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 (os::Aix::supports_variable_stack_size()) {
975 if (stack_size == 0) {
976 stack_size = os::Aix::default_stack_size(thr_type);
977
978 switch (thr_type) {
979 case os::java_thread:
980 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
981 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
982 stack_size = JavaThread::stack_size_at_create();
983 break;
984 case os::compiler_thread:
985 if (CompilerThreadStackSize > 0) {
986 stack_size = (size_t)(CompilerThreadStackSize * K);
987 break;
988 } // else fall through:
989 // use VMThreadStackSize if CompilerThreadStackSize is not defined
990 case os::vm_thread:
991 case os::pgc_thread:
992 case os::cgc_thread:
993 case os::watcher_thread:
994 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
995 break;
996 }
997 }
998
999 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
1000 pthread_attr_setstacksize(&attr, stack_size);
1001 } //else let thread_create() pick the default value (96 K on AIX)
1002
1003 pthread_t tid;
1004 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
1005
1006 pthread_attr_destroy(&attr);
1007
1008 if (ret == 0) {
1009 // PPC port traceOsMisc(("Created New Thread : pthread-id %u", tid));
1010 } else {
1011 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1012 perror("pthread_create()");
1013 }
1014 // Need to clean up stuff we've allocated so far
1015 thread->set_osthread(NULL);
1016 delete osthread;
1017 return false;
1018 }
1019
1020 // Store pthread info into the OSThread
1021 osthread->set_pthread_id(tid);
1022
1023 return true;
1024 }
1025
1026 /////////////////////////////////////////////////////////////////////////////
1027 // attach existing thread
1028
1029 // bootstrap the main thread
1030 bool os::create_main_thread(JavaThread* thread) {
1031 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
1032 return create_attached_thread(thread);
1033 }
1034
1035 bool os::create_attached_thread(JavaThread* thread) {
1036 #ifdef ASSERT
1037 thread->verify_not_published();
1038 #endif
1039
1040 // Allocate the OSThread object
1041 OSThread* osthread = new OSThread(NULL, NULL);
1042
1043 if (osthread == NULL) {
1044 return false;
1045 }
1046
1047 // Store pthread info into the OSThread
1048 osthread->set_thread_id(os::Aix::gettid());
1049 osthread->set_pthread_id(::pthread_self());
1050
1051 // initialize floating point control register
1052 os::Aix::init_thread_fpu_state();
1053
1054 // some sanity checks
1055 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
1056
1057 // Initial thread state is RUNNABLE
1058 osthread->set_state(RUNNABLE);
1059
1060 thread->set_osthread(osthread);
1061
1062 if (UseNUMA) {
1063 int lgrp_id = os::numa_get_group_id();
1064 if (lgrp_id != -1) {
1065 thread->set_lgrp_id(lgrp_id);
1066 }
1067 }
1068
1069 // initialize signal mask for this thread
1070 // and save the caller's signal mask
1071 os::Aix::hotspot_sigmask(thread);
1072
1073 return true;
1074 }
1075
1076 void os::pd_start_thread(Thread* thread) {
1077 int status = pthread_continue_np(thread->osthread()->pthread_id());
1078 assert(status == 0, "thr_continue failed");
1079 }
1080
1081 // Free OS resources related to the OSThread
1082 void os::free_thread(OSThread* osthread) {
1083 assert(osthread != NULL, "osthread not set");
1084
1085 if (Thread::current()->osthread() == osthread) {
1086 // Restore caller's signal mask
1087 sigset_t sigmask = osthread->caller_sigmask();
1088 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1089 }
1090
1091 delete osthread;
1092 }
1093
1094 //////////////////////////////////////////////////////////////////////////////
1095 // thread local storage
1096
1097 int os::allocate_thread_local_storage() {
1098 pthread_key_t key;
1099 int rslt = pthread_key_create(&key, NULL);
1100 assert(rslt == 0, "cannot allocate thread local storage");
1101 return (int)key;
1102 }
1103
1104 // Note: This is currently not used by VM, as we don't destroy TLS key
1105 // on VM exit.
1106 void os::free_thread_local_storage(int index) {
1107 int rslt = pthread_key_delete((pthread_key_t)index);
1108 assert(rslt == 0, "invalid index");
1109 }
1110
1111 void os::thread_local_storage_at_put(int index, void* value) {
1112 int rslt = pthread_setspecific((pthread_key_t)index, value);
1113 assert(rslt == 0, "pthread_setspecific failed");
1114 }
1115
1116 extern "C" Thread* get_thread() {
1117 return ThreadLocalStorage::thread();
1118 }
1119
1120 ////////////////////////////////////////////////////////////////////////////////
1121 // time support
1122
1123 // Time since start-up in seconds to a fine granularity.
1124 // Used by VMSelfDestructTimer and the MemProfiler.
1125 double os::elapsedTime() {
1126 return (double)(os::elapsed_counter()) * 0.000001;
1127 }
1128
1129 jlong os::elapsed_counter() {
1130 timeval time;
1131 int status = gettimeofday(&time, NULL);
1132 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1133 }
1134
1135 jlong os::elapsed_frequency() {
1136 return (1000 * 1000);
1137 }
1138
1139 bool os::supports_vtime() { return true; }
1140 bool os::enable_vtime() { return false; }
1141 bool os::vtime_enabled() { return false; }
1142
1143 double os::elapsedVTime() {
1144 struct rusage usage;
1145 int retval = getrusage(RUSAGE_THREAD, &usage);
1146 if (retval == 0) {
1147 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1148 } else {
1149 // better than nothing, but not much
1150 return elapsedTime();
1151 }
1152 }
1153
1154 jlong os::javaTimeMillis() {
1155 timeval time;
1156 int status = gettimeofday(&time, NULL);
1157 assert(status != -1, "aix error at gettimeofday()");
1158 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1159 }
1160
1161 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1162 timeval time;
1163 int status = gettimeofday(&time, NULL);
1164 assert(status != -1, "aix error at gettimeofday()");
1165 seconds = jlong(time.tv_sec);
1166 nanos = jlong(time.tv_usec) * 1000;
1167 }
1168
1169
1170 // We need to manually declare mread_real_time,
1171 // because IBM didn't provide a prototype in time.h.
1172 // (they probably only ever tested in C, not C++)
1173 extern "C"
1174 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1175
1176 jlong os::javaTimeNanos() {
1177 if (os::Aix::on_pase()) {
1178 Unimplemented();
1179 return 0;
1180 } else {
1181 // On AIX use the precision of processors real time clock
1182 // or time base registers.
1183 timebasestruct_t time;
1184 int rc;
1185
1186 // If the CPU has a time register, it will be used and
1187 // we have to convert to real time first. After convertion we have following data:
1188 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1189 // time.tb_low [nanoseconds after the last full second above]
1190 // We better use mread_real_time here instead of read_real_time
1191 // to ensure that we will get a monotonic increasing time.
1192 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1193 rc = time_base_to_time(&time, TIMEBASE_SZ);
1194 assert(rc != -1, "aix error at time_base_to_time()");
1195 }
1196 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1197 }
1198 }
1199
1200 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1201 info_ptr->max_value = ALL_64_BITS;
1202 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1203 info_ptr->may_skip_backward = false;
1204 info_ptr->may_skip_forward = false;
1205 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1206 }
1207
1208 // Return the real, user, and system times in seconds from an
1209 // arbitrary fixed point in the past.
1210 bool os::getTimesSecs(double* process_real_time,
1211 double* process_user_time,
1212 double* process_system_time) {
1213 struct tms ticks;
1214 clock_t real_ticks = times(&ticks);
1215
1216 if (real_ticks == (clock_t) (-1)) {
1217 return false;
1218 } else {
1219 double ticks_per_second = (double) clock_tics_per_sec;
1220 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1221 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1222 *process_real_time = ((double) real_ticks) / ticks_per_second;
1223
1224 return true;
1225 }
1226 }
1227
1228 char * os::local_time_string(char *buf, size_t buflen) {
1229 struct tm t;
1230 time_t long_time;
1231 time(&long_time);
1232 localtime_r(&long_time, &t);
1233 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1234 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1235 t.tm_hour, t.tm_min, t.tm_sec);
1236 return buf;
1237 }
1238
1239 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1240 return localtime_r(clock, res);
1241 }
1242
1243 ////////////////////////////////////////////////////////////////////////////////
1244 // runtime exit support
1245
1246 // Note: os::shutdown() might be called very early during initialization, or
1247 // called from signal handler. Before adding something to os::shutdown(), make
1248 // sure it is async-safe and can handle partially initialized VM.
1249 void os::shutdown() {
1250
1251 // allow PerfMemory to attempt cleanup of any persistent resources
1252 perfMemory_exit();
1253
1254 // needs to remove object in file system
1255 AttachListener::abort();
1256
1257 // flush buffered output, finish log files
1258 ostream_abort();
1259
1260 // Check for abort hook
1261 abort_hook_t abort_hook = Arguments::abort_hook();
1262 if (abort_hook != NULL) {
1263 abort_hook();
1264 }
1265 }
1266
1267 // Note: os::abort() might be called very early during initialization, or
1268 // called from signal handler. Before adding something to os::abort(), make
1269 // sure it is async-safe and can handle partially initialized VM.
1270 void os::abort(bool dump_core, void* siginfo, void* context) {
1271 os::shutdown();
1272 if (dump_core) {
1273 #ifndef PRODUCT
1274 fdStream out(defaultStream::output_fd());
1275 out.print_raw("Current thread is ");
1276 char buf[16];
1277 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1278 out.print_raw_cr(buf);
1279 out.print_raw_cr("Dumping core ...");
1280 #endif
1281 ::abort(); // dump core
1282 }
1283
1284 ::exit(1);
1285 }
1286
1287 // Die immediately, no exit hook, no abort hook, no cleanup.
1288 void os::die() {
1289 ::abort();
1290 }
1291
1292 // This method is a copy of JDK's sysGetLastErrorString
1293 // from src/solaris/hpi/src/system_md.c
1294
1295 size_t os::lasterror(char *buf, size_t len) {
1296 if (errno == 0) return 0;
1297
1298 const char *s = ::strerror(errno);
1299 size_t n = ::strlen(s);
1300 if (n >= len) {
1301 n = len - 1;
1302 }
1303 ::strncpy(buf, s, n);
1304 buf[n] = '\0';
1305 return n;
1306 }
1307
1308 intx os::current_thread_id() { return (intx)pthread_self(); }
1309
1310 int os::current_process_id() {
1311
1312 // This implementation returns a unique pid, the pid of the
1313 // launcher thread that starts the vm 'process'.
1314
1315 // Under POSIX, getpid() returns the same pid as the
1316 // launcher thread rather than a unique pid per thread.
1317 // Use gettid() if you want the old pre NPTL behaviour.
1318
1319 // if you are looking for the result of a call to getpid() that
1320 // returns a unique pid for the calling thread, then look at the
1321 // OSThread::thread_id() method in osThread_linux.hpp file
1322
1323 return (int)(_initial_pid ? _initial_pid : getpid());
1324 }
1325
1326 // DLL functions
1327
1328 const char* os::dll_file_extension() { return ".so"; }
1329
1330 // This must be hard coded because it's the system's temporary
1331 // directory not the java application's temp directory, ala java.io.tmpdir.
1332 const char* os::get_temp_directory() { return "/tmp"; }
1333
1334 static bool file_exists(const char* filename) {
1335 struct stat statbuf;
1336 if (filename == NULL || strlen(filename) == 0) {
1337 return false;
1338 }
1339 return os::stat(filename, &statbuf) == 0;
1340 }
1341
1342 bool os::dll_build_name(char* buffer, size_t buflen,
1343 const char* pname, const char* fname) {
1344 bool retval = false;
1345 // Copied from libhpi
1346 const size_t pnamelen = pname ? strlen(pname) : 0;
1347
1348 // Return error on buffer overflow.
1349 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1350 *buffer = '\0';
1351 return retval;
1352 }
1353
1354 if (pnamelen == 0) {
1355 snprintf(buffer, buflen, "lib%s.so", fname);
1356 retval = true;
1357 } else if (strchr(pname, *os::path_separator()) != NULL) {
1358 int n;
1359 char** pelements = split_path(pname, &n);
1360 for (int i = 0; i < n; i++) {
1361 // Really shouldn't be NULL, but check can't hurt
1362 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1363 continue; // skip the empty path values
1364 }
1365 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1366 if (file_exists(buffer)) {
1367 retval = true;
1368 break;
1369 }
1370 }
1371 // release the storage
1372 for (int i = 0; i < n; i++) {
1373 if (pelements[i] != NULL) {
1374 FREE_C_HEAP_ARRAY(char, pelements[i]);
1375 }
1376 }
1377 if (pelements != NULL) {
1378 FREE_C_HEAP_ARRAY(char*, pelements);
1379 }
1380 } else {
1381 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1382 retval = true;
1383 }
1384 return retval;
1385 }
1386
1387 // Check if addr is inside libjvm.so.
1388 bool os::address_is_in_vm(address addr) {
1389
1390 // Input could be a real pc or a function pointer literal. The latter
1391 // would be a function descriptor residing in the data segment of a module.
1392
1393 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1394 if (lib) {
1395 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1396 return true;
1397 } else {
1398 return false;
1399 }
1400 } else {
1401 lib = LoadedLibraries::find_for_data_address(addr);
1402 if (lib) {
1403 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1404 return true;
1405 } else {
1406 return false;
1407 }
1408 } else {
1409 return false;
1410 }
1411 }
1412 }
1413
1414 // Resolve an AIX function descriptor literal to a code pointer.
1415 // If the input is a valid code pointer to a text segment of a loaded module,
1416 // it is returned unchanged.
1417 // If the input is a valid AIX function descriptor, it is resolved to the
1418 // code entry point.
1419 // If the input is neither a valid function descriptor nor a valid code pointer,
1420 // NULL is returned.
1421 static address resolve_function_descriptor_to_code_pointer(address p) {
1422
1423 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1424 if (lib) {
1425 // its a real code pointer
1426 return p;
1427 } else {
1428 lib = LoadedLibraries::find_for_data_address(p);
1429 if (lib) {
1430 // pointer to data segment, potential function descriptor
1431 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1432 if (LoadedLibraries::find_for_text_address(code_entry)) {
1433 // Its a function descriptor
1434 return code_entry;
1435 }
1436 }
1437 }
1438 return NULL;
1439 }
1440
1441 bool os::dll_address_to_function_name(address addr, char *buf,
1442 int buflen, int *offset,
1443 bool demangle) {
1444 if (offset) {
1445 *offset = -1;
1446 }
1447 // Buf is not optional, but offset is optional.
1448 assert(buf != NULL, "sanity check");
1449 buf[0] = '\0';
1450
1451 // Resolve function ptr literals first.
1452 addr = resolve_function_descriptor_to_code_pointer(addr);
1453 if (!addr) {
1454 return false;
1455 }
1456
1457 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1458 return Decoder::decode(addr, buf, buflen, offset, demangle);
1459 }
1460
1461 static int getModuleName(codeptr_t pc, // [in] program counter
1462 char* p_name, size_t namelen, // [out] optional: function name
1463 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1464 ) {
1465
1466 // initialize output parameters
1467 if (p_name && namelen > 0) {
1468 *p_name = '\0';
1469 }
1470 if (p_errmsg && errmsglen > 0) {
1471 *p_errmsg = '\0';
1472 }
1473
1474 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1475 if (lib) {
1476 if (p_name && namelen > 0) {
1477 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1478 }
1479 return 0;
1480 }
1481
1482 trcVerbose("pc outside any module");
1483
1484 return -1;
1485 }
1486
1487 bool os::dll_address_to_library_name(address addr, char* buf,
1488 int buflen, int* offset) {
1489 if (offset) {
1490 *offset = -1;
1491 }
1492 // Buf is not optional, but offset is optional.
1493 assert(buf != NULL, "sanity check");
1494 buf[0] = '\0';
1495
1496 // Resolve function ptr literals first.
1497 addr = resolve_function_descriptor_to_code_pointer(addr);
1498 if (!addr) {
1499 return false;
1500 }
1501
1502 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1503 return true;
1504 }
1505 return false;
1506 }
1507
1508 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1509 // for the same architecture as Hotspot is running on.
1510 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1511
1512 if (ebuf && ebuflen > 0) {
1513 ebuf[0] = '\0';
1514 ebuf[ebuflen - 1] = '\0';
1515 }
1516
1517 if (!filename || strlen(filename) == 0) {
1518 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1519 return NULL;
1520 }
1521
1522 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1523 void * result= ::dlopen(filename, RTLD_LAZY);
1524 if (result != NULL) {
1525 // Reload dll cache. Don't do this in signal handling.
1526 LoadedLibraries::reload();
1527 return result;
1528 } else {
1529 // error analysis when dlopen fails
1530 const char* const error_report = ::dlerror();
1531 if (error_report && ebuf && ebuflen > 0) {
1532 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1533 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1534 }
1535 }
1536 return NULL;
1537 }
1538
1539 void* os::dll_lookup(void* handle, const char* name) {
1540 void* res = dlsym(handle, name);
1541 return res;
1542 }
1543
1544 void* os::get_default_process_handle() {
1545 return (void*)::dlopen(NULL, RTLD_LAZY);
1546 }
1547
1548 void os::print_dll_info(outputStream *st) {
1549 st->print_cr("Dynamic libraries:");
1550 LoadedLibraries::print(st);
1551 }
1552
1553 void os::get_summary_os_info(char* buf, size_t buflen) {
1554 // There might be something more readable than uname results for AIX.
1555 struct utsname name;
1556 uname(&name);
1557 snprintf(buf, buflen, "%s %s", name.release, name.version);
1558 }
1559
1560 void os::print_os_info(outputStream* st) {
1561 st->print("OS:");
1562
1563 st->print("uname:");
1564 struct utsname name;
1565 uname(&name);
1566 st->print(name.sysname); st->print(" ");
1567 st->print(name.nodename); st->print(" ");
1568 st->print(name.release); st->print(" ");
1569 st->print(name.version); st->print(" ");
1570 st->print(name.machine);
1571 st->cr();
1572
1573 // rlimit
1574 st->print("rlimit:");
1575 struct rlimit rlim;
1576
1577 st->print(" STACK ");
1578 getrlimit(RLIMIT_STACK, &rlim);
1579 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1580 else st->print("%uk", rlim.rlim_cur >> 10);
1581
1582 st->print(", CORE ");
1583 getrlimit(RLIMIT_CORE, &rlim);
1584 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1585 else st->print("%uk", rlim.rlim_cur >> 10);
1586
1587 st->print(", NPROC ");
1588 st->print("%d", sysconf(_SC_CHILD_MAX));
1589
1590 st->print(", NOFILE ");
1591 getrlimit(RLIMIT_NOFILE, &rlim);
1592 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1593 else st->print("%d", rlim.rlim_cur);
1594
1595 st->print(", AS ");
1596 getrlimit(RLIMIT_AS, &rlim);
1597 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1598 else st->print("%uk", rlim.rlim_cur >> 10);
1599
1600 // Print limits on DATA, because it limits the C-heap.
1601 st->print(", DATA ");
1602 getrlimit(RLIMIT_DATA, &rlim);
1603 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1604 else st->print("%uk", rlim.rlim_cur >> 10);
1605 st->cr();
1606
1607 // load average
1608 st->print("load average:");
1609 double loadavg[3] = {-1.L, -1.L, -1.L};
1610 os::loadavg(loadavg, 3);
1611 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1612 st->cr();
1613 }
1614
1615 void os::print_memory_info(outputStream* st) {
1616
1617 st->print_cr("Memory:");
1618
1619 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1620 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1621 st->print_cr(" Default shared memory page size: %s",
1622 describe_pagesize(g_multipage_support.shmpsize));
1623 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1624 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1625 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1626 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1627 if (g_multipage_error != 0) {
1628 st->print_cr(" multipage error: %d", g_multipage_error);
1629 }
1630
1631 // print out LDR_CNTRL because it affects the default page sizes
1632 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1633 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1634
1635 const char* const extshm = ::getenv("EXTSHM");
1636 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1637 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1638 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1639 }
1640
1641 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1642 os::Aix::meminfo_t mi;
1643 if (os::Aix::get_meminfo(&mi)) {
1644 char buffer[256];
1645 if (os::Aix::on_aix()) {
1646 jio_snprintf(buffer, sizeof(buffer),
1647 " physical total : %llu\n"
1648 " physical free : %llu\n"
1649 " swap total : %llu\n"
1650 " swap free : %llu\n",
1651 mi.real_total,
1652 mi.real_free,
1653 mi.pgsp_total,
1654 mi.pgsp_free);
1655 } else {
1656 Unimplemented();
1657 }
1658 st->print_raw(buffer);
1659 } else {
1660 st->print_cr(" (no more information available)");
1661 }
1662 }
1663
1664 // Get a string for the cpuinfo that is a summary of the cpu type
1665 // This looks good
1666 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1667 // This looks good
1668 os::Aix::cpuinfo_t ci;
1669 if (os::Aix::get_cpuinfo(&ci)) {
1670 strncpy(buf, ci.version, buflen);
1671 } else {
1672 strncpy(buf, "AIX", buflen);
1673 }
1674 }
1675
1676 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1677 // cpu
1678 st->print("CPU:");
1679 st->print("total %d", os::processor_count());
1680 // It's not safe to query number of active processors after crash
1681 // st->print("(active %d)", os::active_processor_count());
1682 st->print(" %s", VM_Version::cpu_features());
1683 st->cr();
1684 }
1685
1686 void os::print_siginfo(outputStream* st, void* siginfo) {
1687 // Use common posix version.
1688 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1689 st->cr();
1690 }
1691
1692 static void print_signal_handler(outputStream* st, int sig,
1693 char* buf, size_t buflen);
1694
1695 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1696 st->print_cr("Signal Handlers:");
1697 print_signal_handler(st, SIGSEGV, buf, buflen);
1698 print_signal_handler(st, SIGBUS , buf, buflen);
1699 print_signal_handler(st, SIGFPE , buf, buflen);
1700 print_signal_handler(st, SIGPIPE, buf, buflen);
1701 print_signal_handler(st, SIGXFSZ, buf, buflen);
1702 print_signal_handler(st, SIGILL , buf, buflen);
1703 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1704 print_signal_handler(st, SR_signum, buf, buflen);
1705 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1706 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1707 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1708 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1709 print_signal_handler(st, SIGTRAP, buf, buflen);
1710 print_signal_handler(st, SIGDANGER, buf, buflen);
1711 }
1712
1713 static char saved_jvm_path[MAXPATHLEN] = {0};
1714
1715 // Find the full path to the current module, libjvm.so.
1716 void os::jvm_path(char *buf, jint buflen) {
1717 // Error checking.
1718 if (buflen < MAXPATHLEN) {
1719 assert(false, "must use a large-enough buffer");
1720 buf[0] = '\0';
1721 return;
1722 }
1723 // Lazy resolve the path to current module.
1724 if (saved_jvm_path[0] != 0) {
1725 strcpy(buf, saved_jvm_path);
1726 return;
1727 }
1728
1729 Dl_info dlinfo;
1730 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1731 assert(ret != 0, "cannot locate libjvm");
1732 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1733 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1734
1735 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1736 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1737 }
1738
1739 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1740 // no prefix required, not even "_"
1741 }
1742
1743 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1744 // no suffix required
1745 }
1746
1747 ////////////////////////////////////////////////////////////////////////////////
1748 // sun.misc.Signal support
1749
1750 static volatile jint sigint_count = 0;
1751
1752 static void
1753 UserHandler(int sig, void *siginfo, void *context) {
1754 // 4511530 - sem_post is serialized and handled by the manager thread. When
1755 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1756 // don't want to flood the manager thread with sem_post requests.
1757 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1758 return;
1759
1760 // Ctrl-C is pressed during error reporting, likely because the error
1761 // handler fails to abort. Let VM die immediately.
1762 if (sig == SIGINT && is_error_reported()) {
1763 os::die();
1764 }
1765
1766 os::signal_notify(sig);
1767 }
1768
1769 void* os::user_handler() {
1770 return CAST_FROM_FN_PTR(void*, UserHandler);
1771 }
1772
1773 extern "C" {
1774 typedef void (*sa_handler_t)(int);
1775 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1776 }
1777
1778 void* os::signal(int signal_number, void* handler) {
1779 struct sigaction sigAct, oldSigAct;
1780
1781 sigfillset(&(sigAct.sa_mask));
1782
1783 // Do not block out synchronous signals in the signal handler.
1784 // Blocking synchronous signals only makes sense if you can really
1785 // be sure that those signals won't happen during signal handling,
1786 // when the blocking applies. Normal signal handlers are lean and
1787 // do not cause signals. But our signal handlers tend to be "risky"
1788 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1789 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1790 // by a SIGILL, which was blocked due to the signal mask. The process
1791 // just hung forever. Better to crash from a secondary signal than to hang.
1792 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1793 sigdelset(&(sigAct.sa_mask), SIGBUS);
1794 sigdelset(&(sigAct.sa_mask), SIGILL);
1795 sigdelset(&(sigAct.sa_mask), SIGFPE);
1796 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1797
1798 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1799
1800 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1801
1802 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1803 // -1 means registration failed
1804 return (void *)-1;
1805 }
1806
1807 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1808 }
1809
1810 void os::signal_raise(int signal_number) {
1811 ::raise(signal_number);
1812 }
1813
1814 //
1815 // The following code is moved from os.cpp for making this
1816 // code platform specific, which it is by its very nature.
1817 //
1818
1819 // Will be modified when max signal is changed to be dynamic
1820 int os::sigexitnum_pd() {
1821 return NSIG;
1822 }
1823
1824 // a counter for each possible signal value
1825 static volatile jint pending_signals[NSIG+1] = { 0 };
1826
1827 // Linux(POSIX) specific hand shaking semaphore.
1828 static sem_t sig_sem;
1829
1830 void os::signal_init_pd() {
1831 // Initialize signal structures
1832 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1833
1834 // Initialize signal semaphore
1835 int rc = ::sem_init(&sig_sem, 0, 0);
1836 guarantee(rc != -1, "sem_init failed");
1837 }
1838
1839 void os::signal_notify(int sig) {
1840 Atomic::inc(&pending_signals[sig]);
1841 ::sem_post(&sig_sem);
1842 }
1843
1844 static int check_pending_signals(bool wait) {
1845 Atomic::store(0, &sigint_count);
1846 for (;;) {
1847 for (int i = 0; i < NSIG + 1; i++) {
1848 jint n = pending_signals[i];
1849 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1850 return i;
1851 }
1852 }
1853 if (!wait) {
1854 return -1;
1855 }
1856 JavaThread *thread = JavaThread::current();
1857 ThreadBlockInVM tbivm(thread);
1858
1859 bool threadIsSuspended;
1860 do {
1861 thread->set_suspend_equivalent();
1862 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1863
1864 ::sem_wait(&sig_sem);
1865
1866 // were we externally suspended while we were waiting?
1867 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1868 if (threadIsSuspended) {
1869 //
1870 // The semaphore has been incremented, but while we were waiting
1871 // another thread suspended us. We don't want to continue running
1872 // while suspended because that would surprise the thread that
1873 // suspended us.
1874 //
1875 ::sem_post(&sig_sem);
1876
1877 thread->java_suspend_self();
1878 }
1879 } while (threadIsSuspended);
1880 }
1881 }
1882
1883 int os::signal_lookup() {
1884 return check_pending_signals(false);
1885 }
1886
1887 int os::signal_wait() {
1888 return check_pending_signals(true);
1889 }
1890
1891 ////////////////////////////////////////////////////////////////////////////////
1892 // Virtual Memory
1893
1894 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1895
1896 #define VMEM_MAPPED 1
1897 #define VMEM_SHMATED 2
1898
1899 struct vmembk_t {
1900 int type; // 1 - mmap, 2 - shmat
1901 char* addr;
1902 size_t size; // Real size, may be larger than usersize.
1903 size_t pagesize; // page size of area
1904 vmembk_t* next;
1905
1906 bool contains_addr(char* p) const {
1907 return p >= addr && p < (addr + size);
1908 }
1909
1910 bool contains_range(char* p, size_t s) const {
1911 return contains_addr(p) && contains_addr(p + s - 1);
1912 }
1913
1914 void print_on(outputStream* os) const {
1915 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1916 " bytes, %d %s pages), %s",
1917 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1918 (type == VMEM_SHMATED ? "shmat" : "mmap")
1919 );
1920 }
1921
1922 // Check that range is a sub range of memory block (or equal to memory block);
1923 // also check that range is fully page aligned to the page size if the block.
1924 void assert_is_valid_subrange(char* p, size_t s) const {
1925 if (!contains_range(p, s)) {
1926 fprintf(stderr, "[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1927 "range of [" PTR_FORMAT " - " PTR_FORMAT "].\n",
1928 p, p + s - 1, addr, addr + size - 1);
1929 guarantee0(false);
1930 }
1931 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1932 fprintf(stderr, "range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1933 " aligned to pagesize (%s)\n", p, p + s);
1934 guarantee0(false);
1935 }
1936 }
1937 };
1938
1939 static struct {
1940 vmembk_t* first;
1941 MiscUtils::CritSect cs;
1942 } vmem;
1943
1944 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1945 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1946 assert0(p);
1947 if (p) {
1948 MiscUtils::AutoCritSect lck(&vmem.cs);
1949 p->addr = addr; p->size = size;
1950 p->pagesize = pagesize;
1951 p->type = type;
1952 p->next = vmem.first;
1953 vmem.first = p;
1954 }
1955 }
1956
1957 static vmembk_t* vmembk_find(char* addr) {
1958 MiscUtils::AutoCritSect lck(&vmem.cs);
1959 for (vmembk_t* p = vmem.first; p; p = p->next) {
1960 if (p->addr <= addr && (p->addr + p->size) > addr) {
1961 return p;
1962 }
1963 }
1964 return NULL;
1965 }
1966
1967 static void vmembk_remove(vmembk_t* p0) {
1968 MiscUtils::AutoCritSect lck(&vmem.cs);
1969 assert0(p0);
1970 assert0(vmem.first); // List should not be empty.
1971 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1972 if (*pp == p0) {
1973 *pp = p0->next;
1974 ::free(p0);
1975 return;
1976 }
1977 }
1978 assert0(false); // Not found?
1979 }
1980
1981 static void vmembk_print_on(outputStream* os) {
1982 MiscUtils::AutoCritSect lck(&vmem.cs);
1983 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1984 vmi->print_on(os);
1985 os->cr();
1986 }
1987 }
1988
1989 // Reserve and attach a section of System V memory.
1990 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1991 // address. Failing that, it will attach the memory anywhere.
1992 // If <requested_addr> is NULL, function will attach the memory anywhere.
1993 //
1994 // <alignment_hint> is being ignored by this function. It is very probable however that the
1995 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1996 // Should this be not enogh, we can put more work into it.
1997 static char* reserve_shmated_memory (
1998 size_t bytes,
1999 char* requested_addr,
2000 size_t alignment_hint) {
2001
2002 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
2003 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
2004 bytes, requested_addr, alignment_hint);
2005
2006 // Either give me wish address or wish alignment but not both.
2007 assert0(!(requested_addr != NULL && alignment_hint != 0));
2008
2009 // We must prevent anyone from attaching too close to the
2010 // BRK because that may cause malloc OOM.
2011 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2012 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2013 "Will attach anywhere.", requested_addr);
2014 // Act like the OS refused to attach there.
2015 requested_addr = NULL;
2016 }
2017
2018 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
2019 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
2020 if (os::Aix::on_pase_V5R4_or_older()) {
2021 ShouldNotReachHere();
2022 }
2023
2024 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
2025 const size_t size = align_size_up(bytes, SIZE_64K);
2026
2027 // Reserve the shared segment.
2028 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2029 if (shmid == -1) {
2030 trc("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
2031 return NULL;
2032 }
2033
2034 // Important note:
2035 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2036 // We must right after attaching it remove it from the system. System V shm segments are global and
2037 // survive the process.
2038 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
2039
2040 struct shmid_ds shmbuf;
2041 memset(&shmbuf, 0, sizeof(shmbuf));
2042 shmbuf.shm_pagesize = SIZE_64K;
2043 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
2044 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
2045 size / SIZE_64K, errno);
2046 // I want to know if this ever happens.
2047 assert(false, "failed to set page size for shmat");
2048 }
2049
2050 // Now attach the shared segment.
2051 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2052 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2053 // were not a segment boundary.
2054 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2055 const int errno_shmat = errno;
2056
2057 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2058 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2059 trc("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2060 assert(false, "failed to remove shared memory segment!");
2061 }
2062
2063 // Handle shmat error. If we failed to attach, just return.
2064 if (addr == (char*)-1) {
2065 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2066 return NULL;
2067 }
2068
2069 // Just for info: query the real page size. In case setting the page size did not
2070 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2071 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2072 if (real_pagesize != shmbuf.shm_pagesize) {
2073 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2074 }
2075
2076 if (addr) {
2077 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2078 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2079 } else {
2080 if (requested_addr != NULL) {
2081 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2082 } else {
2083 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2084 }
2085 }
2086
2087 // book-keeping
2088 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2089 assert0(is_aligned_to(addr, os::vm_page_size()));
2090
2091 return addr;
2092 }
2093
2094 static bool release_shmated_memory(char* addr, size_t size) {
2095
2096 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2097 addr, addr + size - 1);
2098
2099 bool rc = false;
2100
2101 // TODO: is there a way to verify shm size without doing bookkeeping?
2102 if (::shmdt(addr) != 0) {
2103 trcVerbose("error (%d).", errno);
2104 } else {
2105 trcVerbose("ok.");
2106 rc = true;
2107 }
2108 return rc;
2109 }
2110
2111 static bool uncommit_shmated_memory(char* addr, size_t size) {
2112 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2113 addr, addr + size - 1);
2114
2115 const bool rc = my_disclaim64(addr, size);
2116
2117 if (!rc) {
2118 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2119 return false;
2120 }
2121 return true;
2122 }
2123
2124 // Reserve memory via mmap.
2125 // If <requested_addr> is given, an attempt is made to attach at the given address.
2126 // Failing that, memory is allocated at any address.
2127 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2128 // allocate at an address aligned with the given alignment. Failing that, memory
2129 // is aligned anywhere.
2130 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2131 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2132 "alignment_hint " UINTX_FORMAT "...",
2133 bytes, requested_addr, alignment_hint);
2134
2135 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2136 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2137 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2138 return NULL;
2139 }
2140
2141 // We must prevent anyone from attaching too close to the
2142 // BRK because that may cause malloc OOM.
2143 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2144 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2145 "Will attach anywhere.", requested_addr);
2146 // Act like the OS refused to attach there.
2147 requested_addr = NULL;
2148 }
2149
2150 // Specify one or the other but not both.
2151 assert0(!(requested_addr != NULL && alignment_hint > 0));
2152
2153 // In 64K mode, we claim the global page size (os::vm_page_size())
2154 // is 64K. This is one of the few points where that illusion may
2155 // break, because mmap() will always return memory aligned to 4K. So
2156 // we must ensure we only ever return memory aligned to 64k.
2157 if (alignment_hint) {
2158 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2159 } else {
2160 alignment_hint = os::vm_page_size();
2161 }
2162
2163 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2164 const size_t size = align_size_up(bytes, os::vm_page_size());
2165
2166 // alignment: Allocate memory large enough to include an aligned range of the right size and
2167 // cut off the leading and trailing waste pages.
2168 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2169 const size_t extra_size = size + alignment_hint;
2170
2171 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2172 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2173 int flags = MAP_ANONYMOUS | MAP_SHARED;
2174
2175 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2176 // it means if wishaddress is given but MAP_FIXED is not set.
2177 //
2178 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2179 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2180 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2181 // get clobbered.
2182 if (requested_addr != NULL) {
2183 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2184 flags |= MAP_FIXED;
2185 }
2186 }
2187
2188 char* addr = (char*)::mmap(requested_addr, extra_size,
2189 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2190
2191 if (addr == MAP_FAILED) {
2192 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2193 return NULL;
2194 }
2195
2196 // Handle alignment.
2197 char* const addr_aligned = (char *)align_ptr_up(addr, alignment_hint);
2198 const size_t waste_pre = addr_aligned - addr;
2199 char* const addr_aligned_end = addr_aligned + size;
2200 const size_t waste_post = extra_size - waste_pre - size;
2201 if (waste_pre > 0) {
2202 ::munmap(addr, waste_pre);
2203 }
2204 if (waste_post > 0) {
2205 ::munmap(addr_aligned_end, waste_post);
2206 }
2207 addr = addr_aligned;
2208
2209 if (addr) {
2210 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2211 addr, addr + bytes, bytes);
2212 } else {
2213 if (requested_addr != NULL) {
2214 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2215 } else {
2216 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2217 }
2218 }
2219
2220 // bookkeeping
2221 vmembk_add(addr, size, SIZE_4K, VMEM_MAPPED);
2222
2223 // Test alignment, see above.
2224 assert0(is_aligned_to(addr, os::vm_page_size()));
2225
2226 return addr;
2227 }
2228
2229 static bool release_mmaped_memory(char* addr, size_t size) {
2230 assert0(is_aligned_to(addr, os::vm_page_size()));
2231 assert0(is_aligned_to(size, os::vm_page_size()));
2232
2233 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2234 addr, addr + size - 1);
2235 bool rc = false;
2236
2237 if (::munmap(addr, size) != 0) {
2238 trcVerbose("failed (%d)\n", errno);
2239 rc = false;
2240 } else {
2241 trcVerbose("ok.");
2242 rc = true;
2243 }
2244
2245 return rc;
2246 }
2247
2248 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2249
2250 assert0(is_aligned_to(addr, os::vm_page_size()));
2251 assert0(is_aligned_to(size, os::vm_page_size()));
2252
2253 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2254 addr, addr + size - 1);
2255 bool rc = false;
2256
2257 // Uncommit mmap memory with msync MS_INVALIDATE.
2258 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2259 trcVerbose("failed (%d)\n", errno);
2260 rc = false;
2261 } else {
2262 trcVerbose("ok.");
2263 rc = true;
2264 }
2265
2266 return rc;
2267 }
2268
2269 // End: shared memory bookkeeping
2270 ////////////////////////////////////////////////////////////////////////////////////////////////////
2271
2272 int os::vm_page_size() {
2273 // Seems redundant as all get out.
2274 assert(os::Aix::page_size() != -1, "must call os::init");
2275 return os::Aix::page_size();
2276 }
2277
2278 // Aix allocates memory by pages.
2279 int os::vm_allocation_granularity() {
2280 assert(os::Aix::page_size() != -1, "must call os::init");
2281 return os::Aix::page_size();
2282 }
2283
2284 #ifdef PRODUCT
2285 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2286 int err) {
2287 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2288 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2289 strerror(err), err);
2290 }
2291 #endif
2292
2293 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2294 const char* mesg) {
2295 assert(mesg != NULL, "mesg must be specified");
2296 if (!pd_commit_memory(addr, size, exec)) {
2297 // Add extra info in product mode for vm_exit_out_of_memory():
2298 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2299 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
2300 }
2301 }
2302
2303 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2304
2305 assert0(is_aligned_to(addr, os::vm_page_size()));
2306 assert0(is_aligned_to(size, os::vm_page_size()));
2307
2308 vmembk_t* const vmi = vmembk_find(addr);
2309 assert0(vmi);
2310 vmi->assert_is_valid_subrange(addr, size);
2311
2312 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2313
2314 return true;
2315 }
2316
2317 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2318 return pd_commit_memory(addr, size, exec);
2319 }
2320
2321 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2322 size_t alignment_hint, bool exec,
2323 const char* mesg) {
2324 // Alignment_hint is ignored on this OS.
2325 pd_commit_memory_or_exit(addr, size, exec, mesg);
2326 }
2327
2328 bool os::pd_uncommit_memory(char* addr, size_t size) {
2329 assert0(is_aligned_to(addr, os::vm_page_size()));
2330 assert0(is_aligned_to(size, os::vm_page_size()));
2331
2332 // Dynamically do different things for mmap/shmat.
2333 const vmembk_t* const vmi = vmembk_find(addr);
2334 assert0(vmi);
2335 vmi->assert_is_valid_subrange(addr, size);
2336
2337 if (vmi->type == VMEM_SHMATED) {
2338 return uncommit_shmated_memory(addr, size);
2339 } else {
2340 return uncommit_mmaped_memory(addr, size);
2341 }
2342 }
2343
2344 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2345 // Do not call this; no need to commit stack pages on AIX.
2346 ShouldNotReachHere();
2347 return true;
2348 }
2349
2350 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2351 // Do not call this; no need to commit stack pages on AIX.
2352 ShouldNotReachHere();
2353 return true;
2354 }
2355
2356 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2357 }
2358
2359 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2360 }
2361
2362 void os::numa_make_global(char *addr, size_t bytes) {
2363 }
2364
2365 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2366 }
2367
2368 bool os::numa_topology_changed() {
2369 return false;
2370 }
2371
2372 size_t os::numa_get_groups_num() {
2373 return 1;
2374 }
2375
2376 int os::numa_get_group_id() {
2377 return 0;
2378 }
2379
2380 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2381 if (size > 0) {
2382 ids[0] = 0;
2383 return 1;
2384 }
2385 return 0;
2386 }
2387
2388 bool os::get_page_info(char *start, page_info* info) {
2389 return false;
2390 }
2391
2392 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2393 return end;
2394 }
2395
2396 // Reserves and attaches a shared memory segment.
2397 // Will assert if a wish address is given and could not be obtained.
2398 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2399
2400 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2401 // thereby clobbering old mappings at that place. That is probably
2402 // not intended, never used and almost certainly an error were it
2403 // ever be used this way (to try attaching at a specified address
2404 // without clobbering old mappings an alternate API exists,
2405 // os::attempt_reserve_memory_at()).
2406 // Instead of mimicking the dangerous coding of the other platforms, here I
2407 // just ignore the request address (release) or assert(debug).
2408 assert0(requested_addr == NULL);
2409
2410 // Always round to os::vm_page_size(), which may be larger than 4K.
2411 bytes = align_size_up(bytes, os::vm_page_size());
2412 const size_t alignment_hint0 =
2413 alignment_hint ? align_size_up(alignment_hint, os::vm_page_size()) : 0;
2414
2415 // In 4K mode always use mmap.
2416 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2417 if (os::vm_page_size() == SIZE_4K) {
2418 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2419 } else {
2420 if (bytes >= Use64KPagesThreshold) {
2421 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2422 } else {
2423 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2424 }
2425 }
2426 }
2427
2428 bool os::pd_release_memory(char* addr, size_t size) {
2429
2430 // Dynamically do different things for mmap/shmat.
2431 vmembk_t* const vmi = vmembk_find(addr);
2432 assert0(vmi);
2433
2434 // Always round to os::vm_page_size(), which may be larger than 4K.
2435 size = align_size_up(size, os::vm_page_size());
2436 addr = (char *)align_ptr_up(addr, os::vm_page_size());
2437
2438 bool rc = false;
2439 bool remove_bookkeeping = false;
2440 if (vmi->type == VMEM_SHMATED) {
2441 // For shmatted memory, we do:
2442 // - If user wants to release the whole range, release the memory (shmdt).
2443 // - If user only wants to release a partial range, uncommit (disclaim) that
2444 // range. That way, at least, we do not use memory anymore (bust still page
2445 // table space).
2446 vmi->assert_is_valid_subrange(addr, size);
2447 if (addr == vmi->addr && size == vmi->size) {
2448 rc = release_shmated_memory(addr, size);
2449 remove_bookkeeping = true;
2450 } else {
2451 rc = uncommit_shmated_memory(addr, size);
2452 }
2453 } else {
2454 // User may unmap partial regions but region has to be fully contained.
2455 #ifdef ASSERT
2456 vmi->assert_is_valid_subrange(addr, size);
2457 #endif
2458 rc = release_mmaped_memory(addr, size);
2459 remove_bookkeeping = true;
2460 }
2461
2462 // update bookkeeping
2463 if (rc && remove_bookkeeping) {
2464 vmembk_remove(vmi);
2465 }
2466
2467 return rc;
2468 }
2469
2470 static bool checked_mprotect(char* addr, size_t size, int prot) {
2471
2472 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2473 // not tell me if protection failed when trying to protect an un-protectable range.
2474 //
2475 // This means if the memory was allocated using shmget/shmat, protection wont work
2476 // but mprotect will still return 0:
2477 //
2478 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2479
2480 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2481
2482 if (!rc) {
2483 const char* const s_errno = strerror(errno);
2484 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2485 return false;
2486 }
2487
2488 // mprotect success check
2489 //
2490 // Mprotect said it changed the protection but can I believe it?
2491 //
2492 // To be sure I need to check the protection afterwards. Try to
2493 // read from protected memory and check whether that causes a segfault.
2494 //
2495 if (!os::Aix::xpg_sus_mode()) {
2496
2497 if (CanUseSafeFetch32()) {
2498
2499 const bool read_protected =
2500 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2501 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2502
2503 if (prot & PROT_READ) {
2504 rc = !read_protected;
2505 } else {
2506 rc = read_protected;
2507 }
2508 }
2509 }
2510 if (!rc) {
2511 assert(false, "mprotect failed.");
2512 }
2513 return rc;
2514 }
2515
2516 // Set protections specified
2517 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2518 unsigned int p = 0;
2519 switch (prot) {
2520 case MEM_PROT_NONE: p = PROT_NONE; break;
2521 case MEM_PROT_READ: p = PROT_READ; break;
2522 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2523 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2524 default:
2525 ShouldNotReachHere();
2526 }
2527 // is_committed is unused.
2528 return checked_mprotect(addr, size, p);
2529 }
2530
2531 bool os::guard_memory(char* addr, size_t size) {
2532 return checked_mprotect(addr, size, PROT_NONE);
2533 }
2534
2535 bool os::unguard_memory(char* addr, size_t size) {
2536 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2537 }
2538
2539 // Large page support
2540
2541 static size_t _large_page_size = 0;
2542
2543 // Enable large page support if OS allows that.
2544 void os::large_page_init() {
2545 return; // Nothing to do. See query_multipage_support and friends.
2546 }
2547
2548 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2549 // "exec" is passed in but not used. Creating the shared image for
2550 // the code cache doesn't have an SHM_X executable permission to check.
2551 Unimplemented();
2552 return 0;
2553 }
2554
2555 bool os::release_memory_special(char* base, size_t bytes) {
2556 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2557 Unimplemented();
2558 return false;
2559 }
2560
2561 size_t os::large_page_size() {
2562 return _large_page_size;
2563 }
2564
2565 bool os::can_commit_large_page_memory() {
2566 // Does not matter, we do not support huge pages.
2567 return false;
2568 }
2569
2570 bool os::can_execute_large_page_memory() {
2571 // Does not matter, we do not support huge pages.
2572 return false;
2573 }
2574
2575 // Reserve memory at an arbitrary address, only if that area is
2576 // available (and not reserved for something else).
2577 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2578 char* addr = NULL;
2579
2580 // Always round to os::vm_page_size(), which may be larger than 4K.
2581 bytes = align_size_up(bytes, os::vm_page_size());
2582
2583 // In 4K mode always use mmap.
2584 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2585 if (os::vm_page_size() == SIZE_4K) {
2586 return reserve_mmaped_memory(bytes, requested_addr, 0);
2587 } else {
2588 if (bytes >= Use64KPagesThreshold) {
2589 return reserve_shmated_memory(bytes, requested_addr, 0);
2590 } else {
2591 return reserve_mmaped_memory(bytes, requested_addr, 0);
2592 }
2593 }
2594
2595 return addr;
2596 }
2597
2598 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2599 return ::read(fd, buf, nBytes);
2600 }
2601
2602 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2603 return ::pread(fd, buf, nBytes, offset);
2604 }
2605
2606 void os::naked_short_sleep(jlong ms) {
2607 struct timespec req;
2608
2609 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2610 req.tv_sec = 0;
2611 if (ms > 0) {
2612 req.tv_nsec = (ms % 1000) * 1000000;
2613 }
2614 else {
2615 req.tv_nsec = 1;
2616 }
2617
2618 nanosleep(&req, NULL);
2619
2620 return;
2621 }
2622
2623 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2624 void os::infinite_sleep() {
2625 while (true) { // sleep forever ...
2626 ::sleep(100); // ... 100 seconds at a time
2627 }
2628 }
2629
2630 // Used to convert frequent JVM_Yield() to nops
2631 bool os::dont_yield() {
2632 return DontYieldALot;
2633 }
2634
2635 void os::naked_yield() {
2636 sched_yield();
2637 }
2638
2639 ////////////////////////////////////////////////////////////////////////////////
2640 // thread priority support
2641
2642 // From AIX manpage to pthread_setschedparam
2643 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2644 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2645 //
2646 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2647 // range from 40 to 80, where 40 is the least favored priority and 80
2648 // is the most favored."
2649 //
2650 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2651 // scheduling there; however, this still leaves iSeries.)
2652 //
2653 // We use the same values for AIX and PASE.
2654 int os::java_to_os_priority[CriticalPriority + 1] = {
2655 54, // 0 Entry should never be used
2656
2657 55, // 1 MinPriority
2658 55, // 2
2659 56, // 3
2660
2661 56, // 4
2662 57, // 5 NormPriority
2663 57, // 6
2664
2665 58, // 7
2666 58, // 8
2667 59, // 9 NearMaxPriority
2668
2669 60, // 10 MaxPriority
2670
2671 60 // 11 CriticalPriority
2672 };
2673
2674 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2675 if (!UseThreadPriorities) return OS_OK;
2676 pthread_t thr = thread->osthread()->pthread_id();
2677 int policy = SCHED_OTHER;
2678 struct sched_param param;
2679 param.sched_priority = newpri;
2680 int ret = pthread_setschedparam(thr, policy, ¶m);
2681
2682 if (ret != 0) {
2683 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2684 (int)thr, newpri, ret, strerror(ret));
2685 }
2686 return (ret == 0) ? OS_OK : OS_ERR;
2687 }
2688
2689 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2690 if (!UseThreadPriorities) {
2691 *priority_ptr = java_to_os_priority[NormPriority];
2692 return OS_OK;
2693 }
2694 pthread_t thr = thread->osthread()->pthread_id();
2695 int policy = SCHED_OTHER;
2696 struct sched_param param;
2697 int ret = pthread_getschedparam(thr, &policy, ¶m);
2698 *priority_ptr = param.sched_priority;
2699
2700 return (ret == 0) ? OS_OK : OS_ERR;
2701 }
2702
2703 // Hint to the underlying OS that a task switch would not be good.
2704 // Void return because it's a hint and can fail.
2705 void os::hint_no_preempt() {}
2706
2707 ////////////////////////////////////////////////////////////////////////////////
2708 // suspend/resume support
2709
2710 // the low-level signal-based suspend/resume support is a remnant from the
2711 // old VM-suspension that used to be for java-suspension, safepoints etc,
2712 // within hotspot. Now there is a single use-case for this:
2713 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2714 // that runs in the watcher thread.
2715 // The remaining code is greatly simplified from the more general suspension
2716 // code that used to be used.
2717 //
2718 // The protocol is quite simple:
2719 // - suspend:
2720 // - sends a signal to the target thread
2721 // - polls the suspend state of the osthread using a yield loop
2722 // - target thread signal handler (SR_handler) sets suspend state
2723 // and blocks in sigsuspend until continued
2724 // - resume:
2725 // - sets target osthread state to continue
2726 // - sends signal to end the sigsuspend loop in the SR_handler
2727 //
2728 // Note that the SR_lock plays no role in this suspend/resume protocol.
2729 //
2730
2731 static void resume_clear_context(OSThread *osthread) {
2732 osthread->set_ucontext(NULL);
2733 osthread->set_siginfo(NULL);
2734 }
2735
2736 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2737 osthread->set_ucontext(context);
2738 osthread->set_siginfo(siginfo);
2739 }
2740
2741 //
2742 // Handler function invoked when a thread's execution is suspended or
2743 // resumed. We have to be careful that only async-safe functions are
2744 // called here (Note: most pthread functions are not async safe and
2745 // should be avoided.)
2746 //
2747 // Note: sigwait() is a more natural fit than sigsuspend() from an
2748 // interface point of view, but sigwait() prevents the signal hander
2749 // from being run. libpthread would get very confused by not having
2750 // its signal handlers run and prevents sigwait()'s use with the
2751 // mutex granting granting signal.
2752 //
2753 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2754 //
2755 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2756 // Save and restore errno to avoid confusing native code with EINTR
2757 // after sigsuspend.
2758 int old_errno = errno;
2759
2760 Thread* thread = Thread::current();
2761 OSThread* osthread = thread->osthread();
2762 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2763
2764 os::SuspendResume::State current = osthread->sr.state();
2765 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2766 suspend_save_context(osthread, siginfo, context);
2767
2768 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2769 os::SuspendResume::State state = osthread->sr.suspended();
2770 if (state == os::SuspendResume::SR_SUSPENDED) {
2771 sigset_t suspend_set; // signals for sigsuspend()
2772
2773 // get current set of blocked signals and unblock resume signal
2774 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2775 sigdelset(&suspend_set, SR_signum);
2776
2777 // wait here until we are resumed
2778 while (1) {
2779 sigsuspend(&suspend_set);
2780
2781 os::SuspendResume::State result = osthread->sr.running();
2782 if (result == os::SuspendResume::SR_RUNNING) {
2783 break;
2784 }
2785 }
2786
2787 } else if (state == os::SuspendResume::SR_RUNNING) {
2788 // request was cancelled, continue
2789 } else {
2790 ShouldNotReachHere();
2791 }
2792
2793 resume_clear_context(osthread);
2794 } else if (current == os::SuspendResume::SR_RUNNING) {
2795 // request was cancelled, continue
2796 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2797 // ignore
2798 } else {
2799 ShouldNotReachHere();
2800 }
2801
2802 errno = old_errno;
2803 }
2804
2805 static int SR_initialize() {
2806 struct sigaction act;
2807 char *s;
2808 // Get signal number to use for suspend/resume
2809 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2810 int sig = ::strtol(s, 0, 10);
2811 if (sig > 0 || sig < NSIG) {
2812 SR_signum = sig;
2813 }
2814 }
2815
2816 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2817 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2818
2819 sigemptyset(&SR_sigset);
2820 sigaddset(&SR_sigset, SR_signum);
2821
2822 // Set up signal handler for suspend/resume.
2823 act.sa_flags = SA_RESTART|SA_SIGINFO;
2824 act.sa_handler = (void (*)(int)) SR_handler;
2825
2826 // SR_signum is blocked by default.
2827 // 4528190 - We also need to block pthread restart signal (32 on all
2828 // supported Linux platforms). Note that LinuxThreads need to block
2829 // this signal for all threads to work properly. So we don't have
2830 // to use hard-coded signal number when setting up the mask.
2831 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2832
2833 if (sigaction(SR_signum, &act, 0) == -1) {
2834 return -1;
2835 }
2836
2837 // Save signal flag
2838 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2839 return 0;
2840 }
2841
2842 static int SR_finalize() {
2843 return 0;
2844 }
2845
2846 static int sr_notify(OSThread* osthread) {
2847 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2848 assert_status(status == 0, status, "pthread_kill");
2849 return status;
2850 }
2851
2852 // "Randomly" selected value for how long we want to spin
2853 // before bailing out on suspending a thread, also how often
2854 // we send a signal to a thread we want to resume
2855 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2856 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2857
2858 // returns true on success and false on error - really an error is fatal
2859 // but this seems the normal response to library errors
2860 static bool do_suspend(OSThread* osthread) {
2861 assert(osthread->sr.is_running(), "thread should be running");
2862 // mark as suspended and send signal
2863
2864 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2865 // failed to switch, state wasn't running?
2866 ShouldNotReachHere();
2867 return false;
2868 }
2869
2870 if (sr_notify(osthread) != 0) {
2871 // try to cancel, switch to running
2872
2873 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2874 if (result == os::SuspendResume::SR_RUNNING) {
2875 // cancelled
2876 return false;
2877 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2878 // somehow managed to suspend
2879 return true;
2880 } else {
2881 ShouldNotReachHere();
2882 return false;
2883 }
2884 }
2885
2886 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2887
2888 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2889 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2890 os::naked_yield();
2891 }
2892
2893 // timeout, try to cancel the request
2894 if (n >= RANDOMLY_LARGE_INTEGER) {
2895 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2896 if (cancelled == os::SuspendResume::SR_RUNNING) {
2897 return false;
2898 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2899 return true;
2900 } else {
2901 ShouldNotReachHere();
2902 return false;
2903 }
2904 }
2905 }
2906
2907 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2908 return true;
2909 }
2910
2911 static void do_resume(OSThread* osthread) {
2912 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2913
2914 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2915 // failed to switch to WAKEUP_REQUEST
2916 ShouldNotReachHere();
2917 return;
2918 }
2919
2920 while (!osthread->sr.is_running()) {
2921 if (sr_notify(osthread) == 0) {
2922 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2923 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2924 os::naked_yield();
2925 }
2926 }
2927 } else {
2928 ShouldNotReachHere();
2929 }
2930 }
2931
2932 guarantee(osthread->sr.is_running(), "Must be running!");
2933 }
2934
2935 ///////////////////////////////////////////////////////////////////////////////////
2936 // signal handling (except suspend/resume)
2937
2938 // This routine may be used by user applications as a "hook" to catch signals.
2939 // The user-defined signal handler must pass unrecognized signals to this
2940 // routine, and if it returns true (non-zero), then the signal handler must
2941 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2942 // routine will never retun false (zero), but instead will execute a VM panic
2943 // routine kill the process.
2944 //
2945 // If this routine returns false, it is OK to call it again. This allows
2946 // the user-defined signal handler to perform checks either before or after
2947 // the VM performs its own checks. Naturally, the user code would be making
2948 // a serious error if it tried to handle an exception (such as a null check
2949 // or breakpoint) that the VM was generating for its own correct operation.
2950 //
2951 // This routine may recognize any of the following kinds of signals:
2952 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2953 // It should be consulted by handlers for any of those signals.
2954 //
2955 // The caller of this routine must pass in the three arguments supplied
2956 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2957 // field of the structure passed to sigaction(). This routine assumes that
2958 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2959 //
2960 // Note that the VM will print warnings if it detects conflicting signal
2961 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2962 //
2963 extern "C" JNIEXPORT int
2964 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2965
2966 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2967 // to be the thing to call; documentation is not terribly clear about whether
2968 // pthread_sigmask also works, and if it does, whether it does the same.
2969 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2970 const int rc = ::pthread_sigmask(how, set, oset);
2971 // return value semantics differ slightly for error case:
2972 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2973 // (so, pthread_sigmask is more theadsafe for error handling)
2974 // But success is always 0.
2975 return rc == 0 ? true : false;
2976 }
2977
2978 // Function to unblock all signals which are, according
2979 // to POSIX, typical program error signals. If they happen while being blocked,
2980 // they typically will bring down the process immediately.
2981 bool unblock_program_error_signals() {
2982 sigset_t set;
2983 ::sigemptyset(&set);
2984 ::sigaddset(&set, SIGILL);
2985 ::sigaddset(&set, SIGBUS);
2986 ::sigaddset(&set, SIGFPE);
2987 ::sigaddset(&set, SIGSEGV);
2988 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2989 }
2990
2991 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2992 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2993 assert(info != NULL && uc != NULL, "it must be old kernel");
2994
2995 // Never leave program error signals blocked;
2996 // on all our platforms they would bring down the process immediately when
2997 // getting raised while being blocked.
2998 unblock_program_error_signals();
2999
3000 JVM_handle_aix_signal(sig, info, uc, true);
3001 }
3002
3003 // This boolean allows users to forward their own non-matching signals
3004 // to JVM_handle_aix_signal, harmlessly.
3005 bool os::Aix::signal_handlers_are_installed = false;
3006
3007 // For signal-chaining
3008 struct sigaction os::Aix::sigact[MAXSIGNUM];
3009 unsigned int os::Aix::sigs = 0;
3010 bool os::Aix::libjsig_is_loaded = false;
3011 typedef struct sigaction *(*get_signal_t)(int);
3012 get_signal_t os::Aix::get_signal_action = NULL;
3013
3014 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3015 struct sigaction *actp = NULL;
3016
3017 if (libjsig_is_loaded) {
3018 // Retrieve the old signal handler from libjsig
3019 actp = (*get_signal_action)(sig);
3020 }
3021 if (actp == NULL) {
3022 // Retrieve the preinstalled signal handler from jvm
3023 actp = get_preinstalled_handler(sig);
3024 }
3025
3026 return actp;
3027 }
3028
3029 static bool call_chained_handler(struct sigaction *actp, int sig,
3030 siginfo_t *siginfo, void *context) {
3031 // Call the old signal handler
3032 if (actp->sa_handler == SIG_DFL) {
3033 // It's more reasonable to let jvm treat it as an unexpected exception
3034 // instead of taking the default action.
3035 return false;
3036 } else if (actp->sa_handler != SIG_IGN) {
3037 if ((actp->sa_flags & SA_NODEFER) == 0) {
3038 // automaticlly block the signal
3039 sigaddset(&(actp->sa_mask), sig);
3040 }
3041
3042 sa_handler_t hand = NULL;
3043 sa_sigaction_t sa = NULL;
3044 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3045 // retrieve the chained handler
3046 if (siginfo_flag_set) {
3047 sa = actp->sa_sigaction;
3048 } else {
3049 hand = actp->sa_handler;
3050 }
3051
3052 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3053 actp->sa_handler = SIG_DFL;
3054 }
3055
3056 // try to honor the signal mask
3057 sigset_t oset;
3058 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3059
3060 // call into the chained handler
3061 if (siginfo_flag_set) {
3062 (*sa)(sig, siginfo, context);
3063 } else {
3064 (*hand)(sig);
3065 }
3066
3067 // restore the signal mask
3068 pthread_sigmask(SIG_SETMASK, &oset, 0);
3069 }
3070 // Tell jvm's signal handler the signal is taken care of.
3071 return true;
3072 }
3073
3074 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3075 bool chained = false;
3076 // signal-chaining
3077 if (UseSignalChaining) {
3078 struct sigaction *actp = get_chained_signal_action(sig);
3079 if (actp != NULL) {
3080 chained = call_chained_handler(actp, sig, siginfo, context);
3081 }
3082 }
3083 return chained;
3084 }
3085
3086 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3087 if ((((unsigned int)1 << sig) & sigs) != 0) {
3088 return &sigact[sig];
3089 }
3090 return NULL;
3091 }
3092
3093 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3094 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3095 sigact[sig] = oldAct;
3096 sigs |= (unsigned int)1 << sig;
3097 }
3098
3099 // for diagnostic
3100 int os::Aix::sigflags[MAXSIGNUM];
3101
3102 int os::Aix::get_our_sigflags(int sig) {
3103 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3104 return sigflags[sig];
3105 }
3106
3107 void os::Aix::set_our_sigflags(int sig, int flags) {
3108 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3109 sigflags[sig] = flags;
3110 }
3111
3112 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3113 // Check for overwrite.
3114 struct sigaction oldAct;
3115 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3116
3117 void* oldhand = oldAct.sa_sigaction
3118 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3119 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3120 // Renamed 'signalHandler' to avoid collision with other shared libs.
3121 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3122 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3123 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3124 if (AllowUserSignalHandlers || !set_installed) {
3125 // Do not overwrite; user takes responsibility to forward to us.
3126 return;
3127 } else if (UseSignalChaining) {
3128 // save the old handler in jvm
3129 save_preinstalled_handler(sig, oldAct);
3130 // libjsig also interposes the sigaction() call below and saves the
3131 // old sigaction on it own.
3132 } else {
3133 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3134 "%#lx for signal %d.", (long)oldhand, sig));
3135 }
3136 }
3137
3138 struct sigaction sigAct;
3139 sigfillset(&(sigAct.sa_mask));
3140 if (!set_installed) {
3141 sigAct.sa_handler = SIG_DFL;
3142 sigAct.sa_flags = SA_RESTART;
3143 } else {
3144 // Renamed 'signalHandler' to avoid collision with other shared libs.
3145 sigAct.sa_sigaction = javaSignalHandler;
3146 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3147 }
3148 // Save flags, which are set by ours
3149 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3150 sigflags[sig] = sigAct.sa_flags;
3151
3152 int ret = sigaction(sig, &sigAct, &oldAct);
3153 assert(ret == 0, "check");
3154
3155 void* oldhand2 = oldAct.sa_sigaction
3156 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3157 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3158 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3159 }
3160
3161 // install signal handlers for signals that HotSpot needs to
3162 // handle in order to support Java-level exception handling.
3163 void os::Aix::install_signal_handlers() {
3164 if (!signal_handlers_are_installed) {
3165 signal_handlers_are_installed = true;
3166
3167 // signal-chaining
3168 typedef void (*signal_setting_t)();
3169 signal_setting_t begin_signal_setting = NULL;
3170 signal_setting_t end_signal_setting = NULL;
3171 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3172 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3173 if (begin_signal_setting != NULL) {
3174 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3175 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3176 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3177 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3178 libjsig_is_loaded = true;
3179 assert(UseSignalChaining, "should enable signal-chaining");
3180 }
3181 if (libjsig_is_loaded) {
3182 // Tell libjsig jvm is setting signal handlers
3183 (*begin_signal_setting)();
3184 }
3185
3186 set_signal_handler(SIGSEGV, true);
3187 set_signal_handler(SIGPIPE, true);
3188 set_signal_handler(SIGBUS, true);
3189 set_signal_handler(SIGILL, true);
3190 set_signal_handler(SIGFPE, true);
3191 set_signal_handler(SIGTRAP, true);
3192 set_signal_handler(SIGXFSZ, true);
3193 set_signal_handler(SIGDANGER, true);
3194
3195 if (libjsig_is_loaded) {
3196 // Tell libjsig jvm finishes setting signal handlers.
3197 (*end_signal_setting)();
3198 }
3199
3200 // We don't activate signal checker if libjsig is in place, we trust ourselves
3201 // and if UserSignalHandler is installed all bets are off.
3202 // Log that signal checking is off only if -verbose:jni is specified.
3203 if (CheckJNICalls) {
3204 if (libjsig_is_loaded) {
3205 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3206 check_signals = false;
3207 }
3208 if (AllowUserSignalHandlers) {
3209 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3210 check_signals = false;
3211 }
3212 // Need to initialize check_signal_done.
3213 ::sigemptyset(&check_signal_done);
3214 }
3215 }
3216 }
3217
3218 static const char* get_signal_handler_name(address handler,
3219 char* buf, int buflen) {
3220 int offset;
3221 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3222 if (found) {
3223 // skip directory names
3224 const char *p1, *p2;
3225 p1 = buf;
3226 size_t len = strlen(os::file_separator());
3227 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3228 // The way os::dll_address_to_library_name is implemented on Aix
3229 // right now, it always returns -1 for the offset which is not
3230 // terribly informative.
3231 // Will fix that. For now, omit the offset.
3232 jio_snprintf(buf, buflen, "%s", p1);
3233 } else {
3234 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3235 }
3236 return buf;
3237 }
3238
3239 static void print_signal_handler(outputStream* st, int sig,
3240 char* buf, size_t buflen) {
3241 struct sigaction sa;
3242 sigaction(sig, NULL, &sa);
3243
3244 st->print("%s: ", os::exception_name(sig, buf, buflen));
3245
3246 address handler = (sa.sa_flags & SA_SIGINFO)
3247 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3248 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3249
3250 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3251 st->print("SIG_DFL");
3252 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3253 st->print("SIG_IGN");
3254 } else {
3255 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3256 }
3257
3258 // Print readable mask.
3259 st->print(", sa_mask[0]=");
3260 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3261
3262 address rh = VMError::get_resetted_sighandler(sig);
3263 // May be, handler was resetted by VMError?
3264 if (rh != NULL) {
3265 handler = rh;
3266 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3267 }
3268
3269 // Print textual representation of sa_flags.
3270 st->print(", sa_flags=");
3271 os::Posix::print_sa_flags(st, sa.sa_flags);
3272
3273 // Check: is it our handler?
3274 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3275 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3276 // It is our signal handler.
3277 // Check for flags, reset system-used one!
3278 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3279 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3280 os::Aix::get_our_sigflags(sig));
3281 }
3282 }
3283 st->cr();
3284 }
3285
3286 #define DO_SIGNAL_CHECK(sig) \
3287 if (!sigismember(&check_signal_done, sig)) \
3288 os::Aix::check_signal_handler(sig)
3289
3290 // This method is a periodic task to check for misbehaving JNI applications
3291 // under CheckJNI, we can add any periodic checks here
3292
3293 void os::run_periodic_checks() {
3294
3295 if (check_signals == false) return;
3296
3297 // SEGV and BUS if overridden could potentially prevent
3298 // generation of hs*.log in the event of a crash, debugging
3299 // such a case can be very challenging, so we absolutely
3300 // check the following for a good measure:
3301 DO_SIGNAL_CHECK(SIGSEGV);
3302 DO_SIGNAL_CHECK(SIGILL);
3303 DO_SIGNAL_CHECK(SIGFPE);
3304 DO_SIGNAL_CHECK(SIGBUS);
3305 DO_SIGNAL_CHECK(SIGPIPE);
3306 DO_SIGNAL_CHECK(SIGXFSZ);
3307 if (UseSIGTRAP) {
3308 DO_SIGNAL_CHECK(SIGTRAP);
3309 }
3310 DO_SIGNAL_CHECK(SIGDANGER);
3311
3312 // ReduceSignalUsage allows the user to override these handlers
3313 // see comments at the very top and jvm_solaris.h
3314 if (!ReduceSignalUsage) {
3315 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3316 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3317 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3318 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3319 }
3320
3321 DO_SIGNAL_CHECK(SR_signum);
3322 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3323 }
3324
3325 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3326
3327 static os_sigaction_t os_sigaction = NULL;
3328
3329 void os::Aix::check_signal_handler(int sig) {
3330 char buf[O_BUFLEN];
3331 address jvmHandler = NULL;
3332
3333 struct sigaction act;
3334 if (os_sigaction == NULL) {
3335 // only trust the default sigaction, in case it has been interposed
3336 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3337 if (os_sigaction == NULL) return;
3338 }
3339
3340 os_sigaction(sig, (struct sigaction*)NULL, &act);
3341
3342 address thisHandler = (act.sa_flags & SA_SIGINFO)
3343 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3344 : CAST_FROM_FN_PTR(address, act.sa_handler);
3345
3346 switch(sig) {
3347 case SIGSEGV:
3348 case SIGBUS:
3349 case SIGFPE:
3350 case SIGPIPE:
3351 case SIGILL:
3352 case SIGXFSZ:
3353 // Renamed 'signalHandler' to avoid collision with other shared libs.
3354 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3355 break;
3356
3357 case SHUTDOWN1_SIGNAL:
3358 case SHUTDOWN2_SIGNAL:
3359 case SHUTDOWN3_SIGNAL:
3360 case BREAK_SIGNAL:
3361 jvmHandler = (address)user_handler();
3362 break;
3363
3364 case INTERRUPT_SIGNAL:
3365 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3366 break;
3367
3368 default:
3369 if (sig == SR_signum) {
3370 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3371 } else {
3372 return;
3373 }
3374 break;
3375 }
3376
3377 if (thisHandler != jvmHandler) {
3378 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3379 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3380 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3381 // No need to check this sig any longer
3382 sigaddset(&check_signal_done, sig);
3383 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3384 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3385 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3386 exception_name(sig, buf, O_BUFLEN));
3387 }
3388 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3389 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3390 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3391 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3392 // No need to check this sig any longer
3393 sigaddset(&check_signal_done, sig);
3394 }
3395
3396 // Dump all the signal
3397 if (sigismember(&check_signal_done, sig)) {
3398 print_signal_handlers(tty, buf, O_BUFLEN);
3399 }
3400 }
3401
3402 extern bool signal_name(int signo, char* buf, size_t len);
3403
3404 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3405 if (0 < exception_code && exception_code <= SIGRTMAX) {
3406 // signal
3407 if (!signal_name(exception_code, buf, size)) {
3408 jio_snprintf(buf, size, "SIG%d", exception_code);
3409 }
3410 return buf;
3411 } else {
3412 return NULL;
3413 }
3414 }
3415
3416 // To install functions for atexit system call
3417 extern "C" {
3418 static void perfMemory_exit_helper() {
3419 perfMemory_exit();
3420 }
3421 }
3422
3423 // This is called _before_ the most of global arguments have been parsed.
3424 void os::init(void) {
3425 // This is basic, we want to know if that ever changes.
3426 // (Shared memory boundary is supposed to be a 256M aligned.)
3427 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3428
3429 // First off, we need to know whether we run on AIX or PASE, and
3430 // the OS level we run on.
3431 os::Aix::initialize_os_info();
3432
3433 // Scan environment (SPEC1170 behaviour, etc).
3434 os::Aix::scan_environment();
3435
3436 // Check which pages are supported by AIX.
3437 query_multipage_support();
3438
3439 // Act like we only have one page size by eliminating corner cases which
3440 // we did not support very well anyway.
3441 // We have two input conditions:
3442 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3443 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3444 // setting.
3445 // Data segment page size is important for us because it defines the thread stack page
3446 // size, which is needed for guard page handling, stack banging etc.
3447 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3448 // and should be allocated with 64k pages.
3449 //
3450 // So, we do the following:
3451 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3452 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3453 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3454 // 64k no --- AIX 5.2 ? ---
3455 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3456
3457 // We explicitly leave no option to change page size, because only upgrading would work,
3458 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3459
3460 if (g_multipage_support.datapsize == SIZE_4K) {
3461 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3462 if (g_multipage_support.can_use_64K_pages) {
3463 // .. but we are able to use 64K pages dynamically.
3464 // This would be typical for java launchers which are not linked
3465 // with datapsize=64K (like, any other launcher but our own).
3466 //
3467 // In this case it would be smart to allocate the java heap with 64K
3468 // to get the performance benefit, and to fake 64k pages for the
3469 // data segment (when dealing with thread stacks).
3470 //
3471 // However, leave a possibility to downgrade to 4K, using
3472 // -XX:-Use64KPages.
3473 if (Use64KPages) {
3474 trcVerbose("64K page mode (faked for data segment)");
3475 Aix::_page_size = SIZE_64K;
3476 } else {
3477 trcVerbose("4K page mode (Use64KPages=off)");
3478 Aix::_page_size = SIZE_4K;
3479 }
3480 } else {
3481 // .. and not able to allocate 64k pages dynamically. Here, just
3482 // fall back to 4K paged mode and use mmap for everything.
3483 trcVerbose("4K page mode");
3484 Aix::_page_size = SIZE_4K;
3485 FLAG_SET_ERGO(bool, Use64KPages, false);
3486 }
3487 } else {
3488 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3489 // This normally means that we can allocate 64k pages dynamically.
3490 // (There is one special case where this may be false: EXTSHM=on.
3491 // but we decided to not support that mode).
3492 assert0(g_multipage_support.can_use_64K_pages);
3493 Aix::_page_size = SIZE_64K;
3494 trcVerbose("64K page mode");
3495 FLAG_SET_ERGO(bool, Use64KPages, true);
3496 }
3497
3498 // Short-wire stack page size to base page size; if that works, we just remove
3499 // that stack page size altogether.
3500 Aix::_stack_page_size = Aix::_page_size;
3501
3502 // For now UseLargePages is just ignored.
3503 FLAG_SET_ERGO(bool, UseLargePages, false);
3504 _page_sizes[0] = 0;
3505 _large_page_size = -1;
3506
3507 // debug trace
3508 trcVerbose("os::vm_page_size %s\n", describe_pagesize(os::vm_page_size()));
3509
3510 // Next, we need to initialize libo4 and libperfstat libraries.
3511 if (os::Aix::on_pase()) {
3512 os::Aix::initialize_libo4();
3513 } else {
3514 os::Aix::initialize_libperfstat();
3515 }
3516
3517 // Reset the perfstat information provided by ODM.
3518 if (os::Aix::on_aix()) {
3519 libperfstat::perfstat_reset();
3520 }
3521
3522 // Now initialze basic system properties. Note that for some of the values we
3523 // need libperfstat etc.
3524 os::Aix::initialize_system_info();
3525
3526 _initial_pid = getpid();
3527
3528 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3529
3530 init_random(1234567);
3531
3532 ThreadCritical::initialize();
3533
3534 // Main_thread points to the aboriginal thread.
3535 Aix::_main_thread = pthread_self();
3536
3537 initial_time_count = os::elapsed_counter();
3538
3539 // If the pagesize of the VM is greater than 8K determine the appropriate
3540 // number of initial guard pages. The user can change this with the
3541 // command line arguments, if needed.
3542 if (vm_page_size() > (int)Aix::vm_default_page_size()) {
3543 StackYellowPages = 1;
3544 StackRedPages = 1;
3545 StackShadowPages = round_to((StackShadowPages*Aix::vm_default_page_size()), vm_page_size()) / vm_page_size();
3546 }
3547 }
3548
3549 // This is called _after_ the global arguments have been parsed.
3550 jint os::init_2(void) {
3551
3552 trcVerbose("processor count: %d", os::_processor_count);
3553 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3554
3555 // Initially build up the loaded dll map.
3556 LoadedLibraries::reload();
3557
3558 const int page_size = Aix::page_size();
3559 const int map_size = page_size;
3560
3561 address map_address = (address) MAP_FAILED;
3562 const int prot = PROT_READ;
3563 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3564
3565 // Use optimized addresses for the polling page,
3566 // e.g. map it to a special 32-bit address.
3567 if (OptimizePollingPageLocation) {
3568 // architecture-specific list of address wishes:
3569 address address_wishes[] = {
3570 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3571 // PPC64: all address wishes are non-negative 32 bit values where
3572 // the lower 16 bits are all zero. we can load these addresses
3573 // with a single ppc_lis instruction.
3574 (address) 0x30000000, (address) 0x31000000,
3575 (address) 0x32000000, (address) 0x33000000,
3576 (address) 0x40000000, (address) 0x41000000,
3577 (address) 0x42000000, (address) 0x43000000,
3578 (address) 0x50000000, (address) 0x51000000,
3579 (address) 0x52000000, (address) 0x53000000,
3580 (address) 0x60000000, (address) 0x61000000,
3581 (address) 0x62000000, (address) 0x63000000
3582 };
3583 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3584
3585 // iterate over the list of address wishes:
3586 for (int i=0; i<address_wishes_length; i++) {
3587 // Try to map with current address wish.
3588 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3589 // fail if the address is already mapped.
3590 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3591 map_size, prot,
3592 flags | MAP_FIXED,
3593 -1, 0);
3594 if (Verbose) {
3595 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3596 address_wishes[i], map_address + (ssize_t)page_size);
3597 }
3598
3599 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3600 // Map succeeded and map_address is at wished address, exit loop.
3601 break;
3602 }
3603
3604 if (map_address != (address) MAP_FAILED) {
3605 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3606 ::munmap(map_address, map_size);
3607 map_address = (address) MAP_FAILED;
3608 }
3609 // Map failed, continue loop.
3610 }
3611 } // end OptimizePollingPageLocation
3612
3613 if (map_address == (address) MAP_FAILED) {
3614 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3615 }
3616 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3617 os::set_polling_page(map_address);
3618
3619 if (!UseMembar) {
3620 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3621 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3622 os::set_memory_serialize_page(mem_serialize_page);
3623
3624 #ifndef PRODUCT
3625 if (Verbose && PrintMiscellaneous) {
3626 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3627 }
3628 #endif
3629 }
3630
3631 // initialize suspend/resume support - must do this before signal_sets_init()
3632 if (SR_initialize() != 0) {
3633 perror("SR_initialize failed");
3634 return JNI_ERR;
3635 }
3636
3637 Aix::signal_sets_init();
3638 Aix::install_signal_handlers();
3639
3640 // Check minimum allowable stack size for thread creation and to initialize
3641 // the java system classes, including StackOverflowError - depends on page
3642 // size. Add a page for compiler2 recursion in main thread.
3643 // Add in 2*BytesPerWord times page size to account for VM stack during
3644 // class initialization depending on 32 or 64 bit VM.
3645 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3646 (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Aix::page_size() +
3647 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::vm_default_page_size());
3648
3649 os::Aix::min_stack_allowed = align_size_up(os::Aix::min_stack_allowed, os::Aix::page_size());
3650
3651 size_t threadStackSizeInBytes = ThreadStackSize * K;
3652 if (threadStackSizeInBytes != 0 &&
3653 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3654 tty->print_cr("\nThe stack size specified is too small, "
3655 "Specify at least %dk",
3656 os::Aix::min_stack_allowed / K);
3657 return JNI_ERR;
3658 }
3659
3660 // Make the stack size a multiple of the page size so that
3661 // the yellow/red zones can be guarded.
3662 // Note that this can be 0, if no default stacksize was set.
3663 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3664
3665 Aix::libpthread_init();
3666
3667 if (MaxFDLimit) {
3668 // Set the number of file descriptors to max. print out error
3669 // if getrlimit/setrlimit fails but continue regardless.
3670 struct rlimit nbr_files;
3671 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3672 if (status != 0) {
3673 if (PrintMiscellaneous && (Verbose || WizardMode))
3674 perror("os::init_2 getrlimit failed");
3675 } else {
3676 nbr_files.rlim_cur = nbr_files.rlim_max;
3677 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3678 if (status != 0) {
3679 if (PrintMiscellaneous && (Verbose || WizardMode))
3680 perror("os::init_2 setrlimit failed");
3681 }
3682 }
3683 }
3684
3685 if (PerfAllowAtExitRegistration) {
3686 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3687 // Atexit functions can be delayed until process exit time, which
3688 // can be problematic for embedded VM situations. Embedded VMs should
3689 // call DestroyJavaVM() to assure that VM resources are released.
3690
3691 // Note: perfMemory_exit_helper atexit function may be removed in
3692 // the future if the appropriate cleanup code can be added to the
3693 // VM_Exit VMOperation's doit method.
3694 if (atexit(perfMemory_exit_helper) != 0) {
3695 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3696 }
3697 }
3698
3699 return JNI_OK;
3700 }
3701
3702 // Mark the polling page as unreadable
3703 void os::make_polling_page_unreadable(void) {
3704 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3705 fatal("Could not disable polling page");
3706 }
3707 };
3708
3709 // Mark the polling page as readable
3710 void os::make_polling_page_readable(void) {
3711 // Changed according to os_linux.cpp.
3712 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3713 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
3714 }
3715 };
3716
3717 int os::active_processor_count() {
3718 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3719 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3720 return online_cpus;
3721 }
3722
3723 void os::set_native_thread_name(const char *name) {
3724 // Not yet implemented.
3725 return;
3726 }
3727
3728 bool os::distribute_processes(uint length, uint* distribution) {
3729 // Not yet implemented.
3730 return false;
3731 }
3732
3733 bool os::bind_to_processor(uint processor_id) {
3734 // Not yet implemented.
3735 return false;
3736 }
3737
3738 void os::SuspendedThreadTask::internal_do_task() {
3739 if (do_suspend(_thread->osthread())) {
3740 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3741 do_task(context);
3742 do_resume(_thread->osthread());
3743 }
3744 }
3745
3746 class PcFetcher : public os::SuspendedThreadTask {
3747 public:
3748 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3749 ExtendedPC result();
3750 protected:
3751 void do_task(const os::SuspendedThreadTaskContext& context);
3752 private:
3753 ExtendedPC _epc;
3754 };
3755
3756 ExtendedPC PcFetcher::result() {
3757 guarantee(is_done(), "task is not done yet.");
3758 return _epc;
3759 }
3760
3761 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3762 Thread* thread = context.thread();
3763 OSThread* osthread = thread->osthread();
3764 if (osthread->ucontext() != NULL) {
3765 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3766 } else {
3767 // NULL context is unexpected, double-check this is the VMThread.
3768 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3769 }
3770 }
3771
3772 // Suspends the target using the signal mechanism and then grabs the PC before
3773 // resuming the target. Used by the flat-profiler only
3774 ExtendedPC os::get_thread_pc(Thread* thread) {
3775 // Make sure that it is called by the watcher for the VMThread.
3776 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3777 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3778
3779 PcFetcher fetcher(thread);
3780 fetcher.run();
3781 return fetcher.result();
3782 }
3783
3784 ////////////////////////////////////////////////////////////////////////////////
3785 // debug support
3786
3787 static address same_page(address x, address y) {
3788 intptr_t page_bits = -os::vm_page_size();
3789 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3790 return x;
3791 else if (x > y)
3792 return (address)(intptr_t(y) | ~page_bits) + 1;
3793 else
3794 return (address)(intptr_t(y) & page_bits);
3795 }
3796
3797 bool os::find(address addr, outputStream* st) {
3798
3799 st->print(PTR_FORMAT ": ", addr);
3800
3801 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3802 if (lib) {
3803 lib->print(st);
3804 return true;
3805 } else {
3806 lib = LoadedLibraries::find_for_data_address(addr);
3807 if (lib) {
3808 lib->print(st);
3809 return true;
3810 } else {
3811 st->print_cr("(outside any module)");
3812 }
3813 }
3814
3815 return false;
3816 }
3817
3818 ////////////////////////////////////////////////////////////////////////////////
3819 // misc
3820
3821 // This does not do anything on Aix. This is basically a hook for being
3822 // able to use structured exception handling (thread-local exception filters)
3823 // on, e.g., Win32.
3824 void
3825 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3826 JavaCallArguments* args, Thread* thread) {
3827 f(value, method, args, thread);
3828 }
3829
3830 void os::print_statistics() {
3831 }
3832
3833 int os::message_box(const char* title, const char* message) {
3834 int i;
3835 fdStream err(defaultStream::error_fd());
3836 for (i = 0; i < 78; i++) err.print_raw("=");
3837 err.cr();
3838 err.print_raw_cr(title);
3839 for (i = 0; i < 78; i++) err.print_raw("-");
3840 err.cr();
3841 err.print_raw_cr(message);
3842 for (i = 0; i < 78; i++) err.print_raw("=");
3843 err.cr();
3844
3845 char buf[16];
3846 // Prevent process from exiting upon "read error" without consuming all CPU
3847 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3848
3849 return buf[0] == 'y' || buf[0] == 'Y';
3850 }
3851
3852 int os::stat(const char *path, struct stat *sbuf) {
3853 char pathbuf[MAX_PATH];
3854 if (strlen(path) > MAX_PATH - 1) {
3855 errno = ENAMETOOLONG;
3856 return -1;
3857 }
3858 os::native_path(strcpy(pathbuf, path));
3859 return ::stat(pathbuf, sbuf);
3860 }
3861
3862 bool os::check_heap(bool force) {
3863 return true;
3864 }
3865
3866 // Is a (classpath) directory empty?
3867 bool os::dir_is_empty(const char* path) {
3868 DIR *dir = NULL;
3869 struct dirent *ptr;
3870
3871 dir = opendir(path);
3872 if (dir == NULL) return true;
3873
3874 /* Scan the directory */
3875 bool result = true;
3876 char buf[sizeof(struct dirent) + MAX_PATH];
3877 while (result && (ptr = ::readdir(dir)) != NULL) {
3878 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3879 result = false;
3880 }
3881 }
3882 closedir(dir);
3883 return result;
3884 }
3885
3886 // This code originates from JDK's sysOpen and open64_w
3887 // from src/solaris/hpi/src/system_md.c
3888
3889 int os::open(const char *path, int oflag, int mode) {
3890
3891 if (strlen(path) > MAX_PATH - 1) {
3892 errno = ENAMETOOLONG;
3893 return -1;
3894 }
3895 int fd;
3896
3897 fd = ::open64(path, oflag, mode);
3898 if (fd == -1) return -1;
3899
3900 // If the open succeeded, the file might still be a directory.
3901 {
3902 struct stat64 buf64;
3903 int ret = ::fstat64(fd, &buf64);
3904 int st_mode = buf64.st_mode;
3905
3906 if (ret != -1) {
3907 if ((st_mode & S_IFMT) == S_IFDIR) {
3908 errno = EISDIR;
3909 ::close(fd);
3910 return -1;
3911 }
3912 } else {
3913 ::close(fd);
3914 return -1;
3915 }
3916 }
3917
3918 // All file descriptors that are opened in the JVM and not
3919 // specifically destined for a subprocess should have the
3920 // close-on-exec flag set. If we don't set it, then careless 3rd
3921 // party native code might fork and exec without closing all
3922 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3923 // UNIXProcess.c), and this in turn might:
3924 //
3925 // - cause end-of-file to fail to be detected on some file
3926 // descriptors, resulting in mysterious hangs, or
3927 //
3928 // - might cause an fopen in the subprocess to fail on a system
3929 // suffering from bug 1085341.
3930 //
3931 // (Yes, the default setting of the close-on-exec flag is a Unix
3932 // design flaw.)
3933 //
3934 // See:
3935 // 1085341: 32-bit stdio routines should support file descriptors >255
3936 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3937 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3938 #ifdef FD_CLOEXEC
3939 {
3940 int flags = ::fcntl(fd, F_GETFD);
3941 if (flags != -1)
3942 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3943 }
3944 #endif
3945
3946 return fd;
3947 }
3948
3949 // create binary file, rewriting existing file if required
3950 int os::create_binary_file(const char* path, bool rewrite_existing) {
3951 int oflags = O_WRONLY | O_CREAT;
3952 if (!rewrite_existing) {
3953 oflags |= O_EXCL;
3954 }
3955 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3956 }
3957
3958 // return current position of file pointer
3959 jlong os::current_file_offset(int fd) {
3960 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3961 }
3962
3963 // move file pointer to the specified offset
3964 jlong os::seek_to_file_offset(int fd, jlong offset) {
3965 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3966 }
3967
3968 // This code originates from JDK's sysAvailable
3969 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3970
3971 int os::available(int fd, jlong *bytes) {
3972 jlong cur, end;
3973 int mode;
3974 struct stat64 buf64;
3975
3976 if (::fstat64(fd, &buf64) >= 0) {
3977 mode = buf64.st_mode;
3978 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3979 // XXX: is the following call interruptible? If so, this might
3980 // need to go through the INTERRUPT_IO() wrapper as for other
3981 // blocking, interruptible calls in this file.
3982 int n;
3983 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3984 *bytes = n;
3985 return 1;
3986 }
3987 }
3988 }
3989 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3990 return 0;
3991 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3992 return 0;
3993 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3994 return 0;
3995 }
3996 *bytes = end - cur;
3997 return 1;
3998 }
3999
4000 // Map a block of memory.
4001 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
4002 char *addr, size_t bytes, bool read_only,
4003 bool allow_exec) {
4004 int prot;
4005 int flags = MAP_PRIVATE;
4006
4007 if (read_only) {
4008 prot = PROT_READ;
4009 flags = MAP_SHARED;
4010 } else {
4011 prot = PROT_READ | PROT_WRITE;
4012 flags = MAP_PRIVATE;
4013 }
4014
4015 if (allow_exec) {
4016 prot |= PROT_EXEC;
4017 }
4018
4019 if (addr != NULL) {
4020 flags |= MAP_FIXED;
4021 }
4022
4023 // Allow anonymous mappings if 'fd' is -1.
4024 if (fd == -1) {
4025 flags |= MAP_ANONYMOUS;
4026 }
4027
4028 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
4029 fd, file_offset);
4030 if (mapped_address == MAP_FAILED) {
4031 return NULL;
4032 }
4033 return mapped_address;
4034 }
4035
4036 // Remap a block of memory.
4037 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4038 char *addr, size_t bytes, bool read_only,
4039 bool allow_exec) {
4040 // same as map_memory() on this OS
4041 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4042 allow_exec);
4043 }
4044
4045 // Unmap a block of memory.
4046 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4047 return munmap(addr, bytes) == 0;
4048 }
4049
4050 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4051 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4052 // of a thread.
4053 //
4054 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4055 // the fast estimate available on the platform.
4056
4057 jlong os::current_thread_cpu_time() {
4058 // return user + sys since the cost is the same
4059 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4060 assert(n >= 0, "negative CPU time");
4061 return n;
4062 }
4063
4064 jlong os::thread_cpu_time(Thread* thread) {
4065 // consistent with what current_thread_cpu_time() returns
4066 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4067 assert(n >= 0, "negative CPU time");
4068 return n;
4069 }
4070
4071 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4072 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4073 assert(n >= 0, "negative CPU time");
4074 return n;
4075 }
4076
4077 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4078 bool error = false;
4079
4080 jlong sys_time = 0;
4081 jlong user_time = 0;
4082
4083 // Reimplemented using getthrds64().
4084 //
4085 // Works like this:
4086 // For the thread in question, get the kernel thread id. Then get the
4087 // kernel thread statistics using that id.
4088 //
4089 // This only works of course when no pthread scheduling is used,
4090 // i.e. there is a 1:1 relationship to kernel threads.
4091 // On AIX, see AIXTHREAD_SCOPE variable.
4092
4093 pthread_t pthtid = thread->osthread()->pthread_id();
4094
4095 // retrieve kernel thread id for the pthread:
4096 tid64_t tid = 0;
4097 struct __pthrdsinfo pinfo;
4098 // I just love those otherworldly IBM APIs which force me to hand down
4099 // dummy buffers for stuff I dont care for...
4100 char dummy[1];
4101 int dummy_size = sizeof(dummy);
4102 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4103 dummy, &dummy_size) == 0) {
4104 tid = pinfo.__pi_tid;
4105 } else {
4106 tty->print_cr("pthread_getthrds_np failed.");
4107 error = true;
4108 }
4109
4110 // retrieve kernel timing info for that kernel thread
4111 if (!error) {
4112 struct thrdentry64 thrdentry;
4113 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4114 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4115 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4116 } else {
4117 tty->print_cr("pthread_getthrds_np failed.");
4118 error = true;
4119 }
4120 }
4121
4122 if (p_sys_time) {
4123 *p_sys_time = sys_time;
4124 }
4125
4126 if (p_user_time) {
4127 *p_user_time = user_time;
4128 }
4129
4130 if (error) {
4131 return false;
4132 }
4133
4134 return true;
4135 }
4136
4137 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4138 jlong sys_time;
4139 jlong user_time;
4140
4141 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4142 return -1;
4143 }
4144
4145 return user_sys_cpu_time ? sys_time + user_time : user_time;
4146 }
4147
4148 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4149 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4150 info_ptr->may_skip_backward = false; // elapsed time not wall time
4151 info_ptr->may_skip_forward = false; // elapsed time not wall time
4152 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4153 }
4154
4155 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4156 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4157 info_ptr->may_skip_backward = false; // elapsed time not wall time
4158 info_ptr->may_skip_forward = false; // elapsed time not wall time
4159 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4160 }
4161
4162 bool os::is_thread_cpu_time_supported() {
4163 return true;
4164 }
4165
4166 // System loadavg support. Returns -1 if load average cannot be obtained.
4167 // For now just return the system wide load average (no processor sets).
4168 int os::loadavg(double values[], int nelem) {
4169
4170 // Implemented using libperfstat on AIX.
4171
4172 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4173 guarantee(values, "argument error");
4174
4175 if (os::Aix::on_pase()) {
4176 Unimplemented();
4177 return -1;
4178 } else {
4179 // AIX: use libperfstat
4180 //
4181 // See also:
4182 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4183 // /usr/include/libperfstat.h:
4184
4185 // Use the already AIX version independent get_cpuinfo.
4186 os::Aix::cpuinfo_t ci;
4187 if (os::Aix::get_cpuinfo(&ci)) {
4188 for (int i = 0; i < nelem; i++) {
4189 values[i] = ci.loadavg[i];
4190 }
4191 } else {
4192 return -1;
4193 }
4194 return nelem;
4195 }
4196 }
4197
4198 void os::pause() {
4199 char filename[MAX_PATH];
4200 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4201 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4202 } else {
4203 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4204 }
4205
4206 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4207 if (fd != -1) {
4208 struct stat buf;
4209 ::close(fd);
4210 while (::stat(filename, &buf) == 0) {
4211 (void)::poll(NULL, 0, 100);
4212 }
4213 } else {
4214 jio_fprintf(stderr,
4215 "Could not open pause file '%s', continuing immediately.\n", filename);
4216 }
4217 }
4218
4219 bool os::Aix::is_primordial_thread() {
4220 if (pthread_self() == (pthread_t)1) {
4221 return true;
4222 } else {
4223 return false;
4224 }
4225 }
4226
4227 // OS recognitions (PASE/AIX, OS level) call this before calling any
4228 // one of Aix::on_pase(), Aix::os_version() static
4229 void os::Aix::initialize_os_info() {
4230
4231 assert(_on_pase == -1 && _os_version == -1, "already called.");
4232
4233 struct utsname uts;
4234 memset(&uts, 0, sizeof(uts));
4235 strcpy(uts.sysname, "?");
4236 if (::uname(&uts) == -1) {
4237 trc("uname failed (%d)", errno);
4238 guarantee(0, "Could not determine whether we run on AIX or PASE");
4239 } else {
4240 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4241 "node \"%s\" machine \"%s\"\n",
4242 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4243 const int major = atoi(uts.version);
4244 assert(major > 0, "invalid OS version");
4245 const int minor = atoi(uts.release);
4246 assert(minor > 0, "invalid OS release");
4247 _os_version = (major << 8) | minor;
4248 if (strcmp(uts.sysname, "OS400") == 0) {
4249 Unimplemented();
4250 } else if (strcmp(uts.sysname, "AIX") == 0) {
4251 // We run on AIX. We do not support versions older than AIX 5.3.
4252 _on_pase = 0;
4253 if (_os_version < 0x0503) {
4254 trc("AIX release older than AIX 5.3 not supported.");
4255 assert(false, "AIX release too old.");
4256 } else {
4257 trcVerbose("We run on AIX %d.%d\n", major, minor);
4258 }
4259 } else {
4260 assert(false, "unknown OS");
4261 }
4262 }
4263
4264 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4265 } // end: os::Aix::initialize_os_info()
4266
4267 // Scan environment for important settings which might effect the VM.
4268 // Trace out settings. Warn about invalid settings and/or correct them.
4269 //
4270 // Must run after os::Aix::initialue_os_info().
4271 void os::Aix::scan_environment() {
4272
4273 char* p;
4274 int rc;
4275
4276 // Warn explicity if EXTSHM=ON is used. That switch changes how
4277 // System V shared memory behaves. One effect is that page size of
4278 // shared memory cannot be change dynamically, effectivly preventing
4279 // large pages from working.
4280 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4281 // recommendation is (in OSS notes) to switch it off.
4282 p = ::getenv("EXTSHM");
4283 if (Verbose) {
4284 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4285 }
4286 if (p && strcasecmp(p, "ON") == 0) {
4287 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4288 _extshm = 1;
4289 } else {
4290 _extshm = 0;
4291 }
4292
4293 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4294 // Not tested, not supported.
4295 //
4296 // Note that it might be worth the trouble to test and to require it, if only to
4297 // get useful return codes for mprotect.
4298 //
4299 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4300 // exec() ? before loading the libjvm ? ....)
4301 p = ::getenv("XPG_SUS_ENV");
4302 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4303 if (p && strcmp(p, "ON") == 0) {
4304 _xpg_sus_mode = 1;
4305 trc("Unsupported setting: XPG_SUS_ENV=ON");
4306 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4307 // clobber address ranges. If we ever want to support that, we have to do some
4308 // testing first.
4309 guarantee(false, "XPG_SUS_ENV=ON not supported");
4310 } else {
4311 _xpg_sus_mode = 0;
4312 }
4313
4314 // Switch off AIX internal (pthread) guard pages. This has
4315 // immediate effect for any pthread_create calls which follow.
4316 p = ::getenv("AIXTHREAD_GUARDPAGES");
4317 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4318 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4319 guarantee(rc == 0, "");
4320
4321 } // end: os::Aix::scan_environment()
4322
4323 // PASE: initialize the libo4 library (AS400 PASE porting library).
4324 void os::Aix::initialize_libo4() {
4325 Unimplemented();
4326 }
4327
4328 // AIX: initialize the libperfstat library (we load this dynamically
4329 // because it is only available on AIX.
4330 void os::Aix::initialize_libperfstat() {
4331
4332 assert(os::Aix::on_aix(), "AIX only");
4333
4334 if (!libperfstat::init()) {
4335 trc("libperfstat initialization failed.");
4336 assert(false, "libperfstat initialization failed");
4337 } else {
4338 if (Verbose) {
4339 fprintf(stderr, "libperfstat initialized.\n");
4340 }
4341 }
4342 } // end: os::Aix::initialize_libperfstat
4343
4344 /////////////////////////////////////////////////////////////////////////////
4345 // thread stack
4346
4347 // Function to query the current stack size using pthread_getthrds_np.
4348 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4349 // This only works when invoked on a pthread. As we agreed not to use
4350 // primordial threads anyway, I assert here.
4351 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4352
4353 // Information about this api can be found (a) in the pthread.h header and
4354 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4355 //
4356 // The use of this API to find out the current stack is kind of undefined.
4357 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4358 // enough for cases where I let the pthread library create its stacks. For cases
4359 // where I create an own stack and pass this to pthread_create, it seems not to
4360 // work (the returned stack size in that case is 0).
4361
4362 pthread_t tid = pthread_self();
4363 struct __pthrdsinfo pinfo;
4364 char dummy[1]; // We only need this to satisfy the api and to not get E.
4365 int dummy_size = sizeof(dummy);
4366
4367 memset(&pinfo, 0, sizeof(pinfo));
4368
4369 const int rc = pthread_getthrds_np(&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4370 sizeof(pinfo), dummy, &dummy_size);
4371
4372 if (rc != 0) {
4373 assert0(false);
4374 trcVerbose("pthread_getthrds_np failed (%d)", rc);
4375 return false;
4376 }
4377 guarantee0(pinfo.__pi_stackend);
4378
4379 // The following can happen when invoking pthread_getthrds_np on a pthread running
4380 // on a user provided stack (when handing down a stack to pthread create, see
4381 // pthread_attr_setstackaddr).
4382 // Not sure what to do here - I feel inclined to forbid this use case completely.
4383 guarantee0(pinfo.__pi_stacksize);
4384
4385 // Note: the pthread stack on AIX seems to look like this:
4386 //
4387 // --------------------- real base ? at page border ?
4388 //
4389 // pthread internal data, like ~2K, see also
4390 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/thread_supp_tun_params.htm
4391 //
4392 // --------------------- __pi_stackend - not page aligned, (xxxxF890)
4393 //
4394 // stack
4395 // ....
4396 //
4397 // stack
4398 //
4399 // --------------------- __pi_stackend - __pi_stacksize
4400 //
4401 // padding due to AIX guard pages (?) see AIXTHREAD_GUARDPAGES
4402 // --------------------- __pi_stackaddr (page aligned if AIXTHREAD_GUARDPAGES > 0)
4403 //
4404 // AIX guard pages (?)
4405 //
4406
4407 // So, the safe thing to do is to use the area from __pi_stackend to __pi_stackaddr;
4408 // __pi_stackend however is almost never page aligned.
4409 //
4410
4411 if (p_stack_base) {
4412 (*p_stack_base) = (address) (pinfo.__pi_stackend);
4413 }
4414
4415 if (p_stack_size) {
4416 (*p_stack_size) = pinfo.__pi_stackend - pinfo.__pi_stackaddr;
4417 }
4418
4419 return true;
4420 }
4421
4422 // Get the current stack base from the OS (actually, the pthread library).
4423 address os::current_stack_base() {
4424 address p;
4425 query_stack_dimensions(&p, 0);
4426 return p;
4427 }
4428
4429 // Get the current stack size from the OS (actually, the pthread library).
4430 size_t os::current_stack_size() {
4431 size_t s;
4432 query_stack_dimensions(0, &s);
4433 return s;
4434 }
4435
4436 // Refer to the comments in os_solaris.cpp park-unpark.
4437 //
4438 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4439 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4440 // For specifics regarding the bug see GLIBC BUGID 261237 :
4441 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4442 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4443 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4444 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4445 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4446 // and monitorenter when we're using 1-0 locking. All those operations may result in
4447 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4448 // of libpthread avoids the problem, but isn't practical.
4449 //
4450 // Possible remedies:
4451 //
4452 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4453 // This is palliative and probabilistic, however. If the thread is preempted
4454 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4455 // than the minimum period may have passed, and the abstime may be stale (in the
4456 // past) resultin in a hang. Using this technique reduces the odds of a hang
4457 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4458 //
4459 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4460 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4461 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4462 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4463 // thread.
4464 //
4465 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4466 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4467 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4468 // This also works well. In fact it avoids kernel-level scalability impediments
4469 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4470 // timers in a graceful fashion.
4471 //
4472 // 4. When the abstime value is in the past it appears that control returns
4473 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4474 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4475 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4476 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4477 // It may be possible to avoid reinitialization by checking the return
4478 // value from pthread_cond_timedwait(). In addition to reinitializing the
4479 // condvar we must establish the invariant that cond_signal() is only called
4480 // within critical sections protected by the adjunct mutex. This prevents
4481 // cond_signal() from "seeing" a condvar that's in the midst of being
4482 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4483 // desirable signal-after-unlock optimization that avoids futile context switching.
4484 //
4485 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4486 // structure when a condvar is used or initialized. cond_destroy() would
4487 // release the helper structure. Our reinitialize-after-timedwait fix
4488 // put excessive stress on malloc/free and locks protecting the c-heap.
4489 //
4490 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4491 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4492 // and only enabling the work-around for vulnerable environments.
4493
4494 // utility to compute the abstime argument to timedwait:
4495 // millis is the relative timeout time
4496 // abstime will be the absolute timeout time
4497 // TODO: replace compute_abstime() with unpackTime()
4498
4499 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4500 if (millis < 0) millis = 0;
4501 struct timeval now;
4502 int status = gettimeofday(&now, NULL);
4503 assert(status == 0, "gettimeofday");
4504 jlong seconds = millis / 1000;
4505 millis %= 1000;
4506 if (seconds > 50000000) { // see man cond_timedwait(3T)
4507 seconds = 50000000;
4508 }
4509 abstime->tv_sec = now.tv_sec + seconds;
4510 long usec = now.tv_usec + millis * 1000;
4511 if (usec >= 1000000) {
4512 abstime->tv_sec += 1;
4513 usec -= 1000000;
4514 }
4515 abstime->tv_nsec = usec * 1000;
4516 return abstime;
4517 }
4518
4519 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4520 // Conceptually TryPark() should be equivalent to park(0).
4521
4522 int os::PlatformEvent::TryPark() {
4523 for (;;) {
4524 const int v = _Event;
4525 guarantee ((v == 0) || (v == 1), "invariant");
4526 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4527 }
4528 }
4529
4530 void os::PlatformEvent::park() { // AKA "down()"
4531 // Invariant: Only the thread associated with the Event/PlatformEvent
4532 // may call park().
4533 // TODO: assert that _Assoc != NULL or _Assoc == Self
4534 int v;
4535 for (;;) {
4536 v = _Event;
4537 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4538 }
4539 guarantee (v >= 0, "invariant");
4540 if (v == 0) {
4541 // Do this the hard way by blocking ...
4542 int status = pthread_mutex_lock(_mutex);
4543 assert_status(status == 0, status, "mutex_lock");
4544 guarantee (_nParked == 0, "invariant");
4545 ++ _nParked;
4546 while (_Event < 0) {
4547 status = pthread_cond_wait(_cond, _mutex);
4548 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4549 }
4550 -- _nParked;
4551
4552 // In theory we could move the ST of 0 into _Event past the unlock(),
4553 // but then we'd need a MEMBAR after the ST.
4554 _Event = 0;
4555 status = pthread_mutex_unlock(_mutex);
4556 assert_status(status == 0, status, "mutex_unlock");
4557 }
4558 guarantee (_Event >= 0, "invariant");
4559 }
4560
4561 int os::PlatformEvent::park(jlong millis) {
4562 guarantee (_nParked == 0, "invariant");
4563
4564 int v;
4565 for (;;) {
4566 v = _Event;
4567 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4568 }
4569 guarantee (v >= 0, "invariant");
4570 if (v != 0) return OS_OK;
4571
4572 // We do this the hard way, by blocking the thread.
4573 // Consider enforcing a minimum timeout value.
4574 struct timespec abst;
4575 compute_abstime(&abst, millis);
4576
4577 int ret = OS_TIMEOUT;
4578 int status = pthread_mutex_lock(_mutex);
4579 assert_status(status == 0, status, "mutex_lock");
4580 guarantee (_nParked == 0, "invariant");
4581 ++_nParked;
4582
4583 // Object.wait(timo) will return because of
4584 // (a) notification
4585 // (b) timeout
4586 // (c) thread.interrupt
4587 //
4588 // Thread.interrupt and object.notify{All} both call Event::set.
4589 // That is, we treat thread.interrupt as a special case of notification.
4590 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4591 // We assume all ETIME returns are valid.
4592 //
4593 // TODO: properly differentiate simultaneous notify+interrupt.
4594 // In that case, we should propagate the notify to another waiter.
4595
4596 while (_Event < 0) {
4597 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4598 assert_status(status == 0 || status == ETIMEDOUT,
4599 status, "cond_timedwait");
4600 if (!FilterSpuriousWakeups) break; // previous semantics
4601 if (status == ETIMEDOUT) break;
4602 // We consume and ignore EINTR and spurious wakeups.
4603 }
4604 --_nParked;
4605 if (_Event >= 0) {
4606 ret = OS_OK;
4607 }
4608 _Event = 0;
4609 status = pthread_mutex_unlock(_mutex);
4610 assert_status(status == 0, status, "mutex_unlock");
4611 assert (_nParked == 0, "invariant");
4612 return ret;
4613 }
4614
4615 void os::PlatformEvent::unpark() {
4616 int v, AnyWaiters;
4617 for (;;) {
4618 v = _Event;
4619 if (v > 0) {
4620 // The LD of _Event could have reordered or be satisfied
4621 // by a read-aside from this processor's write buffer.
4622 // To avoid problems execute a barrier and then
4623 // ratify the value.
4624 OrderAccess::fence();
4625 if (_Event == v) return;
4626 continue;
4627 }
4628 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4629 }
4630 if (v < 0) {
4631 // Wait for the thread associated with the event to vacate
4632 int status = pthread_mutex_lock(_mutex);
4633 assert_status(status == 0, status, "mutex_lock");
4634 AnyWaiters = _nParked;
4635
4636 if (AnyWaiters != 0) {
4637 // We intentional signal *after* dropping the lock
4638 // to avoid a common class of futile wakeups.
4639 status = pthread_cond_signal(_cond);
4640 assert_status(status == 0, status, "cond_signal");
4641 }
4642 // Mutex should be locked for pthread_cond_signal(_cond).
4643 status = pthread_mutex_unlock(_mutex);
4644 assert_status(status == 0, status, "mutex_unlock");
4645 }
4646
4647 // Note that we signal() _after dropping the lock for "immortal" Events.
4648 // This is safe and avoids a common class of futile wakeups. In rare
4649 // circumstances this can cause a thread to return prematurely from
4650 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4651 // simply re-test the condition and re-park itself.
4652 }
4653
4654
4655 // JSR166
4656 // -------------------------------------------------------
4657
4658 //
4659 // The solaris and linux implementations of park/unpark are fairly
4660 // conservative for now, but can be improved. They currently use a
4661 // mutex/condvar pair, plus a a count.
4662 // Park decrements count if > 0, else does a condvar wait. Unpark
4663 // sets count to 1 and signals condvar. Only one thread ever waits
4664 // on the condvar. Contention seen when trying to park implies that someone
4665 // is unparking you, so don't wait. And spurious returns are fine, so there
4666 // is no need to track notifications.
4667 //
4668
4669 #define MAX_SECS 100000000
4670 //
4671 // This code is common to linux and solaris and will be moved to a
4672 // common place in dolphin.
4673 //
4674 // The passed in time value is either a relative time in nanoseconds
4675 // or an absolute time in milliseconds. Either way it has to be unpacked
4676 // into suitable seconds and nanoseconds components and stored in the
4677 // given timespec structure.
4678 // Given time is a 64-bit value and the time_t used in the timespec is only
4679 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4680 // overflow if times way in the future are given. Further on Solaris versions
4681 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4682 // number of seconds, in abstime, is less than current_time + 100,000,000.
4683 // As it will be 28 years before "now + 100000000" will overflow we can
4684 // ignore overflow and just impose a hard-limit on seconds using the value
4685 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4686 // years from "now".
4687 //
4688
4689 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4690 assert (time > 0, "convertTime");
4691
4692 struct timeval now;
4693 int status = gettimeofday(&now, NULL);
4694 assert(status == 0, "gettimeofday");
4695
4696 time_t max_secs = now.tv_sec + MAX_SECS;
4697
4698 if (isAbsolute) {
4699 jlong secs = time / 1000;
4700 if (secs > max_secs) {
4701 absTime->tv_sec = max_secs;
4702 }
4703 else {
4704 absTime->tv_sec = secs;
4705 }
4706 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4707 }
4708 else {
4709 jlong secs = time / NANOSECS_PER_SEC;
4710 if (secs >= MAX_SECS) {
4711 absTime->tv_sec = max_secs;
4712 absTime->tv_nsec = 0;
4713 }
4714 else {
4715 absTime->tv_sec = now.tv_sec + secs;
4716 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4717 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4718 absTime->tv_nsec -= NANOSECS_PER_SEC;
4719 ++absTime->tv_sec; // note: this must be <= max_secs
4720 }
4721 }
4722 }
4723 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4724 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4725 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4726 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4727 }
4728
4729 void Parker::park(bool isAbsolute, jlong time) {
4730 // Optional fast-path check:
4731 // Return immediately if a permit is available.
4732 if (_counter > 0) {
4733 _counter = 0;
4734 OrderAccess::fence();
4735 return;
4736 }
4737
4738 Thread* thread = Thread::current();
4739 assert(thread->is_Java_thread(), "Must be JavaThread");
4740 JavaThread *jt = (JavaThread *)thread;
4741
4742 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4743 // Check interrupt before trying to wait
4744 if (Thread::is_interrupted(thread, false)) {
4745 return;
4746 }
4747
4748 // Next, demultiplex/decode time arguments
4749 timespec absTime;
4750 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4751 return;
4752 }
4753 if (time > 0) {
4754 unpackTime(&absTime, isAbsolute, time);
4755 }
4756
4757 // Enter safepoint region
4758 // Beware of deadlocks such as 6317397.
4759 // The per-thread Parker:: mutex is a classic leaf-lock.
4760 // In particular a thread must never block on the Threads_lock while
4761 // holding the Parker:: mutex. If safepoints are pending both the
4762 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4763 ThreadBlockInVM tbivm(jt);
4764
4765 // Don't wait if cannot get lock since interference arises from
4766 // unblocking. Also. check interrupt before trying wait
4767 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4768 return;
4769 }
4770
4771 int status;
4772 if (_counter > 0) { // no wait needed
4773 _counter = 0;
4774 status = pthread_mutex_unlock(_mutex);
4775 assert (status == 0, "invariant");
4776 OrderAccess::fence();
4777 return;
4778 }
4779
4780 #ifdef ASSERT
4781 // Don't catch signals while blocked; let the running threads have the signals.
4782 // (This allows a debugger to break into the running thread.)
4783 sigset_t oldsigs;
4784 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4785 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4786 #endif
4787
4788 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4789 jt->set_suspend_equivalent();
4790 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4791
4792 if (time == 0) {
4793 status = pthread_cond_wait (_cond, _mutex);
4794 } else {
4795 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4796 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4797 pthread_cond_destroy (_cond);
4798 pthread_cond_init (_cond, NULL);
4799 }
4800 }
4801 assert_status(status == 0 || status == EINTR ||
4802 status == ETIME || status == ETIMEDOUT,
4803 status, "cond_timedwait");
4804
4805 #ifdef ASSERT
4806 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4807 #endif
4808
4809 _counter = 0;
4810 status = pthread_mutex_unlock(_mutex);
4811 assert_status(status == 0, status, "invariant");
4812 // If externally suspended while waiting, re-suspend
4813 if (jt->handle_special_suspend_equivalent_condition()) {
4814 jt->java_suspend_self();
4815 }
4816
4817 OrderAccess::fence();
4818 }
4819
4820 void Parker::unpark() {
4821 int s, status;
4822 status = pthread_mutex_lock(_mutex);
4823 assert (status == 0, "invariant");
4824 s = _counter;
4825 _counter = 1;
4826 if (s < 1) {
4827 if (WorkAroundNPTLTimedWaitHang) {
4828 status = pthread_cond_signal (_cond);
4829 assert (status == 0, "invariant");
4830 status = pthread_mutex_unlock(_mutex);
4831 assert (status == 0, "invariant");
4832 } else {
4833 status = pthread_mutex_unlock(_mutex);
4834 assert (status == 0, "invariant");
4835 status = pthread_cond_signal (_cond);
4836 assert (status == 0, "invariant");
4837 }
4838 } else {
4839 pthread_mutex_unlock(_mutex);
4840 assert (status == 0, "invariant");
4841 }
4842 }
4843
4844 extern char** environ;
4845
4846 // Run the specified command in a separate process. Return its exit value,
4847 // or -1 on failure (e.g. can't fork a new process).
4848 // Unlike system(), this function can be called from signal handler. It
4849 // doesn't block SIGINT et al.
4850 int os::fork_and_exec(char* cmd) {
4851 char * argv[4] = {"sh", "-c", cmd, NULL};
4852
4853 pid_t pid = fork();
4854
4855 if (pid < 0) {
4856 // fork failed
4857 return -1;
4858
4859 } else if (pid == 0) {
4860 // child process
4861
4862 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4863 execve("/usr/bin/sh", argv, environ);
4864
4865 // execve failed
4866 _exit(-1);
4867
4868 } else {
4869 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4870 // care about the actual exit code, for now.
4871
4872 int status;
4873
4874 // Wait for the child process to exit. This returns immediately if
4875 // the child has already exited. */
4876 while (waitpid(pid, &status, 0) < 0) {
4877 switch (errno) {
4878 case ECHILD: return 0;
4879 case EINTR: break;
4880 default: return -1;
4881 }
4882 }
4883
4884 if (WIFEXITED(status)) {
4885 // The child exited normally; get its exit code.
4886 return WEXITSTATUS(status);
4887 } else if (WIFSIGNALED(status)) {
4888 // The child exited because of a signal.
4889 // The best value to return is 0x80 + signal number,
4890 // because that is what all Unix shells do, and because
4891 // it allows callers to distinguish between process exit and
4892 // process death by signal.
4893 return 0x80 + WTERMSIG(status);
4894 } else {
4895 // Unknown exit code; pass it through.
4896 return status;
4897 }
4898 }
4899 return -1;
4900 }
4901
4902 // is_headless_jre()
4903 //
4904 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4905 // in order to report if we are running in a headless jre.
4906 //
4907 // Since JDK8 xawt/libmawt.so is moved into the same directory
4908 // as libawt.so, and renamed libawt_xawt.so
4909 bool os::is_headless_jre() {
4910 struct stat statbuf;
4911 char buf[MAXPATHLEN];
4912 char libmawtpath[MAXPATHLEN];
4913 const char *xawtstr = "/xawt/libmawt.so";
4914 const char *new_xawtstr = "/libawt_xawt.so";
4915
4916 char *p;
4917
4918 // Get path to libjvm.so
4919 os::jvm_path(buf, sizeof(buf));
4920
4921 // Get rid of libjvm.so
4922 p = strrchr(buf, '/');
4923 if (p == NULL) return false;
4924 else *p = '\0';
4925
4926 // Get rid of client or server
4927 p = strrchr(buf, '/');
4928 if (p == NULL) return false;
4929 else *p = '\0';
4930
4931 // check xawt/libmawt.so
4932 strcpy(libmawtpath, buf);
4933 strcat(libmawtpath, xawtstr);
4934 if (::stat(libmawtpath, &statbuf) == 0) return false;
4935
4936 // check libawt_xawt.so
4937 strcpy(libmawtpath, buf);
4938 strcat(libmawtpath, new_xawtstr);
4939 if (::stat(libmawtpath, &statbuf) == 0) return false;
4940
4941 return true;
4942 }
4943
4944 // Get the default path to the core file
4945 // Returns the length of the string
4946 int os::get_core_path(char* buffer, size_t bufferSize) {
4947 const char* p = get_current_directory(buffer, bufferSize);
4948
4949 if (p == NULL) {
4950 assert(p != NULL, "failed to get current directory");
4951 return 0;
4952 }
4953
4954 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4955 p, current_process_id());
4956
4957 return strlen(buffer);
4958 }
4959
4960 #ifndef PRODUCT
4961 void TestReserveMemorySpecial_test() {
4962 // No tests available for this platform
4963 }
4964 #endif