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