
4237
4238 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4239 // Not tested, not supported.
4240 //
4241 // Note that it might be worth the trouble to test and to require it, if only to
4242 // get useful return codes for mprotect.
4243 //
4244 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4245 // exec() ? before loading the libjvm ? ....)
4246 p = ::getenv("XPG_SUS_ENV");
4247 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4248 if (p && strcmp(p, "ON") == 0) {
4249 _xpg_sus_mode = 1;
4250 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4251 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4252 // clobber address ranges. If we ever want to support that, we have to do some
4253 // testing first.
4254 guarantee(false, "XPG_SUS_ENV=ON not supported");
4255 } else {
4256 _xpg_sus_mode = 0;
4257 }
4258
4259 if (os::Aix::on_pase()) {
4260 p = ::getenv("QIBM_MULTI_THREADED");
4261 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4262 }
4263
4264 p = ::getenv("LDR_CNTRL");
4265 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4266 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4267 if (p && ::strstr(p, "TEXTPSIZE")) {
4268 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4269 "you may experience hangs or crashes on OS/400 V7R1.");
4270 }
4271 }
4272
4273 p = ::getenv("AIXTHREAD_GUARDPAGES");
4274 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4275
4276 } // end: os::Aix::scan_environment()
4277
4278 // PASE: initialize the libo4 library (PASE porting library).
4279 void os::Aix::initialize_libo4() {
4280 guarantee(os::Aix::on_pase(), "OS/400 only.");
4281 if (!libo4::init()) {
4282 trcVerbose("libo4 initialization failed.");
4283 assert(false, "libo4 initialization failed");
4284 } else {
4285 trcVerbose("libo4 initialized.");
4286 }
4287 }
4288
4289 // AIX: initialize the libperfstat library.
4290 void os::Aix::initialize_libperfstat() {
4291 assert(os::Aix::on_aix(), "AIX only");
4292 if (!libperfstat::init()) {
4293 trcVerbose("libperfstat initialization failed.");
4294 assert(false, "libperfstat initialization failed");
4295 } else {
4296 trcVerbose("libperfstat initialized.");
4297 }
4298 }
4299
4300 /////////////////////////////////////////////////////////////////////////////
4301 // thread stack
4302
4303 // Function to query the current stack size using pthread_getthrds_np.
4304 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4305 // This only works when invoked on a pthread. As we agreed not to use
4306 // primordial threads anyway, I assert here.
4307 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4308
4309 // Information about this api can be found (a) in the pthread.h header and
4310 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4311 //
4312 // The use of this API to find out the current stack is kind of undefined.
4313 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4314 // enough for cases where I let the pthread library create its stacks. For cases
4315 // where I create an own stack and pass this to pthread_create, it seems not to
4316 // work (the returned stack size in that case is 0).
4317
4318 pthread_t tid = pthread_self();
4319 struct __pthrdsinfo pinfo;
4320 char dummy[1]; // Just needed to satisfy pthread_getthrds_np.
4321 int dummy_size = sizeof(dummy);
4322
4323 memset(&pinfo, 0, sizeof(pinfo));
4324
4325 const int rc = pthread_getthrds_np(&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4326 sizeof(pinfo), dummy, &dummy_size);
4327
4328 if (rc != 0) {
4329 assert0(false);
4330 trcVerbose("pthread_getthrds_np failed (%d)", rc);
4331 return false;
4332 }
4333 guarantee0(pinfo.__pi_stackend);
4334
4335 // The following may happen when invoking pthread_getthrds_np on a pthread
4336 // running on a user provided stack (when handing down a stack to pthread
4337 // create, see pthread_attr_setstackaddr).
4338 // Not sure what to do then.
4339
4340 guarantee0(pinfo.__pi_stacksize);
4341
4342 // Note: we get three values from pthread_getthrds_np:
4343 // __pi_stackaddr, __pi_stacksize, __pi_stackend
4344 //
4345 // high addr ---------------------
4346 //
4347 // | pthread internal data, like ~2K
4348 // |
4349 // | --------------------- __pi_stackend (usually not page aligned, (xxxxF890))
4350 // |
4351 // |
4352 // |
4353 // |
4354 // |
4355 // |
4356 // | --------------------- (__pi_stackend - __pi_stacksize)
4357 // |
4358 // | padding to align the following AIX guard pages, if enabled.
4359 // |
4360 // V --------------------- __pi_stackaddr
4361 //
4362 // low addr AIX guard pages, if enabled (AIXTHREAD_GUARDPAGES > 0)
4363 //
4364
4365 address stack_base = (address)(pinfo.__pi_stackend);
4366 address stack_low_addr = (address)align_ptr_up(pinfo.__pi_stackaddr,
4367 os::vm_page_size());
4368 size_t stack_size = stack_base - stack_low_addr;
4369
4370 if (p_stack_base) {
4371 *p_stack_base = stack_base;
4372 }
4373
4374 if (p_stack_size) {
4375 *p_stack_size = stack_size;
4376 }
4377
4378 return true;
4379 }
4380
4381 // Get the current stack base from the OS (actually, the pthread library).
4382 address os::current_stack_base() {
4383 address p;
4384 query_stack_dimensions(&p, 0);
4385 return p;
4386 }
4387
4388 // Get the current stack size from the OS (actually, the pthread library).
4389 size_t os::current_stack_size() {
4390 size_t s;
4391 query_stack_dimensions(0, &s);
4392 return s;
4393 }
4394
4395 // Refer to the comments in os_solaris.cpp park-unpark.
4396
4397 // utility to compute the abstime argument to timedwait:
4398 // millis is the relative timeout time
4399 // abstime will be the absolute timeout time
4400 // TODO: replace compute_abstime() with unpackTime()
4401
4402 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4403 if (millis < 0) millis = 0;
4404 struct timeval now;
4405 int status = gettimeofday(&now, NULL);
4406 assert(status == 0, "gettimeofday");
4407 jlong seconds = millis / 1000;
4408 millis %= 1000;
4409 if (seconds > 50000000) { // see man cond_timedwait(3T)
4410 seconds = 50000000;
4411 }
4412 abstime->tv_sec = now.tv_sec + seconds;
4413 long usec = now.tv_usec + millis * 1000;
4414 if (usec >= 1000000) {
4415 abstime->tv_sec += 1;
4416 usec -= 1000000;
4417 }
4418 abstime->tv_nsec = usec * 1000;
4419 return abstime;
4420 }
4421
4422 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4423 // Conceptually TryPark() should be equivalent to park(0).
4424
4425 int os::PlatformEvent::TryPark() {
4426 for (;;) {
4427 const int v = _Event;
4428 guarantee ((v == 0) || (v == 1), "invariant");
4429 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4430 }
4431 }
4432
4433 void os::PlatformEvent::park() { // AKA "down()"
4434 // Invariant: Only the thread associated with the Event/PlatformEvent
4435 // may call park().
4436 // TODO: assert that _Assoc != NULL or _Assoc == Self
4437 int v;
4438 for (;;) {
4439 v = _Event;
4440 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4441 }
4442 guarantee (v >= 0, "invariant");
4443 if (v == 0) {
4444 // Do this the hard way by blocking ...
4445 int status = pthread_mutex_lock(_mutex);
4446 assert_status(status == 0, status, "mutex_lock");
4447 guarantee (_nParked == 0, "invariant");
4448 ++ _nParked;
4449 while (_Event < 0) {
4450 status = pthread_cond_wait(_cond, _mutex);
4451 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4452 }
4453 -- _nParked;
4454
4455 // In theory we could move the ST of 0 into _Event past the unlock(),
4456 // but then we'd need a MEMBAR after the ST.
4457 _Event = 0;
4458 status = pthread_mutex_unlock(_mutex);
4459 assert_status(status == 0, status, "mutex_unlock");
4460 }
4461 guarantee (_Event >= 0, "invariant");
4462 }
4463
4464 int os::PlatformEvent::park(jlong millis) {
4465 guarantee (_nParked == 0, "invariant");
4466
4467 int v;
4468 for (;;) {
4469 v = _Event;
4470 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4471 }
4472 guarantee (v >= 0, "invariant");
4473 if (v != 0) return OS_OK;
4474
4475 // We do this the hard way, by blocking the thread.
4476 // Consider enforcing a minimum timeout value.
4477 struct timespec abst;
4478 compute_abstime(&abst, millis);
4479
4480 int ret = OS_TIMEOUT;
4481 int status = pthread_mutex_lock(_mutex);
4482 assert_status(status == 0, status, "mutex_lock");
4483 guarantee (_nParked == 0, "invariant");
4484 ++_nParked;
4485
4486 // Object.wait(timo) will return because of
4487 // (a) notification
4488 // (b) timeout
4489 // (c) thread.interrupt
4490 //
4491 // Thread.interrupt and object.notify{All} both call Event::set.
4492 // That is, we treat thread.interrupt as a special case of notification.
4493 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4494 // We assume all ETIME returns are valid.
4495 //
4496 // TODO: properly differentiate simultaneous notify+interrupt.
4497 // In that case, we should propagate the notify to another waiter.
4498
4499 while (_Event < 0) {
4500 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4501 assert_status(status == 0 || status == ETIMEDOUT,
4502 status, "cond_timedwait");
4503 if (!FilterSpuriousWakeups) break; // previous semantics
4504 if (status == ETIMEDOUT) break;
4505 // We consume and ignore EINTR and spurious wakeups.
4506 }
4507 --_nParked;
4508 if (_Event >= 0) {
4509 ret = OS_OK;
4510 }
4511 _Event = 0;
4512 status = pthread_mutex_unlock(_mutex);
4513 assert_status(status == 0, status, "mutex_unlock");
4514 assert (_nParked == 0, "invariant");
4515 return ret;
4516 }
4517
4518 void os::PlatformEvent::unpark() {
4519 int v, AnyWaiters;
4520 for (;;) {
4521 v = _Event;
4522 if (v > 0) {
4523 // The LD of _Event could have reordered or be satisfied
4524 // by a read-aside from this processor's write buffer.
4525 // To avoid problems execute a barrier and then
4526 // ratify the value.
4527 OrderAccess::fence();
4528 if (_Event == v) return;
4529 continue;
4530 }
4531 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4532 }
4533 if (v < 0) {
4534 // Wait for the thread associated with the event to vacate
4535 int status = pthread_mutex_lock(_mutex);
4536 assert_status(status == 0, status, "mutex_lock");
4537 AnyWaiters = _nParked;
4538
4539 if (AnyWaiters != 0) {
4540 // We intentional signal *after* dropping the lock
4541 // to avoid a common class of futile wakeups.
4542 status = pthread_cond_signal(_cond);
4543 assert_status(status == 0, status, "cond_signal");
4544 }
4545 // Mutex should be locked for pthread_cond_signal(_cond).
4546 status = pthread_mutex_unlock(_mutex);
4547 assert_status(status == 0, status, "mutex_unlock");
4548 }
4549
4550 // Note that we signal() _after dropping the lock for "immortal" Events.
4551 // This is safe and avoids a common class of futile wakeups. In rare
4552 // circumstances this can cause a thread to return prematurely from
4553 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4554 // simply re-test the condition and re-park itself.
4555 }
4556
4557
4558 // JSR166
4559 // -------------------------------------------------------
4560
4561 //
4562 // The solaris and linux implementations of park/unpark are fairly
4563 // conservative for now, but can be improved. They currently use a
4564 // mutex/condvar pair, plus a a count.
4565 // Park decrements count if > 0, else does a condvar wait. Unpark
4566 // sets count to 1 and signals condvar. Only one thread ever waits
4567 // on the condvar. Contention seen when trying to park implies that someone
4568 // is unparking you, so don't wait. And spurious returns are fine, so there
4569 // is no need to track notifications.
4570 //
4571
4572 #define MAX_SECS 100000000
4573 //
4574 // This code is common to linux and solaris and will be moved to a
4575 // common place in dolphin.
4576 //
4577 // The passed in time value is either a relative time in nanoseconds
4578 // or an absolute time in milliseconds. Either way it has to be unpacked
4579 // into suitable seconds and nanoseconds components and stored in the
4580 // given timespec structure.
4581 // Given time is a 64-bit value and the time_t used in the timespec is only
4582 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4583 // overflow if times way in the future are given. Further on Solaris versions
4584 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4585 // number of seconds, in abstime, is less than current_time + 100,000,000.
4586 // As it will be 28 years before "now + 100000000" will overflow we can
4587 // ignore overflow and just impose a hard-limit on seconds using the value
4588 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4589 // years from "now".
4590 //
4591
4592 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4593 assert (time > 0, "convertTime");
4594
4595 struct timeval now;
4596 int status = gettimeofday(&now, NULL);
4597 assert(status == 0, "gettimeofday");
4598
4599 time_t max_secs = now.tv_sec + MAX_SECS;
4600
4601 if (isAbsolute) {
4602 jlong secs = time / 1000;
4603 if (secs > max_secs) {
4604 absTime->tv_sec = max_secs;
4605 }
4606 else {
4607 absTime->tv_sec = secs;
4608 }
4609 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4610 }
4611 else {
4612 jlong secs = time / NANOSECS_PER_SEC;
4613 if (secs >= MAX_SECS) {
4614 absTime->tv_sec = max_secs;
4615 absTime->tv_nsec = 0;
4616 }
4617 else {
4618 absTime->tv_sec = now.tv_sec + secs;
4619 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4620 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4621 absTime->tv_nsec -= NANOSECS_PER_SEC;
4622 ++absTime->tv_sec; // note: this must be <= max_secs
4623 }
4624 }
4625 }
4626 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4627 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4628 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4629 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4630 }
4631
4632 void Parker::park(bool isAbsolute, jlong time) {
4633 // Optional fast-path check:
4634 // Return immediately if a permit is available.
4635 if (_counter > 0) {
4636 _counter = 0;
4637 OrderAccess::fence();
4638 return;
4639 }
4640
4641 Thread* thread = Thread::current();
4642 assert(thread->is_Java_thread(), "Must be JavaThread");
4643 JavaThread *jt = (JavaThread *)thread;
4644
4645 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4646 // Check interrupt before trying to wait
4647 if (Thread::is_interrupted(thread, false)) {
4648 return;
4649 }
4650
4651 // Next, demultiplex/decode time arguments
4652 timespec absTime;
4653 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4654 return;
4655 }
4656 if (time > 0) {
4657 unpackTime(&absTime, isAbsolute, time);
4658 }
4659
4660 // Enter safepoint region
4661 // Beware of deadlocks such as 6317397.
4662 // The per-thread Parker:: mutex is a classic leaf-lock.
4663 // In particular a thread must never block on the Threads_lock while
4664 // holding the Parker:: mutex. If safepoints are pending both the
4665 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4666 ThreadBlockInVM tbivm(jt);
4667
4668 // Don't wait if cannot get lock since interference arises from
4669 // unblocking. Also. check interrupt before trying wait
4670 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4671 return;
4672 }
4673
4674 int status;
4675 if (_counter > 0) { // no wait needed
4676 _counter = 0;
4677 status = pthread_mutex_unlock(_mutex);
4678 assert (status == 0, "invariant");
4679 OrderAccess::fence();
4680 return;
4681 }
4682
4683 #ifdef ASSERT
4684 // Don't catch signals while blocked; let the running threads have the signals.
4685 // (This allows a debugger to break into the running thread.)
4686 sigset_t oldsigs;
4687 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4688 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4689 #endif
4690
4691 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4692 jt->set_suspend_equivalent();
4693 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4694
4695 if (time == 0) {
4696 status = pthread_cond_wait (_cond, _mutex);
4697 } else {
4698 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4699 }
4700 assert_status(status == 0 || status == EINTR ||
4701 status == ETIME || status == ETIMEDOUT,
4702 status, "cond_timedwait");
4703
4704 #ifdef ASSERT
4705 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4706 #endif
4707
4708 _counter = 0;
4709 status = pthread_mutex_unlock(_mutex);
4710 assert_status(status == 0, status, "invariant");
4711 // If externally suspended while waiting, re-suspend
4712 if (jt->handle_special_suspend_equivalent_condition()) {
4713 jt->java_suspend_self();
4714 }
4715
4716 OrderAccess::fence();
4717 }
4718
4719 void Parker::unpark() {
4720 int s, status;
4721 status = pthread_mutex_lock(_mutex);
4722 assert (status == 0, "invariant");
4723 s = _counter;
4724 _counter = 1;
4725 if (s < 1) {
4726 status = pthread_mutex_unlock(_mutex);
4727 assert (status == 0, "invariant");
4728 status = pthread_cond_signal (_cond);
4729 assert (status == 0, "invariant");
4730 } else {
4731 pthread_mutex_unlock(_mutex);
4732 assert (status == 0, "invariant");
4733 }
4734 }
4735
4736 extern char** environ;
4737
4738 // Run the specified command in a separate process. Return its exit value,
4739 // or -1 on failure (e.g. can't fork a new process).
4740 // Unlike system(), this function can be called from signal handler. It
4741 // doesn't block SIGINT et al.
4742 int os::fork_and_exec(char* cmd) {
4743 char * argv[4] = {"sh", "-c", cmd, NULL};
4744
4745 pid_t pid = fork();
4746
4747 if (pid < 0) {
4748 // fork failed
4749 return -1;
4750
4751 } else if (pid == 0) {
4752 // child process
4753
4754 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4755 execve("/usr/bin/sh", argv, environ);
4756
4757 // execve failed
4758 _exit(-1);
4759
4760 } else {
4761 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4762 // care about the actual exit code, for now.
4763
4764 int status;
4765
4766 // Wait for the child process to exit. This returns immediately if
4767 // the child has already exited. */
4768 while (waitpid(pid, &status, 0) < 0) {
4769 switch (errno) {
4770 case ECHILD: return 0;
4771 case EINTR: break;
4772 default: return -1;
4773 }
4774 }
4775
4776 if (WIFEXITED(status)) {
4777 // The child exited normally; get its exit code.
4778 return WEXITSTATUS(status);
4779 } else if (WIFSIGNALED(status)) {
4780 // The child exited because of a signal.
4781 // The best value to return is 0x80 + signal number,
4782 // because that is what all Unix shells do, and because
4783 // it allows callers to distinguish between process exit and
4784 // process death by signal.
4785 return 0x80 + WTERMSIG(status);
4786 } else {
4787 // Unknown exit code; pass it through.
4788 return status;
4789 }
4790 }
4791 return -1;
4792 }
4793
4794 // is_headless_jre()
4795 //
4796 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4797 // in order to report if we are running in a headless jre.
4798 //
4799 // Since JDK8 xawt/libmawt.so is moved into the same directory
4800 // as libawt.so, and renamed libawt_xawt.so
4801 bool os::is_headless_jre() {
4802 struct stat statbuf;
4803 char buf[MAXPATHLEN];
4804 char libmawtpath[MAXPATHLEN];
4805 const char *xawtstr = "/xawt/libmawt.so";
4806 const char *new_xawtstr = "/libawt_xawt.so";
4807
4808 char *p;
4809
4810 // Get path to libjvm.so
4811 os::jvm_path(buf, sizeof(buf));
4812
4813 // Get rid of libjvm.so
4814 p = strrchr(buf, '/');
4815 if (p == NULL) return false;
4816 else *p = '\0';
4817
4818 // Get rid of client or server
4819 p = strrchr(buf, '/');
4820 if (p == NULL) return false;
4821 else *p = '\0';
4822
4823 // check xawt/libmawt.so
4824 strcpy(libmawtpath, buf);
4825 strcat(libmawtpath, xawtstr);
4826 if (::stat(libmawtpath, &statbuf) == 0) return false;
4827
4828 // check libawt_xawt.so
4829 strcpy(libmawtpath, buf);
4830 strcat(libmawtpath, new_xawtstr);
4831 if (::stat(libmawtpath, &statbuf) == 0) return false;
4832
4833 return true;
4834 }
4835
4836 // Get the default path to the core file
4837 // Returns the length of the string
4838 int os::get_core_path(char* buffer, size_t bufferSize) {
4839 const char* p = get_current_directory(buffer, bufferSize);
4840
4841 if (p == NULL) {
4842 assert(p != NULL, "failed to get current directory");
4843 return 0;
4844 }
4845
4846 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4847 p, current_process_id());
4848
4849 return strlen(buffer);
4850 }
4851
4852 #ifndef PRODUCT
4853 void TestReserveMemorySpecial_test() {
4854 // No tests available for this platform
4855 }
4856 #endif
4857
4858 bool os::start_debugging(char *buf, int buflen) {
4859 int len = (int)strlen(buf);
4860 char *p = &buf[len];
4861
4862 jio_snprintf(p, buflen -len,
4863 "\n\n"
4864 "Do you want to debug the problem?\n\n"
4865 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4866 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4867 "Otherwise, press RETURN to abort...",
4868 os::current_process_id(),
4869 os::current_thread_id(), thread_self());
4870
4871 bool yes = os::message_box("Unexpected Error", buf);
4872
4873 if (yes) {
4874 // yes, user asked VM to launch debugger
4875 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4876
4877 os::fork_and_exec(buf);
4878 yes = false;
4879 }
4880 return yes;
4881 }
4882
4883 static inline time_t get_mtime(const char* filename) {
4884 struct stat st;
4885 int ret = os::stat(filename, &st);
4886 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4887 return st.st_mtime;
4888 }
4889
4890 int os::compare_file_modified_times(const char* file1, const char* file2) {
4891 time_t t1 = get_mtime(file1);
4892 time_t t2 = get_mtime(file2);
4893 return t1 - t2;
4894 }