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