1 /*
2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2015 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_aix.h"
39 #include "libperfstat_aix.hpp"
40 #include "loadlib_aix.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/filemap.hpp"
43 #include "mutex_aix.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "os_aix.inline.hpp"
46 #include "os_share_aix.hpp"
47 #include "porting_aix.hpp"
48 #include "prims/jniFastGetField.hpp"
49 #include "prims/jvm.h"
50 #include "prims/jvm_misc.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/atomic.inline.hpp"
53 #include "runtime/extendedPC.hpp"
54 #include "runtime/globals.hpp"
55 #include "runtime/interfaceSupport.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/mutexLocker.hpp"
59 #include "runtime/objectMonitor.hpp"
60 #include "runtime/orderAccess.inline.hpp"
61 #include "runtime/os.hpp"
62 #include "runtime/osThread.hpp"
63 #include "runtime/perfMemory.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/statSampler.hpp"
66 #include "runtime/stubRoutines.hpp"
67 #include "runtime/thread.inline.hpp"
68 #include "runtime/threadCritical.hpp"
69 #include "runtime/timer.hpp"
70 #include "runtime/vm_version.hpp"
71 #include "services/attachListener.hpp"
72 #include "services/runtimeService.hpp"
73 #include "utilities/decoder.hpp"
74 #include "utilities/defaultStream.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/vmError.hpp"
78
79 // put OS-includes here (sorted alphabetically)
80 #include <errno.h>
81 #include <fcntl.h>
82 #include <inttypes.h>
83 #include <poll.h>
84 #include <procinfo.h>
85 #include <pthread.h>
86 #include <pwd.h>
87 #include <semaphore.h>
88 #include <signal.h>
89 #include <stdint.h>
90 #include <stdio.h>
91 #include <string.h>
92 #include <unistd.h>
93 #include <sys/ioctl.h>
94 #include <sys/ipc.h>
95 #include <sys/mman.h>
96 #include <sys/resource.h>
97 #include <sys/select.h>
98 #include <sys/shm.h>
99 #include <sys/socket.h>
100 #include <sys/stat.h>
101 #include <sys/sysinfo.h>
102 #include <sys/systemcfg.h>
103 #include <sys/time.h>
104 #include <sys/times.h>
105 #include <sys/types.h>
106 #include <sys/utsname.h>
107 #include <sys/vminfo.h>
108 #include <sys/wait.h>
109
110 // If RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling
111 // getrusage() is prepared to handle the associated failure.
112 #ifndef RUSAGE_THREAD
113 #define RUSAGE_THREAD (1) /* only the calling thread */
114 #endif
115
116 // PPC port
117 static const uintx Use64KPagesThreshold = 1*M;
118 static const uintx MaxExpectedDataSegmentSize = SIZE_4G*2;
119
120 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
121 #if !defined(_AIXVERSION_610)
122 extern "C" {
123 int getthrds64(pid_t ProcessIdentifier,
124 struct thrdentry64* ThreadBuffer,
125 int ThreadSize,
126 tid64_t* IndexPointer,
127 int Count);
128 }
129 #endif
130
131 #define MAX_PATH (2 * K)
132
133 // for timer info max values which include all bits
134 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
135 // for multipage initialization error analysis (in 'g_multipage_error')
136 #define ERROR_MP_OS_TOO_OLD 100
137 #define ERROR_MP_EXTSHM_ACTIVE 101
138 #define ERROR_MP_VMGETINFO_FAILED 102
139 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
140
141 // The semantics in this file are thus that codeptr_t is a *real code ptr*.
142 // This means that any function taking codeptr_t as arguments will assume
143 // a real codeptr and won't handle function descriptors (eg getFuncName),
144 // whereas functions taking address as args will deal with function
145 // descriptors (eg os::dll_address_to_library_name).
146 typedef unsigned int* codeptr_t;
147
148 // Typedefs for stackslots, stack pointers, pointers to op codes.
149 typedef unsigned long stackslot_t;
150 typedef stackslot_t* stackptr_t;
151
152 // Excerpts from systemcfg.h definitions newer than AIX 5.3.
153 #ifndef PV_7
154 #define PV_7 0x200000 /* Power PC 7 */
155 #define PV_7_Compat 0x208000 /* Power PC 7 */
156 #endif
157 #ifndef PV_8
158 #define PV_8 0x300000 /* Power PC 8 */
159 #define PV_8_Compat 0x308000 /* Power PC 8 */
160 #endif
161
162 #define trcVerbose(fmt, ...) { /* PPC port */ \
163 if (Verbose) { \
164 fprintf(stderr, fmt, ##__VA_ARGS__); \
165 fputc('\n', stderr); fflush(stderr); \
166 } \
167 }
168 #define trc(fmt, ...) /* PPC port */
169
170 #define ERRBYE(s) { \
171 trcVerbose(s); \
172 return -1; \
173 }
174
175 // Query dimensions of the stack of the calling thread.
176 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
177
178 // function to check a given stack pointer against given stack limits
179 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
180 if (((uintptr_t)sp) & 0x7) {
181 return false;
182 }
183 if (sp > stack_base) {
184 return false;
185 }
186 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
187 return false;
188 }
189 return true;
190 }
191
192 // returns true if function is a valid codepointer
193 inline bool is_valid_codepointer(codeptr_t p) {
194 if (!p) {
195 return false;
196 }
197 if (((uintptr_t)p) & 0x3) {
198 return false;
199 }
200 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
201 return false;
202 }
203 return true;
204 }
205
206 // Macro to check a given stack pointer against given stack limits and to die if test fails.
207 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
208 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
209 }
210
211 // Macro to check the current stack pointer against given stacklimits.
212 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
213 address sp; \
214 sp = os::current_stack_pointer(); \
215 CHECK_STACK_PTR(sp, stack_base, stack_size); \
216 }
217
218 ////////////////////////////////////////////////////////////////////////////////
219 // global variables (for a description see os_aix.hpp)
220
221 julong os::Aix::_physical_memory = 0;
222 pthread_t os::Aix::_main_thread = ((pthread_t)0);
223 int os::Aix::_page_size = -1;
224 int os::Aix::_on_pase = -1;
225 int os::Aix::_os_version = -1;
226 int os::Aix::_stack_page_size = -1;
227 int os::Aix::_xpg_sus_mode = -1;
228 int os::Aix::_extshm = -1;
229 int os::Aix::_logical_cpus = -1;
230
231 ////////////////////////////////////////////////////////////////////////////////
232 // local variables
233
234 static int g_multipage_error = -1; // error analysis for multipage initialization
235 static jlong initial_time_count = 0;
236 static int clock_tics_per_sec = 100;
237 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
238 static bool check_signals = true;
239 static pid_t _initial_pid = 0;
240 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
241 static sigset_t SR_sigset;
242
243 // This describes the state of multipage support of the underlying
244 // OS. Note that this is of no interest to the outsize world and
245 // therefore should not be defined in AIX class.
246 //
247 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
248 // latter two (16M "large" resp. 16G "huge" pages) require special
249 // setup and are normally not available.
250 //
251 // AIX supports multiple page sizes per process, for:
252 // - Stack (of the primordial thread, so not relevant for us)
253 // - Data - data, bss, heap, for us also pthread stacks
254 // - Text - text code
255 // - shared memory
256 //
257 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
258 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
259 //
260 // For shared memory, page size can be set dynamically via
261 // shmctl(). Different shared memory regions can have different page
262 // sizes.
263 //
264 // More information can be found at AIBM info center:
265 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
266 //
267 static struct {
268 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
269 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
270 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
271 size_t pthr_stack_pagesize; // stack page size of pthread threads
272 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
273 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
274 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
275 int error; // Error describing if something went wrong at multipage init.
276 } g_multipage_support = {
277 (size_t) -1,
278 (size_t) -1,
279 (size_t) -1,
280 (size_t) -1,
281 (size_t) -1,
282 false, false,
283 0
284 };
285
286 // We must not accidentally allocate memory close to the BRK - even if
287 // that would work - because then we prevent the BRK segment from
288 // growing which may result in a malloc OOM even though there is
289 // enough memory. The problem only arises if we shmat() or mmap() at
290 // a specific wish address, e.g. to place the heap in a
291 // compressed-oops-friendly way.
292 static bool is_close_to_brk(address a) {
293 address a1 = (address) sbrk(0);
294 if (a >= a1 && a < (a1 + MaxExpectedDataSegmentSize)) {
295 return true;
296 }
297 return false;
298 }
299
300 julong os::available_memory() {
301 return Aix::available_memory();
302 }
303
304 julong os::Aix::available_memory() {
305 os::Aix::meminfo_t mi;
306 if (os::Aix::get_meminfo(&mi)) {
307 return mi.real_free;
308 } else {
309 return 0xFFFFFFFFFFFFFFFFLL;
310 }
311 }
312
313 julong os::physical_memory() {
314 return Aix::physical_memory();
315 }
316
317 // Return true if user is running as root.
318
319 bool os::have_special_privileges() {
320 static bool init = false;
321 static bool privileges = false;
322 if (!init) {
323 privileges = (getuid() != geteuid()) || (getgid() != getegid());
324 init = true;
325 }
326 return privileges;
327 }
328
329 // Helper function, emulates disclaim64 using multiple 32bit disclaims
330 // because we cannot use disclaim64() on AS/400 and old AIX releases.
331 static bool my_disclaim64(char* addr, size_t size) {
332
333 if (size == 0) {
334 return true;
335 }
336
337 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
338 const unsigned int maxDisclaimSize = 0x40000000;
339
340 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
341 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
342
343 char* p = addr;
344
345 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
346 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
347 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
348 return false;
349 }
350 p += maxDisclaimSize;
351 }
352
353 if (lastDisclaimSize > 0) {
354 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
355 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
356 return false;
357 }
358 }
359
360 return true;
361 }
362
363 // Cpu architecture string
364 #if defined(PPC32)
365 static char cpu_arch[] = "ppc";
366 #elif defined(PPC64)
367 static char cpu_arch[] = "ppc64";
368 #else
369 #error Add appropriate cpu_arch setting
370 #endif
371
372
373 // Given an address, returns the size of the page backing that address.
374 size_t os::Aix::query_pagesize(void* addr) {
375
376 vm_page_info pi;
377 pi.addr = (uint64_t)addr;
378 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
379 return pi.pagesize;
380 } else {
381 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
382 assert(false, "vmgetinfo failed to retrieve page size");
383 return SIZE_4K;
384 }
385
386 }
387
388 // Returns the kernel thread id of the currently running thread.
389 pid_t os::Aix::gettid() {
390 return (pid_t) thread_self();
391 }
392
393 void os::Aix::initialize_system_info() {
394
395 // Get the number of online(logical) cpus instead of configured.
396 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
397 assert(_processor_count > 0, "_processor_count must be > 0");
398
399 // Retrieve total physical storage.
400 os::Aix::meminfo_t mi;
401 if (!os::Aix::get_meminfo(&mi)) {
402 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
403 assert(false, "os::Aix::get_meminfo failed.");
404 }
405 _physical_memory = (julong) mi.real_total;
406 }
407
408 // Helper function for tracing page sizes.
409 static const char* describe_pagesize(size_t pagesize) {
410 switch (pagesize) {
411 case SIZE_4K : return "4K";
412 case SIZE_64K: return "64K";
413 case SIZE_16M: return "16M";
414 case SIZE_16G: return "16G";
415 case -1: return "not set";
416 default:
417 assert(false, "surprise");
418 return "??";
419 }
420 }
421
422 // Probe OS for multipage support.
423 // Will fill the global g_multipage_support structure.
424 // Must be called before calling os::large_page_init().
425 static void query_multipage_support() {
426
427 guarantee(g_multipage_support.pagesize == -1,
428 "do not call twice");
429
430 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
431
432 // This really would surprise me.
433 assert(g_multipage_support.pagesize == SIZE_4K, "surprise!");
434
435 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
436 // Default data page size is defined either by linker options (-bdatapsize)
437 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
438 // default should be 4K.
439 {
440 void* p = ::malloc(SIZE_16M);
441 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
442 ::free(p);
443 }
444
445 // Query default shm page size (LDR_CNTRL SHMPSIZE).
446 {
447 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
448 guarantee(shmid != -1, "shmget failed");
449 void* p = ::shmat(shmid, NULL, 0);
450 ::shmctl(shmid, IPC_RMID, NULL);
451 guarantee(p != (void*) -1, "shmat failed");
452 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
453 ::shmdt(p);
454 }
455
456 // Before querying the stack page size, make sure we are not running as primordial
457 // thread (because primordial thread's stack may have different page size than
458 // pthread thread stacks). Running a VM on the primordial thread won't work for a
459 // number of reasons so we may just as well guarantee it here.
460 guarantee0(!os::Aix::is_primordial_thread());
461
462 // Query pthread stack page size.
463 {
464 int dummy = 0;
465 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
466 }
467
468 // Query default text page size (LDR_CNTRL TEXTPSIZE).
469 /* PPC port: so far unused.
470 {
471 address any_function =
472 (address) resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
473 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
474 }
475 */
476
477 // Now probe for support of 64K pages and 16M pages.
478
479 // Before OS/400 V6R1, there is no support for pages other than 4K.
480 if (os::Aix::on_pase_V5R4_or_older()) {
481 Unimplemented();
482 goto query_multipage_support_end;
483 }
484
485 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
486 {
487 const int MAX_PAGE_SIZES = 4;
488 psize_t sizes[MAX_PAGE_SIZES];
489 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
490 if (num_psizes == -1) {
491 trc("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
492 trc("disabling multipage support.\n");
493 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
494 goto query_multipage_support_end;
495 }
496 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
497 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
498 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
499 for (int i = 0; i < num_psizes; i ++) {
500 trcVerbose(" %s ", describe_pagesize(sizes[i]));
501 }
502
503 // Can we use 64K, 16M pages?
504 for (int i = 0; i < num_psizes; i ++) {
505 const size_t pagesize = sizes[i];
506 if (pagesize != SIZE_64K && pagesize != SIZE_16M) {
507 continue;
508 }
509 bool can_use = false;
510 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
511 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
512 IPC_CREAT | S_IRUSR | S_IWUSR);
513 guarantee0(shmid != -1); // Should always work.
514 // Try to set pagesize.
515 struct shmid_ds shm_buf = { 0 };
516 shm_buf.shm_pagesize = pagesize;
517 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
518 const int en = errno;
519 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
520 // PPC port trcVerbose("shmctl(SHM_PAGESIZE) failed with %s",
521 // PPC port MiscUtils::describe_errno(en));
522 } else {
523 // Attach and double check pageisze.
524 void* p = ::shmat(shmid, NULL, 0);
525 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
526 guarantee0(p != (void*) -1); // Should always work.
527 const size_t real_pagesize = os::Aix::query_pagesize(p);
528 if (real_pagesize != pagesize) {
529 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
530 } else {
531 can_use = true;
532 }
533 ::shmdt(p);
534 }
535 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
536 if (pagesize == SIZE_64K) {
537 g_multipage_support.can_use_64K_pages = can_use;
538 } else if (pagesize == SIZE_16M) {
539 g_multipage_support.can_use_16M_pages = can_use;
540 }
541 }
542
543 } // end: check which pages can be used for shared memory
544
545 query_multipage_support_end:
546
547 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s\n",
548 describe_pagesize(g_multipage_support.pagesize));
549 trcVerbose("Data page size (C-Heap, bss, etc): %s\n",
550 describe_pagesize(g_multipage_support.datapsize));
551 trcVerbose("Text page size: %s\n",
552 describe_pagesize(g_multipage_support.textpsize));
553 trcVerbose("Thread stack page size (pthread): %s\n",
554 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
555 trcVerbose("Default shared memory page size: %s\n",
556 describe_pagesize(g_multipage_support.shmpsize));
557 trcVerbose("Can use 64K pages dynamically with shared meory: %s\n",
558 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
559 trcVerbose("Can use 16M pages dynamically with shared memory: %s\n",
560 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
561 trcVerbose("Multipage error details: %d\n",
562 g_multipage_support.error);
563
564 // sanity checks
565 assert0(g_multipage_support.pagesize == SIZE_4K);
566 assert0(g_multipage_support.datapsize == SIZE_4K || g_multipage_support.datapsize == SIZE_64K);
567 // PPC port: so far unused.assert0(g_multipage_support.textpsize == SIZE_4K || g_multipage_support.textpsize == SIZE_64K);
568 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
569 assert0(g_multipage_support.shmpsize == SIZE_4K || g_multipage_support.shmpsize == SIZE_64K);
570
571 } // end os::Aix::query_multipage_support()
572
573 void os::init_system_properties_values() {
574
575 #define DEFAULT_LIBPATH "/usr/lib:/lib"
576 #define EXTENSIONS_DIR "/lib/ext"
577
578 // Buffer that fits several sprintfs.
579 // Note that the space for the trailing null is provided
580 // by the nulls included by the sizeof operator.
581 const size_t bufsize =
582 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
583 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
584 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
585
586 // sysclasspath, java_home, dll_dir
587 {
588 char *pslash;
589 os::jvm_path(buf, bufsize);
590
591 // Found the full path to libjvm.so.
592 // Now cut the path to <java_home>/jre if we can.
593 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
594 pslash = strrchr(buf, '/');
595 if (pslash != NULL) {
596 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
597 }
598 Arguments::set_dll_dir(buf);
599
600 if (pslash != NULL) {
601 pslash = strrchr(buf, '/');
602 if (pslash != NULL) {
603 *pslash = '\0'; // Get rid of /<arch>.
604 pslash = strrchr(buf, '/');
605 if (pslash != NULL) {
606 *pslash = '\0'; // Get rid of /lib.
607 }
608 }
609 }
610 Arguments::set_java_home(buf);
611 set_boot_path('/', ':');
612 }
613
614 // Where to look for native libraries.
615
616 // On Aix we get the user setting of LIBPATH.
617 // Eventually, all the library path setting will be done here.
618 // Get the user setting of LIBPATH.
619 const char *v = ::getenv("LIBPATH");
620 const char *v_colon = ":";
621 if (v == NULL) { v = ""; v_colon = ""; }
622
623 // Concatenate user and invariant part of ld_library_path.
624 // That's +1 for the colon and +1 for the trailing '\0'.
625 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
626 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
627 Arguments::set_library_path(ld_library_path);
628 FREE_C_HEAP_ARRAY(char, ld_library_path);
629
630 // Extensions directories.
631 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
632 Arguments::set_ext_dirs(buf);
633
634 FREE_C_HEAP_ARRAY(char, buf);
635
636 #undef DEFAULT_LIBPATH
637 #undef EXTENSIONS_DIR
638 }
639
640 ////////////////////////////////////////////////////////////////////////////////
641 // breakpoint support
642
643 void os::breakpoint() {
644 BREAKPOINT;
645 }
646
647 extern "C" void breakpoint() {
648 // use debugger to set breakpoint here
649 }
650
651 ////////////////////////////////////////////////////////////////////////////////
652 // signal support
653
654 debug_only(static bool signal_sets_initialized = false);
655 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
656
657 bool os::Aix::is_sig_ignored(int sig) {
658 struct sigaction oact;
659 sigaction(sig, (struct sigaction*)NULL, &oact);
660 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
661 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
662 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
663 return true;
664 } else {
665 return false;
666 }
667 }
668
669 void os::Aix::signal_sets_init() {
670 // Should also have an assertion stating we are still single-threaded.
671 assert(!signal_sets_initialized, "Already initialized");
672 // Fill in signals that are necessarily unblocked for all threads in
673 // the VM. Currently, we unblock the following signals:
674 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
675 // by -Xrs (=ReduceSignalUsage));
676 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
677 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
678 // the dispositions or masks wrt these signals.
679 // Programs embedding the VM that want to use the above signals for their
680 // own purposes must, at this time, use the "-Xrs" option to prevent
681 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
682 // (See bug 4345157, and other related bugs).
683 // In reality, though, unblocking these signals is really a nop, since
684 // these signals are not blocked by default.
685 sigemptyset(&unblocked_sigs);
686 sigemptyset(&allowdebug_blocked_sigs);
687 sigaddset(&unblocked_sigs, SIGILL);
688 sigaddset(&unblocked_sigs, SIGSEGV);
689 sigaddset(&unblocked_sigs, SIGBUS);
690 sigaddset(&unblocked_sigs, SIGFPE);
691 sigaddset(&unblocked_sigs, SIGTRAP);
692 sigaddset(&unblocked_sigs, SIGDANGER);
693 sigaddset(&unblocked_sigs, SR_signum);
694
695 if (!ReduceSignalUsage) {
696 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
697 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
698 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
699 }
700 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
701 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
702 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
703 }
704 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
705 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
706 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
707 }
708 }
709 // Fill in signals that are blocked by all but the VM thread.
710 sigemptyset(&vm_sigs);
711 if (!ReduceSignalUsage)
712 sigaddset(&vm_sigs, BREAK_SIGNAL);
713 debug_only(signal_sets_initialized = true);
714 }
715
716 // These are signals that are unblocked while a thread is running Java.
717 // (For some reason, they get blocked by default.)
718 sigset_t* os::Aix::unblocked_signals() {
719 assert(signal_sets_initialized, "Not initialized");
720 return &unblocked_sigs;
721 }
722
723 // These are the signals that are blocked while a (non-VM) thread is
724 // running Java. Only the VM thread handles these signals.
725 sigset_t* os::Aix::vm_signals() {
726 assert(signal_sets_initialized, "Not initialized");
727 return &vm_sigs;
728 }
729
730 // These are signals that are blocked during cond_wait to allow debugger in
731 sigset_t* os::Aix::allowdebug_blocked_signals() {
732 assert(signal_sets_initialized, "Not initialized");
733 return &allowdebug_blocked_sigs;
734 }
735
736 void os::Aix::hotspot_sigmask(Thread* thread) {
737
738 //Save caller's signal mask before setting VM signal mask
739 sigset_t caller_sigmask;
740 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
741
742 OSThread* osthread = thread->osthread();
743 osthread->set_caller_sigmask(caller_sigmask);
744
745 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
746
747 if (!ReduceSignalUsage) {
748 if (thread->is_VM_thread()) {
749 // Only the VM thread handles BREAK_SIGNAL ...
750 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
751 } else {
752 // ... all other threads block BREAK_SIGNAL
753 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
754 }
755 }
756 }
757
758 // retrieve memory information.
759 // Returns false if something went wrong;
760 // content of pmi undefined in this case.
761 bool os::Aix::get_meminfo(meminfo_t* pmi) {
762
763 assert(pmi, "get_meminfo: invalid parameter");
764
765 memset(pmi, 0, sizeof(meminfo_t));
766
767 if (os::Aix::on_pase()) {
768
769 Unimplemented();
770 return false;
771
772 } else {
773
774 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
775 // See:
776 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
777 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
778 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
779 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
780
781 perfstat_memory_total_t psmt;
782 memset (&psmt, '\0', sizeof(psmt));
783 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
784 if (rc == -1) {
785 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
786 assert(0, "perfstat_memory_total() failed");
787 return false;
788 }
789
790 assert(rc == 1, "perfstat_memory_total() - weird return code");
791
792 // excerpt from
793 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
794 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
795 // The fields of perfstat_memory_total_t:
796 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
797 // u_longlong_t real_total Total real memory (in 4 KB pages).
798 // u_longlong_t real_free Free real memory (in 4 KB pages).
799 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
800 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
801
802 pmi->virt_total = psmt.virt_total * 4096;
803 pmi->real_total = psmt.real_total * 4096;
804 pmi->real_free = psmt.real_free * 4096;
805 pmi->pgsp_total = psmt.pgsp_total * 4096;
806 pmi->pgsp_free = psmt.pgsp_free * 4096;
807
808 return true;
809
810 }
811 } // end os::Aix::get_meminfo
812
813 // Retrieve global cpu information.
814 // Returns false if something went wrong;
815 // the content of pci is undefined in this case.
816 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
817 assert(pci, "get_cpuinfo: invalid parameter");
818 memset(pci, 0, sizeof(cpuinfo_t));
819
820 perfstat_cpu_total_t psct;
821 memset (&psct, '\0', sizeof(psct));
822
823 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
824 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
825 assert(0, "perfstat_cpu_total() failed");
826 return false;
827 }
828
829 // global cpu information
830 strcpy (pci->description, psct.description);
831 pci->processorHZ = psct.processorHZ;
832 pci->ncpus = psct.ncpus;
833 os::Aix::_logical_cpus = psct.ncpus;
834 for (int i = 0; i < 3; i++) {
835 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
836 }
837
838 // get the processor version from _system_configuration
839 switch (_system_configuration.version) {
840 case PV_8:
841 strcpy(pci->version, "Power PC 8");
842 break;
843 case PV_7:
844 strcpy(pci->version, "Power PC 7");
845 break;
846 case PV_6_1:
847 strcpy(pci->version, "Power PC 6 DD1.x");
848 break;
849 case PV_6:
850 strcpy(pci->version, "Power PC 6");
851 break;
852 case PV_5:
853 strcpy(pci->version, "Power PC 5");
854 break;
855 case PV_5_2:
856 strcpy(pci->version, "Power PC 5_2");
857 break;
858 case PV_5_3:
859 strcpy(pci->version, "Power PC 5_3");
860 break;
861 case PV_5_Compat:
862 strcpy(pci->version, "PV_5_Compat");
863 break;
864 case PV_6_Compat:
865 strcpy(pci->version, "PV_6_Compat");
866 break;
867 case PV_7_Compat:
868 strcpy(pci->version, "PV_7_Compat");
869 break;
870 case PV_8_Compat:
871 strcpy(pci->version, "PV_8_Compat");
872 break;
873 default:
874 strcpy(pci->version, "unknown");
875 }
876
877 return true;
878
879 } //end os::Aix::get_cpuinfo
880
881 //////////////////////////////////////////////////////////////////////////////
882 // detecting pthread library
883
884 void os::Aix::libpthread_init() {
885 return;
886 }
887
888 //////////////////////////////////////////////////////////////////////////////
889 // create new thread
890
891 // Thread start routine for all newly created threads
892 static void *java_start(Thread *thread) {
893
894 // find out my own stack dimensions
895 {
896 // actually, this should do exactly the same as thread->record_stack_base_and_size...
897 address base = 0;
898 size_t size = 0;
899 query_stack_dimensions(&base, &size);
900 thread->set_stack_base(base);
901 thread->set_stack_size(size);
902 }
903
904 // Do some sanity checks.
905 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
906
907 // Try to randomize the cache line index of hot stack frames.
908 // This helps when threads of the same stack traces evict each other's
909 // cache lines. The threads can be either from the same JVM instance, or
910 // from different JVM instances. The benefit is especially true for
911 // processors with hyperthreading technology.
912
913 static int counter = 0;
914 int pid = os::current_process_id();
915 alloca(((pid ^ counter++) & 7) * 128);
916
917 ThreadLocalStorage::set_thread(thread);
918
919 OSThread* osthread = thread->osthread();
920
921 // thread_id is kernel thread id (similar to Solaris LWP id)
922 osthread->set_thread_id(os::Aix::gettid());
923
924 // initialize signal mask for this thread
925 os::Aix::hotspot_sigmask(thread);
926
927 // initialize floating point control register
928 os::Aix::init_thread_fpu_state();
929
930 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
931
932 // call one more level start routine
933 thread->run();
934
935 return 0;
936 }
937
938 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
939
940 // We want the whole function to be synchronized.
941 ThreadCritical cs;
942
943 assert(thread->osthread() == NULL, "caller responsible");
944
945 // Allocate the OSThread object
946 OSThread* osthread = new OSThread(NULL, NULL);
947 if (osthread == NULL) {
948 return false;
949 }
950
951 // set the correct thread state
952 osthread->set_thread_type(thr_type);
953
954 // Initial state is ALLOCATED but not INITIALIZED
955 osthread->set_state(ALLOCATED);
956
957 thread->set_osthread(osthread);
958
959 // init thread attributes
960 pthread_attr_t attr;
961 pthread_attr_init(&attr);
962 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
963
964 // Make sure we run in 1:1 kernel-user-thread mode.
965 if (os::Aix::on_aix()) {
966 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
967 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
968 } // end: aix
969
970 // Start in suspended state, and in os::thread_start, wake the thread up.
971 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
972
973 // calculate stack size if it's not specified by caller
974 if (stack_size == 0) {
975 stack_size = os::Aix::default_stack_size(thr_type);
976
977 switch (thr_type) {
978 case os::java_thread:
979 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
980 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
981 stack_size = JavaThread::stack_size_at_create();
982 break;
983 case os::compiler_thread:
984 if (CompilerThreadStackSize > 0) {
985 stack_size = (size_t)(CompilerThreadStackSize * K);
986 break;
987 } // else fall through:
988 // use VMThreadStackSize if CompilerThreadStackSize is not defined
989 case os::vm_thread:
990 case os::pgc_thread:
991 case os::cgc_thread:
992 case os::watcher_thread:
993 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
994 break;
995 }
996 }
997
998 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
999 pthread_attr_setstacksize(&attr, stack_size);
1000
1001 pthread_t tid;
1002 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
1003
1004 pthread_attr_destroy(&attr);
1005
1006 if (ret == 0) {
1007 // PPC port traceOsMisc(("Created New Thread : pthread-id %u", tid));
1008 } else {
1009 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1010 perror("pthread_create()");
1011 }
1012 // Need to clean up stuff we've allocated so far
1013 thread->set_osthread(NULL);
1014 delete osthread;
1015 return false;
1016 }
1017
1018 // Store pthread info into the OSThread
1019 osthread->set_pthread_id(tid);
1020
1021 return true;
1022 }
1023
1024 /////////////////////////////////////////////////////////////////////////////
1025 // attach existing thread
1026
1027 // bootstrap the main thread
1028 bool os::create_main_thread(JavaThread* thread) {
1029 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
1030 return create_attached_thread(thread);
1031 }
1032
1033 bool os::create_attached_thread(JavaThread* thread) {
1034 #ifdef ASSERT
1035 thread->verify_not_published();
1036 #endif
1037
1038 // Allocate the OSThread object
1039 OSThread* osthread = new OSThread(NULL, NULL);
1040
1041 if (osthread == NULL) {
1042 return false;
1043 }
1044
1045 // Store pthread info into the OSThread
1046 osthread->set_thread_id(os::Aix::gettid());
1047 osthread->set_pthread_id(::pthread_self());
1048
1049 // initialize floating point control register
1050 os::Aix::init_thread_fpu_state();
1051
1052 // some sanity checks
1053 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
1054
1055 // Initial thread state is RUNNABLE
1056 osthread->set_state(RUNNABLE);
1057
1058 thread->set_osthread(osthread);
1059
1060 if (UseNUMA) {
1061 int lgrp_id = os::numa_get_group_id();
1062 if (lgrp_id != -1) {
1063 thread->set_lgrp_id(lgrp_id);
1064 }
1065 }
1066
1067 // initialize signal mask for this thread
1068 // and save the caller's signal mask
1069 os::Aix::hotspot_sigmask(thread);
1070
1071 return true;
1072 }
1073
1074 void os::pd_start_thread(Thread* thread) {
1075 int status = pthread_continue_np(thread->osthread()->pthread_id());
1076 assert(status == 0, "thr_continue failed");
1077 }
1078
1079 // Free OS resources related to the OSThread
1080 void os::free_thread(OSThread* osthread) {
1081 assert(osthread != NULL, "osthread not set");
1082
1083 if (Thread::current()->osthread() == osthread) {
1084 // Restore caller's signal mask
1085 sigset_t sigmask = osthread->caller_sigmask();
1086 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1087 }
1088
1089 delete osthread;
1090 }
1091
1092 //////////////////////////////////////////////////////////////////////////////
1093 // thread local storage
1094
1095 int os::allocate_thread_local_storage() {
1096 pthread_key_t key;
1097 int rslt = pthread_key_create(&key, NULL);
1098 assert(rslt == 0, "cannot allocate thread local storage");
1099 return (int)key;
1100 }
1101
1102 // Note: This is currently not used by VM, as we don't destroy TLS key
1103 // on VM exit.
1104 void os::free_thread_local_storage(int index) {
1105 int rslt = pthread_key_delete((pthread_key_t)index);
1106 assert(rslt == 0, "invalid index");
1107 }
1108
1109 void os::thread_local_storage_at_put(int index, void* value) {
1110 int rslt = pthread_setspecific((pthread_key_t)index, value);
1111 assert(rslt == 0, "pthread_setspecific failed");
1112 }
1113
1114 extern "C" Thread* get_thread() {
1115 return ThreadLocalStorage::thread();
1116 }
1117
1118 ////////////////////////////////////////////////////////////////////////////////
1119 // time support
1120
1121 // Time since start-up in seconds to a fine granularity.
1122 // Used by VMSelfDestructTimer and the MemProfiler.
1123 double os::elapsedTime() {
1124 return (double)(os::elapsed_counter()) * 0.000001;
1125 }
1126
1127 jlong os::elapsed_counter() {
1128 timeval time;
1129 int status = gettimeofday(&time, NULL);
1130 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1131 }
1132
1133 jlong os::elapsed_frequency() {
1134 return (1000 * 1000);
1135 }
1136
1137 bool os::supports_vtime() { return true; }
1138 bool os::enable_vtime() { return false; }
1139 bool os::vtime_enabled() { return false; }
1140
1141 double os::elapsedVTime() {
1142 struct rusage usage;
1143 int retval = getrusage(RUSAGE_THREAD, &usage);
1144 if (retval == 0) {
1145 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1146 } else {
1147 // better than nothing, but not much
1148 return elapsedTime();
1149 }
1150 }
1151
1152 jlong os::javaTimeMillis() {
1153 timeval time;
1154 int status = gettimeofday(&time, NULL);
1155 assert(status != -1, "aix error at gettimeofday()");
1156 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1157 }
1158
1159 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1160 timeval time;
1161 int status = gettimeofday(&time, NULL);
1162 assert(status != -1, "aix error at gettimeofday()");
1163 seconds = jlong(time.tv_sec);
1164 nanos = jlong(time.tv_usec) * 1000;
1165 }
1166
1167
1168 // We need to manually declare mread_real_time,
1169 // because IBM didn't provide a prototype in time.h.
1170 // (they probably only ever tested in C, not C++)
1171 extern "C"
1172 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1173
1174 jlong os::javaTimeNanos() {
1175 if (os::Aix::on_pase()) {
1176 Unimplemented();
1177 return 0;
1178 } else {
1179 // On AIX use the precision of processors real time clock
1180 // or time base registers.
1181 timebasestruct_t time;
1182 int rc;
1183
1184 // If the CPU has a time register, it will be used and
1185 // we have to convert to real time first. After convertion we have following data:
1186 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1187 // time.tb_low [nanoseconds after the last full second above]
1188 // We better use mread_real_time here instead of read_real_time
1189 // to ensure that we will get a monotonic increasing time.
1190 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1191 rc = time_base_to_time(&time, TIMEBASE_SZ);
1192 assert(rc != -1, "aix error at time_base_to_time()");
1193 }
1194 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1195 }
1196 }
1197
1198 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1199 info_ptr->max_value = ALL_64_BITS;
1200 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1201 info_ptr->may_skip_backward = false;
1202 info_ptr->may_skip_forward = false;
1203 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1204 }
1205
1206 // Return the real, user, and system times in seconds from an
1207 // arbitrary fixed point in the past.
1208 bool os::getTimesSecs(double* process_real_time,
1209 double* process_user_time,
1210 double* process_system_time) {
1211 struct tms ticks;
1212 clock_t real_ticks = times(&ticks);
1213
1214 if (real_ticks == (clock_t) (-1)) {
1215 return false;
1216 } else {
1217 double ticks_per_second = (double) clock_tics_per_sec;
1218 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1219 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1220 *process_real_time = ((double) real_ticks) / ticks_per_second;
1221
1222 return true;
1223 }
1224 }
1225
1226 char * os::local_time_string(char *buf, size_t buflen) {
1227 struct tm t;
1228 time_t long_time;
1229 time(&long_time);
1230 localtime_r(&long_time, &t);
1231 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1232 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1233 t.tm_hour, t.tm_min, t.tm_sec);
1234 return buf;
1235 }
1236
1237 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1238 return localtime_r(clock, res);
1239 }
1240
1241 ////////////////////////////////////////////////////////////////////////////////
1242 // runtime exit support
1243
1244 // Note: os::shutdown() might be called very early during initialization, or
1245 // called from signal handler. Before adding something to os::shutdown(), make
1246 // sure it is async-safe and can handle partially initialized VM.
1247 void os::shutdown() {
1248
1249 // allow PerfMemory to attempt cleanup of any persistent resources
1250 perfMemory_exit();
1251
1252 // needs to remove object in file system
1253 AttachListener::abort();
1254
1255 // flush buffered output, finish log files
1256 ostream_abort();
1257
1258 // Check for abort hook
1259 abort_hook_t abort_hook = Arguments::abort_hook();
1260 if (abort_hook != NULL) {
1261 abort_hook();
1262 }
1263 }
1264
1265 // Note: os::abort() might be called very early during initialization, or
1266 // called from signal handler. Before adding something to os::abort(), make
1267 // sure it is async-safe and can handle partially initialized VM.
1268 void os::abort(bool dump_core, void* siginfo, void* context) {
1269 os::shutdown();
1270 if (dump_core) {
1271 #ifndef PRODUCT
1272 fdStream out(defaultStream::output_fd());
1273 out.print_raw("Current thread is ");
1274 char buf[16];
1275 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1276 out.print_raw_cr(buf);
1277 out.print_raw_cr("Dumping core ...");
1278 #endif
1279 ::abort(); // dump core
1280 }
1281
1282 ::exit(1);
1283 }
1284
1285 // Die immediately, no exit hook, no abort hook, no cleanup.
1286 void os::die() {
1287 ::abort();
1288 }
1289
1290 // This method is a copy of JDK's sysGetLastErrorString
1291 // from src/solaris/hpi/src/system_md.c
1292
1293 size_t os::lasterror(char *buf, size_t len) {
1294 if (errno == 0) return 0;
1295
1296 const char *s = ::strerror(errno);
1297 size_t n = ::strlen(s);
1298 if (n >= len) {
1299 n = len - 1;
1300 }
1301 ::strncpy(buf, s, n);
1302 buf[n] = '\0';
1303 return n;
1304 }
1305
1306 intx os::current_thread_id() { return (intx)pthread_self(); }
1307
1308 int os::current_process_id() {
1309
1310 // This implementation returns a unique pid, the pid of the
1311 // launcher thread that starts the vm 'process'.
1312
1313 // Under POSIX, getpid() returns the same pid as the
1314 // launcher thread rather than a unique pid per thread.
1315 // Use gettid() if you want the old pre NPTL behaviour.
1316
1317 // if you are looking for the result of a call to getpid() that
1318 // returns a unique pid for the calling thread, then look at the
1319 // OSThread::thread_id() method in osThread_linux.hpp file
1320
1321 return (int)(_initial_pid ? _initial_pid : getpid());
1322 }
1323
1324 // DLL functions
1325
1326 const char* os::dll_file_extension() { return ".so"; }
1327
1328 // This must be hard coded because it's the system's temporary
1329 // directory not the java application's temp directory, ala java.io.tmpdir.
1330 const char* os::get_temp_directory() { return "/tmp"; }
1331
1332 static bool file_exists(const char* filename) {
1333 struct stat statbuf;
1334 if (filename == NULL || strlen(filename) == 0) {
1335 return false;
1336 }
1337 return os::stat(filename, &statbuf) == 0;
1338 }
1339
1340 bool os::dll_build_name(char* buffer, size_t buflen,
1341 const char* pname, const char* fname) {
1342 bool retval = false;
1343 // Copied from libhpi
1344 const size_t pnamelen = pname ? strlen(pname) : 0;
1345
1346 // Return error on buffer overflow.
1347 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1348 *buffer = '\0';
1349 return retval;
1350 }
1351
1352 if (pnamelen == 0) {
1353 snprintf(buffer, buflen, "lib%s.so", fname);
1354 retval = true;
1355 } else if (strchr(pname, *os::path_separator()) != NULL) {
1356 int n;
1357 char** pelements = split_path(pname, &n);
1358 for (int i = 0; i < n; i++) {
1359 // Really shouldn't be NULL, but check can't hurt
1360 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1361 continue; // skip the empty path values
1362 }
1363 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1364 if (file_exists(buffer)) {
1365 retval = true;
1366 break;
1367 }
1368 }
1369 // release the storage
1370 for (int i = 0; i < n; i++) {
1371 if (pelements[i] != NULL) {
1372 FREE_C_HEAP_ARRAY(char, pelements[i]);
1373 }
1374 }
1375 if (pelements != NULL) {
1376 FREE_C_HEAP_ARRAY(char*, pelements);
1377 }
1378 } else {
1379 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1380 retval = true;
1381 }
1382 return retval;
1383 }
1384
1385 // Check if addr is inside libjvm.so.
1386 bool os::address_is_in_vm(address addr) {
1387
1388 // Input could be a real pc or a function pointer literal. The latter
1389 // would be a function descriptor residing in the data segment of a module.
1390
1391 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1392 if (lib) {
1393 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1394 return true;
1395 } else {
1396 return false;
1397 }
1398 } else {
1399 lib = LoadedLibraries::find_for_data_address(addr);
1400 if (lib) {
1401 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1402 return true;
1403 } else {
1404 return false;
1405 }
1406 } else {
1407 return false;
1408 }
1409 }
1410 }
1411
1412 // Resolve an AIX function descriptor literal to a code pointer.
1413 // If the input is a valid code pointer to a text segment of a loaded module,
1414 // it is returned unchanged.
1415 // If the input is a valid AIX function descriptor, it is resolved to the
1416 // code entry point.
1417 // If the input is neither a valid function descriptor nor a valid code pointer,
1418 // NULL is returned.
1419 static address resolve_function_descriptor_to_code_pointer(address p) {
1420
1421 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1422 if (lib) {
1423 // its a real code pointer
1424 return p;
1425 } else {
1426 lib = LoadedLibraries::find_for_data_address(p);
1427 if (lib) {
1428 // pointer to data segment, potential function descriptor
1429 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1430 if (LoadedLibraries::find_for_text_address(code_entry)) {
1431 // Its a function descriptor
1432 return code_entry;
1433 }
1434 }
1435 }
1436 return NULL;
1437 }
1438
1439 bool os::dll_address_to_function_name(address addr, char *buf,
1440 int buflen, int *offset,
1441 bool demangle) {
1442 if (offset) {
1443 *offset = -1;
1444 }
1445 // Buf is not optional, but offset is optional.
1446 assert(buf != NULL, "sanity check");
1447 buf[0] = '\0';
1448
1449 // Resolve function ptr literals first.
1450 addr = resolve_function_descriptor_to_code_pointer(addr);
1451 if (!addr) {
1452 return false;
1453 }
1454
1455 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1456 return Decoder::decode(addr, buf, buflen, offset, demangle);
1457 }
1458
1459 static int getModuleName(codeptr_t pc, // [in] program counter
1460 char* p_name, size_t namelen, // [out] optional: function name
1461 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1462 ) {
1463
1464 // initialize output parameters
1465 if (p_name && namelen > 0) {
1466 *p_name = '\0';
1467 }
1468 if (p_errmsg && errmsglen > 0) {
1469 *p_errmsg = '\0';
1470 }
1471
1472 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1473 if (lib) {
1474 if (p_name && namelen > 0) {
1475 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1476 }
1477 return 0;
1478 }
1479
1480 trcVerbose("pc outside any module");
1481
1482 return -1;
1483 }
1484
1485 bool os::dll_address_to_library_name(address addr, char* buf,
1486 int buflen, int* offset) {
1487 if (offset) {
1488 *offset = -1;
1489 }
1490 // Buf is not optional, but offset is optional.
1491 assert(buf != NULL, "sanity check");
1492 buf[0] = '\0';
1493
1494 // Resolve function ptr literals first.
1495 addr = resolve_function_descriptor_to_code_pointer(addr);
1496 if (!addr) {
1497 return false;
1498 }
1499
1500 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1501 return true;
1502 }
1503 return false;
1504 }
1505
1506 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1507 // for the same architecture as Hotspot is running on.
1508 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1509
1510 if (ebuf && ebuflen > 0) {
1511 ebuf[0] = '\0';
1512 ebuf[ebuflen - 1] = '\0';
1513 }
1514
1515 if (!filename || strlen(filename) == 0) {
1516 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1517 return NULL;
1518 }
1519
1520 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1521 void * result= ::dlopen(filename, RTLD_LAZY);
1522 if (result != NULL) {
1523 // Reload dll cache. Don't do this in signal handling.
1524 LoadedLibraries::reload();
1525 return result;
1526 } else {
1527 // error analysis when dlopen fails
1528 const char* const error_report = ::dlerror();
1529 if (error_report && ebuf && ebuflen > 0) {
1530 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1531 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1532 }
1533 }
1534 return NULL;
1535 }
1536
1537 void* os::dll_lookup(void* handle, const char* name) {
1538 void* res = dlsym(handle, name);
1539 return res;
1540 }
1541
1542 void* os::get_default_process_handle() {
1543 return (void*)::dlopen(NULL, RTLD_LAZY);
1544 }
1545
1546 void os::print_dll_info(outputStream *st) {
1547 st->print_cr("Dynamic libraries:");
1548 LoadedLibraries::print(st);
1549 }
1550
1551 void os::get_summary_os_info(char* buf, size_t buflen) {
1552 // There might be something more readable than uname results for AIX.
1553 struct utsname name;
1554 uname(&name);
1555 snprintf(buf, buflen, "%s %s", name.release, name.version);
1556 }
1557
1558 void os::print_os_info(outputStream* st) {
1559 st->print("OS:");
1560
1561 st->print("uname:");
1562 struct utsname name;
1563 uname(&name);
1564 st->print(name.sysname); st->print(" ");
1565 st->print(name.nodename); st->print(" ");
1566 st->print(name.release); st->print(" ");
1567 st->print(name.version); st->print(" ");
1568 st->print(name.machine);
1569 st->cr();
1570
1571 // rlimit
1572 st->print("rlimit:");
1573 struct rlimit rlim;
1574
1575 st->print(" STACK ");
1576 getrlimit(RLIMIT_STACK, &rlim);
1577 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1578 else st->print("%uk", rlim.rlim_cur >> 10);
1579
1580 st->print(", CORE ");
1581 getrlimit(RLIMIT_CORE, &rlim);
1582 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1583 else st->print("%uk", rlim.rlim_cur >> 10);
1584
1585 st->print(", NPROC ");
1586 st->print("%d", sysconf(_SC_CHILD_MAX));
1587
1588 st->print(", NOFILE ");
1589 getrlimit(RLIMIT_NOFILE, &rlim);
1590 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1591 else st->print("%d", rlim.rlim_cur);
1592
1593 st->print(", AS ");
1594 getrlimit(RLIMIT_AS, &rlim);
1595 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1596 else st->print("%uk", rlim.rlim_cur >> 10);
1597
1598 // Print limits on DATA, because it limits the C-heap.
1599 st->print(", DATA ");
1600 getrlimit(RLIMIT_DATA, &rlim);
1601 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1602 else st->print("%uk", rlim.rlim_cur >> 10);
1603 st->cr();
1604
1605 // load average
1606 st->print("load average:");
1607 double loadavg[3] = {-1.L, -1.L, -1.L};
1608 os::loadavg(loadavg, 3);
1609 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1610 st->cr();
1611 }
1612
1613 void os::print_memory_info(outputStream* st) {
1614
1615 st->print_cr("Memory:");
1616
1617 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1618 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1619 st->print_cr(" Default shared memory page size: %s",
1620 describe_pagesize(g_multipage_support.shmpsize));
1621 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1622 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1623 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1624 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1625 if (g_multipage_error != 0) {
1626 st->print_cr(" multipage error: %d", g_multipage_error);
1627 }
1628
1629 // print out LDR_CNTRL because it affects the default page sizes
1630 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1631 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1632
1633 const char* const extshm = ::getenv("EXTSHM");
1634 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1635 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1636 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1637 }
1638
1639 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1640 os::Aix::meminfo_t mi;
1641 if (os::Aix::get_meminfo(&mi)) {
1642 char buffer[256];
1643 if (os::Aix::on_aix()) {
1644 jio_snprintf(buffer, sizeof(buffer),
1645 " physical total : %llu\n"
1646 " physical free : %llu\n"
1647 " swap total : %llu\n"
1648 " swap free : %llu\n",
1649 mi.real_total,
1650 mi.real_free,
1651 mi.pgsp_total,
1652 mi.pgsp_free);
1653 } else {
1654 Unimplemented();
1655 }
1656 st->print_raw(buffer);
1657 } else {
1658 st->print_cr(" (no more information available)");
1659 }
1660 }
1661
1662 // Get a string for the cpuinfo that is a summary of the cpu type
1663 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1664 // This looks good
1665 os::Aix::cpuinfo_t ci;
1666 if (os::Aix::get_cpuinfo(&ci)) {
1667 strncpy(buf, ci.version, buflen);
1668 } else {
1669 strncpy(buf, "AIX", buflen);
1670 }
1671 }
1672
1673 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1674 }
1675
1676 void os::print_siginfo(outputStream* st, void* siginfo) {
1677 // Use common posix version.
1678 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1679 st->cr();
1680 }
1681
1682 static void print_signal_handler(outputStream* st, int sig,
1683 char* buf, size_t buflen);
1684
1685 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1686 st->print_cr("Signal Handlers:");
1687 print_signal_handler(st, SIGSEGV, buf, buflen);
1688 print_signal_handler(st, SIGBUS , buf, buflen);
1689 print_signal_handler(st, SIGFPE , buf, buflen);
1690 print_signal_handler(st, SIGPIPE, buf, buflen);
1691 print_signal_handler(st, SIGXFSZ, buf, buflen);
1692 print_signal_handler(st, SIGILL , buf, buflen);
1693 print_signal_handler(st, SR_signum, buf, buflen);
1694 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1695 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1696 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1697 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1698 print_signal_handler(st, SIGTRAP, buf, buflen);
1699 print_signal_handler(st, SIGDANGER, buf, buflen);
1700 }
1701
1702 static char saved_jvm_path[MAXPATHLEN] = {0};
1703
1704 // Find the full path to the current module, libjvm.so.
1705 void os::jvm_path(char *buf, jint buflen) {
1706 // Error checking.
1707 if (buflen < MAXPATHLEN) {
1708 assert(false, "must use a large-enough buffer");
1709 buf[0] = '\0';
1710 return;
1711 }
1712 // Lazy resolve the path to current module.
1713 if (saved_jvm_path[0] != 0) {
1714 strcpy(buf, saved_jvm_path);
1715 return;
1716 }
1717
1718 Dl_info dlinfo;
1719 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1720 assert(ret != 0, "cannot locate libjvm");
1721 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1722 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1723
1724 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1725 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1726 }
1727
1728 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1729 // no prefix required, not even "_"
1730 }
1731
1732 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1733 // no suffix required
1734 }
1735
1736 ////////////////////////////////////////////////////////////////////////////////
1737 // sun.misc.Signal support
1738
1739 static volatile jint sigint_count = 0;
1740
1741 static void
1742 UserHandler(int sig, void *siginfo, void *context) {
1743 // 4511530 - sem_post is serialized and handled by the manager thread. When
1744 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1745 // don't want to flood the manager thread with sem_post requests.
1746 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1747 return;
1748
1749 // Ctrl-C is pressed during error reporting, likely because the error
1750 // handler fails to abort. Let VM die immediately.
1751 if (sig == SIGINT && is_error_reported()) {
1752 os::die();
1753 }
1754
1755 os::signal_notify(sig);
1756 }
1757
1758 void* os::user_handler() {
1759 return CAST_FROM_FN_PTR(void*, UserHandler);
1760 }
1761
1762 extern "C" {
1763 typedef void (*sa_handler_t)(int);
1764 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1765 }
1766
1767 void* os::signal(int signal_number, void* handler) {
1768 struct sigaction sigAct, oldSigAct;
1769
1770 sigfillset(&(sigAct.sa_mask));
1771
1772 // Do not block out synchronous signals in the signal handler.
1773 // Blocking synchronous signals only makes sense if you can really
1774 // be sure that those signals won't happen during signal handling,
1775 // when the blocking applies. Normal signal handlers are lean and
1776 // do not cause signals. But our signal handlers tend to be "risky"
1777 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1778 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1779 // by a SIGILL, which was blocked due to the signal mask. The process
1780 // just hung forever. Better to crash from a secondary signal than to hang.
1781 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1782 sigdelset(&(sigAct.sa_mask), SIGBUS);
1783 sigdelset(&(sigAct.sa_mask), SIGILL);
1784 sigdelset(&(sigAct.sa_mask), SIGFPE);
1785 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1786
1787 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1788
1789 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1790
1791 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1792 // -1 means registration failed
1793 return (void *)-1;
1794 }
1795
1796 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1797 }
1798
1799 void os::signal_raise(int signal_number) {
1800 ::raise(signal_number);
1801 }
1802
1803 //
1804 // The following code is moved from os.cpp for making this
1805 // code platform specific, which it is by its very nature.
1806 //
1807
1808 // Will be modified when max signal is changed to be dynamic
1809 int os::sigexitnum_pd() {
1810 return NSIG;
1811 }
1812
1813 // a counter for each possible signal value
1814 static volatile jint pending_signals[NSIG+1] = { 0 };
1815
1816 // Linux(POSIX) specific hand shaking semaphore.
1817 static sem_t sig_sem;
1818
1819 void os::signal_init_pd() {
1820 // Initialize signal structures
1821 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1822
1823 // Initialize signal semaphore
1824 int rc = ::sem_init(&sig_sem, 0, 0);
1825 guarantee(rc != -1, "sem_init failed");
1826 }
1827
1828 void os::signal_notify(int sig) {
1829 Atomic::inc(&pending_signals[sig]);
1830 ::sem_post(&sig_sem);
1831 }
1832
1833 static int check_pending_signals(bool wait) {
1834 Atomic::store(0, &sigint_count);
1835 for (;;) {
1836 for (int i = 0; i < NSIG + 1; i++) {
1837 jint n = pending_signals[i];
1838 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1839 return i;
1840 }
1841 }
1842 if (!wait) {
1843 return -1;
1844 }
1845 JavaThread *thread = JavaThread::current();
1846 ThreadBlockInVM tbivm(thread);
1847
1848 bool threadIsSuspended;
1849 do {
1850 thread->set_suspend_equivalent();
1851 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1852
1853 ::sem_wait(&sig_sem);
1854
1855 // were we externally suspended while we were waiting?
1856 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1857 if (threadIsSuspended) {
1858 //
1859 // The semaphore has been incremented, but while we were waiting
1860 // another thread suspended us. We don't want to continue running
1861 // while suspended because that would surprise the thread that
1862 // suspended us.
1863 //
1864 ::sem_post(&sig_sem);
1865
1866 thread->java_suspend_self();
1867 }
1868 } while (threadIsSuspended);
1869 }
1870 }
1871
1872 int os::signal_lookup() {
1873 return check_pending_signals(false);
1874 }
1875
1876 int os::signal_wait() {
1877 return check_pending_signals(true);
1878 }
1879
1880 ////////////////////////////////////////////////////////////////////////////////
1881 // Virtual Memory
1882
1883 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1884
1885 #define VMEM_MAPPED 1
1886 #define VMEM_SHMATED 2
1887
1888 struct vmembk_t {
1889 int type; // 1 - mmap, 2 - shmat
1890 char* addr;
1891 size_t size; // Real size, may be larger than usersize.
1892 size_t pagesize; // page size of area
1893 vmembk_t* next;
1894
1895 bool contains_addr(char* p) const {
1896 return p >= addr && p < (addr + size);
1897 }
1898
1899 bool contains_range(char* p, size_t s) const {
1900 return contains_addr(p) && contains_addr(p + s - 1);
1901 }
1902
1903 void print_on(outputStream* os) const {
1904 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1905 " bytes, %d %s pages), %s",
1906 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1907 (type == VMEM_SHMATED ? "shmat" : "mmap")
1908 );
1909 }
1910
1911 // Check that range is a sub range of memory block (or equal to memory block);
1912 // also check that range is fully page aligned to the page size if the block.
1913 void assert_is_valid_subrange(char* p, size_t s) const {
1914 if (!contains_range(p, s)) {
1915 fprintf(stderr, "[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1916 "range of [" PTR_FORMAT " - " PTR_FORMAT "].\n",
1917 p, p + s - 1, addr, addr + size - 1);
1918 guarantee0(false);
1919 }
1920 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1921 fprintf(stderr, "range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1922 " aligned to pagesize (%s)\n", p, p + s);
1923 guarantee0(false);
1924 }
1925 }
1926 };
1927
1928 static struct {
1929 vmembk_t* first;
1930 MiscUtils::CritSect cs;
1931 } vmem;
1932
1933 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1934 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1935 assert0(p);
1936 if (p) {
1937 MiscUtils::AutoCritSect lck(&vmem.cs);
1938 p->addr = addr; p->size = size;
1939 p->pagesize = pagesize;
1940 p->type = type;
1941 p->next = vmem.first;
1942 vmem.first = p;
1943 }
1944 }
1945
1946 static vmembk_t* vmembk_find(char* addr) {
1947 MiscUtils::AutoCritSect lck(&vmem.cs);
1948 for (vmembk_t* p = vmem.first; p; p = p->next) {
1949 if (p->addr <= addr && (p->addr + p->size) > addr) {
1950 return p;
1951 }
1952 }
1953 return NULL;
1954 }
1955
1956 static void vmembk_remove(vmembk_t* p0) {
1957 MiscUtils::AutoCritSect lck(&vmem.cs);
1958 assert0(p0);
1959 assert0(vmem.first); // List should not be empty.
1960 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1961 if (*pp == p0) {
1962 *pp = p0->next;
1963 ::free(p0);
1964 return;
1965 }
1966 }
1967 assert0(false); // Not found?
1968 }
1969
1970 static void vmembk_print_on(outputStream* os) {
1971 MiscUtils::AutoCritSect lck(&vmem.cs);
1972 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1973 vmi->print_on(os);
1974 os->cr();
1975 }
1976 }
1977
1978 // Reserve and attach a section of System V memory.
1979 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1980 // address. Failing that, it will attach the memory anywhere.
1981 // If <requested_addr> is NULL, function will attach the memory anywhere.
1982 //
1983 // <alignment_hint> is being ignored by this function. It is very probable however that the
1984 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1985 // Should this be not enogh, we can put more work into it.
1986 static char* reserve_shmated_memory (
1987 size_t bytes,
1988 char* requested_addr,
1989 size_t alignment_hint) {
1990
1991 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1992 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1993 bytes, requested_addr, alignment_hint);
1994
1995 // Either give me wish address or wish alignment but not both.
1996 assert0(!(requested_addr != NULL && alignment_hint != 0));
1997
1998 // We must prevent anyone from attaching too close to the
1999 // BRK because that may cause malloc OOM.
2000 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2001 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2002 "Will attach anywhere.", requested_addr);
2003 // Act like the OS refused to attach there.
2004 requested_addr = NULL;
2005 }
2006
2007 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
2008 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
2009 if (os::Aix::on_pase_V5R4_or_older()) {
2010 ShouldNotReachHere();
2011 }
2012
2013 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
2014 const size_t size = align_size_up(bytes, SIZE_64K);
2015
2016 // Reserve the shared segment.
2017 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2018 if (shmid == -1) {
2019 trc("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
2020 return NULL;
2021 }
2022
2023 // Important note:
2024 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2025 // We must right after attaching it remove it from the system. System V shm segments are global and
2026 // survive the process.
2027 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
2028
2029 struct shmid_ds shmbuf;
2030 memset(&shmbuf, 0, sizeof(shmbuf));
2031 shmbuf.shm_pagesize = SIZE_64K;
2032 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
2033 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
2034 size / SIZE_64K, errno);
2035 // I want to know if this ever happens.
2036 assert(false, "failed to set page size for shmat");
2037 }
2038
2039 // Now attach the shared segment.
2040 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2041 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2042 // were not a segment boundary.
2043 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2044 const int errno_shmat = errno;
2045
2046 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2047 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2048 trc("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2049 assert(false, "failed to remove shared memory segment!");
2050 }
2051
2052 // Handle shmat error. If we failed to attach, just return.
2053 if (addr == (char*)-1) {
2054 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2055 return NULL;
2056 }
2057
2058 // Just for info: query the real page size. In case setting the page size did not
2059 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2060 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2061 if (real_pagesize != shmbuf.shm_pagesize) {
2062 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2063 }
2064
2065 if (addr) {
2066 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2067 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2068 } else {
2069 if (requested_addr != NULL) {
2070 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2071 } else {
2072 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2073 }
2074 }
2075
2076 // book-keeping
2077 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2078 assert0(is_aligned_to(addr, os::vm_page_size()));
2079
2080 return addr;
2081 }
2082
2083 static bool release_shmated_memory(char* addr, size_t size) {
2084
2085 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2086 addr, addr + size - 1);
2087
2088 bool rc = false;
2089
2090 // TODO: is there a way to verify shm size without doing bookkeeping?
2091 if (::shmdt(addr) != 0) {
2092 trcVerbose("error (%d).", errno);
2093 } else {
2094 trcVerbose("ok.");
2095 rc = true;
2096 }
2097 return rc;
2098 }
2099
2100 static bool uncommit_shmated_memory(char* addr, size_t size) {
2101 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2102 addr, addr + size - 1);
2103
2104 const bool rc = my_disclaim64(addr, size);
2105
2106 if (!rc) {
2107 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2108 return false;
2109 }
2110 return true;
2111 }
2112
2113 // Reserve memory via mmap.
2114 // If <requested_addr> is given, an attempt is made to attach at the given address.
2115 // Failing that, memory is allocated at any address.
2116 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2117 // allocate at an address aligned with the given alignment. Failing that, memory
2118 // is aligned anywhere.
2119 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2120 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2121 "alignment_hint " UINTX_FORMAT "...",
2122 bytes, requested_addr, alignment_hint);
2123
2124 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2125 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2126 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2127 return NULL;
2128 }
2129
2130 // We must prevent anyone from attaching too close to the
2131 // BRK because that may cause malloc OOM.
2132 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2133 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2134 "Will attach anywhere.", requested_addr);
2135 // Act like the OS refused to attach there.
2136 requested_addr = NULL;
2137 }
2138
2139 // Specify one or the other but not both.
2140 assert0(!(requested_addr != NULL && alignment_hint > 0));
2141
2142 // In 64K mode, we claim the global page size (os::vm_page_size())
2143 // is 64K. This is one of the few points where that illusion may
2144 // break, because mmap() will always return memory aligned to 4K. So
2145 // we must ensure we only ever return memory aligned to 64k.
2146 if (alignment_hint) {
2147 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2148 } else {
2149 alignment_hint = os::vm_page_size();
2150 }
2151
2152 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2153 const size_t size = align_size_up(bytes, os::vm_page_size());
2154
2155 // alignment: Allocate memory large enough to include an aligned range of the right size and
2156 // cut off the leading and trailing waste pages.
2157 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2158 const size_t extra_size = size + alignment_hint;
2159
2160 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2161 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2162 int flags = MAP_ANONYMOUS | MAP_SHARED;
2163
2164 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2165 // it means if wishaddress is given but MAP_FIXED is not set.
2166 //
2167 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2168 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2169 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2170 // get clobbered.
2171 if (requested_addr != NULL) {
2172 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2173 flags |= MAP_FIXED;
2174 }
2175 }
2176
2177 char* addr = (char*)::mmap(requested_addr, extra_size,
2178 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2179
2180 if (addr == MAP_FAILED) {
2181 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2182 return NULL;
2183 }
2184
2185 // Handle alignment.
2186 char* const addr_aligned = (char *)align_ptr_up(addr, alignment_hint);
2187 const size_t waste_pre = addr_aligned - addr;
2188 char* const addr_aligned_end = addr_aligned + size;
2189 const size_t waste_post = extra_size - waste_pre - size;
2190 if (waste_pre > 0) {
2191 ::munmap(addr, waste_pre);
2192 }
2193 if (waste_post > 0) {
2194 ::munmap(addr_aligned_end, waste_post);
2195 }
2196 addr = addr_aligned;
2197
2198 if (addr) {
2199 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2200 addr, addr + bytes, bytes);
2201 } else {
2202 if (requested_addr != NULL) {
2203 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2204 } else {
2205 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2206 }
2207 }
2208
2209 // bookkeeping
2210 vmembk_add(addr, size, SIZE_4K, VMEM_MAPPED);
2211
2212 // Test alignment, see above.
2213 assert0(is_aligned_to(addr, os::vm_page_size()));
2214
2215 return addr;
2216 }
2217
2218 static bool release_mmaped_memory(char* addr, size_t size) {
2219 assert0(is_aligned_to(addr, os::vm_page_size()));
2220 assert0(is_aligned_to(size, os::vm_page_size()));
2221
2222 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2223 addr, addr + size - 1);
2224 bool rc = false;
2225
2226 if (::munmap(addr, size) != 0) {
2227 trcVerbose("failed (%d)\n", errno);
2228 rc = false;
2229 } else {
2230 trcVerbose("ok.");
2231 rc = true;
2232 }
2233
2234 return rc;
2235 }
2236
2237 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2238
2239 assert0(is_aligned_to(addr, os::vm_page_size()));
2240 assert0(is_aligned_to(size, os::vm_page_size()));
2241
2242 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2243 addr, addr + size - 1);
2244 bool rc = false;
2245
2246 // Uncommit mmap memory with msync MS_INVALIDATE.
2247 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2248 trcVerbose("failed (%d)\n", errno);
2249 rc = false;
2250 } else {
2251 trcVerbose("ok.");
2252 rc = true;
2253 }
2254
2255 return rc;
2256 }
2257
2258 // End: shared memory bookkeeping
2259 ////////////////////////////////////////////////////////////////////////////////////////////////////
2260
2261 int os::vm_page_size() {
2262 // Seems redundant as all get out.
2263 assert(os::Aix::page_size() != -1, "must call os::init");
2264 return os::Aix::page_size();
2265 }
2266
2267 // Aix allocates memory by pages.
2268 int os::vm_allocation_granularity() {
2269 assert(os::Aix::page_size() != -1, "must call os::init");
2270 return os::Aix::page_size();
2271 }
2272
2273 #ifdef PRODUCT
2274 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2275 int err) {
2276 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2277 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2278 strerror(err), err);
2279 }
2280 #endif
2281
2282 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2283 const char* mesg) {
2284 assert(mesg != NULL, "mesg must be specified");
2285 if (!pd_commit_memory(addr, size, exec)) {
2286 // Add extra info in product mode for vm_exit_out_of_memory():
2287 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2288 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2289 }
2290 }
2291
2292 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2293
2294 assert0(is_aligned_to(addr, os::vm_page_size()));
2295 assert0(is_aligned_to(size, os::vm_page_size()));
2296
2297 vmembk_t* const vmi = vmembk_find(addr);
2298 assert0(vmi);
2299 vmi->assert_is_valid_subrange(addr, size);
2300
2301 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2302
2303 return true;
2304 }
2305
2306 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2307 return pd_commit_memory(addr, size, exec);
2308 }
2309
2310 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2311 size_t alignment_hint, bool exec,
2312 const char* mesg) {
2313 // Alignment_hint is ignored on this OS.
2314 pd_commit_memory_or_exit(addr, size, exec, mesg);
2315 }
2316
2317 bool os::pd_uncommit_memory(char* addr, size_t size) {
2318 assert0(is_aligned_to(addr, os::vm_page_size()));
2319 assert0(is_aligned_to(size, os::vm_page_size()));
2320
2321 // Dynamically do different things for mmap/shmat.
2322 const vmembk_t* const vmi = vmembk_find(addr);
2323 assert0(vmi);
2324 vmi->assert_is_valid_subrange(addr, size);
2325
2326 if (vmi->type == VMEM_SHMATED) {
2327 return uncommit_shmated_memory(addr, size);
2328 } else {
2329 return uncommit_mmaped_memory(addr, size);
2330 }
2331 }
2332
2333 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2334 // Do not call this; no need to commit stack pages on AIX.
2335 ShouldNotReachHere();
2336 return true;
2337 }
2338
2339 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2340 // Do not call this; no need to commit stack pages on AIX.
2341 ShouldNotReachHere();
2342 return true;
2343 }
2344
2345 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2346 }
2347
2348 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2349 }
2350
2351 void os::numa_make_global(char *addr, size_t bytes) {
2352 }
2353
2354 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2355 }
2356
2357 bool os::numa_topology_changed() {
2358 return false;
2359 }
2360
2361 size_t os::numa_get_groups_num() {
2362 return 1;
2363 }
2364
2365 int os::numa_get_group_id() {
2366 return 0;
2367 }
2368
2369 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2370 if (size > 0) {
2371 ids[0] = 0;
2372 return 1;
2373 }
2374 return 0;
2375 }
2376
2377 bool os::get_page_info(char *start, page_info* info) {
2378 return false;
2379 }
2380
2381 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2382 return end;
2383 }
2384
2385 // Reserves and attaches a shared memory segment.
2386 // Will assert if a wish address is given and could not be obtained.
2387 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2388
2389 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2390 // thereby clobbering old mappings at that place. That is probably
2391 // not intended, never used and almost certainly an error were it
2392 // ever be used this way (to try attaching at a specified address
2393 // without clobbering old mappings an alternate API exists,
2394 // os::attempt_reserve_memory_at()).
2395 // Instead of mimicking the dangerous coding of the other platforms, here I
2396 // just ignore the request address (release) or assert(debug).
2397 assert0(requested_addr == NULL);
2398
2399 // Always round to os::vm_page_size(), which may be larger than 4K.
2400 bytes = align_size_up(bytes, os::vm_page_size());
2401 const size_t alignment_hint0 =
2402 alignment_hint ? align_size_up(alignment_hint, os::vm_page_size()) : 0;
2403
2404 // In 4K mode always use mmap.
2405 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2406 if (os::vm_page_size() == SIZE_4K) {
2407 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2408 } else {
2409 if (bytes >= Use64KPagesThreshold) {
2410 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2411 } else {
2412 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2413 }
2414 }
2415 }
2416
2417 bool os::pd_release_memory(char* addr, size_t size) {
2418
2419 // Dynamically do different things for mmap/shmat.
2420 vmembk_t* const vmi = vmembk_find(addr);
2421 assert0(vmi);
2422
2423 // Always round to os::vm_page_size(), which may be larger than 4K.
2424 size = align_size_up(size, os::vm_page_size());
2425 addr = (char *)align_ptr_up(addr, os::vm_page_size());
2426
2427 bool rc = false;
2428 bool remove_bookkeeping = false;
2429 if (vmi->type == VMEM_SHMATED) {
2430 // For shmatted memory, we do:
2431 // - If user wants to release the whole range, release the memory (shmdt).
2432 // - If user only wants to release a partial range, uncommit (disclaim) that
2433 // range. That way, at least, we do not use memory anymore (bust still page
2434 // table space).
2435 vmi->assert_is_valid_subrange(addr, size);
2436 if (addr == vmi->addr && size == vmi->size) {
2437 rc = release_shmated_memory(addr, size);
2438 remove_bookkeeping = true;
2439 } else {
2440 rc = uncommit_shmated_memory(addr, size);
2441 }
2442 } else {
2443 // User may unmap partial regions but region has to be fully contained.
2444 #ifdef ASSERT
2445 vmi->assert_is_valid_subrange(addr, size);
2446 #endif
2447 rc = release_mmaped_memory(addr, size);
2448 remove_bookkeeping = true;
2449 }
2450
2451 // update bookkeeping
2452 if (rc && remove_bookkeeping) {
2453 vmembk_remove(vmi);
2454 }
2455
2456 return rc;
2457 }
2458
2459 static bool checked_mprotect(char* addr, size_t size, int prot) {
2460
2461 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2462 // not tell me if protection failed when trying to protect an un-protectable range.
2463 //
2464 // This means if the memory was allocated using shmget/shmat, protection wont work
2465 // but mprotect will still return 0:
2466 //
2467 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2468
2469 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2470
2471 if (!rc) {
2472 const char* const s_errno = strerror(errno);
2473 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2474 return false;
2475 }
2476
2477 // mprotect success check
2478 //
2479 // Mprotect said it changed the protection but can I believe it?
2480 //
2481 // To be sure I need to check the protection afterwards. Try to
2482 // read from protected memory and check whether that causes a segfault.
2483 //
2484 if (!os::Aix::xpg_sus_mode()) {
2485
2486 if (CanUseSafeFetch32()) {
2487
2488 const bool read_protected =
2489 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2490 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2491
2492 if (prot & PROT_READ) {
2493 rc = !read_protected;
2494 } else {
2495 rc = read_protected;
2496 }
2497 }
2498 }
2499 if (!rc) {
2500 assert(false, "mprotect failed.");
2501 }
2502 return rc;
2503 }
2504
2505 // Set protections specified
2506 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2507 unsigned int p = 0;
2508 switch (prot) {
2509 case MEM_PROT_NONE: p = PROT_NONE; break;
2510 case MEM_PROT_READ: p = PROT_READ; break;
2511 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2512 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2513 default:
2514 ShouldNotReachHere();
2515 }
2516 // is_committed is unused.
2517 return checked_mprotect(addr, size, p);
2518 }
2519
2520 bool os::guard_memory(char* addr, size_t size) {
2521 return checked_mprotect(addr, size, PROT_NONE);
2522 }
2523
2524 bool os::unguard_memory(char* addr, size_t size) {
2525 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2526 }
2527
2528 // Large page support
2529
2530 static size_t _large_page_size = 0;
2531
2532 // Enable large page support if OS allows that.
2533 void os::large_page_init() {
2534 return; // Nothing to do. See query_multipage_support and friends.
2535 }
2536
2537 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2538 // "exec" is passed in but not used. Creating the shared image for
2539 // the code cache doesn't have an SHM_X executable permission to check.
2540 Unimplemented();
2541 return 0;
2542 }
2543
2544 bool os::release_memory_special(char* base, size_t bytes) {
2545 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2546 Unimplemented();
2547 return false;
2548 }
2549
2550 size_t os::large_page_size() {
2551 return _large_page_size;
2552 }
2553
2554 bool os::can_commit_large_page_memory() {
2555 // Does not matter, we do not support huge pages.
2556 return false;
2557 }
2558
2559 bool os::can_execute_large_page_memory() {
2560 // Does not matter, we do not support huge pages.
2561 return false;
2562 }
2563
2564 // Reserve memory at an arbitrary address, only if that area is
2565 // available (and not reserved for something else).
2566 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2567 char* addr = NULL;
2568
2569 // Always round to os::vm_page_size(), which may be larger than 4K.
2570 bytes = align_size_up(bytes, os::vm_page_size());
2571
2572 // In 4K mode always use mmap.
2573 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2574 if (os::vm_page_size() == SIZE_4K) {
2575 return reserve_mmaped_memory(bytes, requested_addr, 0);
2576 } else {
2577 if (bytes >= Use64KPagesThreshold) {
2578 return reserve_shmated_memory(bytes, requested_addr, 0);
2579 } else {
2580 return reserve_mmaped_memory(bytes, requested_addr, 0);
2581 }
2582 }
2583
2584 return addr;
2585 }
2586
2587 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2588 return ::read(fd, buf, nBytes);
2589 }
2590
2591 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2592 return ::pread(fd, buf, nBytes, offset);
2593 }
2594
2595 void os::naked_short_sleep(jlong ms) {
2596 struct timespec req;
2597
2598 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2599 req.tv_sec = 0;
2600 if (ms > 0) {
2601 req.tv_nsec = (ms % 1000) * 1000000;
2602 }
2603 else {
2604 req.tv_nsec = 1;
2605 }
2606
2607 nanosleep(&req, NULL);
2608
2609 return;
2610 }
2611
2612 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2613 void os::infinite_sleep() {
2614 while (true) { // sleep forever ...
2615 ::sleep(100); // ... 100 seconds at a time
2616 }
2617 }
2618
2619 // Used to convert frequent JVM_Yield() to nops
2620 bool os::dont_yield() {
2621 return DontYieldALot;
2622 }
2623
2624 void os::naked_yield() {
2625 sched_yield();
2626 }
2627
2628 ////////////////////////////////////////////////////////////////////////////////
2629 // thread priority support
2630
2631 // From AIX manpage to pthread_setschedparam
2632 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2633 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2634 //
2635 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2636 // range from 40 to 80, where 40 is the least favored priority and 80
2637 // is the most favored."
2638 //
2639 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2640 // scheduling there; however, this still leaves iSeries.)
2641 //
2642 // We use the same values for AIX and PASE.
2643 int os::java_to_os_priority[CriticalPriority + 1] = {
2644 54, // 0 Entry should never be used
2645
2646 55, // 1 MinPriority
2647 55, // 2
2648 56, // 3
2649
2650 56, // 4
2651 57, // 5 NormPriority
2652 57, // 6
2653
2654 58, // 7
2655 58, // 8
2656 59, // 9 NearMaxPriority
2657
2658 60, // 10 MaxPriority
2659
2660 60 // 11 CriticalPriority
2661 };
2662
2663 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2664 if (!UseThreadPriorities) return OS_OK;
2665 pthread_t thr = thread->osthread()->pthread_id();
2666 int policy = SCHED_OTHER;
2667 struct sched_param param;
2668 param.sched_priority = newpri;
2669 int ret = pthread_setschedparam(thr, policy, ¶m);
2670
2671 if (ret != 0) {
2672 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2673 (int)thr, newpri, ret, strerror(ret));
2674 }
2675 return (ret == 0) ? OS_OK : OS_ERR;
2676 }
2677
2678 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2679 if (!UseThreadPriorities) {
2680 *priority_ptr = java_to_os_priority[NormPriority];
2681 return OS_OK;
2682 }
2683 pthread_t thr = thread->osthread()->pthread_id();
2684 int policy = SCHED_OTHER;
2685 struct sched_param param;
2686 int ret = pthread_getschedparam(thr, &policy, ¶m);
2687 *priority_ptr = param.sched_priority;
2688
2689 return (ret == 0) ? OS_OK : OS_ERR;
2690 }
2691
2692 // Hint to the underlying OS that a task switch would not be good.
2693 // Void return because it's a hint and can fail.
2694 void os::hint_no_preempt() {}
2695
2696 ////////////////////////////////////////////////////////////////////////////////
2697 // suspend/resume support
2698
2699 // the low-level signal-based suspend/resume support is a remnant from the
2700 // old VM-suspension that used to be for java-suspension, safepoints etc,
2701 // within hotspot. Now there is a single use-case for this:
2702 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2703 // that runs in the watcher thread.
2704 // The remaining code is greatly simplified from the more general suspension
2705 // code that used to be used.
2706 //
2707 // The protocol is quite simple:
2708 // - suspend:
2709 // - sends a signal to the target thread
2710 // - polls the suspend state of the osthread using a yield loop
2711 // - target thread signal handler (SR_handler) sets suspend state
2712 // and blocks in sigsuspend until continued
2713 // - resume:
2714 // - sets target osthread state to continue
2715 // - sends signal to end the sigsuspend loop in the SR_handler
2716 //
2717 // Note that the SR_lock plays no role in this suspend/resume protocol.
2718 //
2719
2720 static void resume_clear_context(OSThread *osthread) {
2721 osthread->set_ucontext(NULL);
2722 osthread->set_siginfo(NULL);
2723 }
2724
2725 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2726 osthread->set_ucontext(context);
2727 osthread->set_siginfo(siginfo);
2728 }
2729
2730 //
2731 // Handler function invoked when a thread's execution is suspended or
2732 // resumed. We have to be careful that only async-safe functions are
2733 // called here (Note: most pthread functions are not async safe and
2734 // should be avoided.)
2735 //
2736 // Note: sigwait() is a more natural fit than sigsuspend() from an
2737 // interface point of view, but sigwait() prevents the signal hander
2738 // from being run. libpthread would get very confused by not having
2739 // its signal handlers run and prevents sigwait()'s use with the
2740 // mutex granting granting signal.
2741 //
2742 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2743 //
2744 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2745 // Save and restore errno to avoid confusing native code with EINTR
2746 // after sigsuspend.
2747 int old_errno = errno;
2748
2749 Thread* thread = Thread::current();
2750 OSThread* osthread = thread->osthread();
2751 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2752
2753 os::SuspendResume::State current = osthread->sr.state();
2754 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2755 suspend_save_context(osthread, siginfo, context);
2756
2757 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2758 os::SuspendResume::State state = osthread->sr.suspended();
2759 if (state == os::SuspendResume::SR_SUSPENDED) {
2760 sigset_t suspend_set; // signals for sigsuspend()
2761
2762 // get current set of blocked signals and unblock resume signal
2763 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2764 sigdelset(&suspend_set, SR_signum);
2765
2766 // wait here until we are resumed
2767 while (1) {
2768 sigsuspend(&suspend_set);
2769
2770 os::SuspendResume::State result = osthread->sr.running();
2771 if (result == os::SuspendResume::SR_RUNNING) {
2772 break;
2773 }
2774 }
2775
2776 } else if (state == os::SuspendResume::SR_RUNNING) {
2777 // request was cancelled, continue
2778 } else {
2779 ShouldNotReachHere();
2780 }
2781
2782 resume_clear_context(osthread);
2783 } else if (current == os::SuspendResume::SR_RUNNING) {
2784 // request was cancelled, continue
2785 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2786 // ignore
2787 } else {
2788 ShouldNotReachHere();
2789 }
2790
2791 errno = old_errno;
2792 }
2793
2794 static int SR_initialize() {
2795 struct sigaction act;
2796 char *s;
2797 // Get signal number to use for suspend/resume
2798 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2799 int sig = ::strtol(s, 0, 10);
2800 if (sig > 0 || sig < NSIG) {
2801 SR_signum = sig;
2802 }
2803 }
2804
2805 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2806 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2807
2808 sigemptyset(&SR_sigset);
2809 sigaddset(&SR_sigset, SR_signum);
2810
2811 // Set up signal handler for suspend/resume.
2812 act.sa_flags = SA_RESTART|SA_SIGINFO;
2813 act.sa_handler = (void (*)(int)) SR_handler;
2814
2815 // SR_signum is blocked by default.
2816 // 4528190 - We also need to block pthread restart signal (32 on all
2817 // supported Linux platforms). Note that LinuxThreads need to block
2818 // this signal for all threads to work properly. So we don't have
2819 // to use hard-coded signal number when setting up the mask.
2820 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2821
2822 if (sigaction(SR_signum, &act, 0) == -1) {
2823 return -1;
2824 }
2825
2826 // Save signal flag
2827 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2828 return 0;
2829 }
2830
2831 static int SR_finalize() {
2832 return 0;
2833 }
2834
2835 static int sr_notify(OSThread* osthread) {
2836 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2837 assert_status(status == 0, status, "pthread_kill");
2838 return status;
2839 }
2840
2841 // "Randomly" selected value for how long we want to spin
2842 // before bailing out on suspending a thread, also how often
2843 // we send a signal to a thread we want to resume
2844 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2845 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2846
2847 // returns true on success and false on error - really an error is fatal
2848 // but this seems the normal response to library errors
2849 static bool do_suspend(OSThread* osthread) {
2850 assert(osthread->sr.is_running(), "thread should be running");
2851 // mark as suspended and send signal
2852
2853 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2854 // failed to switch, state wasn't running?
2855 ShouldNotReachHere();
2856 return false;
2857 }
2858
2859 if (sr_notify(osthread) != 0) {
2860 // try to cancel, switch to running
2861
2862 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2863 if (result == os::SuspendResume::SR_RUNNING) {
2864 // cancelled
2865 return false;
2866 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2867 // somehow managed to suspend
2868 return true;
2869 } else {
2870 ShouldNotReachHere();
2871 return false;
2872 }
2873 }
2874
2875 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2876
2877 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2878 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2879 os::naked_yield();
2880 }
2881
2882 // timeout, try to cancel the request
2883 if (n >= RANDOMLY_LARGE_INTEGER) {
2884 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2885 if (cancelled == os::SuspendResume::SR_RUNNING) {
2886 return false;
2887 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2888 return true;
2889 } else {
2890 ShouldNotReachHere();
2891 return false;
2892 }
2893 }
2894 }
2895
2896 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2897 return true;
2898 }
2899
2900 static void do_resume(OSThread* osthread) {
2901 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2902
2903 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2904 // failed to switch to WAKEUP_REQUEST
2905 ShouldNotReachHere();
2906 return;
2907 }
2908
2909 while (!osthread->sr.is_running()) {
2910 if (sr_notify(osthread) == 0) {
2911 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2912 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2913 os::naked_yield();
2914 }
2915 }
2916 } else {
2917 ShouldNotReachHere();
2918 }
2919 }
2920
2921 guarantee(osthread->sr.is_running(), "Must be running!");
2922 }
2923
2924 ///////////////////////////////////////////////////////////////////////////////////
2925 // signal handling (except suspend/resume)
2926
2927 // This routine may be used by user applications as a "hook" to catch signals.
2928 // The user-defined signal handler must pass unrecognized signals to this
2929 // routine, and if it returns true (non-zero), then the signal handler must
2930 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2931 // routine will never retun false (zero), but instead will execute a VM panic
2932 // routine kill the process.
2933 //
2934 // If this routine returns false, it is OK to call it again. This allows
2935 // the user-defined signal handler to perform checks either before or after
2936 // the VM performs its own checks. Naturally, the user code would be making
2937 // a serious error if it tried to handle an exception (such as a null check
2938 // or breakpoint) that the VM was generating for its own correct operation.
2939 //
2940 // This routine may recognize any of the following kinds of signals:
2941 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2942 // It should be consulted by handlers for any of those signals.
2943 //
2944 // The caller of this routine must pass in the three arguments supplied
2945 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2946 // field of the structure passed to sigaction(). This routine assumes that
2947 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2948 //
2949 // Note that the VM will print warnings if it detects conflicting signal
2950 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2951 //
2952 extern "C" JNIEXPORT int
2953 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2954
2955 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2956 // to be the thing to call; documentation is not terribly clear about whether
2957 // pthread_sigmask also works, and if it does, whether it does the same.
2958 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2959 const int rc = ::pthread_sigmask(how, set, oset);
2960 // return value semantics differ slightly for error case:
2961 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2962 // (so, pthread_sigmask is more theadsafe for error handling)
2963 // But success is always 0.
2964 return rc == 0 ? true : false;
2965 }
2966
2967 // Function to unblock all signals which are, according
2968 // to POSIX, typical program error signals. If they happen while being blocked,
2969 // they typically will bring down the process immediately.
2970 bool unblock_program_error_signals() {
2971 sigset_t set;
2972 ::sigemptyset(&set);
2973 ::sigaddset(&set, SIGILL);
2974 ::sigaddset(&set, SIGBUS);
2975 ::sigaddset(&set, SIGFPE);
2976 ::sigaddset(&set, SIGSEGV);
2977 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2978 }
2979
2980 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2981 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2982 assert(info != NULL && uc != NULL, "it must be old kernel");
2983
2984 // Never leave program error signals blocked;
2985 // on all our platforms they would bring down the process immediately when
2986 // getting raised while being blocked.
2987 unblock_program_error_signals();
2988
2989 JVM_handle_aix_signal(sig, info, uc, true);
2990 }
2991
2992 // This boolean allows users to forward their own non-matching signals
2993 // to JVM_handle_aix_signal, harmlessly.
2994 bool os::Aix::signal_handlers_are_installed = false;
2995
2996 // For signal-chaining
2997 struct sigaction os::Aix::sigact[MAXSIGNUM];
2998 unsigned int os::Aix::sigs = 0;
2999 bool os::Aix::libjsig_is_loaded = false;
3000 typedef struct sigaction *(*get_signal_t)(int);
3001 get_signal_t os::Aix::get_signal_action = NULL;
3002
3003 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3004 struct sigaction *actp = NULL;
3005
3006 if (libjsig_is_loaded) {
3007 // Retrieve the old signal handler from libjsig
3008 actp = (*get_signal_action)(sig);
3009 }
3010 if (actp == NULL) {
3011 // Retrieve the preinstalled signal handler from jvm
3012 actp = get_preinstalled_handler(sig);
3013 }
3014
3015 return actp;
3016 }
3017
3018 static bool call_chained_handler(struct sigaction *actp, int sig,
3019 siginfo_t *siginfo, void *context) {
3020 // Call the old signal handler
3021 if (actp->sa_handler == SIG_DFL) {
3022 // It's more reasonable to let jvm treat it as an unexpected exception
3023 // instead of taking the default action.
3024 return false;
3025 } else if (actp->sa_handler != SIG_IGN) {
3026 if ((actp->sa_flags & SA_NODEFER) == 0) {
3027 // automaticlly block the signal
3028 sigaddset(&(actp->sa_mask), sig);
3029 }
3030
3031 sa_handler_t hand = NULL;
3032 sa_sigaction_t sa = NULL;
3033 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3034 // retrieve the chained handler
3035 if (siginfo_flag_set) {
3036 sa = actp->sa_sigaction;
3037 } else {
3038 hand = actp->sa_handler;
3039 }
3040
3041 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3042 actp->sa_handler = SIG_DFL;
3043 }
3044
3045 // try to honor the signal mask
3046 sigset_t oset;
3047 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3048
3049 // call into the chained handler
3050 if (siginfo_flag_set) {
3051 (*sa)(sig, siginfo, context);
3052 } else {
3053 (*hand)(sig);
3054 }
3055
3056 // restore the signal mask
3057 pthread_sigmask(SIG_SETMASK, &oset, 0);
3058 }
3059 // Tell jvm's signal handler the signal is taken care of.
3060 return true;
3061 }
3062
3063 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3064 bool chained = false;
3065 // signal-chaining
3066 if (UseSignalChaining) {
3067 struct sigaction *actp = get_chained_signal_action(sig);
3068 if (actp != NULL) {
3069 chained = call_chained_handler(actp, sig, siginfo, context);
3070 }
3071 }
3072 return chained;
3073 }
3074
3075 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3076 if ((((unsigned int)1 << sig) & sigs) != 0) {
3077 return &sigact[sig];
3078 }
3079 return NULL;
3080 }
3081
3082 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3083 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3084 sigact[sig] = oldAct;
3085 sigs |= (unsigned int)1 << sig;
3086 }
3087
3088 // for diagnostic
3089 int os::Aix::sigflags[MAXSIGNUM];
3090
3091 int os::Aix::get_our_sigflags(int sig) {
3092 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3093 return sigflags[sig];
3094 }
3095
3096 void os::Aix::set_our_sigflags(int sig, int flags) {
3097 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3098 sigflags[sig] = flags;
3099 }
3100
3101 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3102 // Check for overwrite.
3103 struct sigaction oldAct;
3104 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3105
3106 void* oldhand = oldAct.sa_sigaction
3107 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3108 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3109 // Renamed 'signalHandler' to avoid collision with other shared libs.
3110 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3111 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3112 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3113 if (AllowUserSignalHandlers || !set_installed) {
3114 // Do not overwrite; user takes responsibility to forward to us.
3115 return;
3116 } else if (UseSignalChaining) {
3117 // save the old handler in jvm
3118 save_preinstalled_handler(sig, oldAct);
3119 // libjsig also interposes the sigaction() call below and saves the
3120 // old sigaction on it own.
3121 } else {
3122 fatal("Encountered unexpected pre-existing sigaction handler "
3123 "%#lx for signal %d.", (long)oldhand, sig);
3124 }
3125 }
3126
3127 struct sigaction sigAct;
3128 sigfillset(&(sigAct.sa_mask));
3129 if (!set_installed) {
3130 sigAct.sa_handler = SIG_DFL;
3131 sigAct.sa_flags = SA_RESTART;
3132 } else {
3133 // Renamed 'signalHandler' to avoid collision with other shared libs.
3134 sigAct.sa_sigaction = javaSignalHandler;
3135 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3136 }
3137 // Save flags, which are set by ours
3138 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3139 sigflags[sig] = sigAct.sa_flags;
3140
3141 int ret = sigaction(sig, &sigAct, &oldAct);
3142 assert(ret == 0, "check");
3143
3144 void* oldhand2 = oldAct.sa_sigaction
3145 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3146 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3147 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3148 }
3149
3150 // install signal handlers for signals that HotSpot needs to
3151 // handle in order to support Java-level exception handling.
3152 void os::Aix::install_signal_handlers() {
3153 if (!signal_handlers_are_installed) {
3154 signal_handlers_are_installed = true;
3155
3156 // signal-chaining
3157 typedef void (*signal_setting_t)();
3158 signal_setting_t begin_signal_setting = NULL;
3159 signal_setting_t end_signal_setting = NULL;
3160 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3161 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3162 if (begin_signal_setting != NULL) {
3163 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3164 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3165 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3166 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3167 libjsig_is_loaded = true;
3168 assert(UseSignalChaining, "should enable signal-chaining");
3169 }
3170 if (libjsig_is_loaded) {
3171 // Tell libjsig jvm is setting signal handlers
3172 (*begin_signal_setting)();
3173 }
3174
3175 set_signal_handler(SIGSEGV, true);
3176 set_signal_handler(SIGPIPE, true);
3177 set_signal_handler(SIGBUS, true);
3178 set_signal_handler(SIGILL, true);
3179 set_signal_handler(SIGFPE, true);
3180 set_signal_handler(SIGTRAP, true);
3181 set_signal_handler(SIGXFSZ, true);
3182 set_signal_handler(SIGDANGER, true);
3183
3184 if (libjsig_is_loaded) {
3185 // Tell libjsig jvm finishes setting signal handlers.
3186 (*end_signal_setting)();
3187 }
3188
3189 // We don't activate signal checker if libjsig is in place, we trust ourselves
3190 // and if UserSignalHandler is installed all bets are off.
3191 // Log that signal checking is off only if -verbose:jni is specified.
3192 if (CheckJNICalls) {
3193 if (libjsig_is_loaded) {
3194 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3195 check_signals = false;
3196 }
3197 if (AllowUserSignalHandlers) {
3198 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3199 check_signals = false;
3200 }
3201 // Need to initialize check_signal_done.
3202 ::sigemptyset(&check_signal_done);
3203 }
3204 }
3205 }
3206
3207 static const char* get_signal_handler_name(address handler,
3208 char* buf, int buflen) {
3209 int offset;
3210 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3211 if (found) {
3212 // skip directory names
3213 const char *p1, *p2;
3214 p1 = buf;
3215 size_t len = strlen(os::file_separator());
3216 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3217 // The way os::dll_address_to_library_name is implemented on Aix
3218 // right now, it always returns -1 for the offset which is not
3219 // terribly informative.
3220 // Will fix that. For now, omit the offset.
3221 jio_snprintf(buf, buflen, "%s", p1);
3222 } else {
3223 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3224 }
3225 return buf;
3226 }
3227
3228 static void print_signal_handler(outputStream* st, int sig,
3229 char* buf, size_t buflen) {
3230 struct sigaction sa;
3231 sigaction(sig, NULL, &sa);
3232
3233 st->print("%s: ", os::exception_name(sig, buf, buflen));
3234
3235 address handler = (sa.sa_flags & SA_SIGINFO)
3236 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3237 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3238
3239 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3240 st->print("SIG_DFL");
3241 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3242 st->print("SIG_IGN");
3243 } else {
3244 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3245 }
3246
3247 // Print readable mask.
3248 st->print(", sa_mask[0]=");
3249 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3250
3251 address rh = VMError::get_resetted_sighandler(sig);
3252 // May be, handler was resetted by VMError?
3253 if (rh != NULL) {
3254 handler = rh;
3255 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3256 }
3257
3258 // Print textual representation of sa_flags.
3259 st->print(", sa_flags=");
3260 os::Posix::print_sa_flags(st, sa.sa_flags);
3261
3262 // Check: is it our handler?
3263 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3264 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3265 // It is our signal handler.
3266 // Check for flags, reset system-used one!
3267 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3268 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3269 os::Aix::get_our_sigflags(sig));
3270 }
3271 }
3272 st->cr();
3273 }
3274
3275 #define DO_SIGNAL_CHECK(sig) \
3276 if (!sigismember(&check_signal_done, sig)) \
3277 os::Aix::check_signal_handler(sig)
3278
3279 // This method is a periodic task to check for misbehaving JNI applications
3280 // under CheckJNI, we can add any periodic checks here
3281
3282 void os::run_periodic_checks() {
3283
3284 if (check_signals == false) return;
3285
3286 // SEGV and BUS if overridden could potentially prevent
3287 // generation of hs*.log in the event of a crash, debugging
3288 // such a case can be very challenging, so we absolutely
3289 // check the following for a good measure:
3290 DO_SIGNAL_CHECK(SIGSEGV);
3291 DO_SIGNAL_CHECK(SIGILL);
3292 DO_SIGNAL_CHECK(SIGFPE);
3293 DO_SIGNAL_CHECK(SIGBUS);
3294 DO_SIGNAL_CHECK(SIGPIPE);
3295 DO_SIGNAL_CHECK(SIGXFSZ);
3296 if (UseSIGTRAP) {
3297 DO_SIGNAL_CHECK(SIGTRAP);
3298 }
3299 DO_SIGNAL_CHECK(SIGDANGER);
3300
3301 // ReduceSignalUsage allows the user to override these handlers
3302 // see comments at the very top and jvm_solaris.h
3303 if (!ReduceSignalUsage) {
3304 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3305 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3306 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3307 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3308 }
3309
3310 DO_SIGNAL_CHECK(SR_signum);
3311 }
3312
3313 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3314
3315 static os_sigaction_t os_sigaction = NULL;
3316
3317 void os::Aix::check_signal_handler(int sig) {
3318 char buf[O_BUFLEN];
3319 address jvmHandler = NULL;
3320
3321 struct sigaction act;
3322 if (os_sigaction == NULL) {
3323 // only trust the default sigaction, in case it has been interposed
3324 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3325 if (os_sigaction == NULL) return;
3326 }
3327
3328 os_sigaction(sig, (struct sigaction*)NULL, &act);
3329
3330 address thisHandler = (act.sa_flags & SA_SIGINFO)
3331 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3332 : CAST_FROM_FN_PTR(address, act.sa_handler);
3333
3334 switch(sig) {
3335 case SIGSEGV:
3336 case SIGBUS:
3337 case SIGFPE:
3338 case SIGPIPE:
3339 case SIGILL:
3340 case SIGXFSZ:
3341 // Renamed 'signalHandler' to avoid collision with other shared libs.
3342 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3343 break;
3344
3345 case SHUTDOWN1_SIGNAL:
3346 case SHUTDOWN2_SIGNAL:
3347 case SHUTDOWN3_SIGNAL:
3348 case BREAK_SIGNAL:
3349 jvmHandler = (address)user_handler();
3350 break;
3351
3352 default:
3353 if (sig == SR_signum) {
3354 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3355 } else {
3356 return;
3357 }
3358 break;
3359 }
3360
3361 if (thisHandler != jvmHandler) {
3362 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3363 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3364 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3365 // No need to check this sig any longer
3366 sigaddset(&check_signal_done, sig);
3367 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3368 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3369 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3370 exception_name(sig, buf, O_BUFLEN));
3371 }
3372 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3373 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3374 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3375 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3376 // No need to check this sig any longer
3377 sigaddset(&check_signal_done, sig);
3378 }
3379
3380 // Dump all the signal
3381 if (sigismember(&check_signal_done, sig)) {
3382 print_signal_handlers(tty, buf, O_BUFLEN);
3383 }
3384 }
3385
3386 extern bool signal_name(int signo, char* buf, size_t len);
3387
3388 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3389 if (0 < exception_code && exception_code <= SIGRTMAX) {
3390 // signal
3391 if (!signal_name(exception_code, buf, size)) {
3392 jio_snprintf(buf, size, "SIG%d", exception_code);
3393 }
3394 return buf;
3395 } else {
3396 return NULL;
3397 }
3398 }
3399
3400 // To install functions for atexit system call
3401 extern "C" {
3402 static void perfMemory_exit_helper() {
3403 perfMemory_exit();
3404 }
3405 }
3406
3407 // This is called _before_ the most of global arguments have been parsed.
3408 void os::init(void) {
3409 // This is basic, we want to know if that ever changes.
3410 // (Shared memory boundary is supposed to be a 256M aligned.)
3411 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3412
3413 // First off, we need to know whether we run on AIX or PASE, and
3414 // the OS level we run on.
3415 os::Aix::initialize_os_info();
3416
3417 // Scan environment (SPEC1170 behaviour, etc).
3418 os::Aix::scan_environment();
3419
3420 // Check which pages are supported by AIX.
3421 query_multipage_support();
3422
3423 // Act like we only have one page size by eliminating corner cases which
3424 // we did not support very well anyway.
3425 // We have two input conditions:
3426 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3427 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3428 // setting.
3429 // Data segment page size is important for us because it defines the thread stack page
3430 // size, which is needed for guard page handling, stack banging etc.
3431 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3432 // and should be allocated with 64k pages.
3433 //
3434 // So, we do the following:
3435 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3436 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3437 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3438 // 64k no --- AIX 5.2 ? ---
3439 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3440
3441 // We explicitly leave no option to change page size, because only upgrading would work,
3442 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3443
3444 if (g_multipage_support.datapsize == SIZE_4K) {
3445 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3446 if (g_multipage_support.can_use_64K_pages) {
3447 // .. but we are able to use 64K pages dynamically.
3448 // This would be typical for java launchers which are not linked
3449 // with datapsize=64K (like, any other launcher but our own).
3450 //
3451 // In this case it would be smart to allocate the java heap with 64K
3452 // to get the performance benefit, and to fake 64k pages for the
3453 // data segment (when dealing with thread stacks).
3454 //
3455 // However, leave a possibility to downgrade to 4K, using
3456 // -XX:-Use64KPages.
3457 if (Use64KPages) {
3458 trcVerbose("64K page mode (faked for data segment)");
3459 Aix::_page_size = SIZE_64K;
3460 } else {
3461 trcVerbose("4K page mode (Use64KPages=off)");
3462 Aix::_page_size = SIZE_4K;
3463 }
3464 } else {
3465 // .. and not able to allocate 64k pages dynamically. Here, just
3466 // fall back to 4K paged mode and use mmap for everything.
3467 trcVerbose("4K page mode");
3468 Aix::_page_size = SIZE_4K;
3469 FLAG_SET_ERGO(bool, Use64KPages, false);
3470 }
3471 } else {
3472 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3473 // This normally means that we can allocate 64k pages dynamically.
3474 // (There is one special case where this may be false: EXTSHM=on.
3475 // but we decided to not support that mode).
3476 assert0(g_multipage_support.can_use_64K_pages);
3477 Aix::_page_size = SIZE_64K;
3478 trcVerbose("64K page mode");
3479 FLAG_SET_ERGO(bool, Use64KPages, true);
3480 }
3481
3482 // Short-wire stack page size to base page size; if that works, we just remove
3483 // that stack page size altogether.
3484 Aix::_stack_page_size = Aix::_page_size;
3485
3486 // For now UseLargePages is just ignored.
3487 FLAG_SET_ERGO(bool, UseLargePages, false);
3488 _page_sizes[0] = 0;
3489
3490 // debug trace
3491 trcVerbose("os::vm_page_size %s\n", describe_pagesize(os::vm_page_size()));
3492
3493 // Next, we need to initialize libo4 and libperfstat libraries.
3494 if (os::Aix::on_pase()) {
3495 os::Aix::initialize_libo4();
3496 } else {
3497 os::Aix::initialize_libperfstat();
3498 }
3499
3500 // Reset the perfstat information provided by ODM.
3501 if (os::Aix::on_aix()) {
3502 libperfstat::perfstat_reset();
3503 }
3504
3505 // Now initialze basic system properties. Note that for some of the values we
3506 // need libperfstat etc.
3507 os::Aix::initialize_system_info();
3508
3509 _initial_pid = getpid();
3510
3511 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3512
3513 init_random(1234567);
3514
3515 ThreadCritical::initialize();
3516
3517 // Main_thread points to the aboriginal thread.
3518 Aix::_main_thread = pthread_self();
3519
3520 initial_time_count = os::elapsed_counter();
3521
3522 // If the pagesize of the VM is greater than 8K determine the appropriate
3523 // number of initial guard pages. The user can change this with the
3524 // command line arguments, if needed.
3525 if (vm_page_size() > (int)Aix::vm_default_page_size()) {
3526 StackYellowPages = 1;
3527 StackRedPages = 1;
3528 StackShadowPages = round_to((StackShadowPages*Aix::vm_default_page_size()), vm_page_size()) / vm_page_size();
3529 }
3530 }
3531
3532 // This is called _after_ the global arguments have been parsed.
3533 jint os::init_2(void) {
3534
3535 trcVerbose("processor count: %d", os::_processor_count);
3536 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3537
3538 // Initially build up the loaded dll map.
3539 LoadedLibraries::reload();
3540
3541 const int page_size = Aix::page_size();
3542 const int map_size = page_size;
3543
3544 address map_address = (address) MAP_FAILED;
3545 const int prot = PROT_READ;
3546 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3547
3548 // Use optimized addresses for the polling page,
3549 // e.g. map it to a special 32-bit address.
3550 if (OptimizePollingPageLocation) {
3551 // architecture-specific list of address wishes:
3552 address address_wishes[] = {
3553 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3554 // PPC64: all address wishes are non-negative 32 bit values where
3555 // the lower 16 bits are all zero. we can load these addresses
3556 // with a single ppc_lis instruction.
3557 (address) 0x30000000, (address) 0x31000000,
3558 (address) 0x32000000, (address) 0x33000000,
3559 (address) 0x40000000, (address) 0x41000000,
3560 (address) 0x42000000, (address) 0x43000000,
3561 (address) 0x50000000, (address) 0x51000000,
3562 (address) 0x52000000, (address) 0x53000000,
3563 (address) 0x60000000, (address) 0x61000000,
3564 (address) 0x62000000, (address) 0x63000000
3565 };
3566 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3567
3568 // iterate over the list of address wishes:
3569 for (int i=0; i<address_wishes_length; i++) {
3570 // Try to map with current address wish.
3571 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3572 // fail if the address is already mapped.
3573 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3574 map_size, prot,
3575 flags | MAP_FIXED,
3576 -1, 0);
3577 if (Verbose) {
3578 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3579 address_wishes[i], map_address + (ssize_t)page_size);
3580 }
3581
3582 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3583 // Map succeeded and map_address is at wished address, exit loop.
3584 break;
3585 }
3586
3587 if (map_address != (address) MAP_FAILED) {
3588 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3589 ::munmap(map_address, map_size);
3590 map_address = (address) MAP_FAILED;
3591 }
3592 // Map failed, continue loop.
3593 }
3594 } // end OptimizePollingPageLocation
3595
3596 if (map_address == (address) MAP_FAILED) {
3597 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3598 }
3599 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3600 os::set_polling_page(map_address);
3601
3602 if (!UseMembar) {
3603 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3604 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3605 os::set_memory_serialize_page(mem_serialize_page);
3606
3607 #ifndef PRODUCT
3608 if (Verbose && PrintMiscellaneous) {
3609 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3610 }
3611 #endif
3612 }
3613
3614 // initialize suspend/resume support - must do this before signal_sets_init()
3615 if (SR_initialize() != 0) {
3616 perror("SR_initialize failed");
3617 return JNI_ERR;
3618 }
3619
3620 Aix::signal_sets_init();
3621 Aix::install_signal_handlers();
3622
3623 // Check minimum allowable stack size for thread creation and to initialize
3624 // the java system classes, including StackOverflowError - depends on page
3625 // size. Add a page for compiler2 recursion in main thread.
3626 // Add in 2*BytesPerWord times page size to account for VM stack during
3627 // class initialization depending on 32 or 64 bit VM.
3628 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3629 (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Aix::page_size() +
3630 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::vm_default_page_size());
3631
3632 os::Aix::min_stack_allowed = align_size_up(os::Aix::min_stack_allowed, os::Aix::page_size());
3633
3634 size_t threadStackSizeInBytes = ThreadStackSize * K;
3635 if (threadStackSizeInBytes != 0 &&
3636 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3637 tty->print_cr("\nThe stack size specified is too small, "
3638 "Specify at least %dk",
3639 os::Aix::min_stack_allowed / K);
3640 return JNI_ERR;
3641 }
3642
3643 // Make the stack size a multiple of the page size so that
3644 // the yellow/red zones can be guarded.
3645 // Note that this can be 0, if no default stacksize was set.
3646 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3647
3648 Aix::libpthread_init();
3649
3650 if (MaxFDLimit) {
3651 // Set the number of file descriptors to max. print out error
3652 // if getrlimit/setrlimit fails but continue regardless.
3653 struct rlimit nbr_files;
3654 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3655 if (status != 0) {
3656 if (PrintMiscellaneous && (Verbose || WizardMode))
3657 perror("os::init_2 getrlimit failed");
3658 } else {
3659 nbr_files.rlim_cur = nbr_files.rlim_max;
3660 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3661 if (status != 0) {
3662 if (PrintMiscellaneous && (Verbose || WizardMode))
3663 perror("os::init_2 setrlimit failed");
3664 }
3665 }
3666 }
3667
3668 if (PerfAllowAtExitRegistration) {
3669 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3670 // Atexit functions can be delayed until process exit time, which
3671 // can be problematic for embedded VM situations. Embedded VMs should
3672 // call DestroyJavaVM() to assure that VM resources are released.
3673
3674 // Note: perfMemory_exit_helper atexit function may be removed in
3675 // the future if the appropriate cleanup code can be added to the
3676 // VM_Exit VMOperation's doit method.
3677 if (atexit(perfMemory_exit_helper) != 0) {
3678 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3679 }
3680 }
3681
3682 return JNI_OK;
3683 }
3684
3685 // Mark the polling page as unreadable
3686 void os::make_polling_page_unreadable(void) {
3687 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3688 fatal("Could not disable polling page");
3689 }
3690 };
3691
3692 // Mark the polling page as readable
3693 void os::make_polling_page_readable(void) {
3694 // Changed according to os_linux.cpp.
3695 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3696 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3697 }
3698 };
3699
3700 int os::active_processor_count() {
3701 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3702 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3703 return online_cpus;
3704 }
3705
3706 void os::set_native_thread_name(const char *name) {
3707 // Not yet implemented.
3708 return;
3709 }
3710
3711 bool os::distribute_processes(uint length, uint* distribution) {
3712 // Not yet implemented.
3713 return false;
3714 }
3715
3716 bool os::bind_to_processor(uint processor_id) {
3717 // Not yet implemented.
3718 return false;
3719 }
3720
3721 void os::SuspendedThreadTask::internal_do_task() {
3722 if (do_suspend(_thread->osthread())) {
3723 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3724 do_task(context);
3725 do_resume(_thread->osthread());
3726 }
3727 }
3728
3729 class PcFetcher : public os::SuspendedThreadTask {
3730 public:
3731 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3732 ExtendedPC result();
3733 protected:
3734 void do_task(const os::SuspendedThreadTaskContext& context);
3735 private:
3736 ExtendedPC _epc;
3737 };
3738
3739 ExtendedPC PcFetcher::result() {
3740 guarantee(is_done(), "task is not done yet.");
3741 return _epc;
3742 }
3743
3744 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3745 Thread* thread = context.thread();
3746 OSThread* osthread = thread->osthread();
3747 if (osthread->ucontext() != NULL) {
3748 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3749 } else {
3750 // NULL context is unexpected, double-check this is the VMThread.
3751 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3752 }
3753 }
3754
3755 // Suspends the target using the signal mechanism and then grabs the PC before
3756 // resuming the target. Used by the flat-profiler only
3757 ExtendedPC os::get_thread_pc(Thread* thread) {
3758 // Make sure that it is called by the watcher for the VMThread.
3759 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3760 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3761
3762 PcFetcher fetcher(thread);
3763 fetcher.run();
3764 return fetcher.result();
3765 }
3766
3767 ////////////////////////////////////////////////////////////////////////////////
3768 // debug support
3769
3770 static address same_page(address x, address y) {
3771 intptr_t page_bits = -os::vm_page_size();
3772 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3773 return x;
3774 else if (x > y)
3775 return (address)(intptr_t(y) | ~page_bits) + 1;
3776 else
3777 return (address)(intptr_t(y) & page_bits);
3778 }
3779
3780 bool os::find(address addr, outputStream* st) {
3781
3782 st->print(PTR_FORMAT ": ", addr);
3783
3784 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3785 if (lib) {
3786 lib->print(st);
3787 return true;
3788 } else {
3789 lib = LoadedLibraries::find_for_data_address(addr);
3790 if (lib) {
3791 lib->print(st);
3792 return true;
3793 } else {
3794 st->print_cr("(outside any module)");
3795 }
3796 }
3797
3798 return false;
3799 }
3800
3801 ////////////////////////////////////////////////////////////////////////////////
3802 // misc
3803
3804 // This does not do anything on Aix. This is basically a hook for being
3805 // able to use structured exception handling (thread-local exception filters)
3806 // on, e.g., Win32.
3807 void
3808 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3809 JavaCallArguments* args, Thread* thread) {
3810 f(value, method, args, thread);
3811 }
3812
3813 void os::print_statistics() {
3814 }
3815
3816 int os::message_box(const char* title, const char* message) {
3817 int i;
3818 fdStream err(defaultStream::error_fd());
3819 for (i = 0; i < 78; i++) err.print_raw("=");
3820 err.cr();
3821 err.print_raw_cr(title);
3822 for (i = 0; i < 78; i++) err.print_raw("-");
3823 err.cr();
3824 err.print_raw_cr(message);
3825 for (i = 0; i < 78; i++) err.print_raw("=");
3826 err.cr();
3827
3828 char buf[16];
3829 // Prevent process from exiting upon "read error" without consuming all CPU
3830 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3831
3832 return buf[0] == 'y' || buf[0] == 'Y';
3833 }
3834
3835 int os::stat(const char *path, struct stat *sbuf) {
3836 char pathbuf[MAX_PATH];
3837 if (strlen(path) > MAX_PATH - 1) {
3838 errno = ENAMETOOLONG;
3839 return -1;
3840 }
3841 os::native_path(strcpy(pathbuf, path));
3842 return ::stat(pathbuf, sbuf);
3843 }
3844
3845 bool os::check_heap(bool force) {
3846 return true;
3847 }
3848
3849 // Is a (classpath) directory empty?
3850 bool os::dir_is_empty(const char* path) {
3851 DIR *dir = NULL;
3852 struct dirent *ptr;
3853
3854 dir = opendir(path);
3855 if (dir == NULL) return true;
3856
3857 /* Scan the directory */
3858 bool result = true;
3859 char buf[sizeof(struct dirent) + MAX_PATH];
3860 while (result && (ptr = ::readdir(dir)) != NULL) {
3861 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3862 result = false;
3863 }
3864 }
3865 closedir(dir);
3866 return result;
3867 }
3868
3869 // This code originates from JDK's sysOpen and open64_w
3870 // from src/solaris/hpi/src/system_md.c
3871
3872 int os::open(const char *path, int oflag, int mode) {
3873
3874 if (strlen(path) > MAX_PATH - 1) {
3875 errno = ENAMETOOLONG;
3876 return -1;
3877 }
3878 int fd;
3879
3880 fd = ::open64(path, oflag, mode);
3881 if (fd == -1) return -1;
3882
3883 // If the open succeeded, the file might still be a directory.
3884 {
3885 struct stat64 buf64;
3886 int ret = ::fstat64(fd, &buf64);
3887 int st_mode = buf64.st_mode;
3888
3889 if (ret != -1) {
3890 if ((st_mode & S_IFMT) == S_IFDIR) {
3891 errno = EISDIR;
3892 ::close(fd);
3893 return -1;
3894 }
3895 } else {
3896 ::close(fd);
3897 return -1;
3898 }
3899 }
3900
3901 // All file descriptors that are opened in the JVM and not
3902 // specifically destined for a subprocess should have the
3903 // close-on-exec flag set. If we don't set it, then careless 3rd
3904 // party native code might fork and exec without closing all
3905 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3906 // UNIXProcess.c), and this in turn might:
3907 //
3908 // - cause end-of-file to fail to be detected on some file
3909 // descriptors, resulting in mysterious hangs, or
3910 //
3911 // - might cause an fopen in the subprocess to fail on a system
3912 // suffering from bug 1085341.
3913 //
3914 // (Yes, the default setting of the close-on-exec flag is a Unix
3915 // design flaw.)
3916 //
3917 // See:
3918 // 1085341: 32-bit stdio routines should support file descriptors >255
3919 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3920 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3921 #ifdef FD_CLOEXEC
3922 {
3923 int flags = ::fcntl(fd, F_GETFD);
3924 if (flags != -1)
3925 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3926 }
3927 #endif
3928
3929 return fd;
3930 }
3931
3932 // create binary file, rewriting existing file if required
3933 int os::create_binary_file(const char* path, bool rewrite_existing) {
3934 int oflags = O_WRONLY | O_CREAT;
3935 if (!rewrite_existing) {
3936 oflags |= O_EXCL;
3937 }
3938 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3939 }
3940
3941 // return current position of file pointer
3942 jlong os::current_file_offset(int fd) {
3943 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3944 }
3945
3946 // move file pointer to the specified offset
3947 jlong os::seek_to_file_offset(int fd, jlong offset) {
3948 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3949 }
3950
3951 // This code originates from JDK's sysAvailable
3952 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3953
3954 int os::available(int fd, jlong *bytes) {
3955 jlong cur, end;
3956 int mode;
3957 struct stat64 buf64;
3958
3959 if (::fstat64(fd, &buf64) >= 0) {
3960 mode = buf64.st_mode;
3961 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3962 int n;
3963 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3964 *bytes = n;
3965 return 1;
3966 }
3967 }
3968 }
3969 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3970 return 0;
3971 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3972 return 0;
3973 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3974 return 0;
3975 }
3976 *bytes = end - cur;
3977 return 1;
3978 }
3979
3980 // Map a block of memory.
3981 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3982 char *addr, size_t bytes, bool read_only,
3983 bool allow_exec) {
3984 int prot;
3985 int flags = MAP_PRIVATE;
3986
3987 if (read_only) {
3988 prot = PROT_READ;
3989 flags = MAP_SHARED;
3990 } else {
3991 prot = PROT_READ | PROT_WRITE;
3992 flags = MAP_PRIVATE;
3993 }
3994
3995 if (allow_exec) {
3996 prot |= PROT_EXEC;
3997 }
3998
3999 if (addr != NULL) {
4000 flags |= MAP_FIXED;
4001 }
4002
4003 // Allow anonymous mappings if 'fd' is -1.
4004 if (fd == -1) {
4005 flags |= MAP_ANONYMOUS;
4006 }
4007
4008 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
4009 fd, file_offset);
4010 if (mapped_address == MAP_FAILED) {
4011 return NULL;
4012 }
4013 return mapped_address;
4014 }
4015
4016 // Remap a block of memory.
4017 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4018 char *addr, size_t bytes, bool read_only,
4019 bool allow_exec) {
4020 // same as map_memory() on this OS
4021 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4022 allow_exec);
4023 }
4024
4025 // Unmap a block of memory.
4026 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4027 return munmap(addr, bytes) == 0;
4028 }
4029
4030 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4031 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4032 // of a thread.
4033 //
4034 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4035 // the fast estimate available on the platform.
4036
4037 jlong os::current_thread_cpu_time() {
4038 // return user + sys since the cost is the same
4039 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4040 assert(n >= 0, "negative CPU time");
4041 return n;
4042 }
4043
4044 jlong os::thread_cpu_time(Thread* thread) {
4045 // consistent with what current_thread_cpu_time() returns
4046 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4047 assert(n >= 0, "negative CPU time");
4048 return n;
4049 }
4050
4051 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4052 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4053 assert(n >= 0, "negative CPU time");
4054 return n;
4055 }
4056
4057 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4058 bool error = false;
4059
4060 jlong sys_time = 0;
4061 jlong user_time = 0;
4062
4063 // Reimplemented using getthrds64().
4064 //
4065 // Works like this:
4066 // For the thread in question, get the kernel thread id. Then get the
4067 // kernel thread statistics using that id.
4068 //
4069 // This only works of course when no pthread scheduling is used,
4070 // i.e. there is a 1:1 relationship to kernel threads.
4071 // On AIX, see AIXTHREAD_SCOPE variable.
4072
4073 pthread_t pthtid = thread->osthread()->pthread_id();
4074
4075 // retrieve kernel thread id for the pthread:
4076 tid64_t tid = 0;
4077 struct __pthrdsinfo pinfo;
4078 // I just love those otherworldly IBM APIs which force me to hand down
4079 // dummy buffers for stuff I dont care for...
4080 char dummy[1];
4081 int dummy_size = sizeof(dummy);
4082 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4083 dummy, &dummy_size) == 0) {
4084 tid = pinfo.__pi_tid;
4085 } else {
4086 tty->print_cr("pthread_getthrds_np failed.");
4087 error = true;
4088 }
4089
4090 // retrieve kernel timing info for that kernel thread
4091 if (!error) {
4092 struct thrdentry64 thrdentry;
4093 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4094 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4095 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4096 } else {
4097 tty->print_cr("pthread_getthrds_np failed.");
4098 error = true;
4099 }
4100 }
4101
4102 if (p_sys_time) {
4103 *p_sys_time = sys_time;
4104 }
4105
4106 if (p_user_time) {
4107 *p_user_time = user_time;
4108 }
4109
4110 if (error) {
4111 return false;
4112 }
4113
4114 return true;
4115 }
4116
4117 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4118 jlong sys_time;
4119 jlong user_time;
4120
4121 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4122 return -1;
4123 }
4124
4125 return user_sys_cpu_time ? sys_time + user_time : user_time;
4126 }
4127
4128 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4129 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4130 info_ptr->may_skip_backward = false; // elapsed time not wall time
4131 info_ptr->may_skip_forward = false; // elapsed time not wall time
4132 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4133 }
4134
4135 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4136 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4137 info_ptr->may_skip_backward = false; // elapsed time not wall time
4138 info_ptr->may_skip_forward = false; // elapsed time not wall time
4139 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4140 }
4141
4142 bool os::is_thread_cpu_time_supported() {
4143 return true;
4144 }
4145
4146 // System loadavg support. Returns -1 if load average cannot be obtained.
4147 // For now just return the system wide load average (no processor sets).
4148 int os::loadavg(double values[], int nelem) {
4149
4150 // Implemented using libperfstat on AIX.
4151
4152 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4153 guarantee(values, "argument error");
4154
4155 if (os::Aix::on_pase()) {
4156 Unimplemented();
4157 return -1;
4158 } else {
4159 // AIX: use libperfstat
4160 //
4161 // See also:
4162 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4163 // /usr/include/libperfstat.h:
4164
4165 // Use the already AIX version independent get_cpuinfo.
4166 os::Aix::cpuinfo_t ci;
4167 if (os::Aix::get_cpuinfo(&ci)) {
4168 for (int i = 0; i < nelem; i++) {
4169 values[i] = ci.loadavg[i];
4170 }
4171 } else {
4172 return -1;
4173 }
4174 return nelem;
4175 }
4176 }
4177
4178 void os::pause() {
4179 char filename[MAX_PATH];
4180 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4181 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4182 } else {
4183 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4184 }
4185
4186 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4187 if (fd != -1) {
4188 struct stat buf;
4189 ::close(fd);
4190 while (::stat(filename, &buf) == 0) {
4191 (void)::poll(NULL, 0, 100);
4192 }
4193 } else {
4194 jio_fprintf(stderr,
4195 "Could not open pause file '%s', continuing immediately.\n", filename);
4196 }
4197 }
4198
4199 bool os::Aix::is_primordial_thread() {
4200 if (pthread_self() == (pthread_t)1) {
4201 return true;
4202 } else {
4203 return false;
4204 }
4205 }
4206
4207 // OS recognitions (PASE/AIX, OS level) call this before calling any
4208 // one of Aix::on_pase(), Aix::os_version() static
4209 void os::Aix::initialize_os_info() {
4210
4211 assert(_on_pase == -1 && _os_version == -1, "already called.");
4212
4213 struct utsname uts;
4214 memset(&uts, 0, sizeof(uts));
4215 strcpy(uts.sysname, "?");
4216 if (::uname(&uts) == -1) {
4217 trc("uname failed (%d)", errno);
4218 guarantee(0, "Could not determine whether we run on AIX or PASE");
4219 } else {
4220 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4221 "node \"%s\" machine \"%s\"\n",
4222 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4223 const int major = atoi(uts.version);
4224 assert(major > 0, "invalid OS version");
4225 const int minor = atoi(uts.release);
4226 assert(minor > 0, "invalid OS release");
4227 _os_version = (major << 8) | minor;
4228 if (strcmp(uts.sysname, "OS400") == 0) {
4229 Unimplemented();
4230 } else if (strcmp(uts.sysname, "AIX") == 0) {
4231 // We run on AIX. We do not support versions older than AIX 5.3.
4232 _on_pase = 0;
4233 if (_os_version < 0x0503) {
4234 trc("AIX release older than AIX 5.3 not supported.");
4235 assert(false, "AIX release too old.");
4236 } else {
4237 trcVerbose("We run on AIX %d.%d\n", major, minor);
4238 }
4239 } else {
4240 assert(false, "unknown OS");
4241 }
4242 }
4243
4244 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4245 } // end: os::Aix::initialize_os_info()
4246
4247 // Scan environment for important settings which might effect the VM.
4248 // Trace out settings. Warn about invalid settings and/or correct them.
4249 //
4250 // Must run after os::Aix::initialue_os_info().
4251 void os::Aix::scan_environment() {
4252
4253 char* p;
4254 int rc;
4255
4256 // Warn explicity if EXTSHM=ON is used. That switch changes how
4257 // System V shared memory behaves. One effect is that page size of
4258 // shared memory cannot be change dynamically, effectivly preventing
4259 // large pages from working.
4260 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4261 // recommendation is (in OSS notes) to switch it off.
4262 p = ::getenv("EXTSHM");
4263 if (Verbose) {
4264 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4265 }
4266 if (p && strcasecmp(p, "ON") == 0) {
4267 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4268 _extshm = 1;
4269 } else {
4270 _extshm = 0;
4271 }
4272
4273 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4274 // Not tested, not supported.
4275 //
4276 // Note that it might be worth the trouble to test and to require it, if only to
4277 // get useful return codes for mprotect.
4278 //
4279 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4280 // exec() ? before loading the libjvm ? ....)
4281 p = ::getenv("XPG_SUS_ENV");
4282 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4283 if (p && strcmp(p, "ON") == 0) {
4284 _xpg_sus_mode = 1;
4285 trc("Unsupported setting: XPG_SUS_ENV=ON");
4286 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4287 // clobber address ranges. If we ever want to support that, we have to do some
4288 // testing first.
4289 guarantee(false, "XPG_SUS_ENV=ON not supported");
4290 } else {
4291 _xpg_sus_mode = 0;
4292 }
4293
4294 // Switch off AIX internal (pthread) guard pages. This has
4295 // immediate effect for any pthread_create calls which follow.
4296 p = ::getenv("AIXTHREAD_GUARDPAGES");
4297 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4298 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4299 guarantee(rc == 0, "");
4300
4301 } // end: os::Aix::scan_environment()
4302
4303 // PASE: initialize the libo4 library (AS400 PASE porting library).
4304 void os::Aix::initialize_libo4() {
4305 Unimplemented();
4306 }
4307
4308 // AIX: initialize the libperfstat library (we load this dynamically
4309 // because it is only available on AIX.
4310 void os::Aix::initialize_libperfstat() {
4311
4312 assert(os::Aix::on_aix(), "AIX only");
4313
4314 if (!libperfstat::init()) {
4315 trc("libperfstat initialization failed.");
4316 assert(false, "libperfstat initialization failed");
4317 } else {
4318 if (Verbose) {
4319 fprintf(stderr, "libperfstat initialized.\n");
4320 }
4321 }
4322 } // end: os::Aix::initialize_libperfstat
4323
4324 /////////////////////////////////////////////////////////////////////////////
4325 // thread stack
4326
4327 // Function to query the current stack size using pthread_getthrds_np.
4328 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4329 // This only works when invoked on a pthread. As we agreed not to use
4330 // primordial threads anyway, I assert here.
4331 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4332
4333 // Information about this api can be found (a) in the pthread.h header and
4334 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4335 //
4336 // The use of this API to find out the current stack is kind of undefined.
4337 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4338 // enough for cases where I let the pthread library create its stacks. For cases
4339 // where I create an own stack and pass this to pthread_create, it seems not to
4340 // work (the returned stack size in that case is 0).
4341
4342 pthread_t tid = pthread_self();
4343 struct __pthrdsinfo pinfo;
4344 char dummy[1]; // We only need this to satisfy the api and to not get E.
4345 int dummy_size = sizeof(dummy);
4346
4347 memset(&pinfo, 0, sizeof(pinfo));
4348
4349 const int rc = pthread_getthrds_np(&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4350 sizeof(pinfo), dummy, &dummy_size);
4351
4352 if (rc != 0) {
4353 assert0(false);
4354 trcVerbose("pthread_getthrds_np failed (%d)", rc);
4355 return false;
4356 }
4357 guarantee0(pinfo.__pi_stackend);
4358
4359 // The following can happen when invoking pthread_getthrds_np on a pthread running
4360 // on a user provided stack (when handing down a stack to pthread create, see
4361 // pthread_attr_setstackaddr).
4362 // Not sure what to do here - I feel inclined to forbid this use case completely.
4363 guarantee0(pinfo.__pi_stacksize);
4364
4365 // Note: the pthread stack on AIX seems to look like this:
4366 //
4367 // --------------------- real base ? at page border ?
4368 //
4369 // pthread internal data, like ~2K, see also
4370 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/thread_supp_tun_params.htm
4371 //
4372 // --------------------- __pi_stackend - not page aligned, (xxxxF890)
4373 //
4374 // stack
4375 // ....
4376 //
4377 // stack
4378 //
4379 // --------------------- __pi_stackend - __pi_stacksize
4380 //
4381 // padding due to AIX guard pages (?) see AIXTHREAD_GUARDPAGES
4382 // --------------------- __pi_stackaddr (page aligned if AIXTHREAD_GUARDPAGES > 0)
4383 //
4384 // AIX guard pages (?)
4385 //
4386
4387 // So, the safe thing to do is to use the area from __pi_stackend to __pi_stackaddr;
4388 // __pi_stackend however is almost never page aligned.
4389 //
4390
4391 if (p_stack_base) {
4392 (*p_stack_base) = (address) (pinfo.__pi_stackend);
4393 }
4394
4395 if (p_stack_size) {
4396 (*p_stack_size) = pinfo.__pi_stackend - pinfo.__pi_stackaddr;
4397 }
4398
4399 return true;
4400 }
4401
4402 // Get the current stack base from the OS (actually, the pthread library).
4403 address os::current_stack_base() {
4404 address p;
4405 query_stack_dimensions(&p, 0);
4406 return p;
4407 }
4408
4409 // Get the current stack size from the OS (actually, the pthread library).
4410 size_t os::current_stack_size() {
4411 size_t s;
4412 query_stack_dimensions(0, &s);
4413 return s;
4414 }
4415
4416 // Refer to the comments in os_solaris.cpp park-unpark.
4417 //
4418 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4419 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4420 // For specifics regarding the bug see GLIBC BUGID 261237 :
4421 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4422 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4423 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4424 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4425 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4426 // and monitorenter when we're using 1-0 locking. All those operations may result in
4427 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4428 // of libpthread avoids the problem, but isn't practical.
4429 //
4430 // Possible remedies:
4431 //
4432 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4433 // This is palliative and probabilistic, however. If the thread is preempted
4434 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4435 // than the minimum period may have passed, and the abstime may be stale (in the
4436 // past) resultin in a hang. Using this technique reduces the odds of a hang
4437 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4438 //
4439 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4440 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4441 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4442 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4443 // thread.
4444 //
4445 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4446 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4447 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4448 // This also works well. In fact it avoids kernel-level scalability impediments
4449 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4450 // timers in a graceful fashion.
4451 //
4452 // 4. When the abstime value is in the past it appears that control returns
4453 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4454 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4455 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4456 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4457 // It may be possible to avoid reinitialization by checking the return
4458 // value from pthread_cond_timedwait(). In addition to reinitializing the
4459 // condvar we must establish the invariant that cond_signal() is only called
4460 // within critical sections protected by the adjunct mutex. This prevents
4461 // cond_signal() from "seeing" a condvar that's in the midst of being
4462 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4463 // desirable signal-after-unlock optimization that avoids futile context switching.
4464 //
4465 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4466 // structure when a condvar is used or initialized. cond_destroy() would
4467 // release the helper structure. Our reinitialize-after-timedwait fix
4468 // put excessive stress on malloc/free and locks protecting the c-heap.
4469 //
4470 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4471 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4472 // and only enabling the work-around for vulnerable environments.
4473
4474 // utility to compute the abstime argument to timedwait:
4475 // millis is the relative timeout time
4476 // abstime will be the absolute timeout time
4477 // TODO: replace compute_abstime() with unpackTime()
4478
4479 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4480 if (millis < 0) millis = 0;
4481 struct timeval now;
4482 int status = gettimeofday(&now, NULL);
4483 assert(status == 0, "gettimeofday");
4484 jlong seconds = millis / 1000;
4485 millis %= 1000;
4486 if (seconds > 50000000) { // see man cond_timedwait(3T)
4487 seconds = 50000000;
4488 }
4489 abstime->tv_sec = now.tv_sec + seconds;
4490 long usec = now.tv_usec + millis * 1000;
4491 if (usec >= 1000000) {
4492 abstime->tv_sec += 1;
4493 usec -= 1000000;
4494 }
4495 abstime->tv_nsec = usec * 1000;
4496 return abstime;
4497 }
4498
4499 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4500 // Conceptually TryPark() should be equivalent to park(0).
4501
4502 int os::PlatformEvent::TryPark() {
4503 for (;;) {
4504 const int v = _Event;
4505 guarantee ((v == 0) || (v == 1), "invariant");
4506 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4507 }
4508 }
4509
4510 void os::PlatformEvent::park() { // AKA "down()"
4511 // Invariant: Only the thread associated with the Event/PlatformEvent
4512 // may call park().
4513 // TODO: assert that _Assoc != NULL or _Assoc == Self
4514 int v;
4515 for (;;) {
4516 v = _Event;
4517 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4518 }
4519 guarantee (v >= 0, "invariant");
4520 if (v == 0) {
4521 // Do this the hard way by blocking ...
4522 int status = pthread_mutex_lock(_mutex);
4523 assert_status(status == 0, status, "mutex_lock");
4524 guarantee (_nParked == 0, "invariant");
4525 ++ _nParked;
4526 while (_Event < 0) {
4527 status = pthread_cond_wait(_cond, _mutex);
4528 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4529 }
4530 -- _nParked;
4531
4532 // In theory we could move the ST of 0 into _Event past the unlock(),
4533 // but then we'd need a MEMBAR after the ST.
4534 _Event = 0;
4535 status = pthread_mutex_unlock(_mutex);
4536 assert_status(status == 0, status, "mutex_unlock");
4537 }
4538 guarantee (_Event >= 0, "invariant");
4539 }
4540
4541 int os::PlatformEvent::park(jlong millis) {
4542 guarantee (_nParked == 0, "invariant");
4543
4544 int v;
4545 for (;;) {
4546 v = _Event;
4547 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4548 }
4549 guarantee (v >= 0, "invariant");
4550 if (v != 0) return OS_OK;
4551
4552 // We do this the hard way, by blocking the thread.
4553 // Consider enforcing a minimum timeout value.
4554 struct timespec abst;
4555 compute_abstime(&abst, millis);
4556
4557 int ret = OS_TIMEOUT;
4558 int status = pthread_mutex_lock(_mutex);
4559 assert_status(status == 0, status, "mutex_lock");
4560 guarantee (_nParked == 0, "invariant");
4561 ++_nParked;
4562
4563 // Object.wait(timo) will return because of
4564 // (a) notification
4565 // (b) timeout
4566 // (c) thread.interrupt
4567 //
4568 // Thread.interrupt and object.notify{All} both call Event::set.
4569 // That is, we treat thread.interrupt as a special case of notification.
4570 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4571 // We assume all ETIME returns are valid.
4572 //
4573 // TODO: properly differentiate simultaneous notify+interrupt.
4574 // In that case, we should propagate the notify to another waiter.
4575
4576 while (_Event < 0) {
4577 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4578 assert_status(status == 0 || status == ETIMEDOUT,
4579 status, "cond_timedwait");
4580 if (!FilterSpuriousWakeups) break; // previous semantics
4581 if (status == ETIMEDOUT) break;
4582 // We consume and ignore EINTR and spurious wakeups.
4583 }
4584 --_nParked;
4585 if (_Event >= 0) {
4586 ret = OS_OK;
4587 }
4588 _Event = 0;
4589 status = pthread_mutex_unlock(_mutex);
4590 assert_status(status == 0, status, "mutex_unlock");
4591 assert (_nParked == 0, "invariant");
4592 return ret;
4593 }
4594
4595 void os::PlatformEvent::unpark() {
4596 int v, AnyWaiters;
4597 for (;;) {
4598 v = _Event;
4599 if (v > 0) {
4600 // The LD of _Event could have reordered or be satisfied
4601 // by a read-aside from this processor's write buffer.
4602 // To avoid problems execute a barrier and then
4603 // ratify the value.
4604 OrderAccess::fence();
4605 if (_Event == v) return;
4606 continue;
4607 }
4608 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4609 }
4610 if (v < 0) {
4611 // Wait for the thread associated with the event to vacate
4612 int status = pthread_mutex_lock(_mutex);
4613 assert_status(status == 0, status, "mutex_lock");
4614 AnyWaiters = _nParked;
4615
4616 if (AnyWaiters != 0) {
4617 // We intentional signal *after* dropping the lock
4618 // to avoid a common class of futile wakeups.
4619 status = pthread_cond_signal(_cond);
4620 assert_status(status == 0, status, "cond_signal");
4621 }
4622 // Mutex should be locked for pthread_cond_signal(_cond).
4623 status = pthread_mutex_unlock(_mutex);
4624 assert_status(status == 0, status, "mutex_unlock");
4625 }
4626
4627 // Note that we signal() _after dropping the lock for "immortal" Events.
4628 // This is safe and avoids a common class of futile wakeups. In rare
4629 // circumstances this can cause a thread to return prematurely from
4630 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4631 // simply re-test the condition and re-park itself.
4632 }
4633
4634
4635 // JSR166
4636 // -------------------------------------------------------
4637
4638 //
4639 // The solaris and linux implementations of park/unpark are fairly
4640 // conservative for now, but can be improved. They currently use a
4641 // mutex/condvar pair, plus a a count.
4642 // Park decrements count if > 0, else does a condvar wait. Unpark
4643 // sets count to 1 and signals condvar. Only one thread ever waits
4644 // on the condvar. Contention seen when trying to park implies that someone
4645 // is unparking you, so don't wait. And spurious returns are fine, so there
4646 // is no need to track notifications.
4647 //
4648
4649 #define MAX_SECS 100000000
4650 //
4651 // This code is common to linux and solaris and will be moved to a
4652 // common place in dolphin.
4653 //
4654 // The passed in time value is either a relative time in nanoseconds
4655 // or an absolute time in milliseconds. Either way it has to be unpacked
4656 // into suitable seconds and nanoseconds components and stored in the
4657 // given timespec structure.
4658 // Given time is a 64-bit value and the time_t used in the timespec is only
4659 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4660 // overflow if times way in the future are given. Further on Solaris versions
4661 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4662 // number of seconds, in abstime, is less than current_time + 100,000,000.
4663 // As it will be 28 years before "now + 100000000" will overflow we can
4664 // ignore overflow and just impose a hard-limit on seconds using the value
4665 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4666 // years from "now".
4667 //
4668
4669 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4670 assert (time > 0, "convertTime");
4671
4672 struct timeval now;
4673 int status = gettimeofday(&now, NULL);
4674 assert(status == 0, "gettimeofday");
4675
4676 time_t max_secs = now.tv_sec + MAX_SECS;
4677
4678 if (isAbsolute) {
4679 jlong secs = time / 1000;
4680 if (secs > max_secs) {
4681 absTime->tv_sec = max_secs;
4682 }
4683 else {
4684 absTime->tv_sec = secs;
4685 }
4686 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4687 }
4688 else {
4689 jlong secs = time / NANOSECS_PER_SEC;
4690 if (secs >= MAX_SECS) {
4691 absTime->tv_sec = max_secs;
4692 absTime->tv_nsec = 0;
4693 }
4694 else {
4695 absTime->tv_sec = now.tv_sec + secs;
4696 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4697 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4698 absTime->tv_nsec -= NANOSECS_PER_SEC;
4699 ++absTime->tv_sec; // note: this must be <= max_secs
4700 }
4701 }
4702 }
4703 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4704 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4705 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4706 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4707 }
4708
4709 void Parker::park(bool isAbsolute, jlong time) {
4710 // Optional fast-path check:
4711 // Return immediately if a permit is available.
4712 if (_counter > 0) {
4713 _counter = 0;
4714 OrderAccess::fence();
4715 return;
4716 }
4717
4718 Thread* thread = Thread::current();
4719 assert(thread->is_Java_thread(), "Must be JavaThread");
4720 JavaThread *jt = (JavaThread *)thread;
4721
4722 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4723 // Check interrupt before trying to wait
4724 if (Thread::is_interrupted(thread, false)) {
4725 return;
4726 }
4727
4728 // Next, demultiplex/decode time arguments
4729 timespec absTime;
4730 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4731 return;
4732 }
4733 if (time > 0) {
4734 unpackTime(&absTime, isAbsolute, time);
4735 }
4736
4737 // Enter safepoint region
4738 // Beware of deadlocks such as 6317397.
4739 // The per-thread Parker:: mutex is a classic leaf-lock.
4740 // In particular a thread must never block on the Threads_lock while
4741 // holding the Parker:: mutex. If safepoints are pending both the
4742 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4743 ThreadBlockInVM tbivm(jt);
4744
4745 // Don't wait if cannot get lock since interference arises from
4746 // unblocking. Also. check interrupt before trying wait
4747 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4748 return;
4749 }
4750
4751 int status;
4752 if (_counter > 0) { // no wait needed
4753 _counter = 0;
4754 status = pthread_mutex_unlock(_mutex);
4755 assert (status == 0, "invariant");
4756 OrderAccess::fence();
4757 return;
4758 }
4759
4760 #ifdef ASSERT
4761 // Don't catch signals while blocked; let the running threads have the signals.
4762 // (This allows a debugger to break into the running thread.)
4763 sigset_t oldsigs;
4764 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4765 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4766 #endif
4767
4768 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4769 jt->set_suspend_equivalent();
4770 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4771
4772 if (time == 0) {
4773 status = pthread_cond_wait (_cond, _mutex);
4774 } else {
4775 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4776 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4777 pthread_cond_destroy (_cond);
4778 pthread_cond_init (_cond, NULL);
4779 }
4780 }
4781 assert_status(status == 0 || status == EINTR ||
4782 status == ETIME || status == ETIMEDOUT,
4783 status, "cond_timedwait");
4784
4785 #ifdef ASSERT
4786 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4787 #endif
4788
4789 _counter = 0;
4790 status = pthread_mutex_unlock(_mutex);
4791 assert_status(status == 0, status, "invariant");
4792 // If externally suspended while waiting, re-suspend
4793 if (jt->handle_special_suspend_equivalent_condition()) {
4794 jt->java_suspend_self();
4795 }
4796
4797 OrderAccess::fence();
4798 }
4799
4800 void Parker::unpark() {
4801 int s, status;
4802 status = pthread_mutex_lock(_mutex);
4803 assert (status == 0, "invariant");
4804 s = _counter;
4805 _counter = 1;
4806 if (s < 1) {
4807 if (WorkAroundNPTLTimedWaitHang) {
4808 status = pthread_cond_signal (_cond);
4809 assert (status == 0, "invariant");
4810 status = pthread_mutex_unlock(_mutex);
4811 assert (status == 0, "invariant");
4812 } else {
4813 status = pthread_mutex_unlock(_mutex);
4814 assert (status == 0, "invariant");
4815 status = pthread_cond_signal (_cond);
4816 assert (status == 0, "invariant");
4817 }
4818 } else {
4819 pthread_mutex_unlock(_mutex);
4820 assert (status == 0, "invariant");
4821 }
4822 }
4823
4824 extern char** environ;
4825
4826 // Run the specified command in a separate process. Return its exit value,
4827 // or -1 on failure (e.g. can't fork a new process).
4828 // Unlike system(), this function can be called from signal handler. It
4829 // doesn't block SIGINT et al.
4830 int os::fork_and_exec(char* cmd) {
4831 char * argv[4] = {"sh", "-c", cmd, NULL};
4832
4833 pid_t pid = fork();
4834
4835 if (pid < 0) {
4836 // fork failed
4837 return -1;
4838
4839 } else if (pid == 0) {
4840 // child process
4841
4842 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4843 execve("/usr/bin/sh", argv, environ);
4844
4845 // execve failed
4846 _exit(-1);
4847
4848 } else {
4849 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4850 // care about the actual exit code, for now.
4851
4852 int status;
4853
4854 // Wait for the child process to exit. This returns immediately if
4855 // the child has already exited. */
4856 while (waitpid(pid, &status, 0) < 0) {
4857 switch (errno) {
4858 case ECHILD: return 0;
4859 case EINTR: break;
4860 default: return -1;
4861 }
4862 }
4863
4864 if (WIFEXITED(status)) {
4865 // The child exited normally; get its exit code.
4866 return WEXITSTATUS(status);
4867 } else if (WIFSIGNALED(status)) {
4868 // The child exited because of a signal.
4869 // The best value to return is 0x80 + signal number,
4870 // because that is what all Unix shells do, and because
4871 // it allows callers to distinguish between process exit and
4872 // process death by signal.
4873 return 0x80 + WTERMSIG(status);
4874 } else {
4875 // Unknown exit code; pass it through.
4876 return status;
4877 }
4878 }
4879 return -1;
4880 }
4881
4882 // is_headless_jre()
4883 //
4884 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4885 // in order to report if we are running in a headless jre.
4886 //
4887 // Since JDK8 xawt/libmawt.so is moved into the same directory
4888 // as libawt.so, and renamed libawt_xawt.so
4889 bool os::is_headless_jre() {
4890 struct stat statbuf;
4891 char buf[MAXPATHLEN];
4892 char libmawtpath[MAXPATHLEN];
4893 const char *xawtstr = "/xawt/libmawt.so";
4894 const char *new_xawtstr = "/libawt_xawt.so";
4895
4896 char *p;
4897
4898 // Get path to libjvm.so
4899 os::jvm_path(buf, sizeof(buf));
4900
4901 // Get rid of libjvm.so
4902 p = strrchr(buf, '/');
4903 if (p == NULL) return false;
4904 else *p = '\0';
4905
4906 // Get rid of client or server
4907 p = strrchr(buf, '/');
4908 if (p == NULL) return false;
4909 else *p = '\0';
4910
4911 // check xawt/libmawt.so
4912 strcpy(libmawtpath, buf);
4913 strcat(libmawtpath, xawtstr);
4914 if (::stat(libmawtpath, &statbuf) == 0) return false;
4915
4916 // check libawt_xawt.so
4917 strcpy(libmawtpath, buf);
4918 strcat(libmawtpath, new_xawtstr);
4919 if (::stat(libmawtpath, &statbuf) == 0) return false;
4920
4921 return true;
4922 }
4923
4924 // Get the default path to the core file
4925 // Returns the length of the string
4926 int os::get_core_path(char* buffer, size_t bufferSize) {
4927 const char* p = get_current_directory(buffer, bufferSize);
4928
4929 if (p == NULL) {
4930 assert(p != NULL, "failed to get current directory");
4931 return 0;
4932 }
4933
4934 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4935 p, current_process_id());
4936
4937 return strlen(buffer);
4938 }
4939
4940 #ifndef PRODUCT
4941 void TestReserveMemorySpecial_test() {
4942 // No tests available for this platform
4943 }
4944 #endif